1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.17 2002/10/03 18:56:09 sam 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 = VLC_FOURCC('s','p','d','i');
57 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
58 p_aout->output.output.i_format
59 = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ?
60 VLC_FOURCC('f','l','3','2') :
61 VLC_FOURCC('f','i','3','2');
63 aout_FormatPrepare( &p_aout->output.output );
65 vlc_mutex_lock( &p_aout->output_fifo_lock );
67 /* Find the best output plug-in. */
68 p_aout->output.p_module = module_Need( p_aout, "audio output",
70 if ( psz_name != NULL ) free( psz_name );
71 if ( p_aout->output.p_module == NULL )
73 msg_Err( p_aout, "no suitable aout module" );
74 vlc_mutex_unlock( &p_aout->output_fifo_lock );
77 aout_FormatPrepare( &p_aout->output.output );
80 aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate );
82 vlc_mutex_unlock( &p_aout->output_fifo_lock );
84 msg_Dbg( p_aout, "output format=%4.4s rate=%d channels=%d",
85 (char *)&p_aout->output.output.i_format,
86 p_aout->output.output.i_rate,
87 p_aout->output.output.i_channels );
89 /* Calculate the resulting mixer output format. */
90 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
91 sizeof(audio_sample_format_t) );
92 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
94 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
95 p_aout->mixer.mixer.i_format
96 = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ?
97 VLC_FOURCC('f','l','3','2') :
98 VLC_FOURCC('f','i','3','2');
99 aout_FormatPrepare( &p_aout->mixer.mixer );
103 p_aout->mixer.mixer.i_format = p_format->i_format;
106 msg_Dbg( p_aout, "mixer format=%4.4s rate=%d channels=%d",
107 (char *)&p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
108 p_aout->mixer.mixer.i_channels );
110 /* Create filters. */
111 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
112 &p_aout->output.i_nb_filters,
113 &p_aout->mixer.mixer,
114 &p_aout->output.output ) < 0 )
116 msg_Err( p_aout, "couldn't set an output pipeline" );
117 module_Unneed( p_aout, p_aout->output.p_module );
121 /* Prepare hints for the buffer allocator. */
122 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
123 p_aout->mixer.output_alloc.i_bytes_per_sec
124 = p_aout->mixer.mixer.i_bytes_per_frame
125 * p_aout->mixer.mixer.i_rate
126 / p_aout->mixer.mixer.i_frame_length;
128 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
129 p_aout->output.i_nb_filters,
130 &p_aout->mixer.output_alloc );
135 /*****************************************************************************
136 * aout_OutputDelete : delete the output
137 *****************************************************************************
138 * This function is entered with the mixer lock.
139 *****************************************************************************/
140 void aout_OutputDelete( aout_instance_t * p_aout )
142 module_Unneed( p_aout, p_aout->output.p_module );
144 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
145 p_aout->output.i_nb_filters );
146 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
149 /*****************************************************************************
150 * aout_OutputPlay : play a buffer
151 *****************************************************************************
152 * This function is entered with the mixer lock.
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 vlc_mutex_lock( &p_aout->output_fifo_lock );
161 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
162 p_aout->output.pf_play( p_aout );
163 vlc_mutex_unlock( &p_aout->output_fifo_lock );
166 /*****************************************************************************
167 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
168 *****************************************************************************
169 * If b_can_sleek is 1, the aout core functions won't try to resample
170 * new buffers to catch up - that is we suppose that the output plug-in can
171 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
172 * This function is entered with no lock at all :-).
173 *****************************************************************************/
174 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
176 vlc_bool_t b_can_sleek )
178 aout_buffer_t * p_buffer;
180 vlc_mutex_lock( &p_aout->output_fifo_lock );
182 p_buffer = p_aout->output.fifo.p_first;
183 while ( p_buffer && p_buffer->start_date < start_date )
185 msg_Dbg( p_aout, "audio output is too slow (%lld), trashing %lldus",
186 start_date - p_buffer->start_date,
187 p_buffer->end_date - p_buffer->start_date );
188 p_buffer = p_buffer->p_next;
191 p_aout->output.fifo.p_first = p_buffer;
192 if ( p_buffer == NULL )
194 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
195 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
196 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
197 vlc_mutex_unlock( &p_aout->output_fifo_lock );
199 "audio output is starving (no input), playing silence" );
203 /* Here we suppose that all buffers have the same duration - this is
204 * generally true, and anyway if it's wrong it won't be a disaster. */
205 if ( p_buffer->start_date > start_date
206 + (p_buffer->end_date - p_buffer->start_date) )
208 vlc_mutex_unlock( &p_aout->output_fifo_lock );
209 msg_Dbg( p_aout, "audio output is starving (%lld), playing silence",
210 p_buffer->start_date - start_date );
215 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
216 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
218 /* Try to compensate the drift by doing some resampling. */
220 mtime_t difference = p_buffer->start_date - start_date;
221 msg_Warn( p_aout, "output date isn't PTS date, resampling (%lld)",
224 vlc_mutex_lock( &p_aout->input_fifos_lock );
225 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
227 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
229 aout_FifoMoveDates( p_aout, p_fifo, difference );
232 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
233 vlc_mutex_unlock( &p_aout->input_fifos_lock );
236 p_aout->output.fifo.p_first = p_buffer->p_next;
237 if ( p_buffer->p_next == NULL )
239 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
242 vlc_mutex_unlock( &p_aout->output_fifo_lock );