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|
/*****************************************************************************
* au.c : au file input module for vlc
*****************************************************************************
* Copyright (C) 2001-2007 VLC authors and VideoLAN
* $Id: b9267eae2f7abda56180f146651f4434459fb99d $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_demux.h>
/* TODO:
* - all adpcm things (I _NEED_ samples)
* - ...
*/
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin ()
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_description( N_("AU demuxer") )
set_capability( "demux", 10 )
set_callbacks( Open, Close )
add_shortcut( "au" )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
enum AuType_e
{
AU_UNKNOWN = 0,
AU_MULAW_8 = 1, /* 8-bit ISDN u-law */
AU_LINEAR_8 = 2, /* 8-bit linear PCM */
AU_LINEAR_16 = 3, /* 16-bit linear PCM */
AU_LINEAR_24 = 4, /* 24-bit linear PCM */
AU_LINEAR_32 = 5, /* 32-bit linear PCM */
AU_FLOAT = 6, /* 32-bit IEEE floating point */
AU_DOUBLE = 7, /* 64-bit IEEE floating point */
AU_ADPCM_G721 = 23, /* 4-bit CCITT g.721 ADPCM */
AU_ADPCM_G722 = 24, /* CCITT g.722 ADPCM */
AU_ADPCM_G723_3 = 25, /* CCITT g.723 3-bit ADPCM */
AU_ADPCM_G723_5 = 26, /* CCITT g.723 5-bit ADPCM */
AU_ALAW_8 = 27 /* 8-bit ISDN A-law */
};
enum AuCat_e
{
AU_CAT_UNKNOWN = 0,
AU_CAT_PCM = 1,
AU_CAT_ADPCM = 2
};
struct demux_sys_t
{
es_format_t fmt;
es_out_id_t *es;
mtime_t i_time;
int i_frame_size;
mtime_t i_frame_length;
uint32_t i_header_size;
};
static int Demux( demux_t * );
static int Control ( demux_t *, int i_query, va_list args );
/*****************************************************************************
* Open: check file and initializes structures
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys;
uint8_t hdr[20];
const uint8_t *p_peek;
int i_cat;
int i_samples, i_modulo;
if( stream_Peek( p_demux->s , &p_peek, 4 ) < 4 )
return VLC_EGENERIC;
if( memcmp( p_peek, ".snd", 4 ) )
return VLC_EGENERIC;
/* skip signature */
stream_Read( p_demux->s, NULL, 4 ); /* cannot fail */
/* read header */
if( stream_Read( p_demux->s, hdr, 20 ) < 20 )
{
msg_Err( p_demux, "cannot read" );
return VLC_EGENERIC;
}
if( GetDWBE( &hdr[0] ) < 24 )
{
msg_Err( p_demux, "invalid file" );
return VLC_EGENERIC;
}
DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
p_sys->i_time = 0;
p_sys->i_header_size = GetDWBE( &hdr[0] );
/* skip extra header data */
if( p_sys->i_header_size > 24 )
{
stream_Read( p_demux->s, NULL, p_sys->i_header_size - 24 );
}
/* init fmt */
es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
p_sys->fmt.audio.i_rate = GetDWBE( &hdr[12] );
p_sys->fmt.audio.i_channels = GetDWBE( &hdr[16] );
#if 0
p_sys->au.i_header_size = GetDWBE( &p_sys->au.i_header_size );
p_sys->au.i_data_size = GetDWBE( &p_sys->au.i_data_size );
p_sys->au.i_encoding = GetDWBE( &p_sys->au.i_encoding );
p_sys->au.i_sample_rate = GetDWBE( &p_sys->au.i_sample_rate );
p_sys->au.i_channels = GetDWBE( &p_sys->au.i_channels );
#endif
switch( GetDWBE( &hdr[8] ) )
{
case AU_ALAW_8: /* 8-bit ISDN A-law */
p_sys->fmt.i_codec = VLC_CODEC_ALAW;
p_sys->fmt.audio.i_bitspersample = 8;
p_sys->fmt.audio.i_blockalign = 1 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_MULAW_8: /* 8-bit ISDN u-law */
p_sys->fmt.i_codec = VLC_CODEC_MULAW;
p_sys->fmt.audio.i_bitspersample = 8;
p_sys->fmt.audio.i_blockalign = 1 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_LINEAR_8: /* 8-bit linear PCM */
p_sys->fmt.i_codec = VLC_FOURCC( 't','w','o','s' );
p_sys->fmt.audio.i_bitspersample = 8;
p_sys->fmt.audio.i_blockalign = 1 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_LINEAR_16: /* 16-bit linear PCM */
p_sys->fmt.i_codec = VLC_FOURCC( 't','w','o','s' );
p_sys->fmt.audio.i_bitspersample = 16;
p_sys->fmt.audio.i_blockalign = 2 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_LINEAR_24: /* 24-bit linear PCM */
p_sys->fmt.i_codec = VLC_FOURCC( 't','w','o','s' );
p_sys->fmt.audio.i_bitspersample = 24;
p_sys->fmt.audio.i_blockalign = 3 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_LINEAR_32: /* 32-bit linear PCM */
p_sys->fmt.i_codec = VLC_FOURCC( 't','w','o','s' );
p_sys->fmt.audio.i_bitspersample = 32;
p_sys->fmt.audio.i_blockalign = 4 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_FLOAT: /* 32-bit IEEE floating point */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_FLOAT );
p_sys->fmt.audio.i_bitspersample = 32;
p_sys->fmt.audio.i_blockalign = 4 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_DOUBLE: /* 64-bit IEEE floating point */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_DOUBLE );
p_sys->fmt.audio.i_bitspersample = 64;
p_sys->fmt.audio.i_blockalign = 8 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_PCM;
break;
case AU_ADPCM_G721: /* 4-bit CCITT g.721 ADPCM */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G721 );
p_sys->fmt.audio.i_bitspersample = 0;
p_sys->fmt.audio.i_blockalign = 0 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_ADPCM;
break;
case AU_ADPCM_G722: /* CCITT g.722 ADPCM */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G722 );
p_sys->fmt.audio.i_bitspersample = 0;
p_sys->fmt.audio.i_blockalign = 0 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_ADPCM;
break;
case AU_ADPCM_G723_3: /* CCITT g.723 3-bit ADPCM */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G723_3 );
p_sys->fmt.audio.i_bitspersample = 0;
p_sys->fmt.audio.i_blockalign = 0 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_ADPCM;
break;
case AU_ADPCM_G723_5: /* CCITT g.723 5-bit ADPCM */
p_sys->fmt.i_codec = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G723_5 );
p_sys->fmt.audio.i_bitspersample = 0;
p_sys->fmt.audio.i_blockalign = 0 * p_sys->fmt.audio.i_channels;
i_cat = AU_CAT_ADPCM;
break;
default:
msg_Warn( p_demux, "unknow encoding=0x%x", GetDWBE( &hdr[8] ) );
p_sys->fmt.audio.i_bitspersample = 0;
p_sys->fmt.audio.i_blockalign = 0;
i_cat = AU_CAT_UNKNOWN;
break;
}
p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
p_sys->fmt.audio.i_channels *
p_sys->fmt.audio.i_bitspersample;
if( i_cat == AU_CAT_UNKNOWN || i_cat == AU_CAT_ADPCM )
{
p_sys->i_frame_size = 0;
p_sys->i_frame_length = 0;
msg_Err( p_demux, "unsupported codec/type (Please report it)" );
free( p_sys );
return VLC_EGENERIC;
}
if( p_sys->fmt.audio.i_rate == 0 )
{
msg_Err( p_demux, "invalid samplerate: 0" );
free( p_sys );
return VLC_EGENERIC;
}
/* add the es */
p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
/* calculate 50ms frame size/time */
i_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
p_sys->i_frame_size = i_samples * p_sys->fmt.audio.i_channels *
( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
if( p_sys->fmt.audio.i_blockalign > 0 )
{
if( ( i_modulo = p_sys->i_frame_size % p_sys->fmt.audio.i_blockalign ) != 0 )
{
p_sys->i_frame_size += p_sys->fmt.audio.i_blockalign - i_modulo;
}
}
p_sys->i_frame_length = (mtime_t)1000000 *
(mtime_t)i_samples /
(mtime_t)p_sys->fmt.audio.i_rate;
return VLC_SUCCESS;
}
/*****************************************************************************
* Demux: read packet and send them to decoders
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, 1 otherwise
*****************************************************************************/
static int Demux( demux_t *p_demux )
{
demux_sys_t *p_sys = p_demux->p_sys;
block_t *p_block;
/* set PCR */
es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_time );
if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
{
msg_Warn( p_demux, "cannot read data" );
return 0;
}
p_block->i_dts =
p_block->i_pts = VLC_TS_0 + p_sys->i_time;
es_out_Send( p_demux->out, p_sys->es, p_block );
p_sys->i_time += p_sys->i_frame_length;
return 1;
}
/*****************************************************************************
* Close: frees unused data
*****************************************************************************/
static void Close( vlc_object_t * p_this )
{
demux_t *p_demux = (demux_t*)p_this;
demux_sys_t *p_sys = p_demux->p_sys;
free( p_sys );
}
/*****************************************************************************
* Control:
*****************************************************************************/
static int Control( demux_t *p_demux, int i_query, va_list args )
{
demux_sys_t *p_sys = p_demux->p_sys;
return demux_vaControlHelper( p_demux->s, p_sys->i_header_size, -1,
p_sys->fmt.i_bitrate, p_sys->fmt.audio.i_blockalign,
i_query, args );
}
|
