implementing record audio and play in another iDevices

Question

I want to record audio and streaming on another iPhone. Is this format correct for record and streaming?

format -> mSampleRate = 44100.00; //
    format -> mFormatID = kAudioFormatLinearPCM; //
    format -> mFramesPerPacket = 1;
    format -> mChannelsPerFrame = 1; //
    format -> mBitsPerChannel = 16; //
    format -> mReserved = 0;
    format -> mBytesPerPacket = 2;
    format -> mBytesPerFrame = 2;
    format -> mFormatFlags =  kLinearPCMFormatFlagIsSignedInteger | kLinearPCMFormatFlagIsPacked;

call for start recording:

- (void) startRecordingInQueue {
    [self setupAudioFormat:&recordState.dataFormat];

    recordState.currentPacket = 0;

    OSStatus status;

    status = AudioQueueNewInput(&recordState.dataFormat, AudioInputCallback, &recordState, CFRunLoopGetCurrent(),kCFRunLoopCommonModes, 0, &recordState.queue);



    status = 0;
    if(status == 0) {
        //Prime recording buffers with empty data
        AudioQueueBufferRef buffer;
        for (int i=0; i < NUM_BUFFERS; i++) {


            AudioQueueAllocateBuffer(recordState.queue, SAMPLERATE, &recordState.buffers[i]);
            AudioQueueEnqueueBuffer(recordState.queue, recordState.buffers[i], 0, NULL);

        }

        status = AudioFileCreateWithURL(fileURL, kAudioFileAIFFType, &recordState.dataFormat, kAudioFileFlags_EraseFile, &recordState.audioFile);


        NSLog(@"ss %i",status);
        status = 0;
        if (status == 0) {
            recordState.recording = true;
            status = AudioQueueStart(recordState.queue, NULL);

            if(status == 0) {
                NSLog(@"-----------Recording--------------");
                NSLog(@"File URL : %@", fileURL);
                NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",fileURL] relativeToURL:NULL];
                [[NSUserDefaults standardUserDefaults] setURL:url forKey:@"fileUrl"];
                [[NSUserDefaults standardUserDefaults] synchronize];
            }
        }
    }

    if (status != 0) {
        [self stopRecordingInQueue];
    }
}

if it ok،

How to get out audio buffer data for sending to the server in this code? And how to play its data in other devices?

void AudioInputCallback(void * inUserData,
                        AudioQueueRef inAQ,
                        AudioQueueBufferRef inBuffer,
                        const AudioTimeStamp * inStartTime,
                        UInt32 inNumberPacketDescriptions,
                        const AudioStreamPacketDescription * inPacketDescs)

{

    RecordState * recordState = (RecordState*)inUserData;

    if (!recordState->recording)
    {
        printf("Not recording, returning\n");
    }

    printf("Writing buffer %lld\n", recordState->currentPacket);
    OSStatus status = AudioFileWritePackets(recordState->audioFile,
                                            false,
                                            inBuffer->mAudioDataByteSize,
                                            inPacketDescs,
                                            recordState->currentPacket,
                                            &inNumberPacketDescriptions,
                                            inBuffer->mAudioData);




    if (status == 0)
    {
        recordState->currentPacket += inNumberPacketDescriptions;


        AudioQueueEnqueueBuffer(recordState->queue, inBuffer, 0, NULL);


    }
}

if anyone has complete code for this project please link me to source. thanks

yes, already played: NSData * audioData = [NSData dataWithBytes:inBuffer->mAudioData length:inBuffer->mAudioDataByteSize]; on mac and good working... — iEhsan, Feb 26 '18 at 11:49
In simulator it's working, but not in real device. am I correct — Naresh, Feb 26 '18 at 11:51
no, I exported this NSData via web socket and saved files and played the raw files with Audacity(mac) and well worked without any noise. — iEhsan, Feb 26 '18 at 11:54
@iOS I want to know using the wich code to play this NSData(raw PCM file) in Objective-C? — iEhsan, Feb 26 '18 at 11:56
Follow this link. https://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder — Naresh, Feb 26 '18 at 12:01
@iOS thanks, i checked that link. but I'm want to do real-time play the audio Simultaneous with received the linear audio data. — iEhsan, Feb 26 '18 at 12:07
@iOS it is saved audio file .caf, but I how to do saving the raw data when is open and continuous receiving! — iEhsan, Feb 26 '18 at 12:23
.caf is default formate, you convert that formate in to .wav. It can play in any device. — Naresh, Feb 26 '18 at 12:38
@iOS can you fix my code? because I'm really don't know to fix it. more than a month so I'm working on this project but still not fix it :( — iEhsan, Feb 26 '18 at 13:14

score 0 · Answer 1 · answered Feb 26 '18 at 13:14

This one of my code you try it to change the formate

Here I stopped the audio recording after that I'm sending to server. This is my requirement. For this I'm converting audio file into .wav. After sending into server also it's playing successfully. Try it...

- (IBAction)stop:(id)sender { // On tap stop button

NSString *urlString;

NSLog(@"Stop Recording");
if ([audioRecorder isRecording]) // If recording audio 
{
    [audioRecorder stop]; //Stop it 
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
    [audioSession setActive:NO error:nil];

    NSLog(@"%@", audioRecorder.url); 

    unsigned long long size = [[NSFileManager defaultManager] attributesOfItemAtPath:[audioRecorder.url path] error:nil].fileSize;//Get audio file path
    NSLog(@"This is the file size of the recording in bytes: %llu", size); // Audio file size in bytes

Here my file saved in documents directory with filename "Audio". So no fetched that file and I changed file name into 56e254fa816e8_1519650589.wav and I'm sending that file to server.

    self.sendFileName = [@"56e254fa816e8" stringByAppendingString:@"_"];
    self.sendFileName = [self.sendFileName stringByAppendingString:[@(self.unixTimeStamp) stringValue]];
    self.sendFileName = [self.sendFileName stringByAppendingString:@".wav"]; // Here name converted in to .wav completely

    NSLog(@"%@", self.sendFileName);//See here the file formate

    urlString = [audioRecorder.url.absoluteString stringByReplacingOccurrencesOfString:@"Audio" withString:self.sendFileName];

    self.sendingURL = [NSURL URLWithString:urlString];

    NSLog(@"%@", self.sendingURL);//Complete file url

}

}

Try this...

thanks but I want to record in iDevice and Simultaneous play to another iDevice. — iEhsan, Feb 26 '18 at 13:20
more accurate question : https://stackoverflow.com/questions/48988348/how-to-play-pcm-raw-audio-data-simultaneous-with-received-from-web-socket-in-obj — iEhsan, Feb 26 '18 at 13:30

implementing record audio and play in another iDevices

1 Answers1