您好,登錄后才能下訂單哦!
這篇文章給大家分享的是有關(guān)iOS如何實現(xiàn)錄音轉(zhuǎn)碼MP3及轉(zhuǎn)碼BASE64上傳功能的內(nèi)容。小編覺得挺實用的,因此分享給大家做個參考,一起跟隨小編過來看看吧。
iOS 錄音轉(zhuǎn)碼MP3及轉(zhuǎn)碼BASE64上傳
一,開始錄音
NSLog(@"開始錄音"); [self startRecord]; - (void)startRecord { //刪除上次生成的文件,保留最新文件 NSFileManager *fileManager = [NSFileManager defaultManager]; if ([NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]) { [fileManager removeItemAtPath:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"] error:nil]; } if ([NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"]) { [fileManager removeItemAtPath:[NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"] error:nil]; } //開始錄音 //錄音設(shè)置 NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init]; //設(shè)置錄音格式 AVFormatIDKey==kAudioFormatLinearPCM [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey]; //設(shè)置錄音采樣率(Hz) 如:AVSampleRateKey==8000/44100/96000(影響音頻的質(zhì)量), 采樣率必須要設(shè)為11025才能使轉(zhuǎn)化成mp3格式后不會失真 [recordSetting setValue:[NSNumber numberWithFloat:11025.0] forKey:AVSampleRateKey]; //錄音通道數(shù) 1 或 2 ,要轉(zhuǎn)換成mp3格式必須為雙通道 [recordSetting setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; //線性采樣位數(shù) 8、16、24、32 [recordSetting setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey]; //錄音的質(zhì)量 [recordSetting setValue:[NSNumber numberWithInt:AVAudioQualityHigh] forKey:AVEncoderAudioQualityKey]; //存儲錄音文件 recordUrl = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"selfRecord.wav"]]; //初始化 audioRecorder = [[AVAudioRecorder alloc] initWithURL:recordUrl settings:recordSetting error:nil]; //開啟音量檢測 audioRecorder.meteringEnabled = YES; audioSession = [AVAudioSession sharedInstance];//得到AVAudioSession單例對象 if (![audioRecorder isRecording]) { [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];//設(shè)置類別,表示該應(yīng)用同時支持播放和錄音 [audioSession setActive:YES error:nil];//啟動音頻會話管理,此時會阻斷后臺音樂的播放. [audioRecorder prepareToRecord]; [audioRecorder peakPowerForChannel:0.0]; [audioRecorder record]; } }
二,停止錄音
[self endRecord]; - (void)endRecord { [audioRecorder stop]; //錄音停止 [audioSession setActive:NO error:nil]; //一定要在錄音停止以后再關(guān)閉音頻會話管理(否則會報錯),此時會延續(xù)后臺音樂播放 }
三,轉(zhuǎn)碼成MP3
- (void)transformCAFToMP3 { mp3FilePath = [NSURL URLWithString:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]]; @try { int read, write; FILE *pcm = fopen([[recordUrl absoluteString] cStringUsingEncoding:1], "rb"); //source 被轉(zhuǎn)換的音頻文件位置 fseek(pcm, 4*1024, SEEK_CUR); //skip file header FILE *mp3 = fopen([[mp3FilePath absoluteString] cStringUsingEncoding:1], "wb"); //output 輸出生成的Mp3文件位置 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"); base64Str = [self mp3ToBASE64]; } }
四,上傳需要轉(zhuǎn)碼BASE64
- (NSString *)mp3ToBASE64{ NSData *mp3Data = [NSData dataWithContentsOfFile:[NSTemporaryDirectory() stringByAppendingString:@"myselfRecord.mp3"]]; NSString *_encodedImageStr = [mp3Data base64Encoding]; NSLog(@"===Encoded image:\n%@", _encodedImageStr); return _encodedImageStr; }
備注:其中可以直接生成的.caf .wav 有壓縮的MP3需要轉(zhuǎn)格式,不能直接錄音生成
感謝各位的閱讀!關(guān)于“iOS如何實現(xiàn)錄音轉(zhuǎn)碼MP3及轉(zhuǎn)碼BASE64上傳功能”這篇文章就分享到這里了,希望以上內(nèi)容可以對大家有一定的幫助,讓大家可以學(xué)到更多知識,如果覺得文章不錯,可以把它分享出去讓更多的人看到吧!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。