1 /*****************************************************************************
2 * ac3_decoder_thread.c: ac3 decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
26 * - vérifier l'état de la fifo de sortie avant d'y stocker les samples
28 * - vlc_cond_signal() / vlc_cond_wait()
32 /*****************************************************************************
34 *****************************************************************************/
37 #include <unistd.h> /* getpid() */
39 #include <stdio.h> /* "intf_msg.h" */
40 #include <stdlib.h> /* malloc(), free() */
41 #include <sys/types.h> /* on BSD, uio.h needs types.h */
42 #include <sys/uio.h> /* "input.h" */
49 #include "debug.h" /* "input_netlist.h" */
51 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
53 #include "stream_control.h"
54 #include "input_ext-dec.h"
56 #include "audio_output.h"
58 #include "ac3_decoder.h"
59 #include "ac3_decoder_thread.h"
61 #define AC3DEC_FRAME_SIZE (2*1536)
63 /*****************************************************************************
65 *****************************************************************************/
66 static int InitThread (ac3dec_thread_t * p_adec);
67 static void RunThread (ac3dec_thread_t * p_adec);
68 static void ErrorThread (ac3dec_thread_t * p_adec);
69 static void EndThread (ac3dec_thread_t * p_adec);
71 /*****************************************************************************
72 * ac3dec_CreateThread: creates an ac3 decoder thread
73 *****************************************************************************/
74 vlc_thread_t ac3dec_CreateThread( adec_config_t * p_config )
76 ac3dec_thread_t * p_ac3dec;
78 intf_DbgMsg( "ac3dec debug: creating ac3 decoder thread\n" );
80 /* Allocate the memory needed to store the thread's structure */
81 if ((p_ac3dec = (ac3dec_thread_t *)malloc (sizeof(ac3dec_thread_t))) == NULL)
83 intf_ErrMsg ( "ac3dec error: not enough memory "
84 "for ac3dec_CreateThread() to create the new thread\n");
89 * Initialize the thread properties
92 p_ac3dec->b_error = 0;
93 p_ac3dec->p_config = p_config;
94 p_ac3dec->p_fifo = p_config->decoder_config.p_decoder_fifo;
96 /* Initialize the ac3 decoder structures */
97 ac3_init (&p_ac3dec->ac3_decoder);
100 * Initialize the output properties
102 p_ac3dec->p_aout = p_config->p_aout;
103 p_ac3dec->p_aout_fifo = NULL;
105 /* Spawn the ac3 decoder thread */
106 if (vlc_thread_create(&p_ac3dec->thread_id, "ac3 decoder", (vlc_thread_func_t)RunThread, (void *)p_ac3dec))
108 intf_ErrMsg( "ac3dec error: can't spawn ac3 decoder thread\n" );
113 intf_DbgMsg ("ac3dec debug: ac3 decoder thread (%p) created\n", p_ac3dec);
114 return p_ac3dec->thread_id;
117 /* Following functions are local */
119 /*****************************************************************************
120 * InitThread : initialize an ac3 decoder thread
121 *****************************************************************************/
122 static int InitThread (ac3dec_thread_t * p_ac3dec)
124 aout_fifo_t aout_fifo;
125 ac3_byte_stream_t * byte_stream;
127 intf_DbgMsg ("ac3dec debug: initializing ac3 decoder thread %p\n", p_ac3dec);
129 /* Get the first data packet. */
130 vlc_mutex_lock( &p_ac3dec->p_fifo->data_lock );
131 while ( DECODER_FIFO_ISEMPTY( *p_ac3dec->p_fifo ) )
133 if ( p_ac3dec->p_fifo->b_die )
135 vlc_mutex_unlock( &p_ac3dec->p_fifo->data_lock );
138 vlc_cond_wait( &p_ac3dec->p_fifo->data_wait, &p_ac3dec->p_fifo->data_lock );
140 p_ac3dec->p_data = DECODER_FIFO_START(*p_ac3dec->p_fifo)->p_first;
141 byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
142 byte_stream->p_byte = p_ac3dec->p_data->p_payload_start;
143 byte_stream->p_end = p_ac3dec->p_data->p_payload_end;
144 byte_stream->info = p_ac3dec;
145 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
147 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
148 aout_fifo.i_channels = 2;
149 aout_fifo.b_stereo = 1;
151 aout_fifo.l_frame_size = AC3DEC_FRAME_SIZE;
153 /* Creating the audio output fifo */
154 if ((p_ac3dec->p_aout_fifo = aout_CreateFifo(p_ac3dec->p_aout, &aout_fifo)) == NULL)
159 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p initialized\n", p_ac3dec);
163 /*****************************************************************************
164 * RunThread : ac3 decoder thread
165 *****************************************************************************/
166 static void RunThread (ac3dec_thread_t * p_ac3dec)
170 intf_DbgMsg ("ac3dec debug: running ac3 decoder thread (%p) (pid == %i)\n", p_ac3dec, getpid());
172 /* FIXME ! Qu'est-ce que c'est que ce bordel !?!?!?!? --Meuuh */
173 //msleep (INPUT_PTS_DELAY);
175 /* Initializing the ac3 decoder thread */
176 if (InitThread (p_ac3dec)) /* XXX?? */
178 p_ac3dec->b_error = 1;
182 p_ac3dec->sync_ptr = 0;
184 /* ac3 decoder thread's main loop */
185 /* FIXME : do we have enough room to store the decoded frames ?? */
186 while ((!p_ac3dec->b_die) && (!p_ac3dec->b_error))
189 ac3_sync_info_t sync_info;
191 if (!sync) { /* have to find a synchro point */
193 ac3_byte_stream_t * p_byte_stream;
195 intf_DbgMsg ("ac3dec: sync\n");
197 p_byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
199 /* first read till next ac3 magic header */
202 ac3_byte_stream_next (p_byte_stream);
203 } while ((!p_ac3dec->sync_ptr) &&
204 (!p_ac3dec->b_die) &&
205 (!p_ac3dec->b_error));
206 /* skip the specified number of bytes */
208 if( p_ac3dec->b_die || p_ac3dec->b_error )
213 ptr = p_ac3dec->sync_ptr;
214 while (--ptr && (!p_ac3dec->b_die) && (!p_ac3dec->b_error))
216 if (p_byte_stream->p_byte >= p_byte_stream->p_end)
218 ac3_byte_stream_next (p_byte_stream);
220 p_byte_stream->p_byte++;
223 if( p_ac3dec->b_die || p_ac3dec->b_error )
228 /* we are in sync now */
230 p_ac3dec->sync_ptr = 0;
233 if (DECODER_FIFO_START(*p_ac3dec->p_fifo)->b_has_pts)
235 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(*p_ac3dec->p_fifo)->i_pts;
236 DECODER_FIFO_START(*p_ac3dec->p_fifo)->b_has_pts = 0;
240 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
243 if (ac3_sync_frame (&p_ac3dec->ac3_decoder, &sync_info))
249 p_ac3dec->p_aout_fifo->l_rate = sync_info.sample_rate;
251 buffer = ((s16 *)p_ac3dec->p_aout_fifo->buffer) + (p_ac3dec->p_aout_fifo->l_end_frame * AC3DEC_FRAME_SIZE);
253 if (ac3_decode_frame (&p_ac3dec->ac3_decoder, buffer))
259 vlc_mutex_lock (&p_ac3dec->p_aout_fifo->data_lock);
260 p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
261 vlc_cond_signal (&p_ac3dec->p_aout_fifo->data_wait);
262 vlc_mutex_unlock (&p_ac3dec->p_aout_fifo->data_lock);
267 /* If b_error is set, the ac3 decoder thread enters the error loop */
268 if (p_ac3dec->b_error)
270 ErrorThread (p_ac3dec);
273 /* End of the ac3 decoder thread */
274 EndThread (p_ac3dec);
277 /*****************************************************************************
278 * ErrorThread : ac3 decoder's RunThread() error loop
279 *****************************************************************************/
280 static void ErrorThread (ac3dec_thread_t * p_ac3dec)
282 /* We take the lock, because we are going to read/write the start/end
283 * indexes of the decoder fifo */
284 vlc_mutex_lock (&p_ac3dec->p_fifo->data_lock);
286 /* Wait until a `die' order is sent */
287 while (!p_ac3dec->b_die)
289 /* Trash all received PES packets */
290 while (!DECODER_FIFO_ISEMPTY(*p_ac3dec->p_fifo))
292 p_ac3dec->p_fifo->pf_delete_pes(p_ac3dec->p_fifo->p_packets_mgt,
293 DECODER_FIFO_START(*p_ac3dec->p_fifo));
294 DECODER_FIFO_INCSTART (*p_ac3dec->p_fifo);
297 /* Waiting for the input thread to put new PES packets in the fifo */
298 vlc_cond_wait (&p_ac3dec->p_fifo->data_wait,
299 &p_ac3dec->p_fifo->data_lock);
302 /* We can release the lock before leaving */
303 vlc_mutex_unlock (&p_ac3dec->p_fifo->data_lock);
306 /*****************************************************************************
307 * EndThread : ac3 decoder thread destruction
308 *****************************************************************************/
309 static void EndThread (ac3dec_thread_t * p_ac3dec)
311 intf_DbgMsg ("ac3dec debug: destroying ac3 decoder thread %p\n", p_ac3dec);
313 /* If the audio output fifo was created, we destroy it */
314 if (p_ac3dec->p_aout_fifo != NULL)
316 aout_DestroyFifo (p_ac3dec->p_aout_fifo);
318 /* Make sure the output thread leaves the NextFrame() function */
319 vlc_mutex_lock (&(p_ac3dec->p_aout_fifo->data_lock));
320 vlc_cond_signal (&(p_ac3dec->p_aout_fifo->data_wait));
321 vlc_mutex_unlock (&(p_ac3dec->p_aout_fifo->data_lock));
324 /* Destroy descriptor */
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;