On Tue, Oct 30, 2012 at 11:24 PM, Pier <
email@hidden> wrote:
> Hi,
>
>
> I'm trying to write a bunch of samples to a a TPCircularBuffer, provided
> Michael Tyson by
>
http://atastypixel.com/blog/a-simple-fast-circular-buffer-implementation-for-audio-processing/comment-page-1/#comment-4988
>
>
> I am successful in playing back these recorded samples in real time.
> Something like a monitor.
>
>
> However, I wish to keep the samples in the TPCircularBuffer for later
> playback, and so I implemented 2 flags, rio->recording and rio->playing.
>
> My idea was that I would activate rio->recording to be YES using a button.
> Record for a while, and then stop recording by setting the flag to be NO.
> Theoretically, TPCircularBuffer would have my audio info saved.
>
>
> However, when I activate rio->playing to be YES in the playback Callback, I
> simply hear some jittery sound that has no semblance of what I recorded.
>
>
> Am I using the buffer correctly? Or is this usually done another way?
>
>
> Thanks.
>
>
> Pier.
>
>
>
> static OSStatus recordingCallback(void *inRefCon,
>
> AudioUnitRenderActionFlags *ioActionFlags,
>
> const AudioTimeStamp *inTimeStamp,
>
> UInt32 inBusNumber,
>
> UInt32 inNumberFrames,
>
> AudioBufferList *ioData) {
>
>
> RIO *rio = (RIO*)inRefCon;
>
> AudioUnit rioUnit = rio->theAudioUnit;
>
> //ExtAudioFileRef eaf = rio->outEAF;
>
> AudioBufferList abl = rio->audioBufferList;
>
>
>
> SInt32 samples[NUMBER_OF_SAMPLES]; // A large enough size to not have to
> worry about buffer overrun
>
> abl.mNumberBuffers = 1;
>
> abl.mBuffers[0].mData = &samples;
>
> abl.mBuffers[0].mNumberChannels = 1;
>
> abl.mBuffers[0].mDataByteSize = inNumberFrames * sizeof(SInt16);
>
>
>
> OSStatus result;
>
> result = AudioUnitRender(rioUnit,
>
> ioActionFlags,
>
> inTimeStamp,
>
> inBusNumber,
>
> inNumberFrames,
>
> &abl);
>
>
>
> if (noErr != result) { NSLog(@"Obtain recorded samples error"); }
>
>
>
> // React to a recording flag, if recording, save the abl into own
> buffer, else ignore
>
> if (rio->recording)
>
> {
>
> TPCircularBufferProduceBytes(&rio->buffer, abl.mBuffers[0].mData,
> inNumberFrames * sizeof(SInt16));
>
> NSLog(@"Recording!");
>
> }
>
> else
>
> {
>
> NSLog(@"Not Recording!");
>
> }
>
> // once stop recording save the circular buffer to a temp circular
> buffer
>
>
> return noErr;
>
> }
>
>
> static OSStatus playbackCallback(void *inRefCon,
>
> AudioUnitRenderActionFlags *ioActionFlags,
>
> const AudioTimeStamp *inTimeStamp,
>
> UInt32 inBusNumber,
>
> UInt32 inNumberFrames,
>
> AudioBufferList *ioData) {
>
>
>
> RIO *rio = (RIO*)inRefCon;
>
>
>
> int bytesToCopy = ioData->mBuffers[0].mDataByteSize;
>
> SInt16 *targetBuffer = (SInt16*)ioData->mBuffers[0].mData;
>
>
>
> // Pull audio from playthrough buffer
>
> int32_t availableBytes;
>
>
>
> if (rio->playing)
>
> {
>
> SInt16 * tempbuffer = TPCircularBufferTail(&rio->buffer,
> &availableBytes);
>
> memcpy(targetBuffer, tempbuffer, MIN(bytesToCopy, availableBytes));
>
> TPCircularBufferConsume(&rio->buffer, MIN(bytesToCopy,
> availableBytes));
>
> NSLog(@"Playing!");
>
> }
>
> else
>
> {
>
> NSLog(@"Playing silence!");
>
>
>
> for (int i = 0 ; i < ioData->mNumberBuffers; i++){
>
> //get the buffer to be filled
>
> AudioBuffer buffer = ioData->mBuffers[i];
>
> UInt32 *frameBuffer = buffer.mData;
>
>
> //loop through the buffer and fill the frames
>
> for (int j = 0; j < inNumberFrames; j++){
>
> frameBuffer[j] = 0;
>
> }
>
> }
>
> }
>
>
> return noErr;
>
> }
>