1 - (void)startRecord
2 {
3 //删除上次生成的文件,保留最新文件
4 NSFileManager *fileManager = [NSFileManager defaultManager];
5 if ([NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]) {
6 [fileManager removeItemAtPath:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"] error:nil];
7 }
8 if ([NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"]) {
9 [fileManager removeItemAtPath:[NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"] error:nil];
10 }
11
12 //开始录音
13 //录音设置
14 NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];
15 //设置录音格式 AVFormatIDKey==kAudioFormatLinearPCM
16 [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
17 //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
18 [recordSetting setValue:[NSNumber numberWithFloat:11025.0] forKey:AVSampleRateKey];
19 //录音通道数 1 或 2 ,要转换成mp3格式必须为双通道
20 [recordSetting setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
21 //线性采样位数 8、16、24、32
22 [recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
23 //录音的质量
24 [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey];
25
26 //存储录音文件
27 recordUrl = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"]];
28
29 //初始化
30 audioRecorder = [[AVAudioRecorder alloc] initWithURL:recordUrl settings:recordSetting error:nil];
31 //开启音量检测
32 audioRecorder.meteringEnabled = YES;
33 audioSession = [AVAudioSession sharedInstance];//得到AVAudioSession单例对象
34
35 if (![audioRecorder isRecording]) {
36 [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];//设置类别,表示该应用同时支持播放和录音
37 [audioSession setActive:YES error:nil];//启动音频会话管理,此时会阻断后台音乐的播放.
38
39 [audioRecorder prepareToRecord];
40 [audioRecorder peakPowerForChannel:0.0];
41 [audioRecorder record];
42 }
43 }
1 - (void)endRecord
2 {
3 [audioRecorder stop]; //录音停止
4 [audioSession setActive:NO error: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
5 }
1 - (void)transformCAFToMP3 {
2 mp3FilePath = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]];
3
4 @try {
5 int read, write;
6
7 FILE *pcm = fopen([[recordUrl absoluteString] cStringUsingEncoding:1], "rb"); //source 被转换的音频文件位置
8 fseek(pcm, 4*1024, SEEK_CUR); //skip file header
9 FILE *mp3 = fopen([[mp3FilePath absoluteString] cStringUsingEncoding:1], "wb"); //output 输出生成的Mp3文件位置
10
11 const int PCM_SIZE = 8192;
12 const int MP3_SIZE = 8192;
13 short int pcm_buffer[PCM_SIZE*2];
14 unsigned char mp3_buffer[MP3_SIZE];
15
16 lame_t lame = lame_init();
17 lame_set_in_samplerate(lame, 11025.0);
18 lame_set_VBR(lame, vbr_default);
19 lame_init_params(lame);
20
21 do {
22 read = (int)fread(pcm_buffer, 2*sizeof(short int), PCM_SIZE, pcm);
23 if (read == 0)
24 write = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
25 else
26 write = lame_encode_buffer_interleaved(lame, pcm_buffer, read, mp3_buffer, MP3_SIZE);
27
28 fwrite(mp3_buffer, write, 1, mp3);
29
30 } while (read != 0);
31
32 lame_close(lame);
33 fclose(mp3);
34 fclose(pcm);
35 }
36 @catch (NSException *exception) {
37 NSLog(@"%@",[exception description]);
38 }
39 @finally {
40 NSLog(@"MP3生成成功");
41 base64Str = [self mp3ToBASE64];
42 }
43 }
1 - (NSString *)mp3ToBASE64{
2 NSData *mp3Data = [NSData dataWithContentsOfFile:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]];
3 NSString *_encodedImageStr = [mp3Data base64Encoding];
4 NSLog(@"===Encoded image:\n%@", _encodedImageStr);
5 return _encodedImageStr;
6 }