1 /*****************************************************************************
2 * input.c : internal management of input streams for the audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: input.c,v 1.26 2002/12/06 10:10:39 sam 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;
46 aout_FormatPrint( p_aout, "input", &p_input->input );
49 aout_FifoInit( p_aout, &p_input->fifo, p_aout->mixer.mixer.i_rate );
50 p_input->p_first_byte_to_mix = NULL;
53 memcpy( &intermediate_format, &p_aout->mixer.mixer,
54 sizeof(audio_sample_format_t) );
55 intermediate_format.i_rate = p_input->input.i_rate;
56 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_filters,
57 &p_input->i_nb_filters, &p_input->input,
58 &intermediate_format ) < 0 )
60 msg_Err( p_aout, "couldn't set an input pipeline" );
62 aout_FifoDestroy( p_aout, &p_input->fifo );
68 /* Prepare hints for the buffer allocator. */
69 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
70 p_input->input_alloc.i_bytes_per_sec = -1;
72 if ( AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
74 p_input->i_nb_resamplers = 0;
78 /* Create resamplers. */
79 intermediate_format.i_rate = (p_input->input.i_rate
80 * (100 + AOUT_MAX_RESAMPLING)) / 100;
81 if ( intermediate_format.i_rate == p_aout->mixer.mixer.i_rate )
84 intermediate_format.i_rate++;
86 if ( aout_FiltersCreatePipeline( p_aout, p_input->pp_resamplers,
87 &p_input->i_nb_resamplers,
89 &p_aout->mixer.mixer ) < 0 )
91 msg_Err( p_aout, "couldn't set a resampler pipeline" );
93 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
94 p_input->i_nb_filters );
95 aout_FifoDestroy( p_aout, &p_input->fifo );
101 aout_FiltersHintBuffers( p_aout, p_input->pp_resamplers,
102 p_input->i_nb_resamplers,
103 &p_input->input_alloc );
105 /* Setup the initial rate of the resampler */
106 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
108 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
110 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
111 p_input->input_alloc.i_bytes_per_sec = -1;
112 aout_FiltersHintBuffers( p_aout, p_input->pp_filters,
113 p_input->i_nb_filters,
114 &p_input->input_alloc );
116 /* i_bytes_per_sec is still == -1 if no filters */
117 p_input->input_alloc.i_bytes_per_sec = __MAX(
118 p_input->input_alloc.i_bytes_per_sec,
119 (int)(p_input->input.i_bytes_per_frame
120 * p_input->input.i_rate
121 / p_input->input.i_frame_length) );
122 /* Allocate in the heap, it is more convenient for the decoder. */
123 p_input->input_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
125 p_input->b_error = 0;
130 /*****************************************************************************
131 * aout_InputDelete : delete an input
132 *****************************************************************************
133 * This function must be entered with the mixer lock.
134 *****************************************************************************/
135 int aout_InputDelete( aout_instance_t * p_aout, aout_input_t * p_input )
137 if ( p_input->b_error ) return 0;
139 aout_FiltersDestroyPipeline( p_aout, p_input->pp_filters,
140 p_input->i_nb_filters );
141 aout_FiltersDestroyPipeline( p_aout, p_input->pp_resamplers,
142 p_input->i_nb_resamplers );
143 aout_FifoDestroy( p_aout, &p_input->fifo );
148 /*****************************************************************************
149 * aout_InputPlay : play a buffer
150 *****************************************************************************
151 * This function must be entered with the input lock.
152 *****************************************************************************/
153 int aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
154 aout_buffer_t * p_buffer )
158 /* We don't care if someone changes the start date behind our back after
159 * this. We'll deal with that when pushing the buffer, and compensate
160 * with the next incoming buffer. */
161 vlc_mutex_lock( &p_aout->input_fifos_lock );
162 start_date = aout_FifoNextStart( p_aout, &p_input->fifo );
163 vlc_mutex_unlock( &p_aout->input_fifos_lock );
165 if ( start_date != 0 && start_date < mdate() )
167 /* The decoder is _very_ late. This can only happen if the user
168 * pauses the stream (or if the decoder is buggy, which cannot
170 msg_Warn( p_aout, "computed PTS is out of range ("I64Fd"), "
171 "clearing out", mdate() - start_date );
172 vlc_mutex_lock( &p_aout->input_fifos_lock );
173 aout_FifoSet( p_aout, &p_input->fifo, 0 );
174 vlc_mutex_unlock( &p_aout->input_fifos_lock );
175 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
176 msg_Warn( p_aout, "timing screwed, stopping resampling" );
177 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
178 if ( p_input->i_nb_resamplers != 0 )
180 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
181 p_input->pp_resamplers[0]->b_reinit = VLC_TRUE;
186 if ( p_buffer->start_date < mdate() + AOUT_MIN_PREPARE_TIME )
188 /* The decoder gives us f*cked up PTS. It's its business, but we
189 * can't present it anyway, so drop the buffer. */
190 msg_Warn( p_aout, "PTS is out of range ("I64Fd"), dropping buffer",
191 mdate() - p_buffer->start_date );
192 aout_BufferFree( p_buffer );
197 if ( start_date == 0 ) start_date = p_buffer->start_date;
199 /* Run pre-filters. */
200 aout_FiltersPlay( p_aout, p_input->pp_filters, p_input->i_nb_filters,
203 /* Run the resampler if needed.
204 * We first need to calculate the output rate of this resampler. */
205 if ( ( p_input->i_resampling_type == AOUT_RESAMPLING_NONE ) &&
206 ( start_date < p_buffer->start_date - AOUT_PTS_TOLERANCE
207 || start_date > p_buffer->start_date + AOUT_PTS_TOLERANCE ) &&
208 p_input->i_nb_resamplers > 0 )
210 /* Can happen in several circumstances :
211 * 1. A problem at the input (clock drift)
212 * 2. A small pause triggered by the user
213 * 3. Some delay in the output stage, causing a loss of lip
215 * Solution : resample the buffer to avoid a scratch.
217 mtime_t drift = p_buffer->start_date - start_date;
219 p_input->i_resamp_start_date = mdate();
220 p_input->i_resamp_start_drift = (int)drift;
223 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
225 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
227 msg_Warn( p_aout, "buffer is "I64Fd" %s, triggering %ssampling",
228 drift > 0 ? drift : -drift,
229 drift > 0 ? "in advance" : "late",
230 drift > 0 ? "down" : "up");
233 if ( p_input->i_resampling_type != AOUT_RESAMPLING_NONE )
235 /* Resampling has been triggered previously (because of dates
236 * mismatch). We want the resampling to happen progressively so
237 * it isn't too audible to the listener. */
239 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
241 p_input->pp_resamplers[0]->input.i_rate += 10; /* Hz */
245 p_input->pp_resamplers[0]->input.i_rate -= 10; /* Hz */
248 /* Check if everything is back to normal, in which case we can stop the
250 if( p_input->pp_resamplers[0]->input.i_rate ==
251 p_input->input.i_rate )
253 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
254 msg_Warn( p_aout, "resampling stopped after "I64Fi" usec",
255 mdate() - p_input->i_resamp_start_date );
257 else if( abs( (int)(p_buffer->start_date - start_date) ) <
258 abs( p_input->i_resamp_start_drift ) / 2 )
260 /* if we reduced the drift from half, then it is time to switch
261 * back the resampling direction. */
262 if( p_input->i_resampling_type == AOUT_RESAMPLING_UP )
263 p_input->i_resampling_type = AOUT_RESAMPLING_DOWN;
265 p_input->i_resampling_type = AOUT_RESAMPLING_UP;
266 p_input->i_resamp_start_drift = 0;
268 else if( p_input->i_resamp_start_drift &&
269 ( abs( (int)(p_buffer->start_date - start_date) ) >
270 abs( p_input->i_resamp_start_drift ) * 3 / 2 ) )
272 /* If the drift is increasing and not decreasing, than something
273 * is bad. We'd better stop the resampling right now. */
274 msg_Warn( p_aout, "timing screwed, stopping resampling" );
275 p_input->i_resampling_type = AOUT_RESAMPLING_NONE;
276 p_input->pp_resamplers[0]->input.i_rate = p_input->input.i_rate;
281 /* Adding the start date will be managed by aout_FifoPush(). */
282 p_buffer->start_date = start_date;
283 p_buffer->end_date = start_date +
284 (p_buffer->end_date - p_buffer->start_date);
286 /* Actually run the resampler now. */
287 if ( p_input->i_nb_resamplers > 0 && p_aout->mixer.mixer.i_rate !=
288 p_input->pp_resamplers[0]->input.i_rate )
290 aout_FiltersPlay( p_aout, p_input->pp_resamplers,
291 p_input->i_nb_resamplers,
295 vlc_mutex_lock( &p_aout->input_fifos_lock );
296 aout_FifoPush( p_aout, &p_input->fifo, p_buffer );
297 vlc_mutex_unlock( &p_aout->input_fifos_lock );