1 /*****************************************************************************
2 * dec.c : audio output API towards decoders
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: dec.c,v 1.3 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"
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 memcpy( &p_input->input, p_format,
73 sizeof(audio_sample_format_t) );
74 aout_FormatPrepare( &p_input->input );
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 );
205 vlc_mutex_unlock( &p_aout->mixer_lock );
215 /*****************************************************************************
216 * aout_DecNewBuffer : ask for a new empty buffer
217 *****************************************************************************/
218 aout_buffer_t * aout_DecNewBuffer( aout_instance_t * p_aout,
219 aout_input_t * p_input,
220 size_t i_nb_samples )
222 aout_buffer_t * p_buffer;
225 vlc_mutex_lock( &p_input->lock );
227 if ( p_input->b_error )
229 vlc_mutex_unlock( &p_input->lock );
233 duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
235 /* This necessarily allocates in the heap. */
236 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
237 p_buffer->i_nb_samples = i_nb_samples;
238 p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
239 / p_input->input.i_frame_length;
241 /* Suppose the decoder doesn't have more than one buffered buffer */
242 p_input->b_changed = 0;
244 vlc_mutex_unlock( &p_input->lock );
246 if ( p_buffer == NULL )
248 msg_Err( p_aout, "NULL buffer !" );
252 p_buffer->start_date = p_buffer->end_date = 0;
258 /*****************************************************************************
259 * aout_DecDeleteBuffer : destroy an undecoded buffer
260 *****************************************************************************/
261 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
262 aout_buffer_t * p_buffer )
264 aout_BufferFree( p_buffer );
267 /*****************************************************************************
268 * aout_DecPlay : filter & mix the decoded buffer
269 *****************************************************************************/
270 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
271 aout_buffer_t * p_buffer )
273 if ( p_buffer->start_date == 0 )
275 msg_Warn( p_aout, "non-dated buffer received" );
276 aout_BufferFree( p_buffer );
280 p_buffer->end_date = p_buffer->start_date
281 + (mtime_t)(p_buffer->i_nb_samples * 1000000)
282 / p_input->input.i_rate;
284 vlc_mutex_lock( &p_input->lock );
286 if ( p_input->b_error )
288 vlc_mutex_unlock( &p_input->lock );
289 aout_BufferFree( p_buffer );
293 if ( p_input->b_changed )
295 /* Maybe the allocation size has changed. Re-allocate a buffer. */
296 aout_buffer_t * p_new_buffer;
297 mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
298 / p_input->input.i_rate;
300 aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
301 p_aout->p_vlc->pf_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
302 p_buffer->i_nb_bytes );
303 p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
304 p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
305 p_new_buffer->start_date = p_buffer->start_date;
306 p_new_buffer->end_date = p_buffer->end_date;
307 aout_BufferFree( p_buffer );
308 p_buffer = p_new_buffer;
309 p_input->b_changed = 0;
312 /* If the buffer is too early, wait a while. */
313 mwait( p_buffer->start_date - AOUT_MAX_PREPARE_TIME );
315 if ( aout_InputPlay( p_aout, p_input, p_buffer ) == -1 )
317 vlc_mutex_unlock( &p_input->lock );
321 vlc_mutex_unlock( &p_input->lock );
323 /* Run the mixer if it is able to run. */
324 vlc_mutex_lock( &p_aout->mixer_lock );
325 aout_MixerRun( p_aout );
326 vlc_mutex_unlock( &p_aout->mixer_lock );