diff options
-rw-r--r-- | libmpdemux/demux_ty.c | 26 |
1 files changed, 11 insertions, 15 deletions
diff --git a/libmpdemux/demux_ty.c b/libmpdemux/demux_ty.c index 547dcd9d5a..4d8084cd9f 100644 --- a/libmpdemux/demux_ty.c +++ b/libmpdemux/demux_ty.c @@ -45,6 +45,7 @@ #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; @@ -354,21 +355,16 @@ static int IsValidAudioPacket( int size, int *ptsOffset, int *ptsLen ) static float get_ty_pts( unsigned char *buf ) { - float result = 0; - unsigned char temp; - - temp = ( buf[ 0 ] & 0xE ) >> 1; - result = ( (float) temp ) * ( (float) ( 1L << 30 ) ) / ( (float)PTS_KHZ ); - temp = buf[ 1 ]; - result += ( (float) temp ) * ( (float) ( 1L << 22 ) ) / ( (float)PTS_KHZ ); - temp = ( buf[ 2 ] & 0xFE ) >> 1; - result += ( (float) temp ) * ( (float) ( 1L << 15 ) ) / ( (float)PTS_KHZ ); - temp = buf[ 3 ]; - result += ( (float) temp ) * ( (float) ( 1L << 7 ) ) / ( (float)PTS_KHZ ); - temp = ( buf[ 4 ] & 0xFE ) >> 1; - result += ( (float) temp ) / ( (float)PTS_MHZ ); - - return result; + int a = buf[0] & 0xe; + int b = AV_RB16(buf + 1); + int c = AV_RB16(buf + 3); + uint64_t pts; + + if (!(1 & a & b & c)) // invalid MPEG timestamp + return 0; + a >>= 1; b >>= 1; c >>= 1; + pts = (((uint64_t)a) << 30) | (b << 15) | c; + return (float)pts / PTS_KHZ; } static void demux_ty_AddToAudioBuffer( TiVoInfo *tivo, unsigned char *buffer, |