3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "avio_internal.h"
27 #if CONFIG_VOBSUB_DEMUXER
28 # include "subtitles.h"
29 # include "libavutil/bprint.h"
30 # include "libavutil/opt.h"
33 #include "libavutil/avassert.h"
35 /*********************************************/
38 #define MAX_SYNC_SIZE 100000
40 static int check_pes(const uint8_t *p, const uint8_t *end)
43 int pes2 = (p[3] & 0xC0) == 0x80 &&
44 (p[4] & 0xC0) != 0x40 &&
45 ((p[4] & 0xC0) == 0x00 ||
46 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
48 for (p += 3; p < end && *p == 0xFF; p++) ;
49 if ((*p & 0xC0) == 0x40)
52 if ((*p & 0xF0) == 0x20)
53 pes1 = p[0] & p[2] & p[4] & 1;
54 else if ((*p & 0xF0) == 0x30)
55 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
62 static int check_pack_header(const uint8_t *buf)
64 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
67 static int mpegps_probe(const AVProbeData *p)
71 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
72 int audio = 0, invalid = 0, score = 0;
75 for (i = 0; i < p->buf_size; i++) {
76 code = (code << 8) + p->buf[i];
77 if ((code & 0xffffff00) == 0x100) {
78 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
79 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
80 int pack = check_pack_header(p->buf + i);
82 if (code == SYSTEM_HEADER_START_CODE)
84 else if (code == PACK_START_CODE && pack)
86 else if ((code & 0xf0) == VIDEO_ID && pes) {
90 // skip pes payload to avoid start code emulation for private
92 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
93 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
94 else if (code == 0x1fd && pes) vid++; //VC1
96 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
97 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
98 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
102 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
103 score = AVPROBE_SCORE_EXTENSION / 2;
105 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
106 // vid, audio, sys, pspack, invalid, p->buf_size);
108 if (sys > invalid && sys * 9 <= pspack * 10)
109 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
110 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
111 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
112 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
113 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
114 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
115 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
116 return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
117 : AVPROBE_SCORE_EXTENSION / 2;
119 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
120 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
121 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
125 typedef struct MpegDemuxContext {
127 int32_t header_state;
128 unsigned char psm_es_type[256];
133 #if CONFIG_VOBSUB_DEMUXER
134 AVFormatContext *sub_ctx;
135 FFDemuxSubtitlesQueue q[32];
140 static int mpegps_read_header(AVFormatContext *s)
142 MpegDemuxContext *m = s->priv_data;
143 char buffer[7] = { 0 };
144 int64_t last_pos = avio_tell(s->pb);
146 m->header_state = 0xff;
147 s->ctx_flags |= AVFMTCTX_NOHEADER;
149 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
150 if (!memcmp("IMKH", buffer, 4)) {
152 } else if (!memcmp("Sofdec", buffer, 6)) {
155 avio_seek(s->pb, last_pos, SEEK_SET);
157 /* no need to do more */
161 static int64_t get_pts(AVIOContext *pb, int c)
165 buf[0] = c < 0 ? avio_r8(pb) : c;
166 avio_read(pb, buf + 1, 4);
168 return ff_parse_pes_pts(buf);
171 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
172 int32_t *header_state)
174 unsigned int state, v;
177 state = *header_state;
184 if (state == 0x000001) {
185 state = ((state << 8) | v) & 0xffffff;
189 state = ((state << 8) | v) & 0xffffff;
194 *header_state = state;
200 * Extract stream types from a program stream map
201 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
203 * @return number of bytes occupied by PSM in the bitstream
205 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
207 int psm_length, ps_info_length, es_map_length;
209 psm_length = avio_rb16(pb);
212 ps_info_length = avio_rb16(pb);
214 /* skip program_stream_info */
215 avio_skip(pb, ps_info_length);
216 /*es_map_length = */avio_rb16(pb);
217 /* Ignore es_map_length, trust psm_length */
218 es_map_length = psm_length - ps_info_length - 10;
220 /* at least one es available? */
221 while (es_map_length >= 4) {
222 unsigned char type = avio_r8(pb);
223 unsigned char es_id = avio_r8(pb);
224 uint16_t es_info_length = avio_rb16(pb);
226 /* remember mapping from stream id to stream type */
227 m->psm_es_type[es_id] = type;
228 /* skip program_stream_info */
229 avio_skip(pb, es_info_length);
230 es_map_length -= 4 + es_info_length;
232 avio_rb32(pb); /* crc32 */
233 return 2 + psm_length;
236 /* read the next PES header. Return its position in ppos
237 * (if not NULL), and its start code, pts and dts.
239 static int mpegps_read_pes_header(AVFormatContext *s,
240 int64_t *ppos, int *pstart_code,
241 int64_t *ppts, int64_t *pdts)
243 MpegDemuxContext *m = s->priv_data;
244 int len, size, startcode, c, flags, header_len;
245 int pes_ext, ext2_len, id_ext, skip;
247 int64_t last_sync = avio_tell(s->pb);
250 avio_seek(s->pb, last_sync, SEEK_SET);
252 /* next start code (should be immediately after) */
253 m->header_state = 0xff;
254 size = MAX_SYNC_SIZE;
255 startcode = find_next_start_code(s->pb, &size, &m->header_state);
256 last_sync = avio_tell(s->pb);
258 if (avio_feof(s->pb))
260 // FIXME we should remember header_state
264 if (startcode == PACK_START_CODE)
266 if (startcode == SYSTEM_HEADER_START_CODE)
268 if (startcode == PADDING_STREAM) {
269 avio_skip(s->pb, avio_rb16(s->pb));
272 if (startcode == PRIVATE_STREAM_2) {
274 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
275 int len = avio_rb16(s->pb);
277 uint8_t *ps2buf = av_malloc(len);
280 bytesread = avio_read(s->pb, ps2buf, len);
282 if (bytesread != len) {
283 avio_skip(s->pb, len - bytesread);
287 p = memchr(ps2buf, 'S', len - 5);
290 m->sofdec = !memcmp(p+1, "ofdec", 5);
292 m->sofdec -= !m->sofdec;
295 if (len == 980 && ps2buf[0] == 0) {
297 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
298 uint32_t endpts = AV_RB32(ps2buf + 0x11);
299 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
300 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
301 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
303 m->dvd = (hours <= 23 &&
306 (ps2buf[0x19] & 0x0f) < 10 &&
307 (ps2buf[0x1a] & 0x0f) < 10 &&
308 (ps2buf[0x1b] & 0x0f) < 10 &&
310 } else if (len == 1018 && ps2buf[0] == 1) {
312 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
313 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
314 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
316 m->dvd = (hours <= 23 &&
319 (ps2buf[0x1d] & 0x0f) < 10 &&
320 (ps2buf[0x1e] & 0x0f) < 10 &&
321 (ps2buf[0x1f] & 0x0f) < 10);
328 /* If this isn't a DVD packet or no memory
329 * could be allocated, just ignore it.
330 * If we did, move back to the start of the
331 * packet (plus 'length' field) */
332 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
334 * This packet will be lost but that can't be helped
335 * if we can't skip back
341 avio_skip(s->pb, len);
344 } else if (!m->dvd) {
345 int len = avio_rb16(s->pb);
346 avio_skip(s->pb, len);
350 if (startcode == PROGRAM_STREAM_MAP) {
351 mpegps_psm_parse(m, s->pb);
355 /* find matching stream */
356 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
357 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
358 (startcode == 0x1bd) ||
359 (startcode == PRIVATE_STREAM_2) ||
360 (startcode == 0x1fd)))
363 *ppos = avio_tell(s->pb) - 4;
365 len = avio_rb16(s->pb);
367 dts = AV_NOPTS_VALUE;
368 if (startcode != PRIVATE_STREAM_2)
376 /* XXX: for MPEG-1, should test only bit 7 */
380 if ((c & 0xc0) == 0x40) {
381 /* buffer scale & size */
386 if ((c & 0xe0) == 0x20) {
388 pts = get_pts(s->pb, c);
391 dts = get_pts(s->pb, -1);
394 } else if ((c & 0xc0) == 0x80) {
396 flags = avio_r8(s->pb);
397 header_len = avio_r8(s->pb);
399 if (header_len > len)
403 dts = pts = get_pts(s->pb, -1);
406 dts = get_pts(s->pb, -1);
410 if (flags & 0x3f && header_len == 0) {
412 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
414 if (flags & 0x01) { /* PES extension */
415 pes_ext = avio_r8(s->pb);
417 /* Skip PES private data, program packet sequence counter
418 * and P-STD buffer */
419 skip = (pes_ext >> 4) & 0xb;
421 if (pes_ext & 0x40 || skip > header_len) {
422 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
425 avio_skip(s->pb, skip);
428 if (pes_ext & 0x01) { /* PES extension 2 */
429 ext2_len = avio_r8(s->pb);
431 if ((ext2_len & 0x7f) > 0) {
432 id_ext = avio_r8(s->pb);
433 if ((id_ext & 0x80) == 0)
434 startcode = ((startcode & 0xff) << 8) | id_ext;
441 avio_skip(s->pb, header_len);
446 if (startcode == PRIVATE_STREAM_1) {
447 int ret = ffio_ensure_seekback(s->pb, 2);
452 startcode = avio_r8(s->pb);
454 if (startcode == 0x0b) {
455 if (avio_r8(s->pb) == 0x77) {
458 avio_skip(s->pb, -2);
460 avio_skip(s->pb, -1);
468 if (dts != AV_NOPTS_VALUE && ppos) {
470 for (i = 0; i < s->nb_streams; i++) {
471 if (startcode == s->streams[i]->id &&
472 (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
473 ff_reduce_index(s, i);
474 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
475 AVINDEX_KEYFRAME /* FIXME keyframe? */);
480 *pstart_code = startcode;
486 static int mpegps_read_packet(AVFormatContext *s,
489 MpegDemuxContext *m = s->priv_data;
491 int len, startcode, i, es_type, ret;
493 int request_probe= 0;
494 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
495 enum AVMediaType type;
496 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
499 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
503 if (startcode >= 0x80 && startcode <= 0xcf) {
508 /* audio: skip header */
511 if (startcode >= 0xb0 && startcode <= 0xbf) {
512 /* MLP/TrueHD audio has a 4-byte header */
515 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
516 ret = ffio_ensure_seekback(s->pb, 3);
519 pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80;
520 avio_skip(s->pb, -3);
525 /* now find stream */
526 for (i = 0; i < s->nb_streams; i++) {
528 if (st->id == startcode)
532 es_type = m->psm_es_type[startcode & 0xff];
533 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
534 codec_id = AV_CODEC_ID_MPEG2VIDEO;
535 type = AVMEDIA_TYPE_VIDEO;
536 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
537 codec_id = AV_CODEC_ID_MPEG2VIDEO;
538 type = AVMEDIA_TYPE_VIDEO;
539 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
540 es_type == STREAM_TYPE_AUDIO_MPEG2) {
541 codec_id = AV_CODEC_ID_MP3;
542 type = AVMEDIA_TYPE_AUDIO;
543 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
544 codec_id = AV_CODEC_ID_AAC;
545 type = AVMEDIA_TYPE_AUDIO;
546 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
547 codec_id = AV_CODEC_ID_MPEG4;
548 type = AVMEDIA_TYPE_VIDEO;
549 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
550 codec_id = AV_CODEC_ID_H264;
551 type = AVMEDIA_TYPE_VIDEO;
552 } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
553 codec_id = AV_CODEC_ID_HEVC;
554 type = AVMEDIA_TYPE_VIDEO;
555 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
556 codec_id = AV_CODEC_ID_AC3;
557 type = AVMEDIA_TYPE_AUDIO;
558 } else if (m->imkh_cctv && es_type == 0x91) {
559 codec_id = AV_CODEC_ID_PCM_MULAW;
560 type = AVMEDIA_TYPE_AUDIO;
561 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
562 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
563 unsigned char buf[8];
565 avio_read(s->pb, buf, 8);
566 avio_seek(s->pb, -8, SEEK_CUR);
567 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
568 codec_id = AV_CODEC_ID_CAVS;
571 type = AVMEDIA_TYPE_VIDEO;
572 } else if (startcode == PRIVATE_STREAM_2) {
573 type = AVMEDIA_TYPE_DATA;
574 codec_id = AV_CODEC_ID_DVD_NAV;
575 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
576 type = AVMEDIA_TYPE_AUDIO;
578 codec_id = AV_CODEC_ID_ADPCM_ADX;
581 } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
582 codec_id = AV_CODEC_ID_PCM_ALAW;
585 codec_id = AV_CODEC_ID_MP2;
589 } else if (startcode >= 0x80 && startcode <= 0x87) {
590 type = AVMEDIA_TYPE_AUDIO;
591 codec_id = AV_CODEC_ID_AC3;
592 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
593 (startcode >= 0x98 && startcode <= 0x9f)) {
594 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
595 type = AVMEDIA_TYPE_AUDIO;
596 codec_id = AV_CODEC_ID_DTS;
597 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
598 type = AVMEDIA_TYPE_AUDIO;
600 codec_id = AV_CODEC_ID_MLP;
602 codec_id = AV_CODEC_ID_PCM_DVD;
604 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
605 type = AVMEDIA_TYPE_AUDIO;
606 codec_id = AV_CODEC_ID_TRUEHD;
607 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
608 /* Used for both AC-3 and E-AC-3 in EVOB files */
609 type = AVMEDIA_TYPE_AUDIO;
610 codec_id = AV_CODEC_ID_AC3;
611 } else if (startcode >= 0x20 && startcode <= 0x3f) {
612 type = AVMEDIA_TYPE_SUBTITLE;
613 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
614 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
615 type = AVMEDIA_TYPE_VIDEO;
616 codec_id = AV_CODEC_ID_VC1;
620 avio_skip(s->pb, len);
623 /* no stream found: add a new stream */
624 st = avformat_new_stream(s, NULL);
628 st->codecpar->codec_type = type;
629 st->codecpar->codec_id = codec_id;
630 if ( st->codecpar->codec_id == AV_CODEC_ID_PCM_MULAW
631 || st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW) {
632 st->codecpar->channels = 1;
633 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
634 st->codecpar->sample_rate = 8000;
636 st->request_probe = request_probe;
637 st->need_parsing = AVSTREAM_PARSE_FULL;
640 if (st->discard >= AVDISCARD_ALL)
642 if (startcode >= 0xa0 && startcode <= 0xaf) {
643 if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
650 ret = av_get_packet(s->pb, pkt, len);
654 pkt->pos = dummy_pos;
655 pkt->stream_index = st->index;
657 if (s->debug & FF_FDEBUG_TS)
658 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
659 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
662 return (ret < 0) ? ret : 0;
665 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
666 int64_t *ppos, int64_t pos_limit)
669 int64_t pos, pts, dts;
672 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
673 return AV_NOPTS_VALUE;
676 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
678 if (s->debug & FF_FDEBUG_TS)
679 av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
680 return AV_NOPTS_VALUE;
682 if (startcode == s->streams[stream_index]->id &&
683 dts != AV_NOPTS_VALUE) {
686 avio_skip(s->pb, len);
688 if (s->debug & FF_FDEBUG_TS)
689 av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
690 pos, dts, dts / 90000.0);
695 AVInputFormat ff_mpegps_demuxer = {
697 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
698 .priv_data_size = sizeof(MpegDemuxContext),
699 .read_probe = mpegps_probe,
700 .read_header = mpegps_read_header,
701 .read_packet = mpegps_read_packet,
702 .read_timestamp = mpegps_read_dts,
703 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
706 #if CONFIG_VOBSUB_DEMUXER
708 #define REF_STRING "# VobSub index file,"
709 #define MAX_LINE_SIZE 2048
711 static int vobsub_probe(const AVProbeData *p)
713 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
714 return AVPROBE_SCORE_MAX;
718 static int vobsub_read_header(AVFormatContext *s)
720 int i, ret = 0, header_parsed = 0, langidx = 0;
721 MpegDemuxContext *vobsub = s->priv_data;
723 char *header_str = NULL;
729 char alt[MAX_LINE_SIZE] = {0};
730 ff_const59 AVInputFormat *iformat;
732 if (!vobsub->sub_name) {
734 vobsub->sub_name = av_strdup(s->url);
735 if (!vobsub->sub_name) {
736 ret = AVERROR(ENOMEM);
740 fname_len = strlen(vobsub->sub_name);
741 ext = vobsub->sub_name - 3 + fname_len;
742 if (fname_len < 4 || *(ext - 1) != '.') {
743 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
744 "to guess the associated .SUB file\n");
745 ret = AVERROR_INVALIDDATA;
748 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
749 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
752 if (!(iformat = av_find_input_format("mpeg"))) {
753 ret = AVERROR_DEMUXER_NOT_FOUND;
757 vobsub->sub_ctx = avformat_alloc_context();
758 if (!vobsub->sub_ctx) {
759 ret = AVERROR(ENOMEM);
763 if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
766 ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
768 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
772 av_bprint_init(&header, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
773 while (!avio_feof(s->pb)) {
774 char line[MAX_LINE_SIZE];
775 int len = ff_get_line(s->pb, line, sizeof(line));
780 line[strcspn(line, "\r\n")] = 0;
782 if (!strncmp(line, "id:", 3)) {
783 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
784 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
785 "assuming 'id: und, index: 0'\n", line);
790 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
791 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
792 ret = AVERROR(EINVAL);
798 /* We do not create the stream immediately to avoid adding empty
799 * streams. See the following timestamp entry. */
801 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
803 } else if (!strncmp(line, "timestamp:", 10)) {
806 int64_t pos, timestamp;
807 const char *p = line + 10;
809 if (stream_id == -1) {
810 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
811 ret = AVERROR_INVALIDDATA;
815 if (!st || st->id != stream_id) {
816 st = avformat_new_stream(s, NULL);
818 ret = AVERROR(ENOMEM);
822 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
823 st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
824 avpriv_set_pts_info(st, 64, 1, 1000);
825 av_dict_set(&st->metadata, "language", id, 0);
827 av_dict_set(&st->metadata, "title", alt, 0);
830 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
831 &hh, &mm, &ss, &ms, &pos) != 5) {
832 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
833 "abort parsing\n", line);
834 ret = AVERROR_INVALIDDATA;
837 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
838 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
840 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
842 ret = AVERROR(ENOMEM);
846 sub->pts = timestamp;
847 sub->stream_index = s->nb_streams - 1;
849 } else if (!strncmp(line, "alt:", 4)) {
850 const char *p = line + 4;
854 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
855 av_strlcpy(alt, p, sizeof(alt));
858 } else if (!strncmp(line, "delay:", 6)) {
859 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
860 const char *p = line + 6;
864 if (*p == '-' || *p == '+') {
865 sign = *p == '-' ? -1 : 1;
868 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
869 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
871 } else if (!strncmp(line, "langidx:", 8)) {
872 const char *p = line + 8;
874 if (sscanf(p, "%d", &langidx) != 1)
875 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
877 } else if (!header_parsed) {
878 if (line[0] && line[0] != '#')
879 av_bprintf(&header, "%s\n", line);
883 if (langidx < s->nb_streams)
884 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
886 for (i = 0; i < s->nb_streams; i++) {
887 vobsub->q[i].sort = SUB_SORT_POS_TS;
888 vobsub->q[i].keep_duplicates = 1;
889 ff_subtitles_queue_finalize(s, &vobsub->q[i]);
892 if (!av_bprint_is_complete(&header)) {
893 av_bprint_finalize(&header, NULL);
894 ret = AVERROR(ENOMEM);
897 av_bprint_finalize(&header, &header_str);
898 for (i = 0; i < s->nb_streams; i++) {
899 AVCodecParameters *par = s->streams[i]->codecpar;
900 ret = ff_alloc_extradata(par, header.len);
904 memcpy(par->extradata, header_str, header.len);
912 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
914 MpegDemuxContext *vobsub = s->priv_data;
915 FFDemuxSubtitlesQueue *q;
916 AVIOContext *pb = vobsub->sub_ctx->pb;
917 int ret, psize, total_read = 0, i;
918 AVPacket idx_pkt = { 0 };
920 int64_t min_ts = INT64_MAX;
922 for (i = 0; i < s->nb_streams; i++) {
923 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
925 av_assert0(tmpq->nb_subs);
926 ts = tmpq->subs[tmpq->current_sub_idx].pts;
933 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
937 /* compute maximum packet size using the next packet position. This is
938 * useful when the len in the header is non-sense */
939 if (q->current_sub_idx < q->nb_subs) {
940 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
942 int64_t fsize = avio_size(pb);
943 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
946 avio_seek(pb, idx_pkt.pos, SEEK_SET);
953 int n, to_read, startcode;
955 int64_t old_pos = avio_tell(pb), new_pos;
958 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
960 if (pkt->size) // raise packet even if incomplete
964 to_read = ret & 0xffff;
965 new_pos = avio_tell(pb);
966 pkt_size = ret + (new_pos - old_pos);
968 /* this prevents reads above the current packet */
969 if (total_read + pkt_size > psize)
971 total_read += pkt_size;
973 /* the current chunk doesn't match the stream index (unlikely) */
974 if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id)
977 ret = av_grow_packet(pkt, to_read);
981 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
983 pkt->size -= to_read - n;
984 } while (total_read < psize);
986 pkt->pts = pkt->dts = idx_pkt.pts;
987 pkt->pos = idx_pkt.pos;
988 pkt->stream_index = idx_pkt.stream_index;
990 av_packet_unref(&idx_pkt);
994 av_packet_unref(pkt);
995 av_packet_unref(&idx_pkt);
999 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
1000 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
1002 MpegDemuxContext *vobsub = s->priv_data;
1004 /* Rescale requested timestamps based on the first stream (timebase is the
1005 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
1006 * like in avformat_seek_file(). */
1007 if (stream_index == -1 && s->nb_streams != 1) {
1009 AVRational time_base = s->streams[0]->time_base;
1010 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1011 min_ts = av_rescale_rnd(min_ts, time_base.den,
1012 time_base.num * (int64_t)AV_TIME_BASE,
1013 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
1014 max_ts = av_rescale_rnd(max_ts, time_base.den,
1015 time_base.num * (int64_t)AV_TIME_BASE,
1016 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
1017 for (i = 0; i < s->nb_streams; i++) {
1018 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1019 min_ts, ts, max_ts, flags);
1026 if (stream_index == -1) // only 1 stream
1028 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1029 min_ts, ts, max_ts, flags);
1032 static int vobsub_read_close(AVFormatContext *s)
1035 MpegDemuxContext *vobsub = s->priv_data;
1037 for (i = 0; i < s->nb_streams; i++)
1038 ff_subtitles_queue_clean(&vobsub->q[i]);
1039 if (vobsub->sub_ctx)
1040 avformat_close_input(&vobsub->sub_ctx);
1044 static const AVOption options[] = {
1045 { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1049 static const AVClass vobsub_demuxer_class = {
1050 .class_name = "vobsub",
1051 .item_name = av_default_item_name,
1053 .version = LIBAVUTIL_VERSION_INT,
1056 AVInputFormat ff_vobsub_demuxer = {
1058 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1059 .priv_data_size = sizeof(MpegDemuxContext),
1060 .read_probe = vobsub_probe,
1061 .read_header = vobsub_read_header,
1062 .read_packet = vobsub_read_packet,
1063 .read_seek2 = vobsub_read_seek,
1064 .read_close = vobsub_read_close,
1065 .flags = AVFMT_SHOW_IDS,
1066 .extensions = "idx",
1067 .priv_class = &vobsub_demuxer_class,