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2014/10/15 ¤U¤È 10:12:32

iphone Programming Glossary: pcm

playing a .caf file: works fine in simulator but not in iPhone

http://stackoverflow.com/questions/1363972/playing-a-caf-file-works-fine-in-simulator-but-not-in-iphone

back .caf files encoded one way but not another... a bit of trial and error will help here I ended up using 16BLE PCM . I would try altering the recorded audio file's encoding in an attempt to find an audio codec supported by the device...

Supported Audio file formats in iPhone

http://stackoverflow.com/questions/1761460/supported-audio-file-formats-in-iphone

Rate a format for speech ALAC Apple Lossless iLBC internet Low Bitrate Codec another format for speech IMA4 IMA ADPCM linear PCM uncompressed µ law and a law MP3 MPEG 1 audio layer 3 The audio recording formats supported in iPhone OS are.. format for speech ALAC Apple Lossless iLBC internet Low Bitrate Codec another format for speech IMA4 IMA ADPCM linear PCM uncompressed µ law and a law MP3 MPEG 1 audio layer 3 The audio recording formats supported in iPhone OS are the following..

Sound on simulator but not device

http://stackoverflow.com/questions/2014578/sound-on-simulator-but-not-device

constratints. Sound files that you play using this function must be No longer than 30 seconds in duration In linear PCM or IMA4 IMA ADPCM format Packaged in a .caf .aif or .wav file From Apple docs http developer.apple.com library ios #documentation.. files that you play using this function must be No longer than 30 seconds in duration In linear PCM or IMA4 IMA ADPCM format Packaged in a .caf .aif or .wav file From Apple docs http developer.apple.com library ios #documentation AudioToolbox..

How can I record AMR audio format on the iPhone?

http://stackoverflow.com/questions/276644/how-can-i-record-amr-audio-format-on-the-iphone

can I record AMR audio format on the iPhone A voice recorder doesn't need uncompressed Linear PCM audio. Compressed AMR would do fine. The iPhone framework built for recording audio is simple enough but the only examples.. is simple enough but the only examples I've found for setting up the audio format which come from Apple use LinearPCM. I've tried various other combinations of values but can't seem to get anything to work. Does anybody have any code that.. packet size frame size etc. don't seem to match up no matter what I set them to. Edit Here's what I have for the PCM version If we want to use AMR instead of PCM AMR Format Sampling Frequency 8 kHz 13 bit 160 samples for 20 ms frames filtered..

What video formats are compatible with the assets library?

http://stackoverflow.com/questions/3257224/what-video-formats-are-compatible-with-the-assets-library

in this question. iPhone iPhone iPad non Retina Retina 6119419764_orig.mov H.264 1 920 x 1 080 NO NO NO Linear PCM 16 bit little endian signed integer 48000 Hz Stereo L R 35.33 Mbit s 6119419764_hd.mp4 AVC Coding 1 280 x 720 NO YES YES..

iOS: Create an MP3 on device

http://stackoverflow.com/questions/4145623/ios-create-an-mp3-on-device

have found that there is no possibility to record directly in MP3 format. Only .caf file that may contain AIFF Linear PCM etc. I have also found here that there is an AudioConverterFillComplexBuffer function that might theoretically convert CAF..

Record and play audio Simultaneously

http://stackoverflow.com/questions/4215180/record-and-play-audio-simultaneously

Extract iPod Library raw PCM samples and play with sound effects

http://stackoverflow.com/questions/4796643/extract-ipod-library-raw-pcm-samples-and-play-with-sound-effects

iPod Library raw PCM samples and play with sound effects I am trying to extract raw PCM samples from an MP3 in the iPod Library so that I can.. iPod Library raw PCM samples and play with sound effects I am trying to extract raw PCM samples from an MP3 in the iPod Library so that I can play the song and manipulate the pitch tempo and apply sound effects.. but this is not going to cut it for me because the process is too time consuming. Surely I can just read the PCM samples into memory for playback without having to write them to disk first NB I know the code below references an mp3 within..

2 mp3 sounds at the same time in iphone?

http://stackoverflow.com/questions/5026105/2-mp3-sounds-at-the-same-time-in-iphone

sounds simultaneously playback of multiple sounds of these formats will require CPU resources for decoding. Linear PCM and IMA ADPCM IMA4 audio You can play multiple linear PCM or IMA4 format sounds simultaneously without CPU resource concerns... playback of multiple sounds of these formats will require CPU resources for decoding. Linear PCM and IMA ADPCM IMA4 audio You can play multiple linear PCM or IMA4 format sounds simultaneously without CPU resource concerns. In terms.. formats will require CPU resources for decoding. Linear PCM and IMA ADPCM IMA4 audio You can play multiple linear PCM or IMA4 format sounds simultaneously without CPU resource concerns. In terms of playing multiple sounds at once that's easy..

Is there a way to record device audio on the iPhone?

http://stackoverflow.com/questions/5670326/is-there-a-way-to-record-device-audio-on-the-iphone

Choose custom sound for local notifications

http://stackoverflow.com/questions/7170475/choose-custom-sound-for-local-notifications

this question That should work. Make sure the sound is actually in your app ™s bundle is in the correct format linear PCM or IMA4 ”pretty much anywhere that explains how to convert sounds for iOS will tell you how to do that and is under 30 seconds...

How can I compile lame as static library(.a) for armv6 and armv7 of iPhone?

http://stackoverflow.com/questions/9207063/how-can-i-compile-lame-as-static-library-a-for-armv6-and-armv7-of-iphone

.a for armv6 and armv7 of iPhone LAME http lame.sourceforge.net is a library written in c language. It can convert PCM sound files to MP3 files. I use it to convert sound files to MP3 files on iPhone. The source PCM sound files is recorded.. It can convert PCM sound files to MP3 files. I use it to convert sound files to MP3 files on iPhone. The source PCM sound files is recorded by microphone. In order to include the LAME into my XCode Project I need to compile the LAME to..

How do I record audio on iPhone with AVAudioRecorder?

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

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 how to set the AVAudioRecorder..

Data format from recording using Audio Queue framework

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

couldn't get input channel count mRecordFormat.mFormatID inFormatID if inFormatID kAudioFormatLinearPCM if we want pcm default to signed 16 bit little endian mRecordFormat.mFormatFlags kLinearPCMFormatFlagIsSignedInteger kLinearPCMFormatFlagIsPacked..

Extract iPod Library raw PCM samples and play with sound effects

http://stackoverflow.com/questions/4796643/extract-ipod-library-raw-pcm-samples-and-play-with-sound-effects

copyNextSampleBuffer What Do I Do Here assetReader release assetReaderOutput release iphone objective c mp3 ipod pcm share improve this question I'm doing something similar in my own code. The following method returns some NSData for..

Reading audio samples via AVAssetReader

http://stackoverflow.com/questions/4972677/reading-audio-samples-via-avassetreader

bufferCount .mData for int i 0 i numSamplesInBuffer i amplitude for the sample is samples i assuming you have linear pcm to start with Release the buffer when done with the samples retained by CMSampleBufferGetAudioBufferListWithRetainedblockBuffer..

PCM audio amplitude values?

http://stackoverflow.com/questions/5890499/pcm-audio-amplitude-values

it. I found webpages on the PCM file format but not what the data values are. iphone android audio audio recording pcm share improve this question Think of the surface of the microphone. When it's silent the surface is motionless at position..

Write Audio To Disk From IO Unit

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

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 remoteio And if so was I wrong to set the output format of the remote..

ExtAudioFileWrite to m4a/aac failing on dual-core devices (ipad 2, iphone 4s)

http://stackoverflow.com/questions/8719865/extaudiofilewrite-to-m4a-aac-failing-on-dual-core-devices-ipad-2-iphone-4s

to m4a aac failing on dual core devices ipad 2 iphone 4s I wrote a loop to encode pcm audio data generated by my app to aac using Extended Audio File Services. The encoding takes place in a background thread.. mBuffers 1 .mData bufferFrames ExtAudioFileWrite outFile bufferFrames writeBuffer err ExtAudioFileDispose outFile The pcm frames are properly created but ExtAudioFileWrite fails the 2nd 3rd time it is called. Any ideas Thank you iphone ios ipad..

Recording mp3 instead of caf file

http://stackoverflow.com/questions/9399019/recording-mp3-instead-of-caf-file

couldn't get input channel count mRecordFormat.mFormatID inFormatID if inFormatID kAudioFormatLinearPCM if we want pcm default to signed 16 bit little endian mRecordFormat.mFormatFlags kLinearPCMFormatFlagIsSignedInteger kLinearPCMFormatFlagIsPacked.. url copy the cookie first to give the file object as much info as we can about the data going in not necessary for pcm but required for some compressed audio CopyEncoderCookieToFile allocate and enqueue buffers bufferByteSize ComputeRecordBufferSize..