audio.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:17k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * libvlc_audio.c: New libvlc audio control API
- *****************************************************************************
- * Copyright (C) 2006 the VideoLAN team
- * $Id: 4a590726e072c6cf85deaa76a69f0ec73cab8eaa $
- *
- * Authors: Filippo Carone <filippo@carone.org>
- * Jean-Paul Saman <jpsaman _at_ m2x _dot_ nl>
- *
- * 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.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <vlc/libvlc.h>
- #include <vlc/libvlc_media.h>
- #include <vlc/libvlc_media_player.h>
- #include <vlc_common.h>
- #include <vlc_input.h>
- #include <vlc_aout.h>
- #include "libvlc_internal.h"
- #include "media_player_internal.h"
- /*
- * Remember to release the returned aout_instance_t since it is locked at
- * the end of this function.
- */
- static aout_instance_t *GetAOut( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_exception )
- {
- if( !p_instance )
- return NULL;
- aout_instance_t * p_aout = NULL;
- p_aout = vlc_object_find( p_instance->p_libvlc_int, VLC_OBJECT_AOUT, FIND_CHILD );
- if( !p_aout )
- {
- libvlc_exception_raise( p_exception, "No active audio output" );
- return NULL;
- }
- return p_aout;
- }
- /*****************************************
- * Get the list of available audio outputs
- *****************************************/
- VLC_PUBLIC_API libvlc_audio_output_t *
- libvlc_audio_output_list_get( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- VLC_UNUSED( p_instance );
- libvlc_audio_output_t *p_list = NULL,
- *p_actual = NULL,
- *p_previous = NULL;
- module_t **module_list = module_list_get( NULL );
- for (size_t i = 0; module_list[i]; i++)
- {
- module_t *p_module = module_list[i];
- if( module_provides( p_module, "audio output" ) )
- {
- if( p_actual == NULL)
- {
- p_actual = ( libvlc_audio_output_t * )
- malloc( sizeof( libvlc_audio_output_t ) );
- if( p_actual == NULL )
- {
- libvlc_exception_raise( p_e, "Not enough memory" );
- libvlc_audio_output_list_release( p_list );
- module_list_free( module_list );
- return NULL;
- }
- if( p_list == NULL )
- {
- p_list = p_actual;
- p_previous = p_actual;
- }
- }
- p_actual->psz_name = strdup( module_get_object( p_module ) );
- p_actual->psz_description = strdup( module_get_name( p_module, true ) );
- p_actual->p_next = NULL;
- if( p_previous != p_actual ) /* not first item */
- p_previous->p_next = p_actual;
- p_previous = p_actual;
- p_actual = p_actual->p_next;
- }
- }
- module_list_free( module_list );
- return p_list;
- }
- /********************************************
- * Free the list of available audio outputs
- ***********************************************/
- VLC_PUBLIC_API void libvlc_audio_output_list_release( libvlc_audio_output_t *p_list )
- {
- libvlc_audio_output_t *p_actual, *p_before;
- p_actual = p_list;
- while ( p_actual )
- {
- free( p_actual->psz_name );
- free( p_actual->psz_description );
- p_before = p_actual;
- p_actual = p_before->p_next;
- free( p_before );
- }
- }
- /***********************
- * Set the audio output.
- ***********************/
- VLC_PUBLIC_API int libvlc_audio_output_set( libvlc_instance_t *p_instance,
- const char *psz_name )
- {
- if( module_exists( psz_name ) )
- {
- config_PutPsz( p_instance->p_libvlc_int, "aout", psz_name );
- return true;
- }
- else
- return false;
- }
- /****************************
- * Get count of devices.
- *****************************/
- int libvlc_audio_output_device_count( libvlc_instance_t *p_instance,
- const char *psz_audio_output )
- {
- char *psz_config_name = NULL;
- if( !psz_audio_output )
- return 0;
- if( asprintf( &psz_config_name, "%s-audio-device", psz_audio_output ) == -1 )
- return 0;
- module_config_t *p_module_config = config_FindConfig(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name );
- if( p_module_config && p_module_config->pf_update_list )
- {
- vlc_value_t val;
- val.psz_string = strdup( p_module_config->value.psz );
- p_module_config->pf_update_list(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name, val, val, NULL );
- free( val.psz_string );
- free( psz_config_name );
- return p_module_config->i_list;
- }
- else
- free( psz_config_name );
- return 0;
- }
- /********************************
- * Get long name of device
- *********************************/
- char * libvlc_audio_output_device_longname( libvlc_instance_t *p_instance,
- const char *psz_audio_output,
- int i_device )
- {
- char *psz_config_name = NULL;
- if( !psz_audio_output )
- return NULL;
- if( asprintf( &psz_config_name, "%s-audio-device", psz_audio_output ) == -1 )
- return NULL;
- module_config_t *p_module_config = config_FindConfig(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name );
- if( p_module_config )
- {
- // refresh if there arent devices
- if( p_module_config->i_list < 2 && p_module_config->pf_update_list )
- {
- vlc_value_t val;
- val.psz_string = strdup( p_module_config->value.psz );
- p_module_config->pf_update_list(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name, val, val, NULL );
- free( val.psz_string );
- }
- free( psz_config_name );
- if( i_device >= 0 && i_device < p_module_config->i_list )
- {
- if( p_module_config->ppsz_list_text[i_device] )
- return strdup( p_module_config->ppsz_list_text[i_device] );
- else
- return strdup( p_module_config->ppsz_list[i_device] );
- }
- }
- else
- free( psz_config_name );
- return NULL;
- }
- /********************************
- * Get id name of device
- *********************************/
- char * libvlc_audio_output_device_id( libvlc_instance_t *p_instance,
- const char *psz_audio_output,
- int i_device )
- {
- char *psz_config_name = NULL;
- if( !psz_audio_output )
- return NULL;
- if( asprintf( &psz_config_name, "%s-audio-device", psz_audio_output ) == -1)
- return NULL;
- module_config_t *p_module_config = config_FindConfig(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name );
- if( p_module_config )
- {
- // refresh if there arent devices
- if( p_module_config->i_list < 2 && p_module_config->pf_update_list )
- {
- vlc_value_t val;
- val.psz_string = strdup( p_module_config->value.psz );
- p_module_config->pf_update_list(
- VLC_OBJECT( p_instance->p_libvlc_int ), psz_config_name, val, val, NULL );
- free( val.psz_string );
- }
- free( psz_config_name );
- if( i_device >= 0 && i_device < p_module_config->i_list )
- return strdup( p_module_config->ppsz_list[i_device] );
- }
- else
- free( psz_config_name );
- return NULL;
- }
- /*****************************
- * Set device for using
- *****************************/
- VLC_PUBLIC_API void libvlc_audio_output_device_set( libvlc_instance_t *p_instance,
- const char *psz_audio_output,
- const char *psz_device_id )
- {
- char *psz_config_name = NULL;
- if( !psz_audio_output || !psz_device_id )
- return;
- if( asprintf( &psz_config_name, "%s-audio-device", psz_audio_output ) == -1 )
- return;
- config_PutPsz( p_instance->p_libvlc_int, psz_config_name, psz_device_id );
- free( psz_config_name );
- }
- /*****************************************************************************
- * libvlc_audio_output_get_device_type : Get the current audio device type
- *****************************************************************************/
- int libvlc_audio_output_get_device_type( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- aout_instance_t *p_aout = GetAOut( p_instance, p_e );
- if( p_aout )
- {
- vlc_value_t val;
- var_Get( p_aout, "audio-device", &val );
- vlc_object_release( p_aout );
- return val.i_int;
- }
- libvlc_exception_raise( p_e, "Unable to get audio output" );
- return libvlc_AudioOutputDevice_Error;
- }
- /*****************************************************************************
- * libvlc_audio_output_set_device_type : Set the audio device type
- *****************************************************************************/
- void libvlc_audio_output_set_device_type( libvlc_instance_t *p_instance,
- int device_type,
- libvlc_exception_t *p_e )
- {
- aout_instance_t *p_aout = GetAOut( p_instance, p_e );
- if( p_aout )
- {
- vlc_value_t val;
- int i_ret = -1;
- val.i_int = (int) device_type;
- i_ret = var_Set( p_aout, "audio-device", val );
- if( i_ret < 0 )
- {
- libvlc_exception_raise( p_e, "Failed setting audio device" );
- vlc_object_release( p_aout );
- return;
- }
- vlc_object_release( p_aout );
- }
- }
- /*****************************************************************************
- * libvlc_audio_get_mute : Get the volume state, true if muted
- *****************************************************************************/
- void libvlc_audio_toggle_mute( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- VLC_UNUSED(p_e);
- aout_VolumeMute( p_instance->p_libvlc_int, NULL );
- }
- int libvlc_audio_get_mute( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- /*
- * If the volume level is 0, then the channel is muted
- */
- audio_volume_t i_volume;
- i_volume = libvlc_audio_get_volume(p_instance, p_e);
- if ( i_volume == 0 )
- return true;
- return false;
- }
- void libvlc_audio_set_mute( libvlc_instance_t *p_instance, int mute,
- libvlc_exception_t *p_e )
- {
- if ( mute ^ libvlc_audio_get_mute( p_instance, p_e ) )
- {
- aout_VolumeMute( p_instance->p_libvlc_int, NULL );
- }
- }
- /*****************************************************************************
- * libvlc_audio_get_volume : Get the current volume (range 0-200 %)
- *****************************************************************************/
- int libvlc_audio_get_volume( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- VLC_UNUSED(p_e);
- audio_volume_t i_volume;
- aout_VolumeGet( p_instance->p_libvlc_int, &i_volume );
- return (i_volume*200+AOUT_VOLUME_MAX/2)/AOUT_VOLUME_MAX;
- }
- /*****************************************************************************
- * libvlc_audio_set_volume : Set the current volume
- *****************************************************************************/
- void libvlc_audio_set_volume( libvlc_instance_t *p_instance, int i_volume,
- libvlc_exception_t *p_e )
- {
- if( i_volume >= 0 && i_volume <= 200 )
- {
- i_volume = (i_volume * AOUT_VOLUME_MAX + 100) / 200;
- aout_VolumeSet( p_instance->p_libvlc_int, i_volume );
- }
- else
- {
- libvlc_exception_raise( p_e, "Volume out of range" );
- }
- }
- /*****************************************************************************
- * libvlc_audio_get_track_count : Get the number of available audio tracks
- *****************************************************************************/
- int libvlc_audio_get_track_count( libvlc_media_player_t *p_mi,
- libvlc_exception_t *p_e )
- {
- input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
- vlc_value_t val_list;
- int i_track_count;
- if( !p_input_thread )
- return -1;
- var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
- i_track_count = val_list.p_list->i_count;
- var_Change( p_input_thread, "audio-es", VLC_VAR_FREELIST, &val_list, NULL );
- vlc_object_release( p_input_thread );
- return i_track_count;
- }
- /*****************************************************************************
- * libvlc_audio_get_track_description : Get the description of available audio tracks
- *****************************************************************************/
- libvlc_track_description_t *
- libvlc_audio_get_track_description( libvlc_media_player_t *p_mi,
- libvlc_exception_t *p_e )
- {
- return libvlc_get_track_description( p_mi, "audio-es", p_e);
- }
- /*****************************************************************************
- * libvlc_audio_get_track : Get the current audio track
- *****************************************************************************/
- int libvlc_audio_get_track( libvlc_media_player_t *p_mi,
- libvlc_exception_t *p_e )
- {
- input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
- vlc_value_t val_list;
- vlc_value_t val;
- int i_track = -1;
- int i_ret = -1;
- int i;
- if( !p_input_thread )
- return -1;
- i_ret = var_Get( p_input_thread, "audio-es", &val );
- if( i_ret < 0 )
- {
- libvlc_exception_raise( p_e, "Getting Audio track information failed" );
- vlc_object_release( p_input_thread );
- return i_ret;
- }
- var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
- for( i = 0; i < val_list.p_list->i_count; i++ )
- {
- if( val_list.p_list->p_values[i].i_int == val.i_int )
- {
- i_track = i;
- break;
- }
- }
- var_Change( p_input_thread, "audio-es", VLC_VAR_FREELIST, &val_list, NULL );
- vlc_object_release( p_input_thread );
- return i_track;
- }
- /*****************************************************************************
- * libvlc_audio_set_track : Set the current audio track
- *****************************************************************************/
- void libvlc_audio_set_track( libvlc_media_player_t *p_mi, int i_track,
- libvlc_exception_t *p_e )
- {
- input_thread_t *p_input_thread = libvlc_get_input_thread( p_mi, p_e );
- vlc_value_t val_list;
- vlc_value_t newval;
- int i_ret = -1;
- if( !p_input_thread )
- return;
- var_Change( p_input_thread, "audio-es", VLC_VAR_GETCHOICES, &val_list, NULL );
- if( (i_track < 0) || (i_track > val_list.p_list->i_count) )
- {
- libvlc_exception_raise( p_e, "Audio track out of range" );
- goto end;
- }
- newval = val_list.p_list->p_values[i_track];
- i_ret = var_Set( p_input_thread, "audio-es", newval );
- if( i_ret < 0 )
- libvlc_exception_raise( p_e, "Setting audio track failed" );
- end:
- var_Change( p_input_thread, "audio-es", VLC_VAR_FREELIST, &val_list, NULL );
- vlc_object_release( p_input_thread );
- }
- /*****************************************************************************
- * libvlc_audio_get_channel : Get the current audio channel
- *****************************************************************************/
- int libvlc_audio_get_channel( libvlc_instance_t *p_instance,
- libvlc_exception_t *p_e )
- {
- aout_instance_t *p_aout = GetAOut( p_instance, p_e );
- if( p_aout )
- {
- vlc_value_t val;
- var_Get( p_aout, "audio-channels", &val );
- vlc_object_release( p_aout );
- return val.i_int;
- }
- libvlc_exception_raise( p_e, "Unable to get audio output" );
- return libvlc_AudioChannel_Error;
- }
- /*****************************************************************************
- * libvlc_audio_set_channel : Set the current audio channel
- *****************************************************************************/
- void libvlc_audio_set_channel( libvlc_instance_t *p_instance,
- int channel,
- libvlc_exception_t *p_e )
- {
- aout_instance_t *p_aout = GetAOut( p_instance, p_e );
- if( p_aout )
- {
- vlc_value_t val;
- int i_ret = -1;
- val.i_int = channel;
- i_ret = var_Set( p_aout, "audio-channels", val );
- if( i_ret < 0 )
- libvlc_exception_raise( p_e, "Failed setting audio channel" );
- vlc_object_release( p_aout );
- }
- }