1 /*****************************************************************************
2 * ac3_decoder_thread.c: ac3 decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: ac3_decoder_thread.c,v 1.31 2001/05/01 04:18:18 sam Exp $
7 * Authors: Michel Lespinasse <walken@zoy.org>
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() */
48 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
50 #include "stream_control.h"
51 #include "input_ext-dec.h"
53 #include "audio_output.h"
55 #include "ac3_decoder.h"
56 #include "ac3_decoder_thread.h"
58 #define AC3DEC_FRAME_SIZE (2*1536)
60 /*****************************************************************************
62 *****************************************************************************/
63 static int InitThread (ac3dec_thread_t * p_adec);
64 static void RunThread (ac3dec_thread_t * p_adec);
65 static void ErrorThread (ac3dec_thread_t * p_adec);
66 static void EndThread (ac3dec_thread_t * p_adec);
67 static void BitstreamCallback ( bit_stream_t *p_bit_stream,
68 boolean_t b_new_pes );
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_t;
78 intf_DbgMsg( "ac3dec debug: creating ac3 decoder thread" );
80 /* Allocate the memory needed to store the thread's structure */
81 if((p_ac3dec_t = (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");
89 * Initialize the thread properties
91 p_ac3dec_t->p_config = p_config;
92 p_ac3dec_t->p_fifo = p_config->decoder_config.p_decoder_fifo;
94 /* Initialize the ac3 decoder structures */
95 ac3_init (&p_ac3dec_t->ac3_decoder);
98 * Initialize the output properties
100 p_ac3dec_t->p_aout_fifo = NULL;
102 /* Spawn the ac3 decoder thread */
103 if (vlc_thread_create(&p_ac3dec_t->thread_id, "ac3 decoder",
104 (vlc_thread_func_t)RunThread, (void *)p_ac3dec_t))
106 intf_ErrMsg( "ac3dec error: can't spawn ac3 decoder thread" );
111 intf_DbgMsg ("ac3dec debug: ac3 decoder thread (%p) created", p_ac3dec_t);
112 return p_ac3dec_t->thread_id;
115 /* Following functions are local */
117 /*****************************************************************************
118 * InitThread : initialize an ac3 decoder thread
119 *****************************************************************************/
120 static int InitThread (ac3dec_thread_t * p_ac3dec_t)
122 intf_DbgMsg("ac3dec debug: initializing ac3 decoder thread %p",p_ac3dec_t);
124 p_ac3dec_t->p_config->decoder_config.pf_init_bit_stream(
125 &p_ac3dec_t->ac3_decoder.bit_stream,
126 p_ac3dec_t->p_config->decoder_config.p_decoder_fifo,
127 BitstreamCallback, (void *) p_ac3dec_t );
129 /* Creating the audio output fifo */
130 p_ac3dec_t->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 0, 0,
131 AC3DEC_FRAME_SIZE, NULL );
132 if ( p_ac3dec_t->p_aout_fifo == NULL )
137 intf_DbgMsg("ac3dec debug: ac3 decoder thread %p initialized", p_ac3dec_t);
141 /*****************************************************************************
142 * RunThread : ac3 decoder thread
143 *****************************************************************************/
144 static void RunThread (ac3dec_thread_t * p_ac3dec_t)
148 intf_DbgMsg ("ac3dec debug: running ac3 decoder thread (%p) (pid == %i)", p_ac3dec_t, getpid());
150 /* Initializing the ac3 decoder thread */
151 if (InitThread (p_ac3dec_t)) /* XXX?? */
153 p_ac3dec_t->p_fifo->b_error = 1;
157 p_ac3dec_t->sync_ptr = 0;
159 /* ac3 decoder thread's main loop */
160 /* FIXME : do we have enough room to store the decoded frames ?? */
161 while ((!p_ac3dec_t->p_fifo->b_die) && (!p_ac3dec_t->p_fifo->b_error))
164 ac3_sync_info_t sync_info;
169 GetBits(&p_ac3dec_t->ac3_decoder.bit_stream,8);
170 } while ((!p_ac3dec_t->sync_ptr) && (!p_ac3dec_t->p_fifo->b_die)
171 && (!p_ac3dec_t->p_fifo->b_error));
173 ptr = p_ac3dec_t->sync_ptr;
175 while(ptr-- && (!p_ac3dec_t->p_fifo->b_die)
176 && (!p_ac3dec_t->p_fifo->b_error))
178 p_ac3dec_t->ac3_decoder.bit_stream.p_byte++;
181 /* we are in sync now */
185 if (DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts)
187 p_ac3dec_t->p_aout_fifo->date[p_ac3dec_t->p_aout_fifo->l_end_frame] =
188 DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts;
189 DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts = 0;
191 p_ac3dec_t->p_aout_fifo->date[p_ac3dec_t->p_aout_fifo->l_end_frame] =
195 if (ac3_sync_frame (&p_ac3dec_t->ac3_decoder, &sync_info))
201 p_ac3dec_t->p_aout_fifo->l_rate = sync_info.sample_rate;
203 buffer = ((s16 *)p_ac3dec_t->p_aout_fifo->buffer) +
204 (p_ac3dec_t->p_aout_fifo->l_end_frame * AC3DEC_FRAME_SIZE);
206 if (ac3_decode_frame (&p_ac3dec_t->ac3_decoder, buffer))
212 vlc_mutex_lock (&p_ac3dec_t->p_aout_fifo->data_lock);
213 p_ac3dec_t->p_aout_fifo->l_end_frame =
214 (p_ac3dec_t->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
215 vlc_cond_signal (&p_ac3dec_t->p_aout_fifo->data_wait);
216 vlc_mutex_unlock (&p_ac3dec_t->p_aout_fifo->data_lock);
219 RealignBits(&p_ac3dec_t->ac3_decoder.bit_stream);
222 /* If b_error is set, the ac3 decoder thread enters the error loop */
223 if (p_ac3dec_t->p_fifo->b_error)
225 ErrorThread (p_ac3dec_t);
228 /* End of the ac3 decoder thread */
229 EndThread (p_ac3dec_t);
232 /*****************************************************************************
233 * ErrorThread : ac3 decoder's RunThread() error loop
234 *****************************************************************************/
235 static void ErrorThread (ac3dec_thread_t * p_ac3dec_t)
237 /* We take the lock, because we are going to read/write the start/end
238 * indexes of the decoder fifo */
239 vlc_mutex_lock (&p_ac3dec_t->p_fifo->data_lock);
241 /* Wait until a `die' order is sent */
242 while (!p_ac3dec_t->p_fifo->b_die)
244 /* Trash all received PES packets */
245 while (!DECODER_FIFO_ISEMPTY(*p_ac3dec_t->p_fifo))
247 p_ac3dec_t->p_fifo->pf_delete_pes(p_ac3dec_t->p_fifo->p_packets_mgt,
248 DECODER_FIFO_START(*p_ac3dec_t->p_fifo));
249 DECODER_FIFO_INCSTART (*p_ac3dec_t->p_fifo);
252 /* Waiting for the input thread to put new PES packets in the fifo */
253 vlc_cond_wait (&p_ac3dec_t->p_fifo->data_wait,
254 &p_ac3dec_t->p_fifo->data_lock);
257 /* We can release the lock before leaving */
258 vlc_mutex_unlock (&p_ac3dec_t->p_fifo->data_lock);
261 /*****************************************************************************
262 * EndThread : ac3 decoder thread destruction
263 *****************************************************************************/
264 static void EndThread (ac3dec_thread_t * p_ac3dec_t)
266 intf_DbgMsg ("ac3dec debug: destroying ac3 decoder thread %p", p_ac3dec_t);
268 /* If the audio output fifo was created, we destroy it */
269 if (p_ac3dec_t->p_aout_fifo != NULL)
271 aout_DestroyFifo (p_ac3dec_t->p_aout_fifo);
273 /* Make sure the output thread leaves the NextFrame() function */
274 vlc_mutex_lock (&(p_ac3dec_t->p_aout_fifo->data_lock));
275 vlc_cond_signal (&(p_ac3dec_t->p_aout_fifo->data_wait));
276 vlc_mutex_unlock (&(p_ac3dec_t->p_aout_fifo->data_lock));
280 /* Destroy descriptor */
281 free( p_ac3dec_t->p_config );
284 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p destroyed", p_ac3dec_t);
287 /*****************************************************************************
288 * BitstreamCallback: Import parameters from the new data/PES packet
289 *****************************************************************************
290 * This function is called by input's NextDataPacket.
291 *****************************************************************************/
292 static void BitstreamCallback ( bit_stream_t * p_bit_stream,
296 ac3dec_thread_t *p_ac3dec_t=(ac3dec_thread_t *)p_bit_stream->p_callback_arg;
302 ptr = *(p_bit_stream->p_byte + 1);
304 ptr |= *(p_bit_stream->p_byte + 2);
305 p_ac3dec_t->sync_ptr = ptr;
306 p_bit_stream->p_byte += 3;