mirror of
https://code.videolan.org/videolan/vlc
synced 2024-10-03 01:31:53 +02:00
d198a80352
* First hooks for changing the audio output plug-in and its parameters on-the-fly.
119 lines
4.4 KiB
C
119 lines
4.4 KiB
C
/*****************************************************************************
|
|
* trivial.c : trivial mixer plug-in (1 input, no downmixing)
|
|
*****************************************************************************
|
|
* Copyright (C) 2002 VideoLAN
|
|
* $Id: trivial.c,v 1.7 2002/09/20 23:27:03 massiot Exp $
|
|
*
|
|
* 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 <errno.h>
|
|
#include <stdlib.h> /* malloc(), free() */
|
|
#include <string.h>
|
|
|
|
#include <vlc/vlc.h>
|
|
#include "audio_output.h"
|
|
#include "aout_internal.h"
|
|
|
|
/*****************************************************************************
|
|
* Local prototypes
|
|
*****************************************************************************/
|
|
static int Create ( vlc_object_t * );
|
|
|
|
static void DoWork ( aout_instance_t *, aout_buffer_t * );
|
|
|
|
/*****************************************************************************
|
|
* Module descriptor
|
|
*****************************************************************************/
|
|
vlc_module_begin();
|
|
set_description( _("trivial audio mixer module") );
|
|
set_capability( "audio mixer", 1 );
|
|
set_callbacks( Create, NULL );
|
|
vlc_module_end();
|
|
|
|
/*****************************************************************************
|
|
* Create: allocate trivial mixer
|
|
*****************************************************************************/
|
|
static int Create( vlc_object_t *p_this )
|
|
{
|
|
aout_instance_t * p_aout = (aout_instance_t *)p_this;
|
|
|
|
if ( p_aout->mixer.mixer.i_format != AOUT_FMT_FLOAT32
|
|
&& p_aout->mixer.mixer.i_format != AOUT_FMT_FIXED32 )
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
p_aout->mixer.pf_do_work = DoWork;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DoWork: mix a new output buffer
|
|
*****************************************************************************/
|
|
static void DoWork( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
|
|
{
|
|
aout_input_t * p_input = p_aout->pp_inputs[0];
|
|
int i_nb_bytes = p_buffer->i_nb_samples * sizeof(s32)
|
|
* p_aout->mixer.mixer.i_channels;
|
|
byte_t * p_in = p_input->p_first_byte_to_mix;
|
|
byte_t * p_out = p_buffer->p_buffer;
|
|
|
|
if ( p_input->b_error ) return;
|
|
|
|
for ( ; ; )
|
|
{
|
|
ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
|
|
- p_in)
|
|
+ p_input->fifo.p_first->i_nb_samples
|
|
* sizeof(s32)
|
|
* p_aout->mixer.mixer.i_channels;
|
|
|
|
if ( i_available_bytes < i_nb_bytes )
|
|
{
|
|
aout_buffer_t * p_old_buffer;
|
|
|
|
if ( i_available_bytes > 0 )
|
|
p_aout->p_vlc->pf_memcpy( p_out, p_in, i_available_bytes );
|
|
i_nb_bytes -= i_available_bytes;
|
|
p_out += i_available_bytes;
|
|
|
|
/* Next buffer */
|
|
p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
|
|
aout_BufferFree( p_old_buffer );
|
|
if ( p_input->fifo.p_first == NULL )
|
|
{
|
|
msg_Err( p_aout, "internal amix error" );
|
|
return;
|
|
}
|
|
p_in = p_input->fifo.p_first->p_buffer;
|
|
}
|
|
else
|
|
{
|
|
if ( i_nb_bytes > 0 )
|
|
p_aout->p_vlc->pf_memcpy( p_out, p_in, i_nb_bytes );
|
|
p_input->p_first_byte_to_mix = p_in + i_nb_bytes;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|