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2014/10/15 ¤U¤È 10:11:05
iphone Programming Glossary: linearHow do I record audio on iPhone with AVAudioRecorder? http://stackoverflow.com/questions/1010343/how-do-i-record-audio-on-iphone-with-avaudiorecorder 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 set the..
how can i trace the finger movement on touch for drawing smooth curves? http://stackoverflow.com/questions/1052119/how-can-i-trace-the-finger-movement-on-touch-for-drawing-smooth-curves something like the following Collect sample points Define a NURBS curve including its knot vector Set up a system of linear equations for the samples curve Solve the system in the Least Squares sense Assuming you can pick a reasonable NURBS knot..
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 the following..
How do I translate parabolically? http://stackoverflow.com/questions/1886158/how-do-i-translate-parabolically I know how to scale translate etc. but how do I translate parabolically Is it even possible iphone animation uiview linear algebra affinetransform share improve this question To animate along a smooth curve you'll want to use a CAKeyframeAnimation...
How do I create blurred text in an iPhone view? http://stackoverflow.com/questions/227305/how-do-i-create-blurred-text-in-an-iphone-view glColor4f 1.0 5 1.0 5 1.0 5 1.0 validateTexEnv glDrawArrays GL_TRIANGLE_STRIP 0 4 Pass two accumulate two rotated linear samples glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER GL_LINEAR glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER.. glColor4f 0.5 0.5 0.5 2.0 5 validateTexEnv glDrawArrays GL_TRIANGLE_STRIP 0 4 Pass three accumulate two rotated linear samples for i 0 i 4 i tmpquad i .x quad i .s 0.5 offw tmpquad i .y quad i .t 1.5 offh tmpquad i .s quad i .s 0.5 offw tmpquad..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew p1 and p3 and p2 and p4. Now notice the x y factor in the transformation. This indicates such a transform is not linear. Therefore CATransform3D cannot perform this as a 2D transform either. However the vector x y z w 1 will be converted to..
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 iLBC internet Low Bitrate Codec for speech ~ kAudioFormatiLBC IMA ADPCM IMA4 ~ kAudioFormatAppleIMA4 linear PCM ~ kAudioFormatLinearPCM µ law ~ kAudioFormatULaw a law ~ kAudioFormatALaw You may try one of these formats or use an..
Gradients on UIView and UILabels On iPhone [duplicate] http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone
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..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader methods see the end of this message for the alternate version comparison outputs. I personally prefer the original linear version but have decided to post it in case someone can improve on the algorithm used. You'll need these imports #import..
How to create custom easing function with Core Animation? http://stackoverflow.com/questions/5161465/how-to-create-custom-easing-function-with-core-animation and joining four line segments which goes back and forth but that shouldn't be necessary. After all it's just a simple linear function which maps time values to positions. I hope I'm making sense here. iphone cocoa touch core animation tween share.. value fromValue block time toValue fromValue values addObject NSNumber numberWithDouble value time timeStep we want linear animation between keyframes with equal time steps animation.calculationMode kCAAnimationLinear set keyframes and we're done..
http://stackoverflow.com/questions/5525436/xcode-could-not-find-a-valid-private-certificate-valid-key-pair-for-this-profile
How can I optimize the rendering of a large model in OpenGL ES 1.1? http://stackoverflow.com/questions/5718846/how-can-i-optimize-the-rendering-of-a-large-model-in-opengl-es-1-1 the size of the geometry being sent to the GPU . Whatever you can do to shrink the geometry size can lead to an almost linear reduction in rendering time in my experience. These tuning steps have worked for me in the past If you're not already you..
How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation? http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener The estimated GPU cycle count for this shader is 8 cycles. The change in render time based on cycle count doesn't seem linear. Finally if I just output a constant color precision mediump float void main gl_FragColor vec4 0.5 0.5 0.5 1.0 the rendering.. main gl_FragColor vec4 0.5 0.5 0.5 1.0 the rendering time drops to 1.1 2.3 ms on iPad 1 1.3 ms on iPhone 4 . The nonlinear scaling in rendering time and sudden change between iPad and iPhone 4 for the second shader makes me think that there's..
Distance moved by Accelerometer http://stackoverflow.com/questions/6645126/distance-moved-by-accelerometer iphone xcode accelerometer distance share improve this question You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why Google Tech Talk at..
Need to find Distance using Gyro+Accelerometer http://stackoverflow.com/questions/6647314/need-to-find-distance-using-gyroaccelerometer total displacement you just do dl sqrt dx dx dy dy dz dz Gyroscope is not necessary for this but if you are measuring linear distances you can use the gyroscope reading to control that rotation of the device was not too large. If rotation was too..
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..
Record the drawing as a m4v video file - OpenGL http://stackoverflow.com/questions/9661259/record-the-drawing-as-a-m4v-video-file-opengl the texture name. glBindTexture GL_TEXTURE_2D brushTexture Set the texture parameters to use a minifying filter and a linear filer weighted average glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER GL_LINEAR Specify a 2D texture image providing..
Proper AVAudioRecorder Settings for Recording Voice? http://stackoverflow.com/questions/2149280/proper-avaudiorecorder-settings-for-recording-voice numberWithInt 44100.0 AVSampleRateKey NSNumber numberWithInt 2 AVNumberOfChannelsKey NSNumber numberWithInt 16 AVLinearPCMBitDepthKey NSNumber numberWithBool NO AVLinearPCMIsBigEndianKey NSNumber numberWithBool NO AVLinearPCMIsFloatKey nil.. numberWithInt 2 AVNumberOfChannelsKey NSNumber numberWithInt 16 AVLinearPCMBitDepthKey NSNumber numberWithBool NO AVLinearPCMIsBigEndianKey NSNumber numberWithBool NO AVLinearPCMIsFloatKey nil or defaultSettings AVFormatIDKey 1768775988 AVLinearPCMBitDepthKey.. 16 AVLinearPCMBitDepthKey NSNumber numberWithBool NO AVLinearPCMIsBigEndianKey NSNumber numberWithBool NO AVLinearPCMIsFloatKey nil or defaultSettings AVFormatIDKey 1768775988 AVLinearPCMBitDepthKey 16 AVLinearPCMIsBigEndianKey 0 AVLinearPCMIsFloatKey..
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.. audio 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.. 5.15 4.75 kbit s generated frame length 244 204 159 148 134 118 103 95 bits per frame format mFormatID kAudioFormatLinearPCM format mSampleRate 8000.0 8 kHz format mFramesPerPacket 1 1 frame per packet format mChannelsPerFrame 1 Mono format mBytesPerFrame..
What video formats are compatible with the assets library? http://stackoverflow.com/questions/3257224/what-video-formats-are-compatible-with-the-assets-library requested 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..
Setting sounds for local notifications on a 3G iPhone running iOS4 http://stackoverflow.com/questions/3716966/setting-sounds-for-local-notifications-on-a-3g-iphone-running-ios4
http://stackoverflow.com/questions/4145623/ios-create-an-mp3-on-device . I 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..
2 mp3 sounds at the same time in iphone? http://stackoverflow.com/questions/5026105/2-mp3-sounds-at-the-same-time-in-iphone format 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..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader 0 NSDictionary outputSettingsDict NSDictionary alloc initWithObjectsAndKeys NSNumber numberWithInt kAudioFormatLinearPCM AVFormatIDKey NSNumber numberWithInt 44100.0 AVSampleRateKey Not Supported NSNumber numberWithInt 2 AVNumberOfChannelsKey.. Not Supported NSNumber numberWithInt 2 AVNumberOfChannelsKey Not Supported NSNumber numberWithInt 16 AVLinearPCMBitDepthKey NSNumber numberWithBool NO AVLinearPCMIsBigEndianKey NSNumber numberWithBool NO AVLinearPCMIsFloatKey.. AVNumberOfChannelsKey Not Supported NSNumber numberWithInt 16 AVLinearPCMBitDepthKey NSNumber numberWithBool NO AVLinearPCMIsBigEndianKey NSNumber numberWithBool NO AVLinearPCMIsFloatKey NSNumber numberWithBool NO AVLinearPCMIsNonInterleaved..
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