1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_WAVEWRITER_H_ 18 19 #define ANDROID_WAVEWRITER_H_ 20 21 namespace android { 22 23 class WaveWriter { 24 public: 25 WaveWriter(const char *filename, 26 uint16_t num_channels, uint32_t sampling_rate) 27 : mFile(fopen(filename, "wb")), 28 mTotalBytes(0) { 29 fwrite("RIFFxxxxWAVEfmt \x10\x00\x00\x00\x01\x00", 1, 22, mFile); 30 write_u16(num_channels); 31 write_u32(sampling_rate); 32 write_u32(sampling_rate * num_channels * 2); 33 write_u16(num_channels * 2); 34 write_u16(16); 35 fwrite("dataxxxx", 1, 8, mFile); 36 } 37 38 ~WaveWriter() { 39 fseek(mFile, 40, SEEK_SET); 40 write_u32(mTotalBytes); 41 42 fseek(mFile, 4, SEEK_SET); 43 write_u32(36 + mTotalBytes); 44 45 fclose(mFile); 46 mFile = NULL; 47 } 48 49 void Append(const void *data, size_t size) { 50 fwrite(data, 1, size, mFile); 51 mTotalBytes += size; 52 } 53 54 private: 55 void write_u16(uint16_t x) { 56 fputc(x & 0xff, mFile); 57 fputc(x >> 8, mFile); 58 } 59 60 void write_u32(uint32_t x) { 61 write_u16(x & 0xffff); 62 write_u16(x >> 16); 63 } 64 65 FILE *mFile; 66 size_t mTotalBytes; 67 }; 68 69 } // namespace android 70 71 #endif // ANDROID_WAVEWRITER_H_ 72
