diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/demo/Wave_Writer.cpp')
| -rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/demo/Wave_Writer.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/demo/Wave_Writer.cpp b/plugins/gme/Game_Music_Emu-0.5.2/demo/Wave_Writer.cpp new file mode 100644 index 00000000..ec40959d --- /dev/null +++ b/plugins/gme/Game_Music_Emu-0.5.2/demo/Wave_Writer.cpp @@ -0,0 +1,182 @@ +// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ + +#include "Wave_Writer.h" + +#include <assert.h> +#include <stdlib.h> + +/* Copyright (C) 2003-2006 by Shay Green. Permission is hereby granted, free +of charge, to any person obtaining a copy of this software and associated +documentation files (the "Software"), to deal in the Software without +restriction, including without limitation the rights to use, copy, modify, +merge, publish, distribute, sublicense, and/or sell copies of the Software, and +to permit persons to whom the Software is furnished to do so, subject to the +following conditions: The above copyright notice and this permission notice +shall be included in all copies or substantial portions of the Software. THE +SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, +INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A +PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR +COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER +IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ + +const int header_size = 0x2C; + +static void exit_with_error( const char* str ) +{ + printf( "Error: %s\n", str ); getchar(); + exit( EXIT_FAILURE ); +} + +Wave_Writer::Wave_Writer( long sample_rate, const char* filename ) +{ + sample_count_ = 0; + rate = sample_rate; + buf_pos = header_size; + chan_count = 1; + + buf = (unsigned char*) malloc( buf_size * sizeof *buf ); + if ( !buf ) + exit_with_error( "Out of memory" ); + + file = fopen( filename, "wb" ); + if ( !file ) + exit_with_error( "Couldn't open WAVE file for writing" ); + + setvbuf( file, 0, _IOFBF, 32 * 1024L ); +} + +void Wave_Writer::flush() +{ + if ( buf_pos && !fwrite( buf, buf_pos, 1, file ) ) + exit_with_error( "Couldn't write WAVE data" ); + buf_pos = 0; +} + +void Wave_Writer::write( const sample_t* in, long remain, int skip ) +{ + sample_count_ += remain; + while ( remain ) + { + if ( buf_pos >= buf_size ) + flush(); + + long n = (buf_size - buf_pos) / sizeof (sample_t); + if ( n > remain ) + n = remain; + remain -= n; + + // convert to lsb first format + unsigned char* p = &buf [buf_pos]; + while ( n-- ) + { + int s = *in; + in += skip; + *p++ = (unsigned char) s; + *p++ = (unsigned char) (s >> 8); + } + + buf_pos = p - buf; + assert( buf_pos <= buf_size ); + } +} + + +void Wave_Writer::write( const float* in, long remain, int skip ) +{ + sample_count_ += remain; + while ( remain ) + { + if ( buf_pos >= buf_size ) + flush(); + + long n = (buf_size - buf_pos) / sizeof (sample_t); + if ( n > remain ) + n = remain; + remain -= n; + + // convert to lsb first format + unsigned char* p = &buf [buf_pos]; + while ( n-- ) + { + long s = (long) (*in * 0x7FFF); + in += skip; + if ( (short) s != s ) + s = 0x7FFF - (s >> 24); // clamp to 16 bits + *p++ = (unsigned char) s; + *p++ = (unsigned char) (s >> 8); + } + + buf_pos = p - buf; + assert( buf_pos <= buf_size ); + } +} + +void Wave_Writer::close() +{ + if ( file ) + { + flush(); + + // generate header + long ds = sample_count_ * sizeof (sample_t); + long rs = header_size - 8 + ds; + int frame_size = chan_count * sizeof (sample_t); + long bps = rate * frame_size; + unsigned char header [header_size] = + { + 'R','I','F','F', + rs,rs>>8, // length of rest of file + rs>>16,rs>>24, + 'W','A','V','E', + 'f','m','t',' ', + 0x10,0,0,0, // size of fmt chunk + 1,0, // uncompressed format + chan_count,0, // channel count + rate,rate >> 8, // sample rate + rate>>16,rate>>24, + bps,bps>>8, // bytes per second + bps>>16,bps>>24, + frame_size,0, // bytes per sample frame + 16,0, // bits per sample + 'd','a','t','a', + ds,ds>>8,ds>>16,ds>>24// size of sample data + // ... // sample data + }; + + // write header + fseek( file, 0, SEEK_SET ); + fwrite( header, sizeof header, 1, file ); + + fclose( file ); + file = 0; + free( buf ); + } +} + +Wave_Writer::~Wave_Writer() +{ + close(); +} + +// C interface + +static Wave_Writer* ww; + +void wave_open( long sample_rate, const char* filename ) +{ + ww = new Wave_Writer( sample_rate, filename ); + assert( ww ); +} + +void wave_enable_stereo() { ww->enable_stereo(); } + +long wave_sample_count() { return ww->sample_count(); } + +void wave_write( const short* buf, long count ) { ww->write( buf, count ); } + +void wave_close() +{ + delete ww; + ww = 0; +} |