lxdream 0.9.1| filename | src/drivers/audio_osx.c |
| changeset | 697:479b8c213f61 |
| next | 700:4650d0c7f6f9 |
| author | nkeynes |
| date | Sun Jun 22 04:01:27 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Commit work-in-progress CoreAudio driver (along with various changes to the audio subsystem) |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * The darwin core-audio audio driver
5 *
6 * Copyright (c) 2008 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18 #include <stdio.h>
19 #include <unistd.h>
20 #include <AudioToolbox/AudioToolbox.h>
21 #include <AudioUnit/AudioUnitProperties.h>
22 #include "aica/audio.h"
23 #include "lxdream.h"
25 static AudioUnit output_au;
26 static volatile audio_buffer_t output_buffer = NULL;
27 static int sample_size;
29 OSStatus audio_osx_callback( void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags,
30 const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber,
31 UInt32 inNumberFrames, AudioBufferList *ioData )
32 {
33 char *output = ioData->mBuffers[0].mData;
34 int data_requested = inNumberFrames * sample_size;
36 while( output_buffer != NULL && data_requested > 0 ) {
37 int copysize = output_buffer->length - output_buffer->posn;
38 if( copysize > data_requested ) {
39 copysize = data_requested;
40 }
41 memcpy( output, &output_buffer->data[output_buffer->posn], copysize );
42 output += copysize;
43 data_requested -= copysize;
44 output_buffer->posn += copysize;
45 if( output_buffer->posn >= output_buffer->length ) {
46 output_buffer = audio_next_read_buffer();
47 }
48 }
49 if( data_requested > 0 ) {
50 memset( output, 0, data_requested );
51 }
52 return noErr;
53 }
55 static gboolean audio_osx_shutdown()
56 {
57 AudioUnitUninitialize( output_au );
58 CloseComponent( output_au );
59 return TRUE;
60 }
62 static gboolean audio_osx_init()
63 {
64 AURenderCallbackStruct callbackData;
65 AudioStreamBasicDescription outputDesc;
66 UInt32 outputDescSize = sizeof(outputDesc);
67 ComponentDescription cd;
68 Component c;
70 cd.componentType = kAudioUnitType_Output;
71 cd.componentSubType = kAudioUnitSubType_DefaultOutput;
72 cd.componentManufacturer = kAudioUnitManufacturer_Apple;
73 cd.componentFlags = 0;
74 cd.componentFlagsMask = 0;
76 c = FindNextComponent( NULL, &cd );
77 if( c == NULL ) {
78 return FALSE;
79 }
81 if( OpenAComponent( c, &output_au ) != noErr ) {
82 return FALSE;
83 }
85 if( AudioUnitGetProperty( output_au, kAudioUnitProperty_StreamFormat,
86 kAudioUnitScope_Global, 0, &outputDesc, &outputDescSize ) != noErr ) {
87 CloseComponent( output_au );
88 return FALSE;
89 }
91 outputDesc.mSampleRate = DEFAULT_SAMPLE_RATE;
92 sample_size = outputDesc.mBytesPerFrame;
94 if( AudioUnitSetProperty( output_au, kAudioUnitProperty_StreamFormat,
95 kAudioUnitScope_Global, 0, &outputDesc, sizeof(outputDesc) ) != noErr ) {
96 CloseComponent( output_au );
97 return FALSE;
98 }
100 if( AudioUnitInitialize( output_au ) != noErr ) {
101 CloseComponent( output_au );
102 return FALSE;
103 }
105 callbackData.inputProc = audio_osx_callback;
106 callbackData.inputProcRefCon = NULL;
107 if( AudioUnitSetProperty( output_au, kAudioUnitProperty_SetRenderCallback,
108 kAudioUnitScope_Global, 0, &callbackData, sizeof(callbackData)) != noErr ) {
109 audio_osx_shutdown();
110 return FALSE;
111 }
113 return TRUE;
114 }
115 static gboolean audio_osx_process_buffer( audio_buffer_t buffer )
116 {
117 if( output_buffer == NULL ) {
118 output_buffer = buffer;
119 output_buffer->posn = 0;
120 AudioOutputUnitStart(output_au);
121 return FALSE;
122 }
123 }
125 void audio_osx_start()
126 {
127 }
129 void audio_osx_stop()
130 {
131 }
134 struct audio_driver audio_osx_driver = { "osx",
135 DEFAULT_SAMPLE_RATE,
136 AUDIO_FMT_FLOATST,
137 audio_osx_init,
138 audio_osx_start,
139 audio_osx_process_buffer,
140 audio_osx_stop,
141 audio_osx_shutdown};
.