1 /*****************************************************************************
2 * audio_output.c : audio output thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: audio_output.c,v 1.59 2001/05/01 04:18:18 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( MODULE_CAPABILITY_AOUT, NULL );
87 if( p_aout->p_module == NULL )
89 intf_ErrMsg( "aout error: no suitable aout module" );
94 #define aout_functions p_aout->p_module->p_functions->aout.functions.aout
95 p_aout->pf_open = aout_functions.pf_open;
96 p_aout->pf_setformat = aout_functions.pf_setformat;
97 p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
98 p_aout->pf_play = aout_functions.pf_play;
99 p_aout->pf_close = aout_functions.pf_close;
100 #undef aout_functions
103 * Initialize audio device
105 if ( p_aout->pf_open( p_aout ) )
107 module_Unneed( p_aout->p_module );
112 if( p_aout->l_rate == 0 )
114 intf_ErrMsg( "aout error: null sample rate" );
115 p_aout->pf_close( p_aout );
116 module_Unneed( p_aout->p_module );
121 /* special setting for ac3 pass-through mode */
122 if( main_GetIntVariable( AOUT_SPDIF_VAR, 0 ) )
124 p_aout->i_format = AOUT_FMT_AC3;
125 p_aout->i_channels = 1;
126 p_aout->l_rate = 48000;
129 /* FIXME: only works for i_channels == 1 or 2 ?? */
130 p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0;
132 if ( p_aout->pf_setformat( p_aout ) )
134 p_aout->pf_close( p_aout );
135 module_Unneed( p_aout->p_module );
140 /* Initialize the volume level */
141 p_aout->i_vol = VOLUME_DEFAULT;
143 /* FIXME: maybe it would be cleaner to change SpawnThread prototype
144 * see vout to handle status correctly ?? however, it is not critical since
145 * this thread is only called in main and all calls are blocking */
146 if( aout_SpawnThread( p_aout ) )
148 p_aout->pf_close( p_aout );
149 module_Unneed( p_aout->p_module );
157 /*****************************************************************************
159 *****************************************************************************/
160 static int aout_SpawnThread( aout_thread_t * p_aout )
164 void * aout_thread = NULL;
166 /* We want the audio output thread to live */
168 p_aout->b_active = 1;
170 /* Initialize the fifos lock */
171 vlc_mutex_init( &p_aout->fifos_lock );
172 /* Initialize audio fifos : set all fifos as empty and initialize locks */
173 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
175 p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
176 vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
177 vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
180 /* Compute the size (in audio units) of the audio output buffer. Although
181 * AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
182 * in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
183 p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
184 p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
186 /* Make aout_thread point to the right thread function, and compute the
187 * byte size of the audio output buffer */
188 switch ( p_aout->i_channels )
190 /* Audio output is mono */
192 switch ( p_aout->i_format )
195 intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
196 l_bytes = 1 * sizeof(u8) * p_aout->l_units;
197 aout_thread = (void *)aout_U8MonoThread;
201 intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
202 l_bytes = 1 * sizeof(s8) * p_aout->l_units;
203 aout_thread = (void *)aout_S8MonoThread;
206 case AOUT_FMT_U16_LE:
207 case AOUT_FMT_U16_BE:
208 intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
209 l_bytes = 1 * sizeof(u16) * p_aout->l_units;
210 aout_thread = (void *)aout_U16MonoThread;
213 case AOUT_FMT_S16_LE:
214 case AOUT_FMT_S16_BE:
215 intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
216 l_bytes = 1 * sizeof(s16) * p_aout->l_units;
217 aout_thread = (void *)aout_S16MonoThread;
220 intf_WarnMsg( 2, "aout info: ac3 pass-through thread" );
222 aout_thread = (void *)aout_SpdifThread;
226 intf_ErrMsg( "aout error: unknown audio output format (%i)",
232 /* Audio output is stereo */
234 switch ( p_aout->i_format )
237 intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
238 l_bytes = 2 * sizeof(u8) * p_aout->l_units;
239 aout_thread = (void *)aout_U8StereoThread;
243 intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
244 l_bytes = 2 * sizeof(s8) * p_aout->l_units;
245 aout_thread = (void *)aout_S8StereoThread;
248 case AOUT_FMT_U16_LE:
249 case AOUT_FMT_U16_BE:
250 intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
251 l_bytes = 2 * sizeof(u16) * p_aout->l_units;
252 aout_thread = (void *)aout_U16StereoThread;
255 case AOUT_FMT_S16_LE:
256 case AOUT_FMT_S16_BE:
257 intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
258 l_bytes = 2 * sizeof(s16) * p_aout->l_units;
259 aout_thread = (void *)aout_S16StereoThread;
262 intf_ErrMsg( "aout error: unknown audio output format %i",
269 intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
270 p_aout->i_channels );
274 /* Allocate the memory needed by the audio output buffers, and set to zero
275 * the s32 buffer's memory */
276 p_aout->buffer = malloc( l_bytes );
277 if ( p_aout->buffer == NULL )
279 intf_ErrMsg( "aout error: cannot create output buffer" );
283 p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
284 sizeof(s32) << ( p_aout->b_stereo ) );
285 if ( p_aout->s32_buffer == NULL )
287 intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
288 free( p_aout->buffer );
292 /* Rough estimate of the playing date */
293 p_aout->date = mdate();
295 /* Launch the thread */
296 if ( vlc_thread_create( &p_aout->thread_id, "audio output",
297 (vlc_thread_func_t)aout_thread, p_aout ) )
299 intf_ErrMsg( "aout error: cannot spawn audio output thread" );
300 free( p_aout->buffer );
301 free( p_aout->s32_buffer );
305 intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
309 /*****************************************************************************
311 *****************************************************************************/
312 void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
317 /* FIXME: pi_status is not handled correctly: check vout how to do!?? */
319 /* Ask thread to kill itself and wait until it's done */
321 vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
323 /* Free the allocated memory */
324 free( p_aout->buffer );
325 free( p_aout->s32_buffer );
327 /* Destroy the condition and mutex locks */
328 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
330 vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
331 vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
333 vlc_mutex_destroy( &p_aout->fifos_lock );
335 /* Free the plugin */
336 p_aout->pf_close( p_aout );
338 /* Release the aout module */
339 module_Unneed( p_aout->p_module );