1 /*****************************************************************************
2 * output.c : internal management of output streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002-2004 VideoLAN (Centrale Réseaux) and its contributors
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 int i_rate = config_GetInt( p_aout, "aout-rate" );
45 vlc_value_t val, text;
46 /* kludge to avoid a fpu error when rate is 0... */
47 if( i_rate == 0 ) i_rate = -1;
49 memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
51 p_aout->output.output.i_rate = i_rate;
52 aout_FormatPrepare( &p_aout->output.output );
54 vlc_mutex_lock( &p_aout->output_fifo_lock );
56 /* Find the best output plug-in. */
57 p_aout->output.p_module = module_Need( p_aout, "audio output", "$aout", 0);
58 if ( p_aout->output.p_module == NULL )
60 msg_Err( p_aout, "no suitable aout module" );
61 vlc_mutex_unlock( &p_aout->output_fifo_lock );
65 if ( var_Type( p_aout, "audio-channels" ) ==
66 (VLC_VAR_INTEGER | VLC_VAR_HASCHOICE) )
68 /* The user may have selected a different channels configuration. */
69 var_Get( p_aout, "audio-channels", &val );
71 if ( val.i_int == AOUT_VAR_CHAN_RSTEREO )
73 p_aout->output.output.i_original_channels |=
74 AOUT_CHAN_REVERSESTEREO;
76 else if ( val.i_int == AOUT_VAR_CHAN_STEREO )
78 p_aout->output.output.i_original_channels =
79 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
81 else if ( val.i_int == AOUT_VAR_CHAN_LEFT )
83 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
85 else if ( val.i_int == AOUT_VAR_CHAN_RIGHT )
87 p_aout->output.output.i_original_channels = AOUT_CHAN_RIGHT;
89 else if ( val.i_int == AOUT_VAR_CHAN_DOLBYS )
91 p_aout->output.output.i_original_channels
92 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_DOLBYSTEREO;
95 else if ( p_aout->output.output.i_physical_channels == AOUT_CHAN_CENTER
96 && (p_aout->output.output.i_original_channels
97 & AOUT_CHAN_PHYSMASK) == (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT) )
99 /* Mono - create the audio-channels variable. */
100 var_Create( p_aout, "audio-channels",
101 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
102 text.psz_string = _("Audio Channels");
103 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
105 val.i_int = AOUT_VAR_CHAN_STEREO; text.psz_string = _("Stereo");
106 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
107 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
108 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
109 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
110 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
111 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
113 /* Go directly to the left channel. */
114 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
115 val.i_int = AOUT_VAR_CHAN_LEFT;
116 var_Set( p_aout, "audio-channels", val );
118 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
121 else if ( p_aout->output.output.i_physical_channels ==
122 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)
123 && (p_aout->output.output.i_original_channels &
124 (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
126 /* Stereo - create the audio-channels variable. */
127 var_Create( p_aout, "audio-channels",
128 VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
129 text.psz_string = _("Audio Channels");
130 var_Change( p_aout, "audio-channels", VLC_VAR_SETTEXT, &text, NULL );
132 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DOLBYSTEREO )
134 val.i_int = AOUT_VAR_CHAN_DOLBYS;
135 text.psz_string = _("Dolby Surround");
139 val.i_int = AOUT_VAR_CHAN_STEREO;
140 text.psz_string = _("Stereo");
142 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
143 val.i_int = AOUT_VAR_CHAN_LEFT; text.psz_string = _("Left");
144 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
145 val.i_int = AOUT_VAR_CHAN_RIGHT; text.psz_string = _("Right");
146 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
147 val.i_int = AOUT_VAR_CHAN_RSTEREO; text.psz_string=_("Reverse stereo");
148 var_Change( p_aout, "audio-channels", VLC_VAR_ADDCHOICE, &val, &text );
149 if ( p_aout->output.output.i_original_channels & AOUT_CHAN_DUALMONO )
151 /* Go directly to the left channel. */
152 p_aout->output.output.i_original_channels = AOUT_CHAN_LEFT;
153 val.i_int = AOUT_VAR_CHAN_LEFT;
154 var_Set( p_aout, "audio-channels", val );
156 var_AddCallback( p_aout, "audio-channels", aout_ChannelsRestart,
159 val.b_bool = VLC_TRUE;
160 var_Set( p_aout, "intf-change", val );
162 aout_FormatPrepare( &p_aout->output.output );
165 aout_FifoInit( p_aout, &p_aout->output.fifo,
166 p_aout->output.output.i_rate );
168 vlc_mutex_unlock( &p_aout->output_fifo_lock );
170 aout_FormatPrint( p_aout, "output", &p_aout->output.output );
172 /* Calculate the resulting mixer output format. */
173 memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
174 sizeof(audio_sample_format_t) );
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.mixer.i_format
179 = (p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU) ?
180 VLC_FOURCC('f','l','3','2') :
181 VLC_FOURCC('f','i','3','2');
182 aout_FormatPrepare( &p_aout->mixer.mixer );
186 p_aout->mixer.mixer.i_format = p_format->i_format;
189 aout_FormatPrint( p_aout, "mixer", &p_aout->output.output );
191 /* Create filters. */
192 if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
193 &p_aout->output.i_nb_filters,
194 &p_aout->mixer.mixer,
195 &p_aout->output.output ) < 0 )
197 msg_Err( p_aout, "couldn't set an output pipeline" );
198 module_Unneed( p_aout, p_aout->output.p_module );
202 /* Prepare hints for the buffer allocator. */
203 p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
204 p_aout->mixer.output_alloc.i_bytes_per_sec
205 = p_aout->mixer.mixer.i_bytes_per_frame
206 * p_aout->mixer.mixer.i_rate
207 / p_aout->mixer.mixer.i_frame_length;
209 aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
210 p_aout->output.i_nb_filters,
211 &p_aout->mixer.output_alloc );
213 p_aout->output.b_error = 0;
217 /*****************************************************************************
218 * aout_OutputDelete : delete the output
219 *****************************************************************************
220 * This function is entered with the mixer lock.
221 *****************************************************************************/
222 void aout_OutputDelete( aout_instance_t * p_aout )
224 if ( p_aout->output.b_error )
229 module_Unneed( p_aout, p_aout->output.p_module );
231 aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
232 p_aout->output.i_nb_filters );
233 aout_FifoDestroy( p_aout, &p_aout->output.fifo );
235 p_aout->output.b_error = VLC_TRUE;
238 /*****************************************************************************
239 * aout_OutputPlay : play a buffer
240 *****************************************************************************
241 * This function is entered with the mixer lock.
242 *****************************************************************************/
243 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
245 aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
246 p_aout->output.i_nb_filters,
249 if( p_buffer->i_nb_bytes == 0 )
251 aout_BufferFree( p_buffer );
255 vlc_mutex_lock( &p_aout->output_fifo_lock );
256 aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );
257 p_aout->output.pf_play( p_aout );
258 vlc_mutex_unlock( &p_aout->output_fifo_lock );
261 /*****************************************************************************
262 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
263 *****************************************************************************
264 * If b_can_sleek is 1, the aout core functions won't try to resample
265 * new buffers to catch up - that is we suppose that the output plug-in can
266 * compensate it by itself. S/PDIF outputs should always set b_can_sleek = 1.
267 * This function is entered with no lock at all :-).
268 *****************************************************************************/
269 aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
271 vlc_bool_t b_can_sleek )
273 aout_buffer_t * p_buffer;
275 vlc_mutex_lock( &p_aout->output_fifo_lock );
277 p_buffer = p_aout->output.fifo.p_first;
279 /* Drop the audio sample if the audio output is really late.
280 * In the case of b_can_sleek, we don't use a resampler so we need to be
281 * a lot more severe. */
282 while ( p_buffer && p_buffer->start_date <
283 (b_can_sleek ? start_date : mdate()) - AOUT_PTS_TOLERANCE )
285 msg_Dbg( p_aout, "audio output is too slow ("I64Fd"), "
286 "trashing "I64Fd"us", mdate() - p_buffer->start_date,
287 p_buffer->end_date - p_buffer->start_date );
288 p_buffer = p_buffer->p_next;
289 aout_BufferFree( p_aout->output.fifo.p_first );
290 p_aout->output.fifo.p_first = p_buffer;
293 if ( p_buffer == NULL )
295 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
297 #if 0 /* This is bad because the audio output might just be trying to fill
298 * in it's internal buffers. And anyway, it's up to the audio output
299 * to deal with this kind of starvation. */
301 /* Set date to 0, to allow the mixer to send a new buffer ASAP */
302 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
303 if ( !p_aout->output.b_starving )
305 "audio output is starving (no input), playing silence" );
306 p_aout->output.b_starving = 1;
309 vlc_mutex_unlock( &p_aout->output_fifo_lock );
313 /* Here we suppose that all buffers have the same duration - this is
314 * generally true, and anyway if it's wrong it won't be a disaster.
316 if ( p_buffer->start_date > start_date
317 + (p_buffer->end_date - p_buffer->start_date) )
319 * + AOUT_PTS_TOLERANCE )
320 * There is no reason to want that, it just worsen the scheduling of
321 * an audio sample after an output starvation (ie. on start or on resume)
325 vlc_mutex_unlock( &p_aout->output_fifo_lock );
326 if ( !p_aout->output.b_starving )
327 msg_Dbg( p_aout, "audio output is starving ("I64Fd"), "
328 "playing silence", p_buffer->start_date - start_date );
329 p_aout->output.b_starving = 1;
333 p_aout->output.b_starving = 0;
336 ( (p_buffer->start_date - start_date > AOUT_PTS_TOLERANCE)
337 || (start_date - p_buffer->start_date > AOUT_PTS_TOLERANCE) ) )
339 /* Try to compensate the drift by doing some resampling. */
341 mtime_t difference = start_date - p_buffer->start_date;
342 msg_Warn( p_aout, "output date isn't PTS date, requesting "
343 "resampling ("I64Fd")", difference );
345 vlc_mutex_lock( &p_aout->input_fifos_lock );
346 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
348 aout_fifo_t * p_fifo = &p_aout->pp_inputs[i]->fifo;
350 aout_FifoMoveDates( p_aout, p_fifo, difference );
353 aout_FifoMoveDates( p_aout, &p_aout->output.fifo, difference );
354 vlc_mutex_unlock( &p_aout->input_fifos_lock );
357 p_aout->output.fifo.p_first = p_buffer->p_next;
358 if ( p_buffer->p_next == NULL )
360 p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
363 vlc_mutex_unlock( &p_aout->output_fifo_lock );