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 *****************************************************************************/
31 #include <vlc_common.h>
38 #include <vlc_input.h>
40 #include "aout_internal.h"
42 /*****************************************************************************
43 * aout_DecNew : create a decoder
44 *****************************************************************************/
45 static aout_input_t * DecNew( vlc_object_t * p_this, aout_instance_t * p_aout,
46 audio_sample_format_t *p_format,
47 audio_replay_gain_t *p_replay_gain )
49 aout_input_t * p_input;
51 /* Sanitize audio format */
52 if( p_format->i_channels > 32 )
54 msg_Err( p_aout, "too many audio channels (%u)",
55 p_format->i_channels );
58 if( p_format->i_channels <= 0 )
60 msg_Err( p_aout, "no audio channels" );
64 if( p_format->i_rate > 192000 )
66 msg_Err( p_aout, "excessive audio sample frequency (%u)",
70 if( p_format->i_rate < 4000 )
72 msg_Err( p_aout, "too low audio sample frequency (%u)",
77 /* We can only be called by the decoder, so no need to lock
79 aout_lock_mixer( p_aout );
81 if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
83 msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
87 p_input = malloc(sizeof(aout_input_t));
90 memset( p_input, 0, sizeof(aout_input_t) );
92 vlc_mutex_init( &p_input->lock );
94 p_input->b_changed = false;
95 p_input->b_error = true;
96 p_input->b_paused = false;
97 p_input->i_pause_date = 0;
99 aout_FormatPrepare( p_format );
101 memcpy( &p_input->input, p_format,
102 sizeof(audio_sample_format_t) );
104 p_input->replay_gain = *p_replay_gain;
106 aout_lock_input_fifos( p_aout );
107 p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
108 p_aout->i_nb_inputs++;
110 if ( p_aout->mixer.b_error )
114 var_Destroy( p_aout, "audio-device" );
115 var_Destroy( p_aout, "audio-channels" );
117 /* Recreate the output using the new format. */
118 if ( aout_OutputNew( p_aout, p_format ) < 0 )
120 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
122 aout_lock_input( p_aout, p_aout->pp_inputs[i] );
123 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
124 aout_unlock_input( p_aout, p_aout->pp_inputs[i] );
126 aout_unlock_input_fifos( p_aout );
127 aout_unlock_mixer( p_aout );
131 /* Create other input streams. */
132 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
134 aout_lock_input( p_aout, p_aout->pp_inputs[i] );
135 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
136 aout_InputNew( p_aout, p_aout->pp_inputs[i] );
137 aout_unlock_input( p_aout, p_aout->pp_inputs[i] );
142 aout_MixerDelete( p_aout );
145 if ( aout_MixerNew( p_aout ) == -1 )
147 aout_OutputDelete( p_aout );
148 aout_unlock_input_fifos( p_aout );
152 aout_InputNew( p_aout, p_input );
153 aout_unlock_input_fifos( p_aout );
155 aout_unlock_mixer( p_aout );
160 aout_unlock_mixer( p_aout );
164 aout_input_t * __aout_DecNew( vlc_object_t * p_this,
165 aout_instance_t ** pp_aout,
166 audio_sample_format_t * p_format,
167 audio_replay_gain_t *p_replay_gain )
169 aout_instance_t *p_aout = *pp_aout;
170 if ( p_aout == NULL )
172 msg_Dbg( p_this, "no aout present, spawning one" );
173 p_aout = aout_New( p_this );
175 /* Everything failed, I'm a loser, I just wanna die */
179 vlc_object_attach( p_aout, p_this );
183 return DecNew( p_this, p_aout, p_format, p_replay_gain );
186 /*****************************************************************************
187 * aout_DecDelete : delete a decoder
188 *****************************************************************************/
189 int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
193 /* This function can only be called by the decoder itself, so no need
194 * to lock p_input->lock. */
195 aout_lock_mixer( p_aout );
197 for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
199 if ( p_aout->pp_inputs[i_input] == p_input )
205 if ( i_input == p_aout->i_nb_inputs )
207 msg_Err( p_aout, "cannot find an input to delete" );
208 aout_unlock_mixer( p_aout );
212 /* Remove the input from the list. */
213 memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
214 (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
215 p_aout->i_nb_inputs--;
217 aout_InputDelete( p_aout, p_input );
219 vlc_mutex_destroy( &p_input->lock );
222 if ( !p_aout->i_nb_inputs )
224 aout_OutputDelete( p_aout );
225 aout_MixerDelete( p_aout );
226 if ( var_Type( p_aout, "audio-device" ) != 0 )
228 var_Destroy( p_aout, "audio-device" );
230 if ( var_Type( p_aout, "audio-channels" ) != 0 )
232 var_Destroy( p_aout, "audio-channels" );
236 aout_unlock_mixer( p_aout );
246 /*****************************************************************************
247 * aout_DecNewBuffer : ask for a new empty buffer
248 *****************************************************************************/
249 aout_buffer_t * aout_DecNewBuffer( aout_input_t * p_input,
250 size_t i_nb_samples )
252 aout_buffer_t * p_buffer;
255 aout_lock_input( NULL, p_input );
257 if ( p_input->b_error )
259 aout_unlock_input( NULL, p_input );
263 duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
265 /* This necessarily allocates in the heap. */
266 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
267 if( p_buffer != NULL )
268 p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
269 / p_input->input.i_frame_length;
271 /* Suppose the decoder doesn't have more than one buffered buffer */
272 p_input->b_changed = false;
274 aout_unlock_input( NULL, p_input );
276 if( p_buffer == NULL )
279 p_buffer->i_nb_samples = i_nb_samples;
280 p_buffer->start_date = p_buffer->end_date = 0;
284 /*****************************************************************************
285 * aout_DecDeleteBuffer : destroy an undecoded buffer
286 *****************************************************************************/
287 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
288 aout_buffer_t * p_buffer )
290 (void)p_aout; (void)p_input;
291 aout_BufferFree( p_buffer );
294 /*****************************************************************************
295 * aout_DecPlay : filter & mix the decoded buffer
296 *****************************************************************************/
297 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
298 aout_buffer_t * p_buffer, int i_input_rate )
300 assert( i_input_rate >= INPUT_RATE_DEFAULT / AOUT_MAX_INPUT_RATE &&
301 i_input_rate <= INPUT_RATE_DEFAULT * AOUT_MAX_INPUT_RATE );
303 assert( p_buffer->start_date > 0 );
305 p_buffer->end_date = p_buffer->start_date
306 + (mtime_t)p_buffer->i_nb_samples * 1000000
307 / p_input->input.i_rate;
309 aout_lock_input( p_aout, p_input );
311 if( p_input->b_error )
313 aout_unlock_input( p_aout, p_input );
314 aout_BufferFree( p_buffer );
318 if( p_input->b_changed )
320 /* Maybe the allocation size has changed. Re-allocate a buffer. */
321 aout_buffer_t * p_new_buffer;
322 mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
323 / p_input->input.i_rate;
325 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
326 vlc_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
327 p_buffer->i_nb_bytes );
328 p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
329 p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
330 p_new_buffer->start_date = p_buffer->start_date;
331 p_new_buffer->end_date = p_buffer->end_date;
332 aout_BufferFree( p_buffer );
333 p_buffer = p_new_buffer;
334 p_input->b_changed = false;
337 int i_ret = aout_InputPlay( p_aout, p_input, p_buffer, i_input_rate );
339 aout_unlock_input( p_aout, p_input );
344 /* Run the mixer if it is able to run. */
345 aout_lock_mixer( p_aout );
347 aout_MixerRun( p_aout );
349 aout_unlock_mixer( p_aout );
354 int aout_DecGetResetLost( aout_instance_t *p_aout, aout_input_t *p_input )
356 aout_lock_input( p_aout, p_input );
357 int i_value = p_input->i_buffer_lost;
358 p_input->i_buffer_lost = 0;
359 aout_unlock_input( p_aout, p_input );
364 void aout_DecChangePause( aout_instance_t *p_aout, aout_input_t *p_input, bool b_paused, mtime_t i_date )
366 mtime_t i_duration = 0;
367 aout_lock_input( p_aout, p_input );
368 assert( !p_input->b_paused || !b_paused );
369 if( p_input->b_paused )
371 i_duration = i_date - p_input->i_pause_date;
373 p_input->b_paused = b_paused;
374 p_input->i_pause_date = i_date;
375 aout_unlock_input( p_aout, p_input );
377 if( i_duration != 0 )
379 aout_lock_mixer( p_aout );
380 for( aout_buffer_t *p = p_input->fifo.p_first; p != NULL; p = p->p_next )
382 p->start_date += i_duration;
383 p->end_date += i_duration;
385 aout_unlock_mixer( p_aout );
389 void aout_DecFlush( aout_instance_t *p_aout, aout_input_t *p_input )
391 aout_lock_input_fifos( p_aout );
393 aout_FifoSet( p_aout, &p_input->fifo, 0 );
394 p_input->p_first_byte_to_mix = NULL;
396 aout_unlock_input_fifos( p_aout );