iOS实现录音转码MP3及转码BASE64上传示例
iOS录音转码MP3及转码BASE64上传
一，开始录音
NSLog(@"开始录音");
[selfstartRecord];
-(void)startRecord
{
//删除上次生成的文件，保留最新文件
NSFileManager*fileManager=[NSFileManagerdefaultManager];
if([NSTemporaryDirectory()stringByAppendingString:@"myselfRecord.mp3"]){
[fileManagerremoveItemAtPath:[NSTemporaryDirectory()stringByAppendingString:@"myselfRecord.mp3"]error:nil];
}
if([NSTemporaryDirectory()stringByAppendingString:@"selfRecord.wav"]){
[fileManagerremoveItemAtPath:[NSTemporaryDirectory()stringByAppendingString:@"selfRecord.wav"]error:nil];
}
//开始录音
//录音设置
NSMutableDictionary*recordSetting=[[NSMutableDictionaryalloc]init];
//设置录音格式AVFormatIDKey==kAudioFormatLinearPCM
[recordSettingsetValue:[NSNumbernumberWithInt:kAudioFormatLinearPCM]forKey:AVFormatIDKey];
//设置录音采样率(Hz)如：AVSampleRateKey==8000/44100/96000（影响音频的质量）,采样率必须要设为11025才能使转化成mp3格式后不会失真
[recordSettingsetValue:[NSNumbernumberWithFloat:11025.0]forKey:AVSampleRateKey];
//录音通道数1或2，要转换成mp3格式必须为双通道
[recordSettingsetValue:[NSNumbernumberWithInt:2]forKey:AVNumberOfChannelsKey];
//线性采样位数8、16、24、32
[recordSettingsetValue:[NSNumbernumberWithInt:16]forKey:AVLinearPCMBitDepthKey];
//录音的质量
[recordSettingsetValue:[NSNumbernumberWithInt:AVAudioQualityHigh]forKey:AVEncoderAudioQualityKey];
//存储录音文件
recordUrl=[NSURLURLWithString:[NSTemporaryDirectory()stringByAppendingString:@"selfRecord.wav"]];
//初始化
audioRecorder=[[AVAudioRecorderalloc]initWithURL:recordUrlsettings:recordSettingerror:nil];
//开启音量检测
audioRecorder.meteringEnabled=YES;
audioSession=[AVAudioSessionsharedInstance];//得到AVAudioSession单例对象
if(![audioRecorderisRecording]){
[audioSessionsetCategory:AVAudioSessionCategoryPlayAndRecorderror:nil];//设置类别,表示该应用同时支持播放和录音
[audioSessionsetActive:YESerror:nil];//启动音频会话管理,此时会阻断后台音乐的播放.
[audioRecorderprepareToRecord];
[audioRecorderpeakPowerForChannel:0.0];
[audioRecorderrecord];
}
}
二，停止录音
[selfendRecord];
-(void)endRecord
{
[audioRecorderstop];//录音停止
[audioSessionsetActive:NOerror:nil];//一定要在录音停止以后再关闭音频会话管理（否则会报错），此时会延续后台音乐播放
}
三，转码成MP3
-(void)transformCAFToMP3{
mp3FilePath=[NSURLURLWithString:[NSTemporaryDirectory()stringByAppendingString:@"myselfRecord.mp3"]];
@try{
intread,write;
FILE*pcm=fopen([[recordUrlabsoluteString]cStringUsingEncoding:1],"rb");//source被转换的音频文件位置
fseek(pcm,4*1024,SEEK_CUR);//skipfileheader
FILE*mp3=fopen([[mp3FilePathabsoluteString]cStringUsingEncoding:1],"wb");//output输出生成的Mp3文件位置
constintPCM_SIZE=8192;
constintMP3_SIZE=8192;
shortintpcm_buffer[PCM_SIZE*2];
unsignedcharmp3_buffer[MP3_SIZE];
lame_tlame=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(shortint),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(@"%@",[exceptiondescription]);
}
@finally{
NSLog(@"MP3生成成功");
base64Str=[selfmp3ToBASE64];
}
}
四，上传需要转码BASE64
-(NSString*)mp3ToBASE64{
NSData*mp3Data=[NSDatadataWithContentsOfFile:[NSTemporaryDirectory()stringByAppendingString:@"myselfRecord.mp3"]];
NSString*_encodedImageStr=[mp3Database64Encoding];
NSLog(@"===Encodedimage:\n%@",_encodedImageStr);
return_encodedImageStr;
}
备注：其中可以直接生成的.caf .wav 有压缩的MP3需要转格式，不能直接录音生成
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。