1 /*****************************************************************************
2 * dec.c : audio output API towards decoders
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: dec.c,v 1.8 2003/02/26 18:15:33 massiot 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"
43 /*****************************************************************************
44 * aout_DecNew : create a decoder
45 *****************************************************************************/
46 static aout_input_t * DecNew( aout_instance_t * p_aout,
47 audio_sample_format_t * p_format )
49 aout_input_t * p_input;
51 /* We can only be called by the decoder, so no need to lock
53 vlc_mutex_lock( &p_aout->mixer_lock );
55 if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
57 msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
61 p_input = malloc(sizeof(aout_input_t));
62 if ( p_input == NULL )
64 msg_Err( p_aout, "out of memory" );
68 vlc_mutex_init( p_aout, &p_input->lock );
70 p_input->b_changed = 0;
72 aout_FormatPrepare( p_format );
73 memcpy( &p_input->input, p_format,
74 sizeof(audio_sample_format_t) );
76 p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
77 p_aout->i_nb_inputs++;
79 if ( p_aout->mixer.b_error )
83 if ( var_Type( p_aout, "audio-device" ) != 0 )
85 var_Destroy( p_aout, "audio-device" );
87 if ( var_Type( p_aout, "audio-channels" ) != 0 )
89 var_Destroy( p_aout, "audio-channels" );
92 /* Recreate the output using the new format. */
93 if ( aout_OutputNew( p_aout, p_format ) < 0 )
95 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
97 vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
98 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
99 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
101 vlc_mutex_unlock( &p_aout->mixer_lock );
105 /* Create other input streams. */
106 for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
108 vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
109 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
110 aout_InputNew( p_aout, p_aout->pp_inputs[i] );
111 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
116 aout_MixerDelete( p_aout );
119 if ( aout_MixerNew( p_aout ) == -1 )
121 aout_OutputDelete( p_aout );
122 vlc_mutex_unlock( &p_aout->mixer_lock );
126 aout_MixerNew( p_aout );
128 aout_InputNew( p_aout, p_input );
130 vlc_mutex_unlock( &p_aout->mixer_lock );
135 aout_input_t * __aout_DecNew( vlc_object_t * p_this,
136 aout_instance_t ** pp_aout,
137 audio_sample_format_t * p_format )
139 if ( *pp_aout == NULL )
141 /* Create an audio output if there is none. */
142 *pp_aout = vlc_object_find( p_this, VLC_OBJECT_AOUT, FIND_ANYWHERE );
144 if( *pp_aout == NULL )
146 msg_Dbg( p_this, "no aout present, spawning one" );
148 *pp_aout = aout_New( p_this );
149 /* Everything failed, I'm a loser, I just wanna die */
150 if( *pp_aout == NULL )
157 vlc_object_release( *pp_aout );
161 return DecNew( *pp_aout, p_format );
164 /*****************************************************************************
165 * aout_DecDelete : delete a decoder
166 *****************************************************************************/
167 int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
171 /* This function can only be called by the decoder itself, so no need
172 * to lock p_input->lock. */
173 vlc_mutex_lock( &p_aout->mixer_lock );
175 for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
177 if ( p_aout->pp_inputs[i_input] == p_input )
183 if ( i_input == p_aout->i_nb_inputs )
185 msg_Err( p_aout, "cannot find an input to delete" );
189 /* Remove the input from the list. */
190 memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
191 (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
192 p_aout->i_nb_inputs--;
194 aout_InputDelete( p_aout, p_input );
196 vlc_mutex_destroy( &p_input->lock );
199 if ( !p_aout->i_nb_inputs )
201 aout_OutputDelete( p_aout );
202 aout_MixerDelete( p_aout );
203 if ( var_Type( p_aout, "audio-device" ) != 0 )
205 var_Destroy( p_aout, "audio-device" );
207 if ( var_Type( p_aout, "audio-channels" ) != 0 )
209 var_Destroy( p_aout, "audio-channels" );
213 vlc_mutex_unlock( &p_aout->mixer_lock );
223 /*****************************************************************************
224 * aout_DecNewBuffer : ask for a new empty buffer
225 *****************************************************************************/
226 aout_buffer_t * aout_DecNewBuffer( aout_instance_t * p_aout,
227 aout_input_t * p_input,
228 size_t i_nb_samples )
230 aout_buffer_t * p_buffer;
233 vlc_mutex_lock( &p_input->lock );
235 if ( p_input->b_error )
237 vlc_mutex_unlock( &p_input->lock );
241 duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
243 /* This necessarily allocates in the heap. */
244 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
245 p_buffer->i_nb_samples = i_nb_samples;
246 p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
247 / p_input->input.i_frame_length;
249 /* Suppose the decoder doesn't have more than one buffered buffer */
250 p_input->b_changed = 0;
252 vlc_mutex_unlock( &p_input->lock );
254 if ( p_buffer == NULL )
256 msg_Err( p_aout, "NULL buffer !" );
260 p_buffer->start_date = p_buffer->end_date = 0;
266 /*****************************************************************************
267 * aout_DecDeleteBuffer : destroy an undecoded buffer
268 *****************************************************************************/
269 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
270 aout_buffer_t * p_buffer )
272 aout_BufferFree( p_buffer );
275 /*****************************************************************************
276 * aout_DecPlay : filter & mix the decoded buffer
277 *****************************************************************************/
278 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
279 aout_buffer_t * p_buffer )
281 if ( p_buffer->start_date == 0 )
283 msg_Warn( p_aout, "non-dated buffer received" );
284 aout_BufferFree( p_buffer );
288 if ( p_buffer->start_date > mdate() + AOUT_MAX_ADVANCE_TIME )
290 msg_Warn( p_aout, "received buffer in the future ("I64Fd")",
291 p_buffer->start_date - mdate());
292 aout_BufferFree( p_buffer );
296 p_buffer->end_date = p_buffer->start_date
297 + (mtime_t)(p_buffer->i_nb_samples * 1000000)
298 / p_input->input.i_rate;
300 vlc_mutex_lock( &p_input->lock );
302 if ( p_input->b_error )
304 vlc_mutex_unlock( &p_input->lock );
305 aout_BufferFree( p_buffer );
309 if ( p_input->b_changed )
311 /* Maybe the allocation size has changed. Re-allocate a buffer. */
312 aout_buffer_t * p_new_buffer;
313 mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
314 / p_input->input.i_rate;
316 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
317 p_aout->p_vlc->pf_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
318 p_buffer->i_nb_bytes );
319 p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
320 p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
321 p_new_buffer->start_date = p_buffer->start_date;
322 p_new_buffer->end_date = p_buffer->end_date;
323 aout_BufferFree( p_buffer );
324 p_buffer = p_new_buffer;
325 p_input->b_changed = 0;
328 /* If the buffer is too early, wait a while. */
329 mwait( p_buffer->start_date - AOUT_MAX_PREPARE_TIME );
331 if ( aout_InputPlay( p_aout, p_input, p_buffer ) == -1 )
333 vlc_mutex_unlock( &p_input->lock );
337 vlc_mutex_unlock( &p_input->lock );
339 /* Run the mixer if it is able to run. */
340 vlc_mutex_lock( &p_aout->mixer_lock );
341 aout_MixerRun( p_aout );
342 vlc_mutex_unlock( &p_aout->mixer_lock );