1 /* 2 File: CAAudioUnitOutputCapturer.h 3 Abstract: Part of CoreAudio Utility Classes 4 Version: 1.1 5 6 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple 7 Inc. ("Apple") in consideration of your agreement to the following 8 terms, and your use, installation, modification or redistribution of 9 this Apple software constitutes acceptance of these terms. 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APPLE 30 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 31 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 32 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 33 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 34 35 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 36 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 37 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 38 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 39 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 40 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 41 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 42 POSSIBILITY OF SUCH DAMAGE. 43 44 Copyright (C) 2014 Apple Inc. All Rights Reserved. 45 46 */ 47 #ifndef __CAAudioUnitOutputCapturer_h__ 48 #define __CAAudioUnitOutputCapturer_h__ 49 50 #include <AudioToolbox/ExtendedAudioFile.h> 51 52 /* 53 Class to capture output from an AudioUnit for analysis. 54 55 example: 56 57 CFURL fileurl = CFURLCreateWithFileSystemPath(NULL, CFSTR("/tmp/recording.caf"), kCFURLPOSIXPathStyle, false); 58 59 CAAudioUnitOutputCapturer captor(someAU, fileurl, 'caff', anASBD); 60 61 { 62 captor.Start(); 63 ... 64 captor.Stop(); 65 } // can repeat 66 67 captor.Close(); // can be omitted; happens automatically from destructor 68 */ 69 70 class CAAudioUnitOutputCapturer { 71 public: 72 enum { noErr = 0 }; 73 74 CAAudioUnitOutputCapturer(AudioUnit au, CFURLRef outputFileURL, AudioFileTypeID fileType, const AudioStreamBasicDescription &format, UInt32 busNumber = 0) : mFileOpen(false)75 mFileOpen(false), 76 mClientFormatSet(false), 77 mAudioUnit(au), 78 mExtAudioFile(NULL), 79 mBusNumber (busNumber) 80 { 81 CFShow(outputFileURL); 82 OSStatus err = ExtAudioFileCreateWithURL(outputFileURL, fileType, &format, NULL, kAudioFileFlags_EraseFile, &mExtAudioFile); 83 if (!err) 84 mFileOpen = true; 85 } 86 Start()87 void Start() { 88 if (mFileOpen) { 89 if (!mClientFormatSet) { 90 AudioStreamBasicDescription clientFormat; 91 UInt32 size = sizeof(clientFormat); 92 AudioUnitGetProperty(mAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, mBusNumber, &clientFormat, &size); 93 ExtAudioFileSetProperty(mExtAudioFile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat); 94 mClientFormatSet = true; 95 } 96 ExtAudioFileWriteAsync(mExtAudioFile, 0, NULL); // initialize async writes 97 AudioUnitAddRenderNotify(mAudioUnit, RenderCallback, this); 98 } 99 } 100 Stop()101 void Stop() { 102 if (mFileOpen) 103 AudioUnitRemoveRenderNotify(mAudioUnit, RenderCallback, this); 104 } 105 Close()106 void Close() { 107 if (mExtAudioFile) { 108 ExtAudioFileDispose(mExtAudioFile); 109 mExtAudioFile = NULL; 110 } 111 } 112 ~CAAudioUnitOutputCapturer()113 ~CAAudioUnitOutputCapturer() { 114 Close(); 115 } 116 117 private: RenderCallback(void * inRefCon,AudioUnitRenderActionFlags * ioActionFlags,const AudioTimeStamp * inTimeStamp,UInt32 inBusNumber,UInt32 inNumberFrames,AudioBufferList * ioData)118 static OSStatus RenderCallback( void * inRefCon, 119 AudioUnitRenderActionFlags * ioActionFlags, 120 const AudioTimeStamp * inTimeStamp, 121 UInt32 inBusNumber, 122 UInt32 inNumberFrames, 123 AudioBufferList * ioData) 124 { 125 if (*ioActionFlags & kAudioUnitRenderAction_PostRender) { 126 CAAudioUnitOutputCapturer *This = (CAAudioUnitOutputCapturer *)inRefCon; 127 static int TEMP_kAudioUnitRenderAction_PostRenderError = (1 << 8); 128 if (This->mBusNumber == inBusNumber && !(*ioActionFlags & TEMP_kAudioUnitRenderAction_PostRenderError)) { 129 OSStatus result = ExtAudioFileWriteAsync(This->mExtAudioFile, inNumberFrames, ioData); 130 if (result) DebugMessageN1("ERROR WRITING FRAMES: %d\n", (int)result); 131 } 132 } 133 return noErr; 134 } 135 136 bool mFileOpen; 137 bool mClientFormatSet; 138 AudioUnit mAudioUnit; 139 ExtAudioFileRef mExtAudioFile; 140 UInt32 mBusNumber; 141 }; 142 143 #endif // __CAAudioUnitOutputCapturer_h__ 144