2005-03-07 14:10:29 +01:00
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/*****************************************************************************
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* xa.c : xa file input module for vlc
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*****************************************************************************
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* Copyright (C) 2005 VideoLAN
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* $Id$
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*
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2005-03-07 14:12:51 +01:00
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* Authors: Remi Denis-Courmont <rem # via.ecp.fr>
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2005-03-07 14:10:29 +01:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <vlc/vlc.h>
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#include <vlc/input.h>
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#include <vlc/aout.h>
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#include <codecs.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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vlc_module_begin();
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set_description( _("XA demuxer") );
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set_category( CAT_INPUT );
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set_subcategory( SUBCAT_INPUT_DEMUX );
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set_capability( "demux2", 10 );
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set_callbacks( Open, Close );
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vlc_module_end();
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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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struct demux_sys_t
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{
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es_format_t fmt;
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es_out_id_t *p_es;
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int64_t i_data_offset;
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unsigned int i_data_size;
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date_t pts;
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};
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2005-03-07 14:26:33 +01:00
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typedef struct xa_header_y
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2005-03-07 14:10:29 +01:00
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{
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2005-03-07 14:26:33 +01:00
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uint8_t xa_id[4];
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uint32_t iSize;
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2005-03-07 14:10:29 +01:00
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2005-03-07 14:26:33 +01:00
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uint16_t wFormatTag;
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uint16_t nChannels;
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uint32_t nSamplesPerSec;
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uint32_t nAvgBytesPerSec;
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uint16_t nBlockAlign;
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uint16_t wBitsPerSample;
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} xa_header_t;
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2005-03-07 14:10:29 +01:00
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/*****************************************************************************
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* Open: check file and initializes structures
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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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2005-03-07 14:26:33 +01:00
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xa_header_t p_xa;
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2005-03-07 14:10:29 +01:00
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uint8_t *p_buf;
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/* XA file heuristic */
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if( stream_Peek( p_demux->s, &p_buf, sizeof( p_xa ) )
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< (signed)sizeof( p_xa ) )
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return VLC_EGENERIC;
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memcpy( &p_xa, p_buf, sizeof( p_xa ) );
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if( ( strncmp( p_xa.xa_id, "XAI", 4 )
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&& strncmp( p_xa.xa_id, "XAJ", 4 ) )
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|| ( GetWLE( &p_xa.wFormatTag ) != 0x0001)
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|| ( GetWLE( &p_xa.wBitsPerSample ) != 16) )
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return VLC_EGENERIC;
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p_demux->pf_demux = Demux;
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p_demux->pf_control = Control;
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p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
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p_sys->p_es = NULL;
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/* skip XA header -- cannot fail */
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stream_Read( p_demux->s, NULL, sizeof( p_xa ) );
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es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
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msg_Dbg( p_demux, "assuming EA ADPCM audio format" );
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p_sys->fmt.i_codec = VLC_FOURCC('X','A','J',0);
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p_sys->fmt.audio.i_rate = GetDWLE( &p_xa.nSamplesPerSec );
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p_sys->fmt.audio.i_bytes_per_frame = 15 * GetWLE( &p_xa.nChannels );
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p_sys->fmt.audio.i_frame_length = 28; /* 28 samples of 4 bits each */
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p_sys->fmt.audio.i_channels = GetWLE ( &p_xa.nChannels );
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p_sys->fmt.audio.i_blockalign = p_sys->fmt.audio.i_bytes_per_frame;
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p_sys->fmt.audio.i_bitspersample = 4;
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p_sys->fmt.i_bitrate = (p_sys->fmt.audio.i_rate
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* p_sys->fmt.audio.i_bytes_per_frame * 8)
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/ p_sys->fmt.audio.i_frame_length;
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p_sys->fmt.i_extra = 0;
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p_sys->fmt.p_extra = NULL;
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p_sys->i_data_offset = stream_Tell( p_demux->s );
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/* FIXME: better computation */
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p_sys->i_data_size = p_xa.iSize * 15 / 56;
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msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
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"freq: %d Hz, bitrate: %dKo/s, blockalign: %d",
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(char *)&p_sys->fmt.i_codec, p_sys->fmt.audio.i_channels,
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p_sys->fmt.audio.i_rate, p_sys->fmt.i_bitrate / 8192,
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p_sys->fmt.audio.i_blockalign );
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p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
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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, 1 );
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Demux: read packet and send them to decoders
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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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int64_t i_offset;
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i_offset = stream_Tell( p_demux->s );
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if( p_sys->i_data_size > 0 &&
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i_offset >= p_sys->i_data_offset + p_sys->i_data_size )
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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 = stream_Block( p_demux->s, p_sys->fmt.audio.i_bytes_per_frame );
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if( p_block == NULL )
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{
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msg_Warn( p_demux, "cannot read data" );
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return 0;
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}
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p_block->i_dts = p_block->i_pts =
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date_Increment( &p_sys->pts, p_sys->fmt.audio.i_frame_length );
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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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return 1;
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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_sys_t *p_sys = ((demux_t *)p_this)->p_sys;
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free( p_sys );
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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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if( i_query == DEMUX_SET_POSITION )
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return -1; /* FIXME: progressive encoding - seeking not supported */
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return demux2_vaControlHelper( p_demux->s, 0, -1,
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p_sys->fmt.i_bitrate,
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p_sys->fmt.audio.i_blockalign,
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i_query, args );
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}
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