1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.2 2002/08/09 23:47:23 massiot Exp $
7 * Authors: Christophe Massiot <massiot@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 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* calloc(), malloc(), free() */
32 #include "audio_output.h"
33 #include "aout_internal.h"
35 /*****************************************************************************
36 * aout_OutputNew : allocate a new output and rework the filter pipeline
37 *****************************************************************************/
38 int aout_OutputNew( aout_instance_t * p_aout,
39 audio_sample_format_t * p_format )
41 char * psz_name = config_GetPsz( p_aout, "aout" );
42 int i_rate = config_GetInt( p_aout, "aout-rate" );
43 int i_channels = config_GetInt( p_aout, "aout-channels" );
46 vlc_mutex_init( p_aout, &p_aout->output.fifo.lock );
47 p_aout->output.fifo.p_first = NULL;
48 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
49 p_aout->output.last_date = 0;
51 p_aout->output.p_module = module_Need( p_aout, "audio output",
53 if ( psz_name != NULL ) free( psz_name );
54 if ( p_aout->output.p_module == NULL )
56 msg_Err( p_aout, "no suitable aout module" );
60 /* Retrieve user defaults. */
61 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
62 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
63 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
64 if ( p_aout->output.output.i_format != AOUT_FMT_A52 )
66 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
67 p_aout->output.output.i_format
68 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
69 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
72 /* Find the best output format. */
73 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
75 msg_Err( p_aout, "couldn't set an output format" );
76 module_Unneed( p_aout, p_aout->output.p_module );
80 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
81 p_aout->output.output.i_format, p_aout->output.output.i_rate,
82 p_aout->output.output.i_channels );
84 /* Calculate the resulting mixer output format. */
85 p_aout->mixer.output.i_channels = p_aout->output.output.i_channels;
86 p_aout->mixer.output.i_rate = p_aout->output.output.i_rate;
87 if ( p_aout->output.output.i_format != AOUT_FMT_A52 )
89 p_aout->mixer.output.i_format
90 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
91 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
94 /* Calculate the resulting mixer input format. */
95 p_aout->mixer.input.i_channels = -1; /* unchanged */
96 p_aout->mixer.input.i_rate = p_aout->mixer.output.i_rate;
97 p_aout->mixer.input.i_format = p_aout->mixer.output.i_format;
100 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
101 &p_aout->output.i_nb_filters,
102 &p_aout->mixer.output,
103 &p_aout->output.output ) < 0 )
105 msg_Err( p_aout, "couldn't set an output pipeline" );
106 module_Unneed( p_aout, p_aout->output.p_module );
110 /* Prepare hints for the buffer allocator. */
111 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
112 p_aout->mixer.output_alloc.i_bytes_per_sec
113 = aout_FormatToByterate( &p_aout->output.output,
114 p_aout->output.output.i_rate );
116 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
117 p_aout->output.i_nb_filters,
118 &p_aout->mixer.output_alloc );
123 /*****************************************************************************
124 * aout_OutputDelete : delete the output
125 *****************************************************************************/
126 void aout_OutputDelete( aout_instance_t * p_aout )
128 module_Unneed( p_aout, p_aout->output.p_module );
130 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
131 p_aout->output.i_nb_filters );
132 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
135 /*****************************************************************************
136 * aout_OutputPlay : play a buffer
137 *****************************************************************************/
138 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
140 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
141 p_aout->output.i_nb_filters,
144 p_aout->output.pf_play( p_aout, p_buffer );
147 /*****************************************************************************
148 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
149 *****************************************************************************/
150 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
153 aout_buffer_t * p_buffer;
155 vlc_mutex_lock( &p_aout->output.fifo.lock );
156 p_buffer = p_aout->output.fifo.p_first;
158 while ( p_buffer != NULL && p_buffer->end_date < start_date )
160 msg_Dbg( p_aout, "audio output is too slow (%lld)",
161 start_date - p_buffer->end_date );
162 p_buffer = p_buffer->p_next;
165 p_aout->output.fifo.p_first = p_buffer;
166 if ( p_buffer == NULL )
168 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
169 vlc_mutex_unlock( &p_aout->output.fifo.lock );
170 msg_Dbg( p_aout, "audio output is starving" );
174 if ( p_buffer->start_date > start_date
175 + (mtime_t)p_aout->output.i_nb_samples
176 * 1000000 / p_aout->output.output.i_rate )
178 vlc_mutex_unlock( &p_aout->output.fifo.lock );
179 msg_Dbg( p_aout, "audio output is starving (%lld)",
180 p_buffer->start_date - start_date );
184 /* FIXME : there we should handle the case where start_date is not
185 * completely equal to p_buffer->start_date. */
187 p_aout->output.fifo.p_first = p_buffer->p_next;
188 if ( p_buffer->p_next == NULL )
190 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
193 vlc_mutex_unlock( &p_aout->output.fifo.lock );