3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "error_resilience.h"
25 #include "mpegvideo.h"
26 #include "mpeg4video.h"
30 /* The defines below define the number of bits that are read at once for
31 * reading vlc values. Changing these may improve speed and data cache needs
32 * be aware though that decreasing them may need the number of stages that is
33 * passed to get_vlc* to be increased. */
34 #define SPRITE_TRAJ_VLC_BITS 6
36 #define MB_TYPE_B_VLC_BITS 4
38 static VLC dc_lum, dc_chrom;
39 static VLC sprite_trajectory;
40 static VLC mb_type_b_vlc;
42 static const int mb_type_b_map[4] = {
43 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
44 MB_TYPE_L0L1 | MB_TYPE_16x16,
45 MB_TYPE_L1 | MB_TYPE_16x16,
46 MB_TYPE_L0 | MB_TYPE_16x16,
51 * @param n block index (0-3 are luma, 4-5 are chroma)
52 * @param dir the ac prediction direction
54 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
57 int16_t *ac_val, *ac_val1;
58 int8_t *const qscale_table = s->current_picture.qscale_table;
61 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
65 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
69 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
72 for (i = 1; i < 8; i++)
73 block[s->dsp.idct_permutation[i << 3]] += ac_val[i];
75 /* different qscale, we must rescale */
76 for (i = 1; i < 8; i++)
77 block[s->dsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
80 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
82 ac_val -= 16 * s->block_wrap[n];
84 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
87 for (i = 1; i < 8; i++)
88 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
90 /* different qscale, we must rescale */
91 for (i = 1; i < 8; i++)
92 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
97 for (i = 1; i < 8; i++)
98 ac_val1[i] = block[s->dsp.idct_permutation[i << 3]];
101 for (i = 1; i < 8; i++)
102 ac_val1[8 + i] = block[s->dsp.idct_permutation[i]];
106 * check if the next stuff is a resync marker or the end.
109 static inline int mpeg4_is_resync(MpegEncContext *s)
111 int bits_count = get_bits_count(&s->gb);
112 int v = show_bits(&s->gb, 16);
114 if (s->workaround_bugs & FF_BUG_NO_PADDING)
118 if (s->pict_type == AV_PICTURE_TYPE_B ||
119 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
121 skip_bits(&s->gb, 8 + s->pict_type);
122 bits_count += 8 + s->pict_type;
123 v = show_bits(&s->gb, 16);
126 if (bits_count + 8 >= s->gb.size_in_bits) {
128 v |= 0x7F >> (7 - (bits_count & 7));
133 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
135 GetBitContext gb = s->gb;
137 skip_bits(&s->gb, 1);
138 align_get_bits(&s->gb);
140 for (len = 0; len < 32; len++)
141 if (get_bits1(&s->gb))
146 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
153 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
155 MpegEncContext *s = &ctx->m;
156 int a = 2 << s->sprite_warping_accuracy;
157 int rho = 3 - s->sprite_warping_accuracy;
163 int min_ab, i, w2, h2, w3, h3;
164 int sprite_ref[4][2];
165 int virtual_ref[2][2];
167 // only true for rectangle shapes
168 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
169 { 0, s->height }, { s->width, s->height } };
170 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
172 if (w <= 0 || h <= 0)
173 return AVERROR_INVALIDDATA;
175 for (i = 0; i < s->num_sprite_warping_points; i++) {
179 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
181 x = get_xbits(gb, length);
183 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
184 skip_bits1(gb); /* marker bit */
186 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
188 y = get_xbits(gb, length);
190 skip_bits1(gb); /* marker bit */
191 s->sprite_traj[i][0] = d[i][0] = x;
192 s->sprite_traj[i][1] = d[i][1] = y;
195 s->sprite_traj[i][0] = s->sprite_traj[i][1] = 0;
197 while ((1 << alpha) < w)
199 while ((1 << beta) < h)
200 beta++; /* typo in the mpeg4 std for the definition of w' and h' */
204 // Note, the 4th point isn't used for GMC
205 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
206 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
207 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
208 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
209 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
210 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
211 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
213 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
214 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
215 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
216 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
217 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
218 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
220 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
221 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
223 /* this is mostly identical to the mpeg4 std (and is totally unreadable
224 * because of that...). Perhaps it should be reordered to be more readable.
225 * The idea behind this virtual_ref mess is to be able to use shifts later
226 * per pixel instead of divides so the distance between points is converted
227 * from w&h based to w2&h2 based which are of the 2^x form. */
228 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
229 ROUNDED_DIV(((w - w2) *
230 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
231 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
232 virtual_ref[0][1] = 16 * vop_ref[0][1] +
233 ROUNDED_DIV(((w - w2) *
234 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
235 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
236 virtual_ref[1][0] = 16 * vop_ref[0][0] +
237 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
238 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
239 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
240 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
241 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
243 switch (s->num_sprite_warping_points) {
245 s->sprite_offset[0][0] =
246 s->sprite_offset[0][1] =
247 s->sprite_offset[1][0] =
248 s->sprite_offset[1][1] = 0;
249 s->sprite_delta[0][0] = a;
250 s->sprite_delta[0][1] =
251 s->sprite_delta[1][0] = 0;
252 s->sprite_delta[1][1] = a;
254 s->sprite_shift[1] = 0;
257 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
258 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
259 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
260 a * (vop_ref[0][0] / 2);
261 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
262 a * (vop_ref[0][1] / 2);
263 s->sprite_delta[0][0] = a;
264 s->sprite_delta[0][1] =
265 s->sprite_delta[1][0] = 0;
266 s->sprite_delta[1][1] = a;
268 s->sprite_shift[1] = 0;
271 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
272 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
274 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
275 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
276 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
277 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
279 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
280 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
281 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
282 (-2 * vop_ref[0][0] + 1) +
283 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
284 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
285 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
286 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
287 (-2 * vop_ref[0][0] + 1) +
288 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
290 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
291 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
292 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
293 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
294 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
296 s->sprite_shift[0] = alpha + rho;
297 s->sprite_shift[1] = alpha + rho + 2;
300 min_ab = FFMIN(alpha, beta);
303 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
304 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
305 h3 * (-vop_ref[0][0]) +
306 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
307 w3 * (-vop_ref[0][1]) +
308 (1 << (alpha + beta + rho - min_ab - 1));
309 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
310 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
311 h3 * (-vop_ref[0][0]) +
312 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
313 w3 * (-vop_ref[0][1]) +
314 (1 << (alpha + beta + rho - min_ab - 1));
315 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
316 h3 * (-2 * vop_ref[0][0] + 1) +
317 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
318 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
319 r * sprite_ref[0][0] - 16 * w2 * h3 +
320 (1 << (alpha + beta + rho - min_ab + 1));
321 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
322 h3 * (-2 * vop_ref[0][0] + 1) +
323 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
324 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
325 r * sprite_ref[0][1] - 16 * w2 * h3 +
326 (1 << (alpha + beta + rho - min_ab + 1));
327 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
328 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
329 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
330 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
332 s->sprite_shift[0] = alpha + beta + rho - min_ab;
333 s->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
336 /* try to simplify the situation */
337 if (s->sprite_delta[0][0] == a << s->sprite_shift[0] &&
338 s->sprite_delta[0][1] == 0 &&
339 s->sprite_delta[1][0] == 0 &&
340 s->sprite_delta[1][1] == a << s->sprite_shift[0]) {
341 s->sprite_offset[0][0] >>= s->sprite_shift[0];
342 s->sprite_offset[0][1] >>= s->sprite_shift[0];
343 s->sprite_offset[1][0] >>= s->sprite_shift[1];
344 s->sprite_offset[1][1] >>= s->sprite_shift[1];
345 s->sprite_delta[0][0] = a;
346 s->sprite_delta[0][1] = 0;
347 s->sprite_delta[1][0] = 0;
348 s->sprite_delta[1][1] = a;
349 s->sprite_shift[0] = 0;
350 s->sprite_shift[1] = 0;
351 s->real_sprite_warping_points = 1;
353 int shift_y = 16 - s->sprite_shift[0];
354 int shift_c = 16 - s->sprite_shift[1];
355 for (i = 0; i < 2; i++) {
356 s->sprite_offset[0][i] <<= shift_y;
357 s->sprite_offset[1][i] <<= shift_c;
358 s->sprite_delta[0][i] <<= shift_y;
359 s->sprite_delta[1][i] <<= shift_y;
360 s->sprite_shift[i] = 16;
362 s->real_sprite_warping_points = s->num_sprite_warping_points;
369 * Decode the next video packet.
370 * @return <0 if something went wrong
372 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
374 MpegEncContext *s = &ctx->m;
376 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
377 int header_extension = 0, mb_num, len;
379 /* is there enough space left for a video packet + header */
380 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
383 for (len = 0; len < 32; len++)
384 if (get_bits1(&s->gb))
387 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
388 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
392 if (ctx->shape != RECT_SHAPE) {
393 header_extension = get_bits1(&s->gb);
394 // FIXME more stuff here
397 mb_num = get_bits(&s->gb, mb_num_bits);
398 if (mb_num >= s->mb_num) {
399 av_log(s->avctx, AV_LOG_ERROR,
400 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
403 if (s->pict_type == AV_PICTURE_TYPE_B) {
404 int mb_x = 0, mb_y = 0;
406 while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
408 ff_thread_await_progress(&s->next_picture_ptr->tf, mb_y++, 0);
410 if (++mb_x == s->mb_width)
413 if (mb_num >= s->mb_num)
414 return -1; // slice contains just skipped MBs (already decoded)
417 s->mb_x = mb_num % s->mb_width;
418 s->mb_y = mb_num / s->mb_width;
420 if (ctx->shape != BIN_ONLY_SHAPE) {
421 int qscale = get_bits(&s->gb, s->quant_precision);
423 s->chroma_qscale = s->qscale = qscale;
426 if (ctx->shape == RECT_SHAPE)
427 header_extension = get_bits1(&s->gb);
429 if (header_extension) {
432 while (get_bits1(&s->gb) != 0)
435 check_marker(&s->gb, "before time_increment in video packed header");
436 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
437 check_marker(&s->gb, "before vop_coding_type in video packed header");
439 skip_bits(&s->gb, 2); /* vop coding type */
440 // FIXME not rect stuff here
442 if (ctx->shape != BIN_ONLY_SHAPE) {
443 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
444 // FIXME don't just ignore everything
445 if (s->pict_type == AV_PICTURE_TYPE_S &&
446 ctx->vol_sprite_usage == GMC_SPRITE) {
447 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
448 return AVERROR_INVALIDDATA;
449 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
452 // FIXME reduced res stuff here
454 if (s->pict_type != AV_PICTURE_TYPE_I) {
455 int f_code = get_bits(&s->gb, 3); /* fcode_for */
457 av_log(s->avctx, AV_LOG_ERROR,
458 "Error, video packet header damaged (f_code=0)\n");
460 if (s->pict_type == AV_PICTURE_TYPE_B) {
461 int b_code = get_bits(&s->gb, 3);
463 av_log(s->avctx, AV_LOG_ERROR,
464 "Error, video packet header damaged (b_code=0)\n");
468 // FIXME new-pred stuff
474 * Get the average motion vector for a GMC MB.
475 * @param n either 0 for the x component or 1 for y
476 * @return the average MV for a GMC MB
478 static inline int get_amv(Mpeg4DecContext *ctx, int n)
480 MpegEncContext *s = &ctx->m;
481 int x, y, mb_v, sum, dx, dy, shift;
482 int len = 1 << (s->f_code + 4);
483 const int a = s->sprite_warping_accuracy;
485 if (s->workaround_bugs & FF_BUG_AMV)
486 len >>= s->quarter_sample;
488 if (s->real_sprite_warping_points == 1) {
489 if (ctx->divx_version == 500 && ctx->divx_build == 413)
490 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
492 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
494 dx = s->sprite_delta[n][0];
495 dy = s->sprite_delta[n][1];
496 shift = s->sprite_shift[0];
498 dy -= 1 << (shift + a + 1);
500 dx -= 1 << (shift + a + 1);
501 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
504 for (y = 0; y < 16; y++) {
509 for (x = 0; x < 16; x++) {
514 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
526 * Decode the dc value.
527 * @param n block index (0-3 are luma, 4-5 are chroma)
528 * @param dir_ptr the prediction direction will be stored here
529 * @return the quantized dc
531 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
536 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
538 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
540 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
541 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
550 level = 2 * get_bits1(&s->gb) - 1;
552 if (get_bits1(&s->gb))
553 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
555 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
558 level = get_xbits(&s->gb, code);
562 if (get_bits1(&s->gb) == 0) { /* marker */
563 if (s->err_recognition & AV_EF_BITSTREAM) {
564 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
571 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
575 * Decode first partition.
576 * @return number of MBs decoded or <0 if an error occurred
578 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
580 MpegEncContext *s = &ctx->m;
582 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
584 /* decode first partition */
585 s->first_slice_line = 1;
586 for (; s->mb_y < s->mb_height; s->mb_y++) {
587 ff_init_block_index(s);
588 for (; s->mb_x < s->mb_width; s->mb_x++) {
589 const int xy = s->mb_x + s->mb_y * s->mb_stride;
594 ff_update_block_index(s);
595 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
596 s->first_slice_line = 0;
598 if (s->pict_type == AV_PICTURE_TYPE_I) {
602 if (show_bits_long(&s->gb, 19) == DC_MARKER)
605 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
607 av_log(s->avctx, AV_LOG_ERROR,
608 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
613 s->cbp_table[xy] = cbpc & 3;
614 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
618 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
620 s->current_picture.qscale_table[xy] = s->qscale;
622 s->mbintra_table[xy] = 1;
623 for (i = 0; i < 6; i++) {
625 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
627 av_log(s->avctx, AV_LOG_ERROR,
628 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
635 s->pred_dir_table[xy] = dir;
636 } else { /* P/S_TYPE */
637 int mx, my, pred_x, pred_y, bits;
638 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
639 const int stride = s->b8_stride * 2;
642 bits = show_bits(&s->gb, 17);
643 if (bits == MOTION_MARKER)
647 if (bits & 0x10000) {
649 if (s->pict_type == AV_PICTURE_TYPE_S &&
650 ctx->vol_sprite_usage == GMC_SPRITE) {
651 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
655 mx = get_amv(ctx, 0);
656 my = get_amv(ctx, 1);
658 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
665 mot_val[0 + stride] =
666 mot_val[2 + stride] = mx;
669 mot_val[1 + stride] =
670 mot_val[3 + stride] = my;
672 if (s->mbintra_table[xy])
673 ff_clean_intra_table_entries(s);
677 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
679 av_log(s->avctx, AV_LOG_ERROR,
680 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
686 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
688 s->mb_intra = ((cbpc & 4) != 0);
691 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
692 s->mbintra_table[xy] = 1;
695 mot_val[0 + stride] =
696 mot_val[2 + stride] = 0;
699 mot_val[1 + stride] =
700 mot_val[3 + stride] = 0;
702 if (s->mbintra_table[xy])
703 ff_clean_intra_table_entries(s);
705 if (s->pict_type == AV_PICTURE_TYPE_S &&
706 ctx->vol_sprite_usage == GMC_SPRITE &&
708 s->mcsel = get_bits1(&s->gb);
712 if ((cbpc & 16) == 0) {
713 /* 16x16 motion prediction */
715 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
717 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
721 my = ff_h263_decode_motion(s, pred_y, s->f_code);
724 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
727 mx = get_amv(ctx, 0);
728 my = get_amv(ctx, 1);
729 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
736 mot_val[0 + stride] =
737 mot_val[2 + stride] = mx;
740 mot_val[1 + stride] =
741 mot_val[3 + stride] = my;
744 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
746 for (i = 0; i < 4; i++) {
747 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
748 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
752 my = ff_h263_decode_motion(s, pred_y, s->f_code);
769 * decode second partition.
770 * @return <0 if an error occurred
772 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
775 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
777 s->mb_x = s->resync_mb_x;
778 s->first_slice_line = 1;
779 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
780 ff_init_block_index(s);
781 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
782 const int xy = s->mb_x + s->mb_y * s->mb_stride;
785 ff_update_block_index(s);
786 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
787 s->first_slice_line = 0;
789 if (s->pict_type == AV_PICTURE_TYPE_I) {
790 int ac_pred = get_bits1(&s->gb);
791 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
793 av_log(s->avctx, AV_LOG_ERROR,
794 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
798 s->cbp_table[xy] |= cbpy << 2;
799 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
800 } else { /* P || S_TYPE */
801 if (IS_INTRA(s->current_picture.mb_type[xy])) {
804 int ac_pred = get_bits1(&s->gb);
805 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
808 av_log(s->avctx, AV_LOG_ERROR,
809 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
813 if (s->cbp_table[xy] & 8)
814 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
815 s->current_picture.qscale_table[xy] = s->qscale;
817 for (i = 0; i < 6; i++) {
819 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
821 av_log(s->avctx, AV_LOG_ERROR,
822 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
829 s->cbp_table[xy] &= 3; // remove dquant
830 s->cbp_table[xy] |= cbpy << 2;
831 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
832 s->pred_dir_table[xy] = dir;
833 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
834 s->current_picture.qscale_table[xy] = s->qscale;
835 s->cbp_table[xy] = 0;
837 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
840 av_log(s->avctx, AV_LOG_ERROR,
841 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
845 if (s->cbp_table[xy] & 8)
846 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
847 s->current_picture.qscale_table[xy] = s->qscale;
849 s->cbp_table[xy] &= 3; // remove dquant
850 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
854 if (mb_num >= mb_count)
862 * Decode the first and second partition.
863 * @return <0 if error (and sets error type in the error_status_table)
865 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
867 MpegEncContext *s = &ctx->m;
869 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
870 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
872 mb_num = mpeg4_decode_partition_a(ctx);
874 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
875 s->mb_x, s->mb_y, part_a_error);
879 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
880 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
881 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
882 s->mb_x, s->mb_y, part_a_error);
886 s->mb_num_left = mb_num;
888 if (s->pict_type == AV_PICTURE_TYPE_I) {
889 while (show_bits(&s->gb, 9) == 1)
890 skip_bits(&s->gb, 9);
891 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
892 av_log(s->avctx, AV_LOG_ERROR,
893 "marker missing after first I partition at %d %d\n",
898 while (show_bits(&s->gb, 10) == 1)
899 skip_bits(&s->gb, 10);
900 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
901 av_log(s->avctx, AV_LOG_ERROR,
902 "marker missing after first P partition at %d %d\n",
907 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
908 s->mb_x - 1, s->mb_y, part_a_end);
910 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
911 if (s->pict_type == AV_PICTURE_TYPE_P)
912 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
913 s->mb_x, s->mb_y, ER_DC_ERROR);
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 - 1, s->mb_y, ER_DC_END);
926 * @return <0 if an error occurred
928 static inline int mpeg4_decode_block(MpegEncContext *s, int16_t *block,
929 int n, int coded, int intra, int rvlc)
931 int level, i, last, run, qmul, qadd, dc_pred_dir;
934 const uint8_t *scan_table;
936 // Note intra & rvlc should be optimized away if this is inlined
939 if (s->use_intra_dc_vlc) {
941 if (s->partitioned_frame) {
942 level = s->dc_val[0][s->block_index[n]];
944 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
946 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
947 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
949 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
957 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
963 rl = &ff_rvlc_rl_intra;
964 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
966 rl = &ff_mpeg4_rl_intra;
967 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
970 if (dc_pred_dir == 0)
971 scan_table = s->intra_v_scantable.permutated; /* left */
973 scan_table = s->intra_h_scantable.permutated; /* top */
975 scan_table = s->intra_scantable.permutated;
982 s->block_last_index[n] = i;
986 rl = &ff_rvlc_rl_inter;
988 rl = &ff_h263_rl_inter;
990 scan_table = s->intra_scantable.permutated;
996 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
998 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1000 qmul = s->qscale << 1;
1001 qadd = (s->qscale - 1) | 1;
1003 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1005 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1009 OPEN_READER(re, &s->gb);
1011 UPDATE_CACHE(re, &s->gb);
1012 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1016 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1017 av_log(s->avctx, AV_LOG_ERROR,
1018 "1. marker bit missing in rvlc esc\n");
1021 SKIP_CACHE(re, &s->gb, 1);
1023 last = SHOW_UBITS(re, &s->gb, 1);
1024 SKIP_CACHE(re, &s->gb, 1);
1025 run = SHOW_UBITS(re, &s->gb, 6);
1026 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1027 UPDATE_CACHE(re, &s->gb);
1029 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1030 av_log(s->avctx, AV_LOG_ERROR,
1031 "2. marker bit missing in rvlc esc\n");
1034 SKIP_CACHE(re, &s->gb, 1);
1036 level = SHOW_UBITS(re, &s->gb, 11);
1037 SKIP_CACHE(re, &s->gb, 11);
1039 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1040 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1043 SKIP_CACHE(re, &s->gb, 5);
1045 level = level * qmul + qadd;
1046 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1047 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1054 cache = GET_CACHE(re, &s->gb);
1057 cache ^= 0xC0000000;
1059 if (cache & 0x80000000) {
1060 if (cache & 0x40000000) {
1062 SKIP_CACHE(re, &s->gb, 2);
1063 last = SHOW_UBITS(re, &s->gb, 1);
1064 SKIP_CACHE(re, &s->gb, 1);
1065 run = SHOW_UBITS(re, &s->gb, 6);
1066 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1067 UPDATE_CACHE(re, &s->gb);
1070 level = SHOW_SBITS(re, &s->gb, 12);
1071 LAST_SKIP_BITS(re, &s->gb, 12);
1073 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1074 av_log(s->avctx, AV_LOG_ERROR,
1075 "1. marker bit missing in 3. esc\n");
1078 SKIP_CACHE(re, &s->gb, 1);
1080 level = SHOW_SBITS(re, &s->gb, 12);
1081 SKIP_CACHE(re, &s->gb, 12);
1083 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1084 av_log(s->avctx, AV_LOG_ERROR,
1085 "2. marker bit missing in 3. esc\n");
1089 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1093 level = level * qmul + qadd;
1095 level = level * qmul - qadd;
1097 if ((unsigned)(level + 2048) > 4095) {
1098 if (s->err_recognition & AV_EF_BITSTREAM) {
1099 if (level > 2560 || level < -2560) {
1100 av_log(s->avctx, AV_LOG_ERROR,
1101 "|level| overflow in 3. esc, qp=%d\n",
1106 level = level < 0 ? -2048 : 2047;
1114 SKIP_BITS(re, &s->gb, 2);
1115 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1116 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1117 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1118 LAST_SKIP_BITS(re, &s->gb, 1);
1122 SKIP_BITS(re, &s->gb, 1);
1123 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1125 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1126 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1127 LAST_SKIP_BITS(re, &s->gb, 1);
1132 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1133 LAST_SKIP_BITS(re, &s->gb, 1);
1138 av_log(s->avctx, AV_LOG_ERROR,
1139 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1143 block[scan_table[i]] = level;
1147 block[scan_table[i]] = level;
1149 CLOSE_READER(re, &s->gb);
1154 if (!s->use_intra_dc_vlc) {
1155 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1157 i -= i >> 31; // if (i == -1) i = 0;
1160 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1162 i = 63; // FIXME not optimal
1164 s->block_last_index[n] = i;
1169 * decode partition C of one MB.
1170 * @return <0 if an error occurred
1172 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1174 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1176 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1178 mb_type = s->current_picture.mb_type[xy];
1179 cbp = s->cbp_table[xy];
1181 s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
1183 if (s->current_picture.qscale_table[xy] != s->qscale)
1184 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1186 if (s->pict_type == AV_PICTURE_TYPE_P ||
1187 s->pict_type == AV_PICTURE_TYPE_S) {
1189 for (i = 0; i < 4; i++) {
1190 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1191 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1193 s->mb_intra = IS_INTRA(mb_type);
1195 if (IS_SKIP(mb_type)) {
1197 for (i = 0; i < 6; i++)
1198 s->block_last_index[i] = -1;
1199 s->mv_dir = MV_DIR_FORWARD;
1200 s->mv_type = MV_TYPE_16X16;
1201 if (s->pict_type == AV_PICTURE_TYPE_S
1202 && ctx->vol_sprite_usage == GMC_SPRITE) {
1209 } else if (s->mb_intra) {
1210 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1211 } else if (!s->mb_intra) {
1212 // s->mcsel = 0; // FIXME do we need to init that?
1214 s->mv_dir = MV_DIR_FORWARD;
1215 if (IS_8X8(mb_type)) {
1216 s->mv_type = MV_TYPE_8X8;
1218 s->mv_type = MV_TYPE_16X16;
1221 } else { /* I-Frame */
1223 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1226 if (!IS_SKIP(mb_type)) {
1228 s->dsp.clear_blocks(s->block[0]);
1229 /* decode each block */
1230 for (i = 0; i < 6; i++) {
1231 if (mpeg4_decode_block(s, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1232 av_log(s->avctx, AV_LOG_ERROR,
1233 "texture corrupted at %d %d %d\n",
1234 s->mb_x, s->mb_y, s->mb_intra);
1241 /* per-MB end of slice check */
1242 if (--s->mb_num_left <= 0) {
1243 if (mpeg4_is_resync(s))
1248 if (mpeg4_is_resync(s)) {
1249 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1250 if (s->cbp_table[xy + delta])
1257 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1259 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1260 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1262 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1263 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1265 assert(s->h263_pred);
1267 if (s->pict_type == AV_PICTURE_TYPE_P ||
1268 s->pict_type == AV_PICTURE_TYPE_S) {
1270 if (get_bits1(&s->gb)) {
1273 for (i = 0; i < 6; i++)
1274 s->block_last_index[i] = -1;
1275 s->mv_dir = MV_DIR_FORWARD;
1276 s->mv_type = MV_TYPE_16X16;
1277 if (s->pict_type == AV_PICTURE_TYPE_S &&
1278 ctx->vol_sprite_usage == GMC_SPRITE) {
1279 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1284 s->mv[0][0][0] = get_amv(ctx, 0);
1285 s->mv[0][0][1] = get_amv(ctx, 1);
1288 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1298 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1300 av_log(s->avctx, AV_LOG_ERROR,
1301 "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1304 } while (cbpc == 20);
1306 s->dsp.clear_blocks(s->block[0]);
1308 s->mb_intra = ((cbpc & 4) != 0);
1312 if (s->pict_type == AV_PICTURE_TYPE_S &&
1313 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1314 s->mcsel = get_bits1(&s->gb);
1317 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1319 cbp = (cbpc & 3) | (cbpy << 2);
1321 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1322 if ((!s->progressive_sequence) &&
1323 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1324 s->interlaced_dct = get_bits1(&s->gb);
1326 s->mv_dir = MV_DIR_FORWARD;
1327 if ((cbpc & 16) == 0) {
1329 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1332 /* 16x16 global motion prediction */
1333 s->mv_type = MV_TYPE_16X16;
1334 mx = get_amv(ctx, 0);
1335 my = get_amv(ctx, 1);
1336 s->mv[0][0][0] = mx;
1337 s->mv[0][0][1] = my;
1338 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1339 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1342 /* 16x8 field motion prediction */
1343 s->mv_type = MV_TYPE_FIELD;
1345 s->field_select[0][0] = get_bits1(&s->gb);
1346 s->field_select[0][1] = get_bits1(&s->gb);
1348 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1350 for (i = 0; i < 2; i++) {
1351 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1355 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1359 s->mv[0][i][0] = mx;
1360 s->mv[0][i][1] = my;
1363 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1364 /* 16x16 motion prediction */
1365 s->mv_type = MV_TYPE_16X16;
1366 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1367 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1372 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1376 s->mv[0][0][0] = mx;
1377 s->mv[0][0][1] = my;
1380 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1381 s->mv_type = MV_TYPE_8X8;
1382 for (i = 0; i < 4; i++) {
1383 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1384 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1388 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1391 s->mv[0][i][0] = mx;
1392 s->mv[0][i][1] = my;
1397 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1398 int modb1; // first bit of modb
1399 int modb2; // second bit of modb
1402 s->mb_intra = 0; // B-frames never contain intra blocks
1403 s->mcsel = 0; // ... true gmc blocks
1406 for (i = 0; i < 2; i++) {
1407 s->last_mv[i][0][0] =
1408 s->last_mv[i][0][1] =
1409 s->last_mv[i][1][0] =
1410 s->last_mv[i][1][1] = 0;
1413 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1416 /* if we skipped it in the future P Frame than skip it now too */
1417 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1419 if (s->mb_skipped) {
1421 for (i = 0; i < 6; i++)
1422 s->block_last_index[i] = -1;
1424 s->mv_dir = MV_DIR_FORWARD;
1425 s->mv_type = MV_TYPE_16X16;
1430 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1436 modb1 = get_bits1(&s->gb);
1438 // like MB_TYPE_B_DIRECT but no vectors coded
1439 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1442 modb2 = get_bits1(&s->gb);
1443 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1445 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1448 mb_type = mb_type_b_map[mb_type];
1452 s->dsp.clear_blocks(s->block[0]);
1453 cbp = get_bits(&s->gb, 6);
1456 if ((!IS_DIRECT(mb_type)) && cbp) {
1457 if (get_bits1(&s->gb))
1458 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1461 if (!s->progressive_sequence) {
1463 s->interlaced_dct = get_bits1(&s->gb);
1465 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1466 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1467 mb_type &= ~MB_TYPE_16x16;
1469 if (USES_LIST(mb_type, 0)) {
1470 s->field_select[0][0] = get_bits1(&s->gb);
1471 s->field_select[0][1] = get_bits1(&s->gb);
1473 if (USES_LIST(mb_type, 1)) {
1474 s->field_select[1][0] = get_bits1(&s->gb);
1475 s->field_select[1][1] = get_bits1(&s->gb);
1481 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1482 s->mv_type = MV_TYPE_16X16;
1484 if (USES_LIST(mb_type, 0)) {
1485 s->mv_dir = MV_DIR_FORWARD;
1487 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1488 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1489 s->last_mv[0][1][0] =
1490 s->last_mv[0][0][0] =
1491 s->mv[0][0][0] = mx;
1492 s->last_mv[0][1][1] =
1493 s->last_mv[0][0][1] =
1494 s->mv[0][0][1] = my;
1497 if (USES_LIST(mb_type, 1)) {
1498 s->mv_dir |= MV_DIR_BACKWARD;
1500 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1501 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1502 s->last_mv[1][1][0] =
1503 s->last_mv[1][0][0] =
1504 s->mv[1][0][0] = mx;
1505 s->last_mv[1][1][1] =
1506 s->last_mv[1][0][1] =
1507 s->mv[1][0][1] = my;
1509 } else if (!IS_DIRECT(mb_type)) {
1510 s->mv_type = MV_TYPE_FIELD;
1512 if (USES_LIST(mb_type, 0)) {
1513 s->mv_dir = MV_DIR_FORWARD;
1515 for (i = 0; i < 2; i++) {
1516 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1517 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1518 s->last_mv[0][i][0] =
1519 s->mv[0][i][0] = mx;
1520 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1524 if (USES_LIST(mb_type, 1)) {
1525 s->mv_dir |= MV_DIR_BACKWARD;
1527 for (i = 0; i < 2; i++) {
1528 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1529 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1530 s->last_mv[1][i][0] =
1531 s->mv[1][i][0] = mx;
1532 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1538 if (IS_DIRECT(mb_type)) {
1539 if (IS_SKIP(mb_type)) {
1543 mx = ff_h263_decode_motion(s, 0, 1);
1544 my = ff_h263_decode_motion(s, 0, 1);
1547 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1548 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1550 s->current_picture.mb_type[xy] = mb_type;
1551 } else { /* I-Frame */
1553 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1555 av_log(s->avctx, AV_LOG_ERROR,
1556 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1559 } while (cbpc == 8);
1565 s->ac_pred = get_bits1(&s->gb);
1567 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1569 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1571 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1573 av_log(s->avctx, AV_LOG_ERROR,
1574 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1577 cbp = (cbpc & 3) | (cbpy << 2);
1579 s->use_intra_dc_vlc = s->qscale < s->intra_dc_threshold;
1582 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1584 if (!s->progressive_sequence)
1585 s->interlaced_dct = get_bits1(&s->gb);
1587 s->dsp.clear_blocks(s->block[0]);
1588 /* decode each block */
1589 for (i = 0; i < 6; i++) {
1590 if (mpeg4_decode_block(s, block[i], i, cbp & 32, 1, 0) < 0)
1597 /* decode each block */
1598 for (i = 0; i < 6; i++) {
1599 if (mpeg4_decode_block(s, block[i], i, cbp & 32, 0, 0) < 0)
1605 /* per-MB end of slice check */
1606 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1607 if (mpeg4_is_resync(s)) {
1608 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1610 if (s->pict_type == AV_PICTURE_TYPE_B &&
1611 s->next_picture.mbskip_table[xy + delta]) {
1612 ff_thread_await_progress(&s->next_picture_ptr->tf,
1613 (s->mb_x + delta >= s->mb_width)
1614 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1618 if (s->pict_type == AV_PICTURE_TYPE_B &&
1619 s->next_picture.mbskip_table[xy + delta])
1628 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1630 int hours, minutes, seconds;
1631 unsigned time_code = show_bits(gb, 18);
1633 if (time_code & 0x40) { /* marker_bit */
1634 hours = time_code >> 13;
1635 minutes = time_code >> 7 & 0x3f;
1636 seconds = time_code & 0x3f;
1637 s->time_base = seconds + 60 * (minutes + 60 * hours);
1638 skip_bits(gb, 20); /* time_code, closed_gov, broken_link */
1640 av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
1646 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1648 int profile_and_level_indication;
1650 profile_and_level_indication = get_bits(gb, 8);
1652 s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
1653 s->avctx->level = (profile_and_level_indication & 0x0f);
1655 // for Simple profile, level 0
1656 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1657 s->avctx->level = 0;
1663 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1665 MpegEncContext *s = &ctx->m;
1666 int width, height, vo_ver_id;
1669 skip_bits(gb, 1); /* random access */
1670 s->vo_type = get_bits(gb, 8);
1671 if (get_bits1(gb) != 0) { /* is_ol_id */
1672 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1673 skip_bits(gb, 3); /* vo_priority */
1677 s->aspect_ratio_info = get_bits(gb, 4);
1678 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1679 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1680 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1682 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1685 if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1686 int chroma_format = get_bits(gb, 2);
1687 if (chroma_format != CHROMA_420)
1688 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1690 s->low_delay = get_bits1(gb);
1691 if (get_bits1(gb)) { /* vbv parameters */
1692 get_bits(gb, 15); /* first_half_bitrate */
1693 skip_bits1(gb); /* marker */
1694 get_bits(gb, 15); /* latter_half_bitrate */
1695 skip_bits1(gb); /* marker */
1696 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1697 skip_bits1(gb); /* marker */
1698 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1699 get_bits(gb, 11); /* first_half_vbv_occupancy */
1700 skip_bits1(gb); /* marker */
1701 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1702 skip_bits1(gb); /* marker */
1705 /* is setting low delay flag only once the smartest thing to do?
1706 * low delay detection won't be overriden. */
1707 if (s->picture_number == 0)
1711 ctx->shape = get_bits(gb, 2); /* vol shape */
1712 if (ctx->shape != RECT_SHAPE)
1713 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1714 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1715 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1716 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1719 check_marker(gb, "before time_increment_resolution");
1721 s->avctx->time_base.den = get_bits(gb, 16);
1722 if (!s->avctx->time_base.den) {
1723 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1724 s->avctx->time_base.num = 0;
1728 ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1729 if (ctx->time_increment_bits < 1)
1730 ctx->time_increment_bits = 1;
1732 check_marker(gb, "before fixed_vop_rate");
1734 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1735 s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits);
1737 s->avctx->time_base.num = 1;
1741 if (ctx->shape != BIN_ONLY_SHAPE) {
1742 if (ctx->shape == RECT_SHAPE) {
1743 skip_bits1(gb); /* marker */
1744 width = get_bits(gb, 13);
1745 skip_bits1(gb); /* marker */
1746 height = get_bits(gb, 13);
1747 skip_bits1(gb); /* marker */
1748 if (width && height && /* they should be non zero but who knows */
1749 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1750 if (s->width && s->height &&
1751 (s->width != width || s->height != height))
1752 s->context_reinit = 1;
1758 s->progressive_sequence =
1759 s->progressive_frame = get_bits1(gb) ^ 1;
1760 s->interlaced_dct = 0;
1761 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1762 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1763 "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1765 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1767 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1769 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1770 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1771 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1772 ctx->vol_sprite_usage == GMC_SPRITE) {
1773 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1774 skip_bits(gb, 13); // sprite_width
1775 skip_bits1(gb); /* marker */
1776 skip_bits(gb, 13); // sprite_height
1777 skip_bits1(gb); /* marker */
1778 skip_bits(gb, 13); // sprite_left
1779 skip_bits1(gb); /* marker */
1780 skip_bits(gb, 13); // sprite_top
1781 skip_bits1(gb); /* marker */
1783 s->num_sprite_warping_points = get_bits(gb, 6);
1784 if (s->num_sprite_warping_points > 3) {
1785 av_log(s->avctx, AV_LOG_ERROR,
1786 "%d sprite_warping_points\n",
1787 s->num_sprite_warping_points);
1788 s->num_sprite_warping_points = 0;
1791 s->sprite_warping_accuracy = get_bits(gb, 2);
1792 s->sprite_brightness_change = get_bits1(gb);
1793 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1794 skip_bits1(gb); // low_latency_sprite
1796 // FIXME sadct disable bit if verid!=1 && shape not rect
1798 if (get_bits1(gb) == 1) { /* not_8_bit */
1799 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1800 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1801 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1802 if (s->quant_precision != 5)
1803 av_log(s->avctx, AV_LOG_ERROR,
1804 "quant precision %d\n", s->quant_precision);
1806 s->quant_precision = 5;
1809 // FIXME a bunch of grayscale shape things
1811 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1814 /* load default matrixes */
1815 for (i = 0; i < 64; i++) {
1816 int j = s->dsp.idct_permutation[i];
1817 v = ff_mpeg4_default_intra_matrix[i];
1818 s->intra_matrix[j] = v;
1819 s->chroma_intra_matrix[j] = v;
1821 v = ff_mpeg4_default_non_intra_matrix[i];
1822 s->inter_matrix[j] = v;
1823 s->chroma_inter_matrix[j] = v;
1826 /* load custom intra matrix */
1827 if (get_bits1(gb)) {
1829 for (i = 0; i < 64; i++) {
1831 v = get_bits(gb, 8);
1836 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1837 s->intra_matrix[j] = last;
1838 s->chroma_intra_matrix[j] = last;
1841 /* replicate last value */
1842 for (; i < 64; i++) {
1843 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1844 s->intra_matrix[j] = last;
1845 s->chroma_intra_matrix[j] = last;
1849 /* load custom non intra matrix */
1850 if (get_bits1(gb)) {
1852 for (i = 0; i < 64; i++) {
1854 v = get_bits(gb, 8);
1859 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1860 s->inter_matrix[j] = v;
1861 s->chroma_inter_matrix[j] = v;
1864 /* replicate last value */
1865 for (; i < 64; i++) {
1866 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1867 s->inter_matrix[j] = last;
1868 s->chroma_inter_matrix[j] = last;
1872 // FIXME a bunch of grayscale shape things
1876 s->quarter_sample = get_bits1(gb);
1878 s->quarter_sample = 0;
1880 if (!get_bits1(gb)) {
1881 int pos = get_bits_count(gb);
1882 int estimation_method = get_bits(gb, 2);
1883 if (estimation_method < 2) {
1884 if (!get_bits1(gb)) {
1885 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1886 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1887 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1888 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1889 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1890 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1892 if (!get_bits1(gb)) {
1893 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1894 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1895 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1896 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1898 if (!check_marker(gb, "in complexity estimation part 1")) {
1899 skip_bits_long(gb, pos - get_bits_count(gb));
1902 if (!get_bits1(gb)) {
1903 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1904 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1905 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1906 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1908 if (!get_bits1(gb)) {
1909 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1910 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1911 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1912 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1913 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1914 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1916 if (!check_marker(gb, "in complexity estimation part 2")) {
1917 skip_bits_long(gb, pos - get_bits_count(gb));
1920 if (estimation_method == 1) {
1921 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1922 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1925 av_log(s->avctx, AV_LOG_ERROR,
1926 "Invalid Complexity estimation method %d\n",
1931 ctx->cplx_estimation_trash_i =
1932 ctx->cplx_estimation_trash_p =
1933 ctx->cplx_estimation_trash_b = 0;
1936 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1938 s->data_partitioning = get_bits1(gb);
1939 if (s->data_partitioning)
1940 ctx->rvlc = get_bits1(gb);
1942 if (vo_ver_id != 1) {
1943 ctx->new_pred = get_bits1(gb);
1944 if (ctx->new_pred) {
1945 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1946 skip_bits(gb, 2); /* requested upstream message type */
1947 skip_bits1(gb); /* newpred segment type */
1949 if (get_bits1(gb)) // reduced_res_vop
1950 av_log(s->avctx, AV_LOG_ERROR,
1951 "reduced resolution VOP not supported\n");
1956 s->scalability = get_bits1(gb);
1958 if (s->scalability) {
1959 GetBitContext bak = *gb;
1960 int h_sampling_factor_n;
1961 int h_sampling_factor_m;
1962 int v_sampling_factor_n;
1963 int v_sampling_factor_m;
1965 skip_bits1(gb); // hierarchy_type
1966 skip_bits(gb, 4); /* ref_layer_id */
1967 skip_bits1(gb); /* ref_layer_sampling_dir */
1968 h_sampling_factor_n = get_bits(gb, 5);
1969 h_sampling_factor_m = get_bits(gb, 5);
1970 v_sampling_factor_n = get_bits(gb, 5);
1971 v_sampling_factor_m = get_bits(gb, 5);
1972 s->enhancement_type = get_bits1(gb);
1974 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
1975 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
1976 /* illegal scalability header (VERY broken encoder),
1977 * trying to workaround */
1981 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
1983 // bin shape stuff FIXME
1991 * Decode the user data stuff in the header.
1992 * Also initializes divx/xvid/lavc_version/build.
1994 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
1996 MpegEncContext *s = &ctx->m;
2000 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2003 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2004 if (show_bits(gb, 23) == 0)
2006 buf[i] = get_bits(gb, 8);
2010 /* divx detection */
2011 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2013 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2015 ctx->divx_version = ver;
2016 ctx->divx_build = build;
2017 s->divx_packed = e == 3 && last == 'p';
2018 if (s->divx_packed && !s->showed_packed_warning) {
2019 av_log(s->avctx, AV_LOG_WARNING,
2020 "Invalid and inefficient vfw-avi packed B frames detected\n");
2021 s->showed_packed_warning = 1;
2025 /* libavcodec detection */
2026 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2028 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2030 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2032 build = (ver << 16) + (ver2 << 8) + ver3;
2035 if (strcmp(buf, "ffmpeg") == 0)
2036 ctx->lavc_build = 4600;
2039 ctx->lavc_build = build;
2041 /* Xvid detection */
2042 e = sscanf(buf, "XviD%d", &build);
2044 ctx->xvid_build = build;
2049 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2051 MpegEncContext *s = &ctx->m;
2052 int time_incr, time_increment;
2054 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2055 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2056 s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2057 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2061 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2062 if (s->partitioned_frame)
2063 s->decode_mb = mpeg4_decode_partitioned_mb;
2065 s->decode_mb = mpeg4_decode_mb;
2068 while (get_bits1(gb) != 0)
2071 check_marker(gb, "before time_increment");
2073 if (ctx->time_increment_bits == 0 ||
2074 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2075 av_log(s->avctx, AV_LOG_ERROR,
2076 "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2078 for (ctx->time_increment_bits = 1;
2079 ctx->time_increment_bits < 16;
2080 ctx->time_increment_bits++) {
2081 if (s->pict_type == AV_PICTURE_TYPE_P ||
2082 (s->pict_type == AV_PICTURE_TYPE_S &&
2083 ctx->vol_sprite_usage == GMC_SPRITE)) {
2084 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2086 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2090 av_log(s->avctx, AV_LOG_ERROR,
2091 "my guess is %d bits ;)\n", ctx->time_increment_bits);
2095 time_increment = get_bits1(gb); // FIXME investigate further
2097 time_increment = get_bits(gb, ctx->time_increment_bits);
2099 if (s->pict_type != AV_PICTURE_TYPE_B) {
2100 s->last_time_base = s->time_base;
2101 s->time_base += time_incr;
2102 s->time = s->time_base * s->avctx->time_base.den + time_increment;
2103 if (s->workaround_bugs & FF_BUG_UMP4) {
2104 if (s->time < s->last_non_b_time) {
2105 /* header is not mpeg-4-compatible, broken encoder,
2106 * trying to workaround */
2108 s->time += s->avctx->time_base.den;
2111 s->pp_time = s->time - s->last_non_b_time;
2112 s->last_non_b_time = s->time;
2114 s->time = (s->last_time_base + time_incr) * s->avctx->time_base.den + time_increment;
2115 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2116 if (s->pp_time <= s->pb_time ||
2117 s->pp_time <= s->pp_time - s->pb_time ||
2119 /* messed up order, maybe after seeking? skipping current b-frame */
2120 return FRAME_SKIPPED;
2122 ff_mpeg4_init_direct_mv(s);
2124 if (ctx->t_frame == 0)
2125 ctx->t_frame = s->pb_time;
2126 if (ctx->t_frame == 0)
2127 ctx->t_frame = 1; // 1/0 protection
2128 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2129 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2130 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2131 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2132 if (!s->progressive_sequence) {
2133 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
2134 return FRAME_SKIPPED;
2138 check_marker(gb, "before vop_coded");
2141 if (get_bits1(gb) != 1) {
2142 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2143 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2144 return FRAME_SKIPPED;
2146 if (ctx->shape != BIN_ONLY_SHAPE &&
2147 (s->pict_type == AV_PICTURE_TYPE_P ||
2148 (s->pict_type == AV_PICTURE_TYPE_S &&
2149 ctx->vol_sprite_usage == GMC_SPRITE))) {
2150 /* rounding type for motion estimation */
2151 s->no_rounding = get_bits1(gb);
2155 // FIXME reduced res stuff
2157 if (ctx->shape != RECT_SHAPE) {
2158 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2159 skip_bits(gb, 13); /* width */
2160 skip_bits1(gb); /* marker */
2161 skip_bits(gb, 13); /* height */
2162 skip_bits1(gb); /* marker */
2163 skip_bits(gb, 13); /* hor_spat_ref */
2164 skip_bits1(gb); /* marker */
2165 skip_bits(gb, 13); /* ver_spat_ref */
2167 skip_bits1(gb); /* change_CR_disable */
2169 if (get_bits1(gb) != 0)
2170 skip_bits(gb, 8); /* constant_alpha_value */
2173 // FIXME complexity estimation stuff
2175 if (ctx->shape != BIN_ONLY_SHAPE) {
2176 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2177 if (s->pict_type != AV_PICTURE_TYPE_I)
2178 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2179 if (s->pict_type == AV_PICTURE_TYPE_B)
2180 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2182 s->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2183 if (!s->progressive_sequence) {
2184 s->top_field_first = get_bits1(gb);
2185 s->alternate_scan = get_bits1(gb);
2187 s->alternate_scan = 0;
2190 if (s->alternate_scan) {
2191 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2192 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2193 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2194 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2196 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2197 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2198 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2199 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2202 if (s->pict_type == AV_PICTURE_TYPE_S &&
2203 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2204 ctx->vol_sprite_usage == GMC_SPRITE)) {
2205 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2206 return AVERROR_INVALIDDATA;
2207 if (s->sprite_brightness_change)
2208 av_log(s->avctx, AV_LOG_ERROR,
2209 "sprite_brightness_change not supported\n");
2210 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2211 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2214 if (ctx->shape != BIN_ONLY_SHAPE) {
2215 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2216 if (s->qscale == 0) {
2217 av_log(s->avctx, AV_LOG_ERROR,
2218 "Error, header damaged or not MPEG4 header (qscale=0)\n");
2219 return -1; // makes no sense to continue, as there is nothing left from the image then
2222 if (s->pict_type != AV_PICTURE_TYPE_I) {
2223 s->f_code = get_bits(gb, 3); /* fcode_for */
2224 if (s->f_code == 0) {
2225 av_log(s->avctx, AV_LOG_ERROR,
2226 "Error, header damaged or not MPEG4 header (f_code=0)\n");
2227 return -1; // makes no sense to continue, as there is nothing left from the image then
2232 if (s->pict_type == AV_PICTURE_TYPE_B) {
2233 s->b_code = get_bits(gb, 3);
2237 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2238 av_log(s->avctx, AV_LOG_DEBUG,
2239 "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\n",
2240 s->qscale, s->f_code, s->b_code,
2241 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")),
2242 gb->size_in_bits, s->progressive_sequence, s->alternate_scan,
2243 s->top_field_first, s->quarter_sample ? "q" : "h",
2244 s->data_partitioning, ctx->resync_marker,
2245 s->num_sprite_warping_points, s->sprite_warping_accuracy,
2246 1 - s->no_rounding, s->vo_type,
2247 s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
2248 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2249 ctx->cplx_estimation_trash_b);
2252 if (!s->scalability) {
2253 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2254 skip_bits1(gb); // vop shape coding type
2256 if (s->enhancement_type) {
2257 int load_backward_shape = get_bits1(gb);
2258 if (load_backward_shape)
2259 av_log(s->avctx, AV_LOG_ERROR,
2260 "load backward shape isn't supported\n");
2262 skip_bits(gb, 2); // ref_select_code
2265 /* detect buggy encoders which don't set the low_delay flag
2266 * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2267 * easily (although it's buggy too) */
2268 if (s->vo_type == 0 && s->vol_control_parameters == 0 &&
2269 ctx->divx_version == -1 && s->picture_number == 0) {
2270 av_log(s->avctx, AV_LOG_WARNING,
2271 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2275 s->picture_number++; // better than pic number==0 always ;)
2277 // FIXME add short header support
2278 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2279 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2281 if (s->workaround_bugs & FF_BUG_EDGE) {
2282 s->h_edge_pos = s->width;
2283 s->v_edge_pos = s->height;
2289 * Decode mpeg4 headers.
2290 * @return <0 if no VOP found (or a damaged one)
2291 * FRAME_SKIPPED if a not coded VOP is found
2292 * 0 if a VOP is found
2294 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2296 MpegEncContext *s = &ctx->m;
2297 unsigned startcode, v;
2299 /* search next start code */
2302 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2304 if (get_bits(gb, 8) == 0xF0)
2310 if (get_bits_count(gb) >= gb->size_in_bits) {
2311 if (gb->size_in_bits == 8 &&
2312 (ctx->divx_version >= 0 || ctx->xvid_build >= 0)) {
2313 av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
2314 return FRAME_SKIPPED; // divx bug
2316 return -1; // end of stream
2319 /* use the bits after the test */
2320 v = get_bits(gb, 8);
2321 startcode = ((startcode << 8) | v) & 0xffffffff;
2323 if ((startcode & 0xFFFFFF00) != 0x100)
2324 continue; // no startcode
2326 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2327 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2328 if (startcode <= 0x11F)
2329 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2330 else if (startcode <= 0x12F)
2331 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2332 else if (startcode <= 0x13F)
2333 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2334 else if (startcode <= 0x15F)
2335 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2336 else if (startcode <= 0x1AF)
2337 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2338 else if (startcode == 0x1B0)
2339 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2340 else if (startcode == 0x1B1)
2341 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2342 else if (startcode == 0x1B2)
2343 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2344 else if (startcode == 0x1B3)
2345 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2346 else if (startcode == 0x1B4)
2347 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2348 else if (startcode == 0x1B5)
2349 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2350 else if (startcode == 0x1B6)
2351 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2352 else if (startcode == 0x1B7)
2353 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2354 else if (startcode == 0x1B8)
2355 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2356 else if (startcode == 0x1B9)
2357 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2358 else if (startcode == 0x1BA)
2359 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2360 else if (startcode == 0x1BB)
2361 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2362 else if (startcode == 0x1BC)
2363 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2364 else if (startcode == 0x1BD)
2365 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2366 else if (startcode == 0x1BE)
2367 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2368 else if (startcode == 0x1BF)
2369 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2370 else if (startcode == 0x1C0)
2371 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2372 else if (startcode == 0x1C1)
2373 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2374 else if (startcode == 0x1C2)
2375 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2376 else if (startcode == 0x1C3)
2377 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2378 else if (startcode <= 0x1C5)
2379 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2380 else if (startcode <= 0x1FF)
2381 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2382 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2385 if (startcode >= 0x120 && startcode <= 0x12F) {
2386 if (decode_vol_header(ctx, gb) < 0)
2388 } else if (startcode == USER_DATA_STARTCODE) {
2389 decode_user_data(ctx, gb);
2390 } else if (startcode == GOP_STARTCODE) {
2391 mpeg4_decode_gop_header(s, gb);
2392 } else if (startcode == VOS_STARTCODE) {
2393 mpeg4_decode_profile_level(s, gb);
2394 } else if (startcode == VOP_STARTCODE) {
2403 if (s->flags & CODEC_FLAG_LOW_DELAY)
2405 s->avctx->has_b_frames = !s->low_delay;
2407 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2408 if (s->stream_codec_tag == AV_RL32("XVID") ||
2409 s->codec_tag == AV_RL32("XVID") ||
2410 s->codec_tag == AV_RL32("XVIX") ||
2411 s->codec_tag == AV_RL32("RMP4") ||
2412 s->codec_tag == AV_RL32("ZMP4") ||
2413 s->codec_tag == AV_RL32("SIPP"))
2414 ctx->xvid_build = 0;
2417 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2418 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2419 s->vol_control_parameters == 0)
2420 ctx->divx_version = 400; // divx 4
2422 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2424 ctx->divx_build = -1;
2427 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2428 if (s->codec_tag == AV_RL32("XVIX"))
2429 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2431 if (s->codec_tag == AV_RL32("UMP4"))
2432 s->workaround_bugs |= FF_BUG_UMP4;
2434 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2435 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2437 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2438 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2440 if (ctx->xvid_build <= 3U)
2441 s->padding_bug_score = 256 * 256 * 256 * 64;
2443 if (ctx->xvid_build <= 1U)
2444 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2446 if (ctx->xvid_build <= 12U)
2447 s->workaround_bugs |= FF_BUG_EDGE;
2449 if (ctx->xvid_build <= 32U)
2450 s->workaround_bugs |= FF_BUG_DC_CLIP;
2452 if (ctx->lavc_build < 4653U)
2453 s->workaround_bugs |= FF_BUG_STD_QPEL;
2455 if (ctx->lavc_build < 4655U)
2456 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2458 if (ctx->lavc_build < 4670U)
2459 s->workaround_bugs |= FF_BUG_EDGE;
2461 if (ctx->lavc_build <= 4712U)
2462 s->workaround_bugs |= FF_BUG_DC_CLIP;
2464 if (ctx->divx_version >= 0)
2465 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2467 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2468 s->padding_bug_score = 256 * 256 * 256 * 64;
2470 if (ctx->divx_version < 500U)
2471 s->workaround_bugs |= FF_BUG_EDGE;
2473 if (ctx->divx_version >= 0)
2474 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2478 if (s->codec_id == AV_CODEC_ID_MPEG4 && ctx->xvid_build >= 0 &&
2479 s->avctx->idct_algo == FF_IDCT_AUTO &&
2480 (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
2481 s->avctx->idct_algo = FF_IDCT_XVIDMMX;
2482 ff_dct_common_init(s);
2483 s->picture_number = 0;
2487 if (s->avctx->debug & FF_DEBUG_BUGS)
2488 av_log(s->avctx, AV_LOG_DEBUG,
2489 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2490 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2491 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2493 return decode_vop_header(ctx, gb);
2496 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2498 Mpeg4DecContext *ctx = avctx->priv_data;
2499 MpegEncContext *s = &ctx->m;
2501 /* divx 5.01+ bistream reorder stuff */
2502 if (s->divx_packed) {
2503 int current_pos = get_bits_count(&s->gb) >> 3;
2504 int startcode_found = 0;
2506 if (buf_size - current_pos > 5) {
2508 for (i = current_pos; i < buf_size - 3; i++)
2512 buf[i + 3] == 0xB6) {
2513 startcode_found = 1;
2517 if (s->gb.buffer == s->bitstream_buffer && buf_size > 7 &&
2518 ctx->xvid_build >= 0) { // xvid style
2519 startcode_found = 1;
2523 if (startcode_found) {
2524 av_fast_malloc(&s->bitstream_buffer,
2525 &s->allocated_bitstream_buffer_size,
2526 buf_size - current_pos +
2527 FF_INPUT_BUFFER_PADDING_SIZE);
2528 if (!s->bitstream_buffer)
2529 return AVERROR(ENOMEM);
2530 memcpy(s->bitstream_buffer, buf + current_pos,
2531 buf_size - current_pos);
2532 s->bitstream_buffer_size = buf_size - current_pos;
2539 static int mpeg4_update_thread_context(AVCodecContext *dst,
2540 const AVCodecContext *src)
2542 Mpeg4DecContext *s = dst->priv_data;
2543 const Mpeg4DecContext *s1 = src->priv_data;
2545 int ret = ff_mpeg_update_thread_context(dst, src);
2550 s->shape = s1->shape;
2551 s->time_increment_bits = s1->time_increment_bits;
2556 static av_cold int decode_init(AVCodecContext *avctx)
2558 Mpeg4DecContext *ctx = avctx->priv_data;
2559 MpegEncContext *s = &ctx->m;
2561 static int done = 0;
2566 ctx->lavc_build = -1;
2568 if ((ret = ff_h263_decode_init(avctx)) < 0)
2574 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2575 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2576 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2577 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2578 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2579 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2580 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2581 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2582 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2583 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2584 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2585 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2586 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2587 &ff_sprite_trajectory_tab[0][1], 4, 2,
2588 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2589 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2590 &ff_mb_type_b_tab[0][1], 2, 1,
2591 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2595 s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
2596 s->decode_mb = mpeg4_decode_mb;
2597 ctx->time_increment_bits = 4; /* default value for broken headers */
2599 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2600 avctx->internal->allocate_progress = 1;
2605 static const AVProfile mpeg4_video_profiles[] = {
2606 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2607 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2608 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2609 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2610 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2611 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2612 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2613 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2614 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2615 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2616 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2617 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2618 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2619 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2620 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2621 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2624 AVCodec ff_mpeg4_decoder = {
2626 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2627 .type = AVMEDIA_TYPE_VIDEO,
2628 .id = AV_CODEC_ID_MPEG4,
2629 .priv_data_size = sizeof(Mpeg4DecContext),
2630 .init = decode_init,
2631 .close = ff_h263_decode_end,
2632 .decode = ff_h263_decode_frame,
2633 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2634 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2635 CODEC_CAP_FRAME_THREADS,
2636 .flush = ff_mpeg_flush,
2637 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2638 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2639 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),