iOS录音转码（MP3）

由于采用手机端系统的录音功能，为了让iOS和Android的录音在其他平台上能够正常播放，这是就需要对录音的文件进行转码，一般转成MP3格式，这里转码用的三方库是lame

lame三方库的资源

ios端对于录音转码的源码如下：

//音频转码

- (void)audio_mp3

{

NSString *cafFilePath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];

cafFilePath = [cafFilePath stringByAppendingPathComponent:kRecordAudioFile];

NSString *mp3FilePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];

mp3FilePath = [mp3FilePath stringByAppendingPathComponent:@"myRecord1.mp3"];

@try{

intread, write;

FILE*pcm =fopen([cafFilePath cStringUsingEncoding:NSASCIIStringEncoding],"rb");

fseek(pcm,4*1024,SEEK_CUR);

FILE*mp3 =fopen([mp3FilePath cStringUsingEncoding:NSASCIIStringEncoding],"wb");

const int PCM_SIZE =8192;

const int MP3_SIZE =8192;

short int pcm_buffer[PCM_SIZE *2];

unsigned char mp3_buffer[MP3_SIZE];

lame_t lame =lame_init();

lame_set_in_samplerate(lame, 11025.0);

lame_set_VBR(lame, vbr_default);

lame_init_params(lame);

do{

read = (int)fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);

if(read ==0)

write =lame_encode_flush(lame, mp3_buffer, MP3_SIZE);

else

write =lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);

fwrite(mp3_buffer, write,1, mp3);

}while(read !=0);

lame_close(lame);

fclose(mp3);

fclose(pcm);

}

@catch(NSException *exception) {

NSLog(@"%@",[exception description]);

}

@finally{

NSLog(@"MP3生成成功: %@",mp3FilePath);

}

}

音频转码的代码就这些，希望能对大家有一点的帮助。