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Only allow MPEG-1, Layer III as first frame

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This prevents passing the frames to packMP3 for each frame which slows
down the process for non-MPEG-1, Layer III MP3s
This commit is contained in:
Christian Schneider 2016-01-22 07:43:26 +01:00
parent 0bc525232a
commit ff680417db
1 changed files with 5 additions and 1 deletions
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6
precomp.cpp
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@ -125,6 +125,7 @@ const char* pjglib_version_info( void );
//PackMP3 things
#include "contrib/packjpg/bitops.h" // for MBITS
#include "contrib/packmp3/pmp3tbl.h"
// function to convert MP3 to PMP and vice versa
@ -4052,7 +4053,10 @@ bool compress_file(float min_percent, float max_percent) {
protection = (in[1] >> 0) & 0x1;
samples = (in[2] >> 2) & 0x3;
channels = (in[3] >> 6) & 0x3;
} else if (
// type must be MPEG-1, Layer III, packMP3 won't process any other files
int type = MBITS( in[1], 5, 1 );
if ( type != MPEG1_LAYER_III ) break;
} else if (
(mpeg != ((in[1] >> 3) & 0x3)) ||
(layer != ((in[1] >> 1) & 0x3)) ||
(protection != ((in[1] >> 0) & 0x1)) ||