aout.c
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上传日期:2009-03-27
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- /*****************************************************************************
- * aout_dummy.c : dummy audio output plugin
- *****************************************************************************
- * Copyright (C) 2002 VideoLAN
- * $Id: aout.c 6961 2004-03-05 17:34:23Z sam $
- *
- * Authors: Christophe Massiot <massiot@via.ecp.fr>
- *
- * 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 <string.h>
- #include <stdlib.h>
- #include <vlc/vlc.h>
- #include <vlc/aout.h>
- #include "aout_internal.h"
- #define FRAME_SIZE 2048
- #define A52_FRAME_NB 1536
- /*****************************************************************************
- * Local prototypes.
- *****************************************************************************/
- static void Play ( aout_instance_t * );
- /*****************************************************************************
- * OpenAudio: open a dummy audio device
- *****************************************************************************/
- int E_(OpenAudio) ( vlc_object_t * p_this )
- {
- aout_instance_t * p_aout = (aout_instance_t *)p_this;
- p_aout->output.pf_play = Play;
- aout_VolumeSoftInit( p_aout );
- if ( p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i') )
- {
- p_aout->output.i_nb_samples = A52_FRAME_NB;
- p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
- p_aout->output.output.i_frame_length = A52_FRAME_NB;
- }
- else
- {
- p_aout->output.i_nb_samples = FRAME_SIZE;
- }
- return 0;
- }
- /*****************************************************************************
- * Play: pretend to play a sound
- *****************************************************************************/
- static void Play( aout_instance_t * p_aout )
- {
- aout_buffer_t * p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
- aout_BufferFree( p_buffer );
- }