1 /*****************************************************************************
2 * mpeg_adec.c: MPEG audio decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: mpeg_adec.c,v 1.5.2.3 2001/12/31 03:59:59 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 *****************************************************************************/
26 #define MODULE_NAME mpeg_adec
27 #include "modules_inner.h"
29 /*****************************************************************************
31 *****************************************************************************/
34 #include <stdlib.h> /* malloc(), free() */
38 #include "common.h" /* boolean_t, byte_t */
44 #include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */
47 #include "modules_export.h"
49 #include "stream_control.h"
50 #include "input_ext-dec.h"
52 #include "mpeg_adec_generic.h"
53 #include "mpeg_adec.h"
55 #define ADEC_FRAME_SIZE (2*1152)
57 /*****************************************************************************
59 *****************************************************************************/
60 static int decoder_Probe ( probedata_t * );
61 static int decoder_Run ( decoder_config_t * );
62 static void EndThread ( adec_thread_t * );
63 static void DecodeThread ( adec_thread_t * );
66 /*****************************************************************************
68 *****************************************************************************/
69 void _M( adec_getfunctions )( function_list_t * p_function_list )
71 p_function_list->pf_probe = decoder_Probe;
72 p_function_list->functions.dec.pf_run = decoder_Run;
75 /*****************************************************************************
76 * Build configuration tree.
77 *****************************************************************************/
79 ADD_WINDOW( "Configuration for mpeg audio decoder module" )
80 ADD_COMMENT( "Nothing to configure" )
84 p_module->i_capabilities = MODULE_CAPABILITY_DEC;
85 p_module->psz_longname = "Mpeg I layer 1/2 audio decoder";
89 _M( adec_getfunctions )( &p_module->p_functions->dec );
92 MODULE_DEACTIVATE_START
93 MODULE_DEACTIVATE_STOP
95 /*****************************************************************************
96 * decoder_Probe: probe the decoder and return score
97 *****************************************************************************/
98 static int decoder_Probe( probedata_t *p_data )
100 if( p_data->i_type == MPEG1_AUDIO_ES || p_data->i_type == MPEG2_AUDIO_ES )
102 if( !TestCPU( CPU_CAPABILITY_FPU ) )
104 /* This can work but we'd really prefer libmad to take over. */
107 if( TestMethod( ADEC_MPEG_VAR, "builtin" ) )
116 /*****************************************************************************
117 * decoder_Run: initialize, go inside main loop, detroy
118 *****************************************************************************/
119 static int decoder_Run ( decoder_config_t * p_config )
121 adec_thread_t * p_adec;
123 intf_DbgMsg("mpeg_adec debug: thread launched, initializing.");
125 /* Allocate the memory needed to store the thread's structure */
126 if ( (p_adec = (adec_thread_t *)malloc (sizeof(adec_thread_t))) == NULL )
128 intf_ErrMsg ( "adec error: not enough memory for"
129 " adec_CreateThread() to create the new thread" );
130 DecoderError( p_config->p_decoder_fifo );
135 * Initialize the thread properties
137 p_adec->p_config = p_config;
138 p_adec->p_fifo = p_config->p_decoder_fifo;
141 * Initilize the banks
143 p_adec->bank_0.actual = p_adec->bank_0.v1;
144 p_adec->bank_0.pos = 0;
145 p_adec->bank_1.actual = p_adec->bank_1.v1;
146 p_adec->bank_1.pos = 0;
149 * Initialize bit stream
151 p_adec->p_config->pf_init_bit_stream( &p_adec->bit_stream,
152 p_adec->p_config->p_decoder_fifo, NULL, NULL );
154 /* Create the audio output fifo */
155 p_adec->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_STEREO_FIFO, 2, 0, 0,
156 ADEC_FRAME_SIZE, NULL );
157 if ( p_adec->p_aout_fifo == NULL )
159 intf_ErrMsg("mpeg_adec error: cannot create audio output fifo");
160 DecoderError( p_config->p_decoder_fifo );
164 intf_DbgMsg("mpeg_adec debug: thread initialized, decoding begins.");
168 /* Audio decoder thread's main loop */
169 while( (!p_adec->p_fifo->b_die) && (!p_adec->p_fifo->b_error) )
171 DecodeThread( p_adec );
174 /* If b_error is set, the audio decoder thread enters the error loop */
175 if( p_adec->p_fifo->b_error )
177 DecoderError( p_adec->p_fifo );
180 /* End of the audio decoder thread */
187 * Following finctions are local to this module
190 /*****************************************************************************
191 * DecodeThread: decodes a mpeg frame
192 *****************************************************************************/
193 static void DecodeThread( adec_thread_t * p_adec )
196 adec_sync_info_t sync_info;
198 if( ! adec_SyncFrame (p_adec, &sync_info) )
202 p_adec->p_aout_fifo->l_rate = sync_info.sample_rate;
204 buffer = ((s16 *)p_adec->p_aout_fifo->buffer)
205 + (p_adec->p_aout_fifo->l_end_frame * ADEC_FRAME_SIZE);
207 if( p_adec->p_fifo->p_first->i_pts )
209 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
210 p_adec->p_fifo->p_first->i_pts;
211 p_adec->p_fifo->p_first->i_pts = 0;
215 p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] =
219 if( adec_DecodeFrame (p_adec, buffer) )
221 /* Ouch, failed decoding... We'll have to resync */
226 vlc_mutex_lock (&p_adec->p_aout_fifo->data_lock);
228 p_adec->p_aout_fifo->l_end_frame =
229 (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
230 vlc_cond_signal (&p_adec->p_aout_fifo->data_wait);
231 vlc_mutex_unlock (&p_adec->p_aout_fifo->data_lock);
236 /*****************************************************************************
237 * EndThread : audio decoder thread destruction
238 *****************************************************************************
239 * This function is called when the thread ends after a sucessful
241 *****************************************************************************/
242 static void EndThread ( adec_thread_t *p_adec )
244 intf_DbgMsg ( "adec debug: destroying audio decoder thread %p", p_adec );
246 /* If the audio output fifo was created, we destroy it */
247 if ( p_adec->p_aout_fifo != NULL )
249 aout_DestroyFifo ( p_adec->p_aout_fifo );
251 /* Make sure the output thread leaves the NextFrame() function */
252 vlc_mutex_lock (&(p_adec->p_aout_fifo->data_lock));
253 vlc_cond_signal (&(p_adec->p_aout_fifo->data_wait));
254 vlc_mutex_unlock (&(p_adec->p_aout_fifo->data_lock));
256 /* Destroy descriptor */
259 intf_DbgMsg ("adec debug: audio decoder thread %p destroyed", p_adec);