1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.8 2002/08/19 23:12:57 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 aout_FifoInit( p_aout, &p_aout->output.fifo );
48 p_aout->output.p_module = module_Need( p_aout, "audio output",
50 if ( psz_name != NULL ) free( psz_name );
51 if ( p_aout->output.p_module == NULL )
53 msg_Err( p_aout, "no suitable aout module" );
57 /* Retrieve user defaults. */
58 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
59 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
60 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
61 if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
63 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
67 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
68 p_aout->output.output.i_format
69 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
70 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
73 /* Find the best output format. */
74 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
76 msg_Err( p_aout, "couldn't set an output format" );
77 module_Unneed( p_aout, p_aout->output.p_module );
80 aout_FormatPrepare( &p_aout->output.output );
82 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
83 p_aout->output.output.i_format, p_aout->output.output.i_rate,
84 p_aout->output.output.i_channels );
86 /* Calculate the resulting mixer output format. */
87 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
88 sizeof(audio_sample_format_t) );
89 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
91 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
92 p_aout->mixer.mixer.i_format
93 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
94 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
95 aout_FormatPrepare( &p_aout->mixer.mixer );
99 p_aout->mixer.mixer.i_format = p_format->i_format;
102 msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
103 p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
104 p_aout->mixer.mixer.i_channels );
106 /* Create filters. */
107 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
108 &p_aout->output.i_nb_filters,
109 &p_aout->mixer.mixer,
110 &p_aout->output.output ) < 0 )
112 msg_Err( p_aout, "couldn't set an output pipeline" );
113 module_Unneed( p_aout, p_aout->output.p_module );
117 /* Prepare hints for the buffer allocator. */
118 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
119 p_aout->mixer.output_alloc.i_bytes_per_sec
120 = p_aout->mixer.mixer.i_bytes_per_frame
121 * p_aout->mixer.mixer.i_rate
122 / p_aout->mixer.mixer.i_frame_length;
124 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
125 p_aout->output.i_nb_filters,
126 &p_aout->mixer.output_alloc );
131 /*****************************************************************************
132 * aout_OutputDelete : delete the output
133 *****************************************************************************/
134 void aout_OutputDelete( aout_instance_t * p_aout )
136 module_Unneed( p_aout, p_aout->output.p_module );
138 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
139 p_aout->output.i_nb_filters );
140 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
143 /*****************************************************************************
144 * aout_OutputPlay : play a buffer
145 *****************************************************************************/
146 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
148 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
149 p_aout->output.i_nb_filters,
152 /* Please remember that we have the mixer_lock in this function. */
153 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
155 p_aout->output.pf_play( p_aout );
158 /*****************************************************************************
159 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
160 *****************************************************************************
161 * If b_can_sleek is 1, the aout core functions won't try to resample
162 * new buffers to catch up - that is we suppose that the output plug-in can
163 * do it by itself. S/PDIF outputs should always set b_can_sleek = 1.
164 *****************************************************************************/
165 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
167 vlc_bool_t b_can_sleek )
169 aout_buffer_t * p_buffer;
171 vlc_mutex_lock( &p_aout->mixer_lock );
172 p_buffer = p_aout->output.fifo.p_first;
174 while ( p_buffer != NULL && p_buffer->end_date < start_date )
176 msg_Dbg( p_aout, "audio output is too slow (%lld)",
177 start_date - p_buffer->end_date );
178 p_buffer = p_buffer->p_next;
181 p_aout->output.fifo.p_first = p_buffer;
182 if ( p_buffer == NULL )
184 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
185 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
186 p_aout->output.fifo.end_date = 0;
187 vlc_mutex_unlock( &p_aout->mixer_lock );
188 msg_Dbg( p_aout, "audio output is starving" );
192 /* Here we suppose that all buffers have the same duration - this is
193 * generally true, and anyway if it's wrong it won't be a disaster. */
194 if ( p_buffer->start_date > start_date
195 + (p_buffer->end_date - p_buffer->start_date) )
197 vlc_mutex_unlock( &p_aout->mixer_lock );
198 msg_Dbg( p_aout, "audio output is starving (%lld)",
199 p_buffer->start_date - start_date );
206 /* Try to compensate the drift by doing some resampling. */
209 /* Take the mixer lock because no input can be removed when the
210 * the mixer lock is taken. */
211 vlc_mutex_lock( &p_aout->output.fifo.lock );
212 for ( i = 0; i < p_input->i_nb_inputs; i++ )
214 aout_input_t * p_input = p_aout->pp_inputs[i];
216 vlc_mutex_lock( &p_aout->output.fifo.lock );
220 p_aout->output.fifo.p_first = p_buffer->p_next;
221 if ( p_buffer->p_next == NULL )
223 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
226 vlc_mutex_unlock( &p_aout->mixer_lock );