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" );
117 if( ( psz_fourcc == NULL ? 0 : strlen( psz_fourcc ) ) != 4 )
119 msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
121 es_format_Clean( &p_sys->fmt );
126 p_sys->fmt.i_codec = VLC_FOURCC( psz_fourcc[0], psz_fourcc[1],
127 psz_fourcc[2], psz_fourcc[3] );
130 // get the bits per sample ratio based on codec
131 switch( p_sys->fmt.i_codec )
134 case VLC_FOURCC( 'f', 'l', '6', '4' ):
135 p_sys->fmt.audio.i_bitspersample = 64;
138 case VLC_FOURCC( 'f', 'l', '3', '2' ):
139 case VLC_FOURCC( 's', '3', '2', 'l' ):
140 case VLC_FOURCC( 's', '3', '2', 'b' ):
141 case VLC_FOURCC( 'i', 'n', '3', '2' ):
142 p_sys->fmt.audio.i_bitspersample = 32;
145 case VLC_FOURCC( 's', '2', '4', 'l' ):
146 case VLC_FOURCC( 's', '2', '4', 'b' ):
147 case VLC_FOURCC( 'i', 'n', '2', '4' ):
148 case VLC_FOURCC( '4', '2', 'n', 'i' ):
149 p_sys->fmt.audio.i_bitspersample = 24;
152 case VLC_FOURCC( 's', '1', '6', 'l' ):
153 case VLC_FOURCC( 's', '1', '6', 'b' ):
154 p_sys->fmt.audio.i_bitspersample = 16;
157 case VLC_FOURCC( 's', '8', ' ', ' ' ):
158 case VLC_FOURCC( 'u', '8', ' ', ' ' ):
159 p_sys->fmt.audio.i_bitspersample = 8;
163 msg_Err( p_demux, "unknown fourcc format %4.4s",
164 (char *)&p_sys->fmt.i_codec);
165 es_format_Clean( &p_sys->fmt );
172 p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );
173 p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );
174 p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );
176 if( p_sys->fmt.audio.i_rate <= 0 )
178 msg_Err( p_demux, "invalid sample rate");
179 es_format_Clean( &p_sys->fmt );
184 if( p_sys->fmt.audio.i_channels <= 0 )
186 msg_Err( p_demux, "invalid number of channels");
187 es_format_Clean( &p_sys->fmt );
192 p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
193 p_sys->fmt.audio.i_channels *
194 p_sys->fmt.audio.i_bitspersample;
197 "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",
198 p_sys->fmt.audio.i_channels,
199 p_sys->fmt.audio.i_rate,
200 (char*)&p_sys->fmt.i_codec,
201 p_sys->fmt.audio.i_bitspersample,
202 p_sys->fmt.i_bitrate);
205 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
206 msg_Dbg( p_demux, "elementary stream added");
208 /* initialize timing */
209 date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
210 date_Set( &p_sys->pts, 1 );
212 /* calculate 50ms frame size/time */
213 p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
214 p_sys->i_seek_step = p_sys->fmt.audio.i_channels *
215 ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
216 p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step;
217 msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size);
222 /*****************************************************************************
223 * Close: frees unused data
224 *****************************************************************************/
225 static void Close( vlc_object_t *p_this )
227 demux_t *p_demux = (demux_t*)p_this;
228 demux_sys_t *p_sys = p_demux->p_sys;
230 es_format_Clean( &p_sys->fmt );
234 /*****************************************************************************
235 * Demux: reads and demuxes data packets
236 *****************************************************************************
237 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
238 *****************************************************************************/
239 static int Demux( demux_t *p_demux )
241 demux_sys_t *p_sys = p_demux->p_sys;
244 if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
251 p_block->i_pts = date_Increment( &p_sys->pts, p_sys->i_frame_samples );
253 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
254 es_out_Send( p_demux->out, p_sys->p_es, p_block );
258 /*****************************************************************************
260 *****************************************************************************/
261 static int Control( demux_t *p_demux, int i_query, va_list args )
263 demux_sys_t *p_sys = p_demux->p_sys;
265 return demux_vaControlHelper( p_demux->s, 0, -1,
266 p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );