3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
39 /* The defines below define the number of bits that are read at once for
40 * reading vlc values. Changing these may improve speed and data cache needs
41 * be aware though that decreasing them may need the number of stages that is
42 * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
45 #define MB_TYPE_B_VLC_BITS 4
47 static VLC dc_lum, dc_chrom;
48 static VLC sprite_trajectory;
49 static VLC mb_type_b_vlc;
51 static const int mb_type_b_map[4] = {
52 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
53 MB_TYPE_L0L1 | MB_TYPE_16x16,
54 MB_TYPE_L1 | MB_TYPE_16x16,
55 MB_TYPE_L0 | MB_TYPE_16x16,
60 * @param n block index (0-3 are luma, 4-5 are chroma)
61 * @param dir the ac prediction direction
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
66 int16_t *ac_val, *ac_val1;
67 int8_t *const qscale_table = s->current_picture.qscale_table;
70 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
74 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
78 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
81 for (i = 1; i < 8; i++)
82 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
84 /* different qscale, we must rescale */
85 for (i = 1; i < 8; i++)
86 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
89 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
91 ac_val -= 16 * s->block_wrap[n];
93 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
96 for (i = 1; i < 8; i++)
97 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
99 /* different qscale, we must rescale */
100 for (i = 1; i < 8; i++)
101 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
106 for (i = 1; i < 8; i++)
107 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
110 for (i = 1; i < 8; i++)
111 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
115 * check if the next stuff is a resync marker or the end.
118 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
120 MpegEncContext *s = &ctx->m;
121 int bits_count = get_bits_count(&s->gb);
122 int v = show_bits(&s->gb, 16);
124 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
128 if (s->pict_type == AV_PICTURE_TYPE_B ||
129 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
131 skip_bits(&s->gb, 8 + s->pict_type);
132 bits_count += 8 + s->pict_type;
133 v = show_bits(&s->gb, 16);
136 if (bits_count + 8 >= s->gb.size_in_bits) {
138 v |= 0x7F >> (7 - (bits_count & 7));
143 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
145 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146 GetBitContext gb = s->gb;
148 skip_bits(&s->gb, 1);
149 align_get_bits(&s->gb);
151 for (len = 0; len < 32; len++)
152 if (get_bits1(&s->gb))
155 mb_num = get_bits(&s->gb, mb_num_bits);
156 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
161 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
170 MpegEncContext *s = &ctx->m;
171 int a = 2 << s->sprite_warping_accuracy;
172 int rho = 3 - s->sprite_warping_accuracy;
178 int min_ab, i, w2, h2, w3, h3;
179 int sprite_ref[4][2];
180 int virtual_ref[2][2];
182 // only true for rectangle shapes
183 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
184 { 0, s->height }, { s->width, s->height } };
185 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
187 if (w <= 0 || h <= 0)
188 return AVERROR_INVALIDDATA;
190 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
194 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
196 x = get_xbits(gb, length);
198 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
199 check_marker(s->avctx, gb, "before sprite_trajectory");
201 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
203 y = get_xbits(gb, length);
205 check_marker(s->avctx, gb, "after sprite_trajectory");
206 ctx->sprite_traj[i][0] = d[i][0] = x;
207 ctx->sprite_traj[i][1] = d[i][1] = y;
210 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
212 while ((1 << alpha) < w)
214 while ((1 << beta) < h)
215 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
219 // Note, the 4th point isn't used for GMC
220 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
221 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
222 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
223 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
224 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
225 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
226 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
228 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
229 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
230 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
231 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
232 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
233 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
235 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
236 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
238 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
239 * because of that...). Perhaps it should be reordered to be more readable.
240 * The idea behind this virtual_ref mess is to be able to use shifts later
241 * per pixel instead of divides so the distance between points is converted
242 * from w&h based to w2&h2 based which are of the 2^x form. */
243 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
244 ROUNDED_DIV(((w - w2) *
245 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
246 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
247 virtual_ref[0][1] = 16 * vop_ref[0][1] +
248 ROUNDED_DIV(((w - w2) *
249 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
250 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
251 virtual_ref[1][0] = 16 * vop_ref[0][0] +
252 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
253 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
254 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
255 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
256 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
258 switch (ctx->num_sprite_warping_points) {
260 s->sprite_offset[0][0] =
261 s->sprite_offset[0][1] =
262 s->sprite_offset[1][0] =
263 s->sprite_offset[1][1] = 0;
264 s->sprite_delta[0][0] = a;
265 s->sprite_delta[0][1] =
266 s->sprite_delta[1][0] = 0;
267 s->sprite_delta[1][1] = a;
268 ctx->sprite_shift[0] =
269 ctx->sprite_shift[1] = 0;
272 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
273 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
274 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
275 a * (vop_ref[0][0] / 2);
276 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
277 a * (vop_ref[0][1] / 2);
278 s->sprite_delta[0][0] = a;
279 s->sprite_delta[0][1] =
280 s->sprite_delta[1][0] = 0;
281 s->sprite_delta[1][1] = a;
282 ctx->sprite_shift[0] =
283 ctx->sprite_shift[1] = 0;
286 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
287 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
290 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
292 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
294 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
296 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
297 (-2 * vop_ref[0][0] + 1) +
298 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
299 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
301 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
302 (-2 * vop_ref[0][0] + 1) +
303 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
305 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
306 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
308 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
309 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
311 ctx->sprite_shift[0] = alpha + rho;
312 ctx->sprite_shift[1] = alpha + rho + 2;
315 min_ab = FFMIN(alpha, beta);
318 s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
319 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
320 h3 * (-vop_ref[0][0]) +
321 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
322 w3 * (-vop_ref[0][1]) +
323 (1 << (alpha + beta + rho - min_ab - 1));
324 s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
325 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
326 h3 * (-vop_ref[0][0]) +
327 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
328 w3 * (-vop_ref[0][1]) +
329 (1 << (alpha + beta + rho - min_ab - 1));
330 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
331 h3 * (-2 * vop_ref[0][0] + 1) +
332 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
333 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
334 r * sprite_ref[0][0] - 16 * w2 * h3 +
335 (1 << (alpha + beta + rho - min_ab + 1));
336 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
337 h3 * (-2 * vop_ref[0][0] + 1) +
338 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
339 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
340 r * sprite_ref[0][1] - 16 * w2 * h3 +
341 (1 << (alpha + beta + rho - min_ab + 1));
342 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
343 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
344 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
345 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
347 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
348 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
351 /* try to simplify the situation */
352 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
353 s->sprite_delta[0][1] == 0 &&
354 s->sprite_delta[1][0] == 0 &&
355 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
356 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
357 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
358 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
359 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
360 s->sprite_delta[0][0] = a;
361 s->sprite_delta[0][1] = 0;
362 s->sprite_delta[1][0] = 0;
363 s->sprite_delta[1][1] = a;
364 ctx->sprite_shift[0] = 0;
365 ctx->sprite_shift[1] = 0;
366 s->real_sprite_warping_points = 1;
368 int shift_y = 16 - ctx->sprite_shift[0];
369 int shift_c = 16 - ctx->sprite_shift[1];
371 if (shift_c < 0 || shift_y < 0 ||
372 FFABS(s->sprite_offset[0][0]) >= INT_MAX >> shift_y ||
373 FFABS(s->sprite_offset[1][0]) >= INT_MAX >> shift_c ||
374 FFABS(s->sprite_offset[0][1]) >= INT_MAX >> shift_y ||
375 FFABS(s->sprite_offset[1][1]) >= INT_MAX >> shift_c
377 avpriv_request_sample(s->avctx, "Too large sprite shift or offset");
378 return AVERROR_PATCHWELCOME;
381 for (i = 0; i < 2; i++) {
382 s->sprite_offset[0][i] *= 1 << shift_y;
383 s->sprite_offset[1][i] *= 1 << shift_c;
384 s->sprite_delta[0][i] *= 1 << shift_y;
385 s->sprite_delta[1][i] *= 1 << shift_y;
386 ctx->sprite_shift[i] = 16;
388 if (llabs(s->sprite_offset[i][0] + s->sprite_delta[i][0] * (int64_t)w) >= INT_MAX ||
389 llabs(s->sprite_offset[i][0] + s->sprite_delta[i][1] * (int64_t)h) >= INT_MAX ||
390 llabs(s->sprite_offset[i][0] + s->sprite_delta[i][0] * (int64_t)w + s->sprite_delta[i][1] * (int64_t)h) >= INT_MAX) {
391 avpriv_request_sample(s->avctx, "Overflow on sprite points");
392 return AVERROR_PATCHWELCOME;
395 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
401 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
402 MpegEncContext *s = &ctx->m;
403 int len = FFMIN(ctx->time_increment_bits + 3, 15);
408 check_marker(s->avctx, gb, "after new_pred");
414 * Decode the next video packet.
415 * @return <0 if something went wrong
417 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
419 MpegEncContext *s = &ctx->m;
421 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
422 int header_extension = 0, mb_num, len;
424 /* is there enough space left for a video packet + header */
425 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
428 for (len = 0; len < 32; len++)
429 if (get_bits1(&s->gb))
432 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
433 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
437 if (ctx->shape != RECT_SHAPE) {
438 header_extension = get_bits1(&s->gb);
439 // FIXME more stuff here
442 mb_num = get_bits(&s->gb, mb_num_bits);
443 if (mb_num >= s->mb_num) {
444 av_log(s->avctx, AV_LOG_ERROR,
445 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
449 s->mb_x = mb_num % s->mb_width;
450 s->mb_y = mb_num / s->mb_width;
452 if (ctx->shape != BIN_ONLY_SHAPE) {
453 int qscale = get_bits(&s->gb, s->quant_precision);
455 s->chroma_qscale = s->qscale = qscale;
458 if (ctx->shape == RECT_SHAPE)
459 header_extension = get_bits1(&s->gb);
461 if (header_extension) {
464 while (get_bits1(&s->gb) != 0)
467 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
468 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
469 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
471 skip_bits(&s->gb, 2); /* vop coding type */
472 // FIXME not rect stuff here
474 if (ctx->shape != BIN_ONLY_SHAPE) {
475 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
476 // FIXME don't just ignore everything
477 if (s->pict_type == AV_PICTURE_TYPE_S &&
478 ctx->vol_sprite_usage == GMC_SPRITE) {
479 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
480 return AVERROR_INVALIDDATA;
481 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
484 // FIXME reduced res stuff here
486 if (s->pict_type != AV_PICTURE_TYPE_I) {
487 int f_code = get_bits(&s->gb, 3); /* fcode_for */
489 av_log(s->avctx, AV_LOG_ERROR,
490 "Error, video packet header damaged (f_code=0)\n");
492 if (s->pict_type == AV_PICTURE_TYPE_B) {
493 int b_code = get_bits(&s->gb, 3);
495 av_log(s->avctx, AV_LOG_ERROR,
496 "Error, video packet header damaged (b_code=0)\n");
501 decode_new_pred(ctx, &s->gb);
507 * Get the average motion vector for a GMC MB.
508 * @param n either 0 for the x component or 1 for y
509 * @return the average MV for a GMC MB
511 static inline int get_amv(Mpeg4DecContext *ctx, int n)
513 MpegEncContext *s = &ctx->m;
514 int x, y, mb_v, sum, dx, dy, shift;
515 int len = 1 << (s->f_code + 4);
516 const int a = s->sprite_warping_accuracy;
518 if (s->workaround_bugs & FF_BUG_AMV)
519 len >>= s->quarter_sample;
521 if (s->real_sprite_warping_points == 1) {
522 if (ctx->divx_version == 500 && ctx->divx_build == 413)
523 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
525 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
527 dx = s->sprite_delta[n][0];
528 dy = s->sprite_delta[n][1];
529 shift = ctx->sprite_shift[0];
531 dy -= 1 << (shift + a + 1);
533 dx -= 1 << (shift + a + 1);
534 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
537 for (y = 0; y < 16; y++) {
542 for (x = 0; x < 16; x++) {
547 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
559 * Decode the dc value.
560 * @param n block index (0-3 are luma, 4-5 are chroma)
561 * @param dir_ptr the prediction direction will be stored here
562 * @return the quantized dc
564 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
569 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
571 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
573 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
574 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
583 level = 2 * get_bits1(&s->gb) - 1;
585 if (get_bits1(&s->gb))
586 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
588 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
591 level = get_xbits(&s->gb, code);
595 if (get_bits1(&s->gb) == 0) { /* marker */
596 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
597 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
604 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
608 * Decode first partition.
609 * @return number of MBs decoded or <0 if an error occurred
611 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
613 MpegEncContext *s = &ctx->m;
615 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
617 /* decode first partition */
618 s->first_slice_line = 1;
619 for (; s->mb_y < s->mb_height; s->mb_y++) {
620 ff_init_block_index(s);
621 for (; s->mb_x < s->mb_width; s->mb_x++) {
622 const int xy = s->mb_x + s->mb_y * s->mb_stride;
627 ff_update_block_index(s);
628 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
629 s->first_slice_line = 0;
631 if (s->pict_type == AV_PICTURE_TYPE_I) {
635 if (show_bits_long(&s->gb, 19) == DC_MARKER)
638 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
640 av_log(s->avctx, AV_LOG_ERROR,
641 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
646 s->cbp_table[xy] = cbpc & 3;
647 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
651 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
653 s->current_picture.qscale_table[xy] = s->qscale;
655 s->mbintra_table[xy] = 1;
656 for (i = 0; i < 6; i++) {
658 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
660 av_log(s->avctx, AV_LOG_ERROR,
661 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
668 s->pred_dir_table[xy] = dir;
669 } else { /* P/S_TYPE */
670 int mx, my, pred_x, pred_y, bits;
671 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
672 const int stride = s->b8_stride * 2;
675 bits = show_bits(&s->gb, 17);
676 if (bits == MOTION_MARKER)
680 if (bits & 0x10000) {
682 if (s->pict_type == AV_PICTURE_TYPE_S &&
683 ctx->vol_sprite_usage == GMC_SPRITE) {
684 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
688 mx = get_amv(ctx, 0);
689 my = get_amv(ctx, 1);
691 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
698 mot_val[0 + stride] =
699 mot_val[2 + stride] = mx;
702 mot_val[1 + stride] =
703 mot_val[3 + stride] = my;
705 if (s->mbintra_table[xy])
706 ff_clean_intra_table_entries(s);
710 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
712 av_log(s->avctx, AV_LOG_ERROR,
713 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
719 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
721 s->mb_intra = ((cbpc & 4) != 0);
724 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
725 s->mbintra_table[xy] = 1;
728 mot_val[0 + stride] =
729 mot_val[2 + stride] = 0;
732 mot_val[1 + stride] =
733 mot_val[3 + stride] = 0;
735 if (s->mbintra_table[xy])
736 ff_clean_intra_table_entries(s);
738 if (s->pict_type == AV_PICTURE_TYPE_S &&
739 ctx->vol_sprite_usage == GMC_SPRITE &&
741 s->mcsel = get_bits1(&s->gb);
745 if ((cbpc & 16) == 0) {
746 /* 16x16 motion prediction */
748 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
750 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
754 my = ff_h263_decode_motion(s, pred_y, s->f_code);
757 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
760 mx = get_amv(ctx, 0);
761 my = get_amv(ctx, 1);
762 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
769 mot_val[0 + stride] =
770 mot_val[2 + stride] = mx;
773 mot_val[1 + stride] =
774 mot_val[3 + stride] = my;
777 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
779 for (i = 0; i < 4; i++) {
780 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
781 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
785 my = ff_h263_decode_motion(s, pred_y, s->f_code);
802 * decode second partition.
803 * @return <0 if an error occurred
805 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
808 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
810 s->mb_x = s->resync_mb_x;
811 s->first_slice_line = 1;
812 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
813 ff_init_block_index(s);
814 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
815 const int xy = s->mb_x + s->mb_y * s->mb_stride;
818 ff_update_block_index(s);
819 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
820 s->first_slice_line = 0;
822 if (s->pict_type == AV_PICTURE_TYPE_I) {
823 int ac_pred = get_bits1(&s->gb);
824 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
826 av_log(s->avctx, AV_LOG_ERROR,
827 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
831 s->cbp_table[xy] |= cbpy << 2;
832 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
833 } else { /* P || S_TYPE */
834 if (IS_INTRA(s->current_picture.mb_type[xy])) {
837 int ac_pred = get_bits1(&s->gb);
838 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
841 av_log(s->avctx, AV_LOG_ERROR,
842 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
846 if (s->cbp_table[xy] & 8)
847 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
848 s->current_picture.qscale_table[xy] = s->qscale;
850 for (i = 0; i < 6; i++) {
852 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
854 av_log(s->avctx, AV_LOG_ERROR,
855 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
862 s->cbp_table[xy] &= 3; // remove dquant
863 s->cbp_table[xy] |= cbpy << 2;
864 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
865 s->pred_dir_table[xy] = dir;
866 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
867 s->current_picture.qscale_table[xy] = s->qscale;
868 s->cbp_table[xy] = 0;
870 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
873 av_log(s->avctx, AV_LOG_ERROR,
874 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
878 if (s->cbp_table[xy] & 8)
879 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
880 s->current_picture.qscale_table[xy] = s->qscale;
882 s->cbp_table[xy] &= 3; // remove dquant
883 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
887 if (mb_num >= mb_count)
895 * Decode the first and second partition.
896 * @return <0 if error (and sets error type in the error_status_table)
898 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
900 MpegEncContext *s = &ctx->m;
902 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
903 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
905 mb_num = mpeg4_decode_partition_a(ctx);
907 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
908 s->mb_x, s->mb_y, part_a_error);
912 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
913 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
914 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
915 s->mb_x, s->mb_y, part_a_error);
919 s->mb_num_left = mb_num;
921 if (s->pict_type == AV_PICTURE_TYPE_I) {
922 while (show_bits(&s->gb, 9) == 1)
923 skip_bits(&s->gb, 9);
924 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
925 av_log(s->avctx, AV_LOG_ERROR,
926 "marker missing after first I partition at %d %d\n",
931 while (show_bits(&s->gb, 10) == 1)
932 skip_bits(&s->gb, 10);
933 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
934 av_log(s->avctx, AV_LOG_ERROR,
935 "marker missing after first P partition at %d %d\n",
940 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
941 s->mb_x - 1, s->mb_y, part_a_end);
943 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
944 if (s->pict_type == AV_PICTURE_TYPE_P)
945 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
946 s->mb_x, s->mb_y, ER_DC_ERROR);
949 if (s->pict_type == AV_PICTURE_TYPE_P)
950 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
951 s->mb_x - 1, s->mb_y, ER_DC_END);
959 * @return <0 if an error occurred
961 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
962 int n, int coded, int intra, int rvlc)
964 MpegEncContext *s = &ctx->m;
965 int level, i, last, run, qmul, qadd;
966 int av_uninit(dc_pred_dir);
969 const uint8_t *scan_table;
971 // Note intra & rvlc should be optimized away if this is inlined
974 if (ctx->use_intra_dc_vlc) {
976 if (s->partitioned_frame) {
977 level = s->dc_val[0][s->block_index[n]];
979 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
981 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
982 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
984 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
992 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
998 rl = &ff_rvlc_rl_intra;
999 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1001 rl = &ff_mpeg4_rl_intra;
1002 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1005 if (dc_pred_dir == 0)
1006 scan_table = s->intra_v_scantable.permutated; /* left */
1008 scan_table = s->intra_h_scantable.permutated; /* top */
1010 scan_table = s->intra_scantable.permutated;
1017 s->block_last_index[n] = i;
1021 rl = &ff_rvlc_rl_inter;
1023 rl = &ff_h263_rl_inter;
1025 scan_table = s->intra_scantable.permutated;
1027 if (s->mpeg_quant) {
1031 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1033 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1035 qmul = s->qscale << 1;
1036 qadd = (s->qscale - 1) | 1;
1038 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1040 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1044 OPEN_READER(re, &s->gb);
1046 UPDATE_CACHE(re, &s->gb);
1047 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1051 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1052 av_log(s->avctx, AV_LOG_ERROR,
1053 "1. marker bit missing in rvlc esc\n");
1056 SKIP_CACHE(re, &s->gb, 1);
1058 last = SHOW_UBITS(re, &s->gb, 1);
1059 SKIP_CACHE(re, &s->gb, 1);
1060 run = SHOW_UBITS(re, &s->gb, 6);
1061 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1062 UPDATE_CACHE(re, &s->gb);
1064 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1065 av_log(s->avctx, AV_LOG_ERROR,
1066 "2. marker bit missing in rvlc esc\n");
1069 SKIP_CACHE(re, &s->gb, 1);
1071 level = SHOW_UBITS(re, &s->gb, 11);
1072 SKIP_CACHE(re, &s->gb, 11);
1074 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1075 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1078 SKIP_CACHE(re, &s->gb, 5);
1080 level = level * qmul + qadd;
1081 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1082 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1089 cache = GET_CACHE(re, &s->gb);
1092 cache ^= 0xC0000000;
1094 if (cache & 0x80000000) {
1095 if (cache & 0x40000000) {
1097 SKIP_CACHE(re, &s->gb, 2);
1098 last = SHOW_UBITS(re, &s->gb, 1);
1099 SKIP_CACHE(re, &s->gb, 1);
1100 run = SHOW_UBITS(re, &s->gb, 6);
1101 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1102 UPDATE_CACHE(re, &s->gb);
1105 level = SHOW_SBITS(re, &s->gb, 12);
1106 LAST_SKIP_BITS(re, &s->gb, 12);
1108 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1109 av_log(s->avctx, AV_LOG_ERROR,
1110 "1. marker bit missing in 3. esc\n");
1111 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1114 SKIP_CACHE(re, &s->gb, 1);
1116 level = SHOW_SBITS(re, &s->gb, 12);
1117 SKIP_CACHE(re, &s->gb, 12);
1119 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1120 av_log(s->avctx, AV_LOG_ERROR,
1121 "2. marker bit missing in 3. esc\n");
1122 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1126 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1130 if (s->error_recognition >= FF_ER_COMPLIANT) {
1131 const int abs_level= FFABS(level);
1132 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1133 const int run1= run - rl->max_run[last][abs_level] - 1;
1134 if (abs_level <= rl->max_level[last][run]) {
1135 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1138 if (s->error_recognition > FF_ER_COMPLIANT) {
1139 if (abs_level <= rl->max_level[last][run]*2) {
1140 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1143 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1144 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1152 level = level * qmul + qadd;
1154 level = level * qmul - qadd;
1156 if ((unsigned)(level + 2048) > 4095) {
1157 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1158 if (level > 2560 || level < -2560) {
1159 av_log(s->avctx, AV_LOG_ERROR,
1160 "|level| overflow in 3. esc, qp=%d\n",
1165 level = level < 0 ? -2048 : 2047;
1173 SKIP_BITS(re, &s->gb, 2);
1174 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1175 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1176 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1177 LAST_SKIP_BITS(re, &s->gb, 1);
1181 SKIP_BITS(re, &s->gb, 1);
1182 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1184 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1185 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1186 LAST_SKIP_BITS(re, &s->gb, 1);
1191 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1192 LAST_SKIP_BITS(re, &s->gb, 1);
1194 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1198 av_log(s->avctx, AV_LOG_ERROR,
1199 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1203 block[scan_table[i]] = level;
1207 block[scan_table[i]] = level;
1209 CLOSE_READER(re, &s->gb);
1214 if (!ctx->use_intra_dc_vlc) {
1215 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1217 i -= i >> 31; // if (i == -1) i = 0;
1220 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1222 i = 63; // FIXME not optimal
1224 s->block_last_index[n] = i;
1229 * decode partition C of one MB.
1230 * @return <0 if an error occurred
1232 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1234 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1236 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1238 mb_type = s->current_picture.mb_type[xy];
1239 cbp = s->cbp_table[xy];
1241 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1243 if (s->current_picture.qscale_table[xy] != s->qscale)
1244 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1246 if (s->pict_type == AV_PICTURE_TYPE_P ||
1247 s->pict_type == AV_PICTURE_TYPE_S) {
1249 for (i = 0; i < 4; i++) {
1250 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1251 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1253 s->mb_intra = IS_INTRA(mb_type);
1255 if (IS_SKIP(mb_type)) {
1257 for (i = 0; i < 6; i++)
1258 s->block_last_index[i] = -1;
1259 s->mv_dir = MV_DIR_FORWARD;
1260 s->mv_type = MV_TYPE_16X16;
1261 if (s->pict_type == AV_PICTURE_TYPE_S
1262 && ctx->vol_sprite_usage == GMC_SPRITE) {
1269 } else if (s->mb_intra) {
1270 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1271 } else if (!s->mb_intra) {
1272 // s->mcsel = 0; // FIXME do we need to init that?
1274 s->mv_dir = MV_DIR_FORWARD;
1275 if (IS_8X8(mb_type)) {
1276 s->mv_type = MV_TYPE_8X8;
1278 s->mv_type = MV_TYPE_16X16;
1281 } else { /* I-Frame */
1283 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1286 if (!IS_SKIP(mb_type)) {
1288 s->bdsp.clear_blocks(s->block[0]);
1289 /* decode each block */
1290 for (i = 0; i < 6; i++) {
1291 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1292 av_log(s->avctx, AV_LOG_ERROR,
1293 "texture corrupted at %d %d %d\n",
1294 s->mb_x, s->mb_y, s->mb_intra);
1301 /* per-MB end of slice check */
1302 if (--s->mb_num_left <= 0) {
1303 if (mpeg4_is_resync(ctx))
1308 if (mpeg4_is_resync(ctx)) {
1309 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1310 if (s->cbp_table[xy + delta])
1317 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1319 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1320 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1322 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1323 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1325 av_assert2(s->h263_pred);
1327 if (s->pict_type == AV_PICTURE_TYPE_P ||
1328 s->pict_type == AV_PICTURE_TYPE_S) {
1330 if (get_bits1(&s->gb)) {
1333 for (i = 0; i < 6; i++)
1334 s->block_last_index[i] = -1;
1335 s->mv_dir = MV_DIR_FORWARD;
1336 s->mv_type = MV_TYPE_16X16;
1337 if (s->pict_type == AV_PICTURE_TYPE_S &&
1338 ctx->vol_sprite_usage == GMC_SPRITE) {
1339 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1344 s->mv[0][0][0] = get_amv(ctx, 0);
1345 s->mv[0][0][1] = get_amv(ctx, 1);
1348 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1358 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1360 av_log(s->avctx, AV_LOG_ERROR,
1361 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1364 } while (cbpc == 20);
1366 s->bdsp.clear_blocks(s->block[0]);
1368 s->mb_intra = ((cbpc & 4) != 0);
1372 if (s->pict_type == AV_PICTURE_TYPE_S &&
1373 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1374 s->mcsel = get_bits1(&s->gb);
1377 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1379 av_log(s->avctx, AV_LOG_ERROR,
1380 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1381 return AVERROR_INVALIDDATA;
1384 cbp = (cbpc & 3) | (cbpy << 2);
1386 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1387 if ((!s->progressive_sequence) &&
1388 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1389 s->interlaced_dct = get_bits1(&s->gb);
1391 s->mv_dir = MV_DIR_FORWARD;
1392 if ((cbpc & 16) == 0) {
1394 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1397 /* 16x16 global motion prediction */
1398 s->mv_type = MV_TYPE_16X16;
1399 mx = get_amv(ctx, 0);
1400 my = get_amv(ctx, 1);
1401 s->mv[0][0][0] = mx;
1402 s->mv[0][0][1] = my;
1403 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1404 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1407 /* 16x8 field motion prediction */
1408 s->mv_type = MV_TYPE_FIELD;
1410 s->field_select[0][0] = get_bits1(&s->gb);
1411 s->field_select[0][1] = get_bits1(&s->gb);
1413 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1415 for (i = 0; i < 2; i++) {
1416 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1420 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1424 s->mv[0][i][0] = mx;
1425 s->mv[0][i][1] = my;
1428 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1429 /* 16x16 motion prediction */
1430 s->mv_type = MV_TYPE_16X16;
1431 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1432 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1437 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1441 s->mv[0][0][0] = mx;
1442 s->mv[0][0][1] = my;
1445 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1446 s->mv_type = MV_TYPE_8X8;
1447 for (i = 0; i < 4; i++) {
1448 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1449 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1453 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1456 s->mv[0][i][0] = mx;
1457 s->mv[0][i][1] = my;
1462 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1463 int modb1; // first bit of modb
1464 int modb2; // second bit of modb
1467 s->mb_intra = 0; // B-frames never contain intra blocks
1468 s->mcsel = 0; // ... true gmc blocks
1471 for (i = 0; i < 2; i++) {
1472 s->last_mv[i][0][0] =
1473 s->last_mv[i][0][1] =
1474 s->last_mv[i][1][0] =
1475 s->last_mv[i][1][1] = 0;
1478 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1481 /* if we skipped it in the future P-frame than skip it now too */
1482 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1484 if (s->mb_skipped) {
1486 for (i = 0; i < 6; i++)
1487 s->block_last_index[i] = -1;
1489 s->mv_dir = MV_DIR_FORWARD;
1490 s->mv_type = MV_TYPE_16X16;
1495 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1501 modb1 = get_bits1(&s->gb);
1503 // like MB_TYPE_B_DIRECT but no vectors coded
1504 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1507 modb2 = get_bits1(&s->gb);
1508 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1510 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1513 mb_type = mb_type_b_map[mb_type];
1517 s->bdsp.clear_blocks(s->block[0]);
1518 cbp = get_bits(&s->gb, 6);
1521 if ((!IS_DIRECT(mb_type)) && cbp) {
1522 if (get_bits1(&s->gb))
1523 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1526 if (!s->progressive_sequence) {
1528 s->interlaced_dct = get_bits1(&s->gb);
1530 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1531 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1532 mb_type &= ~MB_TYPE_16x16;
1534 if (USES_LIST(mb_type, 0)) {
1535 s->field_select[0][0] = get_bits1(&s->gb);
1536 s->field_select[0][1] = get_bits1(&s->gb);
1538 if (USES_LIST(mb_type, 1)) {
1539 s->field_select[1][0] = get_bits1(&s->gb);
1540 s->field_select[1][1] = get_bits1(&s->gb);
1546 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1547 s->mv_type = MV_TYPE_16X16;
1549 if (USES_LIST(mb_type, 0)) {
1550 s->mv_dir = MV_DIR_FORWARD;
1552 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1553 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1554 s->last_mv[0][1][0] =
1555 s->last_mv[0][0][0] =
1556 s->mv[0][0][0] = mx;
1557 s->last_mv[0][1][1] =
1558 s->last_mv[0][0][1] =
1559 s->mv[0][0][1] = my;
1562 if (USES_LIST(mb_type, 1)) {
1563 s->mv_dir |= MV_DIR_BACKWARD;
1565 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1566 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1567 s->last_mv[1][1][0] =
1568 s->last_mv[1][0][0] =
1569 s->mv[1][0][0] = mx;
1570 s->last_mv[1][1][1] =
1571 s->last_mv[1][0][1] =
1572 s->mv[1][0][1] = my;
1574 } else if (!IS_DIRECT(mb_type)) {
1575 s->mv_type = MV_TYPE_FIELD;
1577 if (USES_LIST(mb_type, 0)) {
1578 s->mv_dir = MV_DIR_FORWARD;
1580 for (i = 0; i < 2; i++) {
1581 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1582 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1583 s->last_mv[0][i][0] =
1584 s->mv[0][i][0] = mx;
1585 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1589 if (USES_LIST(mb_type, 1)) {
1590 s->mv_dir |= MV_DIR_BACKWARD;
1592 for (i = 0; i < 2; i++) {
1593 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1594 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1595 s->last_mv[1][i][0] =
1596 s->mv[1][i][0] = mx;
1597 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1603 if (IS_DIRECT(mb_type)) {
1604 if (IS_SKIP(mb_type)) {
1608 mx = ff_h263_decode_motion(s, 0, 1);
1609 my = ff_h263_decode_motion(s, 0, 1);
1612 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1613 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1615 s->current_picture.mb_type[xy] = mb_type;
1616 } else { /* I-Frame */
1618 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1620 av_log(s->avctx, AV_LOG_ERROR,
1621 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1624 } while (cbpc == 8);
1630 s->ac_pred = get_bits1(&s->gb);
1632 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1634 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1636 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1638 av_log(s->avctx, AV_LOG_ERROR,
1639 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1642 cbp = (cbpc & 3) | (cbpy << 2);
1644 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1647 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1649 if (!s->progressive_sequence)
1650 s->interlaced_dct = get_bits1(&s->gb);
1652 s->bdsp.clear_blocks(s->block[0]);
1653 /* decode each block */
1654 for (i = 0; i < 6; i++) {
1655 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1662 /* decode each block */
1663 for (i = 0; i < 6; i++) {
1664 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1670 /* per-MB end of slice check */
1671 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1672 int next = mpeg4_is_resync(ctx);
1674 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1676 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1679 if (s->pict_type == AV_PICTURE_TYPE_B) {
1680 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1681 ff_thread_await_progress(&s->next_picture_ptr->tf,
1682 (s->mb_x + delta >= s->mb_width)
1683 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1685 if (s->next_picture.mbskip_table[xy + delta])
1696 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1698 int hours, minutes, seconds;
1700 if (!show_bits(gb, 23)) {
1701 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1705 hours = get_bits(gb, 5);
1706 minutes = get_bits(gb, 6);
1707 check_marker(s->avctx, gb, "in gop_header");
1708 seconds = get_bits(gb, 6);
1710 s->time_base = seconds + 60*(minutes + 60*hours);
1718 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1721 s->avctx->profile = get_bits(gb, 4);
1722 s->avctx->level = get_bits(gb, 4);
1724 // for Simple profile, level 0
1725 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1726 s->avctx->level = 0;
1732 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1734 MpegEncContext *s = &ctx->m;
1735 int width, height, vo_ver_id;
1738 skip_bits(gb, 1); /* random access */
1739 s->vo_type = get_bits(gb, 8);
1740 if (get_bits1(gb) != 0) { /* is_ol_id */
1741 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1742 skip_bits(gb, 3); /* vo_priority */
1746 s->aspect_ratio_info = get_bits(gb, 4);
1747 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1748 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1749 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1751 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1754 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1755 int chroma_format = get_bits(gb, 2);
1756 if (chroma_format != CHROMA_420)
1757 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1759 s->low_delay = get_bits1(gb);
1760 if (get_bits1(gb)) { /* vbv parameters */
1761 get_bits(gb, 15); /* first_half_bitrate */
1762 check_marker(s->avctx, gb, "after first_half_bitrate");
1763 get_bits(gb, 15); /* latter_half_bitrate */
1764 check_marker(s->avctx, gb, "after latter_half_bitrate");
1765 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1766 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1767 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1768 get_bits(gb, 11); /* first_half_vbv_occupancy */
1769 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1770 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1771 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1774 /* is setting low delay flag only once the smartest thing to do?
1775 * low delay detection will not be overridden. */
1776 if (s->picture_number == 0) {
1777 switch(s->vo_type) {
1778 case SIMPLE_VO_TYPE:
1779 case ADV_SIMPLE_VO_TYPE:
1788 ctx->shape = get_bits(gb, 2); /* vol shape */
1789 if (ctx->shape != RECT_SHAPE)
1790 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1791 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1792 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1793 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1796 check_marker(s->avctx, gb, "before time_increment_resolution");
1798 s->avctx->framerate.num = get_bits(gb, 16);
1799 if (!s->avctx->framerate.num) {
1800 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1801 return AVERROR_INVALIDDATA;
1804 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1805 if (ctx->time_increment_bits < 1)
1806 ctx->time_increment_bits = 1;
1808 check_marker(s->avctx, gb, "before fixed_vop_rate");
1810 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1811 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1813 s->avctx->framerate.den = 1;
1815 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1819 if (ctx->shape != BIN_ONLY_SHAPE) {
1820 if (ctx->shape == RECT_SHAPE) {
1821 check_marker(s->avctx, gb, "before width");
1822 width = get_bits(gb, 13);
1823 check_marker(s->avctx, gb, "before height");
1824 height = get_bits(gb, 13);
1825 check_marker(s->avctx, gb, "after height");
1826 if (width && height && /* they should be non zero but who knows */
1827 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1828 if (s->width && s->height &&
1829 (s->width != width || s->height != height))
1830 s->context_reinit = 1;
1836 s->progressive_sequence =
1837 s->progressive_frame = get_bits1(gb) ^ 1;
1838 s->interlaced_dct = 0;
1839 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1840 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1841 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1843 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1845 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1847 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1848 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1849 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1850 ctx->vol_sprite_usage == GMC_SPRITE) {
1851 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1852 skip_bits(gb, 13); // sprite_width
1853 check_marker(s->avctx, gb, "after sprite_width");
1854 skip_bits(gb, 13); // sprite_height
1855 check_marker(s->avctx, gb, "after sprite_height");
1856 skip_bits(gb, 13); // sprite_left
1857 check_marker(s->avctx, gb, "after sprite_left");
1858 skip_bits(gb, 13); // sprite_top
1859 check_marker(s->avctx, gb, "after sprite_top");
1861 ctx->num_sprite_warping_points = get_bits(gb, 6);
1862 if (ctx->num_sprite_warping_points > 3) {
1863 av_log(s->avctx, AV_LOG_ERROR,
1864 "%d sprite_warping_points\n",
1865 ctx->num_sprite_warping_points);
1866 ctx->num_sprite_warping_points = 0;
1867 return AVERROR_INVALIDDATA;
1869 s->sprite_warping_accuracy = get_bits(gb, 2);
1870 ctx->sprite_brightness_change = get_bits1(gb);
1871 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1872 skip_bits1(gb); // low_latency_sprite
1874 // FIXME sadct disable bit if verid!=1 && shape not rect
1876 if (get_bits1(gb) == 1) { /* not_8_bit */
1877 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1878 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1879 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1880 if (s->quant_precision != 5)
1881 av_log(s->avctx, AV_LOG_ERROR,
1882 "quant precision %d\n", s->quant_precision);
1883 if (s->quant_precision<3 || s->quant_precision>9) {
1884 s->quant_precision = 5;
1887 s->quant_precision = 5;
1890 // FIXME a bunch of grayscale shape things
1892 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1895 /* load default matrixes */
1896 for (i = 0; i < 64; i++) {
1897 int j = s->idsp.idct_permutation[i];
1898 v = ff_mpeg4_default_intra_matrix[i];
1899 s->intra_matrix[j] = v;
1900 s->chroma_intra_matrix[j] = v;
1902 v = ff_mpeg4_default_non_intra_matrix[i];
1903 s->inter_matrix[j] = v;
1904 s->chroma_inter_matrix[j] = v;
1907 /* load custom intra matrix */
1908 if (get_bits1(gb)) {
1910 for (i = 0; i < 64; i++) {
1912 if (get_bits_left(gb) < 8) {
1913 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1914 return AVERROR_INVALIDDATA;
1916 v = get_bits(gb, 8);
1921 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1922 s->intra_matrix[j] = last;
1923 s->chroma_intra_matrix[j] = last;
1926 /* replicate last value */
1927 for (; i < 64; i++) {
1928 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1929 s->intra_matrix[j] = last;
1930 s->chroma_intra_matrix[j] = last;
1934 /* load custom non intra matrix */
1935 if (get_bits1(gb)) {
1937 for (i = 0; i < 64; i++) {
1939 if (get_bits_left(gb) < 8) {
1940 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1941 return AVERROR_INVALIDDATA;
1943 v = get_bits(gb, 8);
1948 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1949 s->inter_matrix[j] = v;
1950 s->chroma_inter_matrix[j] = v;
1953 /* replicate last value */
1954 for (; i < 64; i++) {
1955 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1956 s->inter_matrix[j] = last;
1957 s->chroma_inter_matrix[j] = last;
1961 // FIXME a bunch of grayscale shape things
1965 s->quarter_sample = get_bits1(gb);
1967 s->quarter_sample = 0;
1969 if (get_bits_left(gb) < 4) {
1970 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1971 return AVERROR_INVALIDDATA;
1974 if (!get_bits1(gb)) {
1975 int pos = get_bits_count(gb);
1976 int estimation_method = get_bits(gb, 2);
1977 if (estimation_method < 2) {
1978 if (!get_bits1(gb)) {
1979 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1980 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1981 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1982 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1983 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1984 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
1986 if (!get_bits1(gb)) {
1987 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1988 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1989 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1990 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1992 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
1993 skip_bits_long(gb, pos - get_bits_count(gb));
1996 if (!get_bits1(gb)) {
1997 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1998 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1999 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2000 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2002 if (!get_bits1(gb)) {
2003 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2004 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2005 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2006 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2007 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2008 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2010 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2011 skip_bits_long(gb, pos - get_bits_count(gb));
2014 if (estimation_method == 1) {
2015 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2016 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2019 av_log(s->avctx, AV_LOG_ERROR,
2020 "Invalid Complexity estimation method %d\n",
2025 ctx->cplx_estimation_trash_i =
2026 ctx->cplx_estimation_trash_p =
2027 ctx->cplx_estimation_trash_b = 0;
2030 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2032 s->data_partitioning = get_bits1(gb);
2033 if (s->data_partitioning)
2034 ctx->rvlc = get_bits1(gb);
2036 if (vo_ver_id != 1) {
2037 ctx->new_pred = get_bits1(gb);
2038 if (ctx->new_pred) {
2039 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2040 skip_bits(gb, 2); /* requested upstream message type */
2041 skip_bits1(gb); /* newpred segment type */
2043 if (get_bits1(gb)) // reduced_res_vop
2044 av_log(s->avctx, AV_LOG_ERROR,
2045 "reduced resolution VOP not supported\n");
2050 ctx->scalability = get_bits1(gb);
2052 if (ctx->scalability) {
2053 GetBitContext bak = *gb;
2054 int h_sampling_factor_n;
2055 int h_sampling_factor_m;
2056 int v_sampling_factor_n;
2057 int v_sampling_factor_m;
2059 skip_bits1(gb); // hierarchy_type
2060 skip_bits(gb, 4); /* ref_layer_id */
2061 skip_bits1(gb); /* ref_layer_sampling_dir */
2062 h_sampling_factor_n = get_bits(gb, 5);
2063 h_sampling_factor_m = get_bits(gb, 5);
2064 v_sampling_factor_n = get_bits(gb, 5);
2065 v_sampling_factor_m = get_bits(gb, 5);
2066 ctx->enhancement_type = get_bits1(gb);
2068 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2069 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2070 /* illegal scalability header (VERY broken encoder),
2071 * trying to workaround */
2072 ctx->scalability = 0;
2075 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2077 // bin shape stuff FIXME
2081 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2082 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2083 s->avctx->framerate.den, s->avctx->framerate.num,
2084 ctx->time_increment_bits,
2086 s->progressive_sequence,
2088 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2089 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2097 * Decode the user data stuff in the header.
2098 * Also initializes divx/xvid/lavc_version/build.
2100 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2102 MpegEncContext *s = &ctx->m;
2106 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2109 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2110 if (show_bits(gb, 23) == 0)
2112 buf[i] = get_bits(gb, 8);
2116 /* divx detection */
2117 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2119 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2121 ctx->divx_version = ver;
2122 ctx->divx_build = build;
2123 s->divx_packed = e == 3 && last == 'p';
2126 /* libavcodec detection */
2127 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2129 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2131 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2133 build = (ver << 16) + (ver2 << 8) + ver3;
2136 if (strcmp(buf, "ffmpeg") == 0)
2137 ctx->lavc_build = 4600;
2140 ctx->lavc_build = build;
2142 /* Xvid detection */
2143 e = sscanf(buf, "XviD%d", &build);
2145 ctx->xvid_build = build;
2150 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2152 Mpeg4DecContext *ctx = avctx->priv_data;
2153 MpegEncContext *s = &ctx->m;
2155 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2156 if (s->codec_tag == AV_RL32("XVID") ||
2157 s->codec_tag == AV_RL32("XVIX") ||
2158 s->codec_tag == AV_RL32("RMP4") ||
2159 s->codec_tag == AV_RL32("ZMP4") ||
2160 s->codec_tag == AV_RL32("SIPP"))
2161 ctx->xvid_build = 0;
2164 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2165 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2166 ctx->vol_control_parameters == 0)
2167 ctx->divx_version = 400; // divx 4
2169 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2171 ctx->divx_build = -1;
2174 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2175 if (s->codec_tag == AV_RL32("XVIX"))
2176 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2178 if (s->codec_tag == AV_RL32("UMP4"))
2179 s->workaround_bugs |= FF_BUG_UMP4;
2181 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2182 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2184 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2185 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2187 if (ctx->xvid_build <= 3U)
2188 s->padding_bug_score = 256 * 256 * 256 * 64;
2190 if (ctx->xvid_build <= 1U)
2191 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2193 if (ctx->xvid_build <= 12U)
2194 s->workaround_bugs |= FF_BUG_EDGE;
2196 if (ctx->xvid_build <= 32U)
2197 s->workaround_bugs |= FF_BUG_DC_CLIP;
2199 #define SET_QPEL_FUNC(postfix1, postfix2) \
2200 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2201 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2202 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2204 if (ctx->lavc_build < 4653U)
2205 s->workaround_bugs |= FF_BUG_STD_QPEL;
2207 if (ctx->lavc_build < 4655U)
2208 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2210 if (ctx->lavc_build < 4670U)
2211 s->workaround_bugs |= FF_BUG_EDGE;
2213 if (ctx->lavc_build <= 4712U)
2214 s->workaround_bugs |= FF_BUG_DC_CLIP;
2216 if ((ctx->lavc_build&0xFF) >= 100) {
2217 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2218 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2220 s->workaround_bugs |= FF_BUG_IEDGE;
2223 if (ctx->divx_version >= 0)
2224 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2225 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2226 s->padding_bug_score = 256 * 256 * 256 * 64;
2228 if (ctx->divx_version < 500U)
2229 s->workaround_bugs |= FF_BUG_EDGE;
2231 if (ctx->divx_version >= 0)
2232 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2235 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2236 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2237 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2238 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2239 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2240 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2241 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2243 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2244 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2245 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2246 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2247 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2248 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2251 if (avctx->debug & FF_DEBUG_BUGS)
2252 av_log(s->avctx, AV_LOG_DEBUG,
2253 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2254 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2255 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2257 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2258 s->codec_id == AV_CODEC_ID_MPEG4 &&
2259 avctx->idct_algo == FF_IDCT_AUTO) {
2260 avctx->idct_algo = FF_IDCT_XVID;
2261 ff_mpv_idct_init(s);
2268 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2270 MpegEncContext *s = &ctx->m;
2271 int time_incr, time_increment;
2274 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2275 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2276 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2277 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2281 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2282 if (s->partitioned_frame)
2283 s->decode_mb = mpeg4_decode_partitioned_mb;
2285 s->decode_mb = mpeg4_decode_mb;
2288 while (get_bits1(gb) != 0)
2291 check_marker(s->avctx, gb, "before time_increment");
2293 if (ctx->time_increment_bits == 0 ||
2294 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2295 av_log(s->avctx, AV_LOG_WARNING,
2296 "time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
2298 for (ctx->time_increment_bits = 1;
2299 ctx->time_increment_bits < 16;
2300 ctx->time_increment_bits++) {
2301 if (s->pict_type == AV_PICTURE_TYPE_P ||
2302 (s->pict_type == AV_PICTURE_TYPE_S &&
2303 ctx->vol_sprite_usage == GMC_SPRITE)) {
2304 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2306 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2310 av_log(s->avctx, AV_LOG_WARNING,
2311 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2312 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2313 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2314 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2319 time_increment = get_bits1(gb); // FIXME investigate further
2321 time_increment = get_bits(gb, ctx->time_increment_bits);
2323 if (s->pict_type != AV_PICTURE_TYPE_B) {
2324 s->last_time_base = s->time_base;
2325 s->time_base += time_incr;
2326 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2327 if (s->workaround_bugs & FF_BUG_UMP4) {
2328 if (s->time < s->last_non_b_time) {
2329 /* header is not mpeg-4-compatible, broken encoder,
2330 * trying to workaround */
2332 s->time += s->avctx->framerate.num;
2335 s->pp_time = s->time - s->last_non_b_time;
2336 s->last_non_b_time = s->time;
2338 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2339 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2340 if (s->pp_time <= s->pb_time ||
2341 s->pp_time <= s->pp_time - s->pb_time ||
2343 /* messed up order, maybe after seeking? skipping current B-frame */
2344 return FRAME_SKIPPED;
2346 ff_mpeg4_init_direct_mv(s);
2348 if (ctx->t_frame == 0)
2349 ctx->t_frame = s->pb_time;
2350 if (ctx->t_frame == 0)
2351 ctx->t_frame = 1; // 1/0 protection
2352 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2353 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2354 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2355 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2356 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2357 s->pb_field_time = 2;
2358 s->pp_field_time = 4;
2359 if (!s->progressive_sequence)
2360 return FRAME_SKIPPED;
2364 if (s->avctx->framerate.den)
2365 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2367 pts = AV_NOPTS_VALUE;
2368 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2370 check_marker(s->avctx, gb, "before vop_coded");
2373 if (get_bits1(gb) != 1) {
2374 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2375 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2376 return FRAME_SKIPPED;
2379 decode_new_pred(ctx, gb);
2381 if (ctx->shape != BIN_ONLY_SHAPE &&
2382 (s->pict_type == AV_PICTURE_TYPE_P ||
2383 (s->pict_type == AV_PICTURE_TYPE_S &&
2384 ctx->vol_sprite_usage == GMC_SPRITE))) {
2385 /* rounding type for motion estimation */
2386 s->no_rounding = get_bits1(gb);
2390 // FIXME reduced res stuff
2392 if (ctx->shape != RECT_SHAPE) {
2393 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2394 skip_bits(gb, 13); /* width */
2395 check_marker(s->avctx, gb, "after width");
2396 skip_bits(gb, 13); /* height */
2397 check_marker(s->avctx, gb, "after height");
2398 skip_bits(gb, 13); /* hor_spat_ref */
2399 check_marker(s->avctx, gb, "after hor_spat_ref");
2400 skip_bits(gb, 13); /* ver_spat_ref */
2402 skip_bits1(gb); /* change_CR_disable */
2404 if (get_bits1(gb) != 0)
2405 skip_bits(gb, 8); /* constant_alpha_value */
2408 // FIXME complexity estimation stuff
2410 if (ctx->shape != BIN_ONLY_SHAPE) {
2411 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2412 if (s->pict_type != AV_PICTURE_TYPE_I)
2413 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2414 if (s->pict_type == AV_PICTURE_TYPE_B)
2415 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2417 if (get_bits_left(gb) < 3) {
2418 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2419 return AVERROR_INVALIDDATA;
2421 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2422 if (!s->progressive_sequence) {
2423 s->top_field_first = get_bits1(gb);
2424 s->alternate_scan = get_bits1(gb);
2426 s->alternate_scan = 0;
2429 if (s->alternate_scan) {
2430 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2431 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2432 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2433 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2435 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2436 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2437 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2438 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2441 if (s->pict_type == AV_PICTURE_TYPE_S &&
2442 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2443 ctx->vol_sprite_usage == GMC_SPRITE)) {
2444 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2445 return AVERROR_INVALIDDATA;
2446 if (ctx->sprite_brightness_change)
2447 av_log(s->avctx, AV_LOG_ERROR,
2448 "sprite_brightness_change not supported\n");
2449 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2450 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2453 if (ctx->shape != BIN_ONLY_SHAPE) {
2454 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2455 if (s->qscale == 0) {
2456 av_log(s->avctx, AV_LOG_ERROR,
2457 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2458 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2461 if (s->pict_type != AV_PICTURE_TYPE_I) {
2462 s->f_code = get_bits(gb, 3); /* fcode_for */
2463 if (s->f_code == 0) {
2464 av_log(s->avctx, AV_LOG_ERROR,
2465 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2467 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2472 if (s->pict_type == AV_PICTURE_TYPE_B) {
2473 s->b_code = get_bits(gb, 3);
2474 if (s->b_code == 0) {
2475 av_log(s->avctx, AV_LOG_ERROR,
2476 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2478 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2483 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2484 av_log(s->avctx, AV_LOG_DEBUG,
2485 "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",
2486 s->qscale, s->f_code, s->b_code,
2487 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")),
2488 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2489 s->top_field_first, s->quarter_sample ? "q" : "h",
2490 s->data_partitioning, ctx->resync_marker,
2491 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2492 1 - s->no_rounding, s->vo_type,
2493 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2494 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2495 ctx->cplx_estimation_trash_b,
2501 if (!ctx->scalability) {
2502 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2503 skip_bits1(gb); // vop shape coding type
2505 if (ctx->enhancement_type) {
2506 int load_backward_shape = get_bits1(gb);
2507 if (load_backward_shape)
2508 av_log(s->avctx, AV_LOG_ERROR,
2509 "load backward shape isn't supported\n");
2511 skip_bits(gb, 2); // ref_select_code
2514 /* detect buggy encoders which don't set the low_delay flag
2515 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2516 * easily (although it's buggy too) */
2517 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2518 ctx->divx_version == -1 && s->picture_number == 0) {
2519 av_log(s->avctx, AV_LOG_WARNING,
2520 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2524 s->picture_number++; // better than pic number==0 always ;)
2526 // FIXME add short header support
2527 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2528 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2530 if (s->workaround_bugs & FF_BUG_EDGE) {
2531 s->h_edge_pos = s->width;
2532 s->v_edge_pos = s->height;
2538 * Decode MPEG-4 headers.
2539 * @return <0 if no VOP found (or a damaged one)
2540 * FRAME_SKIPPED if a not coded VOP is found
2541 * 0 if a VOP is found
2543 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2545 MpegEncContext *s = &ctx->m;
2546 unsigned startcode, v;
2549 /* search next start code */
2552 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2554 if (get_bits(gb, 8) == 0xF0)
2560 if (get_bits_count(gb) >= gb->size_in_bits) {
2561 if (gb->size_in_bits == 8 &&
2562 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2563 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2564 return FRAME_SKIPPED; // divx bug
2566 return -1; // end of stream
2569 /* use the bits after the test */
2570 v = get_bits(gb, 8);
2571 startcode = ((startcode << 8) | v) & 0xffffffff;
2573 if ((startcode & 0xFFFFFF00) != 0x100)
2574 continue; // no startcode
2576 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2577 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2578 if (startcode <= 0x11F)
2579 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2580 else if (startcode <= 0x12F)
2581 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2582 else if (startcode <= 0x13F)
2583 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2584 else if (startcode <= 0x15F)
2585 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2586 else if (startcode <= 0x1AF)
2587 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2588 else if (startcode == 0x1B0)
2589 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2590 else if (startcode == 0x1B1)
2591 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2592 else if (startcode == 0x1B2)
2593 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2594 else if (startcode == 0x1B3)
2595 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2596 else if (startcode == 0x1B4)
2597 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2598 else if (startcode == 0x1B5)
2599 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2600 else if (startcode == 0x1B6)
2601 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2602 else if (startcode == 0x1B7)
2603 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2604 else if (startcode == 0x1B8)
2605 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2606 else if (startcode == 0x1B9)
2607 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2608 else if (startcode == 0x1BA)
2609 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2610 else if (startcode == 0x1BB)
2611 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2612 else if (startcode == 0x1BC)
2613 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2614 else if (startcode == 0x1BD)
2615 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2616 else if (startcode == 0x1BE)
2617 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2618 else if (startcode == 0x1BF)
2619 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2620 else if (startcode == 0x1C0)
2621 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2622 else if (startcode == 0x1C1)
2623 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2624 else if (startcode == 0x1C2)
2625 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2626 else if (startcode == 0x1C3)
2627 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2628 else if (startcode <= 0x1C5)
2629 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2630 else if (startcode <= 0x1FF)
2631 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2632 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2635 if (startcode >= 0x120 && startcode <= 0x12F) {
2636 if ((ret = decode_vol_header(ctx, gb)) < 0)
2638 } else if (startcode == USER_DATA_STARTCODE) {
2639 decode_user_data(ctx, gb);
2640 } else if (startcode == GOP_STARTCODE) {
2641 mpeg4_decode_gop_header(s, gb);
2642 } else if (startcode == VOS_STARTCODE) {
2643 mpeg4_decode_profile_level(s, gb);
2644 } else if (startcode == VOP_STARTCODE) {
2653 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2655 s->avctx->has_b_frames = !s->low_delay;
2657 return decode_vop_header(ctx, gb);
2660 av_cold void ff_mpeg4videodec_static_init(void) {
2661 static int done = 0;
2664 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2665 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2666 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2667 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2668 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2669 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2670 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2671 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2672 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2673 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2674 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2675 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2676 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2677 &ff_sprite_trajectory_tab[0][1], 4, 2,
2678 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2679 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2680 &ff_mb_type_b_tab[0][1], 2, 1,
2681 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2686 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2688 Mpeg4DecContext *ctx = avctx->priv_data;
2689 MpegEncContext *s = &ctx->m;
2691 /* divx 5.01+ bitstream reorder stuff */
2692 /* Since this clobbers the input buffer and hwaccel codecs still need the
2693 * data during hwaccel->end_frame we should not do this any earlier */
2694 if (s->divx_packed) {
2695 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2696 int startcode_found = 0;
2698 if (buf_size - current_pos > 7) {
2701 for (i = current_pos; i < buf_size - 4; i++)
2706 buf[i + 3] == 0xB6) {
2707 startcode_found = !(buf[i + 4] & 0x40);
2712 if (startcode_found) {
2713 if (!ctx->showed_packed_warning) {
2714 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2715 "wasteful way to store B-frames ('packed B-frames'). "
2716 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2717 ctx->showed_packed_warning = 1;
2719 av_fast_padded_malloc(&s->bitstream_buffer,
2720 &s->allocated_bitstream_buffer_size,
2721 buf_size - current_pos);
2722 if (!s->bitstream_buffer) {
2723 s->bitstream_buffer_size = 0;
2724 return AVERROR(ENOMEM);
2726 memcpy(s->bitstream_buffer, buf + current_pos,
2727 buf_size - current_pos);
2728 s->bitstream_buffer_size = buf_size - current_pos;
2736 static int mpeg4_update_thread_context(AVCodecContext *dst,
2737 const AVCodecContext *src)
2739 Mpeg4DecContext *s = dst->priv_data;
2740 const Mpeg4DecContext *s1 = src->priv_data;
2741 int init = s->m.context_initialized;
2743 int ret = ff_mpeg_update_thread_context(dst, src);
2748 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2750 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2751 ff_xvid_idct_init(&s->m.idsp, dst);
2757 static av_cold int decode_init(AVCodecContext *avctx)
2759 Mpeg4DecContext *ctx = avctx->priv_data;
2760 MpegEncContext *s = &ctx->m;
2766 ctx->lavc_build = -1;
2768 if ((ret = ff_h263_decode_init(avctx)) < 0)
2771 ff_mpeg4videodec_static_init();
2774 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2775 s->decode_mb = mpeg4_decode_mb;
2776 ctx->time_increment_bits = 4; /* default value for broken headers */
2778 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2779 avctx->internal->allocate_progress = 1;
2784 static const AVOption mpeg4_options[] = {
2785 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2786 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2790 static const AVClass mpeg4_class = {
2791 "MPEG4 Video Decoder",
2792 av_default_item_name,
2794 LIBAVUTIL_VERSION_INT,
2797 AVCodec ff_mpeg4_decoder = {
2799 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2800 .type = AVMEDIA_TYPE_VIDEO,
2801 .id = AV_CODEC_ID_MPEG4,
2802 .priv_data_size = sizeof(Mpeg4DecContext),
2803 .init = decode_init,
2804 .close = ff_h263_decode_end,
2805 .decode = ff_h263_decode_frame,
2806 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2807 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2808 AV_CODEC_CAP_FRAME_THREADS,
2809 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2810 .flush = ff_mpeg_flush,
2812 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2813 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2814 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2815 .priv_class = &mpeg4_class,
2819 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2820 static const AVClass mpeg4_vdpau_class = {
2821 "MPEG4 Video VDPAU Decoder",
2822 av_default_item_name,
2824 LIBAVUTIL_VERSION_INT,
2827 AVCodec ff_mpeg4_vdpau_decoder = {
2828 .name = "mpeg4_vdpau",
2829 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2830 .type = AVMEDIA_TYPE_VIDEO,
2831 .id = AV_CODEC_ID_MPEG4,
2832 .priv_data_size = sizeof(Mpeg4DecContext),
2833 .init = decode_init,
2834 .close = ff_h263_decode_end,
2835 .decode = ff_h263_decode_frame,
2836 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2837 AV_CODEC_CAP_HWACCEL_VDPAU,
2838 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2840 .priv_class = &mpeg4_vdpau_class,