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, 2);
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, 2);
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 * 16U + dy * s->mb_y * 16U;
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(&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(&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(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);
1829 int shift = 3 - s->dct_precision;
1833 memset(block, 0, 64 * sizeof(int32_t));
1837 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1838 quant_matrix = s->intra_matrix;
1842 dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
1844 dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
1845 quant_matrix = s->chroma_intra_matrix;
1848 if (dct_dc_size == 0) {
1851 dct_diff = get_xbits(&s->gb, dct_dc_size);
1853 if (dct_dc_size > 8) {
1854 if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
1855 return AVERROR_INVALIDDATA;
1860 s->last_dc[cc] += dct_diff;
1863 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
1865 block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
1866 /* TODO: support mpeg_quant for AC coefficients */
1868 block[0] = av_clip(block[0], min, max);
1869 mismatch ^= block[0];
1871 /* AC Coefficients */
1873 group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
1876 av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
1877 return AVERROR_INVALIDDATA;
1880 additional_code_len = ac_state_tab[group][0];
1881 cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
1886 } else if (group >= 1 && group <= 6) {
1887 /* Zero run length (Table B.47) */
1888 run = 1 << additional_code_len;
1889 if (additional_code_len)
1890 run += get_bits(&s->gb, additional_code_len);
1893 } else if (group >= 7 && group <= 12) {
1894 /* Zero run length and +/-1 level (Table B.48) */
1895 code = get_bits(&s->gb, additional_code_len);
1898 run = (1 << (additional_code_len - 1)) + code;
1901 return AVERROR_INVALIDDATA;
1902 j = scantable[idx++];
1903 block[j] = sign ? 1 : -1;
1904 } else if (group >= 13 && group <= 20) {
1905 /* Level value (Table B.49) */
1907 return AVERROR_INVALIDDATA;
1908 j = scantable[idx++];
1909 block[j] = get_xbits(&s->gb, additional_code_len);
1910 } else if (group == 21) {
1913 return AVERROR_INVALIDDATA;
1914 j = scantable[idx++];
1915 additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
1916 flc = get_bits(&s->gb, additional_code_len);
1917 if (flc >> (additional_code_len-1))
1918 block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
1922 block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
1923 block[j] = av_clip(block[j], min, max);
1924 mismatch ^= block[j];
1927 block[63] ^= mismatch & 1;
1932 static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
1934 int i, j, w, h, idx = 0;
1935 int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
1936 dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
1937 h = 16 >> (n ? s->chroma_y_shift : 0);
1938 w = 16 >> (n ? s->chroma_x_shift : 0);
1940 block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1941 if (block_mean == 0){
1942 av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
1943 return AVERROR_INVALIDDATA;
1945 s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
1947 rice_parameter = get_bits(&s->gb, 4);
1948 if (rice_parameter == 0) {
1949 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1950 return AVERROR_INVALIDDATA;
1953 if (rice_parameter == 15)
1956 if (rice_parameter > 11) {
1957 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
1958 return AVERROR_INVALIDDATA;
1961 for (i = 0; i < h; i++) {
1962 output = 1 << (s->avctx->bits_per_raw_sample - 1);
1963 top = 1 << (s->avctx->bits_per_raw_sample - 1);
1965 for (j = 0; j < w; j++) {
1969 rice_prefix_code = get_unary(&s->gb, 1, 12);
1972 if (rice_prefix_code == 11)
1973 dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
1975 if (rice_prefix_code == 12) {
1976 av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
1977 return AVERROR_INVALIDDATA;
1979 rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
1980 dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
1983 /* Map to a signed residual */
1984 if (dpcm_residual & 1)
1985 dpcm_residual = (-1 * dpcm_residual) >> 1;
1987 dpcm_residual = (dpcm_residual >> 1);
1990 top = macroblock[idx-w];
1992 p = left + top - topleft;
1993 min_left_top = FFMIN(left, top);
1994 if (p < min_left_top)
1997 max_left_top = FFMAX(left, top);
1998 if (p > max_left_top)
2001 p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
2006 dpcm_residual *= -1;
2008 macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
2015 static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
2019 s->dpcm_direction = 0;
2021 /* StudioMacroblock */
2024 if (get_bits1(&s->gb)) { /* compression_mode */
2026 /* macroblock_type, 1 or 2-bit VLC */
2027 if (!get_bits1(&s->gb)) {
2029 s->qscale = mpeg_get_qscale(s);
2032 for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
2033 if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
2034 return AVERROR_INVALIDDATA;
2038 check_marker(s->avctx, &s->gb, "DPCM block start");
2039 s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
2040 for (i = 0; i < 3; i++) {
2041 if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
2042 return AVERROR_INVALIDDATA;
2046 if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
2047 next_start_code_studio(&s->gb);
2051 //vcon-stp9L1.bits (first frame)
2052 if (get_bits_left(&s->gb) == 0)
2055 //vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
2056 if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
2062 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
2064 int hours, minutes, seconds;
2066 if (!show_bits(gb, 23)) {
2067 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
2068 return AVERROR_INVALIDDATA;
2071 hours = get_bits(gb, 5);
2072 minutes = get_bits(gb, 6);
2073 check_marker(s->avctx, gb, "in gop_header");
2074 seconds = get_bits(gb, 6);
2076 s->time_base = seconds + 60*(minutes + 60*hours);
2084 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
2087 *profile = get_bits(gb, 4);
2088 *level = get_bits(gb, 4);
2090 // for Simple profile, level 0
2091 if (*profile == 0 && *level == 8) {
2098 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
2100 int visual_object_type;
2101 int is_visual_object_identifier = get_bits1(gb);
2103 if (is_visual_object_identifier) {
2106 visual_object_type = get_bits(gb, 4);
2108 if (visual_object_type == VOT_VIDEO_ID ||
2109 visual_object_type == VOT_STILL_TEXTURE_ID) {
2110 int video_signal_type = get_bits1(gb);
2111 if (video_signal_type) {
2112 int video_range, color_description;
2113 skip_bits(gb, 3); // video_format
2114 video_range = get_bits1(gb);
2115 color_description = get_bits1(gb);
2117 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
2119 if (color_description) {
2120 s->avctx->color_primaries = get_bits(gb, 8);
2121 s->avctx->color_trc = get_bits(gb, 8);
2122 s->avctx->colorspace = get_bits(gb, 8);
2130 static void mpeg4_load_default_matrices(MpegEncContext *s)
2134 /* load default matrices */
2135 for (i = 0; i < 64; i++) {
2136 int j = s->idsp.idct_permutation[i];
2137 v = ff_mpeg4_default_intra_matrix[i];
2138 s->intra_matrix[j] = v;
2139 s->chroma_intra_matrix[j] = v;
2141 v = ff_mpeg4_default_non_intra_matrix[i];
2142 s->inter_matrix[j] = v;
2143 s->chroma_inter_matrix[j] = v;
2147 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2149 MpegEncContext *s = &ctx->m;
2150 int width, height, vo_ver_id;
2153 skip_bits(gb, 1); /* random access */
2154 s->vo_type = get_bits(gb, 8);
2156 /* If we are in studio profile (per vo_type), check if its all consistent
2157 * and if so continue pass control to decode_studio_vol_header().
2158 * elIf something is inconsistent, error out
2159 * else continue with (non studio) vol header decpoding.
2161 if (s->vo_type == CORE_STUDIO_VO_TYPE ||
2162 s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
2163 if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
2164 return AVERROR_INVALIDDATA;
2165 s->studio_profile = 1;
2166 s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
2167 return decode_studio_vol_header(ctx, gb);
2168 } else if (s->studio_profile) {
2169 return AVERROR_PATCHWELCOME;
2172 if (get_bits1(gb) != 0) { /* is_ol_id */
2173 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
2174 skip_bits(gb, 3); /* vo_priority */
2178 s->aspect_ratio_info = get_bits(gb, 4);
2179 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
2180 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
2181 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
2183 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
2186 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
2187 int chroma_format = get_bits(gb, 2);
2188 if (chroma_format != CHROMA_420)
2189 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
2191 s->low_delay = get_bits1(gb);
2192 if (get_bits1(gb)) { /* vbv parameters */
2193 get_bits(gb, 15); /* first_half_bitrate */
2194 check_marker(s->avctx, gb, "after first_half_bitrate");
2195 get_bits(gb, 15); /* latter_half_bitrate */
2196 check_marker(s->avctx, gb, "after latter_half_bitrate");
2197 get_bits(gb, 15); /* first_half_vbv_buffer_size */
2198 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
2199 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
2200 get_bits(gb, 11); /* first_half_vbv_occupancy */
2201 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
2202 get_bits(gb, 15); /* latter_half_vbv_occupancy */
2203 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
2206 /* is setting low delay flag only once the smartest thing to do?
2207 * low delay detection will not be overridden. */
2208 if (s->picture_number == 0) {
2209 switch(s->vo_type) {
2210 case SIMPLE_VO_TYPE:
2211 case ADV_SIMPLE_VO_TYPE:
2220 ctx->shape = get_bits(gb, 2); /* vol shape */
2221 if (ctx->shape != RECT_SHAPE)
2222 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
2223 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
2224 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
2225 skip_bits(gb, 4); /* video_object_layer_shape_extension */
2228 check_marker(s->avctx, gb, "before time_increment_resolution");
2230 s->avctx->framerate.num = get_bits(gb, 16);
2231 if (!s->avctx->framerate.num) {
2232 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
2233 return AVERROR_INVALIDDATA;
2236 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
2237 if (ctx->time_increment_bits < 1)
2238 ctx->time_increment_bits = 1;
2240 check_marker(s->avctx, gb, "before fixed_vop_rate");
2242 if (get_bits1(gb) != 0) /* fixed_vop_rate */
2243 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
2245 s->avctx->framerate.den = 1;
2247 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2251 if (ctx->shape != BIN_ONLY_SHAPE) {
2252 if (ctx->shape == RECT_SHAPE) {
2253 check_marker(s->avctx, gb, "before width");
2254 width = get_bits(gb, 13);
2255 check_marker(s->avctx, gb, "before height");
2256 height = get_bits(gb, 13);
2257 check_marker(s->avctx, gb, "after height");
2258 if (width && height && /* they should be non zero but who knows */
2259 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
2260 if (s->width && s->height &&
2261 (s->width != width || s->height != height))
2262 s->context_reinit = 1;
2268 s->progressive_sequence =
2269 s->progressive_frame = get_bits1(gb) ^ 1;
2270 s->interlaced_dct = 0;
2271 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
2272 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
2273 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
2275 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
2277 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
2279 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2280 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
2281 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
2282 ctx->vol_sprite_usage == GMC_SPRITE) {
2283 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
2284 skip_bits(gb, 13); // sprite_width
2285 check_marker(s->avctx, gb, "after sprite_width");
2286 skip_bits(gb, 13); // sprite_height
2287 check_marker(s->avctx, gb, "after sprite_height");
2288 skip_bits(gb, 13); // sprite_left
2289 check_marker(s->avctx, gb, "after sprite_left");
2290 skip_bits(gb, 13); // sprite_top
2291 check_marker(s->avctx, gb, "after sprite_top");
2293 ctx->num_sprite_warping_points = get_bits(gb, 6);
2294 if (ctx->num_sprite_warping_points > 3) {
2295 av_log(s->avctx, AV_LOG_ERROR,
2296 "%d sprite_warping_points\n",
2297 ctx->num_sprite_warping_points);
2298 ctx->num_sprite_warping_points = 0;
2299 return AVERROR_INVALIDDATA;
2301 s->sprite_warping_accuracy = get_bits(gb, 2);
2302 ctx->sprite_brightness_change = get_bits1(gb);
2303 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2304 skip_bits1(gb); // low_latency_sprite
2306 // FIXME sadct disable bit if verid!=1 && shape not rect
2308 if (get_bits1(gb) == 1) { /* not_8_bit */
2309 s->quant_precision = get_bits(gb, 4); /* quant_precision */
2310 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
2311 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
2312 if (s->quant_precision != 5)
2313 av_log(s->avctx, AV_LOG_ERROR,
2314 "quant precision %d\n", s->quant_precision);
2315 if (s->quant_precision<3 || s->quant_precision>9) {
2316 s->quant_precision = 5;
2319 s->quant_precision = 5;
2322 // FIXME a bunch of grayscale shape things
2324 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
2327 mpeg4_load_default_matrices(s);
2329 /* load custom intra matrix */
2330 if (get_bits1(gb)) {
2332 for (i = 0; i < 64; i++) {
2334 if (get_bits_left(gb) < 8) {
2335 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2336 return AVERROR_INVALIDDATA;
2338 v = get_bits(gb, 8);
2343 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2344 s->intra_matrix[j] = last;
2345 s->chroma_intra_matrix[j] = last;
2348 /* replicate last value */
2349 for (; i < 64; i++) {
2350 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2351 s->intra_matrix[j] = last;
2352 s->chroma_intra_matrix[j] = last;
2356 /* load custom non intra matrix */
2357 if (get_bits1(gb)) {
2359 for (i = 0; i < 64; i++) {
2361 if (get_bits_left(gb) < 8) {
2362 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2363 return AVERROR_INVALIDDATA;
2365 v = get_bits(gb, 8);
2370 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2371 s->inter_matrix[j] = v;
2372 s->chroma_inter_matrix[j] = v;
2375 /* replicate last value */
2376 for (; i < 64; i++) {
2377 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2378 s->inter_matrix[j] = last;
2379 s->chroma_inter_matrix[j] = last;
2383 // FIXME a bunch of grayscale shape things
2387 s->quarter_sample = get_bits1(gb);
2389 s->quarter_sample = 0;
2391 if (get_bits_left(gb) < 4) {
2392 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2393 return AVERROR_INVALIDDATA;
2396 if (!get_bits1(gb)) {
2397 int pos = get_bits_count(gb);
2398 int estimation_method = get_bits(gb, 2);
2399 if (estimation_method < 2) {
2400 if (!get_bits1(gb)) {
2401 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2402 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2403 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2404 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2405 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2406 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2408 if (!get_bits1(gb)) {
2409 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2410 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2411 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2412 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2414 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2415 skip_bits_long(gb, pos - get_bits_count(gb));
2418 if (!get_bits1(gb)) {
2419 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2420 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2421 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2422 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2424 if (!get_bits1(gb)) {
2425 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2426 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2427 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2428 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2429 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2430 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2432 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2433 skip_bits_long(gb, pos - get_bits_count(gb));
2436 if (estimation_method == 1) {
2437 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2438 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2441 av_log(s->avctx, AV_LOG_ERROR,
2442 "Invalid Complexity estimation method %d\n",
2447 ctx->cplx_estimation_trash_i =
2448 ctx->cplx_estimation_trash_p =
2449 ctx->cplx_estimation_trash_b = 0;
2452 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2454 s->data_partitioning = get_bits1(gb);
2455 if (s->data_partitioning)
2456 ctx->rvlc = get_bits1(gb);
2458 if (vo_ver_id != 1) {
2459 ctx->new_pred = get_bits1(gb);
2460 if (ctx->new_pred) {
2461 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2462 skip_bits(gb, 2); /* requested upstream message type */
2463 skip_bits1(gb); /* newpred segment type */
2465 if (get_bits1(gb)) // reduced_res_vop
2466 av_log(s->avctx, AV_LOG_ERROR,
2467 "reduced resolution VOP not supported\n");
2472 ctx->scalability = get_bits1(gb);
2474 if (ctx->scalability) {
2475 GetBitContext bak = *gb;
2476 int h_sampling_factor_n;
2477 int h_sampling_factor_m;
2478 int v_sampling_factor_n;
2479 int v_sampling_factor_m;
2481 skip_bits1(gb); // hierarchy_type
2482 skip_bits(gb, 4); /* ref_layer_id */
2483 skip_bits1(gb); /* ref_layer_sampling_dir */
2484 h_sampling_factor_n = get_bits(gb, 5);
2485 h_sampling_factor_m = get_bits(gb, 5);
2486 v_sampling_factor_n = get_bits(gb, 5);
2487 v_sampling_factor_m = get_bits(gb, 5);
2488 ctx->enhancement_type = get_bits1(gb);
2490 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2491 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2492 /* illegal scalability header (VERY broken encoder),
2493 * trying to workaround */
2494 ctx->scalability = 0;
2497 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2499 // bin shape stuff FIXME
2503 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2504 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",
2505 s->avctx->framerate.den, s->avctx->framerate.num,
2506 ctx->time_increment_bits,
2508 s->progressive_sequence,
2510 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2511 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2519 * Decode the user data stuff in the header.
2520 * Also initializes divx/xvid/lavc_version/build.
2522 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2524 MpegEncContext *s = &ctx->m;
2528 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2531 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2532 if (show_bits(gb, 23) == 0)
2534 buf[i] = get_bits(gb, 8);
2538 /* divx detection */
2539 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2541 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2543 ctx->divx_version = ver;
2544 ctx->divx_build = build;
2545 s->divx_packed = e == 3 && last == 'p';
2548 /* libavcodec detection */
2549 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2551 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2553 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2555 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2556 av_log(s->avctx, AV_LOG_WARNING,
2557 "Unknown Lavc version string encountered, %d.%d.%d; "
2558 "clamping sub-version values to 8-bits.\n",
2561 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2565 if (strcmp(buf, "ffmpeg") == 0)
2566 ctx->lavc_build = 4600;
2569 ctx->lavc_build = build;
2571 /* Xvid detection */
2572 e = sscanf(buf, "XviD%d", &build);
2574 ctx->xvid_build = build;
2579 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2581 Mpeg4DecContext *ctx = avctx->priv_data;
2582 MpegEncContext *s = &ctx->m;
2584 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2585 if (s->codec_tag == AV_RL32("XVID") ||
2586 s->codec_tag == AV_RL32("XVIX") ||
2587 s->codec_tag == AV_RL32("RMP4") ||
2588 s->codec_tag == AV_RL32("ZMP4") ||
2589 s->codec_tag == AV_RL32("SIPP"))
2590 ctx->xvid_build = 0;
2593 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2594 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2595 ctx->vol_control_parameters == 0)
2596 ctx->divx_version = 400; // divx 4
2598 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2600 ctx->divx_build = -1;
2603 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2604 if (s->codec_tag == AV_RL32("XVIX"))
2605 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2607 if (s->codec_tag == AV_RL32("UMP4"))
2608 s->workaround_bugs |= FF_BUG_UMP4;
2610 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2611 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2613 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2614 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2616 if (ctx->xvid_build <= 3U)
2617 s->padding_bug_score = 256 * 256 * 256 * 64;
2619 if (ctx->xvid_build <= 1U)
2620 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2622 if (ctx->xvid_build <= 12U)
2623 s->workaround_bugs |= FF_BUG_EDGE;
2625 if (ctx->xvid_build <= 32U)
2626 s->workaround_bugs |= FF_BUG_DC_CLIP;
2628 #define SET_QPEL_FUNC(postfix1, postfix2) \
2629 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2630 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2631 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2633 if (ctx->lavc_build < 4653U)
2634 s->workaround_bugs |= FF_BUG_STD_QPEL;
2636 if (ctx->lavc_build < 4655U)
2637 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2639 if (ctx->lavc_build < 4670U)
2640 s->workaround_bugs |= FF_BUG_EDGE;
2642 if (ctx->lavc_build <= 4712U)
2643 s->workaround_bugs |= FF_BUG_DC_CLIP;
2645 if ((ctx->lavc_build&0xFF) >= 100) {
2646 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2647 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2649 s->workaround_bugs |= FF_BUG_IEDGE;
2652 if (ctx->divx_version >= 0)
2653 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2654 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2655 s->padding_bug_score = 256 * 256 * 256 * 64;
2657 if (ctx->divx_version < 500U)
2658 s->workaround_bugs |= FF_BUG_EDGE;
2660 if (ctx->divx_version >= 0)
2661 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2664 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2665 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2666 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2667 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2668 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2669 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2670 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2672 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2673 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2674 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2675 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2676 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2677 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2680 if (avctx->debug & FF_DEBUG_BUGS)
2681 av_log(s->avctx, AV_LOG_DEBUG,
2682 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2683 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2684 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2686 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2687 s->codec_id == AV_CODEC_ID_MPEG4 &&
2688 avctx->idct_algo == FF_IDCT_AUTO) {
2689 avctx->idct_algo = FF_IDCT_XVID;
2690 ff_mpv_idct_init(s);
2697 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2699 MpegEncContext *s = &ctx->m;
2700 int time_incr, time_increment;
2704 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2705 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2706 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2707 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2711 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2712 if (s->partitioned_frame)
2713 s->decode_mb = mpeg4_decode_partitioned_mb;
2715 s->decode_mb = mpeg4_decode_mb;
2718 while (get_bits1(gb) != 0)
2721 check_marker(s->avctx, gb, "before time_increment");
2723 if (ctx->time_increment_bits == 0 ||
2724 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2725 av_log(s->avctx, AV_LOG_WARNING,
2726 "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);
2728 for (ctx->time_increment_bits = 1;
2729 ctx->time_increment_bits < 16;
2730 ctx->time_increment_bits++) {
2731 if (s->pict_type == AV_PICTURE_TYPE_P ||
2732 (s->pict_type == AV_PICTURE_TYPE_S &&
2733 ctx->vol_sprite_usage == GMC_SPRITE)) {
2734 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2736 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2740 av_log(s->avctx, AV_LOG_WARNING,
2741 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2742 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2743 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2744 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2749 time_increment = get_bits1(gb); // FIXME investigate further
2751 time_increment = get_bits(gb, ctx->time_increment_bits);
2753 if (s->pict_type != AV_PICTURE_TYPE_B) {
2754 s->last_time_base = s->time_base;
2755 s->time_base += time_incr;
2756 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2757 if (s->workaround_bugs & FF_BUG_UMP4) {
2758 if (s->time < s->last_non_b_time) {
2759 /* header is not mpeg-4-compatible, broken encoder,
2760 * trying to workaround */
2762 s->time += s->avctx->framerate.num;
2765 s->pp_time = s->time - s->last_non_b_time;
2766 s->last_non_b_time = s->time;
2768 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2769 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2770 if (s->pp_time <= s->pb_time ||
2771 s->pp_time <= s->pp_time - s->pb_time ||
2773 /* messed up order, maybe after seeking? skipping current B-frame */
2774 return FRAME_SKIPPED;
2776 ff_mpeg4_init_direct_mv(s);
2778 if (ctx->t_frame == 0)
2779 ctx->t_frame = s->pb_time;
2780 if (ctx->t_frame == 0)
2781 ctx->t_frame = 1; // 1/0 protection
2782 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2783 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2784 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2785 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2786 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2787 s->pb_field_time = 2;
2788 s->pp_field_time = 4;
2789 if (!s->progressive_sequence)
2790 return FRAME_SKIPPED;
2794 if (s->avctx->framerate.den)
2795 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2797 pts = AV_NOPTS_VALUE;
2798 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2800 check_marker(s->avctx, gb, "before vop_coded");
2803 if (get_bits1(gb) != 1) {
2804 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2805 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2806 return FRAME_SKIPPED;
2809 decode_new_pred(ctx, gb);
2811 if (ctx->shape != BIN_ONLY_SHAPE &&
2812 (s->pict_type == AV_PICTURE_TYPE_P ||
2813 (s->pict_type == AV_PICTURE_TYPE_S &&
2814 ctx->vol_sprite_usage == GMC_SPRITE))) {
2815 /* rounding type for motion estimation */
2816 s->no_rounding = get_bits1(gb);
2820 // FIXME reduced res stuff
2822 if (ctx->shape != RECT_SHAPE) {
2823 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2824 skip_bits(gb, 13); /* width */
2825 check_marker(s->avctx, gb, "after width");
2826 skip_bits(gb, 13); /* height */
2827 check_marker(s->avctx, gb, "after height");
2828 skip_bits(gb, 13); /* hor_spat_ref */
2829 check_marker(s->avctx, gb, "after hor_spat_ref");
2830 skip_bits(gb, 13); /* ver_spat_ref */
2832 skip_bits1(gb); /* change_CR_disable */
2834 if (get_bits1(gb) != 0)
2835 skip_bits(gb, 8); /* constant_alpha_value */
2838 // FIXME complexity estimation stuff
2840 if (ctx->shape != BIN_ONLY_SHAPE) {
2841 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2842 if (s->pict_type != AV_PICTURE_TYPE_I)
2843 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2844 if (s->pict_type == AV_PICTURE_TYPE_B)
2845 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2847 if (get_bits_left(gb) < 3) {
2848 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2849 return AVERROR_INVALIDDATA;
2851 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2852 if (!s->progressive_sequence) {
2853 s->top_field_first = get_bits1(gb);
2854 s->alternate_scan = get_bits1(gb);
2856 s->alternate_scan = 0;
2859 if (s->alternate_scan) {
2860 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2861 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2862 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2863 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2865 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2866 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2867 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2868 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2871 if (s->pict_type == AV_PICTURE_TYPE_S) {
2872 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2873 ctx->vol_sprite_usage == GMC_SPRITE)) {
2874 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2875 return AVERROR_INVALIDDATA;
2876 if (ctx->sprite_brightness_change)
2877 av_log(s->avctx, AV_LOG_ERROR,
2878 "sprite_brightness_change not supported\n");
2879 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2880 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2882 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2883 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2887 if (ctx->shape != BIN_ONLY_SHAPE) {
2888 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2889 if (s->qscale == 0) {
2890 av_log(s->avctx, AV_LOG_ERROR,
2891 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2892 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2895 if (s->pict_type != AV_PICTURE_TYPE_I) {
2896 s->f_code = get_bits(gb, 3); /* fcode_for */
2897 if (s->f_code == 0) {
2898 av_log(s->avctx, AV_LOG_ERROR,
2899 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2901 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2906 if (s->pict_type == AV_PICTURE_TYPE_B) {
2907 s->b_code = get_bits(gb, 3);
2908 if (s->b_code == 0) {
2909 av_log(s->avctx, AV_LOG_ERROR,
2910 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2912 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2917 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2918 av_log(s->avctx, AV_LOG_DEBUG,
2919 "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",
2920 s->qscale, s->f_code, s->b_code,
2921 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")),
2922 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2923 s->top_field_first, s->quarter_sample ? "q" : "h",
2924 s->data_partitioning, ctx->resync_marker,
2925 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2926 1 - s->no_rounding, s->vo_type,
2927 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2928 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2929 ctx->cplx_estimation_trash_b,
2935 if (!ctx->scalability) {
2936 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2937 skip_bits1(gb); // vop shape coding type
2939 if (ctx->enhancement_type) {
2940 int load_backward_shape = get_bits1(gb);
2941 if (load_backward_shape)
2942 av_log(s->avctx, AV_LOG_ERROR,
2943 "load backward shape isn't supported\n");
2945 skip_bits(gb, 2); // ref_select_code
2948 /* detect buggy encoders which don't set the low_delay flag
2949 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2950 * easily (although it's buggy too) */
2951 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2952 ctx->divx_version == -1 && s->picture_number == 0) {
2953 av_log(s->avctx, AV_LOG_WARNING,
2954 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2958 s->picture_number++; // better than pic number==0 always ;)
2960 // FIXME add short header support
2961 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2962 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2964 if (s->workaround_bugs & FF_BUG_EDGE) {
2965 s->h_edge_pos = s->width;
2966 s->v_edge_pos = s->height;
2971 static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
2975 if (get_bits1(gb)) {
2976 if (get_bits_left(gb) < 64*8)
2977 return AVERROR_INVALIDDATA;
2978 /* intra_quantiser_matrix */
2979 for (i = 0; i < 64; i++) {
2980 v = get_bits(gb, 8);
2981 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2982 s->intra_matrix[j] = v;
2983 s->chroma_intra_matrix[j] = v;
2987 if (get_bits1(gb)) {
2988 if (get_bits_left(gb) < 64*8)
2989 return AVERROR_INVALIDDATA;
2990 /* non_intra_quantiser_matrix */
2991 for (i = 0; i < 64; i++) {
2996 if (get_bits1(gb)) {
2997 if (get_bits_left(gb) < 64*8)
2998 return AVERROR_INVALIDDATA;
2999 /* chroma_intra_quantiser_matrix */
3000 for (i = 0; i < 64; i++) {
3001 v = get_bits(gb, 8);
3002 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
3003 s->chroma_intra_matrix[j] = v;
3007 if (get_bits1(gb)) {
3008 if (get_bits_left(gb) < 64*8)
3009 return AVERROR_INVALIDDATA;
3010 /* chroma_non_intra_quantiser_matrix */
3011 for (i = 0; i < 64; i++) {
3016 next_start_code_studio(gb);
3020 static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
3023 uint8_t extension_type;
3025 startcode = show_bits_long(gb, 32);
3026 if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
3028 if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
3029 skip_bits_long(gb, 32);
3030 extension_type = get_bits(gb, 4);
3031 if (extension_type == QUANT_MATRIX_EXT_ID)
3032 read_quant_matrix_ext(s, gb);
3037 static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
3039 MpegEncContext *s = &ctx->m;
3041 skip_bits(gb, 16); /* Time_code[63..48] */
3042 check_marker(s->avctx, gb, "after Time_code[63..48]");
3043 skip_bits(gb, 16); /* Time_code[47..32] */
3044 check_marker(s->avctx, gb, "after Time_code[47..32]");
3045 skip_bits(gb, 16); /* Time_code[31..16] */
3046 check_marker(s->avctx, gb, "after Time_code[31..16]");
3047 skip_bits(gb, 16); /* Time_code[15..0] */
3048 check_marker(s->avctx, gb, "after Time_code[15..0]");
3049 skip_bits(gb, 4); /* reserved_bits */
3053 * Decode the next studio vop header.
3054 * @return <0 if something went wrong
3056 static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3058 MpegEncContext *s = &ctx->m;
3060 if (get_bits_left(gb) <= 32)
3063 s->partitioned_frame = 0;
3064 s->interlaced_dct = 0;
3065 s->decode_mb = mpeg4_decode_studio_mb;
3067 decode_smpte_tc(ctx, gb);
3069 skip_bits(gb, 10); /* temporal_reference */
3070 skip_bits(gb, 2); /* vop_structure */
3071 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
3072 if (get_bits1(gb)) { /* vop_coded */
3073 skip_bits1(gb); /* top_field_first */
3074 skip_bits1(gb); /* repeat_first_field */
3075 s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
3078 if (s->pict_type == AV_PICTURE_TYPE_I) {
3080 reset_studio_dc_predictors(s);
3083 if (ctx->shape != BIN_ONLY_SHAPE) {
3084 s->alternate_scan = get_bits1(gb);
3085 s->frame_pred_frame_dct = get_bits1(gb);
3086 s->dct_precision = get_bits(gb, 2);
3087 s->intra_dc_precision = get_bits(gb, 2);
3088 s->q_scale_type = get_bits1(gb);
3091 if (s->alternate_scan) {
3092 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
3093 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
3094 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
3095 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3097 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
3098 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
3099 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
3100 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
3103 mpeg4_load_default_matrices(s);
3105 next_start_code_studio(gb);
3106 extension_and_user_data(s, gb, 4);
3111 static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
3113 MpegEncContext *s = &ctx->m;
3114 int visual_object_type;
3116 skip_bits(gb, 4); /* visual_object_verid */
3117 visual_object_type = get_bits(gb, 4);
3118 if (visual_object_type != VOT_VIDEO_ID) {
3119 avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
3120 return AVERROR_PATCHWELCOME;
3123 next_start_code_studio(gb);
3124 extension_and_user_data(s, gb, 1);
3129 static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
3131 MpegEncContext *s = &ctx->m;
3133 int bits_per_raw_sample;
3134 int rgb, chroma_format;
3136 // random_accessible_vol and video_object_type_indication have already
3137 // been read by the caller decode_vol_header()
3138 skip_bits(gb, 4); /* video_object_layer_verid */
3139 ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
3140 skip_bits(gb, 4); /* video_object_layer_shape_extension */
3141 skip_bits1(gb); /* progressive_sequence */
3142 if (ctx->shape != RECT_SHAPE) {
3143 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
3144 return AVERROR_PATCHWELCOME;
3146 if (ctx->shape != BIN_ONLY_SHAPE) {
3147 rgb = get_bits1(gb); /* rgb_components */
3148 chroma_format = get_bits(gb, 2); /* chroma_format */
3149 if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
3150 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
3151 return AVERROR_INVALIDDATA;
3154 bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
3155 if (bits_per_raw_sample == 10) {
3157 s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
3160 s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
3164 avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
3165 return AVERROR_PATCHWELCOME;
3167 if (rgb != ctx->rgb || s->chroma_format != chroma_format)
3168 s->context_reinit = 1;
3169 s->avctx->bits_per_raw_sample = bits_per_raw_sample;
3171 s->chroma_format = chroma_format;
3173 if (ctx->shape == RECT_SHAPE) {
3174 check_marker(s->avctx, gb, "before video_object_layer_width");
3175 width = get_bits(gb, 14); /* video_object_layer_width */
3176 check_marker(s->avctx, gb, "before video_object_layer_height");
3177 height = get_bits(gb, 14); /* video_object_layer_height */
3178 check_marker(s->avctx, gb, "after video_object_layer_height");
3180 /* Do the same check as non-studio profile */
3181 if (width && height) {
3182 if (s->width && s->height &&
3183 (s->width != width || s->height != height))
3184 s->context_reinit = 1;
3189 s->aspect_ratio_info = get_bits(gb, 4);
3190 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
3191 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
3192 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
3194 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
3196 skip_bits(gb, 4); /* frame_rate_code */
3197 skip_bits(gb, 15); /* first_half_bit_rate */
3198 check_marker(s->avctx, gb, "after first_half_bit_rate");
3199 skip_bits(gb, 15); /* latter_half_bit_rate */
3200 check_marker(s->avctx, gb, "after latter_half_bit_rate");
3201 skip_bits(gb, 15); /* first_half_vbv_buffer_size */
3202 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3203 skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
3204 skip_bits(gb, 11); /* first_half_vbv_buffer_size */
3205 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
3206 skip_bits(gb, 15); /* latter_half_vbv_occupancy */
3207 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
3208 s->low_delay = get_bits1(gb);
3209 s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
3211 next_start_code_studio(gb);
3212 extension_and_user_data(s, gb, 2);
3218 * Decode MPEG-4 headers.
3220 * @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
3221 * @return <0 if an error occurred
3222 * FRAME_SKIPPED if a not coded VOP is found
3225 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header)
3227 MpegEncContext *s = &ctx->m;
3228 unsigned startcode, v;
3232 /* search next start code */
3235 // If we have not switched to studio profile than we also did not switch bps
3236 // that means something else (like a previous instance) outside set bps which
3237 // would be inconsistant with the currect state, thus reset it
3238 if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
3239 s->avctx->bits_per_raw_sample = 0;
3241 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
3243 if (get_bits(gb, 8) == 0xF0)
3249 if (get_bits_count(gb) >= gb->size_in_bits) {
3250 if (gb->size_in_bits == 8 &&
3251 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
3252 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
3253 return FRAME_SKIPPED; // divx bug
3254 } else if (header && get_bits_count(gb) == gb->size_in_bits) {
3255 return 0; // ordinary return value for parsing of extradata
3257 return AVERROR_INVALIDDATA; // end of stream
3260 /* use the bits after the test */
3261 v = get_bits(gb, 8);
3262 startcode = ((startcode << 8) | v) & 0xffffffff;
3264 if ((startcode & 0xFFFFFF00) != 0x100)
3265 continue; // no startcode
3267 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
3268 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
3269 if (startcode <= 0x11F)
3270 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
3271 else if (startcode <= 0x12F)
3272 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
3273 else if (startcode <= 0x13F)
3274 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3275 else if (startcode <= 0x15F)
3276 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
3277 else if (startcode <= 0x1AF)
3278 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
3279 else if (startcode == 0x1B0)
3280 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
3281 else if (startcode == 0x1B1)
3282 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
3283 else if (startcode == 0x1B2)
3284 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
3285 else if (startcode == 0x1B3)
3286 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
3287 else if (startcode == 0x1B4)
3288 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
3289 else if (startcode == 0x1B5)
3290 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
3291 else if (startcode == 0x1B6)
3292 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
3293 else if (startcode == 0x1B7)
3294 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
3295 else if (startcode == 0x1B8)
3296 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
3297 else if (startcode == 0x1B9)
3298 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
3299 else if (startcode == 0x1BA)
3300 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
3301 else if (startcode == 0x1BB)
3302 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
3303 else if (startcode == 0x1BC)
3304 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
3305 else if (startcode == 0x1BD)
3306 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
3307 else if (startcode == 0x1BE)
3308 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
3309 else if (startcode == 0x1BF)
3310 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
3311 else if (startcode == 0x1C0)
3312 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
3313 else if (startcode == 0x1C1)
3314 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
3315 else if (startcode == 0x1C2)
3316 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
3317 else if (startcode == 0x1C3)
3318 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
3319 else if (startcode <= 0x1C5)
3320 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
3321 else if (startcode <= 0x1FF)
3322 av_log(s->avctx, AV_LOG_DEBUG, "System start");
3323 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
3326 if (startcode >= 0x120 && startcode <= 0x12F) {
3328 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
3332 if ((ret = decode_vol_header(ctx, gb)) < 0)
3334 } else if (startcode == USER_DATA_STARTCODE) {
3335 decode_user_data(ctx, gb);
3336 } else if (startcode == GOP_STARTCODE) {
3337 mpeg4_decode_gop_header(s, gb);
3338 } else if (startcode == VOS_STARTCODE) {
3340 mpeg4_decode_profile_level(s, gb, &profile, &level);
3341 if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
3342 (level > 0 && level < 9)) {
3343 s->studio_profile = 1;
3344 next_start_code_studio(gb);
3345 extension_and_user_data(s, gb, 0);
3346 } else if (s->studio_profile) {
3347 avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
3348 return AVERROR_PATCHWELCOME;
3350 s->avctx->profile = profile;
3351 s->avctx->level = level;
3352 } else if (startcode == VISUAL_OBJ_STARTCODE) {
3353 if (s->studio_profile) {
3354 if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
3357 mpeg4_decode_visual_object(s, gb);
3358 } else if (startcode == VOP_STARTCODE) {
3367 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
3369 s->avctx->has_b_frames = !s->low_delay;
3371 if (s->studio_profile) {
3372 if (!s->avctx->bits_per_raw_sample) {
3373 av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
3374 return AVERROR_INVALIDDATA;
3376 return decode_studio_vop_header(ctx, gb);
3378 return decode_vop_header(ctx, gb);
3381 av_cold void ff_mpeg4videodec_static_init(void) {
3382 static int done = 0;
3385 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
3386 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
3387 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
3388 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
3389 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
3390 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
3391 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
3392 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
3393 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
3394 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
3395 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
3396 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
3397 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
3398 &ff_sprite_trajectory_tab[0][1], 4, 2,
3399 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
3400 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
3401 &ff_mb_type_b_tab[0][1], 2, 1,
3402 &ff_mb_type_b_tab[0][0], 2, 1, 16);
3407 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
3409 Mpeg4DecContext *ctx = avctx->priv_data;
3410 MpegEncContext *s = &ctx->m;
3412 /* divx 5.01+ bitstream reorder stuff */
3413 /* Since this clobbers the input buffer and hwaccel codecs still need the
3414 * data during hwaccel->end_frame we should not do this any earlier */
3415 if (s->divx_packed) {
3416 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
3417 int startcode_found = 0;
3419 if (buf_size - current_pos > 7) {
3422 for (i = current_pos; i < buf_size - 4; i++)
3427 buf[i + 3] == 0xB6) {
3428 startcode_found = !(buf[i + 4] & 0x40);
3433 if (startcode_found) {
3434 if (!ctx->showed_packed_warning) {
3435 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
3436 "wasteful way to store B-frames ('packed B-frames'). "
3437 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
3438 ctx->showed_packed_warning = 1;
3440 av_fast_padded_malloc(&s->bitstream_buffer,
3441 &s->allocated_bitstream_buffer_size,
3442 buf_size - current_pos);
3443 if (!s->bitstream_buffer) {
3444 s->bitstream_buffer_size = 0;
3445 return AVERROR(ENOMEM);
3447 memcpy(s->bitstream_buffer, buf + current_pos,
3448 buf_size - current_pos);
3449 s->bitstream_buffer_size = buf_size - current_pos;
3457 static int mpeg4_update_thread_context(AVCodecContext *dst,
3458 const AVCodecContext *src)
3460 Mpeg4DecContext *s = dst->priv_data;
3461 const Mpeg4DecContext *s1 = src->priv_data;
3462 int init = s->m.context_initialized;
3464 int ret = ff_mpeg_update_thread_context(dst, src);
3469 // copy all the necessary fields explicitly
3470 s->time_increment_bits = s1->time_increment_bits;
3471 s->shape = s1->shape;
3472 s->vol_sprite_usage = s1->vol_sprite_usage;
3473 s->sprite_brightness_change = s1->sprite_brightness_change;
3474 s->num_sprite_warping_points = s1->num_sprite_warping_points;
3476 s->resync_marker = s1->resync_marker;
3477 s->t_frame = s1->t_frame;
3478 s->new_pred = s1->new_pred;
3479 s->enhancement_type = s1->enhancement_type;
3480 s->scalability = s1->scalability;
3481 s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
3482 s->intra_dc_threshold = s1->intra_dc_threshold;
3483 s->divx_version = s1->divx_version;
3484 s->divx_build = s1->divx_build;
3485 s->xvid_build = s1->xvid_build;
3486 s->lavc_build = s1->lavc_build;
3487 s->showed_packed_warning = s1->showed_packed_warning;
3488 s->vol_control_parameters = s1->vol_control_parameters;
3489 s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
3490 s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
3491 s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
3494 memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
3495 memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
3497 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
3498 ff_xvid_idct_init(&s->m.idsp, dst);
3504 static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
3508 for (i = 0; i < 12; i++) {
3509 ret = init_vlc(&ctx->studio_intra_tab[i], STUDIO_INTRA_BITS, 22,
3510 &ff_mpeg4_studio_intra[i][0][1], 4, 2,
3511 &ff_mpeg4_studio_intra[i][0][0], 4, 2,
3518 ret = init_vlc(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
3519 &ff_mpeg4_studio_dc_luma[0][1], 4, 2,
3520 &ff_mpeg4_studio_dc_luma[0][0], 4, 2,
3525 ret = init_vlc(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
3526 &ff_mpeg4_studio_dc_chroma[0][1], 4, 2,
3527 &ff_mpeg4_studio_dc_chroma[0][0], 4, 2,
3535 static av_cold int decode_init(AVCodecContext *avctx)
3537 Mpeg4DecContext *ctx = avctx->priv_data;
3538 MpegEncContext *s = &ctx->m;
3544 ctx->lavc_build = -1;
3546 if ((ret = ff_h263_decode_init(avctx)) < 0)
3549 ff_mpeg4videodec_static_init();
3550 if ((ret = init_studio_vlcs(ctx)) < 0)
3554 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
3555 s->decode_mb = mpeg4_decode_mb;
3556 ctx->time_increment_bits = 4; /* default value for broken headers */
3558 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
3563 static av_cold int decode_end(AVCodecContext *avctx)
3565 Mpeg4DecContext *ctx = avctx->priv_data;
3568 for (i = 0; i < 12; i++)
3569 ff_free_vlc(&ctx->studio_intra_tab[i]);
3571 ff_free_vlc(&ctx->studio_luma_dc);
3572 ff_free_vlc(&ctx->studio_chroma_dc);
3574 return ff_h263_decode_end(avctx);
3577 static const AVOption mpeg4_options[] = {
3578 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3579 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
3583 static const AVClass mpeg4_class = {
3584 .class_name = "MPEG4 Video Decoder",
3585 .item_name = av_default_item_name,
3586 .option = mpeg4_options,
3587 .version = LIBAVUTIL_VERSION_INT,
3590 AVCodec ff_mpeg4_decoder = {
3592 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
3593 .type = AVMEDIA_TYPE_VIDEO,
3594 .id = AV_CODEC_ID_MPEG4,
3595 .priv_data_size = sizeof(Mpeg4DecContext),
3596 .init = decode_init,
3597 .close = decode_end,
3598 .decode = ff_h263_decode_frame,
3599 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
3600 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
3601 AV_CODEC_CAP_FRAME_THREADS,
3602 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
3603 FF_CODEC_CAP_ALLOCATE_PROGRESS |
3604 FF_CODEC_CAP_INIT_CLEANUP,
3605 .flush = ff_mpeg_flush,
3607 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
3608 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
3609 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
3610 .priv_class = &mpeg4_class,
3611 .hw_configs = (const AVCodecHWConfigInternal*[]) {
3612 #if CONFIG_MPEG4_NVDEC_HWACCEL
3613 HWACCEL_NVDEC(mpeg4),
3615 #if CONFIG_MPEG4_VAAPI_HWACCEL
3616 HWACCEL_VAAPI(mpeg4),
3618 #if CONFIG_MPEG4_VDPAU_HWACCEL
3619 HWACCEL_VDPAU(mpeg4),
3621 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
3622 HWACCEL_VIDEOTOOLBOX(mpeg4),