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/*
* PortAudio Portable Real-Time Audio Library
* Latest Version at: http://www.portaudio.com
*
* Copyright (c) 1999-2010 Phil Burk and Ross Bencina
*
* 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.
*/
/*
* The text above constitutes the entire PortAudio license; however,
* the PortAudio community also makes the following non-binding requests:
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version. It is also
* requested that these non-binding requests be included along with the
* license above.
*/
/**
* Very simple WAV file writer for saving captured audio.
*/
#include <stdio.h>
#include <stdlib.h>
#include "write_wav.h"
/* Write long word data to a little endian format byte array. */
static void WriteLongLE( unsigned char **addrPtr, unsigned long data )
{
unsigned char *addr = *addrPtr;
*addr++ = (unsigned char) data;
*addr++ = (unsigned char) (data>>8);
*addr++ = (unsigned char) (data>>16);
*addr++ = (unsigned char) (data>>24);
*addrPtr = addr;
}
/* Write short word data to a little endian format byte array. */
static void WriteShortLE( unsigned char **addrPtr, unsigned short data )
{
unsigned char *addr = *addrPtr;
*addr++ = (unsigned char) data;
*addr++ = (unsigned char) (data>>8);
*addrPtr = addr;
}
/* Write IFF ChunkType data to a byte array. */
static void WriteChunkType( unsigned char **addrPtr, unsigned long cktyp )
{
unsigned char *addr = *addrPtr;
*addr++ = (unsigned char) (cktyp>>24);
*addr++ = (unsigned char) (cktyp>>16);
*addr++ = (unsigned char) (cktyp>>8);
*addr++ = (unsigned char) cktyp;
*addrPtr = addr;
}
#define WAV_HEADER_SIZE (4 + 4 + 4 + /* RIFF+size+WAVE */ \
4 + 4 + 16 + /* fmt chunk */ \
4 + 4 ) /* data chunk */
/*********************************************************************************
* Open named file and write WAV header to the file.
* The header includes the DATA chunk type and size.
* Returns number of bytes written to file or negative error code.
*/
long Audio_WAV_OpenWriter( WAV_Writer *writer, const char *fileName, int frameRate, int samplesPerFrame )
{
unsigned int bytesPerSecond;
unsigned char header[ WAV_HEADER_SIZE ];
unsigned char *addr = header;
int numWritten;
writer->dataSize = 0;
writer->dataSizeOffset = 0;
writer->fid = fopen( fileName, "wb" );
if( writer->fid == NULL )
{
return -1;
}
/* Write RIFF header. */
WriteChunkType( &addr, RIFF_ID );
/* Write RIFF size as zero for now. Will patch later. */
WriteLongLE( &addr, 0 );
/* Write WAVE form ID. */
WriteChunkType( &addr, WAVE_ID );
/* Write format chunk based on AudioSample structure. */
WriteChunkType( &addr, FMT_ID );
WriteLongLE( &addr, 16 );
WriteShortLE( &addr, WAVE_FORMAT_PCM );
bytesPerSecond = frameRate * samplesPerFrame * sizeof( short);
WriteShortLE( &addr, (short) samplesPerFrame );
WriteLongLE( &addr, frameRate );
WriteLongLE( &addr, bytesPerSecond );
WriteShortLE( &addr, (short) (samplesPerFrame * sizeof( short)) ); /* bytesPerBlock */
WriteShortLE( &addr, (short) 16 ); /* bits per sample */
/* Write ID and size for 'data' chunk. */
WriteChunkType( &addr, DATA_ID );
/* Save offset so we can patch it later. */
writer->dataSizeOffset = (int) (addr - header);
WriteLongLE( &addr, 0 );
numWritten = fwrite( header, 1, sizeof(header), writer->fid );
if( numWritten != sizeof(header) ) return -1;
return (int) numWritten;
}
/*********************************************************************************
* Write to the data chunk portion of a WAV file.
* Returns bytes written or negative error code.
*/
long Audio_WAV_WriteShorts( WAV_Writer *writer,
short *samples,
int numSamples
)
{
unsigned char buffer[2];
unsigned char *bufferPtr;
int i;
short *p = samples;
int numWritten;
int bytesWritten;
if( numSamples <= 0 )
{
return -1;
}
for( i=0; i<numSamples; i++ )
{
bufferPtr = buffer;
WriteShortLE( &bufferPtr, *p++ );
numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
if( numWritten != sizeof(buffer) ) return -1;
}
bytesWritten = numSamples * sizeof(short);
writer->dataSize += bytesWritten;
return (int) bytesWritten;
}
/*********************************************************************************
* Close WAV file.
* Update chunk sizes so it can be read by audio applications.
*/
long Audio_WAV_CloseWriter( WAV_Writer *writer )
{
unsigned char buffer[4];
unsigned char *bufferPtr;
int numWritten;
int riffSize;
/* Go back to beginning of file and update DATA size */
int result = fseek( writer->fid, writer->dataSizeOffset, SEEK_SET );
if( result < 0 ) return result;
bufferPtr = buffer;
WriteLongLE( &bufferPtr, writer->dataSize );
numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
if( numWritten != sizeof(buffer) ) return -1;
/* Update RIFF size */
result = fseek( writer->fid, 4, SEEK_SET );
if( result < 0 ) return result;
riffSize = writer->dataSize + (WAV_HEADER_SIZE - 8);
bufferPtr = buffer;
WriteLongLE( &bufferPtr, riffSize );
numWritten = fwrite( buffer, 1, sizeof( buffer), writer->fid );
if( numWritten != sizeof(buffer) ) return -1;
fclose( writer->fid );
writer->fid = NULL;
return writer->dataSize;
}
/*********************************************************************************
* Simple test that write a sawtooth waveform to a file.
*/
#if 0
int main( void )
{
int i;
WAV_Writer writer;
int result;
#define NUM_SAMPLES (200)
short data[NUM_SAMPLES];
short saw = 0;
for( i=0; i<NUM_SAMPLES; i++ )
{
data[i] = saw;
saw += 293;
}
result = Audio_WAV_OpenWriter( &writer, "rendered_midi.wav", 44100, 1 );
if( result < 0 ) goto error;
for( i=0; i<15; i++ )
{
result = Audio_WAV_WriteShorts( &writer, data, NUM_SAMPLES );
if( result < 0 ) goto error;
}
result = Audio_WAV_CloseWriter( &writer );
if( result < 0 ) goto error;
return 0;
error:
printf("ERROR: result = %d\n", result );
return result;
}
#endif
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