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"
36 #include "mpeg4video.h"
37 #include "mpeg4video_parser.h"
38 #include "mpegvideo.h"
43 static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
45 if (avctx->codec->id == AV_CODEC_ID_MSS2)
46 return AV_PIX_FMT_YUV420P;
48 return avctx->pix_fmt = ff_get_format(avctx, avctx->codec->pix_fmts);
51 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
53 MpegEncContext *s = avctx->priv_data;
57 s->out_format = FMT_H263;
58 s->width = avctx->coded_width;
59 s->height = avctx->coded_height;
60 s->workaround_bugs = avctx->workaround_bugs;
63 ff_mpv_decode_defaults(s);
64 s->quant_precision = 5;
65 s->decode_mb = ff_h263_decode_mb;
67 s->unrestricted_mv = 1;
69 /* select sub codec */
70 switch (avctx->codec->id) {
71 case AV_CODEC_ID_H263:
72 s->unrestricted_mv = 0;
73 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
75 case AV_CODEC_ID_MPEG4:
77 case AV_CODEC_ID_MSMPEG4V1:
79 s->msmpeg4_version = 1;
81 case AV_CODEC_ID_MSMPEG4V2:
83 s->msmpeg4_version = 2;
85 case AV_CODEC_ID_MSMPEG4V3:
87 s->msmpeg4_version = 3;
89 case AV_CODEC_ID_WMV1:
91 s->msmpeg4_version = 4;
93 case AV_CODEC_ID_WMV2:
95 s->msmpeg4_version = 5;
98 case AV_CODEC_ID_WMV3:
99 case AV_CODEC_ID_VC1IMAGE:
100 case AV_CODEC_ID_WMV3IMAGE:
101 case AV_CODEC_ID_MSS2:
103 s->msmpeg4_version = 6;
104 avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
106 case AV_CODEC_ID_H263I:
108 case AV_CODEC_ID_FLV1:
112 av_log(avctx, AV_LOG_ERROR, "Unsupported codec %d\n",
114 return AVERROR(ENOSYS);
116 s->codec_id = avctx->codec->id;
118 /* for h263, we allocate the images after having read the header */
119 if (avctx->codec->id != AV_CODEC_ID_H263 &&
120 avctx->codec->id != AV_CODEC_ID_MPEG4) {
121 avctx->pix_fmt = h263_get_format(avctx);
123 if ((ret = ff_mpv_common_init(s)) < 0)
127 ff_h263dsp_init(&s->h263dsp);
128 ff_qpeldsp_init(&s->qdsp);
129 ff_h263_decode_init_vlc();
134 av_cold int ff_h263_decode_end(AVCodecContext *avctx)
136 MpegEncContext *s = avctx->priv_data;
138 ff_mpv_common_end(s);
143 * Return the number of bytes consumed for building the current frame.
145 static int get_consumed_bytes(MpegEncContext *s, int buf_size)
147 int pos = (get_bits_count(&s->gb) + 7) >> 3;
149 if (s->divx_packed || s->avctx->hwaccel) {
150 /* We would have to scan through the whole buf to handle the weird
153 } else if (s->flags & CODEC_FLAG_TRUNCATED) {
154 pos -= s->parse_context.last_index;
155 // padding is not really read so this might be -1
160 // avoid infinite loops (maybe not needed...)
164 if (pos + 10 > buf_size)
171 static int decode_slice(MpegEncContext *s)
173 const int part_mask = s->partitioned_frame
174 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
175 const int mb_size = 16;
178 s->last_resync_gb = s->gb;
179 s->first_slice_line = 1;
180 s->resync_mb_x = s->mb_x;
181 s->resync_mb_y = s->mb_y;
183 ff_set_qscale(s, s->qscale);
185 if (s->avctx->hwaccel) {
186 const uint8_t *start = s->gb.buffer + get_bits_count(&s->gb) / 8;
187 const uint8_t *end = ff_h263_find_resync_marker(start + 1,
189 skip_bits_long(&s->gb, 8 * (end - start));
190 return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
193 if (s->partitioned_frame) {
194 const int qscale = s->qscale;
196 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4)
197 if ((ret = ff_mpeg4_decode_partitions(s->avctx->priv_data)) < 0)
200 /* restore variables which were modified */
201 s->first_slice_line = 1;
202 s->mb_x = s->resync_mb_x;
203 s->mb_y = s->resync_mb_y;
204 ff_set_qscale(s, qscale);
207 for (; s->mb_y < s->mb_height; s->mb_y++) {
208 /* per-row end of slice checks */
209 if (s->msmpeg4_version) {
210 if (s->resync_mb_y + s->slice_height == s->mb_y) {
211 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
212 s->mb_x - 1, s->mb_y, ER_MB_END);
218 if (s->msmpeg4_version == 1) {
224 ff_init_block_index(s);
225 for (; s->mb_x < s->mb_width; s->mb_x++) {
228 ff_update_block_index(s);
230 if (s->resync_mb_x == s->mb_x && s->resync_mb_y + 1 == s->mb_y)
231 s->first_slice_line = 0;
235 s->mv_dir = MV_DIR_FORWARD;
236 s->mv_type = MV_TYPE_16X16;
237 ff_dlog(s, "%d %d %06X\n",
238 ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
239 ret = s->decode_mb(s, s->block);
241 if (s->pict_type != AV_PICTURE_TYPE_B)
242 ff_h263_update_motion_val(s);
245 const int xy = s->mb_x + s->mb_y * s->mb_stride;
246 if (ret == SLICE_END) {
247 ff_mpv_decode_mb(s, s->block);
249 ff_h263_loop_filter(s);
251 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
252 s->mb_x, s->mb_y, ER_MB_END & part_mask);
254 s->padding_bug_score--;
256 if (++s->mb_x >= s->mb_width) {
258 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
259 ff_mpv_report_decode_progress(s);
263 } else if (ret == SLICE_NOEND) {
264 av_log(s->avctx, AV_LOG_ERROR,
265 "Slice mismatch at MB: %d\n", xy);
266 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
267 s->mb_x + 1, s->mb_y,
268 ER_MB_END & part_mask);
269 return AVERROR_INVALIDDATA;
271 av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
272 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
273 s->mb_x, s->mb_y, ER_MB_ERROR & part_mask);
275 return AVERROR_INVALIDDATA;
278 ff_mpv_decode_mb(s, s->block);
280 ff_h263_loop_filter(s);
283 ff_mpeg_draw_horiz_band(s, s->mb_y * mb_size, mb_size);
284 ff_mpv_report_decode_progress(s);
289 assert(s->mb_x == 0 && s->mb_y == s->mb_height);
291 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
292 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
293 get_bits_left(&s->gb) >= 48 &&
294 show_bits(&s->gb, 24) == 0x4010 &&
295 !s->data_partitioning)
296 s->padding_bug_score += 32;
298 /* try to detect the padding bug */
299 if (s->codec_id == AV_CODEC_ID_MPEG4 &&
300 (s->workaround_bugs & FF_BUG_AUTODETECT) &&
301 get_bits_left(&s->gb) >= 0 &&
302 get_bits_left(&s->gb) < 48 &&
303 !s->data_partitioning) {
304 const int bits_count = get_bits_count(&s->gb);
305 const int bits_left = s->gb.size_in_bits - bits_count;
307 if (bits_left == 0) {
308 s->padding_bug_score += 16;
309 } else if (bits_left != 1) {
310 int v = show_bits(&s->gb, 8);
311 v |= 0x7F >> (7 - (bits_count & 7));
313 if (v == 0x7F && bits_left <= 8)
314 s->padding_bug_score--;
315 else if (v == 0x7F && ((get_bits_count(&s->gb) + 8) & 8) &&
317 s->padding_bug_score += 4;
319 s->padding_bug_score++;
323 if (s->workaround_bugs & FF_BUG_AUTODETECT) {
324 if (s->codec_id == AV_CODEC_ID_H263 ||
325 (s->padding_bug_score > -2 && !s->data_partitioning))
326 s->workaround_bugs |= FF_BUG_NO_PADDING;
328 s->workaround_bugs &= ~FF_BUG_NO_PADDING;
331 // handle formats which don't have unique end markers
332 if (s->msmpeg4_version || (s->workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
333 int left = get_bits_left(&s->gb);
336 /* no markers in M$ crap */
337 if (s->msmpeg4_version && s->pict_type == AV_PICTURE_TYPE_I)
340 /* buggy padding but the frame should still end approximately at
341 * the bitstream end */
342 if ((s->workaround_bugs & FF_BUG_NO_PADDING) &&
343 (s->err_recognition & AV_EF_BUFFER))
345 else if ((s->workaround_bugs & FF_BUG_NO_PADDING))
346 max_extra += 256 * 256 * 256 * 64;
348 if (left > max_extra)
349 av_log(s->avctx, AV_LOG_ERROR,
350 "discarding %d junk bits at end, next would be %X\n",
351 left, show_bits(&s->gb, 24));
353 av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
355 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
356 s->mb_x - 1, s->mb_y, ER_MB_END);
361 av_log(s->avctx, AV_LOG_ERROR,
362 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
363 get_bits_left(&s->gb), show_bits(&s->gb, 24), s->padding_bug_score);
365 ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
366 ER_MB_END & part_mask);
368 return AVERROR_INVALIDDATA;
371 int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
374 const uint8_t *buf = avpkt->data;
375 int buf_size = avpkt->size;
376 MpegEncContext *s = avctx->priv_data;
378 AVFrame *pict = data;
380 s->flags = avctx->flags;
381 s->flags2 = avctx->flags2;
383 /* no supplementary picture */
385 /* special case for last picture */
386 if (s->low_delay == 0 && s->next_picture_ptr) {
387 if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
389 s->next_picture_ptr = NULL;
397 if (s->flags & CODEC_FLAG_TRUNCATED) {
400 if (CONFIG_MPEG4_DECODER && s->codec_id == AV_CODEC_ID_MPEG4) {
401 next = ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
402 } else if (CONFIG_H263_DECODER && s->codec_id == AV_CODEC_ID_H263) {
403 next = ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
405 av_log(s->avctx, AV_LOG_ERROR,
406 "this codec does not support truncated bitstreams\n");
407 return AVERROR(ENOSYS);
410 if (ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf,
415 if (s->bitstream_buffer_size && (s->divx_packed || buf_size < 20)) // divx 5.01+/xvid frame reorder
416 ret = init_get_bits8(&s->gb, s->bitstream_buffer,
417 s->bitstream_buffer_size);
419 ret = init_get_bits8(&s->gb, buf, buf_size);
420 s->bitstream_buffer_size = 0;
425 if (!s->context_initialized)
426 // we need the idct permutaton for reading a custom matrix
430 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
431 ret = ff_wmv2_decode_picture_header(s);
432 } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
433 ret = ff_msmpeg4_decode_picture_header(s);
434 } else if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
435 if (s->avctx->extradata_size && s->picture_number == 0) {
438 ret = init_get_bits8(&gb, s->avctx->extradata,
439 s->avctx->extradata_size);
442 ff_mpeg4_decode_picture_header(avctx->priv_data, &gb);
444 ret = ff_mpeg4_decode_picture_header(avctx->priv_data, &s->gb);
445 } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
446 ret = ff_intel_h263_decode_picture_header(s);
447 } else if (CONFIG_FLV_DECODER && s->h263_flv) {
448 ret = ff_flv_decode_picture_header(s);
450 ret = ff_h263_decode_picture_header(s);
453 if (ret == FRAME_SKIPPED)
454 return get_consumed_bytes(s, buf_size);
456 /* skip if the header was thrashed */
458 av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
462 if (!s->context_initialized) {
463 avctx->pix_fmt = h263_get_format(avctx);
464 if ((ret = ff_mpv_common_init(s)) < 0)
468 if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
469 int i = ff_find_unused_picture(s, 0);
472 s->current_picture_ptr = &s->picture[i];
475 avctx->has_b_frames = !s->low_delay;
477 #define SET_QPEL_FUNC(postfix1, postfix2) \
478 s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
479 s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
480 s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
482 if (s->workaround_bugs & FF_BUG_STD_QPEL) {
483 SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
484 SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
485 SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
486 SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
487 SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
488 SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
490 SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
491 SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
492 SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
493 SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
494 SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
495 SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
498 /* After H263 & mpeg4 header decode we have the height, width,
499 * and other parameters. So then we could init the picture.
500 * FIXME: By the way H263 decoder is evolving it should have
501 * an H263EncContext */
502 if (s->width != avctx->coded_width ||
503 s->height != avctx->coded_height ||
505 /* H.263 could change picture size any time */
506 s->context_reinit = 0;
508 ret = ff_set_dimensions(avctx, s->width, s->height);
512 ff_set_sar(avctx, avctx->sample_aspect_ratio);
514 if ((ret = ff_mpv_common_frame_size_change(s)))
517 if (avctx->pix_fmt != h263_get_format(avctx)) {
518 av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
519 avctx->pix_fmt = AV_PIX_FMT_NONE;
520 return AVERROR_UNKNOWN;
524 if (s->codec_id == AV_CODEC_ID_H263 ||
525 s->codec_id == AV_CODEC_ID_H263P ||
526 s->codec_id == AV_CODEC_ID_H263I)
527 s->gob_index = H263_GOB_HEIGHT(s->height);
529 // for skipping the frame
530 s->current_picture.f->pict_type = s->pict_type;
531 s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
533 /* skip B-frames if we don't have reference frames */
534 if (!s->last_picture_ptr &&
535 (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
536 return get_consumed_bytes(s, buf_size);
537 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
538 s->pict_type == AV_PICTURE_TYPE_B) ||
539 (avctx->skip_frame >= AVDISCARD_NONKEY &&
540 s->pict_type != AV_PICTURE_TYPE_I) ||
541 avctx->skip_frame >= AVDISCARD_ALL)
542 return get_consumed_bytes(s, buf_size);
544 if (s->next_p_frame_damaged) {
545 if (s->pict_type == AV_PICTURE_TYPE_B)
546 return get_consumed_bytes(s, buf_size);
548 s->next_p_frame_damaged = 0;
551 if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {
552 s->me.qpel_put = s->qdsp.put_qpel_pixels_tab;
553 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
555 s->me.qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
556 s->me.qpel_avg = s->qdsp.avg_qpel_pixels_tab;
559 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
562 if (!s->divx_packed && !avctx->hwaccel)
563 ff_thread_finish_setup(avctx);
565 if (avctx->hwaccel) {
566 ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer,
567 s->gb.buffer_end - s->gb.buffer);
572 ff_mpeg_er_frame_start(s);
574 /* the second part of the wmv2 header contains the MB skip bits which
575 * are stored in current_picture->mb_type which is not available before
576 * ff_mpv_frame_start() */
577 if (CONFIG_WMV2_DECODER && s->msmpeg4_version == 5) {
578 ret = ff_wmv2_decode_secondary_picture_header(s);
582 goto intrax8_decoded;
585 /* decode each macroblock */
589 ret = decode_slice(s);
590 while (s->mb_y < s->mb_height) {
591 if (s->msmpeg4_version) {
592 if (s->slice_height == 0 || s->mb_x != 0 ||
593 (s->mb_y % s->slice_height) != 0 || get_bits_left(&s->gb) < 0)
596 int prev_x = s->mb_x, prev_y = s->mb_y;
597 if (ff_h263_resync(s) < 0)
599 if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
600 s->er.error_occurred = 1;
603 if (s->msmpeg4_version < 4 && s->h263_pred)
604 ff_mpeg4_clean_buffers(s);
606 if (decode_slice(s) < 0)
607 ret = AVERROR_INVALIDDATA;
610 if (s->msmpeg4_version && s->msmpeg4_version < 4 &&
611 s->pict_type == AV_PICTURE_TYPE_I)
612 if (!CONFIG_MSMPEG4_DECODER ||
613 ff_msmpeg4_decode_ext_header(s, buf_size) < 0)
614 s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
616 assert(s->bitstream_buffer_size == 0);
618 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
619 ff_mpeg4_frame_end(avctx, buf, buf_size);
622 ff_er_frame_end(&s->er);
624 if (avctx->hwaccel) {
625 ret = avctx->hwaccel->end_frame(avctx);
632 if (!s->divx_packed && avctx->hwaccel)
633 ff_thread_finish_setup(avctx);
635 assert(s->current_picture.f->pict_type ==
636 s->current_picture_ptr->f->pict_type);
637 assert(s->current_picture.f->pict_type == s->pict_type);
638 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
639 if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
641 ff_print_debug_info(s, s->current_picture_ptr);
642 } else if (s->last_picture_ptr) {
643 if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
645 ff_print_debug_info(s, s->last_picture_ptr);
648 if (s->last_picture_ptr || s->low_delay)
651 if (ret && (avctx->err_recognition & AV_EF_EXPLODE))
654 return get_consumed_bytes(s, buf_size);
657 const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
658 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
659 AV_PIX_FMT_VAAPI_VLD,
661 #if CONFIG_H263_VDPAU_HWACCEL || CONFIG_MPEG4_VDPAU_HWACCEL
668 AVCodec ff_h263_decoder = {
670 .long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
671 .type = AVMEDIA_TYPE_VIDEO,
672 .id = AV_CODEC_ID_H263,
673 .priv_data_size = sizeof(MpegEncContext),
674 .init = ff_h263_decode_init,
675 .close = ff_h263_decode_end,
676 .decode = ff_h263_decode_frame,
677 .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
678 CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
679 .flush = ff_mpeg_flush,
680 .pix_fmts = ff_h263_hwaccel_pixfmt_list_420,