1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.5 2002/08/14 00:23:59 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 ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
66 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
70 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
71 p_aout->output.output.i_format
72 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
73 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
76 /* Find the best output format. */
77 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
79 msg_Err( p_aout, "couldn't set an output format" );
80 module_Unneed( p_aout, p_aout->output.p_module );
84 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
85 p_aout->output.output.i_format, p_aout->output.output.i_rate,
86 p_aout->output.output.i_channels );
88 /* Calculate the resulting mixer output format. */
89 p_aout->mixer.output.i_channels = p_aout->output.output.i_channels;
90 p_aout->mixer.output.i_rate = p_aout->output.output.i_rate;
91 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
93 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
94 p_aout->mixer.output.i_format
95 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
96 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
97 p_aout->mixer.output.i_bytes_per_sec
98 = aout_FormatToByterate( &p_aout->mixer.output );
102 p_aout->mixer.output.i_format = p_format->i_format;
103 p_aout->mixer.output.i_bytes_per_sec = p_format->i_bytes_per_sec;
106 msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
107 p_aout->mixer.output.i_format, p_aout->mixer.output.i_rate,
108 p_aout->mixer.output.i_channels );
110 /* Calculate the resulting mixer input format. */
111 p_aout->mixer.input.i_channels = -1; /* unchanged */
112 p_aout->mixer.input.i_rate = p_aout->mixer.output.i_rate;
113 p_aout->mixer.input.i_format = p_aout->mixer.output.i_format;
114 p_aout->mixer.input.i_bytes_per_sec = p_aout->mixer.output.i_bytes_per_sec;
116 /* Create filters. */
117 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
118 &p_aout->output.i_nb_filters,
119 &p_aout->mixer.output,
120 &p_aout->output.output ) < 0 )
122 msg_Err( p_aout, "couldn't set an output pipeline" );
123 module_Unneed( p_aout, p_aout->output.p_module );
127 /* Prepare hints for the buffer allocator. */
128 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
129 p_aout->mixer.output_alloc.i_bytes_per_sec
130 = aout_FormatToByterate( &p_aout->output.output );
132 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
133 p_aout->output.i_nb_filters,
134 &p_aout->mixer.output_alloc );
139 /*****************************************************************************
140 * aout_OutputDelete : delete the output
141 *****************************************************************************/
142 void aout_OutputDelete( aout_instance_t * p_aout )
144 module_Unneed( p_aout, p_aout->output.p_module );
146 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
147 p_aout->output.i_nb_filters );
148 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
151 /*****************************************************************************
152 * aout_OutputPlay : play a buffer
153 *****************************************************************************/
154 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
156 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
157 p_aout->output.i_nb_filters,
160 p_aout->output.pf_play( p_aout, p_buffer );
163 /*****************************************************************************
164 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
165 *****************************************************************************
166 * If b_can_sleek is 1, the aout core functions won't try to resample
167 * new buffers to catch up - that is we suppose that the output plug-in can
168 * do it by itself. S/PDIF outputs should always set b_can_sleek = 1.
169 *****************************************************************************/
170 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
171 mtime_t start_date /*,
172 vlc_bool_t b_can_sleek */ )
174 aout_buffer_t * p_buffer;
176 vlc_mutex_lock( &p_aout->output.fifo.lock );
177 p_buffer = p_aout->output.fifo.p_first;
179 while ( p_buffer != NULL && p_buffer->end_date < start_date )
181 msg_Dbg( p_aout, "audio output is too slow (%lld)",
182 start_date - p_buffer->end_date );
183 p_buffer = p_buffer->p_next;
186 p_aout->output.fifo.p_first = p_buffer;
187 if ( p_buffer == NULL )
189 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
190 vlc_mutex_unlock( &p_aout->output.fifo.lock );
191 msg_Dbg( p_aout, "audio output is starving" );
195 /* Here we suppose that all buffers have the same duration - this is
196 * generally true, and anyway if it's wrong it won't be a disaster. */
197 if ( p_buffer->start_date > start_date
198 + (p_buffer->end_date - p_buffer->start_date) )
200 vlc_mutex_unlock( &p_aout->output.fifo.lock );
201 msg_Dbg( p_aout, "audio output is starving (%lld)",
202 p_buffer->start_date - start_date );
209 /* Try to compensate the drift by doing some resampling. */
212 /* Take the mixer lock because no input can be removed when the
213 * the mixer lock is taken. */
214 vlc_mutex_lock( &p_aout->mixer_lock );
215 for ( i = 0; i < p_input->i_nb_inputs; i++ )
217 aout_input_t * p_input = p_aout->pp_inputs[i];
219 vlc_mutex_lock( &p_aout->mixer_lock );
223 p_aout->output.fifo.p_first = p_buffer->p_next;
224 if ( p_buffer->p_next == NULL )
226 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
229 vlc_mutex_unlock( &p_aout->output.fifo.lock );