1 /*****************************************************************************
2 * aout_common.h: audio output inner functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: aout_common.h,v 1.2 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 *****************************************************************************/
24 /* Creating as many aout_Thread functions as configurations was one solution,
25 * examining the different cases in the Thread loop of an unique function was
26 * another. I chose the first solution. */
27 void aout_U8MonoThread ( aout_thread_t * p_aout );
28 void aout_U8StereoThread ( aout_thread_t * p_aout );
29 void aout_S8MonoThread ( aout_thread_t * p_aout );
30 void aout_S8StereoThread ( aout_thread_t * p_aout );
31 void aout_U16MonoThread ( aout_thread_t * p_aout );
32 void aout_U16StereoThread ( aout_thread_t * p_aout );
33 void aout_S16MonoThread ( aout_thread_t * p_aout );
34 void aout_S16StereoThread ( aout_thread_t * p_aout );
36 #define UPDATE_INCREMENT( increment, integer ) \
37 if ( ((increment).l_remainder += (increment).l_euclidean_remainder) >= 0 )\
39 (integer) += (increment).l_euclidean_integer + 1; \
40 (increment).l_remainder -= (increment).l_euclidean_denominator; \
44 (integer) += (increment).l_euclidean_integer; \
47 #define FIFO p_aout->fifo[i_fifo]
49 /*****************************************************************************
51 *****************************************************************************/
52 static __inline__ void InitializeIncrement( aout_increment_t * p_increment,
56 p_increment->l_remainder = -l_denominator;
58 p_increment->l_euclidean_integer = 0;
59 while ( l_numerator >= l_denominator )
61 p_increment->l_euclidean_integer++;
62 l_numerator -= l_denominator;
65 p_increment->l_euclidean_remainder = l_numerator;
67 p_increment->l_euclidean_denominator = l_denominator;
70 /*****************************************************************************
72 *****************************************************************************/
73 static __inline__ int NextFrame( aout_thread_t * p_aout, aout_fifo_t * p_fifo,
78 /* We take the lock */
79 vlc_mutex_lock( &p_fifo->data_lock );
81 /* Are we looking for a dated start frame ? */
82 if ( !p_fifo->b_start_frame )
84 while ( p_fifo->l_start_frame != p_fifo->l_end_frame )
86 if ( p_fifo->date[p_fifo->l_start_frame] != LAST_MDATE )
88 p_fifo->b_start_frame = 1;
89 p_fifo->l_next_frame = (p_fifo->l_start_frame + 1) & AOUT_FIFO_SIZE;
90 p_fifo->l_unit = p_fifo->l_start_frame * (p_fifo->l_frame_size >> (p_fifo->b_stereo));
93 p_fifo->l_start_frame = (p_fifo->l_start_frame + 1) & AOUT_FIFO_SIZE;
96 if ( p_fifo->l_start_frame == p_fifo->l_end_frame )
98 vlc_mutex_unlock( &p_fifo->data_lock );
103 /* We are looking for the next dated frame */
104 /* FIXME : is the output fifo full ?? */
105 while ( !p_fifo->b_next_frame )
107 while ( p_fifo->l_next_frame != p_fifo->l_end_frame )
109 if ( p_fifo->date[p_fifo->l_next_frame] != LAST_MDATE )
111 p_fifo->b_next_frame = 1;
114 p_fifo->l_next_frame = (p_fifo->l_next_frame + 1) & AOUT_FIFO_SIZE;
117 while ( p_fifo->l_next_frame == p_fifo->l_end_frame )
119 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
122 vlc_mutex_unlock( &p_fifo->data_lock );
128 l_units = ((p_fifo->l_next_frame - p_fifo->l_start_frame) & AOUT_FIFO_SIZE) * (p_fifo->l_frame_size >> (p_fifo->b_stereo));
130 l_rate = p_fifo->l_rate + ((aout_date - p_fifo->date[p_fifo->l_start_frame]) / 256);
131 intf_DbgMsg( "aout debug: %lli (%li);", aout_date - p_fifo->date[p_fifo->l_start_frame], l_rate );
133 InitializeIncrement( &p_fifo->unit_increment, l_rate, p_aout->l_rate );
135 p_fifo->l_units = (((l_units - (p_fifo->l_unit -
136 (p_fifo->l_start_frame * (p_fifo->l_frame_size >> (p_fifo->b_stereo)))))
137 * p_aout->l_rate) / l_rate) + 1;
139 /* We release the lock before leaving */
140 vlc_mutex_unlock( &p_fifo->data_lock );