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"
28 #include "mpegutils.h"
29 #include "mpegvideo.h"
30 #include "mpeg4video.h"
34 /* The defines below define the number of bits that are read at once for
35 * reading vlc values. Changing these may improve speed and data cache needs
36 * be aware though that decreasing them may need the number of stages that is
37 * passed to get_vlc* to be increased. */
38 #define SPRITE_TRAJ_VLC_BITS 6
40 #define MB_TYPE_B_VLC_BITS 4
42 static VLC dc_lum, dc_chrom;
43 static VLC sprite_trajectory;
44 static VLC mb_type_b_vlc;
46 static const int mb_type_b_map[4] = {
47 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
48 MB_TYPE_L0L1 | MB_TYPE_16x16,
49 MB_TYPE_L1 | MB_TYPE_16x16,
50 MB_TYPE_L0 | MB_TYPE_16x16,
55 * @param n block index (0-3 are luma, 4-5 are chroma)
56 * @param dir the ac prediction direction
58 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
61 int16_t *ac_val, *ac_val1;
62 int8_t *const qscale_table = s->current_picture.qscale_table;
65 ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
69 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
73 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
76 for (i = 1; i < 8; i++)
77 block[s->dsp.idct_permutation[i << 3]] += ac_val[i];
79 /* different qscale, we must rescale */
80 for (i = 1; i < 8; i++)
81 block[s->dsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
84 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
86 ac_val -= 16 * s->block_wrap[n];
88 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
91 for (i = 1; i < 8; i++)
92 block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
94 /* different qscale, we must rescale */
95 for (i = 1; i < 8; i++)
96 block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
101 for (i = 1; i < 8; i++)
102 ac_val1[i] = block[s->dsp.idct_permutation[i << 3]];
105 for (i = 1; i < 8; i++)
106 ac_val1[8 + i] = block[s->dsp.idct_permutation[i]];
110 * check if the next stuff is a resync marker or the end.
113 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
115 MpegEncContext *s = &ctx->m;
116 int bits_count = get_bits_count(&s->gb);
117 int v = show_bits(&s->gb, 16);
119 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
123 if (s->pict_type == AV_PICTURE_TYPE_B ||
124 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
126 skip_bits(&s->gb, 8 + s->pict_type);
127 bits_count += 8 + s->pict_type;
128 v = show_bits(&s->gb, 16);
131 if (bits_count + 8 >= s->gb.size_in_bits) {
133 v |= 0x7F >> (7 - (bits_count & 7));
138 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
140 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
141 GetBitContext gb = s->gb;
143 skip_bits(&s->gb, 1);
144 align_get_bits(&s->gb);
146 for (len = 0; len < 32; len++)
147 if (get_bits1(&s->gb))
150 mb_num = get_bits(&s->gb, mb_num_bits);
151 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
156 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
163 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
165 MpegEncContext *s = &ctx->m;
166 int a = 2 << s->sprite_warping_accuracy;
167 int rho = 3 - s->sprite_warping_accuracy;
173 int min_ab, i, w2, h2, w3, h3;
174 int sprite_ref[4][2];
175 int virtual_ref[2][2];
177 // only true for rectangle shapes
178 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
179 { 0, s->height }, { s->width, s->height } };
180 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
182 if (w <= 0 || h <= 0)
183 return AVERROR_INVALIDDATA;
185 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
189 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
191 x = get_xbits(gb, length);
193 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
194 skip_bits1(gb); /* marker bit */
196 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
198 y = get_xbits(gb, length);
200 skip_bits1(gb); /* marker bit */
201 ctx->sprite_traj[i][0] = d[i][0] = x;
202 ctx->sprite_traj[i][1] = d[i][1] = y;
205 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
207 while ((1 << alpha) < w)
209 while ((1 << beta) < h)
210 beta++; /* typo in the mpeg4 std for the definition of w' and h' */
214 // Note, the 4th point isn't used for GMC
215 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
216 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
217 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
218 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
219 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
220 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
221 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
223 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
224 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
225 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
226 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
227 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
228 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
230 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
231 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
233 /* this is mostly identical to the mpeg4 std (and is totally unreadable
234 * because of that...). Perhaps it should be reordered to be more readable.
235 * The idea behind this virtual_ref mess is to be able to use shifts later
236 * per pixel instead of divides so the distance between points is converted
237 * from w&h based to w2&h2 based which are of the 2^x form. */
238 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
239 ROUNDED_DIV(((w - w2) *
240 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
241 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
242 virtual_ref[0][1] = 16 * vop_ref[0][1] +
243 ROUNDED_DIV(((w - w2) *
244 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
245 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
246 virtual_ref[1][0] = 16 * vop_ref[0][0] +
247 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
248 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
249 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
250 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
251 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
253 switch (ctx->num_sprite_warping_points) {
255 s->sprite_offset[0][0] =
256 s->sprite_offset[0][1] =
257 s->sprite_offset[1][0] =
258 s->sprite_offset[1][1] = 0;
259 s->sprite_delta[0][0] = a;
260 s->sprite_delta[0][1] =
261 s->sprite_delta[1][0] = 0;
262 s->sprite_delta[1][1] = a;
263 ctx->sprite_shift[0] =
264 ctx->sprite_shift[1] = 0;
267 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
268 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
269 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
270 a * (vop_ref[0][0] / 2);
271 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
272 a * (vop_ref[0][1] / 2);
273 s->sprite_delta[0][0] = a;
274 s->sprite_delta[0][1] =
275 s->sprite_delta[1][0] = 0;
276 s->sprite_delta[1][1] = a;
277 ctx->sprite_shift[0] =
278 ctx->sprite_shift[1] = 0;
281 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
282 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
284 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
285 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
286 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
287 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
289 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
290 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
292 (-2 * vop_ref[0][0] + 1) +
293 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
294 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
295 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
296 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
297 (-2 * vop_ref[0][0] + 1) +
298 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
299 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
301 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
302 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
303 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
304 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
306 ctx->sprite_shift[0] = alpha + rho;
307 ctx->sprite_shift[1] = alpha + rho + 2;
310 min_ab = FFMIN(alpha, beta);
313 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
314 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
315 h3 * (-vop_ref[0][0]) +
316 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
317 w3 * (-vop_ref[0][1]) +
318 (1 << (alpha + beta + rho - min_ab - 1));
319 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
320 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
321 h3 * (-vop_ref[0][0]) +
322 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
323 w3 * (-vop_ref[0][1]) +
324 (1 << (alpha + beta + rho - min_ab - 1));
325 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
326 h3 * (-2 * vop_ref[0][0] + 1) +
327 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
328 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
329 r * sprite_ref[0][0] - 16 * w2 * h3 +
330 (1 << (alpha + beta + rho - min_ab + 1));
331 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
332 h3 * (-2 * vop_ref[0][0] + 1) +
333 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
334 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
335 r * sprite_ref[0][1] - 16 * w2 * h3 +
336 (1 << (alpha + beta + rho - min_ab + 1));
337 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
338 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
339 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
340 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
342 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
343 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
346 /* try to simplify the situation */
347 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
348 s->sprite_delta[0][1] == 0 &&
349 s->sprite_delta[1][0] == 0 &&
350 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
351 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
352 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
353 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
354 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
355 s->sprite_delta[0][0] = a;
356 s->sprite_delta[0][1] = 0;
357 s->sprite_delta[1][0] = 0;
358 s->sprite_delta[1][1] = a;
359 ctx->sprite_shift[0] = 0;
360 ctx->sprite_shift[1] = 0;
361 s->real_sprite_warping_points = 1;
363 int shift_y = 16 - ctx->sprite_shift[0];
364 int shift_c = 16 - ctx->sprite_shift[1];
365 for (i = 0; i < 2; i++) {
366 s->sprite_offset[0][i] <<= shift_y;
367 s->sprite_offset[1][i] <<= shift_c;
368 s->sprite_delta[0][i] <<= shift_y;
369 s->sprite_delta[1][i] <<= shift_y;
370 ctx->sprite_shift[i] = 16;
372 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
378 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
379 int len = FFMIN(ctx->time_increment_bits + 3, 15);
384 check_marker(gb, "after new_pred");
390 * Decode the next video packet.
391 * @return <0 if something went wrong
393 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
395 MpegEncContext *s = &ctx->m;
397 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
398 int header_extension = 0, mb_num, len;
400 /* is there enough space left for a video packet + header */
401 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
404 for (len = 0; len < 32; len++)
405 if (get_bits1(&s->gb))
408 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
409 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
413 if (ctx->shape != RECT_SHAPE) {
414 header_extension = get_bits1(&s->gb);
415 // FIXME more stuff here
418 mb_num = get_bits(&s->gb, mb_num_bits);
419 if (mb_num >= s->mb_num) {
420 av_log(s->avctx, AV_LOG_ERROR,
421 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
425 s->mb_x = mb_num % s->mb_width;
426 s->mb_y = mb_num / s->mb_width;
428 if (ctx->shape != BIN_ONLY_SHAPE) {
429 int qscale = get_bits(&s->gb, s->quant_precision);
431 s->chroma_qscale = s->qscale = qscale;
434 if (ctx->shape == RECT_SHAPE)
435 header_extension = get_bits1(&s->gb);
437 if (header_extension) {
440 while (get_bits1(&s->gb) != 0)
443 check_marker(&s->gb, "before time_increment in video packed header");
444 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
445 check_marker(&s->gb, "before vop_coding_type in video packed header");
447 skip_bits(&s->gb, 2); /* vop coding type */
448 // FIXME not rect stuff here
450 if (ctx->shape != BIN_ONLY_SHAPE) {
451 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
452 // FIXME don't just ignore everything
453 if (s->pict_type == AV_PICTURE_TYPE_S &&
454 ctx->vol_sprite_usage == GMC_SPRITE) {
455 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
456 return AVERROR_INVALIDDATA;
457 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
460 // FIXME reduced res stuff here
462 if (s->pict_type != AV_PICTURE_TYPE_I) {
463 int f_code = get_bits(&s->gb, 3); /* fcode_for */
465 av_log(s->avctx, AV_LOG_ERROR,
466 "Error, video packet header damaged (f_code=0)\n");
468 if (s->pict_type == AV_PICTURE_TYPE_B) {
469 int b_code = get_bits(&s->gb, 3);
471 av_log(s->avctx, AV_LOG_ERROR,
472 "Error, video packet header damaged (b_code=0)\n");
477 decode_new_pred(ctx, &s->gb);
483 * Get the average motion vector for a GMC MB.
484 * @param n either 0 for the x component or 1 for y
485 * @return the average MV for a GMC MB
487 static inline int get_amv(Mpeg4DecContext *ctx, int n)
489 MpegEncContext *s = &ctx->m;
490 int x, y, mb_v, sum, dx, dy, shift;
491 int len = 1 << (s->f_code + 4);
492 const int a = s->sprite_warping_accuracy;
494 if (s->workaround_bugs & FF_BUG_AMV)
495 len >>= s->quarter_sample;
497 if (s->real_sprite_warping_points == 1) {
498 if (ctx->divx_version == 500 && ctx->divx_build == 413)
499 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
501 sum = RSHIFT(s->sprite_offset[0][n] << s->quarter_sample, a);
503 dx = s->sprite_delta[n][0];
504 dy = s->sprite_delta[n][1];
505 shift = ctx->sprite_shift[0];
507 dy -= 1 << (shift + a + 1);
509 dx -= 1 << (shift + a + 1);
510 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
513 for (y = 0; y < 16; y++) {
518 for (x = 0; x < 16; x++) {
523 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
535 * Decode the dc value.
536 * @param n block index (0-3 are luma, 4-5 are chroma)
537 * @param dir_ptr the prediction direction will be stored here
538 * @return the quantized dc
540 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
545 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
547 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
549 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
550 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
559 level = 2 * get_bits1(&s->gb) - 1;
561 if (get_bits1(&s->gb))
562 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
564 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
567 level = get_xbits(&s->gb, code);
571 if (get_bits1(&s->gb) == 0) { /* marker */
572 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
573 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
580 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
584 * Decode first partition.
585 * @return number of MBs decoded or <0 if an error occurred
587 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
589 MpegEncContext *s = &ctx->m;
591 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
593 /* decode first partition */
594 s->first_slice_line = 1;
595 for (; s->mb_y < s->mb_height; s->mb_y++) {
596 ff_init_block_index(s);
597 for (; s->mb_x < s->mb_width; s->mb_x++) {
598 const int xy = s->mb_x + s->mb_y * s->mb_stride;
603 ff_update_block_index(s);
604 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
605 s->first_slice_line = 0;
607 if (s->pict_type == AV_PICTURE_TYPE_I) {
611 if (show_bits_long(&s->gb, 19) == DC_MARKER)
614 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
616 av_log(s->avctx, AV_LOG_ERROR,
617 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
622 s->cbp_table[xy] = cbpc & 3;
623 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
627 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
629 s->current_picture.qscale_table[xy] = s->qscale;
631 s->mbintra_table[xy] = 1;
632 for (i = 0; i < 6; i++) {
634 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
636 av_log(s->avctx, AV_LOG_ERROR,
637 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
644 s->pred_dir_table[xy] = dir;
645 } else { /* P/S_TYPE */
646 int mx, my, pred_x, pred_y, bits;
647 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
648 const int stride = s->b8_stride * 2;
651 bits = show_bits(&s->gb, 17);
652 if (bits == MOTION_MARKER)
656 if (bits & 0x10000) {
658 if (s->pict_type == AV_PICTURE_TYPE_S &&
659 ctx->vol_sprite_usage == GMC_SPRITE) {
660 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
664 mx = get_amv(ctx, 0);
665 my = get_amv(ctx, 1);
667 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
674 mot_val[0 + stride] =
675 mot_val[2 + stride] = mx;
678 mot_val[1 + stride] =
679 mot_val[3 + stride] = my;
681 if (s->mbintra_table[xy])
682 ff_clean_intra_table_entries(s);
686 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
688 av_log(s->avctx, AV_LOG_ERROR,
689 "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
695 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
697 s->mb_intra = ((cbpc & 4) != 0);
700 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
701 s->mbintra_table[xy] = 1;
704 mot_val[0 + stride] =
705 mot_val[2 + stride] = 0;
708 mot_val[1 + stride] =
709 mot_val[3 + stride] = 0;
711 if (s->mbintra_table[xy])
712 ff_clean_intra_table_entries(s);
714 if (s->pict_type == AV_PICTURE_TYPE_S &&
715 ctx->vol_sprite_usage == GMC_SPRITE &&
717 s->mcsel = get_bits1(&s->gb);
721 if ((cbpc & 16) == 0) {
722 /* 16x16 motion prediction */
724 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
726 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
730 my = ff_h263_decode_motion(s, pred_y, s->f_code);
733 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
736 mx = get_amv(ctx, 0);
737 my = get_amv(ctx, 1);
738 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
745 mot_val[0 + stride] =
746 mot_val[2 + stride] = mx;
749 mot_val[1 + stride] =
750 mot_val[3 + stride] = my;
753 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
755 for (i = 0; i < 4; i++) {
756 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
757 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
761 my = ff_h263_decode_motion(s, pred_y, s->f_code);
778 * decode second partition.
779 * @return <0 if an error occurred
781 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
784 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
786 s->mb_x = s->resync_mb_x;
787 s->first_slice_line = 1;
788 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
789 ff_init_block_index(s);
790 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
791 const int xy = s->mb_x + s->mb_y * s->mb_stride;
794 ff_update_block_index(s);
795 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
796 s->first_slice_line = 0;
798 if (s->pict_type == AV_PICTURE_TYPE_I) {
799 int ac_pred = get_bits1(&s->gb);
800 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
802 av_log(s->avctx, AV_LOG_ERROR,
803 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
807 s->cbp_table[xy] |= cbpy << 2;
808 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
809 } else { /* P || S_TYPE */
810 if (IS_INTRA(s->current_picture.mb_type[xy])) {
813 int ac_pred = get_bits1(&s->gb);
814 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
817 av_log(s->avctx, AV_LOG_ERROR,
818 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
822 if (s->cbp_table[xy] & 8)
823 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
824 s->current_picture.qscale_table[xy] = s->qscale;
826 for (i = 0; i < 6; i++) {
828 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
830 av_log(s->avctx, AV_LOG_ERROR,
831 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
838 s->cbp_table[xy] &= 3; // remove dquant
839 s->cbp_table[xy] |= cbpy << 2;
840 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
841 s->pred_dir_table[xy] = dir;
842 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
843 s->current_picture.qscale_table[xy] = s->qscale;
844 s->cbp_table[xy] = 0;
846 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
849 av_log(s->avctx, AV_LOG_ERROR,
850 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
854 if (s->cbp_table[xy] & 8)
855 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
856 s->current_picture.qscale_table[xy] = s->qscale;
858 s->cbp_table[xy] &= 3; // remove dquant
859 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
863 if (mb_num >= mb_count)
871 * Decode the first and second partition.
872 * @return <0 if error (and sets error type in the error_status_table)
874 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
876 MpegEncContext *s = &ctx->m;
878 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
879 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
881 mb_num = mpeg4_decode_partition_a(ctx);
883 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
884 s->mb_x, s->mb_y, part_a_error);
888 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
889 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
890 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
891 s->mb_x, s->mb_y, part_a_error);
895 s->mb_num_left = mb_num;
897 if (s->pict_type == AV_PICTURE_TYPE_I) {
898 while (show_bits(&s->gb, 9) == 1)
899 skip_bits(&s->gb, 9);
900 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
901 av_log(s->avctx, AV_LOG_ERROR,
902 "marker missing after first I partition at %d %d\n",
907 while (show_bits(&s->gb, 10) == 1)
908 skip_bits(&s->gb, 10);
909 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
910 av_log(s->avctx, AV_LOG_ERROR,
911 "marker missing after first P partition at %d %d\n",
916 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
917 s->mb_x - 1, s->mb_y, part_a_end);
919 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
920 if (s->pict_type == AV_PICTURE_TYPE_P)
921 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
922 s->mb_x, s->mb_y, ER_DC_ERROR);
925 if (s->pict_type == AV_PICTURE_TYPE_P)
926 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
927 s->mb_x - 1, s->mb_y, ER_DC_END);
935 * @return <0 if an error occurred
937 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
938 int n, int coded, int intra, int rvlc)
940 MpegEncContext *s = &ctx->m;
941 int level, i, last, run, qmul, qadd;
942 int av_uninit(dc_pred_dir);
945 const uint8_t *scan_table;
947 // Note intra & rvlc should be optimized away if this is inlined
950 if (ctx->use_intra_dc_vlc) {
952 if (s->partitioned_frame) {
953 level = s->dc_val[0][s->block_index[n]];
955 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
957 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
958 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
960 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
968 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
974 rl = &ff_rvlc_rl_intra;
975 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
977 rl = &ff_mpeg4_rl_intra;
978 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
981 if (dc_pred_dir == 0)
982 scan_table = s->intra_v_scantable.permutated; /* left */
984 scan_table = s->intra_h_scantable.permutated; /* top */
986 scan_table = s->intra_scantable.permutated;
993 s->block_last_index[n] = i;
997 rl = &ff_rvlc_rl_inter;
999 rl = &ff_h263_rl_inter;
1001 scan_table = s->intra_scantable.permutated;
1003 if (s->mpeg_quant) {
1007 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1009 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1011 qmul = s->qscale << 1;
1012 qadd = (s->qscale - 1) | 1;
1014 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1016 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1020 OPEN_READER(re, &s->gb);
1022 UPDATE_CACHE(re, &s->gb);
1023 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1027 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1028 av_log(s->avctx, AV_LOG_ERROR,
1029 "1. marker bit missing in rvlc esc\n");
1032 SKIP_CACHE(re, &s->gb, 1);
1034 last = SHOW_UBITS(re, &s->gb, 1);
1035 SKIP_CACHE(re, &s->gb, 1);
1036 run = SHOW_UBITS(re, &s->gb, 6);
1037 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1038 UPDATE_CACHE(re, &s->gb);
1040 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1041 av_log(s->avctx, AV_LOG_ERROR,
1042 "2. marker bit missing in rvlc esc\n");
1045 SKIP_CACHE(re, &s->gb, 1);
1047 level = SHOW_UBITS(re, &s->gb, 11);
1048 SKIP_CACHE(re, &s->gb, 11);
1050 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1051 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1054 SKIP_CACHE(re, &s->gb, 5);
1056 level = level * qmul + qadd;
1057 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1058 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1065 cache = GET_CACHE(re, &s->gb);
1068 cache ^= 0xC0000000;
1070 if (cache & 0x80000000) {
1071 if (cache & 0x40000000) {
1073 SKIP_CACHE(re, &s->gb, 2);
1074 last = SHOW_UBITS(re, &s->gb, 1);
1075 SKIP_CACHE(re, &s->gb, 1);
1076 run = SHOW_UBITS(re, &s->gb, 6);
1077 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1078 UPDATE_CACHE(re, &s->gb);
1081 level = SHOW_SBITS(re, &s->gb, 12);
1082 LAST_SKIP_BITS(re, &s->gb, 12);
1084 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1085 av_log(s->avctx, AV_LOG_ERROR,
1086 "1. marker bit missing in 3. esc\n");
1089 SKIP_CACHE(re, &s->gb, 1);
1091 level = SHOW_SBITS(re, &s->gb, 12);
1092 SKIP_CACHE(re, &s->gb, 12);
1094 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1095 av_log(s->avctx, AV_LOG_ERROR,
1096 "2. marker bit missing in 3. esc\n");
1100 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1104 if (s->error_recognition >= FF_ER_COMPLIANT) {
1105 const int abs_level= FFABS(level);
1106 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1107 const int run1= run - rl->max_run[last][abs_level] - 1;
1108 if (abs_level <= rl->max_level[last][run]) {
1109 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1112 if (s->error_recognition > FF_ER_COMPLIANT) {
1113 if (abs_level <= rl->max_level[last][run]*2) {
1114 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1117 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1118 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1126 level = level * qmul + qadd;
1128 level = level * qmul - qadd;
1130 if ((unsigned)(level + 2048) > 4095) {
1131 if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1132 if (level > 2560 || level < -2560) {
1133 av_log(s->avctx, AV_LOG_ERROR,
1134 "|level| overflow in 3. esc, qp=%d\n",
1139 level = level < 0 ? -2048 : 2047;
1147 SKIP_BITS(re, &s->gb, 2);
1148 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1149 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1150 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1151 LAST_SKIP_BITS(re, &s->gb, 1);
1155 SKIP_BITS(re, &s->gb, 1);
1156 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1158 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1159 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1160 LAST_SKIP_BITS(re, &s->gb, 1);
1165 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1166 LAST_SKIP_BITS(re, &s->gb, 1);
1171 av_log(s->avctx, AV_LOG_ERROR,
1172 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1176 block[scan_table[i]] = level;
1180 block[scan_table[i]] = level;
1182 CLOSE_READER(re, &s->gb);
1187 if (!ctx->use_intra_dc_vlc) {
1188 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1190 i -= i >> 31; // if (i == -1) i = 0;
1193 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1195 i = 63; // FIXME not optimal
1197 s->block_last_index[n] = i;
1202 * decode partition C of one MB.
1203 * @return <0 if an error occurred
1205 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1207 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1209 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1211 mb_type = s->current_picture.mb_type[xy];
1212 cbp = s->cbp_table[xy];
1214 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1216 if (s->current_picture.qscale_table[xy] != s->qscale)
1217 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1219 if (s->pict_type == AV_PICTURE_TYPE_P ||
1220 s->pict_type == AV_PICTURE_TYPE_S) {
1222 for (i = 0; i < 4; i++) {
1223 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1224 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1226 s->mb_intra = IS_INTRA(mb_type);
1228 if (IS_SKIP(mb_type)) {
1230 for (i = 0; i < 6; i++)
1231 s->block_last_index[i] = -1;
1232 s->mv_dir = MV_DIR_FORWARD;
1233 s->mv_type = MV_TYPE_16X16;
1234 if (s->pict_type == AV_PICTURE_TYPE_S
1235 && ctx->vol_sprite_usage == GMC_SPRITE) {
1242 } else if (s->mb_intra) {
1243 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1244 } else if (!s->mb_intra) {
1245 // s->mcsel = 0; // FIXME do we need to init that?
1247 s->mv_dir = MV_DIR_FORWARD;
1248 if (IS_8X8(mb_type)) {
1249 s->mv_type = MV_TYPE_8X8;
1251 s->mv_type = MV_TYPE_16X16;
1254 } else { /* I-Frame */
1256 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1259 if (!IS_SKIP(mb_type)) {
1261 s->dsp.clear_blocks(s->block[0]);
1262 /* decode each block */
1263 for (i = 0; i < 6; i++) {
1264 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1265 av_log(s->avctx, AV_LOG_ERROR,
1266 "texture corrupted at %d %d %d\n",
1267 s->mb_x, s->mb_y, s->mb_intra);
1274 /* per-MB end of slice check */
1275 if (--s->mb_num_left <= 0) {
1276 if (mpeg4_is_resync(ctx))
1281 if (mpeg4_is_resync(ctx)) {
1282 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1283 if (s->cbp_table[xy + delta])
1290 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1292 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1293 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1295 static int8_t quant_tab[4] = { -1, -2, 1, 2 };
1296 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1298 av_assert2(s->h263_pred);
1300 if (s->pict_type == AV_PICTURE_TYPE_P ||
1301 s->pict_type == AV_PICTURE_TYPE_S) {
1303 if (get_bits1(&s->gb)) {
1306 for (i = 0; i < 6; i++)
1307 s->block_last_index[i] = -1;
1308 s->mv_dir = MV_DIR_FORWARD;
1309 s->mv_type = MV_TYPE_16X16;
1310 if (s->pict_type == AV_PICTURE_TYPE_S &&
1311 ctx->vol_sprite_usage == GMC_SPRITE) {
1312 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1317 s->mv[0][0][0] = get_amv(ctx, 0);
1318 s->mv[0][0][1] = get_amv(ctx, 1);
1321 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1331 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1333 av_log(s->avctx, AV_LOG_ERROR,
1334 "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1337 } while (cbpc == 20);
1339 s->dsp.clear_blocks(s->block[0]);
1341 s->mb_intra = ((cbpc & 4) != 0);
1345 if (s->pict_type == AV_PICTURE_TYPE_S &&
1346 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1347 s->mcsel = get_bits1(&s->gb);
1350 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1352 cbp = (cbpc & 3) | (cbpy << 2);
1354 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1355 if ((!s->progressive_sequence) &&
1356 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1357 s->interlaced_dct = get_bits1(&s->gb);
1359 s->mv_dir = MV_DIR_FORWARD;
1360 if ((cbpc & 16) == 0) {
1362 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1365 /* 16x16 global motion prediction */
1366 s->mv_type = MV_TYPE_16X16;
1367 mx = get_amv(ctx, 0);
1368 my = get_amv(ctx, 1);
1369 s->mv[0][0][0] = mx;
1370 s->mv[0][0][1] = my;
1371 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1372 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1375 /* 16x8 field motion prediction */
1376 s->mv_type = MV_TYPE_FIELD;
1378 s->field_select[0][0] = get_bits1(&s->gb);
1379 s->field_select[0][1] = get_bits1(&s->gb);
1381 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1383 for (i = 0; i < 2; i++) {
1384 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1388 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1392 s->mv[0][i][0] = mx;
1393 s->mv[0][i][1] = my;
1396 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1397 /* 16x16 motion prediction */
1398 s->mv_type = MV_TYPE_16X16;
1399 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1400 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1405 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1409 s->mv[0][0][0] = mx;
1410 s->mv[0][0][1] = my;
1413 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1414 s->mv_type = MV_TYPE_8X8;
1415 for (i = 0; i < 4; i++) {
1416 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1417 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1421 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1424 s->mv[0][i][0] = mx;
1425 s->mv[0][i][1] = my;
1430 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1431 int modb1; // first bit of modb
1432 int modb2; // second bit of modb
1435 s->mb_intra = 0; // B-frames never contain intra blocks
1436 s->mcsel = 0; // ... true gmc blocks
1439 for (i = 0; i < 2; i++) {
1440 s->last_mv[i][0][0] =
1441 s->last_mv[i][0][1] =
1442 s->last_mv[i][1][0] =
1443 s->last_mv[i][1][1] = 0;
1446 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1449 /* if we skipped it in the future P Frame than skip it now too */
1450 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1452 if (s->mb_skipped) {
1454 for (i = 0; i < 6; i++)
1455 s->block_last_index[i] = -1;
1457 s->mv_dir = MV_DIR_FORWARD;
1458 s->mv_type = MV_TYPE_16X16;
1463 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1469 modb1 = get_bits1(&s->gb);
1471 // like MB_TYPE_B_DIRECT but no vectors coded
1472 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1475 modb2 = get_bits1(&s->gb);
1476 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1478 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1481 mb_type = mb_type_b_map[mb_type];
1485 s->dsp.clear_blocks(s->block[0]);
1486 cbp = get_bits(&s->gb, 6);
1489 if ((!IS_DIRECT(mb_type)) && cbp) {
1490 if (get_bits1(&s->gb))
1491 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1494 if (!s->progressive_sequence) {
1496 s->interlaced_dct = get_bits1(&s->gb);
1498 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1499 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1500 mb_type &= ~MB_TYPE_16x16;
1502 if (USES_LIST(mb_type, 0)) {
1503 s->field_select[0][0] = get_bits1(&s->gb);
1504 s->field_select[0][1] = get_bits1(&s->gb);
1506 if (USES_LIST(mb_type, 1)) {
1507 s->field_select[1][0] = get_bits1(&s->gb);
1508 s->field_select[1][1] = get_bits1(&s->gb);
1514 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1515 s->mv_type = MV_TYPE_16X16;
1517 if (USES_LIST(mb_type, 0)) {
1518 s->mv_dir = MV_DIR_FORWARD;
1520 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1521 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1522 s->last_mv[0][1][0] =
1523 s->last_mv[0][0][0] =
1524 s->mv[0][0][0] = mx;
1525 s->last_mv[0][1][1] =
1526 s->last_mv[0][0][1] =
1527 s->mv[0][0][1] = my;
1530 if (USES_LIST(mb_type, 1)) {
1531 s->mv_dir |= MV_DIR_BACKWARD;
1533 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1534 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1535 s->last_mv[1][1][0] =
1536 s->last_mv[1][0][0] =
1537 s->mv[1][0][0] = mx;
1538 s->last_mv[1][1][1] =
1539 s->last_mv[1][0][1] =
1540 s->mv[1][0][1] = my;
1542 } else if (!IS_DIRECT(mb_type)) {
1543 s->mv_type = MV_TYPE_FIELD;
1545 if (USES_LIST(mb_type, 0)) {
1546 s->mv_dir = MV_DIR_FORWARD;
1548 for (i = 0; i < 2; i++) {
1549 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1550 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1551 s->last_mv[0][i][0] =
1552 s->mv[0][i][0] = mx;
1553 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1557 if (USES_LIST(mb_type, 1)) {
1558 s->mv_dir |= MV_DIR_BACKWARD;
1560 for (i = 0; i < 2; i++) {
1561 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1562 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1563 s->last_mv[1][i][0] =
1564 s->mv[1][i][0] = mx;
1565 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1571 if (IS_DIRECT(mb_type)) {
1572 if (IS_SKIP(mb_type)) {
1576 mx = ff_h263_decode_motion(s, 0, 1);
1577 my = ff_h263_decode_motion(s, 0, 1);
1580 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1581 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1583 s->current_picture.mb_type[xy] = mb_type;
1584 } else { /* I-Frame */
1586 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1588 av_log(s->avctx, AV_LOG_ERROR,
1589 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1592 } while (cbpc == 8);
1598 s->ac_pred = get_bits1(&s->gb);
1600 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1602 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1604 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1606 av_log(s->avctx, AV_LOG_ERROR,
1607 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1610 cbp = (cbpc & 3) | (cbpy << 2);
1612 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1615 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1617 if (!s->progressive_sequence)
1618 s->interlaced_dct = get_bits1(&s->gb);
1620 s->dsp.clear_blocks(s->block[0]);
1621 /* decode each block */
1622 for (i = 0; i < 6; i++) {
1623 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1630 /* decode each block */
1631 for (i = 0; i < 6; i++) {
1632 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1638 /* per-MB end of slice check */
1639 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1640 int next = mpeg4_is_resync(ctx);
1642 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1644 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1647 if (s->pict_type == AV_PICTURE_TYPE_B) {
1648 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1649 ff_thread_await_progress(&s->next_picture_ptr->tf,
1650 (s->mb_x + delta >= s->mb_width)
1651 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1653 if (s->next_picture.mbskip_table[xy + delta])
1664 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1666 int hours, minutes, seconds;
1668 if (!show_bits(gb, 23)) {
1669 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1673 hours = get_bits(gb, 5);
1674 minutes = get_bits(gb, 6);
1676 seconds = get_bits(gb, 6);
1678 s->time_base = seconds + 60*(minutes + 60*hours);
1686 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1689 s->avctx->profile = get_bits(gb, 4);
1690 s->avctx->level = get_bits(gb, 4);
1692 // for Simple profile, level 0
1693 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1694 s->avctx->level = 0;
1700 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1702 MpegEncContext *s = &ctx->m;
1703 int width, height, vo_ver_id;
1706 skip_bits(gb, 1); /* random access */
1707 s->vo_type = get_bits(gb, 8);
1708 if (get_bits1(gb) != 0) { /* is_ol_id */
1709 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1710 skip_bits(gb, 3); /* vo_priority */
1714 s->aspect_ratio_info = get_bits(gb, 4);
1715 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1716 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1717 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1719 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1722 if ((s->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1723 int chroma_format = get_bits(gb, 2);
1724 if (chroma_format != CHROMA_420)
1725 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1727 s->low_delay = get_bits1(gb);
1728 if (get_bits1(gb)) { /* vbv parameters */
1729 get_bits(gb, 15); /* first_half_bitrate */
1730 skip_bits1(gb); /* marker */
1731 get_bits(gb, 15); /* latter_half_bitrate */
1732 skip_bits1(gb); /* marker */
1733 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1734 skip_bits1(gb); /* marker */
1735 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1736 get_bits(gb, 11); /* first_half_vbv_occupancy */
1737 skip_bits1(gb); /* marker */
1738 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1739 skip_bits1(gb); /* marker */
1742 /* is setting low delay flag only once the smartest thing to do?
1743 * low delay detection won't be overriden. */
1744 if (s->picture_number == 0)
1748 ctx->shape = get_bits(gb, 2); /* vol shape */
1749 if (ctx->shape != RECT_SHAPE)
1750 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1751 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1752 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1753 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1756 check_marker(gb, "before time_increment_resolution");
1758 s->avctx->time_base.den = get_bits(gb, 16);
1759 if (!s->avctx->time_base.den) {
1760 av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
1761 s->avctx->time_base.num = 0;
1765 ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
1766 if (ctx->time_increment_bits < 1)
1767 ctx->time_increment_bits = 1;
1769 check_marker(gb, "before fixed_vop_rate");
1771 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1772 s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits);
1774 s->avctx->time_base.num = 1;
1778 if (ctx->shape != BIN_ONLY_SHAPE) {
1779 if (ctx->shape == RECT_SHAPE) {
1780 check_marker(gb, "before width");
1781 width = get_bits(gb, 13);
1782 check_marker(gb, "before height");
1783 height = get_bits(gb, 13);
1784 check_marker(gb, "after height");
1785 if (width && height && /* they should be non zero but who knows */
1786 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1787 if (s->width && s->height &&
1788 (s->width != width || s->height != height))
1789 s->context_reinit = 1;
1795 s->progressive_sequence =
1796 s->progressive_frame = get_bits1(gb) ^ 1;
1797 s->interlaced_dct = 0;
1798 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1799 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1800 "MPEG4 OBMC not supported (very likely buggy encoder)\n");
1802 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1804 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1806 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1807 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1808 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1809 ctx->vol_sprite_usage == GMC_SPRITE) {
1810 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1811 skip_bits(gb, 13); // sprite_width
1812 skip_bits1(gb); /* marker */
1813 skip_bits(gb, 13); // sprite_height
1814 skip_bits1(gb); /* marker */
1815 skip_bits(gb, 13); // sprite_left
1816 skip_bits1(gb); /* marker */
1817 skip_bits(gb, 13); // sprite_top
1818 skip_bits1(gb); /* marker */
1820 ctx->num_sprite_warping_points = get_bits(gb, 6);
1821 if (ctx->num_sprite_warping_points > 3) {
1822 av_log(s->avctx, AV_LOG_ERROR,
1823 "%d sprite_warping_points\n",
1824 ctx->num_sprite_warping_points);
1825 ctx->num_sprite_warping_points = 0;
1828 s->sprite_warping_accuracy = get_bits(gb, 2);
1829 ctx->sprite_brightness_change = get_bits1(gb);
1830 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1831 skip_bits1(gb); // low_latency_sprite
1833 // FIXME sadct disable bit if verid!=1 && shape not rect
1835 if (get_bits1(gb) == 1) { /* not_8_bit */
1836 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1837 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1838 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1839 if (s->quant_precision != 5)
1840 av_log(s->avctx, AV_LOG_ERROR,
1841 "quant precision %d\n", s->quant_precision);
1842 if (s->quant_precision<3 || s->quant_precision>9) {
1843 s->quant_precision = 5;
1846 s->quant_precision = 5;
1849 // FIXME a bunch of grayscale shape things
1851 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1854 /* load default matrixes */
1855 for (i = 0; i < 64; i++) {
1856 int j = s->dsp.idct_permutation[i];
1857 v = ff_mpeg4_default_intra_matrix[i];
1858 s->intra_matrix[j] = v;
1859 s->chroma_intra_matrix[j] = v;
1861 v = ff_mpeg4_default_non_intra_matrix[i];
1862 s->inter_matrix[j] = v;
1863 s->chroma_inter_matrix[j] = v;
1866 /* load custom intra matrix */
1867 if (get_bits1(gb)) {
1869 for (i = 0; i < 64; i++) {
1871 v = get_bits(gb, 8);
1876 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1877 s->intra_matrix[j] = last;
1878 s->chroma_intra_matrix[j] = last;
1881 /* replicate last value */
1882 for (; i < 64; i++) {
1883 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1884 s->intra_matrix[j] = last;
1885 s->chroma_intra_matrix[j] = last;
1889 /* load custom non intra matrix */
1890 if (get_bits1(gb)) {
1892 for (i = 0; i < 64; i++) {
1894 v = get_bits(gb, 8);
1899 j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1900 s->inter_matrix[j] = v;
1901 s->chroma_inter_matrix[j] = v;
1904 /* replicate last value */
1905 for (; i < 64; i++) {
1906 int j = s->dsp.idct_permutation[ff_zigzag_direct[i]];
1907 s->inter_matrix[j] = last;
1908 s->chroma_inter_matrix[j] = last;
1912 // FIXME a bunch of grayscale shape things
1916 s->quarter_sample = get_bits1(gb);
1918 s->quarter_sample = 0;
1920 if (get_bits_left(gb) < 4) {
1921 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1922 return AVERROR_INVALIDDATA;
1925 if (!get_bits1(gb)) {
1926 int pos = get_bits_count(gb);
1927 int estimation_method = get_bits(gb, 2);
1928 if (estimation_method < 2) {
1929 if (!get_bits1(gb)) {
1930 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1931 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1932 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1933 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1934 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1935 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upampling */
1937 if (!get_bits1(gb)) {
1938 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1939 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1940 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1941 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1943 if (!check_marker(gb, "in complexity estimation part 1")) {
1944 skip_bits_long(gb, pos - get_bits_count(gb));
1947 if (!get_bits1(gb)) {
1948 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1949 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1950 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1951 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1953 if (!get_bits1(gb)) {
1954 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1955 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1956 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1957 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
1958 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
1959 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
1961 if (!check_marker(gb, "in complexity estimation part 2")) {
1962 skip_bits_long(gb, pos - get_bits_count(gb));
1965 if (estimation_method == 1) {
1966 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
1967 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
1970 av_log(s->avctx, AV_LOG_ERROR,
1971 "Invalid Complexity estimation method %d\n",
1976 ctx->cplx_estimation_trash_i =
1977 ctx->cplx_estimation_trash_p =
1978 ctx->cplx_estimation_trash_b = 0;
1981 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
1983 s->data_partitioning = get_bits1(gb);
1984 if (s->data_partitioning)
1985 ctx->rvlc = get_bits1(gb);
1987 if (vo_ver_id != 1) {
1988 ctx->new_pred = get_bits1(gb);
1989 if (ctx->new_pred) {
1990 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
1991 skip_bits(gb, 2); /* requested upstream message type */
1992 skip_bits1(gb); /* newpred segment type */
1994 if (get_bits1(gb)) // reduced_res_vop
1995 av_log(s->avctx, AV_LOG_ERROR,
1996 "reduced resolution VOP not supported\n");
2001 ctx->scalability = get_bits1(gb);
2003 if (ctx->scalability) {
2004 GetBitContext bak = *gb;
2005 int h_sampling_factor_n;
2006 int h_sampling_factor_m;
2007 int v_sampling_factor_n;
2008 int v_sampling_factor_m;
2010 skip_bits1(gb); // hierarchy_type
2011 skip_bits(gb, 4); /* ref_layer_id */
2012 skip_bits1(gb); /* ref_layer_sampling_dir */
2013 h_sampling_factor_n = get_bits(gb, 5);
2014 h_sampling_factor_m = get_bits(gb, 5);
2015 v_sampling_factor_n = get_bits(gb, 5);
2016 v_sampling_factor_m = get_bits(gb, 5);
2017 ctx->enhancement_type = get_bits1(gb);
2019 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2020 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2021 /* illegal scalability header (VERY broken encoder),
2022 * trying to workaround */
2023 ctx->scalability = 0;
2026 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2028 // bin shape stuff FIXME
2032 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2033 av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, %s%s%s%s\n",
2034 s->avctx->time_base.num, s->avctx->time_base.den,
2035 ctx->time_increment_bits,
2037 s->progressive_sequence,
2038 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2039 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2047 * Decode the user data stuff in the header.
2048 * Also initializes divx/xvid/lavc_version/build.
2050 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2052 MpegEncContext *s = &ctx->m;
2056 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2059 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2060 if (show_bits(gb, 23) == 0)
2062 buf[i] = get_bits(gb, 8);
2066 /* divx detection */
2067 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2069 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2071 ctx->divx_version = ver;
2072 ctx->divx_build = build;
2073 s->divx_packed = e == 3 && last == 'p';
2074 if (s->divx_packed && !ctx->showed_packed_warning) {
2075 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2076 "wasteful way to store B-frames ('packed B-frames'). "
2077 "Consider using a tool like VirtualDub or avidemux to fix it.\n");
2078 ctx->showed_packed_warning = 1;
2082 /* libavcodec detection */
2083 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2085 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2087 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2089 build = (ver << 16) + (ver2 << 8) + ver3;
2092 if (strcmp(buf, "ffmpeg") == 0)
2093 ctx->lavc_build = 4600;
2096 ctx->lavc_build = build;
2098 /* Xvid detection */
2099 e = sscanf(buf, "XviD%d", &build);
2101 ctx->xvid_build = build;
2106 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2108 Mpeg4DecContext *ctx = avctx->priv_data;
2109 MpegEncContext *s = &ctx->m;
2111 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2112 if (s->stream_codec_tag == AV_RL32("XVID") ||
2113 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 s->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->dsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2158 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2159 s->dsp.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" : "");
2208 if (s->codec_id == AV_CODEC_ID_MPEG4 && ctx->xvid_build >= 0 &&
2209 avctx->idct_algo == FF_IDCT_AUTO &&
2210 (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
2211 avctx->idct_algo = FF_IDCT_XVIDMMX;
2212 ff_dct_common_init(s);
2219 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2221 MpegEncContext *s = &ctx->m;
2222 int time_incr, time_increment;
2225 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2226 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2227 s->vol_control_parameters == 0 && !(s->flags & CODEC_FLAG_LOW_DELAY)) {
2228 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
2232 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2233 if (s->partitioned_frame)
2234 s->decode_mb = mpeg4_decode_partitioned_mb;
2236 s->decode_mb = mpeg4_decode_mb;
2239 while (get_bits1(gb) != 0)
2242 check_marker(gb, "before time_increment");
2244 if (ctx->time_increment_bits == 0 ||
2245 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2246 av_log(s->avctx, AV_LOG_ERROR,
2247 "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
2249 for (ctx->time_increment_bits = 1;
2250 ctx->time_increment_bits < 16;
2251 ctx->time_increment_bits++) {
2252 if (s->pict_type == AV_PICTURE_TYPE_P ||
2253 (s->pict_type == AV_PICTURE_TYPE_S &&
2254 ctx->vol_sprite_usage == GMC_SPRITE)) {
2255 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2257 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2261 av_log(s->avctx, AV_LOG_ERROR,
2262 "my guess is %d bits ;)\n", ctx->time_increment_bits);
2263 if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<ctx->time_increment_bits) {
2264 s->avctx->time_base.den = 1<<ctx->time_increment_bits;
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->time_base.den + 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->time_base.den;
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->time_base.den + 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->time_base.num)
2315 pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
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 skip_bits1(gb); /* marker */
2348 skip_bits(gb, 13); /* height */
2349 skip_bits1(gb); /* marker */
2350 skip_bits(gb, 13); /* hor_spat_ref */
2351 skip_bits1(gb); /* marker */
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");
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->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2383 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2384 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2385 ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2387 ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2388 ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2389 ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2390 ff_init_scantable(s->dsp.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 -1; // 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 -1; // 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 -1; // 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 s->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 && s->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;
2500 /* search next start code */
2503 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2505 if (get_bits(gb, 8) == 0xF0)
2511 if (get_bits_count(gb) >= gb->size_in_bits) {
2512 if (gb->size_in_bits == 8 &&
2513 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2514 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2515 return FRAME_SKIPPED; // divx bug
2517 return -1; // end of stream
2520 /* use the bits after the test */
2521 v = get_bits(gb, 8);
2522 startcode = ((startcode << 8) | v) & 0xffffffff;
2524 if ((startcode & 0xFFFFFF00) != 0x100)
2525 continue; // no startcode
2527 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2528 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2529 if (startcode <= 0x11F)
2530 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2531 else if (startcode <= 0x12F)
2532 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2533 else if (startcode <= 0x13F)
2534 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2535 else if (startcode <= 0x15F)
2536 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2537 else if (startcode <= 0x1AF)
2538 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2539 else if (startcode == 0x1B0)
2540 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2541 else if (startcode == 0x1B1)
2542 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2543 else if (startcode == 0x1B2)
2544 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2545 else if (startcode == 0x1B3)
2546 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2547 else if (startcode == 0x1B4)
2548 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2549 else if (startcode == 0x1B5)
2550 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2551 else if (startcode == 0x1B6)
2552 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2553 else if (startcode == 0x1B7)
2554 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2555 else if (startcode == 0x1B8)
2556 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2557 else if (startcode == 0x1B9)
2558 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2559 else if (startcode == 0x1BA)
2560 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2561 else if (startcode == 0x1BB)
2562 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2563 else if (startcode == 0x1BC)
2564 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2565 else if (startcode == 0x1BD)
2566 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2567 else if (startcode == 0x1BE)
2568 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2569 else if (startcode == 0x1BF)
2570 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2571 else if (startcode == 0x1C0)
2572 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2573 else if (startcode == 0x1C1)
2574 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2575 else if (startcode == 0x1C2)
2576 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2577 else if (startcode == 0x1C3)
2578 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2579 else if (startcode <= 0x1C5)
2580 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2581 else if (startcode <= 0x1FF)
2582 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2583 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2586 if (startcode >= 0x120 && startcode <= 0x12F) {
2587 if (decode_vol_header(ctx, gb) < 0)
2589 } else if (startcode == USER_DATA_STARTCODE) {
2590 decode_user_data(ctx, gb);
2591 } else if (startcode == GOP_STARTCODE) {
2592 mpeg4_decode_gop_header(s, gb);
2593 } else if (startcode == VOS_STARTCODE) {
2594 mpeg4_decode_profile_level(s, gb);
2595 } else if (startcode == VOP_STARTCODE) {
2604 if (s->flags & CODEC_FLAG_LOW_DELAY)
2606 s->avctx->has_b_frames = !s->low_delay;
2608 return decode_vop_header(ctx, gb);
2611 av_cold void ff_mpeg4videodec_static_init(void) {
2612 static int done = 0;
2615 ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2616 ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2617 ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2618 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2619 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2620 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2621 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2622 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2623 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2624 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2625 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2626 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2627 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2628 &ff_sprite_trajectory_tab[0][1], 4, 2,
2629 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2630 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2631 &ff_mb_type_b_tab[0][1], 2, 1,
2632 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2637 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2639 Mpeg4DecContext *ctx = avctx->priv_data;
2640 MpegEncContext *s = &ctx->m;
2642 /* divx 5.01+ bitstream reorder stuff */
2643 /* Since this clobbers the input buffer and hwaccel codecs still need the
2644 * data during hwaccel->end_frame we should not do this any earlier */
2645 if (s->divx_packed) {
2646 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2647 int startcode_found = 0;
2649 if (buf_size - current_pos > 7) {
2652 for (i = current_pos; i < buf_size - 4; i++)
2657 buf[i + 3] == 0xB6) {
2658 startcode_found = !(buf[i + 4] & 0x40);
2663 if (startcode_found) {
2664 av_fast_padded_malloc(&s->bitstream_buffer,
2665 &s->allocated_bitstream_buffer_size,
2666 buf_size - current_pos);
2667 if (!s->bitstream_buffer)
2668 return AVERROR(ENOMEM);
2669 memcpy(s->bitstream_buffer, buf + current_pos,
2670 buf_size - current_pos);
2671 s->bitstream_buffer_size = buf_size - current_pos;
2678 static int mpeg4_update_thread_context(AVCodecContext *dst,
2679 const AVCodecContext *src)
2681 Mpeg4DecContext *s = dst->priv_data;
2682 const Mpeg4DecContext *s1 = src->priv_data;
2684 int ret = ff_mpeg_update_thread_context(dst, src);
2689 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2694 static av_cold int decode_init(AVCodecContext *avctx)
2696 Mpeg4DecContext *ctx = avctx->priv_data;
2697 MpegEncContext *s = &ctx->m;
2703 ctx->lavc_build = -1;
2705 if ((ret = ff_h263_decode_init(avctx)) < 0)
2708 ff_mpeg4videodec_static_init();
2711 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2712 s->decode_mb = mpeg4_decode_mb;
2713 ctx->time_increment_bits = 4; /* default value for broken headers */
2715 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2716 avctx->internal->allocate_progress = 1;
2721 static const AVProfile mpeg4_video_profiles[] = {
2722 { FF_PROFILE_MPEG4_SIMPLE, "Simple Profile" },
2723 { FF_PROFILE_MPEG4_SIMPLE_SCALABLE, "Simple Scalable Profile" },
2724 { FF_PROFILE_MPEG4_CORE, "Core Profile" },
2725 { FF_PROFILE_MPEG4_MAIN, "Main Profile" },
2726 { FF_PROFILE_MPEG4_N_BIT, "N-bit Profile" },
2727 { FF_PROFILE_MPEG4_SCALABLE_TEXTURE, "Scalable Texture Profile" },
2728 { FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION, "Simple Face Animation Profile" },
2729 { FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE, "Basic Animated Texture Profile" },
2730 { FF_PROFILE_MPEG4_HYBRID, "Hybrid Profile" },
2731 { FF_PROFILE_MPEG4_ADVANCED_REAL_TIME, "Advanced Real Time Simple Profile" },
2732 { FF_PROFILE_MPEG4_CORE_SCALABLE, "Code Scalable Profile" },
2733 { FF_PROFILE_MPEG4_ADVANCED_CODING, "Advanced Coding Profile" },
2734 { FF_PROFILE_MPEG4_ADVANCED_CORE, "Advanced Core Profile" },
2735 { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
2736 { FF_PROFILE_MPEG4_SIMPLE_STUDIO, "Simple Studio Profile" },
2737 { FF_PROFILE_MPEG4_ADVANCED_SIMPLE, "Advanced Simple Profile" },
2738 { FF_PROFILE_UNKNOWN },
2741 static const AVOption mpeg4_options[] = {
2742 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2743 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
2747 static const AVClass mpeg4_class = {
2748 "MPEG4 Video Decoder",
2749 av_default_item_name,
2751 LIBAVUTIL_VERSION_INT,
2754 static const AVClass mpeg4_vdpau_class = {
2755 "MPEG4 Video VDPAU Decoder",
2756 av_default_item_name,
2758 LIBAVUTIL_VERSION_INT,
2761 AVCodec ff_mpeg4_decoder = {
2763 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2764 .type = AVMEDIA_TYPE_VIDEO,
2765 .id = AV_CODEC_ID_MPEG4,
2766 .priv_data_size = sizeof(Mpeg4DecContext),
2767 .init = decode_init,
2768 .close = ff_h263_decode_end,
2769 .decode = ff_h263_decode_frame,
2770 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
2771 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2772 CODEC_CAP_FRAME_THREADS,
2773 .flush = ff_mpeg_flush,
2775 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2776 .profiles = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
2777 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2778 .priv_class = &mpeg4_class,
2782 #if CONFIG_MPEG4_VDPAU_DECODER
2783 AVCodec ff_mpeg4_vdpau_decoder = {
2784 .name = "mpeg4_vdpau",
2785 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2786 .type = AVMEDIA_TYPE_VIDEO,
2787 .id = AV_CODEC_ID_MPEG4,
2788 .priv_data_size = sizeof(MpegEncContext),
2789 .init = decode_init,
2790 .close = ff_h263_decode_end,
2791 .decode = ff_h263_decode_frame,
2792 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
2793 CODEC_CAP_HWACCEL_VDPAU,
2794 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2796 .priv_class = &mpeg4_vdpau_class,