3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #define UNCHECKED_BITSTREAM_READER 1
25 #include "libavutil/internal.h"
26 #include "libavutil/opt.h"
27 #include "error_resilience.h"
30 #include "mpegutils.h"
31 #include "mpegvideo.h"
32 #include "mpegvideodata.h"
33 #include "mpeg4video.h"
39 /* The defines below define the number of bits that are read at once for
40 * reading vlc values. Changing these may improve speed and data cache needs
41 * be aware though that decreasing them may need the number of stages that is
42 * passed to get_vlc* to be increased. */
43 #define SPRITE_TRAJ_VLC_BITS 6
45 #define MB_TYPE_B_VLC_BITS 4
47 static VLC dc_lum, dc_chrom;
48 static VLC sprite_trajectory;
49 static VLC mb_type_b_vlc;
51 static const int mb_type_b_map[4] = {
52 MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
53 MB_TYPE_L0L1 | MB_TYPE_16x16,
54 MB_TYPE_L1 | MB_TYPE_16x16,
55 MB_TYPE_L0 | MB_TYPE_16x16,
60 * @param n block index (0-3 are luma, 4-5 are chroma)
61 * @param dir the ac prediction direction
63 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
66 int16_t *ac_val, *ac_val1;
67 int8_t *const qscale_table = s->current_picture.qscale_table;
70 ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
74 const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
78 if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
81 for (i = 1; i < 8; i++)
82 block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
84 /* different qscale, we must rescale */
85 for (i = 1; i < 8; i++)
86 block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
89 const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
91 ac_val -= 16 * s->block_wrap[n];
93 if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
96 for (i = 1; i < 8; i++)
97 block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
99 /* different qscale, we must rescale */
100 for (i = 1; i < 8; i++)
101 block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
106 for (i = 1; i < 8; i++)
107 ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
110 for (i = 1; i < 8; i++)
111 ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
115 * check if the next stuff is a resync marker or the end.
118 static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
120 MpegEncContext *s = &ctx->m;
121 int bits_count = get_bits_count(&s->gb);
122 int v = show_bits(&s->gb, 16);
124 if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
128 if (s->pict_type == AV_PICTURE_TYPE_B ||
129 (v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
131 skip_bits(&s->gb, 8 + s->pict_type);
132 bits_count += 8 + s->pict_type;
133 v = show_bits(&s->gb, 16);
136 if (bits_count + 8 >= s->gb.size_in_bits) {
138 v |= 0x7F >> (7 - (bits_count & 7));
143 if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
145 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
146 GetBitContext gb = s->gb;
148 skip_bits(&s->gb, 1);
149 align_get_bits(&s->gb);
151 for (len = 0; len < 32; len++)
152 if (get_bits1(&s->gb))
155 mb_num = get_bits(&s->gb, mb_num_bits);
156 if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
161 if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
168 static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
170 MpegEncContext *s = &ctx->m;
171 int a = 2 << s->sprite_warping_accuracy;
172 int rho = 3 - s->sprite_warping_accuracy;
178 int min_ab, i, w2, h2, w3, h3;
179 int sprite_ref[4][2];
180 int virtual_ref[2][2];
182 // only true for rectangle shapes
183 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
184 { 0, s->height }, { s->width, s->height } };
185 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
187 if (w <= 0 || h <= 0)
188 return AVERROR_INVALIDDATA;
190 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
194 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
196 x = get_xbits(gb, length);
198 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
199 check_marker(s->avctx, gb, "before sprite_trajectory");
201 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
203 y = get_xbits(gb, length);
205 check_marker(s->avctx, gb, "after sprite_trajectory");
206 ctx->sprite_traj[i][0] = d[i][0] = x;
207 ctx->sprite_traj[i][1] = d[i][1] = y;
210 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
212 while ((1 << alpha) < w)
214 while ((1 << beta) < h)
215 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
219 // Note, the 4th point isn't used for GMC
220 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
221 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
222 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
223 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
224 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
225 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
226 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
228 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
229 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
230 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
231 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
232 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
233 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
235 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
236 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
238 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
239 * because of that...). Perhaps it should be reordered to be more readable.
240 * The idea behind this virtual_ref mess is to be able to use shifts later
241 * per pixel instead of divides so the distance between points is converted
242 * from w&h based to w2&h2 based which are of the 2^x form. */
243 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
244 ROUNDED_DIV(((w - w2) *
245 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
246 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
247 virtual_ref[0][1] = 16 * vop_ref[0][1] +
248 ROUNDED_DIV(((w - w2) *
249 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
250 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
251 virtual_ref[1][0] = 16 * vop_ref[0][0] +
252 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
253 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
254 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
255 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
256 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
258 switch (ctx->num_sprite_warping_points) {
260 s->sprite_offset[0][0] =
261 s->sprite_offset[0][1] =
262 s->sprite_offset[1][0] =
263 s->sprite_offset[1][1] = 0;
264 s->sprite_delta[0][0] = a;
265 s->sprite_delta[0][1] =
266 s->sprite_delta[1][0] = 0;
267 s->sprite_delta[1][1] = a;
268 ctx->sprite_shift[0] =
269 ctx->sprite_shift[1] = 0;
272 s->sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
273 s->sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
274 s->sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
275 a * (vop_ref[0][0] / 2);
276 s->sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
277 a * (vop_ref[0][1] / 2);
278 s->sprite_delta[0][0] = a;
279 s->sprite_delta[0][1] =
280 s->sprite_delta[1][0] = 0;
281 s->sprite_delta[1][1] = a;
282 ctx->sprite_shift[0] =
283 ctx->sprite_shift[1] = 0;
286 s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + rho)) +
287 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
289 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
290 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
291 s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + rho)) +
292 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
294 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
295 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
296 s->sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
297 (-2 * vop_ref[0][0] + 1) +
298 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
299 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
300 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
301 s->sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
302 (-2 * vop_ref[0][0] + 1) +
303 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
304 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
305 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
306 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
307 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
308 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
309 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
311 ctx->sprite_shift[0] = alpha + rho;
312 ctx->sprite_shift[1] = alpha + rho + 2;
315 min_ab = FFMIN(alpha, beta);
318 s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
319 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
320 h3 * (-vop_ref[0][0]) +
321 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
322 w3 * (-vop_ref[0][1]) +
323 (1 << (alpha + beta + rho - min_ab - 1));
324 s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
325 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
326 h3 * (-vop_ref[0][0]) +
327 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
328 w3 * (-vop_ref[0][1]) +
329 (1 << (alpha + beta + rho - min_ab - 1));
330 s->sprite_offset[1][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
331 h3 * (-2 * vop_ref[0][0] + 1) +
332 (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
333 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
334 r * sprite_ref[0][0] - 16 * w2 * h3 +
335 (1 << (alpha + beta + rho - min_ab + 1));
336 s->sprite_offset[1][1] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
337 h3 * (-2 * vop_ref[0][0] + 1) +
338 (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
339 w3 * (-2 * vop_ref[0][1] + 1) + 2 * w2 * h3 *
340 r * sprite_ref[0][1] - 16 * w2 * h3 +
341 (1 << (alpha + beta + rho - min_ab + 1));
342 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
343 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
344 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
345 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
347 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
348 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
351 /* try to simplify the situation */
352 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
353 s->sprite_delta[0][1] == 0 &&
354 s->sprite_delta[1][0] == 0 &&
355 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
356 s->sprite_offset[0][0] >>= ctx->sprite_shift[0];
357 s->sprite_offset[0][1] >>= ctx->sprite_shift[0];
358 s->sprite_offset[1][0] >>= ctx->sprite_shift[1];
359 s->sprite_offset[1][1] >>= ctx->sprite_shift[1];
360 s->sprite_delta[0][0] = a;
361 s->sprite_delta[0][1] = 0;
362 s->sprite_delta[1][0] = 0;
363 s->sprite_delta[1][1] = a;
364 ctx->sprite_shift[0] = 0;
365 ctx->sprite_shift[1] = 0;
366 s->real_sprite_warping_points = 1;
368 int shift_y = 16 - ctx->sprite_shift[0];
369 int shift_c = 16 - ctx->sprite_shift[1];
371 if (shift_c < 0 || shift_y < 0 ||
372 FFABS(s->sprite_offset[0][0]) >= INT_MAX >> shift_y ||
373 FFABS(s->sprite_offset[1][0]) >= INT_MAX >> shift_c ||
374 FFABS(s->sprite_offset[0][1]) >= INT_MAX >> shift_y ||
375 FFABS(s->sprite_offset[1][1]) >= INT_MAX >> shift_c
377 avpriv_request_sample(s->avctx, "Too large sprite shift or offset");
378 return AVERROR_PATCHWELCOME;
381 for (i = 0; i < 2; i++) {
382 s->sprite_offset[0][i] *= 1 << shift_y;
383 s->sprite_offset[1][i] *= 1 << shift_c;
384 s->sprite_delta[0][i] *= 1 << shift_y;
385 s->sprite_delta[1][i] *= 1 << shift_y;
386 ctx->sprite_shift[i] = 16;
388 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
394 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
395 MpegEncContext *s = &ctx->m;
396 int len = FFMIN(ctx->time_increment_bits + 3, 15);
401 check_marker(s->avctx, gb, "after new_pred");
407 * Decode the next video packet.
408 * @return <0 if something went wrong
410 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
412 MpegEncContext *s = &ctx->m;
414 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
415 int header_extension = 0, mb_num, len;
417 /* is there enough space left for a video packet + header */
418 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
421 for (len = 0; len < 32; len++)
422 if (get_bits1(&s->gb))
425 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
426 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
430 if (ctx->shape != RECT_SHAPE) {
431 header_extension = get_bits1(&s->gb);
432 // FIXME more stuff here
435 mb_num = get_bits(&s->gb, mb_num_bits);
436 if (mb_num >= s->mb_num) {
437 av_log(s->avctx, AV_LOG_ERROR,
438 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
442 s->mb_x = mb_num % s->mb_width;
443 s->mb_y = mb_num / s->mb_width;
445 if (ctx->shape != BIN_ONLY_SHAPE) {
446 int qscale = get_bits(&s->gb, s->quant_precision);
448 s->chroma_qscale = s->qscale = qscale;
451 if (ctx->shape == RECT_SHAPE)
452 header_extension = get_bits1(&s->gb);
454 if (header_extension) {
457 while (get_bits1(&s->gb) != 0)
460 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
461 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
462 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
464 skip_bits(&s->gb, 2); /* vop coding type */
465 // FIXME not rect stuff here
467 if (ctx->shape != BIN_ONLY_SHAPE) {
468 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
469 // FIXME don't just ignore everything
470 if (s->pict_type == AV_PICTURE_TYPE_S &&
471 ctx->vol_sprite_usage == GMC_SPRITE) {
472 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
473 return AVERROR_INVALIDDATA;
474 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
477 // FIXME reduced res stuff here
479 if (s->pict_type != AV_PICTURE_TYPE_I) {
480 int f_code = get_bits(&s->gb, 3); /* fcode_for */
482 av_log(s->avctx, AV_LOG_ERROR,
483 "Error, video packet header damaged (f_code=0)\n");
485 if (s->pict_type == AV_PICTURE_TYPE_B) {
486 int b_code = get_bits(&s->gb, 3);
488 av_log(s->avctx, AV_LOG_ERROR,
489 "Error, video packet header damaged (b_code=0)\n");
494 decode_new_pred(ctx, &s->gb);
500 * Get the average motion vector for a GMC MB.
501 * @param n either 0 for the x component or 1 for y
502 * @return the average MV for a GMC MB
504 static inline int get_amv(Mpeg4DecContext *ctx, int n)
506 MpegEncContext *s = &ctx->m;
507 int x, y, mb_v, sum, dx, dy, shift;
508 int len = 1 << (s->f_code + 4);
509 const int a = s->sprite_warping_accuracy;
511 if (s->workaround_bugs & FF_BUG_AMV)
512 len >>= s->quarter_sample;
514 if (s->real_sprite_warping_points == 1) {
515 if (ctx->divx_version == 500 && ctx->divx_build == 413)
516 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
518 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
520 dx = s->sprite_delta[n][0];
521 dy = s->sprite_delta[n][1];
522 shift = ctx->sprite_shift[0];
524 dy -= 1 << (shift + a + 1);
526 dx -= 1 << (shift + a + 1);
527 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
530 for (y = 0; y < 16; y++) {
535 for (x = 0; x < 16; x++) {
540 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
552 * Decode the dc value.
553 * @param n block index (0-3 are luma, 4-5 are chroma)
554 * @param dir_ptr the prediction direction will be stored here
555 * @return the quantized dc
557 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
562 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
564 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
566 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
567 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
576 level = 2 * get_bits1(&s->gb) - 1;
578 if (get_bits1(&s->gb))
579 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
581 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
584 level = get_xbits(&s->gb, code);
588 if (get_bits1(&s->gb) == 0) { /* marker */
589 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
590 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
597 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
601 * Decode first partition.
602 * @return number of MBs decoded or <0 if an error occurred
604 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
606 MpegEncContext *s = &ctx->m;
608 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
610 /* decode first partition */
611 s->first_slice_line = 1;
612 for (; s->mb_y < s->mb_height; s->mb_y++) {
613 ff_init_block_index(s);
614 for (; s->mb_x < s->mb_width; s->mb_x++) {
615 const int xy = s->mb_x + s->mb_y * s->mb_stride;
620 ff_update_block_index(s);
621 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
622 s->first_slice_line = 0;
624 if (s->pict_type == AV_PICTURE_TYPE_I) {
628 if (show_bits_long(&s->gb, 19) == DC_MARKER)
631 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
633 av_log(s->avctx, AV_LOG_ERROR,
634 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
639 s->cbp_table[xy] = cbpc & 3;
640 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
644 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
646 s->current_picture.qscale_table[xy] = s->qscale;
648 s->mbintra_table[xy] = 1;
649 for (i = 0; i < 6; i++) {
651 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
653 av_log(s->avctx, AV_LOG_ERROR,
654 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
661 s->pred_dir_table[xy] = dir;
662 } else { /* P/S_TYPE */
663 int mx, my, pred_x, pred_y, bits;
664 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
665 const int stride = s->b8_stride * 2;
668 bits = show_bits(&s->gb, 17);
669 if (bits == MOTION_MARKER)
673 if (bits & 0x10000) {
675 if (s->pict_type == AV_PICTURE_TYPE_S &&
676 ctx->vol_sprite_usage == GMC_SPRITE) {
677 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
681 mx = get_amv(ctx, 0);
682 my = get_amv(ctx, 1);
684 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
691 mot_val[0 + stride] =
692 mot_val[2 + stride] = mx;
695 mot_val[1 + stride] =
696 mot_val[3 + stride] = my;
698 if (s->mbintra_table[xy])
699 ff_clean_intra_table_entries(s);
703 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
705 av_log(s->avctx, AV_LOG_ERROR,
706 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
712 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
714 s->mb_intra = ((cbpc & 4) != 0);
717 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
718 s->mbintra_table[xy] = 1;
721 mot_val[0 + stride] =
722 mot_val[2 + stride] = 0;
725 mot_val[1 + stride] =
726 mot_val[3 + stride] = 0;
728 if (s->mbintra_table[xy])
729 ff_clean_intra_table_entries(s);
731 if (s->pict_type == AV_PICTURE_TYPE_S &&
732 ctx->vol_sprite_usage == GMC_SPRITE &&
734 s->mcsel = get_bits1(&s->gb);
738 if ((cbpc & 16) == 0) {
739 /* 16x16 motion prediction */
741 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
743 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
747 my = ff_h263_decode_motion(s, pred_y, s->f_code);
750 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
753 mx = get_amv(ctx, 0);
754 my = get_amv(ctx, 1);
755 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
762 mot_val[0 + stride] =
763 mot_val[2 + stride] = mx;
766 mot_val[1 + stride] =
767 mot_val[3 + stride] = my;
770 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
772 for (i = 0; i < 4; i++) {
773 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
774 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
778 my = ff_h263_decode_motion(s, pred_y, s->f_code);
795 * decode second partition.
796 * @return <0 if an error occurred
798 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
801 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
803 s->mb_x = s->resync_mb_x;
804 s->first_slice_line = 1;
805 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
806 ff_init_block_index(s);
807 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
808 const int xy = s->mb_x + s->mb_y * s->mb_stride;
811 ff_update_block_index(s);
812 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
813 s->first_slice_line = 0;
815 if (s->pict_type == AV_PICTURE_TYPE_I) {
816 int ac_pred = get_bits1(&s->gb);
817 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
819 av_log(s->avctx, AV_LOG_ERROR,
820 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
824 s->cbp_table[xy] |= cbpy << 2;
825 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
826 } else { /* P || S_TYPE */
827 if (IS_INTRA(s->current_picture.mb_type[xy])) {
830 int ac_pred = get_bits1(&s->gb);
831 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
834 av_log(s->avctx, AV_LOG_ERROR,
835 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
839 if (s->cbp_table[xy] & 8)
840 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
841 s->current_picture.qscale_table[xy] = s->qscale;
843 for (i = 0; i < 6; i++) {
845 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
847 av_log(s->avctx, AV_LOG_ERROR,
848 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
855 s->cbp_table[xy] &= 3; // remove dquant
856 s->cbp_table[xy] |= cbpy << 2;
857 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
858 s->pred_dir_table[xy] = dir;
859 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
860 s->current_picture.qscale_table[xy] = s->qscale;
861 s->cbp_table[xy] = 0;
863 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
866 av_log(s->avctx, AV_LOG_ERROR,
867 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
871 if (s->cbp_table[xy] & 8)
872 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
873 s->current_picture.qscale_table[xy] = s->qscale;
875 s->cbp_table[xy] &= 3; // remove dquant
876 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
880 if (mb_num >= mb_count)
888 * Decode the first and second partition.
889 * @return <0 if error (and sets error type in the error_status_table)
891 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
893 MpegEncContext *s = &ctx->m;
895 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
896 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
898 mb_num = mpeg4_decode_partition_a(ctx);
900 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
901 s->mb_x, s->mb_y, part_a_error);
905 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
906 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
907 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
908 s->mb_x, s->mb_y, part_a_error);
912 s->mb_num_left = mb_num;
914 if (s->pict_type == AV_PICTURE_TYPE_I) {
915 while (show_bits(&s->gb, 9) == 1)
916 skip_bits(&s->gb, 9);
917 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
918 av_log(s->avctx, AV_LOG_ERROR,
919 "marker missing after first I partition at %d %d\n",
924 while (show_bits(&s->gb, 10) == 1)
925 skip_bits(&s->gb, 10);
926 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
927 av_log(s->avctx, AV_LOG_ERROR,
928 "marker missing after first P partition at %d %d\n",
933 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
934 s->mb_x - 1, s->mb_y, part_a_end);
936 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
937 if (s->pict_type == AV_PICTURE_TYPE_P)
938 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
939 s->mb_x, s->mb_y, ER_DC_ERROR);
942 if (s->pict_type == AV_PICTURE_TYPE_P)
943 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
944 s->mb_x - 1, s->mb_y, ER_DC_END);
952 * @return <0 if an error occurred
954 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
955 int n, int coded, int intra, int rvlc)
957 MpegEncContext *s = &ctx->m;
958 int level, i, last, run, qmul, qadd;
959 int av_uninit(dc_pred_dir);
962 const uint8_t *scan_table;
964 // Note intra & rvlc should be optimized away if this is inlined
967 if (ctx->use_intra_dc_vlc) {
969 if (s->partitioned_frame) {
970 level = s->dc_val[0][s->block_index[n]];
972 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
974 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
975 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
977 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
985 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
991 rl = &ff_rvlc_rl_intra;
992 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
994 rl = &ff_mpeg4_rl_intra;
995 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
998 if (dc_pred_dir == 0)
999 scan_table = s->intra_v_scantable.permutated; /* left */
1001 scan_table = s->intra_h_scantable.permutated; /* top */
1003 scan_table = s->intra_scantable.permutated;
1010 s->block_last_index[n] = i;
1014 rl = &ff_rvlc_rl_inter;
1016 rl = &ff_h263_rl_inter;
1018 scan_table = s->intra_scantable.permutated;
1020 if (s->mpeg_quant) {
1024 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1026 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1028 qmul = s->qscale << 1;
1029 qadd = (s->qscale - 1) | 1;
1031 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1033 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1037 OPEN_READER(re, &s->gb);
1039 UPDATE_CACHE(re, &s->gb);
1040 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1044 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1045 av_log(s->avctx, AV_LOG_ERROR,
1046 "1. marker bit missing in rvlc esc\n");
1049 SKIP_CACHE(re, &s->gb, 1);
1051 last = SHOW_UBITS(re, &s->gb, 1);
1052 SKIP_CACHE(re, &s->gb, 1);
1053 run = SHOW_UBITS(re, &s->gb, 6);
1054 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1055 UPDATE_CACHE(re, &s->gb);
1057 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1058 av_log(s->avctx, AV_LOG_ERROR,
1059 "2. marker bit missing in rvlc esc\n");
1062 SKIP_CACHE(re, &s->gb, 1);
1064 level = SHOW_UBITS(re, &s->gb, 11);
1065 SKIP_CACHE(re, &s->gb, 11);
1067 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1068 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1071 SKIP_CACHE(re, &s->gb, 5);
1073 level = level * qmul + qadd;
1074 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1075 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1082 cache = GET_CACHE(re, &s->gb);
1085 cache ^= 0xC0000000;
1087 if (cache & 0x80000000) {
1088 if (cache & 0x40000000) {
1090 SKIP_CACHE(re, &s->gb, 2);
1091 last = SHOW_UBITS(re, &s->gb, 1);
1092 SKIP_CACHE(re, &s->gb, 1);
1093 run = SHOW_UBITS(re, &s->gb, 6);
1094 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1095 UPDATE_CACHE(re, &s->gb);
1098 level = SHOW_SBITS(re, &s->gb, 12);
1099 LAST_SKIP_BITS(re, &s->gb, 12);
1101 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1102 av_log(s->avctx, AV_LOG_ERROR,
1103 "1. marker bit missing in 3. esc\n");
1104 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1107 SKIP_CACHE(re, &s->gb, 1);
1109 level = SHOW_SBITS(re, &s->gb, 12);
1110 SKIP_CACHE(re, &s->gb, 12);
1112 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1113 av_log(s->avctx, AV_LOG_ERROR,
1114 "2. marker bit missing in 3. esc\n");
1115 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1119 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1123 if (s->error_recognition >= FF_ER_COMPLIANT) {
1124 const int abs_level= FFABS(level);
1125 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1126 const int run1= run - rl->max_run[last][abs_level] - 1;
1127 if (abs_level <= rl->max_level[last][run]) {
1128 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1131 if (s->error_recognition > FF_ER_COMPLIANT) {
1132 if (abs_level <= rl->max_level[last][run]*2) {
1133 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1136 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1137 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1145 level = level * qmul + qadd;
1147 level = level * qmul - qadd;
1149 if ((unsigned)(level + 2048) > 4095) {
1150 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1151 if (level > 2560 || level < -2560) {
1152 av_log(s->avctx, AV_LOG_ERROR,
1153 "|level| overflow in 3. esc, qp=%d\n",
1158 level = level < 0 ? -2048 : 2047;
1166 SKIP_BITS(re, &s->gb, 2);
1167 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1168 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1169 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1170 LAST_SKIP_BITS(re, &s->gb, 1);
1174 SKIP_BITS(re, &s->gb, 1);
1175 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1177 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1178 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1179 LAST_SKIP_BITS(re, &s->gb, 1);
1184 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1185 LAST_SKIP_BITS(re, &s->gb, 1);
1187 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1191 av_log(s->avctx, AV_LOG_ERROR,
1192 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1196 block[scan_table[i]] = level;
1200 block[scan_table[i]] = level;
1202 CLOSE_READER(re, &s->gb);
1207 if (!ctx->use_intra_dc_vlc) {
1208 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1210 i -= i >> 31; // if (i == -1) i = 0;
1213 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1215 i = 63; // FIXME not optimal
1217 s->block_last_index[n] = i;
1222 * decode partition C of one MB.
1223 * @return <0 if an error occurred
1225 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1227 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1229 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1231 mb_type = s->current_picture.mb_type[xy];
1232 cbp = s->cbp_table[xy];
1234 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1236 if (s->current_picture.qscale_table[xy] != s->qscale)
1237 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1239 if (s->pict_type == AV_PICTURE_TYPE_P ||
1240 s->pict_type == AV_PICTURE_TYPE_S) {
1242 for (i = 0; i < 4; i++) {
1243 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1244 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1246 s->mb_intra = IS_INTRA(mb_type);
1248 if (IS_SKIP(mb_type)) {
1250 for (i = 0; i < 6; i++)
1251 s->block_last_index[i] = -1;
1252 s->mv_dir = MV_DIR_FORWARD;
1253 s->mv_type = MV_TYPE_16X16;
1254 if (s->pict_type == AV_PICTURE_TYPE_S
1255 && ctx->vol_sprite_usage == GMC_SPRITE) {
1262 } else if (s->mb_intra) {
1263 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1264 } else if (!s->mb_intra) {
1265 // s->mcsel = 0; // FIXME do we need to init that?
1267 s->mv_dir = MV_DIR_FORWARD;
1268 if (IS_8X8(mb_type)) {
1269 s->mv_type = MV_TYPE_8X8;
1271 s->mv_type = MV_TYPE_16X16;
1274 } else { /* I-Frame */
1276 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1279 if (!IS_SKIP(mb_type)) {
1281 s->bdsp.clear_blocks(s->block[0]);
1282 /* decode each block */
1283 for (i = 0; i < 6; i++) {
1284 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1285 av_log(s->avctx, AV_LOG_ERROR,
1286 "texture corrupted at %d %d %d\n",
1287 s->mb_x, s->mb_y, s->mb_intra);
1294 /* per-MB end of slice check */
1295 if (--s->mb_num_left <= 0) {
1296 if (mpeg4_is_resync(ctx))
1301 if (mpeg4_is_resync(ctx)) {
1302 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1303 if (s->cbp_table[xy + delta])
1310 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1312 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1313 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1315 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1316 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1318 av_assert2(s->h263_pred);
1320 if (s->pict_type == AV_PICTURE_TYPE_P ||
1321 s->pict_type == AV_PICTURE_TYPE_S) {
1323 if (get_bits1(&s->gb)) {
1326 for (i = 0; i < 6; i++)
1327 s->block_last_index[i] = -1;
1328 s->mv_dir = MV_DIR_FORWARD;
1329 s->mv_type = MV_TYPE_16X16;
1330 if (s->pict_type == AV_PICTURE_TYPE_S &&
1331 ctx->vol_sprite_usage == GMC_SPRITE) {
1332 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1337 s->mv[0][0][0] = get_amv(ctx, 0);
1338 s->mv[0][0][1] = get_amv(ctx, 1);
1341 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1351 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1353 av_log(s->avctx, AV_LOG_ERROR,
1354 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1357 } while (cbpc == 20);
1359 s->bdsp.clear_blocks(s->block[0]);
1361 s->mb_intra = ((cbpc & 4) != 0);
1365 if (s->pict_type == AV_PICTURE_TYPE_S &&
1366 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1367 s->mcsel = get_bits1(&s->gb);
1370 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1372 av_log(s->avctx, AV_LOG_ERROR,
1373 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1374 return AVERROR_INVALIDDATA;
1377 cbp = (cbpc & 3) | (cbpy << 2);
1379 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1380 if ((!s->progressive_sequence) &&
1381 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1382 s->interlaced_dct = get_bits1(&s->gb);
1384 s->mv_dir = MV_DIR_FORWARD;
1385 if ((cbpc & 16) == 0) {
1387 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1390 /* 16x16 global motion prediction */
1391 s->mv_type = MV_TYPE_16X16;
1392 mx = get_amv(ctx, 0);
1393 my = get_amv(ctx, 1);
1394 s->mv[0][0][0] = mx;
1395 s->mv[0][0][1] = my;
1396 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1397 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1400 /* 16x8 field motion prediction */
1401 s->mv_type = MV_TYPE_FIELD;
1403 s->field_select[0][0] = get_bits1(&s->gb);
1404 s->field_select[0][1] = get_bits1(&s->gb);
1406 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1408 for (i = 0; i < 2; i++) {
1409 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1413 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1417 s->mv[0][i][0] = mx;
1418 s->mv[0][i][1] = my;
1421 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1422 /* 16x16 motion prediction */
1423 s->mv_type = MV_TYPE_16X16;
1424 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1425 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1430 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1434 s->mv[0][0][0] = mx;
1435 s->mv[0][0][1] = my;
1438 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1439 s->mv_type = MV_TYPE_8X8;
1440 for (i = 0; i < 4; i++) {
1441 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1442 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1446 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1449 s->mv[0][i][0] = mx;
1450 s->mv[0][i][1] = my;
1455 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1456 int modb1; // first bit of modb
1457 int modb2; // second bit of modb
1460 s->mb_intra = 0; // B-frames never contain intra blocks
1461 s->mcsel = 0; // ... true gmc blocks
1464 for (i = 0; i < 2; i++) {
1465 s->last_mv[i][0][0] =
1466 s->last_mv[i][0][1] =
1467 s->last_mv[i][1][0] =
1468 s->last_mv[i][1][1] = 0;
1471 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1474 /* if we skipped it in the future P-frame than skip it now too */
1475 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1477 if (s->mb_skipped) {
1479 for (i = 0; i < 6; i++)
1480 s->block_last_index[i] = -1;
1482 s->mv_dir = MV_DIR_FORWARD;
1483 s->mv_type = MV_TYPE_16X16;
1488 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1494 modb1 = get_bits1(&s->gb);
1496 // like MB_TYPE_B_DIRECT but no vectors coded
1497 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1500 modb2 = get_bits1(&s->gb);
1501 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1503 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1506 mb_type = mb_type_b_map[mb_type];
1510 s->bdsp.clear_blocks(s->block[0]);
1511 cbp = get_bits(&s->gb, 6);
1514 if ((!IS_DIRECT(mb_type)) && cbp) {
1515 if (get_bits1(&s->gb))
1516 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1519 if (!s->progressive_sequence) {
1521 s->interlaced_dct = get_bits1(&s->gb);
1523 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1524 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1525 mb_type &= ~MB_TYPE_16x16;
1527 if (USES_LIST(mb_type, 0)) {
1528 s->field_select[0][0] = get_bits1(&s->gb);
1529 s->field_select[0][1] = get_bits1(&s->gb);
1531 if (USES_LIST(mb_type, 1)) {
1532 s->field_select[1][0] = get_bits1(&s->gb);
1533 s->field_select[1][1] = get_bits1(&s->gb);
1539 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1540 s->mv_type = MV_TYPE_16X16;
1542 if (USES_LIST(mb_type, 0)) {
1543 s->mv_dir = MV_DIR_FORWARD;
1545 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1546 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1547 s->last_mv[0][1][0] =
1548 s->last_mv[0][0][0] =
1549 s->mv[0][0][0] = mx;
1550 s->last_mv[0][1][1] =
1551 s->last_mv[0][0][1] =
1552 s->mv[0][0][1] = my;
1555 if (USES_LIST(mb_type, 1)) {
1556 s->mv_dir |= MV_DIR_BACKWARD;
1558 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1559 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1560 s->last_mv[1][1][0] =
1561 s->last_mv[1][0][0] =
1562 s->mv[1][0][0] = mx;
1563 s->last_mv[1][1][1] =
1564 s->last_mv[1][0][1] =
1565 s->mv[1][0][1] = my;
1567 } else if (!IS_DIRECT(mb_type)) {
1568 s->mv_type = MV_TYPE_FIELD;
1570 if (USES_LIST(mb_type, 0)) {
1571 s->mv_dir = MV_DIR_FORWARD;
1573 for (i = 0; i < 2; i++) {
1574 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1575 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1576 s->last_mv[0][i][0] =
1577 s->mv[0][i][0] = mx;
1578 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1582 if (USES_LIST(mb_type, 1)) {
1583 s->mv_dir |= MV_DIR_BACKWARD;
1585 for (i = 0; i < 2; i++) {
1586 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1587 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1588 s->last_mv[1][i][0] =
1589 s->mv[1][i][0] = mx;
1590 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1596 if (IS_DIRECT(mb_type)) {
1597 if (IS_SKIP(mb_type)) {
1601 mx = ff_h263_decode_motion(s, 0, 1);
1602 my = ff_h263_decode_motion(s, 0, 1);
1605 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1606 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1608 s->current_picture.mb_type[xy] = mb_type;
1609 } else { /* I-Frame */
1611 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1613 av_log(s->avctx, AV_LOG_ERROR,
1614 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1617 } while (cbpc == 8);
1623 s->ac_pred = get_bits1(&s->gb);
1625 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1627 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1629 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1631 av_log(s->avctx, AV_LOG_ERROR,
1632 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1635 cbp = (cbpc & 3) | (cbpy << 2);
1637 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1640 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1642 if (!s->progressive_sequence)
1643 s->interlaced_dct = get_bits1(&s->gb);
1645 s->bdsp.clear_blocks(s->block[0]);
1646 /* decode each block */
1647 for (i = 0; i < 6; i++) {
1648 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1655 /* decode each block */
1656 for (i = 0; i < 6; i++) {
1657 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1663 /* per-MB end of slice check */
1664 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1665 int next = mpeg4_is_resync(ctx);
1667 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1669 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1672 if (s->pict_type == AV_PICTURE_TYPE_B) {
1673 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1674 ff_thread_await_progress(&s->next_picture_ptr->tf,
1675 (s->mb_x + delta >= s->mb_width)
1676 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1678 if (s->next_picture.mbskip_table[xy + delta])
1689 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1691 int hours, minutes, seconds;
1693 if (!show_bits(gb, 23)) {
1694 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1698 hours = get_bits(gb, 5);
1699 minutes = get_bits(gb, 6);
1700 check_marker(s->avctx, gb, "in gop_header");
1701 seconds = get_bits(gb, 6);
1703 s->time_base = seconds + 60*(minutes + 60*hours);
1711 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1714 s->avctx->profile = get_bits(gb, 4);
1715 s->avctx->level = get_bits(gb, 4);
1717 // for Simple profile, level 0
1718 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1719 s->avctx->level = 0;
1725 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1727 MpegEncContext *s = &ctx->m;
1728 int width, height, vo_ver_id;
1731 skip_bits(gb, 1); /* random access */
1732 s->vo_type = get_bits(gb, 8);
1733 if (get_bits1(gb) != 0) { /* is_ol_id */
1734 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1735 skip_bits(gb, 3); /* vo_priority */
1739 s->aspect_ratio_info = get_bits(gb, 4);
1740 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1741 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1742 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1744 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1747 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1748 int chroma_format = get_bits(gb, 2);
1749 if (chroma_format != CHROMA_420)
1750 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1752 s->low_delay = get_bits1(gb);
1753 if (get_bits1(gb)) { /* vbv parameters */
1754 get_bits(gb, 15); /* first_half_bitrate */
1755 check_marker(s->avctx, gb, "after first_half_bitrate");
1756 get_bits(gb, 15); /* latter_half_bitrate */
1757 check_marker(s->avctx, gb, "after latter_half_bitrate");
1758 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1759 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1760 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1761 get_bits(gb, 11); /* first_half_vbv_occupancy */
1762 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1763 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1764 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1767 /* is setting low delay flag only once the smartest thing to do?
1768 * low delay detection will not be overridden. */
1769 if (s->picture_number == 0) {
1770 switch(s->vo_type) {
1771 case SIMPLE_VO_TYPE:
1772 case ADV_SIMPLE_VO_TYPE:
1781 ctx->shape = get_bits(gb, 2); /* vol shape */
1782 if (ctx->shape != RECT_SHAPE)
1783 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1784 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1785 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1786 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1789 check_marker(s->avctx, gb, "before time_increment_resolution");
1791 s->avctx->framerate.num = get_bits(gb, 16);
1792 if (!s->avctx->framerate.num) {
1793 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1794 return AVERROR_INVALIDDATA;
1797 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1798 if (ctx->time_increment_bits < 1)
1799 ctx->time_increment_bits = 1;
1801 check_marker(s->avctx, gb, "before fixed_vop_rate");
1803 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1804 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1806 s->avctx->framerate.den = 1;
1808 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1812 if (ctx->shape != BIN_ONLY_SHAPE) {
1813 if (ctx->shape == RECT_SHAPE) {
1814 check_marker(s->avctx, gb, "before width");
1815 width = get_bits(gb, 13);
1816 check_marker(s->avctx, gb, "before height");
1817 height = get_bits(gb, 13);
1818 check_marker(s->avctx, gb, "after height");
1819 if (width && height && /* they should be non zero but who knows */
1820 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1821 if (s->width && s->height &&
1822 (s->width != width || s->height != height))
1823 s->context_reinit = 1;
1829 s->progressive_sequence =
1830 s->progressive_frame = get_bits1(gb) ^ 1;
1831 s->interlaced_dct = 0;
1832 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1833 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1834 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1836 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1838 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1840 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1841 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1842 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1843 ctx->vol_sprite_usage == GMC_SPRITE) {
1844 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1845 skip_bits(gb, 13); // sprite_width
1846 check_marker(s->avctx, gb, "after sprite_width");
1847 skip_bits(gb, 13); // sprite_height
1848 check_marker(s->avctx, gb, "after sprite_height");
1849 skip_bits(gb, 13); // sprite_left
1850 check_marker(s->avctx, gb, "after sprite_left");
1851 skip_bits(gb, 13); // sprite_top
1852 check_marker(s->avctx, gb, "after sprite_top");
1854 ctx->num_sprite_warping_points = get_bits(gb, 6);
1855 if (ctx->num_sprite_warping_points > 3) {
1856 av_log(s->avctx, AV_LOG_ERROR,
1857 "%d sprite_warping_points\n",
1858 ctx->num_sprite_warping_points);
1859 ctx->num_sprite_warping_points = 0;
1860 return AVERROR_INVALIDDATA;
1862 s->sprite_warping_accuracy = get_bits(gb, 2);
1863 ctx->sprite_brightness_change = get_bits1(gb);
1864 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1865 skip_bits1(gb); // low_latency_sprite
1867 // FIXME sadct disable bit if verid!=1 && shape not rect
1869 if (get_bits1(gb) == 1) { /* not_8_bit */
1870 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1871 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1872 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1873 if (s->quant_precision != 5)
1874 av_log(s->avctx, AV_LOG_ERROR,
1875 "quant precision %d\n", s->quant_precision);
1876 if (s->quant_precision<3 || s->quant_precision>9) {
1877 s->quant_precision = 5;
1880 s->quant_precision = 5;
1883 // FIXME a bunch of grayscale shape things
1885 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1888 /* load default matrixes */
1889 for (i = 0; i < 64; i++) {
1890 int j = s->idsp.idct_permutation[i];
1891 v = ff_mpeg4_default_intra_matrix[i];
1892 s->intra_matrix[j] = v;
1893 s->chroma_intra_matrix[j] = v;
1895 v = ff_mpeg4_default_non_intra_matrix[i];
1896 s->inter_matrix[j] = v;
1897 s->chroma_inter_matrix[j] = v;
1900 /* load custom intra matrix */
1901 if (get_bits1(gb)) {
1903 for (i = 0; i < 64; i++) {
1905 if (get_bits_left(gb) < 8) {
1906 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1907 return AVERROR_INVALIDDATA;
1909 v = get_bits(gb, 8);
1914 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1915 s->intra_matrix[j] = last;
1916 s->chroma_intra_matrix[j] = last;
1919 /* replicate last value */
1920 for (; i < 64; i++) {
1921 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1922 s->intra_matrix[j] = last;
1923 s->chroma_intra_matrix[j] = last;
1927 /* load custom non intra matrix */
1928 if (get_bits1(gb)) {
1930 for (i = 0; i < 64; i++) {
1932 if (get_bits_left(gb) < 8) {
1933 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1934 return AVERROR_INVALIDDATA;
1936 v = get_bits(gb, 8);
1941 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1942 s->inter_matrix[j] = v;
1943 s->chroma_inter_matrix[j] = v;
1946 /* replicate last value */
1947 for (; i < 64; i++) {
1948 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1949 s->inter_matrix[j] = last;
1950 s->chroma_inter_matrix[j] = last;
1954 // FIXME a bunch of grayscale shape things
1958 s->quarter_sample = get_bits1(gb);
1960 s->quarter_sample = 0;
1962 if (get_bits_left(gb) < 4) {
1963 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1964 return AVERROR_INVALIDDATA;
1967 if (!get_bits1(gb)) {
1968 int pos = get_bits_count(gb);
1969 int estimation_method = get_bits(gb, 2);
1970 if (estimation_method < 2) {
1971 if (!get_bits1(gb)) {
1972 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1973 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1974 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1975 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
1976 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
1977 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
1979 if (!get_bits1(gb)) {
1980 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
1981 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
1982 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
1983 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
1985 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
1986 skip_bits_long(gb, pos - get_bits_count(gb));
1989 if (!get_bits1(gb)) {
1990 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
1991 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
1992 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
1993 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
1995 if (!get_bits1(gb)) {
1996 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
1997 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
1998 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
1999 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2000 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2001 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2003 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2004 skip_bits_long(gb, pos - get_bits_count(gb));
2007 if (estimation_method == 1) {
2008 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2009 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2012 av_log(s->avctx, AV_LOG_ERROR,
2013 "Invalid Complexity estimation method %d\n",
2018 ctx->cplx_estimation_trash_i =
2019 ctx->cplx_estimation_trash_p =
2020 ctx->cplx_estimation_trash_b = 0;
2023 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2025 s->data_partitioning = get_bits1(gb);
2026 if (s->data_partitioning)
2027 ctx->rvlc = get_bits1(gb);
2029 if (vo_ver_id != 1) {
2030 ctx->new_pred = get_bits1(gb);
2031 if (ctx->new_pred) {
2032 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2033 skip_bits(gb, 2); /* requested upstream message type */
2034 skip_bits1(gb); /* newpred segment type */
2036 if (get_bits1(gb)) // reduced_res_vop
2037 av_log(s->avctx, AV_LOG_ERROR,
2038 "reduced resolution VOP not supported\n");
2043 ctx->scalability = get_bits1(gb);
2045 if (ctx->scalability) {
2046 GetBitContext bak = *gb;
2047 int h_sampling_factor_n;
2048 int h_sampling_factor_m;
2049 int v_sampling_factor_n;
2050 int v_sampling_factor_m;
2052 skip_bits1(gb); // hierarchy_type
2053 skip_bits(gb, 4); /* ref_layer_id */
2054 skip_bits1(gb); /* ref_layer_sampling_dir */
2055 h_sampling_factor_n = get_bits(gb, 5);
2056 h_sampling_factor_m = get_bits(gb, 5);
2057 v_sampling_factor_n = get_bits(gb, 5);
2058 v_sampling_factor_m = get_bits(gb, 5);
2059 ctx->enhancement_type = get_bits1(gb);
2061 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2062 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2063 /* illegal scalability header (VERY broken encoder),
2064 * trying to workaround */
2065 ctx->scalability = 0;
2068 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2070 // bin shape stuff FIXME
2074 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2075 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",
2076 s->avctx->framerate.den, s->avctx->framerate.num,
2077 ctx->time_increment_bits,
2079 s->progressive_sequence,
2081 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2082 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2090 * Decode the user data stuff in the header.
2091 * Also initializes divx/xvid/lavc_version/build.
2093 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2095 MpegEncContext *s = &ctx->m;
2099 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2102 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2103 if (show_bits(gb, 23) == 0)
2105 buf[i] = get_bits(gb, 8);
2109 /* divx detection */
2110 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2112 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2114 ctx->divx_version = ver;
2115 ctx->divx_build = build;
2116 s->divx_packed = e == 3 && last == 'p';
2119 /* libavcodec detection */
2120 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2122 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2124 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2126 build = (ver << 16) + (ver2 << 8) + ver3;
2129 if (strcmp(buf, "ffmpeg") == 0)
2130 ctx->lavc_build = 4600;
2133 ctx->lavc_build = build;
2135 /* Xvid detection */
2136 e = sscanf(buf, "XviD%d", &build);
2138 ctx->xvid_build = build;
2143 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2145 Mpeg4DecContext *ctx = avctx->priv_data;
2146 MpegEncContext *s = &ctx->m;
2148 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2149 if (s->codec_tag == AV_RL32("XVID") ||
2150 s->codec_tag == AV_RL32("XVIX") ||
2151 s->codec_tag == AV_RL32("RMP4") ||
2152 s->codec_tag == AV_RL32("ZMP4") ||
2153 s->codec_tag == AV_RL32("SIPP"))
2154 ctx->xvid_build = 0;
2157 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2158 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2159 ctx->vol_control_parameters == 0)
2160 ctx->divx_version = 400; // divx 4
2162 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2164 ctx->divx_build = -1;
2167 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2168 if (s->codec_tag == AV_RL32("XVIX"))
2169 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2171 if (s->codec_tag == AV_RL32("UMP4"))
2172 s->workaround_bugs |= FF_BUG_UMP4;
2174 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2175 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2177 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2178 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2180 if (ctx->xvid_build <= 3U)
2181 s->padding_bug_score = 256 * 256 * 256 * 64;
2183 if (ctx->xvid_build <= 1U)
2184 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2186 if (ctx->xvid_build <= 12U)
2187 s->workaround_bugs |= FF_BUG_EDGE;
2189 if (ctx->xvid_build <= 32U)
2190 s->workaround_bugs |= FF_BUG_DC_CLIP;
2192 #define SET_QPEL_FUNC(postfix1, postfix2) \
2193 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2194 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2195 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2197 if (ctx->lavc_build < 4653U)
2198 s->workaround_bugs |= FF_BUG_STD_QPEL;
2200 if (ctx->lavc_build < 4655U)
2201 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2203 if (ctx->lavc_build < 4670U)
2204 s->workaround_bugs |= FF_BUG_EDGE;
2206 if (ctx->lavc_build <= 4712U)
2207 s->workaround_bugs |= FF_BUG_DC_CLIP;
2209 if ((ctx->lavc_build&0xFF) >= 100) {
2210 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2211 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2213 s->workaround_bugs |= FF_BUG_IEDGE;
2216 if (ctx->divx_version >= 0)
2217 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2218 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2219 s->padding_bug_score = 256 * 256 * 256 * 64;
2221 if (ctx->divx_version < 500U)
2222 s->workaround_bugs |= FF_BUG_EDGE;
2224 if (ctx->divx_version >= 0)
2225 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2228 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2229 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2230 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2231 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2232 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2233 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2234 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2236 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2237 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2238 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2239 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2240 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2241 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2244 if (avctx->debug & FF_DEBUG_BUGS)
2245 av_log(s->avctx, AV_LOG_DEBUG,
2246 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2247 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2248 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2250 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2251 s->codec_id == AV_CODEC_ID_MPEG4 &&
2252 avctx->idct_algo == FF_IDCT_AUTO) {
2253 avctx->idct_algo = FF_IDCT_XVID;
2254 ff_mpv_idct_init(s);
2261 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2263 MpegEncContext *s = &ctx->m;
2264 int time_incr, time_increment;
2267 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2268 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2269 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2270 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2274 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2275 if (s->partitioned_frame)
2276 s->decode_mb = mpeg4_decode_partitioned_mb;
2278 s->decode_mb = mpeg4_decode_mb;
2281 while (get_bits1(gb) != 0)
2284 check_marker(s->avctx, gb, "before time_increment");
2286 if (ctx->time_increment_bits == 0 ||
2287 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2288 av_log(s->avctx, AV_LOG_WARNING,
2289 "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);
2291 for (ctx->time_increment_bits = 1;
2292 ctx->time_increment_bits < 16;
2293 ctx->time_increment_bits++) {
2294 if (s->pict_type == AV_PICTURE_TYPE_P ||
2295 (s->pict_type == AV_PICTURE_TYPE_S &&
2296 ctx->vol_sprite_usage == GMC_SPRITE)) {
2297 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2299 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2303 av_log(s->avctx, AV_LOG_WARNING,
2304 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2305 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2306 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2307 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2312 time_increment = get_bits1(gb); // FIXME investigate further
2314 time_increment = get_bits(gb, ctx->time_increment_bits);
2316 if (s->pict_type != AV_PICTURE_TYPE_B) {
2317 s->last_time_base = s->time_base;
2318 s->time_base += time_incr;
2319 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2320 if (s->workaround_bugs & FF_BUG_UMP4) {
2321 if (s->time < s->last_non_b_time) {
2322 /* header is not mpeg-4-compatible, broken encoder,
2323 * trying to workaround */
2325 s->time += s->avctx->framerate.num;
2328 s->pp_time = s->time - s->last_non_b_time;
2329 s->last_non_b_time = s->time;
2331 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2332 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2333 if (s->pp_time <= s->pb_time ||
2334 s->pp_time <= s->pp_time - s->pb_time ||
2336 /* messed up order, maybe after seeking? skipping current B-frame */
2337 return FRAME_SKIPPED;
2339 ff_mpeg4_init_direct_mv(s);
2341 if (ctx->t_frame == 0)
2342 ctx->t_frame = s->pb_time;
2343 if (ctx->t_frame == 0)
2344 ctx->t_frame = 1; // 1/0 protection
2345 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2346 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2347 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2348 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2349 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2350 s->pb_field_time = 2;
2351 s->pp_field_time = 4;
2352 if (!s->progressive_sequence)
2353 return FRAME_SKIPPED;
2357 if (s->avctx->framerate.den)
2358 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2360 pts = AV_NOPTS_VALUE;
2361 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2363 check_marker(s->avctx, gb, "before vop_coded");
2366 if (get_bits1(gb) != 1) {
2367 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2368 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2369 return FRAME_SKIPPED;
2372 decode_new_pred(ctx, gb);
2374 if (ctx->shape != BIN_ONLY_SHAPE &&
2375 (s->pict_type == AV_PICTURE_TYPE_P ||
2376 (s->pict_type == AV_PICTURE_TYPE_S &&
2377 ctx->vol_sprite_usage == GMC_SPRITE))) {
2378 /* rounding type for motion estimation */
2379 s->no_rounding = get_bits1(gb);
2383 // FIXME reduced res stuff
2385 if (ctx->shape != RECT_SHAPE) {
2386 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2387 skip_bits(gb, 13); /* width */
2388 check_marker(s->avctx, gb, "after width");
2389 skip_bits(gb, 13); /* height */
2390 check_marker(s->avctx, gb, "after height");
2391 skip_bits(gb, 13); /* hor_spat_ref */
2392 check_marker(s->avctx, gb, "after hor_spat_ref");
2393 skip_bits(gb, 13); /* ver_spat_ref */
2395 skip_bits1(gb); /* change_CR_disable */
2397 if (get_bits1(gb) != 0)
2398 skip_bits(gb, 8); /* constant_alpha_value */
2401 // FIXME complexity estimation stuff
2403 if (ctx->shape != BIN_ONLY_SHAPE) {
2404 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2405 if (s->pict_type != AV_PICTURE_TYPE_I)
2406 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2407 if (s->pict_type == AV_PICTURE_TYPE_B)
2408 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2410 if (get_bits_left(gb) < 3) {
2411 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2412 return AVERROR_INVALIDDATA;
2414 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2415 if (!s->progressive_sequence) {
2416 s->top_field_first = get_bits1(gb);
2417 s->alternate_scan = get_bits1(gb);
2419 s->alternate_scan = 0;
2422 if (s->alternate_scan) {
2423 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2424 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2425 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2426 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2428 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2429 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2430 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2431 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2434 if (s->pict_type == AV_PICTURE_TYPE_S &&
2435 (ctx->vol_sprite_usage == STATIC_SPRITE ||
2436 ctx->vol_sprite_usage == GMC_SPRITE)) {
2437 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2438 return AVERROR_INVALIDDATA;
2439 if (ctx->sprite_brightness_change)
2440 av_log(s->avctx, AV_LOG_ERROR,
2441 "sprite_brightness_change not supported\n");
2442 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2443 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2446 if (ctx->shape != BIN_ONLY_SHAPE) {
2447 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2448 if (s->qscale == 0) {
2449 av_log(s->avctx, AV_LOG_ERROR,
2450 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2451 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2454 if (s->pict_type != AV_PICTURE_TYPE_I) {
2455 s->f_code = get_bits(gb, 3); /* fcode_for */
2456 if (s->f_code == 0) {
2457 av_log(s->avctx, AV_LOG_ERROR,
2458 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2460 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2465 if (s->pict_type == AV_PICTURE_TYPE_B) {
2466 s->b_code = get_bits(gb, 3);
2467 if (s->b_code == 0) {
2468 av_log(s->avctx, AV_LOG_ERROR,
2469 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2471 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2476 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2477 av_log(s->avctx, AV_LOG_DEBUG,
2478 "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",
2479 s->qscale, s->f_code, s->b_code,
2480 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")),
2481 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2482 s->top_field_first, s->quarter_sample ? "q" : "h",
2483 s->data_partitioning, ctx->resync_marker,
2484 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2485 1 - s->no_rounding, s->vo_type,
2486 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2487 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2488 ctx->cplx_estimation_trash_b,
2494 if (!ctx->scalability) {
2495 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2496 skip_bits1(gb); // vop shape coding type
2498 if (ctx->enhancement_type) {
2499 int load_backward_shape = get_bits1(gb);
2500 if (load_backward_shape)
2501 av_log(s->avctx, AV_LOG_ERROR,
2502 "load backward shape isn't supported\n");
2504 skip_bits(gb, 2); // ref_select_code
2507 /* detect buggy encoders which don't set the low_delay flag
2508 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2509 * easily (although it's buggy too) */
2510 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2511 ctx->divx_version == -1 && s->picture_number == 0) {
2512 av_log(s->avctx, AV_LOG_WARNING,
2513 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2517 s->picture_number++; // better than pic number==0 always ;)
2519 // FIXME add short header support
2520 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2521 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2523 if (s->workaround_bugs & FF_BUG_EDGE) {
2524 s->h_edge_pos = s->width;
2525 s->v_edge_pos = s->height;
2531 * Decode MPEG-4 headers.
2532 * @return <0 if no VOP found (or a damaged one)
2533 * FRAME_SKIPPED if a not coded VOP is found
2534 * 0 if a VOP is found
2536 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2538 MpegEncContext *s = &ctx->m;
2539 unsigned startcode, v;
2542 /* search next start code */
2545 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2547 if (get_bits(gb, 8) == 0xF0)
2553 if (get_bits_count(gb) >= gb->size_in_bits) {
2554 if (gb->size_in_bits == 8 &&
2555 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2556 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2557 return FRAME_SKIPPED; // divx bug
2559 return -1; // end of stream
2562 /* use the bits after the test */
2563 v = get_bits(gb, 8);
2564 startcode = ((startcode << 8) | v) & 0xffffffff;
2566 if ((startcode & 0xFFFFFF00) != 0x100)
2567 continue; // no startcode
2569 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2570 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2571 if (startcode <= 0x11F)
2572 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2573 else if (startcode <= 0x12F)
2574 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2575 else if (startcode <= 0x13F)
2576 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2577 else if (startcode <= 0x15F)
2578 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2579 else if (startcode <= 0x1AF)
2580 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2581 else if (startcode == 0x1B0)
2582 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2583 else if (startcode == 0x1B1)
2584 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2585 else if (startcode == 0x1B2)
2586 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2587 else if (startcode == 0x1B3)
2588 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2589 else if (startcode == 0x1B4)
2590 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2591 else if (startcode == 0x1B5)
2592 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2593 else if (startcode == 0x1B6)
2594 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2595 else if (startcode == 0x1B7)
2596 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2597 else if (startcode == 0x1B8)
2598 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2599 else if (startcode == 0x1B9)
2600 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2601 else if (startcode == 0x1BA)
2602 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2603 else if (startcode == 0x1BB)
2604 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2605 else if (startcode == 0x1BC)
2606 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2607 else if (startcode == 0x1BD)
2608 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2609 else if (startcode == 0x1BE)
2610 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2611 else if (startcode == 0x1BF)
2612 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2613 else if (startcode == 0x1C0)
2614 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2615 else if (startcode == 0x1C1)
2616 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2617 else if (startcode == 0x1C2)
2618 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2619 else if (startcode == 0x1C3)
2620 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2621 else if (startcode <= 0x1C5)
2622 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2623 else if (startcode <= 0x1FF)
2624 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2625 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2628 if (startcode >= 0x120 && startcode <= 0x12F) {
2629 if ((ret = decode_vol_header(ctx, gb)) < 0)
2631 } else if (startcode == USER_DATA_STARTCODE) {
2632 decode_user_data(ctx, gb);
2633 } else if (startcode == GOP_STARTCODE) {
2634 mpeg4_decode_gop_header(s, gb);
2635 } else if (startcode == VOS_STARTCODE) {
2636 mpeg4_decode_profile_level(s, gb);
2637 } else if (startcode == VOP_STARTCODE) {
2646 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2648 s->avctx->has_b_frames = !s->low_delay;
2650 return decode_vop_header(ctx, gb);
2653 av_cold void ff_mpeg4videodec_static_init(void) {
2654 static int done = 0;
2657 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2658 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2659 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2660 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2661 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2662 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2663 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2664 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2665 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2666 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2667 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2668 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2669 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2670 &ff_sprite_trajectory_tab[0][1], 4, 2,
2671 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2672 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2673 &ff_mb_type_b_tab[0][1], 2, 1,
2674 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2679 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2681 Mpeg4DecContext *ctx = avctx->priv_data;
2682 MpegEncContext *s = &ctx->m;
2684 /* divx 5.01+ bitstream reorder stuff */
2685 /* Since this clobbers the input buffer and hwaccel codecs still need the
2686 * data during hwaccel->end_frame we should not do this any earlier */
2687 if (s->divx_packed) {
2688 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2689 int startcode_found = 0;
2691 if (buf_size - current_pos > 7) {
2694 for (i = current_pos; i < buf_size - 4; i++)
2699 buf[i + 3] == 0xB6) {
2700 startcode_found = !(buf[i + 4] & 0x40);
2705 if (startcode_found) {
2706 if (!ctx->showed_packed_warning) {
2707 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2708 "wasteful way to store B-frames ('packed B-frames'). "
2709 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2710 ctx->showed_packed_warning = 1;
2712 av_fast_padded_malloc(&s->bitstream_buffer,
2713 &s->allocated_bitstream_buffer_size,
2714 buf_size - current_pos);
2715 if (!s->bitstream_buffer) {
2716 s->bitstream_buffer_size = 0;
2717 return AVERROR(ENOMEM);
2719 memcpy(s->bitstream_buffer, buf + current_pos,
2720 buf_size - current_pos);
2721 s->bitstream_buffer_size = buf_size - current_pos;
2729 static int mpeg4_update_thread_context(AVCodecContext *dst,
2730 const AVCodecContext *src)
2732 Mpeg4DecContext *s = dst->priv_data;
2733 const Mpeg4DecContext *s1 = src->priv_data;
2734 int init = s->m.context_initialized;
2736 int ret = ff_mpeg_update_thread_context(dst, src);
2741 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2743 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2744 ff_xvid_idct_init(&s->m.idsp, dst);
2750 static av_cold int decode_init(AVCodecContext *avctx)
2752 Mpeg4DecContext *ctx = avctx->priv_data;
2753 MpegEncContext *s = &ctx->m;
2759 ctx->lavc_build = -1;
2761 if ((ret = ff_h263_decode_init(avctx)) < 0)
2764 ff_mpeg4videodec_static_init();
2767 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2768 s->decode_mb = mpeg4_decode_mb;
2769 ctx->time_increment_bits = 4; /* default value for broken headers */
2771 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2772 avctx->internal->allocate_progress = 1;
2777 static const AVOption mpeg4_options[] = {
2778 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2779 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2783 static const AVClass mpeg4_class = {
2784 "MPEG4 Video Decoder",
2785 av_default_item_name,
2787 LIBAVUTIL_VERSION_INT,
2790 AVCodec ff_mpeg4_decoder = {
2792 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2793 .type = AVMEDIA_TYPE_VIDEO,
2794 .id = AV_CODEC_ID_MPEG4,
2795 .priv_data_size = sizeof(Mpeg4DecContext),
2796 .init = decode_init,
2797 .close = ff_h263_decode_end,
2798 .decode = ff_h263_decode_frame,
2799 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2800 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2801 AV_CODEC_CAP_FRAME_THREADS,
2802 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2803 .flush = ff_mpeg_flush,
2805 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2806 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2807 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2808 .priv_class = &mpeg4_class,
2812 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2813 static const AVClass mpeg4_vdpau_class = {
2814 "MPEG4 Video VDPAU Decoder",
2815 av_default_item_name,
2817 LIBAVUTIL_VERSION_INT,
2820 AVCodec ff_mpeg4_vdpau_decoder = {
2821 .name = "mpeg4_vdpau",
2822 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2823 .type = AVMEDIA_TYPE_VIDEO,
2824 .id = AV_CODEC_ID_MPEG4,
2825 .priv_data_size = sizeof(Mpeg4DecContext),
2826 .init = decode_init,
2827 .close = ff_h263_decode_end,
2828 .decode = ff_h263_decode_frame,
2829 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2830 AV_CODEC_CAP_HWACCEL_VDPAU,
2831 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2833 .priv_class = &mpeg4_vdpau_class,