0,0 → 1,949 |
/* |
* 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_EXTENSION / 2; |
|
if(sys>invalid && sys*9 <= pspack*10) |
return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg |
if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9) |
return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .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_EXTENSION + 2 : AVPROBE_SCORE_EXTENSION / 2; |
|
//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; |
int imkh_cctv; |
#if CONFIG_VOBSUB_DEMUXER |
AVFormatContext *sub_ctx; |
FFDemuxSubtitlesQueue q[32]; |
#endif |
} MpegDemuxContext; |
|
static int mpegps_read_header(AVFormatContext *s) |
{ |
MpegDemuxContext *m = s->priv_data; |
char buffer[7]; |
int64_t last_pos = avio_tell(s->pb); |
|
m->header_state = 0xff; |
s->ctx_flags |= AVFMTCTX_NOHEADER; |
|
avio_get_str(s->pb, 6, buffer, sizeof(buffer)); |
if (!memcmp("IMKH", buffer, 4)) { |
m->imkh_cctv = 1; |
} else if (!memcmp("Sofdec", buffer, 6)) { |
m->sofdec = 1; |
} else |
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(m->imkh_cctv && es_type == 0x91){ |
codec_id = AV_CODEC_ID_PCM_MULAW; |
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 { |
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; |
if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) { |
st->codec->channels = 1; |
st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
st->codec->sample_rate = 8000; |
} |
st->request_probe = request_probe; |
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; |
} |
} |
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; |
} |
|
if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) { |
av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n"); |
ret = AVERROR(EINVAL); |
goto end; |
} |
|
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; |
avpriv_set_pts_info(st, 64, 1, 1000); |
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 (!s->nb_streams) { |
av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n"); |
ret = AVERROR_INVALIDDATA; |
goto end; |
} |
|
if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64, |
&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[s->nb_streams - 1], "", 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; |
|
for (i = 0; i < s->nb_streams; i++) { |
vobsub->q[i].sort = SUB_SORT_POS_TS; |
ff_subtitles_queue_finalize(&vobsub->q[i]); |
} |
|
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; |
AVIOContext *pb = vobsub->sub_ctx->pb; |
int ret, psize, total_read = 0, i; |
AVPacket idx_pkt; |
|
int64_t min_ts = INT64_MAX; |
int sid = 0; |
for (i = 0; i < s->nb_streams; i++) { |
FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i]; |
int64_t ts = tmpq->subs[tmpq->current_sub_idx].pts; |
if (ts < min_ts) { |
min_ts = ts; |
sid = i; |
} |
} |
q = &vobsub->q[sid]; |
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; |
int64_t old_pos = avio_tell(pb), new_pos; |
int pkt_size; |
|
ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts); |
if (ret < 0) { |
if (pkt->size) // raise packet even if incomplete |
break; |
FAIL(ret); |
} |
to_read = ret & 0xffff; |
new_pos = avio_tell(pb); |
pkt_size = ret + (new_pos - old_pos); |
|
/* this prevents reads above the current packet */ |
if (total_read + pkt_size > psize) |
break; |
total_read += pkt_size; |
|
/* 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; |
} while (total_read < psize); |
|
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(pkt); |
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; |
|
/* Rescale requested timestamps based on the first stream (timebase is the |
* same for all subtitles stream within a .idx/.sub). Rescaling is done just |
* like in avformat_seek_file(). */ |
if (stream_index == -1 && s->nb_streams != 1) { |
int i, ret = 0; |
AVRational time_base = s->streams[0]->time_base; |
ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base); |
min_ts = av_rescale_rnd(min_ts, time_base.den, |
time_base.num * (int64_t)AV_TIME_BASE, |
AV_ROUND_UP | AV_ROUND_PASS_MINMAX); |
max_ts = av_rescale_rnd(max_ts, time_base.den, |
time_base.num * (int64_t)AV_TIME_BASE, |
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX); |
for (i = 0; i < s->nb_streams; i++) { |
int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index, |
min_ts, ts, max_ts, flags); |
if (r < 0) |
ret = r; |
} |
return ret; |
} |
|
if (stream_index == -1) // only 1 stream |
stream_index = 0; |
return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index, |
min_ts, ts, max_ts, flags); |
} |
|
static int vobsub_read_close(AVFormatContext *s) |
{ |
int i; |
MpegDemuxContext *vobsub = s->priv_data; |
|
for (i = 0; i < s->nb_streams; i++) |
ff_subtitles_queue_clean(&vobsub->q[i]); |
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 |