1 /*****************************************************************************
2 * audio_output.c : audio output thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: audio_output.c,v 1.56 2001/03/21 13:42:34 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() */
43 #include <stdio.h> /* "intf_msg.h" */
44 #include <stdlib.h> /* calloc(), malloc(), free() */
49 #include "mtime.h" /* mtime_t, mdate(), msleep() */
52 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
54 #include "audio_output.h"
55 #include "aout_common.h"
59 /*****************************************************************************
61 *****************************************************************************/
62 static int aout_SpawnThread( aout_thread_t * p_aout );
64 /*****************************************************************************
65 * aout_CreateThread: initialize audio thread
66 *****************************************************************************/
67 aout_thread_t *aout_CreateThread( int *pi_status )
69 aout_thread_t * p_aout; /* thread descriptor */
71 int i_status; /* thread status */
74 /* Allocate descriptor */
75 p_aout = (aout_thread_t *) malloc( sizeof(aout_thread_t) );
81 /* Choose the best module */
82 p_aout->p_module = module_Need( p_main->p_bank,
83 MODULE_CAPABILITY_AOUT, NULL );
85 if( p_aout->p_module == NULL )
87 intf_ErrMsg( "aout error: no suitable aout module" );
92 #define aout_functions p_aout->p_module->p_functions->aout.functions.aout
93 p_aout->pf_open = aout_functions.pf_open;
94 p_aout->pf_setformat = aout_functions.pf_setformat;
95 p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
96 p_aout->pf_play = aout_functions.pf_play;
97 p_aout->pf_close = aout_functions.pf_close;
101 * Initialize audio device
103 if ( p_aout->pf_open( p_aout ) )
105 module_Unneed( p_main->p_bank, p_aout->p_module );
110 if( p_aout->l_rate == 0 )
112 intf_ErrMsg( "aout error: null sample rate" );
113 p_aout->pf_close( p_aout );
114 module_Unneed( p_main->p_bank, p_aout->p_module );
119 p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0; /* FIXME: only works
120 for i_channels == 1 or 2 ??*/
122 if ( p_aout->pf_setformat( p_aout ) )
124 p_aout->pf_close( p_aout );
125 module_Unneed( p_main->p_bank, p_aout->p_module );
130 /* Initialize the volume level */
131 p_aout->vol = VOLUME_DEFAULT;
133 /* FIXME: maybe it would be cleaner to change SpawnThread prototype
134 * see vout to handle status correctly ?? however, it is not critical since
135 * this thread is only called in main and all calls are blocking */
136 if( aout_SpawnThread( p_aout ) )
138 p_aout->pf_close( p_aout );
139 module_Unneed( p_main->p_bank, p_aout->p_module );
147 /*****************************************************************************
149 *****************************************************************************/
150 static int aout_SpawnThread( aout_thread_t * p_aout )
154 void * aout_thread = NULL;
156 /* We want the audio output thread to live */
158 p_aout->b_active = 1;
160 /* Initialize the fifos lock */
161 vlc_mutex_init( &p_aout->fifos_lock );
162 /* Initialize audio fifos : set all fifos as empty and initialize locks */
163 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
165 p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
166 vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
167 vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
170 /* Compute the size (in audio units) of the audio output buffer. Although
171 * AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
172 * in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
173 p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
174 p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
176 /* Make aout_thread point to the right thread function, and compute the
177 * byte size of the audio output buffer */
178 switch ( p_aout->i_channels )
180 /* Audio output is mono */
182 switch ( p_aout->i_format )
185 intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
186 l_bytes = 1 * sizeof(u8) * p_aout->l_units;
187 aout_thread = (void *)aout_U8MonoThread;
191 intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
192 l_bytes = 1 * sizeof(s8) * p_aout->l_units;
193 aout_thread = (void *)aout_S8MonoThread;
196 case AOUT_FMT_U16_LE:
197 case AOUT_FMT_U16_BE:
198 intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
199 l_bytes = 1 * sizeof(u16) * p_aout->l_units;
200 aout_thread = (void *)aout_U16MonoThread;
203 case AOUT_FMT_S16_LE:
204 case AOUT_FMT_S16_BE:
205 intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
206 l_bytes = 1 * sizeof(s16) * p_aout->l_units;
207 aout_thread = (void *)aout_S16MonoThread;
211 intf_ErrMsg( "aout error: unknown audio output format (%i)",
217 /* Audio output is stereo */
219 switch ( p_aout->i_format )
222 intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
223 l_bytes = 2 * sizeof(u8) * p_aout->l_units;
224 aout_thread = (void *)aout_U8StereoThread;
228 intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
229 l_bytes = 2 * sizeof(s8) * p_aout->l_units;
230 aout_thread = (void *)aout_S8StereoThread;
233 case AOUT_FMT_U16_LE:
234 case AOUT_FMT_U16_BE:
235 intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
236 l_bytes = 2 * sizeof(u16) * p_aout->l_units;
237 aout_thread = (void *)aout_U16StereoThread;
240 case AOUT_FMT_S16_LE:
241 case AOUT_FMT_S16_BE:
242 intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
243 l_bytes = 2 * sizeof(s16) * p_aout->l_units;
244 aout_thread = (void *)aout_S16StereoThread;
248 intf_ErrMsg( "aout error: unknown audio output format %i",
255 intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
256 p_aout->i_channels );
260 /* Allocate the memory needed by the audio output buffers, and set to zero
261 * the s32 buffer's memory */
262 p_aout->buffer = malloc( l_bytes );
263 if ( p_aout->buffer == NULL )
265 intf_ErrMsg( "aout error: cannot create output buffer" );
269 p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
270 sizeof(s32) << ( p_aout->b_stereo ) );
271 if ( p_aout->s32_buffer == NULL )
273 intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
274 free( p_aout->buffer );
278 /* Rough estimate of the playing date */
279 p_aout->date = mdate();
281 /* Launch the thread */
282 if ( vlc_thread_create( &p_aout->thread_id, "audio output",
283 (vlc_thread_func_t)aout_thread, p_aout ) )
285 intf_ErrMsg( "aout error: cannot spawn audio output thread" );
286 free( p_aout->buffer );
287 free( p_aout->s32_buffer );
291 intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
295 /*****************************************************************************
297 *****************************************************************************/
298 void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
303 /* FIXME: pi_status is not handled correctly: check vout how to do!?? */
305 /* Ask thread to kill itself and wait until it's done */
307 vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
309 /* Free the allocated memory */
310 free( p_aout->buffer );
311 free( p_aout->s32_buffer );
313 /* Destroy the condition and mutex locks */
314 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
316 vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
317 vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
319 vlc_mutex_destroy( &p_aout->fifos_lock );
321 /* Free the plugin */
322 p_aout->pf_close( p_aout );
324 /* Release the aout module */
325 module_Unneed( p_main->p_bank, p_aout->p_module );