1 /*****************************************************************************
2 * audio_output.c : audio output thread
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: audio_output.c,v 1.75 2002/01/28 23:08:31 stef 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 = main_GetIntVariable( AOUT_RATE_VAR, l_rate );
97 p_aout->i_channels = 1 + main_GetIntVariable( AOUT_STEREO_VAR,
100 intf_WarnMsg( 3, "aout_CreateThread: channels == %d, rate == %d",
104 /* Maybe we should pass this setting in argument */
105 p_aout->i_format = AOUT_FORMAT_DEFAULT;
107 /* special setting for ac3 pass-through mode */
108 /* FIXME is it necessary ? (cf ac3_adec.c) */
109 if( main_GetIntVariable( AOUT_SPDIF_VAR, 0 ) && p_main->b_ac3 )
111 intf_WarnMsg( 4, "aout info: setting ac3 spdif" );
112 p_aout->i_format = AOUT_FMT_AC3;
115 if( p_aout->l_rate == 0 )
117 intf_ErrMsg( "aout error: null sample rate" );
122 /* FIXME: only works for i_channels == 1 or 2 ?? */
123 p_aout->b_stereo = ( p_aout->i_channels == 2 ) ? 1 : 0;
125 /* Choose the best module */
126 p_aout->p_module = module_Need( MODULE_CAPABILITY_AOUT,
127 main_GetPszVariable( AOUT_METHOD_VAR, NULL ),
130 if( p_aout->p_module == NULL )
132 intf_ErrMsg( "aout error: no suitable aout module" );
137 #define aout_functions p_aout->p_module->p_functions->aout.functions.aout
138 p_aout->pf_open = aout_functions.pf_open;
139 p_aout->pf_setformat = aout_functions.pf_setformat;
140 p_aout->pf_getbufinfo = aout_functions.pf_getbufinfo;
141 p_aout->pf_play = aout_functions.pf_play;
142 p_aout->pf_close = aout_functions.pf_close;
143 #undef aout_functions
146 * Initialize audio device
148 if ( p_aout->pf_open( p_aout ) )
150 module_Unneed( p_aout->p_module );
155 if ( p_aout->pf_setformat( p_aout ) )
157 p_aout->pf_close( p_aout );
158 module_Unneed( p_aout->p_module );
163 /* Initialize the volume level */
164 p_aout->i_volume = main_GetIntVariable( AOUT_VOLUME_VAR, VOLUME_DEFAULT );
165 p_aout->i_savedvolume = 0;
167 /* FIXME: maybe it would be cleaner to change SpawnThread prototype
168 * see vout to handle status correctly ?? however, it is not critical since
169 * this thread is only called in main and all calls are blocking */
170 if( aout_SpawnThread( p_aout ) )
172 p_aout->pf_close( p_aout );
173 module_Unneed( p_aout->p_module );
182 /*****************************************************************************
183 * Declare the different aout thread functions
184 *****************************************************************************/
185 DECLARE_AOUT_THREAD( S16, s16, ( p_aout->s32_buffer[l_buffer] /
188 DECLARE_AOUT_THREAD( U16, u16, (( p_aout->s32_buffer[l_buffer] /
189 AOUT_MAX_FIFOS) + 128) )
191 DECLARE_AOUT_THREAD( U8, u8, (( p_aout->s32_buffer[l_buffer] /
192 AOUT_MAX_FIFOS / 256) + 128 ) )
194 DECLARE_AOUT_THREAD( S8, s8, ( p_aout->s32_buffer[l_buffer] /
195 AOUT_MAX_FIFOS / 256) )
198 /*****************************************************************************
200 *****************************************************************************/
201 static int aout_SpawnThread( aout_thread_t * p_aout )
205 void (* pf_aout_thread)( aout_thread_t * ) = NULL;
207 /* We want the audio output thread to live */
209 p_aout->b_active = 1;
211 /* Initialize the fifos lock */
212 vlc_mutex_init( &p_aout->fifos_lock );
213 /* Initialize audio fifos : set all fifos as empty and initialize locks */
214 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
216 p_aout->fifo[i_fifo].i_type = AOUT_EMPTY_FIFO;
217 vlc_mutex_init( &p_aout->fifo[i_fifo].data_lock );
218 vlc_cond_init( &p_aout->fifo[i_fifo].data_wait );
221 /* Compute the size (in audio units) of the audio output buffer. Although
222 * AOUT_BUFFER_DURATION is given in microseconds, the output rate is given
223 * in Hz, that's why we need to divide by 10^6 microseconds (1 second) */
224 p_aout->l_units = (long)( ((s64)p_aout->l_rate * AOUT_BUFFER_DURATION) / 1000000 );
225 p_aout->l_msleep = (long)( ((s64)p_aout->l_units * 1000000) / (s64)p_aout->l_rate );
227 /* Make pf_aout_thread point to the right thread function, and compute the
228 * byte size of the audio output buffer */
229 switch ( p_aout->i_channels )
231 /* Audio output is mono */
233 switch ( p_aout->i_format )
236 intf_WarnMsg( 2, "aout info: unsigned 8 bits mono thread" );
237 l_bytes = 1 * sizeof(u8) * p_aout->l_units;
238 pf_aout_thread = aout_U8Thread;
242 intf_WarnMsg( 2, "aout info: signed 8 bits mono thread" );
243 l_bytes = 1 * sizeof(s8) * p_aout->l_units;
244 pf_aout_thread = aout_S8Thread;
247 case AOUT_FMT_U16_LE:
248 case AOUT_FMT_U16_BE:
249 intf_WarnMsg( 2, "aout info: unsigned 16 bits mono thread" );
250 l_bytes = 1 * sizeof(u16) * p_aout->l_units;
251 pf_aout_thread = aout_U16Thread;
254 case AOUT_FMT_S16_LE:
255 case AOUT_FMT_S16_BE:
256 intf_WarnMsg( 2, "aout info: signed 16 bits mono thread" );
257 l_bytes = 1 * sizeof(s16) * p_aout->l_units;
258 pf_aout_thread = aout_S16Thread;
262 intf_ErrMsg( "aout error: unknown audio output format (%i)",
268 /* Audio output is stereo */
270 switch ( p_aout->i_format )
273 intf_WarnMsg( 2, "aout info: unsigned 8 bits stereo thread" );
274 l_bytes = 2 * sizeof(u8) * p_aout->l_units;
275 pf_aout_thread = aout_U8Thread;
279 intf_WarnMsg( 2, "aout info: signed 8 bits stereo thread" );
280 l_bytes = 2 * sizeof(s8) * p_aout->l_units;
281 pf_aout_thread = aout_S8Thread;
284 case AOUT_FMT_U16_LE:
285 case AOUT_FMT_U16_BE:
286 intf_WarnMsg( 2, "aout info: unsigned 16 bits stereo thread" );
287 l_bytes = 2 * sizeof(u16) * p_aout->l_units;
288 pf_aout_thread = aout_U16Thread;
291 case AOUT_FMT_S16_LE:
292 case AOUT_FMT_S16_BE:
293 intf_WarnMsg( 2, "aout info: signed 16 bits stereo thread" );
294 l_bytes = 2 * sizeof(s16) * p_aout->l_units;
295 pf_aout_thread = aout_S16Thread;
299 intf_WarnMsg( 2, "aout info: ac3 pass-through thread" );
300 l_bytes = SPDIF_FRAME_SIZE;
301 pf_aout_thread = aout_SpdifThread;
305 intf_ErrMsg( "aout error: unknown audio output format %i",
312 intf_ErrMsg( "aout error: unknown number of audio channels (%i)",
313 p_aout->i_channels );
317 /* Allocate the memory needed by the audio output buffers, and set to zero
318 * the s32 buffer's memory */
319 p_aout->buffer = malloc( l_bytes );
320 if ( p_aout->buffer == NULL )
322 intf_ErrMsg( "aout error: cannot create output buffer" );
326 p_aout->s32_buffer = (s32 *)calloc( p_aout->l_units,
327 sizeof(s32) << ( p_aout->b_stereo ) );
328 if ( p_aout->s32_buffer == NULL )
330 intf_ErrMsg( "aout error: cannot create the s32 output buffer" );
331 free( p_aout->buffer );
335 /* Rough estimate of the playing date */
336 p_aout->date = mdate() + p_main->i_desync;
338 /* Launch the thread */
339 if ( vlc_thread_create( &p_aout->thread_id, "audio output",
340 (vlc_thread_func_t)pf_aout_thread, p_aout ) )
342 intf_ErrMsg( "aout error: cannot spawn audio output thread" );
343 free( p_aout->buffer );
344 free( p_aout->s32_buffer );
348 intf_WarnMsg( 2, "aout info: audio output thread %i spawned", getpid() );
352 /*****************************************************************************
354 *****************************************************************************/
355 void aout_DestroyThread( aout_thread_t * p_aout, int *pi_status )
359 /* FIXME: pi_status is not handled correctly: check vout how to do!?? */
361 /* Ask thread to kill itself and wait until it's done */
363 vlc_thread_join( p_aout->thread_id ); /* only if pi_status is NULL */
365 /* Free the allocated memory */
366 free( p_aout->buffer );
367 free( p_aout->s32_buffer );
369 /* Destroy the condition and mutex locks */
370 for ( i_fifo = 0; i_fifo < AOUT_MAX_FIFOS; i_fifo++ )
372 vlc_mutex_destroy( &p_aout->fifo[i_fifo].data_lock );
373 vlc_cond_destroy( &p_aout->fifo[i_fifo].data_wait );
375 vlc_mutex_destroy( &p_aout->fifos_lock );
377 /* Free the plugin */
378 p_aout->pf_close( p_aout );
380 /* Release the aout module */
381 module_Unneed( p_aout->p_module );