1 /*****************************************************************************
2 * rawaud.c : raw audio input module for vlc
3 *****************************************************************************
4 * Copyright (C) 2009 the VideoLAN team
7 * Authors: Jarmo Torvinen <jarmo.torvinen@jutel.fi>
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 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Open ( vlc_object_t
* );
40 static void Close( vlc_object_t
* );
43 #define SAMPLERATE_TEXT N_("Audio samplerate (Hz)")
44 #define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.")
46 #define CHANNELS_TEXT N_("Audio channels")
47 #define CHANNELS_LONGTEXT N_("Audio channels in input stream. Numeric value >0. Default is 2.")
49 #define FOURCC_TEXT N_("FOURCC code of raw input format")
50 #define FOURCC_LONGTEXT N_( \
51 "FOURCC code of the raw input format. This is a four character string." )
53 #define LANG_TEXT N_("Forces the audio language")
54 #define LANG_LONGTEXT N_("Forces the audio language for the output mux. Three letter ISO639 code. Default is 'eng'. ")
56 #ifdef WORDS_BIGENDIAN
57 # define FOURCC_DEFAULT "s16b"
59 # define FOURCC_DEFAULT "s16l"
63 set_shortname( "Raw Audio" );
64 set_description( N_("Raw audio demuxer") );
65 set_capability( "demux", 0 );
66 set_category( CAT_INPUT
);
67 set_subcategory( SUBCAT_INPUT_DEMUX
);
68 set_callbacks( Open
, Close
);
69 add_shortcut( "rawaud" );
70 add_integer( "rawaud-channels", 2, 0, CHANNELS_TEXT
, CHANNELS_LONGTEXT
, false );
71 add_integer( "rawaud-samplerate", 48000, 0, SAMPLERATE_TEXT
, SAMPLERATE_LONGTEXT
, false );
72 add_string( "rawaud-fourcc", FOURCC_DEFAULT
, NULL
,
73 FOURCC_TEXT
, FOURCC_LONGTEXT
, false );
74 add_string( "rawaud-lang", "eng", NULL
, LANG_TEXT
, LANG_LONGTEXT
, false);
77 /*****************************************************************************
78 * Definitions of structures used by this plugin
79 *****************************************************************************/
84 unsigned int i_frame_size
;
85 unsigned int i_frame_samples
;
86 unsigned int i_seek_step
;
91 /*****************************************************************************
93 *****************************************************************************/
94 static int Demux( demux_t
* );
95 static int Control( demux_t
*, int i_query
, va_list args
);
98 /*****************************************************************************
99 * Open: initializes raw audio demuxer
100 *****************************************************************************/
101 static int Open( vlc_object_t
* p_this
)
103 demux_t
*p_demux
= (demux_t
*)p_this
;
106 /* Set p_input field */
107 p_demux
->pf_demux
= Demux
;
108 p_demux
->pf_control
= Control
;
109 p_demux
->p_sys
= p_sys
= malloc( sizeof( demux_sys_t
) );
113 es_format_Init( &p_sys
->fmt
, AUDIO_ES
, 0 );
115 char *psz_fourcc
= var_CreateGetString( p_demux
, "rawaud-fourcc" );
116 p_sys
->fmt
.i_codec
= vlc_fourcc_GetCodecFromString( AUDIO_ES
, psz_fourcc
);
119 if( !p_sys
->fmt
.i_codec
)
121 msg_Err( p_demux
, "rawaud-fourcc must be a 4 character string");
122 es_format_Clean( &p_sys
->fmt
);
127 // get the bits per sample ratio based on codec
128 switch( p_sys
->fmt
.i_codec
)
132 p_sys
->fmt
.audio
.i_bitspersample
= 64;
138 p_sys
->fmt
.audio
.i_bitspersample
= 32;
143 p_sys
->fmt
.audio
.i_bitspersample
= 24;
148 p_sys
->fmt
.audio
.i_bitspersample
= 16;
153 p_sys
->fmt
.audio
.i_bitspersample
= 8;
157 msg_Err( p_demux
, "unknown fourcc format %4.4s",
158 (char *)&p_sys
->fmt
.i_codec
);
159 es_format_Clean( &p_sys
->fmt
);
166 p_sys
->fmt
.psz_language
= var_CreateGetString( p_demux
, "rawaud-lang" );
167 p_sys
->fmt
.audio
.i_channels
= var_CreateGetInteger( p_demux
, "rawaud-channels" );
168 p_sys
->fmt
.audio
.i_rate
= var_CreateGetInteger( p_demux
, "rawaud-samplerate" );
170 if( p_sys
->fmt
.audio
.i_rate
<= 0 )
172 msg_Err( p_demux
, "invalid sample rate");
173 es_format_Clean( &p_sys
->fmt
);
178 if( p_sys
->fmt
.audio
.i_channels
<= 0 )
180 msg_Err( p_demux
, "invalid number of channels");
181 es_format_Clean( &p_sys
->fmt
);
186 p_sys
->fmt
.i_bitrate
= p_sys
->fmt
.audio
.i_rate
*
187 p_sys
->fmt
.audio
.i_channels
*
188 p_sys
->fmt
.audio
.i_bitspersample
;
191 "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",
192 p_sys
->fmt
.audio
.i_channels
,
193 p_sys
->fmt
.audio
.i_rate
,
194 (char*)&p_sys
->fmt
.i_codec
,
195 p_sys
->fmt
.audio
.i_bitspersample
,
196 p_sys
->fmt
.i_bitrate
);
199 p_sys
->p_es
= es_out_Add( p_demux
->out
, &p_sys
->fmt
);
200 msg_Dbg( p_demux
, "elementary stream added");
202 /* initialize timing */
203 date_Init( &p_sys
->pts
, p_sys
->fmt
.audio
.i_rate
, 1 );
204 date_Set( &p_sys
->pts
, 0 );
206 /* calculate 50ms frame size/time */
207 p_sys
->i_frame_samples
= __MAX( p_sys
->fmt
.audio
.i_rate
/ 20, 1 );
208 p_sys
->i_seek_step
= p_sys
->fmt
.audio
.i_channels
*
209 ( (p_sys
->fmt
.audio
.i_bitspersample
+ 7) / 8 );
210 p_sys
->i_frame_size
= p_sys
->i_frame_samples
* p_sys
->i_seek_step
;
211 msg_Dbg( p_demux
, "frame size is %d bytes ", p_sys
->i_frame_size
);
216 /*****************************************************************************
217 * Close: frees unused data
218 *****************************************************************************/
219 static void Close( vlc_object_t
*p_this
)
221 demux_t
*p_demux
= (demux_t
*)p_this
;
222 demux_sys_t
*p_sys
= p_demux
->p_sys
;
224 es_format_Clean( &p_sys
->fmt
);
228 /*****************************************************************************
229 * Demux: reads and demuxes data packets
230 *****************************************************************************
231 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
232 *****************************************************************************/
233 static int Demux( demux_t
*p_demux
)
235 demux_sys_t
*p_sys
= p_demux
->p_sys
;
238 if( ( p_block
= stream_Block( p_demux
->s
, p_sys
->i_frame_size
) ) == NULL
)
245 p_block
->i_pts
= VLC_TS_0
+ date_Get( &p_sys
->pts
);
247 es_out_Control( p_demux
->out
, ES_OUT_SET_PCR
, p_block
->i_pts
);
248 es_out_Send( p_demux
->out
, p_sys
->p_es
, p_block
);
250 date_Increment( &p_sys
->pts
, p_sys
->i_frame_samples
);
255 /*****************************************************************************
257 *****************************************************************************/
258 static int Control( demux_t
*p_demux
, int i_query
, va_list args
)
260 demux_sys_t
*p_sys
= p_demux
->p_sys
;
262 return demux_vaControlHelper( p_demux
->s
, 0, -1,
263 p_sys
->fmt
.i_bitrate
, p_sys
->i_seek_step
, i_query
, args
);