mirror of
https://code.videolan.org/videolan/vlc
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349 lines
12 KiB
C
349 lines
12 KiB
C
/*****************************************************************************
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* file.c : audio output which writes the samples to a file
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*****************************************************************************
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* Copyright (C) 2002 the VideoLAN team
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* $Id$
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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* Gildas Bazin <gbazin@netcourrier.com>
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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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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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 <errno.h>
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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_codecs.h> /* WAVEHEADER */
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#include <vlc_charset.h>
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#define FRAME_SIZE 2048
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#define A52_FRAME_NB 1536
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/*****************************************************************************
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* aout_sys_t: audio output method descriptor
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*****************************************************************************
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* This structure is part of the audio output thread descriptor.
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* It describes the direct sound specific properties of an audio device.
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*****************************************************************************/
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struct aout_sys_t
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{
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FILE * p_file;
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bool b_add_wav_header;
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WAVEHEADER waveh; /* Wave header of the output file */
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};
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#define CHANNELS_MAX 6
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static const int pi_channels_maps[CHANNELS_MAX+1] =
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{
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0,
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AOUT_CHAN_CENTER,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
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| AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
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AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
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| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
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};
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/*****************************************************************************
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* Local prototypes.
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close ( vlc_object_t * );
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static void Play ( aout_instance_t * );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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#define FORMAT_TEXT N_("Output format")
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#define FORMAT_LONGTEXT N_("One of \"u8\", \"s8\", \"u16\", \"s16\", " \
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"\"u16_le\", \"s16_le\", \"u16_be\", \"s16_be\", \"fixed32\", " \
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"\"float32\" or \"spdif\"")
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#define CHANNELS_TEXT N_("Number of output channels")
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#define CHANNELS_LONGTEXT N_("By default, all the channels of the incoming " \
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"will be saved but you can restrict the number of channels here.")
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#define WAV_TEXT N_("Add WAVE header")
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#define WAV_LONGTEXT N_("Instead of writing a raw file, you can add a WAV " \
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"header to the file.")
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static const char *const format_list[] = { "u8", "s8", "u16", "s16", "u16_le",
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"s16_le", "u16_be", "s16_be", "fixed32",
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"float32", "spdif" };
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static const int format_int[] = { VLC_FOURCC('u','8',' ',' '),
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VLC_FOURCC('s','8',' ',' '),
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AOUT_FMT_U16_NE, AOUT_FMT_S16_NE,
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VLC_FOURCC('u','1','6','l'),
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VLC_FOURCC('s','1','6','l'),
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VLC_FOURCC('u','1','6','b'),
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VLC_FOURCC('s','1','6','b'),
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VLC_FOURCC('f','i','3','2'),
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VLC_FOURCC('f','l','3','2'),
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VLC_FOURCC('s','p','i','f') };
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#define FILE_TEXT N_("Output file")
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#define FILE_LONGTEXT N_("File to which the audio samples will be written to. (\"-\" for stdout")
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vlc_module_begin ()
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set_description( N_("File audio output") )
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set_shortname( N_("File") )
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set_category( CAT_AUDIO )
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set_subcategory( SUBCAT_AUDIO_AOUT )
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add_string( "audiofile-format", "s16", NULL,
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FORMAT_TEXT, FORMAT_LONGTEXT, true );
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change_string_list( format_list, 0, 0 );
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add_integer( "audiofile-channels", 0, NULL,
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CHANNELS_TEXT, CHANNELS_LONGTEXT, true );
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add_file( "audiofile-file", "audiofile.wav", NULL, FILE_TEXT,
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FILE_LONGTEXT, false );
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add_bool( "audiofile-wav", 1, NULL, WAV_TEXT, WAV_LONGTEXT, true )
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set_capability( "audio output", 0 )
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add_shortcut( "file" )
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add_shortcut( "audiofile" )
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set_callbacks( Open, Close )
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vlc_module_end ()
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/*****************************************************************************
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* Open: open a dummy audio device
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*****************************************************************************/
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static int Open( 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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char * psz_name, * psz_format;
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const char * const * ppsz_compare = format_list;
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vlc_value_t val;
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int i_channels, i = 0;
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var_Create( p_this, "audiofile-file", VLC_VAR_STRING|VLC_VAR_DOINHERIT );
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var_Get( p_this, "audiofile-file", &val );
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psz_name = val.psz_string;
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if( !psz_name || !*psz_name )
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{
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msg_Err( p_aout, "you need to specify an output file name" );
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free( psz_name );
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return VLC_EGENERIC;
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}
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/* Allocate structure */
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p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
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if( p_aout->output.p_sys == NULL )
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return VLC_ENOMEM;
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if( !strcmp( psz_name, "-" ) )
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p_aout->output.p_sys->p_file = stdout;
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else
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p_aout->output.p_sys->p_file = utf8_fopen( psz_name, "wb" );
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free( psz_name );
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if ( p_aout->output.p_sys->p_file == NULL )
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{
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free( p_aout->output.p_sys );
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return VLC_EGENERIC;
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}
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p_aout->output.pf_play = Play;
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/* Audio format */
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var_Create( p_this, "audiofile-format", VLC_VAR_STRING|VLC_VAR_DOINHERIT );
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var_Get( p_this, "audiofile-format", &val );
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psz_format = val.psz_string;
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while ( *ppsz_compare != NULL )
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{
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if ( !strncmp( *ppsz_compare, psz_format, strlen(*ppsz_compare) ) )
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{
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break;
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}
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ppsz_compare++; i++;
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}
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if ( *ppsz_compare == NULL )
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{
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msg_Err( p_aout, "cannot understand the format string (%s)",
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psz_format );
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if( p_aout->output.p_sys->p_file != stdout )
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fclose( p_aout->output.p_sys->p_file );
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free( p_aout->output.p_sys );
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free( psz_format );
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return VLC_EGENERIC;
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}
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free( psz_format );
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p_aout->output.output.i_format = format_int[i];
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if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
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{
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p_aout->output.i_nb_samples = A52_FRAME_NB;
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p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
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p_aout->output.output.i_frame_length = A52_FRAME_NB;
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aout_VolumeNoneInit( p_aout );
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}
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else
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{
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p_aout->output.i_nb_samples = FRAME_SIZE;
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aout_VolumeSoftInit( p_aout );
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}
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/* Channels number */
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var_Create( p_this, "audiofile-channels",
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VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
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var_Get( p_this, "audiofile-channels", &val );
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i_channels = val.i_int;
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if( i_channels > 0 && i_channels <= CHANNELS_MAX )
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{
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p_aout->output.output.i_physical_channels =
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pi_channels_maps[i_channels];
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}
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/* WAV header */
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var_Create( p_this, "audiofile-wav", VLC_VAR_BOOL|VLC_VAR_DOINHERIT );
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var_Get( p_this, "audiofile-wav", &val );
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p_aout->output.p_sys->b_add_wav_header = val.b_bool;
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if( p_aout->output.p_sys->b_add_wav_header )
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{
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/* Write wave header */
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WAVEHEADER *wh = &p_aout->output.p_sys->waveh;
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memset( wh, 0, sizeof(wh) );
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switch( p_aout->output.output.i_format )
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{
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case VLC_FOURCC('f','l','3','2'):
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wh->Format = WAVE_FORMAT_IEEE_FLOAT;
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wh->BitsPerSample = sizeof(float) * 8;
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break;
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case VLC_FOURCC('u','8',' ',' '):
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wh->Format = WAVE_FORMAT_PCM;
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wh->BitsPerSample = 8;
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break;
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case VLC_FOURCC('s','1','6','l'):
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default:
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wh->Format = WAVE_FORMAT_PCM;
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wh->BitsPerSample = 16;
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break;
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}
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wh->MainChunkID = VLC_FOURCC('R', 'I', 'F', 'F');
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wh->Length = 0; /* temp, to be filled in as we go */
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wh->ChunkTypeID = VLC_FOURCC('W', 'A', 'V', 'E');
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wh->SubChunkID = VLC_FOURCC('f', 'm', 't', ' ');
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wh->SubChunkLength = 16;
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wh->Modus = aout_FormatNbChannels( &p_aout->output.output );
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wh->SampleFreq = p_aout->output.output.i_rate;
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wh->BytesPerSample = wh->Modus * ( wh->BitsPerSample / 8 );
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wh->BytesPerSec = wh->BytesPerSample * wh->SampleFreq;
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wh->DataChunkID = VLC_FOURCC('d', 'a', 't', 'a');
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wh->DataLength = 0; /* temp, to be filled in as we go */
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/* Header -> little endian format */
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SetWLE( &wh->Format, wh->Format );
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SetWLE( &wh->BitsPerSample, wh->BitsPerSample );
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SetDWLE( &wh->SubChunkLength, wh->SubChunkLength );
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SetWLE( &wh->Modus, wh->Modus );
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SetDWLE( &wh->SampleFreq, wh->SampleFreq );
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SetWLE( &wh->BytesPerSample, wh->BytesPerSample );
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SetDWLE( &wh->BytesPerSec, wh->BytesPerSec );
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if( fwrite( wh, sizeof(WAVEHEADER), 1,
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p_aout->output.p_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error (%m)" );
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}
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}
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return 0;
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}
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/*****************************************************************************
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* Close: close our file
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*****************************************************************************/
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static void Close( 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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msg_Dbg( p_aout, "closing audio file" );
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if( p_aout->output.p_sys->b_add_wav_header )
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{
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/* Update Wave Header */
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p_aout->output.p_sys->waveh.Length =
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p_aout->output.p_sys->waveh.DataLength + sizeof(WAVEHEADER) - 4;
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/* Write Wave Header */
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if( fseek( p_aout->output.p_sys->p_file, 0, SEEK_SET ) )
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{
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msg_Err( p_aout, "seek error (%m)" );
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}
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/* Header -> little endian format */
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SetDWLE( &p_aout->output.p_sys->waveh.Length,
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p_aout->output.p_sys->waveh.Length );
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SetDWLE( &p_aout->output.p_sys->waveh.DataLength,
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p_aout->output.p_sys->waveh.DataLength );
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if( fwrite( &p_aout->output.p_sys->waveh, sizeof(WAVEHEADER), 1,
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p_aout->output.p_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error (%m)" );
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}
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}
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if( p_aout->output.p_sys->p_file != stdout )
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fclose( p_aout->output.p_sys->p_file );
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free( p_aout->output.p_sys );
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}
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/*****************************************************************************
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* Play: pretend to play a sound
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*****************************************************************************/
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static void Play( aout_instance_t * p_aout )
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{
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aout_buffer_t * p_buffer;
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p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
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if( fwrite( p_buffer->p_buffer, p_buffer->i_nb_bytes, 1,
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p_aout->output.p_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error (%m)" );
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}
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if( p_aout->output.p_sys->b_add_wav_header )
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{
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/* Update Wave Header */
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p_aout->output.p_sys->waveh.DataLength += p_buffer->i_nb_bytes;
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}
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aout_BufferFree( p_buffer );
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}
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