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 "error_resilience.h"
31 #include "mpegutils.h"
32 #include "mpegvideo.h"
33 #include "mpegvideodata.h"
34 #include "mpeg4video.h"
40 /* The defines below define the number of bits that are read at once for
41 * reading vlc values. Changing these may improve speed and data cache needs
42 * be aware though that decreasing them may need the number of stages that is
43 * passed to get_vlc* to be increased. */
44 #define SPRITE_TRAJ_VLC_BITS 6
46 #define MB_TYPE_B_VLC_BITS 4
48 static VLC dc_lum, dc_chrom;
49 static VLC sprite_trajectory;
50 static VLC mb_type_b_vlc;
52 static const int mb_type_b_map[4] = {
53 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
54 MB_TYPE_L0L1 | MB_TYPE_16x16,
55 MB_TYPE_L1 | MB_TYPE_16x16,
56 MB_TYPE_L0 | MB_TYPE_16x16,
61 * @param n block index (0-3 are luma, 4-5 are chroma)
62 * @param dir the ac prediction direction
64 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
67 int16_t *ac_val, *ac_val1;
68 int8_t *const qscale_table = s->current_picture.qscale_table;
71 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
75 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
79 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
82 for (i = 1; i < 8; i++)
83 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
85 /* different qscale, we must rescale */
86 for (i = 1; i < 8; i++)
87 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
90 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
92 ac_val -= 16 * s->block_wrap[n];
94 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
97 for (i = 1; i < 8; i++)
98 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
100 /* different qscale, we must rescale */
101 for (i = 1; i < 8; i++)
102 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
107 for (i = 1; i < 8; i++)
108 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
111 for (i = 1; i < 8; i++)
112 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
116 * check if the next stuff is a resync marker or the end.
119 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
121 MpegEncContext *s = &ctx->m;
122 int bits_count = get_bits_count(&s->gb);
123 int v = show_bits(&s->gb, 16);
125 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
129 if (s->pict_type == AV_PICTURE_TYPE_B ||
130 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
132 skip_bits(&s->gb, 8 + s->pict_type);
133 bits_count += 8 + s->pict_type;
134 v = show_bits(&s->gb, 16);
137 if (bits_count + 8 >= s->gb.size_in_bits) {
139 v |= 0x7F >> (7 - (bits_count & 7));
144 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
146 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
147 GetBitContext gb = s->gb;
149 skip_bits(&s->gb, 1);
150 align_get_bits(&s->gb);
152 for (len = 0; len < 32; len++)
153 if (get_bits1(&s->gb))
156 mb_num = get_bits(&s->gb, mb_num_bits);
157 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
162 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
169 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
171 MpegEncContext *s = &ctx->m;
172 int a = 2 << s->sprite_warping_accuracy;
173 int rho = 3 - s->sprite_warping_accuracy;
179 int min_ab, i, w2, h2, w3, h3;
180 int sprite_ref[4][2];
181 int virtual_ref[2][2];
182 int64_t sprite_offset[2][2];
183 int64_t sprite_delta[2][2];
185 // only true for rectangle shapes
186 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
187 { 0, s->height }, { s->width, s->height } };
188 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
190 if (w <= 0 || h <= 0)
191 return AVERROR_INVALIDDATA;
193 /* the decoder was not properly initialized and we cannot continue */
194 if (sprite_trajectory.table == NULL)
195 return AVERROR_INVALIDDATA;
197 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
201 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
203 x = get_xbits(gb, length);
205 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
206 check_marker(s->avctx, gb, "before sprite_trajectory");
208 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
210 y = get_xbits(gb, length);
212 check_marker(s->avctx, gb, "after sprite_trajectory");
213 ctx->sprite_traj[i][0] = d[i][0] = x;
214 ctx->sprite_traj[i][1] = d[i][1] = y;
217 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
219 while ((1 << alpha) < w)
221 while ((1 << beta) < h)
222 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
226 // Note, the 4th point isn't used for GMC
227 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
228 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
229 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
230 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
231 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
232 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
233 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
235 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
236 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
237 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
238 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
239 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
240 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
242 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
243 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
245 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
246 * because of that...). Perhaps it should be reordered to be more readable.
247 * The idea behind this virtual_ref mess is to be able to use shifts later
248 * per pixel instead of divides so the distance between points is converted
249 * from w&h based to w2&h2 based which are of the 2^x form. */
250 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
251 ROUNDED_DIV(((w - w2) *
252 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
253 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
254 virtual_ref[0][1] = 16 * vop_ref[0][1] +
255 ROUNDED_DIV(((w - w2) *
256 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
257 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
258 virtual_ref[1][0] = 16 * vop_ref[0][0] +
259 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
260 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
261 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
262 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
263 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
265 switch (ctx->num_sprite_warping_points) {
267 sprite_offset[0][0] =
268 sprite_offset[0][1] =
269 sprite_offset[1][0] =
270 sprite_offset[1][1] = 0;
271 sprite_delta[0][0] = a;
273 sprite_delta[1][0] = 0;
274 sprite_delta[1][1] = a;
275 ctx->sprite_shift[0] =
276 ctx->sprite_shift[1] = 0;
279 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
280 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
281 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
282 a * (vop_ref[0][0] / 2);
283 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
284 a * (vop_ref[0][1] / 2);
285 sprite_delta[0][0] = a;
287 sprite_delta[1][0] = 0;
288 sprite_delta[1][1] = a;
289 ctx->sprite_shift[0] =
290 ctx->sprite_shift[1] = 0;
293 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
294 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
295 ((int64_t) -vop_ref[0][0]) +
296 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
297 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
298 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
299 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
300 ((int64_t) -vop_ref[0][0]) +
301 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
302 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
303 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304 ((int64_t)-2 * vop_ref[0][0] + 1) +
305 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
306 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
307 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
308 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
309 ((int64_t)-2 * vop_ref[0][0] + 1) +
310 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
311 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
312 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
313 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
314 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
315 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
316 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
318 ctx->sprite_shift[0] = alpha + rho;
319 ctx->sprite_shift[1] = alpha + rho + 2;
322 min_ab = FFMIN(alpha, beta);
325 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
326 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
327 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
328 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
329 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
330 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
331 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
332 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
333 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
334 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
335 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
336 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
337 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
338 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
339 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
340 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
341 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
342 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
343 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
344 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
346 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
347 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
350 /* try to simplify the situation */
351 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
352 sprite_delta[0][1] == 0 &&
353 sprite_delta[1][0] == 0 &&
354 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
355 sprite_offset[0][0] >>= ctx->sprite_shift[0];
356 sprite_offset[0][1] >>= ctx->sprite_shift[0];
357 sprite_offset[1][0] >>= ctx->sprite_shift[1];
358 sprite_offset[1][1] >>= ctx->sprite_shift[1];
359 sprite_delta[0][0] = a;
360 sprite_delta[0][1] = 0;
361 sprite_delta[1][0] = 0;
362 sprite_delta[1][1] = a;
363 ctx->sprite_shift[0] = 0;
364 ctx->sprite_shift[1] = 0;
365 s->real_sprite_warping_points = 1;
367 int shift_y = 16 - ctx->sprite_shift[0];
368 int shift_c = 16 - ctx->sprite_shift[1];
370 for (i = 0; i < 2; i++) {
371 if (shift_c < 0 || shift_y < 0 ||
372 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
373 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
374 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
375 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
377 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
382 for (i = 0; i < 2; i++) {
383 sprite_offset[0][i] *= 1 << shift_y;
384 sprite_offset[1][i] *= 1 << shift_c;
385 sprite_delta[0][i] *= 1 << shift_y;
386 sprite_delta[1][i] *= 1 << shift_y;
387 ctx->sprite_shift[i] = 16;
390 for (i = 0; i < 2; i++) {
392 sprite_delta[i][0] - a * (1LL<<16),
393 sprite_delta[i][1] - a * (1LL<<16)
396 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
397 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
398 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
399 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
400 llabs(sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
401 llabs(sd[0]) >= INT_MAX ||
402 llabs(sd[1]) >= INT_MAX ||
403 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
404 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
405 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
407 avpriv_request_sample(s->avctx, "Overflow on sprite points");
411 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
414 for (i = 0; i < 4; i++) {
415 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
416 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
421 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
422 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
423 return AVERROR_PATCHWELCOME;
426 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
427 MpegEncContext *s = &ctx->m;
428 int len = FFMIN(ctx->time_increment_bits + 3, 15);
433 check_marker(s->avctx, gb, "after new_pred");
439 * Decode the next video packet.
440 * @return <0 if something went wrong
442 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
444 MpegEncContext *s = &ctx->m;
446 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
447 int header_extension = 0, mb_num, len;
449 /* is there enough space left for a video packet + header */
450 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
453 for (len = 0; len < 32; len++)
454 if (get_bits1(&s->gb))
457 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
458 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
462 if (ctx->shape != RECT_SHAPE) {
463 header_extension = get_bits1(&s->gb);
464 // FIXME more stuff here
467 mb_num = get_bits(&s->gb, mb_num_bits);
468 if (mb_num >= s->mb_num || !mb_num) {
469 av_log(s->avctx, AV_LOG_ERROR,
470 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
474 s->mb_x = mb_num % s->mb_width;
475 s->mb_y = mb_num / s->mb_width;
477 if (ctx->shape != BIN_ONLY_SHAPE) {
478 int qscale = get_bits(&s->gb, s->quant_precision);
480 s->chroma_qscale = s->qscale = qscale;
483 if (ctx->shape == RECT_SHAPE)
484 header_extension = get_bits1(&s->gb);
486 if (header_extension) {
489 while (get_bits1(&s->gb) != 0)
492 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
493 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
494 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
496 skip_bits(&s->gb, 2); /* vop coding type */
497 // FIXME not rect stuff here
499 if (ctx->shape != BIN_ONLY_SHAPE) {
500 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
501 // FIXME don't just ignore everything
502 if (s->pict_type == AV_PICTURE_TYPE_S &&
503 ctx->vol_sprite_usage == GMC_SPRITE) {
504 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
505 return AVERROR_INVALIDDATA;
506 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
509 // FIXME reduced res stuff here
511 if (s->pict_type != AV_PICTURE_TYPE_I) {
512 int f_code = get_bits(&s->gb, 3); /* fcode_for */
514 av_log(s->avctx, AV_LOG_ERROR,
515 "Error, video packet header damaged (f_code=0)\n");
517 if (s->pict_type == AV_PICTURE_TYPE_B) {
518 int b_code = get_bits(&s->gb, 3);
520 av_log(s->avctx, AV_LOG_ERROR,
521 "Error, video packet header damaged (b_code=0)\n");
526 decode_new_pred(ctx, &s->gb);
532 * Get the average motion vector for a GMC MB.
533 * @param n either 0 for the x component or 1 for y
534 * @return the average MV for a GMC MB
536 static inline int get_amv(Mpeg4DecContext *ctx, int n)
538 MpegEncContext *s = &ctx->m;
539 int x, y, mb_v, sum, dx, dy, shift;
540 int len = 1 << (s->f_code + 4);
541 const int a = s->sprite_warping_accuracy;
543 if (s->workaround_bugs & FF_BUG_AMV)
544 len >>= s->quarter_sample;
546 if (s->real_sprite_warping_points == 1) {
547 if (ctx->divx_version == 500 && ctx->divx_build == 413)
548 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
550 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
552 dx = s->sprite_delta[n][0];
553 dy = s->sprite_delta[n][1];
554 shift = ctx->sprite_shift[0];
556 dy -= 1 << (shift + a + 1);
558 dx -= 1 << (shift + a + 1);
559 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
562 for (y = 0; y < 16; y++) {
567 for (x = 0; x < 16; x++) {
572 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
584 * Decode the dc value.
585 * @param n block index (0-3 are luma, 4-5 are chroma)
586 * @param dir_ptr the prediction direction will be stored here
587 * @return the quantized dc
589 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
594 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
596 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
598 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
599 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
608 level = 2 * get_bits1(&s->gb) - 1;
610 if (get_bits1(&s->gb))
611 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
613 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
616 level = get_xbits(&s->gb, code);
620 if (get_bits1(&s->gb) == 0) { /* marker */
621 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
622 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
629 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
633 * Decode first partition.
634 * @return number of MBs decoded or <0 if an error occurred
636 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
638 MpegEncContext *s = &ctx->m;
640 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
642 /* decode first partition */
643 s->first_slice_line = 1;
644 for (; s->mb_y < s->mb_height; s->mb_y++) {
645 ff_init_block_index(s);
646 for (; s->mb_x < s->mb_width; s->mb_x++) {
647 const int xy = s->mb_x + s->mb_y * s->mb_stride;
652 ff_update_block_index(s);
653 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
654 s->first_slice_line = 0;
656 if (s->pict_type == AV_PICTURE_TYPE_I) {
660 if (show_bits_long(&s->gb, 19) == DC_MARKER)
663 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
665 av_log(s->avctx, AV_LOG_ERROR,
666 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
671 s->cbp_table[xy] = cbpc & 3;
672 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
676 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
678 s->current_picture.qscale_table[xy] = s->qscale;
680 s->mbintra_table[xy] = 1;
681 for (i = 0; i < 6; i++) {
683 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
685 av_log(s->avctx, AV_LOG_ERROR,
686 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
693 s->pred_dir_table[xy] = dir;
694 } else { /* P/S_TYPE */
695 int mx, my, pred_x, pred_y, bits;
696 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
697 const int stride = s->b8_stride * 2;
700 bits = show_bits(&s->gb, 17);
701 if (bits == MOTION_MARKER)
705 if (bits & 0x10000) {
707 if (s->pict_type == AV_PICTURE_TYPE_S &&
708 ctx->vol_sprite_usage == GMC_SPRITE) {
709 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
713 mx = get_amv(ctx, 0);
714 my = get_amv(ctx, 1);
716 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
723 mot_val[0 + stride] =
724 mot_val[2 + stride] = mx;
727 mot_val[1 + stride] =
728 mot_val[3 + stride] = my;
730 if (s->mbintra_table[xy])
731 ff_clean_intra_table_entries(s);
735 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
737 av_log(s->avctx, AV_LOG_ERROR,
738 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
744 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
746 s->mb_intra = ((cbpc & 4) != 0);
749 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
750 s->mbintra_table[xy] = 1;
753 mot_val[0 + stride] =
754 mot_val[2 + stride] = 0;
757 mot_val[1 + stride] =
758 mot_val[3 + stride] = 0;
760 if (s->mbintra_table[xy])
761 ff_clean_intra_table_entries(s);
763 if (s->pict_type == AV_PICTURE_TYPE_S &&
764 ctx->vol_sprite_usage == GMC_SPRITE &&
766 s->mcsel = get_bits1(&s->gb);
770 if ((cbpc & 16) == 0) {
771 /* 16x16 motion prediction */
773 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
775 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
779 my = ff_h263_decode_motion(s, pred_y, s->f_code);
782 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
785 mx = get_amv(ctx, 0);
786 my = get_amv(ctx, 1);
787 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
794 mot_val[0 + stride] =
795 mot_val[2 + stride] = mx;
798 mot_val[1 + stride] =
799 mot_val[3 + stride] = my;
802 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
804 for (i = 0; i < 4; i++) {
805 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
806 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
810 my = ff_h263_decode_motion(s, pred_y, s->f_code);
827 * decode second partition.
828 * @return <0 if an error occurred
830 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
833 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
835 s->mb_x = s->resync_mb_x;
836 s->first_slice_line = 1;
837 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
838 ff_init_block_index(s);
839 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
840 const int xy = s->mb_x + s->mb_y * s->mb_stride;
843 ff_update_block_index(s);
844 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
845 s->first_slice_line = 0;
847 if (s->pict_type == AV_PICTURE_TYPE_I) {
848 int ac_pred = get_bits1(&s->gb);
849 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
851 av_log(s->avctx, AV_LOG_ERROR,
852 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
856 s->cbp_table[xy] |= cbpy << 2;
857 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
858 } else { /* P || S_TYPE */
859 if (IS_INTRA(s->current_picture.mb_type[xy])) {
862 int ac_pred = get_bits1(&s->gb);
863 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
866 av_log(s->avctx, AV_LOG_ERROR,
867 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
871 if (s->cbp_table[xy] & 8)
872 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
873 s->current_picture.qscale_table[xy] = s->qscale;
875 for (i = 0; i < 6; i++) {
877 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
879 av_log(s->avctx, AV_LOG_ERROR,
880 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
887 s->cbp_table[xy] &= 3; // remove dquant
888 s->cbp_table[xy] |= cbpy << 2;
889 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
890 s->pred_dir_table[xy] = dir;
891 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
892 s->current_picture.qscale_table[xy] = s->qscale;
893 s->cbp_table[xy] = 0;
895 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
898 av_log(s->avctx, AV_LOG_ERROR,
899 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
903 if (s->cbp_table[xy] & 8)
904 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
905 s->current_picture.qscale_table[xy] = s->qscale;
907 s->cbp_table[xy] &= 3; // remove dquant
908 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
912 if (mb_num >= mb_count)
920 * Decode the first and second partition.
921 * @return <0 if error (and sets error type in the error_status_table)
923 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
925 MpegEncContext *s = &ctx->m;
927 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
928 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
930 mb_num = mpeg4_decode_partition_a(ctx);
932 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
933 s->mb_x, s->mb_y, part_a_error);
937 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
938 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
939 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
940 s->mb_x, s->mb_y, part_a_error);
944 s->mb_num_left = mb_num;
946 if (s->pict_type == AV_PICTURE_TYPE_I) {
947 while (show_bits(&s->gb, 9) == 1)
948 skip_bits(&s->gb, 9);
949 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
950 av_log(s->avctx, AV_LOG_ERROR,
951 "marker missing after first I partition at %d %d\n",
956 while (show_bits(&s->gb, 10) == 1)
957 skip_bits(&s->gb, 10);
958 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
959 av_log(s->avctx, AV_LOG_ERROR,
960 "marker missing after first P partition at %d %d\n",
965 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
966 s->mb_x - 1, s->mb_y, part_a_end);
968 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
969 if (s->pict_type == AV_PICTURE_TYPE_P)
970 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
971 s->mb_x, s->mb_y, ER_DC_ERROR);
974 if (s->pict_type == AV_PICTURE_TYPE_P)
975 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
976 s->mb_x - 1, s->mb_y, ER_DC_END);
984 * @return <0 if an error occurred
986 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
987 int n, int coded, int intra, int rvlc)
989 MpegEncContext *s = &ctx->m;
990 int level, i, last, run, qmul, qadd;
991 int av_uninit(dc_pred_dir);
994 const uint8_t *scan_table;
996 // Note intra & rvlc should be optimized away if this is inlined
999 if (ctx->use_intra_dc_vlc) {
1001 if (s->partitioned_frame) {
1002 level = s->dc_val[0][s->block_index[n]];
1004 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1006 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1007 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1009 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1017 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1023 rl = &ff_rvlc_rl_intra;
1024 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1026 rl = &ff_mpeg4_rl_intra;
1027 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1030 if (dc_pred_dir == 0)
1031 scan_table = s->intra_v_scantable.permutated; /* left */
1033 scan_table = s->intra_h_scantable.permutated; /* top */
1035 scan_table = s->intra_scantable.permutated;
1042 s->block_last_index[n] = i;
1046 rl = &ff_rvlc_rl_inter;
1048 rl = &ff_h263_rl_inter;
1050 scan_table = s->intra_scantable.permutated;
1052 if (s->mpeg_quant) {
1056 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1058 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1060 qmul = s->qscale << 1;
1061 qadd = (s->qscale - 1) | 1;
1063 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1065 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1069 OPEN_READER(re, &s->gb);
1071 UPDATE_CACHE(re, &s->gb);
1072 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1076 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1077 av_log(s->avctx, AV_LOG_ERROR,
1078 "1. marker bit missing in rvlc esc\n");
1081 SKIP_CACHE(re, &s->gb, 1);
1083 last = SHOW_UBITS(re, &s->gb, 1);
1084 SKIP_CACHE(re, &s->gb, 1);
1085 run = SHOW_UBITS(re, &s->gb, 6);
1086 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1087 UPDATE_CACHE(re, &s->gb);
1089 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1090 av_log(s->avctx, AV_LOG_ERROR,
1091 "2. marker bit missing in rvlc esc\n");
1094 SKIP_CACHE(re, &s->gb, 1);
1096 level = SHOW_UBITS(re, &s->gb, 11);
1097 SKIP_CACHE(re, &s->gb, 11);
1099 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1100 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1103 SKIP_CACHE(re, &s->gb, 5);
1105 level = level * qmul + qadd;
1106 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1107 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1114 cache = GET_CACHE(re, &s->gb);
1117 cache ^= 0xC0000000;
1119 if (cache & 0x80000000) {
1120 if (cache & 0x40000000) {
1122 SKIP_CACHE(re, &s->gb, 2);
1123 last = SHOW_UBITS(re, &s->gb, 1);
1124 SKIP_CACHE(re, &s->gb, 1);
1125 run = SHOW_UBITS(re, &s->gb, 6);
1126 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1127 UPDATE_CACHE(re, &s->gb);
1130 level = SHOW_SBITS(re, &s->gb, 12);
1131 LAST_SKIP_BITS(re, &s->gb, 12);
1133 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1134 av_log(s->avctx, AV_LOG_ERROR,
1135 "1. marker bit missing in 3. esc\n");
1136 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1139 SKIP_CACHE(re, &s->gb, 1);
1141 level = SHOW_SBITS(re, &s->gb, 12);
1142 SKIP_CACHE(re, &s->gb, 12);
1144 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1145 av_log(s->avctx, AV_LOG_ERROR,
1146 "2. marker bit missing in 3. esc\n");
1147 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1151 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1155 if (s->error_recognition >= FF_ER_COMPLIANT) {
1156 const int abs_level= FFABS(level);
1157 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1158 const int run1= run - rl->max_run[last][abs_level] - 1;
1159 if (abs_level <= rl->max_level[last][run]) {
1160 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1163 if (s->error_recognition > FF_ER_COMPLIANT) {
1164 if (abs_level <= rl->max_level[last][run]*2) {
1165 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1168 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1169 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1177 level = level * qmul + qadd;
1179 level = level * qmul - qadd;
1181 if ((unsigned)(level + 2048) > 4095) {
1182 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1183 if (level > 2560 || level < -2560) {
1184 av_log(s->avctx, AV_LOG_ERROR,
1185 "|level| overflow in 3. esc, qp=%d\n",
1190 level = level < 0 ? -2048 : 2047;
1198 SKIP_BITS(re, &s->gb, 2);
1199 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1200 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1201 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1202 LAST_SKIP_BITS(re, &s->gb, 1);
1206 SKIP_BITS(re, &s->gb, 1);
1207 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1209 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1210 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1211 LAST_SKIP_BITS(re, &s->gb, 1);
1216 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1217 LAST_SKIP_BITS(re, &s->gb, 1);
1219 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1223 av_log(s->avctx, AV_LOG_ERROR,
1224 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1228 block[scan_table[i]] = level;
1232 block[scan_table[i]] = level;
1234 CLOSE_READER(re, &s->gb);
1239 if (!ctx->use_intra_dc_vlc) {
1240 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1242 i -= i >> 31; // if (i == -1) i = 0;
1245 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1247 i = 63; // FIXME not optimal
1249 s->block_last_index[n] = i;
1254 * decode partition C of one MB.
1255 * @return <0 if an error occurred
1257 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1259 Mpeg4DecContext *ctx = s->avctx->priv_data;
1261 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1263 av_assert2(s == (void*)ctx);
1265 mb_type = s->current_picture.mb_type[xy];
1266 cbp = s->cbp_table[xy];
1268 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1270 if (s->current_picture.qscale_table[xy] != s->qscale)
1271 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1273 if (s->pict_type == AV_PICTURE_TYPE_P ||
1274 s->pict_type == AV_PICTURE_TYPE_S) {
1276 for (i = 0; i < 4; i++) {
1277 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1278 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1280 s->mb_intra = IS_INTRA(mb_type);
1282 if (IS_SKIP(mb_type)) {
1284 for (i = 0; i < 6; i++)
1285 s->block_last_index[i] = -1;
1286 s->mv_dir = MV_DIR_FORWARD;
1287 s->mv_type = MV_TYPE_16X16;
1288 if (s->pict_type == AV_PICTURE_TYPE_S
1289 && ctx->vol_sprite_usage == GMC_SPRITE) {
1296 } else if (s->mb_intra) {
1297 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1298 } else if (!s->mb_intra) {
1299 // s->mcsel = 0; // FIXME do we need to init that?
1301 s->mv_dir = MV_DIR_FORWARD;
1302 if (IS_8X8(mb_type)) {
1303 s->mv_type = MV_TYPE_8X8;
1305 s->mv_type = MV_TYPE_16X16;
1308 } else { /* I-Frame */
1310 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1313 if (!IS_SKIP(mb_type)) {
1315 s->bdsp.clear_blocks(s->block[0]);
1316 /* decode each block */
1317 for (i = 0; i < 6; i++) {
1318 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1319 av_log(s->avctx, AV_LOG_ERROR,
1320 "texture corrupted at %d %d %d\n",
1321 s->mb_x, s->mb_y, s->mb_intra);
1328 /* per-MB end of slice check */
1329 if (--s->mb_num_left <= 0) {
1330 if (mpeg4_is_resync(ctx))
1335 if (mpeg4_is_resync(ctx)) {
1336 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1337 if (s->cbp_table[xy + delta])
1344 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1346 Mpeg4DecContext *ctx = s->avctx->priv_data;
1347 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1349 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1350 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1352 av_assert2(s == (void*)ctx);
1353 av_assert2(s->h263_pred);
1355 if (s->pict_type == AV_PICTURE_TYPE_P ||
1356 s->pict_type == AV_PICTURE_TYPE_S) {
1358 if (get_bits1(&s->gb)) {
1361 for (i = 0; i < 6; i++)
1362 s->block_last_index[i] = -1;
1363 s->mv_dir = MV_DIR_FORWARD;
1364 s->mv_type = MV_TYPE_16X16;
1365 if (s->pict_type == AV_PICTURE_TYPE_S &&
1366 ctx->vol_sprite_usage == GMC_SPRITE) {
1367 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1372 s->mv[0][0][0] = get_amv(ctx, 0);
1373 s->mv[0][0][1] = get_amv(ctx, 1);
1376 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1386 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1388 av_log(s->avctx, AV_LOG_ERROR,
1389 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1392 } while (cbpc == 20);
1394 s->bdsp.clear_blocks(s->block[0]);
1396 s->mb_intra = ((cbpc & 4) != 0);
1400 if (s->pict_type == AV_PICTURE_TYPE_S &&
1401 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1402 s->mcsel = get_bits1(&s->gb);
1405 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1407 av_log(s->avctx, AV_LOG_ERROR,
1408 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1409 return AVERROR_INVALIDDATA;
1412 cbp = (cbpc & 3) | (cbpy << 2);
1414 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1415 if ((!s->progressive_sequence) &&
1416 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1417 s->interlaced_dct = get_bits1(&s->gb);
1419 s->mv_dir = MV_DIR_FORWARD;
1420 if ((cbpc & 16) == 0) {
1422 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1425 /* 16x16 global motion prediction */
1426 s->mv_type = MV_TYPE_16X16;
1427 mx = get_amv(ctx, 0);
1428 my = get_amv(ctx, 1);
1429 s->mv[0][0][0] = mx;
1430 s->mv[0][0][1] = my;
1431 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1432 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1435 /* 16x8 field motion prediction */
1436 s->mv_type = MV_TYPE_FIELD;
1438 s->field_select[0][0] = get_bits1(&s->gb);
1439 s->field_select[0][1] = get_bits1(&s->gb);
1441 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1443 for (i = 0; i < 2; i++) {
1444 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1448 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1452 s->mv[0][i][0] = mx;
1453 s->mv[0][i][1] = my;
1456 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1457 /* 16x16 motion prediction */
1458 s->mv_type = MV_TYPE_16X16;
1459 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1460 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1465 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1469 s->mv[0][0][0] = mx;
1470 s->mv[0][0][1] = my;
1473 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1474 s->mv_type = MV_TYPE_8X8;
1475 for (i = 0; i < 4; i++) {
1476 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1477 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1481 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1484 s->mv[0][i][0] = mx;
1485 s->mv[0][i][1] = my;
1490 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1491 int modb1; // first bit of modb
1492 int modb2; // second bit of modb
1495 s->mb_intra = 0; // B-frames never contain intra blocks
1496 s->mcsel = 0; // ... true gmc blocks
1499 for (i = 0; i < 2; i++) {
1500 s->last_mv[i][0][0] =
1501 s->last_mv[i][0][1] =
1502 s->last_mv[i][1][0] =
1503 s->last_mv[i][1][1] = 0;
1506 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1509 /* if we skipped it in the future P-frame than skip it now too */
1510 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1512 if (s->mb_skipped) {
1514 for (i = 0; i < 6; i++)
1515 s->block_last_index[i] = -1;
1517 s->mv_dir = MV_DIR_FORWARD;
1518 s->mv_type = MV_TYPE_16X16;
1523 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1529 modb1 = get_bits1(&s->gb);
1531 // like MB_TYPE_B_DIRECT but no vectors coded
1532 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1535 modb2 = get_bits1(&s->gb);
1536 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1538 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1541 mb_type = mb_type_b_map[mb_type];
1545 s->bdsp.clear_blocks(s->block[0]);
1546 cbp = get_bits(&s->gb, 6);
1549 if ((!IS_DIRECT(mb_type)) && cbp) {
1550 if (get_bits1(&s->gb))
1551 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1554 if (!s->progressive_sequence) {
1556 s->interlaced_dct = get_bits1(&s->gb);
1558 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1559 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1560 mb_type &= ~MB_TYPE_16x16;
1562 if (USES_LIST(mb_type, 0)) {
1563 s->field_select[0][0] = get_bits1(&s->gb);
1564 s->field_select[0][1] = get_bits1(&s->gb);
1566 if (USES_LIST(mb_type, 1)) {
1567 s->field_select[1][0] = get_bits1(&s->gb);
1568 s->field_select[1][1] = get_bits1(&s->gb);
1574 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1575 s->mv_type = MV_TYPE_16X16;
1577 if (USES_LIST(mb_type, 0)) {
1578 s->mv_dir = MV_DIR_FORWARD;
1580 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1581 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1582 s->last_mv[0][1][0] =
1583 s->last_mv[0][0][0] =
1584 s->mv[0][0][0] = mx;
1585 s->last_mv[0][1][1] =
1586 s->last_mv[0][0][1] =
1587 s->mv[0][0][1] = my;
1590 if (USES_LIST(mb_type, 1)) {
1591 s->mv_dir |= MV_DIR_BACKWARD;
1593 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1594 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1595 s->last_mv[1][1][0] =
1596 s->last_mv[1][0][0] =
1597 s->mv[1][0][0] = mx;
1598 s->last_mv[1][1][1] =
1599 s->last_mv[1][0][1] =
1600 s->mv[1][0][1] = my;
1602 } else if (!IS_DIRECT(mb_type)) {
1603 s->mv_type = MV_TYPE_FIELD;
1605 if (USES_LIST(mb_type, 0)) {
1606 s->mv_dir = MV_DIR_FORWARD;
1608 for (i = 0; i < 2; i++) {
1609 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1610 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1611 s->last_mv[0][i][0] =
1612 s->mv[0][i][0] = mx;
1613 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1617 if (USES_LIST(mb_type, 1)) {
1618 s->mv_dir |= MV_DIR_BACKWARD;
1620 for (i = 0; i < 2; i++) {
1621 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1622 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1623 s->last_mv[1][i][0] =
1624 s->mv[1][i][0] = mx;
1625 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1631 if (IS_DIRECT(mb_type)) {
1632 if (IS_SKIP(mb_type)) {
1636 mx = ff_h263_decode_motion(s, 0, 1);
1637 my = ff_h263_decode_motion(s, 0, 1);
1640 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1641 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1643 s->current_picture.mb_type[xy] = mb_type;
1644 } else { /* I-Frame */
1646 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1648 av_log(s->avctx, AV_LOG_ERROR,
1649 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1652 } while (cbpc == 8);
1658 s->ac_pred = get_bits1(&s->gb);
1660 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1662 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1664 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1666 av_log(s->avctx, AV_LOG_ERROR,
1667 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1670 cbp = (cbpc & 3) | (cbpy << 2);
1672 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1675 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1677 if (!s->progressive_sequence)
1678 s->interlaced_dct = get_bits1(&s->gb);
1680 s->bdsp.clear_blocks(s->block[0]);
1681 /* decode each block */
1682 for (i = 0; i < 6; i++) {
1683 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1690 /* decode each block */
1691 for (i = 0; i < 6; i++) {
1692 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1698 /* per-MB end of slice check */
1699 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1700 int next = mpeg4_is_resync(ctx);
1702 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1704 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1707 if (s->pict_type == AV_PICTURE_TYPE_B) {
1708 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1709 ff_thread_await_progress(&s->next_picture_ptr->tf,
1710 (s->mb_x + delta >= s->mb_width)
1711 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1713 if (s->next_picture.mbskip_table[xy + delta])
1724 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1726 int hours, minutes, seconds;
1728 if (!show_bits(gb, 23)) {
1729 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1733 hours = get_bits(gb, 5);
1734 minutes = get_bits(gb, 6);
1735 check_marker(s->avctx, gb, "in gop_header");
1736 seconds = get_bits(gb, 6);
1738 s->time_base = seconds + 60*(minutes + 60*hours);
1746 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1749 s->avctx->profile = get_bits(gb, 4);
1750 s->avctx->level = get_bits(gb, 4);
1752 // for Simple profile, level 0
1753 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1754 s->avctx->level = 0;
1760 static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
1762 int visual_object_type;
1763 int is_visual_object_identifier = get_bits1(gb);
1765 if (is_visual_object_identifier) {
1768 visual_object_type = get_bits(gb, 4);
1770 if (visual_object_type == VOT_VIDEO_ID ||
1771 visual_object_type == VOT_STILL_TEXTURE_ID) {
1772 int video_signal_type = get_bits1(gb);
1773 if (video_signal_type) {
1774 int video_range, color_description;
1775 skip_bits(gb, 3); // video_format
1776 video_range = get_bits1(gb);
1777 color_description = get_bits1(gb);
1779 s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
1781 if (color_description) {
1782 s->avctx->color_primaries = get_bits(gb, 8);
1783 s->avctx->color_trc = get_bits(gb, 8);
1784 s->avctx->colorspace = get_bits(gb, 8);
1792 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1794 MpegEncContext *s = &ctx->m;
1795 int width, height, vo_ver_id;
1798 skip_bits(gb, 1); /* random access */
1799 s->vo_type = get_bits(gb, 8);
1800 if (get_bits1(gb) != 0) { /* is_ol_id */
1801 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1802 skip_bits(gb, 3); /* vo_priority */
1806 s->aspect_ratio_info = get_bits(gb, 4);
1807 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1808 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1809 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1811 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1814 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1815 int chroma_format = get_bits(gb, 2);
1816 if (chroma_format != CHROMA_420)
1817 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1819 s->low_delay = get_bits1(gb);
1820 if (get_bits1(gb)) { /* vbv parameters */
1821 get_bits(gb, 15); /* first_half_bitrate */
1822 check_marker(s->avctx, gb, "after first_half_bitrate");
1823 get_bits(gb, 15); /* latter_half_bitrate */
1824 check_marker(s->avctx, gb, "after latter_half_bitrate");
1825 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1826 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1827 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1828 get_bits(gb, 11); /* first_half_vbv_occupancy */
1829 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1830 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1831 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1834 /* is setting low delay flag only once the smartest thing to do?
1835 * low delay detection will not be overridden. */
1836 if (s->picture_number == 0) {
1837 switch(s->vo_type) {
1838 case SIMPLE_VO_TYPE:
1839 case ADV_SIMPLE_VO_TYPE:
1848 ctx->shape = get_bits(gb, 2); /* vol shape */
1849 if (ctx->shape != RECT_SHAPE)
1850 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1851 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1852 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1853 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1856 check_marker(s->avctx, gb, "before time_increment_resolution");
1858 s->avctx->framerate.num = get_bits(gb, 16);
1859 if (!s->avctx->framerate.num) {
1860 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1861 return AVERROR_INVALIDDATA;
1864 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1865 if (ctx->time_increment_bits < 1)
1866 ctx->time_increment_bits = 1;
1868 check_marker(s->avctx, gb, "before fixed_vop_rate");
1870 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1871 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1873 s->avctx->framerate.den = 1;
1875 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1879 if (ctx->shape != BIN_ONLY_SHAPE) {
1880 if (ctx->shape == RECT_SHAPE) {
1881 check_marker(s->avctx, gb, "before width");
1882 width = get_bits(gb, 13);
1883 check_marker(s->avctx, gb, "before height");
1884 height = get_bits(gb, 13);
1885 check_marker(s->avctx, gb, "after height");
1886 if (width && height && /* they should be non zero but who knows */
1887 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1888 if (s->width && s->height &&
1889 (s->width != width || s->height != height))
1890 s->context_reinit = 1;
1896 s->progressive_sequence =
1897 s->progressive_frame = get_bits1(gb) ^ 1;
1898 s->interlaced_dct = 0;
1899 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1900 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1901 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1903 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1905 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1907 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1908 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1909 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1910 ctx->vol_sprite_usage == GMC_SPRITE) {
1911 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1912 skip_bits(gb, 13); // sprite_width
1913 check_marker(s->avctx, gb, "after sprite_width");
1914 skip_bits(gb, 13); // sprite_height
1915 check_marker(s->avctx, gb, "after sprite_height");
1916 skip_bits(gb, 13); // sprite_left
1917 check_marker(s->avctx, gb, "after sprite_left");
1918 skip_bits(gb, 13); // sprite_top
1919 check_marker(s->avctx, gb, "after sprite_top");
1921 ctx->num_sprite_warping_points = get_bits(gb, 6);
1922 if (ctx->num_sprite_warping_points > 3) {
1923 av_log(s->avctx, AV_LOG_ERROR,
1924 "%d sprite_warping_points\n",
1925 ctx->num_sprite_warping_points);
1926 ctx->num_sprite_warping_points = 0;
1927 return AVERROR_INVALIDDATA;
1929 s->sprite_warping_accuracy = get_bits(gb, 2);
1930 ctx->sprite_brightness_change = get_bits1(gb);
1931 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1932 skip_bits1(gb); // low_latency_sprite
1934 // FIXME sadct disable bit if verid!=1 && shape not rect
1936 if (get_bits1(gb) == 1) { /* not_8_bit */
1937 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1938 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1939 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1940 if (s->quant_precision != 5)
1941 av_log(s->avctx, AV_LOG_ERROR,
1942 "quant precision %d\n", s->quant_precision);
1943 if (s->quant_precision<3 || s->quant_precision>9) {
1944 s->quant_precision = 5;
1947 s->quant_precision = 5;
1950 // FIXME a bunch of grayscale shape things
1952 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1955 /* load default matrixes */
1956 for (i = 0; i < 64; i++) {
1957 int j = s->idsp.idct_permutation[i];
1958 v = ff_mpeg4_default_intra_matrix[i];
1959 s->intra_matrix[j] = v;
1960 s->chroma_intra_matrix[j] = v;
1962 v = ff_mpeg4_default_non_intra_matrix[i];
1963 s->inter_matrix[j] = v;
1964 s->chroma_inter_matrix[j] = v;
1967 /* load custom intra matrix */
1968 if (get_bits1(gb)) {
1970 for (i = 0; i < 64; i++) {
1972 if (get_bits_left(gb) < 8) {
1973 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1974 return AVERROR_INVALIDDATA;
1976 v = get_bits(gb, 8);
1981 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1982 s->intra_matrix[j] = last;
1983 s->chroma_intra_matrix[j] = last;
1986 /* replicate last value */
1987 for (; i < 64; i++) {
1988 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1989 s->intra_matrix[j] = last;
1990 s->chroma_intra_matrix[j] = last;
1994 /* load custom non intra matrix */
1995 if (get_bits1(gb)) {
1997 for (i = 0; i < 64; i++) {
1999 if (get_bits_left(gb) < 8) {
2000 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
2001 return AVERROR_INVALIDDATA;
2003 v = get_bits(gb, 8);
2008 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2009 s->inter_matrix[j] = v;
2010 s->chroma_inter_matrix[j] = v;
2013 /* replicate last value */
2014 for (; i < 64; i++) {
2015 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
2016 s->inter_matrix[j] = last;
2017 s->chroma_inter_matrix[j] = last;
2021 // FIXME a bunch of grayscale shape things
2025 s->quarter_sample = get_bits1(gb);
2027 s->quarter_sample = 0;
2029 if (get_bits_left(gb) < 4) {
2030 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
2031 return AVERROR_INVALIDDATA;
2034 if (!get_bits1(gb)) {
2035 int pos = get_bits_count(gb);
2036 int estimation_method = get_bits(gb, 2);
2037 if (estimation_method < 2) {
2038 if (!get_bits1(gb)) {
2039 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2040 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2041 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2042 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2043 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2044 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2046 if (!get_bits1(gb)) {
2047 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2048 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2049 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2050 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2052 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2053 skip_bits_long(gb, pos - get_bits_count(gb));
2056 if (!get_bits1(gb)) {
2057 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2058 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2059 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2060 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2062 if (!get_bits1(gb)) {
2063 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2064 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2065 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2066 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2067 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2068 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2070 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2071 skip_bits_long(gb, pos - get_bits_count(gb));
2074 if (estimation_method == 1) {
2075 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2076 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2079 av_log(s->avctx, AV_LOG_ERROR,
2080 "Invalid Complexity estimation method %d\n",
2085 ctx->cplx_estimation_trash_i =
2086 ctx->cplx_estimation_trash_p =
2087 ctx->cplx_estimation_trash_b = 0;
2090 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2092 s->data_partitioning = get_bits1(gb);
2093 if (s->data_partitioning)
2094 ctx->rvlc = get_bits1(gb);
2096 if (vo_ver_id != 1) {
2097 ctx->new_pred = get_bits1(gb);
2098 if (ctx->new_pred) {
2099 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2100 skip_bits(gb, 2); /* requested upstream message type */
2101 skip_bits1(gb); /* newpred segment type */
2103 if (get_bits1(gb)) // reduced_res_vop
2104 av_log(s->avctx, AV_LOG_ERROR,
2105 "reduced resolution VOP not supported\n");
2110 ctx->scalability = get_bits1(gb);
2112 if (ctx->scalability) {
2113 GetBitContext bak = *gb;
2114 int h_sampling_factor_n;
2115 int h_sampling_factor_m;
2116 int v_sampling_factor_n;
2117 int v_sampling_factor_m;
2119 skip_bits1(gb); // hierarchy_type
2120 skip_bits(gb, 4); /* ref_layer_id */
2121 skip_bits1(gb); /* ref_layer_sampling_dir */
2122 h_sampling_factor_n = get_bits(gb, 5);
2123 h_sampling_factor_m = get_bits(gb, 5);
2124 v_sampling_factor_n = get_bits(gb, 5);
2125 v_sampling_factor_m = get_bits(gb, 5);
2126 ctx->enhancement_type = get_bits1(gb);
2128 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2129 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2130 /* illegal scalability header (VERY broken encoder),
2131 * trying to workaround */
2132 ctx->scalability = 0;
2135 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2137 // bin shape stuff FIXME
2141 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2142 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",
2143 s->avctx->framerate.den, s->avctx->framerate.num,
2144 ctx->time_increment_bits,
2146 s->progressive_sequence,
2148 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2149 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2157 * Decode the user data stuff in the header.
2158 * Also initializes divx/xvid/lavc_version/build.
2160 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2162 MpegEncContext *s = &ctx->m;
2166 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2169 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2170 if (show_bits(gb, 23) == 0)
2172 buf[i] = get_bits(gb, 8);
2176 /* divx detection */
2177 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2179 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2181 ctx->divx_version = ver;
2182 ctx->divx_build = build;
2183 s->divx_packed = e == 3 && last == 'p';
2186 /* libavcodec detection */
2187 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2189 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2191 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2193 if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
2194 av_log(s->avctx, AV_LOG_WARNING,
2195 "Unknown Lavc version string encountered, %d.%d.%d; "
2196 "clamping sub-version values to 8-bits.\n",
2199 build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
2203 if (strcmp(buf, "ffmpeg") == 0)
2204 ctx->lavc_build = 4600;
2207 ctx->lavc_build = build;
2209 /* Xvid detection */
2210 e = sscanf(buf, "XviD%d", &build);
2212 ctx->xvid_build = build;
2217 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2219 Mpeg4DecContext *ctx = avctx->priv_data;
2220 MpegEncContext *s = &ctx->m;
2222 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2223 if (s->codec_tag == AV_RL32("XVID") ||
2224 s->codec_tag == AV_RL32("XVIX") ||
2225 s->codec_tag == AV_RL32("RMP4") ||
2226 s->codec_tag == AV_RL32("ZMP4") ||
2227 s->codec_tag == AV_RL32("SIPP"))
2228 ctx->xvid_build = 0;
2231 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2232 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2233 ctx->vol_control_parameters == 0)
2234 ctx->divx_version = 400; // divx 4
2236 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2238 ctx->divx_build = -1;
2241 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2242 if (s->codec_tag == AV_RL32("XVIX"))
2243 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2245 if (s->codec_tag == AV_RL32("UMP4"))
2246 s->workaround_bugs |= FF_BUG_UMP4;
2248 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2249 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2251 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2252 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2254 if (ctx->xvid_build <= 3U)
2255 s->padding_bug_score = 256 * 256 * 256 * 64;
2257 if (ctx->xvid_build <= 1U)
2258 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2260 if (ctx->xvid_build <= 12U)
2261 s->workaround_bugs |= FF_BUG_EDGE;
2263 if (ctx->xvid_build <= 32U)
2264 s->workaround_bugs |= FF_BUG_DC_CLIP;
2266 #define SET_QPEL_FUNC(postfix1, postfix2) \
2267 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2268 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2269 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2271 if (ctx->lavc_build < 4653U)
2272 s->workaround_bugs |= FF_BUG_STD_QPEL;
2274 if (ctx->lavc_build < 4655U)
2275 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2277 if (ctx->lavc_build < 4670U)
2278 s->workaround_bugs |= FF_BUG_EDGE;
2280 if (ctx->lavc_build <= 4712U)
2281 s->workaround_bugs |= FF_BUG_DC_CLIP;
2283 if ((ctx->lavc_build&0xFF) >= 100) {
2284 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2285 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2287 s->workaround_bugs |= FF_BUG_IEDGE;
2290 if (ctx->divx_version >= 0)
2291 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2292 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2293 s->padding_bug_score = 256 * 256 * 256 * 64;
2295 if (ctx->divx_version < 500U)
2296 s->workaround_bugs |= FF_BUG_EDGE;
2298 if (ctx->divx_version >= 0)
2299 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2302 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2303 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2304 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2305 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2306 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2307 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2308 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2310 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2311 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2312 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2313 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2314 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2315 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2318 if (avctx->debug & FF_DEBUG_BUGS)
2319 av_log(s->avctx, AV_LOG_DEBUG,
2320 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2321 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2322 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2324 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2325 s->codec_id == AV_CODEC_ID_MPEG4 &&
2326 avctx->idct_algo == FF_IDCT_AUTO) {
2327 avctx->idct_algo = FF_IDCT_XVID;
2328 ff_mpv_idct_init(s);
2335 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2337 MpegEncContext *s = &ctx->m;
2338 int time_incr, time_increment;
2342 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2343 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2344 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2345 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2349 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2350 if (s->partitioned_frame)
2351 s->decode_mb = mpeg4_decode_partitioned_mb;
2353 s->decode_mb = mpeg4_decode_mb;
2356 while (get_bits1(gb) != 0)
2359 check_marker(s->avctx, gb, "before time_increment");
2361 if (ctx->time_increment_bits == 0 ||
2362 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2363 av_log(s->avctx, AV_LOG_WARNING,
2364 "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);
2366 for (ctx->time_increment_bits = 1;
2367 ctx->time_increment_bits < 16;
2368 ctx->time_increment_bits++) {
2369 if (s->pict_type == AV_PICTURE_TYPE_P ||
2370 (s->pict_type == AV_PICTURE_TYPE_S &&
2371 ctx->vol_sprite_usage == GMC_SPRITE)) {
2372 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2374 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2378 av_log(s->avctx, AV_LOG_WARNING,
2379 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2380 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2381 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2382 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2387 time_increment = get_bits1(gb); // FIXME investigate further
2389 time_increment = get_bits(gb, ctx->time_increment_bits);
2391 if (s->pict_type != AV_PICTURE_TYPE_B) {
2392 s->last_time_base = s->time_base;
2393 s->time_base += time_incr;
2394 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2395 if (s->workaround_bugs & FF_BUG_UMP4) {
2396 if (s->time < s->last_non_b_time) {
2397 /* header is not mpeg-4-compatible, broken encoder,
2398 * trying to workaround */
2400 s->time += s->avctx->framerate.num;
2403 s->pp_time = s->time - s->last_non_b_time;
2404 s->last_non_b_time = s->time;
2406 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2407 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2408 if (s->pp_time <= s->pb_time ||
2409 s->pp_time <= s->pp_time - s->pb_time ||
2411 /* messed up order, maybe after seeking? skipping current B-frame */
2412 return FRAME_SKIPPED;
2414 ff_mpeg4_init_direct_mv(s);
2416 if (ctx->t_frame == 0)
2417 ctx->t_frame = s->pb_time;
2418 if (ctx->t_frame == 0)
2419 ctx->t_frame = 1; // 1/0 protection
2420 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2421 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2422 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2423 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2424 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2425 s->pb_field_time = 2;
2426 s->pp_field_time = 4;
2427 if (!s->progressive_sequence)
2428 return FRAME_SKIPPED;
2432 if (s->avctx->framerate.den)
2433 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2435 pts = AV_NOPTS_VALUE;
2436 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2438 check_marker(s->avctx, gb, "before vop_coded");
2441 if (get_bits1(gb) != 1) {
2442 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2443 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2444 return FRAME_SKIPPED;
2447 decode_new_pred(ctx, gb);
2449 if (ctx->shape != BIN_ONLY_SHAPE &&
2450 (s->pict_type == AV_PICTURE_TYPE_P ||
2451 (s->pict_type == AV_PICTURE_TYPE_S &&
2452 ctx->vol_sprite_usage == GMC_SPRITE))) {
2453 /* rounding type for motion estimation */
2454 s->no_rounding = get_bits1(gb);
2458 // FIXME reduced res stuff
2460 if (ctx->shape != RECT_SHAPE) {
2461 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2462 skip_bits(gb, 13); /* width */
2463 check_marker(s->avctx, gb, "after width");
2464 skip_bits(gb, 13); /* height */
2465 check_marker(s->avctx, gb, "after height");
2466 skip_bits(gb, 13); /* hor_spat_ref */
2467 check_marker(s->avctx, gb, "after hor_spat_ref");
2468 skip_bits(gb, 13); /* ver_spat_ref */
2470 skip_bits1(gb); /* change_CR_disable */
2472 if (get_bits1(gb) != 0)
2473 skip_bits(gb, 8); /* constant_alpha_value */
2476 // FIXME complexity estimation stuff
2478 if (ctx->shape != BIN_ONLY_SHAPE) {
2479 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2480 if (s->pict_type != AV_PICTURE_TYPE_I)
2481 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2482 if (s->pict_type == AV_PICTURE_TYPE_B)
2483 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2485 if (get_bits_left(gb) < 3) {
2486 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2487 return AVERROR_INVALIDDATA;
2489 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2490 if (!s->progressive_sequence) {
2491 s->top_field_first = get_bits1(gb);
2492 s->alternate_scan = get_bits1(gb);
2494 s->alternate_scan = 0;
2497 if (s->alternate_scan) {
2498 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2499 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2500 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2501 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2503 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2504 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2505 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2506 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2509 if (s->pict_type == AV_PICTURE_TYPE_S) {
2510 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2511 ctx->vol_sprite_usage == GMC_SPRITE)) {
2512 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2513 return AVERROR_INVALIDDATA;
2514 if (ctx->sprite_brightness_change)
2515 av_log(s->avctx, AV_LOG_ERROR,
2516 "sprite_brightness_change not supported\n");
2517 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2518 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2520 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2521 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2525 if (ctx->shape != BIN_ONLY_SHAPE) {
2526 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2527 if (s->qscale == 0) {
2528 av_log(s->avctx, AV_LOG_ERROR,
2529 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2530 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2533 if (s->pict_type != AV_PICTURE_TYPE_I) {
2534 s->f_code = get_bits(gb, 3); /* fcode_for */
2535 if (s->f_code == 0) {
2536 av_log(s->avctx, AV_LOG_ERROR,
2537 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2539 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2544 if (s->pict_type == AV_PICTURE_TYPE_B) {
2545 s->b_code = get_bits(gb, 3);
2546 if (s->b_code == 0) {
2547 av_log(s->avctx, AV_LOG_ERROR,
2548 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2550 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2555 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2556 av_log(s->avctx, AV_LOG_DEBUG,
2557 "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",
2558 s->qscale, s->f_code, s->b_code,
2559 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")),
2560 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2561 s->top_field_first, s->quarter_sample ? "q" : "h",
2562 s->data_partitioning, ctx->resync_marker,
2563 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2564 1 - s->no_rounding, s->vo_type,
2565 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2566 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2567 ctx->cplx_estimation_trash_b,
2573 if (!ctx->scalability) {
2574 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2575 skip_bits1(gb); // vop shape coding type
2577 if (ctx->enhancement_type) {
2578 int load_backward_shape = get_bits1(gb);
2579 if (load_backward_shape)
2580 av_log(s->avctx, AV_LOG_ERROR,
2581 "load backward shape isn't supported\n");
2583 skip_bits(gb, 2); // ref_select_code
2586 /* detect buggy encoders which don't set the low_delay flag
2587 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2588 * easily (although it's buggy too) */
2589 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2590 ctx->divx_version == -1 && s->picture_number == 0) {
2591 av_log(s->avctx, AV_LOG_WARNING,
2592 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2596 s->picture_number++; // better than pic number==0 always ;)
2598 // FIXME add short header support
2599 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2600 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2602 if (s->workaround_bugs & FF_BUG_EDGE) {
2603 s->h_edge_pos = s->width;
2604 s->v_edge_pos = s->height;
2610 * Decode MPEG-4 headers.
2611 * @return <0 if no VOP found (or a damaged one)
2612 * FRAME_SKIPPED if a not coded VOP is found
2613 * 0 if a VOP is found
2615 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2617 MpegEncContext *s = &ctx->m;
2618 unsigned startcode, v;
2622 /* search next start code */
2625 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2627 if (get_bits(gb, 8) == 0xF0)
2633 if (get_bits_count(gb) >= gb->size_in_bits) {
2634 if (gb->size_in_bits == 8 &&
2635 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2636 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2637 return FRAME_SKIPPED; // divx bug
2639 return -1; // end of stream
2642 /* use the bits after the test */
2643 v = get_bits(gb, 8);
2644 startcode = ((startcode << 8) | v) & 0xffffffff;
2646 if ((startcode & 0xFFFFFF00) != 0x100)
2647 continue; // no startcode
2649 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2650 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2651 if (startcode <= 0x11F)
2652 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2653 else if (startcode <= 0x12F)
2654 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2655 else if (startcode <= 0x13F)
2656 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2657 else if (startcode <= 0x15F)
2658 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2659 else if (startcode <= 0x1AF)
2660 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2661 else if (startcode == 0x1B0)
2662 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2663 else if (startcode == 0x1B1)
2664 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2665 else if (startcode == 0x1B2)
2666 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2667 else if (startcode == 0x1B3)
2668 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2669 else if (startcode == 0x1B4)
2670 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2671 else if (startcode == 0x1B5)
2672 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2673 else if (startcode == 0x1B6)
2674 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2675 else if (startcode == 0x1B7)
2676 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2677 else if (startcode == 0x1B8)
2678 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2679 else if (startcode == 0x1B9)
2680 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2681 else if (startcode == 0x1BA)
2682 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2683 else if (startcode == 0x1BB)
2684 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2685 else if (startcode == 0x1BC)
2686 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2687 else if (startcode == 0x1BD)
2688 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2689 else if (startcode == 0x1BE)
2690 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2691 else if (startcode == 0x1BF)
2692 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2693 else if (startcode == 0x1C0)
2694 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2695 else if (startcode == 0x1C1)
2696 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2697 else if (startcode == 0x1C2)
2698 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2699 else if (startcode == 0x1C3)
2700 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2701 else if (startcode <= 0x1C5)
2702 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2703 else if (startcode <= 0x1FF)
2704 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2705 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2708 if (startcode >= 0x120 && startcode <= 0x12F) {
2710 av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
2714 if ((ret = decode_vol_header(ctx, gb)) < 0)
2716 } else if (startcode == USER_DATA_STARTCODE) {
2717 decode_user_data(ctx, gb);
2718 } else if (startcode == GOP_STARTCODE) {
2719 mpeg4_decode_gop_header(s, gb);
2720 } else if (startcode == VOS_STARTCODE) {
2721 mpeg4_decode_profile_level(s, gb);
2722 } else if (startcode == VISUAL_OBJ_STARTCODE) {
2723 mpeg4_decode_visual_object(s, gb);
2724 } else if (startcode == VOP_STARTCODE) {
2733 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2735 s->avctx->has_b_frames = !s->low_delay;
2737 return decode_vop_header(ctx, gb);
2740 av_cold void ff_mpeg4videodec_static_init(void) {
2741 static int done = 0;
2744 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2745 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2746 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2747 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2748 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2749 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2750 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2751 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2752 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2753 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2754 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2755 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2756 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2757 &ff_sprite_trajectory_tab[0][1], 4, 2,
2758 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2759 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2760 &ff_mb_type_b_tab[0][1], 2, 1,
2761 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2766 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2768 Mpeg4DecContext *ctx = avctx->priv_data;
2769 MpegEncContext *s = &ctx->m;
2771 /* divx 5.01+ bitstream reorder stuff */
2772 /* Since this clobbers the input buffer and hwaccel codecs still need the
2773 * data during hwaccel->end_frame we should not do this any earlier */
2774 if (s->divx_packed) {
2775 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2776 int startcode_found = 0;
2778 if (buf_size - current_pos > 7) {
2781 for (i = current_pos; i < buf_size - 4; i++)
2786 buf[i + 3] == 0xB6) {
2787 startcode_found = !(buf[i + 4] & 0x40);
2792 if (startcode_found) {
2793 if (!ctx->showed_packed_warning) {
2794 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2795 "wasteful way to store B-frames ('packed B-frames'). "
2796 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2797 ctx->showed_packed_warning = 1;
2799 av_fast_padded_malloc(&s->bitstream_buffer,
2800 &s->allocated_bitstream_buffer_size,
2801 buf_size - current_pos);
2802 if (!s->bitstream_buffer) {
2803 s->bitstream_buffer_size = 0;
2804 return AVERROR(ENOMEM);
2806 memcpy(s->bitstream_buffer, buf + current_pos,
2807 buf_size - current_pos);
2808 s->bitstream_buffer_size = buf_size - current_pos;
2816 static int mpeg4_update_thread_context(AVCodecContext *dst,
2817 const AVCodecContext *src)
2819 Mpeg4DecContext *s = dst->priv_data;
2820 const Mpeg4DecContext *s1 = src->priv_data;
2821 int init = s->m.context_initialized;
2823 int ret = ff_mpeg_update_thread_context(dst, src);
2828 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2830 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2831 ff_xvid_idct_init(&s->m.idsp, dst);
2837 static av_cold int decode_init(AVCodecContext *avctx)
2839 Mpeg4DecContext *ctx = avctx->priv_data;
2840 MpegEncContext *s = &ctx->m;
2846 ctx->lavc_build = -1;
2848 if ((ret = ff_h263_decode_init(avctx)) < 0)
2851 ff_mpeg4videodec_static_init();
2854 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2855 s->decode_mb = mpeg4_decode_mb;
2856 ctx->time_increment_bits = 4; /* default value for broken headers */
2858 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2859 avctx->internal->allocate_progress = 1;
2864 static const AVOption mpeg4_options[] = {
2865 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2866 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2870 static const AVClass mpeg4_class = {
2871 .class_name = "MPEG4 Video Decoder",
2872 .item_name = av_default_item_name,
2873 .option = mpeg4_options,
2874 .version = LIBAVUTIL_VERSION_INT,
2877 AVCodec ff_mpeg4_decoder = {
2879 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2880 .type = AVMEDIA_TYPE_VIDEO,
2881 .id = AV_CODEC_ID_MPEG4,
2882 .priv_data_size = sizeof(Mpeg4DecContext),
2883 .init = decode_init,
2884 .close = ff_h263_decode_end,
2885 .decode = ff_h263_decode_frame,
2886 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2887 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2888 AV_CODEC_CAP_FRAME_THREADS,
2889 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2890 .flush = ff_mpeg_flush,
2892 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2893 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2894 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2895 .priv_class = &mpeg4_class,
2896 .hw_configs = (const AVCodecHWConfigInternal*[]) {
2897 #if CONFIG_MPEG4_NVDEC_HWACCEL
2898 HWACCEL_NVDEC(mpeg4),
2900 #if CONFIG_MPEG4_VAAPI_HWACCEL
2901 HWACCEL_VAAPI(mpeg4),
2903 #if CONFIG_MPEG4_VDPAU_HWACCEL
2904 HWACCEL_VDPAU(mpeg4),
2906 #if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
2907 HWACCEL_VIDEOTOOLBOX(mpeg4),