demux_ty.c

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/*
 * [e-mail], 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 <mplaylib.h>
#include <mplaylib.h>
#include <mplaylib.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"
#undef memcpy
#define memcpy uc_memcpy
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 ];
   unsigned char    *chunk;
   int              readSize;

   int              numberRecs;
   unsigned char    *recPtr;
   int              offset;

   int              counter;

   int              aid;
   chunk = (unsigned char *)malloc(CHUNKSIZE);
   if(!chunk) return 0;
   TiVoInfo         *tivo = demux->priv;

   if ( demux->stream->type == STREAMTYPE_DVD )
   {	
      goto errexit;
	 }
   mp_msg( MSGT_DEMUX, MSGL_DBG3, "ty:ty processing\n" );

   if( demux->stream->eof ) 
   		goto errexit;

   // ======================================================================
   // 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