117 lines
3.1 KiB
Objective-C
117 lines
3.1 KiB
Objective-C
//
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// Converter.m
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// Cog
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//
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// Created by Zaphod Beeblebrox on 8/2/05.
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// Copyright 2005 __MyCompanyName__. All rights reserved.
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//
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#import "Converter.h"
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@implementation Converter
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//called from the complexfill when the audio is converted...good clean fun
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static OSStatus ACInputProc(AudioConverterRef inAudioConverter, UInt32* ioNumberDataPackets, AudioBufferList* ioData, AudioStreamPacketDescription** outDataPacketDescription, void* inUserData)
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{
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SoundController *soundController = (SoundController *)inUserData;
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OSStatus err = noErr;
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int amountToWrite;
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int amountWritten;
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amountToWrite = (*ioNumberDataPackets)*[[soundController input] format].mBytesPerPacket;
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availInput = [[[soundController input] buffer] amountAvailableToReadReturningBuffer:&readPtr];
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while (availInput == 0)
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{
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[conversionSemaphore wait];
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availInput = [[[soundController input] buffer] amountAvailableToReadReturningBuffer:&readPtr];
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}
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if (availInput > amountToWrite)
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availInput = amountToWrite;
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*ioNumberDataPackets = availInput/format->mBytesPerPacket;
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ioData->mBuffers[0].mData = readPtr;
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ioData->mBuffers[0].mDataByteSize = availInput;
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ioData->mBuffers[0].mNumberChannels = [[soundController input] format].mChannelsPerFrame;
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ioData->mNumberBuffers = 1;
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return err;
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}
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-(void)process
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{
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void *writePtr;
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int availOutput;
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int amountConverted;
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while ([soundController shouldContinue] == YES)
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{
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[[soundController outputLock] lock];
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availOutput = [[[soundController output] buffer] amountAvailableToWriteReturningBuffer:&writePtr];
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while (availOutput == 0)
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{
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[[soundController outputLock] unlock];
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[conversionSemaphore wait];
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[[soundController outputLock] lock];
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availOutput = [[[soundController output] buffer] amountAvailableToWriteReturningBuffer:&writePtr];
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}
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amountConverted = [self convert:writePtr amount:availOutput];
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[[[soundController output] buffer] didWriteAmount:amountConverted];
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[[soundController outputLock] unlock];
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}
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}
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- (int)convert:(void *)dest amount:(int)amount
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{
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AudioBufferList ioData;
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UInt32 ioNumberFrames;
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OSStatus err;
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ioNumberFrames = amount/[[soundController output] format].mBytesPerFrame;
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ioData.mBuffers[0].mData = dest;
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ioData.mBuffers[0].mDataByteSize = amount;
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ioData.mBuffers[0].mNumberChannels = [[soundController output] format].mChannelsPerFrame;
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ioData.mNumberBuffers = 1;
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[[soundController inputLock] lock];
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err = AudioConverterFillComplexBuffer(converter, ACInputProc, &[[soundController input] format], &ioNumberFrames, &ioData, NULL);
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if (err != noErr)
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DBLog(@"Converter error: %i", err);
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[[soundController input] buffer] didReadLength:(ioNumberFrames * [[[soundController input] format].mBytesPerFrame]);
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[[soundController inputLock] unlock];
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[[soundController ioSemaphore] signal];
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return ioData.mBuffers[0].mDataByteSize;
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}
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- (void)setup
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{
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//Make the converter
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OSStatus stat = noErr;
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stat = AudioConverterNew ( &sourceStreamFormat, &deviceFormat, &converter);
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// DBLog(@"Created converter");
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if (stat != noErr)
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{
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DBLog(@"Error creating converter %i", stat);
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}
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}
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- (void)cleanUp
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{
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AudioConverterDispose(converter);
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}
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@end
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