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mpv/libmpdemux/demux_ty.c

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/*
* tivo@wingert.org, February 2003
*
* Copyright (C) 2003 Christopher R. Wingert
*
* The license covers the portions of this file regarding TiVo additions.
*
* Olaf Beck and Tridge (indirectly) were essential at providing
* information regarding the format of the TiVo streams.
*
* However, no code in the following subsection is directly copied from
* either author.
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <stdarg.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "parse_es.h"
#include "stheader.h"
#include "sub_cc.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
extern void skip_audio_frame( sh_audio_t *sh_audio );
extern int sub_justify;
// 2/c0: audio data
// 3/c0: audio packet header (PES header)
// 4/c0: audio data (S/A only?)
// 9/c0: audio packet header, AC-3 audio
// 2/e0: video data
// 6/e0: video packet header (PES header)
// 7/e0: video sequence header start
// 8/e0: video I-frame header start
// a/e0: video P-frame header start
// b/e0: video B-frame header start
// c/e0: video GOP header start
// e/01: closed-caption data
// e/02: Extended data services data
#define TIVO_PES_FILEID 0xf5467abd
#define TIVO_PART_LENGTH 0x20000000
#define CHUNKSIZE ( 128 * 1024 )
#define MAX_AUDIO_BUFFER ( 16 * 1024 )
#define TY_V 1
#define TY_A 2
typedef struct
{
off_t startOffset;
off_t fileSize;
int chunks;
} tmf_fileParts;
#define MAX_TMF_PARTS 16
typedef struct
{
int whichChunk;
unsigned char lastAudio[ MAX_AUDIO_BUFFER ];
int lastAudioEnd;
int tivoType; // 1 = SA, 2 = DTiVo
int64_t lastAudioPTS;
int64_t lastVideoPTS;
off_t size;
int readHeader;
int tmf;
tmf_fileParts tmfparts[ MAX_TMF_PARTS ];
int tmf_totalparts;
} TiVoInfo;
off_t vstream_streamsize( );
void ty_ClearOSD( int start );
// ===========================================================================
#define TMF_SIG "showing.xml"
// ===========================================================================
static int ty_tmf_filetoparts( demuxer_t *demux, TiVoInfo *tivo )
{
int parts = 0;
stream_seek(demux->stream, 0);
mp_msg( MSGT_DEMUX, MSGL_DBG3, "Dumping tar contents\n" );
while (!demux->stream->eof)
{
char header[ 512 ];
char *name;
char *extension;
char *sizestr;
int size;
off_t skip;
if (stream_read(demux->stream, header, 512) < 512)
{
mp_msg( MSGT_DEMUX, MSGL_DBG3, "Read bad\n" );
break;
}
name = header;
name[99] = 0;
sizestr = &header[124];
sizestr[11] = 0;
size = strtol(sizestr, NULL, 8);
mp_msg( MSGT_DEMUX, MSGL_DBG3, "name %-20.20s size %-12.12s %d\n",
name, sizestr, size );
extension = strrchr(name, '.');
if (extension && strcmp(extension, ".ty") == 0)
{
if ( parts >= MAX_TMF_PARTS ) {
mp_msg( MSGT_DEMUX, MSGL_ERR, "ty:tmf too big\n" );
break;
}
tivo->tmfparts[ parts ].fileSize = size;
tivo->tmfparts[ parts ].startOffset = stream_tell(demux->stream);
tivo->tmfparts[ parts ].chunks = size / CHUNKSIZE;
mp_msg(MSGT_DEMUX, MSGL_DBG3,
"tmf_filetoparts(): index %d, chunks %d\n"
"tmf_filetoparts(): size %"PRId64"\n"
"tmf_filetoparts(): startOffset %"PRId64"\n",
parts, tivo->tmfparts[ parts ].chunks,
tivo->tmfparts[ parts ].fileSize, tivo->tmfparts[ parts ].startOffset
);
parts++;
}
// size rounded up to blocks
skip = (size + 511) & ~511;
stream_skip(demux->stream, skip);
}
stream_reset(demux->stream);
tivo->tmf_totalparts = parts;
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"tmf_filetoparts(): No More Part Files %d\n", parts );
return 1;
}
// ===========================================================================
static off_t tmf_filetooffset(TiVoInfo *tivo, int chunk)
{
int i;
for (i = 0; i < tivo->tmf_totalparts; i++) {
if (chunk < tivo->tmfparts[i].chunks)
return tivo->tmfparts[i].startOffset + chunk * CHUNKSIZE;
chunk -= tivo->tmfparts[i].chunks;
}
return -1;
}
// ===========================================================================
static int tmf_load_chunk( demuxer_t *demux, TiVoInfo *tivo,
unsigned char *buff, int readChunk )
{
off_t fileoffset;
int count;
mp_msg( MSGT_DEMUX, MSGL_DBG3, "\ntmf_load_chunk() begin %d\n",
readChunk );
fileoffset = tmf_filetooffset(tivo, readChunk);
if (fileoffset == -1 || !stream_seek(demux->stream, fileoffset)) {
mp_msg( MSGT_DEMUX, MSGL_ERR, "Read past EOF()\n" );
return 0;
}
count = stream_read( demux->stream, buff, CHUNKSIZE );
demux->filepos = stream_tell( demux->stream );
mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() count %x\n",
count );
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"tmf_load_chunk() bytes %x %x %x %x %x %x %x %x\n",
buff[ 0 ], buff[ 1 ], buff[ 2 ], buff[ 3 ],
buff[ 4 ], buff[ 5 ], buff[ 6 ], buff[ 7 ] );
mp_msg( MSGT_DEMUX, MSGL_DBG3, "tmf_load_chunk() end\n" );
return count;
}
// ===========================================================================
// DTiVo MPEG 336, 480, 576, 768
// SA TiVo 864
// DTiVo AC-3 1550
//
#define SERIES1_PTS_LENGTH 11
#define SERIES1_PTS_OFFSET 6
#define SERIES2_PTS_LENGTH 16
#define SERIES2_PTS_OFFSET 9
#define AC3_PTS_LENGTH 16
#define AC3_PTS_OFFSET 9
static int IsValidAudioPacket( int size, int *ptsOffset, int *ptsLen )
{
// AC-3
if ( size == 1550 || size == 1552 )
{
*ptsOffset = AC3_PTS_OFFSET;
*ptsLen = AC3_PTS_LENGTH;
return 1;
}
// MPEG
if ( (size & 15) == (SERIES1_PTS_LENGTH & 15) )
{
*ptsOffset = SERIES1_PTS_OFFSET;
*ptsLen = SERIES1_PTS_LENGTH;
return 1;
}
if ( (size & 15) == (SERIES2_PTS_LENGTH & 15) )
{
*ptsOffset = SERIES2_PTS_OFFSET;
*ptsLen = SERIES2_PTS_LENGTH;
return 1;
}
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Tossing Audio Packet Size %d\n",
size );
return 0;
}
static int64_t get_ty_pts( unsigned char *buf )
{
int a = buf[0] & 0xe;
int b = AV_RB16(buf + 1);
int c = AV_RB16(buf + 3);
if (!(1 & a & b & c)) // invalid MPEG timestamp
return MP_NOPTS_VALUE;
a >>= 1; b >>= 1; c >>= 1;
return (((uint64_t)a) << 30) | (b << 15) | c;
}
static void demux_ty_AddToAudioBuffer( TiVoInfo *tivo, unsigned char *buffer,
int size )
{
if ( tivo->lastAudioEnd + size < MAX_AUDIO_BUFFER )
{
memcpy( &tivo->lastAudio[ tivo->lastAudioEnd ],
buffer, size );
tivo->lastAudioEnd += size;
}
else
mp_msg( MSGT_DEMUX, MSGL_ERR,
"ty:WARNING - Would have blown my audio buffer\n" );
}
static void demux_ty_CopyToDemuxPacket( demux_stream_t *ds,
unsigned char *buffer, int size, off_t pos, int64_t pts )
{
demux_packet_t *dp = new_demux_packet( size );
memcpy( dp->buffer, buffer, size );
if (pts != MP_NOPTS_VALUE)
dp->pts = pts / 90000.0;
dp->pos = pos;
dp->flags = 0;
ds_add_packet( ds, dp );
}
static int demux_ty_FindESHeader( uint8_t nal,
unsigned char *buffer, int bufferSize )
{
uint32_t search = 0x00000100 | nal;
uint32_t found = -1;
uint8_t *p = buffer;
uint8_t *end = p + bufferSize;
while (p < end) {
found <<= 8;
found |= *p++;
if (found == search)
return p - buffer - 4;
}
return -1;
}
static void demux_ty_FindESPacket( uint8_t nal,
unsigned char *buffer, int bufferSize, int *esOffset1, int *esOffset2 )
{
*esOffset1 = demux_ty_FindESHeader(nal, buffer, bufferSize);
if (*esOffset1 == -1) {
*esOffset2 = -1;
return;
}
buffer += *esOffset1 + 1;
bufferSize -= *esOffset1 + 1;
*esOffset2 = demux_ty_FindESHeader(nal, buffer, bufferSize);
if (*esOffset2 != -1)
*esOffset2 += *esOffset1 + 1;
}
#define VIDEO_NAL 0xe0
#define AUDIO_NAL 0xc0
#define AC3_NAL 0xbd
static int demux_ty_fill_buffer( demuxer_t *demux, demux_stream_t *dsds )
{
int invalidType = 0;
int errorHeader = 0;
int recordsDecoded = 0;
unsigned char chunk[ CHUNKSIZE ];
int readSize;
int numberRecs;
unsigned char *recPtr;
int offset;
int counter;
int aid;
TiVoInfo *tivo = demux->priv;
if ( demux->stream->type == STREAMTYPE_DVD )
return 0;
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty processing\n" );
if( demux->stream->eof ) return 0;
// ======================================================================
// If we haven't figured out the size of the stream, let's do so
// ======================================================================
#ifdef STREAMTYPE_STREAM_TY
if ( demux->stream->type == STREAMTYPE_STREAM_TY )
{
// The vstream code figures out the exact size of the stream
demux->movi_start = 0;
demux->movi_end = vstream_streamsize();
tivo->size = vstream_streamsize();
}
else
#endif
{
// If its a local file, try to find the Part Headers, so we can
// calculate the ACTUAL stream size
// If we can't find it, go off with the file size and hope the
// extract program did the "right thing"
if ( tivo->readHeader == 0 )
{
off_t filePos;
tivo->readHeader = 1;
filePos = demux->filepos;
stream_seek( demux->stream, 0 );
readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
if ( memcmp( chunk, TMF_SIG, sizeof( TMF_SIG ) ) == 0 )
{
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Detected a tmf\n" );
tivo->tmf = 1;
ty_tmf_filetoparts( demux, tivo );
readSize = tmf_load_chunk( demux, tivo, chunk, 0 );
}
if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
{
off_t numberParts;
readSize = 0;
if ( tivo->tmf != 1 )
{
off_t offset;
numberParts = demux->stream->end_pos / TIVO_PART_LENGTH;
offset = numberParts * TIVO_PART_LENGTH;
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty/ty+Number Parts %"PRId64"\n",
(int64_t)numberParts );
if ( offset + CHUNKSIZE < demux->stream->end_pos )
{
stream_seek( demux->stream, offset );
readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
}
}
else
{
numberParts = tivo->tmf_totalparts;
offset = numberParts * TIVO_PART_LENGTH;
readSize = tmf_load_chunk( demux, tivo, chunk,
numberParts * ( TIVO_PART_LENGTH - CHUNKSIZE ) /
CHUNKSIZE );
}
if ( readSize == CHUNKSIZE && AV_RB32(chunk) == TIVO_PES_FILEID )
{
int size = AV_RB24(chunk + 12);
size -= 4;
size *= CHUNKSIZE;
tivo->size = numberParts * TIVO_PART_LENGTH;
tivo->size += size;
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:Header Calc Stream Size %"PRId64"\n", tivo->size );
}
}
if ( demux->stream->start_pos > 0 )
filePos = demux->stream->start_pos;
stream_seek( demux->stream, filePos );
demux->filepos = stream_tell( demux->stream );
tivo->whichChunk = filePos / CHUNKSIZE;
}
demux->movi_start = 0;
demux->movi_end = tivo->size;
}
// ======================================================================
// Give a clue as to where we are in the stream
// ======================================================================
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:ty header size %"PRIx64"\n", (int64_t)tivo->size );
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:ty which Chunk %d\n", tivo->whichChunk );
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:file end_pos %"PRIx64"\n", (int64_t)demux->stream->end_pos );
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"\nty:wanted current offset %"PRIx64"\n", (int64_t)stream_tell( demux->stream ) );
if ( tivo->size > 0 && stream_tell( demux->stream ) > tivo->size )
{
demux->stream->eof = 1;
return 0;
}
do {
if ( tivo->tmf != 1 )
{
// Make sure we are on a 128k boundary
if ( demux->filepos % CHUNKSIZE != 0 )
{
int whichChunk = demux->filepos / CHUNKSIZE;
if ( demux->filepos % CHUNKSIZE > CHUNKSIZE / 2 )
whichChunk++;
stream_seek( demux->stream, whichChunk * CHUNKSIZE );
}
demux->filepos = stream_tell( demux->stream );
tivo->whichChunk = demux->filepos / CHUNKSIZE;
readSize = stream_read( demux->stream, chunk, CHUNKSIZE );
if ( readSize != CHUNKSIZE )
return 0;
}
else
{
readSize = tmf_load_chunk( demux, tivo, chunk, tivo->whichChunk );
if ( readSize != CHUNKSIZE )
return 0;
tivo->whichChunk++;
}
if (AV_RB32(chunk) == TIVO_PES_FILEID)
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Skipping PART Header\n" );
} while (AV_RB32(chunk) == TIVO_PES_FILEID);
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"\nty:actual current offset %"PRIx64"\n", stream_tell( demux->stream ) -
CHUNKSIZE );
// Let's make a Video Demux Stream for MPlayer
aid = 0x0;
if( !demux->v_streams[ aid ] ) new_sh_video( demux, aid );
if( demux->video->id == -1 ) demux->video->id = aid;
if( demux->video->id == aid )
{
demux_stream_t *ds = demux->video;
if( !ds->sh ) ds->sh = demux->v_streams[ aid ];
}
// ======================================================================
// Finally, we get to actually parse the chunk
// ======================================================================
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty parsing a chunk\n" );
numberRecs = chunk[ 0 ];
recPtr = &chunk[ 4 ];
offset = numberRecs * 16 + 4;
for ( counter = 0 ; counter < numberRecs ; counter++ )
{
int size = AV_RB24(recPtr) >> 4;
int type = recPtr[ 3 ];
int nybbleType = recPtr[ 2 ] & 0x0f;
recordsDecoded++;
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:Record Type %x/%x %d\n", nybbleType, type, size );
// ================================================================
// Video Parsing
// ================================================================
if ( type == 0xe0 )
{
if ( size > 0 && size + offset <= CHUNKSIZE )
{
int esOffset1 = demux_ty_FindESHeader( VIDEO_NAL, &chunk[ offset ],
size);
if ( esOffset1 != -1 )
tivo->lastVideoPTS = get_ty_pts(
&chunk[ offset + esOffset1 + 9 ] );
// Do NOT Pass the PES Header onto the MPEG2 Decode
if( nybbleType != 0x06 )
demux_ty_CopyToDemuxPacket( demux->video,
&chunk[ offset ], size, demux->filepos + offset,
tivo->lastVideoPTS );
offset += size;
}
else
errorHeader++;
}
// ================================================================
// Audio Parsing
// ================================================================
else if ( type == 0xc0 )
{
if ( size > 0 && size + offset <= CHUNKSIZE )
{
if( demux->audio->id == -1 )
{
if ( nybbleType == 0x02 )
continue; // DTiVo inconclusive, wait for more
else if ( nybbleType == 0x09 )
{
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting AC-3 Audio\n" );
aid = 0x80; // AC-3
}
else
{
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Setting MPEG Audio\n" );
aid = 0x0; // MPEG Audio
}
demux->audio->id = aid;
if( !demux->a_streams[ aid ] ) new_sh_audio( demux, aid );
if( demux->audio->id == aid )
{
demux_stream_t *ds = demux->audio;
if( !ds->sh ) {
sh_audio_t* sh_a;
ds->sh = demux->a_streams[ aid ];
sh_a = (sh_audio_t*)ds->sh;
switch(aid & 0xE0){ // 1110 0000 b (high 3 bit: type low 5: id)
case 0x00: sh_a->format=0x50;break; // mpeg
case 0xA0: sh_a->format=0x10001;break; // dvd pcm
case 0x80: if((aid & 0xF8) == 0x88) sh_a->format=0x2001;//dts
else sh_a->format=0x2000;break; // ac3
}
}
}
}
aid = demux->audio->id;
// SA DTiVo Audio Data, no PES
// ================================================
if ( nybbleType == 0x02 || nybbleType == 0x04 )
{
if ( nybbleType == 0x02 && tivo->tivoType == 2 )
demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
else
{
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:Adding Audio Packet Size %d\n", size );
demux_ty_CopyToDemuxPacket( demux->audio,
&chunk[ offset ], size, ( demux->filepos + offset ),
tivo->lastAudioPTS );
}
}
// 3 - MPEG Audio with PES Header, either SA or DTiVo
// 9 - DTiVo AC3 Audio Data with PES Header
// ================================================
if ( nybbleType == 0x03 || nybbleType == 0x09 )
{
int esOffset1, esOffset2;
if ( nybbleType == 0x03 )
esOffset1 = demux_ty_FindESHeader( AUDIO_NAL, &chunk[ offset ],
size);
// SA PES Header, No Audio Data
// ================================================
if ( nybbleType == 0x03 && esOffset1 == 0 && size == 16 )
{
tivo->tivoType = 1;
tivo->lastAudioPTS = get_ty_pts( &chunk[ offset +
SERIES2_PTS_OFFSET ] );
}
else
// DTiVo Audio with PES Header
// ================================================
{
tivo->tivoType = 2;
demux_ty_AddToAudioBuffer( tivo, &chunk[ offset ], size );
demux_ty_FindESPacket( nybbleType == 9 ? AC3_NAL : AUDIO_NAL,
tivo->lastAudio, tivo->lastAudioEnd, &esOffset1,
&esOffset2 );
if ( esOffset1 != -1 && esOffset2 != -1 )
{
int packetSize = esOffset2 - esOffset1;
int headerSize;
int ptsOffset;
if ( IsValidAudioPacket( packetSize, &ptsOffset,
&headerSize ) )
{
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:Adding DTiVo Audio Packet Size %d\n",
packetSize );
tivo->lastAudioPTS = get_ty_pts(
&tivo->lastAudio[ esOffset1 + ptsOffset ] );
if (nybbleType == 9) headerSize = 0;
demux_ty_CopyToDemuxPacket
(
demux->audio,
&tivo->lastAudio[ esOffset1 + headerSize ],
packetSize - headerSize,
demux->filepos + offset,
tivo->lastAudioPTS
);
}
// Collapse the Audio Buffer
tivo->lastAudioEnd -= esOffset2;
memmove( &tivo->lastAudio[ 0 ],
&tivo->lastAudio[ esOffset2 ],
tivo->lastAudioEnd );
}
}
}
offset += size;
}
else
errorHeader++;
}
// ================================================================
// 1 = Closed Caption
// 2 = Extended Data Services
// ================================================================
else if ( type == 0x01 || type == 0x02 )
{
unsigned char lastXDS[ 16 ];
int b = AV_RB24(recPtr) >> 4;
b &= 0x7f7f;
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:%s %04x\n", type == 1 ? "CC" : "XDS", b);
lastXDS[ 0x00 ] = 0x00;
lastXDS[ 0x01 ] = 0x00;
lastXDS[ 0x02 ] = 0x01;
lastXDS[ 0x03 ] = 0xb2;
lastXDS[ 0x04 ] = 'T';
lastXDS[ 0x05 ] = 'Y';
lastXDS[ 0x06 ] = type;
lastXDS[ 0x07 ] = b >> 8;
lastXDS[ 0x08 ] = b;
if ( subcc_enabled )
demux_ty_CopyToDemuxPacket( demux->video, lastXDS, 0x09,
demux->filepos + offset, tivo->lastVideoPTS );
}
// ================================================================
// Unknown
// ================================================================
else
{
if ( size > 0 && size + offset <= CHUNKSIZE )
offset += size;
if (type != 3 && type != 5 && (type != 0 || size > 0)) {
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Invalid Type %x\n", type );
invalidType++;
}
}
recPtr += 16;
}
if ( errorHeader > 0 || invalidType > 0 )
{
mp_msg( MSGT_DEMUX, MSGL_DBG3,
"ty:Error Check - Records %d, Parsed %d, Errors %d + %d\n",
numberRecs, recordsDecoded, errorHeader, invalidType );
// Invalid MPEG ES Size Check
if ( errorHeader > numberRecs / 2 )
return 0;
// Invalid MPEG Stream Type Check
if ( invalidType > numberRecs / 2 )
return 0;
}
demux->filepos = stream_tell( demux->stream );
return 1;
}
static void demux_seek_ty( demuxer_t *demuxer, float rel_seek_secs, float audio_delay, int flags )
{
demux_stream_t *d_audio = demuxer->audio;
demux_stream_t *d_video = demuxer->video;
sh_audio_t *sh_audio = d_audio->sh;
sh_video_t *sh_video = d_video->sh;
off_t newpos;
off_t res;
TiVoInfo *tivo = demuxer->priv;
mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:Seeking to %7.1f\n", rel_seek_secs );
tivo->lastAudioEnd = 0;
tivo->lastAudioPTS = MP_NOPTS_VALUE;
tivo->lastVideoPTS = MP_NOPTS_VALUE;
//
//================= seek in MPEG ==========================
demuxer->filepos = stream_tell( demuxer->stream );
newpos = ( flags & SEEK_ABSOLUTE ) ? demuxer->movi_start : demuxer->filepos;
if( flags & SEEK_FACTOR )
// float seek 0..1
newpos += ( demuxer->movi_end - demuxer->movi_start ) * rel_seek_secs;
else
{
// time seek (secs)
if( ! sh_video->i_bps ) // unspecified or VBR
newpos += 2324 * 75 * rel_seek_secs; // 174.3 kbyte/sec
else
newpos += sh_video->i_bps * rel_seek_secs;
}
if ( newpos < demuxer->movi_start )
{
if( demuxer->stream->type != STREAMTYPE_VCD ) demuxer->movi_start = 0;
if( newpos < demuxer->movi_start ) newpos = demuxer->movi_start;
}
res = newpos / CHUNKSIZE;
if ( rel_seek_secs >= 0 )
newpos = ( res + 1 ) * CHUNKSIZE;
else
newpos = res * CHUNKSIZE;
if ( newpos < 0 )
newpos = 0;
tivo->whichChunk = newpos / CHUNKSIZE;
stream_seek( demuxer->stream, newpos );
// re-sync video:
videobuf_code_len = 0; // reset ES stream buffer
ds_fill_buffer( d_video );
if( sh_audio )
ds_fill_buffer( d_audio );
while( 1 )
{
int i;
if( sh_audio && !d_audio->eof && d_video->pts && d_audio->pts )
{
float a_pts = d_audio->pts;
a_pts += ( ds_tell_pts( d_audio ) - sh_audio->a_in_buffer_len ) /
(float)sh_audio->i_bps;
if( d_video->pts > a_pts )
{
skip_audio_frame( sh_audio ); // sync audio
continue;
}
}
i = sync_video_packet( d_video );
if( i == 0x1B3 || i == 0x1B8 ) break; // found it!
if( !i || !skip_video_packet( d_video ) ) break; // EOF?
}
if ( subcc_enabled )
ty_ClearOSD( 0 );
}
static int demux_ty_control( demuxer_t *demuxer,int cmd, void *arg )
{
demux_stream_t *d_video = demuxer->video;
sh_video_t *sh_video = d_video->sh;
switch(cmd)
{
case DEMUXER_CTRL_GET_TIME_LENGTH:
if(!sh_video->i_bps) // unspecified or VBR
return DEMUXER_CTRL_DONTKNOW;
*(double *)arg=
(double)demuxer->movi_end-demuxer->movi_start/sh_video->i_bps;
return DEMUXER_CTRL_GUESS;
case DEMUXER_CTRL_GET_PERCENT_POS:
return DEMUXER_CTRL_DONTKNOW;
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
static void demux_close_ty( demuxer_t *demux )
{
TiVoInfo *tivo = demux->priv;
free( tivo );
sub_justify = 0;
}
static int ty_check_file(demuxer_t* demuxer)
{
TiVoInfo *tivo = calloc(1, sizeof(TiVoInfo));
demuxer->priv = tivo;
return ds_fill_buffer(demuxer->video) ? DEMUXER_TYPE_MPEG_TY : 0;
}
static demuxer_t* demux_open_ty(demuxer_t* demuxer)
{
sh_audio_t *sh_audio=NULL;
sh_video_t *sh_video=NULL;
sh_video=demuxer->video->sh;sh_video->ds=demuxer->video;
if(demuxer->audio->id!=-2) {
if(!ds_fill_buffer(demuxer->audio)){
mp_msg(MSGT_DEMUXER,MSGL_INFO,"MPEG: " MSGTR_MissingAudioStream);
demuxer->audio->sh=NULL;
} else {
sh_audio=demuxer->audio->sh;sh_audio->ds=demuxer->audio;
}
}
return demuxer;
}
const demuxer_desc_t demuxer_desc_mpeg_ty = {
"TiVo demuxer",
"tivo",
"TiVo",
"Christopher R. Wingert",
"Demux streams from TiVo",
DEMUXER_TYPE_MPEG_TY,
0, // unsafe autodetect
ty_check_file,
demux_ty_fill_buffer,
demux_open_ty,
demux_close_ty,
demux_seek_ty,
demux_ty_control
};
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