1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/drivers/audio_osx.c	Sun Jun 22 04:01:27 2008 +0000
     1.3 @@ -0,0 +1,142 @@
     1.4 +/**
     1.5 + * $Id$
     1.6 + * 
     1.7 + * The darwin core-audio audio driver
     1.8 + *
     1.9 + * Copyright (c) 2008 Nathan Keynes.
    1.10 + *
    1.11 + * This program is free software; you can redistribute it and/or modify
    1.12 + * it under the terms of the GNU General Public License as published by
    1.13 + * the Free Software Foundation; either version 2 of the License, or
    1.14 + * (at your option) any later version.
    1.15 + *
    1.16 + * This program is distributed in the hope that it will be useful,
    1.17 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.18 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.19 + * GNU General Public License for more details.
    1.20 + */
    1.21 +#include <stdio.h>
    1.22 +#include <unistd.h>
    1.23 +#include <AudioToolbox/AudioToolbox.h>
    1.24 +#include <AudioUnit/AudioUnitProperties.h>
    1.25 +#include "aica/audio.h"
    1.26 +#include "lxdream.h"
    1.27 +
    1.28 +static AudioUnit output_au;
    1.29 +static volatile audio_buffer_t output_buffer = NULL;
    1.30 +static int sample_size;
    1.31 +
    1.32 +OSStatus audio_osx_callback( void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags,
    1.33 +                             const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber,
    1.34 +                             UInt32 inNumberFrames, AudioBufferList *ioData )
    1.35 +{
    1.36 +    char *output = ioData->mBuffers[0].mData;
    1.37 +    int data_requested = inNumberFrames * sample_size;
    1.38 +
    1.39 +    while( output_buffer != NULL && data_requested > 0 ) {
    1.40 +        int copysize = output_buffer->length - output_buffer->posn;
    1.41 +        if( copysize > data_requested ) {
    1.42 +            copysize = data_requested;
    1.43 +        }
    1.44 +        memcpy( output, &output_buffer->data[output_buffer->posn], copysize );
    1.45 +        output += copysize;
    1.46 +        data_requested -= copysize;
    1.47 +        output_buffer->posn += copysize;
    1.48 +        if( output_buffer->posn >= output_buffer->length ) {
    1.49 +            output_buffer = audio_next_read_buffer();
    1.50 +        }
    1.51 +    }
    1.52 +    if( data_requested > 0 ) {
    1.53 +        memset( output, 0, data_requested );
    1.54 +    }
    1.55 +    return noErr;
    1.56 +}
    1.57 +
    1.58 +static gboolean audio_osx_shutdown()
    1.59 +{
    1.60 +    AudioUnitUninitialize( output_au );
    1.61 +    CloseComponent( output_au );
    1.62 +    return TRUE;
    1.63 +}
    1.64 +
    1.65 +static gboolean audio_osx_init()
    1.66 +{
    1.67 +    AURenderCallbackStruct callbackData;
    1.68 +    AudioStreamBasicDescription outputDesc;
    1.69 +    UInt32 outputDescSize = sizeof(outputDesc);
    1.70 +    ComponentDescription cd;
    1.71 +    Component c;
    1.72 +
    1.73 +    cd.componentType = kAudioUnitType_Output;
    1.74 +    cd.componentSubType = kAudioUnitSubType_DefaultOutput;
    1.75 +    cd.componentManufacturer = kAudioUnitManufacturer_Apple;
    1.76 +    cd.componentFlags = 0;
    1.77 +    cd.componentFlagsMask = 0;
    1.78 +
    1.79 +    c = FindNextComponent( NULL, &cd );
    1.80 +    if( c == NULL ) {
    1.81 +        return FALSE;
    1.82 +    }
    1.83 +    
    1.84 +    if( OpenAComponent( c, &output_au ) != noErr ) {
    1.85 +        return FALSE;
    1.86 +    }
    1.87 + 
    1.88 +    if( AudioUnitGetProperty( output_au, kAudioUnitProperty_StreamFormat,
    1.89 +            kAudioUnitScope_Global, 0, &outputDesc, &outputDescSize ) != noErr ) {
    1.90 +        CloseComponent( output_au );
    1.91 +        return FALSE;
    1.92 +    }
    1.93 +    
    1.94 +    outputDesc.mSampleRate = DEFAULT_SAMPLE_RATE;
    1.95 +    sample_size = outputDesc.mBytesPerFrame;
    1.96 +    
    1.97 +    if( AudioUnitSetProperty( output_au, kAudioUnitProperty_StreamFormat,
    1.98 +            kAudioUnitScope_Global, 0, &outputDesc, sizeof(outputDesc) ) != noErr ) {
    1.99 +        CloseComponent( output_au );
   1.100 +        return FALSE;
   1.101 +    }
   1.102 +    
   1.103 +    if( AudioUnitInitialize( output_au ) != noErr ) {
   1.104 +        CloseComponent( output_au );
   1.105 +        return FALSE;
   1.106 +    }
   1.107 +
   1.108 +    callbackData.inputProc = audio_osx_callback;
   1.109 +    callbackData.inputProcRefCon = NULL;
   1.110 +    if( AudioUnitSetProperty( output_au, kAudioUnitProperty_SetRenderCallback,
   1.111 +            kAudioUnitScope_Global, 0, &callbackData, sizeof(callbackData)) != noErr ) {
   1.112 +        audio_osx_shutdown();
   1.113 +        return FALSE;
   1.114 +    }
   1.115 +    
   1.116 +    return TRUE;
   1.117 +}
   1.118 +static gboolean audio_osx_process_buffer( audio_buffer_t buffer )
   1.119 +{
   1.120 +    if( output_buffer == NULL ) {
   1.121 +        output_buffer = buffer;
   1.122 +        output_buffer->posn = 0;
   1.123 +        AudioOutputUnitStart(output_au);
   1.124 +        return FALSE;
   1.125 +    }
   1.126 +}
   1.127 +
   1.128 +void audio_osx_start()
   1.129 +{
   1.130 +}
   1.131 +
   1.132 +void audio_osx_stop()
   1.133 +{
   1.134 +}
   1.135 +
   1.136 +
   1.137 +struct audio_driver audio_osx_driver = { "osx", 
   1.138 +        DEFAULT_SAMPLE_RATE,
   1.139 +        AUDIO_FMT_FLOATST,
   1.140 +        audio_osx_init,
   1.141 +        audio_osx_start, 
   1.142 +        audio_osx_process_buffer,
   1.143 +        audio_osx_stop,
   1.144 +        audio_osx_shutdown};
   1.145 +