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263 lines
8.8 KiB
263 lines
8.8 KiB
/*****************************************************************************
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* rawaud.c : raw audio input module for vlc
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*****************************************************************************
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* Copyright (C) 2009 VLC authors and VideoLAN
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* $Id$
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*
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* Authors: Jarmo Torvinen <jarmo.torvinen@jutel.fi>
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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 <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_demux.h>
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/*****************************************************************************
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* Module descriptor
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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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#define SAMPLERATE_TEXT N_("Audio samplerate (Hz)")
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#define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.")
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#define CHANNELS_TEXT N_("Audio channels")
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#define CHANNELS_LONGTEXT N_("Audio channels in input stream. Numeric value >0. Default is 2.")
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#define FOURCC_TEXT N_("FOURCC code of raw input format")
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#define FOURCC_LONGTEXT N_( \
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"FOURCC code of the raw input format. This is a four character string." )
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#define LANG_TEXT N_("Forces the audio language")
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#define LANG_LONGTEXT N_("Forces the audio language for the output mux. Three letter ISO639 code. Default is 'eng'. ")
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#ifdef WORDS_BIGENDIAN
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# define FOURCC_DEFAULT "s16b"
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#else
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# define FOURCC_DEFAULT "s16l"
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#endif
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vlc_module_begin();
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set_shortname( "Raw Audio" );
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set_description( N_("Raw audio demuxer") );
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set_capability( "demux", 0 );
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_DEMUX );
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set_callbacks( Open, Close );
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add_shortcut( "rawaud" );
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add_integer( "rawaud-channels", 2, CHANNELS_TEXT, CHANNELS_LONGTEXT, false );
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add_integer( "rawaud-samplerate", 48000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false );
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add_string( "rawaud-fourcc", FOURCC_DEFAULT,
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FOURCC_TEXT, FOURCC_LONGTEXT, false );
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add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT, false);
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vlc_module_end();
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/*****************************************************************************
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* Definitions of structures used by this plugin
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*****************************************************************************/
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struct demux_sys_t
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{
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es_out_id_t *p_es;
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es_format_t fmt;
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unsigned int i_frame_size;
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unsigned int i_frame_samples;
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unsigned int i_seek_step;
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date_t pts;
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};
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Demux( demux_t * );
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static int Control( demux_t *, int i_query, va_list args );
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/*****************************************************************************
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* Open: initializes raw audio demuxer
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*****************************************************************************/
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static int Open( vlc_object_t * p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys;
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p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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if( !p_sys )
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return VLC_ENOMEM;
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es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
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char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" );
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p_sys->fmt.i_codec = vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc );
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free( psz_fourcc );
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if( !p_sys->fmt.i_codec )
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{
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msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
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es_format_Clean( &p_sys->fmt );
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free( p_sys );
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return VLC_EGENERIC;
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}
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// get the bits per sample ratio based on codec
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switch( p_sys->fmt.i_codec )
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{
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case VLC_CODEC_FL64:
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p_sys->fmt.audio.i_bitspersample = 64;
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break;
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case VLC_CODEC_FL32:
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case VLC_CODEC_S32L:
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case VLC_CODEC_S32B:
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p_sys->fmt.audio.i_bitspersample = 32;
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break;
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case VLC_CODEC_S24L:
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case VLC_CODEC_S24B:
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p_sys->fmt.audio.i_bitspersample = 24;
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break;
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case VLC_CODEC_S16L:
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case VLC_CODEC_S16B:
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p_sys->fmt.audio.i_bitspersample = 16;
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break;
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case VLC_CODEC_S8:
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case VLC_CODEC_U8:
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p_sys->fmt.audio.i_bitspersample = 8;
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break;
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default:
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msg_Err( p_demux, "unknown fourcc format %4.4s",
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(char *)&p_sys->fmt.i_codec);
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es_format_Clean( &p_sys->fmt );
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );
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p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );
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p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );
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if( p_sys->fmt.audio.i_rate <= 0 )
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{
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msg_Err( p_demux, "invalid sample rate");
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es_format_Clean( &p_sys->fmt );
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free( p_sys );
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return VLC_EGENERIC;
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}
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if( p_sys->fmt.audio.i_channels <= 0 )
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{
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msg_Err( p_demux, "invalid number of channels");
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es_format_Clean( &p_sys->fmt );
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free( p_sys );
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return VLC_EGENERIC;
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}
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p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
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p_sys->fmt.audio.i_channels *
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p_sys->fmt.audio.i_bitspersample;
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msg_Dbg( p_demux,
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"format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",
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p_sys->fmt.audio.i_channels,
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p_sys->fmt.audio.i_rate,
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(char*)&p_sys->fmt.i_codec,
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p_sys->fmt.audio.i_bitspersample,
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p_sys->fmt.i_bitrate);
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/* add the es */
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p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
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msg_Dbg( p_demux, "elementary stream added");
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/* initialize timing */
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date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
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date_Set( &p_sys->pts, 0 );
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/* calculate 50ms frame size/time */
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p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
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p_sys->i_seek_step = p_sys->fmt.audio.i_channels *
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( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
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p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step;
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msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size);
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close: frees unused data
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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demux_t *p_demux = (demux_t*)p_this;
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demux_sys_t *p_sys = p_demux->p_sys;
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es_format_Clean( &p_sys->fmt );
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free( p_sys );
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}
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/*****************************************************************************
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* Demux: reads and demuxes data packets
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
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*****************************************************************************/
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static int Demux( demux_t *p_demux )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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block_t *p_block;
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if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
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{
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/* EOF */
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return 0;
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}
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p_block->i_dts =
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p_block->i_pts = VLC_TS_0 + date_Get( &p_sys->pts );
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es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
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es_out_Send( p_demux->out, p_sys->p_es, p_block );
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date_Increment( &p_sys->pts, p_sys->i_frame_samples );
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return 1;
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}
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/*****************************************************************************
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* Control:
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*****************************************************************************/
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static int Control( demux_t *p_demux, int i_query, va_list args )
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{
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demux_sys_t *p_sys = p_demux->p_sys;
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return demux_vaControlHelper( p_demux->s, 0, -1,
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p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );
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}
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