1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.7 2002/08/19 21:31:11 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;
50 p_aout->output.p_module = module_Need( p_aout, "audio output",
52 if ( psz_name != NULL ) free( psz_name );
53 if ( p_aout->output.p_module == NULL )
55 msg_Err( p_aout, "no suitable aout module" );
59 /* Retrieve user defaults. */
60 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
61 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
62 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
63 if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
65 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
69 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
70 p_aout->output.output.i_format
71 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
72 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
75 /* Find the best output format. */
76 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
78 msg_Err( p_aout, "couldn't set an output format" );
79 module_Unneed( p_aout, p_aout->output.p_module );
82 aout_FormatPrepare( &p_aout->output.output );
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 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
90 sizeof(audio_sample_format_t) );
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.mixer.i_format
95 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
96 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
97 aout_FormatPrepare( &p_aout->mixer.mixer );
101 p_aout->mixer.mixer.i_format = p_format->i_format;
104 msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
105 p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
106 p_aout->mixer.mixer.i_channels );
108 /* Create filters. */
109 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
110 &p_aout->output.i_nb_filters,
111 &p_aout->mixer.mixer,
112 &p_aout->output.output ) < 0 )
114 msg_Err( p_aout, "couldn't set an output pipeline" );
115 module_Unneed( p_aout, p_aout->output.p_module );
119 /* Prepare hints for the buffer allocator. */
120 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
121 p_aout->mixer.output_alloc.i_bytes_per_sec
122 = p_aout->mixer.mixer.i_bytes_per_frame
123 * p_aout->mixer.mixer.i_rate
124 / p_aout->mixer.mixer.i_frame_length;
126 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
127 p_aout->output.i_nb_filters,
128 &p_aout->mixer.output_alloc );
133 /*****************************************************************************
134 * aout_OutputDelete : delete the output
135 *****************************************************************************/
136 void aout_OutputDelete( aout_instance_t * p_aout )
138 module_Unneed( p_aout, p_aout->output.p_module );
140 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
141 p_aout->output.i_nb_filters );
142 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
145 /*****************************************************************************
146 * aout_OutputPlay : play a buffer
147 *****************************************************************************/
148 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
150 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
151 p_aout->output.i_nb_filters,
154 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
156 p_aout->output.pf_play( p_aout );
159 /*****************************************************************************
160 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
161 *****************************************************************************
162 * If b_can_sleek is 1, the aout core functions won't try to resample
163 * new buffers to catch up - that is we suppose that the output plug-in can
164 * do it by itself. S/PDIF outputs should always set b_can_sleek = 1.
165 *****************************************************************************/
166 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
168 vlc_bool_t b_can_sleek )
170 aout_buffer_t * p_buffer;
172 vlc_mutex_lock( &p_aout->output.fifo.lock );
173 p_buffer = p_aout->output.fifo.p_first;
175 while ( p_buffer != NULL && p_buffer->end_date < start_date )
177 msg_Dbg( p_aout, "audio output is too slow (%lld)",
178 start_date - p_buffer->end_date );
179 p_buffer = p_buffer->p_next;
182 p_aout->output.fifo.p_first = p_buffer;
183 if ( p_buffer == NULL )
185 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
186 vlc_mutex_unlock( &p_aout->output.fifo.lock );
187 msg_Dbg( p_aout, "audio output is starving" );
191 /* Here we suppose that all buffers have the same duration - this is
192 * generally true, and anyway if it's wrong it won't be a disaster. */
193 if ( p_buffer->start_date > start_date
194 + (p_buffer->end_date - p_buffer->start_date) )
196 vlc_mutex_unlock( &p_aout->output.fifo.lock );
197 msg_Dbg( p_aout, "audio output is starving (%lld)",
198 p_buffer->start_date - start_date );
205 /* Try to compensate the drift by doing some resampling. */
208 /* Take the mixer lock because no input can be removed when the
209 * the mixer lock is taken. */
210 vlc_mutex_lock( &p_aout->output.fifo.lock );
211 for ( i = 0; i < p_input->i_nb_inputs; i++ )
213 aout_input_t * p_input = p_aout->pp_inputs[i];
215 vlc_mutex_lock( &p_aout->output.fifo.lock );
219 p_aout->output.fifo.p_first = p_buffer->p_next;
220 if ( p_buffer->p_next == NULL )
222 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
225 vlc_mutex_unlock( &p_aout->output.fifo.lock );