3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/opt.h"
26 #include "error_resilience.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
31 #include "mpeg4video.h"
36 /* The defines below define the number of bits that are read at once for
37 * reading vlc values. Changing these may improve speed and data cache needs
38 * be aware though that decreasing them may need the number of stages that is
39 * passed to get_vlc* to be increased. */
40 #define SPRITE_TRAJ_VLC_BITS 6
42 #define MB_TYPE_B_VLC_BITS 4
44 static VLC dc_lum, dc_chrom;
45 static VLC sprite_trajectory;
46 static VLC mb_type_b_vlc;
48 static const int mb_type_b_map[4] = {
49 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
50 MB_TYPE_L0L1 | MB_TYPE_16x16,
51 MB_TYPE_L1 | MB_TYPE_16x16,
52 MB_TYPE_L0 | MB_TYPE_16x16,
57 * @param n block index (0-3 are luma, 4-5 are chroma)
58 * @param dir the ac prediction direction
60 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
63 int16_t *ac_val, *ac_val1;
64 int8_t *const qscale_table = s->current_picture.qscale_table;
67 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
71 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
75 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
78 for (i = 1; i < 8; i++)
79 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
81 /* different qscale, we must rescale */
82 for (i = 1; i < 8; i++)
83 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
86 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
88 ac_val -= 16 * s->block_wrap[n];
90 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
93 for (i = 1; i < 8; i++)
94 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
96 /* different qscale, we must rescale */
97 for (i = 1; i < 8; i++)
98 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
103 for (i = 1; i < 8; i++)
104 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
107 for (i = 1; i < 8; i++)
108 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
112 * check if the next stuff is a resync marker or the end.
115 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
117 MpegEncContext *s = &ctx->m;
118 int bits_count = get_bits_count(&s->gb);
119 int v = show_bits(&s->gb, 16);
121 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
125 if (s->pict_type == AV_PICTURE_TYPE_B ||
126 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
128 skip_bits(&s->gb, 8 + s->pict_type);
129 bits_count += 8 + s->pict_type;
130 v = show_bits(&s->gb, 16);
133 if (bits_count + 8 >= s->gb.size_in_bits) {
135 v |= 0x7F >> (7 - (bits_count & 7));
140 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
142 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
143 GetBitContext gb = s->gb;
145 skip_bits(&s->gb, 1);
146 align_get_bits(&s->gb);
148 for (len = 0; len < 32; len++)
149 if (get_bits1(&s->gb))
152 mb_num = get_bits(&s->gb, mb_num_bits);
153 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
158 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
165 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
167 MpegEncContext *s = &ctx->m;
168 int a = 2 << s->sprite_warping_accuracy;
169 int rho = 3 - s->sprite_warping_accuracy;
175 int min_ab, i, w2, h2, w3, h3;
176 int sprite_ref[4][2];
177 int virtual_ref[2][2];
179 // only true for rectangle shapes
180 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
181 { 0, s->height }, { s->width, s->height } };
182 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
184 if (w <= 0 || h <= 0)
185 return AVERROR_INVALIDDATA;
187 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
191 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
193 x = get_xbits(gb, length);
195 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
196 skip_bits1(gb); /* marker bit */
198 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
200 y = get_xbits(gb, length);
202 skip_bits1(gb); /* marker bit */
203 ctx->sprite_traj[i][0] = d[i][0] = x;
204 ctx->sprite_traj[i][1] = d[i][1] = y;
207 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
209 while ((1 << alpha) < w)
211 while ((1 << beta) < h)
212 beta++; /* typo in the mpeg4 std for the definition of w' and h' */
216 // Note, the 4th point isn't used for GMC
217 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
218 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
219 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
220 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
221 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
222 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
223 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
225 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
226 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
227 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
228 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
229 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
230 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
232 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
233 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
235 /* this is mostly identical to the mpeg4 std (and is totally unreadable
236 * because of that...). Perhaps it should be reordered to be more readable.
237 * The idea behind this virtual_ref mess is to be able to use shifts later
238 * per pixel instead of divides so the distance between points is converted
239 * from w&h based to w2&h2 based which are of the 2^x form. */
240 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
241 ROUNDED_DIV(((w - w2) *
242 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
243 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
244 virtual_ref[0][1] = 16 * vop_ref[0][1] +
245 ROUNDED_DIV(((w - w2) *
246 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
247 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
248 virtual_ref[1][0] = 16 * vop_ref[0][0] +
249 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
250 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
251 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
252 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
253 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
255 switch (ctx->num_sprite_warping_points) {
257 s->sprite_offset[0][0] =
258 s->sprite_offset[0][1] =
259 s->sprite_offset[1][0] =
260 s->sprite_offset[1][1] = 0;
261 s->sprite_delta[0][0] = a;
262 s->sprite_delta[0][1] =
263 s->sprite_delta[1][0] = 0;
264 s->sprite_delta[1][1] = a;
265 ctx->sprite_shift[0] =
266 ctx->sprite_shift[1] = 0;
269 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
270 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
271 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
272 a * (vop_ref[0][0] / 2);
273 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
274 a * (vop_ref[0][1] / 2);
275 s->sprite_delta[0][0] = a;
276 s->sprite_delta[0][1] =
277 s->sprite_delta[1][0] = 0;
278 s->sprite_delta[1][1] = a;
279 ctx->sprite_shift[0] =
280 ctx->sprite_shift[1] = 0;
283 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
284 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
286 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
287 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
288 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
289 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
291 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
292 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
293 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
294 (-2 * vop_ref[0][0] + 1) +
295 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
296 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
297 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
298 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
299 (-2 * vop_ref[0][0] + 1) +
300 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
301 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
302 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
303 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
304 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
305 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
306 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
308 ctx->sprite_shift[0] = alpha + rho;
309 ctx->sprite_shift[1] = alpha + rho + 2;
312 min_ab = FFMIN(alpha, beta);
315 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
316 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
317 h3 * (-vop_ref[0][0]) +
318 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
319 w3 * (-vop_ref[0][1]) +
320 (1 << (alpha + beta + rho - min_ab - 1));
321 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
322 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
323 h3 * (-vop_ref[0][0]) +
324 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
325 w3 * (-vop_ref[0][1]) +
326 (1 << (alpha + beta + rho - min_ab - 1));
327 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
328 h3 * (-2 * vop_ref[0][0] + 1) +
329 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
330 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
331 r * sprite_ref[0][0] - 16 * w2 * h3 +
332 (1 << (alpha + beta + rho - min_ab + 1));
333 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
334 h3 * (-2 * vop_ref[0][0] + 1) +
335 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
336 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
337 r * sprite_ref[0][1] - 16 * w2 * h3 +
338 (1 << (alpha + beta + rho - min_ab + 1));
339 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
340 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
341 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
342 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
344 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
345 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
348 /* try to simplify the situation */
349 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
350 s->sprite_delta[0][1] == 0 &&
351 s->sprite_delta[1][0] == 0 &&
352 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
353 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
354 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
355 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
356 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
357 s->sprite_delta[0][0] = a;
358 s->sprite_delta[0][1] = 0;
359 s->sprite_delta[1][0] = 0;
360 s->sprite_delta[1][1] = a;
361 ctx->sprite_shift[0] = 0;
362 ctx->sprite_shift[1] = 0;
363 s->real_sprite_warping_points = 1;
365 int shift_y = 16 - ctx->sprite_shift[0];
366 int shift_c = 16 - ctx->sprite_shift[1];
367 for (i = 0; i < 2; i++) {
368 s->sprite_offset[0][i] <<= shift_y;
369 s->sprite_offset[1][i] <<= shift_c;
370 s->sprite_delta[0][i] <<= shift_y;
371 s->sprite_delta[1][i] <<= shift_y;
372 ctx->sprite_shift[i] = 16;
374 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
380 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
381 int len = FFMIN(ctx->time_increment_bits + 3, 15);
386 check_marker(gb, "after new_pred");
392 * Decode the next video packet.
393 * @return <0 if something went wrong
395 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
397 MpegEncContext *s = &ctx->m;
399 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
400 int header_extension = 0, mb_num, len;
402 /* is there enough space left for a video packet + header */
403 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
406 for (len = 0; len < 32; len++)
407 if (get_bits1(&s->gb))
410 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
411 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
415 if (ctx->shape != RECT_SHAPE) {
416 header_extension = get_bits1(&s->gb);
417 // FIXME more stuff here
420 mb_num = get_bits(&s->gb, mb_num_bits);
421 if (mb_num >= s->mb_num) {
422 av_log(s->avctx, AV_LOG_ERROR,
423 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
427 s->mb_x = mb_num % s->mb_width;
428 s->mb_y = mb_num / s->mb_width;
430 if (ctx->shape != BIN_ONLY_SHAPE) {
431 int qscale = get_bits(&s->gb, s->quant_precision);
433 s->chroma_qscale = s->qscale = qscale;
436 if (ctx->shape == RECT_SHAPE)
437 header_extension = get_bits1(&s->gb);
439 if (header_extension) {
442 while (get_bits1(&s->gb) != 0)
445 check_marker(&s->gb, "before time_increment in video packed header");
446 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
447 check_marker(&s->gb, "before vop_coding_type in video packed header");
449 skip_bits(&s->gb, 2); /* vop coding type */
450 // FIXME not rect stuff here
452 if (ctx->shape != BIN_ONLY_SHAPE) {
453 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
454 // FIXME don't just ignore everything
455 if (s->pict_type == AV_PICTURE_TYPE_S &&
456 ctx->vol_sprite_usage == GMC_SPRITE) {
457 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
458 return AVERROR_INVALIDDATA;
459 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
462 // FIXME reduced res stuff here
464 if (s->pict_type != AV_PICTURE_TYPE_I) {
465 int f_code = get_bits(&s->gb, 3); /* fcode_for */
467 av_log(s->avctx, AV_LOG_ERROR,
468 "Error, video packet header damaged (f_code=0)\n");
470 if (s->pict_type == AV_PICTURE_TYPE_B) {
471 int b_code = get_bits(&s->gb, 3);
473 av_log(s->avctx, AV_LOG_ERROR,
474 "Error, video packet header damaged (b_code=0)\n");
479 decode_new_pred(ctx, &s->gb);
485 * Get the average motion vector for a GMC MB.
486 * @param n either 0 for the x component or 1 for y
487 * @return the average MV for a GMC MB
489 static inline int get_amv(Mpeg4DecContext *ctx, int n)
491 MpegEncContext *s = &ctx->m;
492 int x, y, mb_v, sum, dx, dy, shift;
493 int len = 1 << (s->f_code + 4);
494 const int a = s->sprite_warping_accuracy;
496 if (s->workaround_bugs & FF_BUG_AMV)
497 len >>= s->quarter_sample;
499 if (s->real_sprite_warping_points == 1) {
500 if (ctx->divx_version == 500 && ctx->divx_build == 413)
501 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
503 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
505 dx = s->sprite_delta[n][0];
506 dy = s->sprite_delta[n][1];
507 shift = ctx->sprite_shift[0];
509 dy -= 1 << (shift + a + 1);
511 dx -= 1 << (shift + a + 1);
512 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
515 for (y = 0; y < 16; y++) {
520 for (x = 0; x < 16; x++) {
525 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
537 * Decode the dc value.
538 * @param n block index (0-3 are luma, 4-5 are chroma)
539 * @param dir_ptr the prediction direction will be stored here
540 * @return the quantized dc
542 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
547 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
549 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
551 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
552 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
561 level = 2 * get_bits1(&s->gb) - 1;
563 if (get_bits1(&s->gb))
564 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
566 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
569 level = get_xbits(&s->gb, code);
573 if (get_bits1(&s->gb) == 0) { /* marker */
574 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
575 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
582 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
586 * Decode first partition.
587 * @return number of MBs decoded or <0 if an error occurred
589 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
591 MpegEncContext *s = &ctx->m;
593 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
595 /* decode first partition */
596 s->first_slice_line = 1;
597 for (; s->mb_y < s->mb_height; s->mb_y++) {
598 ff_init_block_index(s);
599 for (; s->mb_x < s->mb_width; s->mb_x++) {
600 const int xy = s->mb_x + s->mb_y * s->mb_stride;
605 ff_update_block_index(s);
606 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
607 s->first_slice_line = 0;
609 if (s->pict_type == AV_PICTURE_TYPE_I) {
613 if (show_bits_long(&s->gb, 19) == DC_MARKER)
616 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
618 av_log(s->avctx, AV_LOG_ERROR,
619 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
624 s->cbp_table[xy] = cbpc & 3;
625 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
629 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
631 s->current_picture.qscale_table[xy] = s->qscale;
633 s->mbintra_table[xy] = 1;
634 for (i = 0; i < 6; i++) {
636 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
638 av_log(s->avctx, AV_LOG_ERROR,
639 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
646 s->pred_dir_table[xy] = dir;
647 } else { /* P/S_TYPE */
648 int mx, my, pred_x, pred_y, bits;
649 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
650 const int stride = s->b8_stride * 2;
653 bits = show_bits(&s->gb, 17);
654 if (bits == MOTION_MARKER)
658 if (bits & 0x10000) {
660 if (s->pict_type == AV_PICTURE_TYPE_S &&
661 ctx->vol_sprite_usage == GMC_SPRITE) {
662 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
666 mx = get_amv(ctx, 0);
667 my = get_amv(ctx, 1);
669 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
676 mot_val[0 + stride] =
677 mot_val[2 + stride] = mx;
680 mot_val[1 + stride] =
681 mot_val[3 + stride] = my;
683 if (s->mbintra_table[xy])
684 ff_clean_intra_table_entries(s);
688 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
690 av_log(s->avctx, AV_LOG_ERROR,
691 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
697 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
699 s->mb_intra = ((cbpc & 4) != 0);
702 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
703 s->mbintra_table[xy] = 1;
706 mot_val[0 + stride] =
707 mot_val[2 + stride] = 0;
710 mot_val[1 + stride] =
711 mot_val[3 + stride] = 0;
713 if (s->mbintra_table[xy])
714 ff_clean_intra_table_entries(s);
716 if (s->pict_type == AV_PICTURE_TYPE_S &&
717 ctx->vol_sprite_usage == GMC_SPRITE &&
719 s->mcsel = get_bits1(&s->gb);
723 if ((cbpc & 16) == 0) {
724 /* 16x16 motion prediction */
726 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
728 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
732 my = ff_h263_decode_motion(s, pred_y, s->f_code);
735 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
738 mx = get_amv(ctx, 0);
739 my = get_amv(ctx, 1);
740 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
747 mot_val[0 + stride] =
748 mot_val[2 + stride] = mx;
751 mot_val[1 + stride] =
752 mot_val[3 + stride] = my;
755 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
757 for (i = 0; i < 4; i++) {
758 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
759 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
763 my = ff_h263_decode_motion(s, pred_y, s->f_code);
780 * decode second partition.
781 * @return <0 if an error occurred
783 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
786 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
788 s->mb_x = s->resync_mb_x;
789 s->first_slice_line = 1;
790 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
791 ff_init_block_index(s);
792 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
793 const int xy = s->mb_x + s->mb_y * s->mb_stride;
796 ff_update_block_index(s);
797 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
798 s->first_slice_line = 0;
800 if (s->pict_type == AV_PICTURE_TYPE_I) {
801 int ac_pred = get_bits1(&s->gb);
802 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
804 av_log(s->avctx, AV_LOG_ERROR,
805 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
809 s->cbp_table[xy] |= cbpy << 2;
810 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
811 } else { /* P || S_TYPE */
812 if (IS_INTRA(s->current_picture.mb_type[xy])) {
815 int ac_pred = get_bits1(&s->gb);
816 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
819 av_log(s->avctx, AV_LOG_ERROR,
820 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
824 if (s->cbp_table[xy] & 8)
825 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
826 s->current_picture.qscale_table[xy] = s->qscale;
828 for (i = 0; i < 6; i++) {
830 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
832 av_log(s->avctx, AV_LOG_ERROR,
833 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
840 s->cbp_table[xy] &= 3; // remove dquant
841 s->cbp_table[xy] |= cbpy << 2;
842 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
843 s->pred_dir_table[xy] = dir;
844 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
845 s->current_picture.qscale_table[xy] = s->qscale;
846 s->cbp_table[xy] = 0;
848 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
851 av_log(s->avctx, AV_LOG_ERROR,
852 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
856 if (s->cbp_table[xy] & 8)
857 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
858 s->current_picture.qscale_table[xy] = s->qscale;
860 s->cbp_table[xy] &= 3; // remove dquant
861 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
865 if (mb_num >= mb_count)
873 * Decode the first and second partition.
874 * @return <0 if error (and sets error type in the error_status_table)
876 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
878 MpegEncContext *s = &ctx->m;
880 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
881 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
883 mb_num = mpeg4_decode_partition_a(ctx);
885 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
886 s->mb_x, s->mb_y, part_a_error);
890 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
891 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
892 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
893 s->mb_x, s->mb_y, part_a_error);
897 s->mb_num_left = mb_num;
899 if (s->pict_type == AV_PICTURE_TYPE_I) {
900 while (show_bits(&s->gb, 9) == 1)
901 skip_bits(&s->gb, 9);
902 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
903 av_log(s->avctx, AV_LOG_ERROR,
904 "marker missing after first I partition at %d %d\n",
909 while (show_bits(&s->gb, 10) == 1)
910 skip_bits(&s->gb, 10);
911 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
912 av_log(s->avctx, AV_LOG_ERROR,
913 "marker missing after first P partition at %d %d\n",
918 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
919 s->mb_x - 1, s->mb_y, part_a_end);
921 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
922 if (s->pict_type == AV_PICTURE_TYPE_P)
923 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
924 s->mb_x, s->mb_y, ER_DC_ERROR);
927 if (s->pict_type == AV_PICTURE_TYPE_P)
928 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
929 s->mb_x - 1, s->mb_y, ER_DC_END);
937 * @return <0 if an error occurred
939 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
940 int n, int coded, int intra, int rvlc)
942 MpegEncContext *s = &ctx->m;
943 int level, i, last, run, qmul, qadd;
944 int av_uninit(dc_pred_dir);
947 const uint8_t *scan_table;
949 // Note intra & rvlc should be optimized away if this is inlined
952 if (ctx->use_intra_dc_vlc) {
954 if (s->partitioned_frame) {
955 level = s->dc_val[0][s->block_index[n]];
957 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
959 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
960 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
962 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
970 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
976 rl = &ff_rvlc_rl_intra;
977 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
979 rl = &ff_mpeg4_rl_intra;
980 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
983 if (dc_pred_dir == 0)
984 scan_table = s->intra_v_scantable.permutated; /* left */
986 scan_table = s->intra_h_scantable.permutated; /* top */
988 scan_table = s->intra_scantable.permutated;
995 s->block_last_index[n] = i;
999 rl = &ff_rvlc_rl_inter;
1001 rl = &ff_h263_rl_inter;
1003 scan_table = s->intra_scantable.permutated;
1005 if (s->mpeg_quant) {
1009 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1011 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1013 qmul = s->qscale << 1;
1014 qadd = (s->qscale - 1) | 1;
1016 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1018 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1022 OPEN_READER(re, &s->gb);
1024 UPDATE_CACHE(re, &s->gb);
1025 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1029 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1030 av_log(s->avctx, AV_LOG_ERROR,
1031 "1. marker bit missing in rvlc esc\n");
1034 SKIP_CACHE(re, &s->gb, 1);
1036 last = SHOW_UBITS(re, &s->gb, 1);
1037 SKIP_CACHE(re, &s->gb, 1);
1038 run = SHOW_UBITS(re, &s->gb, 6);
1039 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1040 UPDATE_CACHE(re, &s->gb);
1042 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1043 av_log(s->avctx, AV_LOG_ERROR,
1044 "2. marker bit missing in rvlc esc\n");
1047 SKIP_CACHE(re, &s->gb, 1);
1049 level = SHOW_UBITS(re, &s->gb, 11);
1050 SKIP_CACHE(re, &s->gb, 11);
1052 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1053 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1056 SKIP_CACHE(re, &s->gb, 5);
1058 level = level * qmul + qadd;
1059 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1060 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1067 cache = GET_CACHE(re, &s->gb);
1070 cache ^= 0xC0000000;
1072 if (cache & 0x80000000) {
1073 if (cache & 0x40000000) {
1075 SKIP_CACHE(re, &s->gb, 2);
1076 last = SHOW_UBITS(re, &s->gb, 1);
1077 SKIP_CACHE(re, &s->gb, 1);
1078 run = SHOW_UBITS(re, &s->gb, 6);
1079 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1080 UPDATE_CACHE(re, &s->gb);
1083 level = SHOW_SBITS(re, &s->gb, 12);
1084 LAST_SKIP_BITS(re, &s->gb, 12);
1086 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1087 av_log(s->avctx, AV_LOG_ERROR,
1088 "1. marker bit missing in 3. esc\n");
1089 if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1092 SKIP_CACHE(re, &s->gb, 1);
1094 level = SHOW_SBITS(re, &s->gb, 12);
1095 SKIP_CACHE(re, &s->gb, 12);
1097 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1098 av_log(s->avctx, AV_LOG_ERROR,
1099 "2. marker bit missing in 3. esc\n");
1100 if (!(s->err_recognition & AV_EF_IGNORE_ERR))
1104 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1108 if (s->error_recognition >= FF_ER_COMPLIANT) {
1109 const int abs_level= FFABS(level);
1110 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1111 const int run1= run - rl->max_run[last][abs_level] - 1;
1112 if (abs_level <= rl->max_level[last][run]) {
1113 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1116 if (s->error_recognition > FF_ER_COMPLIANT) {
1117 if (abs_level <= rl->max_level[last][run]*2) {
1118 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1121 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1122 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1130 level = level * qmul + qadd;
1132 level = level * qmul - qadd;
1134 if ((unsigned)(level + 2048) > 4095) {
1135 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1136 if (level > 2560 || level < -2560) {
1137 av_log(s->avctx, AV_LOG_ERROR,
1138 "|level| overflow in 3. esc, qp=%d\n",
1143 level = level < 0 ? -2048 : 2047;
1151 SKIP_BITS(re, &s->gb, 2);
1152 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1153 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1154 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1155 LAST_SKIP_BITS(re, &s->gb, 1);
1159 SKIP_BITS(re, &s->gb, 1);
1160 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1162 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1163 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1164 LAST_SKIP_BITS(re, &s->gb, 1);
1169 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1170 LAST_SKIP_BITS(re, &s->gb, 1);
1172 tprintf(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1176 av_log(s->avctx, AV_LOG_ERROR,
1177 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1181 block[scan_table[i]] = level;
1185 block[scan_table[i]] = level;
1187 CLOSE_READER(re, &s->gb);
1192 if (!ctx->use_intra_dc_vlc) {
1193 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1195 i -= i >> 31; // if (i == -1) i = 0;
1198 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1200 i = 63; // FIXME not optimal
1202 s->block_last_index[n] = i;
1207 * decode partition C of one MB.
1208 * @return <0 if an error occurred
1210 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1212 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1214 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1216 mb_type = s->current_picture.mb_type[xy];
1217 cbp = s->cbp_table[xy];
1219 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1221 if (s->current_picture.qscale_table[xy] != s->qscale)
1222 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1224 if (s->pict_type == AV_PICTURE_TYPE_P ||
1225 s->pict_type == AV_PICTURE_TYPE_S) {
1227 for (i = 0; i < 4; i++) {
1228 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1229 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1231 s->mb_intra = IS_INTRA(mb_type);
1233 if (IS_SKIP(mb_type)) {
1235 for (i = 0; i < 6; i++)
1236 s->block_last_index[i] = -1;
1237 s->mv_dir = MV_DIR_FORWARD;
1238 s->mv_type = MV_TYPE_16X16;
1239 if (s->pict_type == AV_PICTURE_TYPE_S
1240 && ctx->vol_sprite_usage == GMC_SPRITE) {
1247 } else if (s->mb_intra) {
1248 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1249 } else if (!s->mb_intra) {
1250 // s->mcsel = 0; // FIXME do we need to init that?
1252 s->mv_dir = MV_DIR_FORWARD;
1253 if (IS_8X8(mb_type)) {
1254 s->mv_type = MV_TYPE_8X8;
1256 s->mv_type = MV_TYPE_16X16;
1259 } else { /* I-Frame */
1261 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1264 if (!IS_SKIP(mb_type)) {
1266 s->bdsp.clear_blocks(s->block[0]);
1267 /* decode each block */
1268 for (i = 0; i < 6; i++) {
1269 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1270 av_log(s->avctx, AV_LOG_ERROR,
1271 "texture corrupted at %d %d %d\n",
1272 s->mb_x, s->mb_y, s->mb_intra);
1279 /* per-MB end of slice check */
1280 if (--s->mb_num_left <= 0) {
1281 if (mpeg4_is_resync(ctx))
1286 if (mpeg4_is_resync(ctx)) {
1287 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1288 if (s->cbp_table[xy + delta])
1295 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1297 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1298 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1300 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1301 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1303 av_assert2(s->h263_pred);
1305 if (s->pict_type == AV_PICTURE_TYPE_P ||
1306 s->pict_type == AV_PICTURE_TYPE_S) {
1308 if (get_bits1(&s->gb)) {
1311 for (i = 0; i < 6; i++)
1312 s->block_last_index[i] = -1;
1313 s->mv_dir = MV_DIR_FORWARD;
1314 s->mv_type = MV_TYPE_16X16;
1315 if (s->pict_type == AV_PICTURE_TYPE_S &&
1316 ctx->vol_sprite_usage == GMC_SPRITE) {
1317 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1322 s->mv[0][0][0] = get_amv(ctx, 0);
1323 s->mv[0][0][1] = get_amv(ctx, 1);
1326 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1336 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1338 av_log(s->avctx, AV_LOG_ERROR,
1339 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1342 } while (cbpc == 20);
1344 s->bdsp.clear_blocks(s->block[0]);
1346 s->mb_intra = ((cbpc & 4) != 0);
1350 if (s->pict_type == AV_PICTURE_TYPE_S &&
1351 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1352 s->mcsel = get_bits1(&s->gb);
1355 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1357 cbp = (cbpc & 3) | (cbpy << 2);
1359 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1360 if ((!s->progressive_sequence) &&
1361 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1362 s->interlaced_dct = get_bits1(&s->gb);
1364 s->mv_dir = MV_DIR_FORWARD;
1365 if ((cbpc & 16) == 0) {
1367 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1370 /* 16x16 global motion prediction */
1371 s->mv_type = MV_TYPE_16X16;
1372 mx = get_amv(ctx, 0);
1373 my = get_amv(ctx, 1);
1374 s->mv[0][0][0] = mx;
1375 s->mv[0][0][1] = my;
1376 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1377 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1380 /* 16x8 field motion prediction */
1381 s->mv_type = MV_TYPE_FIELD;
1383 s->field_select[0][0] = get_bits1(&s->gb);
1384 s->field_select[0][1] = get_bits1(&s->gb);
1386 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1388 for (i = 0; i < 2; i++) {
1389 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1393 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1397 s->mv[0][i][0] = mx;
1398 s->mv[0][i][1] = my;
1401 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1402 /* 16x16 motion prediction */
1403 s->mv_type = MV_TYPE_16X16;
1404 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1405 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1410 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1414 s->mv[0][0][0] = mx;
1415 s->mv[0][0][1] = my;
1418 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1419 s->mv_type = MV_TYPE_8X8;
1420 for (i = 0; i < 4; i++) {
1421 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1422 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1426 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1429 s->mv[0][i][0] = mx;
1430 s->mv[0][i][1] = my;
1435 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1436 int modb1; // first bit of modb
1437 int modb2; // second bit of modb
1440 s->mb_intra = 0; // B-frames never contain intra blocks
1441 s->mcsel = 0; // ... true gmc blocks
1444 for (i = 0; i < 2; i++) {
1445 s->last_mv[i][0][0] =
1446 s->last_mv[i][0][1] =
1447 s->last_mv[i][1][0] =
1448 s->last_mv[i][1][1] = 0;
1451 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1454 /* if we skipped it in the future P Frame than skip it now too */
1455 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1457 if (s->mb_skipped) {
1459 for (i = 0; i < 6; i++)
1460 s->block_last_index[i] = -1;
1462 s->mv_dir = MV_DIR_FORWARD;
1463 s->mv_type = MV_TYPE_16X16;
1468 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1474 modb1 = get_bits1(&s->gb);
1476 // like MB_TYPE_B_DIRECT but no vectors coded
1477 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1480 modb2 = get_bits1(&s->gb);
1481 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1483 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1486 mb_type = mb_type_b_map[mb_type];
1490 s->bdsp.clear_blocks(s->block[0]);
1491 cbp = get_bits(&s->gb, 6);
1494 if ((!IS_DIRECT(mb_type)) && cbp) {
1495 if (get_bits1(&s->gb))
1496 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1499 if (!s->progressive_sequence) {
1501 s->interlaced_dct = get_bits1(&s->gb);
1503 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1504 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1505 mb_type &= ~MB_TYPE_16x16;
1507 if (USES_LIST(mb_type, 0)) {
1508 s->field_select[0][0] = get_bits1(&s->gb);
1509 s->field_select[0][1] = get_bits1(&s->gb);
1511 if (USES_LIST(mb_type, 1)) {
1512 s->field_select[1][0] = get_bits1(&s->gb);
1513 s->field_select[1][1] = get_bits1(&s->gb);
1519 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1520 s->mv_type = MV_TYPE_16X16;
1522 if (USES_LIST(mb_type, 0)) {
1523 s->mv_dir = MV_DIR_FORWARD;
1525 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1526 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1527 s->last_mv[0][1][0] =
1528 s->last_mv[0][0][0] =
1529 s->mv[0][0][0] = mx;
1530 s->last_mv[0][1][1] =
1531 s->last_mv[0][0][1] =
1532 s->mv[0][0][1] = my;
1535 if (USES_LIST(mb_type, 1)) {
1536 s->mv_dir |= MV_DIR_BACKWARD;
1538 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1539 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1540 s->last_mv[1][1][0] =
1541 s->last_mv[1][0][0] =
1542 s->mv[1][0][0] = mx;
1543 s->last_mv[1][1][1] =
1544 s->last_mv[1][0][1] =
1545 s->mv[1][0][1] = my;
1547 } else if (!IS_DIRECT(mb_type)) {
1548 s->mv_type = MV_TYPE_FIELD;
1550 if (USES_LIST(mb_type, 0)) {
1551 s->mv_dir = MV_DIR_FORWARD;
1553 for (i = 0; i < 2; i++) {
1554 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1555 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1556 s->last_mv[0][i][0] =
1557 s->mv[0][i][0] = mx;
1558 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1562 if (USES_LIST(mb_type, 1)) {
1563 s->mv_dir |= MV_DIR_BACKWARD;
1565 for (i = 0; i < 2; i++) {
1566 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1567 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1568 s->last_mv[1][i][0] =
1569 s->mv[1][i][0] = mx;
1570 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1576 if (IS_DIRECT(mb_type)) {
1577 if (IS_SKIP(mb_type)) {
1581 mx = ff_h263_decode_motion(s, 0, 1);
1582 my = ff_h263_decode_motion(s, 0, 1);
1585 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1586 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1588 s->current_picture.mb_type[xy] = mb_type;
1589 } else { /* I-Frame */
1591 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1593 av_log(s->avctx, AV_LOG_ERROR,
1594 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1597 } while (cbpc == 8);
1603 s->ac_pred = get_bits1(&s->gb);
1605 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1607 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1609 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1611 av_log(s->avctx, AV_LOG_ERROR,
1612 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1615 cbp = (cbpc & 3) | (cbpy << 2);
1617 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1620 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1622 if (!s->progressive_sequence)
1623 s->interlaced_dct = get_bits1(&s->gb);
1625 s->bdsp.clear_blocks(s->block[0]);
1626 /* decode each block */
1627 for (i = 0; i < 6; i++) {
1628 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1635 /* decode each block */
1636 for (i = 0; i < 6; i++) {
1637 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1643 /* per-MB end of slice check */
1644 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1645 int next = mpeg4_is_resync(ctx);
1647 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1649 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1652 if (s->pict_type == AV_PICTURE_TYPE_B) {
1653 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1654 ff_thread_await_progress(&s->next_picture_ptr->tf,
1655 (s->mb_x + delta >= s->mb_width)
1656 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1658 if (s->next_picture.mbskip_table[xy + delta])
1669 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1671 int hours, minutes, seconds;
1673 if (!show_bits(gb, 23)) {
1674 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1678 hours = get_bits(gb, 5);
1679 minutes = get_bits(gb, 6);
1681 seconds = get_bits(gb, 6);
1683 s->time_base = seconds + 60*(minutes + 60*hours);
1691 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1694 s->avctx->profile = get_bits(gb, 4);
1695 s->avctx->level = get_bits(gb, 4);
1697 // for Simple profile, level 0
1698 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1699 s->avctx->level = 0;
1705 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1707 MpegEncContext *s = &ctx->m;
1708 int width, height, vo_ver_id;
1711 skip_bits(gb, 1); /* random access */
1712 s->vo_type = get_bits(gb, 8);
1713 if (get_bits1(gb) != 0) { /* is_ol_id */
1714 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1715 skip_bits(gb, 3); /* vo_priority */
1719 s->aspect_ratio_info = get_bits(gb, 4);
1720 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1721 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1722 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1724 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1727 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1728 int chroma_format = get_bits(gb, 2);
1729 if (chroma_format != CHROMA_420)
1730 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1732 s->low_delay = get_bits1(gb);
1733 if (get_bits1(gb)) { /* vbv parameters */
1734 get_bits(gb, 15); /* first_half_bitrate */
1735 skip_bits1(gb); /* marker */
1736 get_bits(gb, 15); /* latter_half_bitrate */
1737 skip_bits1(gb); /* marker */
1738 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1739 skip_bits1(gb); /* marker */
1740 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1741 get_bits(gb, 11); /* first_half_vbv_occupancy */
1742 skip_bits1(gb); /* marker */
1743 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1744 skip_bits1(gb); /* marker */
1747 /* is setting low delay flag only once the smartest thing to do?
1748 * low delay detection won't be overridden. */
1749 if (s->picture_number == 0)
1753 ctx->shape = get_bits(gb, 2); /* vol shape */
1754 if (ctx->shape != RECT_SHAPE)
1755 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1756 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1757 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1758 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1761 check_marker(gb, "before time_increment_resolution");
1763 s->avctx->framerate.num = get_bits(gb, 16);
1764 if (!s->avctx->framerate.num) {
1765 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1766 return AVERROR_INVALIDDATA;
1769 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1770 if (ctx->time_increment_bits < 1)
1771 ctx->time_increment_bits = 1;
1773 check_marker(gb, "before fixed_vop_rate");
1775 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1776 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1778 s->avctx->framerate.den = 1;
1780 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1784 if (ctx->shape != BIN_ONLY_SHAPE) {
1785 if (ctx->shape == RECT_SHAPE) {
1786 check_marker(gb, "before width");
1787 width = get_bits(gb, 13);
1788 check_marker(gb, "before height");
1789 height = get_bits(gb, 13);
1790 check_marker(gb, "after height");
1791 if (width && height && /* they should be non zero but who knows */
1792 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1793 if (s->width && s->height &&
1794 (s->width != width || s->height != height))
1795 s->context_reinit = 1;
1801 s->progressive_sequence =
1802 s->progressive_frame = get_bits1(gb) ^ 1;
1803 s->interlaced_dct = 0;
1804 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1805 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1806 "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1808 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1810 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1812 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1813 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1814 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1815 ctx->vol_sprite_usage == GMC_SPRITE) {
1816 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1817 skip_bits(gb, 13); // sprite_width
1818 skip_bits1(gb); /* marker */
1819 skip_bits(gb, 13); // sprite_height
1820 skip_bits1(gb); /* marker */
1821 skip_bits(gb, 13); // sprite_left
1822 skip_bits1(gb); /* marker */
1823 skip_bits(gb, 13); // sprite_top
1824 skip_bits1(gb); /* marker */
1826 ctx->num_sprite_warping_points = get_bits(gb, 6);
1827 if (ctx->num_sprite_warping_points > 3) {
1828 av_log(s->avctx, AV_LOG_ERROR,
1829 "%d sprite_warping_points\n",
1830 ctx->num_sprite_warping_points);
1831 ctx->num_sprite_warping_points = 0;
1832 return AVERROR_INVALIDDATA;
1834 s->sprite_warping_accuracy = get_bits(gb, 2);
1835 ctx->sprite_brightness_change = get_bits1(gb);
1836 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1837 skip_bits1(gb); // low_latency_sprite
1839 // FIXME sadct disable bit if verid!=1 && shape not rect
1841 if (get_bits1(gb) == 1) { /* not_8_bit */
1842 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1843 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1844 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1845 if (s->quant_precision != 5)
1846 av_log(s->avctx, AV_LOG_ERROR,
1847 "quant precision %d\n", s->quant_precision);
1848 if (s->quant_precision<3 || s->quant_precision>9) {
1849 s->quant_precision = 5;
1852 s->quant_precision = 5;
1855 // FIXME a bunch of grayscale shape things
1857 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1860 /* load default matrixes */
1861 for (i = 0; i < 64; i++) {
1862 int j = s->idsp.idct_permutation[i];
1863 v = ff_mpeg4_default_intra_matrix[i];
1864 s->intra_matrix[j] = v;
1865 s->chroma_intra_matrix[j] = v;
1867 v = ff_mpeg4_default_non_intra_matrix[i];
1868 s->inter_matrix[j] = v;
1869 s->chroma_inter_matrix[j] = v;
1872 /* load custom intra matrix */
1873 if (get_bits1(gb)) {
1875 for (i = 0; i < 64; i++) {
1877 v = get_bits(gb, 8);
1882 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1883 s->intra_matrix[j] = last;
1884 s->chroma_intra_matrix[j] = last;
1887 /* replicate last value */
1888 for (; i < 64; i++) {
1889 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1890 s->intra_matrix[j] = last;
1891 s->chroma_intra_matrix[j] = last;
1895 /* load custom non intra matrix */
1896 if (get_bits1(gb)) {
1898 for (i = 0; i < 64; i++) {
1900 v = get_bits(gb, 8);
1905 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1906 s->inter_matrix[j] = v;
1907 s->chroma_inter_matrix[j] = v;
1910 /* replicate last value */
1911 for (; i < 64; i++) {
1912 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1913 s->inter_matrix[j] = last;
1914 s->chroma_inter_matrix[j] = last;
1918 // FIXME a bunch of grayscale shape things
1922 s->quarter_sample = get_bits1(gb);
1924 s->quarter_sample = 0;
1926 if (get_bits_left(gb) < 4) {
1927 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1928 return AVERROR_INVALIDDATA;
1931 if (!get_bits1(gb)) {
1932 int pos = get_bits_count(gb);
1933 int estimation_method = get_bits(gb, 2);
1934 if (estimation_method < 2) {
1935 if (!get_bits1(gb)) {
1936 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1937 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1938 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1939 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1940 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1941 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1943 if (!get_bits1(gb)) {
1944 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1945 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1946 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1947 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1949 if (!check_marker(gb, "in complexity estimation part 1")) {
1950 skip_bits_long(gb, pos - get_bits_count(gb));
1953 if (!get_bits1(gb)) {
1954 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1955 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1956 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1957 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1959 if (!get_bits1(gb)) {
1960 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1961 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1962 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1963 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1964 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1965 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1967 if (!check_marker(gb, "in complexity estimation part 2")) {
1968 skip_bits_long(gb, pos - get_bits_count(gb));
1971 if (estimation_method == 1) {
1972 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1973 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1976 av_log(s->avctx, AV_LOG_ERROR,
1977 "Invalid Complexity estimation method %d\n",
1982 ctx->cplx_estimation_trash_i =
1983 ctx->cplx_estimation_trash_p =
1984 ctx->cplx_estimation_trash_b = 0;
1987 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1989 s->data_partitioning = get_bits1(gb);
1990 if (s->data_partitioning)
1991 ctx->rvlc = get_bits1(gb);
1993 if (vo_ver_id != 1) {
1994 ctx->new_pred = get_bits1(gb);
1995 if (ctx->new_pred) {
1996 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1997 skip_bits(gb, 2); /* requested upstream message type */
1998 skip_bits1(gb); /* newpred segment type */
2000 if (get_bits1(gb)) // reduced_res_vop
2001 av_log(s->avctx, AV_LOG_ERROR,
2002 "reduced resolution VOP not supported\n");
2007 ctx->scalability = get_bits1(gb);
2009 if (ctx->scalability) {
2010 GetBitContext bak = *gb;
2011 int h_sampling_factor_n;
2012 int h_sampling_factor_m;
2013 int v_sampling_factor_n;
2014 int v_sampling_factor_m;
2016 skip_bits1(gb); // hierarchy_type
2017 skip_bits(gb, 4); /* ref_layer_id */
2018 skip_bits1(gb); /* ref_layer_sampling_dir */
2019 h_sampling_factor_n = get_bits(gb, 5);
2020 h_sampling_factor_m = get_bits(gb, 5);
2021 v_sampling_factor_n = get_bits(gb, 5);
2022 v_sampling_factor_m = get_bits(gb, 5);
2023 ctx->enhancement_type = get_bits1(gb);
2025 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2026 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2027 /* illegal scalability header (VERY broken encoder),
2028 * trying to workaround */
2029 ctx->scalability = 0;
2032 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2034 // bin shape stuff FIXME
2038 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2039 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2040 s->avctx->framerate.den, s->avctx->framerate.num,
2041 ctx->time_increment_bits,
2043 s->progressive_sequence,
2044 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2045 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2053 * Decode the user data stuff in the header.
2054 * Also initializes divx/xvid/lavc_version/build.
2056 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2058 MpegEncContext *s = &ctx->m;
2062 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2065 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2066 if (show_bits(gb, 23) == 0)
2068 buf[i] = get_bits(gb, 8);
2072 /* divx detection */
2073 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2075 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2077 ctx->divx_version = ver;
2078 ctx->divx_build = build;
2079 s->divx_packed = e == 3 && last == 'p';
2080 if (s->divx_packed && !ctx->showed_packed_warning) {
2081 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2082 "wasteful way to store B-frames ('packed B-frames'). "
2083 "Consider using a tool like VirtualDub or avidemux to fix it.\n");
2084 ctx->showed_packed_warning = 1;
2088 /* libavcodec detection */
2089 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2091 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2093 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2095 build = (ver << 16) + (ver2 << 8) + ver3;
2098 if (strcmp(buf, "ffmpeg") == 0)
2099 ctx->lavc_build = 4600;
2102 ctx->lavc_build = build;
2104 /* Xvid detection */
2105 e = sscanf(buf, "XviD%d", &build);
2107 ctx->xvid_build = build;
2112 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2114 Mpeg4DecContext *ctx = avctx->priv_data;
2115 MpegEncContext *s = &ctx->m;
2117 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2118 if (s->codec_tag == AV_RL32("XVID") ||
2119 s->codec_tag == AV_RL32("XVIX") ||
2120 s->codec_tag == AV_RL32("RMP4") ||
2121 s->codec_tag == AV_RL32("ZMP4") ||
2122 s->codec_tag == AV_RL32("SIPP"))
2123 ctx->xvid_build = 0;
2126 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2127 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2128 ctx->vol_control_parameters == 0)
2129 ctx->divx_version = 400; // divx 4
2131 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2133 ctx->divx_build = -1;
2136 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2137 if (s->codec_tag == AV_RL32("XVIX"))
2138 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2140 if (s->codec_tag == AV_RL32("UMP4"))
2141 s->workaround_bugs |= FF_BUG_UMP4;
2143 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2144 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2146 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2147 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2149 if (ctx->xvid_build <= 3U)
2150 s->padding_bug_score = 256 * 256 * 256 * 64;
2152 if (ctx->xvid_build <= 1U)
2153 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2155 if (ctx->xvid_build <= 12U)
2156 s->workaround_bugs |= FF_BUG_EDGE;
2158 if (ctx->xvid_build <= 32U)
2159 s->workaround_bugs |= FF_BUG_DC_CLIP;
2161 #define SET_QPEL_FUNC(postfix1, postfix2) \
2162 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2163 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2164 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2166 if (ctx->lavc_build < 4653U)
2167 s->workaround_bugs |= FF_BUG_STD_QPEL;
2169 if (ctx->lavc_build < 4655U)
2170 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2172 if (ctx->lavc_build < 4670U)
2173 s->workaround_bugs |= FF_BUG_EDGE;
2175 if (ctx->lavc_build <= 4712U)
2176 s->workaround_bugs |= FF_BUG_DC_CLIP;
2178 if (ctx->divx_version >= 0)
2179 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2180 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2181 s->padding_bug_score = 256 * 256 * 256 * 64;
2183 if (ctx->divx_version < 500U)
2184 s->workaround_bugs |= FF_BUG_EDGE;
2186 if (ctx->divx_version >= 0)
2187 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2190 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2191 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2192 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2193 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2194 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2195 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2196 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2198 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2199 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2200 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2201 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2202 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2203 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2206 if (avctx->debug & FF_DEBUG_BUGS)
2207 av_log(s->avctx, AV_LOG_DEBUG,
2208 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2209 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2210 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2212 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2213 s->codec_id == AV_CODEC_ID_MPEG4 &&
2214 avctx->idct_algo == FF_IDCT_AUTO) {
2215 avctx->idct_algo = FF_IDCT_XVID;
2216 ff_mpv_idct_init(s);
2223 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2225 MpegEncContext *s = &ctx->m;
2226 int time_incr, time_increment;
2229 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2230 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2231 ctx->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2232 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2236 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2237 if (s->partitioned_frame)
2238 s->decode_mb = mpeg4_decode_partitioned_mb;
2240 s->decode_mb = mpeg4_decode_mb;
2243 while (get_bits1(gb) != 0)
2246 check_marker(gb, "before time_increment");
2248 if (ctx->time_increment_bits == 0 ||
2249 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2250 av_log(s->avctx, AV_LOG_ERROR,
2251 "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2253 for (ctx->time_increment_bits = 1;
2254 ctx->time_increment_bits < 16;
2255 ctx->time_increment_bits++) {
2256 if (s->pict_type == AV_PICTURE_TYPE_P ||
2257 (s->pict_type == AV_PICTURE_TYPE_S &&
2258 ctx->vol_sprite_usage == GMC_SPRITE)) {
2259 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2261 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2265 av_log(s->avctx, AV_LOG_ERROR,
2266 "my guess is %d bits ;)\n", ctx->time_increment_bits);
2267 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2268 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2269 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2274 time_increment = get_bits1(gb); // FIXME investigate further
2276 time_increment = get_bits(gb, ctx->time_increment_bits);
2278 if (s->pict_type != AV_PICTURE_TYPE_B) {
2279 s->last_time_base = s->time_base;
2280 s->time_base += time_incr;
2281 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2282 if (s->workaround_bugs & FF_BUG_UMP4) {
2283 if (s->time < s->last_non_b_time) {
2284 /* header is not mpeg-4-compatible, broken encoder,
2285 * trying to workaround */
2287 s->time += s->avctx->framerate.num;
2290 s->pp_time = s->time - s->last_non_b_time;
2291 s->last_non_b_time = s->time;
2293 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2294 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2295 if (s->pp_time <= s->pb_time ||
2296 s->pp_time <= s->pp_time - s->pb_time ||
2298 /* messed up order, maybe after seeking? skipping current b-frame */
2299 return FRAME_SKIPPED;
2301 ff_mpeg4_init_direct_mv(s);
2303 if (ctx->t_frame == 0)
2304 ctx->t_frame = s->pb_time;
2305 if (ctx->t_frame == 0)
2306 ctx->t_frame = 1; // 1/0 protection
2307 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2308 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2309 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2310 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2311 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2312 s->pb_field_time = 2;
2313 s->pp_field_time = 4;
2314 if (!s->progressive_sequence)
2315 return FRAME_SKIPPED;
2319 if (s->avctx->framerate.den)
2320 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2322 pts = AV_NOPTS_VALUE;
2323 if (s->avctx->debug&FF_DEBUG_PTS)
2324 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2327 check_marker(gb, "before vop_coded");
2330 if (get_bits1(gb) != 1) {
2331 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2332 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2333 return FRAME_SKIPPED;
2336 decode_new_pred(ctx, gb);
2338 if (ctx->shape != BIN_ONLY_SHAPE &&
2339 (s->pict_type == AV_PICTURE_TYPE_P ||
2340 (s->pict_type == AV_PICTURE_TYPE_S &&
2341 ctx->vol_sprite_usage == GMC_SPRITE))) {
2342 /* rounding type for motion estimation */
2343 s->no_rounding = get_bits1(gb);
2347 // FIXME reduced res stuff
2349 if (ctx->shape != RECT_SHAPE) {
2350 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2351 skip_bits(gb, 13); /* width */
2352 skip_bits1(gb); /* marker */
2353 skip_bits(gb, 13); /* height */
2354 skip_bits1(gb); /* marker */
2355 skip_bits(gb, 13); /* hor_spat_ref */
2356 skip_bits1(gb); /* marker */
2357 skip_bits(gb, 13); /* ver_spat_ref */
2359 skip_bits1(gb); /* change_CR_disable */
2361 if (get_bits1(gb) != 0)
2362 skip_bits(gb, 8); /* constant_alpha_value */
2365 // FIXME complexity estimation stuff
2367 if (ctx->shape != BIN_ONLY_SHAPE) {
2368 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2369 if (s->pict_type != AV_PICTURE_TYPE_I)
2370 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2371 if (s->pict_type == AV_PICTURE_TYPE_B)
2372 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2374 if (get_bits_left(gb) < 3) {
2375 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2376 return AVERROR_INVALIDDATA;
2378 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2379 if (!s->progressive_sequence) {
2380 s->top_field_first = get_bits1(gb);
2381 s->alternate_scan = get_bits1(gb);
2383 s->alternate_scan = 0;
2386 if (s->alternate_scan) {
2387 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2388 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2389 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2390 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2392 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2393 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2394 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2395 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2398 if (s->pict_type == AV_PICTURE_TYPE_S &&
2399 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2400 ctx->vol_sprite_usage == GMC_SPRITE)) {
2401 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2402 return AVERROR_INVALIDDATA;
2403 if (ctx->sprite_brightness_change)
2404 av_log(s->avctx, AV_LOG_ERROR,
2405 "sprite_brightness_change not supported\n");
2406 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2407 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2410 if (ctx->shape != BIN_ONLY_SHAPE) {
2411 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2412 if (s->qscale == 0) {
2413 av_log(s->avctx, AV_LOG_ERROR,
2414 "Error, header damaged or not MPEG4 header (qscale=0)\n");
2415 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2418 if (s->pict_type != AV_PICTURE_TYPE_I) {
2419 s->f_code = get_bits(gb, 3); /* fcode_for */
2420 if (s->f_code == 0) {
2421 av_log(s->avctx, AV_LOG_ERROR,
2422 "Error, header damaged or not MPEG4 header (f_code=0)\n");
2424 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2429 if (s->pict_type == AV_PICTURE_TYPE_B) {
2430 s->b_code = get_bits(gb, 3);
2431 if (s->b_code == 0) {
2432 av_log(s->avctx, AV_LOG_ERROR,
2433 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2435 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2440 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2441 av_log(s->avctx, AV_LOG_DEBUG,
2442 "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",
2443 s->qscale, s->f_code, s->b_code,
2444 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")),
2445 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2446 s->top_field_first, s->quarter_sample ? "q" : "h",
2447 s->data_partitioning, ctx->resync_marker,
2448 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2449 1 - s->no_rounding, s->vo_type,
2450 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2451 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2452 ctx->cplx_estimation_trash_b,
2458 if (!ctx->scalability) {
2459 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2460 skip_bits1(gb); // vop shape coding type
2462 if (ctx->enhancement_type) {
2463 int load_backward_shape = get_bits1(gb);
2464 if (load_backward_shape)
2465 av_log(s->avctx, AV_LOG_ERROR,
2466 "load backward shape isn't supported\n");
2468 skip_bits(gb, 2); // ref_select_code
2471 /* detect buggy encoders which don't set the low_delay flag
2472 * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2473 * easily (although it's buggy too) */
2474 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2475 ctx->divx_version == -1 && s->picture_number == 0) {
2476 av_log(s->avctx, AV_LOG_WARNING,
2477 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2481 s->picture_number++; // better than pic number==0 always ;)
2483 // FIXME add short header support
2484 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2485 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2487 if (s->workaround_bugs & FF_BUG_EDGE) {
2488 s->h_edge_pos = s->width;
2489 s->v_edge_pos = s->height;
2495 * Decode mpeg4 headers.
2496 * @return <0 if no VOP found (or a damaged one)
2497 * FRAME_SKIPPED if a not coded VOP is found
2498 * 0 if a VOP is found
2500 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2502 MpegEncContext *s = &ctx->m;
2503 unsigned startcode, v;
2506 /* search next start code */
2509 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2511 if (get_bits(gb, 8) == 0xF0)
2517 if (get_bits_count(gb) >= gb->size_in_bits) {
2518 if (gb->size_in_bits == 8 &&
2519 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2520 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2521 return FRAME_SKIPPED; // divx bug
2523 return -1; // end of stream
2526 /* use the bits after the test */
2527 v = get_bits(gb, 8);
2528 startcode = ((startcode << 8) | v) & 0xffffffff;
2530 if ((startcode & 0xFFFFFF00) != 0x100)
2531 continue; // no startcode
2533 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2534 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2535 if (startcode <= 0x11F)
2536 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2537 else if (startcode <= 0x12F)
2538 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2539 else if (startcode <= 0x13F)
2540 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2541 else if (startcode <= 0x15F)
2542 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2543 else if (startcode <= 0x1AF)
2544 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2545 else if (startcode == 0x1B0)
2546 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2547 else if (startcode == 0x1B1)
2548 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2549 else if (startcode == 0x1B2)
2550 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2551 else if (startcode == 0x1B3)
2552 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2553 else if (startcode == 0x1B4)
2554 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2555 else if (startcode == 0x1B5)
2556 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2557 else if (startcode == 0x1B6)
2558 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2559 else if (startcode == 0x1B7)
2560 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2561 else if (startcode == 0x1B8)
2562 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2563 else if (startcode == 0x1B9)
2564 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2565 else if (startcode == 0x1BA)
2566 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2567 else if (startcode == 0x1BB)
2568 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2569 else if (startcode == 0x1BC)
2570 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2571 else if (startcode == 0x1BD)
2572 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2573 else if (startcode == 0x1BE)
2574 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2575 else if (startcode == 0x1BF)
2576 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2577 else if (startcode == 0x1C0)
2578 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2579 else if (startcode == 0x1C1)
2580 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2581 else if (startcode == 0x1C2)
2582 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2583 else if (startcode == 0x1C3)
2584 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2585 else if (startcode <= 0x1C5)
2586 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2587 else if (startcode <= 0x1FF)
2588 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2589 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2592 if (startcode >= 0x120 && startcode <= 0x12F) {
2593 if ((ret = decode_vol_header(ctx, gb)) < 0)
2595 } else if (startcode == USER_DATA_STARTCODE) {
2596 decode_user_data(ctx, gb);
2597 } else if (startcode == GOP_STARTCODE) {
2598 mpeg4_decode_gop_header(s, gb);
2599 } else if (startcode == VOS_STARTCODE) {
2600 mpeg4_decode_profile_level(s, gb);
2601 } else if (startcode == VOP_STARTCODE) {
2610 if (s->flags & CODEC_FLAG_LOW_DELAY)
2612 s->avctx->has_b_frames = !s->low_delay;
2614 return decode_vop_header(ctx, gb);
2617 av_cold void ff_mpeg4videodec_static_init(void) {
2618 static int done = 0;
2621 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2622 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2623 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2624 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2625 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2626 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2627 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2628 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2629 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2630 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2631 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2632 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2633 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2634 &ff_sprite_trajectory_tab[0][1], 4, 2,
2635 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2636 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2637 &ff_mb_type_b_tab[0][1], 2, 1,
2638 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2643 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2645 Mpeg4DecContext *ctx = avctx->priv_data;
2646 MpegEncContext *s = &ctx->m;
2648 /* divx 5.01+ bitstream reorder stuff */
2649 /* Since this clobbers the input buffer and hwaccel codecs still need the
2650 * data during hwaccel->end_frame we should not do this any earlier */
2651 if (s->divx_packed) {
2652 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2653 int startcode_found = 0;
2655 if (buf_size - current_pos > 7) {
2658 for (i = current_pos; i < buf_size - 4; i++)
2663 buf[i + 3] == 0xB6) {
2664 startcode_found = !(buf[i + 4] & 0x40);
2669 if (startcode_found) {
2670 av_fast_padded_malloc(&s->bitstream_buffer,
2671 &s->allocated_bitstream_buffer_size,
2672 buf_size - current_pos);
2673 if (!s->bitstream_buffer)
2674 return AVERROR(ENOMEM);
2675 memcpy(s->bitstream_buffer, buf + current_pos,
2676 buf_size - current_pos);
2677 s->bitstream_buffer_size = buf_size - current_pos;
2684 static int mpeg4_update_thread_context(AVCodecContext *dst,
2685 const AVCodecContext *src)
2687 Mpeg4DecContext *s = dst->priv_data;
2688 const Mpeg4DecContext *s1 = src->priv_data;
2689 int init = s->m.context_initialized;
2691 int ret = ff_mpeg_update_thread_context(dst, src);
2696 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2698 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2699 ff_xvid_idct_init(&s->m.idsp, dst);
2704 static av_cold int decode_init(AVCodecContext *avctx)
2706 Mpeg4DecContext *ctx = avctx->priv_data;
2707 MpegEncContext *s = &ctx->m;
2713 ctx->lavc_build = -1;
2715 if ((ret = ff_h263_decode_init(avctx)) < 0)
2718 ff_mpeg4videodec_static_init();
2721 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2722 s->decode_mb = mpeg4_decode_mb;
2723 ctx->time_increment_bits = 4; /* default value for broken headers */
2725 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2726 avctx->internal->allocate_progress = 1;
2731 static const AVProfile mpeg4_video_profiles[] = {
2732 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2733 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2734 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2735 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2736 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2737 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2738 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2739 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2740 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2741 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2742 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2743 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2744 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2745 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2746 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2747 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2748 { FF_PROFILE_UNKNOWN },
2751 static const AVOption mpeg4_options[] = {
2752 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2753 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2757 static const AVClass mpeg4_class = {
2758 "MPEG4 Video Decoder",
2759 av_default_item_name,
2761 LIBAVUTIL_VERSION_INT,
2764 AVCodec ff_mpeg4_decoder = {
2766 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2767 .type = AVMEDIA_TYPE_VIDEO,
2768 .id = AV_CODEC_ID_MPEG4,
2769 .priv_data_size = sizeof(Mpeg4DecContext),
2770 .init = decode_init,
2771 .close = ff_h263_decode_end,
2772 .decode = ff_h263_decode_frame,
2773 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2774 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2775 CODEC_CAP_FRAME_THREADS,
2776 .flush = ff_mpeg_flush,
2778 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2779 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2780 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2781 .priv_class = &mpeg4_class,
2785 #if CONFIG_MPEG4_VDPAU_DECODER
2786 static const AVClass mpeg4_vdpau_class = {
2787 "MPEG4 Video VDPAU Decoder",
2788 av_default_item_name,
2790 LIBAVUTIL_VERSION_INT,
2793 AVCodec ff_mpeg4_vdpau_decoder = {
2794 .name = "mpeg4_vdpau",
2795 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2796 .type = AVMEDIA_TYPE_VIDEO,
2797 .id = AV_CODEC_ID_MPEG4,
2798 .priv_data_size = sizeof(Mpeg4DecContext),
2799 .init = decode_init,
2800 .close = ff_h263_decode_end,
2801 .decode = ff_h263_decode_frame,
2802 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2803 CODEC_CAP_HWACCEL_VDPAU,
2804 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2806 .priv_class = &mpeg4_vdpau_class,