1 /*****************************************************************************
2 * xa.c : xa file demux module for vlc
3 *****************************************************************************
4 * Copyright (C) 2005 Rémi Denis-Courmont
7 * Authors: Rémi Denis-Courmont <rem # videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
29 #include <vlc_demux.h>
31 #include <vlc_codecs.h>
33 /*****************************************************************************
35 *****************************************************************************/
36 static int Open ( vlc_object_t * );
37 static void Close( vlc_object_t * );
40 set_description( _("XA demuxer") );
41 set_category( CAT_INPUT );
42 set_subcategory( SUBCAT_INPUT_DEMUX );
43 set_capability( "demux2", 10 );
44 set_callbacks( Open, Close );
47 /*****************************************************************************
49 *****************************************************************************/
50 static int Demux ( demux_t * );
51 static int Control( demux_t *, int i_query, va_list args );
58 int64_t i_data_offset;
59 unsigned int i_data_size;
64 typedef struct xa_header_t
71 uint32_t nSamplesPerSec;
72 uint32_t nAvgBytesPerSec;
74 uint16_t wBitsPerSample;
78 /*****************************************************************************
79 * Open: check file and initializes structures
80 *****************************************************************************/
81 static int Open( vlc_object_t * p_this )
83 demux_t *p_demux = (demux_t*)p_this;
88 /* XA file heuristic */
89 if( stream_Peek( p_demux->s, &p_buf, sizeof( p_xa ) )
90 < (signed)sizeof( p_xa ) )
93 memcpy( &p_xa, p_buf, sizeof( p_xa ) );
94 if( ( strncmp( p_xa.xa_id, "XAI", 4 )
95 && strncmp( p_xa.xa_id, "XAJ", 4 ) )
96 || ( GetWLE( &p_xa.wFormatTag ) != 0x0001)
97 || ( GetWLE( &p_xa.wBitsPerSample ) != 16) )
100 p_demux->pf_demux = Demux;
101 p_demux->pf_control = Control;
102 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
105 /* skip XA header -- cannot fail */
106 stream_Read( p_demux->s, NULL, sizeof( p_xa ) );
108 es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC('X','A','J',0) );
110 msg_Dbg( p_demux, "assuming EA ADPCM audio codec" );
111 p_sys->fmt.audio.i_rate = GetDWLE( &p_xa.nSamplesPerSec );
112 p_sys->fmt.audio.i_bytes_per_frame = 15 * GetWLE( &p_xa.nChannels );
113 p_sys->fmt.audio.i_frame_length = 28; /* 28 samples of 4 bits each */
115 p_sys->fmt.audio.i_channels = GetWLE ( &p_xa.nChannels );
116 p_sys->fmt.audio.i_blockalign = p_sys->fmt.audio.i_bytes_per_frame;
117 p_sys->fmt.audio.i_bitspersample = 16;
118 p_sys->fmt.i_bitrate = (p_sys->fmt.audio.i_rate
119 * p_sys->fmt.audio.i_bytes_per_frame * 8)
120 / p_sys->fmt.audio.i_frame_length;
121 p_sys->fmt.i_extra = 0;
122 p_sys->fmt.p_extra = NULL;
124 p_sys->i_data_offset = stream_Tell( p_demux->s );
125 /* FIXME: better computation */
126 p_sys->i_data_size = p_xa.iSize * 15 / 56;
128 msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
129 "freq: %d Hz, bitrate: %dKo/s, blockalign: %d",
130 (char *)&p_sys->fmt.i_codec, p_sys->fmt.audio.i_channels,
131 p_sys->fmt.audio.i_rate, p_sys->fmt.i_bitrate / 8192,
132 p_sys->fmt.audio.i_blockalign );
134 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
136 date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
137 date_Set( &p_sys->pts, 1 );
142 /*****************************************************************************
143 * Demux: read packet and send them to decoders
144 *****************************************************************************
145 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
146 *****************************************************************************/
147 static int Demux( demux_t *p_demux )
149 demux_sys_t *p_sys = p_demux->p_sys;
153 i_offset = stream_Tell( p_demux->s );
155 if( p_sys->i_data_size > 0 &&
156 i_offset >= p_sys->i_data_offset + p_sys->i_data_size )
162 p_block = stream_Block( p_demux->s, p_sys->fmt.audio.i_bytes_per_frame );
163 if( p_block == NULL )
165 msg_Warn( p_demux, "cannot read data" );
169 p_block->i_dts = p_block->i_pts =
170 date_Increment( &p_sys->pts, p_sys->fmt.audio.i_frame_length );
172 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
174 es_out_Send( p_demux->out, p_sys->p_es, p_block );
179 /*****************************************************************************
180 * Close: frees unused data
181 *****************************************************************************/
182 static void Close ( vlc_object_t * p_this )
184 demux_sys_t *p_sys = ((demux_t *)p_this)->p_sys;
189 /*****************************************************************************
191 *****************************************************************************/
192 static int Control( demux_t *p_demux, int i_query, va_list args )
194 demux_sys_t *p_sys = p_demux->p_sys;
196 return demux2_vaControlHelper( p_demux->s, p_sys->i_data_offset,
197 p_sys->i_data_size ? p_sys->i_data_offset
198 + p_sys->i_data_size : -1,
199 p_sys->fmt.i_bitrate,
200 p_sys->fmt.audio.i_blockalign,