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GetLength optimization

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This commit is contained in:
Glenn Maynard
2003-10-03 23:23:28 +00:00
parent 802d8c7aff
commit 9ade4fa722
2 changed files with 11 additions and 5 deletions
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stepmania/src/RageSoundReader_MP3.cpp
+10 -4
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@@ -348,13 +348,20 @@ void fill_frame_index_cache( madlib_t *mad )
}
/* Handle first-stage decoding: extracting the MP3 frame data. */
int RageSoundReader_MP3::do_mad_frame_decode()
int RageSoundReader_MP3::do_mad_frame_decode( bool headers_only )
{
int bytes_read = 0;
while(1)
{
if( !mad_frame_decode(&mad->Frame,&mad->Stream) )
int ret;
/* Always actually decode the first packet, so we cleanly pass Xing tags. */
if( headers_only && !mad->first_frame )
ret=mad_header_decode( &mad->Frame.header,&mad->Stream );
else
ret=mad_frame_decode( &mad->Frame,&mad->Stream );
if( !ret )
{
/* OK. */
if( mad->first_frame )
@@ -1069,10 +1076,9 @@ int RageSoundReader_MP3::GetLengthInternal( bool fast )
}
MADLIB_rewind();
/* XXX use mad_header_decode (do_mad_frame_decode(true)?) */
while(1)
{
int ret = do_mad_frame_decode();
int ret = do_mad_frame_decode( true );
if( ret == -1 )
return -1; /* it set the error */
if( ret == 0 ) /* EOF */