/* ------------------------------------------------------------------
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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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