+++ /dev/null
-/*****************************************************************************
- * sdl.c : SDL audio output plugin for vlc
- *****************************************************************************
- * Copyright (C) 2000-2002 the VideoLAN team
- * $Id$
- *
- * Authors: Michel Kaempf <maxx@via.ecp.fr>
- * Sam Hocevar <sam@zoy.org>
- * Pierre Baillet <oct@zoy.org>
- * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
-
-/*****************************************************************************
- * Preamble
- *****************************************************************************/
-#include <unistd.h> /* write(), close() */
-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#include <vlc_common.h>
-#include <vlc_plugin.h>
-#include <vlc_aout.h>
-
-#include <SDL.h>
-
-#define FRAME_SIZE 2048
-
-/*****************************************************************************
- * aout_sys_t: SDL audio output method descriptor
- *****************************************************************************
- * This structure is part of the audio output thread descriptor.
- * It describes the specific properties of an audio device.
- *****************************************************************************/
-struct aout_sys_t
-{
- mtime_t next_date;
- mtime_t buffer_time;
-};
-
-/*****************************************************************************
- * Local prototypes
- *****************************************************************************/
-static int Open ( vlc_object_t * );
-static void Close ( vlc_object_t * );
-static void Play ( audio_output_t *, block_t * );
-static void SDLCallback ( void *, uint8_t *, int );
-
-/*****************************************************************************
- * Module descriptor
- *****************************************************************************/
-vlc_module_begin ()
- set_shortname( "SDL" )
- set_description( N_("Simple DirectMedia Layer audio output") )
- set_capability( "audio output", 40 )
- set_category( CAT_AUDIO )
- set_subcategory( SUBCAT_AUDIO_AOUT )
- add_shortcut( "sdl" )
- set_callbacks( Open, Close )
-vlc_module_end ()
-
-/*****************************************************************************
- * Open: open the audio device
- *****************************************************************************/
-static int Open ( vlc_object_t *p_this )
-{
- audio_output_t *p_aout = (audio_output_t *)p_this;
- SDL_AudioSpec desired, obtained;
- int i_nb_channels;
- vlc_value_t val, text;
-
- /* Check that no one uses the DSP. */
- uint32_t i_flags = SDL_INIT_AUDIO;
- if( SDL_WasInit( i_flags ) )
- {
- return VLC_EGENERIC;
- }
-
- i_flags |= SDL_INIT_EVENTTHREAD;
-#ifndef NDEBUG
- /* In debug mode you may want vlc to dump a core instead of staying
- * stuck */
- i_flags |= SDL_INIT_NOPARACHUTE;
-#endif
-
- /* Initialize library */
- if( SDL_Init( i_flags ) < 0 )
- {
- msg_Err( p_aout, "cannot initialize SDL (%s)", SDL_GetError() );
- return VLC_EGENERIC;
- }
-
- if( var_Get( p_aout, "audio-device", &val ) != VLC_ENOVAR )
- {
- /* The user has selected an audio device. */
- if ( val.i_int == AOUT_VAR_STEREO )
- {
- p_aout->format.i_physical_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- }
- else if ( val.i_int == AOUT_VAR_MONO )
- {
- p_aout->format.i_physical_channels = AOUT_CHAN_CENTER;
- }
- }
-
- i_nb_channels = aout_FormatNbChannels( &p_aout->format );
- if ( i_nb_channels > 2 )
- {
- /* SDL doesn't support more than two channels. */
- i_nb_channels = 2;
- p_aout->format.i_physical_channels
- = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
- }
- desired.freq = p_aout->format.i_rate;
- desired.format = AUDIO_S16SYS;
- desired.channels = i_nb_channels;
- desired.callback = SDLCallback;
- desired.userdata = p_aout;
- desired.samples = FRAME_SIZE;
-
- /* Open the sound device. */
- if( SDL_OpenAudio( &desired, &obtained ) < 0 )
- {
- return VLC_EGENERIC;
- }
-
- SDL_PauseAudio( 0 );
-
- /* Now have a look at what we got. */
- switch ( obtained.format )
- {
- case AUDIO_S16LSB:
- p_aout->format.i_format = VLC_CODEC_S16L; break;
- case AUDIO_S16MSB:
- p_aout->format.i_format = VLC_CODEC_S16B; break;
- case AUDIO_U16LSB:
- p_aout->format.i_format = VLC_CODEC_U16L; break;
- case AUDIO_U16MSB:
- p_aout->format.i_format = VLC_CODEC_U16B; break;
- case AUDIO_S8:
- p_aout->format.i_format = VLC_CODEC_S8; break;
- case AUDIO_U8:
- p_aout->format.i_format = VLC_CODEC_U8; break;
- }
- /* Volume is entirely done in software. */
- aout_VolumeSoftInit( p_aout );
-
- if ( obtained.channels != i_nb_channels )
- {
- p_aout->format.i_physical_channels = (obtained.channels == 2 ?
- AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT :
- AOUT_CHAN_CENTER);
-
- if ( var_Type( p_aout, "audio-device" ) == 0 )
- {
- var_Create( p_aout, "audio-device",
- VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
- text.psz_string = _("Audio Device");
- var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
-
- val.i_int = (obtained.channels == 2) ? AOUT_VAR_STEREO :
- AOUT_VAR_MONO;
- text.psz_string = (obtained.channels == 2) ? _("Stereo") :
- _("Mono");
- var_Change( p_aout, "audio-device",
- VLC_VAR_ADDCHOICE, &val, &text );
- var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart,
- NULL );
- }
- }
- else if ( var_Type( p_aout, "audio-device" ) == 0 )
- {
- /* First launch. */
- var_Create( p_aout, "audio-device",
- VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
- text.psz_string = _("Audio Device");
- var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
-
- val.i_int = AOUT_VAR_STEREO;
- text.psz_string = _("Stereo");
- var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
- val.i_int = AOUT_VAR_MONO;
- text.psz_string = _("Mono");
- var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
- if ( i_nb_channels == 2 )
- {
- val.i_int = AOUT_VAR_STEREO;
- }
- else
- {
- val.i_int = AOUT_VAR_MONO;
- }
- var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
- var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
- }
-
- var_TriggerCallback( p_aout, "intf-change" );
-
- p_aout->format.i_rate = obtained.freq;
- p_aout->i_nb_samples = obtained.samples;
- p_aout->pf_play = Play;
- p_aout->pf_pause = NULL;
- p_aout->pf_flush = NULL;
-
- return VLC_SUCCESS;
-}
-
-/*****************************************************************************
- * Play: play a sound samples buffer
- *****************************************************************************/
-static void Play( audio_output_t * p_aout, block_t *block )
-{
- aout_FifoPush( &p_aout->fifo, block );
-}
-
-/*****************************************************************************
- * Close: close the audio device
- *****************************************************************************/
-static void Close ( vlc_object_t *p_this )
-{
- VLC_UNUSED(p_this);
- SDL_PauseAudio( 1 );
- SDL_CloseAudio();
- SDL_QuitSubSystem( SDL_INIT_AUDIO );
-}
-
-/*****************************************************************************
- * SDLCallback: what to do once SDL has played sound samples
- *****************************************************************************/
-static void SDLCallback( void * _p_aout, uint8_t * p_stream, int i_len )
-{
- audio_output_t * p_aout = (audio_output_t *)_p_aout;
- aout_buffer_t * p_buffer;
-
- /* SDL is unable to call us at regular times, or tell us its current
- * hardware latency, or the buffer state. So we just pop data and throw
- * it at SDL's face. Nah. */
-
- vlc_mutex_lock( &p_aout->lock );
- p_buffer = aout_FifoPop( &p_aout->fifo );
- vlc_mutex_unlock( &p_aout->lock );
-
- if ( p_buffer != NULL )
- {
- vlc_memcpy( p_stream, p_buffer->p_buffer, i_len );
- aout_BufferFree( p_buffer );
- }
- else
- {
- vlc_memset( p_stream, 0, i_len );
- }
-}
-
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