1 /***************************************************************************
2 mad_adec.c - description
4 Plugin Module definition for using libmad audio decoder in vlc. The
5 libmad codec uses integer arithmic only. This makes it suitable for using
6 it on architectures without a hardware FPU unit, such as the StrongArm
10 copyright : (C) 2001 by Jean-Paul Saman
11 email : jpsaman@wxs.nl
12 ***************************************************************************/
14 /***************************************************************************
16 * This program is free software; you can redistribute it and/or modify *
17 * it under the terms of the GNU General Public License as published by *
18 * the Free Software Foundation; either version 2 of the License, or *
19 * (at your option) any later version. *
21 ***************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
26 #include <stdlib.h> /* malloc(), free() */
27 #include <string.h> /* strdup() */
29 #include <videolan/vlc.h>
31 #include "audio_output.h"
33 #include "stream_control.h"
34 #include "input_ext-dec.h"
36 /*****************************************************************************
37 * Libmad include files *
38 *****************************************************************************/
41 #include "mad_libmad.h"
43 /*****************************************************************************
45 *****************************************************************************/
46 static int decoder_Probe ( u8 * );
47 static int decoder_Run ( decoder_config_t * );
48 static int InitThread ( mad_adec_thread_t * p_mad_adec );
49 static void EndThread ( mad_adec_thread_t * p_mad_adec );
51 /*****************************************************************************
53 *****************************************************************************/
54 void _M( adec_getfunctions )( function_list_t * p_function_list )
56 p_function_list->functions.dec.pf_probe = decoder_Probe;
57 p_function_list->functions.dec.pf_run = decoder_Run;
60 /*****************************************************************************
61 * Build configuration tree.
62 *****************************************************************************/
67 SET_DESCRIPTION( _("libmad MPEG 1/2/3 audio decoder library") )
68 ADD_CAPABILITY( DECODER, 100 )
73 _M( adec_getfunctions )( &p_module->p_functions->dec );
76 MODULE_DEACTIVATE_START
77 MODULE_DEACTIVATE_STOP
79 /*****************************************************************************
80 * decoder_Probe: probe the decoder and return score
81 *****************************************************************************
82 * Tries to launch a decoder and return score so that the interface is able
84 *****************************************************************************/
85 static int decoder_Probe( u8 *pi_type )
87 if( *pi_type == MPEG1_AUDIO_ES || *pi_type == MPEG2_AUDIO_ES )
95 /*****************************************************************************
96 * decoder_Run: this function is called just after the thread is created
97 *****************************************************************************/
98 static int decoder_Run ( decoder_config_t * p_config )
100 mad_adec_thread_t * p_mad_adec;
102 intf_ErrMsg( "mad_adec debug: mad_adec thread launched, initializing" );
104 /* Allocate the memory needed to store the thread's structure */
105 p_mad_adec = (mad_adec_thread_t *) malloc(sizeof(mad_adec_thread_t));
107 if (p_mad_adec == NULL)
109 intf_ErrMsg ( "mad_adec error: not enough memory "
110 "for decoder_Run() to allocate p_mad_adec" );
111 DecoderError( p_config->p_decoder_fifo );
116 * Initialize the thread properties
118 p_mad_adec->p_config = p_config;
119 p_mad_adec->p_fifo = p_mad_adec->p_config->p_decoder_fifo;
120 if( InitThread( p_mad_adec ) )
122 intf_ErrMsg( "mad_adec error: could not initialize thread" );
123 DecoderError( p_config->p_decoder_fifo );
128 /* mad decoder thread's main loop */
129 while ((!p_mad_adec->p_fifo->b_die) && (!p_mad_adec->p_fifo->b_error))
131 intf_ErrMsg( "mad_adec: starting libmad decoder" );
132 if (mad_decoder_run(p_mad_adec->libmad_decoder, MAD_DECODER_MODE_SYNC)==-1)
134 intf_ErrMsg( "mad_adec error: libmad decoder returns abnormally");
135 DecoderError( p_mad_adec->p_fifo );
136 EndThread(p_mad_adec);
141 /* If b_error is set, the mad decoder thread enters the error loop */
142 if (p_mad_adec->p_fifo->b_error)
144 DecoderError( p_mad_adec->p_fifo );
147 /* End of the mad decoder thread */
148 EndThread (p_mad_adec);
153 /*****************************************************************************
154 * InitThread: initialize data before entering main loop
155 *****************************************************************************/
156 static int InitThread( mad_adec_thread_t * p_mad_adec )
158 decoder_fifo_t * p_fifo = p_mad_adec->p_fifo;
161 * Properties of audio for libmad
164 /* Initialize the libmad decoder structures */
165 p_mad_adec->libmad_decoder = (struct mad_decoder*) malloc(sizeof(struct mad_decoder));
166 if (p_mad_adec->libmad_decoder == NULL)
168 intf_ErrMsg ( "mad_adec error: not enough memory "
169 "for decoder_InitThread() to allocate p_mad_adec->libmad_decder" );
172 p_mad_adec->i_current_pts = p_mad_adec->i_next_pts = 0;
174 mad_decoder_init( p_mad_adec->libmad_decoder,
175 p_mad_adec, /* vlc's thread structure and p_fifo playbuffer */
176 libmad_input, /* input_func */
179 libmad_output, /* output_func */
183 mad_decoder_options(p_mad_adec->libmad_decoder, MAD_OPTION_IGNORECRC);
184 mad_timer_reset(&p_mad_adec->libmad_timer);
187 * Initialize the output properties
189 p_mad_adec->p_aout_fifo = NULL;
192 * Initialize the input properties
194 /* Get the first data packet. */
195 vlc_mutex_lock( &p_fifo->data_lock );
196 while ( p_fifo->p_first == NULL )
200 vlc_mutex_unlock( &p_fifo->data_lock );
203 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
205 vlc_mutex_unlock( &p_fifo->data_lock );
206 p_mad_adec->p_data = p_fifo->p_first->p_first;
208 intf_ErrMsg("mad_adec debug: mad decoder thread %p initialized", p_mad_adec);
213 /*****************************************************************************
214 * EndThread : libmad decoder thread destruction
215 *****************************************************************************/
216 static void EndThread (mad_adec_thread_t * p_mad_adec)
218 intf_ErrMsg ("mad_adec debug: destroying mad decoder thread %p", p_mad_adec);
220 /* If the audio output fifo was created, we destroy it */
221 if (p_mad_adec->p_aout_fifo != NULL)
223 aout_DestroyFifo (p_mad_adec->p_aout_fifo);
225 /* Make sure the output thread leaves the NextFrame() function */
226 vlc_mutex_lock (&(p_mad_adec->p_aout_fifo->data_lock));
227 vlc_cond_signal (&(p_mad_adec->p_aout_fifo->data_wait));
228 vlc_mutex_unlock (&(p_mad_adec->p_aout_fifo->data_lock));
231 /* mad_decoder_finish releases the memory allocated inside the struct */
232 mad_decoder_finish( p_mad_adec->libmad_decoder );
234 /* Unlock the modules, p_mad_adec->p_config is released by the decoder subsystem */
235 free( p_mad_adec->libmad_decoder );
238 intf_ErrMsg ("mad_adec debug: mad decoder thread %p destroyed", p_mad_adec);