1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.13 2002/08/30 22:22:24 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 char * psz_name = config_GetPsz( p_aout, "aout" );
44 int i_rate = config_GetInt( p_aout, "aout-rate" );
45 int i_channels = config_GetInt( p_aout, "aout-channels" );
47 p_aout->output.p_module = module_Need( p_aout, "audio output",
49 if ( psz_name != NULL ) free( psz_name );
50 if ( p_aout->output.p_module == NULL )
52 msg_Err( p_aout, "no suitable aout module" );
56 /* Retrieve user defaults. */
57 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
58 if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
59 if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
60 if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
62 p_aout->output.output.i_format = AOUT_FMT_SPDIF;
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 vlc_mutex_lock( &p_aout->output_fifo_lock );
74 /* Find the best output format. */
75 if ( p_aout->output.pf_setformat( p_aout ) != 0 )
77 msg_Err( p_aout, "couldn't set an output format" );
78 module_Unneed( p_aout, p_aout->output.p_module );
79 vlc_mutex_unlock( &p_aout->output_fifo_lock );
82 aout_FormatPrepare( &p_aout->output.output );
85 aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate );
87 vlc_mutex_unlock( &p_aout->output_fifo_lock );
89 msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
90 p_aout->output.output.i_format, p_aout->output.output.i_rate,
91 p_aout->output.output.i_channels );
93 /* Calculate the resulting mixer output format. */
94 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
95 sizeof(audio_sample_format_t) );
96 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
98 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
99 p_aout->mixer.mixer.i_format
100 = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
101 AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
102 aout_FormatPrepare( &p_aout->mixer.mixer );
106 p_aout->mixer.mixer.i_format = p_format->i_format;
109 msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
110 p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
111 p_aout->mixer.mixer.i_channels );
113 /* Create filters. */
114 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
115 &p_aout->output.i_nb_filters,
116 &p_aout->mixer.mixer,
117 &p_aout->output.output ) < 0 )
119 msg_Err( p_aout, "couldn't set an output pipeline" );
120 module_Unneed( p_aout, p_aout->output.p_module );
124 /* Prepare hints for the buffer allocator. */
125 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
126 p_aout->mixer.output_alloc.i_bytes_per_sec
127 = p_aout->mixer.mixer.i_bytes_per_frame
128 * p_aout->mixer.mixer.i_rate
129 / p_aout->mixer.mixer.i_frame_length;
131 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
132 p_aout->output.i_nb_filters,
133 &p_aout->mixer.output_alloc );
138 /*****************************************************************************
139 * aout_OutputDelete : delete the output
140 *****************************************************************************
141 * This function is entered with the mixer_lock.
142 *****************************************************************************/
143 void aout_OutputDelete( aout_instance_t * p_aout )
145 module_Unneed( p_aout, p_aout->output.p_module );
147 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
148 p_aout->output.i_nb_filters );
149 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
152 /*****************************************************************************
153 * aout_OutputPlay : play a buffer
154 *****************************************************************************
155 * This function is entered with the mixer_lock.
156 *****************************************************************************/
157 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
159 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
160 p_aout->output.i_nb_filters,
163 vlc_mutex_lock( &p_aout->output_fifo_lock );
164 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
165 p_aout->output.pf_play( p_aout );
166 vlc_mutex_unlock( &p_aout->output_fifo_lock );
169 /*****************************************************************************
170 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
171 *****************************************************************************
172 * If b_can_sleek is 1, the aout core functions won't try to resample
173 * new buffers to catch up - that is we suppose that the output plug-in can
174 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
175 *****************************************************************************/
176 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
178 vlc_bool_t b_can_sleek )
180 aout_buffer_t * p_buffer;
182 vlc_mutex_lock( &p_aout->output_fifo_lock );
184 p_buffer = p_aout->output.fifo.p_first;
185 while ( p_buffer && p_buffer->start_date < start_date )
187 msg_Dbg( p_aout, "audio output is too slow (%lld), trashing %lldus",
188 start_date - p_buffer->start_date,
189 p_buffer->end_date - p_buffer->start_date );
190 p_buffer = p_buffer->p_next;
193 p_aout->output.fifo.p_first = p_buffer;
194 if ( p_buffer == NULL )
196 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
197 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
198 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
199 vlc_mutex_unlock( &p_aout->output_fifo_lock );
201 "audio output is starving (no input), playing silence" );
205 /* Here we suppose that all buffers have the same duration - this is
206 * generally true, and anyway if it's wrong it won't be a disaster. */
207 if ( p_buffer->start_date > start_date
208 + (p_buffer->end_date - p_buffer->start_date) )
210 vlc_mutex_unlock( &p_aout->output_fifo_lock );
211 msg_Dbg( p_aout, "audio output is starving (%lld), playing silence",
212 p_buffer->start_date - start_date );
217 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
218 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
220 /* Try to compensate the drift by doing some resampling. */
222 mtime_t difference = p_buffer->start_date - start_date;
223 msg_Warn( p_aout, "output date isn't PTS date, resampling (%lld)",
226 vlc_mutex_lock( &p_aout->input_fifos_lock );
227 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
229 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
231 aout_FifoMoveDates( p_aout, p_fifo, difference );
234 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
235 vlc_mutex_unlock( &p_aout->input_fifos_lock );
238 p_aout->output.fifo.p_first = p_buffer->p_next;
239 if ( p_buffer->p_next == NULL )
241 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
244 vlc_mutex_unlock( &p_aout->output_fifo_lock );