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 "error_resilience.h"
32 #include "mpegutils.h"
33 #include "mpegvideo.h"
34 #include "mpegvideodata.h"
35 #include "mpeg4video.h"
42 /* The defines below define the number of bits that are read at once for
43 * reading vlc values. Changing these may improve speed and data cache needs
44 * be aware though that decreasing them may need the number of stages that is
45 * passed to get_vlc* to be increased. */
46 #define SPRITE_TRAJ_VLC_BITS 6
48 #define MB_TYPE_B_VLC_BITS 4
49 #define STUDIO_INTRA_BITS 9
51 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);
53 static VLC dc_lum, dc_chrom;
54 static VLC sprite_trajectory;
55 static VLC mb_type_b_vlc;
57 static const int mb_type_b_map[4] = {
58 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
59 MB_TYPE_L0L1 | MB_TYPE_16x16,
60 MB_TYPE_L1 | MB_TYPE_16x16,
61 MB_TYPE_L0 | MB_TYPE_16x16,
66 * @param n block index (0-3 are luma, 4-5 are chroma)
67 * @param dir the ac prediction direction
69 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
72 int16_t *ac_val, *ac_val1;
73 int8_t *const qscale_table = s->current_picture.qscale_table;
76 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
80 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
84 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
87 for (i = 1; i < 8; i++)
88 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
90 /* different qscale, we must rescale */
91 for (i = 1; i < 8; i++)
92 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
95 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
97 ac_val -= 16 * s->block_wrap[n];
99 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
102 for (i = 1; i < 8; i++)
103 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
105 /* different qscale, we must rescale */
106 for (i = 1; i < 8; i++)
107 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
112 for (i = 1; i < 8; i++)
113 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
116 for (i = 1; i < 8; i++)
117 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
121 * check if the next stuff is a resync marker or the end.
124 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
126 MpegEncContext *s = &ctx->m;
127 int bits_count = get_bits_count(&s->gb);
128 int v = show_bits(&s->gb, 16);
130 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
134 if (s->pict_type == AV_PICTURE_TYPE_B ||
135 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
137 skip_bits(&s->gb, 8 + s->pict_type);
138 bits_count += 8 + s->pict_type;
139 v = show_bits(&s->gb, 16);
142 if (bits_count + 8 >= s->gb.size_in_bits) {
144 v |= 0x7F >> (7 - (bits_count & 7));
149 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
151 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
152 GetBitContext gb = s->gb;
154 skip_bits(&s->gb, 1);
155 align_get_bits(&s->gb);
157 for (len = 0; len < 32; len++)
158 if (get_bits1(&s->gb))
161 mb_num = get_bits(&s->gb, mb_num_bits);
162 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
167 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
174 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
176 MpegEncContext *s = &ctx->m;
177 int a = 2 << s->sprite_warping_accuracy;
178 int rho = 3 - s->sprite_warping_accuracy;
184 int min_ab, i, w2, h2, w3, h3;
185 int sprite_ref[4][2];
186 int virtual_ref[2][2];
187 int64_t sprite_offset[2][2];
188 int64_t sprite_delta[2][2];
190 // only true for rectangle shapes
191 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
192 { 0, s->height }, { s->width, s->height } };
193 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
195 if (w <= 0 || h <= 0)
196 return AVERROR_INVALIDDATA;
198 /* the decoder was not properly initialized and we cannot continue */
199 if (sprite_trajectory.table == NULL)
200 return AVERROR_INVALIDDATA;
202 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
206 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
208 x = get_xbits(gb, length);
210 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
211 check_marker(s->avctx, gb, "before sprite_trajectory");
213 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
215 y = get_xbits(gb, length);
217 check_marker(s->avctx, gb, "after sprite_trajectory");
218 ctx->sprite_traj[i][0] = d[i][0] = x;
219 ctx->sprite_traj[i][1] = d[i][1] = y;
222 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
224 while ((1 << alpha) < w)
226 while ((1 << beta) < h)
227 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
231 // Note, the 4th point isn't used for GMC
232 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
233 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
234 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
235 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
236 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
237 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
238 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
240 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
241 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
242 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
243 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
244 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
245 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
247 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
248 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
250 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
251 * because of that...). Perhaps it should be reordered to be more readable.
252 * The idea behind this virtual_ref mess is to be able to use shifts later
253 * per pixel instead of divides so the distance between points is converted
254 * from w&h based to w2&h2 based which are of the 2^x form. */
255 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
256 ROUNDED_DIV(((w - w2) *
257 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
258 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
259 virtual_ref[0][1] = 16 * vop_ref[0][1] +
260 ROUNDED_DIV(((w - w2) *
261 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
263 virtual_ref[1][0] = 16 * vop_ref[0][0] +
264 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
265 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
266 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
267 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
268 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
270 switch (ctx->num_sprite_warping_points) {
272 sprite_offset[0][0] =
273 sprite_offset[0][1] =
274 sprite_offset[1][0] =
275 sprite_offset[1][1] = 0;
276 sprite_delta[0][0] = a;
278 sprite_delta[1][0] = 0;
279 sprite_delta[1][1] = a;
280 ctx->sprite_shift[0] =
281 ctx->sprite_shift[1] = 0;
284 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
285 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
286 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
287 a * (vop_ref[0][0] / 2);
288 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
289 a * (vop_ref[0][1] / 2);
290 sprite_delta[0][0] = a;
292 sprite_delta[1][0] = 0;
293 sprite_delta[1][1] = a;
294 ctx->sprite_shift[0] =
295 ctx->sprite_shift[1] = 0;
298 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
299 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
300 ((int64_t) -vop_ref[0][0]) +
301 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
302 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
303 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
304 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
305 ((int64_t) -vop_ref[0][0]) +
306 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
307 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
308 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
309 ((int64_t)-2 * vop_ref[0][0] + 1) +
310 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
311 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
312 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
313 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
314 ((int64_t)-2 * vop_ref[0][0] + 1) +
315 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
317 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
318 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
319 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
320 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
321 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
323 ctx->sprite_shift[0] = alpha + rho;
324 ctx->sprite_shift[1] = alpha + rho + 2;
327 min_ab = FFMIN(alpha, beta);
330 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
331 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
332 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
333 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
334 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
335 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
336 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
337 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
338 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
339 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
340 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
341 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
342 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
343 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
344 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
345 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
346 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
347 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
348 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
349 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
351 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
352 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
355 /* try to simplify the situation */
356 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
357 sprite_delta[0][1] == 0 &&
358 sprite_delta[1][0] == 0 &&
359 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
360 sprite_offset[0][0] >>= ctx->sprite_shift[0];
361 sprite_offset[0][1] >>= ctx->sprite_shift[0];
362 sprite_offset[1][0] >>= ctx->sprite_shift[1];
363 sprite_offset[1][1] >>= ctx->sprite_shift[1];
364 sprite_delta[0][0] = a;
365 sprite_delta[0][1] = 0;
366 sprite_delta[1][0] = 0;
367 sprite_delta[1][1] = a;
368 ctx->sprite_shift[0] = 0;
369 ctx->sprite_shift[1] = 0;
370 s->real_sprite_warping_points = 1;
372 int shift_y = 16 - ctx->sprite_shift[0];
373 int shift_c = 16 - ctx->sprite_shift[1];
375 for (i = 0; i < 2; i++) {
376 if (shift_c < 0 || shift_y < 0 ||
377 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
378 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
379 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
380 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
382 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
387 for (i = 0; i < 2; i++) {
388 sprite_offset[0][i] *= 1 << shift_y;
389 sprite_offset[1][i] *= 1 << shift_c;
390 sprite_delta[0][i] *= 1 << shift_y;
391 sprite_delta[1][i] *= 1 << shift_y;
392 ctx->sprite_shift[i] = 16;
395 for (i = 0; i < 2; i++) {
397 sprite_delta[i][0] - a * (1LL<<16),
398 sprite_delta[i][1] - a * (1LL<<16)
401 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
402 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
403 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
404 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
405 llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
406 llabs(sd[0]) >= INT_MAX ||
407 llabs(sd[1]) >= INT_MAX ||
408 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
409 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
410 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
412 avpriv_request_sample(s->avctx, "Overflow on sprite points");
416 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
419 for (i = 0; i < 4; i++) {
420 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
421 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
426 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
427 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
428 return AVERROR_PATCHWELCOME;
431 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
432 MpegEncContext *s = &ctx->m;
433 int len = FFMIN(ctx->time_increment_bits + 3, 15);
438 check_marker(s->avctx, gb, "after new_pred");
444 * Decode the next video packet.
445 * @return <0 if something went wrong
447 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
449 MpegEncContext *s = &ctx->m;
451 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
452 int header_extension = 0, mb_num, len;
454 /* is there enough space left for a video packet + header */
455 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
456 return AVERROR_INVALIDDATA;
458 for (len = 0; len < 32; len++)
459 if (get_bits1(&s->gb))
462 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
463 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
464 return AVERROR_INVALIDDATA;
467 if (ctx->shape != RECT_SHAPE) {
468 header_extension = get_bits1(&s->gb);
469 // FIXME more stuff here
472 mb_num = get_bits(&s->gb, mb_num_bits);
473 if (mb_num >= s->mb_num || !mb_num) {
474 av_log(s->avctx, AV_LOG_ERROR,
475 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
476 return AVERROR_INVALIDDATA;
479 s->mb_x = mb_num % s->mb_width;
480 s->mb_y = mb_num / s->mb_width;
482 if (ctx->shape != BIN_ONLY_SHAPE) {
483 int qscale = get_bits(&s->gb, s->quant_precision);
485 s->chroma_qscale = s->qscale = qscale;
488 if (ctx->shape == RECT_SHAPE)
489 header_extension = get_bits1(&s->gb);
491 if (header_extension) {
494 while (get_bits1(&s->gb) != 0)
497 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
498 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
499 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
501 skip_bits(&s->gb, 2); /* vop coding type */
502 // FIXME not rect stuff here
504 if (ctx->shape != BIN_ONLY_SHAPE) {
505 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
506 // FIXME don't just ignore everything
507 if (s->pict_type == AV_PICTURE_TYPE_S &&
508 ctx->vol_sprite_usage == GMC_SPRITE) {
509 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
510 return AVERROR_INVALIDDATA;
511 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
514 // FIXME reduced res stuff here
516 if (s->pict_type != AV_PICTURE_TYPE_I) {
517 int f_code = get_bits(&s->gb, 3); /* fcode_for */
519 av_log(s->avctx, AV_LOG_ERROR,
520 "Error, video packet header damaged (f_code=0)\n");
522 if (s->pict_type == AV_PICTURE_TYPE_B) {
523 int b_code = get_bits(&s->gb, 3);
525 av_log(s->avctx, AV_LOG_ERROR,
526 "Error, video packet header damaged (b_code=0)\n");
531 decode_new_pred(ctx, &s->gb);
536 static void reset_studio_dc_predictors(MpegEncContext *s)
538 /* Reset DC Predictors */
541 s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
545 * Decode the next video packet.
546 * @return <0 if something went wrong
548 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
550 MpegEncContext *s = &ctx->m;
551 GetBitContext *gb = &s->gb;
555 if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_START_CODE) {
556 vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
557 mb_num = get_bits(gb, vlc_len);
559 if (mb_num >= s->mb_num)
560 return AVERROR_INVALIDDATA;
562 s->mb_x = mb_num % s->mb_width;
563 s->mb_y = mb_num / s->mb_width;
565 if (ctx->shape != BIN_ONLY_SHAPE)
566 s->qscale = mpeg_get_qscale(s);
568 if (get_bits1(gb)) { /* slice_extension_flag */
569 skip_bits1(gb); /* intra_slice */
570 skip_bits1(gb); /* slice_VOP_id_enable */
571 skip_bits(gb, 6); /* slice_VOP_id */
572 while (get_bits1(gb)) /* extra_bit_slice */
573 skip_bits(gb, 8); /* extra_information_slice */
576 reset_studio_dc_predictors(s);
579 return AVERROR_INVALIDDATA;
586 * Get the average motion vector for a GMC MB.
587 * @param n either 0 for the x component or 1 for y
588 * @return the average MV for a GMC MB
590 static inline int get_amv(Mpeg4DecContext *ctx, int n)
592 MpegEncContext *s = &ctx->m;
593 int x, y, mb_v, sum, dx, dy, shift;
594 int len = 1 << (s->f_code + 4);
595 const int a = s->sprite_warping_accuracy;
597 if (s->workaround_bugs & FF_BUG_AMV)
598 len >>= s->quarter_sample;
600 if (s->real_sprite_warping_points == 1) {
601 if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
602 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
604 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
606 dx = s->sprite_delta[n][0];
607 dy = s->sprite_delta[n][1];
608 shift = ctx->sprite_shift[0];
610 dy -= 1 << (shift + a + 1);
612 dx -= 1 << (shift + a + 1);
613 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
616 for (y = 0; y < 16; y++) {
621 for (x = 0; x < 16; x++) {
626 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
638 * Decode the dc value.
639 * @param n block index (0-3 are luma, 4-5 are chroma)
640 * @param dir_ptr the prediction direction will be stored here
641 * @return the quantized dc
643 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
648 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
650 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
652 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
653 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
654 return AVERROR_INVALIDDATA;
662 level = 2 * get_bits1(&s->gb) - 1;
664 if (get_bits1(&s->gb))
665 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
667 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
670 level = get_xbits(&s->gb, code);
674 if (get_bits1(&s->gb) == 0) { /* marker */
675 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
676 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
677 return AVERROR_INVALIDDATA;
683 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
687 * Decode first partition.
688 * @return number of MBs decoded or <0 if an error occurred
690 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
692 MpegEncContext *s = &ctx->m;
694 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
696 /* decode first partition */
697 s->first_slice_line = 1;
698 for (; s->mb_y < s->mb_height; s->mb_y++) {
699 ff_init_block_index(s);
700 for (; s->mb_x < s->mb_width; s->mb_x++) {
701 const int xy = s->mb_x + s->mb_y * s->mb_stride;
706 ff_update_block_index(s);
707 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
708 s->first_slice_line = 0;
710 if (s->pict_type == AV_PICTURE_TYPE_I) {
714 if (show_bits_long(&s->gb, 19) == DC_MARKER)
717 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
719 av_log(s->avctx, AV_LOG_ERROR,
720 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
721 return AVERROR_INVALIDDATA;
725 s->cbp_table[xy] = cbpc & 3;
726 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
730 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
732 s->current_picture.qscale_table[xy] = s->qscale;
734 s->mbintra_table[xy] = 1;
735 for (i = 0; i < 6; i++) {
737 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
739 av_log(s->avctx, AV_LOG_ERROR,
740 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
747 s->pred_dir_table[xy] = dir;
748 } else { /* P/S_TYPE */
749 int mx, my, pred_x, pred_y, bits;
750 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
751 const int stride = s->b8_stride * 2;
754 bits = show_bits(&s->gb, 17);
755 if (bits == MOTION_MARKER)
759 if (bits & 0x10000) {
761 if (s->pict_type == AV_PICTURE_TYPE_S &&
762 ctx->vol_sprite_usage == GMC_SPRITE) {
763 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
767 mx = get_amv(ctx, 0);
768 my = get_amv(ctx, 1);
770 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
777 mot_val[0 + stride] =
778 mot_val[2 + stride] = mx;
781 mot_val[1 + stride] =
782 mot_val[3 + stride] = my;
784 if (s->mbintra_table[xy])
785 ff_clean_intra_table_entries(s);
789 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
791 av_log(s->avctx, AV_LOG_ERROR,
792 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
793 return AVERROR_INVALIDDATA;
798 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
800 s->mb_intra = ((cbpc & 4) != 0);
803 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
804 s->mbintra_table[xy] = 1;
807 mot_val[0 + stride] =
808 mot_val[2 + stride] = 0;
811 mot_val[1 + stride] =
812 mot_val[3 + stride] = 0;
814 if (s->mbintra_table[xy])
815 ff_clean_intra_table_entries(s);
817 if (s->pict_type == AV_PICTURE_TYPE_S &&
818 ctx->vol_sprite_usage == GMC_SPRITE &&
820 s->mcsel = get_bits1(&s->gb);
824 if ((cbpc & 16) == 0) {
825 /* 16x16 motion prediction */
827 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
829 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
831 return AVERROR_INVALIDDATA;
833 my = ff_h263_decode_motion(s, pred_y, s->f_code);
835 return AVERROR_INVALIDDATA;
836 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
839 mx = get_amv(ctx, 0);
840 my = get_amv(ctx, 1);
841 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
848 mot_val[0 + stride] =
849 mot_val[2 + stride] = mx;
852 mot_val[1 + stride] =
853 mot_val[3 + stride] = my;
856 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
858 for (i = 0; i < 4; i++) {
859 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
860 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
862 return AVERROR_INVALIDDATA;
864 my = ff_h263_decode_motion(s, pred_y, s->f_code);
866 return AVERROR_INVALIDDATA;
881 * decode second partition.
882 * @return <0 if an error occurred
884 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
887 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
889 s->mb_x = s->resync_mb_x;
890 s->first_slice_line = 1;
891 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
892 ff_init_block_index(s);
893 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
894 const int xy = s->mb_x + s->mb_y * s->mb_stride;
897 ff_update_block_index(s);
898 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
899 s->first_slice_line = 0;
901 if (s->pict_type == AV_PICTURE_TYPE_I) {
902 int ac_pred = get_bits1(&s->gb);
903 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
905 av_log(s->avctx, AV_LOG_ERROR,
906 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
907 return AVERROR_INVALIDDATA;
910 s->cbp_table[xy] |= cbpy << 2;
911 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
912 } else { /* P || S_TYPE */
913 if (IS_INTRA(s->current_picture.mb_type[xy])) {
916 int ac_pred = get_bits1(&s->gb);
917 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
920 av_log(s->avctx, AV_LOG_ERROR,
921 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
922 return AVERROR_INVALIDDATA;
925 if (s->cbp_table[xy] & 8)
926 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
927 s->current_picture.qscale_table[xy] = s->qscale;
929 for (i = 0; i < 6; i++) {
931 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
933 av_log(s->avctx, AV_LOG_ERROR,
934 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
941 s->cbp_table[xy] &= 3; // remove dquant
942 s->cbp_table[xy] |= cbpy << 2;
943 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
944 s->pred_dir_table[xy] = dir;
945 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
946 s->current_picture.qscale_table[xy] = s->qscale;
947 s->cbp_table[xy] = 0;
949 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
952 av_log(s->avctx, AV_LOG_ERROR,
953 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
954 return AVERROR_INVALIDDATA;
957 if (s->cbp_table[xy] & 8)
958 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
959 s->current_picture.qscale_table[xy] = s->qscale;
961 s->cbp_table[xy] &= 3; // remove dquant
962 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
966 if (mb_num >= mb_count)
974 * Decode the first and second partition.
975 * @return <0 if error (and sets error type in the error_status_table)
977 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
979 MpegEncContext *s = &ctx->m;
982 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
983 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
985 mb_num = mpeg4_decode_partition_a(ctx);
987 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
988 s->mb_x, s->mb_y, part_a_error);
989 return mb_num ? mb_num : AVERROR_INVALIDDATA;
992 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
993 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
994 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
995 s->mb_x, s->mb_y, part_a_error);
996 return AVERROR_INVALIDDATA;
999 s->mb_num_left = mb_num;
1001 if (s->pict_type == AV_PICTURE_TYPE_I) {
1002 while (show_bits(&s->gb, 9) == 1)
1003 skip_bits(&s->gb, 9);
1004 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
1005 av_log(s->avctx, AV_LOG_ERROR,
1006 "marker missing after first I partition at %d %d\n",
1008 return AVERROR_INVALIDDATA;
1011 while (show_bits(&s->gb, 10) == 1)
1012 skip_bits(&s->gb, 10);
1013 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
1014 av_log(s->avctx, AV_LOG_ERROR,
1015 "marker missing after first P partition at %d %d\n",
1017 return AVERROR_INVALIDDATA;
1020 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1021 s->mb_x - 1, s->mb_y, part_a_end);
1023 ret = mpeg4_decode_partition_b(s, mb_num);
1025 if (s->pict_type == AV_PICTURE_TYPE_P)
1026 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1027 s->mb_x, s->mb_y, ER_DC_ERROR);
1030 if (s->pict_type == AV_PICTURE_TYPE_P)
1031 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
1032 s->mb_x - 1, s->mb_y, ER_DC_END);
1040 * @return <0 if an error occurred
1042 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
1043 int n, int coded, int intra, int rvlc)
1045 MpegEncContext *s = &ctx->m;
1046 int level, i, last, run, qmul, qadd;
1047 int av_uninit(dc_pred_dir);
1049 RL_VLC_ELEM *rl_vlc;
1050 const uint8_t *scan_table;
1052 // Note intra & rvlc should be optimized away if this is inlined
1055 if (ctx->use_intra_dc_vlc) {
1057 if (s->partitioned_frame) {
1058 level = s->dc_val[0][s->block_index[n]];
1060 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1062 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1063 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1065 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1073 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1079 rl = &ff_rvlc_rl_intra;
1080 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1082 rl = &ff_mpeg4_rl_intra;
1083 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1086 if (dc_pred_dir == 0)
1087 scan_table = s->intra_v_scantable.permutated; /* left */
1089 scan_table = s->intra_h_scantable.permutated; /* top */
1091 scan_table = s->intra_scantable.permutated;
1098 s->block_last_index[n] = i;
1102 rl = &ff_rvlc_rl_inter;
1104 rl = &ff_h263_rl_inter;
1106 scan_table = s->intra_scantable.permutated;
1108 if (s->mpeg_quant) {
1112 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1114 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1116 qmul = s->qscale << 1;
1117 qadd = (s->qscale - 1) | 1;
1119 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1121 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1125 OPEN_READER(re, &s->gb);
1127 UPDATE_CACHE(re, &s->gb);
1128 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1132 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1133 av_log(s->avctx, AV_LOG_ERROR,
1134 "1. marker bit missing in rvlc esc\n");
1135 return AVERROR_INVALIDDATA;
1137 SKIP_CACHE(re, &s->gb, 1);
1139 last = SHOW_UBITS(re, &s->gb, 1);
1140 SKIP_CACHE(re, &s->gb, 1);
1141 run = SHOW_UBITS(re, &s->gb, 6);
1142 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1143 UPDATE_CACHE(re, &s->gb);
1145 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1146 av_log(s->avctx, AV_LOG_ERROR,
1147 "2. marker bit missing in rvlc esc\n");
1148 return AVERROR_INVALIDDATA;
1150 SKIP_CACHE(re, &s->gb, 1);
1152 level = SHOW_UBITS(re, &s->gb, 11);
1153 SKIP_CACHE(re, &s->gb, 11);
1155 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1156 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1157 return AVERROR_INVALIDDATA;
1159 SKIP_CACHE(re, &s->gb, 5);
1161 level = level * qmul + qadd;
1162 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1163 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1170 cache = GET_CACHE(re, &s->gb);
1173 cache ^= 0xC0000000;
1175 if (cache & 0x80000000) {
1176 if (cache & 0x40000000) {
1178 SKIP_CACHE(re, &s->gb, 2);
1179 last = SHOW_UBITS(re, &s->gb, 1);
1180 SKIP_CACHE(re, &s->gb, 1);
1181 run = SHOW_UBITS(re, &s->gb, 6);
1182 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1183 UPDATE_CACHE(re, &s->gb);
1186 level = SHOW_SBITS(re, &s->gb, 12);
1187 LAST_SKIP_BITS(re, &s->gb, 12);
1189 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1190 av_log(s->avctx, AV_LOG_ERROR,
1191 "1. marker bit missing in 3. esc\n");
1192 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1193 return AVERROR_INVALIDDATA;
1195 SKIP_CACHE(re, &s->gb, 1);
1197 level = SHOW_SBITS(re, &s->gb, 12);
1198 SKIP_CACHE(re, &s->gb, 12);
1200 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1201 av_log(s->avctx, AV_LOG_ERROR,
1202 "2. marker bit missing in 3. esc\n");
1203 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1204 return AVERROR_INVALIDDATA;
1207 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1211 if (s->error_recognition >= FF_ER_COMPLIANT) {
1212 const int abs_level= FFABS(level);
1213 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1214 const int run1= run - rl->max_run[last][abs_level] - 1;
1215 if (abs_level <= rl->max_level[last][run]) {
1216 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1217 return AVERROR_INVALIDDATA;
1219 if (s->error_recognition > FF_ER_COMPLIANT) {
1220 if (abs_level <= rl->max_level[last][run]*2) {
1221 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1222 return AVERROR_INVALIDDATA;
1224 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1225 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1226 return AVERROR_INVALIDDATA;
1233 level = level * qmul + qadd;
1235 level = level * qmul - qadd;
1237 if ((unsigned)(level + 2048) > 4095) {
1238 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1239 if (level > 2560 || level < -2560) {
1240 av_log(s->avctx, AV_LOG_ERROR,
1241 "|level| overflow in 3. esc, qp=%d\n",
1243 return AVERROR_INVALIDDATA;
1246 level = level < 0 ? -2048 : 2047;
1254 SKIP_BITS(re, &s->gb, 2);
1255 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1256 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1257 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1258 LAST_SKIP_BITS(re, &s->gb, 1);
1262 SKIP_BITS(re, &s->gb, 1);
1263 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1265 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1266 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1267 LAST_SKIP_BITS(re, &s->gb, 1);
1272 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1273 LAST_SKIP_BITS(re, &s->gb, 1);
1275 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1279 av_log(s->avctx, AV_LOG_ERROR,
1280 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1281 return AVERROR_INVALIDDATA;
1284 block[scan_table[i]] = level;
1288 block[scan_table[i]] = level;
1290 CLOSE_READER(re, &s->gb);
1295 if (!ctx->use_intra_dc_vlc) {
1296 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1298 i -= i >> 31; // if (i == -1) i = 0;
1301 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1303 i = 63; // FIXME not optimal
1305 s->block_last_index[n] = i;
1310 * decode partition C of one MB.
1311 * @return <0 if an error occurred
1313 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1315 Mpeg4DecContext *ctx = s->avctx->priv_data;
1317 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1319 av_assert2(s == (void*)ctx);
1321 mb_type = s->current_picture.mb_type[xy];
1322 cbp = s->cbp_table[xy];
1324 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1326 if (s->current_picture.qscale_table[xy] != s->qscale)
1327 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1329 if (s->pict_type == AV_PICTURE_TYPE_P ||
1330 s->pict_type == AV_PICTURE_TYPE_S) {
1332 for (i = 0; i < 4; i++) {
1333 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1334 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1336 s->mb_intra = IS_INTRA(mb_type);
1338 if (IS_SKIP(mb_type)) {
1340 for (i = 0; i < 6; i++)
1341 s->block_last_index[i] = -1;
1342 s->mv_dir = MV_DIR_FORWARD;
1343 s->mv_type = MV_TYPE_16X16;
1344 if (s->pict_type == AV_PICTURE_TYPE_S
1345 && ctx->vol_sprite_usage == GMC_SPRITE) {
1352 } else if (s->mb_intra) {
1353 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1354 } else if (!s->mb_intra) {
1355 // s->mcsel = 0; // FIXME do we need to init that?
1357 s->mv_dir = MV_DIR_FORWARD;
1358 if (IS_8X8(mb_type)) {
1359 s->mv_type = MV_TYPE_8X8;
1361 s->mv_type = MV_TYPE_16X16;
1364 } else { /* I-Frame */
1366 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1369 if (!IS_SKIP(mb_type)) {
1371 s->bdsp.clear_blocks(s->block[0]);
1372 /* decode each block */
1373 for (i = 0; i < 6; i++) {
1374 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1375 av_log(s->avctx, AV_LOG_ERROR,
1376 "texture corrupted at %d %d %d\n",
1377 s->mb_x, s->mb_y, s->mb_intra);
1378 return AVERROR_INVALIDDATA;
1384 /* per-MB end of slice check */
1385 if (--s->mb_num_left <= 0) {
1386 if (mpeg4_is_resync(ctx))
1391 if (mpeg4_is_resync(ctx)) {
1392 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1393 if (s->cbp_table[xy + delta])
1400 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1402 Mpeg4DecContext *ctx = s->avctx->priv_data;
1403 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1405 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1406 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1408 av_assert2(s == (void*)ctx);
1409 av_assert2(s->h263_pred);
1411 if (s->pict_type == AV_PICTURE_TYPE_P ||
1412 s->pict_type == AV_PICTURE_TYPE_S) {
1414 if (get_bits1(&s->gb)) {
1417 for (i = 0; i < 6; i++)
1418 s->block_last_index[i] = -1;
1419 s->mv_dir = MV_DIR_FORWARD;
1420 s->mv_type = MV_TYPE_16X16;
1421 if (s->pict_type == AV_PICTURE_TYPE_S &&
1422 ctx->vol_sprite_usage == GMC_SPRITE) {
1423 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1428 s->mv[0][0][0] = get_amv(ctx, 0);
1429 s->mv[0][0][1] = get_amv(ctx, 1);
1432 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1442 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1444 av_log(s->avctx, AV_LOG_ERROR,
1445 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1446 return AVERROR_INVALIDDATA;
1448 } while (cbpc == 20);
1450 s->bdsp.clear_blocks(s->block[0]);
1452 s->mb_intra = ((cbpc & 4) != 0);
1456 if (s->pict_type == AV_PICTURE_TYPE_S &&
1457 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1458 s->mcsel = get_bits1(&s->gb);
1461 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1463 av_log(s->avctx, AV_LOG_ERROR,
1464 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1465 return AVERROR_INVALIDDATA;
1468 cbp = (cbpc & 3) | (cbpy << 2);
1470 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1471 if ((!s->progressive_sequence) &&
1472 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1473 s->interlaced_dct = get_bits1(&s->gb);
1475 s->mv_dir = MV_DIR_FORWARD;
1476 if ((cbpc & 16) == 0) {
1478 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1481 /* 16x16 global motion prediction */
1482 s->mv_type = MV_TYPE_16X16;
1483 mx = get_amv(ctx, 0);
1484 my = get_amv(ctx, 1);
1485 s->mv[0][0][0] = mx;
1486 s->mv[0][0][1] = my;
1487 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1488 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1491 /* 16x8 field motion prediction */
1492 s->mv_type = MV_TYPE_FIELD;
1494 s->field_select[0][0] = get_bits1(&s->gb);
1495 s->field_select[0][1] = get_bits1(&s->gb);
1497 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1499 for (i = 0; i < 2; i++) {
1500 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1502 return AVERROR_INVALIDDATA;
1504 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1506 return AVERROR_INVALIDDATA;
1508 s->mv[0][i][0] = mx;
1509 s->mv[0][i][1] = my;
1512 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1513 /* 16x16 motion prediction */
1514 s->mv_type = MV_TYPE_16X16;
1515 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1516 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1519 return AVERROR_INVALIDDATA;
1521 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1524 return AVERROR_INVALIDDATA;
1525 s->mv[0][0][0] = mx;
1526 s->mv[0][0][1] = my;
1529 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1530 s->mv_type = MV_TYPE_8X8;
1531 for (i = 0; i < 4; i++) {
1532 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1533 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1535 return AVERROR_INVALIDDATA;
1537 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1539 return AVERROR_INVALIDDATA;
1540 s->mv[0][i][0] = mx;
1541 s->mv[0][i][1] = my;
1546 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1547 int modb1; // first bit of modb
1548 int modb2; // second bit of modb
1551 s->mb_intra = 0; // B-frames never contain intra blocks
1552 s->mcsel = 0; // ... true gmc blocks
1555 for (i = 0; i < 2; i++) {
1556 s->last_mv[i][0][0] =
1557 s->last_mv[i][0][1] =
1558 s->last_mv[i][1][0] =
1559 s->last_mv[i][1][1] = 0;
1562 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1565 /* if we skipped it in the future P-frame than skip it now too */
1566 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1568 if (s->mb_skipped) {
1570 for (i = 0; i < 6; i++)
1571 s->block_last_index[i] = -1;
1573 s->mv_dir = MV_DIR_FORWARD;
1574 s->mv_type = MV_TYPE_16X16;
1579 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1585 modb1 = get_bits1(&s->gb);
1587 // like MB_TYPE_B_DIRECT but no vectors coded
1588 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1591 modb2 = get_bits1(&s->gb);
1592 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1594 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1595 return AVERROR_INVALIDDATA;
1597 mb_type = mb_type_b_map[mb_type];
1601 s->bdsp.clear_blocks(s->block[0]);
1602 cbp = get_bits(&s->gb, 6);
1605 if ((!IS_DIRECT(mb_type)) && cbp) {
1606 if (get_bits1(&s->gb))
1607 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1610 if (!s->progressive_sequence) {
1612 s->interlaced_dct = get_bits1(&s->gb);
1614 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1615 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1616 mb_type &= ~MB_TYPE_16x16;
1618 if (USES_LIST(mb_type, 0)) {
1619 s->field_select[0][0] = get_bits1(&s->gb);
1620 s->field_select[0][1] = get_bits1(&s->gb);
1622 if (USES_LIST(mb_type, 1)) {
1623 s->field_select[1][0] = get_bits1(&s->gb);
1624 s->field_select[1][1] = get_bits1(&s->gb);
1630 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1631 s->mv_type = MV_TYPE_16X16;
1633 if (USES_LIST(mb_type, 0)) {
1634 s->mv_dir = MV_DIR_FORWARD;
1636 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1637 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1638 s->last_mv[0][1][0] =
1639 s->last_mv[0][0][0] =
1640 s->mv[0][0][0] = mx;
1641 s->last_mv[0][1][1] =
1642 s->last_mv[0][0][1] =
1643 s->mv[0][0][1] = my;
1646 if (USES_LIST(mb_type, 1)) {
1647 s->mv_dir |= MV_DIR_BACKWARD;
1649 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1650 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1651 s->last_mv[1][1][0] =
1652 s->last_mv[1][0][0] =
1653 s->mv[1][0][0] = mx;
1654 s->last_mv[1][1][1] =
1655 s->last_mv[1][0][1] =
1656 s->mv[1][0][1] = my;
1658 } else if (!IS_DIRECT(mb_type)) {
1659 s->mv_type = MV_TYPE_FIELD;
1661 if (USES_LIST(mb_type, 0)) {
1662 s->mv_dir = MV_DIR_FORWARD;
1664 for (i = 0; i < 2; i++) {
1665 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1666 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1667 s->last_mv[0][i][0] =
1668 s->mv[0][i][0] = mx;
1669 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1673 if (USES_LIST(mb_type, 1)) {
1674 s->mv_dir |= MV_DIR_BACKWARD;
1676 for (i = 0; i < 2; i++) {
1677 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1678 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1679 s->last_mv[1][i][0] =
1680 s->mv[1][i][0] = mx;
1681 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1687 if (IS_DIRECT(mb_type)) {
1688 if (IS_SKIP(mb_type)) {
1692 mx = ff_h263_decode_motion(s, 0, 1);
1693 my = ff_h263_decode_motion(s, 0, 1);
1696 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1697 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1699 s->current_picture.mb_type[xy] = mb_type;
1700 } else { /* I-Frame */
1702 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1704 av_log(s->avctx, AV_LOG_ERROR,
1705 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1706 return AVERROR_INVALIDDATA;
1708 } while (cbpc == 8);
1714 s->ac_pred = get_bits1(&s->gb);
1716 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1718 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1720 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1722 av_log(s->avctx, AV_LOG_ERROR,
1723 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1724 return AVERROR_INVALIDDATA;
1726 cbp = (cbpc & 3) | (cbpy << 2);
1728 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1731 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1733 if (!s->progressive_sequence)
1734 s->interlaced_dct = get_bits1(&s->gb);
1736 s->bdsp.clear_blocks(s->block[0]);
1737 /* decode each block */
1738 for (i = 0; i < 6; i++) {
1739 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1740 return AVERROR_INVALIDDATA;
1746 /* decode each block */
1747 for (i = 0; i < 6; i++) {
1748 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1749 return AVERROR_INVALIDDATA;
1754 /* per-MB end of slice check */
1755 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1756 int next = mpeg4_is_resync(ctx);
1758 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1759 return AVERROR_INVALIDDATA;
1760 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1763 if (s->pict_type == AV_PICTURE_TYPE_B) {
1764 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1765 ff_thread_await_progress(&s->next_picture_ptr->tf,
1766 (s->mb_x + delta >= s->mb_width)
1767 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1769 if (s->next_picture.mbskip_table[xy + delta])
1780 /* As per spec, studio start code search isn't the same as the old type of start code */
1781 static void next_start_code_studio(GetBitContext *gb)
1785 while (get_bits_left(gb) >= 24 && show_bits_long(gb, 24) != 0x1) {
1790 /* additional_code, vlc index */
1791 static const uint8_t ac_state_tab[22][2] =
1817 static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
1819 Mpeg4DecContext *ctx = s->avctx->priv_data;
1821 int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
1822 additional_code_len, sign, mismatch;
1823 VLC *cur_vlc = &ctx->studio_intra_tab[0];
1824 uint8_t *const scantable = s->intra_scantable.permutated;
1825 const uint16_t *quant_matrix;
1827 const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
1828 const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
1832 memset(block, 0, 64 * sizeof(int32_t));
1836 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1837 quant_matrix = s->intra_matrix;
1841 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1843 dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1844 quant_matrix = s->chroma_intra_matrix;
1847 if (dct_dc_size < 0) {
1848 av_log(s->avctx, AV_LOG_ERROR, "illegal dct_dc_size vlc\n");
1849 return AVERROR_INVALIDDATA;
1850 } else if (dct_dc_size == 0) {
1853 dct_diff = get_xbits(&s->gb, dct_dc_size);
1855 if (dct_dc_size > 8) {
1856 if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1857 return AVERROR_INVALIDDATA;
1862 s->last_dc[cc] += dct_diff;
1865 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1867 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1868 /* TODO: support mpeg_quant for AC coefficients */
1870 block[0] = av_clip(block[0], min, max);
1871 mismatch ^= block[0];
1873 /* AC Coefficients */
1875 group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1878 av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1879 return AVERROR_INVALIDDATA;
1882 additional_code_len = ac_state_tab[group][0];
1883 cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
1888 } else if (group >= 1 && group <= 6) {
1889 /* Zero run length (Table B.47) */
1890 run = 1 << additional_code_len;
1891 if (additional_code_len)
1892 run += get_bits(&s->gb, additional_code_len);
1895 } else if (group >= 7 && group <= 12) {
1896 /* Zero run length and +/-1 level (Table B.48) */
1897 code = get_bits(&s->gb, additional_code_len);
1900 run = (1 << (additional_code_len - 1)) + code;
1902 j = scantable[idx++];
1903 block[j] = sign ? 1 : -1;
1904 } else if (group >= 13 && group <= 20) {
1905 /* Level value (Table B.49) */
1906 j = scantable[idx++];
1907 block[j] = get_xbits(&s->gb, additional_code_len);
1908 } else if (group == 21) {
1910 j = scantable[idx++];
1911 additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1912 flc = get_bits(&s->gb, additional_code_len);
1913 if (flc >> (additional_code_len-1))
1914 block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1918 block[j] = ((8 * 2 * block[j] * quant_matrix[j] * s->qscale) >> s->dct_precision) / 32;
1919 block[j] = av_clip(block[j], min, max);
1920 mismatch ^= block[j];
1923 block[63] ^= mismatch & 1;
1928 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1930 int i, j, w, h, idx = 0;
1931 int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1932 dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1933 h = 16 >> (n ? s->chroma_y_shift : 0);
1934 w = 16 >> (n ? s->chroma_x_shift : 0);
1936 block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1937 if (block_mean == 0){
1938 av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1939 return AVERROR_INVALIDDATA;
1941 s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1943 rice_parameter = get_bits(&s->gb, 4);
1944 if (rice_parameter == 0) {
1945 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1946 return AVERROR_INVALIDDATA;
1949 if (rice_parameter == 15)
1952 if (rice_parameter > 11) {
1953 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1954 return AVERROR_INVALIDDATA;
1957 for (i = 0; i < h; i++) {
1958 output = 1 << (s->avctx->bits_per_raw_sample - 1);
1959 top = 1 << (s->avctx->bits_per_raw_sample - 1);
1961 for (j = 0; j < w; j++) {
1965 rice_prefix_code = get_unary(&s->gb, 1, 12);
1968 if (rice_prefix_code == 11)
1969 dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1971 if (rice_prefix_code == 12) {
1972 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1973 return AVERROR_INVALIDDATA;
1975 rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1976 dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1979 /* Map to a signed residual */
1980 if (dpcm_residual & 1)
1981 dpcm_residual = (-1 * dpcm_residual) >> 1;
1983 dpcm_residual = (dpcm_residual >> 1);
1986 top = macroblock[idx-w];
1988 p = left + top - topleft;
1989 min_left_top = FFMIN(left, top);
1990 if (p < min_left_top)
1993 max_left_top = FFMAX(left, top);
1994 if (p > max_left_top)
1997 p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2002 dpcm_residual *= -1;
2004 macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2011 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2015 s->dpcm_direction = 0;
2017 /* StudioMacroblock */
2020 if (get_bits1(&s->gb)) { /* compression_mode */
2022 /* macroblock_type, 1 or 2-bit VLC */
2023 if (!get_bits1(&s->gb)) {
2025 s->qscale = mpeg_get_qscale(s);
2028 for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2029 if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2030 return AVERROR_INVALIDDATA;
2034 check_marker(s->avctx, &s->gb, "DPCM block start");
2035 s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2036 for (i = 0; i < 3; i++) {
2037 if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2038 return AVERROR_INVALIDDATA;
2042 if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2043 next_start_code_studio(&s->gb);
2047 //vcon-stp9L1.bits (first frame)
2048 if (get_bits_left(&s->gb) == 0)
2051 //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2052 if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2058 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2060 int hours, minutes, seconds;
2062 if (!show_bits(gb, 23)) {
2063 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2064 return AVERROR_INVALIDDATA;
2067 hours = get_bits(gb, 5);
2068 minutes = get_bits(gb, 6);
2069 check_marker(s->avctx, gb, "in gop_header");
2070 seconds = get_bits(gb, 6);
2072 s->time_base = seconds + 60*(minutes + 60*hours);
2080 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2083 *profile = get_bits(gb, 4);
2084 *level = get_bits(gb, 4);
2086 // for Simple profile, level 0
2087 if (*profile == 0 && *level == 8) {
2094 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2096 int visual_object_type;
2097 int is_visual_object_identifier = get_bits1(gb);
2099 if (is_visual_object_identifier) {
2102 visual_object_type = get_bits(gb, 4);
2104 if (visual_object_type == VOT_VIDEO_ID ||
2105 visual_object_type == VOT_STILL_TEXTURE_ID) {
2106 int video_signal_type = get_bits1(gb);
2107 if (video_signal_type) {
2108 int video_range, color_description;
2109 skip_bits(gb, 3); // video_format
2110 video_range = get_bits1(gb);
2111 color_description = get_bits1(gb);
2113 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2115 if (color_description) {
2116 s->avctx->color_primaries = get_bits(gb, 8);
2117 s->avctx->color_trc = get_bits(gb, 8);
2118 s->avctx->colorspace = get_bits(gb, 8);
2126 static void mpeg4_load_default_matrices(MpegEncContext *s)
2130 /* load default matrices */
2131 for (i = 0; i < 64; i++) {
2132 int j = s->idsp.idct_permutation[i];
2133 v = ff_mpeg4_default_intra_matrix[i];
2134 s->intra_matrix[j] = v;
2135 s->chroma_intra_matrix[j] = v;
2137 v = ff_mpeg4_default_non_intra_matrix[i];
2138 s->inter_matrix[j] = v;
2139 s->chroma_inter_matrix[j] = v;
2143 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2145 MpegEncContext *s = &ctx->m;
2146 int width, height, vo_ver_id;
2149 skip_bits(gb, 1); /* random access */
2150 s->vo_type = get_bits(gb, 8);
2152 /* If we are in studio profile (per vo_type), check if its all consistent
2153 * and if so continue pass control to decode_studio_vol_header().
2154 * elIf something is inconsistent, error out
2155 * else continue with (non studio) vol header decpoding.
2157 if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2158 s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2159 if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2160 return AVERROR_INVALIDDATA;
2161 s->studio_profile = 1;
2162 s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2163 return decode_studio_vol_header(ctx, gb);
2164 } else if (s->studio_profile) {
2165 return AVERROR_PATCHWELCOME;
2168 if (get_bits1(gb) != 0) { /* is_ol_id */
2169 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2170 skip_bits(gb, 3); /* vo_priority */
2174 s->aspect_ratio_info = get_bits(gb, 4);
2175 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2176 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2177 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2179 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2182 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2183 int chroma_format = get_bits(gb, 2);
2184 if (chroma_format != CHROMA_420)
2185 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2187 s->low_delay = get_bits1(gb);
2188 if (get_bits1(gb)) { /* vbv parameters */
2189 get_bits(gb, 15); /* first_half_bitrate */
2190 check_marker(s->avctx, gb, "after first_half_bitrate");
2191 get_bits(gb, 15); /* latter_half_bitrate */
2192 check_marker(s->avctx, gb, "after latter_half_bitrate");
2193 get_bits(gb, 15); /* first_half_vbv_buffer_size */
2194 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2195 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2196 get_bits(gb, 11); /* first_half_vbv_occupancy */
2197 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2198 get_bits(gb, 15); /* latter_half_vbv_occupancy */
2199 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2202 /* is setting low delay flag only once the smartest thing to do?
2203 * low delay detection will not be overridden. */
2204 if (s->picture_number == 0) {
2205 switch(s->vo_type) {
2206 case SIMPLE_VO_TYPE:
2207 case ADV_SIMPLE_VO_TYPE:
2216 ctx->shape = get_bits(gb, 2); /* vol shape */
2217 if (ctx->shape != RECT_SHAPE)
2218 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2219 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2220 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2221 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2224 check_marker(s->avctx, gb, "before time_increment_resolution");
2226 s->avctx->framerate.num = get_bits(gb, 16);
2227 if (!s->avctx->framerate.num) {
2228 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2229 return AVERROR_INVALIDDATA;
2232 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2233 if (ctx->time_increment_bits < 1)
2234 ctx->time_increment_bits = 1;
2236 check_marker(s->avctx, gb, "before fixed_vop_rate");
2238 if (get_bits1(gb) != 0) /* fixed_vop_rate */
2239 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2241 s->avctx->framerate.den = 1;
2243 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2247 if (ctx->shape != BIN_ONLY_SHAPE) {
2248 if (ctx->shape == RECT_SHAPE) {
2249 check_marker(s->avctx, gb, "before width");
2250 width = get_bits(gb, 13);
2251 check_marker(s->avctx, gb, "before height");
2252 height = get_bits(gb, 13);
2253 check_marker(s->avctx, gb, "after height");
2254 if (width && height && /* they should be non zero but who knows */
2255 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2256 if (s->width && s->height &&
2257 (s->width != width || s->height != height))
2258 s->context_reinit = 1;
2264 s->progressive_sequence =
2265 s->progressive_frame = get_bits1(gb) ^ 1;
2266 s->interlaced_dct = 0;
2267 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2268 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2269 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2271 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2273 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2275 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2276 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2277 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2278 ctx->vol_sprite_usage == GMC_SPRITE) {
2279 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2280 skip_bits(gb, 13); // sprite_width
2281 check_marker(s->avctx, gb, "after sprite_width");
2282 skip_bits(gb, 13); // sprite_height
2283 check_marker(s->avctx, gb, "after sprite_height");
2284 skip_bits(gb, 13); // sprite_left
2285 check_marker(s->avctx, gb, "after sprite_left");
2286 skip_bits(gb, 13); // sprite_top
2287 check_marker(s->avctx, gb, "after sprite_top");
2289 ctx->num_sprite_warping_points = get_bits(gb, 6);
2290 if (ctx->num_sprite_warping_points > 3) {
2291 av_log(s->avctx, AV_LOG_ERROR,
2292 "%d sprite_warping_points\n",
2293 ctx->num_sprite_warping_points);
2294 ctx->num_sprite_warping_points = 0;
2295 return AVERROR_INVALIDDATA;
2297 s->sprite_warping_accuracy = get_bits(gb, 2);
2298 ctx->sprite_brightness_change = get_bits1(gb);
2299 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2300 skip_bits1(gb); // low_latency_sprite
2302 // FIXME sadct disable bit if verid!=1 && shape not rect
2304 if (get_bits1(gb) == 1) { /* not_8_bit */
2305 s->quant_precision = get_bits(gb, 4); /* quant_precision */
2306 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2307 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2308 if (s->quant_precision != 5)
2309 av_log(s->avctx, AV_LOG_ERROR,
2310 "quant precision %d\n", s->quant_precision);
2311 if (s->quant_precision<3 || s->quant_precision>9) {
2312 s->quant_precision = 5;
2315 s->quant_precision = 5;
2318 // FIXME a bunch of grayscale shape things
2320 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2323 mpeg4_load_default_matrices(s);
2325 /* load custom intra matrix */
2326 if (get_bits1(gb)) {
2328 for (i = 0; i < 64; i++) {
2330 if (get_bits_left(gb) < 8) {
2331 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2332 return AVERROR_INVALIDDATA;
2334 v = get_bits(gb, 8);
2339 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2340 s->intra_matrix[j] = last;
2341 s->chroma_intra_matrix[j] = last;
2344 /* replicate last value */
2345 for (; i < 64; i++) {
2346 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2347 s->intra_matrix[j] = last;
2348 s->chroma_intra_matrix[j] = last;
2352 /* load custom non intra matrix */
2353 if (get_bits1(gb)) {
2355 for (i = 0; i < 64; i++) {
2357 if (get_bits_left(gb) < 8) {
2358 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2359 return AVERROR_INVALIDDATA;
2361 v = get_bits(gb, 8);
2366 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2367 s->inter_matrix[j] = v;
2368 s->chroma_inter_matrix[j] = v;
2371 /* replicate last value */
2372 for (; i < 64; i++) {
2373 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2374 s->inter_matrix[j] = last;
2375 s->chroma_inter_matrix[j] = last;
2379 // FIXME a bunch of grayscale shape things
2383 s->quarter_sample = get_bits1(gb);
2385 s->quarter_sample = 0;
2387 if (get_bits_left(gb) < 4) {
2388 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2389 return AVERROR_INVALIDDATA;
2392 if (!get_bits1(gb)) {
2393 int pos = get_bits_count(gb);
2394 int estimation_method = get_bits(gb, 2);
2395 if (estimation_method < 2) {
2396 if (!get_bits1(gb)) {
2397 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2398 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2399 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2400 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2401 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2402 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2404 if (!get_bits1(gb)) {
2405 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2406 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2407 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2408 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2410 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2411 skip_bits_long(gb, pos - get_bits_count(gb));
2414 if (!get_bits1(gb)) {
2415 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2416 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2417 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2418 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2420 if (!get_bits1(gb)) {
2421 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2422 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2423 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2424 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2425 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2426 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2428 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2429 skip_bits_long(gb, pos - get_bits_count(gb));
2432 if (estimation_method == 1) {
2433 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2434 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2437 av_log(s->avctx, AV_LOG_ERROR,
2438 "Invalid Complexity estimation method %d\n",
2443 ctx->cplx_estimation_trash_i =
2444 ctx->cplx_estimation_trash_p =
2445 ctx->cplx_estimation_trash_b = 0;
2448 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2450 s->data_partitioning = get_bits1(gb);
2451 if (s->data_partitioning)
2452 ctx->rvlc = get_bits1(gb);
2454 if (vo_ver_id != 1) {
2455 ctx->new_pred = get_bits1(gb);
2456 if (ctx->new_pred) {
2457 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2458 skip_bits(gb, 2); /* requested upstream message type */
2459 skip_bits1(gb); /* newpred segment type */
2461 if (get_bits1(gb)) // reduced_res_vop
2462 av_log(s->avctx, AV_LOG_ERROR,
2463 "reduced resolution VOP not supported\n");
2468 ctx->scalability = get_bits1(gb);
2470 if (ctx->scalability) {
2471 GetBitContext bak = *gb;
2472 int h_sampling_factor_n;
2473 int h_sampling_factor_m;
2474 int v_sampling_factor_n;
2475 int v_sampling_factor_m;
2477 skip_bits1(gb); // hierarchy_type
2478 skip_bits(gb, 4); /* ref_layer_id */
2479 skip_bits1(gb); /* ref_layer_sampling_dir */
2480 h_sampling_factor_n = get_bits(gb, 5);
2481 h_sampling_factor_m = get_bits(gb, 5);
2482 v_sampling_factor_n = get_bits(gb, 5);
2483 v_sampling_factor_m = get_bits(gb, 5);
2484 ctx->enhancement_type = get_bits1(gb);
2486 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2487 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2488 /* illegal scalability header (VERY broken encoder),
2489 * trying to workaround */
2490 ctx->scalability = 0;
2493 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2495 // bin shape stuff FIXME
2499 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2500 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",
2501 s->avctx->framerate.den, s->avctx->framerate.num,
2502 ctx->time_increment_bits,
2504 s->progressive_sequence,
2506 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2507 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2515 * Decode the user data stuff in the header.
2516 * Also initializes divx/xvid/lavc_version/build.
2518 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2520 MpegEncContext *s = &ctx->m;
2524 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2527 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2528 if (show_bits(gb, 23) == 0)
2530 buf[i] = get_bits(gb, 8);
2534 /* divx detection */
2535 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2537 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2539 ctx->divx_version = ver;
2540 ctx->divx_build = build;
2541 s->divx_packed = e == 3 && last == 'p';
2544 /* libavcodec detection */
2545 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2547 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2549 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2551 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2552 av_log(s->avctx, AV_LOG_WARNING,
2553 "Unknown Lavc version string encountered, %d.%d.%d; "
2554 "clamping sub-version values to 8-bits.\n",
2557 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2561 if (strcmp(buf, "ffmpeg") == 0)
2562 ctx->lavc_build = 4600;
2565 ctx->lavc_build = build;
2567 /* Xvid detection */
2568 e = sscanf(buf, "XviD%d", &build);
2570 ctx->xvid_build = build;
2575 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2577 Mpeg4DecContext *ctx = avctx->priv_data;
2578 MpegEncContext *s = &ctx->m;
2580 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2581 if (s->codec_tag == AV_RL32("XVID") ||
2582 s->codec_tag == AV_RL32("XVIX") ||
2583 s->codec_tag == AV_RL32("RMP4") ||
2584 s->codec_tag == AV_RL32("ZMP4") ||
2585 s->codec_tag == AV_RL32("SIPP"))
2586 ctx->xvid_build = 0;
2589 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2590 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2591 ctx->vol_control_parameters == 0)
2592 ctx->divx_version = 400; // divx 4
2594 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2596 ctx->divx_build = -1;
2599 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2600 if (s->codec_tag == AV_RL32("XVIX"))
2601 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2603 if (s->codec_tag == AV_RL32("UMP4"))
2604 s->workaround_bugs |= FF_BUG_UMP4;
2606 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2607 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2609 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2610 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2612 if (ctx->xvid_build <= 3U)
2613 s->padding_bug_score = 256 * 256 * 256 * 64;
2615 if (ctx->xvid_build <= 1U)
2616 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2618 if (ctx->xvid_build <= 12U)
2619 s->workaround_bugs |= FF_BUG_EDGE;
2621 if (ctx->xvid_build <= 32U)
2622 s->workaround_bugs |= FF_BUG_DC_CLIP;
2624 #define SET_QPEL_FUNC(postfix1, postfix2) \
2625 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2626 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2627 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2629 if (ctx->lavc_build < 4653U)
2630 s->workaround_bugs |= FF_BUG_STD_QPEL;
2632 if (ctx->lavc_build < 4655U)
2633 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2635 if (ctx->lavc_build < 4670U)
2636 s->workaround_bugs |= FF_BUG_EDGE;
2638 if (ctx->lavc_build <= 4712U)
2639 s->workaround_bugs |= FF_BUG_DC_CLIP;
2641 if ((ctx->lavc_build&0xFF) >= 100) {
2642 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2643 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2645 s->workaround_bugs |= FF_BUG_IEDGE;
2648 if (ctx->divx_version >= 0)
2649 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2650 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2651 s->padding_bug_score = 256 * 256 * 256 * 64;
2653 if (ctx->divx_version < 500U)
2654 s->workaround_bugs |= FF_BUG_EDGE;
2656 if (ctx->divx_version >= 0)
2657 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2660 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2661 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2662 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2663 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2664 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2665 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2666 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2668 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2669 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2670 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2671 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2672 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2673 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2676 if (avctx->debug & FF_DEBUG_BUGS)
2677 av_log(s->avctx, AV_LOG_DEBUG,
2678 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2679 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2680 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2682 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2683 s->codec_id == AV_CODEC_ID_MPEG4 &&
2684 avctx->idct_algo == FF_IDCT_AUTO) {
2685 avctx->idct_algo = FF_IDCT_XVID;
2686 ff_mpv_idct_init(s);
2693 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2695 MpegEncContext *s = &ctx->m;
2696 int time_incr, time_increment;
2700 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2701 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2702 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2703 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2707 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2708 if (s->partitioned_frame)
2709 s->decode_mb = mpeg4_decode_partitioned_mb;
2711 s->decode_mb = mpeg4_decode_mb;
2714 while (get_bits1(gb) != 0)
2717 check_marker(s->avctx, gb, "before time_increment");
2719 if (ctx->time_increment_bits == 0 ||
2720 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2721 av_log(s->avctx, AV_LOG_WARNING,
2722 "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);
2724 for (ctx->time_increment_bits = 1;
2725 ctx->time_increment_bits < 16;
2726 ctx->time_increment_bits++) {
2727 if (s->pict_type == AV_PICTURE_TYPE_P ||
2728 (s->pict_type == AV_PICTURE_TYPE_S &&
2729 ctx->vol_sprite_usage == GMC_SPRITE)) {
2730 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2732 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2736 av_log(s->avctx, AV_LOG_WARNING,
2737 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2738 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2739 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2740 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2745 time_increment = get_bits1(gb); // FIXME investigate further
2747 time_increment = get_bits(gb, ctx->time_increment_bits);
2749 if (s->pict_type != AV_PICTURE_TYPE_B) {
2750 s->last_time_base = s->time_base;
2751 s->time_base += time_incr;
2752 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2753 if (s->workaround_bugs & FF_BUG_UMP4) {
2754 if (s->time < s->last_non_b_time) {
2755 /* header is not mpeg-4-compatible, broken encoder,
2756 * trying to workaround */
2758 s->time += s->avctx->framerate.num;
2761 s->pp_time = s->time - s->last_non_b_time;
2762 s->last_non_b_time = s->time;
2764 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2765 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2766 if (s->pp_time <= s->pb_time ||
2767 s->pp_time <= s->pp_time - s->pb_time ||
2769 /* messed up order, maybe after seeking? skipping current B-frame */
2770 return FRAME_SKIPPED;
2772 ff_mpeg4_init_direct_mv(s);
2774 if (ctx->t_frame == 0)
2775 ctx->t_frame = s->pb_time;
2776 if (ctx->t_frame == 0)
2777 ctx->t_frame = 1; // 1/0 protection
2778 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2779 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2780 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2781 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2782 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2783 s->pb_field_time = 2;
2784 s->pp_field_time = 4;
2785 if (!s->progressive_sequence)
2786 return FRAME_SKIPPED;
2790 if (s->avctx->framerate.den)
2791 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2793 pts = AV_NOPTS_VALUE;
2794 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2796 check_marker(s->avctx, gb, "before vop_coded");
2799 if (get_bits1(gb) != 1) {
2800 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2801 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2802 return FRAME_SKIPPED;
2805 decode_new_pred(ctx, gb);
2807 if (ctx->shape != BIN_ONLY_SHAPE &&
2808 (s->pict_type == AV_PICTURE_TYPE_P ||
2809 (s->pict_type == AV_PICTURE_TYPE_S &&
2810 ctx->vol_sprite_usage == GMC_SPRITE))) {
2811 /* rounding type for motion estimation */
2812 s->no_rounding = get_bits1(gb);
2816 // FIXME reduced res stuff
2818 if (ctx->shape != RECT_SHAPE) {
2819 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2820 skip_bits(gb, 13); /* width */
2821 check_marker(s->avctx, gb, "after width");
2822 skip_bits(gb, 13); /* height */
2823 check_marker(s->avctx, gb, "after height");
2824 skip_bits(gb, 13); /* hor_spat_ref */
2825 check_marker(s->avctx, gb, "after hor_spat_ref");
2826 skip_bits(gb, 13); /* ver_spat_ref */
2828 skip_bits1(gb); /* change_CR_disable */
2830 if (get_bits1(gb) != 0)
2831 skip_bits(gb, 8); /* constant_alpha_value */
2834 // FIXME complexity estimation stuff
2836 if (ctx->shape != BIN_ONLY_SHAPE) {
2837 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2838 if (s->pict_type != AV_PICTURE_TYPE_I)
2839 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2840 if (s->pict_type == AV_PICTURE_TYPE_B)
2841 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2843 if (get_bits_left(gb) < 3) {
2844 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2845 return AVERROR_INVALIDDATA;
2847 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2848 if (!s->progressive_sequence) {
2849 s->top_field_first = get_bits1(gb);
2850 s->alternate_scan = get_bits1(gb);
2852 s->alternate_scan = 0;
2855 if (s->alternate_scan) {
2856 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2857 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2858 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2859 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2861 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2862 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2863 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2864 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2867 if (s->pict_type == AV_PICTURE_TYPE_S) {
2868 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2869 ctx->vol_sprite_usage == GMC_SPRITE)) {
2870 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2871 return AVERROR_INVALIDDATA;
2872 if (ctx->sprite_brightness_change)
2873 av_log(s->avctx, AV_LOG_ERROR,
2874 "sprite_brightness_change not supported\n");
2875 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2876 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2878 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2879 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2883 if (ctx->shape != BIN_ONLY_SHAPE) {
2884 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2885 if (s->qscale == 0) {
2886 av_log(s->avctx, AV_LOG_ERROR,
2887 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2888 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2891 if (s->pict_type != AV_PICTURE_TYPE_I) {
2892 s->f_code = get_bits(gb, 3); /* fcode_for */
2893 if (s->f_code == 0) {
2894 av_log(s->avctx, AV_LOG_ERROR,
2895 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2897 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2902 if (s->pict_type == AV_PICTURE_TYPE_B) {
2903 s->b_code = get_bits(gb, 3);
2904 if (s->b_code == 0) {
2905 av_log(s->avctx, AV_LOG_ERROR,
2906 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2908 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2913 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2914 av_log(s->avctx, AV_LOG_DEBUG,
2915 "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",
2916 s->qscale, s->f_code, s->b_code,
2917 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")),
2918 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2919 s->top_field_first, s->quarter_sample ? "q" : "h",
2920 s->data_partitioning, ctx->resync_marker,
2921 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2922 1 - s->no_rounding, s->vo_type,
2923 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2924 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2925 ctx->cplx_estimation_trash_b,
2931 if (!ctx->scalability) {
2932 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2933 skip_bits1(gb); // vop shape coding type
2935 if (ctx->enhancement_type) {
2936 int load_backward_shape = get_bits1(gb);
2937 if (load_backward_shape)
2938 av_log(s->avctx, AV_LOG_ERROR,
2939 "load backward shape isn't supported\n");
2941 skip_bits(gb, 2); // ref_select_code
2944 /* detect buggy encoders which don't set the low_delay flag
2945 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2946 * easily (although it's buggy too) */
2947 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2948 ctx->divx_version == -1 && s->picture_number == 0) {
2949 av_log(s->avctx, AV_LOG_WARNING,
2950 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2954 s->picture_number++; // better than pic number==0 always ;)
2956 // FIXME add short header support
2957 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2958 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2960 if (s->workaround_bugs & FF_BUG_EDGE) {
2961 s->h_edge_pos = s->width;
2962 s->v_edge_pos = s->height;
2967 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2971 if (get_bits1(gb)) {
2972 if (get_bits_left(gb) < 64*8)
2973 return AVERROR_INVALIDDATA;
2974 /* intra_quantiser_matrix */
2975 for (i = 0; i < 64; i++) {
2976 v = get_bits(gb, 8);
2977 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2978 s->intra_matrix[j] = v;
2979 s->chroma_intra_matrix[j] = v;
2983 if (get_bits1(gb)) {
2984 if (get_bits_left(gb) < 64*8)
2985 return AVERROR_INVALIDDATA;
2986 /* non_intra_quantiser_matrix */
2987 for (i = 0; i < 64; i++) {
2992 if (get_bits1(gb)) {
2993 if (get_bits_left(gb) < 64*8)
2994 return AVERROR_INVALIDDATA;
2995 /* chroma_intra_quantiser_matrix */
2996 for (i = 0; i < 64; i++) {
2997 v = get_bits(gb, 8);
2998 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2999 s->chroma_intra_matrix[j] = v;
3003 if (get_bits1(gb)) {
3004 if (get_bits_left(gb) < 64*8)
3005 return AVERROR_INVALIDDATA;
3006 /* chroma_non_intra_quantiser_matrix */
3007 for (i = 0; i < 64; i++) {
3012 next_start_code_studio(gb);
3016 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
3019 uint8_t extension_type;
3021 startcode = show_bits_long(gb, 32);
3022 if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
3024 if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
3025 skip_bits_long(gb, 32);
3026 extension_type = get_bits(gb, 4);
3027 if (extension_type == QUANT_MATRIX_EXT_ID)
3028 read_quant_matrix_ext(s, gb);
3033 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3035 MpegEncContext *s = &ctx->m;
3037 skip_bits(gb, 16); /* Time_code[63..48] */
3038 check_marker(s->avctx, gb, "after Time_code[63..48]");
3039 skip_bits(gb, 16); /* Time_code[47..32] */
3040 check_marker(s->avctx, gb, "after Time_code[47..32]");
3041 skip_bits(gb, 16); /* Time_code[31..16] */
3042 check_marker(s->avctx, gb, "after Time_code[31..16]");
3043 skip_bits(gb, 16); /* Time_code[15..0] */
3044 check_marker(s->avctx, gb, "after Time_code[15..0]");
3045 skip_bits(gb, 4); /* reserved_bits */
3049 * Decode the next studio vop header.
3050 * @return <0 if something went wrong
3052 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3054 MpegEncContext *s = &ctx->m;
3056 if (get_bits_left(gb) <= 32)
3059 s->decode_mb = mpeg4_decode_studio_mb;
3061 decode_smpte_tc(ctx, gb);
3063 skip_bits(gb, 10); /* temporal_reference */
3064 skip_bits(gb, 2); /* vop_structure */
3065 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3066 if (get_bits1(gb)) { /* vop_coded */
3067 skip_bits1(gb); /* top_field_first */
3068 skip_bits1(gb); /* repeat_first_field */
3069 s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3072 if (s->pict_type == AV_PICTURE_TYPE_I) {
3074 reset_studio_dc_predictors(s);
3077 if (ctx->shape != BIN_ONLY_SHAPE) {
3078 s->alternate_scan = get_bits1(gb);
3079 s->frame_pred_frame_dct = get_bits1(gb);
3080 s->dct_precision = get_bits(gb, 2);
3081 s->intra_dc_precision = get_bits(gb, 2);
3082 s->q_scale_type = get_bits1(gb);
3085 if (s->alternate_scan) {
3086 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3087 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3088 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3089 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3091 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3092 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3093 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3094 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3097 mpeg4_load_default_matrices(s);
3099 next_start_code_studio(gb);
3100 extension_and_user_data(s, gb, 4);
3105 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3107 MpegEncContext *s = &ctx->m;
3108 int visual_object_type;
3110 skip_bits(gb, 4); /* visual_object_verid */
3111 visual_object_type = get_bits(gb, 4);
3112 if (visual_object_type != VOT_VIDEO_ID) {
3113 avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3114 return AVERROR_PATCHWELCOME;
3117 next_start_code_studio(gb);
3118 extension_and_user_data(s, gb, 1);
3123 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3125 MpegEncContext *s = &ctx->m;
3127 int bits_per_raw_sample;
3129 // random_accessible_vol and video_object_type_indication have already
3130 // been read by the caller decode_vol_header()
3131 skip_bits(gb, 4); /* video_object_layer_verid */
3132 ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
3133 skip_bits(gb, 4); /* video_object_layer_shape_extension */
3134 skip_bits1(gb); /* progressive_sequence */
3135 if (ctx->shape != BIN_ONLY_SHAPE) {
3136 ctx->rgb = get_bits1(gb); /* rgb_components */
3137 s->chroma_format = get_bits(gb, 2); /* chroma_format */
3138 if (!s->chroma_format) {
3139 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
3140 return AVERROR_INVALIDDATA;
3143 bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
3144 if (bits_per_raw_sample == 10) {
3146 s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
3149 s->avctx->pix_fmt = s->chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
3153 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3154 return AVERROR_PATCHWELCOME;
3156 s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3158 if (ctx->shape == RECT_SHAPE) {
3159 check_marker(s->avctx, gb, "before video_object_layer_width");
3160 width = get_bits(gb, 14); /* video_object_layer_width */
3161 check_marker(s->avctx, gb, "before video_object_layer_height");
3162 height = get_bits(gb, 14); /* video_object_layer_height */
3163 check_marker(s->avctx, gb, "after video_object_layer_height");
3165 /* Do the same check as non-studio profile */
3166 if (width && height) {
3167 if (s->width && s->height &&
3168 (s->width != width || s->height != height))
3169 s->context_reinit = 1;
3174 s->aspect_ratio_info = get_bits(gb, 4);
3175 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
3176 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
3177 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
3179 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
3181 skip_bits(gb, 4); /* frame_rate_code */
3182 skip_bits(gb, 15); /* first_half_bit_rate */
3183 check_marker(s->avctx, gb, "after first_half_bit_rate");
3184 skip_bits(gb, 15); /* latter_half_bit_rate */
3185 check_marker(s->avctx, gb, "after latter_half_bit_rate");
3186 skip_bits(gb, 15); /* first_half_vbv_buffer_size */
3187 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3188 skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
3189 skip_bits(gb, 11); /* first_half_vbv_buffer_size */
3190 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3191 skip_bits(gb, 15); /* latter_half_vbv_occupancy */
3192 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
3193 s->low_delay = get_bits1(gb);
3194 s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
3196 next_start_code_studio(gb);
3197 extension_and_user_data(s, gb, 2);
3203 * Decode MPEG-4 headers.
3204 * @return <0 if no VOP found (or a damaged one)
3205 * FRAME_SKIPPED if a not coded VOP is found
3206 * 0 if a VOP is found
3208 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3210 MpegEncContext *s = &ctx->m;
3211 unsigned startcode, v;
3215 /* search next start code */
3218 // If we have not switched to studio profile than we also did not switch bps
3219 // that means something else (like a previous instance) outside set bps which
3220 // would be inconsistant with the currect state, thus reset it
3221 if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3222 s->avctx->bits_per_raw_sample = 0;
3224 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3226 if (get_bits(gb, 8) == 0xF0)
3232 if (get_bits_count(gb) >= gb->size_in_bits) {
3233 if (gb->size_in_bits == 8 &&
3234 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3235 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3236 return FRAME_SKIPPED; // divx bug
3238 return AVERROR_INVALIDDATA; // end of stream
3241 /* use the bits after the test */
3242 v = get_bits(gb, 8);
3243 startcode = ((startcode << 8) | v) & 0xffffffff;
3245 if ((startcode & 0xFFFFFF00) != 0x100)
3246 continue; // no startcode
3248 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3249 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3250 if (startcode <= 0x11F)
3251 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3252 else if (startcode <= 0x12F)
3253 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3254 else if (startcode <= 0x13F)
3255 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3256 else if (startcode <= 0x15F)
3257 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3258 else if (startcode <= 0x1AF)
3259 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3260 else if (startcode == 0x1B0)
3261 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3262 else if (startcode == 0x1B1)
3263 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3264 else if (startcode == 0x1B2)
3265 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3266 else if (startcode == 0x1B3)
3267 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3268 else if (startcode == 0x1B4)
3269 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3270 else if (startcode == 0x1B5)
3271 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3272 else if (startcode == 0x1B6)
3273 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3274 else if (startcode == 0x1B7)
3275 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3276 else if (startcode == 0x1B8)
3277 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3278 else if (startcode == 0x1B9)
3279 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3280 else if (startcode == 0x1BA)
3281 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3282 else if (startcode == 0x1BB)
3283 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3284 else if (startcode == 0x1BC)
3285 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3286 else if (startcode == 0x1BD)
3287 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3288 else if (startcode == 0x1BE)
3289 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3290 else if (startcode == 0x1BF)
3291 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3292 else if (startcode == 0x1C0)
3293 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3294 else if (startcode == 0x1C1)
3295 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3296 else if (startcode == 0x1C2)
3297 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3298 else if (startcode == 0x1C3)
3299 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3300 else if (startcode <= 0x1C5)
3301 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3302 else if (startcode <= 0x1FF)
3303 av_log(s->avctx, AV_LOG_DEBUG, "System start");
3304 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3307 if (startcode >= 0x120 && startcode <= 0x12F) {
3309 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3313 if ((ret = decode_vol_header(ctx, gb)) < 0)
3315 } else if (startcode == USER_DATA_STARTCODE) {
3316 decode_user_data(ctx, gb);
3317 } else if (startcode == GOP_STARTCODE) {
3318 mpeg4_decode_gop_header(s, gb);
3319 } else if (startcode == VOS_STARTCODE) {
3321 mpeg4_decode_profile_level(s, gb, &profile, &level);
3322 if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3323 (level > 0 && level < 9)) {
3324 s->studio_profile = 1;
3325 next_start_code_studio(gb);
3326 extension_and_user_data(s, gb, 0);
3327 } else if (s->studio_profile) {
3328 avpriv_request_sample(s->avctx, "Mixes studio and non studio profile\n");
3329 return AVERROR_PATCHWELCOME;
3331 s->avctx->profile = profile;
3332 s->avctx->level = level;
3333 } else if (startcode == VISUAL_OBJ_STARTCODE) {
3334 if (s->studio_profile) {
3335 if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3338 mpeg4_decode_visual_object(s, gb);
3339 } else if (startcode == VOP_STARTCODE) {
3348 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3350 s->avctx->has_b_frames = !s->low_delay;
3352 if (s->studio_profile) {
3353 if (!s->avctx->bits_per_raw_sample) {
3354 av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3355 return AVERROR_INVALIDDATA;
3357 return decode_studio_vop_header(ctx, gb);
3359 return decode_vop_header(ctx, gb);
3362 av_cold void ff_mpeg4videodec_static_init(void) {
3363 static int done = 0;
3366 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
3367 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
3368 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
3369 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
3370 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3371 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
3372 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3373 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3374 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3375 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3376 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3377 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3378 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3379 &ff_sprite_trajectory_tab[0][1], 4, 2,
3380 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
3381 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3382 &ff_mb_type_b_tab[0][1], 2, 1,
3383 &ff_mb_type_b_tab[0][0], 2, 1, 16);
3388 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3390 Mpeg4DecContext *ctx = avctx->priv_data;
3391 MpegEncContext *s = &ctx->m;
3393 /* divx 5.01+ bitstream reorder stuff */
3394 /* Since this clobbers the input buffer and hwaccel codecs still need the
3395 * data during hwaccel->end_frame we should not do this any earlier */
3396 if (s->divx_packed) {
3397 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3398 int startcode_found = 0;
3400 if (buf_size - current_pos > 7) {
3403 for (i = current_pos; i < buf_size - 4; i++)
3408 buf[i + 3] == 0xB6) {
3409 startcode_found = !(buf[i + 4] & 0x40);
3414 if (startcode_found) {
3415 if (!ctx->showed_packed_warning) {
3416 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3417 "wasteful way to store B-frames ('packed B-frames'). "
3418 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3419 ctx->showed_packed_warning = 1;
3421 av_fast_padded_malloc(&s->bitstream_buffer,
3422 &s->allocated_bitstream_buffer_size,
3423 buf_size - current_pos);
3424 if (!s->bitstream_buffer) {
3425 s->bitstream_buffer_size = 0;
3426 return AVERROR(ENOMEM);
3428 memcpy(s->bitstream_buffer, buf + current_pos,
3429 buf_size - current_pos);
3430 s->bitstream_buffer_size = buf_size - current_pos;
3438 static int mpeg4_update_thread_context(AVCodecContext *dst,
3439 const AVCodecContext *src)
3441 Mpeg4DecContext *s = dst->priv_data;
3442 const Mpeg4DecContext *s1 = src->priv_data;
3443 int init = s->m.context_initialized;
3445 int ret = ff_mpeg_update_thread_context(dst, src);
3450 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
3452 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3453 ff_xvid_idct_init(&s->m.idsp, dst);
3459 static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
3463 for (i = 0; i < 12; i++) {
3464 ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
3465 &ff_mpeg4_studio_intra[i][0][1], 4, 2,
3466 &ff_mpeg4_studio_intra[i][0][0], 4, 2,
3473 ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
3474 &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
3475 &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
3480 ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3481 &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
3482 &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
3490 static av_cold int decode_init(AVCodecContext *avctx)
3492 Mpeg4DecContext *ctx = avctx->priv_data;
3493 MpegEncContext *s = &ctx->m;
3499 ctx->lavc_build = -1;
3501 if ((ret = ff_h263_decode_init(avctx)) < 0)
3504 ff_mpeg4videodec_static_init();
3505 if ((ret = init_studio_vlcs(ctx)) < 0)
3509 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3510 s->decode_mb = mpeg4_decode_mb;
3511 ctx->time_increment_bits = 4; /* default value for broken headers */
3513 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3514 avctx->internal->allocate_progress = 1;
3519 static av_cold int decode_end(AVCodecContext *avctx)
3521 Mpeg4DecContext *ctx = avctx->priv_data;
3524 if (!avctx->internal->is_copy) {
3525 for (i = 0; i < 12; i++)
3526 ff_free_vlc(&ctx->studio_intra_tab[i]);
3528 ff_free_vlc(&ctx->studio_luma_dc);
3529 ff_free_vlc(&ctx->studio_chroma_dc);
3532 return ff_h263_decode_end(avctx);
3535 static const AVOption mpeg4_options[] = {
3536 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3537 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3541 static const AVClass mpeg4_class = {
3542 .class_name = "MPEG4 Video Decoder",
3543 .item_name = av_default_item_name,
3544 .option = mpeg4_options,
3545 .version = LIBAVUTIL_VERSION_INT,
3548 AVCodec ff_mpeg4_decoder = {
3550 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3551 .type = AVMEDIA_TYPE_VIDEO,
3552 .id = AV_CODEC_ID_MPEG4,
3553 .priv_data_size = sizeof(Mpeg4DecContext),
3554 .init = decode_init,
3555 .close = decode_end,
3556 .decode = ff_h263_decode_frame,
3557 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3558 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
3559 AV_CODEC_CAP_FRAME_THREADS,
3560 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
3561 .flush = ff_mpeg_flush,
3563 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3564 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3565 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3566 .priv_class = &mpeg4_class,
3567 .hw_configs = (const AVCodecHWConfigInternal*[]) {
3568 #if CONFIG_MPEG4_NVDEC_HWACCEL
3569 HWACCEL_NVDEC(mpeg4),
3571 #if CONFIG_MPEG4_VAAPI_HWACCEL
3572 HWACCEL_VAAPI(mpeg4),
3574 #if CONFIG_MPEG4_VDPAU_HWACCEL
3575 HWACCEL_VDPAU(mpeg4),
3577 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3578 HWACCEL_VIDEOTOOLBOX(mpeg4),