1 /*****************************************************************************
2 * ac3_decoder_thread.c: ac3 decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: ac3_decoder_thread.c,v 1.32 2001/05/06 04:32:02 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() */
42 #include <string.h> /* memset() */
49 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
51 #include "stream_control.h"
52 #include "input_ext-dec.h"
54 #include "audio_output.h"
56 #include "ac3_decoder.h"
57 #include "ac3_decoder_thread.h"
59 #define AC3DEC_FRAME_SIZE (2*1536)
61 /*****************************************************************************
63 *****************************************************************************/
64 static int InitThread (ac3dec_thread_t * p_adec);
65 static void RunThread (ac3dec_thread_t * p_adec);
66 static void ErrorThread (ac3dec_thread_t * p_adec);
67 static void EndThread (ac3dec_thread_t * p_adec);
68 static void BitstreamCallback ( bit_stream_t *p_bit_stream,
69 boolean_t b_new_pes );
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_t;
79 intf_DbgMsg( "ac3dec debug: creating ac3 decoder thread" );
81 /* Allocate the memory needed to store the thread's structure */
82 if((p_ac3dec_t = (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");
90 * Initialize the thread properties
92 p_ac3dec_t->p_config = p_config;
93 p_ac3dec_t->p_fifo = p_config->decoder_config.p_decoder_fifo;
95 /* Initialize the ac3 decoder structures */
96 ac3_init (&p_ac3dec_t->ac3_decoder);
99 * Initialize the output properties
101 p_ac3dec_t->p_aout_fifo = NULL;
103 /* Spawn the ac3 decoder thread */
104 if (vlc_thread_create(&p_ac3dec_t->thread_id, "ac3 decoder",
105 (vlc_thread_func_t)RunThread, (void *)p_ac3dec_t))
107 intf_ErrMsg( "ac3dec error: can't spawn ac3 decoder thread" );
112 intf_DbgMsg ("ac3dec debug: ac3 decoder thread (%p) created", p_ac3dec_t);
113 return p_ac3dec_t->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_t)
123 intf_DbgMsg("ac3dec debug: initializing ac3 decoder thread %p",p_ac3dec_t);
125 p_ac3dec_t->p_config->decoder_config.pf_init_bit_stream(
126 &p_ac3dec_t->ac3_decoder.bit_stream,
127 p_ac3dec_t->p_config->decoder_config.p_decoder_fifo,
128 BitstreamCallback, (void *) p_ac3dec_t );
130 /* Creating the audio output fifo */
131 p_ac3dec_t->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 0, 0,
132 AC3DEC_FRAME_SIZE, NULL );
133 if ( p_ac3dec_t->p_aout_fifo == NULL )
138 intf_DbgMsg("ac3dec debug: ac3 decoder thread %p initialized", p_ac3dec_t);
142 /*****************************************************************************
143 * RunThread : ac3 decoder thread
144 *****************************************************************************/
145 static void RunThread (ac3dec_thread_t * p_ac3dec_t)
149 intf_DbgMsg ("ac3dec debug: running ac3 decoder thread (%p) (pid == %i)", p_ac3dec_t, getpid());
151 /* Initializing the ac3 decoder thread */
152 if (InitThread (p_ac3dec_t)) /* XXX?? */
154 p_ac3dec_t->p_fifo->b_error = 1;
158 p_ac3dec_t->sync_ptr = 0;
160 /* ac3 decoder thread's main loop */
161 /* FIXME : do we have enough room to store the decoded frames ?? */
162 while ((!p_ac3dec_t->p_fifo->b_die) && (!p_ac3dec_t->p_fifo->b_error))
165 ac3_sync_info_t sync_info;
170 GetBits(&p_ac3dec_t->ac3_decoder.bit_stream,8);
171 } while ((!p_ac3dec_t->sync_ptr) && (!p_ac3dec_t->p_fifo->b_die)
172 && (!p_ac3dec_t->p_fifo->b_error));
174 ptr = p_ac3dec_t->sync_ptr;
176 while(ptr-- && (!p_ac3dec_t->p_fifo->b_die)
177 && (!p_ac3dec_t->p_fifo->b_error))
179 p_ac3dec_t->ac3_decoder.bit_stream.p_byte++;
182 /* we are in sync now */
186 if (DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts)
188 p_ac3dec_t->p_aout_fifo->date[p_ac3dec_t->p_aout_fifo->l_end_frame] =
189 DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts;
190 DECODER_FIFO_START(*p_ac3dec_t->p_fifo)->i_pts = 0;
192 p_ac3dec_t->p_aout_fifo->date[p_ac3dec_t->p_aout_fifo->l_end_frame] =
196 if (ac3_sync_frame (&p_ac3dec_t->ac3_decoder, &sync_info))
202 p_ac3dec_t->p_aout_fifo->l_rate = sync_info.sample_rate;
204 buffer = ((s16 *)p_ac3dec_t->p_aout_fifo->buffer) +
205 (p_ac3dec_t->p_aout_fifo->l_end_frame * AC3DEC_FRAME_SIZE);
207 if (ac3_decode_frame (&p_ac3dec_t->ac3_decoder, buffer))
213 vlc_mutex_lock (&p_ac3dec_t->p_aout_fifo->data_lock);
214 p_ac3dec_t->p_aout_fifo->l_end_frame =
215 (p_ac3dec_t->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
216 vlc_cond_signal (&p_ac3dec_t->p_aout_fifo->data_wait);
217 vlc_mutex_unlock (&p_ac3dec_t->p_aout_fifo->data_lock);
220 RealignBits(&p_ac3dec_t->ac3_decoder.bit_stream);
223 /* If b_error is set, the ac3 decoder thread enters the error loop */
224 if (p_ac3dec_t->p_fifo->b_error)
226 ErrorThread (p_ac3dec_t);
229 /* End of the ac3 decoder thread */
230 EndThread (p_ac3dec_t);
233 /*****************************************************************************
234 * ErrorThread : ac3 decoder's RunThread() error loop
235 *****************************************************************************/
236 static void ErrorThread (ac3dec_thread_t * p_ac3dec_t)
238 /* We take the lock, because we are going to read/write the start/end
239 * indexes of the decoder fifo */
240 vlc_mutex_lock (&p_ac3dec_t->p_fifo->data_lock);
242 /* Wait until a `die' order is sent */
243 while (!p_ac3dec_t->p_fifo->b_die)
245 /* Trash all received PES packets */
246 while (!DECODER_FIFO_ISEMPTY(*p_ac3dec_t->p_fifo))
248 p_ac3dec_t->p_fifo->pf_delete_pes(p_ac3dec_t->p_fifo->p_packets_mgt,
249 DECODER_FIFO_START(*p_ac3dec_t->p_fifo));
250 DECODER_FIFO_INCSTART (*p_ac3dec_t->p_fifo);
253 /* Waiting for the input thread to put new PES packets in the fifo */
254 vlc_cond_wait (&p_ac3dec_t->p_fifo->data_wait,
255 &p_ac3dec_t->p_fifo->data_lock);
258 /* We can release the lock before leaving */
259 vlc_mutex_unlock (&p_ac3dec_t->p_fifo->data_lock);
262 /*****************************************************************************
263 * EndThread : ac3 decoder thread destruction
264 *****************************************************************************/
265 static void EndThread (ac3dec_thread_t * p_ac3dec_t)
267 intf_DbgMsg ("ac3dec debug: destroying ac3 decoder thread %p", p_ac3dec_t);
269 /* If the audio output fifo was created, we destroy it */
270 if (p_ac3dec_t->p_aout_fifo != NULL)
272 aout_DestroyFifo (p_ac3dec_t->p_aout_fifo);
274 /* Make sure the output thread leaves the NextFrame() function */
275 vlc_mutex_lock (&(p_ac3dec_t->p_aout_fifo->data_lock));
276 vlc_cond_signal (&(p_ac3dec_t->p_aout_fifo->data_wait));
277 vlc_mutex_unlock (&(p_ac3dec_t->p_aout_fifo->data_lock));
281 /* Destroy descriptor */
282 free( p_ac3dec_t->p_config );
285 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p destroyed", p_ac3dec_t);
288 /*****************************************************************************
289 * BitstreamCallback: Import parameters from the new data/PES packet
290 *****************************************************************************
291 * This function is called by input's NextDataPacket.
292 *****************************************************************************/
293 static void BitstreamCallback ( bit_stream_t * p_bit_stream,
297 ac3dec_thread_t *p_ac3dec_t=(ac3dec_thread_t *)p_bit_stream->p_callback_arg;
303 ptr = *(p_bit_stream->p_byte + 1);
305 ptr |= *(p_bit_stream->p_byte + 2);
306 p_ac3dec_t->sync_ptr = ptr;
307 p_bit_stream->p_byte += 3;