1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.19 2002/10/21 20:00:10 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 = 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 if ( p_aout->output.output.i_channels == AOUT_CHAN_DOLBY )
65 /* Do not do Dolby surround unless the user requests it. */
66 p_aout->output.output.i_channels = AOUT_CHAN_STEREO;
69 aout_FormatPrepare( &p_aout->output.output );
71 vlc_mutex_lock( &p_aout->output_fifo_lock );
73 /* Find the best output plug-in. */
74 p_aout->output.p_module = module_Need( p_aout, "audio output",
76 if ( psz_name != NULL ) free( psz_name );
77 if ( p_aout->output.p_module == NULL )
79 msg_Err( p_aout, "no suitable aout module" );
80 vlc_mutex_unlock( &p_aout->output_fifo_lock );
83 aout_FormatPrepare( &p_aout->output.output );
86 aout_FifoInit( p_aout, &p_aout->output.fifo, p_aout->output.output.i_rate );
88 vlc_mutex_unlock( &p_aout->output_fifo_lock );
90 aout_FormatPrint( p_aout, "output", &p_aout->output.output );
92 /* Calculate the resulting mixer output format. */
93 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
94 sizeof(audio_sample_format_t) );
95 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
97 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
98 p_aout->mixer.mixer.i_format
99 = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ?
100 VLC_FOURCC('f','l','3','2') :
101 VLC_FOURCC('f','i','3','2');
102 aout_FormatPrepare( &p_aout->mixer.mixer );
106 p_aout->mixer.mixer.i_format = p_format->i_format;
109 aout_FormatPrint( p_aout, "mixer", &p_aout->output.output );
111 /* Create filters. */
112 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
113 &p_aout->output.i_nb_filters,
114 &p_aout->mixer.mixer,
115 &p_aout->output.output ) < 0 )
117 msg_Err( p_aout, "couldn't set an output pipeline" );
118 module_Unneed( p_aout, p_aout->output.p_module );
122 /* Prepare hints for the buffer allocator. */
123 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
124 p_aout->mixer.output_alloc.i_bytes_per_sec
125 = p_aout->mixer.mixer.i_bytes_per_frame
126 * p_aout->mixer.mixer.i_rate
127 / p_aout->mixer.mixer.i_frame_length;
129 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
130 p_aout->output.i_nb_filters,
131 &p_aout->mixer.output_alloc );
136 /*****************************************************************************
137 * aout_OutputDelete : delete the output
138 *****************************************************************************
139 * This function is entered with the mixer lock.
140 *****************************************************************************/
141 void aout_OutputDelete( aout_instance_t * p_aout )
143 module_Unneed( p_aout, p_aout->output.p_module );
145 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
146 p_aout->output.i_nb_filters );
147 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
150 /*****************************************************************************
151 * aout_OutputPlay : play a buffer
152 *****************************************************************************
153 * This function is entered with the mixer lock.
154 *****************************************************************************/
155 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
157 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
158 p_aout->output.i_nb_filters,
161 vlc_mutex_lock( &p_aout->output_fifo_lock );
162 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
163 p_aout->output.pf_play( p_aout );
164 vlc_mutex_unlock( &p_aout->output_fifo_lock );
167 /*****************************************************************************
168 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
169 *****************************************************************************
170 * If b_can_sleek is 1, the aout core functions won't try to resample
171 * new buffers to catch up - that is we suppose that the output plug-in can
172 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
173 * This function is entered with no lock at all :-).
174 *****************************************************************************/
175 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
177 vlc_bool_t b_can_sleek )
179 aout_buffer_t * p_buffer;
181 vlc_mutex_lock( &p_aout->output_fifo_lock );
183 p_buffer = p_aout->output.fifo.p_first;
184 while ( p_buffer && p_buffer->start_date < start_date )
186 msg_Dbg( p_aout, "audio output is too slow (%lld), trashing %lldus",
187 start_date - p_buffer->start_date,
188 p_buffer->end_date - p_buffer->start_date );
189 p_buffer = p_buffer->p_next;
192 p_aout->output.fifo.p_first = p_buffer;
193 if ( p_buffer == NULL )
195 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
196 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
197 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
198 vlc_mutex_unlock( &p_aout->output_fifo_lock );
199 if ( !p_aout->output.b_starving )
201 "audio output is starving (no input), playing silence" );
202 p_aout->output.b_starving = 1;
206 /* Here we suppose that all buffers have the same duration - this is
207 * generally true, and anyway if it's wrong it won't be a disaster. */
208 if ( p_buffer->start_date > start_date
209 + (p_buffer->end_date - p_buffer->start_date) )
211 vlc_mutex_unlock( &p_aout->output_fifo_lock );
212 if ( !p_aout->output.b_starving )
213 msg_Dbg( p_aout, "audio output is starving (%lld), playing silence",
214 p_buffer->start_date - start_date );
215 p_aout->output.b_starving = 1;
219 p_aout->output.b_starving = 0;
222 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
223 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
225 /* Try to compensate the drift by doing some resampling. */
227 mtime_t difference = p_buffer->start_date - start_date;
228 msg_Warn( p_aout, "output date isn't PTS date, resampling (%lld)",
231 vlc_mutex_lock( &p_aout->input_fifos_lock );
232 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
234 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
236 aout_FifoMoveDates( p_aout, p_fifo, difference );
239 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
240 vlc_mutex_unlock( &p_aout->input_fifos_lock );
243 p_aout->output.fifo.p_first = p_buffer->p_next;
244 if ( p_buffer->p_next == NULL )
246 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
249 vlc_mutex_unlock( &p_aout->output_fifo_lock );