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https://github.com/ZDoom/gzdoom.git
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3bfcc5c09c
spc_amp from a x.4 fixed point number to a normal float. - Switched SPC playback from the external SNESAPU.DLL to Blargg's LGPL snes_spc library. I've compiled it with the fast DSP rather than the highly accurate one, since I didn't notice a meaningful difference between the two in my limited testing. In short: SPC playback is now built in to ZDoom. You don't need to download anything extra to make it work, and it also works on Linux as well as Windows (though building with Linux is currently untested). - Fixed: Stereo separation was calculated very wrongly when in 2D sound mode. SVN r794 (trunk)
153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/* snes_spc 0.9.0. http://www.slack.net/~ant/ */
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#include "wave_writer.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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/* Copyright (C) 2003-2007 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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enum { buf_size = 32768 * 2 };
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enum { header_size = 0x2C };
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typedef short sample_t;
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static unsigned char* buf;
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static FILE* file;
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static long sample_count_;
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static long sample_rate_;
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static long buf_pos;
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static int chan_count;
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static void exit_with_error( const char* str )
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{
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printf( "Error: %s\n", str ); getchar();
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exit( EXIT_FAILURE );
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}
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void wave_open( long sample_rate, const char* filename )
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{
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sample_count_ = 0;
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sample_rate_ = sample_rate;
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buf_pos = header_size;
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chan_count = 1;
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buf = (unsigned char*) malloc( buf_size * sizeof *buf );
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if ( !buf )
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exit_with_error( "Out of memory" );
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file = fopen( filename, "wb" );
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if ( !file )
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exit_with_error( "Couldn't open WAVE file for writing" );
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setvbuf( file, 0, _IOFBF, 32 * 1024L );
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}
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void wave_enable_stereo( void )
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{
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chan_count = 2;
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}
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static void flush_()
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{
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if ( buf_pos && !fwrite( buf, buf_pos, 1, file ) )
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exit_with_error( "Couldn't write WAVE data" );
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buf_pos = 0;
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}
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void wave_write( short const* in, long remain )
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{
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sample_count_ += remain;
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while ( remain )
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{
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if ( buf_pos >= buf_size )
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flush_();
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{
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unsigned char* p = &buf [buf_pos];
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long n = (buf_size - buf_pos) / sizeof (sample_t);
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if ( n > remain )
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n = remain;
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remain -= n;
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/* convert to LSB first format */
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while ( n-- )
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{
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int s = *in++;
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*p++ = (unsigned char) s;
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*p++ = (unsigned char) (s >> 8);
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}
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buf_pos = p - buf;
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assert( buf_pos <= buf_size );
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}
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}
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}
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long wave_sample_count( void )
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{
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return sample_count_;
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}
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static void set_le32( void* p, unsigned long n )
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{
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((unsigned char*) p) [0] = (unsigned char) n;
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((unsigned char*) p) [1] = (unsigned char) (n >> 8);
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((unsigned char*) p) [2] = (unsigned char) (n >> 16);
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((unsigned char*) p) [3] = (unsigned char) (n >> 24);
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}
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void wave_close( void )
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{
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if ( file )
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{
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/* generate header */
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unsigned char h [header_size] =
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{
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'R','I','F','F',
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0,0,0,0, /* length of rest of file */
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'W','A','V','E',
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'f','m','t',' ',
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0x10,0,0,0, /* size of fmt chunk */
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1,0, /* uncompressed format */
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0,0, /* channel count */
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0,0,0,0, /* sample rate */
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0,0,0,0, /* bytes per second */
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0,0, /* bytes per sample frame */
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16,0, /* bits per sample */
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'd','a','t','a',
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0,0,0,0, /* size of sample data */
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/* ... */ /* sample data */
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};
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long ds = sample_count_ * sizeof (sample_t);
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int frame_size = chan_count * sizeof (sample_t);
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set_le32( h + 0x04, header_size - 8 + ds );
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h [0x16] = chan_count;
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set_le32( h + 0x18, sample_rate_ );
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set_le32( h + 0x1C, sample_rate_ * frame_size );
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h [0x20] = frame_size;
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set_le32( h + 0x28, ds );
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flush_();
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/* write header */
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fseek( file, 0, SEEK_SET );
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fwrite( h, sizeof h, 1, file );
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fclose( file );
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file = 0;
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free( buf );
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buf = 0;
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}
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}
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