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This commit is contained in:
Glenn Maynard
2006-12-09 20:01:41 +00:00
parent aebfd2af2e
commit 18d44445e3
1 changed files with 44 additions and 46 deletions
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stepmania/src/RageSoundReader_MP3.cpp
+44 -46
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@@ -835,57 +835,55 @@ int RageSoundReader_MP3::SetPosition_toc( int iFrame, bool Xing )
* if we're using Xing. */ * if we're using Xing. */
mad->timer_accurate = !Xing; mad->timer_accurate = !Xing;
int bytepos = -1;
if( Xing )
{ {
int bytepos = -1; /* We can speed up the seek using the XING tag. First, figure
if( Xing ) * out what percentage the requested position falls in. */
int ms = int( (iFrame * 1000LL) / SampleRate );
int percent = ms * 100 / mad->length;
if( percent < 100 )
{ {
/* We can speed up the seek using the XING tag. First, figure int jump = mad->xingtag.toc[percent];
* out what percentage the requested position falls in. */ bytepos = mad->filesize * jump / 256;
int ms = int( (iFrame * 1000LL) / SampleRate );
int percent = ms * 100 / mad->length;
if( percent < 100 )
{
int jump = mad->xingtag.toc[percent];
bytepos = mad->filesize * jump / 256;
}
else
bytepos = 2000000000; /* force EOF */
mad_timer_set( &mad->Timer, 0, percent * mad->length, 100000 );
} }
else else
bytepos = 2000000000; /* force EOF */
mad_timer_set( &mad->Timer, 0, percent * mad->length, 100000 );
}
else
{
mad_timer_t desired;
mad_timer_set( &desired, 0, iFrame, SampleRate );
if( mad->tocmap.empty() )
return iFrame; /* don't have any info */
/* Find the last entry <= iFrame that we actually have an entry for;
* this will get us as close as possible. */
madlib_t::tocmap_t::iterator it = mad->tocmap.upper_bound( desired );
if( it == mad->tocmap.begin() )
return iFrame; /* don't have any info */
--it;
mad->Timer = it->first;
bytepos = it->second;
}
if( bytepos != -1 )
{
/* Seek backwards up to 4k. */
const int seekpos = max( 0, bytepos - 1024*4 );
seek_stream_to_byte( seekpos );
do
{ {
mad_timer_t desired; int ret = do_mad_frame_decode();
mad_timer_set( &desired, 0, iFrame, SampleRate ); if( ret <= 0 )
return ret; /* it set the error */
if( mad->tocmap.empty() ) } while( get_this_frame_byte(mad) < bytepos );
return iFrame; /* don't have any info */ synth_output();
/* Find the last entry <= iFrame that we actually have an entry for;
* this will get us as close as possible. */
madlib_t::tocmap_t::iterator it = mad->tocmap.upper_bound( desired );
if( it == mad->tocmap.begin() )
return iFrame; /* don't have any info */
--it;
mad->Timer = it->first;
bytepos = it->second;
}
if( bytepos != -1 )
{
/* Seek backwards up to 4k. */
const int seekpos = max( 0, bytepos - 1024*4 );
seek_stream_to_byte( seekpos );
do
{
int ret = do_mad_frame_decode();
if( ret <= 0 )
return ret; /* it set the error */
} while( get_this_frame_byte(mad) < bytepos );
synth_output();
}
} }
return iFrame; return iFrame;