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/*****************************************************************************
* xa.c : xa file demux module for vlc
*****************************************************************************
* Copyright (C) 2005 Rémi Denis-Courmont
* $Id: 850352543c303d5a2e547d953394294c64201e5a $
*
* Authors: Rémi Denis-Courmont <rem # videolan.org>
*
* 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>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin ()
set_description( N_("XA demuxer") )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_DEMUX )
set_capability( "demux", 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_out_id_t *p_es;
int64_t i_data_offset;
unsigned int i_data_size;
unsigned int i_block_frames;
unsigned int i_frame_size;
unsigned int i_bitrate;
date_t pts;
};
typedef struct xa_header_t
{
char 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_t;
#define FRAME_LENGTH 28 /* samples per frame */
/*****************************************************************************
* 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_t p_xa;
const 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_sys = malloc( sizeof( demux_sys_t ) );
if( unlikely( p_sys == NULL ) )
return VLC_ENOMEM;
p_demux->pf_demux = Demux;
p_demux->pf_control = Control;
p_demux->p_sys = p_sys;
p_sys->p_es = NULL;
/* skip XA header -- cannot fail */
stream_Read( p_demux->s, NULL, sizeof( p_xa ) );
es_format_t fmt;
es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC('X','A','J',0) );
msg_Dbg( p_demux, "assuming EA ADPCM audio codec" );
fmt.audio.i_rate = GetDWLE( &p_xa.nSamplesPerSec );
fmt.audio.i_bytes_per_frame = 15 * GetWLE( &p_xa.nChannels );
fmt.audio.i_frame_length = FRAME_LENGTH;
fmt.audio.i_channels = GetWLE ( &p_xa.nChannels );
fmt.audio.i_blockalign = fmt.audio.i_bytes_per_frame;
fmt.audio.i_bitspersample = 16;
fmt.i_bitrate = (fmt.audio.i_rate * fmt.audio.i_bytes_per_frame * 8)
/ fmt.audio.i_frame_length;
p_sys->i_data_offset = stream_Tell( p_demux->s );
/* FIXME: better computation */
p_sys->i_data_size = p_xa.iSize * 15 / 56;
/* How many frames per block (1:1 is too CPU intensive) */
p_sys->i_block_frames = fmt.audio.i_rate / (FRAME_LENGTH * 20) + 1;
p_sys->i_frame_size = fmt.audio.i_bytes_per_frame;
p_sys->i_bitrate = fmt.i_bitrate;
msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
"freq: %d Hz, bitrate: %dKo/s, blockalign: %d",
(char *)&fmt.i_codec, fmt.audio.i_channels, fmt.audio.i_rate,
fmt.i_bitrate / 8192, fmt.audio.i_blockalign );
if( fmt.audio.i_rate == 0 || fmt.audio.i_channels == 0 )
{
free( p_sys );
return VLC_EGENERIC;
}
p_sys->p_es = es_out_Add( p_demux->out, &fmt );
date_Init( &p_sys->pts, fmt.audio.i_rate, 1 );
date_Set( &p_sys->pts, VLC_TS_0 );
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;
unsigned i_frames = p_sys->i_block_frames;
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->i_frame_size * i_frames );
if( p_block == NULL )
{
msg_Warn( p_demux, "cannot read data" );
return 0;
}
i_frames = p_block->i_buffer / p_sys->i_frame_size;
p_block->i_dts = p_block->i_pts = date_Get( &p_sys->pts );
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 );
date_Increment( &p_sys->pts, i_frames * FRAME_LENGTH );
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;
return demux_vaControlHelper( p_demux->s, p_sys->i_data_offset,
p_sys->i_data_size ? p_sys->i_data_offset
+ p_sys->i_data_size : -1,
p_sys->i_bitrate, p_sys->i_frame_size,
i_query, args );
}
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