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 *****************************************************************************/
63 #define DOWNSCALE_TEXT N_("Mad audio downscale routine (fast,mp321)")
64 #define DOWNSCALE_LONGTEXT N_( \
65 "Specify the mad audio downscale routine you want to use.\nBy default mad plugins will " \
66 "use the fastest routine.")
69 ADD_CATEGORY_HINT( N_("Miscellaneous"), NULL )
70 ADD_STRING ( "downscale", "fast", NULL, DOWNSCALE_TEXT, DOWNSCALE_LONGTEXT )
74 SET_DESCRIPTION( _("libmad MPEG 1/2/3 audio decoder library") )
75 ADD_CAPABILITY( DECODER, 100 )
80 _M( adec_getfunctions )( &p_module->p_functions->dec );
83 MODULE_DEACTIVATE_START
84 MODULE_DEACTIVATE_STOP
86 /*****************************************************************************
87 * decoder_Probe: probe the decoder and return score
88 *****************************************************************************
89 * Tries to launch a decoder and return score so that the interface is able
91 *****************************************************************************/
92 static int decoder_Probe( u8 *pi_type )
94 if( *pi_type == MPEG1_AUDIO_ES || *pi_type == MPEG2_AUDIO_ES )
102 /*****************************************************************************
103 * decoder_Run: this function is called just after the thread is created
104 *****************************************************************************/
105 static int decoder_Run ( decoder_config_t * p_config )
107 mad_adec_thread_t * p_mad_adec;
109 intf_WarnMsg( 4, "mad_adec debug: mad_adec thread launched, initializing" );
111 /* Allocate the memory needed to store the thread's structure */
112 p_mad_adec = (mad_adec_thread_t *) malloc(sizeof(mad_adec_thread_t));
114 if (p_mad_adec == NULL)
116 intf_ErrMsg ( "mad_adec error: not enough memory "
117 "for decoder_Run() to allocate p_mad_adec" );
118 DecoderError( p_config->p_decoder_fifo );
123 * Initialize the thread properties
125 p_mad_adec->p_config = p_config;
126 p_mad_adec->p_fifo = p_mad_adec->p_config->p_decoder_fifo;
127 if( InitThread( p_mad_adec ) )
129 intf_ErrMsg( "mad_adec error: could not initialize thread" );
130 DecoderError( p_config->p_decoder_fifo );
135 /* mad decoder thread's main loop */
136 while ((!p_mad_adec->p_fifo->b_die) && (!p_mad_adec->p_fifo->b_error))
138 intf_ErrMsg( "mad_adec: starting libmad decoder" );
139 if (mad_decoder_run(p_mad_adec->libmad_decoder, MAD_DECODER_MODE_SYNC)==-1)
141 intf_ErrMsg( "mad_adec error: libmad decoder returns abnormally");
142 DecoderError( p_mad_adec->p_fifo );
143 EndThread(p_mad_adec);
148 /* If b_error is set, the mad decoder thread enters the error loop */
149 if (p_mad_adec->p_fifo->b_error)
151 DecoderError( p_mad_adec->p_fifo );
154 /* End of the mad decoder thread */
155 EndThread (p_mad_adec);
160 /*****************************************************************************
161 * InitThread: initialize data before entering main loop
162 *****************************************************************************/
163 static int InitThread( mad_adec_thread_t * p_mad_adec )
165 decoder_fifo_t * p_fifo = p_mad_adec->p_fifo;
166 char *psz_downscale = NULL;
169 * Properties of audio for libmad
172 /* Look what scaling method was requested by the user */
173 psz_downscale = config_GetPszVariable( "downscale" );
175 if ( strncmp(psz_downscale,"fast",4)==0 )
177 p_mad_adec->audio_scaling = FAST_SCALING;
178 intf_WarnMsg( 4, "mad_adec debug: downscale fast selected" );
180 else if ( strncmp(psz_downscale,"mpg321",7)==0 )
182 p_mad_adec->audio_scaling = MPG321_SCALING;
183 intf_WarnMsg( 4, "mad_adec debug: downscale mpg321 selected" );
187 p_mad_adec->audio_scaling = FAST_SCALING;
188 intf_WarnMsg( 4, "mad_adec debug: downscale default fast selected" );
191 if (psz_downscale) free(psz_downscale);
193 /* Initialize the libmad decoder structures */
194 p_mad_adec->libmad_decoder = (struct mad_decoder*) malloc(sizeof(struct mad_decoder));
195 if (p_mad_adec->libmad_decoder == NULL)
197 intf_ErrMsg ( "mad_adec error: not enough memory "
198 "for decoder_InitThread() to allocate p_mad_adec->libmad_decder" );
201 p_mad_adec->i_current_pts = p_mad_adec->i_next_pts = 0;
203 mad_decoder_init( p_mad_adec->libmad_decoder,
204 p_mad_adec, /* vlc's thread structure and p_fifo playbuffer */
205 libmad_input, /* input_func */
208 libmad_output, /* output_func */
212 mad_decoder_options(p_mad_adec->libmad_decoder, MAD_OPTION_IGNORECRC);
213 // mad_timer_reset(&p_mad_adec->libmad_timer);
216 * Initialize the output properties
218 p_mad_adec->p_aout_fifo = NULL;
221 * Initialize the input properties
223 /* Get the first data packet. */
224 vlc_mutex_lock( &p_fifo->data_lock );
225 while ( p_fifo->p_first == NULL )
229 vlc_mutex_unlock( &p_fifo->data_lock );
232 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
234 vlc_mutex_unlock( &p_fifo->data_lock );
235 p_mad_adec->p_data = p_fifo->p_first->p_first;
237 intf_WarnMsg( 4, "mad_adec debug: mad decoder thread %p initialized", p_mad_adec);
242 /*****************************************************************************
243 * EndThread : libmad decoder thread destruction
244 *****************************************************************************/
245 static void EndThread (mad_adec_thread_t * p_mad_adec)
247 intf_WarnMsg( 4, "mad_adec debug: destroying mad decoder thread %p", p_mad_adec);
249 /* If the audio output fifo was created, we destroy it */
250 if (p_mad_adec->p_aout_fifo != NULL)
252 aout_DestroyFifo (p_mad_adec->p_aout_fifo);
254 /* Make sure the output thread leaves the NextFrame() function */
255 vlc_mutex_lock (&(p_mad_adec->p_aout_fifo->data_lock));
256 vlc_cond_signal (&(p_mad_adec->p_aout_fifo->data_wait));
257 vlc_mutex_unlock (&(p_mad_adec->p_aout_fifo->data_lock));
260 /* mad_decoder_finish releases the memory allocated inside the struct */
261 mad_decoder_finish( p_mad_adec->libmad_decoder );
263 /* Unlock the modules, p_mad_adec->p_config is released by the decoder subsystem */
264 free( p_mad_adec->libmad_decoder );
267 intf_WarnMsg( 4, "mad_adec debug: mad decoder thread %p destroyed", p_mad_adec);