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97 lines
2.8 KiB
97 lines
2.8 KiB
/* ------------------------------------------------------------------ |
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* Copyright (C) 2009 Martin Storsjo |
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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 |
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* express or implied. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* ------------------------------------------------------------------- |
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*/ |
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#import <UIKit/UIkit.h> |
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#include "wav.h" |
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void WavWriter::writeString(const char *str) { |
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fputc(str[0], wav); |
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fputc(str[1], wav); |
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fputc(str[2], wav); |
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fputc(str[3], wav); |
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} |
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void WavWriter::writeInt32(int value) { |
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fputc((value >> 0) & 0xff, wav); |
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fputc((value >> 8) & 0xff, wav); |
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fputc((value >> 16) & 0xff, wav); |
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fputc((value >> 24) & 0xff, wav); |
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} |
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void WavWriter::writeInt16(int value) { |
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fputc((value >> 0) & 0xff, wav); |
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fputc((value >> 8) & 0xff, wav); |
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} |
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void WavWriter::writeHeader(int length) { |
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writeString("RIFF"); |
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writeInt32(4 + 8 + 20 + 8 + length); //将16改为20 |
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writeString("WAVE"); |
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writeString("fmt "); |
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writeInt32(20); |
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int bytesPerFrame = bitsPerSample/8*channels; |
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int bytesPerSec = bytesPerFrame*sampleRate; |
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writeInt16(1); // Format |
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writeInt16(channels); // Channels |
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writeInt32(sampleRate); // Samplerate |
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writeInt32(bytesPerSec); // Bytes per sec |
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writeInt16(bytesPerFrame); // Bytes per frame |
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writeInt16(bitsPerSample); // Bits per sample |
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writeInt32(0); //这儿需要字节对齐 nExSize |
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writeString("data"); |
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writeInt32(length); |
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} |
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WavWriter::WavWriter(const char *filename, int sampleRate, int bitsPerSample, int channels) |
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{ |
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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); |
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NSString *documentPath = [paths objectAtIndex:0]; |
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NSString *docFilePath = [documentPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%s", filename]]; |
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// NSLog(@"documentPath=%@", documentPath); |
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wav = fopen([docFilePath cStringUsingEncoding:NSASCIIStringEncoding], "wb"); |
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if (wav == NULL) |
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return; |
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dataLength = 0; |
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this->sampleRate = sampleRate; |
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this->bitsPerSample = bitsPerSample; |
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this->channels = channels; |
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writeHeader(dataLength); |
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} |
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WavWriter::~WavWriter() { |
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if (wav == NULL) |
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return; |
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fseek(wav, 0, SEEK_SET); |
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writeHeader(dataLength); |
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fclose(wav); |
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} |
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void WavWriter::writeData(const unsigned char* data, int length) { |
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if (wav == NULL) |
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return; |
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fwrite(data, length, 1, wav); |
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dataLength += length; |
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} |
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