Forgotten new file from previous commit

modules/demux/xa.c

+/*****************************************************************************
+ * 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 );
+}