3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/cpu.h"
30 #include "error_resilience.h"
33 #include "h263_parser.h"
35 #include "mpeg4video.h"
36 #include "mpeg4video_parser.h"
37 #include "mpegvideo.h"
41 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
43 MpegEncContext *s = avctx->priv_data;
47 s->out_format = FMT_H263;
48 s->width = avctx->coded_width;
49 s->height = avctx->coded_height;
50 s->workaround_bugs = avctx->workaround_bugs;
53 ff_MPV_decode_defaults(s);
54 s->quant_precision = 5;
55 s->decode_mb = ff_h263_decode_mb;
57 if (avctx->codec->id == AV_CODEC_ID_MSS2)
58 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
60 avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
61 s->unrestricted_mv = 1;
63 /* select sub codec */
64 switch (avctx->codec->id) {
65 case AV_CODEC_ID_H263:
66 s->unrestricted_mv = 0;
67 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
69 case AV_CODEC_ID_MPEG4:
71 case AV_CODEC_ID_MSMPEG4V1:
73 s->msmpeg4_version = 1;
75 case AV_CODEC_ID_MSMPEG4V2:
77 s->msmpeg4_version = 2;
79 case AV_CODEC_ID_MSMPEG4V3:
81 s->msmpeg4_version = 3;
83 case AV_CODEC_ID_WMV1:
85 s->msmpeg4_version = 4;
87 case AV_CODEC_ID_WMV2:
89 s->msmpeg4_version = 5;
92 case AV_CODEC_ID_WMV3:
93 case AV_CODEC_ID_VC1IMAGE:
94 case AV_CODEC_ID_WMV3IMAGE:
95 case AV_CODEC_ID_MSS2:
97 s->msmpeg4_version = 6;
98 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
100 case AV_CODEC_ID_H263I:
102 case AV_CODEC_ID_FLV1:
106 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
108 return AVERROR(ENOSYS);
110 s->codec_id = avctx->codec->id;
112 /* for h263, we allocate the images after having read the header */
113 if (avctx->codec->id != AV_CODEC_ID_H263 &&
114 avctx->codec->id != AV_CODEC_ID_MPEG4)
115 if ((ret = ff_MPV_common_init(s)) < 0)
118 ff_h263dsp_init(&s->h263dsp);
119 ff_h263_decode_init_vlc();
124 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
126 MpegEncContext *s = avctx->priv_data;
128 ff_MPV_common_end(s);
133 * Return the number of bytes consumed for building the current frame.
135 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
137 int pos = (get_bits_count(&s->gb) + 7) >> 3;
139 if (s->divx_packed || s->avctx->hwaccel) {
140 /* We would have to scan through the whole buf to handle the weird
143 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
144 pos -= s->parse_context.last_index;
145 // padding is not really read so this might be -1
150 // avoid infinite loops (maybe not needed...)
154 if (pos + 10 > buf_size)
161 static int decode_slice(MpegEncContext *s)
163 const int part_mask = s->partitioned_frame
164 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
165 const int mb_size = 16;
168 s->last_resync_gb = s->gb;
169 s->first_slice_line = 1;
170 s->resync_mb_x = s->mb_x;
171 s->resync_mb_y = s->mb_y;
173 ff_set_qscale(s, s->qscale);
175 if (s->avctx->hwaccel) {
176 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
177 const uint8_t *end = ff_h263_find_resync_marker(start + 1,
179 skip_bits_long(&s->gb, 8 * (end - start));
180 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
183 if (s->partitioned_frame) {
184 const int qscale = s->qscale;
186 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
187 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
190 /* restore variables which were modified */
191 s->first_slice_line = 1;
192 s->mb_x = s->resync_mb_x;
193 s->mb_y = s->resync_mb_y;
194 ff_set_qscale(s, qscale);
197 for (; s->mb_y < s->mb_height; s->mb_y++) {
198 /* per-row end of slice checks */
199 if (s->msmpeg4_version) {
200 if (s->resync_mb_y + s->slice_height == s->mb_y) {
201 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
202 s->mb_x - 1, s->mb_y, ER_MB_END);
208 if (s->msmpeg4_version == 1) {
214 ff_init_block_index(s);
215 for (; s->mb_x < s->mb_width; s->mb_x++) {
218 ff_update_block_index(s);
220 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
221 s->first_slice_line = 0;
225 s->mv_dir = MV_DIR_FORWARD;
226 s->mv_type = MV_TYPE_16X16;
227 av_dlog(s, "%d %d %06X\n",
228 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
229 ret = s->decode_mb(s, s->block);
231 if (s->pict_type != AV_PICTURE_TYPE_B)
232 ff_h263_update_motion_val(s);
235 const int xy = s->mb_x + s->mb_y * s->mb_stride;
236 if (ret == SLICE_END) {
237 ff_MPV_decode_mb(s, s->block);
239 ff_h263_loop_filter(s);
241 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
242 s->mb_x, s->mb_y, ER_MB_END & part_mask);
244 s->padding_bug_score--;
246 if (++s->mb_x >= s->mb_width) {
248 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
249 ff_MPV_report_decode_progress(s);
253 } else if (ret == SLICE_NOEND) {
254 av_log(s->avctx, AV_LOG_ERROR,
255 "Slice mismatch at MB: %d\n", xy);
256 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
257 s->mb_x + 1, s->mb_y,
258 ER_MB_END & part_mask);
259 return AVERROR_INVALIDDATA;
261 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
262 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
263 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
265 return AVERROR_INVALIDDATA;
268 ff_MPV_decode_mb(s, s->block);
270 ff_h263_loop_filter(s);
273 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
274 ff_MPV_report_decode_progress(s);
279 assert(s->mb_x == 0 && s->mb_y == s->mb_height);
281 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
282 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
283 get_bits_left(&s->gb) >= 48 &&
284 show_bits(&s->gb, 24) == 0x4010 &&
285 !s->data_partitioning)
286 s->padding_bug_score += 32;
288 /* try to detect the padding bug */
289 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
290 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
291 get_bits_left(&s->gb) >= 0 &&
292 get_bits_left(&s->gb) < 48 &&
293 !s->data_partitioning) {
294 const int bits_count = get_bits_count(&s->gb);
295 const int bits_left = s->gb.size_in_bits - bits_count;
297 if (bits_left == 0) {
298 s->padding_bug_score += 16;
299 } else if (bits_left != 1) {
300 int v = show_bits(&s->gb, 8);
301 v |= 0x7F >> (7 - (bits_count & 7));
303 if (v == 0x7F && bits_left <= 8)
304 s->padding_bug_score--;
305 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
307 s->padding_bug_score += 4;
309 s->padding_bug_score++;
313 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
314 if (s->padding_bug_score > -2 && !s->data_partitioning)
315 s->workaround_bugs |= FF_BUG_NO_PADDING;
317 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
320 // handle formats which don't have unique end markers
321 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
322 int left = get_bits_left(&s->gb);
325 /* no markers in M$ crap */
326 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
329 /* buggy padding but the frame should still end approximately at
330 * the bitstream end */
331 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
332 (s->err_recognition & AV_EF_BUFFER))
334 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
335 max_extra += 256 * 256 * 256 * 64;
337 if (left > max_extra)
338 av_log(s->avctx, AV_LOG_ERROR,
339 "discarding %d junk bits at end, next would be %X\n",
340 left, show_bits(&s->gb, 24));
342 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
344 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
345 s->mb_x - 1, s->mb_y, ER_MB_END);
350 av_log(s->avctx, AV_LOG_ERROR,
351 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
352 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
354 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
355 ER_MB_END & part_mask);
357 return AVERROR_INVALIDDATA;
360 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
363 const uint8_t *buf = avpkt->data;
364 int buf_size = avpkt->size;
365 MpegEncContext *s = avctx->priv_data;
367 AVFrame *pict = data;
369 s->flags = avctx->flags;
370 s->flags2 = avctx->flags2;
372 /* no supplementary picture */
374 /* special case for last picture */
375 if (s->low_delay == 0 && s->next_picture_ptr) {
376 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
378 s->next_picture_ptr = NULL;
386 if (s->flags & CODEC_FLAG_TRUNCATED) {
389 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
390 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
391 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
392 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
394 av_log(s->avctx, AV_LOG_ERROR,
395 "this codec does not support truncated bitstreams\n");
396 return AVERROR(ENOSYS);
399 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
404 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
405 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
406 s->bitstream_buffer_size);
408 ret = init_get_bits8(&s->gb, buf, buf_size);
409 s->bitstream_buffer_size = 0;
414 if (!s->context_initialized)
415 // we need the idct permutaton for reading a custom matrix
416 if ((ret = ff_MPV_common_init(s)) < 0)
419 /* We need to set current_picture_ptr before reading the header,
420 * otherwise we cannot store anyting in there */
421 if (s->current_picture_ptr == NULL || s->current_picture_ptr->f->data[0]) {
422 int i = ff_find_unused_picture(s, 0);
425 s->current_picture_ptr = &s->picture[i];
429 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
430 ret = ff_wmv2_decode_picture_header(s);
431 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
432 ret = ff_msmpeg4_decode_picture_header(s);
433 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
434 if (s->avctx->extradata_size && s->picture_number == 0) {
437 ret = init_get_bits8(&gb, s->avctx->extradata,
438 s->avctx->extradata_size);
441 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
443 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
444 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
445 ret = ff_intel_h263_decode_picture_header(s);
446 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
447 ret = ff_flv_decode_picture_header(s);
449 ret = ff_h263_decode_picture_header(s);
452 if (ret == FRAME_SKIPPED)
453 return get_consumed_bytes(s, buf_size);
455 /* skip if the header was thrashed */
457 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
461 avctx->has_b_frames = !s->low_delay;
463 #define SET_QPEL_FUNC(postfix1, postfix2) \
464 s->dsp.put_ ## postfix1 = ff_put_ ## postfix2; \
465 s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
466 s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
468 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
469 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
470 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
471 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
472 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
473 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
474 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
476 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
477 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
478 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
479 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
480 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
481 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
484 /* After H263 & mpeg4 header decode we have the height, width,
485 * and other parameters. So then we could init the picture.
486 * FIXME: By the way H263 decoder is evolving it should have
487 * an H263EncContext */
488 if (s->width != avctx->coded_width ||
489 s->height != avctx->coded_height ||
491 /* H.263 could change picture size any time */
492 s->context_reinit = 0;
494 ret = ff_set_dimensions(avctx, s->width, s->height);
498 if ((ret = ff_MPV_common_frame_size_change(s)))
502 if (s->codec_id == AV_CODEC_ID_H263 ||
503 s->codec_id == AV_CODEC_ID_H263P ||
504 s->codec_id == AV_CODEC_ID_H263I)
505 s->gob_index = ff_h263_get_gob_height(s);
507 // for skipping the frame
508 s->current_picture.f->pict_type = s->pict_type;
509 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
511 /* skip B-frames if we don't have reference frames */
512 if (s->last_picture_ptr == NULL &&
513 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
514 return get_consumed_bytes(s, buf_size);
515 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
516 s->pict_type == AV_PICTURE_TYPE_B) ||
517 (avctx->skip_frame >= AVDISCARD_NONKEY &&
518 s->pict_type != AV_PICTURE_TYPE_I) ||
519 avctx->skip_frame >= AVDISCARD_ALL)
520 return get_consumed_bytes(s, buf_size);
522 if (s->next_p_frame_damaged) {
523 if (s->pict_type == AV_PICTURE_TYPE_B)
524 return get_consumed_bytes(s, buf_size);
526 s->next_p_frame_damaged = 0;
529 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
530 s->me.qpel_put = s->dsp.put_qpel_pixels_tab;
531 s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
533 s->me.qpel_put = s->dsp.put_no_rnd_qpel_pixels_tab;
534 s->me.qpel_avg = s->dsp.avg_qpel_pixels_tab;
537 if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
540 if (!s->divx_packed && !avctx->hwaccel)
541 ff_thread_finish_setup(avctx);
543 if (avctx->hwaccel) {
544 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
545 s->gb.buffer_end - s->gb.buffer);
550 ff_mpeg_er_frame_start(s);
552 /* the second part of the wmv2 header contains the MB skip bits which
553 * are stored in current_picture->mb_type which is not available before
554 * ff_MPV_frame_start() */
555 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
556 ret = ff_wmv2_decode_secondary_picture_header(s);
560 goto intrax8_decoded;
563 /* decode each macroblock */
567 ret = decode_slice(s);
568 while (s->mb_y < s->mb_height) {
569 if (s->msmpeg4_version) {
570 if (s->slice_height == 0 || s->mb_x != 0 ||
571 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
574 int prev_x = s->mb_x, prev_y = s->mb_y;
575 if (ff_h263_resync(s) < 0)
577 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
578 s->er.error_occurred = 1;
581 if (s->msmpeg4_version < 4 && s->h263_pred)
582 ff_mpeg4_clean_buffers(s);
584 if (decode_slice(s) < 0)
585 ret = AVERROR_INVALIDDATA;
588 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
589 s->pict_type == AV_PICTURE_TYPE_I)
590 if (!CONFIG_MSMPEG4_DECODER ||
591 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
592 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
594 assert(s->bitstream_buffer_size == 0);
596 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
597 ff_mpeg4_frame_end(avctx, buf, buf_size);
600 ff_er_frame_end(&s->er);
602 if (avctx->hwaccel) {
603 ret = avctx->hwaccel->end_frame(avctx);
610 if (!s->divx_packed && avctx->hwaccel)
611 ff_thread_finish_setup(avctx);
613 assert(s->current_picture.f->pict_type ==
614 s->current_picture_ptr->f->pict_type);
615 assert(s->current_picture.f->pict_type == s->pict_type);
616 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
617 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
619 ff_print_debug_info(s, s->current_picture_ptr);
620 } else if (s->last_picture_ptr != NULL) {
621 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
623 ff_print_debug_info(s, s->last_picture_ptr);
626 if (s->last_picture_ptr || s->low_delay)
629 if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
632 return get_consumed_bytes(s, buf_size);
635 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
636 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
637 AV_PIX_FMT_VAAPI_VLD,
639 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
646 AVCodec ff_h263_decoder = {
648 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
649 .type = AVMEDIA_TYPE_VIDEO,
650 .id = AV_CODEC_ID_H263,
651 .priv_data_size = sizeof(MpegEncContext),
652 .init = ff_h263_decode_init,
653 .close = ff_h263_decode_end,
654 .decode = ff_h263_decode_frame,
655 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
656 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
657 .flush = ff_mpeg_flush,
658 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,