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];
181 int64_t sprite_offset[2][2];
183 // only true for rectangle shapes
184 const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
185 { 0, s->height }, { s->width, s->height } };
186 int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
188 if (w <= 0 || h <= 0)
189 return AVERROR_INVALIDDATA;
191 for (i = 0; i < ctx->num_sprite_warping_points; i++) {
195 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
197 x = get_xbits(gb, length);
199 if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
200 check_marker(s->avctx, gb, "before sprite_trajectory");
202 length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
204 y = get_xbits(gb, length);
206 check_marker(s->avctx, gb, "after sprite_trajectory");
207 ctx->sprite_traj[i][0] = d[i][0] = x;
208 ctx->sprite_traj[i][1] = d[i][1] = y;
211 ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
213 while ((1 << alpha) < w)
215 while ((1 << beta) < h)
216 beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
220 // Note, the 4th point isn't used for GMC
221 if (ctx->divx_version == 500 && ctx->divx_build == 413) {
222 sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
223 sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
224 sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
225 sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
226 sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
227 sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
229 sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
230 sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
231 sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
232 sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
233 sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
234 sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
236 /* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
237 * sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
239 /* This is mostly identical to the MPEG-4 std (and is totally unreadable
240 * because of that...). Perhaps it should be reordered to be more readable.
241 * The idea behind this virtual_ref mess is to be able to use shifts later
242 * per pixel instead of divides so the distance between points is converted
243 * from w&h based to w2&h2 based which are of the 2^x form. */
244 virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
245 ROUNDED_DIV(((w - w2) *
246 (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
247 w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
248 virtual_ref[0][1] = 16 * vop_ref[0][1] +
249 ROUNDED_DIV(((w - w2) *
250 (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
251 w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
252 virtual_ref[1][0] = 16 * vop_ref[0][0] +
253 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
254 h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
255 virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
256 ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
257 h2 * (r * sprite_ref[2][1] - 16 * vop_ref[2][1])), h);
259 switch (ctx->num_sprite_warping_points) {
261 sprite_offset[0][0] =
262 sprite_offset[0][1] =
263 sprite_offset[1][0] =
264 sprite_offset[1][1] = 0;
265 s->sprite_delta[0][0] = a;
266 s->sprite_delta[0][1] =
267 s->sprite_delta[1][0] = 0;
268 s->sprite_delta[1][1] = a;
269 ctx->sprite_shift[0] =
270 ctx->sprite_shift[1] = 0;
273 sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
274 sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
275 sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
276 a * (vop_ref[0][0] / 2);
277 sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
278 a * (vop_ref[0][1] / 2);
279 s->sprite_delta[0][0] = a;
280 s->sprite_delta[0][1] =
281 s->sprite_delta[1][0] = 0;
282 s->sprite_delta[1][1] = a;
283 ctx->sprite_shift[0] =
284 ctx->sprite_shift[1] = 0;
287 sprite_offset[0][0] = (sprite_ref[0][0] * (1 << alpha + rho)) +
288 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
290 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
291 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
292 sprite_offset[0][1] = (sprite_ref[0][1] * (1 << alpha + rho)) +
293 (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
295 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
296 (-vop_ref[0][1]) + (1 << (alpha + rho - 1));
297 sprite_offset[1][0] = ((-r * sprite_ref[0][0] + virtual_ref[0][0]) *
298 (-2 * vop_ref[0][0] + 1) +
299 (r * sprite_ref[0][1] - virtual_ref[0][1]) *
300 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
301 sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
302 sprite_offset[1][1] = ((-r * sprite_ref[0][1] + virtual_ref[0][1]) *
303 (-2 * vop_ref[0][0] + 1) +
304 (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
305 (-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
306 sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
307 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
308 s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
309 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
310 s->sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
312 ctx->sprite_shift[0] = alpha + rho;
313 ctx->sprite_shift[1] = alpha + rho + 2;
316 min_ab = FFMIN(alpha, beta);
319 sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
320 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
321 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
322 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
323 sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
324 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
325 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
326 ((int64_t)1 << (alpha + beta + rho - min_ab - 1));
327 sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
328 ((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
329 (int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
330 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
331 sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
332 ((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
333 (int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
334 ((int64_t)1 << (alpha + beta + rho - min_ab + 1));
335 s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
336 s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
337 s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
338 s->sprite_delta[1][1] = (-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3;
340 ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
341 ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
344 /* try to simplify the situation */
345 if (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
346 s->sprite_delta[0][1] == 0 &&
347 s->sprite_delta[1][0] == 0 &&
348 s->sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
349 sprite_offset[0][0] >>= ctx->sprite_shift[0];
350 sprite_offset[0][1] >>= ctx->sprite_shift[0];
351 sprite_offset[1][0] >>= ctx->sprite_shift[1];
352 sprite_offset[1][1] >>= ctx->sprite_shift[1];
353 s->sprite_delta[0][0] = a;
354 s->sprite_delta[0][1] = 0;
355 s->sprite_delta[1][0] = 0;
356 s->sprite_delta[1][1] = a;
357 ctx->sprite_shift[0] = 0;
358 ctx->sprite_shift[1] = 0;
359 s->real_sprite_warping_points = 1;
361 int shift_y = 16 - ctx->sprite_shift[0];
362 int shift_c = 16 - ctx->sprite_shift[1];
364 if (shift_c < 0 || shift_y < 0 ||
365 FFABS(sprite_offset[0][0]) >= INT_MAX >> shift_y ||
366 FFABS(sprite_offset[1][0]) >= INT_MAX >> shift_c ||
367 FFABS(sprite_offset[0][1]) >= INT_MAX >> shift_y ||
368 FFABS(sprite_offset[1][1]) >= INT_MAX >> shift_c
370 avpriv_request_sample(s->avctx, "Too large sprite shift or offset");
374 for (i = 0; i < 2; i++) {
375 sprite_offset[0][i] *= 1 << shift_y;
376 sprite_offset[1][i] *= 1 << shift_c;
377 s->sprite_delta[0][i] *= 1 << shift_y;
378 s->sprite_delta[1][i] *= 1 << shift_y;
379 ctx->sprite_shift[i] = 16;
382 for (i = 0; i < 2; i++) {
384 s->sprite_delta[i][0] - a * (1LL<<16),
385 s->sprite_delta[i][1] - a * (1LL<<16)
388 if (llabs(sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
389 llabs(sprite_offset[0][i] + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
390 llabs(sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL) + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
391 llabs(s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
392 llabs(s->sprite_delta[i][1] * (w+16LL)) >= INT_MAX ||
393 llabs(sd[0]) >= INT_MAX ||
394 llabs(sd[1]) >= INT_MAX ||
395 llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
396 llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
397 llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
399 avpriv_request_sample(s->avctx, "Overflow on sprite points");
403 s->real_sprite_warping_points = ctx->num_sprite_warping_points;
406 s->sprite_offset[0][0] = sprite_offset[0][0];
407 s->sprite_offset[0][1] = sprite_offset[0][1];
408 s->sprite_offset[1][0] = sprite_offset[1][0];
409 s->sprite_offset[1][1] = sprite_offset[1][1];
413 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
414 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
415 return AVERROR_PATCHWELCOME;
418 static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
419 MpegEncContext *s = &ctx->m;
420 int len = FFMIN(ctx->time_increment_bits + 3, 15);
425 check_marker(s->avctx, gb, "after new_pred");
431 * Decode the next video packet.
432 * @return <0 if something went wrong
434 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
436 MpegEncContext *s = &ctx->m;
438 int mb_num_bits = av_log2(s->mb_num - 1) + 1;
439 int header_extension = 0, mb_num, len;
441 /* is there enough space left for a video packet + header */
442 if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
445 for (len = 0; len < 32; len++)
446 if (get_bits1(&s->gb))
449 if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
450 av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
454 if (ctx->shape != RECT_SHAPE) {
455 header_extension = get_bits1(&s->gb);
456 // FIXME more stuff here
459 mb_num = get_bits(&s->gb, mb_num_bits);
460 if (mb_num >= s->mb_num) {
461 av_log(s->avctx, AV_LOG_ERROR,
462 "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
466 s->mb_x = mb_num % s->mb_width;
467 s->mb_y = mb_num / s->mb_width;
469 if (ctx->shape != BIN_ONLY_SHAPE) {
470 int qscale = get_bits(&s->gb, s->quant_precision);
472 s->chroma_qscale = s->qscale = qscale;
475 if (ctx->shape == RECT_SHAPE)
476 header_extension = get_bits1(&s->gb);
478 if (header_extension) {
481 while (get_bits1(&s->gb) != 0)
484 check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
485 skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
486 check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
488 skip_bits(&s->gb, 2); /* vop coding type */
489 // FIXME not rect stuff here
491 if (ctx->shape != BIN_ONLY_SHAPE) {
492 skip_bits(&s->gb, 3); /* intra dc vlc threshold */
493 // FIXME don't just ignore everything
494 if (s->pict_type == AV_PICTURE_TYPE_S &&
495 ctx->vol_sprite_usage == GMC_SPRITE) {
496 if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
497 return AVERROR_INVALIDDATA;
498 av_log(s->avctx, AV_LOG_ERROR, "untested\n");
501 // FIXME reduced res stuff here
503 if (s->pict_type != AV_PICTURE_TYPE_I) {
504 int f_code = get_bits(&s->gb, 3); /* fcode_for */
506 av_log(s->avctx, AV_LOG_ERROR,
507 "Error, video packet header damaged (f_code=0)\n");
509 if (s->pict_type == AV_PICTURE_TYPE_B) {
510 int b_code = get_bits(&s->gb, 3);
512 av_log(s->avctx, AV_LOG_ERROR,
513 "Error, video packet header damaged (b_code=0)\n");
518 decode_new_pred(ctx, &s->gb);
524 * Get the average motion vector for a GMC MB.
525 * @param n either 0 for the x component or 1 for y
526 * @return the average MV for a GMC MB
528 static inline int get_amv(Mpeg4DecContext *ctx, int n)
530 MpegEncContext *s = &ctx->m;
531 int x, y, mb_v, sum, dx, dy, shift;
532 int len = 1 << (s->f_code + 4);
533 const int a = s->sprite_warping_accuracy;
535 if (s->workaround_bugs & FF_BUG_AMV)
536 len >>= s->quarter_sample;
538 if (s->real_sprite_warping_points == 1) {
539 if (ctx->divx_version == 500 && ctx->divx_build == 413)
540 sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
542 sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
544 dx = s->sprite_delta[n][0];
545 dy = s->sprite_delta[n][1];
546 shift = ctx->sprite_shift[0];
548 dy -= 1 << (shift + a + 1);
550 dx -= 1 << (shift + a + 1);
551 mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16 + dy * s->mb_y * 16;
554 for (y = 0; y < 16; y++) {
559 for (x = 0; x < 16; x++) {
564 sum = RSHIFT(sum, a + 8 - s->quarter_sample);
576 * Decode the dc value.
577 * @param n block index (0-3 are luma, 4-5 are chroma)
578 * @param dir_ptr the prediction direction will be stored here
579 * @return the quantized dc
581 static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
586 code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
588 code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
590 if (code < 0 || code > 9 /* && s->nbit < 9 */) {
591 av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
600 level = 2 * get_bits1(&s->gb) - 1;
602 if (get_bits1(&s->gb))
603 level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
605 level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
608 level = get_xbits(&s->gb, code);
612 if (get_bits1(&s->gb) == 0) { /* marker */
613 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
614 av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
621 return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
625 * Decode first partition.
626 * @return number of MBs decoded or <0 if an error occurred
628 static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
630 MpegEncContext *s = &ctx->m;
632 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
634 /* decode first partition */
635 s->first_slice_line = 1;
636 for (; s->mb_y < s->mb_height; s->mb_y++) {
637 ff_init_block_index(s);
638 for (; s->mb_x < s->mb_width; s->mb_x++) {
639 const int xy = s->mb_x + s->mb_y * s->mb_stride;
644 ff_update_block_index(s);
645 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
646 s->first_slice_line = 0;
648 if (s->pict_type == AV_PICTURE_TYPE_I) {
652 if (show_bits_long(&s->gb, 19) == DC_MARKER)
655 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
657 av_log(s->avctx, AV_LOG_ERROR,
658 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
663 s->cbp_table[xy] = cbpc & 3;
664 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
668 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
670 s->current_picture.qscale_table[xy] = s->qscale;
672 s->mbintra_table[xy] = 1;
673 for (i = 0; i < 6; i++) {
675 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
677 av_log(s->avctx, AV_LOG_ERROR,
678 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
685 s->pred_dir_table[xy] = dir;
686 } else { /* P/S_TYPE */
687 int mx, my, pred_x, pred_y, bits;
688 int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
689 const int stride = s->b8_stride * 2;
692 bits = show_bits(&s->gb, 17);
693 if (bits == MOTION_MARKER)
697 if (bits & 0x10000) {
699 if (s->pict_type == AV_PICTURE_TYPE_S &&
700 ctx->vol_sprite_usage == GMC_SPRITE) {
701 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
705 mx = get_amv(ctx, 0);
706 my = get_amv(ctx, 1);
708 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
715 mot_val[0 + stride] =
716 mot_val[2 + stride] = mx;
719 mot_val[1 + stride] =
720 mot_val[3 + stride] = my;
722 if (s->mbintra_table[xy])
723 ff_clean_intra_table_entries(s);
727 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
729 av_log(s->avctx, AV_LOG_ERROR,
730 "mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
736 s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
738 s->mb_intra = ((cbpc & 4) != 0);
741 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
742 s->mbintra_table[xy] = 1;
745 mot_val[0 + stride] =
746 mot_val[2 + stride] = 0;
749 mot_val[1 + stride] =
750 mot_val[3 + stride] = 0;
752 if (s->mbintra_table[xy])
753 ff_clean_intra_table_entries(s);
755 if (s->pict_type == AV_PICTURE_TYPE_S &&
756 ctx->vol_sprite_usage == GMC_SPRITE &&
758 s->mcsel = get_bits1(&s->gb);
762 if ((cbpc & 16) == 0) {
763 /* 16x16 motion prediction */
765 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
767 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
771 my = ff_h263_decode_motion(s, pred_y, s->f_code);
774 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
777 mx = get_amv(ctx, 0);
778 my = get_amv(ctx, 1);
779 s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
786 mot_val[0 + stride] =
787 mot_val[2 + stride] = mx;
790 mot_val[1 + stride] =
791 mot_val[3 + stride] = my;
794 s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
796 for (i = 0; i < 4; i++) {
797 int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
798 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
802 my = ff_h263_decode_motion(s, pred_y, s->f_code);
819 * decode second partition.
820 * @return <0 if an error occurred
822 static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
825 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
827 s->mb_x = s->resync_mb_x;
828 s->first_slice_line = 1;
829 for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
830 ff_init_block_index(s);
831 for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
832 const int xy = s->mb_x + s->mb_y * s->mb_stride;
835 ff_update_block_index(s);
836 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
837 s->first_slice_line = 0;
839 if (s->pict_type == AV_PICTURE_TYPE_I) {
840 int ac_pred = get_bits1(&s->gb);
841 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
843 av_log(s->avctx, AV_LOG_ERROR,
844 "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
848 s->cbp_table[xy] |= cbpy << 2;
849 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
850 } else { /* P || S_TYPE */
851 if (IS_INTRA(s->current_picture.mb_type[xy])) {
854 int ac_pred = get_bits1(&s->gb);
855 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
858 av_log(s->avctx, AV_LOG_ERROR,
859 "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
863 if (s->cbp_table[xy] & 8)
864 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
865 s->current_picture.qscale_table[xy] = s->qscale;
867 for (i = 0; i < 6; i++) {
869 int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
871 av_log(s->avctx, AV_LOG_ERROR,
872 "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
879 s->cbp_table[xy] &= 3; // remove dquant
880 s->cbp_table[xy] |= cbpy << 2;
881 s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
882 s->pred_dir_table[xy] = dir;
883 } else if (IS_SKIP(s->current_picture.mb_type[xy])) {
884 s->current_picture.qscale_table[xy] = s->qscale;
885 s->cbp_table[xy] = 0;
887 int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
890 av_log(s->avctx, AV_LOG_ERROR,
891 "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
895 if (s->cbp_table[xy] & 8)
896 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
897 s->current_picture.qscale_table[xy] = s->qscale;
899 s->cbp_table[xy] &= 3; // remove dquant
900 s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
904 if (mb_num >= mb_count)
912 * Decode the first and second partition.
913 * @return <0 if error (and sets error type in the error_status_table)
915 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
917 MpegEncContext *s = &ctx->m;
919 const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
920 const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
922 mb_num = mpeg4_decode_partition_a(ctx);
924 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
925 s->mb_x, s->mb_y, part_a_error);
929 if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
930 av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
931 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
932 s->mb_x, s->mb_y, part_a_error);
936 s->mb_num_left = mb_num;
938 if (s->pict_type == AV_PICTURE_TYPE_I) {
939 while (show_bits(&s->gb, 9) == 1)
940 skip_bits(&s->gb, 9);
941 if (get_bits_long(&s->gb, 19) != DC_MARKER) {
942 av_log(s->avctx, AV_LOG_ERROR,
943 "marker missing after first I partition at %d %d\n",
948 while (show_bits(&s->gb, 10) == 1)
949 skip_bits(&s->gb, 10);
950 if (get_bits(&s->gb, 17) != MOTION_MARKER) {
951 av_log(s->avctx, AV_LOG_ERROR,
952 "marker missing after first P partition at %d %d\n",
957 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
958 s->mb_x - 1, s->mb_y, part_a_end);
960 if (mpeg4_decode_partition_b(s, mb_num) < 0) {
961 if (s->pict_type == AV_PICTURE_TYPE_P)
962 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
963 s->mb_x, s->mb_y, ER_DC_ERROR);
966 if (s->pict_type == AV_PICTURE_TYPE_P)
967 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
968 s->mb_x - 1, s->mb_y, ER_DC_END);
976 * @return <0 if an error occurred
978 static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
979 int n, int coded, int intra, int rvlc)
981 MpegEncContext *s = &ctx->m;
982 int level, i, last, run, qmul, qadd;
983 int av_uninit(dc_pred_dir);
986 const uint8_t *scan_table;
988 // Note intra & rvlc should be optimized away if this is inlined
991 if (ctx->use_intra_dc_vlc) {
993 if (s->partitioned_frame) {
994 level = s->dc_val[0][s->block_index[n]];
996 level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
998 level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
999 dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
1001 level = mpeg4_decode_dc(s, n, &dc_pred_dir);
1009 ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
1015 rl = &ff_rvlc_rl_intra;
1016 rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
1018 rl = &ff_mpeg4_rl_intra;
1019 rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
1022 if (dc_pred_dir == 0)
1023 scan_table = s->intra_v_scantable.permutated; /* left */
1025 scan_table = s->intra_h_scantable.permutated; /* top */
1027 scan_table = s->intra_scantable.permutated;
1034 s->block_last_index[n] = i;
1038 rl = &ff_rvlc_rl_inter;
1040 rl = &ff_h263_rl_inter;
1042 scan_table = s->intra_scantable.permutated;
1044 if (s->mpeg_quant) {
1048 rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
1050 rl_vlc = ff_h263_rl_inter.rl_vlc[0];
1052 qmul = s->qscale << 1;
1053 qadd = (s->qscale - 1) | 1;
1055 rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
1057 rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
1061 OPEN_READER(re, &s->gb);
1063 UPDATE_CACHE(re, &s->gb);
1064 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
1068 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1069 av_log(s->avctx, AV_LOG_ERROR,
1070 "1. marker bit missing in rvlc esc\n");
1073 SKIP_CACHE(re, &s->gb, 1);
1075 last = SHOW_UBITS(re, &s->gb, 1);
1076 SKIP_CACHE(re, &s->gb, 1);
1077 run = SHOW_UBITS(re, &s->gb, 6);
1078 SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
1079 UPDATE_CACHE(re, &s->gb);
1081 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1082 av_log(s->avctx, AV_LOG_ERROR,
1083 "2. marker bit missing in rvlc esc\n");
1086 SKIP_CACHE(re, &s->gb, 1);
1088 level = SHOW_UBITS(re, &s->gb, 11);
1089 SKIP_CACHE(re, &s->gb, 11);
1091 if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
1092 av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
1095 SKIP_CACHE(re, &s->gb, 5);
1097 level = level * qmul + qadd;
1098 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1099 SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
1106 cache = GET_CACHE(re, &s->gb);
1109 cache ^= 0xC0000000;
1111 if (cache & 0x80000000) {
1112 if (cache & 0x40000000) {
1114 SKIP_CACHE(re, &s->gb, 2);
1115 last = SHOW_UBITS(re, &s->gb, 1);
1116 SKIP_CACHE(re, &s->gb, 1);
1117 run = SHOW_UBITS(re, &s->gb, 6);
1118 SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
1119 UPDATE_CACHE(re, &s->gb);
1122 level = SHOW_SBITS(re, &s->gb, 12);
1123 LAST_SKIP_BITS(re, &s->gb, 12);
1125 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1126 av_log(s->avctx, AV_LOG_ERROR,
1127 "1. marker bit missing in 3. esc\n");
1128 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1131 SKIP_CACHE(re, &s->gb, 1);
1133 level = SHOW_SBITS(re, &s->gb, 12);
1134 SKIP_CACHE(re, &s->gb, 12);
1136 if (SHOW_UBITS(re, &s->gb, 1) == 0) {
1137 av_log(s->avctx, AV_LOG_ERROR,
1138 "2. marker bit missing in 3. esc\n");
1139 if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
1143 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
1147 if (s->error_recognition >= FF_ER_COMPLIANT) {
1148 const int abs_level= FFABS(level);
1149 if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
1150 const int run1= run - rl->max_run[last][abs_level] - 1;
1151 if (abs_level <= rl->max_level[last][run]) {
1152 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
1155 if (s->error_recognition > FF_ER_COMPLIANT) {
1156 if (abs_level <= rl->max_level[last][run]*2) {
1157 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
1160 if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
1161 av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
1169 level = level * qmul + qadd;
1171 level = level * qmul - qadd;
1173 if ((unsigned)(level + 2048) > 4095) {
1174 if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
1175 if (level > 2560 || level < -2560) {
1176 av_log(s->avctx, AV_LOG_ERROR,
1177 "|level| overflow in 3. esc, qp=%d\n",
1182 level = level < 0 ? -2048 : 2047;
1190 SKIP_BITS(re, &s->gb, 2);
1191 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1192 i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
1193 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1194 LAST_SKIP_BITS(re, &s->gb, 1);
1198 SKIP_BITS(re, &s->gb, 1);
1199 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
1201 level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
1202 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1203 LAST_SKIP_BITS(re, &s->gb, 1);
1208 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1209 LAST_SKIP_BITS(re, &s->gb, 1);
1211 ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
1215 av_log(s->avctx, AV_LOG_ERROR,
1216 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1220 block[scan_table[i]] = level;
1224 block[scan_table[i]] = level;
1226 CLOSE_READER(re, &s->gb);
1231 if (!ctx->use_intra_dc_vlc) {
1232 block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
1234 i -= i >> 31; // if (i == -1) i = 0;
1237 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
1239 i = 63; // FIXME not optimal
1241 s->block_last_index[n] = i;
1246 * decode partition C of one MB.
1247 * @return <0 if an error occurred
1249 static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
1251 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1253 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1255 mb_type = s->current_picture.mb_type[xy];
1256 cbp = s->cbp_table[xy];
1258 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1260 if (s->current_picture.qscale_table[xy] != s->qscale)
1261 ff_set_qscale(s, s->current_picture.qscale_table[xy]);
1263 if (s->pict_type == AV_PICTURE_TYPE_P ||
1264 s->pict_type == AV_PICTURE_TYPE_S) {
1266 for (i = 0; i < 4; i++) {
1267 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
1268 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
1270 s->mb_intra = IS_INTRA(mb_type);
1272 if (IS_SKIP(mb_type)) {
1274 for (i = 0; i < 6; i++)
1275 s->block_last_index[i] = -1;
1276 s->mv_dir = MV_DIR_FORWARD;
1277 s->mv_type = MV_TYPE_16X16;
1278 if (s->pict_type == AV_PICTURE_TYPE_S
1279 && ctx->vol_sprite_usage == GMC_SPRITE) {
1286 } else if (s->mb_intra) {
1287 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1288 } else if (!s->mb_intra) {
1289 // s->mcsel = 0; // FIXME do we need to init that?
1291 s->mv_dir = MV_DIR_FORWARD;
1292 if (IS_8X8(mb_type)) {
1293 s->mv_type = MV_TYPE_8X8;
1295 s->mv_type = MV_TYPE_16X16;
1298 } else { /* I-Frame */
1300 s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
1303 if (!IS_SKIP(mb_type)) {
1305 s->bdsp.clear_blocks(s->block[0]);
1306 /* decode each block */
1307 for (i = 0; i < 6; i++) {
1308 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
1309 av_log(s->avctx, AV_LOG_ERROR,
1310 "texture corrupted at %d %d %d\n",
1311 s->mb_x, s->mb_y, s->mb_intra);
1318 /* per-MB end of slice check */
1319 if (--s->mb_num_left <= 0) {
1320 if (mpeg4_is_resync(ctx))
1325 if (mpeg4_is_resync(ctx)) {
1326 const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
1327 if (s->cbp_table[xy + delta])
1334 static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
1336 Mpeg4DecContext *ctx = (Mpeg4DecContext *)s;
1337 int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
1339 static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
1340 const int xy = s->mb_x + s->mb_y * s->mb_stride;
1342 av_assert2(s->h263_pred);
1344 if (s->pict_type == AV_PICTURE_TYPE_P ||
1345 s->pict_type == AV_PICTURE_TYPE_S) {
1347 if (get_bits1(&s->gb)) {
1350 for (i = 0; i < 6; i++)
1351 s->block_last_index[i] = -1;
1352 s->mv_dir = MV_DIR_FORWARD;
1353 s->mv_type = MV_TYPE_16X16;
1354 if (s->pict_type == AV_PICTURE_TYPE_S &&
1355 ctx->vol_sprite_usage == GMC_SPRITE) {
1356 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1361 s->mv[0][0][0] = get_amv(ctx, 0);
1362 s->mv[0][0][1] = get_amv(ctx, 1);
1365 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1375 cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
1377 av_log(s->avctx, AV_LOG_ERROR,
1378 "mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1381 } while (cbpc == 20);
1383 s->bdsp.clear_blocks(s->block[0]);
1385 s->mb_intra = ((cbpc & 4) != 0);
1389 if (s->pict_type == AV_PICTURE_TYPE_S &&
1390 ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
1391 s->mcsel = get_bits1(&s->gb);
1394 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
1396 av_log(s->avctx, AV_LOG_ERROR,
1397 "P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1398 return AVERROR_INVALIDDATA;
1401 cbp = (cbpc & 3) | (cbpy << 2);
1403 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1404 if ((!s->progressive_sequence) &&
1405 (cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
1406 s->interlaced_dct = get_bits1(&s->gb);
1408 s->mv_dir = MV_DIR_FORWARD;
1409 if ((cbpc & 16) == 0) {
1411 s->current_picture.mb_type[xy] = MB_TYPE_GMC |
1414 /* 16x16 global motion prediction */
1415 s->mv_type = MV_TYPE_16X16;
1416 mx = get_amv(ctx, 0);
1417 my = get_amv(ctx, 1);
1418 s->mv[0][0][0] = mx;
1419 s->mv[0][0][1] = my;
1420 } else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
1421 s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
1424 /* 16x8 field motion prediction */
1425 s->mv_type = MV_TYPE_FIELD;
1427 s->field_select[0][0] = get_bits1(&s->gb);
1428 s->field_select[0][1] = get_bits1(&s->gb);
1430 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1432 for (i = 0; i < 2; i++) {
1433 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1437 my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
1441 s->mv[0][i][0] = mx;
1442 s->mv[0][i][1] = my;
1445 s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
1446 /* 16x16 motion prediction */
1447 s->mv_type = MV_TYPE_16X16;
1448 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
1449 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1454 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1458 s->mv[0][0][0] = mx;
1459 s->mv[0][0][1] = my;
1462 s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
1463 s->mv_type = MV_TYPE_8X8;
1464 for (i = 0; i < 4; i++) {
1465 mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
1466 mx = ff_h263_decode_motion(s, pred_x, s->f_code);
1470 my = ff_h263_decode_motion(s, pred_y, s->f_code);
1473 s->mv[0][i][0] = mx;
1474 s->mv[0][i][1] = my;
1479 } else if (s->pict_type == AV_PICTURE_TYPE_B) {
1480 int modb1; // first bit of modb
1481 int modb2; // second bit of modb
1484 s->mb_intra = 0; // B-frames never contain intra blocks
1485 s->mcsel = 0; // ... true gmc blocks
1488 for (i = 0; i < 2; i++) {
1489 s->last_mv[i][0][0] =
1490 s->last_mv[i][0][1] =
1491 s->last_mv[i][1][0] =
1492 s->last_mv[i][1][1] = 0;
1495 ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
1498 /* if we skipped it in the future P-frame than skip it now too */
1499 s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
1501 if (s->mb_skipped) {
1503 for (i = 0; i < 6; i++)
1504 s->block_last_index[i] = -1;
1506 s->mv_dir = MV_DIR_FORWARD;
1507 s->mv_type = MV_TYPE_16X16;
1512 s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
1518 modb1 = get_bits1(&s->gb);
1520 // like MB_TYPE_B_DIRECT but no vectors coded
1521 mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
1524 modb2 = get_bits1(&s->gb);
1525 mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
1527 av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
1530 mb_type = mb_type_b_map[mb_type];
1534 s->bdsp.clear_blocks(s->block[0]);
1535 cbp = get_bits(&s->gb, 6);
1538 if ((!IS_DIRECT(mb_type)) && cbp) {
1539 if (get_bits1(&s->gb))
1540 ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
1543 if (!s->progressive_sequence) {
1545 s->interlaced_dct = get_bits1(&s->gb);
1547 if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
1548 mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
1549 mb_type &= ~MB_TYPE_16x16;
1551 if (USES_LIST(mb_type, 0)) {
1552 s->field_select[0][0] = get_bits1(&s->gb);
1553 s->field_select[0][1] = get_bits1(&s->gb);
1555 if (USES_LIST(mb_type, 1)) {
1556 s->field_select[1][0] = get_bits1(&s->gb);
1557 s->field_select[1][1] = get_bits1(&s->gb);
1563 if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
1564 s->mv_type = MV_TYPE_16X16;
1566 if (USES_LIST(mb_type, 0)) {
1567 s->mv_dir = MV_DIR_FORWARD;
1569 mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
1570 my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
1571 s->last_mv[0][1][0] =
1572 s->last_mv[0][0][0] =
1573 s->mv[0][0][0] = mx;
1574 s->last_mv[0][1][1] =
1575 s->last_mv[0][0][1] =
1576 s->mv[0][0][1] = my;
1579 if (USES_LIST(mb_type, 1)) {
1580 s->mv_dir |= MV_DIR_BACKWARD;
1582 mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
1583 my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
1584 s->last_mv[1][1][0] =
1585 s->last_mv[1][0][0] =
1586 s->mv[1][0][0] = mx;
1587 s->last_mv[1][1][1] =
1588 s->last_mv[1][0][1] =
1589 s->mv[1][0][1] = my;
1591 } else if (!IS_DIRECT(mb_type)) {
1592 s->mv_type = MV_TYPE_FIELD;
1594 if (USES_LIST(mb_type, 0)) {
1595 s->mv_dir = MV_DIR_FORWARD;
1597 for (i = 0; i < 2; i++) {
1598 mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
1599 my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
1600 s->last_mv[0][i][0] =
1601 s->mv[0][i][0] = mx;
1602 s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
1606 if (USES_LIST(mb_type, 1)) {
1607 s->mv_dir |= MV_DIR_BACKWARD;
1609 for (i = 0; i < 2; i++) {
1610 mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
1611 my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
1612 s->last_mv[1][i][0] =
1613 s->mv[1][i][0] = mx;
1614 s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
1620 if (IS_DIRECT(mb_type)) {
1621 if (IS_SKIP(mb_type)) {
1625 mx = ff_h263_decode_motion(s, 0, 1);
1626 my = ff_h263_decode_motion(s, 0, 1);
1629 s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
1630 mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
1632 s->current_picture.mb_type[xy] = mb_type;
1633 } else { /* I-Frame */
1635 cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
1637 av_log(s->avctx, AV_LOG_ERROR,
1638 "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
1641 } while (cbpc == 8);
1647 s->ac_pred = get_bits1(&s->gb);
1649 s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
1651 s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
1653 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
1655 av_log(s->avctx, AV_LOG_ERROR,
1656 "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
1659 cbp = (cbpc & 3) | (cbpy << 2);
1661 ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
1664 ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
1666 if (!s->progressive_sequence)
1667 s->interlaced_dct = get_bits1(&s->gb);
1669 s->bdsp.clear_blocks(s->block[0]);
1670 /* decode each block */
1671 for (i = 0; i < 6; i++) {
1672 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
1679 /* decode each block */
1680 for (i = 0; i < 6; i++) {
1681 if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
1687 /* per-MB end of slice check */
1688 if (s->codec_id == AV_CODEC_ID_MPEG4) {
1689 int next = mpeg4_is_resync(ctx);
1691 if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
1693 } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
1696 if (s->pict_type == AV_PICTURE_TYPE_B) {
1697 const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
1698 ff_thread_await_progress(&s->next_picture_ptr->tf,
1699 (s->mb_x + delta >= s->mb_width)
1700 ? FFMIN(s->mb_y + 1, s->mb_height - 1)
1702 if (s->next_picture.mbskip_table[xy + delta])
1713 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
1715 int hours, minutes, seconds;
1717 if (!show_bits(gb, 23)) {
1718 av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
1722 hours = get_bits(gb, 5);
1723 minutes = get_bits(gb, 6);
1724 check_marker(s->avctx, gb, "in gop_header");
1725 seconds = get_bits(gb, 6);
1727 s->time_base = seconds + 60*(minutes + 60*hours);
1735 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
1738 s->avctx->profile = get_bits(gb, 4);
1739 s->avctx->level = get_bits(gb, 4);
1741 // for Simple profile, level 0
1742 if (s->avctx->profile == 0 && s->avctx->level == 8) {
1743 s->avctx->level = 0;
1749 static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
1751 MpegEncContext *s = &ctx->m;
1752 int width, height, vo_ver_id;
1755 skip_bits(gb, 1); /* random access */
1756 s->vo_type = get_bits(gb, 8);
1757 if (get_bits1(gb) != 0) { /* is_ol_id */
1758 vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
1759 skip_bits(gb, 3); /* vo_priority */
1763 s->aspect_ratio_info = get_bits(gb, 4);
1764 if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
1765 s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
1766 s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
1768 s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
1771 if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
1772 int chroma_format = get_bits(gb, 2);
1773 if (chroma_format != CHROMA_420)
1774 av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
1776 s->low_delay = get_bits1(gb);
1777 if (get_bits1(gb)) { /* vbv parameters */
1778 get_bits(gb, 15); /* first_half_bitrate */
1779 check_marker(s->avctx, gb, "after first_half_bitrate");
1780 get_bits(gb, 15); /* latter_half_bitrate */
1781 check_marker(s->avctx, gb, "after latter_half_bitrate");
1782 get_bits(gb, 15); /* first_half_vbv_buffer_size */
1783 check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
1784 get_bits(gb, 3); /* latter_half_vbv_buffer_size */
1785 get_bits(gb, 11); /* first_half_vbv_occupancy */
1786 check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
1787 get_bits(gb, 15); /* latter_half_vbv_occupancy */
1788 check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
1791 /* is setting low delay flag only once the smartest thing to do?
1792 * low delay detection will not be overridden. */
1793 if (s->picture_number == 0) {
1794 switch(s->vo_type) {
1795 case SIMPLE_VO_TYPE:
1796 case ADV_SIMPLE_VO_TYPE:
1805 ctx->shape = get_bits(gb, 2); /* vol shape */
1806 if (ctx->shape != RECT_SHAPE)
1807 av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
1808 if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
1809 av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
1810 skip_bits(gb, 4); /* video_object_layer_shape_extension */
1813 check_marker(s->avctx, gb, "before time_increment_resolution");
1815 s->avctx->framerate.num = get_bits(gb, 16);
1816 if (!s->avctx->framerate.num) {
1817 av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
1818 return AVERROR_INVALIDDATA;
1821 ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
1822 if (ctx->time_increment_bits < 1)
1823 ctx->time_increment_bits = 1;
1825 check_marker(s->avctx, gb, "before fixed_vop_rate");
1827 if (get_bits1(gb) != 0) /* fixed_vop_rate */
1828 s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
1830 s->avctx->framerate.den = 1;
1832 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
1836 if (ctx->shape != BIN_ONLY_SHAPE) {
1837 if (ctx->shape == RECT_SHAPE) {
1838 check_marker(s->avctx, gb, "before width");
1839 width = get_bits(gb, 13);
1840 check_marker(s->avctx, gb, "before height");
1841 height = get_bits(gb, 13);
1842 check_marker(s->avctx, gb, "after height");
1843 if (width && height && /* they should be non zero but who knows */
1844 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
1845 if (s->width && s->height &&
1846 (s->width != width || s->height != height))
1847 s->context_reinit = 1;
1853 s->progressive_sequence =
1854 s->progressive_frame = get_bits1(gb) ^ 1;
1855 s->interlaced_dct = 0;
1856 if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
1857 av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
1858 "MPEG-4 OBMC not supported (very likely buggy encoder)\n");
1860 ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
1862 ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
1864 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1865 av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
1866 if (ctx->vol_sprite_usage == STATIC_SPRITE ||
1867 ctx->vol_sprite_usage == GMC_SPRITE) {
1868 if (ctx->vol_sprite_usage == STATIC_SPRITE) {
1869 skip_bits(gb, 13); // sprite_width
1870 check_marker(s->avctx, gb, "after sprite_width");
1871 skip_bits(gb, 13); // sprite_height
1872 check_marker(s->avctx, gb, "after sprite_height");
1873 skip_bits(gb, 13); // sprite_left
1874 check_marker(s->avctx, gb, "after sprite_left");
1875 skip_bits(gb, 13); // sprite_top
1876 check_marker(s->avctx, gb, "after sprite_top");
1878 ctx->num_sprite_warping_points = get_bits(gb, 6);
1879 if (ctx->num_sprite_warping_points > 3) {
1880 av_log(s->avctx, AV_LOG_ERROR,
1881 "%d sprite_warping_points\n",
1882 ctx->num_sprite_warping_points);
1883 ctx->num_sprite_warping_points = 0;
1884 return AVERROR_INVALIDDATA;
1886 s->sprite_warping_accuracy = get_bits(gb, 2);
1887 ctx->sprite_brightness_change = get_bits1(gb);
1888 if (ctx->vol_sprite_usage == STATIC_SPRITE)
1889 skip_bits1(gb); // low_latency_sprite
1891 // FIXME sadct disable bit if verid!=1 && shape not rect
1893 if (get_bits1(gb) == 1) { /* not_8_bit */
1894 s->quant_precision = get_bits(gb, 4); /* quant_precision */
1895 if (get_bits(gb, 4) != 8) /* bits_per_pixel */
1896 av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
1897 if (s->quant_precision != 5)
1898 av_log(s->avctx, AV_LOG_ERROR,
1899 "quant precision %d\n", s->quant_precision);
1900 if (s->quant_precision<3 || s->quant_precision>9) {
1901 s->quant_precision = 5;
1904 s->quant_precision = 5;
1907 // FIXME a bunch of grayscale shape things
1909 if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
1912 /* load default matrixes */
1913 for (i = 0; i < 64; i++) {
1914 int j = s->idsp.idct_permutation[i];
1915 v = ff_mpeg4_default_intra_matrix[i];
1916 s->intra_matrix[j] = v;
1917 s->chroma_intra_matrix[j] = v;
1919 v = ff_mpeg4_default_non_intra_matrix[i];
1920 s->inter_matrix[j] = v;
1921 s->chroma_inter_matrix[j] = v;
1924 /* load custom intra matrix */
1925 if (get_bits1(gb)) {
1927 for (i = 0; i < 64; i++) {
1929 if (get_bits_left(gb) < 8) {
1930 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1931 return AVERROR_INVALIDDATA;
1933 v = get_bits(gb, 8);
1938 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1939 s->intra_matrix[j] = last;
1940 s->chroma_intra_matrix[j] = last;
1943 /* replicate last value */
1944 for (; i < 64; i++) {
1945 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1946 s->intra_matrix[j] = last;
1947 s->chroma_intra_matrix[j] = last;
1951 /* load custom non intra matrix */
1952 if (get_bits1(gb)) {
1954 for (i = 0; i < 64; i++) {
1956 if (get_bits_left(gb) < 8) {
1957 av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
1958 return AVERROR_INVALIDDATA;
1960 v = get_bits(gb, 8);
1965 j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1966 s->inter_matrix[j] = v;
1967 s->chroma_inter_matrix[j] = v;
1970 /* replicate last value */
1971 for (; i < 64; i++) {
1972 int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
1973 s->inter_matrix[j] = last;
1974 s->chroma_inter_matrix[j] = last;
1978 // FIXME a bunch of grayscale shape things
1982 s->quarter_sample = get_bits1(gb);
1984 s->quarter_sample = 0;
1986 if (get_bits_left(gb) < 4) {
1987 av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
1988 return AVERROR_INVALIDDATA;
1991 if (!get_bits1(gb)) {
1992 int pos = get_bits_count(gb);
1993 int estimation_method = get_bits(gb, 2);
1994 if (estimation_method < 2) {
1995 if (!get_bits1(gb)) {
1996 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
1997 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
1998 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
1999 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
2000 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
2001 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
2003 if (!get_bits1(gb)) {
2004 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
2005 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
2006 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
2007 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
2009 if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
2010 skip_bits_long(gb, pos - get_bits_count(gb));
2013 if (!get_bits1(gb)) {
2014 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
2015 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
2016 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
2017 ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
2019 if (!get_bits1(gb)) {
2020 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
2021 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
2022 ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
2023 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
2024 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
2025 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
2027 if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
2028 skip_bits_long(gb, pos - get_bits_count(gb));
2031 if (estimation_method == 1) {
2032 ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
2033 ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
2036 av_log(s->avctx, AV_LOG_ERROR,
2037 "Invalid Complexity estimation method %d\n",
2042 ctx->cplx_estimation_trash_i =
2043 ctx->cplx_estimation_trash_p =
2044 ctx->cplx_estimation_trash_b = 0;
2047 ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
2049 s->data_partitioning = get_bits1(gb);
2050 if (s->data_partitioning)
2051 ctx->rvlc = get_bits1(gb);
2053 if (vo_ver_id != 1) {
2054 ctx->new_pred = get_bits1(gb);
2055 if (ctx->new_pred) {
2056 av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
2057 skip_bits(gb, 2); /* requested upstream message type */
2058 skip_bits1(gb); /* newpred segment type */
2060 if (get_bits1(gb)) // reduced_res_vop
2061 av_log(s->avctx, AV_LOG_ERROR,
2062 "reduced resolution VOP not supported\n");
2067 ctx->scalability = get_bits1(gb);
2069 if (ctx->scalability) {
2070 GetBitContext bak = *gb;
2071 int h_sampling_factor_n;
2072 int h_sampling_factor_m;
2073 int v_sampling_factor_n;
2074 int v_sampling_factor_m;
2076 skip_bits1(gb); // hierarchy_type
2077 skip_bits(gb, 4); /* ref_layer_id */
2078 skip_bits1(gb); /* ref_layer_sampling_dir */
2079 h_sampling_factor_n = get_bits(gb, 5);
2080 h_sampling_factor_m = get_bits(gb, 5);
2081 v_sampling_factor_n = get_bits(gb, 5);
2082 v_sampling_factor_m = get_bits(gb, 5);
2083 ctx->enhancement_type = get_bits1(gb);
2085 if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
2086 v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
2087 /* illegal scalability header (VERY broken encoder),
2088 * trying to workaround */
2089 ctx->scalability = 0;
2092 av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
2094 // bin shape stuff FIXME
2098 if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
2099 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",
2100 s->avctx->framerate.den, s->avctx->framerate.num,
2101 ctx->time_increment_bits,
2103 s->progressive_sequence,
2105 ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
2106 s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
2114 * Decode the user data stuff in the header.
2115 * Also initializes divx/xvid/lavc_version/build.
2117 static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
2119 MpegEncContext *s = &ctx->m;
2123 int ver = 0, build = 0, ver2 = 0, ver3 = 0;
2126 for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
2127 if (show_bits(gb, 23) == 0)
2129 buf[i] = get_bits(gb, 8);
2133 /* divx detection */
2134 e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
2136 e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
2138 ctx->divx_version = ver;
2139 ctx->divx_build = build;
2140 s->divx_packed = e == 3 && last == 'p';
2143 /* libavcodec detection */
2144 e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
2146 e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
2148 e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
2150 build = (ver << 16) + (ver2 << 8) + ver3;
2153 if (strcmp(buf, "ffmpeg") == 0)
2154 ctx->lavc_build = 4600;
2157 ctx->lavc_build = build;
2159 /* Xvid detection */
2160 e = sscanf(buf, "XviD%d", &build);
2162 ctx->xvid_build = build;
2167 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
2169 Mpeg4DecContext *ctx = avctx->priv_data;
2170 MpegEncContext *s = &ctx->m;
2172 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
2173 if (s->codec_tag == AV_RL32("XVID") ||
2174 s->codec_tag == AV_RL32("XVIX") ||
2175 s->codec_tag == AV_RL32("RMP4") ||
2176 s->codec_tag == AV_RL32("ZMP4") ||
2177 s->codec_tag == AV_RL32("SIPP"))
2178 ctx->xvid_build = 0;
2181 if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
2182 if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
2183 ctx->vol_control_parameters == 0)
2184 ctx->divx_version = 400; // divx 4
2186 if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
2188 ctx->divx_build = -1;
2191 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
2192 if (s->codec_tag == AV_RL32("XVIX"))
2193 s->workaround_bugs |= FF_BUG_XVID_ILACE;
2195 if (s->codec_tag == AV_RL32("UMP4"))
2196 s->workaround_bugs |= FF_BUG_UMP4;
2198 if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
2199 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2201 if (ctx->divx_version > 502 && ctx->divx_build < 1814)
2202 s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
2204 if (ctx->xvid_build <= 3U)
2205 s->padding_bug_score = 256 * 256 * 256 * 64;
2207 if (ctx->xvid_build <= 1U)
2208 s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
2210 if (ctx->xvid_build <= 12U)
2211 s->workaround_bugs |= FF_BUG_EDGE;
2213 if (ctx->xvid_build <= 32U)
2214 s->workaround_bugs |= FF_BUG_DC_CLIP;
2216 #define SET_QPEL_FUNC(postfix1, postfix2) \
2217 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
2218 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
2219 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
2221 if (ctx->lavc_build < 4653U)
2222 s->workaround_bugs |= FF_BUG_STD_QPEL;
2224 if (ctx->lavc_build < 4655U)
2225 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2227 if (ctx->lavc_build < 4670U)
2228 s->workaround_bugs |= FF_BUG_EDGE;
2230 if (ctx->lavc_build <= 4712U)
2231 s->workaround_bugs |= FF_BUG_DC_CLIP;
2233 if ((ctx->lavc_build&0xFF) >= 100) {
2234 if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
2235 (ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
2237 s->workaround_bugs |= FF_BUG_IEDGE;
2240 if (ctx->divx_version >= 0)
2241 s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
2242 if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
2243 s->padding_bug_score = 256 * 256 * 256 * 64;
2245 if (ctx->divx_version < 500U)
2246 s->workaround_bugs |= FF_BUG_EDGE;
2248 if (ctx->divx_version >= 0)
2249 s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
2252 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
2253 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
2254 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
2255 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
2256 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
2257 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
2258 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
2260 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
2261 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
2262 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
2263 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
2264 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
2265 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
2268 if (avctx->debug & FF_DEBUG_BUGS)
2269 av_log(s->avctx, AV_LOG_DEBUG,
2270 "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
2271 s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
2272 ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
2274 if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
2275 s->codec_id == AV_CODEC_ID_MPEG4 &&
2276 avctx->idct_algo == FF_IDCT_AUTO) {
2277 avctx->idct_algo = FF_IDCT_XVID;
2278 ff_mpv_idct_init(s);
2285 static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2287 MpegEncContext *s = &ctx->m;
2288 int time_incr, time_increment;
2291 s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
2292 if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
2293 ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
2294 av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
2298 s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
2299 if (s->partitioned_frame)
2300 s->decode_mb = mpeg4_decode_partitioned_mb;
2302 s->decode_mb = mpeg4_decode_mb;
2305 while (get_bits1(gb) != 0)
2308 check_marker(s->avctx, gb, "before time_increment");
2310 if (ctx->time_increment_bits == 0 ||
2311 !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
2312 av_log(s->avctx, AV_LOG_WARNING,
2313 "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);
2315 for (ctx->time_increment_bits = 1;
2316 ctx->time_increment_bits < 16;
2317 ctx->time_increment_bits++) {
2318 if (s->pict_type == AV_PICTURE_TYPE_P ||
2319 (s->pict_type == AV_PICTURE_TYPE_S &&
2320 ctx->vol_sprite_usage == GMC_SPRITE)) {
2321 if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
2323 } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
2327 av_log(s->avctx, AV_LOG_WARNING,
2328 "time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
2329 if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
2330 s->avctx->framerate.num = 1<<ctx->time_increment_bits;
2331 s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
2336 time_increment = get_bits1(gb); // FIXME investigate further
2338 time_increment = get_bits(gb, ctx->time_increment_bits);
2340 if (s->pict_type != AV_PICTURE_TYPE_B) {
2341 s->last_time_base = s->time_base;
2342 s->time_base += time_incr;
2343 s->time = s->time_base * s->avctx->framerate.num + time_increment;
2344 if (s->workaround_bugs & FF_BUG_UMP4) {
2345 if (s->time < s->last_non_b_time) {
2346 /* header is not mpeg-4-compatible, broken encoder,
2347 * trying to workaround */
2349 s->time += s->avctx->framerate.num;
2352 s->pp_time = s->time - s->last_non_b_time;
2353 s->last_non_b_time = s->time;
2355 s->time = (s->last_time_base + time_incr) * s->avctx->framerate.num + time_increment;
2356 s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
2357 if (s->pp_time <= s->pb_time ||
2358 s->pp_time <= s->pp_time - s->pb_time ||
2360 /* messed up order, maybe after seeking? skipping current B-frame */
2361 return FRAME_SKIPPED;
2363 ff_mpeg4_init_direct_mv(s);
2365 if (ctx->t_frame == 0)
2366 ctx->t_frame = s->pb_time;
2367 if (ctx->t_frame == 0)
2368 ctx->t_frame = 1; // 1/0 protection
2369 s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
2370 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2371 s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
2372 ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
2373 if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
2374 s->pb_field_time = 2;
2375 s->pp_field_time = 4;
2376 if (!s->progressive_sequence)
2377 return FRAME_SKIPPED;
2381 if (s->avctx->framerate.den)
2382 pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
2384 pts = AV_NOPTS_VALUE;
2385 ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
2387 check_marker(s->avctx, gb, "before vop_coded");
2390 if (get_bits1(gb) != 1) {
2391 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
2392 av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
2393 return FRAME_SKIPPED;
2396 decode_new_pred(ctx, gb);
2398 if (ctx->shape != BIN_ONLY_SHAPE &&
2399 (s->pict_type == AV_PICTURE_TYPE_P ||
2400 (s->pict_type == AV_PICTURE_TYPE_S &&
2401 ctx->vol_sprite_usage == GMC_SPRITE))) {
2402 /* rounding type for motion estimation */
2403 s->no_rounding = get_bits1(gb);
2407 // FIXME reduced res stuff
2409 if (ctx->shape != RECT_SHAPE) {
2410 if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
2411 skip_bits(gb, 13); /* width */
2412 check_marker(s->avctx, gb, "after width");
2413 skip_bits(gb, 13); /* height */
2414 check_marker(s->avctx, gb, "after height");
2415 skip_bits(gb, 13); /* hor_spat_ref */
2416 check_marker(s->avctx, gb, "after hor_spat_ref");
2417 skip_bits(gb, 13); /* ver_spat_ref */
2419 skip_bits1(gb); /* change_CR_disable */
2421 if (get_bits1(gb) != 0)
2422 skip_bits(gb, 8); /* constant_alpha_value */
2425 // FIXME complexity estimation stuff
2427 if (ctx->shape != BIN_ONLY_SHAPE) {
2428 skip_bits_long(gb, ctx->cplx_estimation_trash_i);
2429 if (s->pict_type != AV_PICTURE_TYPE_I)
2430 skip_bits_long(gb, ctx->cplx_estimation_trash_p);
2431 if (s->pict_type == AV_PICTURE_TYPE_B)
2432 skip_bits_long(gb, ctx->cplx_estimation_trash_b);
2434 if (get_bits_left(gb) < 3) {
2435 av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
2436 return AVERROR_INVALIDDATA;
2438 ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
2439 if (!s->progressive_sequence) {
2440 s->top_field_first = get_bits1(gb);
2441 s->alternate_scan = get_bits1(gb);
2443 s->alternate_scan = 0;
2446 if (s->alternate_scan) {
2447 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
2448 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
2449 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
2450 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2452 ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
2453 ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
2454 ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
2455 ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
2458 if (s->pict_type == AV_PICTURE_TYPE_S) {
2459 if((ctx->vol_sprite_usage == STATIC_SPRITE ||
2460 ctx->vol_sprite_usage == GMC_SPRITE)) {
2461 if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
2462 return AVERROR_INVALIDDATA;
2463 if (ctx->sprite_brightness_change)
2464 av_log(s->avctx, AV_LOG_ERROR,
2465 "sprite_brightness_change not supported\n");
2466 if (ctx->vol_sprite_usage == STATIC_SPRITE)
2467 av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
2469 memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
2470 memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
2474 if (ctx->shape != BIN_ONLY_SHAPE) {
2475 s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
2476 if (s->qscale == 0) {
2477 av_log(s->avctx, AV_LOG_ERROR,
2478 "Error, header damaged or not MPEG-4 header (qscale=0)\n");
2479 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2482 if (s->pict_type != AV_PICTURE_TYPE_I) {
2483 s->f_code = get_bits(gb, 3); /* fcode_for */
2484 if (s->f_code == 0) {
2485 av_log(s->avctx, AV_LOG_ERROR,
2486 "Error, header damaged or not MPEG-4 header (f_code=0)\n");
2488 return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
2493 if (s->pict_type == AV_PICTURE_TYPE_B) {
2494 s->b_code = get_bits(gb, 3);
2495 if (s->b_code == 0) {
2496 av_log(s->avctx, AV_LOG_ERROR,
2497 "Error, header damaged or not MPEG4 header (b_code=0)\n");
2499 return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
2504 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
2505 av_log(s->avctx, AV_LOG_DEBUG,
2506 "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",
2507 s->qscale, s->f_code, s->b_code,
2508 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")),
2509 gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
2510 s->top_field_first, s->quarter_sample ? "q" : "h",
2511 s->data_partitioning, ctx->resync_marker,
2512 ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
2513 1 - s->no_rounding, s->vo_type,
2514 ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
2515 ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
2516 ctx->cplx_estimation_trash_b,
2522 if (!ctx->scalability) {
2523 if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
2524 skip_bits1(gb); // vop shape coding type
2526 if (ctx->enhancement_type) {
2527 int load_backward_shape = get_bits1(gb);
2528 if (load_backward_shape)
2529 av_log(s->avctx, AV_LOG_ERROR,
2530 "load backward shape isn't supported\n");
2532 skip_bits(gb, 2); // ref_select_code
2535 /* detect buggy encoders which don't set the low_delay flag
2536 * (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
2537 * easily (although it's buggy too) */
2538 if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
2539 ctx->divx_version == -1 && s->picture_number == 0) {
2540 av_log(s->avctx, AV_LOG_WARNING,
2541 "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
2545 s->picture_number++; // better than pic number==0 always ;)
2547 // FIXME add short header support
2548 s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
2549 s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
2551 if (s->workaround_bugs & FF_BUG_EDGE) {
2552 s->h_edge_pos = s->width;
2553 s->v_edge_pos = s->height;
2559 * Decode MPEG-4 headers.
2560 * @return <0 if no VOP found (or a damaged one)
2561 * FRAME_SKIPPED if a not coded VOP is found
2562 * 0 if a VOP is found
2564 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
2566 MpegEncContext *s = &ctx->m;
2567 unsigned startcode, v;
2571 /* search next start code */
2574 if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
2576 if (get_bits(gb, 8) == 0xF0)
2582 if (get_bits_count(gb) >= gb->size_in_bits) {
2583 if (gb->size_in_bits == 8 &&
2584 (ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
2585 av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
2586 return FRAME_SKIPPED; // divx bug
2588 return -1; // end of stream
2591 /* use the bits after the test */
2592 v = get_bits(gb, 8);
2593 startcode = ((startcode << 8) | v) & 0xffffffff;
2595 if ((startcode & 0xFFFFFF00) != 0x100)
2596 continue; // no startcode
2598 if (s->avctx->debug & FF_DEBUG_STARTCODE) {
2599 av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
2600 if (startcode <= 0x11F)
2601 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
2602 else if (startcode <= 0x12F)
2603 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
2604 else if (startcode <= 0x13F)
2605 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2606 else if (startcode <= 0x15F)
2607 av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
2608 else if (startcode <= 0x1AF)
2609 av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
2610 else if (startcode == 0x1B0)
2611 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
2612 else if (startcode == 0x1B1)
2613 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
2614 else if (startcode == 0x1B2)
2615 av_log(s->avctx, AV_LOG_DEBUG, "User Data");
2616 else if (startcode == 0x1B3)
2617 av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
2618 else if (startcode == 0x1B4)
2619 av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
2620 else if (startcode == 0x1B5)
2621 av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
2622 else if (startcode == 0x1B6)
2623 av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
2624 else if (startcode == 0x1B7)
2625 av_log(s->avctx, AV_LOG_DEBUG, "slice start");
2626 else if (startcode == 0x1B8)
2627 av_log(s->avctx, AV_LOG_DEBUG, "extension start");
2628 else if (startcode == 0x1B9)
2629 av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
2630 else if (startcode == 0x1BA)
2631 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
2632 else if (startcode == 0x1BB)
2633 av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
2634 else if (startcode == 0x1BC)
2635 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
2636 else if (startcode == 0x1BD)
2637 av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
2638 else if (startcode == 0x1BE)
2639 av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
2640 else if (startcode == 0x1BF)
2641 av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
2642 else if (startcode == 0x1C0)
2643 av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
2644 else if (startcode == 0x1C1)
2645 av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
2646 else if (startcode == 0x1C2)
2647 av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
2648 else if (startcode == 0x1C3)
2649 av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
2650 else if (startcode <= 0x1C5)
2651 av_log(s->avctx, AV_LOG_DEBUG, "reserved");
2652 else if (startcode <= 0x1FF)
2653 av_log(s->avctx, AV_LOG_DEBUG, "System start");
2654 av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
2657 if (startcode >= 0x120 && startcode <= 0x12F) {
2659 av_log(s->avctx, AV_LOG_ERROR, "Multiple VOL headers");
2660 return AVERROR_INVALIDDATA;
2663 if ((ret = decode_vol_header(ctx, gb)) < 0)
2665 } else if (startcode == USER_DATA_STARTCODE) {
2666 decode_user_data(ctx, gb);
2667 } else if (startcode == GOP_STARTCODE) {
2668 mpeg4_decode_gop_header(s, gb);
2669 } else if (startcode == VOS_STARTCODE) {
2670 mpeg4_decode_profile_level(s, gb);
2671 } else if (startcode == VOP_STARTCODE) {
2680 if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
2682 s->avctx->has_b_frames = !s->low_delay;
2684 return decode_vop_header(ctx, gb);
2687 av_cold void ff_mpeg4videodec_static_init(void) {
2688 static int done = 0;
2691 ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
2692 ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
2693 ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
2694 INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
2695 INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
2696 INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
2697 INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
2698 &ff_mpeg4_DCtab_lum[0][1], 2, 1,
2699 &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
2700 INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
2701 &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
2702 &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
2703 INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
2704 &ff_sprite_trajectory_tab[0][1], 4, 2,
2705 &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
2706 INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
2707 &ff_mb_type_b_tab[0][1], 2, 1,
2708 &ff_mb_type_b_tab[0][0], 2, 1, 16);
2713 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
2715 Mpeg4DecContext *ctx = avctx->priv_data;
2716 MpegEncContext *s = &ctx->m;
2718 /* divx 5.01+ bitstream reorder stuff */
2719 /* Since this clobbers the input buffer and hwaccel codecs still need the
2720 * data during hwaccel->end_frame we should not do this any earlier */
2721 if (s->divx_packed) {
2722 int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
2723 int startcode_found = 0;
2725 if (buf_size - current_pos > 7) {
2728 for (i = current_pos; i < buf_size - 4; i++)
2733 buf[i + 3] == 0xB6) {
2734 startcode_found = !(buf[i + 4] & 0x40);
2739 if (startcode_found) {
2740 if (!ctx->showed_packed_warning) {
2741 av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
2742 "wasteful way to store B-frames ('packed B-frames'). "
2743 "Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
2744 ctx->showed_packed_warning = 1;
2746 av_fast_padded_malloc(&s->bitstream_buffer,
2747 &s->allocated_bitstream_buffer_size,
2748 buf_size - current_pos);
2749 if (!s->bitstream_buffer) {
2750 s->bitstream_buffer_size = 0;
2751 return AVERROR(ENOMEM);
2753 memcpy(s->bitstream_buffer, buf + current_pos,
2754 buf_size - current_pos);
2755 s->bitstream_buffer_size = buf_size - current_pos;
2763 static int mpeg4_update_thread_context(AVCodecContext *dst,
2764 const AVCodecContext *src)
2766 Mpeg4DecContext *s = dst->priv_data;
2767 const Mpeg4DecContext *s1 = src->priv_data;
2768 int init = s->m.context_initialized;
2770 int ret = ff_mpeg_update_thread_context(dst, src);
2775 memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
2777 if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
2778 ff_xvid_idct_init(&s->m.idsp, dst);
2784 static av_cold int decode_init(AVCodecContext *avctx)
2786 Mpeg4DecContext *ctx = avctx->priv_data;
2787 MpegEncContext *s = &ctx->m;
2793 ctx->lavc_build = -1;
2795 if ((ret = ff_h263_decode_init(avctx)) < 0)
2798 ff_mpeg4videodec_static_init();
2801 s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
2802 s->decode_mb = mpeg4_decode_mb;
2803 ctx->time_increment_bits = 4; /* default value for broken headers */
2805 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
2806 avctx->internal->allocate_progress = 1;
2811 static const AVOption mpeg4_options[] = {
2812 {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2813 {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
2817 static const AVClass mpeg4_class = {
2818 "MPEG4 Video Decoder",
2819 av_default_item_name,
2821 LIBAVUTIL_VERSION_INT,
2824 AVCodec ff_mpeg4_decoder = {
2826 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
2827 .type = AVMEDIA_TYPE_VIDEO,
2828 .id = AV_CODEC_ID_MPEG4,
2829 .priv_data_size = sizeof(Mpeg4DecContext),
2830 .init = decode_init,
2831 .close = ff_h263_decode_end,
2832 .decode = ff_h263_decode_frame,
2833 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
2834 AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2835 AV_CODEC_CAP_FRAME_THREADS,
2836 .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
2837 .flush = ff_mpeg_flush,
2839 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
2840 .profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
2841 .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
2842 .priv_class = &mpeg4_class,
2846 #if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
2847 static const AVClass mpeg4_vdpau_class = {
2848 "MPEG4 Video VDPAU Decoder",
2849 av_default_item_name,
2851 LIBAVUTIL_VERSION_INT,
2854 AVCodec ff_mpeg4_vdpau_decoder = {
2855 .name = "mpeg4_vdpau",
2856 .long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
2857 .type = AVMEDIA_TYPE_VIDEO,
2858 .id = AV_CODEC_ID_MPEG4,
2859 .priv_data_size = sizeof(Mpeg4DecContext),
2860 .init = decode_init,
2861 .close = ff_h263_decode_end,
2862 .decode = ff_h263_decode_frame,
2863 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
2864 AV_CODEC_CAP_HWACCEL_VDPAU,
2865 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
2867 .priv_class = &mpeg4_vdpau_class,