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/*
* Copyright (C) 2009 The Android Open Source Project
*
* 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.
*/
#ifndef ANDROID_WAVEWRITER_H_
#define ANDROID_WAVEWRITER_H_
namespace android {
class WaveWriter {
public:
WaveWriter(const char *filename,
uint16_t num_channels, uint32_t sampling_rate)
: mFile(fopen(filename, "wb")),
mTotalBytes(0) {
fwrite("RIFFxxxxWAVEfmt \x10\x00\x00\x00\x01\x00", 1, 22, mFile);
write_u16(num_channels);
write_u32(sampling_rate);
write_u32(sampling_rate * num_channels * 2);
write_u16(num_channels * 2);
write_u16(16);
fwrite("dataxxxx", 1, 8, mFile);
}
~WaveWriter() {
fseek(mFile, 40, SEEK_SET);
write_u32(mTotalBytes);
fseek(mFile, 4, SEEK_SET);
write_u32(36 + mTotalBytes);
fclose(mFile);
mFile = NULL;
}
void Append(const void *data, size_t size) {
fwrite(data, 1, size, mFile);
mTotalBytes += size;
}
private:
void write_u16(uint16_t x) {
fputc(x & 0xff, mFile);
fputc(x >> 8, mFile);
}
void write_u32(uint32_t x) {
write_u16(x & 0xffff);
write_u16(x >> 16);
}
FILE *mFile;
size_t mTotalBytes;
};
} // namespace android
#endif // ANDROID_WAVEWRITER_H_
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