1 /*****************************************************************************
2 * aout_common.h: audio output inner functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
6 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
23 /* Creating as many aout_Thread functions as configurations was one solution,
24 * examining the different cases in the Thread loop of an unique function was
25 * another. I chose the first solution. */
26 void aout_U8MonoThread ( aout_thread_t * p_aout );
27 void aout_U8StereoThread ( aout_thread_t * p_aout );
28 void aout_S8MonoThread ( aout_thread_t * p_aout );
29 void aout_S8StereoThread ( aout_thread_t * p_aout );
30 void aout_U16MonoThread ( aout_thread_t * p_aout );
31 void aout_U16StereoThread ( aout_thread_t * p_aout );
32 void aout_S16MonoThread ( aout_thread_t * p_aout );
33 void aout_S16StereoThread ( aout_thread_t * p_aout );
35 #define UPDATE_INCREMENT( increment, integer ) \
36 if ( ((increment).l_remainder += (increment).l_euclidean_remainder) >= 0 )\
38 (integer) += (increment).l_euclidean_integer + 1; \
39 (increment).l_remainder -= (increment).l_euclidean_denominator; \
43 (integer) += (increment).l_euclidean_integer; \
46 #define FIFO p_aout->fifo[i_fifo]
48 /*****************************************************************************
50 *****************************************************************************/
51 static __inline__ void InitializeIncrement( aout_increment_t * p_increment,
55 p_increment->l_remainder = -l_denominator;
57 p_increment->l_euclidean_integer = 0;
58 while ( l_numerator >= l_denominator )
60 p_increment->l_euclidean_integer++;
61 l_numerator -= l_denominator;
64 p_increment->l_euclidean_remainder = l_numerator;
66 p_increment->l_euclidean_denominator = l_denominator;
69 /*****************************************************************************
71 *****************************************************************************/
72 static __inline__ int NextFrame( aout_thread_t * p_aout, aout_fifo_t * p_fifo,
77 /* We take the lock */
78 vlc_mutex_lock( &p_fifo->data_lock );
80 /* Are we looking for a dated start frame ? */
81 if ( !p_fifo->b_start_frame )
83 while ( p_fifo->l_start_frame != p_fifo->l_end_frame )
85 if ( p_fifo->date[p_fifo->l_start_frame] != LAST_MDATE )
87 p_fifo->b_start_frame = 1;
88 p_fifo->l_next_frame = (p_fifo->l_start_frame + 1) & AOUT_FIFO_SIZE;
89 p_fifo->l_unit = p_fifo->l_start_frame * (p_fifo->l_frame_size >> (p_fifo->b_stereo));
92 p_fifo->l_start_frame = (p_fifo->l_start_frame + 1) & AOUT_FIFO_SIZE;
95 if ( p_fifo->l_start_frame == p_fifo->l_end_frame )
97 vlc_mutex_unlock( &p_fifo->data_lock );
102 /* We are looking for the next dated frame */
103 /* FIXME : is the output fifo full ?? */
104 while ( !p_fifo->b_next_frame )
106 while ( p_fifo->l_next_frame != p_fifo->l_end_frame )
108 if ( p_fifo->date[p_fifo->l_next_frame] != LAST_MDATE )
110 p_fifo->b_next_frame = 1;
113 p_fifo->l_next_frame = (p_fifo->l_next_frame + 1) & AOUT_FIFO_SIZE;
116 while ( p_fifo->l_next_frame == p_fifo->l_end_frame )
118 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
121 vlc_mutex_unlock( &p_fifo->data_lock );
127 l_units = ((p_fifo->l_next_frame - p_fifo->l_start_frame) & AOUT_FIFO_SIZE) * (p_fifo->l_frame_size >> (p_fifo->b_stereo));
129 l_rate = p_fifo->l_rate + ((aout_date - p_fifo->date[p_fifo->l_start_frame]) / 256);
130 intf_DbgMsg( "aout debug: %lli (%li);", aout_date - p_fifo->date[p_fifo->l_start_frame], l_rate );
132 InitializeIncrement( &p_fifo->unit_increment, l_rate, p_aout->l_rate );
134 p_fifo->l_units = (((l_units - (p_fifo->l_unit -
135 (p_fifo->l_start_frame * (p_fifo->l_frame_size >> (p_fifo->b_stereo)))))
136 * p_aout->l_rate) / l_rate) + 1;
138 /* We release the lock before leaving */
139 vlc_mutex_unlock( &p_fifo->data_lock );