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2014/10/15 ¤U¤È 10:05:05

iphone Programming Glossary: channels

How do I record audio on iPhone with AVAudioRecorder?

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

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 how to..

iphone - AVAudioRecorder gives mono playback (sound playing in just one channel)

http://stackoverflow.com/questions/1141592/iphone-avaudiorecorder-gives-mono-playback-sound-playing-in-just-one-channel

recordSetting setValue NSNumber numberWithBool NO forKey AVLinearPCMIsFloatKey Even after specifying the number of channels as 2 the playback is mono i.e. playing in only 1 ear jack instead of both the channels . Has anyone else faced this issue.. after specifying the number of channels as 2 the playback is mono i.e. playing in only 1 ear jack instead of both the channels . Has anyone else faced this issue Is there anything wrong with the recordSetting dictionary values Thanks Can anyone please.. with the recordSetting dictionary values Thanks Can anyone please help me with this... If I specify the number of channels as 2 why would the playback be in just one jack I am using headphones for testing the ones which came with my iPhone iphone..

color replacement in image for iphone application

http://stackoverflow.com/questions/15082025/color-replacement-in-image-for-iphone-application

to be provided. 5 cvMerge the new image with the new hue with an image composed by the saturation and brightness channels that you saved in step one. i understand that cvMerge will merge three channel of H S and V but how i can use output of..

Good way to calculate 'brightness' of UIImage?

http://stackoverflow.com/questions/3992790/good-way-to-calculate-brightness-of-uiimage

share improve this question The most flexible way is to generate a histogram for the red green and blue color channels and then use it to determine the average lightness median lightness black white points contrast or other custom functions...

Batch optimization of PNGs for iphone/ipad display as xcode does

http://stackoverflow.com/questions/4584467/batch-optimization-of-pngs-for-iphone-ipad-display-as-xcode-does

It appears that the above command uses a modified version of pngcrush to optimize pngs and transform the color channels Developer Platforms iPhoneOS.platform Developer usr bin pngcrush iphone f 0 orig.png optimized.png And the optimization..

Determining Image Luminance/Brightness

http://stackoverflow.com/questions/4876315/determining-image-luminance-brightness

R 0.587 G 0.144 B to get the luma channel and then calculate the average. R G and B represent the red green and blue channels respectively. EDIT Note that it is possible that your camera will compensate for bright dark scenes by modifying its aperture...

Drawing waveform with AVAssetReader

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

item if fmtDesc sampleRate fmtDesc mSampleRate channelCount fmtDesc mChannelsPerFrame NSLog @ channels u bytes packet u sampleRate f fmtDesc mChannelsPerFrame fmtDesc mBytesPerPacket fmtDesc mSampleRate UInt32 bytesPerSample.. item if fmtDesc sampleRate fmtDesc mSampleRate channelCount fmtDesc mChannelsPerFrame NSLog @ channels u bytes packet u sampleRate f fmtDesc mChannelsPerFrame fmtDesc mBytesPerPacket fmtDesc mSampleRate UInt32 bytesPerSample..

Getting RGB pixel data from CGImage

http://stackoverflow.com/questions/6073259/getting-rgb-pixel-data-from-cgimage

a bunch of relevant info about an image as well as a dump of the image's pixel data. It will work on images with alpha channels as well as images without. The code will even work on images that are not in the RGB color space though I doubt you'd be..

OpenGL ES 2.0 / MonoTouch: Texture is colorized red

http://stackoverflow.com/questions/7986153/opengl-es-2-0-monotouch-texture-is-colorized-red

application but it's shown in a red tone. Edit The channel problem is also present when using 2D Textures it seems the channels are not in the correct order. Is there any way to change the order of the channels using the iOS methods That's the code.. when using 2D Textures it seems the channels are not in the correct order. Is there any way to change the order of the channels using the iOS methods That's the code for texture loading public TextureCube Generic3DView device UIImage right UIImage.. 0.0f imageSize.Width imageSize.Height ctxt.DrawImage rect inImage.CGImage var data ctxt.Data return data I think the channels are inverted but maybe there is a way to invert the bitmap without some custom code. This is the image which is rendered..

How to change a particular color in an image?

http://stackoverflow.com/questions/8046643/how-to-change-a-particular-color-in-an-image

to apply the new hue. cvMerge the new image with the new hue with an image composed by the saturation and brightness channels that you saved in step one. There are several OpenCV iOS ports in the net eg http www.eosgarden.com en opensource opencv..

iOS Stream Audio from one iOS Device to Another

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

the set up of 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.. 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 per packet probably 1 . Your..

iOS - How to achieve emboss effect for the text on UILabel?

http://stackoverflow.com/questions/8467141/ios-how-to-achieve-emboss-effect-for-the-text-on-uilabel

draw a shadow that only appears around the inside edges of the string. This image just has an alpha channel and no RGB channels. UIImage maskWithString NSString string font UIFont font size CGSize size CGRect rect CGPointZero size CGFloat scale UIScreen..

Combine two .wav files in iPhone using Objective C

http://stackoverflow.com/questions/8504620/combine-two-wav-files-in-iphone-using-objective-c

stringWithFormat @ tempRecordingFile. @ @ wav long totalAudioLen 0 long totalDataLen 0 long longSampleRate 11025.0 int channels 2 long byteRate 16 11025.0 channels 8 NSData wav1Data NSData dataWithContentsOfFile originalFileName path NSData wav2Data.. @ @ wav long totalAudioLen 0 long totalDataLen 0 long longSampleRate 11025.0 int channels 2 long byteRate 16 11025.0 channels 8 NSData wav1Data NSData dataWithContentsOfFile originalFileName path NSData wav2Data NSData dataWithContentsOfFile temporaryFileName.. 16 16 4 bytes size of 'fmt ' chunk header 17 0 header 18 0 header 19 0 header 20 1 format 1 header 21 0 header 22 Byte channels header 23 0 header 24 Byte longSampleRate 0xff header 25 Byte longSampleRate 8 0xff header 26 Byte longSampleRate 16 0xff..