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https://code.videolan.org/videolan/vlc
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1c13a98745
* Audio and video should now _always_ be perfectly in sync. * Changes in a52.c (end_date management) must be ported to other codecs, otherwise mixer errors will appear. * Audio output plug-in can now tell whether they can handle a little clock drift (for instance, inserting zeroes after a pause).
117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/*****************************************************************************
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* trivial.c : trivial mixer plug-in (1 input, no downmixing)
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*****************************************************************************
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* Copyright (C) 2002 VideoLAN
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* $Id: trivial.c,v 1.6 2002/08/21 22:41:59 massiot Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <errno.h>
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h>
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#include <vlc/vlc.h>
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#include "audio_output.h"
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#include "aout_internal.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Create ( vlc_object_t * );
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static void DoWork ( aout_instance_t *, aout_buffer_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("trivial audio mixer module") );
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set_capability( "audio mixer", 1 );
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set_callbacks( Create, NULL );
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vlc_module_end();
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/*****************************************************************************
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* Create: allocate trivial mixer
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*****************************************************************************/
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static int Create( vlc_object_t *p_this )
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{
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aout_instance_t * p_aout = (aout_instance_t *)p_this;
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if ( p_aout->mixer.mixer.i_format != AOUT_FMT_FLOAT32
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&& p_aout->mixer.mixer.i_format != AOUT_FMT_FIXED32 )
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{
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return -1;
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}
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p_aout->mixer.pf_do_work = DoWork;
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return 0;
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}
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/*****************************************************************************
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* DoWork: mix a new output buffer
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*****************************************************************************/
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static void DoWork( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
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{
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aout_input_t * p_input = p_aout->pp_inputs[0];
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int i_nb_bytes = p_buffer->i_nb_samples * sizeof(s32)
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* p_aout->mixer.mixer.i_channels;
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byte_t * p_in = p_input->p_first_byte_to_mix;
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byte_t * p_out = p_buffer->p_buffer;
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for ( ; ; )
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{
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ptrdiff_t i_available_bytes = (p_input->fifo.p_first->p_buffer
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- p_in)
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+ p_input->fifo.p_first->i_nb_samples
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* sizeof(s32)
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* p_aout->mixer.mixer.i_channels;
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if ( i_available_bytes < i_nb_bytes )
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{
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aout_buffer_t * p_old_buffer;
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if ( i_available_bytes > 0 )
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p_aout->p_vlc->pf_memcpy( p_out, p_in, i_available_bytes );
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i_nb_bytes -= i_available_bytes;
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p_out += i_available_bytes;
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/* Next buffer */
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p_old_buffer = aout_FifoPop( p_aout, &p_input->fifo );
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aout_BufferFree( p_old_buffer );
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if ( p_input->fifo.p_first == NULL )
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{
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msg_Err( p_aout, "internal amix error" );
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return;
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}
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p_in = p_input->fifo.p_first->p_buffer;
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}
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else
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{
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if ( i_nb_bytes > 0 )
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p_aout->p_vlc->pf_memcpy( p_out, p_in, i_nb_bytes );
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p_input->p_first_byte_to_mix = p_in + i_nb_bytes;
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break;
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}
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}
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}
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