/***************************************************************************** * mpeg_adec.c: MPEG audio decoder thread ***************************************************************************** * Copyright (C) 1999-2001 VideoLAN * $Id: mpeg_adec.c,v 1.20 2002/02/24 20:51:10 gbazin Exp $ * * Authors: Michel Kaempf * Michel Lespinasse * Samuel Hocevar * Cyril Deguet * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #include /* malloc(), free() */ #include #include #include "audio_output.h" /* aout_fifo_t (for audio_decoder.h) */ #include "stream_control.h" #include "input_ext-dec.h" #include "mpeg_adec_generic.h" #include "mpeg_adec.h" #define ADEC_FRAME_SIZE (2*1152) /***************************************************************************** * Local Prototypes *****************************************************************************/ static int decoder_Probe ( u8 * ); static int decoder_Run ( decoder_config_t * ); static void EndThread ( adec_thread_t * ); static void DecodeThread ( adec_thread_t * ); /***************************************************************************** * Capabilities *****************************************************************************/ void _M( adec_getfunctions )( function_list_t * p_function_list ) { p_function_list->functions.dec.pf_probe = decoder_Probe; p_function_list->functions.dec.pf_run = decoder_Run; } /***************************************************************************** * Build configuration tree. *****************************************************************************/ MODULE_CONFIG_START MODULE_CONFIG_STOP MODULE_INIT_START SET_DESCRIPTION( "Mpeg I layer 1/2 audio decoder" ) ADD_CAPABILITY( DECODER, 100 ) ADD_REQUIREMENT( FPU ) ADD_SHORTCUT( "builtin" ) MODULE_INIT_STOP MODULE_ACTIVATE_START _M( adec_getfunctions )( &p_module->p_functions->dec ); MODULE_ACTIVATE_STOP MODULE_DEACTIVATE_START MODULE_DEACTIVATE_STOP /***************************************************************************** * decoder_Probe: probe the decoder and return score *****************************************************************************/ static int decoder_Probe( u8 *pi_type ) { return( ( *pi_type == MPEG1_AUDIO_ES || *pi_type == MPEG2_AUDIO_ES ) ? 0 : -1 ); } /***************************************************************************** * decoder_Run: initialize, go inside main loop, detroy *****************************************************************************/ static int decoder_Run ( decoder_config_t * p_config ) { adec_thread_t * p_adec; /* Allocate the memory needed to store the thread's structure */ if ( (p_adec = (adec_thread_t *)malloc (sizeof(adec_thread_t))) == NULL ) { intf_ErrMsg ( "adec error: not enough memory for" " adec_CreateThread() to create the new thread" ); DecoderError( p_config->p_decoder_fifo ); return 0; } /* * Initialize the thread properties */ p_adec->p_config = p_config; p_adec->p_fifo = p_config->p_decoder_fifo; /* * Initilize the banks */ p_adec->bank_0.actual = p_adec->bank_0.v1; p_adec->bank_0.pos = 0; p_adec->bank_1.actual = p_adec->bank_1.v1; p_adec->bank_1.pos = 0; /* * Initialize bit stream */ InitBitstream( &p_adec->bit_stream, p_adec->p_config->p_decoder_fifo, NULL, NULL ); /* We do not create the audio output fifo now, but it will be created when the first frame is received */ p_adec->p_aout_fifo = NULL; p_adec->i_sync = 0; /* Audio decoder thread's main loop */ while( (!p_adec->p_fifo->b_die) && (!p_adec->p_fifo->b_error) ) { DecodeThread( p_adec ); } /* If b_error is set, the audio decoder thread enters the error loop */ if( p_adec->p_fifo->b_error ) { DecoderError( p_adec->p_fifo ); } /* End of the audio decoder thread */ EndThread( p_adec ); return( 0 ); } /* * Following functions are local to this module */ /***************************************************************************** * DecodeThread: decodes a mpeg frame *****************************************************************************/ static void DecodeThread( adec_thread_t * p_adec ) { s16 * buffer; adec_sync_info_t sync_info; if( ! adec_SyncFrame (p_adec, &sync_info) ) { /* TODO: check if audio type has changed */ /* Create the output fifo if it doesn't exist yet */ if( p_adec->p_aout_fifo == NULL ) { int fifo_type; int channels; if( p_main->b_stereo ) { intf_WarnMsg( 4, "adec info: setting stereo output" ); fifo_type = AOUT_ADEC_STEREO_FIFO; channels = 2; } else if( sync_info.b_stereo ) { fifo_type = AOUT_ADEC_STEREO_FIFO; channels = 2; } else { fifo_type = AOUT_ADEC_MONO_FIFO; channels = 1; } p_adec->p_aout_fifo = aout_CreateFifo( fifo_type, channels, sync_info.sample_rate, 0, ADEC_FRAME_SIZE, NULL ); if( p_adec->p_aout_fifo == NULL) { intf_ErrMsg( "adec error: failed to create Audio Output " "Fifo." ); p_adec->p_fifo->b_error = 1; return; } } p_adec->i_sync = 1; buffer = ((s16 *)p_adec->p_aout_fifo->buffer) + (p_adec->p_aout_fifo->l_end_frame * ADEC_FRAME_SIZE); CurrentPTS( &p_adec->bit_stream, &p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame], NULL ); if( !p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] ) { p_adec->p_aout_fifo->date[p_adec->p_aout_fifo->l_end_frame] = LAST_MDATE; } if( adec_DecodeFrame (p_adec, buffer) ) { /* Ouch, failed decoding... We'll have to resync */ p_adec->i_sync = 0; } else { vlc_mutex_lock (&p_adec->p_aout_fifo->data_lock); p_adec->p_aout_fifo->l_end_frame = (p_adec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE; vlc_cond_signal (&p_adec->p_aout_fifo->data_wait); vlc_mutex_unlock (&p_adec->p_aout_fifo->data_lock); } } } /***************************************************************************** * EndThread : audio decoder thread destruction ***************************************************************************** * This function is called when the thread ends after a sucessful * initialization. *****************************************************************************/ static void EndThread ( adec_thread_t *p_adec ) { /* If the audio output fifo was created, we destroy it */ if ( p_adec->p_aout_fifo != NULL ) { aout_DestroyFifo ( p_adec->p_aout_fifo ); /* Make sure the output thread leaves the NextFrame() function */ vlc_mutex_lock (&(p_adec->p_aout_fifo->data_lock)); vlc_cond_signal (&(p_adec->p_aout_fifo->data_wait)); vlc_mutex_unlock (&(p_adec->p_aout_fifo->data_lock)); } /* Destroy descriptor */ free( p_adec ); }