1 /*****************************************************************************
2 * input.c : internal management of input streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: input.c,v 1.38 2003/09/02 18:06:45 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"
40 /*****************************************************************************
41 * aout_InputNew : allocate a new input and rework the filter pipeline
42 *****************************************************************************/
43 int aout_InputNew( aout_instance_t * p_aout, aout_input_t * p_input )
45 audio_sample_format_t intermediate_format;
49 aout_FormatPrint( p_aout, "input", &p_input->input );
52 aout_FifoInit( p_aout, &p_input->fifo, p_aout->mixer.mixer.i_rate );
53 p_input->p_first_byte_to_mix = NULL;
55 /* Prepare format structure */
56 memcpy( &intermediate_format, &p_aout->mixer.mixer,
57 sizeof(audio_sample_format_t) );
58 intermediate_format.i_rate = p_input->input.i_rate;
61 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_filters,
62 &p_input->i_nb_filters,
67 msg_Err( p_aout, "couldn't set an input pipeline" );
69 aout_FifoDestroy( p_aout, &p_input->fifo );
74 /* Now add user filters */
75 if( ( psz_filters = config_GetPsz( p_aout , "audio-filter" ) ) )
77 char *psz_parser = psz_filters;
79 audio_sample_format_t format_in, format_out;
81 memcpy( &format_in, &p_aout->mixer.mixer,
82 sizeof( audio_sample_format_t ) );
83 memcpy( &format_out,&p_aout->mixer.mixer,
84 sizeof( audio_sample_format_t ) );
86 format_in.i_rate = p_input->input.i_rate;
87 format_out.i_rate = p_input->input.i_rate;
89 while( psz_parser && *psz_parser )
91 aout_filter_t * p_filter;
93 if( p_input->i_nb_filters >= AOUT_MAX_FILTERS )
95 msg_Dbg( p_aout, "max filter reached (%d)", AOUT_MAX_FILTERS );
99 while( *psz_parser == ' ' && *psz_parser == ',' )
103 if( ( psz_next = strchr( psz_parser , ',' ) ) )
107 if( *psz_parser =='\0' )
112 msg_Dbg( p_aout, "user filter %s", psz_parser );
114 /* Create a VLC object */
115 p_filter = vlc_object_create( p_aout, sizeof(aout_filter_t) );
116 if( p_filter == NULL )
118 msg_Err( p_aout, "cannot add user filter %s (skipped)",
120 psz_parser = psz_next;
124 vlc_object_attach( p_filter , p_aout );
125 memcpy( &p_filter->input, &format_in,
126 sizeof(audio_sample_format_t) );
127 memcpy( &p_filter->output, &format_out,
128 sizeof(audio_sample_format_t) );
131 module_Need( p_filter,"audio filter", psz_parser );
133 if( p_filter->p_module== NULL )
135 msg_Err( p_aout, "cannot add user filter %s (skipped)",
138 vlc_object_detach( p_filter );
139 vlc_object_destroy( p_filter );
140 psz_parser = psz_next;
144 p_filter->b_continuity = VLC_FALSE;
146 p_input->pp_filters[p_input->i_nb_filters++] = p_filter;
148 /* next filter if any */
149 psz_parser = psz_next;
155 /* Prepare hints for the buffer allocator. */
156 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
157 p_input->input_alloc.i_bytes_per_sec = -1;
159 if ( AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
161 p_input->i_nb_resamplers = 0;
165 /* Create resamplers. */
166 intermediate_format.i_rate = (__MAX(p_input->input.i_rate,
167 p_aout->mixer.mixer.i_rate)
168 * (100 + AOUT_MAX_RESAMPLING)) / 100;
169 if ( intermediate_format.i_rate == p_aout->mixer.mixer.i_rate )
171 /* Just in case... */
172 intermediate_format.i_rate++;
174 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_resamplers,
175 &p_input->i_nb_resamplers,
176 &intermediate_format,
177 &p_aout->mixer.mixer ) < 0 )
179 msg_Err( p_aout, "couldn't set a resampler pipeline" );
181 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
182 p_input->i_nb_filters );
183 aout_FifoDestroy( p_aout, &p_input->fifo );
184 p_input->b_error = 1;
189 aout_FiltersHintBuffers( p_aout, p_input->pp_resamplers,
190 p_input->i_nb_resamplers,
191 &p_input->input_alloc );
193 /* Setup the initial rate of the resampler */
194 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
196 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
198 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
199 aout_FiltersHintBuffers( p_aout, p_input->pp_filters,
200 p_input->i_nb_filters,
201 &p_input->input_alloc );
203 /* i_bytes_per_sec is still == -1 if no filters */
204 p_input->input_alloc.i_bytes_per_sec = __MAX(
205 p_input->input_alloc.i_bytes_per_sec,
206 (int)(p_input->input.i_bytes_per_frame
207 * p_input->input.i_rate
208 / p_input->input.i_frame_length) );
209 /* Allocate in the heap, it is more convenient for the decoder. */
210 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
212 p_input->b_error = 0;
217 /*****************************************************************************
218 * aout_InputDelete : delete an input
219 *****************************************************************************
220 * This function must be entered with the mixer lock.
221 *****************************************************************************/
222 int aout_InputDelete( aout_instance_t * p_aout, aout_input_t * p_input )
224 if ( p_input->b_error ) return 0;
226 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
227 p_input->i_nb_filters );
228 aout_FiltersDestroyPipeline( p_aout, p_input->pp_resamplers,
229 p_input->i_nb_resamplers );
230 aout_FifoDestroy( p_aout, &p_input->fifo );
235 /*****************************************************************************
236 * aout_InputPlay : play a buffer
237 *****************************************************************************
238 * This function must be entered with the input lock.
239 *****************************************************************************/
240 int aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
241 aout_buffer_t * p_buffer )
245 /* We don't care if someone changes the start date behind our back after
246 * this. We'll deal with that when pushing the buffer, and compensate
247 * with the next incoming buffer. */
248 vlc_mutex_lock( &p_aout->input_fifos_lock );
249 start_date = aout_FifoNextStart( p_aout, &p_input->fifo );
250 vlc_mutex_unlock( &p_aout->input_fifos_lock );
252 if ( start_date != 0 && start_date < mdate() )
254 /* The decoder is _very_ late. This can only happen if the user
255 * pauses the stream (or if the decoder is buggy, which cannot
257 msg_Warn( p_aout, "computed PTS is out of range ("I64Fd"), "
258 "clearing out", mdate() - start_date );
259 vlc_mutex_lock( &p_aout->input_fifos_lock );
260 aout_FifoSet( p_aout, &p_input->fifo, 0 );
261 p_input->p_first_byte_to_mix = NULL;
262 vlc_mutex_unlock( &p_aout->input_fifos_lock );
263 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
264 msg_Warn( p_aout, "timing screwed, stopping resampling" );
265 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
266 if ( p_input->i_nb_resamplers != 0 )
268 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
269 p_input->pp_resamplers[0]->b_continuity = VLC_FALSE;
274 if ( p_buffer->start_date < mdate() + AOUT_MIN_PREPARE_TIME )
276 /* The decoder gives us f*cked up PTS. It's its business, but we
277 * can't present it anyway, so drop the buffer. */
278 msg_Warn( p_aout, "PTS is out of range ("I64Fd"), dropping buffer",
279 mdate() - p_buffer->start_date );
280 aout_BufferFree( p_buffer );
281 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
282 if ( p_input->i_nb_resamplers != 0 )
284 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
285 p_input->pp_resamplers[0]->b_continuity = VLC_FALSE;
290 if ( start_date == 0 ) start_date = p_buffer->start_date;
292 /* Run pre-filters. */
294 aout_FiltersPlay( p_aout, p_input->pp_filters, p_input->i_nb_filters,
297 /* Run the resampler if needed.
298 * We first need to calculate the output rate of this resampler. */
299 if ( ( p_input->i_resampling_type == AOUT_RESAMPLING_NONE ) &&
300 ( start_date < p_buffer->start_date - AOUT_PTS_TOLERANCE
301 || start_date > p_buffer->start_date + AOUT_PTS_TOLERANCE ) &&
302 p_input->i_nb_resamplers > 0 )
304 /* Can happen in several circumstances :
305 * 1. A problem at the input (clock drift)
306 * 2. A small pause triggered by the user
307 * 3. Some delay in the output stage, causing a loss of lip
309 * Solution : resample the buffer to avoid a scratch.
311 mtime_t drift = p_buffer->start_date - start_date;
313 p_input->i_resamp_start_date = mdate();
314 p_input->i_resamp_start_drift = (int)drift;
317 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
319 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
321 msg_Warn( p_aout, "buffer is "I64Fd" %s, triggering %ssampling",
322 drift > 0 ? drift : -drift,
323 drift > 0 ? "in advance" : "late",
324 drift > 0 ? "down" : "up");
327 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
329 /* Resampling has been triggered previously (because of dates
330 * mismatch). We want the resampling to happen progressively so
331 * it isn't too audible to the listener. */
333 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
335 p_input->pp_resamplers[0]->input.i_rate += 10; /* Hz */
339 p_input->pp_resamplers[0]->input.i_rate -= 10; /* Hz */
342 /* Check if everything is back to normal, in which case we can stop the
344 if( p_input->pp_resamplers[0]->input.i_rate ==
345 p_input->input.i_rate )
347 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
348 msg_Warn( p_aout, "resampling stopped after "I64Fi" usec",
349 mdate() - p_input->i_resamp_start_date );
351 else if( abs( (int)(p_buffer->start_date - start_date) ) <
352 abs( p_input->i_resamp_start_drift ) / 2 )
354 /* if we reduced the drift from half, then it is time to switch
355 * back the resampling direction. */
356 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
357 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
359 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
360 p_input->i_resamp_start_drift = 0;
362 else if( p_input->i_resamp_start_drift &&
363 ( abs( (int)(p_buffer->start_date - start_date) ) >
364 abs( p_input->i_resamp_start_drift ) * 3 / 2 ) )
366 /* If the drift is increasing and not decreasing, than something
367 * is bad. We'd better stop the resampling right now. */
368 msg_Warn( p_aout, "timing screwed, stopping resampling" );
369 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
370 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
374 /* Adding the start date will be managed by aout_FifoPush(). */
375 p_buffer->end_date = start_date +
376 (p_buffer->end_date - p_buffer->start_date);
377 p_buffer->start_date = start_date;
379 /* Actually run the resampler now. */
380 if ( p_input->i_nb_resamplers > 0 )
382 aout_FiltersPlay( p_aout, p_input->pp_resamplers,
383 p_input->i_nb_resamplers,
387 vlc_mutex_lock( &p_aout->input_fifos_lock );
388 aout_FifoPush( p_aout, &p_input->fifo, p_buffer );
389 vlc_mutex_unlock( &p_aout->input_fifos_lock );