1 /*****************************************************************************
2 * audio_output.c : audio output thread
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: audio_output.c,v 1.77 2002/02/24 20:51:10 gbazin Exp $
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * Cyril Deguet <asmax@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
28 #include <stdio.h> /* "intf_msg.h" */
29 #include <stdlib.h> /* calloc(), malloc(), free() */
32 #include <videolan/vlc.h>
35 # include <unistd.h> /* getpid() */
38 #ifdef WIN32 /* getpid() for win32 is located in process.h */
42 #include "audio_output.h"
43 #include "aout_common.h"
45 /*****************************************************************************
47 *****************************************************************************/
48 static int aout_SpawnThread( aout_thread_t * p_aout );
50 /*****************************************************************************
51 * aout_InitBank: initialize the audio output bank.
52 *****************************************************************************/
53 void aout_InitBank ( void )
55 p_aout_bank->i_count = 0;
57 vlc_mutex_init( &p_aout_bank->lock );
60 /*****************************************************************************
61 * aout_EndBank: empty the audio output bank.
62 *****************************************************************************
63 * This function ends all unused audio outputs and empties the bank in
65 *****************************************************************************/
66 void aout_EndBank ( void )
68 /* Ask all remaining audio outputs to die */
69 while( p_aout_bank->i_count )
72 p_aout_bank->pp_aout[ --p_aout_bank->i_count ], NULL );
75 vlc_mutex_destroy( &p_aout_bank->lock );
78 /*****************************************************************************
79 * aout_CreateThread: initialize audio thread
80 *****************************************************************************/
81 aout_thread_t *aout_CreateThread( int *pi_status, int i_channels, long l_rate )
83 aout_thread_t * p_aout; /* thread descriptor */
85 int i_status; /* thread status */
88 /* Allocate descriptor */
89 p_aout = (aout_thread_t *) malloc( sizeof(aout_thread_t) );
95 p_aout->i_latency = 0;
96 p_aout->l_rate = config_GetIntVariable( AOUT_RATE_VAR );
97 p_aout->i_channels = config_GetIntVariable( AOUT_MONO_VAR ) ? 1 : 2;
99 intf_WarnMsg( 3, "aout info: thread created, channels %d, rate %d",
100 p_aout->i_channels, p_aout->l_rate );
102 /* Maybe we should pass this setting in argument */
103 p_aout->i_format = AOUT_FORMAT_DEFAULT;
105 /* special setting for ac3 pass-through mode */
106 /* FIXME is it necessary ? (cf ac3_adec.c) */
107 if( config_GetIntVariable( AOUT_SPDIF_VAR ) && p_main->b_ac3 )
109 intf_WarnMsg( 4, "aout info: setting ac3 spdif" );
110 p_aout->i_format = AOUT_FMT_AC3;
113 if( p_aout->l_rate == 0 )
115 intf_ErrMsg( "aout error: null sample rate" );
120 /* FIXME: only works for i_channels == 1 or 2 ?? */
121 p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0;
123 /* Choose the best module */
124 p_aout->p_module = module_Need( MODULE_CAPABILITY_AOUT,
125 config_GetPszVariable( AOUT_METHOD_VAR ),
128 if( p_aout->p_module == NULL )
130 intf_ErrMsg( "aout error: no suitable aout module" );
135 #define aout_functions p_aout->p_module->p_functions->aout.functions.aout
136 p_aout->pf_open = aout_functions.pf_open;
137 p_aout->pf_setformat = aout_functions.pf_setformat;
138 p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
139 p_aout->pf_play = aout_functions.pf_play;
140 p_aout->pf_close = aout_functions.pf_close;
141 #undef aout_functions
144 * Initialize audio device
146 if ( p_aout->pf_setformat( p_aout ) )
148 p_aout->pf_close( p_aout );
149 module_Unneed( p_aout->p_module );
154 /* Initialize the volume level */
155 p_aout->i_volume = config_GetIntVariable( AOUT_VOLUME_VAR );
156 p_aout->i_savedvolume = 0;
158 /* FIXME: maybe it would be cleaner to change SpawnThread prototype
159 * see vout to handle status correctly ?? however, it is not critical since
160 * this thread is only called in main and all calls are blocking */
161 if( aout_SpawnThread( p_aout ) )
163 p_aout->pf_close( p_aout );
164 module_Unneed( p_aout->p_module );
173 /*****************************************************************************
174 * Declare the different aout thread functions
175 *****************************************************************************/
176 DECLARE_AOUT_THREAD( S16, s16, ( p_aout->s32_buffer[l_buffer] /
179 DECLARE_AOUT_THREAD( U16, u16, (( p_aout->s32_buffer[l_buffer] /
180 AOUT_MAX_FIFOS) + 128) )
182 DECLARE_AOUT_THREAD( U8, u8, (( p_aout->s32_buffer[l_buffer] /
183 AOUT_MAX_FIFOS / 256) + 128 ) )
185 DECLARE_AOUT_THREAD( S8, s8, ( p_aout->s32_buffer[l_buffer] /
186 AOUT_MAX_FIFOS / 256) )
189 /*****************************************************************************
191 *****************************************************************************/
192 static int aout_SpawnThread( aout_thread_t * p_aout )
196 void (* pf_aout_thread)( aout_thread_t * ) = NULL;
198 /* We want the audio output thread to live */
200 p_aout->b_active = 1;
202 /* Initialize the fifos lock */
203 vlc_mutex_init( &p_aout->fifos_lock );
204 /* Initialize audio fifos : set all fifos as empty and initialize locks */
205 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
207 p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
208 vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
209 vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
212 /* Compute the size (in audio units) of the audio output buffer. Although
213 * AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
214 * in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
215 p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
216 p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
218 /* Make pf_aout_thread point to the right thread function, and compute the
219 * byte size of the audio output buffer */
220 switch ( p_aout->i_channels )
222 /* Audio output is mono */
224 switch ( p_aout->i_format )
227 intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
228 l_bytes = 1 * sizeof(u8) * p_aout->l_units;
229 pf_aout_thread = aout_U8Thread;
233 intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
234 l_bytes = 1 * sizeof(s8) * p_aout->l_units;
235 pf_aout_thread = aout_S8Thread;
238 case AOUT_FMT_U16_LE:
239 case AOUT_FMT_U16_BE:
240 intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
241 l_bytes = 1 * sizeof(u16) * p_aout->l_units;
242 pf_aout_thread = aout_U16Thread;
245 case AOUT_FMT_S16_LE:
246 case AOUT_FMT_S16_BE:
247 intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
248 l_bytes = 1 * sizeof(s16) * p_aout->l_units;
249 pf_aout_thread = aout_S16Thread;
253 intf_ErrMsg( "aout error: unknown audio output format (%i)",
259 /* Audio output is stereo */
261 switch ( p_aout->i_format )
264 intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
265 l_bytes = 2 * sizeof(u8) * p_aout->l_units;
266 pf_aout_thread = aout_U8Thread;
270 intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
271 l_bytes = 2 * sizeof(s8) * p_aout->l_units;
272 pf_aout_thread = aout_S8Thread;
275 case AOUT_FMT_U16_LE:
276 case AOUT_FMT_U16_BE:
277 intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
278 l_bytes = 2 * sizeof(u16) * p_aout->l_units;
279 pf_aout_thread = aout_U16Thread;
282 case AOUT_FMT_S16_LE:
283 case AOUT_FMT_S16_BE:
284 intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
285 l_bytes = 2 * sizeof(s16) * p_aout->l_units;
286 pf_aout_thread = aout_S16Thread;
290 intf_WarnMsg( 2, "aout info: ac3 pass-through thread" );
291 l_bytes = SPDIF_FRAME_SIZE;
292 pf_aout_thread = aout_SpdifThread;
296 intf_ErrMsg( "aout error: unknown audio output format %i",
303 intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
304 p_aout->i_channels );
308 /* Allocate the memory needed by the audio output buffers, and set to zero
309 * the s32 buffer's memory */
310 p_aout->buffer = malloc( l_bytes );
311 if ( p_aout->buffer == NULL )
313 intf_ErrMsg( "aout error: cannot create output buffer" );
317 p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
318 sizeof(s32) << ( p_aout->b_stereo ) );
319 if ( p_aout->s32_buffer == NULL )
321 intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
322 free( p_aout->buffer );
326 /* Rough estimate of the playing date */
327 p_aout->date = mdate() + p_main->i_desync;
329 /* Launch the thread */
330 if ( vlc_thread_create( &p_aout->thread_id, "audio output",
331 (vlc_thread_func_t)pf_aout_thread, p_aout ) )
333 intf_ErrMsg( "aout error: cannot spawn audio output thread" );
334 free( p_aout->buffer );
335 free( p_aout->s32_buffer );
339 intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
343 /*****************************************************************************
345 *****************************************************************************/
346 void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
350 /* FIXME: pi_status is not handled correctly: check vout how to do!?? */
352 /* Ask thread to kill itself and wait until it's done */
354 vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
356 /* Free the allocated memory */
357 free( p_aout->buffer );
358 free( p_aout->s32_buffer );
360 /* Destroy the condition and mutex locks */
361 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
363 vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
364 vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
366 vlc_mutex_destroy( &p_aout->fifos_lock );
368 /* Free the plugin */
369 p_aout->pf_close( p_aout );
371 /* Release the aout module */
372 module_Unneed( p_aout->p_module );