1 /*****************************************************************************
2 * input.c : internal management of input streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: input.c,v 1.31 2003/01/26 13:37:09 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() */
36 #include "audio_output.h"
37 #include "aout_internal.h"
39 /*****************************************************************************
40 * aout_InputNew : allocate a new input and rework the filter pipeline
41 *****************************************************************************/
42 int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input )
44 audio_sample_format_t intermediate_format, headphone_intermediate_format;
45 aout_filter_t * p_headphone_filter;
46 vlc_bool_t b_use_headphone_filter = VLC_FALSE;
48 aout_FormatPrint( p_aout, "input", &p_input->input );
51 aout_FifoInit( p_aout, &p_input->fifo, p_aout->mixer.mixer.i_rate );
52 p_input->p_first_byte_to_mix = NULL;
54 /* Prepare format structure */
55 memcpy( &intermediate_format, &p_aout->mixer.mixer,
56 sizeof(audio_sample_format_t) );
57 intermediate_format.i_rate = p_input->input.i_rate;
59 /* Headphone filter add-ons. */
60 memcpy( &headphone_intermediate_format, &p_aout->mixer.mixer,
61 sizeof(audio_sample_format_t) );
62 headphone_intermediate_format.i_rate = p_input->input.i_rate;
63 if ( config_GetInt( p_aout , "headphone" ) )
65 /* Do we use heaphone filter ? */
66 if ( intermediate_format.i_physical_channels
67 == ( AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT )
68 && ( intermediate_format.i_format != VLC_FOURCC('f','l','3','2')
69 || intermediate_format.i_format != VLC_FOURCC('f','i','3','2')
72 b_use_headphone_filter = VLC_TRUE;
75 if ( b_use_headphone_filter == VLC_TRUE )
77 /* Split the filter pipeline. */
78 headphone_intermediate_format.i_physical_channels = p_input->input.i_physical_channels;
79 headphone_intermediate_format.i_original_channels = p_input->input.i_original_channels;
80 headphone_intermediate_format.i_bytes_per_frame =
81 headphone_intermediate_format.i_bytes_per_frame
82 * aout_FormatNbChannels( &headphone_intermediate_format )
83 / aout_FormatNbChannels( &intermediate_format );
87 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_filters,
88 &p_input->i_nb_filters, &p_input->input,
89 &headphone_intermediate_format ) < 0 )
91 msg_Err( p_aout, "couldn't set an input pipeline" );
93 aout_FifoDestroy( p_aout, &p_input->fifo );
99 /* Headphone filter add-ons. */
100 if ( b_use_headphone_filter == VLC_TRUE )
102 /* create a vlc object */
103 p_headphone_filter = vlc_object_create( p_aout
104 , sizeof(aout_filter_t) );
105 if ( p_headphone_filter == NULL )
107 msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
108 aout_FifoDestroy( p_aout, &p_input->fifo );
109 p_input->b_error = 1;
112 vlc_object_attach( p_headphone_filter, p_aout );
114 /* find the headphone filter */
115 memcpy( &p_headphone_filter->input, &headphone_intermediate_format
116 , sizeof(audio_sample_format_t) );
117 memcpy( &p_headphone_filter->output, &intermediate_format
118 , sizeof(audio_sample_format_t) );
119 p_headphone_filter->p_module = module_Need( p_headphone_filter, "audio filter"
121 if ( p_headphone_filter->p_module == NULL )
123 vlc_object_detach( p_headphone_filter );
124 vlc_object_destroy( p_headphone_filter );
126 msg_Err( p_aout, "couldn't open the headphone virtual spatialization module" );
127 aout_FifoDestroy( p_aout, &p_input->fifo );
128 p_input->b_error = 1;
133 p_headphone_filter->b_reinit = VLC_TRUE;
134 p_input->pp_filters[p_input->i_nb_filters++] = p_headphone_filter;
137 /* Prepare hints for the buffer allocator. */
138 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
139 p_input->input_alloc.i_bytes_per_sec = -1;
141 if ( AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
143 p_input->i_nb_resamplers = 0;
147 /* Create resamplers. */
148 intermediate_format.i_rate = (__MAX(p_input->input.i_rate,
149 p_aout->mixer.mixer.i_rate)
150 * (100 + AOUT_MAX_RESAMPLING)) / 100;
151 if ( intermediate_format.i_rate == p_aout->mixer.mixer.i_rate )
153 /* Just in case... */
154 intermediate_format.i_rate++;
156 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_resamplers,
157 &p_input->i_nb_resamplers,
158 &intermediate_format,
159 &p_aout->mixer.mixer ) < 0 )
161 msg_Err( p_aout, "couldn't set a resampler pipeline" );
163 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
164 p_input->i_nb_filters );
165 aout_FifoDestroy( p_aout, &p_input->fifo );
166 p_input->b_error = 1;
171 aout_FiltersHintBuffers( p_aout, p_input->pp_resamplers,
172 p_input->i_nb_resamplers,
173 &p_input->input_alloc );
175 /* Setup the initial rate of the resampler */
176 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
178 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
180 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
181 p_input->input_alloc.i_bytes_per_sec = -1;
182 aout_FiltersHintBuffers( p_aout, p_input->pp_filters,
183 p_input->i_nb_filters,
184 &p_input->input_alloc );
186 /* i_bytes_per_sec is still == -1 if no filters */
187 p_input->input_alloc.i_bytes_per_sec = __MAX(
188 p_input->input_alloc.i_bytes_per_sec,
189 (int)(p_input->input.i_bytes_per_frame
190 * p_input->input.i_rate
191 / p_input->input.i_frame_length) );
192 /* Allocate in the heap, it is more convenient for the decoder. */
193 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
195 p_input->b_error = 0;
200 /*****************************************************************************
201 * aout_InputDelete : delete an input
202 *****************************************************************************
203 * This function must be entered with the mixer lock.
204 *****************************************************************************/
205 int aout_InputDelete( aout_instance_t * p_aout, aout_input_t * p_input )
207 if ( p_input->b_error ) return 0;
209 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
210 p_input->i_nb_filters );
211 aout_FiltersDestroyPipeline( p_aout, p_input->pp_resamplers,
212 p_input->i_nb_resamplers );
213 aout_FifoDestroy( p_aout, &p_input->fifo );
218 /*****************************************************************************
219 * aout_InputPlay : play a buffer
220 *****************************************************************************
221 * This function must be entered with the input lock.
222 *****************************************************************************/
223 int aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
224 aout_buffer_t * p_buffer )
228 /* We don't care if someone changes the start date behind our back after
229 * this. We'll deal with that when pushing the buffer, and compensate
230 * with the next incoming buffer. */
231 vlc_mutex_lock( &p_aout->input_fifos_lock );
232 start_date = aout_FifoNextStart( p_aout, &p_input->fifo );
233 vlc_mutex_unlock( &p_aout->input_fifos_lock );
235 if ( start_date != 0 && start_date < mdate() )
237 /* The decoder is _very_ late. This can only happen if the user
238 * pauses the stream (or if the decoder is buggy, which cannot
240 msg_Warn( p_aout, "computed PTS is out of range ("I64Fd"), "
241 "clearing out", mdate() - start_date );
242 vlc_mutex_lock( &p_aout->input_fifos_lock );
243 aout_FifoSet( p_aout, &p_input->fifo, 0 );
244 p_input->p_first_byte_to_mix = NULL;
245 vlc_mutex_unlock( &p_aout->input_fifos_lock );
246 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
247 msg_Warn( p_aout, "timing screwed, stopping resampling" );
248 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
249 if ( p_input->i_nb_resamplers != 0 )
251 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
252 p_input->pp_resamplers[0]->b_reinit = VLC_TRUE;
257 if ( p_buffer->start_date < mdate() + AOUT_MIN_PREPARE_TIME )
259 /* The decoder gives us f*cked up PTS. It's its business, but we
260 * can't present it anyway, so drop the buffer. */
261 msg_Warn( p_aout, "PTS is out of range ("I64Fd"), dropping buffer",
262 mdate() - p_buffer->start_date );
263 aout_BufferFree( p_buffer );
268 if ( start_date == 0 ) start_date = p_buffer->start_date;
270 /* Run pre-filters. */
271 aout_FiltersPlay( p_aout, p_input->pp_filters, p_input->i_nb_filters,
274 /* Run the resampler if needed.
275 * We first need to calculate the output rate of this resampler. */
276 if ( ( p_input->i_resampling_type == AOUT_RESAMPLING_NONE ) &&
277 ( start_date < p_buffer->start_date - AOUT_PTS_TOLERANCE
278 || start_date > p_buffer->start_date + AOUT_PTS_TOLERANCE ) &&
279 p_input->i_nb_resamplers > 0 )
281 /* Can happen in several circumstances :
282 * 1. A problem at the input (clock drift)
283 * 2. A small pause triggered by the user
284 * 3. Some delay in the output stage, causing a loss of lip
286 * Solution : resample the buffer to avoid a scratch.
288 mtime_t drift = p_buffer->start_date - start_date;
290 p_input->i_resamp_start_date = mdate();
291 p_input->i_resamp_start_drift = (int)drift;
294 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
296 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
298 msg_Warn( p_aout, "buffer is "I64Fd" %s, triggering %ssampling",
299 drift > 0 ? drift : -drift,
300 drift > 0 ? "in advance" : "late",
301 drift > 0 ? "down" : "up");
304 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
306 /* Resampling has been triggered previously (because of dates
307 * mismatch). We want the resampling to happen progressively so
308 * it isn't too audible to the listener. */
310 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
312 p_input->pp_resamplers[0]->input.i_rate += 10; /* Hz */
316 p_input->pp_resamplers[0]->input.i_rate -= 10; /* Hz */
319 /* Check if everything is back to normal, in which case we can stop the
321 if( p_input->pp_resamplers[0]->input.i_rate ==
322 p_input->input.i_rate )
324 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
325 msg_Warn( p_aout, "resampling stopped after "I64Fi" usec",
326 mdate() - p_input->i_resamp_start_date );
328 else if( abs( (int)(p_buffer->start_date - start_date) ) <
329 abs( p_input->i_resamp_start_drift ) / 2 )
331 /* if we reduced the drift from half, then it is time to switch
332 * back the resampling direction. */
333 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
334 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
336 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
337 p_input->i_resamp_start_drift = 0;
339 else if( p_input->i_resamp_start_drift &&
340 ( abs( (int)(p_buffer->start_date - start_date) ) >
341 abs( p_input->i_resamp_start_drift ) * 3 / 2 ) )
343 /* If the drift is increasing and not decreasing, than something
344 * is bad. We'd better stop the resampling right now. */
345 msg_Warn( p_aout, "timing screwed, stopping resampling" );
346 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
347 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
351 /* Adding the start date will be managed by aout_FifoPush(). */
352 p_buffer->end_date = start_date +
353 (p_buffer->end_date - p_buffer->start_date);
354 p_buffer->start_date = start_date;
356 /* Actually run the resampler now. */
357 if ( p_input->i_nb_resamplers > 0 && p_aout->mixer.mixer.i_rate !=
358 p_input->pp_resamplers[0]->input.i_rate )
360 aout_FiltersPlay( p_aout, p_input->pp_resamplers,
361 p_input->i_nb_resamplers,
365 vlc_mutex_lock( &p_aout->input_fifos_lock );
366 aout_FifoPush( p_aout, &p_input->fifo, p_buffer );
367 vlc_mutex_unlock( &p_aout->input_fifos_lock );