1 /*****************************************************************************
2 * aout.m: CoreAudio output plugin
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: aout.m,v 1.9 2002/09/02 23:17:05 massiot Exp $
7 * Authors: Colin Delacroix <colin@zoy.org>
8 * Jon Lech Johansen <jon-vl@nanocrew.net>
9 * Christophe Massiot <massiot@via.ecp.fr>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
34 #include "aout_internal.h"
36 #include <Carbon/Carbon.h>
37 #include <CoreAudio/AudioHardware.h>
38 #include <CoreAudio/HostTime.h>
39 #include <AudioToolbox/AudioConverter.h>
41 /*****************************************************************************
42 * aout_sys_t: private audio output method descriptor
43 *****************************************************************************
44 * This structure is part of the audio output thread descriptor.
45 * It describes the CoreAudio specific properties of an output thread.
46 *****************************************************************************/
49 AudioDeviceID device; // the audio device
51 AudioStreamBasicDescription stream_format;
53 UInt32 i_buffer_size; // audio device buffer size
57 /*****************************************************************************
59 *****************************************************************************/
60 static void Play ( aout_instance_t *p_aout );
62 static OSStatus IOCallback ( AudioDeviceID inDevice,
63 const AudioTimeStamp *inNow,
64 const void *inInputData,
65 const AudioTimeStamp *inInputTime,
66 AudioBufferList *outOutputData,
67 const AudioTimeStamp *inOutputTime,
68 void *threadGlobals );
70 /*****************************************************************************
71 * Open: open a CoreAudio HAL device
72 *****************************************************************************/
73 int E_(OpenAudio)( vlc_object_t * p_this )
77 aout_instance_t * p_aout = (aout_instance_t *)p_this;
78 struct aout_sys_t * p_sys;
80 /* Allocate instance */
81 p_sys = p_aout->output.p_sys = malloc( sizeof( struct aout_sys_t ) );
82 memset( p_sys, 0, sizeof( struct aout_sys_t ) );
83 if( p_aout->output.p_sys == NULL )
85 msg_Err( p_aout, "out of memory" );
89 /* Get the default output device */
90 /* FIXME : be more clever in choosing from several devices */
91 i_param_size = sizeof( p_sys->device );
92 err = AudioHardwareGetProperty( kAudioHardwarePropertyDefaultOutputDevice,
94 (void *)&p_sys->device );
97 msg_Err( p_aout, "failed to get the device: %d", err );
101 p_aout->output.pf_play = Play;
103 /* Get a description of the data format used by the device */
104 i_param_size = sizeof( p_sys->stream_format );
105 err = AudioDeviceGetProperty( p_sys->device, 0, false,
106 kAudioDevicePropertyStreamFormat,
108 &p_sys->stream_format );
111 msg_Err( p_aout, "failed to get stream format: %d", err );
115 if( p_sys->stream_format.mFormatID != kAudioFormatLinearPCM )
117 msg_Err( p_aout, "kAudioFormatLinearPCM required" );
121 /* We only deal with floats. FIXME : this is where we should do S/PDIF. */
122 p_aout->output.output.i_format = AOUT_FMT_FLOAT32;
124 /* Set sample rate and channels per frame */
125 p_aout->output.output.i_rate = p_sys->stream_format.mSampleRate;
126 /* FIXME : this is where we should ask for downmixing. */
127 p_aout->output.output.i_channels = 2; //p_sys->stream_format.mChannelsPerFrame;
129 /* Get the buffer size that the device uses for IO */
130 i_param_size = sizeof( p_sys->i_buffer_size );
132 err = AudioDeviceGetProperty( p_sys->device, 0, false,
133 kAudioDevicePropertyBufferSize,
134 &i_param_size, &p_sys->i_buffer_size );
135 msg_Dbg( p_aout, "toto : %d", p_sys->i_buffer_size );
137 p_sys->i_buffer_size = sizeof(float) * p_aout->output.output.i_channels
139 err = AudioDeviceSetProperty( p_sys->device, 0, 0, false,
140 kAudioDevicePropertyBufferSize,
141 i_param_size, &p_sys->i_buffer_size );
145 msg_Err( p_aout, "failed to set device buffer size: %d", err );
149 p_aout->output.i_nb_samples = p_sys->i_buffer_size / sizeof(float)
150 / p_aout->output.output.i_channels;
153 err = AudioDeviceAddIOProc( p_sys->device,
154 (AudioDeviceIOProc)IOCallback,
157 /* Open the output with callback IOCallback */
158 err = AudioDeviceStart( p_sys->device,
159 (AudioDeviceIOProc)IOCallback );
162 msg_Err( p_aout, "AudioDeviceStart failed: %d", err );
166 /* Let's pray for the following operation to be atomic... */
167 p_sys->clock_diff = - (mtime_t)AudioConvertHostTimeToNanos(
168 AudioGetCurrentHostTime()) / 1000;
169 p_sys->clock_diff += mdate();
174 /*****************************************************************************
175 * Close: close the CoreAudio HAL device
176 *****************************************************************************/
177 void E_(CloseAudio)( aout_instance_t * p_aout )
179 struct aout_sys_t * p_sys = p_aout->output.p_sys;
182 /* Stop playing sound through the device */
183 err = AudioDeviceStop( p_sys->device,
184 (AudioDeviceIOProc)IOCallback );
187 msg_Err( p_aout, "AudioDeviceStop failed: %d", err );
193 /*****************************************************************************
194 * Play: nothing to do
195 *****************************************************************************/
196 static void Play( aout_instance_t * p_aout )
200 /*****************************************************************************
201 * IOCallback : callback for audio output
202 *****************************************************************************/
203 static OSStatus IOCallback( AudioDeviceID inDevice,
204 const AudioTimeStamp *inNow,
205 const void *inInputData,
206 const AudioTimeStamp *inInputTime,
207 AudioBufferList *outOutputData,
208 const AudioTimeStamp *inOutputTime,
209 void *threadGlobals )
211 aout_instance_t * p_aout = (aout_instance_t *)threadGlobals;
212 struct aout_sys_t * p_sys = p_aout->output.p_sys;
213 mtime_t current_date;
214 AudioTimeStamp host_time;
215 aout_buffer_t * p_buffer;
217 host_time.mFlags = kAudioTimeStampHostTimeValid;
218 AudioDeviceTranslateTime( inDevice, inOutputTime, &host_time );
219 current_date = p_sys->clock_diff
220 + AudioConvertHostTimeToNanos(host_time.mHostTime) / 1000;
222 p_buffer = aout_OutputNextBuffer( p_aout, current_date, VLC_FALSE );
224 /* move data into output data buffer */
225 if ( p_buffer != NULL )
227 BlockMoveData( p_buffer->p_buffer,
228 outOutputData->mBuffers[ 0 ].mData,
229 p_sys->i_buffer_size );
230 aout_BufferFree( p_buffer );
234 memset(outOutputData->mBuffers[ 0 ].mData, 0, p_sys->i_buffer_size);