1 /*****************************************************************************
2 * audio_output.c : audio output thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: audio_output.c,v 1.57 2001/04/28 03:36:25 sam Exp $
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
26 * - Passer un certain nombre de "fonctions" (genre add_samples) en macro ou
28 * - Faire les optimisations dans les fonctions threads :
29 * = Stocker les "petits calculs" dans des variables au lieu de les refaire
31 * = Utiliser des tables pour les gros calculs
32 * - Faire une structure différente pour intf/adec fifo
36 /*****************************************************************************
38 *****************************************************************************/
41 #include <unistd.h> /* getpid() */
42 #ifdef WIN32 /* getpid() for win32 is located in process.h */
46 #include <stdio.h> /* "intf_msg.h" */
47 #include <stdlib.h> /* calloc(), malloc(), free() */
52 #include "mtime.h" /* mtime_t, mdate(), msleep() */
55 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
57 #include "audio_output.h"
58 #include "aout_common.h"
62 /*****************************************************************************
64 *****************************************************************************/
65 static int aout_SpawnThread( aout_thread_t * p_aout );
67 /*****************************************************************************
68 * aout_CreateThread: initialize audio thread
69 *****************************************************************************/
70 aout_thread_t *aout_CreateThread( int *pi_status )
72 aout_thread_t * p_aout; /* thread descriptor */
74 int i_status; /* thread status */
77 /* Allocate descriptor */
78 p_aout = (aout_thread_t *) malloc( sizeof(aout_thread_t) );
84 /* Choose the best module */
85 p_aout->p_module = module_Need( p_main->p_bank,
86 MODULE_CAPABILITY_AOUT, NULL );
88 if( p_aout->p_module == NULL )
90 intf_ErrMsg( "aout error: no suitable aout module" );
95 #define aout_functions p_aout->p_module->p_functions->aout.functions.aout
96 p_aout->pf_open = aout_functions.pf_open;
97 p_aout->pf_setformat = aout_functions.pf_setformat;
98 p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
99 p_aout->pf_play = aout_functions.pf_play;
100 p_aout->pf_close = aout_functions.pf_close;
101 #undef aout_functions
104 * Initialize audio device
106 if ( p_aout->pf_open( p_aout ) )
108 module_Unneed( p_main->p_bank, p_aout->p_module );
113 if( p_aout->l_rate == 0 )
115 intf_ErrMsg( "aout error: null sample rate" );
116 p_aout->pf_close( p_aout );
117 module_Unneed( p_main->p_bank, p_aout->p_module );
122 /* FIXME: only works for i_channels == 1 or 2 ?? */
123 p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0;
125 if ( p_aout->pf_setformat( p_aout ) )
127 p_aout->pf_close( p_aout );
128 module_Unneed( p_main->p_bank, p_aout->p_module );
133 /* Initialize the volume level */
134 p_aout->vol = VOLUME_DEFAULT;
136 /* FIXME: maybe it would be cleaner to change SpawnThread prototype
137 * see vout to handle status correctly ?? however, it is not critical since
138 * this thread is only called in main and all calls are blocking */
139 if( aout_SpawnThread( p_aout ) )
141 p_aout->pf_close( p_aout );
142 module_Unneed( p_main->p_bank, p_aout->p_module );
150 /*****************************************************************************
152 *****************************************************************************/
153 static int aout_SpawnThread( aout_thread_t * p_aout )
157 void * aout_thread = NULL;
159 /* We want the audio output thread to live */
161 p_aout->b_active = 1;
163 /* Initialize the fifos lock */
164 vlc_mutex_init( &p_aout->fifos_lock );
165 /* Initialize audio fifos : set all fifos as empty and initialize locks */
166 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
168 p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
169 vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
170 vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
173 /* Compute the size (in audio units) of the audio output buffer. Although
174 * AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
175 * in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
176 p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
177 p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
179 /* Make aout_thread point to the right thread function, and compute the
180 * byte size of the audio output buffer */
181 switch ( p_aout->i_channels )
183 /* Audio output is mono */
185 switch ( p_aout->i_format )
188 intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
189 l_bytes = 1 * sizeof(u8) * p_aout->l_units;
190 aout_thread = (void *)aout_U8MonoThread;
194 intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
195 l_bytes = 1 * sizeof(s8) * p_aout->l_units;
196 aout_thread = (void *)aout_S8MonoThread;
199 case AOUT_FMT_U16_LE:
200 case AOUT_FMT_U16_BE:
201 intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
202 l_bytes = 1 * sizeof(u16) * p_aout->l_units;
203 aout_thread = (void *)aout_U16MonoThread;
206 case AOUT_FMT_S16_LE:
207 case AOUT_FMT_S16_BE:
208 intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
209 l_bytes = 1 * sizeof(s16) * p_aout->l_units;
210 aout_thread = (void *)aout_S16MonoThread;
214 intf_ErrMsg( "aout error: unknown audio output format (%i)",
220 /* Audio output is stereo */
222 switch ( p_aout->i_format )
225 intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
226 l_bytes = 2 * sizeof(u8) * p_aout->l_units;
227 aout_thread = (void *)aout_U8StereoThread;
231 intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
232 l_bytes = 2 * sizeof(s8) * p_aout->l_units;
233 aout_thread = (void *)aout_S8StereoThread;
236 case AOUT_FMT_U16_LE:
237 case AOUT_FMT_U16_BE:
238 intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
239 l_bytes = 2 * sizeof(u16) * p_aout->l_units;
240 aout_thread = (void *)aout_U16StereoThread;
243 case AOUT_FMT_S16_LE:
244 case AOUT_FMT_S16_BE:
245 intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
246 l_bytes = 2 * sizeof(s16) * p_aout->l_units;
247 aout_thread = (void *)aout_S16StereoThread;
251 intf_ErrMsg( "aout error: unknown audio output format %i",
258 intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
259 p_aout->i_channels );
263 /* Allocate the memory needed by the audio output buffers, and set to zero
264 * the s32 buffer's memory */
265 p_aout->buffer = malloc( l_bytes );
266 if ( p_aout->buffer == NULL )
268 intf_ErrMsg( "aout error: cannot create output buffer" );
272 p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
273 sizeof(s32) << ( p_aout->b_stereo ) );
274 if ( p_aout->s32_buffer == NULL )
276 intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
277 free( p_aout->buffer );
281 /* Rough estimate of the playing date */
282 p_aout->date = mdate();
284 /* Launch the thread */
285 if ( vlc_thread_create( &p_aout->thread_id, "audio output",
286 (vlc_thread_func_t)aout_thread, p_aout ) )
288 intf_ErrMsg( "aout error: cannot spawn audio output thread" );
289 free( p_aout->buffer );
290 free( p_aout->s32_buffer );
294 intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
298 /*****************************************************************************
300 *****************************************************************************/
301 void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
306 /* FIXME: pi_status is not handled correctly: check vout how to do!?? */
308 /* Ask thread to kill itself and wait until it's done */
310 vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
312 /* Free the allocated memory */
313 free( p_aout->buffer );
314 free( p_aout->s32_buffer );
316 /* Destroy the condition and mutex locks */
317 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
319 vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
320 vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
322 vlc_mutex_destroy( &p_aout->fifos_lock );
324 /* Free the plugin */
325 p_aout->pf_close( p_aout );
327 /* Release the aout module */
328 module_Unneed( p_main->p_bank, p_aout->p_module );