1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002-2004 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc_common.h>
35 #include "aout_internal.h"
37 /*****************************************************************************
38 * aout_OutputNew : allocate a new output and rework the filter pipeline
39 *****************************************************************************
40 * This function is entered with the mixer lock.
41 *****************************************************************************/
42 int aout_OutputNew( aout_instance_t * p_aout,
43 audio_sample_format_t * p_format )
45 /* Retrieve user defaults. */
46 int i_rate = config_GetInt( p_aout, "aout-rate" );
47 vlc_value_t val, text;
48 /* kludge to avoid a fpu error when rate is 0... */
49 if( i_rate == 0 ) i_rate = -1;
51 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
53 p_aout->output.output.i_rate = i_rate;
54 aout_FormatPrepare( &p_aout->output.output );
56 /* Find the best output plug-in. */
57 p_aout->output.p_module = module_need( p_aout, "audio output", "$aout", false );
58 if ( p_aout->output.p_module == NULL )
60 msg_Err( p_aout, "no suitable audio output module" );
64 if ( var_Type( p_aout, "audio-channels" ) ==
65 (VLC_VAR_INTEGER | VLC_VAR_HASCHOICE) )
67 /* The user may have selected a different channels configuration. */
68 var_Get( p_aout, "audio-channels", &val );
70 if ( val.i_int == AOUT_VAR_CHAN_RSTEREO )
72 p_aout->output.output.i_original_channels |=
73 AOUT_CHAN_REVERSESTEREO;
75 else if ( val.i_int == AOUT_VAR_CHAN_STEREO )
77 p_aout->output.output.i_original_channels =
78 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
80 else if ( val.i_int == AOUT_VAR_CHAN_LEFT )
82 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
84 else if ( val.i_int == AOUT_VAR_CHAN_RIGHT )
86 p_aout->output.output.i_original_channels = AOUT_CHAN_RIGHT;
88 else if ( val.i_int == AOUT_VAR_CHAN_DOLBYS )
90 p_aout->output.output.i_original_channels
91 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DOLBYSTEREO;
94 else if ( p_aout->output.output.i_physical_channels == AOUT_CHAN_CENTER
95 && (p_aout->output.output.i_original_channels
96 & AOUT_CHAN_PHYSMASK) == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
98 /* Mono - create the audio-channels variable. */
99 var_Create( p_aout, "audio-channels",
100 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
101 text.psz_string = _("Audio Channels");
102 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
104 val.i_int = AOUT_VAR_CHAN_STEREO; text.psz_string = _("Stereo");
105 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
106 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
107 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
108 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
109 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
110 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
112 /* Go directly to the left channel. */
113 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
114 val.i_int = AOUT_VAR_CHAN_LEFT;
115 var_Set( p_aout, "audio-channels", val );
117 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
120 else if ( p_aout->output.output.i_physical_channels ==
121 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
122 && (p_aout->output.output.i_original_channels &
123 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
125 /* Stereo - create the audio-channels variable. */
126 var_Create( p_aout, "audio-channels",
127 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
128 text.psz_string = _("Audio Channels");
129 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
131 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
133 val.i_int = AOUT_VAR_CHAN_DOLBYS;
134 text.psz_string = _("Dolby Surround");
138 val.i_int = AOUT_VAR_CHAN_STEREO;
139 text.psz_string = _("Stereo");
141 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
142 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
143 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
144 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
145 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
146 val.i_int = AOUT_VAR_CHAN_RSTEREO; text.psz_string=_("Reverse stereo");
147 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
148 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
150 /* Go directly to the left channel. */
151 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
152 val.i_int = AOUT_VAR_CHAN_LEFT;
153 var_Set( p_aout, "audio-channels", val );
155 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
159 var_Set( p_aout, "intf-change", val );
161 aout_FormatPrepare( &p_aout->output.output );
163 aout_lock_output_fifo( p_aout );
166 aout_FifoInit( p_aout, &p_aout->output.fifo,
167 p_aout->output.output.i_rate );
169 aout_unlock_output_fifo( p_aout );
171 aout_FormatPrint( p_aout, "output", &p_aout->output.output );
173 /* Calculate the resulting mixer output format. */
174 p_aout->mixer_format = p_aout->output.output;
175 if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
177 /* Non-S/PDIF mixer only deals with float32 or fixed32. */
178 p_aout->mixer_format.i_format
179 = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_FI32;
180 aout_FormatPrepare( &p_aout->mixer_format );
184 p_aout->mixer_format.i_format = p_format->i_format;
187 aout_FormatPrint( p_aout, "mixer", &p_aout->mixer_format );
189 /* Create filters. */
190 p_aout->output.i_nb_filters = 0;
191 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
192 &p_aout->output.i_nb_filters,
193 &p_aout->mixer_format,
194 &p_aout->output.output ) < 0 )
196 msg_Err( p_aout, "couldn't create audio output pipeline" );
197 module_unneed( p_aout, p_aout->output.p_module );
201 /* Prepare hints for the buffer allocator. */
202 p_aout->mixer_allocation.b_alloc = true;
203 p_aout->mixer_allocation.i_bytes_per_sec
204 = p_aout->mixer_format.i_bytes_per_frame
205 * p_aout->mixer_format.i_rate
206 / p_aout->mixer_format.i_frame_length;
208 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
209 p_aout->output.i_nb_filters,
210 &p_aout->mixer_allocation );
212 p_aout->output.b_error = 0;
216 /*****************************************************************************
217 * aout_OutputDelete : delete the output
218 *****************************************************************************
219 * This function is entered with the mixer lock.
220 *****************************************************************************/
221 void aout_OutputDelete( aout_instance_t * p_aout )
223 if ( p_aout->output.b_error )
228 module_unneed( p_aout, p_aout->output.p_module );
230 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
231 p_aout->output.i_nb_filters );
233 aout_lock_output_fifo( p_aout );
234 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
235 aout_unlock_output_fifo( p_aout );
237 p_aout->output.b_error = 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->output.pp_filters, p_aout->output.i_nb_filters,
252 if( p_buffer->i_buffer == 0 )
254 block_Release( p_buffer );
258 aout_lock_output_fifo( p_aout );
259 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
260 p_aout->output.pf_play( p_aout );
261 aout_unlock_output_fifo( p_aout );
264 /*****************************************************************************
265 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
266 *****************************************************************************
267 * If b_can_sleek is 1, the aout core functions won't try to resample
268 * new buffers to catch up - that is we suppose that the output plug-in can
269 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
270 * This function is entered with no lock at all :-).
271 *****************************************************************************/
272 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
276 aout_buffer_t * p_buffer;
278 aout_lock_output_fifo( p_aout );
280 p_buffer = p_aout->output.fifo.p_first;
282 /* Drop the audio sample if the audio output is really late.
283 * In the case of b_can_sleek, we don't use a resampler so we need to be
284 * a lot more severe. */
285 while ( p_buffer && p_buffer->i_pts <
286 (b_can_sleek ? start_date : mdate()) - AOUT_PTS_TOLERANCE )
288 msg_Dbg( p_aout, "audio output is too slow (%"PRId64"), "
289 "trashing %"PRId64"us", mdate() - p_buffer->i_pts,
290 p_buffer->i_length );
291 p_buffer = p_buffer->p_next;
292 aout_BufferFree( p_aout->output.fifo.p_first );
293 p_aout->output.fifo.p_first = p_buffer;
296 if ( p_buffer == NULL )
298 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
300 #if 0 /* This is bad because the audio output might just be trying to fill
301 * in its internal buffers. And anyway, it's up to the audio output
302 * to deal with this kind of starvation. */
304 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
305 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
306 if ( !p_aout->output.b_starving )
308 "audio output is starving (no input), playing silence" );
309 p_aout->output.b_starving = 1;
312 aout_unlock_output_fifo( p_aout );
316 /* Here we suppose that all buffers have the same duration - this is
317 * generally true, and anyway if it's wrong it won't be a disaster.
319 if ( p_buffer->i_pts > start_date + p_buffer->i_length )
321 * + AOUT_PTS_TOLERANCE )
322 * There is no reason to want that, it just worsen the scheduling of
323 * an audio sample after an output starvation (ie. on start or on resume)
327 const mtime_t i_delta = p_buffer->i_pts - start_date;
328 aout_unlock_output_fifo( p_aout );
330 if ( !p_aout->output.b_starving )
331 msg_Dbg( p_aout, "audio output is starving (%"PRId64"), "
332 "playing silence", i_delta );
333 p_aout->output.b_starving = 1;
337 p_aout->output.b_starving = 0;
339 p_aout->output.fifo.p_first = p_buffer->p_next;
340 if ( p_buffer->p_next == NULL )
342 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
346 ( (p_buffer->i_pts - start_date > AOUT_PTS_TOLERANCE)
347 || (start_date - p_buffer->i_pts > AOUT_PTS_TOLERANCE) ) )
349 /* Try to compensate the drift by doing some resampling. */
351 mtime_t difference = start_date - p_buffer->i_pts;
352 msg_Warn( p_aout, "output date isn't PTS date, requesting "
353 "resampling (%"PRId64")", difference );
355 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
356 aout_unlock_output_fifo( p_aout );
358 aout_lock_input_fifos( p_aout );
359 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
361 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->mixer.fifo;
363 aout_FifoMoveDates( p_aout, p_fifo, difference );
365 aout_unlock_input_fifos( p_aout );
368 aout_unlock_output_fifo( p_aout );