3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
39 /* The defines below define the number of bits that are read at once for
40 * reading vlc values. Changing these may improve speed and data cache needs
41 * be aware though that decreasing them may need the number of stages that is
42 * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
45 #define MB_TYPE_B_VLC_BITS 4
47 static VLC dc_lum, dc_chrom;
48 static VLC sprite_trajectory;
49 static VLC mb_type_b_vlc;
51 static const int mb_type_b_map[4] = {
52 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
53 MB_TYPE_L0L1 | MB_TYPE_16x16,
54 MB_TYPE_L1 | MB_TYPE_16x16,
55 MB_TYPE_L0 | MB_TYPE_16x16,
60 * @param n block index (0-3 are luma, 4-5 are chroma)
61 * @param dir the ac prediction direction
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
66 int16_t *ac_val, *ac_val1;
67 int8_t *const qscale_table = s->current_picture.qscale_table;
70 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
74 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
78 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
81 for (i = 1; i < 8; i++)
82 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
84 /* different qscale, we must rescale */
85 for (i = 1; i < 8; i++)
86 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
89 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
91 ac_val -= 16 * s->block_wrap[n];
93 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
96 for (i = 1; i < 8; i++)
97 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
99 /* different qscale, we must rescale */
100 for (i = 1; i < 8; i++)
101 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
106 for (i = 1; i < 8; i++)
107 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
110 for (i = 1; i < 8; i++)
111 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
115 * check if the next stuff is a resync marker or the end.
118 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
120 MpegEncContext *s = &ctx->m;
121 int bits_count = get_bits_count(&s->gb);
122 int v = show_bits(&s->gb, 16);
124 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
128 if (s->pict_type == AV_PICTURE_TYPE_B ||
129 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
131 skip_bits(&s->gb, 8 + s->pict_type);
132 bits_count += 8 + s->pict_type;
133 v = show_bits(&s->gb, 16);
136 if (bits_count + 8 >= s->gb.size_in_bits) {
138 v |= 0x7F >> (7 - (bits_count & 7));
143 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
145 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146 GetBitContext gb = s->gb;
148 skip_bits(&s->gb, 1);
149 align_get_bits(&s->gb);
151 for (len = 0; len < 32; len++)
152 if (get_bits1(&s->gb))
155 mb_num = get_bits(&s->gb, mb_num_bits);
156 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
161 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
170 MpegEncContext *s = &ctx->m;
171 int a = 2 << s->sprite_warping_accuracy;
172 int rho = 3 - s->sprite_warping_accuracy;
178 int min_ab, i, w2, h2, w3, h3;
179 int sprite_ref[4][2];
180 int virtual_ref[2][2];
182 // only true for rectangle shapes
183 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
184 { 0, s->height }, { s->width, s->height } };
185 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
187 if (w <= 0 || h <= 0)
188 return AVERROR_INVALIDDATA;
190 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
194 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
196 x = get_xbits(gb, length);
198 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
199 check_marker(s->avctx, gb, "before sprite_trajectory");
201 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
203 y = get_xbits(gb, length);
205 check_marker(s->avctx, gb, "after sprite_trajectory");
206 ctx->sprite_traj[i][0] = d[i][0] = x;
207 ctx->sprite_traj[i][1] = d[i][1] = y;
210 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
212 while ((1 << alpha) < w)
214 while ((1 << beta) < h)
215 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
219 // Note, the 4th point isn't used for GMC
220 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
221 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
222 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
223 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
224 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
225 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
226 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
228 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
229 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
230 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
231 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
232 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
233 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
235 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
236 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
238 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
239 * because of that...). Perhaps it should be reordered to be more readable.
240 * The idea behind this virtual_ref mess is to be able to use shifts later
241 * per pixel instead of divides so the distance between points is converted
242 * from w&h based to w2&h2 based which are of the 2^x form. */
243 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
244 ROUNDED_DIV(((w - w2) *
245 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
246 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
247 virtual_ref[0][1] = 16 * vop_ref[0][1] +
248 ROUNDED_DIV(((w - w2) *
249 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
250 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
251 virtual_ref[1][0] = 16 * vop_ref[0][0] +
252 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
253 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
254 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
255 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
256 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
258 switch (ctx->num_sprite_warping_points) {
260 s->sprite_offset[0][0] =
261 s->sprite_offset[0][1] =
262 s->sprite_offset[1][0] =
263 s->sprite_offset[1][1] = 0;
264 s->sprite_delta[0][0] = a;
265 s->sprite_delta[0][1] =
266 s->sprite_delta[1][0] = 0;
267 s->sprite_delta[1][1] = a;
268 ctx->sprite_shift[0] =
269 ctx->sprite_shift[1] = 0;
272 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
273 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
274 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
275 a * (vop_ref[0][0] / 2);
276 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
277 a * (vop_ref[0][1] / 2);
278 s->sprite_delta[0][0] = a;
279 s->sprite_delta[0][1] =
280 s->sprite_delta[1][0] = 0;
281 s->sprite_delta[1][1] = a;
282 ctx->sprite_shift[0] =
283 ctx->sprite_shift[1] = 0;
286 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
287 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
290 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
292 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
294 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
296 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
297 (-2 * vop_ref[0][0] + 1) +
298 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
299 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
301 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
302 (-2 * vop_ref[0][0] + 1) +
303 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
305 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
306 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
308 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
309 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
311 ctx->sprite_shift[0] = alpha + rho;
312 ctx->sprite_shift[1] = alpha + rho + 2;
315 min_ab = FFMIN(alpha, beta);
318 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
319 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
320 h3 * (-vop_ref[0][0]) +
321 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
322 w3 * (-vop_ref[0][1]) +
323 (1 << (alpha + beta + rho - min_ab - 1));
324 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
325 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
326 h3 * (-vop_ref[0][0]) +
327 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
328 w3 * (-vop_ref[0][1]) +
329 (1 << (alpha + beta + rho - min_ab - 1));
330 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
331 h3 * (-2 * vop_ref[0][0] + 1) +
332 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
333 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
334 r * sprite_ref[0][0] - 16 * w2 * h3 +
335 (1 << (alpha + beta + rho - min_ab + 1));
336 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
337 h3 * (-2 * vop_ref[0][0] + 1) +
338 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
339 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
340 r * sprite_ref[0][1] - 16 * w2 * h3 +
341 (1 << (alpha + beta + rho - min_ab + 1));
342 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
343 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
344 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
345 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
347 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
348 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
351 /* try to simplify the situation */
352 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
353 s->sprite_delta[0][1] == 0 &&
354 s->sprite_delta[1][0] == 0 &&
355 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
356 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
357 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
358 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
359 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
360 s->sprite_delta[0][0] = a;
361 s->sprite_delta[0][1] = 0;
362 s->sprite_delta[1][0] = 0;
363 s->sprite_delta[1][1] = a;
364 ctx->sprite_shift[0] = 0;
365 ctx->sprite_shift[1] = 0;
366 s->real_sprite_warping_points = 1;
368 int shift_y = 16 - ctx->sprite_shift[0];
369 int shift_c = 16 - ctx->sprite_shift[1];
370 for (i = 0; i < 2; i++) {
371 s->sprite_offset[0][i] <<= shift_y;
372 s->sprite_offset[1][i] <<= shift_c;
373 s->sprite_delta[0][i] <<= shift_y;
374 s->sprite_delta[1][i] <<= shift_y;
375 ctx->sprite_shift[i] = 16;
377 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
383 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
384 MpegEncContext *s = &ctx->m;
385 int len = FFMIN(ctx->time_increment_bits + 3, 15);
390 check_marker(s->avctx, gb, "after new_pred");
396 * Decode the next video packet.
397 * @return <0 if something went wrong
399 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
401 MpegEncContext *s = &ctx->m;
403 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
404 int header_extension = 0, mb_num, len;
406 /* is there enough space left for a video packet + header */
407 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
410 for (len = 0; len < 32; len++)
411 if (get_bits1(&s->gb))
414 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
415 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
419 if (ctx->shape != RECT_SHAPE) {
420 header_extension = get_bits1(&s->gb);
421 // FIXME more stuff here
424 mb_num = get_bits(&s->gb, mb_num_bits);
425 if (mb_num >= s->mb_num) {
426 av_log(s->avctx, AV_LOG_ERROR,
427 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
431 s->mb_x = mb_num % s->mb_width;
432 s->mb_y = mb_num / s->mb_width;
434 if (ctx->shape != BIN_ONLY_SHAPE) {
435 int qscale = get_bits(&s->gb, s->quant_precision);
437 s->chroma_qscale = s->qscale = qscale;
440 if (ctx->shape == RECT_SHAPE)
441 header_extension = get_bits1(&s->gb);
443 if (header_extension) {
446 while (get_bits1(&s->gb) != 0)
449 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
450 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
451 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
453 skip_bits(&s->gb, 2); /* vop coding type */
454 // FIXME not rect stuff here
456 if (ctx->shape != BIN_ONLY_SHAPE) {
457 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
458 // FIXME don't just ignore everything
459 if (s->pict_type == AV_PICTURE_TYPE_S &&
460 ctx->vol_sprite_usage == GMC_SPRITE) {
461 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
462 return AVERROR_INVALIDDATA;
463 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
466 // FIXME reduced res stuff here
468 if (s->pict_type != AV_PICTURE_TYPE_I) {
469 int f_code = get_bits(&s->gb, 3); /* fcode_for */
471 av_log(s->avctx, AV_LOG_ERROR,
472 "Error, video packet header damaged (f_code=0)\n");
474 if (s->pict_type == AV_PICTURE_TYPE_B) {
475 int b_code = get_bits(&s->gb, 3);
477 av_log(s->avctx, AV_LOG_ERROR,
478 "Error, video packet header damaged (b_code=0)\n");
483 decode_new_pred(ctx, &s->gb);
489 * Get the average motion vector for a GMC MB.
490 * @param n either 0 for the x component or 1 for y
491 * @return the average MV for a GMC MB
493 static inline int get_amv(Mpeg4DecContext *ctx, int n)
495 MpegEncContext *s = &ctx->m;
496 int x, y, mb_v, sum, dx, dy, shift;
497 int len = 1 << (s->f_code + 4);
498 const int a = s->sprite_warping_accuracy;
500 if (s->workaround_bugs & FF_BUG_AMV)
501 len >>= s->quarter_sample;
503 if (s->real_sprite_warping_points == 1) {
504 if (ctx->divx_version == 500 && ctx->divx_build == 413)
505 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
507 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
509 dx = s->sprite_delta[n][0];
510 dy = s->sprite_delta[n][1];
511 shift = ctx->sprite_shift[0];
513 dy -= 1 << (shift + a + 1);
515 dx -= 1 << (shift + a + 1);
516 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
519 for (y = 0; y < 16; y++) {
524 for (x = 0; x < 16; x++) {
529 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
541 * Decode the dc value.
542 * @param n block index (0-3 are luma, 4-5 are chroma)
543 * @param dir_ptr the prediction direction will be stored here
544 * @return the quantized dc
546 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
551 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
553 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
555 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
556 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
565 level = 2 * get_bits1(&s->gb) - 1;
567 if (get_bits1(&s->gb))
568 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
570 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
573 level = get_xbits(&s->gb, code);
577 if (get_bits1(&s->gb) == 0) { /* marker */
578 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
579 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
586 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
590 * Decode first partition.
591 * @return number of MBs decoded or <0 if an error occurred
593 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
595 MpegEncContext *s = &ctx->m;
597 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
599 /* decode first partition */
600 s->first_slice_line = 1;
601 for (; s->mb_y < s->mb_height; s->mb_y++) {
602 ff_init_block_index(s);
603 for (; s->mb_x < s->mb_width; s->mb_x++) {
604 const int xy = s->mb_x + s->mb_y * s->mb_stride;
609 ff_update_block_index(s);
610 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
611 s->first_slice_line = 0;
613 if (s->pict_type == AV_PICTURE_TYPE_I) {
617 if (show_bits_long(&s->gb, 19) == DC_MARKER)
620 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
622 av_log(s->avctx, AV_LOG_ERROR,
623 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
628 s->cbp_table[xy] = cbpc & 3;
629 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
633 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
635 s->current_picture.qscale_table[xy] = s->qscale;
637 s->mbintra_table[xy] = 1;
638 for (i = 0; i < 6; i++) {
640 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
642 av_log(s->avctx, AV_LOG_ERROR,
643 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
650 s->pred_dir_table[xy] = dir;
651 } else { /* P/S_TYPE */
652 int mx, my, pred_x, pred_y, bits;
653 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
654 const int stride = s->b8_stride * 2;
657 bits = show_bits(&s->gb, 17);
658 if (bits == MOTION_MARKER)
662 if (bits & 0x10000) {
664 if (s->pict_type == AV_PICTURE_TYPE_S &&
665 ctx->vol_sprite_usage == GMC_SPRITE) {
666 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
670 mx = get_amv(ctx, 0);
671 my = get_amv(ctx, 1);
673 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
680 mot_val[0 + stride] =
681 mot_val[2 + stride] = mx;
684 mot_val[1 + stride] =
685 mot_val[3 + stride] = my;
687 if (s->mbintra_table[xy])
688 ff_clean_intra_table_entries(s);
692 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
694 av_log(s->avctx, AV_LOG_ERROR,
695 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
701 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
703 s->mb_intra = ((cbpc & 4) != 0);
706 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
707 s->mbintra_table[xy] = 1;
710 mot_val[0 + stride] =
711 mot_val[2 + stride] = 0;
714 mot_val[1 + stride] =
715 mot_val[3 + stride] = 0;
717 if (s->mbintra_table[xy])
718 ff_clean_intra_table_entries(s);
720 if (s->pict_type == AV_PICTURE_TYPE_S &&
721 ctx->vol_sprite_usage == GMC_SPRITE &&
723 s->mcsel = get_bits1(&s->gb);
727 if ((cbpc & 16) == 0) {
728 /* 16x16 motion prediction */
730 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
732 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
736 my = ff_h263_decode_motion(s, pred_y, s->f_code);
739 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
742 mx = get_amv(ctx, 0);
743 my = get_amv(ctx, 1);
744 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
751 mot_val[0 + stride] =
752 mot_val[2 + stride] = mx;
755 mot_val[1 + stride] =
756 mot_val[3 + stride] = my;
759 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
761 for (i = 0; i < 4; i++) {
762 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
763 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
767 my = ff_h263_decode_motion(s, pred_y, s->f_code);
784 * decode second partition.
785 * @return <0 if an error occurred
787 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
790 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
792 s->mb_x = s->resync_mb_x;
793 s->first_slice_line = 1;
794 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
795 ff_init_block_index(s);
796 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
797 const int xy = s->mb_x + s->mb_y * s->mb_stride;
800 ff_update_block_index(s);
801 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
802 s->first_slice_line = 0;
804 if (s->pict_type == AV_PICTURE_TYPE_I) {
805 int ac_pred = get_bits1(&s->gb);
806 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
808 av_log(s->avctx, AV_LOG_ERROR,
809 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
813 s->cbp_table[xy] |= cbpy << 2;
814 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
815 } else { /* P || S_TYPE */
816 if (IS_INTRA(s->current_picture.mb_type[xy])) {
819 int ac_pred = get_bits1(&s->gb);
820 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
823 av_log(s->avctx, AV_LOG_ERROR,
824 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
828 if (s->cbp_table[xy] & 8)
829 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
830 s->current_picture.qscale_table[xy] = s->qscale;
832 for (i = 0; i < 6; i++) {
834 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
836 av_log(s->avctx, AV_LOG_ERROR,
837 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
844 s->cbp_table[xy] &= 3; // remove dquant
845 s->cbp_table[xy] |= cbpy << 2;
846 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
847 s->pred_dir_table[xy] = dir;
848 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
849 s->current_picture.qscale_table[xy] = s->qscale;
850 s->cbp_table[xy] = 0;
852 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
855 av_log(s->avctx, AV_LOG_ERROR,
856 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
860 if (s->cbp_table[xy] & 8)
861 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
862 s->current_picture.qscale_table[xy] = s->qscale;
864 s->cbp_table[xy] &= 3; // remove dquant
865 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
869 if (mb_num >= mb_count)
877 * Decode the first and second partition.
878 * @return <0 if error (and sets error type in the error_status_table)
880 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
882 MpegEncContext *s = &ctx->m;
884 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
885 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
887 mb_num = mpeg4_decode_partition_a(ctx);
889 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
890 s->mb_x, s->mb_y, part_a_error);
894 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
895 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
896 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
897 s->mb_x, s->mb_y, part_a_error);
901 s->mb_num_left = mb_num;
903 if (s->pict_type == AV_PICTURE_TYPE_I) {
904 while (show_bits(&s->gb, 9) == 1)
905 skip_bits(&s->gb, 9);
906 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
907 av_log(s->avctx, AV_LOG_ERROR,
908 "marker missing after first I partition at %d %d\n",
913 while (show_bits(&s->gb, 10) == 1)
914 skip_bits(&s->gb, 10);
915 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
916 av_log(s->avctx, AV_LOG_ERROR,
917 "marker missing after first P partition at %d %d\n",
922 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
923 s->mb_x - 1, s->mb_y, part_a_end);
925 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
926 if (s->pict_type == AV_PICTURE_TYPE_P)
927 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
928 s->mb_x, s->mb_y, ER_DC_ERROR);
931 if (s->pict_type == AV_PICTURE_TYPE_P)
932 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
933 s->mb_x - 1, s->mb_y, ER_DC_END);
941 * @return <0 if an error occurred
943 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
944 int n, int coded, int intra, int rvlc)
946 MpegEncContext *s = &ctx->m;
947 int level, i, last, run, qmul, qadd;
948 int av_uninit(dc_pred_dir);
951 const uint8_t *scan_table;
953 // Note intra & rvlc should be optimized away if this is inlined
956 if (ctx->use_intra_dc_vlc) {
958 if (s->partitioned_frame) {
959 level = s->dc_val[0][s->block_index[n]];
961 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
963 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
964 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
966 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
974 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
980 rl = &ff_rvlc_rl_intra;
981 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
983 rl = &ff_mpeg4_rl_intra;
984 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
987 if (dc_pred_dir == 0)
988 scan_table = s->intra_v_scantable.permutated; /* left */
990 scan_table = s->intra_h_scantable.permutated; /* top */
992 scan_table = s->intra_scantable.permutated;
999 s->block_last_index[n] = i;
1003 rl = &ff_rvlc_rl_inter;
1005 rl = &ff_h263_rl_inter;
1007 scan_table = s->intra_scantable.permutated;
1009 if (s->mpeg_quant) {
1013 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1015 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1017 qmul = s->qscale << 1;
1018 qadd = (s->qscale - 1) | 1;
1020 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1022 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1026 OPEN_READER(re, &s->gb);
1028 UPDATE_CACHE(re, &s->gb);
1029 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1033 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1034 av_log(s->avctx, AV_LOG_ERROR,
1035 "1. marker bit missing in rvlc esc\n");
1038 SKIP_CACHE(re, &s->gb, 1);
1040 last = SHOW_UBITS(re, &s->gb, 1);
1041 SKIP_CACHE(re, &s->gb, 1);
1042 run = SHOW_UBITS(re, &s->gb, 6);
1043 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1044 UPDATE_CACHE(re, &s->gb);
1046 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1047 av_log(s->avctx, AV_LOG_ERROR,
1048 "2. marker bit missing in rvlc esc\n");
1051 SKIP_CACHE(re, &s->gb, 1);
1053 level = SHOW_UBITS(re, &s->gb, 11);
1054 SKIP_CACHE(re, &s->gb, 11);
1056 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1057 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1060 SKIP_CACHE(re, &s->gb, 5);
1062 level = level * qmul + qadd;
1063 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1064 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1071 cache = GET_CACHE(re, &s->gb);
1074 cache ^= 0xC0000000;
1076 if (cache & 0x80000000) {
1077 if (cache & 0x40000000) {
1079 SKIP_CACHE(re, &s->gb, 2);
1080 last = SHOW_UBITS(re, &s->gb, 1);
1081 SKIP_CACHE(re, &s->gb, 1);
1082 run = SHOW_UBITS(re, &s->gb, 6);
1083 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1084 UPDATE_CACHE(re, &s->gb);
1087 level = SHOW_SBITS(re, &s->gb, 12);
1088 LAST_SKIP_BITS(re, &s->gb, 12);
1090 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1091 av_log(s->avctx, AV_LOG_ERROR,
1092 "1. marker bit missing in 3. esc\n");
1093 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1096 SKIP_CACHE(re, &s->gb, 1);
1098 level = SHOW_SBITS(re, &s->gb, 12);
1099 SKIP_CACHE(re, &s->gb, 12);
1101 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1102 av_log(s->avctx, AV_LOG_ERROR,
1103 "2. marker bit missing in 3. esc\n");
1104 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1108 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1112 if (s->error_recognition >= FF_ER_COMPLIANT) {
1113 const int abs_level= FFABS(level);
1114 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1115 const int run1= run - rl->max_run[last][abs_level] - 1;
1116 if (abs_level <= rl->max_level[last][run]) {
1117 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1120 if (s->error_recognition > FF_ER_COMPLIANT) {
1121 if (abs_level <= rl->max_level[last][run]*2) {
1122 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1125 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1126 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1134 level = level * qmul + qadd;
1136 level = level * qmul - qadd;
1138 if ((unsigned)(level + 2048) > 4095) {
1139 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1140 if (level > 2560 || level < -2560) {
1141 av_log(s->avctx, AV_LOG_ERROR,
1142 "|level| overflow in 3. esc, qp=%d\n",
1147 level = level < 0 ? -2048 : 2047;
1155 SKIP_BITS(re, &s->gb, 2);
1156 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1157 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1158 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1159 LAST_SKIP_BITS(re, &s->gb, 1);
1163 SKIP_BITS(re, &s->gb, 1);
1164 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1166 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1167 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1168 LAST_SKIP_BITS(re, &s->gb, 1);
1173 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1174 LAST_SKIP_BITS(re, &s->gb, 1);
1176 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1180 av_log(s->avctx, AV_LOG_ERROR,
1181 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1185 block[scan_table[i]] = level;
1189 block[scan_table[i]] = level;
1191 CLOSE_READER(re, &s->gb);
1196 if (!ctx->use_intra_dc_vlc) {
1197 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1199 i -= i >> 31; // if (i == -1) i = 0;
1202 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1204 i = 63; // FIXME not optimal
1206 s->block_last_index[n] = i;
1211 * decode partition C of one MB.
1212 * @return <0 if an error occurred
1214 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1216 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1218 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1220 mb_type = s->current_picture.mb_type[xy];
1221 cbp = s->cbp_table[xy];
1223 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1225 if (s->current_picture.qscale_table[xy] != s->qscale)
1226 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1228 if (s->pict_type == AV_PICTURE_TYPE_P ||
1229 s->pict_type == AV_PICTURE_TYPE_S) {
1231 for (i = 0; i < 4; i++) {
1232 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1233 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1235 s->mb_intra = IS_INTRA(mb_type);
1237 if (IS_SKIP(mb_type)) {
1239 for (i = 0; i < 6; i++)
1240 s->block_last_index[i] = -1;
1241 s->mv_dir = MV_DIR_FORWARD;
1242 s->mv_type = MV_TYPE_16X16;
1243 if (s->pict_type == AV_PICTURE_TYPE_S
1244 && ctx->vol_sprite_usage == GMC_SPRITE) {
1251 } else if (s->mb_intra) {
1252 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1253 } else if (!s->mb_intra) {
1254 // s->mcsel = 0; // FIXME do we need to init that?
1256 s->mv_dir = MV_DIR_FORWARD;
1257 if (IS_8X8(mb_type)) {
1258 s->mv_type = MV_TYPE_8X8;
1260 s->mv_type = MV_TYPE_16X16;
1263 } else { /* I-Frame */
1265 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1268 if (!IS_SKIP(mb_type)) {
1270 s->bdsp.clear_blocks(s->block[0]);
1271 /* decode each block */
1272 for (i = 0; i < 6; i++) {
1273 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1274 av_log(s->avctx, AV_LOG_ERROR,
1275 "texture corrupted at %d %d %d\n",
1276 s->mb_x, s->mb_y, s->mb_intra);
1283 /* per-MB end of slice check */
1284 if (--s->mb_num_left <= 0) {
1285 if (mpeg4_is_resync(ctx))
1290 if (mpeg4_is_resync(ctx)) {
1291 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1292 if (s->cbp_table[xy + delta])
1299 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1301 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1302 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1304 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1305 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1307 av_assert2(s->h263_pred);
1309 if (s->pict_type == AV_PICTURE_TYPE_P ||
1310 s->pict_type == AV_PICTURE_TYPE_S) {
1312 if (get_bits1(&s->gb)) {
1315 for (i = 0; i < 6; i++)
1316 s->block_last_index[i] = -1;
1317 s->mv_dir = MV_DIR_FORWARD;
1318 s->mv_type = MV_TYPE_16X16;
1319 if (s->pict_type == AV_PICTURE_TYPE_S &&
1320 ctx->vol_sprite_usage == GMC_SPRITE) {
1321 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1326 s->mv[0][0][0] = get_amv(ctx, 0);
1327 s->mv[0][0][1] = get_amv(ctx, 1);
1330 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1340 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1342 av_log(s->avctx, AV_LOG_ERROR,
1343 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1346 } while (cbpc == 20);
1348 s->bdsp.clear_blocks(s->block[0]);
1350 s->mb_intra = ((cbpc & 4) != 0);
1354 if (s->pict_type == AV_PICTURE_TYPE_S &&
1355 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1356 s->mcsel = get_bits1(&s->gb);
1359 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1361 av_log(s->avctx, AV_LOG_ERROR,
1362 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1363 return AVERROR_INVALIDDATA;
1366 cbp = (cbpc & 3) | (cbpy << 2);
1368 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1369 if ((!s->progressive_sequence) &&
1370 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1371 s->interlaced_dct = get_bits1(&s->gb);
1373 s->mv_dir = MV_DIR_FORWARD;
1374 if ((cbpc & 16) == 0) {
1376 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1379 /* 16x16 global motion prediction */
1380 s->mv_type = MV_TYPE_16X16;
1381 mx = get_amv(ctx, 0);
1382 my = get_amv(ctx, 1);
1383 s->mv[0][0][0] = mx;
1384 s->mv[0][0][1] = my;
1385 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1386 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1389 /* 16x8 field motion prediction */
1390 s->mv_type = MV_TYPE_FIELD;
1392 s->field_select[0][0] = get_bits1(&s->gb);
1393 s->field_select[0][1] = get_bits1(&s->gb);
1395 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1397 for (i = 0; i < 2; i++) {
1398 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1402 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1406 s->mv[0][i][0] = mx;
1407 s->mv[0][i][1] = my;
1410 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1411 /* 16x16 motion prediction */
1412 s->mv_type = MV_TYPE_16X16;
1413 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1414 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1419 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1423 s->mv[0][0][0] = mx;
1424 s->mv[0][0][1] = my;
1427 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1428 s->mv_type = MV_TYPE_8X8;
1429 for (i = 0; i < 4; i++) {
1430 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1431 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1435 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1438 s->mv[0][i][0] = mx;
1439 s->mv[0][i][1] = my;
1444 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1445 int modb1; // first bit of modb
1446 int modb2; // second bit of modb
1449 s->mb_intra = 0; // B-frames never contain intra blocks
1450 s->mcsel = 0; // ... true gmc blocks
1453 for (i = 0; i < 2; i++) {
1454 s->last_mv[i][0][0] =
1455 s->last_mv[i][0][1] =
1456 s->last_mv[i][1][0] =
1457 s->last_mv[i][1][1] = 0;
1460 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1463 /* if we skipped it in the future P-frame than skip it now too */
1464 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1466 if (s->mb_skipped) {
1468 for (i = 0; i < 6; i++)
1469 s->block_last_index[i] = -1;
1471 s->mv_dir = MV_DIR_FORWARD;
1472 s->mv_type = MV_TYPE_16X16;
1477 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1483 modb1 = get_bits1(&s->gb);
1485 // like MB_TYPE_B_DIRECT but no vectors coded
1486 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1489 modb2 = get_bits1(&s->gb);
1490 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1492 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1495 mb_type = mb_type_b_map[mb_type];
1499 s->bdsp.clear_blocks(s->block[0]);
1500 cbp = get_bits(&s->gb, 6);
1503 if ((!IS_DIRECT(mb_type)) && cbp) {
1504 if (get_bits1(&s->gb))
1505 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1508 if (!s->progressive_sequence) {
1510 s->interlaced_dct = get_bits1(&s->gb);
1512 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1513 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1514 mb_type &= ~MB_TYPE_16x16;
1516 if (USES_LIST(mb_type, 0)) {
1517 s->field_select[0][0] = get_bits1(&s->gb);
1518 s->field_select[0][1] = get_bits1(&s->gb);
1520 if (USES_LIST(mb_type, 1)) {
1521 s->field_select[1][0] = get_bits1(&s->gb);
1522 s->field_select[1][1] = get_bits1(&s->gb);
1528 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1529 s->mv_type = MV_TYPE_16X16;
1531 if (USES_LIST(mb_type, 0)) {
1532 s->mv_dir = MV_DIR_FORWARD;
1534 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1535 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1536 s->last_mv[0][1][0] =
1537 s->last_mv[0][0][0] =
1538 s->mv[0][0][0] = mx;
1539 s->last_mv[0][1][1] =
1540 s->last_mv[0][0][1] =
1541 s->mv[0][0][1] = my;
1544 if (USES_LIST(mb_type, 1)) {
1545 s->mv_dir |= MV_DIR_BACKWARD;
1547 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1548 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1549 s->last_mv[1][1][0] =
1550 s->last_mv[1][0][0] =
1551 s->mv[1][0][0] = mx;
1552 s->last_mv[1][1][1] =
1553 s->last_mv[1][0][1] =
1554 s->mv[1][0][1] = my;
1556 } else if (!IS_DIRECT(mb_type)) {
1557 s->mv_type = MV_TYPE_FIELD;
1559 if (USES_LIST(mb_type, 0)) {
1560 s->mv_dir = MV_DIR_FORWARD;
1562 for (i = 0; i < 2; i++) {
1563 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1564 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1565 s->last_mv[0][i][0] =
1566 s->mv[0][i][0] = mx;
1567 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1571 if (USES_LIST(mb_type, 1)) {
1572 s->mv_dir |= MV_DIR_BACKWARD;
1574 for (i = 0; i < 2; i++) {
1575 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1576 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1577 s->last_mv[1][i][0] =
1578 s->mv[1][i][0] = mx;
1579 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1585 if (IS_DIRECT(mb_type)) {
1586 if (IS_SKIP(mb_type)) {
1590 mx = ff_h263_decode_motion(s, 0, 1);
1591 my = ff_h263_decode_motion(s, 0, 1);
1594 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1595 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1597 s->current_picture.mb_type[xy] = mb_type;
1598 } else { /* I-Frame */
1600 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1602 av_log(s->avctx, AV_LOG_ERROR,
1603 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1606 } while (cbpc == 8);
1612 s->ac_pred = get_bits1(&s->gb);
1614 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1616 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1618 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1620 av_log(s->avctx, AV_LOG_ERROR,
1621 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1624 cbp = (cbpc & 3) | (cbpy << 2);
1626 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1629 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1631 if (!s->progressive_sequence)
1632 s->interlaced_dct = get_bits1(&s->gb);
1634 s->bdsp.clear_blocks(s->block[0]);
1635 /* decode each block */
1636 for (i = 0; i < 6; i++) {
1637 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1644 /* decode each block */
1645 for (i = 0; i < 6; i++) {
1646 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1652 /* per-MB end of slice check */
1653 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1654 int next = mpeg4_is_resync(ctx);
1656 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1658 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1661 if (s->pict_type == AV_PICTURE_TYPE_B) {
1662 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1663 ff_thread_await_progress(&s->next_picture_ptr->tf,
1664 (s->mb_x + delta >= s->mb_width)
1665 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1667 if (s->next_picture.mbskip_table[xy + delta])
1678 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1680 int hours, minutes, seconds;
1682 if (!show_bits(gb, 23)) {
1683 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1687 hours = get_bits(gb, 5);
1688 minutes = get_bits(gb, 6);
1689 check_marker(s->avctx, gb, "in gop_header");
1690 seconds = get_bits(gb, 6);
1692 s->time_base = seconds + 60*(minutes + 60*hours);
1700 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1703 s->avctx->profile = get_bits(gb, 4);
1704 s->avctx->level = get_bits(gb, 4);
1706 // for Simple profile, level 0
1707 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1708 s->avctx->level = 0;
1714 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1716 MpegEncContext *s = &ctx->m;
1717 int width, height, vo_ver_id;
1720 skip_bits(gb, 1); /* random access */
1721 s->vo_type = get_bits(gb, 8);
1722 if (get_bits1(gb) != 0) { /* is_ol_id */
1723 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1724 skip_bits(gb, 3); /* vo_priority */
1728 s->aspect_ratio_info = get_bits(gb, 4);
1729 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1730 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1731 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1733 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1736 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1737 int chroma_format = get_bits(gb, 2);
1738 if (chroma_format != CHROMA_420)
1739 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1741 s->low_delay = get_bits1(gb);
1742 if (get_bits1(gb)) { /* vbv parameters */
1743 get_bits(gb, 15); /* first_half_bitrate */
1744 check_marker(s->avctx, gb, "after first_half_bitrate");
1745 get_bits(gb, 15); /* latter_half_bitrate */
1746 check_marker(s->avctx, gb, "after latter_half_bitrate");
1747 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1748 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1749 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1750 get_bits(gb, 11); /* first_half_vbv_occupancy */
1751 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1752 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1753 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1756 /* is setting low delay flag only once the smartest thing to do?
1757 * low delay detection will not be overridden. */
1758 if (s->picture_number == 0) {
1759 switch(s->vo_type) {
1760 case SIMPLE_VO_TYPE:
1761 case ADV_SIMPLE_VO_TYPE:
1770 ctx->shape = get_bits(gb, 2); /* vol shape */
1771 if (ctx->shape != RECT_SHAPE)
1772 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1773 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1774 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1775 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1778 check_marker(s->avctx, gb, "before time_increment_resolution");
1780 s->avctx->framerate.num = get_bits(gb, 16);
1781 if (!s->avctx->framerate.num) {
1782 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1783 return AVERROR_INVALIDDATA;
1786 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1787 if (ctx->time_increment_bits < 1)
1788 ctx->time_increment_bits = 1;
1790 check_marker(s->avctx, gb, "before fixed_vop_rate");
1792 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1793 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1795 s->avctx->framerate.den = 1;
1797 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1801 if (ctx->shape != BIN_ONLY_SHAPE) {
1802 if (ctx->shape == RECT_SHAPE) {
1803 check_marker(s->avctx, gb, "before width");
1804 width = get_bits(gb, 13);
1805 check_marker(s->avctx, gb, "before height");
1806 height = get_bits(gb, 13);
1807 check_marker(s->avctx, gb, "after height");
1808 if (width && height && /* they should be non zero but who knows */
1809 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1810 if (s->width && s->height &&
1811 (s->width != width || s->height != height))
1812 s->context_reinit = 1;
1818 s->progressive_sequence =
1819 s->progressive_frame = get_bits1(gb) ^ 1;
1820 s->interlaced_dct = 0;
1821 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1822 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1823 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1825 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1827 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1829 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1830 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1831 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1832 ctx->vol_sprite_usage == GMC_SPRITE) {
1833 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1834 skip_bits(gb, 13); // sprite_width
1835 check_marker(s->avctx, gb, "after sprite_width");
1836 skip_bits(gb, 13); // sprite_height
1837 check_marker(s->avctx, gb, "after sprite_height");
1838 skip_bits(gb, 13); // sprite_left
1839 check_marker(s->avctx, gb, "after sprite_left");
1840 skip_bits(gb, 13); // sprite_top
1841 check_marker(s->avctx, gb, "after sprite_top");
1843 ctx->num_sprite_warping_points = get_bits(gb, 6);
1844 if (ctx->num_sprite_warping_points > 3) {
1845 av_log(s->avctx, AV_LOG_ERROR,
1846 "%d sprite_warping_points\n",
1847 ctx->num_sprite_warping_points);
1848 ctx->num_sprite_warping_points = 0;
1849 return AVERROR_INVALIDDATA;
1851 s->sprite_warping_accuracy = get_bits(gb, 2);
1852 ctx->sprite_brightness_change = get_bits1(gb);
1853 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1854 skip_bits1(gb); // low_latency_sprite
1856 // FIXME sadct disable bit if verid!=1 && shape not rect
1858 if (get_bits1(gb) == 1) { /* not_8_bit */
1859 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1860 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1861 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1862 if (s->quant_precision != 5)
1863 av_log(s->avctx, AV_LOG_ERROR,
1864 "quant precision %d\n", s->quant_precision);
1865 if (s->quant_precision<3 || s->quant_precision>9) {
1866 s->quant_precision = 5;
1869 s->quant_precision = 5;
1872 // FIXME a bunch of grayscale shape things
1874 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1877 /* load default matrixes */
1878 for (i = 0; i < 64; i++) {
1879 int j = s->idsp.idct_permutation[i];
1880 v = ff_mpeg4_default_intra_matrix[i];
1881 s->intra_matrix[j] = v;
1882 s->chroma_intra_matrix[j] = v;
1884 v = ff_mpeg4_default_non_intra_matrix[i];
1885 s->inter_matrix[j] = v;
1886 s->chroma_inter_matrix[j] = v;
1889 /* load custom intra matrix */
1890 if (get_bits1(gb)) {
1892 for (i = 0; i < 64; i++) {
1894 if (get_bits_left(gb) < 8) {
1895 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1896 return AVERROR_INVALIDDATA;
1898 v = get_bits(gb, 8);
1903 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1904 s->intra_matrix[j] = last;
1905 s->chroma_intra_matrix[j] = last;
1908 /* replicate last value */
1909 for (; i < 64; i++) {
1910 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1911 s->intra_matrix[j] = last;
1912 s->chroma_intra_matrix[j] = last;
1916 /* load custom non intra matrix */
1917 if (get_bits1(gb)) {
1919 for (i = 0; i < 64; i++) {
1921 if (get_bits_left(gb) < 8) {
1922 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1923 return AVERROR_INVALIDDATA;
1925 v = get_bits(gb, 8);
1930 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1931 s->inter_matrix[j] = v;
1932 s->chroma_inter_matrix[j] = v;
1935 /* replicate last value */
1936 for (; i < 64; i++) {
1937 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1938 s->inter_matrix[j] = last;
1939 s->chroma_inter_matrix[j] = last;
1943 // FIXME a bunch of grayscale shape things
1947 s->quarter_sample = get_bits1(gb);
1949 s->quarter_sample = 0;
1951 if (get_bits_left(gb) < 4) {
1952 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1953 return AVERROR_INVALIDDATA;
1956 if (!get_bits1(gb)) {
1957 int pos = get_bits_count(gb);
1958 int estimation_method = get_bits(gb, 2);
1959 if (estimation_method < 2) {
1960 if (!get_bits1(gb)) {
1961 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1962 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1963 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1964 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1965 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1966 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
1968 if (!get_bits1(gb)) {
1969 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1970 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1971 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1972 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1974 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
1975 skip_bits_long(gb, pos - get_bits_count(gb));
1978 if (!get_bits1(gb)) {
1979 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1980 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1981 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1982 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1984 if (!get_bits1(gb)) {
1985 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1986 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1987 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1988 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1989 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1990 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1992 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
1993 skip_bits_long(gb, pos - get_bits_count(gb));
1996 if (estimation_method == 1) {
1997 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1998 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2001 av_log(s->avctx, AV_LOG_ERROR,
2002 "Invalid Complexity estimation method %d\n",
2007 ctx->cplx_estimation_trash_i =
2008 ctx->cplx_estimation_trash_p =
2009 ctx->cplx_estimation_trash_b = 0;
2012 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2014 s->data_partitioning = get_bits1(gb);
2015 if (s->data_partitioning)
2016 ctx->rvlc = get_bits1(gb);
2018 if (vo_ver_id != 1) {
2019 ctx->new_pred = get_bits1(gb);
2020 if (ctx->new_pred) {
2021 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2022 skip_bits(gb, 2); /* requested upstream message type */
2023 skip_bits1(gb); /* newpred segment type */
2025 if (get_bits1(gb)) // reduced_res_vop
2026 av_log(s->avctx, AV_LOG_ERROR,
2027 "reduced resolution VOP not supported\n");
2032 ctx->scalability = get_bits1(gb);
2034 if (ctx->scalability) {
2035 GetBitContext bak = *gb;
2036 int h_sampling_factor_n;
2037 int h_sampling_factor_m;
2038 int v_sampling_factor_n;
2039 int v_sampling_factor_m;
2041 skip_bits1(gb); // hierarchy_type
2042 skip_bits(gb, 4); /* ref_layer_id */
2043 skip_bits1(gb); /* ref_layer_sampling_dir */
2044 h_sampling_factor_n = get_bits(gb, 5);
2045 h_sampling_factor_m = get_bits(gb, 5);
2046 v_sampling_factor_n = get_bits(gb, 5);
2047 v_sampling_factor_m = get_bits(gb, 5);
2048 ctx->enhancement_type = get_bits1(gb);
2050 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2051 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2052 /* illegal scalability header (VERY broken encoder),
2053 * trying to workaround */
2054 ctx->scalability = 0;
2057 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2059 // bin shape stuff FIXME
2063 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2064 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
2065 s->avctx->framerate.den, s->avctx->framerate.num,
2066 ctx->time_increment_bits,
2068 s->progressive_sequence,
2070 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2071 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2079 * Decode the user data stuff in the header.
2080 * Also initializes divx/xvid/lavc_version/build.
2082 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2084 MpegEncContext *s = &ctx->m;
2088 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2091 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2092 if (show_bits(gb, 23) == 0)
2094 buf[i] = get_bits(gb, 8);
2098 /* divx detection */
2099 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2101 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2103 ctx->divx_version = ver;
2104 ctx->divx_build = build;
2105 s->divx_packed = e == 3 && last == 'p';
2108 /* libavcodec detection */
2109 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2111 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2113 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2115 build = (ver << 16) + (ver2 << 8) + ver3;
2118 if (strcmp(buf, "ffmpeg") == 0)
2119 ctx->lavc_build = 4600;
2122 ctx->lavc_build = build;
2124 /* Xvid detection */
2125 e = sscanf(buf, "XviD%d", &build);
2127 ctx->xvid_build = build;
2132 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2134 Mpeg4DecContext *ctx = avctx->priv_data;
2135 MpegEncContext *s = &ctx->m;
2137 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2138 if (s->codec_tag == AV_RL32("XVID") ||
2139 s->codec_tag == AV_RL32("XVIX") ||
2140 s->codec_tag == AV_RL32("RMP4") ||
2141 s->codec_tag == AV_RL32("ZMP4") ||
2142 s->codec_tag == AV_RL32("SIPP"))
2143 ctx->xvid_build = 0;
2146 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2147 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2148 ctx->vol_control_parameters == 0)
2149 ctx->divx_version = 400; // divx 4
2151 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2153 ctx->divx_build = -1;
2156 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2157 if (s->codec_tag == AV_RL32("XVIX"))
2158 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2160 if (s->codec_tag == AV_RL32("UMP4"))
2161 s->workaround_bugs |= FF_BUG_UMP4;
2163 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2164 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2166 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2167 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2169 if (ctx->xvid_build <= 3U)
2170 s->padding_bug_score = 256 * 256 * 256 * 64;
2172 if (ctx->xvid_build <= 1U)
2173 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2175 if (ctx->xvid_build <= 12U)
2176 s->workaround_bugs |= FF_BUG_EDGE;
2178 if (ctx->xvid_build <= 32U)
2179 s->workaround_bugs |= FF_BUG_DC_CLIP;
2181 #define SET_QPEL_FUNC(postfix1, postfix2) \
2182 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2183 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2184 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2186 if (ctx->lavc_build < 4653U)
2187 s->workaround_bugs |= FF_BUG_STD_QPEL;
2189 if (ctx->lavc_build < 4655U)
2190 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2192 if (ctx->lavc_build < 4670U)
2193 s->workaround_bugs |= FF_BUG_EDGE;
2195 if (ctx->lavc_build <= 4712U)
2196 s->workaround_bugs |= FF_BUG_DC_CLIP;
2198 if (ctx->divx_version >= 0)
2199 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2200 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2201 s->padding_bug_score = 256 * 256 * 256 * 64;
2203 if (ctx->divx_version < 500U)
2204 s->workaround_bugs |= FF_BUG_EDGE;
2206 if (ctx->divx_version >= 0)
2207 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2210 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2211 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2212 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2213 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2214 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2215 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2216 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2218 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2219 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2220 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2221 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2222 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2223 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2226 if (avctx->debug & FF_DEBUG_BUGS)
2227 av_log(s->avctx, AV_LOG_DEBUG,
2228 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2229 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2230 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2232 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2233 s->codec_id == AV_CODEC_ID_MPEG4 &&
2234 avctx->idct_algo == FF_IDCT_AUTO) {
2235 avctx->idct_algo = FF_IDCT_XVID;
2236 ff_mpv_idct_init(s);
2243 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2245 MpegEncContext *s = &ctx->m;
2246 int time_incr, time_increment;
2249 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2250 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2251 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2252 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2256 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2257 if (s->partitioned_frame)
2258 s->decode_mb = mpeg4_decode_partitioned_mb;
2260 s->decode_mb = mpeg4_decode_mb;
2263 while (get_bits1(gb) != 0)
2266 check_marker(s->avctx, gb, "before time_increment");
2268 if (ctx->time_increment_bits == 0 ||
2269 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2270 av_log(s->avctx, AV_LOG_WARNING,
2271 "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);
2273 for (ctx->time_increment_bits = 1;
2274 ctx->time_increment_bits < 16;
2275 ctx->time_increment_bits++) {
2276 if (s->pict_type == AV_PICTURE_TYPE_P ||
2277 (s->pict_type == AV_PICTURE_TYPE_S &&
2278 ctx->vol_sprite_usage == GMC_SPRITE)) {
2279 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2281 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2285 av_log(s->avctx, AV_LOG_WARNING,
2286 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2287 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2288 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2289 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2294 time_increment = get_bits1(gb); // FIXME investigate further
2296 time_increment = get_bits(gb, ctx->time_increment_bits);
2298 if (s->pict_type != AV_PICTURE_TYPE_B) {
2299 s->last_time_base = s->time_base;
2300 s->time_base += time_incr;
2301 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2302 if (s->workaround_bugs & FF_BUG_UMP4) {
2303 if (s->time < s->last_non_b_time) {
2304 /* header is not mpeg-4-compatible, broken encoder,
2305 * trying to workaround */
2307 s->time += s->avctx->framerate.num;
2310 s->pp_time = s->time - s->last_non_b_time;
2311 s->last_non_b_time = s->time;
2313 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2314 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2315 if (s->pp_time <= s->pb_time ||
2316 s->pp_time <= s->pp_time - s->pb_time ||
2318 /* messed up order, maybe after seeking? skipping current B-frame */
2319 return FRAME_SKIPPED;
2321 ff_mpeg4_init_direct_mv(s);
2323 if (ctx->t_frame == 0)
2324 ctx->t_frame = s->pb_time;
2325 if (ctx->t_frame == 0)
2326 ctx->t_frame = 1; // 1/0 protection
2327 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2328 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2329 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2330 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2331 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2332 s->pb_field_time = 2;
2333 s->pp_field_time = 4;
2334 if (!s->progressive_sequence)
2335 return FRAME_SKIPPED;
2339 if (s->avctx->framerate.den)
2340 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2342 pts = AV_NOPTS_VALUE;
2343 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2345 check_marker(s->avctx, gb, "before vop_coded");
2348 if (get_bits1(gb) != 1) {
2349 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2350 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2351 return FRAME_SKIPPED;
2354 decode_new_pred(ctx, gb);
2356 if (ctx->shape != BIN_ONLY_SHAPE &&
2357 (s->pict_type == AV_PICTURE_TYPE_P ||
2358 (s->pict_type == AV_PICTURE_TYPE_S &&
2359 ctx->vol_sprite_usage == GMC_SPRITE))) {
2360 /* rounding type for motion estimation */
2361 s->no_rounding = get_bits1(gb);
2365 // FIXME reduced res stuff
2367 if (ctx->shape != RECT_SHAPE) {
2368 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2369 skip_bits(gb, 13); /* width */
2370 check_marker(s->avctx, gb, "after width");
2371 skip_bits(gb, 13); /* height */
2372 check_marker(s->avctx, gb, "after height");
2373 skip_bits(gb, 13); /* hor_spat_ref */
2374 check_marker(s->avctx, gb, "after hor_spat_ref");
2375 skip_bits(gb, 13); /* ver_spat_ref */
2377 skip_bits1(gb); /* change_CR_disable */
2379 if (get_bits1(gb) != 0)
2380 skip_bits(gb, 8); /* constant_alpha_value */
2383 // FIXME complexity estimation stuff
2385 if (ctx->shape != BIN_ONLY_SHAPE) {
2386 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2387 if (s->pict_type != AV_PICTURE_TYPE_I)
2388 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2389 if (s->pict_type == AV_PICTURE_TYPE_B)
2390 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2392 if (get_bits_left(gb) < 3) {
2393 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2394 return AVERROR_INVALIDDATA;
2396 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2397 if (!s->progressive_sequence) {
2398 s->top_field_first = get_bits1(gb);
2399 s->alternate_scan = get_bits1(gb);
2401 s->alternate_scan = 0;
2404 if (s->alternate_scan) {
2405 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2406 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2407 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2408 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2410 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2411 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2412 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2413 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2416 if (s->pict_type == AV_PICTURE_TYPE_S &&
2417 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2418 ctx->vol_sprite_usage == GMC_SPRITE)) {
2419 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2420 return AVERROR_INVALIDDATA;
2421 if (ctx->sprite_brightness_change)
2422 av_log(s->avctx, AV_LOG_ERROR,
2423 "sprite_brightness_change not supported\n");
2424 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2425 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2428 if (ctx->shape != BIN_ONLY_SHAPE) {
2429 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2430 if (s->qscale == 0) {
2431 av_log(s->avctx, AV_LOG_ERROR,
2432 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2433 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2436 if (s->pict_type != AV_PICTURE_TYPE_I) {
2437 s->f_code = get_bits(gb, 3); /* fcode_for */
2438 if (s->f_code == 0) {
2439 av_log(s->avctx, AV_LOG_ERROR,
2440 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2442 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2447 if (s->pict_type == AV_PICTURE_TYPE_B) {
2448 s->b_code = get_bits(gb, 3);
2449 if (s->b_code == 0) {
2450 av_log(s->avctx, AV_LOG_ERROR,
2451 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2453 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2458 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2459 av_log(s->avctx, AV_LOG_DEBUG,
2460 "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",
2461 s->qscale, s->f_code, s->b_code,
2462 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")),
2463 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2464 s->top_field_first, s->quarter_sample ? "q" : "h",
2465 s->data_partitioning, ctx->resync_marker,
2466 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2467 1 - s->no_rounding, s->vo_type,
2468 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2469 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2470 ctx->cplx_estimation_trash_b,
2476 if (!ctx->scalability) {
2477 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2478 skip_bits1(gb); // vop shape coding type
2480 if (ctx->enhancement_type) {
2481 int load_backward_shape = get_bits1(gb);
2482 if (load_backward_shape)
2483 av_log(s->avctx, AV_LOG_ERROR,
2484 "load backward shape isn't supported\n");
2486 skip_bits(gb, 2); // ref_select_code
2489 /* detect buggy encoders which don't set the low_delay flag
2490 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2491 * easily (although it's buggy too) */
2492 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2493 ctx->divx_version == -1 && s->picture_number == 0) {
2494 av_log(s->avctx, AV_LOG_WARNING,
2495 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2499 s->picture_number++; // better than pic number==0 always ;)
2501 // FIXME add short header support
2502 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2503 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2505 if (s->workaround_bugs & FF_BUG_EDGE) {
2506 s->h_edge_pos = s->width;
2507 s->v_edge_pos = s->height;
2513 * Decode MPEG-4 headers.
2514 * @return <0 if no VOP found (or a damaged one)
2515 * FRAME_SKIPPED if a not coded VOP is found
2516 * 0 if a VOP is found
2518 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2520 MpegEncContext *s = &ctx->m;
2521 unsigned startcode, v;
2524 /* search next start code */
2527 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2529 if (get_bits(gb, 8) == 0xF0)
2535 if (get_bits_count(gb) >= gb->size_in_bits) {
2536 if (gb->size_in_bits == 8 &&
2537 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2538 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2539 return FRAME_SKIPPED; // divx bug
2541 return -1; // end of stream
2544 /* use the bits after the test */
2545 v = get_bits(gb, 8);
2546 startcode = ((startcode << 8) | v) & 0xffffffff;
2548 if ((startcode & 0xFFFFFF00) != 0x100)
2549 continue; // no startcode
2551 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2552 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2553 if (startcode <= 0x11F)
2554 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2555 else if (startcode <= 0x12F)
2556 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2557 else if (startcode <= 0x13F)
2558 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2559 else if (startcode <= 0x15F)
2560 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2561 else if (startcode <= 0x1AF)
2562 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2563 else if (startcode == 0x1B0)
2564 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2565 else if (startcode == 0x1B1)
2566 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2567 else if (startcode == 0x1B2)
2568 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2569 else if (startcode == 0x1B3)
2570 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2571 else if (startcode == 0x1B4)
2572 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2573 else if (startcode == 0x1B5)
2574 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2575 else if (startcode == 0x1B6)
2576 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2577 else if (startcode == 0x1B7)
2578 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2579 else if (startcode == 0x1B8)
2580 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2581 else if (startcode == 0x1B9)
2582 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2583 else if (startcode == 0x1BA)
2584 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2585 else if (startcode == 0x1BB)
2586 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2587 else if (startcode == 0x1BC)
2588 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2589 else if (startcode == 0x1BD)
2590 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2591 else if (startcode == 0x1BE)
2592 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2593 else if (startcode == 0x1BF)
2594 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2595 else if (startcode == 0x1C0)
2596 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2597 else if (startcode == 0x1C1)
2598 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2599 else if (startcode == 0x1C2)
2600 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2601 else if (startcode == 0x1C3)
2602 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2603 else if (startcode <= 0x1C5)
2604 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2605 else if (startcode <= 0x1FF)
2606 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2607 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2610 if (startcode >= 0x120 && startcode <= 0x12F) {
2611 if ((ret = decode_vol_header(ctx, gb)) < 0)
2613 } else if (startcode == USER_DATA_STARTCODE) {
2614 decode_user_data(ctx, gb);
2615 } else if (startcode == GOP_STARTCODE) {
2616 mpeg4_decode_gop_header(s, gb);
2617 } else if (startcode == VOS_STARTCODE) {
2618 mpeg4_decode_profile_level(s, gb);
2619 } else if (startcode == VOP_STARTCODE) {
2628 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2630 s->avctx->has_b_frames = !s->low_delay;
2632 return decode_vop_header(ctx, gb);
2635 av_cold void ff_mpeg4videodec_static_init(void) {
2636 static int done = 0;
2639 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2640 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2641 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2642 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2643 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2644 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2645 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2646 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2647 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2648 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2649 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2650 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2651 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2652 &ff_sprite_trajectory_tab[0][1], 4, 2,
2653 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2654 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2655 &ff_mb_type_b_tab[0][1], 2, 1,
2656 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2661 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2663 Mpeg4DecContext *ctx = avctx->priv_data;
2664 MpegEncContext *s = &ctx->m;
2666 /* divx 5.01+ bitstream reorder stuff */
2667 /* Since this clobbers the input buffer and hwaccel codecs still need the
2668 * data during hwaccel->end_frame we should not do this any earlier */
2669 if (s->divx_packed) {
2670 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2671 int startcode_found = 0;
2673 if (buf_size - current_pos > 7) {
2676 for (i = current_pos; i < buf_size - 4; i++)
2681 buf[i + 3] == 0xB6) {
2682 startcode_found = !(buf[i + 4] & 0x40);
2687 if (startcode_found) {
2688 if (!ctx->showed_packed_warning) {
2689 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2690 "wasteful way to store B-frames ('packed B-frames'). "
2691 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2692 ctx->showed_packed_warning = 1;
2694 av_fast_padded_malloc(&s->bitstream_buffer,
2695 &s->allocated_bitstream_buffer_size,
2696 buf_size - current_pos);
2697 if (!s->bitstream_buffer) {
2698 s->bitstream_buffer_size = 0;
2699 return AVERROR(ENOMEM);
2701 memcpy(s->bitstream_buffer, buf + current_pos,
2702 buf_size - current_pos);
2703 s->bitstream_buffer_size = buf_size - current_pos;
2711 static int mpeg4_update_thread_context(AVCodecContext *dst,
2712 const AVCodecContext *src)
2714 Mpeg4DecContext *s = dst->priv_data;
2715 const Mpeg4DecContext *s1 = src->priv_data;
2716 int init = s->m.context_initialized;
2718 int ret = ff_mpeg_update_thread_context(dst, src);
2723 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2725 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2726 ff_xvid_idct_init(&s->m.idsp, dst);
2732 static av_cold int decode_init(AVCodecContext *avctx)
2734 Mpeg4DecContext *ctx = avctx->priv_data;
2735 MpegEncContext *s = &ctx->m;
2741 ctx->lavc_build = -1;
2743 if ((ret = ff_h263_decode_init(avctx)) < 0)
2746 ff_mpeg4videodec_static_init();
2749 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2750 s->decode_mb = mpeg4_decode_mb;
2751 ctx->time_increment_bits = 4; /* default value for broken headers */
2753 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2754 avctx->internal->allocate_progress = 1;
2759 static const AVOption mpeg4_options[] = {
2760 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2761 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2765 static const AVClass mpeg4_class = {
2766 "MPEG4 Video Decoder",
2767 av_default_item_name,
2769 LIBAVUTIL_VERSION_INT,
2772 AVCodec ff_mpeg4_decoder = {
2774 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2775 .type = AVMEDIA_TYPE_VIDEO,
2776 .id = AV_CODEC_ID_MPEG4,
2777 .priv_data_size = sizeof(Mpeg4DecContext),
2778 .init = decode_init,
2779 .close = ff_h263_decode_end,
2780 .decode = ff_h263_decode_frame,
2781 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2782 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2783 AV_CODEC_CAP_FRAME_THREADS,
2784 .flush = ff_mpeg_flush,
2786 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2787 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2788 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2789 .priv_class = &mpeg4_class,
2793 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2794 static const AVClass mpeg4_vdpau_class = {
2795 "MPEG4 Video VDPAU Decoder",
2796 av_default_item_name,
2798 LIBAVUTIL_VERSION_INT,
2801 AVCodec ff_mpeg4_vdpau_decoder = {
2802 .name = "mpeg4_vdpau",
2803 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2804 .type = AVMEDIA_TYPE_VIDEO,
2805 .id = AV_CODEC_ID_MPEG4,
2806 .priv_data_size = sizeof(Mpeg4DecContext),
2807 .init = decode_init,
2808 .close = ff_h263_decode_end,
2809 .decode = ff_h263_decode_frame,
2810 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2811 AV_CODEC_CAP_HWACCEL_VDPAU,
2812 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2814 .priv_class = &mpeg4_vdpau_class,