1 /*****************************************************************************
2 * ac3_decoder_thread.c: ac3 decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: ac3_decoder_thread.c,v 1.20 2000/12/21 14:18:15 massiot Exp $
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 *****************************************************************************/
27 * - vérifier l'état de la fifo de sortie avant d'y stocker les samples
29 * - vlc_cond_signal() / vlc_cond_wait()
33 /*****************************************************************************
35 *****************************************************************************/
38 #include <unistd.h> /* getpid() */
40 #include <stdio.h> /* "intf_msg.h" */
41 #include <stdlib.h> /* malloc(), free() */
42 #include <sys/types.h> /* on BSD, uio.h needs types.h */
43 #include <sys/uio.h> /* "input.h" */
50 #include "debug.h" /* "input_netlist.h" */
52 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
54 #include "stream_control.h"
55 #include "input_ext-dec.h"
57 #include "audio_output.h"
59 #include "ac3_decoder.h"
60 #include "ac3_decoder_thread.h"
62 #define AC3DEC_FRAME_SIZE (2*1536)
64 /*****************************************************************************
66 *****************************************************************************/
67 static int InitThread (ac3dec_thread_t * p_adec);
68 static void RunThread (ac3dec_thread_t * p_adec);
69 static void ErrorThread (ac3dec_thread_t * p_adec);
70 static void EndThread (ac3dec_thread_t * p_adec);
72 /*****************************************************************************
73 * ac3dec_CreateThread: creates an ac3 decoder thread
74 *****************************************************************************/
75 vlc_thread_t ac3dec_CreateThread( adec_config_t * p_config )
77 ac3dec_thread_t * p_ac3dec;
79 intf_DbgMsg( "ac3dec debug: creating ac3 decoder thread\n" );
81 /* Allocate the memory needed to store the thread's structure */
82 if ((p_ac3dec = (ac3dec_thread_t *)malloc (sizeof(ac3dec_thread_t))) == NULL)
84 intf_ErrMsg ( "ac3dec error: not enough memory "
85 "for ac3dec_CreateThread() to create the new thread\n");
90 * Initialize the thread properties
92 p_ac3dec->p_config = p_config;
93 p_ac3dec->p_fifo = p_config->decoder_config.p_decoder_fifo;
95 /* Initialize the ac3 decoder structures */
96 ac3_init (&p_ac3dec->ac3_decoder);
99 * Initialize the output properties
101 p_ac3dec->p_aout = p_config->p_aout;
102 p_ac3dec->p_aout_fifo = NULL;
104 /* Spawn the ac3 decoder thread */
105 if (vlc_thread_create(&p_ac3dec->thread_id, "ac3 decoder", (vlc_thread_func_t)RunThread, (void *)p_ac3dec))
107 intf_ErrMsg( "ac3dec error: can't spawn ac3 decoder thread\n" );
112 intf_DbgMsg ("ac3dec debug: ac3 decoder thread (%p) created\n", p_ac3dec);
113 return p_ac3dec->thread_id;
116 /* Following functions are local */
118 /*****************************************************************************
119 * InitThread : initialize an ac3 decoder thread
120 *****************************************************************************/
121 static int InitThread (ac3dec_thread_t * p_ac3dec)
123 aout_fifo_t aout_fifo;
124 ac3_byte_stream_t * byte_stream;
126 intf_DbgMsg ("ac3dec debug: initializing ac3 decoder thread %p\n", p_ac3dec);
128 /* Get the first data packet. */
129 vlc_mutex_lock( &p_ac3dec->p_fifo->data_lock );
130 while ( DECODER_FIFO_ISEMPTY( *p_ac3dec->p_fifo ) )
132 if ( p_ac3dec->p_fifo->b_die )
134 vlc_mutex_unlock( &p_ac3dec->p_fifo->data_lock );
137 vlc_cond_wait( &p_ac3dec->p_fifo->data_wait, &p_ac3dec->p_fifo->data_lock );
139 p_ac3dec->p_data = DECODER_FIFO_START(*p_ac3dec->p_fifo)->p_first;
140 byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
141 byte_stream->p_byte = p_ac3dec->p_data->p_payload_start;
142 byte_stream->p_end = p_ac3dec->p_data->p_payload_end;
143 byte_stream->info = p_ac3dec;
144 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
146 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
147 aout_fifo.i_channels = 2;
148 aout_fifo.b_stereo = 1;
150 aout_fifo.l_frame_size = AC3DEC_FRAME_SIZE;
152 /* Creating the audio output fifo */
153 if ((p_ac3dec->p_aout_fifo = aout_CreateFifo(p_ac3dec->p_aout, &aout_fifo)) == NULL)
158 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p initialized\n", p_ac3dec);
162 /*****************************************************************************
163 * RunThread : ac3 decoder thread
164 *****************************************************************************/
165 static void RunThread (ac3dec_thread_t * p_ac3dec)
169 intf_DbgMsg ("ac3dec debug: running ac3 decoder thread (%p) (pid == %i)\n", p_ac3dec, getpid());
171 /* FIXME ! Qu'est-ce que c'est que ce bordel !?!?!?!? --Meuuh */
172 //msleep (INPUT_PTS_DELAY);
174 /* Initializing the ac3 decoder thread */
175 if (InitThread (p_ac3dec)) /* XXX?? */
177 p_ac3dec->p_fifo->b_error = 1;
181 p_ac3dec->sync_ptr = 0;
183 /* ac3 decoder thread's main loop */
184 /* FIXME : do we have enough room to store the decoded frames ?? */
185 while ((!p_ac3dec->p_fifo->b_die) && (!p_ac3dec->p_fifo->b_error))
188 ac3_sync_info_t sync_info;
190 if (!sync) { /* have to find a synchro point */
192 ac3_byte_stream_t * p_byte_stream;
194 intf_DbgMsg ("ac3dec: sync\n");
196 p_byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
198 /* first read till next ac3 magic header */
201 ac3_byte_stream_next (p_byte_stream);
202 } while ((!p_ac3dec->sync_ptr) &&
203 (!p_ac3dec->p_fifo->b_die) &&
204 (!p_ac3dec->p_fifo->b_error));
205 /* skip the specified number of bytes */
207 if( p_ac3dec->p_fifo->b_die || p_ac3dec->p_fifo->b_error )
212 ptr = p_ac3dec->sync_ptr;
213 while (--ptr && (!p_ac3dec->p_fifo->b_die) && (!p_ac3dec->p_fifo->b_error))
215 if (p_byte_stream->p_byte >= p_byte_stream->p_end)
217 ac3_byte_stream_next (p_byte_stream);
219 p_byte_stream->p_byte++;
222 if( p_ac3dec->p_fifo->b_die || p_ac3dec->p_fifo->b_error )
227 /* we are in sync now */
229 p_ac3dec->sync_ptr = 0;
232 if (DECODER_FIFO_START(*p_ac3dec->p_fifo)->b_has_pts)
234 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(*p_ac3dec->p_fifo)->i_pts;
235 DECODER_FIFO_START(*p_ac3dec->p_fifo)->b_has_pts = 0;
239 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
242 if (ac3_sync_frame (&p_ac3dec->ac3_decoder, &sync_info))
248 p_ac3dec->p_aout_fifo->l_rate = sync_info.sample_rate;
250 buffer = ((s16 *)p_ac3dec->p_aout_fifo->buffer) + (p_ac3dec->p_aout_fifo->l_end_frame * AC3DEC_FRAME_SIZE);
252 if (ac3_decode_frame (&p_ac3dec->ac3_decoder, buffer))
258 vlc_mutex_lock (&p_ac3dec->p_aout_fifo->data_lock);
259 p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
260 vlc_cond_signal (&p_ac3dec->p_aout_fifo->data_wait);
261 vlc_mutex_unlock (&p_ac3dec->p_aout_fifo->data_lock);
266 /* If b_error is set, the ac3 decoder thread enters the error loop */
267 if (p_ac3dec->p_fifo->b_error)
269 ErrorThread (p_ac3dec);
272 /* End of the ac3 decoder thread */
273 EndThread (p_ac3dec);
276 /*****************************************************************************
277 * ErrorThread : ac3 decoder's RunThread() error loop
278 *****************************************************************************/
279 static void ErrorThread (ac3dec_thread_t * p_ac3dec)
281 /* We take the lock, because we are going to read/write the start/end
282 * indexes of the decoder fifo */
283 vlc_mutex_lock (&p_ac3dec->p_fifo->data_lock);
285 /* Wait until a `die' order is sent */
286 while (!p_ac3dec->p_fifo->b_die)
288 /* Trash all received PES packets */
289 while (!DECODER_FIFO_ISEMPTY(*p_ac3dec->p_fifo))
291 p_ac3dec->p_fifo->pf_delete_pes(p_ac3dec->p_fifo->p_packets_mgt,
292 DECODER_FIFO_START(*p_ac3dec->p_fifo));
293 DECODER_FIFO_INCSTART (*p_ac3dec->p_fifo);
296 /* Waiting for the input thread to put new PES packets in the fifo */
297 vlc_cond_wait (&p_ac3dec->p_fifo->data_wait,
298 &p_ac3dec->p_fifo->data_lock);
301 /* We can release the lock before leaving */
302 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
305 /*****************************************************************************
306 * EndThread : ac3 decoder thread destruction
307 *****************************************************************************/
308 static void EndThread (ac3dec_thread_t * p_ac3dec)
310 intf_DbgMsg ("ac3dec debug: destroying ac3 decoder thread %p\n", p_ac3dec);
312 /* If the audio output fifo was created, we destroy it */
313 if (p_ac3dec->p_aout_fifo != NULL)
315 aout_DestroyFifo (p_ac3dec->p_aout_fifo);
317 /* Make sure the output thread leaves the NextFrame() function */
318 vlc_mutex_lock (&(p_ac3dec->p_aout_fifo->data_lock));
319 vlc_cond_signal (&(p_ac3dec->p_aout_fifo->data_wait));
320 vlc_mutex_unlock (&(p_ac3dec->p_aout_fifo->data_lock));
323 /* Destroy descriptor */
324 free( p_ac3dec->p_config );
327 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p destroyed\n", p_ac3dec);
330 void ac3_byte_stream_next (ac3_byte_stream_t * p_byte_stream)
332 ac3dec_thread_t * p_ac3dec = p_byte_stream->info;
334 /* We are looking for the next TS packet that contains real data,
335 * and not just a PES header */
338 /* We were reading the last TS packet of this PES packet... It's
339 * time to jump to the next PES packet */
340 if (p_ac3dec->p_data->p_next == NULL)
344 /* We are going to read/write the start and end indexes of the
345 * decoder fifo and to use the fifo's conditional variable,
346 * that's why we need to take the lock before */
347 vlc_mutex_lock (&p_ac3dec->p_fifo->data_lock);
349 /* Is the input thread dying ? */
350 if (p_ac3dec->p_fifo->b_die)
352 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
356 /* We should increase the start index of the decoder fifo, but
357 * if we do this now, the input thread could overwrite the
358 * pointer to the current PES packet, and we weren't able to
359 * give it back to the netlist. That's why we free the PES
361 p_ac3dec->p_fifo->pf_delete_pes(p_ac3dec->p_fifo->p_packets_mgt,
362 DECODER_FIFO_START(*p_ac3dec->p_fifo));
364 DECODER_FIFO_INCSTART (*p_ac3dec->p_fifo);
366 while (DECODER_FIFO_ISEMPTY(*p_ac3dec->p_fifo))
368 vlc_cond_wait(&p_ac3dec->p_fifo->data_wait, &p_ac3dec->p_fifo->data_lock);
370 if (p_ac3dec->p_fifo->b_die)
372 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
377 /* The next byte could be found in the next PES packet */
378 p_ac3dec->p_data = DECODER_FIFO_START(*p_ac3dec->p_fifo)->p_first;
380 /* parse ac3 magic header */
381 ptr = *(p_ac3dec->p_data->p_payload_start + 1);
383 ptr |= *(p_ac3dec->p_data->p_payload_start + 2);
384 p_ac3dec->sync_ptr = ptr;
385 p_ac3dec->p_data->p_payload_start += 3;
387 /* We can release the fifo's data lock */
388 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
390 /* Perhaps the next TS packet of the current PES packet contains
391 * real data (ie its payload's size is greater than 0) */
394 p_ac3dec->p_data = p_ac3dec->p_data->p_next;
396 } while (p_ac3dec->p_data->p_payload_start == p_ac3dec->p_data->p_payload_end);
397 p_byte_stream->p_byte = p_ac3dec->p_data->p_payload_start;
398 p_byte_stream->p_end = p_ac3dec->p_data->p_payload_end;