1 /*****************************************************************************
2 * dec.c : audio output API towards decoders
3 *****************************************************************************
4 * Copyright (C) 2002-2007 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 *****************************************************************************/
33 #include <vlc_common.h>
40 #include <vlc_input.h>
42 #include "aout_internal.h"
44 /*****************************************************************************
45 * aout_DecNew : create a decoder
46 *****************************************************************************/
47 static aout_input_t * DecNew( aout_instance_t * p_aout,
48 audio_sample_format_t *p_format,
49 const audio_replay_gain_t *p_replay_gain,
50 const aout_request_vout_t *p_request_vout )
52 aout_input_t * p_input;
54 /* Sanitize audio format */
55 if( p_format->i_channels > 32 )
57 msg_Err( p_aout, "too many audio channels (%u)",
58 p_format->i_channels );
61 if( p_format->i_channels <= 0 )
63 msg_Err( p_aout, "no audio channels" );
66 if( p_format->i_channels != aout_FormatNbChannels( p_format ) )
68 msg_Err( p_aout, "incompatible audio channels count with layout mask" );
72 if( p_format->i_rate > 192000 )
74 msg_Err( p_aout, "excessive audio sample frequency (%u)",
78 if( p_format->i_rate < 4000 )
80 msg_Err( p_aout, "too low audio sample frequency (%u)",
85 /* We can only be called by the decoder, so no need to lock
87 aout_lock_mixer( p_aout );
89 if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
91 msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
95 p_input = calloc( 1, sizeof(aout_input_t));
99 vlc_mutex_init( &p_input->lock );
101 p_input->b_changed = false;
102 p_input->b_error = true;
103 p_input->b_paused = false;
104 p_input->i_pause_date = 0;
106 aout_FormatPrepare( p_format );
108 memcpy( &p_input->input, p_format,
109 sizeof(audio_sample_format_t) );
111 p_input->replay_gain = *p_replay_gain;
113 aout_lock_input_fifos( p_aout );
114 p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
115 p_aout->i_nb_inputs++;
117 if ( !p_aout->p_mixer )
121 var_Destroy( p_aout, "audio-device" );
122 var_Destroy( p_aout, "audio-channels" );
124 /* Recreate the output using the new format. */
125 if ( aout_OutputNew( p_aout, p_format ) < 0 )
127 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
129 aout_lock_input( p_aout, p_aout->pp_inputs[i] );
130 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
131 aout_unlock_input( p_aout, p_aout->pp_inputs[i] );
133 aout_unlock_input_fifos( p_aout );
134 aout_unlock_mixer( p_aout );
138 /* Create other input streams. */
139 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
141 aout_input_t *p_input = p_aout->pp_inputs[i];
143 aout_lock_input( p_aout, p_input );
144 aout_InputDelete( p_aout, p_input );
145 aout_InputNew( p_aout, p_input, &p_input->request_vout );
146 aout_unlock_input( p_aout, p_input );
151 aout_MixerDelete( p_aout );
154 if ( aout_MixerNew( p_aout ) == -1 )
156 aout_OutputDelete( p_aout );
157 aout_unlock_input_fifos( p_aout );
161 aout_InputNew( p_aout, p_input, p_request_vout );
162 aout_unlock_input_fifos( p_aout );
164 aout_unlock_mixer( p_aout );
169 aout_unlock_mixer( p_aout );
173 aout_input_t * __aout_DecNew( vlc_object_t * p_this,
174 aout_instance_t ** pp_aout,
175 audio_sample_format_t * p_format,
176 const audio_replay_gain_t *p_replay_gain,
177 const aout_request_vout_t *p_request_video )
179 aout_instance_t *p_aout = *pp_aout;
180 if ( p_aout == NULL )
182 msg_Dbg( p_this, "no aout present, spawning one" );
183 p_aout = aout_New( p_this );
185 /* Everything failed, I'm a loser, I just wanna die */
189 vlc_object_attach( p_aout, p_this );
193 return DecNew( p_aout, p_format, p_replay_gain, p_request_video );
196 /*****************************************************************************
197 * aout_DecDelete : delete a decoder
198 *****************************************************************************/
199 int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
203 /* This function can only be called by the decoder itself, so no need
204 * to lock p_input->lock. */
205 aout_lock_mixer( p_aout );
207 for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
209 if ( p_aout->pp_inputs[i_input] == p_input )
215 if ( i_input == p_aout->i_nb_inputs )
217 msg_Err( p_aout, "cannot find an input to delete" );
218 aout_unlock_mixer( p_aout );
222 /* Remove the input from the list. */
223 memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
224 (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
225 p_aout->i_nb_inputs--;
227 aout_InputDelete( p_aout, p_input );
229 vlc_mutex_destroy( &p_input->lock );
232 if ( !p_aout->i_nb_inputs )
234 aout_OutputDelete( p_aout );
235 aout_MixerDelete( p_aout );
236 var_Destroy( p_aout, "audio-device" );
237 var_Destroy( p_aout, "audio-channels" );
240 aout_unlock_mixer( p_aout );
250 /*****************************************************************************
251 * aout_DecNewBuffer : ask for a new empty buffer
252 *****************************************************************************/
253 aout_buffer_t * aout_DecNewBuffer( aout_input_t * p_input,
254 size_t i_nb_samples )
256 aout_buffer_t * p_buffer;
259 aout_lock_input( NULL, p_input );
261 if ( p_input->b_error )
263 aout_unlock_input( NULL, p_input );
267 duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
269 /* This necessarily allocates in the heap. */
270 p_buffer = aout_BufferAlloc( &p_input->input_alloc, duration, NULL );
271 if( p_buffer != NULL )
272 p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
273 / p_input->input.i_frame_length;
275 /* Suppose the decoder doesn't have more than one buffered buffer */
276 p_input->b_changed = false;
278 aout_unlock_input( NULL, p_input );
280 if( p_buffer == NULL )
283 p_buffer->i_nb_samples = i_nb_samples;
284 p_buffer->start_date = p_buffer->end_date = 0;
288 /*****************************************************************************
289 * aout_DecDeleteBuffer : destroy an undecoded buffer
290 *****************************************************************************/
291 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
292 aout_buffer_t * p_buffer )
294 (void)p_aout; (void)p_input;
295 aout_BufferFree( p_buffer );
298 /*****************************************************************************
299 * aout_DecPlay : filter & mix the decoded buffer
300 *****************************************************************************/
301 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
302 aout_buffer_t * p_buffer, int i_input_rate )
304 assert( i_input_rate >= INPUT_RATE_DEFAULT / AOUT_MAX_INPUT_RATE &&
305 i_input_rate <= INPUT_RATE_DEFAULT * AOUT_MAX_INPUT_RATE );
307 assert( p_buffer->start_date > 0 );
309 p_buffer->end_date = p_buffer->start_date
310 + (mtime_t)p_buffer->i_nb_samples * 1000000
311 / p_input->input.i_rate;
313 aout_lock_input( p_aout, p_input );
315 if( p_input->b_error )
317 aout_unlock_input( p_aout, p_input );
318 aout_BufferFree( p_buffer );
322 if( p_input->b_changed )
324 /* Maybe the allocation size has changed. Re-allocate a buffer. */
325 aout_buffer_t * p_new_buffer;
326 mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
327 / p_input->input.i_rate;
329 p_new_buffer = aout_BufferAlloc( &p_input->input_alloc, duration, NULL);
330 vlc_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
331 p_buffer->i_nb_bytes );
332 p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
333 p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
334 p_new_buffer->start_date = p_buffer->start_date;
335 p_new_buffer->end_date = p_buffer->end_date;
336 aout_BufferFree( p_buffer );
337 p_buffer = p_new_buffer;
338 p_input->b_changed = false;
341 int i_ret = aout_InputPlay( p_aout, p_input, p_buffer, i_input_rate );
343 aout_unlock_input( p_aout, p_input );
348 /* Run the mixer if it is able to run. */
349 aout_lock_mixer( p_aout );
351 aout_MixerRun( p_aout );
353 aout_unlock_mixer( p_aout );
358 int aout_DecGetResetLost( aout_instance_t *p_aout, aout_input_t *p_input )
360 aout_lock_input( p_aout, p_input );
361 int i_value = p_input->i_buffer_lost;
362 p_input->i_buffer_lost = 0;
363 aout_unlock_input( p_aout, p_input );
368 void aout_DecChangePause( aout_instance_t *p_aout, aout_input_t *p_input, bool b_paused, mtime_t i_date )
370 mtime_t i_duration = 0;
371 aout_lock_input( p_aout, p_input );
372 assert( !p_input->b_paused || !b_paused );
373 if( p_input->b_paused )
375 i_duration = i_date - p_input->i_pause_date;
377 p_input->b_paused = b_paused;
378 p_input->i_pause_date = i_date;
379 aout_unlock_input( p_aout, p_input );
381 if( i_duration != 0 )
383 aout_lock_mixer( p_aout );
384 for( aout_buffer_t *p = p_input->mixer.fifo.p_first; p != NULL; p = p->p_next )
386 p->start_date += i_duration;
387 p->end_date += i_duration;
389 aout_unlock_mixer( p_aout );
393 void aout_DecFlush( aout_instance_t *p_aout, aout_input_t *p_input )
395 aout_lock_input_fifos( p_aout );
397 aout_FifoSet( p_aout, &p_input->mixer.fifo, 0 );
398 p_input->mixer.begin = NULL;
400 aout_unlock_input_fifos( p_aout );