1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: output.c,v 1.39 2003/05/04 23:39:02 gbazin 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 vlc_value_t val, text;
47 /* kludge to avoid a fpu error when rate is 0... */
48 if( i_rate == 0 ) i_rate = -1;
50 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
52 p_aout->output.output.i_rate = i_rate;
53 aout_FormatPrepare( &p_aout->output.output );
55 vlc_mutex_lock( &p_aout->output_fifo_lock );
57 /* Find the best output plug-in. */
58 p_aout->output.p_module = module_Need( p_aout, "audio output", psz_name );
59 if ( psz_name != NULL ) free( psz_name );
60 if ( p_aout->output.p_module == NULL )
62 msg_Err( p_aout, "no suitable aout module" );
63 vlc_mutex_unlock( &p_aout->output_fifo_lock );
67 if ( var_Type( p_aout, "audio-channels" ) ==
68 (VLC_VAR_INTEGER | VLC_VAR_HASCHOICE) )
70 /* The user may have selected a different channels configuration. */
71 var_Get( p_aout, "audio-channels", &val );
73 if ( val.i_int == AOUT_VAR_CHAN_RSTEREO )
75 p_aout->output.output.i_original_channels |=
76 AOUT_CHAN_REVERSESTEREO;
78 else if ( val.i_int == AOUT_VAR_CHAN_STEREO )
80 p_aout->output.output.i_original_channels =
81 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
83 else if ( val.i_int == AOUT_VAR_CHAN_LEFT )
85 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
87 else if ( val.i_int == AOUT_VAR_CHAN_RIGHT )
89 p_aout->output.output.i_original_channels = AOUT_CHAN_RIGHT;
91 else if ( val.i_int == AOUT_VAR_CHAN_DOLBYS )
93 p_aout->output.output.i_original_channels
94 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DOLBYSTEREO;
97 else if ( p_aout->output.output.i_physical_channels == AOUT_CHAN_CENTER
98 && (p_aout->output.output.i_original_channels
99 & AOUT_CHAN_PHYSMASK) == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
101 /* Mono - create the audio-channels variable. */
102 var_Create( p_aout, "audio-channels",
103 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
104 text.psz_string = _("Audio channels");
105 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
107 val.i_int = AOUT_VAR_CHAN_STEREO; text.psz_string = _("Stereo");
108 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
109 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
110 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
111 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
112 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
113 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
115 /* Go directly to the left channel. */
116 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
117 val.i_int = AOUT_VAR_CHAN_LEFT;
118 var_Set( p_aout, "audio-channels", val );
120 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
123 else if ( p_aout->output.output.i_physical_channels ==
124 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
125 && (p_aout->output.output.i_original_channels &
126 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
128 /* Stereo - create the audio-channels variable. */
129 var_Create( p_aout, "audio-channels",
130 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
131 text.psz_string = _("Audio channels");
132 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
134 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
136 val.i_int = AOUT_VAR_CHAN_DOLBYS;
137 text.psz_string = _("Dolby Surround");
141 val.i_int = AOUT_VAR_CHAN_STEREO;
142 text.psz_string = _("Stereo");
144 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
145 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
146 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
147 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
148 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
149 val.i_int = AOUT_VAR_CHAN_RSTEREO; text.psz_string=_("Reverse stereo");
150 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
151 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
153 /* Go directly to the left channel. */
154 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
155 val.i_int = AOUT_VAR_CHAN_LEFT;
156 var_Set( p_aout, "audio-channels", val );
158 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
161 val.b_bool = VLC_TRUE;
162 var_Set( p_aout, "intf-change", val );
164 aout_FormatPrepare( &p_aout->output.output );
167 aout_FifoInit( p_aout, &p_aout->output.fifo,
168 p_aout->output.output.i_rate );
170 vlc_mutex_unlock( &p_aout->output_fifo_lock );
172 aout_FormatPrint( p_aout, "output", &p_aout->output.output );
174 /* Calculate the resulting mixer output format. */
175 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
176 sizeof(audio_sample_format_t) );
177 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
179 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
180 p_aout->mixer.mixer.i_format
181 = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ?
182 VLC_FOURCC('f','l','3','2') :
183 VLC_FOURCC('f','i','3','2');
184 aout_FormatPrepare( &p_aout->mixer.mixer );
188 p_aout->mixer.mixer.i_format = p_format->i_format;
191 aout_FormatPrint( p_aout, "mixer", &p_aout->output.output );
193 /* Create filters. */
194 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
195 &p_aout->output.i_nb_filters,
196 &p_aout->mixer.mixer,
197 &p_aout->output.output ) < 0 )
199 msg_Err( p_aout, "couldn't set an output pipeline" );
200 module_Unneed( p_aout, p_aout->output.p_module );
204 /* Prepare hints for the buffer allocator. */
205 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
206 p_aout->mixer.output_alloc.i_bytes_per_sec
207 = p_aout->mixer.mixer.i_bytes_per_frame
208 * p_aout->mixer.mixer.i_rate
209 / p_aout->mixer.mixer.i_frame_length;
211 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
212 p_aout->output.i_nb_filters,
213 &p_aout->mixer.output_alloc );
215 p_aout->output.b_error = 0;
219 /*****************************************************************************
220 * aout_OutputDelete : delete the output
221 *****************************************************************************
222 * This function is entered with the mixer lock.
223 *****************************************************************************/
224 void aout_OutputDelete( aout_instance_t * p_aout )
226 if ( p_aout->output.b_error )
231 module_Unneed( p_aout, p_aout->output.p_module );
233 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
234 p_aout->output.i_nb_filters );
235 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
237 p_aout->output.b_error = VLC_TRUE;
240 /*****************************************************************************
241 * aout_OutputPlay : play a buffer
242 *****************************************************************************
243 * This function is entered with the mixer lock.
244 *****************************************************************************/
245 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
247 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
248 p_aout->output.i_nb_filters,
251 vlc_mutex_lock( &p_aout->output_fifo_lock );
252 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
253 p_aout->output.pf_play( p_aout );
254 vlc_mutex_unlock( &p_aout->output_fifo_lock );
257 /*****************************************************************************
258 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
259 *****************************************************************************
260 * If b_can_sleek is 1, the aout core functions won't try to resample
261 * new buffers to catch up - that is we suppose that the output plug-in can
262 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
263 * This function is entered with no lock at all :-).
264 *****************************************************************************/
265 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
267 vlc_bool_t b_can_sleek )
269 aout_buffer_t * p_buffer;
271 vlc_mutex_lock( &p_aout->output_fifo_lock );
273 p_buffer = p_aout->output.fifo.p_first;
274 while ( p_buffer && p_buffer->start_date < mdate() )
276 msg_Dbg( p_aout, "audio output is too slow ("I64Fd"), "
277 "trashing "I64Fd"us", mdate() - p_buffer->start_date,
278 p_buffer->end_date - p_buffer->start_date );
279 p_buffer = p_buffer->p_next;
280 aout_BufferFree( p_aout->output.fifo.p_first );
281 p_aout->output.fifo.p_first = p_buffer;
284 if ( p_buffer == NULL )
286 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
288 #if 0 /* This is bad because the audio output might just be trying to fill
289 * in it's internal buffers. And anyway, it's up to the audio output
290 * to deal with this kind of starvation. */
292 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
293 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
294 if ( !p_aout->output.b_starving )
296 "audio output is starving (no input), playing silence" );
297 p_aout->output.b_starving = 1;
300 vlc_mutex_unlock( &p_aout->output_fifo_lock );
304 /* Here we suppose that all buffers have the same duration - this is
305 * generally true, and anyway if it's wrong it won't be a disaster. */
306 if ( p_buffer->start_date > start_date
307 + (p_buffer->end_date - p_buffer->start_date) )
309 vlc_mutex_unlock( &p_aout->output_fifo_lock );
310 if ( !p_aout->output.b_starving )
311 msg_Dbg( p_aout, "audio output is starving ("I64Fd"), "
312 "playing silence", p_buffer->start_date - start_date );
313 p_aout->output.b_starving = 1;
317 p_aout->output.b_starving = 0;
320 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
321 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
323 /* Try to compensate the drift by doing some resampling. */
325 mtime_t difference = start_date - p_buffer->start_date;
326 msg_Warn( p_aout, "output date isn't PTS date, requesting "
327 "resampling ("I64Fd")", difference );
329 vlc_mutex_lock( &p_aout->input_fifos_lock );
330 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
332 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
334 aout_FifoMoveDates( p_aout, p_fifo, difference );
337 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
338 vlc_mutex_unlock( &p_aout->input_fifos_lock );
341 p_aout->output.fifo.p_first = p_buffer->p_next;
342 if ( p_buffer->p_next == NULL )
344 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
347 vlc_mutex_unlock( &p_aout->output_fifo_lock );