1 /*****************************************************************************
2 * dec.c : audio output API towards decoders
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: dec.c,v 1.10 2003/05/22 16:01:02 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"
38 #include <vlc/input.h> /* for input_thread_t and i_pts_delay */
44 /*****************************************************************************
45 * aout_DecNew : create a decoder
46 *****************************************************************************/
47 static aout_input_t * DecNew( vlc_object_t * p_this, aout_instance_t * p_aout,
48 audio_sample_format_t * p_format )
50 aout_input_t * p_input;
51 input_thread_t * p_input_thread;
53 /* We can only be called by the decoder, so no need to lock
55 vlc_mutex_lock( &p_aout->mixer_lock );
57 if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
59 msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
63 p_input = malloc(sizeof(aout_input_t));
64 if ( p_input == NULL )
66 msg_Err( p_aout, "out of memory" );
70 vlc_mutex_init( p_aout, &p_input->lock );
72 p_input->b_changed = 0;
74 aout_FormatPrepare( p_format );
75 memcpy( &p_input->input, p_format,
76 sizeof(audio_sample_format_t) );
78 p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
79 p_aout->i_nb_inputs++;
81 if ( p_aout->mixer.b_error )
85 if ( var_Type( p_aout, "audio-device" ) != 0 )
87 var_Destroy( p_aout, "audio-device" );
89 if ( var_Type( p_aout, "audio-channels" ) != 0 )
91 var_Destroy( p_aout, "audio-channels" );
94 /* Recreate the output using the new format. */
95 if ( aout_OutputNew( p_aout, p_format ) < 0 )
97 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
99 vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
100 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
101 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
103 vlc_mutex_unlock( &p_aout->mixer_lock );
107 /* Create other input streams. */
108 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
110 vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
111 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
112 aout_InputNew( p_aout, p_aout->pp_inputs[i] );
113 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
118 aout_MixerDelete( p_aout );
121 if ( aout_MixerNew( p_aout ) == -1 )
123 aout_OutputDelete( p_aout );
124 vlc_mutex_unlock( &p_aout->mixer_lock );
128 aout_MixerNew( p_aout );
130 aout_InputNew( p_aout, p_input );
132 vlc_mutex_unlock( &p_aout->mixer_lock );
134 p_input_thread = (input_thread_t *)vlc_object_find( p_this,
135 VLC_OBJECT_INPUT, FIND_PARENT );
138 p_aout->i_pts_delay = p_input_thread->i_pts_delay;
139 p_aout->i_pts_delay += p_aout->p_vlc->i_desync;
140 vlc_object_release( p_input_thread );
144 p_aout->i_pts_delay = DEFAULT_PTS_DELAY;
145 p_aout->i_pts_delay += p_aout->p_vlc->i_desync;
151 aout_input_t * __aout_DecNew( vlc_object_t * p_this,
152 aout_instance_t ** pp_aout,
153 audio_sample_format_t * p_format )
155 if ( *pp_aout == NULL )
157 /* Create an audio output if there is none. */
158 *pp_aout = vlc_object_find( p_this, VLC_OBJECT_AOUT, FIND_ANYWHERE );
160 if( *pp_aout == NULL )
162 msg_Dbg( p_this, "no aout present, spawning one" );
164 *pp_aout = aout_New( p_this );
165 /* Everything failed, I'm a loser, I just wanna die */
166 if( *pp_aout == NULL )
173 vlc_object_release( *pp_aout );
177 return DecNew( p_this, *pp_aout, p_format );
180 /*****************************************************************************
181 * aout_DecDelete : delete a decoder
182 *****************************************************************************/
183 int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
187 /* This function can only be called by the decoder itself, so no need
188 * to lock p_input->lock. */
189 vlc_mutex_lock( &p_aout->mixer_lock );
191 for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
193 if ( p_aout->pp_inputs[i_input] == p_input )
199 if ( i_input == p_aout->i_nb_inputs )
201 msg_Err( p_aout, "cannot find an input to delete" );
205 /* Remove the input from the list. */
206 memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
207 (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
208 p_aout->i_nb_inputs--;
210 aout_InputDelete( p_aout, p_input );
212 vlc_mutex_destroy( &p_input->lock );
215 if ( !p_aout->i_nb_inputs )
217 aout_OutputDelete( p_aout );
218 aout_MixerDelete( p_aout );
219 if ( var_Type( p_aout, "audio-device" ) != 0 )
221 var_Destroy( p_aout, "audio-device" );
223 if ( var_Type( p_aout, "audio-channels" ) != 0 )
225 var_Destroy( p_aout, "audio-channels" );
229 vlc_mutex_unlock( &p_aout->mixer_lock );
239 /*****************************************************************************
240 * aout_DecNewBuffer : ask for a new empty buffer
241 *****************************************************************************/
242 aout_buffer_t * aout_DecNewBuffer( aout_instance_t * p_aout,
243 aout_input_t * p_input,
244 size_t i_nb_samples )
246 aout_buffer_t * p_buffer;
249 vlc_mutex_lock( &p_input->lock );
251 if ( p_input->b_error )
253 vlc_mutex_unlock( &p_input->lock );
257 duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
259 /* This necessarily allocates in the heap. */
260 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
261 p_buffer->i_nb_samples = i_nb_samples;
262 p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
263 / p_input->input.i_frame_length;
265 /* Suppose the decoder doesn't have more than one buffered buffer */
266 p_input->b_changed = 0;
268 vlc_mutex_unlock( &p_input->lock );
270 if ( p_buffer == NULL )
272 msg_Err( p_aout, "NULL buffer !" );
276 p_buffer->start_date = p_buffer->end_date = 0;
282 /*****************************************************************************
283 * aout_DecDeleteBuffer : destroy an undecoded buffer
284 *****************************************************************************/
285 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
286 aout_buffer_t * p_buffer )
288 aout_BufferFree( p_buffer );
291 /*****************************************************************************
292 * aout_DecPlay : filter & mix the decoded buffer
293 *****************************************************************************/
294 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
295 aout_buffer_t * p_buffer )
297 if ( p_buffer->start_date == 0 )
299 msg_Warn( p_aout, "non-dated buffer received" );
300 aout_BufferFree( p_buffer );
304 /* Apply the desynchronisation requested by the user */
305 p_buffer->start_date += p_aout->p_vlc->i_desync;
306 p_buffer->end_date += p_aout->p_vlc->i_desync;
308 if ( p_buffer->start_date > mdate() + p_aout->i_pts_delay +
309 AOUT_MAX_ADVANCE_TIME )
311 msg_Warn( p_aout, "received buffer in the future ("I64Fd")",
312 p_buffer->start_date - mdate());
313 aout_BufferFree( p_buffer );
317 p_buffer->end_date = p_buffer->start_date
318 + (mtime_t)(p_buffer->i_nb_samples * 1000000)
319 / p_input->input.i_rate;
321 vlc_mutex_lock( &p_input->lock );
323 if ( p_input->b_error )
325 vlc_mutex_unlock( &p_input->lock );
326 aout_BufferFree( p_buffer );
330 if ( p_input->b_changed )
332 /* Maybe the allocation size has changed. Re-allocate a buffer. */
333 aout_buffer_t * p_new_buffer;
334 mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
335 / p_input->input.i_rate;
337 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
338 p_aout->p_vlc->pf_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
339 p_buffer->i_nb_bytes );
340 p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
341 p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
342 p_new_buffer->start_date = p_buffer->start_date;
343 p_new_buffer->end_date = p_buffer->end_date;
344 aout_BufferFree( p_buffer );
345 p_buffer = p_new_buffer;
346 p_input->b_changed = 0;
349 /* If the buffer is too early, wait a while. */
350 mwait( p_buffer->start_date - AOUT_MAX_PREPARE_TIME );
352 if ( aout_InputPlay( p_aout, p_input, p_buffer ) == -1 )
354 vlc_mutex_unlock( &p_input->lock );
358 vlc_mutex_unlock( &p_input->lock );
360 /* Run the mixer if it is able to run. */
361 vlc_mutex_lock( &p_aout->mixer_lock );
362 aout_MixerRun( p_aout );
363 vlc_mutex_unlock( &p_aout->mixer_lock );