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PORTP streaming using AudioQueue
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Id
16792589
data
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0
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CreationDate
2013-05-28T12:51:59.203
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2013-11-06T15:08:22.143
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<p>I have set up an audioQueue with audio format kAudioFormatMPEG4AAC (which I believe is AAC-LC). I'm looking for some code to send those AAC packets over RTP (does I just need to add a header ?) and a tip to make a good SDP because I don't find any documentation about iphone AAC hardware encoder. I tried this without success :</p> <pre><code>-(OSStatus) initializeAQ{ aqData.mDataFormat.mSampleRate = 44100; aqData.mDataFormat.mFormatID = kAudioFormatMPEG4AAC; aqData.mDataFormat.mFormatFlags = 0; aqData.mDataFormat.mBytesPerPacket = 0; // 0 for VBR aqData.mDataFormat.mFramesPerPacket = 1024; aqData.mDataFormat.mBytesPerFrame = 0; // 0 for compressed format aqData.mDataFormat.mChannelsPerFrame = 1; aqData.mDataFormat.mBitsPerChannel = 0; // 0 for compressed format aqData.bufferByteSize = 0x1388; // quite random AudioQueueNewInput(&aqData.mDataFormat, HandleInputBuffer, &aqData, CFRunLoopGetMain(), kCFRunLoopCommonModes, 0, &aqData.mQueue); aqData.mCurrentPacket = 0; aqData.mIsRunning = true; //--- prepare set of audio queue buffers ---// for(int i = 0 ; i < nBuffer ; i++){ AudioQueueAllocateBuffer(aqData.mQueue, aqData.bufferByteSize, &aqData.mBuffers[i]); AudioQueueEnqueueBuffer(aqData.mQueue, aqData.mBuffers[i], 0, NULL); } NSLog(@"starting audio queue"); //--- start ---// return AudioQueueStart(aqData.mQueue, NULL); } static void HandleInputBuffer( void *aqData, AudioQueueRef inAq, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc ) { AQRecorderState *pAqData = (AQRecorderState*) aqData; if( inNumPackets == 0 && pAqData->mDataFormat.mBytesPerPacket != 0 ){ inNumPackets = inBuffer->mAudioDataByteSize/pAqData->mDataFormat.mBytesPerPacket; } UInt32 x = 0; for(; x < inNumPackets ; x++){ SInt64 offset = inPacketDesc[x].mStartOffset; UInt32 len = inPacketDesc[x].mDataByteSize; unsigned char *packet[len]; bzero(packet, len); memcpy(packet,(unsigned char*)(inBuffer->mAudioData)+offset,len); NSData* data = [[NSData alloc]initWithBytes:packet length:len]; //[s send:data]; [s send:data withTime:inStartTime->mHostTime]; } AudioQueueEnqueueBuffer(pAqData->mQueue,inBuffer,0,NULL); } </code></pre> <p>send() add a RTP header like <a href="http://www.siptutorial.net/RTP/header.html" rel="nofollow">this one</a> and send the packet over udp.</p>
Tags
<iphone><ios><audio><audio-streaming><rtp>
Title
RTP streaming using AudioQueue
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1. This table or related slice is empty.
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1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USHaneTV
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1. PL
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1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. This table or related slice is empty.
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