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72 lines
1.8 KiB
72 lines
1.8 KiB
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_WAVEWRITER_H_
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#define ANDROID_WAVEWRITER_H_
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namespace android {
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class WaveWriter {
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public:
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WaveWriter(const char *filename,
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uint16_t num_channels, uint32_t sampling_rate)
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: mFile(fopen(filename, "wb")),
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mTotalBytes(0) {
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fwrite("RIFFxxxxWAVEfmt \x10\x00\x00\x00\x01\x00", 1, 22, mFile);
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write_u16(num_channels);
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write_u32(sampling_rate);
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write_u32(sampling_rate * num_channels * 2);
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write_u16(num_channels * 2);
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write_u16(16);
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fwrite("dataxxxx", 1, 8, mFile);
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}
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~WaveWriter() {
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fseek(mFile, 40, SEEK_SET);
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write_u32(mTotalBytes);
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fseek(mFile, 4, SEEK_SET);
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write_u32(36 + mTotalBytes);
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fclose(mFile);
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mFile = NULL;
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}
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void Append(const void *data, size_t size) {
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fwrite(data, 1, size, mFile);
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mTotalBytes += size;
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}
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private:
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void write_u16(uint16_t x) {
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fputc(x & 0xff, mFile);
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fputc(x >> 8, mFile);
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}
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void write_u32(uint32_t x) {
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write_u16(x & 0xffff);
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write_u16(x >> 16);
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}
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FILE *mFile;
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size_t mTotalBytes;
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};
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} // namespace android
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#endif // ANDROID_WAVEWRITER_H_
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