1 /*****************************************************************************
2 * audio_decoder.c: MPEG audio decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: audio_decoder.c,v 1.45 2001/01/05 18:46:44 massiot Exp $
7 * Authors: Michel Kaempf <maxx@via.ecp.fr>
8 * Michel Lespinasse <walken@via.ecp.fr>
9 * Samuel Hocevar <sam@via.ecp.fr>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
29 * - optimiser les NeedBits() et les GetBits() du code là où c'est possible ;
30 * - vlc_cond_signal() / vlc_cond_wait() ;
34 /*****************************************************************************
36 *****************************************************************************/
39 #include <unistd.h> /* getpid() */
41 #include <stdio.h> /* "intf_msg.h" */
42 #include <stdlib.h> /* malloc(), free() */
50 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
52 #include "stream_control.h"
53 #include "input_ext-dec.h"
55 #include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */
57 #include "adec_generic.h"
58 #include "audio_decoder.h"
59 #include "adec_math.h" /* DCT32(), PCM() */
61 #define ADEC_FRAME_SIZE (2*1152)
63 /*****************************************************************************
65 *****************************************************************************/
66 static int InitThread (adec_thread_t * p_adec);
67 static void RunThread (adec_thread_t * p_adec);
68 static void ErrorThread (adec_thread_t * p_adec);
69 static void EndThread (adec_thread_t * p_adec);
71 /*****************************************************************************
72 * adec_CreateThread: creates an audio decoder thread
73 *****************************************************************************
74 * This function creates a new audio decoder thread, and returns a pointer to
75 * its description. On error, it returns NULL.
76 *****************************************************************************/
77 vlc_thread_t adec_CreateThread ( adec_config_t * p_config )
79 adec_thread_t * p_adec;
81 intf_DbgMsg ( "adec debug: creating audio decoder thread" );
83 /* Allocate the memory needed to store the thread's structure */
84 if ( (p_adec = (adec_thread_t *)malloc (sizeof(adec_thread_t))) == NULL )
86 intf_ErrMsg ( "adec error: not enough memory for adec_CreateThread() to create the new thread" );
91 * Initialize the thread properties
93 p_adec->p_config = p_config;
94 p_adec->p_fifo = p_config->decoder_config.p_decoder_fifo;
98 * Initialize the decoder properties
100 adec_init ( &p_adec->audio_decoder );
103 * Initialize the output properties
105 p_adec->p_aout = p_config->p_aout;
106 p_adec->p_aout_fifo = NULL;
108 /* Spawn the audio decoder thread */
109 if ( vlc_thread_create(&p_adec->thread_id, "audio decoder", (vlc_thread_func_t)RunThread, (void *)p_adec) )
111 intf_ErrMsg ("adec error: can't spawn audio decoder thread");
116 intf_DbgMsg ("adec debug: audio decoder thread (%p) created", p_adec);
117 return p_adec->thread_id;
120 /*****************************************************************************
121 * InitThread : initialize an audio decoder thread
122 *****************************************************************************
123 * This function is called from RunThread and performs the second step of the
124 * initialization. It returns 0 on success.
125 *****************************************************************************/
126 static int InitThread (adec_thread_t * p_adec)
128 aout_fifo_t aout_fifo;
129 adec_byte_stream_t * byte_stream;
131 intf_DbgMsg ("adec debug: initializing audio decoder thread %p", p_adec);
133 /* Our first job is to initialize the bit stream structure with the
134 * beginning of the input stream */
135 vlc_mutex_lock ( &p_adec->p_fifo->data_lock );
136 while ( DECODER_FIFO_ISEMPTY(*p_adec->p_fifo) )
138 if (p_adec->p_fifo->b_die)
140 vlc_mutex_unlock ( &p_adec->p_fifo->data_lock );
143 vlc_cond_wait ( &p_adec->p_fifo->data_wait, &p_adec->p_fifo->data_lock );
145 p_adec->p_data = DECODER_FIFO_START ( *p_adec->p_fifo )->p_first;
146 byte_stream = adec_byte_stream ( &p_adec->audio_decoder );
147 byte_stream->p_byte = p_adec->p_data->p_payload_start;
148 byte_stream->p_end = p_adec->p_data->p_payload_end;
149 byte_stream->info = p_adec;
150 vlc_mutex_unlock ( &p_adec->p_fifo->data_lock );
152 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
153 aout_fifo.i_channels = 2;
154 aout_fifo.b_stereo = 1;
155 aout_fifo.l_frame_size = ADEC_FRAME_SIZE;
157 /* Creating the audio output fifo */
158 if ( (p_adec->p_aout_fifo = aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
163 intf_DbgMsg ( "adec debug: audio decoder thread %p initialized", p_adec );
167 /*****************************************************************************
168 * RunThread : audio decoder thread
169 *****************************************************************************
170 * Audio decoder thread. This function does only returns when the thread is
172 *****************************************************************************/
173 static void RunThread (adec_thread_t * p_adec)
177 intf_DbgMsg ( "adec debug: running audio decoder thread (%p) (pid == %i)", p_adec, getpid() );
179 /* You really suck */
180 //msleep ( INPUT_PTS_DELAY );
182 /* Initializing the audio decoder thread */
183 if( InitThread (p_adec) )
185 p_adec->p_fifo->b_error = 1;
190 /* Audio decoder thread's main loop */
191 while( (!p_adec->p_fifo->b_die) && (!p_adec->p_fifo->b_error) )
194 adec_sync_info_t sync_info;
198 /* have to find a synchro point */
199 adec_byte_stream_t * p_byte_stream;
201 intf_DbgMsg ( "adec: sync" );
203 p_byte_stream = adec_byte_stream ( &p_adec->audio_decoder );
204 /* FIXME: the check will be done later, am I right ? */
206 /* FIXME: is this really needed ?
207 adec_byte_stream_next ( p_byte_stream ); */
209 if( p_adec->p_fifo->b_die || p_adec->p_fifo->b_error )
216 if( DECODER_FIFO_START( *p_adec->p_fifo)->i_pts )
218 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
219 DECODER_FIFO_START( *p_adec->p_fifo )->i_pts;
220 DECODER_FIFO_START(*p_adec->p_fifo)->i_pts = 0;
224 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
228 if( adec_sync_frame (&p_adec->audio_decoder, &sync_info) )
235 p_adec->p_aout_fifo->l_rate = sync_info.sample_rate;
237 buffer = ((s16 *)p_adec->p_aout_fifo->buffer)
238 + (p_adec->p_aout_fifo->l_end_frame * ADEC_FRAME_SIZE);
240 if( adec_decode_frame (&p_adec->audio_decoder, buffer) )
246 vlc_mutex_lock (&p_adec->p_aout_fifo->data_lock);
248 p_adec->p_aout_fifo->l_end_frame =
249 (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
250 vlc_cond_signal (&p_adec->p_aout_fifo->data_wait);
251 vlc_mutex_unlock (&p_adec->p_aout_fifo->data_lock);
256 /* If b_error is set, the audio decoder thread enters the error loop */
257 if( p_adec->p_fifo->b_error )
259 ErrorThread( p_adec );
262 /* End of the audio decoder thread */
266 /*****************************************************************************
267 * ErrorThread : audio decoder's RunThread() error loop
268 *****************************************************************************
269 * This function is called when an error occured during thread main's loop. The
270 * thread can still receive feed, but must be ready to terminate as soon as
272 *****************************************************************************/
273 static void ErrorThread ( adec_thread_t *p_adec )
275 /* We take the lock, because we are going to read/write the start/end
276 * indexes of the decoder fifo */
277 vlc_mutex_lock ( &p_adec->p_fifo->data_lock );
279 /* Wait until a `die' order is sent */
280 while ( !p_adec->p_fifo->b_die )
282 /* Trash all received PES packets */
283 while ( !DECODER_FIFO_ISEMPTY(*p_adec->p_fifo) )
285 p_adec->p_fifo->pf_delete_pes ( p_adec->p_fifo->p_packets_mgt,
286 DECODER_FIFO_START(*p_adec->p_fifo) );
287 DECODER_FIFO_INCSTART ( *p_adec->p_fifo );
290 /* Waiting for the input thread to put new PES packets in the fifo */
291 vlc_cond_wait ( &p_adec->p_fifo->data_wait, &p_adec->p_fifo->data_lock );
294 /* We can release the lock before leaving */
295 vlc_mutex_unlock ( &p_adec->p_fifo->data_lock );
298 /*****************************************************************************
299 * EndThread : audio decoder thread destruction
300 *****************************************************************************
301 * This function is called when the thread ends after a sucessful
303 *****************************************************************************/
304 static void EndThread ( adec_thread_t *p_adec )
306 intf_DbgMsg ( "adec debug: destroying audio decoder thread %p", p_adec );
308 /* If the audio output fifo was created, we destroy it */
309 if ( p_adec->p_aout_fifo != NULL )
311 aout_DestroyFifo ( p_adec->p_aout_fifo );
313 /* Make sure the output thread leaves the NextFrame() function */
314 vlc_mutex_lock (&(p_adec->p_aout_fifo->data_lock));
315 vlc_cond_signal (&(p_adec->p_aout_fifo->data_wait));
316 vlc_mutex_unlock (&(p_adec->p_aout_fifo->data_lock));
318 /* Destroy descriptor */
319 free( p_adec->p_config );
322 intf_DbgMsg ("adec debug: audio decoder thread %p destroyed", p_adec);
325 void adec_byte_stream_next ( adec_byte_stream_t * p_byte_stream )
327 adec_thread_t * p_adec = p_byte_stream->info;
329 /* We are looking for the next TS packet that contains real data,
330 * and not just a PES header */
333 /* We were reading the last TS packet of this PES packet... It's
334 * time to jump to the next PES packet */
335 if (p_adec->p_data->p_next == NULL)
337 /* We are going to read/write the start and end indexes of the
338 * decoder fifo and to use the fifo's conditional variable,
339 * that's why we need to take the lock before */
340 vlc_mutex_lock (&p_adec->p_fifo->data_lock);
342 /* Is the input thread dying ? */
343 if (p_adec->p_fifo->b_die)
345 vlc_mutex_unlock (&(p_adec->p_fifo->data_lock));
349 /* We should increase the start index of the decoder fifo, but
350 * if we do this now, the input thread could overwrite the
351 * pointer to the current PES packet, and we weren't able to
352 * give it back to the netlist. That's why we free the PES
354 p_adec->p_fifo->pf_delete_pes (p_adec->p_fifo->p_packets_mgt,
355 DECODER_FIFO_START(*p_adec->p_fifo));
356 DECODER_FIFO_INCSTART (*p_adec->p_fifo);
358 while (DECODER_FIFO_ISEMPTY(*p_adec->p_fifo))
360 vlc_cond_wait (&p_adec->p_fifo->data_wait, &p_adec->p_fifo->data_lock);
361 if (p_adec->p_fifo->b_die)
363 vlc_mutex_unlock (&(p_adec->p_fifo->data_lock));
368 /* The next byte could be found in the next PES packet */
369 p_adec->p_data = DECODER_FIFO_START (*p_adec->p_fifo)->p_first;
371 /* We can release the fifo's data lock */
372 vlc_mutex_unlock (&p_adec->p_fifo->data_lock);
374 /* Perhaps the next TS packet of the current PES packet contains
375 * real data (ie its payload's size is greater than 0) */
378 p_adec->p_data = p_adec->p_data->p_next;
380 } while (p_adec->p_data->p_payload_start == p_adec->p_data->p_payload_end);
382 /* We've found a TS packet which contains interesting data... */
383 p_byte_stream->p_byte = p_adec->p_data->p_payload_start;
384 p_byte_stream->p_end = p_adec->p_data->p_payload_end;