Commit 1516f040 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
Browse files

Forgotten new file from previous commit

parent e4f4f59e
/*****************************************************************************
* xa.c : xa file input module for vlc
*****************************************************************************
* Copyright (C) 2005 VideoLAN
* $Id$
*
* Authors: Remi Denis-Courmont <fenrir@via.ecp.fr>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/aout.h>
#include <codecs.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
set_description( _("XA demuxer") );
set_category( CAT_INPUT );
set_subcategory( SUBCAT_INPUT_DEMUX );
set_capability( "demux2", 10 );
set_callbacks( Open, Close );
vlc_module_end();
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Demux ( demux_t * );
static int Control( demux_t *, int i_query, va_list args );
struct demux_sys_t
{
es_format_t fmt;
es_out_id_t *p_es;
int64_t i_data_offset;
unsigned int i_data_size;
date_t pts;
};
typedef struct xa_header
{
uint8_t xa_id[4];
uint32_t iSize;
uint16_t wFormatTag;
uint16_t nChannels;
uint32_t nSamplesPerSec;
uint32_t nAvgBytesPerSec;
uint16_t nBlockAlign;
uint16_t wBitsPerSample;
} xa_header;
/*****************************************************************************
* 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;
xa_header p_xa;
uint8_t *p_buf;
/* XA file heuristic */
if( stream_Peek( p_demux->s, &p_buf, sizeof( p_xa ) )
< (signed)sizeof( p_xa ) )
return VLC_EGENERIC;
memcpy( &p_xa, p_buf, sizeof( p_xa ) );
if( ( strncmp( p_xa.xa_id, "XAI", 4 )
&& strncmp( p_xa.xa_id, "XAJ", 4 ) )
|| ( GetWLE( &p_xa.wFormatTag ) != 0x0001)
|| ( GetWLE( &p_xa.wBitsPerSample ) != 16) )
return VLC_EGENERIC;
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
p_sys->p_es = NULL;
/* skip XA header -- cannot fail */
stream_Read( p_demux->s, NULL, sizeof( p_xa ) );
es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
msg_Dbg( p_demux, "assuming EA ADPCM audio format" );
p_sys->fmt.i_codec = VLC_FOURCC('X','A','J',0);
p_sys->fmt.audio.i_rate = GetDWLE( &p_xa.nSamplesPerSec );
p_sys->fmt.audio.i_bytes_per_frame = 15 * GetWLE( &p_xa.nChannels );
p_sys->fmt.audio.i_frame_length = 28; /* 28 samples of 4 bits each */
p_sys->fmt.audio.i_channels = GetWLE ( &p_xa.nChannels );
p_sys->fmt.audio.i_blockalign = p_sys->fmt.audio.i_bytes_per_frame;
p_sys->fmt.audio.i_bitspersample = 4;
p_sys->fmt.i_bitrate = (p_sys->fmt.audio.i_rate
* p_sys->fmt.audio.i_bytes_per_frame * 8)
/ p_sys->fmt.audio.i_frame_length;
p_sys->fmt.i_extra = 0;
p_sys->fmt.p_extra = NULL;
p_sys->i_data_offset = stream_Tell( p_demux->s );
/* FIXME: better computation */
p_sys->i_data_size = p_xa.iSize * 15 / 56;
msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
"freq: %d Hz, bitrate: %dKo/s, blockalign: %d",
(char *)&p_sys->fmt.i_codec, p_sys->fmt.audio.i_channels,
p_sys->fmt.audio.i_rate, p_sys->fmt.i_bitrate / 8192,
p_sys->fmt.audio.i_blockalign );
p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
date_Set( &p_sys->pts, 1 );
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;
int64_t i_offset;
i_offset = stream_Tell( p_demux->s );
if( p_sys->i_data_size > 0 &&
i_offset >= p_sys->i_data_offset + p_sys->i_data_size )
{
/* EOF */
return 0;
}
p_block = stream_Block( p_demux->s, p_sys->fmt.audio.i_bytes_per_frame );
if( p_block == NULL )
{
msg_Warn( p_demux, "cannot read data" );
return 0;
}
p_block->i_dts = p_block->i_pts =
date_Increment( &p_sys->pts, p_sys->fmt.audio.i_frame_length );
es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
es_out_Send( p_demux->out, p_sys->p_es, p_block );
return 1;
}
/*****************************************************************************
* Close: frees unused data
*****************************************************************************/
static void Close ( vlc_object_t * p_this )
{
demux_sys_t *p_sys = ((demux_t *)p_this)->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;
if( i_query == DEMUX_SET_POSITION )
return -1; /* FIXME: progressive encoding - seeking not supported */
return demux2_vaControlHelper( p_demux->s, 0, -1,
p_sys->fmt.i_bitrate,
p_sys->fmt.audio.i_blockalign,
i_query, args );
}
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