pcsx2/plugins/zerospu2/WavFile.cpp

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/* SPU2-X, A plugin for Emulating the Sound Processing Unit of the Playstation 2
* Developed and maintained by the Pcsx2 Development Team.
*
* The file is based on WavFile.h from SoundTouch library.
* Original portions are (c) 2009 by Olli Parviainen (oparviai 'at' iki.fi)
*
* SPU2-X is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* SPU2-X is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with SPU2-X. If not, see <http://www.gnu.org/licenses/>.
*/
// Note the file is mostly a copy paste of the WavFile.h from SoundTouch library. It was
// shrunken to support only output 16 bits wav files
#include <stdio.h>
#include <stdexcept>
#include <string>
#include <cstring>
#include <assert.h>
#include <limits.h>
#include "WavFile.h"
using namespace std;
static const char riffStr[] = "RIFF";
static const char waveStr[] = "WAVE";
static const char fmtStr[] = "fmt ";
static const char dataStr[] = "data";
//////////////////////////////////////////////////////////////////////////////
//
// Class WavOutFile
//
WavOutFile::WavOutFile(const char *fileName, int sampleRate, int bits, int channels)
{
bytesWritten = 0;
fptr = fopen(fileName, "wb");
if (fptr == NULL)
{
string msg = "Error : Unable to open file \"";
msg += fileName;
msg += "\" for writing.";
//pmsg = msg.c_str;
throw runtime_error(msg);
}
fillInHeader(sampleRate, bits, channels);
writeHeader();
}
WavOutFile::~WavOutFile()
{
finishHeader();
if (fptr) fclose(fptr);
fptr = NULL;
}
void WavOutFile::fillInHeader(uint sampleRate, uint bits, uint channels)
{
// fill in the 'riff' part..
// copy string 'RIFF' to riff_char
memcpy(&(header.riff.riff_char), riffStr, 4);
// package_len unknown so far
header.riff.package_len = 0;
// copy string 'WAVE' to wave
memcpy(&(header.riff.wave), waveStr, 4);
// fill in the 'format' part..
// copy string 'fmt ' to fmt
memcpy(&(header.format.fmt), fmtStr, 4);
header.format.format_len = 0x10;
header.format.fixed = 1;
header.format.channel_number = (short)channels;
header.format.sample_rate = (int)sampleRate;
header.format.bits_per_sample = (short)bits;
header.format.byte_per_sample = (short)(bits * channels / 8);
header.format.byte_rate = header.format.byte_per_sample * (int)sampleRate;
header.format.sample_rate = (int)sampleRate;
// fill in the 'data' part..
// copy string 'data' to data_field
memcpy(&(header.data.data_field), dataStr, 4);
// data_len unknown so far
header.data.data_len = 0;
}
void WavOutFile::finishHeader()
{
// supplement the file length into the header structure
header.riff.package_len = bytesWritten + 36;
header.data.data_len = bytesWritten;
writeHeader();
}
void WavOutFile::writeHeader()
{
int res;
// write the supplemented header in the beginning of the file
fseek(fptr, 0, SEEK_SET);
res = fwrite(&header, sizeof(header), 1, fptr);
if (res != 1)
{
throw runtime_error("Error while writing to a wav file.");
}
// jump back to the end of the file
fseek(fptr, 0, SEEK_END);
}
void WavOutFile::write(const short *buffer, int numElems)
{
int res;
// 16bit format & 16 bit samples
assert(header.format.bits_per_sample == 16);
if (numElems < 1) return; // nothing to do
res = fwrite(buffer, 2, numElems, fptr);
if (res != numElems)
{
throw runtime_error("Error while writing to a wav file.");
}
bytesWritten += 2 * numElems;
}