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
26 #if CONFIG_VOBSUB_DEMUXER
27 # include "subtitles.h"
28 # include "libavutil/bprint.h"
29 # include "libavutil/opt.h"
32 #include "libavutil/avassert.h"
34 /*********************************************/
37 #define MAX_SYNC_SIZE 100000
39 static int check_pes(const uint8_t *p, const uint8_t *end)
42 int pes2 = (p[3] & 0xC0) == 0x80 &&
43 (p[4] & 0xC0) != 0x40 &&
44 ((p[4] & 0xC0) == 0x00 ||
45 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
47 for (p += 3; p < end && *p == 0xFF; p++) ;
48 if ((*p & 0xC0) == 0x40)
51 if ((*p & 0xF0) == 0x20)
52 pes1 = p[0] & p[2] & p[4] & 1;
53 else if ((*p & 0xF0) == 0x30)
54 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
61 static int check_pack_header(const uint8_t *buf)
63 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
66 static int mpegps_probe(AVProbeData *p)
70 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
71 int audio = 0, invalid = 0, score = 0;
74 for (i = 0; i < p->buf_size; i++) {
75 code = (code << 8) + p->buf[i];
76 if ((code & 0xffffff00) == 0x100) {
77 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
78 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
79 int pack = check_pack_header(p->buf + i);
81 if (code == SYSTEM_HEADER_START_CODE)
83 else if (code == PACK_START_CODE && pack)
85 else if ((code & 0xf0) == VIDEO_ID && pes) {
89 // skip pes payload to avoid start code emulation for private
91 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
92 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
93 else if (code == 0x1fd && pes) vid++; //VC1
95 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
96 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
97 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
101 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
102 score = AVPROBE_SCORE_EXTENSION / 2;
104 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
105 // vid, audio, sys, pspack, invalid, p->buf_size);
107 if (sys > invalid && sys * 9 <= pspack * 10)
108 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
109 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
110 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
111 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
112 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
113 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
114 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
115 return (audio > 12 || vid > 3 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
116 : AVPROBE_SCORE_EXTENSION / 2;
118 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
119 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
120 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
124 typedef struct MpegDemuxContext {
126 int32_t header_state;
127 unsigned char psm_es_type[256];
131 #if CONFIG_VOBSUB_DEMUXER
132 AVFormatContext *sub_ctx;
133 FFDemuxSubtitlesQueue q[32];
138 static int mpegps_read_header(AVFormatContext *s)
140 MpegDemuxContext *m = s->priv_data;
142 int64_t last_pos = avio_tell(s->pb);
144 m->header_state = 0xff;
145 s->ctx_flags |= AVFMTCTX_NOHEADER;
147 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
148 if (!memcmp("IMKH", buffer, 4)) {
150 } else if (!memcmp("Sofdec", buffer, 6)) {
153 avio_seek(s->pb, last_pos, SEEK_SET);
155 /* no need to do more */
159 static int64_t get_pts(AVIOContext *pb, int c)
163 buf[0] = c < 0 ? avio_r8(pb) : c;
164 avio_read(pb, buf + 1, 4);
166 return ff_parse_pes_pts(buf);
169 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
170 int32_t *header_state)
172 unsigned int state, v;
175 state = *header_state;
182 if (state == 0x000001) {
183 state = ((state << 8) | v) & 0xffffff;
187 state = ((state << 8) | v) & 0xffffff;
192 *header_state = state;
198 * Extract stream types from a program stream map
199 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
201 * @return number of bytes occupied by PSM in the bitstream
203 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
205 int psm_length, ps_info_length, es_map_length;
207 psm_length = avio_rb16(pb);
210 ps_info_length = avio_rb16(pb);
212 /* skip program_stream_info */
213 avio_skip(pb, ps_info_length);
214 /*es_map_length = */avio_rb16(pb);
215 /* Ignore es_map_length, trust psm_length */
216 es_map_length = psm_length - ps_info_length - 10;
218 /* at least one es available? */
219 while (es_map_length >= 4) {
220 unsigned char type = avio_r8(pb);
221 unsigned char es_id = avio_r8(pb);
222 uint16_t es_info_length = avio_rb16(pb);
224 /* remember mapping from stream id to stream type */
225 m->psm_es_type[es_id] = type;
226 /* skip program_stream_info */
227 avio_skip(pb, es_info_length);
228 es_map_length -= 4 + es_info_length;
230 avio_rb32(pb); /* crc32 */
231 return 2 + psm_length;
234 /* read the next PES header. Return its position in ppos
235 * (if not NULL), and its start code, pts and dts.
237 static int mpegps_read_pes_header(AVFormatContext *s,
238 int64_t *ppos, int *pstart_code,
239 int64_t *ppts, int64_t *pdts)
241 MpegDemuxContext *m = s->priv_data;
242 int len, size, startcode, c, flags, header_len;
243 int pes_ext, ext2_len, id_ext, skip;
245 int64_t last_sync = avio_tell(s->pb);
248 avio_seek(s->pb, last_sync, SEEK_SET);
250 /* next start code (should be immediately after) */
251 m->header_state = 0xff;
252 size = MAX_SYNC_SIZE;
253 startcode = find_next_start_code(s->pb, &size, &m->header_state);
254 last_sync = avio_tell(s->pb);
256 if (avio_feof(s->pb))
258 // FIXME we should remember header_state
259 return AVERROR(EAGAIN);
262 if (startcode == PACK_START_CODE)
264 if (startcode == SYSTEM_HEADER_START_CODE)
266 if (startcode == PADDING_STREAM) {
267 avio_skip(s->pb, avio_rb16(s->pb));
270 if (startcode == PRIVATE_STREAM_2) {
272 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
273 int len = avio_rb16(s->pb);
275 uint8_t *ps2buf = av_malloc(len);
278 bytesread = avio_read(s->pb, ps2buf, len);
280 if (bytesread != len) {
281 avio_skip(s->pb, len - bytesread);
285 p = memchr(ps2buf, 'S', len - 5);
288 m->sofdec = !memcmp(p+1, "ofdec", 5);
290 m->sofdec -= !m->sofdec;
293 if (len == 980 && ps2buf[0] == 0) {
295 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
296 uint32_t endpts = AV_RB32(ps2buf + 0x11);
297 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
298 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
299 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
301 m->dvd = (hours <= 23 &&
304 (ps2buf[0x19] & 0x0f) < 10 &&
305 (ps2buf[0x1a] & 0x0f) < 10 &&
306 (ps2buf[0x1b] & 0x0f) < 10 &&
308 } else if (len == 1018 && ps2buf[0] == 1) {
310 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
311 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
312 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
314 m->dvd = (hours <= 23 &&
317 (ps2buf[0x1d] & 0x0f) < 10 &&
318 (ps2buf[0x1e] & 0x0f) < 10 &&
319 (ps2buf[0x1f] & 0x0f) < 10);
326 /* If this isn't a DVD packet or no memory
327 * could be allocated, just ignore it.
328 * If we did, move back to the start of the
329 * packet (plus 'length' field) */
330 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
332 * This packet will be lost but that can't be helped
333 * if we can't skip back
339 avio_skip(s->pb, len);
342 } else if (!m->dvd) {
343 int len = avio_rb16(s->pb);
344 avio_skip(s->pb, len);
348 if (startcode == PROGRAM_STREAM_MAP) {
349 mpegps_psm_parse(m, s->pb);
353 /* find matching stream */
354 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
355 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
356 (startcode == 0x1bd) ||
357 (startcode == PRIVATE_STREAM_2) ||
358 (startcode == 0x1fd)))
361 *ppos = avio_tell(s->pb) - 4;
363 len = avio_rb16(s->pb);
365 dts = AV_NOPTS_VALUE;
366 if (startcode != PRIVATE_STREAM_2)
374 /* XXX: for mpeg1, should test only bit 7 */
378 if ((c & 0xc0) == 0x40) {
379 /* buffer scale & size */
384 if ((c & 0xe0) == 0x20) {
386 pts = get_pts(s->pb, c);
389 dts = get_pts(s->pb, -1);
392 } else if ((c & 0xc0) == 0x80) {
394 flags = avio_r8(s->pb);
395 header_len = avio_r8(s->pb);
397 if (header_len > len)
401 dts = pts = get_pts(s->pb, -1);
404 dts = get_pts(s->pb, -1);
408 if (flags & 0x3f && header_len == 0) {
410 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
412 if (flags & 0x01) { /* PES extension */
413 pes_ext = avio_r8(s->pb);
415 /* Skip PES private data, program packet sequence counter
416 * and P-STD buffer */
417 skip = (pes_ext >> 4) & 0xb;
419 if (pes_ext & 0x40 || skip > header_len) {
420 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
423 avio_skip(s->pb, skip);
426 if (pes_ext & 0x01) { /* PES extension 2 */
427 ext2_len = avio_r8(s->pb);
429 if ((ext2_len & 0x7f) > 0) {
430 id_ext = avio_r8(s->pb);
431 if ((id_ext & 0x80) == 0)
432 startcode = ((startcode & 0xff) << 8) | id_ext;
439 avio_skip(s->pb, header_len);
444 if (startcode == PRIVATE_STREAM_1) {
445 startcode = avio_r8(s->pb);
450 if (dts != AV_NOPTS_VALUE && ppos) {
452 for (i = 0; i < s->nb_streams; i++) {
453 if (startcode == s->streams[i]->id &&
454 s->pb->seekable /* index useless on streams anyway */) {
455 ff_reduce_index(s, i);
456 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
457 AVINDEX_KEYFRAME /* FIXME keyframe? */);
462 *pstart_code = startcode;
468 static int mpegps_read_packet(AVFormatContext *s,
471 MpegDemuxContext *m = s->priv_data;
473 int len, startcode, i, es_type, ret;
474 int lpcm_header_len = -1; //Init to suppress warning
475 int request_probe= 0;
476 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
477 enum AVMediaType type;
478 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
481 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
485 if (startcode >= 0x80 && startcode <= 0xcf) {
489 /* audio: skip header */
491 lpcm_header_len = avio_rb16(s->pb);
493 if (startcode >= 0xb0 && startcode <= 0xbf) {
494 /* MLP/TrueHD audio has a 4-byte header */
500 /* now find stream */
501 for (i = 0; i < s->nb_streams; i++) {
503 if (st->id == startcode)
507 es_type = m->psm_es_type[startcode & 0xff];
508 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
509 codec_id = AV_CODEC_ID_MPEG2VIDEO;
510 type = AVMEDIA_TYPE_VIDEO;
511 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
512 codec_id = AV_CODEC_ID_MPEG2VIDEO;
513 type = AVMEDIA_TYPE_VIDEO;
514 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
515 es_type == STREAM_TYPE_AUDIO_MPEG2) {
516 codec_id = AV_CODEC_ID_MP3;
517 type = AVMEDIA_TYPE_AUDIO;
518 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
519 codec_id = AV_CODEC_ID_AAC;
520 type = AVMEDIA_TYPE_AUDIO;
521 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
522 codec_id = AV_CODEC_ID_MPEG4;
523 type = AVMEDIA_TYPE_VIDEO;
524 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
525 codec_id = AV_CODEC_ID_H264;
526 type = AVMEDIA_TYPE_VIDEO;
527 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
528 codec_id = AV_CODEC_ID_AC3;
529 type = AVMEDIA_TYPE_AUDIO;
530 } else if (m->imkh_cctv && es_type == 0x91) {
531 codec_id = AV_CODEC_ID_PCM_MULAW;
532 type = AVMEDIA_TYPE_AUDIO;
533 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
534 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
535 unsigned char buf[8];
537 avio_read(s->pb, buf, 8);
538 avio_seek(s->pb, -8, SEEK_CUR);
539 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
540 codec_id = AV_CODEC_ID_CAVS;
543 type = AVMEDIA_TYPE_VIDEO;
544 } else if (startcode == PRIVATE_STREAM_2) {
545 type = AVMEDIA_TYPE_DATA;
546 codec_id = AV_CODEC_ID_DVD_NAV;
547 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
548 type = AVMEDIA_TYPE_AUDIO;
550 codec_id = AV_CODEC_ID_ADPCM_ADX;
553 } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
554 codec_id = AV_CODEC_ID_PCM_ALAW;
557 codec_id = AV_CODEC_ID_MP2;
561 } else if (startcode >= 0x80 && startcode <= 0x87) {
562 type = AVMEDIA_TYPE_AUDIO;
563 codec_id = AV_CODEC_ID_AC3;
564 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
565 (startcode >= 0x98 && startcode <= 0x9f)) {
566 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
567 type = AVMEDIA_TYPE_AUDIO;
568 codec_id = AV_CODEC_ID_DTS;
569 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
570 type = AVMEDIA_TYPE_AUDIO;
571 if (lpcm_header_len == 6) {
572 codec_id = AV_CODEC_ID_MLP;
574 codec_id = AV_CODEC_ID_PCM_DVD;
576 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
577 type = AVMEDIA_TYPE_AUDIO;
578 codec_id = AV_CODEC_ID_TRUEHD;
579 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
580 /* Used for both AC-3 and E-AC-3 in EVOB files */
581 type = AVMEDIA_TYPE_AUDIO;
582 codec_id = AV_CODEC_ID_AC3;
583 } else if (startcode >= 0x20 && startcode <= 0x3f) {
584 type = AVMEDIA_TYPE_SUBTITLE;
585 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
586 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
587 type = AVMEDIA_TYPE_VIDEO;
588 codec_id = AV_CODEC_ID_VC1;
592 avio_skip(s->pb, len);
595 /* no stream found: add a new stream */
596 st = avformat_new_stream(s, NULL);
600 st->codec->codec_type = type;
601 st->codec->codec_id = codec_id;
602 if ( st->codec->codec_id == AV_CODEC_ID_PCM_MULAW
603 || st->codec->codec_id == AV_CODEC_ID_PCM_ALAW) {
604 st->codec->channels = 1;
605 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
606 st->codec->sample_rate = 8000;
608 st->request_probe = request_probe;
609 st->need_parsing = AVSTREAM_PARSE_FULL;
612 if (st->discard >= AVDISCARD_ALL)
614 if (startcode >= 0xa0 && startcode <= 0xaf) {
615 if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) {
622 ret = av_get_packet(s->pb, pkt, len);
626 pkt->pos = dummy_pos;
627 pkt->stream_index = st->index;
629 if (s->debug & FF_FDEBUG_TS)
630 av_log(s, AV_LOG_TRACE, "%d: pts=%0.3f dts=%0.3f size=%d\n",
631 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
634 return (ret < 0) ? ret : 0;
637 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
638 int64_t *ppos, int64_t pos_limit)
641 int64_t pos, pts, dts;
644 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
645 return AV_NOPTS_VALUE;
648 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
650 if (s->debug & FF_FDEBUG_TS)
651 av_log(s, AV_LOG_TRACE, "none (ret=%d)\n", len);
652 return AV_NOPTS_VALUE;
654 if (startcode == s->streams[stream_index]->id &&
655 dts != AV_NOPTS_VALUE) {
658 avio_skip(s->pb, len);
660 if (s->debug & FF_FDEBUG_TS)
661 av_log(s, AV_LOG_TRACE, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
662 pos, dts, dts / 90000.0);
667 AVInputFormat ff_mpegps_demuxer = {
669 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
670 .priv_data_size = sizeof(MpegDemuxContext),
671 .read_probe = mpegps_probe,
672 .read_header = mpegps_read_header,
673 .read_packet = mpegps_read_packet,
674 .read_timestamp = mpegps_read_dts,
675 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
678 #if CONFIG_VOBSUB_DEMUXER
680 #define REF_STRING "# VobSub index file,"
681 #define MAX_LINE_SIZE 2048
683 static int vobsub_probe(AVProbeData *p)
685 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
686 return AVPROBE_SCORE_MAX;
690 static int vobsub_read_header(AVFormatContext *s)
692 int i, ret = 0, header_parsed = 0, langidx = 0;
693 MpegDemuxContext *vobsub = s->priv_data;
701 char alt[MAX_LINE_SIZE] = {0};
702 AVInputFormat *iformat;
704 if (!vobsub->sub_name) {
706 vobsub->sub_name = av_strdup(s->filename);
707 if (!vobsub->sub_name) {
708 ret = AVERROR(ENOMEM);
712 fname_len = strlen(vobsub->sub_name);
713 ext = vobsub->sub_name - 3 + fname_len;
714 if (fname_len < 4 || *(ext - 1) != '.') {
715 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
716 "to guess the associated .SUB file\n");
717 ret = AVERROR_INVALIDDATA;
720 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
721 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, vobsub->sub_name);
724 if (!(iformat = av_find_input_format("mpeg"))) {
725 ret = AVERROR_DEMUXER_NOT_FOUND;
729 vobsub->sub_ctx = avformat_alloc_context();
730 if (!vobsub->sub_ctx) {
731 ret = AVERROR(ENOMEM);
735 if ((ret = ff_copy_whitelists(vobsub->sub_ctx, s)) < 0)
738 ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
740 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
744 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
745 while (!avio_feof(s->pb)) {
746 char line[MAX_LINE_SIZE];
747 int len = ff_get_line(s->pb, line, sizeof(line));
752 line[strcspn(line, "\r\n")] = 0;
754 if (!strncmp(line, "id:", 3)) {
755 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
756 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
757 "assuming 'id: und, index: 0'\n", line);
762 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
763 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
764 ret = AVERROR(EINVAL);
770 /* We do not create the stream immediately to avoid adding empty
771 * streams. See the following timestamp entry. */
773 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
775 } else if (!strncmp(line, "timestamp:", 10)) {
778 int64_t pos, timestamp;
779 const char *p = line + 10;
781 if (stream_id == -1) {
782 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
783 ret = AVERROR_INVALIDDATA;
787 if (!st || st->id != stream_id) {
788 st = avformat_new_stream(s, NULL);
790 ret = AVERROR(ENOMEM);
794 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
795 st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
796 avpriv_set_pts_info(st, 64, 1, 1000);
797 av_dict_set(&st->metadata, "language", id, 0);
799 av_dict_set(&st->metadata, "title", alt, 0);
802 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
803 &hh, &mm, &ss, &ms, &pos) != 5) {
804 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
805 "abort parsing\n", line);
806 ret = AVERROR_INVALIDDATA;
809 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
810 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
812 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
814 ret = AVERROR(ENOMEM);
818 sub->pts = timestamp;
819 sub->stream_index = s->nb_streams - 1;
821 } else if (!strncmp(line, "alt:", 4)) {
822 const char *p = line + 4;
826 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
827 av_strlcpy(alt, p, sizeof(alt));
830 } else if (!strncmp(line, "delay:", 6)) {
831 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
832 const char *p = line + 6;
836 if (*p == '-' || *p == '+') {
837 sign = *p == '-' ? -1 : 1;
840 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
841 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
843 } else if (!strncmp(line, "langidx:", 8)) {
844 const char *p = line + 8;
846 if (sscanf(p, "%d", &langidx) != 1)
847 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
849 } else if (!header_parsed) {
850 if (line[0] && line[0] != '#')
851 av_bprintf(&header, "%s\n", line);
855 if (langidx < s->nb_streams)
856 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
858 for (i = 0; i < s->nb_streams; i++) {
859 vobsub->q[i].sort = SUB_SORT_POS_TS;
860 ff_subtitles_queue_finalize(&vobsub->q[i]);
863 if (!av_bprint_is_complete(&header)) {
864 av_bprint_finalize(&header, NULL);
865 ret = AVERROR(ENOMEM);
868 av_bprint_finalize(&header, &header_str);
869 for (i = 0; i < s->nb_streams; i++) {
870 AVStream *sub_st = s->streams[i];
871 sub_st->codec->extradata = av_strdup(header_str);
872 sub_st->codec->extradata_size = header.len;
880 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
882 MpegDemuxContext *vobsub = s->priv_data;
883 FFDemuxSubtitlesQueue *q;
884 AVIOContext *pb = vobsub->sub_ctx->pb;
885 int ret, psize, total_read = 0, i;
888 int64_t min_ts = INT64_MAX;
890 for (i = 0; i < s->nb_streams; i++) {
891 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
893 av_assert0(tmpq->nb_subs);
894 ts = tmpq->subs[tmpq->current_sub_idx].pts;
901 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
905 /* compute maximum packet size using the next packet position. This is
906 * useful when the len in the header is non-sense */
907 if (q->current_sub_idx < q->nb_subs) {
908 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
910 int64_t fsize = avio_size(pb);
911 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
914 avio_seek(pb, idx_pkt.pos, SEEK_SET);
921 int n, to_read, startcode;
923 int64_t old_pos = avio_tell(pb), new_pos;
926 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
928 if (pkt->size) // raise packet even if incomplete
932 to_read = ret & 0xffff;
933 new_pos = avio_tell(pb);
934 pkt_size = ret + (new_pos - old_pos);
936 /* this prevents reads above the current packet */
937 if (total_read + pkt_size > psize)
939 total_read += pkt_size;
941 /* the current chunk doesn't match the stream index (unlikely) */
942 if ((startcode & 0x1f) != idx_pkt.stream_index)
945 ret = av_grow_packet(pkt, to_read);
949 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
951 pkt->size -= to_read - n;
952 } while (total_read < psize);
954 pkt->pts = pkt->dts = idx_pkt.pts;
955 pkt->pos = idx_pkt.pos;
956 pkt->stream_index = idx_pkt.stream_index;
958 av_free_packet(&idx_pkt);
963 av_free_packet(&idx_pkt);
967 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
968 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
970 MpegDemuxContext *vobsub = s->priv_data;
972 /* Rescale requested timestamps based on the first stream (timebase is the
973 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
974 * like in avformat_seek_file(). */
975 if (stream_index == -1 && s->nb_streams != 1) {
977 AVRational time_base = s->streams[0]->time_base;
978 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
979 min_ts = av_rescale_rnd(min_ts, time_base.den,
980 time_base.num * (int64_t)AV_TIME_BASE,
981 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
982 max_ts = av_rescale_rnd(max_ts, time_base.den,
983 time_base.num * (int64_t)AV_TIME_BASE,
984 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
985 for (i = 0; i < s->nb_streams; i++) {
986 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
987 min_ts, ts, max_ts, flags);
994 if (stream_index == -1) // only 1 stream
996 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
997 min_ts, ts, max_ts, flags);
1000 static int vobsub_read_close(AVFormatContext *s)
1003 MpegDemuxContext *vobsub = s->priv_data;
1005 for (i = 0; i < s->nb_streams; i++)
1006 ff_subtitles_queue_clean(&vobsub->q[i]);
1007 if (vobsub->sub_ctx)
1008 avformat_close_input(&vobsub->sub_ctx);
1012 static const AVOption options[] = {
1013 { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1017 static const AVClass vobsub_demuxer_class = {
1018 .class_name = "vobsub",
1019 .item_name = av_default_item_name,
1021 .version = LIBAVUTIL_VERSION_INT,
1024 AVInputFormat ff_vobsub_demuxer = {
1026 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1027 .priv_data_size = sizeof(MpegDemuxContext),
1028 .read_probe = vobsub_probe,
1029 .read_header = vobsub_read_header,
1030 .read_packet = vobsub_read_packet,
1031 .read_seek2 = vobsub_read_seek,
1032 .read_close = vobsub_read_close,
1033 .flags = AVFMT_SHOW_IDS,
1034 .extensions = "idx",
1035 .priv_class = &vobsub_demuxer_class,