3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/thread.h"
29 #include "error_resilience.h"
33 #include "mpegutils.h"
34 #include "mpegvideo.h"
35 #include "mpegvideodata.h"
36 #include "mpeg4video.h"
43 /* The defines below define the number of bits that are read at once for
44 * reading vlc values. Changing these may improve speed and data cache needs
45 * be aware though that decreasing them may need the number of stages that is
46 * passed to get_vlc* to be increased. */
47 #define SPRITE_TRAJ_VLC_BITS 6
49 #define MB_TYPE_B_VLC_BITS 4
50 #define STUDIO_INTRA_BITS 9
52 static VLC dc_lum, dc_chrom;
53 static VLC sprite_trajectory;
54 static VLC mb_type_b_vlc;
55 static VLC studio_intra_tab[12];
56 static VLC studio_luma_dc;
57 static VLC studio_chroma_dc;
59 static const int mb_type_b_map[4] = {
60 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
61 MB_TYPE_L0L1 | MB_TYPE_16x16,
62 MB_TYPE_L1 | MB_TYPE_16x16,
63 MB_TYPE_L0 | MB_TYPE_16x16,
68 * @param n block index (0-3 are luma, 4-5 are chroma)
69 * @param dir the ac prediction direction
71 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
74 int16_t *ac_val, *ac_val1;
75 int8_t *const qscale_table = s->current_picture.qscale_table;
78 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
82 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
86 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
89 for (i = 1; i < 8; i++)
90 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
92 /* different qscale, we must rescale */
93 for (i = 1; i < 8; i++)
94 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
97 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
99 ac_val -= 16 * s->block_wrap[n];
101 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
104 for (i = 1; i < 8; i++)
105 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
107 /* different qscale, we must rescale */
108 for (i = 1; i < 8; i++)
109 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
114 for (i = 1; i < 8; i++)
115 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
118 for (i = 1; i < 8; i++)
119 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
123 * check if the next stuff is a resync marker or the end.
126 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
128 MpegEncContext *s = &ctx->m;
129 int bits_count = get_bits_count(&s->gb);
130 int v = show_bits(&s->gb, 16);
132 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
136 if (s->pict_type == AV_PICTURE_TYPE_B ||
137 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
139 skip_bits(&s->gb, 8 + s->pict_type);
140 bits_count += 8 + s->pict_type;
141 v = show_bits(&s->gb, 16);
144 if (bits_count + 8 >= s->gb.size_in_bits) {
146 v |= 0x7F >> (7 - (bits_count & 7));
151 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
153 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
154 GetBitContext gb = s->gb;
156 skip_bits(&s->gb, 1);
157 align_get_bits(&s->gb);
159 for (len = 0; len < 32; len++)
160 if (get_bits1(&s->gb))
163 mb_num = get_bits(&s->gb, mb_num_bits);
164 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
169 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
176 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
178 MpegEncContext *s = &ctx->m;
179 int a = 2 << s->sprite_warping_accuracy;
180 int rho = 3 - s->sprite_warping_accuracy;
186 int min_ab, i, w2, h2, w3, h3;
187 int sprite_ref[4][2];
188 int virtual_ref[2][2];
189 int64_t sprite_offset[2][2];
190 int64_t sprite_delta[2][2];
192 // only true for rectangle shapes
193 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
194 { 0, s->height }, { s->width, s->height } };
195 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
197 if (w <= 0 || h <= 0)
198 return AVERROR_INVALIDDATA;
200 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
204 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
206 x = get_xbits(gb, length);
208 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
209 check_marker(s->avctx, gb, "before sprite_trajectory");
211 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
213 y = get_xbits(gb, length);
215 check_marker(s->avctx, gb, "after sprite_trajectory");
216 ctx->sprite_traj[i][0] = d[i][0] = x;
217 ctx->sprite_traj[i][1] = d[i][1] = y;
220 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
222 while ((1 << alpha) < w)
224 while ((1 << beta) < h)
225 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
229 // Note, the 4th point isn't used for GMC
230 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
231 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
232 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
233 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
234 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
235 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
236 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
238 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
239 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
240 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
241 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
242 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
243 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
245 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
246 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
248 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
249 * because of that...). Perhaps it should be reordered to be more readable.
250 * The idea behind this virtual_ref mess is to be able to use shifts later
251 * per pixel instead of divides so the distance between points is converted
252 * from w&h based to w2&h2 based which are of the 2^x form. */
253 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
254 ROUNDED_DIV(((w - w2) *
255 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
256 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
257 virtual_ref[0][1] = 16 * vop_ref[0][1] +
258 ROUNDED_DIV(((w - w2) *
259 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
260 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
261 virtual_ref[1][0] = 16 * vop_ref[0][0] +
262 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
263 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
264 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
265 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
266 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
268 switch (ctx->num_sprite_warping_points) {
270 sprite_offset[0][0] =
271 sprite_offset[0][1] =
272 sprite_offset[1][0] =
273 sprite_offset[1][1] = 0;
274 sprite_delta[0][0] = a;
276 sprite_delta[1][0] = 0;
277 sprite_delta[1][1] = a;
278 ctx->sprite_shift[0] =
279 ctx->sprite_shift[1] = 0;
282 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
283 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
284 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
285 a * (vop_ref[0][0] / 2);
286 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
287 a * (vop_ref[0][1] / 2);
288 sprite_delta[0][0] = a;
290 sprite_delta[1][0] = 0;
291 sprite_delta[1][1] = a;
292 ctx->sprite_shift[0] =
293 ctx->sprite_shift[1] = 0;
296 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
297 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
298 ((int64_t) -vop_ref[0][0]) +
299 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
300 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
301 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
302 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
303 ((int64_t) -vop_ref[0][0]) +
304 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
305 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
306 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
307 ((int64_t)-2 * vop_ref[0][0] + 1) +
308 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
309 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
310 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
311 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
312 ((int64_t)-2 * vop_ref[0][0] + 1) +
313 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
314 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
315 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
316 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
317 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
318 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
319 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
321 ctx->sprite_shift[0] = alpha + rho;
322 ctx->sprite_shift[1] = alpha + rho + 2;
325 min_ab = FFMIN(alpha, beta);
328 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
329 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
330 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
331 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
332 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
333 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
334 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
335 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
336 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
337 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
338 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
339 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
340 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
341 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
342 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
343 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
344 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
345 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
346 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
347 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
349 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
350 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
353 /* try to simplify the situation */
354 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
355 sprite_delta[0][1] == 0 &&
356 sprite_delta[1][0] == 0 &&
357 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
358 sprite_offset[0][0] >>= ctx->sprite_shift[0];
359 sprite_offset[0][1] >>= ctx->sprite_shift[0];
360 sprite_offset[1][0] >>= ctx->sprite_shift[1];
361 sprite_offset[1][1] >>= ctx->sprite_shift[1];
362 sprite_delta[0][0] = a;
363 sprite_delta[0][1] = 0;
364 sprite_delta[1][0] = 0;
365 sprite_delta[1][1] = a;
366 ctx->sprite_shift[0] = 0;
367 ctx->sprite_shift[1] = 0;
368 s->real_sprite_warping_points = 1;
370 int shift_y = 16 - ctx->sprite_shift[0];
371 int shift_c = 16 - ctx->sprite_shift[1];
373 for (i = 0; i < 2; i++) {
374 if (shift_c < 0 || shift_y < 0 ||
375 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
376 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
377 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
378 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
380 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
385 for (i = 0; i < 2; i++) {
386 sprite_offset[0][i] *= 1 << shift_y;
387 sprite_offset[1][i] *= 1 << shift_c;
388 sprite_delta[0][i] *= 1 << shift_y;
389 sprite_delta[1][i] *= 1 << shift_y;
390 ctx->sprite_shift[i] = 16;
393 for (i = 0; i < 2; i++) {
395 sprite_delta[i][0] - a * (1LL<<16),
396 sprite_delta[i][1] - a * (1LL<<16)
399 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
400 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
401 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
402 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
403 llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404 llabs(sd[0]) >= INT_MAX ||
405 llabs(sd[1]) >= INT_MAX ||
406 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
407 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
408 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
410 avpriv_request_sample(s->avctx, "Overflow on sprite points");
414 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
417 for (i = 0; i < 4; i++) {
418 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
419 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
424 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
425 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
426 return AVERROR_PATCHWELCOME;
429 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
430 MpegEncContext *s = &ctx->m;
431 int len = FFMIN(ctx->time_increment_bits + 3, 15);
436 check_marker(s->avctx, gb, "after new_pred");
442 * Decode the next video packet.
443 * @return <0 if something went wrong
445 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
447 MpegEncContext *s = &ctx->m;
449 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
450 int header_extension = 0, mb_num, len;
452 /* is there enough space left for a video packet + header */
453 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
454 return AVERROR_INVALIDDATA;
456 for (len = 0; len < 32; len++)
457 if (get_bits1(&s->gb))
460 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
461 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
462 return AVERROR_INVALIDDATA;
465 if (ctx->shape != RECT_SHAPE) {
466 header_extension = get_bits1(&s->gb);
467 // FIXME more stuff here
470 mb_num = get_bits(&s->gb, mb_num_bits);
471 if (mb_num >= s->mb_num || !mb_num) {
472 av_log(s->avctx, AV_LOG_ERROR,
473 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
474 return AVERROR_INVALIDDATA;
477 s->mb_x = mb_num % s->mb_width;
478 s->mb_y = mb_num / s->mb_width;
480 if (ctx->shape != BIN_ONLY_SHAPE) {
481 int qscale = get_bits(&s->gb, s->quant_precision);
483 s->chroma_qscale = s->qscale = qscale;
486 if (ctx->shape == RECT_SHAPE)
487 header_extension = get_bits1(&s->gb);
489 if (header_extension) {
492 while (get_bits1(&s->gb) != 0)
495 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
496 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
497 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
499 skip_bits(&s->gb, 2); /* vop coding type */
500 // FIXME not rect stuff here
502 if (ctx->shape != BIN_ONLY_SHAPE) {
503 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
504 // FIXME don't just ignore everything
505 if (s->pict_type == AV_PICTURE_TYPE_S &&
506 ctx->vol_sprite_usage == GMC_SPRITE) {
507 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
508 return AVERROR_INVALIDDATA;
509 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
512 // FIXME reduced res stuff here
514 if (s->pict_type != AV_PICTURE_TYPE_I) {
515 int f_code = get_bits(&s->gb, 3); /* fcode_for */
517 av_log(s->avctx, AV_LOG_ERROR,
518 "Error, video packet header damaged (f_code=0)\n");
520 if (s->pict_type == AV_PICTURE_TYPE_B) {
521 int b_code = get_bits(&s->gb, 3);
523 av_log(s->avctx, AV_LOG_ERROR,
524 "Error, video packet header damaged (b_code=0)\n");
529 decode_new_pred(ctx, &s->gb);
534 static void reset_studio_dc_predictors(MpegEncContext *s)
536 /* Reset DC Predictors */
539 s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
543 * Decode the next video packet.
544 * @return <0 if something went wrong
546 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
548 MpegEncContext *s = &ctx->m;
549 GetBitContext *gb = &s->gb;
553 if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
554 vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
555 mb_num = get_bits(gb, vlc_len);
557 if (mb_num >= s->mb_num)
558 return AVERROR_INVALIDDATA;
560 s->mb_x = mb_num % s->mb_width;
561 s->mb_y = mb_num / s->mb_width;
563 if (ctx->shape != BIN_ONLY_SHAPE)
564 s->qscale = mpeg_get_qscale(s);
566 if (get_bits1(gb)) { /* slice_extension_flag */
567 skip_bits1(gb); /* intra_slice */
568 skip_bits1(gb); /* slice_VOP_id_enable */
569 skip_bits(gb, 6); /* slice_VOP_id */
570 while (get_bits1(gb)) /* extra_bit_slice */
571 skip_bits(gb, 8); /* extra_information_slice */
574 reset_studio_dc_predictors(s);
577 return AVERROR_INVALIDDATA;
584 * Get the average motion vector for a GMC MB.
585 * @param n either 0 for the x component or 1 for y
586 * @return the average MV for a GMC MB
588 static inline int get_amv(Mpeg4DecContext *ctx, int n)
590 MpegEncContext *s = &ctx->m;
591 int x, y, mb_v, sum, dx, dy, shift;
592 int len = 1 << (s->f_code + 4);
593 const int a = s->sprite_warping_accuracy;
595 if (s->workaround_bugs & FF_BUG_AMV)
596 len >>= s->quarter_sample;
598 if (s->real_sprite_warping_points == 1) {
599 if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
600 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
602 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
604 dx = s->sprite_delta[n][0];
605 dy = s->sprite_delta[n][1];
606 shift = ctx->sprite_shift[0];
608 dy -= 1 << (shift + a + 1);
610 dx -= 1 << (shift + a + 1);
611 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
614 for (y = 0; y < 16; y++) {
619 for (x = 0; x < 16; x++) {
624 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
636 * Decode the dc value.
637 * @param n block index (0-3 are luma, 4-5 are chroma)
638 * @param dir_ptr the prediction direction will be stored here
639 * @return the quantized dc
641 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
646 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
648 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
650 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
651 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
652 return AVERROR_INVALIDDATA;
660 level = 2 * get_bits1(&s->gb) - 1;
662 if (get_bits1(&s->gb))
663 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
665 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
668 level = get_xbits(&s->gb, code);
672 if (get_bits1(&s->gb) == 0) { /* marker */
673 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
674 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
675 return AVERROR_INVALIDDATA;
681 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
685 * Decode first partition.
686 * @return number of MBs decoded or <0 if an error occurred
688 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
690 MpegEncContext *s = &ctx->m;
692 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
694 /* decode first partition */
695 s->first_slice_line = 1;
696 for (; s->mb_y < s->mb_height; s->mb_y++) {
697 ff_init_block_index(s);
698 for (; s->mb_x < s->mb_width; s->mb_x++) {
699 const int xy = s->mb_x + s->mb_y * s->mb_stride;
704 ff_update_block_index(s);
705 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
706 s->first_slice_line = 0;
708 if (s->pict_type == AV_PICTURE_TYPE_I) {
712 if (show_bits(&s->gb, 19) == DC_MARKER)
715 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
717 av_log(s->avctx, AV_LOG_ERROR,
718 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
719 return AVERROR_INVALIDDATA;
723 s->cbp_table[xy] = cbpc & 3;
724 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
728 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
730 s->current_picture.qscale_table[xy] = s->qscale;
732 s->mbintra_table[xy] = 1;
733 for (i = 0; i < 6; i++) {
735 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
737 av_log(s->avctx, AV_LOG_ERROR,
738 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
745 s->pred_dir_table[xy] = dir;
746 } else { /* P/S_TYPE */
747 int mx, my, pred_x, pred_y, bits;
748 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
749 const int stride = s->b8_stride * 2;
752 bits = show_bits(&s->gb, 17);
753 if (bits == MOTION_MARKER)
757 if (bits & 0x10000) {
759 if (s->pict_type == AV_PICTURE_TYPE_S &&
760 ctx->vol_sprite_usage == GMC_SPRITE) {
761 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
765 mx = get_amv(ctx, 0);
766 my = get_amv(ctx, 1);
768 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
775 mot_val[0 + stride] =
776 mot_val[2 + stride] = mx;
779 mot_val[1 + stride] =
780 mot_val[3 + stride] = my;
782 if (s->mbintra_table[xy])
783 ff_clean_intra_table_entries(s);
787 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
789 av_log(s->avctx, AV_LOG_ERROR,
790 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
791 return AVERROR_INVALIDDATA;
796 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
798 s->mb_intra = ((cbpc & 4) != 0);
801 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
802 s->mbintra_table[xy] = 1;
805 mot_val[0 + stride] =
806 mot_val[2 + stride] = 0;
809 mot_val[1 + stride] =
810 mot_val[3 + stride] = 0;
812 if (s->mbintra_table[xy])
813 ff_clean_intra_table_entries(s);
815 if (s->pict_type == AV_PICTURE_TYPE_S &&
816 ctx->vol_sprite_usage == GMC_SPRITE &&
818 s->mcsel = get_bits1(&s->gb);
822 if ((cbpc & 16) == 0) {
823 /* 16x16 motion prediction */
825 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
827 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
829 return AVERROR_INVALIDDATA;
831 my = ff_h263_decode_motion(s, pred_y, s->f_code);
833 return AVERROR_INVALIDDATA;
834 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
837 mx = get_amv(ctx, 0);
838 my = get_amv(ctx, 1);
839 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
846 mot_val[0 + stride] =
847 mot_val[2 + stride] = mx;
850 mot_val[1 + stride] =
851 mot_val[3 + stride] = my;
854 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
856 for (i = 0; i < 4; i++) {
857 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
858 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
860 return AVERROR_INVALIDDATA;
862 my = ff_h263_decode_motion(s, pred_y, s->f_code);
864 return AVERROR_INVALIDDATA;
879 * decode second partition.
880 * @return <0 if an error occurred
882 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
885 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
887 s->mb_x = s->resync_mb_x;
888 s->first_slice_line = 1;
889 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
890 ff_init_block_index(s);
891 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
892 const int xy = s->mb_x + s->mb_y * s->mb_stride;
895 ff_update_block_index(s);
896 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
897 s->first_slice_line = 0;
899 if (s->pict_type == AV_PICTURE_TYPE_I) {
900 int ac_pred = get_bits1(&s->gb);
901 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
903 av_log(s->avctx, AV_LOG_ERROR,
904 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
905 return AVERROR_INVALIDDATA;
908 s->cbp_table[xy] |= cbpy << 2;
909 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
910 } else { /* P || S_TYPE */
911 if (IS_INTRA(s->current_picture.mb_type[xy])) {
914 int ac_pred = get_bits1(&s->gb);
915 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
918 av_log(s->avctx, AV_LOG_ERROR,
919 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
920 return AVERROR_INVALIDDATA;
923 if (s->cbp_table[xy] & 8)
924 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
925 s->current_picture.qscale_table[xy] = s->qscale;
927 for (i = 0; i < 6; i++) {
929 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
931 av_log(s->avctx, AV_LOG_ERROR,
932 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
939 s->cbp_table[xy] &= 3; // remove dquant
940 s->cbp_table[xy] |= cbpy << 2;
941 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
942 s->pred_dir_table[xy] = dir;
943 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
944 s->current_picture.qscale_table[xy] = s->qscale;
945 s->cbp_table[xy] = 0;
947 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
950 av_log(s->avctx, AV_LOG_ERROR,
951 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
952 return AVERROR_INVALIDDATA;
955 if (s->cbp_table[xy] & 8)
956 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
957 s->current_picture.qscale_table[xy] = s->qscale;
959 s->cbp_table[xy] &= 3; // remove dquant
960 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
964 if (mb_num >= mb_count)
972 * Decode the first and second partition.
973 * @return <0 if error (and sets error type in the error_status_table)
975 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
977 MpegEncContext *s = &ctx->m;
980 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
981 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
983 mb_num = mpeg4_decode_partition_a(ctx);
985 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
986 s->mb_x, s->mb_y, part_a_error);
987 return mb_num ? mb_num : AVERROR_INVALIDDATA;
990 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
991 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
992 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
993 s->mb_x, s->mb_y, part_a_error);
994 return AVERROR_INVALIDDATA;
997 s->mb_num_left = mb_num;
999 if (s->pict_type == AV_PICTURE_TYPE_I) {
1000 while (show_bits(&s->gb, 9) == 1)
1001 skip_bits(&s->gb, 9);
1002 if (get_bits(&s->gb, 19) != DC_MARKER) {
1003 av_log(s->avctx, AV_LOG_ERROR,
1004 "marker missing after first I partition at %d %d\n",
1006 return AVERROR_INVALIDDATA;
1009 while (show_bits(&s->gb, 10) == 1)
1010 skip_bits(&s->gb, 10);
1011 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1012 av_log(s->avctx, AV_LOG_ERROR,
1013 "marker missing after first P partition at %d %d\n",
1015 return AVERROR_INVALIDDATA;
1018 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1019 s->mb_x - 1, s->mb_y, part_a_end);
1021 ret = mpeg4_decode_partition_b(s, mb_num);
1023 if (s->pict_type == AV_PICTURE_TYPE_P)
1024 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1025 s->mb_x, s->mb_y, ER_DC_ERROR);
1028 if (s->pict_type == AV_PICTURE_TYPE_P)
1029 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1030 s->mb_x - 1, s->mb_y, ER_DC_END);
1038 * @return <0 if an error occurred
1040 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1041 int n, int coded, int intra, int rvlc)
1043 MpegEncContext *s = &ctx->m;
1044 int level, i, last, run, qmul, qadd;
1045 int av_uninit(dc_pred_dir);
1047 RL_VLC_ELEM *rl_vlc;
1048 const uint8_t *scan_table;
1050 // Note intra & rvlc should be optimized away if this is inlined
1053 if (ctx->use_intra_dc_vlc) {
1055 if (s->partitioned_frame) {
1056 level = s->dc_val[0][s->block_index[n]];
1058 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1060 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1061 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1063 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1071 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1077 rl = &ff_rvlc_rl_intra;
1078 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1080 rl = &ff_mpeg4_rl_intra;
1081 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1084 if (dc_pred_dir == 0)
1085 scan_table = s->intra_v_scantable.permutated; /* left */
1087 scan_table = s->intra_h_scantable.permutated; /* top */
1089 scan_table = s->intra_scantable.permutated;
1096 s->block_last_index[n] = i;
1100 rl = &ff_rvlc_rl_inter;
1102 rl = &ff_h263_rl_inter;
1104 scan_table = s->intra_scantable.permutated;
1106 if (s->mpeg_quant) {
1110 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1112 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1114 qmul = s->qscale << 1;
1115 qadd = (s->qscale - 1) | 1;
1117 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1119 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1123 OPEN_READER(re, &s->gb);
1125 UPDATE_CACHE(re, &s->gb);
1126 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1130 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1131 av_log(s->avctx, AV_LOG_ERROR,
1132 "1. marker bit missing in rvlc esc\n");
1133 return AVERROR_INVALIDDATA;
1135 SKIP_CACHE(re, &s->gb, 1);
1137 last = SHOW_UBITS(re, &s->gb, 1);
1138 SKIP_CACHE(re, &s->gb, 1);
1139 run = SHOW_UBITS(re, &s->gb, 6);
1140 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1141 UPDATE_CACHE(re, &s->gb);
1143 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1144 av_log(s->avctx, AV_LOG_ERROR,
1145 "2. marker bit missing in rvlc esc\n");
1146 return AVERROR_INVALIDDATA;
1148 SKIP_CACHE(re, &s->gb, 1);
1150 level = SHOW_UBITS(re, &s->gb, 11);
1151 SKIP_CACHE(re, &s->gb, 11);
1153 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1154 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1155 return AVERROR_INVALIDDATA;
1157 SKIP_CACHE(re, &s->gb, 5);
1159 level = level * qmul + qadd;
1160 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1161 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1168 cache = GET_CACHE(re, &s->gb);
1171 cache ^= 0xC0000000;
1173 if (cache & 0x80000000) {
1174 if (cache & 0x40000000) {
1176 SKIP_CACHE(re, &s->gb, 2);
1177 last = SHOW_UBITS(re, &s->gb, 1);
1178 SKIP_CACHE(re, &s->gb, 1);
1179 run = SHOW_UBITS(re, &s->gb, 6);
1180 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1181 UPDATE_CACHE(re, &s->gb);
1184 level = SHOW_SBITS(re, &s->gb, 12);
1185 LAST_SKIP_BITS(re, &s->gb, 12);
1187 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1188 av_log(s->avctx, AV_LOG_ERROR,
1189 "1. marker bit missing in 3. esc\n");
1190 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1191 return AVERROR_INVALIDDATA;
1193 SKIP_CACHE(re, &s->gb, 1);
1195 level = SHOW_SBITS(re, &s->gb, 12);
1196 SKIP_CACHE(re, &s->gb, 12);
1198 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1199 av_log(s->avctx, AV_LOG_ERROR,
1200 "2. marker bit missing in 3. esc\n");
1201 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1202 return AVERROR_INVALIDDATA;
1205 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1209 if (s->error_recognition >= FF_ER_COMPLIANT) {
1210 const int abs_level= FFABS(level);
1211 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1212 const int run1= run - rl->max_run[last][abs_level] - 1;
1213 if (abs_level <= rl->max_level[last][run]) {
1214 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1215 return AVERROR_INVALIDDATA;
1217 if (s->error_recognition > FF_ER_COMPLIANT) {
1218 if (abs_level <= rl->max_level[last][run]*2) {
1219 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1220 return AVERROR_INVALIDDATA;
1222 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1223 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1224 return AVERROR_INVALIDDATA;
1231 level = level * qmul + qadd;
1233 level = level * qmul - qadd;
1235 if ((unsigned)(level + 2048) > 4095) {
1236 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1237 if (level > 2560 || level < -2560) {
1238 av_log(s->avctx, AV_LOG_ERROR,
1239 "|level| overflow in 3. esc, qp=%d\n",
1241 return AVERROR_INVALIDDATA;
1244 level = level < 0 ? -2048 : 2047;
1252 SKIP_BITS(re, &s->gb, 2);
1253 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1254 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1255 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1256 LAST_SKIP_BITS(re, &s->gb, 1);
1260 SKIP_BITS(re, &s->gb, 1);
1261 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1263 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1264 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1265 LAST_SKIP_BITS(re, &s->gb, 1);
1270 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1271 LAST_SKIP_BITS(re, &s->gb, 1);
1273 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1277 av_log(s->avctx, AV_LOG_ERROR,
1278 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1279 return AVERROR_INVALIDDATA;
1282 block[scan_table[i]] = level;
1286 block[scan_table[i]] = level;
1288 CLOSE_READER(re, &s->gb);
1293 if (!ctx->use_intra_dc_vlc) {
1294 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1296 i -= i >> 31; // if (i == -1) i = 0;
1299 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1301 i = 63; // FIXME not optimal
1303 s->block_last_index[n] = i;
1308 * decode partition C of one MB.
1309 * @return <0 if an error occurred
1311 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1313 Mpeg4DecContext *ctx = s->avctx->priv_data;
1315 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1317 av_assert2(s == (void*)ctx);
1319 mb_type = s->current_picture.mb_type[xy];
1320 cbp = s->cbp_table[xy];
1322 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1324 if (s->current_picture.qscale_table[xy] != s->qscale)
1325 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1327 if (s->pict_type == AV_PICTURE_TYPE_P ||
1328 s->pict_type == AV_PICTURE_TYPE_S) {
1330 for (i = 0; i < 4; i++) {
1331 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1332 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1334 s->mb_intra = IS_INTRA(mb_type);
1336 if (IS_SKIP(mb_type)) {
1338 for (i = 0; i < 6; i++)
1339 s->block_last_index[i] = -1;
1340 s->mv_dir = MV_DIR_FORWARD;
1341 s->mv_type = MV_TYPE_16X16;
1342 if (s->pict_type == AV_PICTURE_TYPE_S
1343 && ctx->vol_sprite_usage == GMC_SPRITE) {
1350 } else if (s->mb_intra) {
1351 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1352 } else if (!s->mb_intra) {
1353 // s->mcsel = 0; // FIXME do we need to init that?
1355 s->mv_dir = MV_DIR_FORWARD;
1356 if (IS_8X8(mb_type)) {
1357 s->mv_type = MV_TYPE_8X8;
1359 s->mv_type = MV_TYPE_16X16;
1362 } else { /* I-Frame */
1364 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1367 if (!IS_SKIP(mb_type)) {
1369 s->bdsp.clear_blocks(s->block[0]);
1370 /* decode each block */
1371 for (i = 0; i < 6; i++) {
1372 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1373 av_log(s->avctx, AV_LOG_ERROR,
1374 "texture corrupted at %d %d %d\n",
1375 s->mb_x, s->mb_y, s->mb_intra);
1376 return AVERROR_INVALIDDATA;
1382 /* per-MB end of slice check */
1383 if (--s->mb_num_left <= 0) {
1384 if (mpeg4_is_resync(ctx))
1389 if (mpeg4_is_resync(ctx)) {
1390 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1391 if (s->cbp_table[xy + delta])
1398 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1400 Mpeg4DecContext *ctx = s->avctx->priv_data;
1401 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1403 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1404 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1406 av_assert2(s == (void*)ctx);
1407 av_assert2(s->h263_pred);
1409 if (s->pict_type == AV_PICTURE_TYPE_P ||
1410 s->pict_type == AV_PICTURE_TYPE_S) {
1412 if (get_bits1(&s->gb)) {
1415 for (i = 0; i < 6; i++)
1416 s->block_last_index[i] = -1;
1417 s->mv_dir = MV_DIR_FORWARD;
1418 s->mv_type = MV_TYPE_16X16;
1419 if (s->pict_type == AV_PICTURE_TYPE_S &&
1420 ctx->vol_sprite_usage == GMC_SPRITE) {
1421 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1426 s->mv[0][0][0] = get_amv(ctx, 0);
1427 s->mv[0][0][1] = get_amv(ctx, 1);
1430 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1440 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1442 av_log(s->avctx, AV_LOG_ERROR,
1443 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1444 return AVERROR_INVALIDDATA;
1446 } while (cbpc == 20);
1448 s->bdsp.clear_blocks(s->block[0]);
1450 s->mb_intra = ((cbpc & 4) != 0);
1454 if (s->pict_type == AV_PICTURE_TYPE_S &&
1455 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1456 s->mcsel = get_bits1(&s->gb);
1459 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1461 av_log(s->avctx, AV_LOG_ERROR,
1462 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1463 return AVERROR_INVALIDDATA;
1466 cbp = (cbpc & 3) | (cbpy << 2);
1468 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1469 if ((!s->progressive_sequence) &&
1470 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1471 s->interlaced_dct = get_bits1(&s->gb);
1473 s->mv_dir = MV_DIR_FORWARD;
1474 if ((cbpc & 16) == 0) {
1476 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1479 /* 16x16 global motion prediction */
1480 s->mv_type = MV_TYPE_16X16;
1481 mx = get_amv(ctx, 0);
1482 my = get_amv(ctx, 1);
1483 s->mv[0][0][0] = mx;
1484 s->mv[0][0][1] = my;
1485 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1486 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1489 /* 16x8 field motion prediction */
1490 s->mv_type = MV_TYPE_FIELD;
1492 s->field_select[0][0] = get_bits1(&s->gb);
1493 s->field_select[0][1] = get_bits1(&s->gb);
1495 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1497 for (i = 0; i < 2; i++) {
1498 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1500 return AVERROR_INVALIDDATA;
1502 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1504 return AVERROR_INVALIDDATA;
1506 s->mv[0][i][0] = mx;
1507 s->mv[0][i][1] = my;
1510 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1511 /* 16x16 motion prediction */
1512 s->mv_type = MV_TYPE_16X16;
1513 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1514 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1517 return AVERROR_INVALIDDATA;
1519 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1522 return AVERROR_INVALIDDATA;
1523 s->mv[0][0][0] = mx;
1524 s->mv[0][0][1] = my;
1527 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1528 s->mv_type = MV_TYPE_8X8;
1529 for (i = 0; i < 4; i++) {
1530 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1531 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1533 return AVERROR_INVALIDDATA;
1535 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1537 return AVERROR_INVALIDDATA;
1538 s->mv[0][i][0] = mx;
1539 s->mv[0][i][1] = my;
1544 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1545 int modb1; // first bit of modb
1546 int modb2; // second bit of modb
1549 s->mb_intra = 0; // B-frames never contain intra blocks
1550 s->mcsel = 0; // ... true gmc blocks
1553 for (i = 0; i < 2; i++) {
1554 s->last_mv[i][0][0] =
1555 s->last_mv[i][0][1] =
1556 s->last_mv[i][1][0] =
1557 s->last_mv[i][1][1] = 0;
1560 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1563 /* if we skipped it in the future P-frame than skip it now too */
1564 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1566 if (s->mb_skipped) {
1568 for (i = 0; i < 6; i++)
1569 s->block_last_index[i] = -1;
1571 s->mv_dir = MV_DIR_FORWARD;
1572 s->mv_type = MV_TYPE_16X16;
1577 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1583 modb1 = get_bits1(&s->gb);
1585 // like MB_TYPE_B_DIRECT but no vectors coded
1586 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1589 modb2 = get_bits1(&s->gb);
1590 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1592 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1593 return AVERROR_INVALIDDATA;
1595 mb_type = mb_type_b_map[mb_type];
1599 s->bdsp.clear_blocks(s->block[0]);
1600 cbp = get_bits(&s->gb, 6);
1603 if ((!IS_DIRECT(mb_type)) && cbp) {
1604 if (get_bits1(&s->gb))
1605 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1608 if (!s->progressive_sequence) {
1610 s->interlaced_dct = get_bits1(&s->gb);
1612 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1613 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1614 mb_type &= ~MB_TYPE_16x16;
1616 if (USES_LIST(mb_type, 0)) {
1617 s->field_select[0][0] = get_bits1(&s->gb);
1618 s->field_select[0][1] = get_bits1(&s->gb);
1620 if (USES_LIST(mb_type, 1)) {
1621 s->field_select[1][0] = get_bits1(&s->gb);
1622 s->field_select[1][1] = get_bits1(&s->gb);
1628 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1629 s->mv_type = MV_TYPE_16X16;
1631 if (USES_LIST(mb_type, 0)) {
1632 s->mv_dir = MV_DIR_FORWARD;
1634 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1635 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1636 s->last_mv[0][1][0] =
1637 s->last_mv[0][0][0] =
1638 s->mv[0][0][0] = mx;
1639 s->last_mv[0][1][1] =
1640 s->last_mv[0][0][1] =
1641 s->mv[0][0][1] = my;
1644 if (USES_LIST(mb_type, 1)) {
1645 s->mv_dir |= MV_DIR_BACKWARD;
1647 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1648 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1649 s->last_mv[1][1][0] =
1650 s->last_mv[1][0][0] =
1651 s->mv[1][0][0] = mx;
1652 s->last_mv[1][1][1] =
1653 s->last_mv[1][0][1] =
1654 s->mv[1][0][1] = my;
1656 } else if (!IS_DIRECT(mb_type)) {
1657 s->mv_type = MV_TYPE_FIELD;
1659 if (USES_LIST(mb_type, 0)) {
1660 s->mv_dir = MV_DIR_FORWARD;
1662 for (i = 0; i < 2; i++) {
1663 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1664 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1665 s->last_mv[0][i][0] =
1666 s->mv[0][i][0] = mx;
1667 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1671 if (USES_LIST(mb_type, 1)) {
1672 s->mv_dir |= MV_DIR_BACKWARD;
1674 for (i = 0; i < 2; i++) {
1675 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1676 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1677 s->last_mv[1][i][0] =
1678 s->mv[1][i][0] = mx;
1679 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1685 if (IS_DIRECT(mb_type)) {
1686 if (IS_SKIP(mb_type)) {
1690 mx = ff_h263_decode_motion(s, 0, 1);
1691 my = ff_h263_decode_motion(s, 0, 1);
1694 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1695 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1697 s->current_picture.mb_type[xy] = mb_type;
1698 } else { /* I-Frame */
1700 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1702 av_log(s->avctx, AV_LOG_ERROR,
1703 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1704 return AVERROR_INVALIDDATA;
1706 } while (cbpc == 8);
1712 s->ac_pred = get_bits1(&s->gb);
1714 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1716 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1718 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1720 av_log(s->avctx, AV_LOG_ERROR,
1721 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1722 return AVERROR_INVALIDDATA;
1724 cbp = (cbpc & 3) | (cbpy << 2);
1726 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1729 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1731 if (!s->progressive_sequence)
1732 s->interlaced_dct = get_bits1(&s->gb);
1734 s->bdsp.clear_blocks(s->block[0]);
1735 /* decode each block */
1736 for (i = 0; i < 6; i++) {
1737 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1738 return AVERROR_INVALIDDATA;
1744 /* decode each block */
1745 for (i = 0; i < 6; i++) {
1746 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1747 return AVERROR_INVALIDDATA;
1752 /* per-MB end of slice check */
1753 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1754 int next = mpeg4_is_resync(ctx);
1756 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1757 return AVERROR_INVALIDDATA;
1758 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1761 if (s->pict_type == AV_PICTURE_TYPE_B) {
1762 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1763 ff_thread_await_progress(&s->next_picture_ptr->tf,
1764 (s->mb_x + delta >= s->mb_width)
1765 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1767 if (s->next_picture.mbskip_table[xy + delta])
1778 /* As per spec, studio start code search isn't the same as the old type of start code */
1779 static void next_start_code_studio(GetBitContext *gb)
1783 while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
1788 /* additional_code, vlc index */
1789 static const uint8_t ac_state_tab[22][2] =
1815 static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
1817 Mpeg4DecContext *ctx = s->avctx->priv_data;
1819 int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1820 additional_code_len, sign, mismatch;
1821 const VLC *cur_vlc = &studio_intra_tab[0];
1822 uint8_t *const scantable = s->intra_scantable.permutated;
1823 const uint16_t *quant_matrix;
1825 const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1826 const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1827 int shift = 3 - s->dct_precision;
1831 memset(block, 0, 64 * sizeof(int32_t));
1835 dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1836 quant_matrix = s->intra_matrix;
1840 dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1842 dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1843 quant_matrix = s->chroma_intra_matrix;
1846 if (dct_dc_size == 0) {
1849 dct_diff = get_xbits(&s->gb, dct_dc_size);
1851 if (dct_dc_size > 8) {
1852 if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1853 return AVERROR_INVALIDDATA;
1858 s->last_dc[cc] += dct_diff;
1861 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1863 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1864 /* TODO: support mpeg_quant for AC coefficients */
1866 block[0] = av_clip(block[0], min, max);
1867 mismatch ^= block[0];
1869 /* AC Coefficients */
1871 group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1874 av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1875 return AVERROR_INVALIDDATA;
1878 additional_code_len = ac_state_tab[group][0];
1879 cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
1884 } else if (group >= 1 && group <= 6) {
1885 /* Zero run length (Table B.47) */
1886 run = 1 << additional_code_len;
1887 if (additional_code_len)
1888 run += get_bits(&s->gb, additional_code_len);
1891 } else if (group >= 7 && group <= 12) {
1892 /* Zero run length and +/-1 level (Table B.48) */
1893 code = get_bits(&s->gb, additional_code_len);
1896 run = (1 << (additional_code_len - 1)) + code;
1899 return AVERROR_INVALIDDATA;
1900 j = scantable[idx++];
1901 block[j] = sign ? 1 : -1;
1902 } else if (group >= 13 && group <= 20) {
1903 /* Level value (Table B.49) */
1905 return AVERROR_INVALIDDATA;
1906 j = scantable[idx++];
1907 block[j] = get_xbits(&s->gb, additional_code_len);
1908 } else if (group == 21) {
1911 return AVERROR_INVALIDDATA;
1912 j = scantable[idx++];
1913 additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1914 flc = get_bits(&s->gb, additional_code_len);
1915 if (flc >> (additional_code_len-1))
1916 block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1920 block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1921 block[j] = av_clip(block[j], min, max);
1922 mismatch ^= block[j];
1925 block[63] ^= mismatch & 1;
1930 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1932 int i, j, w, h, idx = 0;
1933 int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1934 dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1935 h = 16 >> (n ? s->chroma_y_shift : 0);
1936 w = 16 >> (n ? s->chroma_x_shift : 0);
1938 block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1939 if (block_mean == 0){
1940 av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1941 return AVERROR_INVALIDDATA;
1943 s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1945 rice_parameter = get_bits(&s->gb, 4);
1946 if (rice_parameter == 0) {
1947 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1948 return AVERROR_INVALIDDATA;
1951 if (rice_parameter == 15)
1954 if (rice_parameter > 11) {
1955 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1956 return AVERROR_INVALIDDATA;
1959 for (i = 0; i < h; i++) {
1960 output = 1 << (s->avctx->bits_per_raw_sample - 1);
1961 top = 1 << (s->avctx->bits_per_raw_sample - 1);
1963 for (j = 0; j < w; j++) {
1967 rice_prefix_code = get_unary(&s->gb, 1, 12);
1970 if (rice_prefix_code == 11)
1971 dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1973 if (rice_prefix_code == 12) {
1974 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1975 return AVERROR_INVALIDDATA;
1977 rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1978 dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1981 /* Map to a signed residual */
1982 if (dpcm_residual & 1)
1983 dpcm_residual = (-1 * dpcm_residual) >> 1;
1985 dpcm_residual = (dpcm_residual >> 1);
1988 top = macroblock[idx-w];
1990 p = left + top - topleft;
1991 min_left_top = FFMIN(left, top);
1992 if (p < min_left_top)
1995 max_left_top = FFMAX(left, top);
1996 if (p > max_left_top)
1999 p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2004 dpcm_residual *= -1;
2006 macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2013 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2017 s->dpcm_direction = 0;
2019 /* StudioMacroblock */
2022 if (get_bits1(&s->gb)) { /* compression_mode */
2024 /* macroblock_type, 1 or 2-bit VLC */
2025 if (!get_bits1(&s->gb)) {
2027 s->qscale = mpeg_get_qscale(s);
2030 for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2031 if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2032 return AVERROR_INVALIDDATA;
2036 check_marker(s->avctx, &s->gb, "DPCM block start");
2037 s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2038 for (i = 0; i < 3; i++) {
2039 if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2040 return AVERROR_INVALIDDATA;
2044 if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2045 next_start_code_studio(&s->gb);
2049 //vcon-stp9L1.bits (first frame)
2050 if (get_bits_left(&s->gb) == 0)
2053 //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2054 if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2060 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2062 int hours, minutes, seconds;
2064 if (!show_bits(gb, 23)) {
2065 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2066 return AVERROR_INVALIDDATA;
2069 hours = get_bits(gb, 5);
2070 minutes = get_bits(gb, 6);
2071 check_marker(s->avctx, gb, "in gop_header");
2072 seconds = get_bits(gb, 6);
2074 s->time_base = seconds + 60*(minutes + 60*hours);
2082 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2085 *profile = get_bits(gb, 4);
2086 *level = get_bits(gb, 4);
2088 // for Simple profile, level 0
2089 if (*profile == 0 && *level == 8) {
2096 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2098 int visual_object_type;
2099 int is_visual_object_identifier = get_bits1(gb);
2101 if (is_visual_object_identifier) {
2104 visual_object_type = get_bits(gb, 4);
2106 if (visual_object_type == VOT_VIDEO_ID ||
2107 visual_object_type == VOT_STILL_TEXTURE_ID) {
2108 int video_signal_type = get_bits1(gb);
2109 if (video_signal_type) {
2110 int video_range, color_description;
2111 skip_bits(gb, 3); // video_format
2112 video_range = get_bits1(gb);
2113 color_description = get_bits1(gb);
2115 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2117 if (color_description) {
2118 s->avctx->color_primaries = get_bits(gb, 8);
2119 s->avctx->color_trc = get_bits(gb, 8);
2120 s->avctx->colorspace = get_bits(gb, 8);
2128 static void mpeg4_load_default_matrices(MpegEncContext *s)
2132 /* load default matrices */
2133 for (i = 0; i < 64; i++) {
2134 int j = s->idsp.idct_permutation[i];
2135 v = ff_mpeg4_default_intra_matrix[i];
2136 s->intra_matrix[j] = v;
2137 s->chroma_intra_matrix[j] = v;
2139 v = ff_mpeg4_default_non_intra_matrix[i];
2140 s->inter_matrix[j] = v;
2141 s->chroma_inter_matrix[j] = v;
2145 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2149 if (get_bits1(gb)) {
2150 if (get_bits_left(gb) < 64*8)
2151 return AVERROR_INVALIDDATA;
2152 /* intra_quantiser_matrix */
2153 for (i = 0; i < 64; i++) {
2154 v = get_bits(gb, 8);
2155 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2156 s->intra_matrix[j] = v;
2157 s->chroma_intra_matrix[j] = v;
2161 if (get_bits1(gb)) {
2162 if (get_bits_left(gb) < 64*8)
2163 return AVERROR_INVALIDDATA;
2164 /* non_intra_quantiser_matrix */
2165 for (i = 0; i < 64; i++) {
2170 if (get_bits1(gb)) {
2171 if (get_bits_left(gb) < 64*8)
2172 return AVERROR_INVALIDDATA;
2173 /* chroma_intra_quantiser_matrix */
2174 for (i = 0; i < 64; i++) {
2175 v = get_bits(gb, 8);
2176 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2177 s->chroma_intra_matrix[j] = v;
2181 if (get_bits1(gb)) {
2182 if (get_bits_left(gb) < 64*8)
2183 return AVERROR_INVALIDDATA;
2184 /* chroma_non_intra_quantiser_matrix */
2185 for (i = 0; i < 64; i++) {
2190 next_start_code_studio(gb);
2194 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
2197 uint8_t extension_type;
2199 startcode = show_bits_long(gb, 32);
2200 if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
2202 if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
2203 skip_bits_long(gb, 32);
2204 extension_type = get_bits(gb, 4);
2205 if (extension_type == QUANT_MATRIX_EXT_ID)
2206 read_quant_matrix_ext(s, gb);
2211 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2213 MpegEncContext *s = &ctx->m;
2215 int bits_per_raw_sample;
2216 int rgb, chroma_format;
2218 // random_accessible_vol and video_object_type_indication have already
2219 // been read by the caller decode_vol_header()
2220 skip_bits(gb, 4); /* video_object_layer_verid */
2221 ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
2222 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2223 skip_bits1(gb); /* progressive_sequence */
2224 if (ctx->shape != RECT_SHAPE) {
2225 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
2226 return AVERROR_PATCHWELCOME;
2228 if (ctx->shape != BIN_ONLY_SHAPE) {
2229 rgb = get_bits1(gb); /* rgb_components */
2230 chroma_format = get_bits(gb, 2); /* chroma_format */
2231 if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
2232 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2233 return AVERROR_INVALIDDATA;
2236 bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
2237 if (bits_per_raw_sample == 10) {
2239 s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
2241 s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
2244 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
2245 return AVERROR_PATCHWELCOME;
2247 if (rgb != ctx->rgb || s->chroma_format != chroma_format)
2248 s->context_reinit = 1;
2249 s->avctx->bits_per_raw_sample = bits_per_raw_sample;
2251 s->chroma_format = chroma_format;
2253 if (ctx->shape == RECT_SHAPE) {
2254 check_marker(s->avctx, gb, "before video_object_layer_width");
2255 width = get_bits(gb, 14); /* video_object_layer_width */
2256 check_marker(s->avctx, gb, "before video_object_layer_height");
2257 height = get_bits(gb, 14); /* video_object_layer_height */
2258 check_marker(s->avctx, gb, "after video_object_layer_height");
2260 /* Do the same check as non-studio profile */
2261 if (width && height) {
2262 if (s->width && s->height &&
2263 (s->width != width || s->height != height))
2264 s->context_reinit = 1;
2269 s->aspect_ratio_info = get_bits(gb, 4);
2270 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2271 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2272 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2274 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2276 skip_bits(gb, 4); /* frame_rate_code */
2277 skip_bits(gb, 15); /* first_half_bit_rate */
2278 check_marker(s->avctx, gb, "after first_half_bit_rate");
2279 skip_bits(gb, 15); /* latter_half_bit_rate */
2280 check_marker(s->avctx, gb, "after latter_half_bit_rate");
2281 skip_bits(gb, 15); /* first_half_vbv_buffer_size */
2282 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2283 skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
2284 skip_bits(gb, 11); /* first_half_vbv_buffer_size */
2285 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2286 skip_bits(gb, 15); /* latter_half_vbv_occupancy */
2287 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2288 s->low_delay = get_bits1(gb);
2289 s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
2291 next_start_code_studio(gb);
2292 extension_and_user_data(s, gb, 2);
2297 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2299 MpegEncContext *s = &ctx->m;
2300 int width, height, vo_ver_id;
2303 skip_bits(gb, 1); /* random access */
2304 s->vo_type = get_bits(gb, 8);
2306 /* If we are in studio profile (per vo_type), check if its all consistent
2307 * and if so continue pass control to decode_studio_vol_header().
2308 * elIf something is inconsistent, error out
2309 * else continue with (non studio) vol header decpoding.
2311 if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2312 s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2313 if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2314 return AVERROR_INVALIDDATA;
2315 s->studio_profile = 1;
2316 s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2317 return decode_studio_vol_header(ctx, gb);
2318 } else if (s->studio_profile) {
2319 return AVERROR_PATCHWELCOME;
2322 if (get_bits1(gb) != 0) { /* is_ol_id */
2323 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2324 skip_bits(gb, 3); /* vo_priority */
2328 s->aspect_ratio_info = get_bits(gb, 4);
2329 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2330 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2331 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2333 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2336 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2337 int chroma_format = get_bits(gb, 2);
2338 if (chroma_format != CHROMA_420)
2339 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2341 s->low_delay = get_bits1(gb);
2342 if (get_bits1(gb)) { /* vbv parameters */
2343 get_bits(gb, 15); /* first_half_bitrate */
2344 check_marker(s->avctx, gb, "after first_half_bitrate");
2345 get_bits(gb, 15); /* latter_half_bitrate */
2346 check_marker(s->avctx, gb, "after latter_half_bitrate");
2347 get_bits(gb, 15); /* first_half_vbv_buffer_size */
2348 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2349 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2350 get_bits(gb, 11); /* first_half_vbv_occupancy */
2351 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2352 get_bits(gb, 15); /* latter_half_vbv_occupancy */
2353 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2356 /* is setting low delay flag only once the smartest thing to do?
2357 * low delay detection will not be overridden. */
2358 if (s->picture_number == 0) {
2359 switch(s->vo_type) {
2360 case SIMPLE_VO_TYPE:
2361 case ADV_SIMPLE_VO_TYPE:
2370 ctx->shape = get_bits(gb, 2); /* vol shape */
2371 if (ctx->shape != RECT_SHAPE)
2372 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2373 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2374 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2375 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2378 check_marker(s->avctx, gb, "before time_increment_resolution");
2380 s->avctx->framerate.num = get_bits(gb, 16);
2381 if (!s->avctx->framerate.num) {
2382 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2383 return AVERROR_INVALIDDATA;
2386 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2387 if (ctx->time_increment_bits < 1)
2388 ctx->time_increment_bits = 1;
2390 check_marker(s->avctx, gb, "before fixed_vop_rate");
2392 if (get_bits1(gb) != 0) /* fixed_vop_rate */
2393 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2395 s->avctx->framerate.den = 1;
2397 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2401 if (ctx->shape != BIN_ONLY_SHAPE) {
2402 if (ctx->shape == RECT_SHAPE) {
2403 check_marker(s->avctx, gb, "before width");
2404 width = get_bits(gb, 13);
2405 check_marker(s->avctx, gb, "before height");
2406 height = get_bits(gb, 13);
2407 check_marker(s->avctx, gb, "after height");
2408 if (width && height && /* they should be non zero but who knows */
2409 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2410 if (s->width && s->height &&
2411 (s->width != width || s->height != height))
2412 s->context_reinit = 1;
2418 s->progressive_sequence =
2419 s->progressive_frame = get_bits1(gb) ^ 1;
2420 s->interlaced_dct = 0;
2421 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2422 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2423 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2425 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2427 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2429 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2430 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2431 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2432 ctx->vol_sprite_usage == GMC_SPRITE) {
2433 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2434 skip_bits(gb, 13); // sprite_width
2435 check_marker(s->avctx, gb, "after sprite_width");
2436 skip_bits(gb, 13); // sprite_height
2437 check_marker(s->avctx, gb, "after sprite_height");
2438 skip_bits(gb, 13); // sprite_left
2439 check_marker(s->avctx, gb, "after sprite_left");
2440 skip_bits(gb, 13); // sprite_top
2441 check_marker(s->avctx, gb, "after sprite_top");
2443 ctx->num_sprite_warping_points = get_bits(gb, 6);
2444 if (ctx->num_sprite_warping_points > 3) {
2445 av_log(s->avctx, AV_LOG_ERROR,
2446 "%d sprite_warping_points\n",
2447 ctx->num_sprite_warping_points);
2448 ctx->num_sprite_warping_points = 0;
2449 return AVERROR_INVALIDDATA;
2451 s->sprite_warping_accuracy = get_bits(gb, 2);
2452 ctx->sprite_brightness_change = get_bits1(gb);
2453 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2454 skip_bits1(gb); // low_latency_sprite
2456 // FIXME sadct disable bit if verid!=1 && shape not rect
2458 if (get_bits1(gb) == 1) { /* not_8_bit */
2459 s->quant_precision = get_bits(gb, 4); /* quant_precision */
2460 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2461 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2462 if (s->quant_precision != 5)
2463 av_log(s->avctx, AV_LOG_ERROR,
2464 "quant precision %d\n", s->quant_precision);
2465 if (s->quant_precision<3 || s->quant_precision>9) {
2466 s->quant_precision = 5;
2469 s->quant_precision = 5;
2472 // FIXME a bunch of grayscale shape things
2474 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2477 mpeg4_load_default_matrices(s);
2479 /* load custom intra matrix */
2480 if (get_bits1(gb)) {
2482 for (i = 0; i < 64; i++) {
2484 if (get_bits_left(gb) < 8) {
2485 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2486 return AVERROR_INVALIDDATA;
2488 v = get_bits(gb, 8);
2493 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2494 s->intra_matrix[j] = last;
2495 s->chroma_intra_matrix[j] = last;
2498 /* replicate last value */
2499 for (; i < 64; i++) {
2500 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2501 s->intra_matrix[j] = last;
2502 s->chroma_intra_matrix[j] = last;
2506 /* load custom non intra matrix */
2507 if (get_bits1(gb)) {
2509 for (i = 0; i < 64; i++) {
2511 if (get_bits_left(gb) < 8) {
2512 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2513 return AVERROR_INVALIDDATA;
2515 v = get_bits(gb, 8);
2520 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2521 s->inter_matrix[j] = v;
2522 s->chroma_inter_matrix[j] = v;
2525 /* replicate last value */
2526 for (; i < 64; i++) {
2527 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2528 s->inter_matrix[j] = last;
2529 s->chroma_inter_matrix[j] = last;
2533 // FIXME a bunch of grayscale shape things
2537 s->quarter_sample = get_bits1(gb);
2539 s->quarter_sample = 0;
2541 if (get_bits_left(gb) < 4) {
2542 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2543 return AVERROR_INVALIDDATA;
2546 if (!get_bits1(gb)) {
2547 int pos = get_bits_count(gb);
2548 int estimation_method = get_bits(gb, 2);
2549 if (estimation_method < 2) {
2550 if (!get_bits1(gb)) {
2551 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2552 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2553 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2554 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2555 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2556 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2558 if (!get_bits1(gb)) {
2559 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2560 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2561 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2562 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2564 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2565 skip_bits_long(gb, pos - get_bits_count(gb));
2568 if (!get_bits1(gb)) {
2569 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2570 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2571 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2572 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2574 if (!get_bits1(gb)) {
2575 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2576 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2577 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2578 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2579 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2580 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2582 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2583 skip_bits_long(gb, pos - get_bits_count(gb));
2586 if (estimation_method == 1) {
2587 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2588 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2591 av_log(s->avctx, AV_LOG_ERROR,
2592 "Invalid Complexity estimation method %d\n",
2597 ctx->cplx_estimation_trash_i =
2598 ctx->cplx_estimation_trash_p =
2599 ctx->cplx_estimation_trash_b = 0;
2602 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2604 s->data_partitioning = get_bits1(gb);
2605 if (s->data_partitioning)
2606 ctx->rvlc = get_bits1(gb);
2608 if (vo_ver_id != 1) {
2609 ctx->new_pred = get_bits1(gb);
2610 if (ctx->new_pred) {
2611 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2612 skip_bits(gb, 2); /* requested upstream message type */
2613 skip_bits1(gb); /* newpred segment type */
2615 if (get_bits1(gb)) // reduced_res_vop
2616 av_log(s->avctx, AV_LOG_ERROR,
2617 "reduced resolution VOP not supported\n");
2622 ctx->scalability = get_bits1(gb);
2624 if (ctx->scalability) {
2625 GetBitContext bak = *gb;
2626 int h_sampling_factor_n;
2627 int h_sampling_factor_m;
2628 int v_sampling_factor_n;
2629 int v_sampling_factor_m;
2631 skip_bits1(gb); // hierarchy_type
2632 skip_bits(gb, 4); /* ref_layer_id */
2633 skip_bits1(gb); /* ref_layer_sampling_dir */
2634 h_sampling_factor_n = get_bits(gb, 5);
2635 h_sampling_factor_m = get_bits(gb, 5);
2636 v_sampling_factor_n = get_bits(gb, 5);
2637 v_sampling_factor_m = get_bits(gb, 5);
2638 ctx->enhancement_type = get_bits1(gb);
2640 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2641 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2642 /* illegal scalability header (VERY broken encoder),
2643 * trying to workaround */
2644 ctx->scalability = 0;
2647 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2649 // bin shape stuff FIXME
2653 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2654 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2655 s->avctx->framerate.den, s->avctx->framerate.num,
2656 ctx->time_increment_bits,
2658 s->progressive_sequence,
2660 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2661 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2669 * Decode the user data stuff in the header.
2670 * Also initializes divx/xvid/lavc_version/build.
2672 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2674 MpegEncContext *s = &ctx->m;
2678 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2681 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2682 if (show_bits(gb, 23) == 0)
2684 buf[i] = get_bits(gb, 8);
2688 /* divx detection */
2689 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2691 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2693 ctx->divx_version = ver;
2694 ctx->divx_build = build;
2695 s->divx_packed = e == 3 && last == 'p';
2698 /* libavcodec detection */
2699 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2701 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2703 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2705 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2706 av_log(s->avctx, AV_LOG_WARNING,
2707 "Unknown Lavc version string encountered, %d.%d.%d; "
2708 "clamping sub-version values to 8-bits.\n",
2711 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2715 if (strcmp(buf, "ffmpeg") == 0)
2716 ctx->lavc_build = 4600;
2719 ctx->lavc_build = build;
2721 /* Xvid detection */
2722 e = sscanf(buf, "XviD%d", &build);
2724 ctx->xvid_build = build;
2729 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2731 Mpeg4DecContext *ctx = avctx->priv_data;
2732 MpegEncContext *s = &ctx->m;
2734 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2735 if (s->codec_tag == AV_RL32("XVID") ||
2736 s->codec_tag == AV_RL32("XVIX") ||
2737 s->codec_tag == AV_RL32("RMP4") ||
2738 s->codec_tag == AV_RL32("ZMP4") ||
2739 s->codec_tag == AV_RL32("SIPP"))
2740 ctx->xvid_build = 0;
2743 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2744 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2745 ctx->vol_control_parameters == 0)
2746 ctx->divx_version = 400; // divx 4
2748 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2750 ctx->divx_build = -1;
2753 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2754 if (s->codec_tag == AV_RL32("XVIX"))
2755 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2757 if (s->codec_tag == AV_RL32("UMP4"))
2758 s->workaround_bugs |= FF_BUG_UMP4;
2760 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2761 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2763 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2764 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2766 if (ctx->xvid_build <= 3U)
2767 s->padding_bug_score = 256 * 256 * 256 * 64;
2769 if (ctx->xvid_build <= 1U)
2770 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2772 if (ctx->xvid_build <= 12U)
2773 s->workaround_bugs |= FF_BUG_EDGE;
2775 if (ctx->xvid_build <= 32U)
2776 s->workaround_bugs |= FF_BUG_DC_CLIP;
2778 #define SET_QPEL_FUNC(postfix1, postfix2) \
2779 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2780 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2781 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2783 if (ctx->lavc_build < 4653U)
2784 s->workaround_bugs |= FF_BUG_STD_QPEL;
2786 if (ctx->lavc_build < 4655U)
2787 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2789 if (ctx->lavc_build < 4670U)
2790 s->workaround_bugs |= FF_BUG_EDGE;
2792 if (ctx->lavc_build <= 4712U)
2793 s->workaround_bugs |= FF_BUG_DC_CLIP;
2795 if ((ctx->lavc_build&0xFF) >= 100) {
2796 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2797 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2799 s->workaround_bugs |= FF_BUG_IEDGE;
2802 if (ctx->divx_version >= 0)
2803 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2804 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2805 s->padding_bug_score = 256 * 256 * 256 * 64;
2807 if (ctx->divx_version < 500U)
2808 s->workaround_bugs |= FF_BUG_EDGE;
2810 if (ctx->divx_version >= 0)
2811 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2814 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2815 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2816 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2817 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2818 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2819 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2820 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2822 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2823 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2824 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2825 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2826 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2827 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2830 if (avctx->debug & FF_DEBUG_BUGS)
2831 av_log(s->avctx, AV_LOG_DEBUG,
2832 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2833 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2834 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2836 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2837 s->codec_id == AV_CODEC_ID_MPEG4 &&
2838 avctx->idct_algo == FF_IDCT_AUTO) {
2839 avctx->idct_algo = FF_IDCT_XVID;
2840 ff_mpv_idct_init(s);
2847 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2849 MpegEncContext *s = &ctx->m;
2850 int time_incr, time_increment;
2854 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2855 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2856 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2857 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2861 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2862 if (s->partitioned_frame)
2863 s->decode_mb = mpeg4_decode_partitioned_mb;
2865 s->decode_mb = mpeg4_decode_mb;
2868 while (get_bits1(gb) != 0)
2871 check_marker(s->avctx, gb, "before time_increment");
2873 if (ctx->time_increment_bits == 0 ||
2874 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2875 av_log(s->avctx, AV_LOG_WARNING,
2876 "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2878 for (ctx->time_increment_bits = 1;
2879 ctx->time_increment_bits < 16;
2880 ctx->time_increment_bits++) {
2881 if (s->pict_type == AV_PICTURE_TYPE_P ||
2882 (s->pict_type == AV_PICTURE_TYPE_S &&
2883 ctx->vol_sprite_usage == GMC_SPRITE)) {
2884 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2886 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2890 av_log(s->avctx, AV_LOG_WARNING,
2891 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2892 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2893 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2894 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2899 time_increment = get_bits1(gb); // FIXME investigate further
2901 time_increment = get_bits(gb, ctx->time_increment_bits);
2903 if (s->pict_type != AV_PICTURE_TYPE_B) {
2904 s->last_time_base = s->time_base;
2905 s->time_base += time_incr;
2906 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2907 if (s->workaround_bugs & FF_BUG_UMP4) {
2908 if (s->time < s->last_non_b_time) {
2909 /* header is not mpeg-4-compatible, broken encoder,
2910 * trying to workaround */
2912 s->time += s->avctx->framerate.num;
2915 s->pp_time = s->time - s->last_non_b_time;
2916 s->last_non_b_time = s->time;
2918 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2919 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2920 if (s->pp_time <= s->pb_time ||
2921 s->pp_time <= s->pp_time - s->pb_time ||
2923 /* messed up order, maybe after seeking? skipping current B-frame */
2924 return FRAME_SKIPPED;
2926 ff_mpeg4_init_direct_mv(s);
2928 if (ctx->t_frame == 0)
2929 ctx->t_frame = s->pb_time;
2930 if (ctx->t_frame == 0)
2931 ctx->t_frame = 1; // 1/0 protection
2932 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2933 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2934 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2935 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2936 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2937 s->pb_field_time = 2;
2938 s->pp_field_time = 4;
2939 if (!s->progressive_sequence)
2940 return FRAME_SKIPPED;
2944 if (s->avctx->framerate.den)
2945 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2947 pts = AV_NOPTS_VALUE;
2948 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2950 check_marker(s->avctx, gb, "before vop_coded");
2953 if (get_bits1(gb) != 1) {
2954 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2955 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2956 return FRAME_SKIPPED;
2959 decode_new_pred(ctx, gb);
2961 if (ctx->shape != BIN_ONLY_SHAPE &&
2962 (s->pict_type == AV_PICTURE_TYPE_P ||
2963 (s->pict_type == AV_PICTURE_TYPE_S &&
2964 ctx->vol_sprite_usage == GMC_SPRITE))) {
2965 /* rounding type for motion estimation */
2966 s->no_rounding = get_bits1(gb);
2970 // FIXME reduced res stuff
2972 if (ctx->shape != RECT_SHAPE) {
2973 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2974 skip_bits(gb, 13); /* width */
2975 check_marker(s->avctx, gb, "after width");
2976 skip_bits(gb, 13); /* height */
2977 check_marker(s->avctx, gb, "after height");
2978 skip_bits(gb, 13); /* hor_spat_ref */
2979 check_marker(s->avctx, gb, "after hor_spat_ref");
2980 skip_bits(gb, 13); /* ver_spat_ref */
2982 skip_bits1(gb); /* change_CR_disable */
2984 if (get_bits1(gb) != 0)
2985 skip_bits(gb, 8); /* constant_alpha_value */
2988 // FIXME complexity estimation stuff
2990 if (ctx->shape != BIN_ONLY_SHAPE) {
2991 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2992 if (s->pict_type != AV_PICTURE_TYPE_I)
2993 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2994 if (s->pict_type == AV_PICTURE_TYPE_B)
2995 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2997 if (get_bits_left(gb) < 3) {
2998 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2999 return AVERROR_INVALIDDATA;
3001 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
3002 if (!s->progressive_sequence) {
3003 s->top_field_first = get_bits1(gb);
3004 s->alternate_scan = get_bits1(gb);
3006 s->alternate_scan = 0;
3009 if (s->alternate_scan) {
3010 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3011 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3012 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3013 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3015 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3016 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3017 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3018 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3021 if (s->pict_type == AV_PICTURE_TYPE_S) {
3022 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
3023 ctx->vol_sprite_usage == GMC_SPRITE)) {
3024 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
3025 return AVERROR_INVALIDDATA;
3026 if (ctx->sprite_brightness_change)
3027 av_log(s->avctx, AV_LOG_ERROR,
3028 "sprite_brightness_change not supported\n");
3029 if (ctx->vol_sprite_usage == STATIC_SPRITE)
3030 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
3032 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
3033 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
3037 if (ctx->shape != BIN_ONLY_SHAPE) {
3038 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
3039 if (s->qscale == 0) {
3040 av_log(s->avctx, AV_LOG_ERROR,
3041 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
3042 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3045 if (s->pict_type != AV_PICTURE_TYPE_I) {
3046 s->f_code = get_bits(gb, 3); /* fcode_for */
3047 if (s->f_code == 0) {
3048 av_log(s->avctx, AV_LOG_ERROR,
3049 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
3051 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
3056 if (s->pict_type == AV_PICTURE_TYPE_B) {
3057 s->b_code = get_bits(gb, 3);
3058 if (s->b_code == 0) {
3059 av_log(s->avctx, AV_LOG_ERROR,
3060 "Error, header damaged or not MPEG4 header (b_code=0)\n");
3062 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
3067 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
3068 av_log(s->avctx, AV_LOG_DEBUG,
3069 "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
3070 s->qscale, s->f_code, s->b_code,
3071 s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
3072 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
3073 s->top_field_first, s->quarter_sample ? "q" : "h",
3074 s->data_partitioning, ctx->resync_marker,
3075 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
3076 1 - s->no_rounding, s->vo_type,
3077 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
3078 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
3079 ctx->cplx_estimation_trash_b,
3085 if (!ctx->scalability) {
3086 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
3087 skip_bits1(gb); // vop shape coding type
3089 if (ctx->enhancement_type) {
3090 int load_backward_shape = get_bits1(gb);
3091 if (load_backward_shape)
3092 av_log(s->avctx, AV_LOG_ERROR,
3093 "load backward shape isn't supported\n");
3095 skip_bits(gb, 2); // ref_select_code
3098 /* detect buggy encoders which don't set the low_delay flag
3099 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
3100 * easily (although it's buggy too) */
3101 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
3102 ctx->divx_version == -1 && s->picture_number == 0) {
3103 av_log(s->avctx, AV_LOG_WARNING,
3104 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
3108 s->picture_number++; // better than pic number==0 always ;)
3110 // FIXME add short header support
3111 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
3112 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
3114 if (s->workaround_bugs & FF_BUG_EDGE) {
3115 s->h_edge_pos = s->width;
3116 s->v_edge_pos = s->height;
3121 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3123 MpegEncContext *s = &ctx->m;
3125 skip_bits(gb, 16); /* Time_code[63..48] */
3126 check_marker(s->avctx, gb, "after Time_code[63..48]");
3127 skip_bits(gb, 16); /* Time_code[47..32] */
3128 check_marker(s->avctx, gb, "after Time_code[47..32]");
3129 skip_bits(gb, 16); /* Time_code[31..16] */
3130 check_marker(s->avctx, gb, "after Time_code[31..16]");
3131 skip_bits(gb, 16); /* Time_code[15..0] */
3132 check_marker(s->avctx, gb, "after Time_code[15..0]");
3133 skip_bits(gb, 4); /* reserved_bits */
3137 * Decode the next studio vop header.
3138 * @return <0 if something went wrong
3140 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3142 MpegEncContext *s = &ctx->m;
3144 if (get_bits_left(gb) <= 32)
3147 s->partitioned_frame = 0;
3148 s->interlaced_dct = 0;
3149 s->decode_mb = mpeg4_decode_studio_mb;
3151 decode_smpte_tc(ctx, gb);
3153 skip_bits(gb, 10); /* temporal_reference */
3154 skip_bits(gb, 2); /* vop_structure */
3155 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3156 if (get_bits1(gb)) { /* vop_coded */
3157 skip_bits1(gb); /* top_field_first */
3158 skip_bits1(gb); /* repeat_first_field */
3159 s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3162 if (s->pict_type == AV_PICTURE_TYPE_I) {
3164 reset_studio_dc_predictors(s);
3167 if (ctx->shape != BIN_ONLY_SHAPE) {
3168 s->alternate_scan = get_bits1(gb);
3169 s->frame_pred_frame_dct = get_bits1(gb);
3170 s->dct_precision = get_bits(gb, 2);
3171 s->intra_dc_precision = get_bits(gb, 2);
3172 s->q_scale_type = get_bits1(gb);
3175 if (s->alternate_scan) {
3176 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3177 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3178 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3179 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3181 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3182 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3183 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3184 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3187 mpeg4_load_default_matrices(s);
3189 next_start_code_studio(gb);
3190 extension_and_user_data(s, gb, 4);
3195 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3197 MpegEncContext *s = &ctx->m;
3198 int visual_object_type;
3200 skip_bits(gb, 4); /* visual_object_verid */
3201 visual_object_type = get_bits(gb, 4);
3202 if (visual_object_type != VOT_VIDEO_ID) {
3203 avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3204 return AVERROR_PATCHWELCOME;
3207 next_start_code_studio(gb);
3208 extension_and_user_data(s, gb, 1);
3214 * Decode MPEG-4 headers.
3216 * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3217 * @return <0 if an error occurred
3218 * FRAME_SKIPPED if a not coded VOP is found
3221 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
3223 MpegEncContext *s = &ctx->m;
3224 unsigned startcode, v;
3228 /* search next start code */
3231 // If we have not switched to studio profile than we also did not switch bps
3232 // that means something else (like a previous instance) outside set bps which
3233 // would be inconsistant with the currect state, thus reset it
3234 if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3235 s->avctx->bits_per_raw_sample = 0;
3237 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3239 if (get_bits(gb, 8) == 0xF0)
3245 if (get_bits_count(gb) >= gb->size_in_bits) {
3246 if (gb->size_in_bits == 8 &&
3247 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3248 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3249 return FRAME_SKIPPED; // divx bug
3250 } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3251 return 0; // ordinary return value for parsing of extradata
3253 return AVERROR_INVALIDDATA; // end of stream
3256 /* use the bits after the test */
3257 v = get_bits(gb, 8);
3258 startcode = ((startcode << 8) | v) & 0xffffffff;
3260 if ((startcode & 0xFFFFFF00) != 0x100)
3261 continue; // no startcode
3263 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3264 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3265 if (startcode <= 0x11F)
3266 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3267 else if (startcode <= 0x12F)
3268 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3269 else if (startcode <= 0x13F)
3270 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3271 else if (startcode <= 0x15F)
3272 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3273 else if (startcode <= 0x1AF)
3274 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3275 else if (startcode == 0x1B0)
3276 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3277 else if (startcode == 0x1B1)
3278 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3279 else if (startcode == 0x1B2)
3280 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3281 else if (startcode == 0x1B3)
3282 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3283 else if (startcode == 0x1B4)
3284 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3285 else if (startcode == 0x1B5)
3286 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3287 else if (startcode == 0x1B6)
3288 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3289 else if (startcode == 0x1B7)
3290 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3291 else if (startcode == 0x1B8)
3292 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3293 else if (startcode == 0x1B9)
3294 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3295 else if (startcode == 0x1BA)
3296 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3297 else if (startcode == 0x1BB)
3298 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3299 else if (startcode == 0x1BC)
3300 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3301 else if (startcode == 0x1BD)
3302 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3303 else if (startcode == 0x1BE)
3304 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3305 else if (startcode == 0x1BF)
3306 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3307 else if (startcode == 0x1C0)
3308 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3309 else if (startcode == 0x1C1)
3310 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3311 else if (startcode == 0x1C2)
3312 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3313 else if (startcode == 0x1C3)
3314 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3315 else if (startcode <= 0x1C5)
3316 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3317 else if (startcode <= 0x1FF)
3318 av_log(s->avctx, AV_LOG_DEBUG, "System start");
3319 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3322 if (startcode >= 0x120 && startcode <= 0x12F) {
3324 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3328 if ((ret = decode_vol_header(ctx, gb)) < 0)
3330 } else if (startcode == USER_DATA_STARTCODE) {
3331 decode_user_data(ctx, gb);
3332 } else if (startcode == GOP_STARTCODE) {
3333 mpeg4_decode_gop_header(s, gb);
3334 } else if (startcode == VOS_STARTCODE) {
3336 mpeg4_decode_profile_level(s, gb, &profile, &level);
3337 if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3338 (level > 0 && level < 9)) {
3339 s->studio_profile = 1;
3340 next_start_code_studio(gb);
3341 extension_and_user_data(s, gb, 0);
3342 } else if (s->studio_profile) {
3343 avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
3344 return AVERROR_PATCHWELCOME;
3346 s->avctx->profile = profile;
3347 s->avctx->level = level;
3348 } else if (startcode == VISUAL_OBJ_STARTCODE) {
3349 if (s->studio_profile) {
3350 if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3353 mpeg4_decode_visual_object(s, gb);
3354 } else if (startcode == VOP_STARTCODE) {
3363 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3365 s->avctx->has_b_frames = !s->low_delay;
3367 if (s->studio_profile) {
3368 if (!s->avctx->bits_per_raw_sample) {
3369 av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3370 return AVERROR_INVALIDDATA;
3372 return decode_studio_vop_header(ctx, gb);
3374 return decode_vop_header(ctx, gb);
3377 av_cold void ff_mpeg4videodec_static_init(void) {
3378 static int done = 0;
3381 static uint8_t mpeg4_rvlc_rl_tables[2][2][2 * MAX_RUN + MAX_LEVEL + 3];
3383 ff_mpeg4_init_rl_intra();
3384 ff_rl_init(&ff_rvlc_rl_inter, mpeg4_rvlc_rl_tables[0]);
3385 ff_rl_init(&ff_rvlc_rl_intra, mpeg4_rvlc_rl_tables[1]);
3386 INIT_FIRST_VLC_RL(ff_mpeg4_rl_intra, 554);
3387 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3388 INIT_FIRST_VLC_RL(ff_rvlc_rl_intra, 1072);
3389 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3390 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3391 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3392 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3393 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3394 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3395 INIT_VLC_STATIC_FROM_LENGTHS(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3396 ff_sprite_trajectory_lens, 1,
3397 NULL, 0, 0, 0, 0, 128);
3398 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3399 &ff_mb_type_b_tab[0][1], 2, 1,
3400 &ff_mb_type_b_tab[0][0], 2, 1, 16);
3405 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3407 Mpeg4DecContext *ctx = avctx->priv_data;
3408 MpegEncContext *s = &ctx->m;
3410 /* divx 5.01+ bitstream reorder stuff */
3411 /* Since this clobbers the input buffer and hwaccel codecs still need the
3412 * data during hwaccel->end_frame we should not do this any earlier */
3413 if (s->divx_packed) {
3414 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3415 int startcode_found = 0;
3417 if (buf_size - current_pos > 7) {
3420 for (i = current_pos; i < buf_size - 4; i++)
3425 buf[i + 3] == 0xB6) {
3426 startcode_found = !(buf[i + 4] & 0x40);
3431 if (startcode_found) {
3432 if (!ctx->showed_packed_warning) {
3433 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3434 "wasteful way to store B-frames ('packed B-frames'). "
3435 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3436 ctx->showed_packed_warning = 1;
3438 av_fast_padded_malloc(&s->bitstream_buffer,
3439 &s->allocated_bitstream_buffer_size,
3440 buf_size - current_pos);
3441 if (!s->bitstream_buffer) {
3442 s->bitstream_buffer_size = 0;
3443 return AVERROR(ENOMEM);
3445 memcpy(s->bitstream_buffer, buf + current_pos,
3446 buf_size - current_pos);
3447 s->bitstream_buffer_size = buf_size - current_pos;
3455 static int mpeg4_update_thread_context(AVCodecContext *dst,
3456 const AVCodecContext *src)
3458 Mpeg4DecContext *s = dst->priv_data;
3459 const Mpeg4DecContext *s1 = src->priv_data;
3460 int init = s->m.context_initialized;
3462 int ret = ff_mpeg_update_thread_context(dst, src);
3467 // copy all the necessary fields explicitly
3468 s->time_increment_bits = s1->time_increment_bits;
3469 s->shape = s1->shape;
3470 s->vol_sprite_usage = s1->vol_sprite_usage;
3471 s->sprite_brightness_change = s1->sprite_brightness_change;
3472 s->num_sprite_warping_points = s1->num_sprite_warping_points;
3474 s->resync_marker = s1->resync_marker;
3475 s->t_frame = s1->t_frame;
3476 s->new_pred = s1->new_pred;
3477 s->enhancement_type = s1->enhancement_type;
3478 s->scalability = s1->scalability;
3479 s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
3480 s->intra_dc_threshold = s1->intra_dc_threshold;
3481 s->divx_version = s1->divx_version;
3482 s->divx_build = s1->divx_build;
3483 s->xvid_build = s1->xvid_build;
3484 s->lavc_build = s1->lavc_build;
3485 s->showed_packed_warning = s1->showed_packed_warning;
3486 s->vol_control_parameters = s1->vol_control_parameters;
3487 s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
3488 s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
3489 s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
3492 memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3493 memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3495 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3496 ff_xvid_idct_init(&s->m.idsp, dst);
3501 static int mpeg4_update_thread_context_for_user(AVCodecContext *dst,
3502 const AVCodecContext *src)
3504 MpegEncContext *m = dst->priv_data;
3505 const MpegEncContext *m1 = src->priv_data;
3507 m->quarter_sample = m1->quarter_sample;
3508 m->divx_packed = m1->divx_packed;
3514 static av_cold void mpeg4_init_static(void)
3516 INIT_VLC_STATIC_FROM_LENGTHS(&studio_luma_dc, STUDIO_INTRA_BITS, 19,
3517 &ff_mpeg4_studio_dc_luma[0][1], 2,
3518 &ff_mpeg4_studio_dc_luma[0][0], 2, 1,
3521 INIT_VLC_STATIC_FROM_LENGTHS(&studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3522 &ff_mpeg4_studio_dc_chroma[0][1], 2,
3523 &ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
3526 for (unsigned i = 0, offset = 0; i < 12; i++) {
3527 static VLC_TYPE vlc_buf[6498][2];
3529 studio_intra_tab[i].table = &vlc_buf[offset];
3530 studio_intra_tab[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
3531 ff_init_vlc_from_lengths(&studio_intra_tab[i],
3532 STUDIO_INTRA_BITS, 24,
3533 &ff_mpeg4_studio_intra[i][0][1], 2,
3534 &ff_mpeg4_studio_intra[i][0][0], 2, 1,
3535 0, INIT_VLC_STATIC_OVERLONG, NULL);
3536 offset += studio_intra_tab[i].table_size;
3538 ff_mpeg4videodec_static_init();
3541 static av_cold int decode_init(AVCodecContext *avctx)
3543 static AVOnce init_static_once = AV_ONCE_INIT;
3544 Mpeg4DecContext *ctx = avctx->priv_data;
3545 MpegEncContext *s = &ctx->m;
3551 ctx->lavc_build = -1;
3553 if ((ret = ff_h263_decode_init(avctx)) < 0)
3557 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3558 s->decode_mb = mpeg4_decode_mb;
3559 ctx->time_increment_bits = 4; /* default value for broken headers */
3561 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3563 ff_thread_once(&init_static_once, mpeg4_init_static);
3568 #define OFFSET(x) offsetof(MpegEncContext, x)
3569 #define FLAGS AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY
3570 static const AVOption mpeg4_options[] = {
3571 {"quarter_sample", "1/4 subpel MC", OFFSET(quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3572 {"divx_packed", "divx style packed b frames", OFFSET(divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
3576 static const AVClass mpeg4_class = {
3577 .class_name = "MPEG4 Video Decoder",
3578 .item_name = av_default_item_name,
3579 .option = mpeg4_options,
3580 .version = LIBAVUTIL_VERSION_INT,
3583 const AVCodec ff_mpeg4_decoder = {
3585 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3586 .type = AVMEDIA_TYPE_VIDEO,
3587 .id = AV_CODEC_ID_MPEG4,
3588 .priv_data_size = sizeof(Mpeg4DecContext),
3589 .init = decode_init,
3590 .close = ff_h263_decode_end,
3591 .decode = ff_h263_decode_frame,
3592 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3593 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
3594 AV_CODEC_CAP_FRAME_THREADS,
3595 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3596 FF_CODEC_CAP_ALLOCATE_PROGRESS,
3597 .flush = ff_mpeg_flush,
3599 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3600 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3601 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3602 .update_thread_context_for_user = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context_for_user),
3603 .priv_class = &mpeg4_class,
3604 .hw_configs = (const AVCodecHWConfigInternal *const []) {
3605 #if CONFIG_MPEG4_NVDEC_HWACCEL
3606 HWACCEL_NVDEC(mpeg4),
3608 #if CONFIG_MPEG4_VAAPI_HWACCEL
3609 HWACCEL_VAAPI(mpeg4),
3611 #if CONFIG_MPEG4_VDPAU_HWACCEL
3612 HWACCEL_VDPAU(mpeg4),
3614 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3615 HWACCEL_VIDEOTOOLBOX(mpeg4),