腾讯云实时音视频同步的录音PCM文件转MP3格式

试了很多次，腾讯云录音时分辨率需要设置22050.0

@try {

        FILE*fwav =fopen([wavPathc StringUsingEncoding:NSASCIIStringEncoding],"rb");

        fseek(fwav, 1024*4, SEEK_CUR); //跳过源文件的信息头，不然在开头会有爆破音

        FILE*fmp3 =fopen([mp3Path cStringUsingEncoding:NSASCIIStringEncoding],"wb");

        lame=lame_init();

        lame_set_in_samplerate(lame, 22050.0); //设置wav的采样率

//        lame_set_num_channels(lame, 2); //声道，不设置默认为双声道

        lame_set_brate(lame, 16);//比特率

        lame_set_VBR(lame, vbr_default);

        lame_init_params(lame);

//        const int PCM_SIZE = 640 * 2; //双声道*2 单声道640即可

//        const int MP3_SIZE = 8800; //计算公式wav_buffer.length * 1.25 + 7200

        const intPCM_SIZE =8192;//双声道*2 单声道640即可

        const int MP3_SIZE = 8192; //计算公式wav_buffer.length * 1.25 + 7200

        short int pcm_buffer[PCM_SIZE*2];

        unsigned char mp3_buffer[MP3_SIZE];

        int read, write;

        do{

            read =fread(pcm_buffer,sizeof(shortint), PCM_SIZE, fwav);

            if(read ==0) {

                write =lame_encode_flush(lame, mp3_buffer, MP3_SIZE);

            }else{

                write =lame_encode_buffer_interleaved(lame, pcm_buffer, read/2, mp3_buffer, MP3_SIZE);

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

            }

            fwrite(mp3_buffer, write,1, fmp3);

        }while(read !=0);

        lame_close(lame);

        fclose(fmp3);

        fclose(fwav);

    }@catch(NSException *exception) {

        NSLog(@"catch exception");

    }@finally{

        block();

    }