1 /*****************************************************************************
2 * audio_decoder.c: MPEG audio decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: audio_decoder.c,v 1.46 2001/01/11 17:44:48 sam 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"
87 " adec_CreateThread() to create the new thread" );
92 * Initialize the thread properties
94 p_adec->p_config = p_config;
95 p_adec->p_fifo = p_config->decoder_config.p_decoder_fifo;
98 * Initialize the decoder properties
100 adec_Init ( p_adec );
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",
110 (vlc_thread_func_t)RunThread, (void *)p_adec) )
112 intf_ErrMsg ("adec error: can't spawn audio decoder thread");
117 intf_DbgMsg ("adec debug: audio decoder thread (%p) created", p_adec);
118 return p_adec->thread_id;
121 /* following functions are local */
123 /*****************************************************************************
124 * InitThread : initialize an audio decoder thread
125 *****************************************************************************
126 * This function is called from RunThread and performs the second step of the
127 * initialization. It returns 0 on success.
128 *****************************************************************************/
129 static int InitThread (adec_thread_t * p_adec)
131 aout_fifo_t aout_fifo;
133 intf_DbgMsg ("adec debug: initializing audio decoder thread %p", p_adec);
135 p_adec->p_config->decoder_config.pf_init_bit_stream( &p_adec->bit_stream,
136 p_adec->p_config->decoder_config.p_decoder_fifo );
138 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
139 aout_fifo.i_channels = 2;
140 aout_fifo.b_stereo = 1;
141 aout_fifo.l_frame_size = ADEC_FRAME_SIZE;
143 /* Creating the audio output fifo */
144 if ( (p_adec->p_aout_fifo =
145 aout_CreateFifo(p_adec->p_aout, &aout_fifo)) == NULL )
150 intf_DbgMsg ( "adec debug: audio decoder thread %p initialized", p_adec );
154 /*****************************************************************************
155 * RunThread : audio decoder thread
156 *****************************************************************************
157 * Audio decoder thread. This function does only returns when the thread is
159 *****************************************************************************/
160 static void RunThread (adec_thread_t * p_adec)
164 intf_DbgMsg ( "adec debug: running audio decoder thread (%p) (pid == %i)",
167 /* You really suck */
168 //msleep ( INPUT_PTS_DELAY );
170 /* Initializing the audio decoder thread */
171 p_adec->p_fifo->b_error = InitThread (p_adec);
175 /* Audio decoder thread's main loop */
176 while( (!p_adec->p_fifo->b_die) && (!p_adec->p_fifo->b_error) )
179 adec_sync_info_t sync_info;
181 if( DECODER_FIFO_START( *p_adec->p_fifo)->i_pts )
183 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
184 DECODER_FIFO_START( *p_adec->p_fifo )->i_pts;
185 DECODER_FIFO_START(*p_adec->p_fifo)->i_pts = 0;
189 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
193 if( ! adec_SyncFrame (p_adec, &sync_info) )
197 p_adec->p_aout_fifo->l_rate = sync_info.sample_rate;
199 buffer = ((s16 *)p_adec->p_aout_fifo->buffer)
200 + (p_adec->p_aout_fifo->l_end_frame * ADEC_FRAME_SIZE);
202 if( adec_DecodeFrame (p_adec, buffer) )
204 /* Ouch, failed decoding... We'll have to resync */
209 vlc_mutex_lock (&p_adec->p_aout_fifo->data_lock);
211 p_adec->p_aout_fifo->l_end_frame =
212 (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
213 vlc_cond_signal (&p_adec->p_aout_fifo->data_wait);
214 vlc_mutex_unlock (&p_adec->p_aout_fifo->data_lock);
219 /* If b_error is set, the audio decoder thread enters the error loop */
220 if( p_adec->p_fifo->b_error )
222 ErrorThread( p_adec );
225 /* End of the audio decoder thread */
229 /*****************************************************************************
230 * ErrorThread : audio decoder's RunThread() error loop
231 *****************************************************************************
232 * This function is called when an error occured during thread main's loop. The
233 * thread can still receive feed, but must be ready to terminate as soon as
235 *****************************************************************************/
236 static void ErrorThread ( adec_thread_t *p_adec )
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_adec->p_fifo->data_lock );
242 /* Wait until a `die' order is sent */
243 while ( !p_adec->p_fifo->b_die )
245 /* Trash all received PES packets */
246 while ( !DECODER_FIFO_ISEMPTY(*p_adec->p_fifo) )
248 p_adec->p_fifo->pf_delete_pes ( p_adec->p_fifo->p_packets_mgt,
249 DECODER_FIFO_START(*p_adec->p_fifo) );
250 DECODER_FIFO_INCSTART ( *p_adec->p_fifo );
253 /* Waiting for the input thread to put new PES packets in the fifo */
254 vlc_cond_wait ( &p_adec->p_fifo->data_wait, &p_adec->p_fifo->data_lock );
257 /* We can release the lock before leaving */
258 vlc_mutex_unlock ( &p_adec->p_fifo->data_lock );
261 /*****************************************************************************
262 * EndThread : audio decoder thread destruction
263 *****************************************************************************
264 * This function is called when the thread ends after a sucessful
266 *****************************************************************************/
267 static void EndThread ( adec_thread_t *p_adec )
269 intf_DbgMsg ( "adec debug: destroying audio decoder thread %p", p_adec );
271 /* If the audio output fifo was created, we destroy it */
272 if ( p_adec->p_aout_fifo != NULL )
274 aout_DestroyFifo ( p_adec->p_aout_fifo );
276 /* Make sure the output thread leaves the NextFrame() function */
277 vlc_mutex_lock (&(p_adec->p_aout_fifo->data_lock));
278 vlc_cond_signal (&(p_adec->p_aout_fifo->data_wait));
279 vlc_mutex_unlock (&(p_adec->p_aout_fifo->data_lock));
281 /* Destroy descriptor */
282 free( p_adec->p_config );
285 intf_DbgMsg ("adec debug: audio decoder thread %p destroyed", p_adec);