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 "mpegvideodata.h"
32 #include "mpeg4video.h"
37 /* The defines below define the number of bits that are read at once for
38 * reading vlc values. Changing these may improve speed and data cache needs
39 * be aware though that decreasing them may need the number of stages that is
40 * passed to get_vlc* to be increased. */
41 #define SPRITE_TRAJ_VLC_BITS 6
43 #define MB_TYPE_B_VLC_BITS 4
45 static VLC dc_lum, dc_chrom;
46 static VLC sprite_trajectory;
47 static VLC mb_type_b_vlc;
49 static const int mb_type_b_map[4] = {
50 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
51 MB_TYPE_L0L1 | MB_TYPE_16x16,
52 MB_TYPE_L1 | MB_TYPE_16x16,
53 MB_TYPE_L0 | MB_TYPE_16x16,
58 * @param n block index (0-3 are luma, 4-5 are chroma)
59 * @param dir the ac prediction direction
61 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
64 int16_t *ac_val, *ac_val1;
65 int8_t *const qscale_table = s->current_picture.qscale_table;
68 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
72 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
76 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
79 for (i = 1; i < 8; i++)
80 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
82 /* different qscale, we must rescale */
83 for (i = 1; i < 8; i++)
84 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
87 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
89 ac_val -= 16 * s->block_wrap[n];
91 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
94 for (i = 1; i < 8; i++)
95 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
97 /* different qscale, we must rescale */
98 for (i = 1; i < 8; i++)
99 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
104 for (i = 1; i < 8; i++)
105 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
108 for (i = 1; i < 8; i++)
109 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
113 * check if the next stuff is a resync marker or the end.
116 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
118 MpegEncContext *s = &ctx->m;
119 int bits_count = get_bits_count(&s->gb);
120 int v = show_bits(&s->gb, 16);
122 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
126 if (s->pict_type == AV_PICTURE_TYPE_B ||
127 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
129 skip_bits(&s->gb, 8 + s->pict_type);
130 bits_count += 8 + s->pict_type;
131 v = show_bits(&s->gb, 16);
134 if (bits_count + 8 >= s->gb.size_in_bits) {
136 v |= 0x7F >> (7 - (bits_count & 7));
141 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
143 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
144 GetBitContext gb = s->gb;
146 skip_bits(&s->gb, 1);
147 align_get_bits(&s->gb);
149 for (len = 0; len < 32; len++)
150 if (get_bits1(&s->gb))
153 mb_num = get_bits(&s->gb, mb_num_bits);
154 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
159 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
166 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
168 MpegEncContext *s = &ctx->m;
169 int a = 2 << s->sprite_warping_accuracy;
170 int rho = 3 - s->sprite_warping_accuracy;
176 int min_ab, i, w2, h2, w3, h3;
177 int sprite_ref[4][2];
178 int virtual_ref[2][2];
180 // only true for rectangle shapes
181 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
182 { 0, s->height }, { s->width, s->height } };
183 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
185 if (w <= 0 || h <= 0)
186 return AVERROR_INVALIDDATA;
188 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
192 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
194 x = get_xbits(gb, length);
196 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
197 check_marker(gb, "before sprite_trajectory");
199 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
201 y = get_xbits(gb, length);
203 check_marker(gb, "after sprite_trajectory");
204 ctx->sprite_traj[i][0] = d[i][0] = x;
205 ctx->sprite_traj[i][1] = d[i][1] = y;
208 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
210 while ((1 << alpha) < w)
212 while ((1 << beta) < h)
213 beta++; /* typo in the mpeg4 std for the definition of w' and h' */
217 // Note, the 4th point isn't used for GMC
218 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
219 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
220 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
221 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
222 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
223 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
224 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
226 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
227 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
228 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
229 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
230 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
231 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
233 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
234 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
236 /* this is mostly identical to the mpeg4 std (and is totally unreadable
237 * because of that...). Perhaps it should be reordered to be more readable.
238 * The idea behind this virtual_ref mess is to be able to use shifts later
239 * per pixel instead of divides so the distance between points is converted
240 * from w&h based to w2&h2 based which are of the 2^x form. */
241 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
242 ROUNDED_DIV(((w - w2) *
243 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
244 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
245 virtual_ref[0][1] = 16 * vop_ref[0][1] +
246 ROUNDED_DIV(((w - w2) *
247 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
248 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
249 virtual_ref[1][0] = 16 * vop_ref[0][0] +
250 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
251 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
252 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
253 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
254 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
256 switch (ctx->num_sprite_warping_points) {
258 s->sprite_offset[0][0] =
259 s->sprite_offset[0][1] =
260 s->sprite_offset[1][0] =
261 s->sprite_offset[1][1] = 0;
262 s->sprite_delta[0][0] = a;
263 s->sprite_delta[0][1] =
264 s->sprite_delta[1][0] = 0;
265 s->sprite_delta[1][1] = a;
266 ctx->sprite_shift[0] =
267 ctx->sprite_shift[1] = 0;
270 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
271 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
272 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
273 a * (vop_ref[0][0] / 2);
274 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
275 a * (vop_ref[0][1] / 2);
276 s->sprite_delta[0][0] = a;
277 s->sprite_delta[0][1] =
278 s->sprite_delta[1][0] = 0;
279 s->sprite_delta[1][1] = a;
280 ctx->sprite_shift[0] =
281 ctx->sprite_shift[1] = 0;
284 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
285 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
287 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
288 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
289 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
290 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
292 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
293 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
294 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295 (-2 * vop_ref[0][0] + 1) +
296 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
297 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
298 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
299 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
300 (-2 * vop_ref[0][0] + 1) +
301 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
302 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
303 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
304 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
305 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
306 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
307 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
309 ctx->sprite_shift[0] = alpha + rho;
310 ctx->sprite_shift[1] = alpha + rho + 2;
313 min_ab = FFMIN(alpha, beta);
316 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
317 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
318 h3 * (-vop_ref[0][0]) +
319 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
320 w3 * (-vop_ref[0][1]) +
321 (1 << (alpha + beta + rho - min_ab - 1));
322 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
323 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
324 h3 * (-vop_ref[0][0]) +
325 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
326 w3 * (-vop_ref[0][1]) +
327 (1 << (alpha + beta + rho - min_ab - 1));
328 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
329 h3 * (-2 * vop_ref[0][0] + 1) +
330 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
331 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
332 r * sprite_ref[0][0] - 16 * w2 * h3 +
333 (1 << (alpha + beta + rho - min_ab + 1));
334 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
335 h3 * (-2 * vop_ref[0][0] + 1) +
336 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
337 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
338 r * sprite_ref[0][1] - 16 * w2 * h3 +
339 (1 << (alpha + beta + rho - min_ab + 1));
340 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
341 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
342 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
343 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
345 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
346 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
349 /* try to simplify the situation */
350 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
351 s->sprite_delta[0][1] == 0 &&
352 s->sprite_delta[1][0] == 0 &&
353 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
354 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
355 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
356 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
357 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
358 s->sprite_delta[0][0] = a;
359 s->sprite_delta[0][1] = 0;
360 s->sprite_delta[1][0] = 0;
361 s->sprite_delta[1][1] = a;
362 ctx->sprite_shift[0] = 0;
363 ctx->sprite_shift[1] = 0;
364 s->real_sprite_warping_points = 1;
366 int shift_y = 16 - ctx->sprite_shift[0];
367 int shift_c = 16 - ctx->sprite_shift[1];
368 for (i = 0; i < 2; i++) {
369 s->sprite_offset[0][i] <<= shift_y;
370 s->sprite_offset[1][i] <<= shift_c;
371 s->sprite_delta[0][i] <<= shift_y;
372 s->sprite_delta[1][i] <<= shift_y;
373 ctx->sprite_shift[i] = 16;
375 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
381 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
382 int len = FFMIN(ctx->time_increment_bits + 3, 15);
387 check_marker(gb, "after new_pred");
393 * Decode the next video packet.
394 * @return <0 if something went wrong
396 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
398 MpegEncContext *s = &ctx->m;
400 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
401 int header_extension = 0, mb_num, len;
403 /* is there enough space left for a video packet + header */
404 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
407 for (len = 0; len < 32; len++)
408 if (get_bits1(&s->gb))
411 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
412 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
416 if (ctx->shape != RECT_SHAPE) {
417 header_extension = get_bits1(&s->gb);
418 // FIXME more stuff here
421 mb_num = get_bits(&s->gb, mb_num_bits);
422 if (mb_num >= s->mb_num) {
423 av_log(s->avctx, AV_LOG_ERROR,
424 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
428 s->mb_x = mb_num % s->mb_width;
429 s->mb_y = mb_num / s->mb_width;
431 if (ctx->shape != BIN_ONLY_SHAPE) {
432 int qscale = get_bits(&s->gb, s->quant_precision);
434 s->chroma_qscale = s->qscale = qscale;
437 if (ctx->shape == RECT_SHAPE)
438 header_extension = get_bits1(&s->gb);
440 if (header_extension) {
443 while (get_bits1(&s->gb) != 0)
446 check_marker(&s->gb, "before time_increment in video packed header");
447 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
448 check_marker(&s->gb, "before vop_coding_type in video packed header");
450 skip_bits(&s->gb, 2); /* vop coding type */
451 // FIXME not rect stuff here
453 if (ctx->shape != BIN_ONLY_SHAPE) {
454 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
455 // FIXME don't just ignore everything
456 if (s->pict_type == AV_PICTURE_TYPE_S &&
457 ctx->vol_sprite_usage == GMC_SPRITE) {
458 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
459 return AVERROR_INVALIDDATA;
460 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
463 // FIXME reduced res stuff here
465 if (s->pict_type != AV_PICTURE_TYPE_I) {
466 int f_code = get_bits(&s->gb, 3); /* fcode_for */
468 av_log(s->avctx, AV_LOG_ERROR,
469 "Error, video packet header damaged (f_code=0)\n");
471 if (s->pict_type == AV_PICTURE_TYPE_B) {
472 int b_code = get_bits(&s->gb, 3);
474 av_log(s->avctx, AV_LOG_ERROR,
475 "Error, video packet header damaged (b_code=0)\n");
480 decode_new_pred(ctx, &s->gb);
486 * Get the average motion vector for a GMC MB.
487 * @param n either 0 for the x component or 1 for y
488 * @return the average MV for a GMC MB
490 static inline int get_amv(Mpeg4DecContext *ctx, int n)
492 MpegEncContext *s = &ctx->m;
493 int x, y, mb_v, sum, dx, dy, shift;
494 int len = 1 << (s->f_code + 4);
495 const int a = s->sprite_warping_accuracy;
497 if (s->workaround_bugs & FF_BUG_AMV)
498 len >>= s->quarter_sample;
500 if (s->real_sprite_warping_points == 1) {
501 if (ctx->divx_version == 500 && ctx->divx_build == 413)
502 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
504 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
506 dx = s->sprite_delta[n][0];
507 dy = s->sprite_delta[n][1];
508 shift = ctx->sprite_shift[0];
510 dy -= 1 << (shift + a + 1);
512 dx -= 1 << (shift + a + 1);
513 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
516 for (y = 0; y < 16; y++) {
521 for (x = 0; x < 16; x++) {
526 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
538 * Decode the dc value.
539 * @param n block index (0-3 are luma, 4-5 are chroma)
540 * @param dir_ptr the prediction direction will be stored here
541 * @return the quantized dc
543 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
548 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
550 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
552 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
553 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
562 level = 2 * get_bits1(&s->gb) - 1;
564 if (get_bits1(&s->gb))
565 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
567 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
570 level = get_xbits(&s->gb, code);
574 if (get_bits1(&s->gb) == 0) { /* marker */
575 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
576 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
583 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
587 * Decode first partition.
588 * @return number of MBs decoded or <0 if an error occurred
590 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
592 MpegEncContext *s = &ctx->m;
594 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
596 /* decode first partition */
597 s->first_slice_line = 1;
598 for (; s->mb_y < s->mb_height; s->mb_y++) {
599 ff_init_block_index(s);
600 for (; s->mb_x < s->mb_width; s->mb_x++) {
601 const int xy = s->mb_x + s->mb_y * s->mb_stride;
606 ff_update_block_index(s);
607 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
608 s->first_slice_line = 0;
610 if (s->pict_type == AV_PICTURE_TYPE_I) {
614 if (show_bits_long(&s->gb, 19) == DC_MARKER)
617 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
619 av_log(s->avctx, AV_LOG_ERROR,
620 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
625 s->cbp_table[xy] = cbpc & 3;
626 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
630 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
632 s->current_picture.qscale_table[xy] = s->qscale;
634 s->mbintra_table[xy] = 1;
635 for (i = 0; i < 6; i++) {
637 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
639 av_log(s->avctx, AV_LOG_ERROR,
640 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
647 s->pred_dir_table[xy] = dir;
648 } else { /* P/S_TYPE */
649 int mx, my, pred_x, pred_y, bits;
650 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
651 const int stride = s->b8_stride * 2;
654 bits = show_bits(&s->gb, 17);
655 if (bits == MOTION_MARKER)
659 if (bits & 0x10000) {
661 if (s->pict_type == AV_PICTURE_TYPE_S &&
662 ctx->vol_sprite_usage == GMC_SPRITE) {
663 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
667 mx = get_amv(ctx, 0);
668 my = get_amv(ctx, 1);
670 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
677 mot_val[0 + stride] =
678 mot_val[2 + stride] = mx;
681 mot_val[1 + stride] =
682 mot_val[3 + stride] = my;
684 if (s->mbintra_table[xy])
685 ff_clean_intra_table_entries(s);
689 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
691 av_log(s->avctx, AV_LOG_ERROR,
692 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
698 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
700 s->mb_intra = ((cbpc & 4) != 0);
703 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
704 s->mbintra_table[xy] = 1;
707 mot_val[0 + stride] =
708 mot_val[2 + stride] = 0;
711 mot_val[1 + stride] =
712 mot_val[3 + stride] = 0;
714 if (s->mbintra_table[xy])
715 ff_clean_intra_table_entries(s);
717 if (s->pict_type == AV_PICTURE_TYPE_S &&
718 ctx->vol_sprite_usage == GMC_SPRITE &&
720 s->mcsel = get_bits1(&s->gb);
724 if ((cbpc & 16) == 0) {
725 /* 16x16 motion prediction */
727 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
729 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
733 my = ff_h263_decode_motion(s, pred_y, s->f_code);
736 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
739 mx = get_amv(ctx, 0);
740 my = get_amv(ctx, 1);
741 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
748 mot_val[0 + stride] =
749 mot_val[2 + stride] = mx;
752 mot_val[1 + stride] =
753 mot_val[3 + stride] = my;
756 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
758 for (i = 0; i < 4; i++) {
759 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
760 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
764 my = ff_h263_decode_motion(s, pred_y, s->f_code);
781 * decode second partition.
782 * @return <0 if an error occurred
784 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
787 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
789 s->mb_x = s->resync_mb_x;
790 s->first_slice_line = 1;
791 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
792 ff_init_block_index(s);
793 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
794 const int xy = s->mb_x + s->mb_y * s->mb_stride;
797 ff_update_block_index(s);
798 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
799 s->first_slice_line = 0;
801 if (s->pict_type == AV_PICTURE_TYPE_I) {
802 int ac_pred = get_bits1(&s->gb);
803 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
805 av_log(s->avctx, AV_LOG_ERROR,
806 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
810 s->cbp_table[xy] |= cbpy << 2;
811 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
812 } else { /* P || S_TYPE */
813 if (IS_INTRA(s->current_picture.mb_type[xy])) {
816 int ac_pred = get_bits1(&s->gb);
817 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
820 av_log(s->avctx, AV_LOG_ERROR,
821 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
825 if (s->cbp_table[xy] & 8)
826 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
827 s->current_picture.qscale_table[xy] = s->qscale;
829 for (i = 0; i < 6; i++) {
831 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
833 av_log(s->avctx, AV_LOG_ERROR,
834 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
841 s->cbp_table[xy] &= 3; // remove dquant
842 s->cbp_table[xy] |= cbpy << 2;
843 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
844 s->pred_dir_table[xy] = dir;
845 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
846 s->current_picture.qscale_table[xy] = s->qscale;
847 s->cbp_table[xy] = 0;
849 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
852 av_log(s->avctx, AV_LOG_ERROR,
853 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
857 if (s->cbp_table[xy] & 8)
858 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
859 s->current_picture.qscale_table[xy] = s->qscale;
861 s->cbp_table[xy] &= 3; // remove dquant
862 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
866 if (mb_num >= mb_count)
874 * Decode the first and second partition.
875 * @return <0 if error (and sets error type in the error_status_table)
877 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
879 MpegEncContext *s = &ctx->m;
881 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
882 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
884 mb_num = mpeg4_decode_partition_a(ctx);
886 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
887 s->mb_x, s->mb_y, part_a_error);
891 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
892 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
893 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
894 s->mb_x, s->mb_y, part_a_error);
898 s->mb_num_left = mb_num;
900 if (s->pict_type == AV_PICTURE_TYPE_I) {
901 while (show_bits(&s->gb, 9) == 1)
902 skip_bits(&s->gb, 9);
903 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
904 av_log(s->avctx, AV_LOG_ERROR,
905 "marker missing after first I partition at %d %d\n",
910 while (show_bits(&s->gb, 10) == 1)
911 skip_bits(&s->gb, 10);
912 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
913 av_log(s->avctx, AV_LOG_ERROR,
914 "marker missing after first P partition at %d %d\n",
919 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
920 s->mb_x - 1, s->mb_y, part_a_end);
922 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
923 if (s->pict_type == AV_PICTURE_TYPE_P)
924 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
925 s->mb_x, s->mb_y, ER_DC_ERROR);
928 if (s->pict_type == AV_PICTURE_TYPE_P)
929 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
930 s->mb_x - 1, s->mb_y, ER_DC_END);
938 * @return <0 if an error occurred
940 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
941 int n, int coded, int intra, int rvlc)
943 MpegEncContext *s = &ctx->m;
944 int level, i, last, run, qmul, qadd;
945 int av_uninit(dc_pred_dir);
948 const uint8_t *scan_table;
950 // Note intra & rvlc should be optimized away if this is inlined
953 if (ctx->use_intra_dc_vlc) {
955 if (s->partitioned_frame) {
956 level = s->dc_val[0][s->block_index[n]];
958 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
960 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
961 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
963 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
971 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
977 rl = &ff_rvlc_rl_intra;
978 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
980 rl = &ff_mpeg4_rl_intra;
981 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
984 if (dc_pred_dir == 0)
985 scan_table = s->intra_v_scantable.permutated; /* left */
987 scan_table = s->intra_h_scantable.permutated; /* top */
989 scan_table = s->intra_scantable.permutated;
996 s->block_last_index[n] = i;
1000 rl = &ff_rvlc_rl_inter;
1002 rl = &ff_h263_rl_inter;
1004 scan_table = s->intra_scantable.permutated;
1006 if (s->mpeg_quant) {
1010 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1012 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1014 qmul = s->qscale << 1;
1015 qadd = (s->qscale - 1) | 1;
1017 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1019 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1023 OPEN_READER(re, &s->gb);
1025 UPDATE_CACHE(re, &s->gb);
1026 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1030 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1031 av_log(s->avctx, AV_LOG_ERROR,
1032 "1. marker bit missing in rvlc esc\n");
1035 SKIP_CACHE(re, &s->gb, 1);
1037 last = SHOW_UBITS(re, &s->gb, 1);
1038 SKIP_CACHE(re, &s->gb, 1);
1039 run = SHOW_UBITS(re, &s->gb, 6);
1040 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1041 UPDATE_CACHE(re, &s->gb);
1043 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1044 av_log(s->avctx, AV_LOG_ERROR,
1045 "2. marker bit missing in rvlc esc\n");
1048 SKIP_CACHE(re, &s->gb, 1);
1050 level = SHOW_UBITS(re, &s->gb, 11);
1051 SKIP_CACHE(re, &s->gb, 11);
1053 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1054 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1057 SKIP_CACHE(re, &s->gb, 5);
1059 level = level * qmul + qadd;
1060 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1061 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1068 cache = GET_CACHE(re, &s->gb);
1071 cache ^= 0xC0000000;
1073 if (cache & 0x80000000) {
1074 if (cache & 0x40000000) {
1076 SKIP_CACHE(re, &s->gb, 2);
1077 last = SHOW_UBITS(re, &s->gb, 1);
1078 SKIP_CACHE(re, &s->gb, 1);
1079 run = SHOW_UBITS(re, &s->gb, 6);
1080 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1081 UPDATE_CACHE(re, &s->gb);
1084 level = SHOW_SBITS(re, &s->gb, 12);
1085 LAST_SKIP_BITS(re, &s->gb, 12);
1087 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1088 av_log(s->avctx, AV_LOG_ERROR,
1089 "1. marker bit missing in 3. esc\n");
1090 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1093 SKIP_CACHE(re, &s->gb, 1);
1095 level = SHOW_SBITS(re, &s->gb, 12);
1096 SKIP_CACHE(re, &s->gb, 12);
1098 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1099 av_log(s->avctx, AV_LOG_ERROR,
1100 "2. marker bit missing in 3. esc\n");
1101 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1105 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1109 if (s->error_recognition >= FF_ER_COMPLIANT) {
1110 const int abs_level= FFABS(level);
1111 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1112 const int run1= run - rl->max_run[last][abs_level] - 1;
1113 if (abs_level <= rl->max_level[last][run]) {
1114 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1117 if (s->error_recognition > FF_ER_COMPLIANT) {
1118 if (abs_level <= rl->max_level[last][run]*2) {
1119 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1122 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1123 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1131 level = level * qmul + qadd;
1133 level = level * qmul - qadd;
1135 if ((unsigned)(level + 2048) > 4095) {
1136 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1137 if (level > 2560 || level < -2560) {
1138 av_log(s->avctx, AV_LOG_ERROR,
1139 "|level| overflow in 3. esc, qp=%d\n",
1144 level = level < 0 ? -2048 : 2047;
1152 SKIP_BITS(re, &s->gb, 2);
1153 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1154 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1155 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1156 LAST_SKIP_BITS(re, &s->gb, 1);
1160 SKIP_BITS(re, &s->gb, 1);
1161 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1163 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1164 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1165 LAST_SKIP_BITS(re, &s->gb, 1);
1170 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1171 LAST_SKIP_BITS(re, &s->gb, 1);
1173 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1177 av_log(s->avctx, AV_LOG_ERROR,
1178 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1182 block[scan_table[i]] = level;
1186 block[scan_table[i]] = level;
1188 CLOSE_READER(re, &s->gb);
1193 if (!ctx->use_intra_dc_vlc) {
1194 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1196 i -= i >> 31; // if (i == -1) i = 0;
1199 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1201 i = 63; // FIXME not optimal
1203 s->block_last_index[n] = i;
1208 * decode partition C of one MB.
1209 * @return <0 if an error occurred
1211 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1213 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1215 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1217 mb_type = s->current_picture.mb_type[xy];
1218 cbp = s->cbp_table[xy];
1220 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1222 if (s->current_picture.qscale_table[xy] != s->qscale)
1223 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1225 if (s->pict_type == AV_PICTURE_TYPE_P ||
1226 s->pict_type == AV_PICTURE_TYPE_S) {
1228 for (i = 0; i < 4; i++) {
1229 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1230 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1232 s->mb_intra = IS_INTRA(mb_type);
1234 if (IS_SKIP(mb_type)) {
1236 for (i = 0; i < 6; i++)
1237 s->block_last_index[i] = -1;
1238 s->mv_dir = MV_DIR_FORWARD;
1239 s->mv_type = MV_TYPE_16X16;
1240 if (s->pict_type == AV_PICTURE_TYPE_S
1241 && ctx->vol_sprite_usage == GMC_SPRITE) {
1248 } else if (s->mb_intra) {
1249 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1250 } else if (!s->mb_intra) {
1251 // s->mcsel = 0; // FIXME do we need to init that?
1253 s->mv_dir = MV_DIR_FORWARD;
1254 if (IS_8X8(mb_type)) {
1255 s->mv_type = MV_TYPE_8X8;
1257 s->mv_type = MV_TYPE_16X16;
1260 } else { /* I-Frame */
1262 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1265 if (!IS_SKIP(mb_type)) {
1267 s->bdsp.clear_blocks(s->block[0]);
1268 /* decode each block */
1269 for (i = 0; i < 6; i++) {
1270 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1271 av_log(s->avctx, AV_LOG_ERROR,
1272 "texture corrupted at %d %d %d\n",
1273 s->mb_x, s->mb_y, s->mb_intra);
1280 /* per-MB end of slice check */
1281 if (--s->mb_num_left <= 0) {
1282 if (mpeg4_is_resync(ctx))
1287 if (mpeg4_is_resync(ctx)) {
1288 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1289 if (s->cbp_table[xy + delta])
1296 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1298 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1299 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1301 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1302 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1304 av_assert2(s->h263_pred);
1306 if (s->pict_type == AV_PICTURE_TYPE_P ||
1307 s->pict_type == AV_PICTURE_TYPE_S) {
1309 if (get_bits1(&s->gb)) {
1312 for (i = 0; i < 6; i++)
1313 s->block_last_index[i] = -1;
1314 s->mv_dir = MV_DIR_FORWARD;
1315 s->mv_type = MV_TYPE_16X16;
1316 if (s->pict_type == AV_PICTURE_TYPE_S &&
1317 ctx->vol_sprite_usage == GMC_SPRITE) {
1318 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1323 s->mv[0][0][0] = get_amv(ctx, 0);
1324 s->mv[0][0][1] = get_amv(ctx, 1);
1327 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1337 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1339 av_log(s->avctx, AV_LOG_ERROR,
1340 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1343 } while (cbpc == 20);
1345 s->bdsp.clear_blocks(s->block[0]);
1347 s->mb_intra = ((cbpc & 4) != 0);
1351 if (s->pict_type == AV_PICTURE_TYPE_S &&
1352 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1353 s->mcsel = get_bits1(&s->gb);
1356 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1358 cbp = (cbpc & 3) | (cbpy << 2);
1360 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1361 if ((!s->progressive_sequence) &&
1362 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1363 s->interlaced_dct = get_bits1(&s->gb);
1365 s->mv_dir = MV_DIR_FORWARD;
1366 if ((cbpc & 16) == 0) {
1368 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1371 /* 16x16 global motion prediction */
1372 s->mv_type = MV_TYPE_16X16;
1373 mx = get_amv(ctx, 0);
1374 my = get_amv(ctx, 1);
1375 s->mv[0][0][0] = mx;
1376 s->mv[0][0][1] = my;
1377 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1378 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1381 /* 16x8 field motion prediction */
1382 s->mv_type = MV_TYPE_FIELD;
1384 s->field_select[0][0] = get_bits1(&s->gb);
1385 s->field_select[0][1] = get_bits1(&s->gb);
1387 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1389 for (i = 0; i < 2; i++) {
1390 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1394 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1398 s->mv[0][i][0] = mx;
1399 s->mv[0][i][1] = my;
1402 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1403 /* 16x16 motion prediction */
1404 s->mv_type = MV_TYPE_16X16;
1405 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1406 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1411 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1415 s->mv[0][0][0] = mx;
1416 s->mv[0][0][1] = my;
1419 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1420 s->mv_type = MV_TYPE_8X8;
1421 for (i = 0; i < 4; i++) {
1422 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1423 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1427 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1430 s->mv[0][i][0] = mx;
1431 s->mv[0][i][1] = my;
1436 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1437 int modb1; // first bit of modb
1438 int modb2; // second bit of modb
1441 s->mb_intra = 0; // B-frames never contain intra blocks
1442 s->mcsel = 0; // ... true gmc blocks
1445 for (i = 0; i < 2; i++) {
1446 s->last_mv[i][0][0] =
1447 s->last_mv[i][0][1] =
1448 s->last_mv[i][1][0] =
1449 s->last_mv[i][1][1] = 0;
1452 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1455 /* if we skipped it in the future P Frame than skip it now too */
1456 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1458 if (s->mb_skipped) {
1460 for (i = 0; i < 6; i++)
1461 s->block_last_index[i] = -1;
1463 s->mv_dir = MV_DIR_FORWARD;
1464 s->mv_type = MV_TYPE_16X16;
1469 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1475 modb1 = get_bits1(&s->gb);
1477 // like MB_TYPE_B_DIRECT but no vectors coded
1478 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1481 modb2 = get_bits1(&s->gb);
1482 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1484 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1487 mb_type = mb_type_b_map[mb_type];
1491 s->bdsp.clear_blocks(s->block[0]);
1492 cbp = get_bits(&s->gb, 6);
1495 if ((!IS_DIRECT(mb_type)) && cbp) {
1496 if (get_bits1(&s->gb))
1497 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1500 if (!s->progressive_sequence) {
1502 s->interlaced_dct = get_bits1(&s->gb);
1504 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1505 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1506 mb_type &= ~MB_TYPE_16x16;
1508 if (USES_LIST(mb_type, 0)) {
1509 s->field_select[0][0] = get_bits1(&s->gb);
1510 s->field_select[0][1] = get_bits1(&s->gb);
1512 if (USES_LIST(mb_type, 1)) {
1513 s->field_select[1][0] = get_bits1(&s->gb);
1514 s->field_select[1][1] = get_bits1(&s->gb);
1520 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1521 s->mv_type = MV_TYPE_16X16;
1523 if (USES_LIST(mb_type, 0)) {
1524 s->mv_dir = MV_DIR_FORWARD;
1526 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1527 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1528 s->last_mv[0][1][0] =
1529 s->last_mv[0][0][0] =
1530 s->mv[0][0][0] = mx;
1531 s->last_mv[0][1][1] =
1532 s->last_mv[0][0][1] =
1533 s->mv[0][0][1] = my;
1536 if (USES_LIST(mb_type, 1)) {
1537 s->mv_dir |= MV_DIR_BACKWARD;
1539 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1540 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1541 s->last_mv[1][1][0] =
1542 s->last_mv[1][0][0] =
1543 s->mv[1][0][0] = mx;
1544 s->last_mv[1][1][1] =
1545 s->last_mv[1][0][1] =
1546 s->mv[1][0][1] = my;
1548 } else if (!IS_DIRECT(mb_type)) {
1549 s->mv_type = MV_TYPE_FIELD;
1551 if (USES_LIST(mb_type, 0)) {
1552 s->mv_dir = MV_DIR_FORWARD;
1554 for (i = 0; i < 2; i++) {
1555 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1556 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1557 s->last_mv[0][i][0] =
1558 s->mv[0][i][0] = mx;
1559 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1563 if (USES_LIST(mb_type, 1)) {
1564 s->mv_dir |= MV_DIR_BACKWARD;
1566 for (i = 0; i < 2; i++) {
1567 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1568 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1569 s->last_mv[1][i][0] =
1570 s->mv[1][i][0] = mx;
1571 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1577 if (IS_DIRECT(mb_type)) {
1578 if (IS_SKIP(mb_type)) {
1582 mx = ff_h263_decode_motion(s, 0, 1);
1583 my = ff_h263_decode_motion(s, 0, 1);
1586 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1587 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1589 s->current_picture.mb_type[xy] = mb_type;
1590 } else { /* I-Frame */
1592 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1594 av_log(s->avctx, AV_LOG_ERROR,
1595 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1598 } while (cbpc == 8);
1604 s->ac_pred = get_bits1(&s->gb);
1606 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1608 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1610 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1612 av_log(s->avctx, AV_LOG_ERROR,
1613 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1616 cbp = (cbpc & 3) | (cbpy << 2);
1618 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1621 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1623 if (!s->progressive_sequence)
1624 s->interlaced_dct = get_bits1(&s->gb);
1626 s->bdsp.clear_blocks(s->block[0]);
1627 /* decode each block */
1628 for (i = 0; i < 6; i++) {
1629 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1636 /* decode each block */
1637 for (i = 0; i < 6; i++) {
1638 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1644 /* per-MB end of slice check */
1645 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1646 int next = mpeg4_is_resync(ctx);
1648 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1650 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1653 if (s->pict_type == AV_PICTURE_TYPE_B) {
1654 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1655 ff_thread_await_progress(&s->next_picture_ptr->tf,
1656 (s->mb_x + delta >= s->mb_width)
1657 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1659 if (s->next_picture.mbskip_table[xy + delta])
1670 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1672 int hours, minutes, seconds;
1674 if (!show_bits(gb, 23)) {
1675 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1679 hours = get_bits(gb, 5);
1680 minutes = get_bits(gb, 6);
1681 check_marker(gb, "in gop_header");
1682 seconds = get_bits(gb, 6);
1684 s->time_base = seconds + 60*(minutes + 60*hours);
1692 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1695 s->avctx->profile = get_bits(gb, 4);
1696 s->avctx->level = get_bits(gb, 4);
1698 // for Simple profile, level 0
1699 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1700 s->avctx->level = 0;
1706 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1708 MpegEncContext *s = &ctx->m;
1709 int width, height, vo_ver_id;
1712 skip_bits(gb, 1); /* random access */
1713 s->vo_type = get_bits(gb, 8);
1714 if (get_bits1(gb) != 0) { /* is_ol_id */
1715 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1716 skip_bits(gb, 3); /* vo_priority */
1720 s->aspect_ratio_info = get_bits(gb, 4);
1721 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1722 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1723 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1725 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1728 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1729 int chroma_format = get_bits(gb, 2);
1730 if (chroma_format != CHROMA_420)
1731 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1733 s->low_delay = get_bits1(gb);
1734 if (get_bits1(gb)) { /* vbv parameters */
1735 get_bits(gb, 15); /* first_half_bitrate */
1736 check_marker(gb, "after first_half_bitrate");
1737 get_bits(gb, 15); /* latter_half_bitrate */
1738 check_marker(gb, "after latter_half_bitrate");
1739 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1740 check_marker(gb, "after first_half_vbv_buffer_size");
1741 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1742 get_bits(gb, 11); /* first_half_vbv_occupancy */
1743 check_marker(gb, "after first_half_vbv_occupancy");
1744 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1745 check_marker(gb, "after latter_half_vbv_occupancy");
1748 /* is setting low delay flag only once the smartest thing to do?
1749 * low delay detection won't be overridden. */
1750 if (s->picture_number == 0)
1754 ctx->shape = get_bits(gb, 2); /* vol shape */
1755 if (ctx->shape != RECT_SHAPE)
1756 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1757 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1758 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1759 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1762 check_marker(gb, "before time_increment_resolution");
1764 s->avctx->framerate.num = get_bits(gb, 16);
1765 if (!s->avctx->framerate.num) {
1766 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1767 return AVERROR_INVALIDDATA;
1770 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1771 if (ctx->time_increment_bits < 1)
1772 ctx->time_increment_bits = 1;
1774 check_marker(gb, "before fixed_vop_rate");
1776 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1777 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1779 s->avctx->framerate.den = 1;
1781 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1785 if (ctx->shape != BIN_ONLY_SHAPE) {
1786 if (ctx->shape == RECT_SHAPE) {
1787 check_marker(gb, "before width");
1788 width = get_bits(gb, 13);
1789 check_marker(gb, "before height");
1790 height = get_bits(gb, 13);
1791 check_marker(gb, "after height");
1792 if (width && height && /* they should be non zero but who knows */
1793 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1794 if (s->width && s->height &&
1795 (s->width != width || s->height != height))
1796 s->context_reinit = 1;
1802 s->progressive_sequence =
1803 s->progressive_frame = get_bits1(gb) ^ 1;
1804 s->interlaced_dct = 0;
1805 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1806 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1807 "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1809 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1811 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1813 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1814 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1815 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1816 ctx->vol_sprite_usage == GMC_SPRITE) {
1817 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1818 skip_bits(gb, 13); // sprite_width
1819 check_marker(gb, "after sprite_width");
1820 skip_bits(gb, 13); // sprite_height
1821 check_marker(gb, "after sprite_height");
1822 skip_bits(gb, 13); // sprite_left
1823 check_marker(gb, "after sprite_left");
1824 skip_bits(gb, 13); // sprite_top
1825 check_marker(gb, "after sprite_top");
1827 ctx->num_sprite_warping_points = get_bits(gb, 6);
1828 if (ctx->num_sprite_warping_points > 3) {
1829 av_log(s->avctx, AV_LOG_ERROR,
1830 "%d sprite_warping_points\n",
1831 ctx->num_sprite_warping_points);
1832 ctx->num_sprite_warping_points = 0;
1833 return AVERROR_INVALIDDATA;
1835 s->sprite_warping_accuracy = get_bits(gb, 2);
1836 ctx->sprite_brightness_change = get_bits1(gb);
1837 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1838 skip_bits1(gb); // low_latency_sprite
1840 // FIXME sadct disable bit if verid!=1 && shape not rect
1842 if (get_bits1(gb) == 1) { /* not_8_bit */
1843 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1844 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1845 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1846 if (s->quant_precision != 5)
1847 av_log(s->avctx, AV_LOG_ERROR,
1848 "quant precision %d\n", s->quant_precision);
1849 if (s->quant_precision<3 || s->quant_precision>9) {
1850 s->quant_precision = 5;
1853 s->quant_precision = 5;
1856 // FIXME a bunch of grayscale shape things
1858 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1861 /* load default matrixes */
1862 for (i = 0; i < 64; i++) {
1863 int j = s->idsp.idct_permutation[i];
1864 v = ff_mpeg4_default_intra_matrix[i];
1865 s->intra_matrix[j] = v;
1866 s->chroma_intra_matrix[j] = v;
1868 v = ff_mpeg4_default_non_intra_matrix[i];
1869 s->inter_matrix[j] = v;
1870 s->chroma_inter_matrix[j] = v;
1873 /* load custom intra matrix */
1874 if (get_bits1(gb)) {
1876 for (i = 0; i < 64; i++) {
1878 v = get_bits(gb, 8);
1883 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1884 s->intra_matrix[j] = last;
1885 s->chroma_intra_matrix[j] = last;
1888 /* replicate last value */
1889 for (; i < 64; i++) {
1890 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1891 s->intra_matrix[j] = last;
1892 s->chroma_intra_matrix[j] = last;
1896 /* load custom non intra matrix */
1897 if (get_bits1(gb)) {
1899 for (i = 0; i < 64; i++) {
1901 v = get_bits(gb, 8);
1906 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1907 s->inter_matrix[j] = v;
1908 s->chroma_inter_matrix[j] = v;
1911 /* replicate last value */
1912 for (; i < 64; i++) {
1913 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1914 s->inter_matrix[j] = last;
1915 s->chroma_inter_matrix[j] = last;
1919 // FIXME a bunch of grayscale shape things
1923 s->quarter_sample = get_bits1(gb);
1925 s->quarter_sample = 0;
1927 if (get_bits_left(gb) < 4) {
1928 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1929 return AVERROR_INVALIDDATA;
1932 if (!get_bits1(gb)) {
1933 int pos = get_bits_count(gb);
1934 int estimation_method = get_bits(gb, 2);
1935 if (estimation_method < 2) {
1936 if (!get_bits1(gb)) {
1937 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1938 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1939 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1940 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1941 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1942 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1944 if (!get_bits1(gb)) {
1945 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1946 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1947 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1948 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1950 if (!check_marker(gb, "in complexity estimation part 1")) {
1951 skip_bits_long(gb, pos - get_bits_count(gb));
1954 if (!get_bits1(gb)) {
1955 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1956 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1957 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1958 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1960 if (!get_bits1(gb)) {
1961 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1962 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1963 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1964 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1965 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1966 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1968 if (!check_marker(gb, "in complexity estimation part 2")) {
1969 skip_bits_long(gb, pos - get_bits_count(gb));
1972 if (estimation_method == 1) {
1973 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1974 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1977 av_log(s->avctx, AV_LOG_ERROR,
1978 "Invalid Complexity estimation method %d\n",
1983 ctx->cplx_estimation_trash_i =
1984 ctx->cplx_estimation_trash_p =
1985 ctx->cplx_estimation_trash_b = 0;
1988 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1990 s->data_partitioning = get_bits1(gb);
1991 if (s->data_partitioning)
1992 ctx->rvlc = get_bits1(gb);
1994 if (vo_ver_id != 1) {
1995 ctx->new_pred = get_bits1(gb);
1996 if (ctx->new_pred) {
1997 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1998 skip_bits(gb, 2); /* requested upstream message type */
1999 skip_bits1(gb); /* newpred segment type */
2001 if (get_bits1(gb)) // reduced_res_vop
2002 av_log(s->avctx, AV_LOG_ERROR,
2003 "reduced resolution VOP not supported\n");
2008 ctx->scalability = get_bits1(gb);
2010 if (ctx->scalability) {
2011 GetBitContext bak = *gb;
2012 int h_sampling_factor_n;
2013 int h_sampling_factor_m;
2014 int v_sampling_factor_n;
2015 int v_sampling_factor_m;
2017 skip_bits1(gb); // hierarchy_type
2018 skip_bits(gb, 4); /* ref_layer_id */
2019 skip_bits1(gb); /* ref_layer_sampling_dir */
2020 h_sampling_factor_n = get_bits(gb, 5);
2021 h_sampling_factor_m = get_bits(gb, 5);
2022 v_sampling_factor_n = get_bits(gb, 5);
2023 v_sampling_factor_m = get_bits(gb, 5);
2024 ctx->enhancement_type = get_bits1(gb);
2026 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2027 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2028 /* illegal scalability header (VERY broken encoder),
2029 * trying to workaround */
2030 ctx->scalability = 0;
2033 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2035 // bin shape stuff FIXME
2039 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2040 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2041 s->avctx->framerate.den, s->avctx->framerate.num,
2042 ctx->time_increment_bits,
2044 s->progressive_sequence,
2045 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2046 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2054 * Decode the user data stuff in the header.
2055 * Also initializes divx/xvid/lavc_version/build.
2057 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2059 MpegEncContext *s = &ctx->m;
2063 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2066 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2067 if (show_bits(gb, 23) == 0)
2069 buf[i] = get_bits(gb, 8);
2073 /* divx detection */
2074 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2076 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2078 ctx->divx_version = ver;
2079 ctx->divx_build = build;
2080 s->divx_packed = e == 3 && last == 'p';
2083 /* libavcodec detection */
2084 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2086 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2088 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2090 build = (ver << 16) + (ver2 << 8) + ver3;
2093 if (strcmp(buf, "ffmpeg") == 0)
2094 ctx->lavc_build = 4600;
2097 ctx->lavc_build = build;
2099 /* Xvid detection */
2100 e = sscanf(buf, "XviD%d", &build);
2102 ctx->xvid_build = build;
2107 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2109 Mpeg4DecContext *ctx = avctx->priv_data;
2110 MpegEncContext *s = &ctx->m;
2112 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2113 if (s->codec_tag == AV_RL32("XVID") ||
2114 s->codec_tag == AV_RL32("XVIX") ||
2115 s->codec_tag == AV_RL32("RMP4") ||
2116 s->codec_tag == AV_RL32("ZMP4") ||
2117 s->codec_tag == AV_RL32("SIPP"))
2118 ctx->xvid_build = 0;
2121 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2122 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2123 ctx->vol_control_parameters == 0)
2124 ctx->divx_version = 400; // divx 4
2126 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2128 ctx->divx_build = -1;
2131 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2132 if (s->codec_tag == AV_RL32("XVIX"))
2133 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2135 if (s->codec_tag == AV_RL32("UMP4"))
2136 s->workaround_bugs |= FF_BUG_UMP4;
2138 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2139 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2141 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2142 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2144 if (ctx->xvid_build <= 3U)
2145 s->padding_bug_score = 256 * 256 * 256 * 64;
2147 if (ctx->xvid_build <= 1U)
2148 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2150 if (ctx->xvid_build <= 12U)
2151 s->workaround_bugs |= FF_BUG_EDGE;
2153 if (ctx->xvid_build <= 32U)
2154 s->workaround_bugs |= FF_BUG_DC_CLIP;
2156 #define SET_QPEL_FUNC(postfix1, postfix2) \
2157 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2158 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2159 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2161 if (ctx->lavc_build < 4653U)
2162 s->workaround_bugs |= FF_BUG_STD_QPEL;
2164 if (ctx->lavc_build < 4655U)
2165 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2167 if (ctx->lavc_build < 4670U)
2168 s->workaround_bugs |= FF_BUG_EDGE;
2170 if (ctx->lavc_build <= 4712U)
2171 s->workaround_bugs |= FF_BUG_DC_CLIP;
2173 if (ctx->divx_version >= 0)
2174 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2175 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2176 s->padding_bug_score = 256 * 256 * 256 * 64;
2178 if (ctx->divx_version < 500U)
2179 s->workaround_bugs |= FF_BUG_EDGE;
2181 if (ctx->divx_version >= 0)
2182 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2185 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2186 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2187 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2188 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2189 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2190 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2191 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2193 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2194 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2195 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2196 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2197 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2198 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2201 if (avctx->debug & FF_DEBUG_BUGS)
2202 av_log(s->avctx, AV_LOG_DEBUG,
2203 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2204 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2205 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2207 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2208 s->codec_id == AV_CODEC_ID_MPEG4 &&
2209 avctx->idct_algo == FF_IDCT_AUTO) {
2210 avctx->idct_algo = FF_IDCT_XVID;
2211 ff_mpv_idct_init(s);
2218 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2220 MpegEncContext *s = &ctx->m;
2221 int time_incr, time_increment;
2224 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2225 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2226 ctx->vol_control_parameters == 0 && !(s->avctx->flags & CODEC_FLAG_LOW_DELAY)) {
2227 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2231 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2232 if (s->partitioned_frame)
2233 s->decode_mb = mpeg4_decode_partitioned_mb;
2235 s->decode_mb = mpeg4_decode_mb;
2238 while (get_bits1(gb) != 0)
2241 check_marker(gb, "before time_increment");
2243 if (ctx->time_increment_bits == 0 ||
2244 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2245 av_log(s->avctx, AV_LOG_WARNING,
2246 "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);
2248 for (ctx->time_increment_bits = 1;
2249 ctx->time_increment_bits < 16;
2250 ctx->time_increment_bits++) {
2251 if (s->pict_type == AV_PICTURE_TYPE_P ||
2252 (s->pict_type == AV_PICTURE_TYPE_S &&
2253 ctx->vol_sprite_usage == GMC_SPRITE)) {
2254 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2256 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2260 av_log(s->avctx, AV_LOG_WARNING,
2261 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2262 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2263 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2264 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2269 time_increment = get_bits1(gb); // FIXME investigate further
2271 time_increment = get_bits(gb, ctx->time_increment_bits);
2273 if (s->pict_type != AV_PICTURE_TYPE_B) {
2274 s->last_time_base = s->time_base;
2275 s->time_base += time_incr;
2276 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2277 if (s->workaround_bugs & FF_BUG_UMP4) {
2278 if (s->time < s->last_non_b_time) {
2279 /* header is not mpeg-4-compatible, broken encoder,
2280 * trying to workaround */
2282 s->time += s->avctx->framerate.num;
2285 s->pp_time = s->time - s->last_non_b_time;
2286 s->last_non_b_time = s->time;
2288 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2289 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2290 if (s->pp_time <= s->pb_time ||
2291 s->pp_time <= s->pp_time - s->pb_time ||
2293 /* messed up order, maybe after seeking? skipping current b-frame */
2294 return FRAME_SKIPPED;
2296 ff_mpeg4_init_direct_mv(s);
2298 if (ctx->t_frame == 0)
2299 ctx->t_frame = s->pb_time;
2300 if (ctx->t_frame == 0)
2301 ctx->t_frame = 1; // 1/0 protection
2302 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2303 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2304 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2305 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2306 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2307 s->pb_field_time = 2;
2308 s->pp_field_time = 4;
2309 if (!s->progressive_sequence)
2310 return FRAME_SKIPPED;
2314 if (s->avctx->framerate.den)
2315 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2317 pts = AV_NOPTS_VALUE;
2318 if (s->avctx->debug&FF_DEBUG_PTS)
2319 av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
2322 check_marker(gb, "before vop_coded");
2325 if (get_bits1(gb) != 1) {
2326 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2327 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2328 return FRAME_SKIPPED;
2331 decode_new_pred(ctx, gb);
2333 if (ctx->shape != BIN_ONLY_SHAPE &&
2334 (s->pict_type == AV_PICTURE_TYPE_P ||
2335 (s->pict_type == AV_PICTURE_TYPE_S &&
2336 ctx->vol_sprite_usage == GMC_SPRITE))) {
2337 /* rounding type for motion estimation */
2338 s->no_rounding = get_bits1(gb);
2342 // FIXME reduced res stuff
2344 if (ctx->shape != RECT_SHAPE) {
2345 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2346 skip_bits(gb, 13); /* width */
2347 check_marker(gb, "after width");
2348 skip_bits(gb, 13); /* height */
2349 check_marker(gb, "after height");
2350 skip_bits(gb, 13); /* hor_spat_ref */
2351 check_marker(gb, "after hor_spat_ref");
2352 skip_bits(gb, 13); /* ver_spat_ref */
2354 skip_bits1(gb); /* change_CR_disable */
2356 if (get_bits1(gb) != 0)
2357 skip_bits(gb, 8); /* constant_alpha_value */
2360 // FIXME complexity estimation stuff
2362 if (ctx->shape != BIN_ONLY_SHAPE) {
2363 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2364 if (s->pict_type != AV_PICTURE_TYPE_I)
2365 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2366 if (s->pict_type == AV_PICTURE_TYPE_B)
2367 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2369 if (get_bits_left(gb) < 3) {
2370 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2371 return AVERROR_INVALIDDATA;
2373 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2374 if (!s->progressive_sequence) {
2375 s->top_field_first = get_bits1(gb);
2376 s->alternate_scan = get_bits1(gb);
2378 s->alternate_scan = 0;
2381 if (s->alternate_scan) {
2382 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2383 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2384 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2385 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2387 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2388 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2389 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2390 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2393 if (s->pict_type == AV_PICTURE_TYPE_S &&
2394 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2395 ctx->vol_sprite_usage == GMC_SPRITE)) {
2396 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2397 return AVERROR_INVALIDDATA;
2398 if (ctx->sprite_brightness_change)
2399 av_log(s->avctx, AV_LOG_ERROR,
2400 "sprite_brightness_change not supported\n");
2401 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2402 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2405 if (ctx->shape != BIN_ONLY_SHAPE) {
2406 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2407 if (s->qscale == 0) {
2408 av_log(s->avctx, AV_LOG_ERROR,
2409 "Error, header damaged or not MPEG4 header (qscale=0)\n");
2410 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2413 if (s->pict_type != AV_PICTURE_TYPE_I) {
2414 s->f_code = get_bits(gb, 3); /* fcode_for */
2415 if (s->f_code == 0) {
2416 av_log(s->avctx, AV_LOG_ERROR,
2417 "Error, header damaged or not MPEG4 header (f_code=0)\n");
2419 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2424 if (s->pict_type == AV_PICTURE_TYPE_B) {
2425 s->b_code = get_bits(gb, 3);
2426 if (s->b_code == 0) {
2427 av_log(s->avctx, AV_LOG_ERROR,
2428 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2430 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2435 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2436 av_log(s->avctx, AV_LOG_DEBUG,
2437 "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",
2438 s->qscale, s->f_code, s->b_code,
2439 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")),
2440 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2441 s->top_field_first, s->quarter_sample ? "q" : "h",
2442 s->data_partitioning, ctx->resync_marker,
2443 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2444 1 - s->no_rounding, s->vo_type,
2445 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2446 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2447 ctx->cplx_estimation_trash_b,
2453 if (!ctx->scalability) {
2454 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2455 skip_bits1(gb); // vop shape coding type
2457 if (ctx->enhancement_type) {
2458 int load_backward_shape = get_bits1(gb);
2459 if (load_backward_shape)
2460 av_log(s->avctx, AV_LOG_ERROR,
2461 "load backward shape isn't supported\n");
2463 skip_bits(gb, 2); // ref_select_code
2466 /* detect buggy encoders which don't set the low_delay flag
2467 * (divx4/xvid/opendivx). Note we cannot detect divx5 without b-frames
2468 * easily (although it's buggy too) */
2469 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2470 ctx->divx_version == -1 && s->picture_number == 0) {
2471 av_log(s->avctx, AV_LOG_WARNING,
2472 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2476 s->picture_number++; // better than pic number==0 always ;)
2478 // FIXME add short header support
2479 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2480 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2482 if (s->workaround_bugs & FF_BUG_EDGE) {
2483 s->h_edge_pos = s->width;
2484 s->v_edge_pos = s->height;
2490 * Decode mpeg4 headers.
2491 * @return <0 if no VOP found (or a damaged one)
2492 * FRAME_SKIPPED if a not coded VOP is found
2493 * 0 if a VOP is found
2495 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2497 MpegEncContext *s = &ctx->m;
2498 unsigned startcode, v;
2501 /* search next start code */
2504 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2506 if (get_bits(gb, 8) == 0xF0)
2512 if (get_bits_count(gb) >= gb->size_in_bits) {
2513 if (gb->size_in_bits == 8 &&
2514 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2515 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2516 return FRAME_SKIPPED; // divx bug
2518 return -1; // end of stream
2521 /* use the bits after the test */
2522 v = get_bits(gb, 8);
2523 startcode = ((startcode << 8) | v) & 0xffffffff;
2525 if ((startcode & 0xFFFFFF00) != 0x100)
2526 continue; // no startcode
2528 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2529 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2530 if (startcode <= 0x11F)
2531 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2532 else if (startcode <= 0x12F)
2533 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2534 else if (startcode <= 0x13F)
2535 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2536 else if (startcode <= 0x15F)
2537 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2538 else if (startcode <= 0x1AF)
2539 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2540 else if (startcode == 0x1B0)
2541 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2542 else if (startcode == 0x1B1)
2543 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2544 else if (startcode == 0x1B2)
2545 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2546 else if (startcode == 0x1B3)
2547 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2548 else if (startcode == 0x1B4)
2549 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2550 else if (startcode == 0x1B5)
2551 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2552 else if (startcode == 0x1B6)
2553 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2554 else if (startcode == 0x1B7)
2555 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2556 else if (startcode == 0x1B8)
2557 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2558 else if (startcode == 0x1B9)
2559 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2560 else if (startcode == 0x1BA)
2561 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2562 else if (startcode == 0x1BB)
2563 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2564 else if (startcode == 0x1BC)
2565 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2566 else if (startcode == 0x1BD)
2567 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2568 else if (startcode == 0x1BE)
2569 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2570 else if (startcode == 0x1BF)
2571 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2572 else if (startcode == 0x1C0)
2573 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2574 else if (startcode == 0x1C1)
2575 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2576 else if (startcode == 0x1C2)
2577 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2578 else if (startcode == 0x1C3)
2579 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2580 else if (startcode <= 0x1C5)
2581 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2582 else if (startcode <= 0x1FF)
2583 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2584 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2587 if (startcode >= 0x120 && startcode <= 0x12F) {
2588 if ((ret = decode_vol_header(ctx, gb)) < 0)
2590 } else if (startcode == USER_DATA_STARTCODE) {
2591 decode_user_data(ctx, gb);
2592 } else if (startcode == GOP_STARTCODE) {
2593 mpeg4_decode_gop_header(s, gb);
2594 } else if (startcode == VOS_STARTCODE) {
2595 mpeg4_decode_profile_level(s, gb);
2596 } else if (startcode == VOP_STARTCODE) {
2605 if (s->avctx->flags & CODEC_FLAG_LOW_DELAY)
2607 s->avctx->has_b_frames = !s->low_delay;
2609 return decode_vop_header(ctx, gb);
2612 av_cold void ff_mpeg4videodec_static_init(void) {
2613 static int done = 0;
2616 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2617 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2618 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2619 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2620 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2621 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2622 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2623 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2624 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2625 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2626 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2627 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2628 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2629 &ff_sprite_trajectory_tab[0][1], 4, 2,
2630 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2631 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2632 &ff_mb_type_b_tab[0][1], 2, 1,
2633 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2638 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2640 Mpeg4DecContext *ctx = avctx->priv_data;
2641 MpegEncContext *s = &ctx->m;
2643 /* divx 5.01+ bitstream reorder stuff */
2644 /* Since this clobbers the input buffer and hwaccel codecs still need the
2645 * data during hwaccel->end_frame we should not do this any earlier */
2646 if (s->divx_packed) {
2647 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2648 int startcode_found = 0;
2650 if (buf_size - current_pos > 7) {
2653 for (i = current_pos; i < buf_size - 4; i++)
2658 buf[i + 3] == 0xB6) {
2659 startcode_found = !(buf[i + 4] & 0x40);
2664 if (startcode_found) {
2665 if (!ctx->showed_packed_warning) {
2666 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2667 "wasteful way to store B-frames ('packed B-frames'). "
2668 "Consider using the mpeg4_unpack_bframes bitstream filter to fix it.\n");
2669 ctx->showed_packed_warning = 1;
2671 av_fast_padded_malloc(&s->bitstream_buffer,
2672 &s->allocated_bitstream_buffer_size,
2673 buf_size - current_pos);
2674 if (!s->bitstream_buffer) {
2675 s->bitstream_buffer_size = 0;
2676 return AVERROR(ENOMEM);
2678 memcpy(s->bitstream_buffer, buf + current_pos,
2679 buf_size - current_pos);
2680 s->bitstream_buffer_size = buf_size - current_pos;
2687 static int mpeg4_update_thread_context(AVCodecContext *dst,
2688 const AVCodecContext *src)
2690 Mpeg4DecContext *s = dst->priv_data;
2691 const Mpeg4DecContext *s1 = src->priv_data;
2692 int init = s->m.context_initialized;
2694 int ret = ff_mpeg_update_thread_context(dst, src);
2699 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2701 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2702 ff_xvid_idct_init(&s->m.idsp, dst);
2707 static av_cold int decode_init(AVCodecContext *avctx)
2709 Mpeg4DecContext *ctx = avctx->priv_data;
2710 MpegEncContext *s = &ctx->m;
2716 ctx->lavc_build = -1;
2718 if ((ret = ff_h263_decode_init(avctx)) < 0)
2721 ff_mpeg4videodec_static_init();
2724 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2725 s->decode_mb = mpeg4_decode_mb;
2726 ctx->time_increment_bits = 4; /* default value for broken headers */
2728 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2729 avctx->internal->allocate_progress = 1;
2734 static const AVProfile mpeg4_video_profiles[] = {
2735 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2736 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2737 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2738 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2739 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2740 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2741 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2742 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2743 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2744 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2745 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2746 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2747 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2748 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2749 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2750 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2751 { FF_PROFILE_UNKNOWN },
2754 static const AVOption mpeg4_options[] = {
2755 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2756 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2760 static const AVClass mpeg4_class = {
2761 "MPEG4 Video Decoder",
2762 av_default_item_name,
2764 LIBAVUTIL_VERSION_INT,
2767 AVCodec ff_mpeg4_decoder = {
2769 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2770 .type = AVMEDIA_TYPE_VIDEO,
2771 .id = AV_CODEC_ID_MPEG4,
2772 .priv_data_size = sizeof(Mpeg4DecContext),
2773 .init = decode_init,
2774 .close = ff_h263_decode_end,
2775 .decode = ff_h263_decode_frame,
2776 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2777 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2778 CODEC_CAP_FRAME_THREADS,
2779 .flush = ff_mpeg_flush,
2781 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2782 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2783 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2784 .priv_class = &mpeg4_class,
2788 #if CONFIG_MPEG4_VDPAU_DECODER
2789 static const AVClass mpeg4_vdpau_class = {
2790 "MPEG4 Video VDPAU Decoder",
2791 av_default_item_name,
2793 LIBAVUTIL_VERSION_INT,
2796 AVCodec ff_mpeg4_vdpau_decoder = {
2797 .name = "mpeg4_vdpau",
2798 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2799 .type = AVMEDIA_TYPE_VIDEO,
2800 .id = AV_CODEC_ID_MPEG4,
2801 .priv_data_size = sizeof(Mpeg4DecContext),
2802 .init = decode_init,
2803 .close = ff_h263_decode_end,
2804 .decode = ff_h263_decode_frame,
2805 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2806 CODEC_CAP_HWACCEL_VDPAU,
2807 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2809 .priv_class = &mpeg4_vdpau_class,