mirror of https://code.videolan.org/videolan/vlc
156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/*****************************************************************************
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* adummy.c : dummy audio output plugin
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*****************************************************************************
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* Copyright (C) 2002 VLC authors and VideoLAN
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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 it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_aout.h>
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#include <vlc_cpu.h>
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static int Open(vlc_object_t *);
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static void Close(vlc_object_t *);
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vlc_module_begin ()
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set_shortname( N_("Dummy") )
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set_description( N_("Dummy audio output") )
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set_capability( "audio output", 0 )
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set_callbacks( Open, Close )
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add_shortcut( "dummy" )
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vlc_module_end ()
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#define A52_FRAME_NB 1536
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struct aout_sys
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{
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vlc_tick_t first_play_date;
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vlc_tick_t length;
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};
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static int TimeGet(audio_output_t *aout, vlc_tick_t *restrict delay)
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{
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struct aout_sys *sys = aout->sys;
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if (unlikely(sys->first_play_date == VLC_TICK_INVALID))
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{
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*delay = 0;
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return 0;
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}
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vlc_tick_t time_since_first_play = vlc_tick_now() - sys->first_play_date;
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assert(time_since_first_play >= 0);
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if (likely(sys->length > time_since_first_play))
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{
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*delay = sys->length - time_since_first_play;
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return 0;
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}
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msg_Warn(aout, "underflow");
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return -1;
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}
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static void Play(audio_output_t *aout, block_t *block, vlc_tick_t date)
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{
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struct aout_sys *sys = aout->sys;
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if (unlikely(sys->first_play_date == VLC_TICK_INVALID))
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sys->first_play_date = vlc_tick_now();
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sys->length += block->i_length;
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block_Release( block );
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(void) date;
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}
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static void Pause(audio_output_t *aout, bool paused, vlc_tick_t date)
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{
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(void) aout; (void) paused; (void) date;
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}
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static void Flush(audio_output_t *aout)
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{
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struct aout_sys *sys = aout->sys;
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sys->first_play_date = VLC_TICK_INVALID;
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sys->length = 0;
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}
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static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
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{
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(void) aout;
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switch (fmt->i_format)
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{
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case VLC_CODEC_A52:
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case VLC_CODEC_EAC3:
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fmt->i_format = VLC_CODEC_SPDIFL;
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fmt->i_bytes_per_frame = 4;
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fmt->i_frame_length = 1;
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break;
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case VLC_CODEC_DTS:
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case VLC_CODEC_TRUEHD:
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case VLC_CODEC_MLP:
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fmt->i_format = VLC_CODEC_SPDIFL;
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fmt->i_rate = 768000;
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fmt->i_bytes_per_frame = 16;
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fmt->i_frame_length = 1;
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break;
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default:
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assert(AOUT_FMT_LINEAR(fmt));
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assert(aout_FormatNbChannels(fmt) > 0);
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fmt->i_format = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
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fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
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break;
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}
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return VLC_SUCCESS;
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}
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static void Close(vlc_object_t *obj)
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{
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audio_output_t *aout = (audio_output_t *)obj;
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free(aout->sys);
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}
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static int Open(vlc_object_t *obj)
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{
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audio_output_t *aout = (audio_output_t *)obj;
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struct aout_sys *sys = aout->sys = malloc(sizeof(*sys));
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if (!sys)
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return VLC_ENOMEM;
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sys->first_play_date = VLC_TICK_INVALID;
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sys->length = 0;
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aout->start = Start;
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aout->time_get = TimeGet;
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aout->play = Play;
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aout->pause = Pause;
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aout->flush = Flush;
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aout->stop = Flush;
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aout->volume_set = NULL;
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aout->mute_set = NULL;
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return VLC_SUCCESS;
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}
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