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. Default is s16l." )
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'. ")
57 set_shortname( "Raw Audio" );
58 set_description( N_("Raw audio demuxer") );
59 set_capability( "demux", 0 );
60 set_category( CAT_INPUT );
61 set_subcategory( SUBCAT_INPUT_DEMUX );
62 set_callbacks( Open, Close );
63 add_shortcut( "rawaud" );
64 add_integer( "rawaud-channels", 2, 0, CHANNELS_TEXT, CHANNELS_LONGTEXT, false );
65 add_integer( "rawaud-samplerate", 48000, 0, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false );
66 add_string( "rawaud-fourcc", "s16l", NULL, FOURCC_TEXT, FOURCC_LONGTEXT, false );
67 add_string( "rawaud-lang", "eng", NULL, LANG_TEXT, LANG_LONGTEXT, false);
70 /*****************************************************************************
71 * Definitions of structures used by this plugin
72 *****************************************************************************/
77 unsigned int i_frame_size;
78 unsigned int i_frame_samples;
79 unsigned int i_seek_step;
84 /*****************************************************************************
86 *****************************************************************************/
87 static int Demux( demux_t * );
88 static int Control( demux_t *, int i_query, va_list args );
91 /*****************************************************************************
92 * Open: initializes raw audio demuxer
93 *****************************************************************************/
94 static int Open( vlc_object_t * p_this )
96 demux_t *p_demux = (demux_t*)p_this;
99 /* Set p_input field */
100 p_demux->pf_demux = Demux;
101 p_demux->pf_control = Control;
102 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
106 es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
108 char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" );
109 p_sys->fmt.i_codec = vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc );
112 if( !p_sys->fmt.i_codec )
114 msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
115 es_format_Clean( &p_sys->fmt );
120 // get the bits per sample ratio based on codec
121 switch( p_sys->fmt.i_codec )
125 p_sys->fmt.audio.i_bitspersample = 64;
131 p_sys->fmt.audio.i_bitspersample = 32;
136 p_sys->fmt.audio.i_bitspersample = 24;
141 p_sys->fmt.audio.i_bitspersample = 16;
146 p_sys->fmt.audio.i_bitspersample = 8;
150 msg_Err( p_demux, "unknown fourcc format %4.4s",
151 (char *)&p_sys->fmt.i_codec);
152 es_format_Clean( &p_sys->fmt );
159 p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );
160 p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );
161 p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );
163 if( p_sys->fmt.audio.i_rate <= 0 )
165 msg_Err( p_demux, "invalid sample rate");
166 es_format_Clean( &p_sys->fmt );
171 if( p_sys->fmt.audio.i_channels <= 0 )
173 msg_Err( p_demux, "invalid number of channels");
174 es_format_Clean( &p_sys->fmt );
179 p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
180 p_sys->fmt.audio.i_channels *
181 p_sys->fmt.audio.i_bitspersample;
184 "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",
185 p_sys->fmt.audio.i_channels,
186 p_sys->fmt.audio.i_rate,
187 (char*)&p_sys->fmt.i_codec,
188 p_sys->fmt.audio.i_bitspersample,
189 p_sys->fmt.i_bitrate);
192 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
193 msg_Dbg( p_demux, "elementary stream added");
195 /* initialize timing */
196 date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
197 date_Set( &p_sys->pts, 1 );
199 /* calculate 50ms frame size/time */
200 p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
201 p_sys->i_seek_step = p_sys->fmt.audio.i_channels *
202 ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
203 p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step;
204 msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size);
209 /*****************************************************************************
210 * Close: frees unused data
211 *****************************************************************************/
212 static void Close( vlc_object_t *p_this )
214 demux_t *p_demux = (demux_t*)p_this;
215 demux_sys_t *p_sys = p_demux->p_sys;
217 es_format_Clean( &p_sys->fmt );
221 /*****************************************************************************
222 * Demux: reads and demuxes data packets
223 *****************************************************************************
224 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
225 *****************************************************************************/
226 static int Demux( demux_t *p_demux )
228 demux_sys_t *p_sys = p_demux->p_sys;
231 if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
238 p_block->i_pts = date_Increment( &p_sys->pts, p_sys->i_frame_samples );
240 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
241 es_out_Send( p_demux->out, p_sys->p_es, p_block );
245 /*****************************************************************************
247 *****************************************************************************/
248 static int Control( demux_t *p_demux, int i_query, va_list args )
250 demux_sys_t *p_sys = p_demux->p_sys;
252 return demux_vaControlHelper( p_demux->s, 0, -1,
253 p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );