diff options
Diffstat (limited to 'ffmpeg/libavformat/mpeg.c')
| -rw-r--r-- | ffmpeg/libavformat/mpeg.c | 912 |
1 files changed, 912 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/mpeg.c b/ffmpeg/libavformat/mpeg.c new file mode 100644 index 0000000..f36f0db --- /dev/null +++ b/ffmpeg/libavformat/mpeg.c @@ -0,0 +1,912 @@ +/* + * MPEG1/2 demuxer + * Copyright (c) 2000, 2001, 2002 Fabrice Bellard + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avformat.h" +#include "internal.h" +#include "mpeg.h" + +#if CONFIG_VOBSUB_DEMUXER +# include "subtitles.h" +# include "libavutil/bprint.h" +#endif + +#undef NDEBUG +#include <assert.h> +#include "libavutil/avassert.h" + +/*********************************************/ +/* demux code */ + +#define MAX_SYNC_SIZE 100000 + +static int check_pes(const uint8_t *p, const uint8_t *end){ + int pes1; + int pes2= (p[3] & 0xC0) == 0x80 + && (p[4] & 0xC0) != 0x40 + &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0)); + + for(p+=3; p<end && *p == 0xFF; p++); + if((*p&0xC0) == 0x40) p+=2; + if((*p&0xF0) == 0x20){ + pes1= p[0]&p[2]&p[4]&1; + }else if((*p&0xF0) == 0x30){ + pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1; + }else + pes1 = *p == 0x0F; + + return pes1||pes2; +} + +static int check_pack_header(const uint8_t *buf) { + return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20; +} + +static int mpegps_probe(AVProbeData *p) +{ + uint32_t code= -1; + int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0; + int i; + int score=0; + + for(i=0; i<p->buf_size; i++){ + code = (code<<8) + p->buf[i]; + if ((code & 0xffffff00) == 0x100) { + int len= p->buf[i+1] << 8 | p->buf[i+2]; + int pes= check_pes(p->buf+i, p->buf+p->buf_size); + int pack = check_pack_header(p->buf+i); + + if(code == SYSTEM_HEADER_START_CODE) sys++; + else if(code == PACK_START_CODE && pack) pspack++; + else if((code & 0xf0) == VIDEO_ID && pes) vid++; + // skip pes payload to avoid start code emulation for private + // and audio streams + else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;} + else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;} + else if(code == 0x1fd && pes) vid++; //VC1 + + else if((code & 0xf0) == VIDEO_ID && !pes) invalid++; + else if((code & 0xe0) == AUDIO_ID && !pes) invalid++; + else if(code == PRIVATE_STREAM_1 && !pes) invalid++; + } + } + + if(vid+audio > invalid+1) /* invalid VDR files nd short PES streams */ + score= AVPROBE_SCORE_MAX/4; + + if(sys>invalid && sys*9 <= pspack*10) + return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg + if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9) + return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg + if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */ + return (audio > 12 || vid > 3 + 2*invalid) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; + + //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1 + //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6 + //Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618 + return score; +} + + +typedef struct MpegDemuxContext { + int32_t header_state; + unsigned char psm_es_type[256]; + int sofdec; + int dvd; +#if CONFIG_VOBSUB_DEMUXER + AVFormatContext *sub_ctx; + FFDemuxSubtitlesQueue q; +#endif +} MpegDemuxContext; + +static int mpegps_read_header(AVFormatContext *s) +{ + MpegDemuxContext *m = s->priv_data; + const char *sofdec = "Sofdec"; + int v, i = 0; + int64_t last_pos = avio_tell(s->pb); + + m->header_state = 0xff; + s->ctx_flags |= AVFMTCTX_NOHEADER; + + m->sofdec = -1; + do { + v = avio_r8(s->pb); + m->sofdec++; + } while (v == sofdec[i] && i++ < 6); + + m->sofdec = (m->sofdec == 6) ? 1 : 0; + + if (!m->sofdec) + avio_seek(s->pb, last_pos, SEEK_SET); + + /* no need to do more */ + return 0; +} + +static int64_t get_pts(AVIOContext *pb, int c) +{ + uint8_t buf[5]; + + buf[0] = c<0 ? avio_r8(pb) : c; + avio_read(pb, buf+1, 4); + + return ff_parse_pes_pts(buf); +} + +static int find_next_start_code(AVIOContext *pb, int *size_ptr, + int32_t *header_state) +{ + unsigned int state, v; + int val, n; + + state = *header_state; + n = *size_ptr; + while (n > 0) { + if (url_feof(pb)) + break; + v = avio_r8(pb); + n--; + if (state == 0x000001) { + state = ((state << 8) | v) & 0xffffff; + val = state; + goto found; + } + state = ((state << 8) | v) & 0xffffff; + } + val = -1; + found: + *header_state = state; + *size_ptr = n; + return val; +} + +/** + * Extract stream types from a program stream map + * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35 + * + * @return number of bytes occupied by PSM in the bitstream + */ +static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb) +{ + int psm_length, ps_info_length, es_map_length; + + psm_length = avio_rb16(pb); + avio_r8(pb); + avio_r8(pb); + ps_info_length = avio_rb16(pb); + + /* skip program_stream_info */ + avio_skip(pb, ps_info_length); + es_map_length = avio_rb16(pb); + + /* at least one es available? */ + while (es_map_length >= 4){ + unsigned char type = avio_r8(pb); + unsigned char es_id = avio_r8(pb); + uint16_t es_info_length = avio_rb16(pb); + /* remember mapping from stream id to stream type */ + m->psm_es_type[es_id] = type; + /* skip program_stream_info */ + avio_skip(pb, es_info_length); + es_map_length -= 4 + es_info_length; + } + avio_rb32(pb); /* crc32 */ + return 2 + psm_length; +} + +/* read the next PES header. Return its position in ppos + (if not NULL), and its start code, pts and dts. + */ +static int mpegps_read_pes_header(AVFormatContext *s, + int64_t *ppos, int *pstart_code, + int64_t *ppts, int64_t *pdts) +{ + MpegDemuxContext *m = s->priv_data; + int len, size, startcode, c, flags, header_len; + int pes_ext, ext2_len, id_ext, skip; + int64_t pts, dts; + int64_t last_sync= avio_tell(s->pb); + + error_redo: + avio_seek(s->pb, last_sync, SEEK_SET); + redo: + /* next start code (should be immediately after) */ + m->header_state = 0xff; + size = MAX_SYNC_SIZE; + startcode = find_next_start_code(s->pb, &size, &m->header_state); + last_sync = avio_tell(s->pb); + if (startcode < 0){ + if(url_feof(s->pb)) + return AVERROR_EOF; + //FIXME we should remember header_state + return AVERROR(EAGAIN); + } + + if (startcode == PACK_START_CODE) + goto redo; + if (startcode == SYSTEM_HEADER_START_CODE) + goto redo; + if (startcode == PADDING_STREAM) { + avio_skip(s->pb, avio_rb16(s->pb)); + goto redo; + } + if (startcode == PRIVATE_STREAM_2) { + if (!m->sofdec) { + /* Need to detect whether this from a DVD or a 'Sofdec' stream */ + int len = avio_rb16(s->pb); + int bytesread = 0; + uint8_t *ps2buf = av_malloc(len); + + if (ps2buf) { + bytesread = avio_read(s->pb, ps2buf, len); + + if (bytesread != len) { + avio_skip(s->pb, len - bytesread); + } else { + uint8_t *p = 0; + if (len >= 6) + p = memchr(ps2buf, 'S', len - 5); + + if (p) + m->sofdec = !memcmp(p+1, "ofdec", 5); + + m->sofdec -= !m->sofdec; + + if (m->sofdec < 0) { + if (len == 980 && ps2buf[0] == 0) { + /* PCI structure? */ + uint32_t startpts = AV_RB32(ps2buf + 0x0d); + uint32_t endpts = AV_RB32(ps2buf + 0x11); + uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f); + uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f); + uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f); + + m->dvd = (hours <= 23 && + mins <= 59 && + secs <= 59 && + (ps2buf[0x19] & 0x0f) < 10 && + (ps2buf[0x1a] & 0x0f) < 10 && + (ps2buf[0x1b] & 0x0f) < 10 && + endpts >= startpts); + } else if (len == 1018 && ps2buf[0] == 1) { + /* DSI structure? */ + uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f); + uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f); + uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f); + + m->dvd = (hours <= 23 && + mins <= 59 && + secs <= 59 && + (ps2buf[0x1d] & 0x0f) < 10 && + (ps2buf[0x1e] & 0x0f) < 10 && + (ps2buf[0x1f] & 0x0f) < 10); + } + } + } + + av_free(ps2buf); + + /* If this isn't a DVD packet or no memory + * could be allocated, just ignore it. + * If we did, move back to the start of the + * packet (plus 'length' field) */ + if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) { + /* Skip back failed. + * This packet will be lost but that can't be helped + * if we can't skip back + */ + goto redo; + } + } else { + /* No memory */ + avio_skip(s->pb, len); + goto redo; + } + } else if (!m->dvd) { + int len = avio_rb16(s->pb); + avio_skip(s->pb, len); + goto redo; + } + } + if (startcode == PROGRAM_STREAM_MAP) { + mpegps_psm_parse(m, s->pb); + goto redo; + } + + /* find matching stream */ + if (!((startcode >= 0x1c0 && startcode <= 0x1df) || + (startcode >= 0x1e0 && startcode <= 0x1ef) || + (startcode == 0x1bd) || + (startcode == PRIVATE_STREAM_2) || + (startcode == 0x1fd))) + goto redo; + if (ppos) { + *ppos = avio_tell(s->pb) - 4; + } + len = avio_rb16(s->pb); + pts = + dts = AV_NOPTS_VALUE; + if (startcode != PRIVATE_STREAM_2) + { + /* stuffing */ + for(;;) { + if (len < 1) + goto error_redo; + c = avio_r8(s->pb); + len--; + /* XXX: for mpeg1, should test only bit 7 */ + if (c != 0xff) + break; + } + if ((c & 0xc0) == 0x40) { + /* buffer scale & size */ + avio_r8(s->pb); + c = avio_r8(s->pb); + len -= 2; + } + if ((c & 0xe0) == 0x20) { + dts = pts = get_pts(s->pb, c); + len -= 4; + if (c & 0x10){ + dts = get_pts(s->pb, -1); + len -= 5; + } + } else if ((c & 0xc0) == 0x80) { + /* mpeg 2 PES */ + flags = avio_r8(s->pb); + header_len = avio_r8(s->pb); + len -= 2; + if (header_len > len) + goto error_redo; + len -= header_len; + if (flags & 0x80) { + dts = pts = get_pts(s->pb, -1); + header_len -= 5; + if (flags & 0x40) { + dts = get_pts(s->pb, -1); + header_len -= 5; + } + } + if (flags & 0x3f && header_len == 0){ + flags &= 0xC0; + av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n"); + } + if (flags & 0x01) { /* PES extension */ + pes_ext = avio_r8(s->pb); + header_len--; + /* Skip PES private data, program packet sequence counter and P-STD buffer */ + skip = (pes_ext >> 4) & 0xb; + skip += skip & 0x9; + if (pes_ext & 0x40 || skip > header_len){ + av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext); + pes_ext=skip=0; + } + avio_skip(s->pb, skip); + header_len -= skip; + + if (pes_ext & 0x01) { /* PES extension 2 */ + ext2_len = avio_r8(s->pb); + header_len--; + if ((ext2_len & 0x7f) > 0) { + id_ext = avio_r8(s->pb); + if ((id_ext & 0x80) == 0) + startcode = ((startcode & 0xff) << 8) | id_ext; + header_len--; + } + } + } + if(header_len < 0) + goto error_redo; + avio_skip(s->pb, header_len); + } + else if( c!= 0xf ) + goto redo; + } + + if (startcode == PRIVATE_STREAM_1) { + startcode = avio_r8(s->pb); + len--; + } + if(len<0) + goto error_redo; + if(dts != AV_NOPTS_VALUE && ppos){ + int i; + for(i=0; i<s->nb_streams; i++){ + if(startcode == s->streams[i]->id && + s->pb->seekable /* index useless on streams anyway */) { + ff_reduce_index(s, i); + av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */); + } + } + } + + *pstart_code = startcode; + *ppts = pts; + *pdts = dts; + return len; +} + +static int mpegps_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + MpegDemuxContext *m = s->priv_data; + AVStream *st; + int len, startcode, i, es_type, ret; + int lpcm_header_len = -1; //Init to supress warning + int request_probe= 0; + enum AVCodecID codec_id = AV_CODEC_ID_NONE; + enum AVMediaType type; + int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work + + redo: + len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts); + if (len < 0) + return len; + + if (startcode >= 0x80 && startcode <= 0xcf) { + if(len < 4) + goto skip; + + /* audio: skip header */ + avio_r8(s->pb); + lpcm_header_len = avio_rb16(s->pb); + len -= 3; + if (startcode >= 0xb0 && startcode <= 0xbf) { + /* MLP/TrueHD audio has a 4-byte header */ + avio_r8(s->pb); + len--; + } + } + + /* now find stream */ + for(i=0;i<s->nb_streams;i++) { + st = s->streams[i]; + if (st->id == startcode) + goto found; + } + + es_type = m->psm_es_type[startcode & 0xff]; + if(es_type == STREAM_TYPE_VIDEO_MPEG1){ + codec_id = AV_CODEC_ID_MPEG2VIDEO; + type = AVMEDIA_TYPE_VIDEO; + } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){ + codec_id = AV_CODEC_ID_MPEG2VIDEO; + type = AVMEDIA_TYPE_VIDEO; + } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 || + es_type == STREAM_TYPE_AUDIO_MPEG2){ + codec_id = AV_CODEC_ID_MP3; + type = AVMEDIA_TYPE_AUDIO; + } else if(es_type == STREAM_TYPE_AUDIO_AAC){ + codec_id = AV_CODEC_ID_AAC; + type = AVMEDIA_TYPE_AUDIO; + } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){ + codec_id = AV_CODEC_ID_MPEG4; + type = AVMEDIA_TYPE_VIDEO; + } else if(es_type == STREAM_TYPE_VIDEO_H264){ + codec_id = AV_CODEC_ID_H264; + type = AVMEDIA_TYPE_VIDEO; + } else if(es_type == STREAM_TYPE_AUDIO_AC3){ + codec_id = AV_CODEC_ID_AC3; + type = AVMEDIA_TYPE_AUDIO; + } else if (startcode >= 0x1e0 && startcode <= 0x1ef) { + static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 }; + unsigned char buf[8]; + avio_read(s->pb, buf, 8); + avio_seek(s->pb, -8, SEEK_CUR); + if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1)) + codec_id = AV_CODEC_ID_CAVS; + else + request_probe= 1; + type = AVMEDIA_TYPE_VIDEO; + } else if (startcode == PRIVATE_STREAM_2) { + type = AVMEDIA_TYPE_DATA; + codec_id = AV_CODEC_ID_DVD_NAV; + } else if (startcode >= 0x1c0 && startcode <= 0x1df) { + type = AVMEDIA_TYPE_AUDIO; + codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2; + } else if (startcode >= 0x80 && startcode <= 0x87) { + type = AVMEDIA_TYPE_AUDIO; + codec_id = AV_CODEC_ID_AC3; + } else if ( ( startcode >= 0x88 && startcode <= 0x8f) + ||( startcode >= 0x98 && startcode <= 0x9f)) { + /* 0x90 - 0x97 is reserved for SDDS in DVD specs */ + type = AVMEDIA_TYPE_AUDIO; + codec_id = AV_CODEC_ID_DTS; + } else if (startcode >= 0xa0 && startcode <= 0xaf) { + type = AVMEDIA_TYPE_AUDIO; + if(lpcm_header_len == 6) { + codec_id = AV_CODEC_ID_MLP; + } else { + /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */ + codec_id = AV_CODEC_ID_PCM_DVD; + } + } else if (startcode >= 0xb0 && startcode <= 0xbf) { + type = AVMEDIA_TYPE_AUDIO; + codec_id = AV_CODEC_ID_TRUEHD; + } else if (startcode >= 0xc0 && startcode <= 0xcf) { + /* Used for both AC-3 and E-AC-3 in EVOB files */ + type = AVMEDIA_TYPE_AUDIO; + codec_id = AV_CODEC_ID_AC3; + } else if (startcode >= 0x20 && startcode <= 0x3f) { + type = AVMEDIA_TYPE_SUBTITLE; + codec_id = AV_CODEC_ID_DVD_SUBTITLE; + } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) { + type = AVMEDIA_TYPE_VIDEO; + codec_id = AV_CODEC_ID_VC1; + } else { + skip: + /* skip packet */ + avio_skip(s->pb, len); + goto redo; + } + /* no stream found: add a new stream */ + st = avformat_new_stream(s, NULL); + if (!st) + goto skip; + st->id = startcode; + st->codec->codec_type = type; + st->codec->codec_id = codec_id; + st->request_probe = request_probe; + if (codec_id != AV_CODEC_ID_PCM_S16BE) + st->need_parsing = AVSTREAM_PARSE_FULL; + found: + if(st->discard >= AVDISCARD_ALL) + goto skip; + if (startcode >= 0xa0 && startcode <= 0xaf) { + if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) { + if (len < 6) + goto skip; + avio_skip(s->pb, 6); + len -=6; + } else { + int b1, freq; + + /* for LPCM, we just skip the header and consider it is raw + audio data */ + if (len <= 3) + goto skip; + avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */ + b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */ + avio_r8(s->pb); /* dynamic range control (0x80 = off) */ + len -= 3; + freq = (b1 >> 4) & 3; + st->codec->sample_rate = lpcm_freq_tab[freq]; + st->codec->channels = 1 + (b1 & 7); + st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4; + st->codec->bit_rate = st->codec->channels * + st->codec->sample_rate * + st->codec->bits_per_coded_sample; + if (st->codec->bits_per_coded_sample == 16) + st->codec->codec_id = AV_CODEC_ID_PCM_S16BE; + else if (st->codec->bits_per_coded_sample == 28) + return AVERROR(EINVAL); + } + } + ret = av_get_packet(s->pb, pkt, len); + pkt->pts = pts; + pkt->dts = dts; + pkt->pos = dummy_pos; + pkt->stream_index = st->index; + av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n", + pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, + pkt->size); + + return (ret < 0) ? ret : 0; +} + +static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, + int64_t *ppos, int64_t pos_limit) +{ + int len, startcode; + int64_t pos, pts, dts; + + pos = *ppos; + if (avio_seek(s->pb, pos, SEEK_SET) < 0) + return AV_NOPTS_VALUE; + + for(;;) { + len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts); + if (len < 0) { + av_dlog(s, "none (ret=%d)\n", len); + return AV_NOPTS_VALUE; + } + if (startcode == s->streams[stream_index]->id && + dts != AV_NOPTS_VALUE) { + break; + } + avio_skip(s->pb, len); + } + av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", + pos, dts, dts / 90000.0); + *ppos = pos; + return dts; +} + +AVInputFormat ff_mpegps_demuxer = { + .name = "mpeg", + .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"), + .priv_data_size = sizeof(MpegDemuxContext), + .read_probe = mpegps_probe, + .read_header = mpegps_read_header, + .read_packet = mpegps_read_packet, + .read_timestamp = mpegps_read_dts, + .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, +}; + +#if CONFIG_VOBSUB_DEMUXER + +#define REF_STRING "# VobSub index file," + +static int vobsub_probe(AVProbeData *p) +{ + if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1)) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int vobsub_read_header(AVFormatContext *s) +{ + int i, ret = 0, header_parsed = 0, langidx = 0; + MpegDemuxContext *vobsub = s->priv_data; + char *sub_name = NULL; + size_t fname_len; + char *ext, *header_str; + AVBPrint header; + int64_t delay = 0; + AVStream *st = NULL; + + sub_name = av_strdup(s->filename); + fname_len = strlen(sub_name); + ext = sub_name - 3 + fname_len; + if (fname_len < 4 || *(ext - 1) != '.') { + av_log(s, AV_LOG_ERROR, "The input index filename is too short " + "to guess the associated .SUB file\n"); + ret = AVERROR_INVALIDDATA; + goto end; + } + memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3); + av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name); + ret = avformat_open_input(&vobsub->sub_ctx, sub_name, &ff_mpegps_demuxer, NULL); + if (ret < 0) { + av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name); + goto end; + } + + av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); + while (!url_feof(s->pb)) { + char line[2048]; + int len = ff_get_line(s->pb, line, sizeof(line)); + + if (!len) + break; + + line[strcspn(line, "\r\n")] = 0; + + if (!strncmp(line, "id:", 3)) { + int n, stream_id = 0; + char id[64] = {0}; + + n = sscanf(line, "id: %63[^,], index: %u", id, &stream_id); + if (n != 2) { + av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', " + "assuming 'id: und, index: 0'\n", line); + strcpy(id, "und"); + stream_id = 0; + } + + st = avformat_new_stream(s, NULL); + if (!st) { + ret = AVERROR(ENOMEM); + goto end; + } + st->id = stream_id; + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE; + av_dict_set(&st->metadata, "language", id, 0); + av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id); + header_parsed = 1; + + } else if (st && !strncmp(line, "timestamp:", 10)) { + AVPacket *sub; + int hh, mm, ss, ms; + int64_t pos, timestamp; + const char *p = line + 10; + + if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"PRIx64, + &hh, &mm, &ss, &ms, &pos) != 5) { + av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', " + "abort parsing\n", line); + break; + } + timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay; + timestamp = av_rescale_q(timestamp, (AVRational){1,1000}, st->time_base); + + sub = ff_subtitles_queue_insert(&vobsub->q, "", 0, 0); + if (!sub) { + ret = AVERROR(ENOMEM); + goto end; + } + sub->pos = pos; + sub->pts = timestamp; + sub->stream_index = s->nb_streams - 1; + + } else if (st && !strncmp(line, "alt:", 4)) { + const char *p = line + 4; + + while (*p == ' ') + p++; + av_dict_set(&st->metadata, "title", p, 0); + av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", st->id, p); + header_parsed = 1; + + } else if (!strncmp(line, "delay:", 6)) { + int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0; + const char *p = line + 6; + + while (*p == ' ') + p++; + if (*p == '-' || *p == '+') { + sign = *p == '-' ? -1 : 1; + p++; + } + sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms); + delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign; + + } else if (!strncmp(line, "langidx:", 8)) { + const char *p = line + 8; + + if (sscanf(p, "%d", &langidx) != 1) + av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n"); + + } else if (!header_parsed) { + if (line[0] && line[0] != '#') + av_bprintf(&header, "%s\n", line); + } + } + + if (langidx < s->nb_streams) + s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT; + + ff_subtitles_queue_finalize(&vobsub->q); + + if (!av_bprint_is_complete(&header)) { + av_bprint_finalize(&header, NULL); + ret = AVERROR(ENOMEM); + goto end; + } + av_bprint_finalize(&header, &header_str); + for (i = 0; i < s->nb_streams; i++) { + AVStream *sub_st = s->streams[i]; + sub_st->codec->extradata = av_strdup(header_str); + sub_st->codec->extradata_size = header.len; + } + av_free(header_str); + +end: + av_free(sub_name); + return ret; +} + +#define FAIL(r) do { ret = r; goto fail; } while (0) + +static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + MpegDemuxContext *vobsub = s->priv_data; + FFDemuxSubtitlesQueue *q = &vobsub->q; + AVIOContext *pb = vobsub->sub_ctx->pb; + int ret, psize, len16 = -1; + AVPacket idx_pkt; + + ret = ff_subtitles_queue_read_packet(q, &idx_pkt); + if (ret < 0) + return ret; + + /* compute maximum packet size using the next packet position. This is + * useful when the len in the header is non-sense */ + if (q->current_sub_idx < q->nb_subs) { + psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos; + } else { + int64_t fsize = avio_size(pb); + psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos; + } + + avio_seek(pb, idx_pkt.pos, SEEK_SET); + + av_init_packet(pkt); + pkt->size = 0; + pkt->data = NULL; + + do { + int n, to_read, startcode; + int64_t pts, dts; + + ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts); + if (ret < 0) + FAIL(ret); + to_read = ret & 0xffff; + + /* this prevents reads above the current packet */ + if (pkt->size + to_read > psize) + break; + + /* if the len is computed, we check for overread */ + if (len16 != -1 && pkt->size + to_read > len16) + break; + + /* the current chunk doesn't match the stream index (unlikely) */ + if ((startcode & 0x1f) != idx_pkt.stream_index) + break; + + ret = av_grow_packet(pkt, to_read); + if (ret < 0) + FAIL(ret); + + n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read); + if (n < to_read) + pkt->size -= to_read - n; + + /* first chunk contains the total len of the packet to raise */ + if (len16 == -1 && n > 2) + len16 = AV_RB16(pkt->data); + } while (len16 != -1 && pkt->size != len16); + + pkt->pts = pkt->dts = idx_pkt.pts; + pkt->pos = idx_pkt.pos; + pkt->stream_index = idx_pkt.stream_index; + + av_free_packet(&idx_pkt); + return 0; + +fail: + av_free_packet(&idx_pkt); + return ret; +} + +static int vobsub_read_seek(AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +{ + MpegDemuxContext *vobsub = s->priv_data; + return ff_subtitles_queue_seek(&vobsub->q, s, stream_index, + min_ts, ts, max_ts, flags); +} + +static int vobsub_read_close(AVFormatContext *s) +{ + MpegDemuxContext *vobsub = s->priv_data; + ff_subtitles_queue_clean(&vobsub->q); + if (vobsub->sub_ctx) + avformat_close_input(&vobsub->sub_ctx); + return 0; +} + +AVInputFormat ff_vobsub_demuxer = { + .name = "vobsub", + .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"), + .priv_data_size = sizeof(MpegDemuxContext), + .read_probe = vobsub_probe, + .read_header = vobsub_read_header, + .read_packet = vobsub_read_packet, + .read_seek2 = vobsub_read_seek, + .read_close = vobsub_read_close, + .flags = AVFMT_SHOW_IDS, + .extensions = "idx", +}; +#endif |