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/opt.h"
26 #include "error_resilience.h"
28 #include "mpegvideo.h"
29 #include "mpeg4video.h"
33 /* The defines below define the number of bits that are read at once for
34 * reading vlc values. Changing these may improve speed and data cache needs
35 * be aware though that decreasing them may need the number of stages that is
36 * passed to get_vlc* to be increased. */
37 #define SPRITE_TRAJ_VLC_BITS 6
39 #define MB_TYPE_B_VLC_BITS 4
41 static VLC dc_lum, dc_chrom;
42 static VLC sprite_trajectory;
43 static VLC mb_type_b_vlc;
45 static const int mb_type_b_map[4] = {
46 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
47 MB_TYPE_L0L1 | MB_TYPE_16x16,
48 MB_TYPE_L1 | MB_TYPE_16x16,
49 MB_TYPE_L0 | MB_TYPE_16x16,
54 * @param n block index (0-3 are luma, 4-5 are chroma)
55 * @param dir the ac prediction direction
57 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
60 int16_t *ac_val, *ac_val1;
61 int8_t *const qscale_table = s->current_picture.qscale_table;
64 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
68 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
72 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
75 for (i = 1; i < 8; i++)
76 block[s->dsp.idct_permutation[i << 3]] += ac_val[i];
78 /* different qscale, we must rescale */
79 for (i = 1; i < 8; i++)
80 block[s->dsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
83 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
85 ac_val -= 16 * s->block_wrap[n];
87 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
90 for (i = 1; i < 8; i++)
91 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
93 /* different qscale, we must rescale */
94 for (i = 1; i < 8; i++)
95 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
100 for (i = 1; i < 8; i++)
101 ac_val1[i] = block[s->dsp.idct_permutation[i << 3]];
104 for (i = 1; i < 8; i++)
105 ac_val1[8 + i] = block[s->dsp.idct_permutation[i]];
109 * check if the next stuff is a resync marker or the end.
112 static inline int mpeg4_is_resync(MpegEncContext *s)
114 int bits_count = get_bits_count(&s->gb);
115 int v = show_bits(&s->gb, 16);
117 if (s->workaround_bugs & FF_BUG_NO_PADDING && !s->resync_marker)
121 if (s->pict_type == AV_PICTURE_TYPE_B ||
122 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
124 skip_bits(&s->gb, 8 + s->pict_type);
125 bits_count += 8 + s->pict_type;
126 v = show_bits(&s->gb, 16);
129 if (bits_count + 8 >= s->gb.size_in_bits) {
131 v |= 0x7F >> (7 - (bits_count & 7));
136 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
138 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
139 GetBitContext gb = s->gb;
141 skip_bits(&s->gb, 1);
142 align_get_bits(&s->gb);
144 for (len = 0; len < 32; len++)
145 if (get_bits1(&s->gb))
148 mb_num = get_bits(&s->gb, mb_num_bits);
149 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
154 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
161 static int mpeg4_decode_sprite_trajectory(MpegEncContext *s, GetBitContext *gb)
163 int a = 2 << s->sprite_warping_accuracy;
164 int rho = 3 - s->sprite_warping_accuracy;
170 int min_ab, i, w2, h2, w3, h3;
171 int sprite_ref[4][2];
172 int virtual_ref[2][2];
174 // only true for rectangle shapes
175 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
176 { 0, s->height }, { s->width, s->height } };
177 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
179 if (w <= 0 || h <= 0)
180 return AVERROR_INVALIDDATA;
182 for (i = 0; i < s->num_sprite_warping_points; i++) {
186 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
188 x = get_xbits(gb, length);
190 if (!(s->divx_version == 500 && s->divx_build == 413))
191 skip_bits1(gb); /* marker bit */
193 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
195 y = get_xbits(gb, length);
197 skip_bits1(gb); /* marker bit */
198 s->sprite_traj[i][0] = d[i][0] = x;
199 s->sprite_traj[i][1] = d[i][1] = y;
202 s->sprite_traj[i][0] = s->sprite_traj[i][1] = 0;
204 while ((1 << alpha) < w)
206 while ((1 << beta) < h)
207 beta++; /* typo in the mpeg4 std for the definition of w' and h' */
211 // Note, the 4th point isn't used for GMC
212 if (s->divx_version == 500 && s->divx_build == 413) {
213 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
214 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
215 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
216 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
217 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
218 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
220 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
221 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
222 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
223 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
224 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
225 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
227 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
228 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
230 /* this is mostly identical to the mpeg4 std (and is totally unreadable
231 * because of that...). Perhaps it should be reordered to be more readable.
232 * The idea behind this virtual_ref mess is to be able to use shifts later
233 * per pixel instead of divides so the distance between points is converted
234 * from w&h based to w2&h2 based which are of the 2^x form. */
235 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
236 ROUNDED_DIV(((w - w2) *
237 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
238 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
239 virtual_ref[0][1] = 16 * vop_ref[0][1] +
240 ROUNDED_DIV(((w - w2) *
241 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
242 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
243 virtual_ref[1][0] = 16 * vop_ref[0][0] +
244 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
245 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
246 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
247 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
248 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
250 switch (s->num_sprite_warping_points) {
252 s->sprite_offset[0][0] =
253 s->sprite_offset[0][1] =
254 s->sprite_offset[1][0] =
255 s->sprite_offset[1][1] = 0;
256 s->sprite_delta[0][0] = a;
257 s->sprite_delta[0][1] =
258 s->sprite_delta[1][0] = 0;
259 s->sprite_delta[1][1] = a;
261 s->sprite_shift[1] = 0;
264 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
265 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
266 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
267 a * (vop_ref[0][0] / 2);
268 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
269 a * (vop_ref[0][1] / 2);
270 s->sprite_delta[0][0] = a;
271 s->sprite_delta[0][1] =
272 s->sprite_delta[1][0] = 0;
273 s->sprite_delta[1][1] = a;
275 s->sprite_shift[1] = 0;
278 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
279 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
281 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
282 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
283 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
284 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
286 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
287 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
288 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289 (-2 * vop_ref[0][0] + 1) +
290 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
291 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
292 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
293 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
294 (-2 * vop_ref[0][0] + 1) +
295 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
296 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
297 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
298 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
299 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
300 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
301 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
303 s->sprite_shift[0] = alpha + rho;
304 s->sprite_shift[1] = alpha + rho + 2;
307 min_ab = FFMIN(alpha, beta);
310 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
311 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
312 h3 * (-vop_ref[0][0]) +
313 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
314 w3 * (-vop_ref[0][1]) +
315 (1 << (alpha + beta + rho - min_ab - 1));
316 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
317 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
318 h3 * (-vop_ref[0][0]) +
319 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
320 w3 * (-vop_ref[0][1]) +
321 (1 << (alpha + beta + rho - min_ab - 1));
322 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
323 h3 * (-2 * vop_ref[0][0] + 1) +
324 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
325 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
326 r * sprite_ref[0][0] - 16 * w2 * h3 +
327 (1 << (alpha + beta + rho - min_ab + 1));
328 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
329 h3 * (-2 * vop_ref[0][0] + 1) +
330 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
331 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
332 r * sprite_ref[0][1] - 16 * w2 * h3 +
333 (1 << (alpha + beta + rho - min_ab + 1));
334 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
335 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
336 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
337 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
339 s->sprite_shift[0] = alpha + beta + rho - min_ab;
340 s->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
343 /* try to simplify the situation */
344 if (s->sprite_delta[0][0] == a << s->sprite_shift[0] &&
345 s->sprite_delta[0][1] == 0 &&
346 s->sprite_delta[1][0] == 0 &&
347 s->sprite_delta[1][1] == a << s->sprite_shift[0]) {
348 s->sprite_offset[0][0] >>= s->sprite_shift[0];
349 s->sprite_offset[0][1] >>= s->sprite_shift[0];
350 s->sprite_offset[1][0] >>= s->sprite_shift[1];
351 s->sprite_offset[1][1] >>= s->sprite_shift[1];
352 s->sprite_delta[0][0] = a;
353 s->sprite_delta[0][1] = 0;
354 s->sprite_delta[1][0] = 0;
355 s->sprite_delta[1][1] = a;
356 s->sprite_shift[0] = 0;
357 s->sprite_shift[1] = 0;
358 s->real_sprite_warping_points = 1;
360 int shift_y = 16 - s->sprite_shift[0];
361 int shift_c = 16 - s->sprite_shift[1];
362 for (i = 0; i < 2; i++) {
363 s->sprite_offset[0][i] <<= shift_y;
364 s->sprite_offset[1][i] <<= shift_c;
365 s->sprite_delta[0][i] <<= shift_y;
366 s->sprite_delta[1][i] <<= shift_y;
367 s->sprite_shift[i] = 16;
369 s->real_sprite_warping_points = s->num_sprite_warping_points;
375 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
376 int len = FFMIN(ctx->time_increment_bits + 3, 15);
381 check_marker(gb, "after new_pred");
387 * Decode the next video packet.
388 * @return <0 if something went wrong
390 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
392 MpegEncContext *s = &ctx->m;
394 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
395 int header_extension = 0, mb_num, len;
397 /* is there enough space left for a video packet + header */
398 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
401 for (len = 0; len < 32; len++)
402 if (get_bits1(&s->gb))
405 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
406 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
410 if (ctx->shape != RECT_SHAPE) {
411 header_extension = get_bits1(&s->gb);
412 // FIXME more stuff here
415 mb_num = get_bits(&s->gb, mb_num_bits);
416 if (mb_num >= s->mb_num) {
417 av_log(s->avctx, AV_LOG_ERROR,
418 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
422 s->mb_x = mb_num % s->mb_width;
423 s->mb_y = mb_num / s->mb_width;
425 if (ctx->shape != BIN_ONLY_SHAPE) {
426 int qscale = get_bits(&s->gb, s->quant_precision);
428 s->chroma_qscale = s->qscale = qscale;
431 if (ctx->shape == RECT_SHAPE)
432 header_extension = get_bits1(&s->gb);
434 if (header_extension) {
437 while (get_bits1(&s->gb) != 0)
440 check_marker(&s->gb, "before time_increment in video packed header");
441 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
442 check_marker(&s->gb, "before vop_coding_type in video packed header");
444 skip_bits(&s->gb, 2); /* vop coding type */
445 // FIXME not rect stuff here
447 if (ctx->shape != BIN_ONLY_SHAPE) {
448 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
449 // FIXME don't just ignore everything
450 if (s->pict_type == AV_PICTURE_TYPE_S &&
451 ctx->vol_sprite_usage == GMC_SPRITE) {
452 if (mpeg4_decode_sprite_trajectory(s, &s->gb) < 0)
453 return AVERROR_INVALIDDATA;
454 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
457 // FIXME reduced res stuff here
459 if (s->pict_type != AV_PICTURE_TYPE_I) {
460 int f_code = get_bits(&s->gb, 3); /* fcode_for */
462 av_log(s->avctx, AV_LOG_ERROR,
463 "Error, video packet header damaged (f_code=0)\n");
465 if (s->pict_type == AV_PICTURE_TYPE_B) {
466 int b_code = get_bits(&s->gb, 3);
468 av_log(s->avctx, AV_LOG_ERROR,
469 "Error, video packet header damaged (b_code=0)\n");
474 decode_new_pred(ctx, &s->gb);
480 * Get the average motion vector for a GMC MB.
481 * @param n either 0 for the x component or 1 for y
482 * @return the average MV for a GMC MB
484 static inline int get_amv(MpegEncContext *s, int n)
486 int x, y, mb_v, sum, dx, dy, shift;
487 int len = 1 << (s->f_code + 4);
488 const int a = s->sprite_warping_accuracy;
490 if (s->workaround_bugs & FF_BUG_AMV)
491 len >>= s->quarter_sample;
493 if (s->real_sprite_warping_points == 1) {
494 if (s->divx_version == 500 && s->divx_build == 413)
495 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
497 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
499 dx = s->sprite_delta[n][0];
500 dy = s->sprite_delta[n][1];
501 shift = s->sprite_shift[0];
503 dy -= 1 << (shift + a + 1);
505 dx -= 1 << (shift + a + 1);
506 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
509 for (y = 0; y < 16; y++) {
514 for (x = 0; x < 16; x++) {
519 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
531 * Decode the dc value.
532 * @param n block index (0-3 are luma, 4-5 are chroma)
533 * @param dir_ptr the prediction direction will be stored here
534 * @return the quantized dc
536 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
541 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
543 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
545 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
546 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
555 level = 2 * get_bits1(&s->gb) - 1;
557 if (get_bits1(&s->gb))
558 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
560 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
563 level = get_xbits(&s->gb, code);
567 if (get_bits1(&s->gb) == 0) { /* marker */
568 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
569 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
576 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
580 * Decode first partition.
581 * @return number of MBs decoded or <0 if an error occurred
583 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
585 MpegEncContext *s = &ctx->m;
587 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
589 /* decode first partition */
590 s->first_slice_line = 1;
591 for (; s->mb_y < s->mb_height; s->mb_y++) {
592 ff_init_block_index(s);
593 for (; s->mb_x < s->mb_width; s->mb_x++) {
594 const int xy = s->mb_x + s->mb_y * s->mb_stride;
599 ff_update_block_index(s);
600 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
601 s->first_slice_line = 0;
603 if (s->pict_type == AV_PICTURE_TYPE_I) {
607 if (show_bits_long(&s->gb, 19) == DC_MARKER)
610 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
612 av_log(s->avctx, AV_LOG_ERROR,
613 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
618 s->cbp_table[xy] = cbpc & 3;
619 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
623 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
625 s->current_picture.qscale_table[xy] = s->qscale;
627 s->mbintra_table[xy] = 1;
628 for (i = 0; i < 6; i++) {
630 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
632 av_log(s->avctx, AV_LOG_ERROR,
633 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
640 s->pred_dir_table[xy] = dir;
641 } else { /* P/S_TYPE */
642 int mx, my, pred_x, pred_y, bits;
643 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
644 const int stride = s->b8_stride * 2;
647 bits = show_bits(&s->gb, 17);
648 if (bits == MOTION_MARKER)
652 if (bits & 0x10000) {
654 if (s->pict_type == AV_PICTURE_TYPE_S &&
655 ctx->vol_sprite_usage == GMC_SPRITE) {
656 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
663 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
670 mot_val[0 + stride] =
671 mot_val[2 + stride] = mx;
674 mot_val[1 + stride] =
675 mot_val[3 + stride] = my;
677 if (s->mbintra_table[xy])
678 ff_clean_intra_table_entries(s);
682 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
684 av_log(s->avctx, AV_LOG_ERROR,
685 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
691 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
693 s->mb_intra = ((cbpc & 4) != 0);
696 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
697 s->mbintra_table[xy] = 1;
700 mot_val[0 + stride] =
701 mot_val[2 + stride] = 0;
704 mot_val[1 + stride] =
705 mot_val[3 + stride] = 0;
707 if (s->mbintra_table[xy])
708 ff_clean_intra_table_entries(s);
710 if (s->pict_type == AV_PICTURE_TYPE_S &&
711 ctx->vol_sprite_usage == GMC_SPRITE &&
713 s->mcsel = get_bits1(&s->gb);
717 if ((cbpc & 16) == 0) {
718 /* 16x16 motion prediction */
720 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
722 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
726 my = ff_h263_decode_motion(s, pred_y, s->f_code);
729 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
734 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
741 mot_val[0 + stride] =
742 mot_val[2 + stride] = mx;
745 mot_val[1 + stride] =
746 mot_val[3 + stride] = my;
749 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
751 for (i = 0; i < 4; i++) {
752 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
753 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
757 my = ff_h263_decode_motion(s, pred_y, s->f_code);
774 * decode second partition.
775 * @return <0 if an error occurred
777 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
780 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
782 s->mb_x = s->resync_mb_x;
783 s->first_slice_line = 1;
784 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
785 ff_init_block_index(s);
786 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
787 const int xy = s->mb_x + s->mb_y * s->mb_stride;
790 ff_update_block_index(s);
791 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
792 s->first_slice_line = 0;
794 if (s->pict_type == AV_PICTURE_TYPE_I) {
795 int ac_pred = get_bits1(&s->gb);
796 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
798 av_log(s->avctx, AV_LOG_ERROR,
799 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
803 s->cbp_table[xy] |= cbpy << 2;
804 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
805 } else { /* P || S_TYPE */
806 if (IS_INTRA(s->current_picture.mb_type[xy])) {
809 int ac_pred = get_bits1(&s->gb);
810 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
813 av_log(s->avctx, AV_LOG_ERROR,
814 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
818 if (s->cbp_table[xy] & 8)
819 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
820 s->current_picture.qscale_table[xy] = s->qscale;
822 for (i = 0; i < 6; i++) {
824 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
826 av_log(s->avctx, AV_LOG_ERROR,
827 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
834 s->cbp_table[xy] &= 3; // remove dquant
835 s->cbp_table[xy] |= cbpy << 2;
836 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
837 s->pred_dir_table[xy] = dir;
838 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
839 s->current_picture.qscale_table[xy] = s->qscale;
840 s->cbp_table[xy] = 0;
842 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
845 av_log(s->avctx, AV_LOG_ERROR,
846 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
850 if (s->cbp_table[xy] & 8)
851 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
852 s->current_picture.qscale_table[xy] = s->qscale;
854 s->cbp_table[xy] &= 3; // remove dquant
855 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
859 if (mb_num >= mb_count)
867 * Decode the first and second partition.
868 * @return <0 if error (and sets error type in the error_status_table)
870 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
872 MpegEncContext *s = &ctx->m;
874 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
875 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
877 mb_num = mpeg4_decode_partition_a(ctx);
879 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
880 s->mb_x, s->mb_y, part_a_error);
884 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
885 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
886 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
887 s->mb_x, s->mb_y, part_a_error);
891 s->mb_num_left = mb_num;
893 if (s->pict_type == AV_PICTURE_TYPE_I) {
894 while (show_bits(&s->gb, 9) == 1)
895 skip_bits(&s->gb, 9);
896 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
897 av_log(s->avctx, AV_LOG_ERROR,
898 "marker missing after first I partition at %d %d\n",
903 while (show_bits(&s->gb, 10) == 1)
904 skip_bits(&s->gb, 10);
905 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
906 av_log(s->avctx, AV_LOG_ERROR,
907 "marker missing after first P partition at %d %d\n",
912 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
913 s->mb_x - 1, s->mb_y, part_a_end);
915 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
916 if (s->pict_type == AV_PICTURE_TYPE_P)
917 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
918 s->mb_x, s->mb_y, ER_DC_ERROR);
921 if (s->pict_type == AV_PICTURE_TYPE_P)
922 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
923 s->mb_x - 1, s->mb_y, ER_DC_END);
931 * @return <0 if an error occurred
933 static inline int mpeg4_decode_block(MpegEncContext *s, int16_t *block,
934 int n, int coded, int intra, int rvlc)
936 int level, i, last, run, qmul, qadd;
937 int av_uninit(dc_pred_dir);
940 const uint8_t *scan_table;
942 // Note intra & rvlc should be optimized away if this is inlined
945 if (s->use_intra_dc_vlc) {
947 if (s->partitioned_frame) {
948 level = s->dc_val[0][s->block_index[n]];
950 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
952 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
953 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
955 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
963 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
969 rl = &ff_rvlc_rl_intra;
970 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
972 rl = &ff_mpeg4_rl_intra;
973 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
976 if (dc_pred_dir == 0)
977 scan_table = s->intra_v_scantable.permutated; /* left */
979 scan_table = s->intra_h_scantable.permutated; /* top */
981 scan_table = s->intra_scantable.permutated;
988 s->block_last_index[n] = i;
992 rl = &ff_rvlc_rl_inter;
994 rl = &ff_h263_rl_inter;
996 scan_table = s->intra_scantable.permutated;
1002 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1004 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1006 qmul = s->qscale << 1;
1007 qadd = (s->qscale - 1) | 1;
1009 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1011 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1015 OPEN_READER(re, &s->gb);
1017 UPDATE_CACHE(re, &s->gb);
1018 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1022 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1023 av_log(s->avctx, AV_LOG_ERROR,
1024 "1. marker bit missing in rvlc esc\n");
1027 SKIP_CACHE(re, &s->gb, 1);
1029 last = SHOW_UBITS(re, &s->gb, 1);
1030 SKIP_CACHE(re, &s->gb, 1);
1031 run = SHOW_UBITS(re, &s->gb, 6);
1032 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1033 UPDATE_CACHE(re, &s->gb);
1035 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1036 av_log(s->avctx, AV_LOG_ERROR,
1037 "2. marker bit missing in rvlc esc\n");
1040 SKIP_CACHE(re, &s->gb, 1);
1042 level = SHOW_UBITS(re, &s->gb, 11);
1043 SKIP_CACHE(re, &s->gb, 11);
1045 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1046 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1049 SKIP_CACHE(re, &s->gb, 5);
1051 level = level * qmul + qadd;
1052 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1053 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1060 cache = GET_CACHE(re, &s->gb);
1063 cache ^= 0xC0000000;
1065 if (cache & 0x80000000) {
1066 if (cache & 0x40000000) {
1068 SKIP_CACHE(re, &s->gb, 2);
1069 last = SHOW_UBITS(re, &s->gb, 1);
1070 SKIP_CACHE(re, &s->gb, 1);
1071 run = SHOW_UBITS(re, &s->gb, 6);
1072 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1073 UPDATE_CACHE(re, &s->gb);
1076 level = SHOW_SBITS(re, &s->gb, 12);
1077 LAST_SKIP_BITS(re, &s->gb, 12);
1079 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1080 av_log(s->avctx, AV_LOG_ERROR,
1081 "1. marker bit missing in 3. esc\n");
1084 SKIP_CACHE(re, &s->gb, 1);
1086 level = SHOW_SBITS(re, &s->gb, 12);
1087 SKIP_CACHE(re, &s->gb, 12);
1089 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1090 av_log(s->avctx, AV_LOG_ERROR,
1091 "2. marker bit missing in 3. esc\n");
1095 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1099 if (s->error_recognition >= FF_ER_COMPLIANT) {
1100 const int abs_level= FFABS(level);
1101 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1102 const int run1= run - rl->max_run[last][abs_level] - 1;
1103 if (abs_level <= rl->max_level[last][run]) {
1104 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1107 if (s->error_recognition > FF_ER_COMPLIANT) {
1108 if (abs_level <= rl->max_level[last][run]*2) {
1109 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1112 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1113 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1121 level = level * qmul + qadd;
1123 level = level * qmul - qadd;
1125 if ((unsigned)(level + 2048) > 4095) {
1126 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1127 if (level > 2560 || level < -2560) {
1128 av_log(s->avctx, AV_LOG_ERROR,
1129 "|level| overflow in 3. esc, qp=%d\n",
1134 level = level < 0 ? -2048 : 2047;
1142 SKIP_BITS(re, &s->gb, 2);
1143 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1144 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1145 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1146 LAST_SKIP_BITS(re, &s->gb, 1);
1150 SKIP_BITS(re, &s->gb, 1);
1151 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1153 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1154 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1155 LAST_SKIP_BITS(re, &s->gb, 1);
1160 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1161 LAST_SKIP_BITS(re, &s->gb, 1);
1166 av_log(s->avctx, AV_LOG_ERROR,
1167 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1171 block[scan_table[i]] = level;
1175 block[scan_table[i]] = level;
1177 CLOSE_READER(re, &s->gb);
1182 if (!s->use_intra_dc_vlc) {
1183 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1185 i -= i >> 31; // if (i == -1) i = 0;
1188 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1190 i = 63; // FIXME not optimal
1192 s->block_last_index[n] = i;
1197 * decode partition C of one MB.
1198 * @return <0 if an error occurred
1200 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1202 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1204 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1206 mb_type = s->current_picture.mb_type[xy];
1207 cbp = s->cbp_table[xy];
1209 s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
1211 if (s->current_picture.qscale_table[xy] != s->qscale)
1212 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1214 if (s->pict_type == AV_PICTURE_TYPE_P ||
1215 s->pict_type == AV_PICTURE_TYPE_S) {
1217 for (i = 0; i < 4; i++) {
1218 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1219 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1221 s->mb_intra = IS_INTRA(mb_type);
1223 if (IS_SKIP(mb_type)) {
1225 for (i = 0; i < 6; i++)
1226 s->block_last_index[i] = -1;
1227 s->mv_dir = MV_DIR_FORWARD;
1228 s->mv_type = MV_TYPE_16X16;
1229 if (s->pict_type == AV_PICTURE_TYPE_S
1230 && ctx->vol_sprite_usage == GMC_SPRITE) {
1237 } else if (s->mb_intra) {
1238 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1239 } else if (!s->mb_intra) {
1240 // s->mcsel = 0; // FIXME do we need to init that?
1242 s->mv_dir = MV_DIR_FORWARD;
1243 if (IS_8X8(mb_type)) {
1244 s->mv_type = MV_TYPE_8X8;
1246 s->mv_type = MV_TYPE_16X16;
1249 } else { /* I-Frame */
1251 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1254 if (!IS_SKIP(mb_type)) {
1256 s->dsp.clear_blocks(s->block[0]);
1257 /* decode each block */
1258 for (i = 0; i < 6; i++) {
1259 if (mpeg4_decode_block(s, block[i], i, cbp & 32, s->mb_intra, s->rvlc) < 0) {
1260 av_log(s->avctx, AV_LOG_ERROR,
1261 "texture corrupted at %d %d %d\n",
1262 s->mb_x, s->mb_y, s->mb_intra);
1269 /* per-MB end of slice check */
1270 if (--s->mb_num_left <= 0) {
1271 if (mpeg4_is_resync(s))
1276 if (mpeg4_is_resync(s)) {
1277 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1278 if (s->cbp_table[xy + delta])
1285 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1287 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1288 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1290 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1291 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1293 av_assert2(s->h263_pred);
1295 if (s->pict_type == AV_PICTURE_TYPE_P ||
1296 s->pict_type == AV_PICTURE_TYPE_S) {
1298 if (get_bits1(&s->gb)) {
1301 for (i = 0; i < 6; i++)
1302 s->block_last_index[i] = -1;
1303 s->mv_dir = MV_DIR_FORWARD;
1304 s->mv_type = MV_TYPE_16X16;
1305 if (s->pict_type == AV_PICTURE_TYPE_S &&
1306 ctx->vol_sprite_usage == GMC_SPRITE) {
1307 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1312 s->mv[0][0][0] = get_amv(s, 0);
1313 s->mv[0][0][1] = get_amv(s, 1);
1316 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1326 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1328 av_log(s->avctx, AV_LOG_ERROR,
1329 "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1332 } while (cbpc == 20);
1334 s->dsp.clear_blocks(s->block[0]);
1336 s->mb_intra = ((cbpc & 4) != 0);
1340 if (s->pict_type == AV_PICTURE_TYPE_S &&
1341 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1342 s->mcsel = get_bits1(&s->gb);
1345 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1347 cbp = (cbpc & 3) | (cbpy << 2);
1349 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1350 if ((!s->progressive_sequence) &&
1351 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1352 s->interlaced_dct = get_bits1(&s->gb);
1354 s->mv_dir = MV_DIR_FORWARD;
1355 if ((cbpc & 16) == 0) {
1357 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1360 /* 16x16 global motion prediction */
1361 s->mv_type = MV_TYPE_16X16;
1364 s->mv[0][0][0] = mx;
1365 s->mv[0][0][1] = my;
1366 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1367 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1370 /* 16x8 field motion prediction */
1371 s->mv_type = MV_TYPE_FIELD;
1373 s->field_select[0][0] = get_bits1(&s->gb);
1374 s->field_select[0][1] = get_bits1(&s->gb);
1376 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1378 for (i = 0; i < 2; i++) {
1379 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1383 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1387 s->mv[0][i][0] = mx;
1388 s->mv[0][i][1] = my;
1391 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1392 /* 16x16 motion prediction */
1393 s->mv_type = MV_TYPE_16X16;
1394 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1395 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1400 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1404 s->mv[0][0][0] = mx;
1405 s->mv[0][0][1] = my;
1408 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1409 s->mv_type = MV_TYPE_8X8;
1410 for (i = 0; i < 4; i++) {
1411 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1412 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1416 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1419 s->mv[0][i][0] = mx;
1420 s->mv[0][i][1] = my;
1425 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1426 int modb1; // first bit of modb
1427 int modb2; // second bit of modb
1430 s->mb_intra = 0; // B-frames never contain intra blocks
1431 s->mcsel = 0; // ... true gmc blocks
1434 for (i = 0; i < 2; i++) {
1435 s->last_mv[i][0][0] =
1436 s->last_mv[i][0][1] =
1437 s->last_mv[i][1][0] =
1438 s->last_mv[i][1][1] = 0;
1441 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1444 /* if we skipped it in the future P Frame than skip it now too */
1445 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1447 if (s->mb_skipped) {
1449 for (i = 0; i < 6; i++)
1450 s->block_last_index[i] = -1;
1452 s->mv_dir = MV_DIR_FORWARD;
1453 s->mv_type = MV_TYPE_16X16;
1458 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1464 modb1 = get_bits1(&s->gb);
1466 // like MB_TYPE_B_DIRECT but no vectors coded
1467 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1470 modb2 = get_bits1(&s->gb);
1471 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1473 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1476 mb_type = mb_type_b_map[mb_type];
1480 s->dsp.clear_blocks(s->block[0]);
1481 cbp = get_bits(&s->gb, 6);
1484 if ((!IS_DIRECT(mb_type)) && cbp) {
1485 if (get_bits1(&s->gb))
1486 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1489 if (!s->progressive_sequence) {
1491 s->interlaced_dct = get_bits1(&s->gb);
1493 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1494 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1495 mb_type &= ~MB_TYPE_16x16;
1497 if (USES_LIST(mb_type, 0)) {
1498 s->field_select[0][0] = get_bits1(&s->gb);
1499 s->field_select[0][1] = get_bits1(&s->gb);
1501 if (USES_LIST(mb_type, 1)) {
1502 s->field_select[1][0] = get_bits1(&s->gb);
1503 s->field_select[1][1] = get_bits1(&s->gb);
1509 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1510 s->mv_type = MV_TYPE_16X16;
1512 if (USES_LIST(mb_type, 0)) {
1513 s->mv_dir = MV_DIR_FORWARD;
1515 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1516 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1517 s->last_mv[0][1][0] =
1518 s->last_mv[0][0][0] =
1519 s->mv[0][0][0] = mx;
1520 s->last_mv[0][1][1] =
1521 s->last_mv[0][0][1] =
1522 s->mv[0][0][1] = my;
1525 if (USES_LIST(mb_type, 1)) {
1526 s->mv_dir |= MV_DIR_BACKWARD;
1528 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1529 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1530 s->last_mv[1][1][0] =
1531 s->last_mv[1][0][0] =
1532 s->mv[1][0][0] = mx;
1533 s->last_mv[1][1][1] =
1534 s->last_mv[1][0][1] =
1535 s->mv[1][0][1] = my;
1537 } else if (!IS_DIRECT(mb_type)) {
1538 s->mv_type = MV_TYPE_FIELD;
1540 if (USES_LIST(mb_type, 0)) {
1541 s->mv_dir = MV_DIR_FORWARD;
1543 for (i = 0; i < 2; i++) {
1544 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1545 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1546 s->last_mv[0][i][0] =
1547 s->mv[0][i][0] = mx;
1548 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1552 if (USES_LIST(mb_type, 1)) {
1553 s->mv_dir |= MV_DIR_BACKWARD;
1555 for (i = 0; i < 2; i++) {
1556 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1557 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1558 s->last_mv[1][i][0] =
1559 s->mv[1][i][0] = mx;
1560 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1566 if (IS_DIRECT(mb_type)) {
1567 if (IS_SKIP(mb_type)) {
1571 mx = ff_h263_decode_motion(s, 0, 1);
1572 my = ff_h263_decode_motion(s, 0, 1);
1575 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1576 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1578 s->current_picture.mb_type[xy] = mb_type;
1579 } else { /* I-Frame */
1581 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1583 av_log(s->avctx, AV_LOG_ERROR,
1584 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1587 } while (cbpc == 8);
1593 s->ac_pred = get_bits1(&s->gb);
1595 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1597 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1599 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1601 av_log(s->avctx, AV_LOG_ERROR,
1602 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1605 cbp = (cbpc & 3) | (cbpy << 2);
1607 s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
1610 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1612 if (!s->progressive_sequence)
1613 s->interlaced_dct = get_bits1(&s->gb);
1615 s->dsp.clear_blocks(s->block[0]);
1616 /* decode each block */
1617 for (i = 0; i < 6; i++) {
1618 if (mpeg4_decode_block(s, block[i], i, cbp & 32, 1, 0) < 0)
1625 /* decode each block */
1626 for (i = 0; i < 6; i++) {
1627 if (mpeg4_decode_block(s, block[i], i, cbp & 32, 0, 0) < 0)
1633 /* per-MB end of slice check */
1634 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1635 int next = mpeg4_is_resync(s);
1637 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1639 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1642 if (s->pict_type == AV_PICTURE_TYPE_B) {
1643 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1644 ff_thread_await_progress(&s->next_picture_ptr->tf,
1645 (s->mb_x + delta >= s->mb_width)
1646 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1648 if (s->next_picture.mbskip_table[xy + delta])
1659 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1661 int hours, minutes, seconds;
1663 if (!show_bits(gb, 23)) {
1664 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1668 hours = get_bits(gb, 5);
1669 minutes = get_bits(gb, 6);
1671 seconds = get_bits(gb, 6);
1673 s->time_base = seconds + 60*(minutes + 60*hours);
1681 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1684 s->avctx->profile = get_bits(gb, 4);
1685 s->avctx->level = get_bits(gb, 4);
1687 // for Simple profile, level 0
1688 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1689 s->avctx->level = 0;
1695 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1697 MpegEncContext *s = &ctx->m;
1698 int width, height, vo_ver_id;
1701 skip_bits(gb, 1); /* random access */
1702 s->vo_type = get_bits(gb, 8);
1703 if (get_bits1(gb) != 0) { /* is_ol_id */
1704 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1705 skip_bits(gb, 3); /* vo_priority */
1709 s->aspect_ratio_info = get_bits(gb, 4);
1710 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1711 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1712 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1714 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1717 if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1718 int chroma_format = get_bits(gb, 2);
1719 if (chroma_format != CHROMA_420)
1720 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1722 s->low_delay = get_bits1(gb);
1723 if (get_bits1(gb)) { /* vbv parameters */
1724 get_bits(gb, 15); /* first_half_bitrate */
1725 skip_bits1(gb); /* marker */
1726 get_bits(gb, 15); /* latter_half_bitrate */
1727 skip_bits1(gb); /* marker */
1728 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1729 skip_bits1(gb); /* marker */
1730 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1731 get_bits(gb, 11); /* first_half_vbv_occupancy */
1732 skip_bits1(gb); /* marker */
1733 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1734 skip_bits1(gb); /* marker */
1737 /* is setting low delay flag only once the smartest thing to do?
1738 * low delay detection won't be overriden. */
1739 if (s->picture_number == 0)
1743 ctx->shape = get_bits(gb, 2); /* vol shape */
1744 if (ctx->shape != RECT_SHAPE)
1745 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1746 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1747 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1748 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1751 check_marker(gb, "before time_increment_resolution");
1753 s->avctx->time_base.den = get_bits(gb, 16);
1754 if (!s->avctx->time_base.den) {
1755 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1756 s->avctx->time_base.num = 0;
1760 ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1761 if (ctx->time_increment_bits < 1)
1762 ctx->time_increment_bits = 1;
1764 check_marker(gb, "before fixed_vop_rate");
1766 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1767 s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits);
1769 s->avctx->time_base.num = 1;
1773 if (ctx->shape != BIN_ONLY_SHAPE) {
1774 if (ctx->shape == RECT_SHAPE) {
1775 check_marker(gb, "before width");
1776 width = get_bits(gb, 13);
1777 check_marker(gb, "before height");
1778 height = get_bits(gb, 13);
1779 check_marker(gb, "after height");
1780 if (width && height && /* they should be non zero but who knows */
1781 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1782 if (s->width && s->height &&
1783 (s->width != width || s->height != height))
1784 s->context_reinit = 1;
1790 s->progressive_sequence =
1791 s->progressive_frame = get_bits1(gb) ^ 1;
1792 s->interlaced_dct = 0;
1793 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1794 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1795 "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1797 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1799 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1801 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1802 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1803 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1804 ctx->vol_sprite_usage == GMC_SPRITE) {
1805 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1806 skip_bits(gb, 13); // sprite_width
1807 skip_bits1(gb); /* marker */
1808 skip_bits(gb, 13); // sprite_height
1809 skip_bits1(gb); /* marker */
1810 skip_bits(gb, 13); // sprite_left
1811 skip_bits1(gb); /* marker */
1812 skip_bits(gb, 13); // sprite_top
1813 skip_bits1(gb); /* marker */
1815 s->num_sprite_warping_points = get_bits(gb, 6);
1816 if (s->num_sprite_warping_points > 3) {
1817 av_log(s->avctx, AV_LOG_ERROR,
1818 "%d sprite_warping_points\n",
1819 s->num_sprite_warping_points);
1820 s->num_sprite_warping_points = 0;
1823 s->sprite_warping_accuracy = get_bits(gb, 2);
1824 s->sprite_brightness_change = get_bits1(gb);
1825 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1826 s->low_latency_sprite = get_bits1(gb);
1828 // FIXME sadct disable bit if verid!=1 && shape not rect
1830 if (get_bits1(gb) == 1) { /* not_8_bit */
1831 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1832 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1833 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1834 if (s->quant_precision != 5)
1835 av_log(s->avctx, AV_LOG_ERROR,
1836 "quant precision %d\n", s->quant_precision);
1837 if (s->quant_precision<3 || s->quant_precision>9) {
1838 s->quant_precision = 5;
1841 s->quant_precision = 5;
1844 // FIXME a bunch of grayscale shape things
1846 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1849 /* load default matrixes */
1850 for (i = 0; i < 64; i++) {
1851 int j = s->dsp.idct_permutation[i];
1852 v = ff_mpeg4_default_intra_matrix[i];
1853 s->intra_matrix[j] = v;
1854 s->chroma_intra_matrix[j] = v;
1856 v = ff_mpeg4_default_non_intra_matrix[i];
1857 s->inter_matrix[j] = v;
1858 s->chroma_inter_matrix[j] = v;
1861 /* load custom intra matrix */
1862 if (get_bits1(gb)) {
1864 for (i = 0; i < 64; i++) {
1866 v = get_bits(gb, 8);
1871 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1872 s->intra_matrix[j] = last;
1873 s->chroma_intra_matrix[j] = last;
1876 /* replicate last value */
1877 for (; i < 64; i++) {
1878 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1879 s->intra_matrix[j] = last;
1880 s->chroma_intra_matrix[j] = last;
1884 /* load custom non intra matrix */
1885 if (get_bits1(gb)) {
1887 for (i = 0; i < 64; i++) {
1889 v = get_bits(gb, 8);
1894 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1895 s->inter_matrix[j] = v;
1896 s->chroma_inter_matrix[j] = v;
1899 /* replicate last value */
1900 for (; i < 64; i++) {
1901 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1902 s->inter_matrix[j] = last;
1903 s->chroma_inter_matrix[j] = last;
1907 // FIXME a bunch of grayscale shape things
1911 s->quarter_sample = get_bits1(gb);
1913 s->quarter_sample = 0;
1915 if (!get_bits1(gb)) {
1916 int pos = get_bits_count(gb);
1917 int estimation_method = get_bits(gb, 2);
1918 if (estimation_method < 2) {
1919 if (!get_bits1(gb)) {
1920 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1921 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1922 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1923 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1924 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1925 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1927 if (!get_bits1(gb)) {
1928 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1929 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1930 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1931 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1933 if (!check_marker(gb, "in complexity estimation part 1")) {
1934 skip_bits_long(gb, pos - get_bits_count(gb));
1937 if (!get_bits1(gb)) {
1938 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1939 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1940 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1941 s->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1943 if (!get_bits1(gb)) {
1944 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1945 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1946 s->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1947 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1948 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1949 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1951 if (!check_marker(gb, "in complexity estimation part 2")) {
1952 skip_bits_long(gb, pos - get_bits_count(gb));
1955 if (estimation_method == 1) {
1956 s->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1957 s->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1960 av_log(s->avctx, AV_LOG_ERROR,
1961 "Invalid Complexity estimation method %d\n",
1966 s->cplx_estimation_trash_i =
1967 s->cplx_estimation_trash_p =
1968 s->cplx_estimation_trash_b = 0;
1971 s->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1973 s->data_partitioning = get_bits1(gb);
1974 if (s->data_partitioning)
1975 s->rvlc = get_bits1(gb);
1977 if (vo_ver_id != 1) {
1978 s->new_pred = get_bits1(gb);
1980 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1981 skip_bits(gb, 2); /* requested upstream message type */
1982 skip_bits1(gb); /* newpred segment type */
1984 s->reduced_res_vop = get_bits1(gb);
1985 if (s->reduced_res_vop)
1986 av_log(s->avctx, AV_LOG_ERROR,
1987 "reduced resolution VOP not supported\n");
1990 s->reduced_res_vop = 0;
1993 s->scalability = get_bits1(gb);
1995 if (s->scalability) {
1996 GetBitContext bak = *gb;
1997 int h_sampling_factor_n;
1998 int h_sampling_factor_m;
1999 int v_sampling_factor_n;
2000 int v_sampling_factor_m;
2002 s->hierachy_type = get_bits1(gb);
2003 skip_bits(gb, 4); /* ref_layer_id */
2004 skip_bits1(gb); /* ref_layer_sampling_dir */
2005 h_sampling_factor_n = get_bits(gb, 5);
2006 h_sampling_factor_m = get_bits(gb, 5);
2007 v_sampling_factor_n = get_bits(gb, 5);
2008 v_sampling_factor_m = get_bits(gb, 5);
2009 s->enhancement_type = get_bits1(gb);
2011 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2012 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2013 /* illegal scalability header (VERY broken encoder),
2014 * trying to workaround */
2018 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2020 // bin shape stuff FIXME
2024 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2025 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2026 s->avctx->time_base.num, s->avctx->time_base.den,
2027 ctx->time_increment_bits,
2029 s->progressive_sequence,
2030 s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2031 s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
2039 * Decode the user data stuff in the header.
2040 * Also initializes divx/xvid/lavc_version/build.
2042 static int decode_user_data(MpegEncContext *s, GetBitContext *gb)
2047 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2050 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2051 if (show_bits(gb, 23) == 0)
2053 buf[i] = get_bits(gb, 8);
2057 /* divx detection */
2058 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2060 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2062 s->divx_version = ver;
2063 s->divx_build = build;
2064 s->divx_packed = e == 3 && last == 'p';
2065 if (s->divx_packed && !s->showed_packed_warning) {
2066 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2067 "wasteful way to store B-frames ('packed B-frames'). "
2068 "Consider using a tool like VirtualDub or avidemux to fix it.\n");
2069 s->showed_packed_warning = 1;
2073 /* libavcodec detection */
2074 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2076 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2078 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2080 build = (ver << 16) + (ver2 << 8) + ver3;
2083 if (strcmp(buf, "ffmpeg") == 0)
2084 s->lavc_build = 4600;
2087 s->lavc_build = build;
2089 /* Xvid detection */
2090 e = sscanf(buf, "XviD%d", &build);
2092 s->xvid_build = build;
2097 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2099 MpegEncContext *s = &ctx->m;
2100 int time_incr, time_increment;
2103 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2104 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2105 s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2106 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2110 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2111 if (s->partitioned_frame)
2112 s->decode_mb = mpeg4_decode_partitioned_mb;
2114 s->decode_mb = mpeg4_decode_mb;
2117 while (get_bits1(gb) != 0)
2120 check_marker(gb, "before time_increment");
2122 if (ctx->time_increment_bits == 0 ||
2123 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2124 av_log(s->avctx, AV_LOG_ERROR,
2125 "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2127 for (ctx->time_increment_bits = 1;
2128 ctx->time_increment_bits < 16;
2129 ctx->time_increment_bits++) {
2130 if (s->pict_type == AV_PICTURE_TYPE_P ||
2131 (s->pict_type == AV_PICTURE_TYPE_S &&
2132 ctx->vol_sprite_usage == GMC_SPRITE)) {
2133 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2135 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2139 av_log(s->avctx, AV_LOG_ERROR,
2140 "my guess is %d bits ;)\n", ctx->time_increment_bits);
2141 if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<ctx->time_increment_bits) {
2142 s->avctx->time_base.den = 1<<ctx->time_increment_bits;
2147 time_increment = get_bits1(gb); // FIXME investigate further
2149 time_increment = get_bits(gb, ctx->time_increment_bits);
2151 if (s->pict_type != AV_PICTURE_TYPE_B) {
2152 s->last_time_base = s->time_base;
2153 s->time_base += time_incr;
2154 s->time = s->time_base * s->avctx->time_base.den + time_increment;
2155 if (s->workaround_bugs & FF_BUG_UMP4) {
2156 if (s->time < s->last_non_b_time) {
2157 /* header is not mpeg-4-compatible, broken encoder,
2158 * trying to workaround */
2160 s->time += s->avctx->time_base.den;
2163 s->pp_time = s->time - s->last_non_b_time;
2164 s->last_non_b_time = s->time;
2166 s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2167 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2168 if (s->pp_time <= s->pb_time ||
2169 s->pp_time <= s->pp_time - s->pb_time ||
2171 /* messed up order, maybe after seeking? skipping current b-frame */
2172 return FRAME_SKIPPED;
2174 ff_mpeg4_init_direct_mv(s);
2176 if (s->t_frame == 0)
2177 s->t_frame = s->pb_time;
2178 if (s->t_frame == 0)
2179 s->t_frame = 1; // 1/0 protection
2180 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, s->t_frame) -
2181 ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame)) * 2;
2182 s->pb_field_time = (ROUNDED_DIV(s->time, s->t_frame) -
2183 ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame)) * 2;
2184 if (!s->progressive_sequence) {
2185 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2186 return FRAME_SKIPPED;
2190 if (s->avctx->time_base.num)
2191 pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
2193 pts = AV_NOPTS_VALUE;
2194 if (s->avctx->debug&FF_DEBUG_PTS)
2195 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2198 check_marker(gb, "before vop_coded");
2201 if (get_bits1(gb) != 1) {
2202 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2203 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2204 return FRAME_SKIPPED;
2207 decode_new_pred(ctx, gb);
2209 if (ctx->shape != BIN_ONLY_SHAPE &&
2210 (s->pict_type == AV_PICTURE_TYPE_P ||
2211 (s->pict_type == AV_PICTURE_TYPE_S &&
2212 ctx->vol_sprite_usage == GMC_SPRITE))) {
2213 /* rounding type for motion estimation */
2214 s->no_rounding = get_bits1(gb);
2218 // FIXME reduced res stuff
2220 if (ctx->shape != RECT_SHAPE) {
2221 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2222 skip_bits(gb, 13); /* width */
2223 skip_bits1(gb); /* marker */
2224 skip_bits(gb, 13); /* height */
2225 skip_bits1(gb); /* marker */
2226 skip_bits(gb, 13); /* hor_spat_ref */
2227 skip_bits1(gb); /* marker */
2228 skip_bits(gb, 13); /* ver_spat_ref */
2230 skip_bits1(gb); /* change_CR_disable */
2232 if (get_bits1(gb) != 0)
2233 skip_bits(gb, 8); /* constant_alpha_value */
2236 // FIXME complexity estimation stuff
2238 if (ctx->shape != BIN_ONLY_SHAPE) {
2239 skip_bits_long(gb, s->cplx_estimation_trash_i);
2240 if (s->pict_type != AV_PICTURE_TYPE_I)
2241 skip_bits_long(gb, s->cplx_estimation_trash_p);
2242 if (s->pict_type == AV_PICTURE_TYPE_B)
2243 skip_bits_long(gb, s->cplx_estimation_trash_b);
2245 if (get_bits_left(gb) < 3) {
2246 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2249 s->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2250 if (!s->progressive_sequence) {
2251 s->top_field_first = get_bits1(gb);
2252 s->alternate_scan = get_bits1(gb);
2254 s->alternate_scan = 0;
2257 if (s->alternate_scan) {
2258 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2259 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2260 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2261 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2263 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2264 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2265 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2266 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2269 if (s->pict_type == AV_PICTURE_TYPE_S &&
2270 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2271 ctx->vol_sprite_usage == GMC_SPRITE)) {
2272 if (mpeg4_decode_sprite_trajectory(s, gb) < 0)
2273 return AVERROR_INVALIDDATA;
2274 if (s->sprite_brightness_change)
2275 av_log(s->avctx, AV_LOG_ERROR,
2276 "sprite_brightness_change not supported\n");
2277 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2278 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2281 if (ctx->shape != BIN_ONLY_SHAPE) {
2282 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2283 if (s->qscale == 0) {
2284 av_log(s->avctx, AV_LOG_ERROR,
2285 "Error, header damaged or not MPEG4 header (qscale=0)\n");
2286 return -1; // makes no sense to continue, as there is nothing left from the image then
2289 if (s->pict_type != AV_PICTURE_TYPE_I) {
2290 s->f_code = get_bits(gb, 3); /* fcode_for */
2291 if (s->f_code == 0) {
2292 av_log(s->avctx, AV_LOG_ERROR,
2293 "Error, header damaged or not MPEG4 header (f_code=0)\n");
2295 return -1; // makes no sense to continue, as there is nothing left from the image then
2300 if (s->pict_type == AV_PICTURE_TYPE_B) {
2301 s->b_code = get_bits(gb, 3);
2302 if (s->b_code == 0) {
2303 av_log(s->avctx, AV_LOG_ERROR,
2304 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2306 return -1; // makes no sense to continue, as the MV decoding will break very quickly
2311 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2312 av_log(s->avctx, AV_LOG_DEBUG,
2313 "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",
2314 s->qscale, s->f_code, s->b_code,
2315 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")),
2316 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2317 s->top_field_first, s->quarter_sample ? "q" : "h",
2318 s->data_partitioning, s->resync_marker,
2319 s->num_sprite_warping_points, s->sprite_warping_accuracy,
2320 1 - s->no_rounding, s->vo_type,
2321 s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
2322 s->cplx_estimation_trash_i, s->cplx_estimation_trash_p,
2323 s->cplx_estimation_trash_b,
2329 if (!s->scalability) {
2330 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2331 skip_bits1(gb); // vop shape coding type
2333 if (s->enhancement_type) {
2334 int load_backward_shape = get_bits1(gb);
2335 if (load_backward_shape)
2336 av_log(s->avctx, AV_LOG_ERROR,
2337 "load backward shape isn't supported\n");
2339 skip_bits(gb, 2); // ref_select_code
2342 /* detect buggy encoders which don't set the low_delay flag
2343 * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2344 * easily (although it's buggy too) */
2345 if (s->vo_type == 0 && s->vol_control_parameters == 0 &&
2346 s->divx_version == -1 && s->picture_number == 0) {
2347 av_log(s->avctx, AV_LOG_WARNING,
2348 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2352 s->picture_number++; // better than pic number==0 always ;)
2354 // FIXME add short header support
2355 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2356 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2358 if (s->workaround_bugs & FF_BUG_EDGE) {
2359 s->h_edge_pos = s->width;
2360 s->v_edge_pos = s->height;
2366 * Decode mpeg4 headers.
2367 * @return <0 if no VOP found (or a damaged one)
2368 * FRAME_SKIPPED if a not coded VOP is found
2369 * 0 if a VOP is found
2371 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2373 MpegEncContext *s = &ctx->m;
2374 unsigned startcode, v;
2376 /* search next start code */
2379 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2381 if (get_bits(gb, 8) == 0xF0)
2387 if (get_bits_count(gb) >= gb->size_in_bits) {
2388 if (gb->size_in_bits == 8 &&
2389 (s->divx_version >= 0 || s->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2390 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2391 return FRAME_SKIPPED; // divx bug
2393 return -1; // end of stream
2396 /* use the bits after the test */
2397 v = get_bits(gb, 8);
2398 startcode = ((startcode << 8) | v) & 0xffffffff;
2400 if ((startcode & 0xFFFFFF00) != 0x100)
2401 continue; // no startcode
2403 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2404 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2405 if (startcode <= 0x11F)
2406 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2407 else if (startcode <= 0x12F)
2408 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2409 else if (startcode <= 0x13F)
2410 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2411 else if (startcode <= 0x15F)
2412 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2413 else if (startcode <= 0x1AF)
2414 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2415 else if (startcode == 0x1B0)
2416 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2417 else if (startcode == 0x1B1)
2418 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2419 else if (startcode == 0x1B2)
2420 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2421 else if (startcode == 0x1B3)
2422 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2423 else if (startcode == 0x1B4)
2424 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2425 else if (startcode == 0x1B5)
2426 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2427 else if (startcode == 0x1B6)
2428 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2429 else if (startcode == 0x1B7)
2430 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2431 else if (startcode == 0x1B8)
2432 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2433 else if (startcode == 0x1B9)
2434 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2435 else if (startcode == 0x1BA)
2436 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2437 else if (startcode == 0x1BB)
2438 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2439 else if (startcode == 0x1BC)
2440 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2441 else if (startcode == 0x1BD)
2442 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2443 else if (startcode == 0x1BE)
2444 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2445 else if (startcode == 0x1BF)
2446 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2447 else if (startcode == 0x1C0)
2448 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2449 else if (startcode == 0x1C1)
2450 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2451 else if (startcode == 0x1C2)
2452 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2453 else if (startcode == 0x1C3)
2454 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2455 else if (startcode <= 0x1C5)
2456 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2457 else if (startcode <= 0x1FF)
2458 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2459 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2462 if (startcode >= 0x120 && startcode <= 0x12F) {
2463 if (decode_vol_header(ctx, gb) < 0)
2465 } else if (startcode == USER_DATA_STARTCODE) {
2466 decode_user_data(s, gb);
2467 } else if (startcode == GOP_STARTCODE) {
2468 mpeg4_decode_gop_header(s, gb);
2469 } else if (startcode == VOS_STARTCODE) {
2470 mpeg4_decode_profile_level(s, gb);
2471 } else if (startcode == VOP_STARTCODE) {
2480 if (s->flags & CODEC_FLAG_LOW_DELAY)
2482 s->avctx->has_b_frames = !s->low_delay;
2484 return decode_vop_header(ctx, gb);
2487 av_cold void ff_mpeg4videodec_static_init(void) {
2488 static int done = 0;
2491 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2492 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2493 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2494 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2495 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2496 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2497 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2498 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2499 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2500 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2501 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2502 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2503 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2504 &ff_sprite_trajectory_tab[0][1], 4, 2,
2505 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2506 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2507 &ff_mb_type_b_tab[0][1], 2, 1,
2508 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2513 static int mpeg4_update_thread_context(AVCodecContext *dst,
2514 const AVCodecContext *src)
2516 Mpeg4DecContext *s = dst->priv_data;
2517 const Mpeg4DecContext *s1 = src->priv_data;
2519 int ret = ff_mpeg_update_thread_context(dst, src);
2524 s->shape = s1->shape;
2525 s->time_increment_bits = s1->time_increment_bits;
2526 s->vol_sprite_usage = s1->vol_sprite_usage;
2531 static av_cold int decode_init(AVCodecContext *avctx)
2533 Mpeg4DecContext *ctx = avctx->priv_data;
2534 MpegEncContext *s = &ctx->m;
2542 if ((ret = ff_h263_decode_init(avctx)) < 0)
2545 ff_mpeg4videodec_static_init();
2548 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2549 s->decode_mb = mpeg4_decode_mb;
2550 ctx->time_increment_bits = 4; /* default value for broken headers */
2552 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2553 avctx->internal->allocate_progress = 1;
2558 static const AVProfile mpeg4_video_profiles[] = {
2559 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2560 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2561 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2562 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2563 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2564 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2565 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2566 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2567 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2568 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2569 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2570 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2571 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2572 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2573 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2574 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2575 { FF_PROFILE_UNKNOWN },
2578 static const AVOption mpeg4_options[] = {
2579 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2580 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2584 static const AVClass mpeg4_class = {
2585 "MPEG4 Video Decoder",
2586 av_default_item_name,
2588 LIBAVUTIL_VERSION_INT,
2591 static const AVClass mpeg4_vdpau_class = {
2592 "MPEG4 Video VDPAU Decoder",
2593 av_default_item_name,
2595 LIBAVUTIL_VERSION_INT,
2598 AVCodec ff_mpeg4_decoder = {
2600 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2601 .type = AVMEDIA_TYPE_VIDEO,
2602 .id = AV_CODEC_ID_MPEG4,
2603 .priv_data_size = sizeof(Mpeg4DecContext),
2604 .init = decode_init,
2605 .close = ff_h263_decode_end,
2606 .decode = ff_h263_decode_frame,
2607 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2608 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2609 CODEC_CAP_FRAME_THREADS,
2610 .flush = ff_mpeg_flush,
2612 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2613 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2614 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2615 .priv_class = &mpeg4_class,
2619 #if CONFIG_MPEG4_VDPAU_DECODER
2620 AVCodec ff_mpeg4_vdpau_decoder = {
2621 .name = "mpeg4_vdpau",
2622 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2623 .type = AVMEDIA_TYPE_VIDEO,
2624 .id = AV_CODEC_ID_MPEG4,
2625 .priv_data_size = sizeof(MpegEncContext),
2626 .init = decode_init,
2627 .close = ff_h263_decode_end,
2628 .decode = ff_h263_decode_frame,
2629 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2630 CODEC_CAP_HWACCEL_VDPAU,
2631 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2633 .priv_class = &mpeg4_vdpau_class,