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/* ------------------------------------------------------------------
* Copyright (C) 2009 Martin Storsjo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "wav.h"
void WavWriter::writeString(const char *str) {
fputc(str[0], wav);
fputc(str[1], wav);
fputc(str[2], wav);
fputc(str[3], wav);
}
void WavWriter::writeInt32(int value) {
fputc((value >> 0) & 0xff, wav);
fputc((value >> 8) & 0xff, wav);
fputc((value >> 16) & 0xff, wav);
fputc((value >> 24) & 0xff, wav);
}
void WavWriter::writeInt16(int value) {
fputc((value >> 0) & 0xff, wav);
fputc((value >> 8) & 0xff, wav);
}
void WavWriter::writeHeader(int length) {
writeString("RIFF");
writeInt32(4 + 8 + 16 + 8 + length);
writeString("WAVE");
writeString("fmt ");
writeInt32(16);
int bytesPerFrame = bitsPerSample/8*channels;
int bytesPerSec = bytesPerFrame*sampleRate;
writeInt16(1); // Format
writeInt16(channels); // Channels
writeInt32(sampleRate); // Samplerate
writeInt32(bytesPerSec); // Bytes per sec
writeInt16(bytesPerFrame); // Bytes per frame
writeInt16(bitsPerSample); // Bits per sample
writeString("data");
writeInt32(length);
}
WavWriter::WavWriter(const char *filename, int sampleRate, int bitsPerSample, int channels) {
wav = fopen(filename, "wb");
if (wav == NULL)
return;
dataLength = 0;
this->sampleRate = sampleRate;
this->bitsPerSample = bitsPerSample;
this->channels = channels;
writeHeader(dataLength);
}
WavWriter::~WavWriter() {
if (wav == NULL)
return;
fseek(wav, 0, SEEK_SET);
writeHeader(dataLength);
fclose(wav);
}
void WavWriter::writeData(const unsigned char* data, int length) {
if (wav == NULL)
return;
fwrite(data, length, 1, wav);
dataLength += length;
}
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