2014/10/15 下午 10:04:14

iphone Programming Glossary: audiostreambasicdescription

Writing video + generated audio to AVAssetWriterInput, audio stuttering

http://stackoverflow.com/questions/12187124/writing-video-generated-audio-to-avassetwriterinput-audio-stuttering

rateDenominator 44100 rateMultiplier rateDenominator frameRate sample_position_ 0 audio_fmt_desc_ nil int nchannels 2 AudioStreamBasicDescription audioFormat bzero audioFormat sizeof audioFormat audioFormat.mSampleRate 44100 audioFormat.mFormatID kAudioFormatLinearPCM..

How do I synthesize sounds with CoreAudio on iPhone/Mac

http://stackoverflow.com/questions/1361148/how-do-i-synthesize-sounds-with-coreaudio-on-iphone-mac

#define BUFFER_COUNT 3 static AudioQueueRef audioQueue void SetupAudioQueue OSStatus err noErr Setup the audio device. AudioStreamBasicDescription deviceFormat deviceFormat.mSampleRate 44100 deviceFormat.mFormatID kAudioFormatLinearPCM deviceFormat.mFormatFlags kLinearPCMFormatFlagIsSignedInteger..

where to start with audio synthesis on iPhone

http://stackoverflow.com/questions/2067267/where-to-start-with-audio-synthesis-on-iphone

userData pThis queueCallback outAQ outBuffer void queueCallback AudioQueueRef outAQ AudioQueueBufferRef outBuffer AudioStreamBasicDescription m_outFormat AudioQueueRef m_outAQ enum kBufferSizeInFrames 512 kNumBuffers 4 kSampleRate 44100 AudioQueueBufferRef m_buffers..

Data format from recording using Audio Queue framework

http://stackoverflow.com/questions/3963827/data-format-from-recording-using-audio-queue-framework

that the endianess the signedness etc. of what you are getting match what the library expects. Use mFormatFlags of AudioStreamBasicDescription to determine the source format. Then you might have to convert the samples e.g. newSample sample 0x8000 share improve..

Drawing waveform with AVAssetReader

http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader

i 0 i formatDesc count i CMAudioFormatDescriptionRef item CMAudioFormatDescriptionRef formatDesc objectAtIndex i const AudioStreamBasicDescription fmtDesc CMAudioFormatDescriptionGetStreamBasicDescription item if fmtDesc sampleRate fmtDesc mSampleRate channelCount fmtDesc.. i 0 i formatDesc count i CMAudioFormatDescriptionRef item CMAudioFormatDescriptionRef formatDesc objectAtIndex i const AudioStreamBasicDescription fmtDesc CMAudioFormatDescriptionGetStreamBasicDescription item if fmtDesc sampleRate fmtDesc mSampleRate channelCount fmtDesc..

AudioUnits causing universal skipping after returning from Springboard

http://stackoverflow.com/questions/6130443/audiounits-causing-universal-skipping-after-returning-from-springboard

Load OSStatus tErr noErr AudioComponentInstance tRIO AudioComponentDescription tRIOCD AURenderCallbackStruct tRIOCB AudioStreamBasicDescription tAUF tRIOCD.componentType kAudioUnitType_Output tRIOCD.componentSubType kAudioUnitSubType_RemoteIO tRIOCD.componentManufacturer..

How to reverse an audio file?

http://stackoverflow.com/questions/6593118/how-to-reverse-an-audio-file

of the data you have reversed the data and playing will be reversed. set up output file AudioFileID outputAudioFile AudioStreamBasicDescription myPCMFormat myPCMFormat.mSampleRate 16000.00 myPCMFormat.mFormatID kAudioFormatLinearPCM myPCMFormat.mFormatFlags kAudioFormatFlagsCanonical.. outputAudioFile set up input file AudioFileID inputAudioFile OSStatus theErr noErr UInt64 fileDataSize 0 AudioStreamBasicDescription theFileFormat UInt32 thePropertySize sizeof theFileFormat theErr AudioFileOpenURL __bridge CFURLRef self.recordedAudioUrl..

Write Audio To Disk From IO Unit

http://stackoverflow.com/questions/6930609/write-audio-to-disk-from-io-unit

kCFURLPOSIXPathStyle false OSStatus status prepare a 16 bit int file format sample channel count and sample rate AudioStreamBasicDescription dstFormat dstFormat.mSampleRate 44100.0 dstFormat.mFormatID kAudioFormatLinearPCM dstFormat.mFormatFlags kAudioFormatFlagsNativeEndian.. format from the queue status ExtAudioFileSetProperty recordingfileref kExtAudioFileProperty_ClientDataFormat sizeof AudioStreamBasicDescription stereoStreamFormat CheckError status couldnt set input format ExtAudioFileSeek recordingfileref 0 isrecording YES documentsDirectory..

How to record sound produced by mixer unit output (iOS Core Audio & Audio Graph)

http://stackoverflow.com/questions/7118429/how-to-record-sound-produced-by-mixer-unit-output-ios-core-audio-audio-graph

result return If anyone have an idea ... EDIT Solution 3 thanks to arlo anwser There is now a format problem AudioStreamBasicDescription dstFormat 0 dstFormat.mSampleRate 44100.0 dstFormat.mFormatID kAudioFormatLinearPCM dstFormat.mFormatFlags kAudioFormatFlagsNativeEndian.. for writing setupErr ExtAudioFileSetProperty effectState.audioFileRef kExtAudioFileProperty_ClientDataFormat sizeof AudioStreamBasicDescription stereoStreamFormat NSAssert setupErr noErr @ Couldn't create file for format setupErr ExtAudioFileWriteAsync effectState.audioFileRef.. an alternative you can convert the data using the Audio Converter Services . First define the input and output formats AudioStreamBasicDescription monoCanonicalFormat size_t bytesPerSample sizeof AudioUnitSampleType monoCanonicalFormat.mFormatID kAudioFormatLinearPCM..

AudioQueue how to find out playback length of queued data

http://stackoverflow.com/questions/7375309/audioqueue-how-to-find-out-playback-length-of-queued-data

UInt64 _framesPerPacket UInt64 _totalPackets UInt64 fileDataSize AudioFilePacketTableInfo _packetInfo int _fileLength AudioStreamBasicDescription _fileDataFormat NSFileHandle _fileHandle int _packetOffset int _totalReadBytes int _maxPacketSize BOOL firstTime BOOL _ism4a..

Application crashed while importing songs from Ipod library in Iphone for iOs 5.0

http://stackoverflow.com/questions/8077725/application-crashed-while-importing-songs-from-ipod-library-in-iphone-for-ios-5

AVMediaTypeAudio AVAssetTrack track tracks objectAtIndex 0 id desc track.formatDescriptions objectAtIndex 0 const AudioStreamBasicDescription audioDesc CMAudioFormatDescriptionGetStreamBasicDescription CMAudioFormatDescriptionRef desc FourCharCode formatID audioDesc.. AVMediaTypeAudio AVAssetTrack track tracks objectAtIndex 0 id desc track.formatDescriptions objectAtIndex 0 const AudioStreamBasicDescription audioDesc CMAudioFormatDescriptionGetStreamBasicDescription CMAudioFormatDescriptionRef desc FourCharCode formatID audioDesc..

Can anybody help me in recording iPhone output sound through Audio Unit

http://stackoverflow.com/questions/8615358/can-anybody-help-me-in-recording-iphone-output-sound-through-audio-unit

kAudioOutputUnitProperty_EnableIO kAudioUnitScope_Output kOutputBus flag sizeof flag Describe format AudioStreamBasicDescription audioFormat 0 audioFormat.mSampleRate 44100.00 audioFormat.mFormatID kAudioFormatLinearPCM audioFormat.mFormatFlags kAudioFormatFlagIsSignedInteger.. for writing setupErr ExtAudioFileSetProperty effectState.audioFileRef kExtAudioFileProperty_ClientDataFormat sizeof AudioStreamBasicDescription audioFormat NSAssert setupErr noErr @ Couldn't create file for format setupErr ExtAudioFileWriteAsync effectState.audioFileRef..