81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
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#include "main.h"
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#include <stddef.h>
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struct ExtendedRead
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{
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SF_INFO info;
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SNDFILE *soundFile;
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int bits;
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int frameSize;
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};
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extern "C"
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{
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//returns handle!=0 if successful, 0 if error
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//size will return the final nb of bytes written to the output, -1 if unknown
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__declspec( dllexport ) intptr_t winampGetExtendedRead_openW( const wchar_t *fn, int *size, int *bps, int *nch, int *srate )
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{
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ExtendedRead *extRead = (ExtendedRead *)calloc( 1, sizeof( ExtendedRead ) );
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extRead->info.format = 0;
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extRead->soundFile = sf_wchar_open( fn, SFM_READ, &extRead->info );
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if ( !extRead->soundFile )
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{
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free( extRead );
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return 0;
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}
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switch ( extRead->info.format & SF_FORMAT_SUBMASK )
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{
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case SF_FORMAT_FLOAT:
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case SF_FORMAT_DOUBLE:
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sf_command( extRead->soundFile, SFC_SET_SCALE_FLOAT_INT_READ, NULL, SF_TRUE );
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break;
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}
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extRead->bits = 16; // TODO: calculate bits per sample (what we want to use, not necessarily what the file has)
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*bps = extRead->bits;
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*nch = extRead->info.channels;
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*srate = extRead->info.samplerate;
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extRead->frameSize = ( extRead->bits / 8 ) * extRead->info.channels;
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*size = (int)extRead->info.frames * extRead->frameSize; // TODO: is this correct?
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return (intptr_t)extRead;
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}
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//returns nb of bytes read. -1 if read error (like CD ejected). if (ret<len), EOF is assumed
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__declspec( dllexport ) intptr_t winampGetExtendedRead_getData( intptr_t handle, char *dest, int len, int *killswitch )
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{
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ExtendedRead *extRead = (ExtendedRead *)handle;
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sf_count_t framesRead = sf_readf_short( extRead->soundFile, (short *)dest, len / extRead->frameSize );
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return (int)framesRead * extRead->frameSize;
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}
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// return nonzero on success, zero on failure.
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__declspec( dllexport ) int winampGetExtendedRead_setTime( intptr_t handle, int time_in_ms )
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{
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ExtendedRead *extRead = (ExtendedRead *)handle;
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if ( !extRead->info.seekable )
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return 0;
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int frames = MulDiv( time_in_ms, extRead->info.samplerate, 1000 ); // TODO: verify calculation
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sf_seek( extRead->soundFile, frames, SEEK_SET );
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return 1;
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}
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__declspec( dllexport ) void winampGetExtendedRead_close( intptr_t handle )
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{
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ExtendedRead *extRead = (ExtendedRead *)handle;
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sf_close( extRead->soundFile );
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free( extRead );
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}
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}
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