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357 lines
11 KiB
357 lines
11 KiB
/*****************************************************************************
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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 VLC authors and VideoLAN
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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 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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/*****************************************************************************
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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 <stdio.h>
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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_fs.h>
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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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typedef struct
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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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} aout_sys_t;
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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 Play ( audio_output_t *, block_t *, vlc_tick_t );
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static void Pause ( audio_output_t *, bool, vlc_tick_t );
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static void Flush ( audio_output_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 CHANNELS_TEXT N_("Number of output channels")
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#define CHANNELS_LONGTEXT N_("By default (0), 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[] = {
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"u8", "s16",
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#ifndef WORDS_BIGENDIAN
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"float32",
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#endif
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"spdif",
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};
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static const int format_int[] = {
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VLC_CODEC_U8, VLC_CODEC_S16N,
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#ifndef WORDS_BIGENDIAN
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VLC_CODEC_FL32,
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#endif
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VLC_CODEC_SPDIFL,
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};
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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_subcategory( SUBCAT_AUDIO_AOUT )
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add_savefile("audiofile-file", "audiofile.wav", FILE_TEXT, FILE_LONGTEXT)
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add_string( "audiofile-format", "s16",
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FORMAT_TEXT, NULL )
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change_string_list( format_list, format_list )
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add_integer( "audiofile-channels", 0,
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CHANNELS_TEXT, CHANNELS_LONGTEXT )
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change_integer_range( 0, 6 )
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add_bool( "audiofile-wav", true, WAV_TEXT, WAV_LONGTEXT )
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set_capability( "audio output", 0 )
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add_shortcut( "file", "audiofile" )
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set_callback( Open )
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vlc_module_end ()
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static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict fmt )
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{
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char * psz_name, * psz_format;
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int i_channels;
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if( aout_FormatNbChannels( fmt ) == 0 )
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return VLC_EGENERIC;
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psz_name = var_InheritString( p_aout, "audiofile-file" );
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if( !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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aout_sys_t *p_sys = malloc( sizeof( aout_sys_t ) );
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if( p_sys == NULL )
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return VLC_ENOMEM;
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p_aout->sys = p_sys;
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if( !strcmp( psz_name, "-" ) )
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p_sys->p_file = stdout;
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else
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p_sys->p_file = vlc_fopen( psz_name, "wb" );
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free( psz_name );
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if ( p_sys->p_file == NULL )
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{
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_aout->time_get = NULL;
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p_aout->play = Play;
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p_aout->pause = Pause;
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p_aout->flush = Flush;
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/* Audio format */
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psz_format = var_InheritString( p_aout, "audiofile-format" );
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if ( !psz_format ) /* FIXME */
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{
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if( p_sys->p_file != stdout )
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fclose( p_sys->p_file );
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free( p_sys );
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return VLC_EGENERIC;
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}
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fmt->i_format = 0;
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for (size_t i = 0; i < ARRAY_SIZE(format_list); i++)
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{
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if ( !strcmp( format_list[i], psz_format ) )
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{
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fmt->i_format = format_int[i];
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break;
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}
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}
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if (fmt->i_format == 0)
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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_sys->p_file != stdout )
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fclose( p_sys->p_file );
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free( 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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if ( AOUT_FMT_SPDIF( fmt ) )
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{
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fmt->i_bytes_per_frame = AOUT_SPDIF_SIZE;
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fmt->i_frame_length = A52_FRAME_NB;
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}
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/* Channels number */
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i_channels = var_InheritInteger( p_aout, "audiofile-channels" );
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if( i_channels > 0 && i_channels <= CHANNELS_MAX )
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{
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fmt->i_physical_channels = pi_channels_maps[i_channels];
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}
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fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
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/* WAV header */
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p_sys->b_add_wav_header = var_InheritBool( p_aout, "audiofile-wav" );
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if( p_sys->b_add_wav_header )
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{
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/* Write wave header */
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WAVEHEADER *wh = &p_sys->waveh;
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memset( wh, 0, sizeof(*wh) );
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switch( fmt->i_format )
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{
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#ifndef WORDS_BIGENDIAN
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case VLC_CODEC_FL32:
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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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#endif
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case VLC_CODEC_U8:
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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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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( fmt );
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wh->SampleFreq = fmt->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_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error: %s", vlc_strerror_c(errno) );
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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 Stop( audio_output_t *p_aout )
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{
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msg_Dbg( p_aout, "closing audio file" );
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aout_sys_t *p_sys = p_aout->sys;
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if( p_sys->b_add_wav_header )
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{
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/* Update Wave Header */
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p_sys->waveh.Length =
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p_sys->waveh.DataLength + sizeof(WAVEHEADER) - 4;
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/* Write Wave Header */
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if( fseek( p_sys->p_file, 0, SEEK_SET ) )
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{
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msg_Err( p_aout, "seek error: %s", vlc_strerror_c(errno) );
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}
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/* Header -> little endian format */
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SetDWLE( &p_sys->waveh.Length,
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p_sys->waveh.Length );
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SetDWLE( &p_sys->waveh.DataLength,
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p_sys->waveh.DataLength );
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if( fwrite( &p_sys->waveh, sizeof(WAVEHEADER), 1,
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p_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error: %s", vlc_strerror_c(errno) );
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}
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}
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if( p_sys->p_file != stdout )
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fclose( p_sys->p_file );
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free( 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( audio_output_t * p_aout, block_t *p_buffer, vlc_tick_t date )
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{
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aout_sys_t *p_sys = p_aout->sys;
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if( fwrite( p_buffer->p_buffer, p_buffer->i_buffer, 1,
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p_sys->p_file ) != 1 )
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{
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msg_Err( p_aout, "write error: %s", vlc_strerror_c(errno) );
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}
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if( p_sys->b_add_wav_header )
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{
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/* Update Wave Header */
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p_sys->waveh.DataLength += p_buffer->i_buffer;
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}
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block_Release( p_buffer );
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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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aout_sys_t *p_sys = aout->sys;
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if( fflush( p_sys->p_file ) )
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msg_Err( aout, "flush error: %s", vlc_strerror_c(errno) );
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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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aout->start = Start;
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aout->stop = Stop;
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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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