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"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
39 /* The defines below define the number of bits that are read at once for
40 * reading vlc values. Changing these may improve speed and data cache needs
41 * be aware though that decreasing them may need the number of stages that is
42 * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
45 #define MB_TYPE_B_VLC_BITS 4
47 static VLC dc_lum, dc_chrom;
48 static VLC sprite_trajectory;
49 static VLC mb_type_b_vlc;
51 static const int mb_type_b_map[4] = {
52 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
53 MB_TYPE_L0L1 | MB_TYPE_16x16,
54 MB_TYPE_L1 | MB_TYPE_16x16,
55 MB_TYPE_L0 | MB_TYPE_16x16,
60 * @param n block index (0-3 are luma, 4-5 are chroma)
61 * @param dir the ac prediction direction
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
66 int16_t *ac_val, *ac_val1;
67 int8_t *const qscale_table = s->current_picture.qscale_table;
70 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
74 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
78 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
81 for (i = 1; i < 8; i++)
82 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
84 /* different qscale, we must rescale */
85 for (i = 1; i < 8; i++)
86 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
89 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
91 ac_val -= 16 * s->block_wrap[n];
93 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
96 for (i = 1; i < 8; i++)
97 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
99 /* different qscale, we must rescale */
100 for (i = 1; i < 8; i++)
101 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
106 for (i = 1; i < 8; i++)
107 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
110 for (i = 1; i < 8; i++)
111 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
115 * check if the next stuff is a resync marker or the end.
118 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
120 MpegEncContext *s = &ctx->m;
121 int bits_count = get_bits_count(&s->gb);
122 int v = show_bits(&s->gb, 16);
124 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
128 if (s->pict_type == AV_PICTURE_TYPE_B ||
129 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
131 skip_bits(&s->gb, 8 + s->pict_type);
132 bits_count += 8 + s->pict_type;
133 v = show_bits(&s->gb, 16);
136 if (bits_count + 8 >= s->gb.size_in_bits) {
138 v |= 0x7F >> (7 - (bits_count & 7));
143 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
145 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146 GetBitContext gb = s->gb;
148 skip_bits(&s->gb, 1);
149 align_get_bits(&s->gb);
151 for (len = 0; len < 32; len++)
152 if (get_bits1(&s->gb))
155 mb_num = get_bits(&s->gb, mb_num_bits);
156 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
161 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
170 MpegEncContext *s = &ctx->m;
171 int a = 2 << s->sprite_warping_accuracy;
172 int rho = 3 - s->sprite_warping_accuracy;
178 int min_ab, i, w2, h2, w3, h3;
179 int sprite_ref[4][2];
180 int virtual_ref[2][2];
181 int64_t sprite_offset[2][2];
182 int64_t sprite_delta[2][2];
184 // only true for rectangle shapes
185 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
186 { 0, s->height }, { s->width, s->height } };
187 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
189 if (w <= 0 || h <= 0)
190 return AVERROR_INVALIDDATA;
192 /* the decoder was not properly initialized and we cannot continue */
193 if (sprite_trajectory.table == NULL)
194 return AVERROR_INVALIDDATA;
196 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
200 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
202 x = get_xbits(gb, length);
204 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
205 check_marker(s->avctx, gb, "before sprite_trajectory");
207 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
209 y = get_xbits(gb, length);
211 check_marker(s->avctx, gb, "after sprite_trajectory");
212 ctx->sprite_traj[i][0] = d[i][0] = x;
213 ctx->sprite_traj[i][1] = d[i][1] = y;
216 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
218 while ((1 << alpha) < w)
220 while ((1 << beta) < h)
221 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
225 // Note, the 4th point isn't used for GMC
226 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
227 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
228 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
229 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
230 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
231 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
232 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
234 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
235 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
236 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
237 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
238 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
239 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
241 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
242 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
244 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
245 * because of that...). Perhaps it should be reordered to be more readable.
246 * The idea behind this virtual_ref mess is to be able to use shifts later
247 * per pixel instead of divides so the distance between points is converted
248 * from w&h based to w2&h2 based which are of the 2^x form. */
249 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
250 ROUNDED_DIV(((w - w2) *
251 (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
252 w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
253 virtual_ref[0][1] = 16 * vop_ref[0][1] +
254 ROUNDED_DIV(((w - w2) *
255 (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
256 w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
257 virtual_ref[1][0] = 16 * vop_ref[0][0] +
258 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
259 h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
260 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
261 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
262 h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
264 switch (ctx->num_sprite_warping_points) {
266 sprite_offset[0][0] =
267 sprite_offset[0][1] =
268 sprite_offset[1][0] =
269 sprite_offset[1][1] = 0;
270 sprite_delta[0][0] = a;
272 sprite_delta[1][0] = 0;
273 sprite_delta[1][1] = a;
274 ctx->sprite_shift[0] =
275 ctx->sprite_shift[1] = 0;
278 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
279 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
280 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
281 a * (vop_ref[0][0] / 2);
282 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
283 a * (vop_ref[0][1] / 2);
284 sprite_delta[0][0] = a;
286 sprite_delta[1][0] = 0;
287 sprite_delta[1][1] = a;
288 ctx->sprite_shift[0] =
289 ctx->sprite_shift[1] = 0;
292 sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
293 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
294 ((int64_t) -vop_ref[0][0]) +
295 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
296 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
297 sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
298 ((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
299 ((int64_t) -vop_ref[0][0]) +
300 ((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
301 ((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
302 sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
303 ((int64_t)-2 * vop_ref[0][0] + 1) +
304 ((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
305 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
306 (int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
307 sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
308 ((int64_t)-2 * vop_ref[0][0] + 1) +
309 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
310 ((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
311 (int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
312 sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
313 sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
314 sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
315 sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
317 ctx->sprite_shift[0] = alpha + rho;
318 ctx->sprite_shift[1] = alpha + rho + 2;
321 min_ab = FFMIN(alpha, beta);
324 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
325 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
326 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
327 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
328 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
329 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
330 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
331 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
332 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
333 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
334 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
335 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
336 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
337 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
338 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
339 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
340 sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
341 sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
342 sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
343 sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
345 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
346 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
349 /* try to simplify the situation */
350 if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
351 sprite_delta[0][1] == 0 &&
352 sprite_delta[1][0] == 0 &&
353 sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
354 sprite_offset[0][0] >>= ctx->sprite_shift[0];
355 sprite_offset[0][1] >>= ctx->sprite_shift[0];
356 sprite_offset[1][0] >>= ctx->sprite_shift[1];
357 sprite_offset[1][1] >>= ctx->sprite_shift[1];
358 sprite_delta[0][0] = a;
359 sprite_delta[0][1] = 0;
360 sprite_delta[1][0] = 0;
361 sprite_delta[1][1] = a;
362 ctx->sprite_shift[0] = 0;
363 ctx->sprite_shift[1] = 0;
364 s->real_sprite_warping_points = 1;
366 int shift_y = 16 - ctx->sprite_shift[0];
367 int shift_c = 16 - ctx->sprite_shift[1];
369 for (i = 0; i < 2; i++) {
370 if (shift_c < 0 || shift_y < 0 ||
371 FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
372 FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
373 FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
374 FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
376 avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
381 for (i = 0; i < 2; i++) {
382 sprite_offset[0][i] *= 1 << shift_y;
383 sprite_offset[1][i] *= 1 << shift_c;
384 sprite_delta[0][i] *= 1 << shift_y;
385 sprite_delta[1][i] *= 1 << shift_y;
386 ctx->sprite_shift[i] = 16;
389 for (i = 0; i < 2; i++) {
391 sprite_delta[i][0] - a * (1LL<<16),
392 sprite_delta[i][1] - a * (1LL<<16)
395 if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
396 llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
397 llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
398 llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
399 llabs(sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
400 llabs(sd[0]) >= INT_MAX ||
401 llabs(sd[1]) >= INT_MAX ||
402 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
403 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
404 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
406 avpriv_request_sample(s->avctx, "Overflow on sprite points");
410 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
413 for (i = 0; i < 4; i++) {
414 s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
415 s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
420 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
421 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
422 return AVERROR_PATCHWELCOME;
425 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
426 MpegEncContext *s = &ctx->m;
427 int len = FFMIN(ctx->time_increment_bits + 3, 15);
432 check_marker(s->avctx, gb, "after new_pred");
438 * Decode the next video packet.
439 * @return <0 if something went wrong
441 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
443 MpegEncContext *s = &ctx->m;
445 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
446 int header_extension = 0, mb_num, len;
448 /* is there enough space left for a video packet + header */
449 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
452 for (len = 0; len < 32; len++)
453 if (get_bits1(&s->gb))
456 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
457 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
461 if (ctx->shape != RECT_SHAPE) {
462 header_extension = get_bits1(&s->gb);
463 // FIXME more stuff here
466 mb_num = get_bits(&s->gb, mb_num_bits);
467 if (mb_num >= s->mb_num) {
468 av_log(s->avctx, AV_LOG_ERROR,
469 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
473 s->mb_x = mb_num % s->mb_width;
474 s->mb_y = mb_num / s->mb_width;
476 if (ctx->shape != BIN_ONLY_SHAPE) {
477 int qscale = get_bits(&s->gb, s->quant_precision);
479 s->chroma_qscale = s->qscale = qscale;
482 if (ctx->shape == RECT_SHAPE)
483 header_extension = get_bits1(&s->gb);
485 if (header_extension) {
488 while (get_bits1(&s->gb) != 0)
491 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
492 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
493 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
495 skip_bits(&s->gb, 2); /* vop coding type */
496 // FIXME not rect stuff here
498 if (ctx->shape != BIN_ONLY_SHAPE) {
499 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
500 // FIXME don't just ignore everything
501 if (s->pict_type == AV_PICTURE_TYPE_S &&
502 ctx->vol_sprite_usage == GMC_SPRITE) {
503 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
504 return AVERROR_INVALIDDATA;
505 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
508 // FIXME reduced res stuff here
510 if (s->pict_type != AV_PICTURE_TYPE_I) {
511 int f_code = get_bits(&s->gb, 3); /* fcode_for */
513 av_log(s->avctx, AV_LOG_ERROR,
514 "Error, video packet header damaged (f_code=0)\n");
516 if (s->pict_type == AV_PICTURE_TYPE_B) {
517 int b_code = get_bits(&s->gb, 3);
519 av_log(s->avctx, AV_LOG_ERROR,
520 "Error, video packet header damaged (b_code=0)\n");
525 decode_new_pred(ctx, &s->gb);
531 * Get the average motion vector for a GMC MB.
532 * @param n either 0 for the x component or 1 for y
533 * @return the average MV for a GMC MB
535 static inline int get_amv(Mpeg4DecContext *ctx, int n)
537 MpegEncContext *s = &ctx->m;
538 int x, y, mb_v, sum, dx, dy, shift;
539 int len = 1 << (s->f_code + 4);
540 const int a = s->sprite_warping_accuracy;
542 if (s->workaround_bugs & FF_BUG_AMV)
543 len >>= s->quarter_sample;
545 if (s->real_sprite_warping_points == 1) {
546 if (ctx->divx_version == 500 && ctx->divx_build == 413)
547 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
549 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
551 dx = s->sprite_delta[n][0];
552 dy = s->sprite_delta[n][1];
553 shift = ctx->sprite_shift[0];
555 dy -= 1 << (shift + a + 1);
557 dx -= 1 << (shift + a + 1);
558 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
561 for (y = 0; y < 16; y++) {
566 for (x = 0; x < 16; x++) {
571 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
583 * Decode the dc value.
584 * @param n block index (0-3 are luma, 4-5 are chroma)
585 * @param dir_ptr the prediction direction will be stored here
586 * @return the quantized dc
588 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
593 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
595 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
597 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
598 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
607 level = 2 * get_bits1(&s->gb) - 1;
609 if (get_bits1(&s->gb))
610 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
612 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
615 level = get_xbits(&s->gb, code);
619 if (get_bits1(&s->gb) == 0) { /* marker */
620 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
621 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
628 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
632 * Decode first partition.
633 * @return number of MBs decoded or <0 if an error occurred
635 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
637 MpegEncContext *s = &ctx->m;
639 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
641 /* decode first partition */
642 s->first_slice_line = 1;
643 for (; s->mb_y < s->mb_height; s->mb_y++) {
644 ff_init_block_index(s);
645 for (; s->mb_x < s->mb_width; s->mb_x++) {
646 const int xy = s->mb_x + s->mb_y * s->mb_stride;
651 ff_update_block_index(s);
652 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
653 s->first_slice_line = 0;
655 if (s->pict_type == AV_PICTURE_TYPE_I) {
659 if (show_bits_long(&s->gb, 19) == DC_MARKER)
662 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
664 av_log(s->avctx, AV_LOG_ERROR,
665 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
670 s->cbp_table[xy] = cbpc & 3;
671 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
675 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
677 s->current_picture.qscale_table[xy] = s->qscale;
679 s->mbintra_table[xy] = 1;
680 for (i = 0; i < 6; i++) {
682 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
684 av_log(s->avctx, AV_LOG_ERROR,
685 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
692 s->pred_dir_table[xy] = dir;
693 } else { /* P/S_TYPE */
694 int mx, my, pred_x, pred_y, bits;
695 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
696 const int stride = s->b8_stride * 2;
699 bits = show_bits(&s->gb, 17);
700 if (bits == MOTION_MARKER)
704 if (bits & 0x10000) {
706 if (s->pict_type == AV_PICTURE_TYPE_S &&
707 ctx->vol_sprite_usage == GMC_SPRITE) {
708 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
712 mx = get_amv(ctx, 0);
713 my = get_amv(ctx, 1);
715 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
722 mot_val[0 + stride] =
723 mot_val[2 + stride] = mx;
726 mot_val[1 + stride] =
727 mot_val[3 + stride] = my;
729 if (s->mbintra_table[xy])
730 ff_clean_intra_table_entries(s);
734 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
736 av_log(s->avctx, AV_LOG_ERROR,
737 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
743 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
745 s->mb_intra = ((cbpc & 4) != 0);
748 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
749 s->mbintra_table[xy] = 1;
752 mot_val[0 + stride] =
753 mot_val[2 + stride] = 0;
756 mot_val[1 + stride] =
757 mot_val[3 + stride] = 0;
759 if (s->mbintra_table[xy])
760 ff_clean_intra_table_entries(s);
762 if (s->pict_type == AV_PICTURE_TYPE_S &&
763 ctx->vol_sprite_usage == GMC_SPRITE &&
765 s->mcsel = get_bits1(&s->gb);
769 if ((cbpc & 16) == 0) {
770 /* 16x16 motion prediction */
772 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
774 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
778 my = ff_h263_decode_motion(s, pred_y, s->f_code);
781 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
784 mx = get_amv(ctx, 0);
785 my = get_amv(ctx, 1);
786 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
793 mot_val[0 + stride] =
794 mot_val[2 + stride] = mx;
797 mot_val[1 + stride] =
798 mot_val[3 + stride] = my;
801 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
803 for (i = 0; i < 4; i++) {
804 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
805 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
809 my = ff_h263_decode_motion(s, pred_y, s->f_code);
826 * decode second partition.
827 * @return <0 if an error occurred
829 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
832 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
834 s->mb_x = s->resync_mb_x;
835 s->first_slice_line = 1;
836 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
837 ff_init_block_index(s);
838 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
839 const int xy = s->mb_x + s->mb_y * s->mb_stride;
842 ff_update_block_index(s);
843 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
844 s->first_slice_line = 0;
846 if (s->pict_type == AV_PICTURE_TYPE_I) {
847 int ac_pred = get_bits1(&s->gb);
848 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
850 av_log(s->avctx, AV_LOG_ERROR,
851 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
855 s->cbp_table[xy] |= cbpy << 2;
856 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
857 } else { /* P || S_TYPE */
858 if (IS_INTRA(s->current_picture.mb_type[xy])) {
861 int ac_pred = get_bits1(&s->gb);
862 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
865 av_log(s->avctx, AV_LOG_ERROR,
866 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
870 if (s->cbp_table[xy] & 8)
871 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
872 s->current_picture.qscale_table[xy] = s->qscale;
874 for (i = 0; i < 6; i++) {
876 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
878 av_log(s->avctx, AV_LOG_ERROR,
879 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
886 s->cbp_table[xy] &= 3; // remove dquant
887 s->cbp_table[xy] |= cbpy << 2;
888 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
889 s->pred_dir_table[xy] = dir;
890 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
891 s->current_picture.qscale_table[xy] = s->qscale;
892 s->cbp_table[xy] = 0;
894 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
897 av_log(s->avctx, AV_LOG_ERROR,
898 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
902 if (s->cbp_table[xy] & 8)
903 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
904 s->current_picture.qscale_table[xy] = s->qscale;
906 s->cbp_table[xy] &= 3; // remove dquant
907 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
911 if (mb_num >= mb_count)
919 * Decode the first and second partition.
920 * @return <0 if error (and sets error type in the error_status_table)
922 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
924 MpegEncContext *s = &ctx->m;
926 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
927 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
929 mb_num = mpeg4_decode_partition_a(ctx);
931 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
932 s->mb_x, s->mb_y, part_a_error);
936 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
937 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
938 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
939 s->mb_x, s->mb_y, part_a_error);
943 s->mb_num_left = mb_num;
945 if (s->pict_type == AV_PICTURE_TYPE_I) {
946 while (show_bits(&s->gb, 9) == 1)
947 skip_bits(&s->gb, 9);
948 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
949 av_log(s->avctx, AV_LOG_ERROR,
950 "marker missing after first I partition at %d %d\n",
955 while (show_bits(&s->gb, 10) == 1)
956 skip_bits(&s->gb, 10);
957 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
958 av_log(s->avctx, AV_LOG_ERROR,
959 "marker missing after first P partition at %d %d\n",
964 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
965 s->mb_x - 1, s->mb_y, part_a_end);
967 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
968 if (s->pict_type == AV_PICTURE_TYPE_P)
969 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
970 s->mb_x, s->mb_y, ER_DC_ERROR);
973 if (s->pict_type == AV_PICTURE_TYPE_P)
974 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
975 s->mb_x - 1, s->mb_y, ER_DC_END);
983 * @return <0 if an error occurred
985 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
986 int n, int coded, int intra, int rvlc)
988 MpegEncContext *s = &ctx->m;
989 int level, i, last, run, qmul, qadd;
990 int av_uninit(dc_pred_dir);
993 const uint8_t *scan_table;
995 // Note intra & rvlc should be optimized away if this is inlined
998 if (ctx->use_intra_dc_vlc) {
1000 if (s->partitioned_frame) {
1001 level = s->dc_val[0][s->block_index[n]];
1003 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
1005 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
1006 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1008 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1016 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1022 rl = &ff_rvlc_rl_intra;
1023 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1025 rl = &ff_mpeg4_rl_intra;
1026 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1029 if (dc_pred_dir == 0)
1030 scan_table = s->intra_v_scantable.permutated; /* left */
1032 scan_table = s->intra_h_scantable.permutated; /* top */
1034 scan_table = s->intra_scantable.permutated;
1041 s->block_last_index[n] = i;
1045 rl = &ff_rvlc_rl_inter;
1047 rl = &ff_h263_rl_inter;
1049 scan_table = s->intra_scantable.permutated;
1051 if (s->mpeg_quant) {
1055 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1057 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1059 qmul = s->qscale << 1;
1060 qadd = (s->qscale - 1) | 1;
1062 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1064 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1068 OPEN_READER(re, &s->gb);
1070 UPDATE_CACHE(re, &s->gb);
1071 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1075 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1076 av_log(s->avctx, AV_LOG_ERROR,
1077 "1. marker bit missing in rvlc esc\n");
1080 SKIP_CACHE(re, &s->gb, 1);
1082 last = SHOW_UBITS(re, &s->gb, 1);
1083 SKIP_CACHE(re, &s->gb, 1);
1084 run = SHOW_UBITS(re, &s->gb, 6);
1085 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1086 UPDATE_CACHE(re, &s->gb);
1088 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1089 av_log(s->avctx, AV_LOG_ERROR,
1090 "2. marker bit missing in rvlc esc\n");
1093 SKIP_CACHE(re, &s->gb, 1);
1095 level = SHOW_UBITS(re, &s->gb, 11);
1096 SKIP_CACHE(re, &s->gb, 11);
1098 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1099 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1102 SKIP_CACHE(re, &s->gb, 5);
1104 level = level * qmul + qadd;
1105 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1106 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1113 cache = GET_CACHE(re, &s->gb);
1116 cache ^= 0xC0000000;
1118 if (cache & 0x80000000) {
1119 if (cache & 0x40000000) {
1121 SKIP_CACHE(re, &s->gb, 2);
1122 last = SHOW_UBITS(re, &s->gb, 1);
1123 SKIP_CACHE(re, &s->gb, 1);
1124 run = SHOW_UBITS(re, &s->gb, 6);
1125 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1126 UPDATE_CACHE(re, &s->gb);
1129 level = SHOW_SBITS(re, &s->gb, 12);
1130 LAST_SKIP_BITS(re, &s->gb, 12);
1132 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1133 av_log(s->avctx, AV_LOG_ERROR,
1134 "1. marker bit missing in 3. esc\n");
1135 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1138 SKIP_CACHE(re, &s->gb, 1);
1140 level = SHOW_SBITS(re, &s->gb, 12);
1141 SKIP_CACHE(re, &s->gb, 12);
1143 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1144 av_log(s->avctx, AV_LOG_ERROR,
1145 "2. marker bit missing in 3. esc\n");
1146 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1150 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1154 if (s->error_recognition >= FF_ER_COMPLIANT) {
1155 const int abs_level= FFABS(level);
1156 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1157 const int run1= run - rl->max_run[last][abs_level] - 1;
1158 if (abs_level <= rl->max_level[last][run]) {
1159 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1162 if (s->error_recognition > FF_ER_COMPLIANT) {
1163 if (abs_level <= rl->max_level[last][run]*2) {
1164 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1167 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1168 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1176 level = level * qmul + qadd;
1178 level = level * qmul - qadd;
1180 if ((unsigned)(level + 2048) > 4095) {
1181 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1182 if (level > 2560 || level < -2560) {
1183 av_log(s->avctx, AV_LOG_ERROR,
1184 "|level| overflow in 3. esc, qp=%d\n",
1189 level = level < 0 ? -2048 : 2047;
1197 SKIP_BITS(re, &s->gb, 2);
1198 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1199 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1200 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1201 LAST_SKIP_BITS(re, &s->gb, 1);
1205 SKIP_BITS(re, &s->gb, 1);
1206 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1208 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1209 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1210 LAST_SKIP_BITS(re, &s->gb, 1);
1215 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1216 LAST_SKIP_BITS(re, &s->gb, 1);
1218 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1222 av_log(s->avctx, AV_LOG_ERROR,
1223 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1227 block[scan_table[i]] = level;
1231 block[scan_table[i]] = level;
1233 CLOSE_READER(re, &s->gb);
1238 if (!ctx->use_intra_dc_vlc) {
1239 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1241 i -= i >> 31; // if (i == -1) i = 0;
1244 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1246 i = 63; // FIXME not optimal
1248 s->block_last_index[n] = i;
1253 * decode partition C of one MB.
1254 * @return <0 if an error occurred
1256 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1258 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1260 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1262 mb_type = s->current_picture.mb_type[xy];
1263 cbp = s->cbp_table[xy];
1265 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1267 if (s->current_picture.qscale_table[xy] != s->qscale)
1268 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1270 if (s->pict_type == AV_PICTURE_TYPE_P ||
1271 s->pict_type == AV_PICTURE_TYPE_S) {
1273 for (i = 0; i < 4; i++) {
1274 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1275 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1277 s->mb_intra = IS_INTRA(mb_type);
1279 if (IS_SKIP(mb_type)) {
1281 for (i = 0; i < 6; i++)
1282 s->block_last_index[i] = -1;
1283 s->mv_dir = MV_DIR_FORWARD;
1284 s->mv_type = MV_TYPE_16X16;
1285 if (s->pict_type == AV_PICTURE_TYPE_S
1286 && ctx->vol_sprite_usage == GMC_SPRITE) {
1293 } else if (s->mb_intra) {
1294 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1295 } else if (!s->mb_intra) {
1296 // s->mcsel = 0; // FIXME do we need to init that?
1298 s->mv_dir = MV_DIR_FORWARD;
1299 if (IS_8X8(mb_type)) {
1300 s->mv_type = MV_TYPE_8X8;
1302 s->mv_type = MV_TYPE_16X16;
1305 } else { /* I-Frame */
1307 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1310 if (!IS_SKIP(mb_type)) {
1312 s->bdsp.clear_blocks(s->block[0]);
1313 /* decode each block */
1314 for (i = 0; i < 6; i++) {
1315 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1316 av_log(s->avctx, AV_LOG_ERROR,
1317 "texture corrupted at %d %d %d\n",
1318 s->mb_x, s->mb_y, s->mb_intra);
1325 /* per-MB end of slice check */
1326 if (--s->mb_num_left <= 0) {
1327 if (mpeg4_is_resync(ctx))
1332 if (mpeg4_is_resync(ctx)) {
1333 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1334 if (s->cbp_table[xy + delta])
1341 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1343 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1344 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1346 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1347 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1349 av_assert2(s->h263_pred);
1351 if (s->pict_type == AV_PICTURE_TYPE_P ||
1352 s->pict_type == AV_PICTURE_TYPE_S) {
1354 if (get_bits1(&s->gb)) {
1357 for (i = 0; i < 6; i++)
1358 s->block_last_index[i] = -1;
1359 s->mv_dir = MV_DIR_FORWARD;
1360 s->mv_type = MV_TYPE_16X16;
1361 if (s->pict_type == AV_PICTURE_TYPE_S &&
1362 ctx->vol_sprite_usage == GMC_SPRITE) {
1363 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1368 s->mv[0][0][0] = get_amv(ctx, 0);
1369 s->mv[0][0][1] = get_amv(ctx, 1);
1372 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1382 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1384 av_log(s->avctx, AV_LOG_ERROR,
1385 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1388 } while (cbpc == 20);
1390 s->bdsp.clear_blocks(s->block[0]);
1392 s->mb_intra = ((cbpc & 4) != 0);
1396 if (s->pict_type == AV_PICTURE_TYPE_S &&
1397 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1398 s->mcsel = get_bits1(&s->gb);
1401 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1403 av_log(s->avctx, AV_LOG_ERROR,
1404 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1405 return AVERROR_INVALIDDATA;
1408 cbp = (cbpc & 3) | (cbpy << 2);
1410 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1411 if ((!s->progressive_sequence) &&
1412 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1413 s->interlaced_dct = get_bits1(&s->gb);
1415 s->mv_dir = MV_DIR_FORWARD;
1416 if ((cbpc & 16) == 0) {
1418 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1421 /* 16x16 global motion prediction */
1422 s->mv_type = MV_TYPE_16X16;
1423 mx = get_amv(ctx, 0);
1424 my = get_amv(ctx, 1);
1425 s->mv[0][0][0] = mx;
1426 s->mv[0][0][1] = my;
1427 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1428 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1431 /* 16x8 field motion prediction */
1432 s->mv_type = MV_TYPE_FIELD;
1434 s->field_select[0][0] = get_bits1(&s->gb);
1435 s->field_select[0][1] = get_bits1(&s->gb);
1437 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1439 for (i = 0; i < 2; i++) {
1440 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1444 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1448 s->mv[0][i][0] = mx;
1449 s->mv[0][i][1] = my;
1452 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1453 /* 16x16 motion prediction */
1454 s->mv_type = MV_TYPE_16X16;
1455 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1456 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1461 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1465 s->mv[0][0][0] = mx;
1466 s->mv[0][0][1] = my;
1469 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1470 s->mv_type = MV_TYPE_8X8;
1471 for (i = 0; i < 4; i++) {
1472 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1473 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1477 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1480 s->mv[0][i][0] = mx;
1481 s->mv[0][i][1] = my;
1486 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1487 int modb1; // first bit of modb
1488 int modb2; // second bit of modb
1491 s->mb_intra = 0; // B-frames never contain intra blocks
1492 s->mcsel = 0; // ... true gmc blocks
1495 for (i = 0; i < 2; i++) {
1496 s->last_mv[i][0][0] =
1497 s->last_mv[i][0][1] =
1498 s->last_mv[i][1][0] =
1499 s->last_mv[i][1][1] = 0;
1502 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1505 /* if we skipped it in the future P-frame than skip it now too */
1506 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1508 if (s->mb_skipped) {
1510 for (i = 0; i < 6; i++)
1511 s->block_last_index[i] = -1;
1513 s->mv_dir = MV_DIR_FORWARD;
1514 s->mv_type = MV_TYPE_16X16;
1519 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1525 modb1 = get_bits1(&s->gb);
1527 // like MB_TYPE_B_DIRECT but no vectors coded
1528 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1531 modb2 = get_bits1(&s->gb);
1532 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1534 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1537 mb_type = mb_type_b_map[mb_type];
1541 s->bdsp.clear_blocks(s->block[0]);
1542 cbp = get_bits(&s->gb, 6);
1545 if ((!IS_DIRECT(mb_type)) && cbp) {
1546 if (get_bits1(&s->gb))
1547 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1550 if (!s->progressive_sequence) {
1552 s->interlaced_dct = get_bits1(&s->gb);
1554 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1555 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1556 mb_type &= ~MB_TYPE_16x16;
1558 if (USES_LIST(mb_type, 0)) {
1559 s->field_select[0][0] = get_bits1(&s->gb);
1560 s->field_select[0][1] = get_bits1(&s->gb);
1562 if (USES_LIST(mb_type, 1)) {
1563 s->field_select[1][0] = get_bits1(&s->gb);
1564 s->field_select[1][1] = get_bits1(&s->gb);
1570 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1571 s->mv_type = MV_TYPE_16X16;
1573 if (USES_LIST(mb_type, 0)) {
1574 s->mv_dir = MV_DIR_FORWARD;
1576 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1577 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1578 s->last_mv[0][1][0] =
1579 s->last_mv[0][0][0] =
1580 s->mv[0][0][0] = mx;
1581 s->last_mv[0][1][1] =
1582 s->last_mv[0][0][1] =
1583 s->mv[0][0][1] = my;
1586 if (USES_LIST(mb_type, 1)) {
1587 s->mv_dir |= MV_DIR_BACKWARD;
1589 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1590 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1591 s->last_mv[1][1][0] =
1592 s->last_mv[1][0][0] =
1593 s->mv[1][0][0] = mx;
1594 s->last_mv[1][1][1] =
1595 s->last_mv[1][0][1] =
1596 s->mv[1][0][1] = my;
1598 } else if (!IS_DIRECT(mb_type)) {
1599 s->mv_type = MV_TYPE_FIELD;
1601 if (USES_LIST(mb_type, 0)) {
1602 s->mv_dir = MV_DIR_FORWARD;
1604 for (i = 0; i < 2; i++) {
1605 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1606 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1607 s->last_mv[0][i][0] =
1608 s->mv[0][i][0] = mx;
1609 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1613 if (USES_LIST(mb_type, 1)) {
1614 s->mv_dir |= MV_DIR_BACKWARD;
1616 for (i = 0; i < 2; i++) {
1617 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1618 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1619 s->last_mv[1][i][0] =
1620 s->mv[1][i][0] = mx;
1621 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1627 if (IS_DIRECT(mb_type)) {
1628 if (IS_SKIP(mb_type)) {
1632 mx = ff_h263_decode_motion(s, 0, 1);
1633 my = ff_h263_decode_motion(s, 0, 1);
1636 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1637 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1639 s->current_picture.mb_type[xy] = mb_type;
1640 } else { /* I-Frame */
1642 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1644 av_log(s->avctx, AV_LOG_ERROR,
1645 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1648 } while (cbpc == 8);
1654 s->ac_pred = get_bits1(&s->gb);
1656 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1658 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1660 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1662 av_log(s->avctx, AV_LOG_ERROR,
1663 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1666 cbp = (cbpc & 3) | (cbpy << 2);
1668 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1671 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1673 if (!s->progressive_sequence)
1674 s->interlaced_dct = get_bits1(&s->gb);
1676 s->bdsp.clear_blocks(s->block[0]);
1677 /* decode each block */
1678 for (i = 0; i < 6; i++) {
1679 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1686 /* decode each block */
1687 for (i = 0; i < 6; i++) {
1688 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1694 /* per-MB end of slice check */
1695 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1696 int next = mpeg4_is_resync(ctx);
1698 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1700 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1703 if (s->pict_type == AV_PICTURE_TYPE_B) {
1704 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1705 ff_thread_await_progress(&s->next_picture_ptr->tf,
1706 (s->mb_x + delta >= s->mb_width)
1707 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1709 if (s->next_picture.mbskip_table[xy + delta])
1720 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1722 int hours, minutes, seconds;
1724 if (!show_bits(gb, 23)) {
1725 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1729 hours = get_bits(gb, 5);
1730 minutes = get_bits(gb, 6);
1731 check_marker(s->avctx, gb, "in gop_header");
1732 seconds = get_bits(gb, 6);
1734 s->time_base = seconds + 60*(minutes + 60*hours);
1742 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1745 s->avctx->profile = get_bits(gb, 4);
1746 s->avctx->level = get_bits(gb, 4);
1748 // for Simple profile, level 0
1749 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1750 s->avctx->level = 0;
1756 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1758 MpegEncContext *s = &ctx->m;
1759 int width, height, vo_ver_id;
1762 skip_bits(gb, 1); /* random access */
1763 s->vo_type = get_bits(gb, 8);
1764 if (get_bits1(gb) != 0) { /* is_ol_id */
1765 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1766 skip_bits(gb, 3); /* vo_priority */
1770 s->aspect_ratio_info = get_bits(gb, 4);
1771 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1772 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1773 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1775 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1778 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1779 int chroma_format = get_bits(gb, 2);
1780 if (chroma_format != CHROMA_420)
1781 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1783 s->low_delay = get_bits1(gb);
1784 if (get_bits1(gb)) { /* vbv parameters */
1785 get_bits(gb, 15); /* first_half_bitrate */
1786 check_marker(s->avctx, gb, "after first_half_bitrate");
1787 get_bits(gb, 15); /* latter_half_bitrate */
1788 check_marker(s->avctx, gb, "after latter_half_bitrate");
1789 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1790 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1791 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1792 get_bits(gb, 11); /* first_half_vbv_occupancy */
1793 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1794 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1795 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1798 /* is setting low delay flag only once the smartest thing to do?
1799 * low delay detection will not be overridden. */
1800 if (s->picture_number == 0) {
1801 switch(s->vo_type) {
1802 case SIMPLE_VO_TYPE:
1803 case ADV_SIMPLE_VO_TYPE:
1812 ctx->shape = get_bits(gb, 2); /* vol shape */
1813 if (ctx->shape != RECT_SHAPE)
1814 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1815 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1816 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1817 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1820 check_marker(s->avctx, gb, "before time_increment_resolution");
1822 s->avctx->framerate.num = get_bits(gb, 16);
1823 if (!s->avctx->framerate.num) {
1824 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1825 return AVERROR_INVALIDDATA;
1828 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1829 if (ctx->time_increment_bits < 1)
1830 ctx->time_increment_bits = 1;
1832 check_marker(s->avctx, gb, "before fixed_vop_rate");
1834 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1835 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1837 s->avctx->framerate.den = 1;
1839 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1843 if (ctx->shape != BIN_ONLY_SHAPE) {
1844 if (ctx->shape == RECT_SHAPE) {
1845 check_marker(s->avctx, gb, "before width");
1846 width = get_bits(gb, 13);
1847 check_marker(s->avctx, gb, "before height");
1848 height = get_bits(gb, 13);
1849 check_marker(s->avctx, gb, "after height");
1850 if (width && height && /* they should be non zero but who knows */
1851 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1852 if (s->width && s->height &&
1853 (s->width != width || s->height != height))
1854 s->context_reinit = 1;
1860 s->progressive_sequence =
1861 s->progressive_frame = get_bits1(gb) ^ 1;
1862 s->interlaced_dct = 0;
1863 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1864 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1865 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1867 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1869 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1871 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1872 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1873 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1874 ctx->vol_sprite_usage == GMC_SPRITE) {
1875 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1876 skip_bits(gb, 13); // sprite_width
1877 check_marker(s->avctx, gb, "after sprite_width");
1878 skip_bits(gb, 13); // sprite_height
1879 check_marker(s->avctx, gb, "after sprite_height");
1880 skip_bits(gb, 13); // sprite_left
1881 check_marker(s->avctx, gb, "after sprite_left");
1882 skip_bits(gb, 13); // sprite_top
1883 check_marker(s->avctx, gb, "after sprite_top");
1885 ctx->num_sprite_warping_points = get_bits(gb, 6);
1886 if (ctx->num_sprite_warping_points > 3) {
1887 av_log(s->avctx, AV_LOG_ERROR,
1888 "%d sprite_warping_points\n",
1889 ctx->num_sprite_warping_points);
1890 ctx->num_sprite_warping_points = 0;
1891 return AVERROR_INVALIDDATA;
1893 s->sprite_warping_accuracy = get_bits(gb, 2);
1894 ctx->sprite_brightness_change = get_bits1(gb);
1895 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1896 skip_bits1(gb); // low_latency_sprite
1898 // FIXME sadct disable bit if verid!=1 && shape not rect
1900 if (get_bits1(gb) == 1) { /* not_8_bit */
1901 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1902 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1903 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1904 if (s->quant_precision != 5)
1905 av_log(s->avctx, AV_LOG_ERROR,
1906 "quant precision %d\n", s->quant_precision);
1907 if (s->quant_precision<3 || s->quant_precision>9) {
1908 s->quant_precision = 5;
1911 s->quant_precision = 5;
1914 // FIXME a bunch of grayscale shape things
1916 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1919 /* load default matrixes */
1920 for (i = 0; i < 64; i++) {
1921 int j = s->idsp.idct_permutation[i];
1922 v = ff_mpeg4_default_intra_matrix[i];
1923 s->intra_matrix[j] = v;
1924 s->chroma_intra_matrix[j] = v;
1926 v = ff_mpeg4_default_non_intra_matrix[i];
1927 s->inter_matrix[j] = v;
1928 s->chroma_inter_matrix[j] = v;
1931 /* load custom intra matrix */
1932 if (get_bits1(gb)) {
1934 for (i = 0; i < 64; i++) {
1936 if (get_bits_left(gb) < 8) {
1937 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1938 return AVERROR_INVALIDDATA;
1940 v = get_bits(gb, 8);
1945 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1946 s->intra_matrix[j] = last;
1947 s->chroma_intra_matrix[j] = last;
1950 /* replicate last value */
1951 for (; i < 64; i++) {
1952 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1953 s->intra_matrix[j] = last;
1954 s->chroma_intra_matrix[j] = last;
1958 /* load custom non intra matrix */
1959 if (get_bits1(gb)) {
1961 for (i = 0; i < 64; i++) {
1963 if (get_bits_left(gb) < 8) {
1964 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1965 return AVERROR_INVALIDDATA;
1967 v = get_bits(gb, 8);
1972 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1973 s->inter_matrix[j] = v;
1974 s->chroma_inter_matrix[j] = v;
1977 /* replicate last value */
1978 for (; i < 64; i++) {
1979 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1980 s->inter_matrix[j] = last;
1981 s->chroma_inter_matrix[j] = last;
1985 // FIXME a bunch of grayscale shape things
1989 s->quarter_sample = get_bits1(gb);
1991 s->quarter_sample = 0;
1993 if (get_bits_left(gb) < 4) {
1994 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1995 return AVERROR_INVALIDDATA;
1998 if (!get_bits1(gb)) {
1999 int pos = get_bits_count(gb);
2000 int estimation_method = get_bits(gb, 2);
2001 if (estimation_method < 2) {
2002 if (!get_bits1(gb)) {
2003 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
2004 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
2005 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
2006 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2007 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2008 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2010 if (!get_bits1(gb)) {
2011 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2012 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2013 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2014 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2016 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2017 skip_bits_long(gb, pos - get_bits_count(gb));
2020 if (!get_bits1(gb)) {
2021 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2022 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2023 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2024 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2026 if (!get_bits1(gb)) {
2027 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2028 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2029 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2030 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2031 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2032 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2034 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2035 skip_bits_long(gb, pos - get_bits_count(gb));
2038 if (estimation_method == 1) {
2039 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2040 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2043 av_log(s->avctx, AV_LOG_ERROR,
2044 "Invalid Complexity estimation method %d\n",
2049 ctx->cplx_estimation_trash_i =
2050 ctx->cplx_estimation_trash_p =
2051 ctx->cplx_estimation_trash_b = 0;
2054 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2056 s->data_partitioning = get_bits1(gb);
2057 if (s->data_partitioning)
2058 ctx->rvlc = get_bits1(gb);
2060 if (vo_ver_id != 1) {
2061 ctx->new_pred = get_bits1(gb);
2062 if (ctx->new_pred) {
2063 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2064 skip_bits(gb, 2); /* requested upstream message type */
2065 skip_bits1(gb); /* newpred segment type */
2067 if (get_bits1(gb)) // reduced_res_vop
2068 av_log(s->avctx, AV_LOG_ERROR,
2069 "reduced resolution VOP not supported\n");
2074 ctx->scalability = get_bits1(gb);
2076 if (ctx->scalability) {
2077 GetBitContext bak = *gb;
2078 int h_sampling_factor_n;
2079 int h_sampling_factor_m;
2080 int v_sampling_factor_n;
2081 int v_sampling_factor_m;
2083 skip_bits1(gb); // hierarchy_type
2084 skip_bits(gb, 4); /* ref_layer_id */
2085 skip_bits1(gb); /* ref_layer_sampling_dir */
2086 h_sampling_factor_n = get_bits(gb, 5);
2087 h_sampling_factor_m = get_bits(gb, 5);
2088 v_sampling_factor_n = get_bits(gb, 5);
2089 v_sampling_factor_m = get_bits(gb, 5);
2090 ctx->enhancement_type = get_bits1(gb);
2092 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2093 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2094 /* illegal scalability header (VERY broken encoder),
2095 * trying to workaround */
2096 ctx->scalability = 0;
2099 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2101 // bin shape stuff FIXME
2105 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2106 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",
2107 s->avctx->framerate.den, s->avctx->framerate.num,
2108 ctx->time_increment_bits,
2110 s->progressive_sequence,
2112 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2113 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2121 * Decode the user data stuff in the header.
2122 * Also initializes divx/xvid/lavc_version/build.
2124 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2126 MpegEncContext *s = &ctx->m;
2130 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2133 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2134 if (show_bits(gb, 23) == 0)
2136 buf[i] = get_bits(gb, 8);
2140 /* divx detection */
2141 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2143 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2145 ctx->divx_version = ver;
2146 ctx->divx_build = build;
2147 s->divx_packed = e == 3 && last == 'p';
2150 /* libavcodec detection */
2151 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2153 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2155 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2157 build = (ver << 16) + (ver2 << 8) + ver3;
2160 if (strcmp(buf, "ffmpeg") == 0)
2161 ctx->lavc_build = 4600;
2164 ctx->lavc_build = build;
2166 /* Xvid detection */
2167 e = sscanf(buf, "XviD%d", &build);
2169 ctx->xvid_build = build;
2174 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2176 Mpeg4DecContext *ctx = avctx->priv_data;
2177 MpegEncContext *s = &ctx->m;
2179 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2180 if (s->codec_tag == AV_RL32("XVID") ||
2181 s->codec_tag == AV_RL32("XVIX") ||
2182 s->codec_tag == AV_RL32("RMP4") ||
2183 s->codec_tag == AV_RL32("ZMP4") ||
2184 s->codec_tag == AV_RL32("SIPP"))
2185 ctx->xvid_build = 0;
2188 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2189 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2190 ctx->vol_control_parameters == 0)
2191 ctx->divx_version = 400; // divx 4
2193 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2195 ctx->divx_build = -1;
2198 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2199 if (s->codec_tag == AV_RL32("XVIX"))
2200 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2202 if (s->codec_tag == AV_RL32("UMP4"))
2203 s->workaround_bugs |= FF_BUG_UMP4;
2205 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2206 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2208 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2209 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2211 if (ctx->xvid_build <= 3U)
2212 s->padding_bug_score = 256 * 256 * 256 * 64;
2214 if (ctx->xvid_build <= 1U)
2215 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2217 if (ctx->xvid_build <= 12U)
2218 s->workaround_bugs |= FF_BUG_EDGE;
2220 if (ctx->xvid_build <= 32U)
2221 s->workaround_bugs |= FF_BUG_DC_CLIP;
2223 #define SET_QPEL_FUNC(postfix1, postfix2) \
2224 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2225 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2226 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2228 if (ctx->lavc_build < 4653U)
2229 s->workaround_bugs |= FF_BUG_STD_QPEL;
2231 if (ctx->lavc_build < 4655U)
2232 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2234 if (ctx->lavc_build < 4670U)
2235 s->workaround_bugs |= FF_BUG_EDGE;
2237 if (ctx->lavc_build <= 4712U)
2238 s->workaround_bugs |= FF_BUG_DC_CLIP;
2240 if ((ctx->lavc_build&0xFF) >= 100) {
2241 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2242 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2244 s->workaround_bugs |= FF_BUG_IEDGE;
2247 if (ctx->divx_version >= 0)
2248 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2249 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2250 s->padding_bug_score = 256 * 256 * 256 * 64;
2252 if (ctx->divx_version < 500U)
2253 s->workaround_bugs |= FF_BUG_EDGE;
2255 if (ctx->divx_version >= 0)
2256 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2259 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2260 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2261 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2262 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2263 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2264 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2265 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2267 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2268 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2269 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2270 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2271 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2272 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2275 if (avctx->debug & FF_DEBUG_BUGS)
2276 av_log(s->avctx, AV_LOG_DEBUG,
2277 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2278 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2279 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2281 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2282 s->codec_id == AV_CODEC_ID_MPEG4 &&
2283 avctx->idct_algo == FF_IDCT_AUTO) {
2284 avctx->idct_algo = FF_IDCT_XVID;
2285 ff_mpv_idct_init(s);
2292 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2294 MpegEncContext *s = &ctx->m;
2295 int time_incr, time_increment;
2299 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2300 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2301 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2302 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2306 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2307 if (s->partitioned_frame)
2308 s->decode_mb = mpeg4_decode_partitioned_mb;
2310 s->decode_mb = mpeg4_decode_mb;
2313 while (get_bits1(gb) != 0)
2316 check_marker(s->avctx, gb, "before time_increment");
2318 if (ctx->time_increment_bits == 0 ||
2319 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2320 av_log(s->avctx, AV_LOG_WARNING,
2321 "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);
2323 for (ctx->time_increment_bits = 1;
2324 ctx->time_increment_bits < 16;
2325 ctx->time_increment_bits++) {
2326 if (s->pict_type == AV_PICTURE_TYPE_P ||
2327 (s->pict_type == AV_PICTURE_TYPE_S &&
2328 ctx->vol_sprite_usage == GMC_SPRITE)) {
2329 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2331 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2335 av_log(s->avctx, AV_LOG_WARNING,
2336 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2337 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2338 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2339 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2344 time_increment = get_bits1(gb); // FIXME investigate further
2346 time_increment = get_bits(gb, ctx->time_increment_bits);
2348 if (s->pict_type != AV_PICTURE_TYPE_B) {
2349 s->last_time_base = s->time_base;
2350 s->time_base += time_incr;
2351 s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
2352 if (s->workaround_bugs & FF_BUG_UMP4) {
2353 if (s->time < s->last_non_b_time) {
2354 /* header is not mpeg-4-compatible, broken encoder,
2355 * trying to workaround */
2357 s->time += s->avctx->framerate.num;
2360 s->pp_time = s->time - s->last_non_b_time;
2361 s->last_non_b_time = s->time;
2363 s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
2364 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2365 if (s->pp_time <= s->pb_time ||
2366 s->pp_time <= s->pp_time - s->pb_time ||
2368 /* messed up order, maybe after seeking? skipping current B-frame */
2369 return FRAME_SKIPPED;
2371 ff_mpeg4_init_direct_mv(s);
2373 if (ctx->t_frame == 0)
2374 ctx->t_frame = s->pb_time;
2375 if (ctx->t_frame == 0)
2376 ctx->t_frame = 1; // 1/0 protection
2377 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2378 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2379 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2380 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2381 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2382 s->pb_field_time = 2;
2383 s->pp_field_time = 4;
2384 if (!s->progressive_sequence)
2385 return FRAME_SKIPPED;
2389 if (s->avctx->framerate.den)
2390 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2392 pts = AV_NOPTS_VALUE;
2393 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2395 check_marker(s->avctx, gb, "before vop_coded");
2398 if (get_bits1(gb) != 1) {
2399 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2400 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2401 return FRAME_SKIPPED;
2404 decode_new_pred(ctx, gb);
2406 if (ctx->shape != BIN_ONLY_SHAPE &&
2407 (s->pict_type == AV_PICTURE_TYPE_P ||
2408 (s->pict_type == AV_PICTURE_TYPE_S &&
2409 ctx->vol_sprite_usage == GMC_SPRITE))) {
2410 /* rounding type for motion estimation */
2411 s->no_rounding = get_bits1(gb);
2415 // FIXME reduced res stuff
2417 if (ctx->shape != RECT_SHAPE) {
2418 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2419 skip_bits(gb, 13); /* width */
2420 check_marker(s->avctx, gb, "after width");
2421 skip_bits(gb, 13); /* height */
2422 check_marker(s->avctx, gb, "after height");
2423 skip_bits(gb, 13); /* hor_spat_ref */
2424 check_marker(s->avctx, gb, "after hor_spat_ref");
2425 skip_bits(gb, 13); /* ver_spat_ref */
2427 skip_bits1(gb); /* change_CR_disable */
2429 if (get_bits1(gb) != 0)
2430 skip_bits(gb, 8); /* constant_alpha_value */
2433 // FIXME complexity estimation stuff
2435 if (ctx->shape != BIN_ONLY_SHAPE) {
2436 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2437 if (s->pict_type != AV_PICTURE_TYPE_I)
2438 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2439 if (s->pict_type == AV_PICTURE_TYPE_B)
2440 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2442 if (get_bits_left(gb) < 3) {
2443 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2444 return AVERROR_INVALIDDATA;
2446 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2447 if (!s->progressive_sequence) {
2448 s->top_field_first = get_bits1(gb);
2449 s->alternate_scan = get_bits1(gb);
2451 s->alternate_scan = 0;
2454 if (s->alternate_scan) {
2455 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2456 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2457 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2458 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2460 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2461 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2462 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2463 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2466 if (s->pict_type == AV_PICTURE_TYPE_S) {
2467 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2468 ctx->vol_sprite_usage == GMC_SPRITE)) {
2469 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2470 return AVERROR_INVALIDDATA;
2471 if (ctx->sprite_brightness_change)
2472 av_log(s->avctx, AV_LOG_ERROR,
2473 "sprite_brightness_change not supported\n");
2474 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2475 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2477 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2478 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2482 if (ctx->shape != BIN_ONLY_SHAPE) {
2483 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2484 if (s->qscale == 0) {
2485 av_log(s->avctx, AV_LOG_ERROR,
2486 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2487 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2490 if (s->pict_type != AV_PICTURE_TYPE_I) {
2491 s->f_code = get_bits(gb, 3); /* fcode_for */
2492 if (s->f_code == 0) {
2493 av_log(s->avctx, AV_LOG_ERROR,
2494 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2496 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2501 if (s->pict_type == AV_PICTURE_TYPE_B) {
2502 s->b_code = get_bits(gb, 3);
2503 if (s->b_code == 0) {
2504 av_log(s->avctx, AV_LOG_ERROR,
2505 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2507 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2512 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2513 av_log(s->avctx, AV_LOG_DEBUG,
2514 "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",
2515 s->qscale, s->f_code, s->b_code,
2516 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")),
2517 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2518 s->top_field_first, s->quarter_sample ? "q" : "h",
2519 s->data_partitioning, ctx->resync_marker,
2520 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2521 1 - s->no_rounding, s->vo_type,
2522 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2523 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2524 ctx->cplx_estimation_trash_b,
2530 if (!ctx->scalability) {
2531 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2532 skip_bits1(gb); // vop shape coding type
2534 if (ctx->enhancement_type) {
2535 int load_backward_shape = get_bits1(gb);
2536 if (load_backward_shape)
2537 av_log(s->avctx, AV_LOG_ERROR,
2538 "load backward shape isn't supported\n");
2540 skip_bits(gb, 2); // ref_select_code
2543 /* detect buggy encoders which don't set the low_delay flag
2544 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2545 * easily (although it's buggy too) */
2546 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2547 ctx->divx_version == -1 && s->picture_number == 0) {
2548 av_log(s->avctx, AV_LOG_WARNING,
2549 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2553 s->picture_number++; // better than pic number==0 always ;)
2555 // FIXME add short header support
2556 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2557 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2559 if (s->workaround_bugs & FF_BUG_EDGE) {
2560 s->h_edge_pos = s->width;
2561 s->v_edge_pos = s->height;
2567 * Decode MPEG-4 headers.
2568 * @return <0 if no VOP found (or a damaged one)
2569 * FRAME_SKIPPED if a not coded VOP is found
2570 * 0 if a VOP is found
2572 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2574 MpegEncContext *s = &ctx->m;
2575 unsigned startcode, v;
2579 /* search next start code */
2582 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2584 if (get_bits(gb, 8) == 0xF0)
2590 if (get_bits_count(gb) >= gb->size_in_bits) {
2591 if (gb->size_in_bits == 8 &&
2592 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2593 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2594 return FRAME_SKIPPED; // divx bug
2596 return -1; // end of stream
2599 /* use the bits after the test */
2600 v = get_bits(gb, 8);
2601 startcode = ((startcode << 8) | v) & 0xffffffff;
2603 if ((startcode & 0xFFFFFF00) != 0x100)
2604 continue; // no startcode
2606 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2607 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2608 if (startcode <= 0x11F)
2609 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2610 else if (startcode <= 0x12F)
2611 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2612 else if (startcode <= 0x13F)
2613 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2614 else if (startcode <= 0x15F)
2615 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2616 else if (startcode <= 0x1AF)
2617 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2618 else if (startcode == 0x1B0)
2619 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2620 else if (startcode == 0x1B1)
2621 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2622 else if (startcode == 0x1B2)
2623 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2624 else if (startcode == 0x1B3)
2625 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2626 else if (startcode == 0x1B4)
2627 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2628 else if (startcode == 0x1B5)
2629 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2630 else if (startcode == 0x1B6)
2631 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2632 else if (startcode == 0x1B7)
2633 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2634 else if (startcode == 0x1B8)
2635 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2636 else if (startcode == 0x1B9)
2637 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2638 else if (startcode == 0x1BA)
2639 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2640 else if (startcode == 0x1BB)
2641 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2642 else if (startcode == 0x1BC)
2643 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2644 else if (startcode == 0x1BD)
2645 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2646 else if (startcode == 0x1BE)
2647 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2648 else if (startcode == 0x1BF)
2649 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2650 else if (startcode == 0x1C0)
2651 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2652 else if (startcode == 0x1C1)
2653 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2654 else if (startcode == 0x1C2)
2655 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2656 else if (startcode == 0x1C3)
2657 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2658 else if (startcode <= 0x1C5)
2659 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2660 else if (startcode <= 0x1FF)
2661 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2662 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2665 if (startcode >= 0x120 && startcode <= 0x12F) {
2667 av_log(s->avctx, AV_LOG_ERROR, "Multiple VOL headers");
2668 return AVERROR_INVALIDDATA;
2671 if ((ret = decode_vol_header(ctx, gb)) < 0)
2673 } else if (startcode == USER_DATA_STARTCODE) {
2674 decode_user_data(ctx, gb);
2675 } else if (startcode == GOP_STARTCODE) {
2676 mpeg4_decode_gop_header(s, gb);
2677 } else if (startcode == VOS_STARTCODE) {
2678 mpeg4_decode_profile_level(s, gb);
2679 } else if (startcode == VOP_STARTCODE) {
2688 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2690 s->avctx->has_b_frames = !s->low_delay;
2692 return decode_vop_header(ctx, gb);
2695 av_cold void ff_mpeg4videodec_static_init(void) {
2696 static int done = 0;
2699 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2700 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2701 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2702 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2703 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2704 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2705 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2706 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2707 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2708 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2709 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2710 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2711 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2712 &ff_sprite_trajectory_tab[0][1], 4, 2,
2713 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2714 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2715 &ff_mb_type_b_tab[0][1], 2, 1,
2716 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2721 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2723 Mpeg4DecContext *ctx = avctx->priv_data;
2724 MpegEncContext *s = &ctx->m;
2726 /* divx 5.01+ bitstream reorder stuff */
2727 /* Since this clobbers the input buffer and hwaccel codecs still need the
2728 * data during hwaccel->end_frame we should not do this any earlier */
2729 if (s->divx_packed) {
2730 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2731 int startcode_found = 0;
2733 if (buf_size - current_pos > 7) {
2736 for (i = current_pos; i < buf_size - 4; i++)
2741 buf[i + 3] == 0xB6) {
2742 startcode_found = !(buf[i + 4] & 0x40);
2747 if (startcode_found) {
2748 if (!ctx->showed_packed_warning) {
2749 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2750 "wasteful way to store B-frames ('packed B-frames'). "
2751 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2752 ctx->showed_packed_warning = 1;
2754 av_fast_padded_malloc(&s->bitstream_buffer,
2755 &s->allocated_bitstream_buffer_size,
2756 buf_size - current_pos);
2757 if (!s->bitstream_buffer) {
2758 s->bitstream_buffer_size = 0;
2759 return AVERROR(ENOMEM);
2761 memcpy(s->bitstream_buffer, buf + current_pos,
2762 buf_size - current_pos);
2763 s->bitstream_buffer_size = buf_size - current_pos;
2771 static int mpeg4_update_thread_context(AVCodecContext *dst,
2772 const AVCodecContext *src)
2774 Mpeg4DecContext *s = dst->priv_data;
2775 const Mpeg4DecContext *s1 = src->priv_data;
2776 int init = s->m.context_initialized;
2778 int ret = ff_mpeg_update_thread_context(dst, src);
2783 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2785 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2786 ff_xvid_idct_init(&s->m.idsp, dst);
2792 static av_cold int decode_init(AVCodecContext *avctx)
2794 Mpeg4DecContext *ctx = avctx->priv_data;
2795 MpegEncContext *s = &ctx->m;
2801 ctx->lavc_build = -1;
2803 if ((ret = ff_h263_decode_init(avctx)) < 0)
2806 ff_mpeg4videodec_static_init();
2809 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2810 s->decode_mb = mpeg4_decode_mb;
2811 ctx->time_increment_bits = 4; /* default value for broken headers */
2813 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2814 avctx->internal->allocate_progress = 1;
2819 static const AVOption mpeg4_options[] = {
2820 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2821 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2825 static const AVClass mpeg4_class = {
2826 .class_name = "MPEG4 Video Decoder",
2827 .item_name = av_default_item_name,
2828 .option = mpeg4_options,
2829 .version = LIBAVUTIL_VERSION_INT,
2832 AVCodec ff_mpeg4_decoder = {
2834 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2835 .type = AVMEDIA_TYPE_VIDEO,
2836 .id = AV_CODEC_ID_MPEG4,
2837 .priv_data_size = sizeof(Mpeg4DecContext),
2838 .init = decode_init,
2839 .close = ff_h263_decode_end,
2840 .decode = ff_h263_decode_frame,
2841 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2842 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2843 AV_CODEC_CAP_FRAME_THREADS,
2844 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2845 .flush = ff_mpeg_flush,
2847 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2848 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2849 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2850 .priv_class = &mpeg4_class,