2014/10/15 下午 10:14:28

iphone Programming Glossary: stereo

How do I record audio on iPhone with AVAudioRecorder?

http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder

code. Recording is triggered by the user pressing a button on the navBar. The recording uses cd quality 44100 samples stereo 2 channels linear pcm. Beware if you want to use a different format especially an encoded one make sure you fully understand..

Reading audio buffer data with AudioQueue

http://stackoverflow.com/questions/1248060/reading-audio-buffer-data-with-audioqueue

smoothly The odd numbered rows aren't anywhere near that smooth. My first thought would be that this is interleaved stereo data but no it's only one channel so there shouldn't be any interleaving right My best guess is that I'm just reading the..

Video file formats supported in iPhone

http://stackoverflow.com/questions/1535836/video-file-formats-supported-in-iphone

30 frames per second Low Complexity version of the H.264 Baseline Profile with AAC LC audio up to 160 Kbps 48kHz stereo audio in .m4v .mp4 and .mov file formats H.264 video up to 768 Kbps 320 by 240 pixels 30 frames per second Baseline Profile.. Kbps 320 by 240 pixels 30 frames per second Baseline Profile up to Level 1.3 with AAC LC audio up to 160 Kbps 48kHz stereo audio in .m4v .mp4 and .mov file formats MPEG 4 video up to 2.5 Mbps 640 by 480 pixels 30 frames per second Simple Profile.. 4 video up to 2.5 Mbps 640 by 480 pixels 30 frames per second Simple Profile with AAC LC audio up to 160 Kbps 48kHz stereo audio in .m4v .mp4 and .mov file formats Numerous audio formats including the ones listed in 𦯷udio Technologies li For information..

where to start with audio synthesis on iPhone

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

to implement sound playback using the AudioQueue API's Currently just supports playing two sine wave tones one per stereo channel. The sound data is liitle endian signed 16 bit @ 44.1KHz class BleepMachine static void staticQueueCallback void..

Proper AVAudioRecorder Settings for Recording Voice?

http://stackoverflow.com/questions/2149280/proper-avaudiorecorder-settings-for-recording-voice

only understand rates at specific steps like 32 kHz 24 kHz 16 kHz or 12 kHz. Your number of channels is set to 2 for stereo. Unless your using additional hardware the iPhone only has one microphone and 1 mono channel should be sufficient. This..

Audio Processing: Playing with volume level

http://stackoverflow.com/questions/3982723/audio-processing-playing-with-volume-level

samples in as 32 bit float. Here's an example of your code using ExtAudioAPI to handle any input file format including stereo v. mono void ScaleAudioFileAmplitude NSURL theURL float ampScale OSStatus err noErr ExtAudioFileRef audiofile ExtAudioFileOpenURL..

Write Audio To Disk From IO Unit

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

And finally I am very uncertain about what asbd to use for kExtAudioFileProperty_ClientDataFormat. I had been using my stereo stream format but a closer look at the docs says this must be pcm. Should this be the same format as the output for the.. be the same format as the output for the remoteio And if so was I wrong to set the output format of the remote io to stereostreamformat I realize there's and awful lot in this question but I have a lot of uncertainties that I cant seem to clear.. there's and awful lot in this question but I have a lot of uncertainties that I cant seem to clear up on my own. setup stereo stream format void setupStereoStreamFormat size_t bytesPerSample sizeof AudioUnitSampleType stereoStreamFormat.mFormatID..

iOS Stream Audio from one iOS Device to Another

http://stackoverflow.com/questions/8357514/ios-stream-audio-from-one-ios-device-to-another

the queue data and the format of the data you receive matches exactly. Checkout things like number of channels mono or stereo number of frames integers or floats and sample rate. If anything doesn't match up you'll either get EXC_BAD_ACCESS errors.. . It's crucial to understand that you have the most primitive unit of data either an integer or a float. Mono or stereo you have one or two channels in a frame. That defines how many integers or floats are in that frame. Then you have frames..