1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.15 2002/09/26 22:40:25 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 * This function is entered with the mixer lock.
39 *****************************************************************************/
40 int aout_OutputNew( aout_instance_t * p_aout,
41 audio_sample_format_t * p_format )
43 /* Retrieve user defaults. */
44 char * psz_name = config_GetPsz( p_aout, "aout" );
45 int i_rate = config_GetInt( p_aout, "aout-rate" );
46 int i_channels = config_GetInt( p_aout, "aout-channels" );
48 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
49 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
50 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
51 if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
53 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
57 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
58 p_aout->output.output.i_format
59 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
60 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
62 aout_FormatPrepare( &p_aout->output.output );
64 vlc_mutex_lock( &p_aout->output_fifo_lock );
66 /* Find the best output plug-in. */
67 p_aout->output.p_module = module_Need( p_aout, "audio output",
69 if ( psz_name != NULL ) free( psz_name );
70 if ( p_aout->output.p_module == NULL )
72 msg_Err( p_aout, "no suitable aout module" );
73 vlc_mutex_unlock( &p_aout->output_fifo_lock );
76 aout_FormatPrepare( &p_aout->output.output );
79 aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate );
81 vlc_mutex_unlock( &p_aout->output_fifo_lock );
83 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
84 p_aout->output.output.i_format, p_aout->output.output.i_rate,
85 p_aout->output.output.i_channels );
87 /* Calculate the resulting mixer output format. */
88 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
89 sizeof(audio_sample_format_t) );
90 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
92 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
93 p_aout->mixer.mixer.i_format
94 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
95 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
96 aout_FormatPrepare( &p_aout->mixer.mixer );
100 p_aout->mixer.mixer.i_format = p_format->i_format;
103 msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
104 p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
105 p_aout->mixer.mixer.i_channels );
107 /* Create filters. */
108 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
109 &p_aout->output.i_nb_filters,
110 &p_aout->mixer.mixer,
111 &p_aout->output.output ) < 0 )
113 msg_Err( p_aout, "couldn't set an output pipeline" );
114 module_Unneed( p_aout, p_aout->output.p_module );
118 /* Prepare hints for the buffer allocator. */
119 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
120 p_aout->mixer.output_alloc.i_bytes_per_sec
121 = p_aout->mixer.mixer.i_bytes_per_frame
122 * p_aout->mixer.mixer.i_rate
123 / p_aout->mixer.mixer.i_frame_length;
125 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
126 p_aout->output.i_nb_filters,
127 &p_aout->mixer.output_alloc );
132 /*****************************************************************************
133 * aout_OutputDelete : delete the output
134 *****************************************************************************
135 * This function is entered with the mixer lock.
136 *****************************************************************************/
137 void aout_OutputDelete( aout_instance_t * p_aout )
139 module_Unneed( p_aout, p_aout->output.p_module );
141 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
142 p_aout->output.i_nb_filters );
143 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
146 /*****************************************************************************
147 * aout_OutputPlay : play a buffer
148 *****************************************************************************
149 * This function is entered with the mixer lock.
150 *****************************************************************************/
151 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
153 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
154 p_aout->output.i_nb_filters,
157 vlc_mutex_lock( &p_aout->output_fifo_lock );
158 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
159 p_aout->output.pf_play( p_aout );
160 vlc_mutex_unlock( &p_aout->output_fifo_lock );
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 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
169 * This function is entered with no lock at all :-).
170 *****************************************************************************/
171 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
173 vlc_bool_t b_can_sleek )
175 aout_buffer_t * p_buffer;
177 vlc_mutex_lock( &p_aout->output_fifo_lock );
179 p_buffer = p_aout->output.fifo.p_first;
180 while ( p_buffer && p_buffer->start_date < start_date )
182 msg_Dbg( p_aout, "audio output is too slow (%lld), trashing %lldus",
183 start_date - p_buffer->start_date,
184 p_buffer->end_date - p_buffer->start_date );
185 p_buffer = p_buffer->p_next;
188 p_aout->output.fifo.p_first = p_buffer;
189 if ( p_buffer == NULL )
191 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
192 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
193 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
194 vlc_mutex_unlock( &p_aout->output_fifo_lock );
196 "audio output is starving (no input), playing silence" );
200 /* Here we suppose that all buffers have the same duration - this is
201 * generally true, and anyway if it's wrong it won't be a disaster. */
202 if ( p_buffer->start_date > start_date
203 + (p_buffer->end_date - p_buffer->start_date) )
205 vlc_mutex_unlock( &p_aout->output_fifo_lock );
206 msg_Dbg( p_aout, "audio output is starving (%lld), playing silence",
207 p_buffer->start_date - start_date );
212 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
213 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
215 /* Try to compensate the drift by doing some resampling. */
217 mtime_t difference = p_buffer->start_date - start_date;
218 msg_Warn( p_aout, "output date isn't PTS date, resampling (%lld)",
221 vlc_mutex_lock( &p_aout->input_fifos_lock );
222 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
224 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
226 aout_FifoMoveDates( p_aout, p_fifo, difference );
229 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
230 vlc_mutex_unlock( &p_aout->input_fifos_lock );
233 p_aout->output.fifo.p_first = p_buffer->p_next;
234 if ( p_buffer->p_next == NULL )
236 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
239 vlc_mutex_unlock( &p_aout->output_fifo_lock );