modules/demux/rawaud.c

   1 /*****************************************************************************
   2  * rawaud.c : raw audio input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jarmo Torvinen <jarmo.torvinen@jutel.fi>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open ( vlc_object_t * );
  40 static void Close( vlc_object_t * );
  41
  42
  43 #define SAMPLERATE_TEXT N_("Audio samplerate (Hz)")
  44 #define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.")
  45
  46 #define CHANNELS_TEXT N_("Audio channels")
  47 #define CHANNELS_LONGTEXT N_("Audio channels in input stream. Numeric value >0. Default is 2.")
  48
  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." )
  52
  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'. ")
  55
  56 #ifdef WORDS_BIGENDIAN
  57 # define FOURCC_DEFAULT "s16b"
  58 #else
  59 # define FOURCC_DEFAULT "s16l"
  60 #endif
  61
  62 vlc_module_begin();
  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, CHANNELS_TEXT, CHANNELS_LONGTEXT, false );
  71     add_integer( "rawaud-samplerate", 48000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false );
  72     add_string( "rawaud-fourcc", FOURCC_DEFAULT,
  73                 FOURCC_TEXT, FOURCC_LONGTEXT, false );
  74     add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT, false);
  75 vlc_module_end();
  76
  77 /*****************************************************************************
  78  * Definitions of structures used by this plugin
  79  *****************************************************************************/
  80 struct demux_sys_t
  81 {
  82     es_out_id_t *p_es;
  83     es_format_t  fmt;
  84     unsigned int i_frame_size;
  85     unsigned int i_frame_samples;
  86     unsigned int i_seek_step;
  87     date_t       pts;
  88 };
  89
  90
  91 /*****************************************************************************
  92  * Local prototypes
  93  *****************************************************************************/
  94 static int Demux( demux_t * );
  95 static int Control( demux_t *, int i_query, va_list args );
  96
  97
  98 /*****************************************************************************
  99  * Open: initializes raw audio demuxer
 100  *****************************************************************************/
 101 static int Open( vlc_object_t * p_this )
 102 {
 103     demux_t     *p_demux = (demux_t*)p_this;
 104     demux_sys_t *p_sys;
 105
 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 ) );
 110     if( !p_sys )
 111         return VLC_ENOMEM;
 112
 113     es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
 114
 115     char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" );
 116     p_sys->fmt.i_codec = vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc );
 117     free( psz_fourcc );
 118
 119     if( !p_sys->fmt.i_codec )
 120     {
 121         msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
 122         es_format_Clean( &p_sys->fmt );
 123         free( p_sys );
 124         return VLC_EGENERIC;
 125     }
 126
 127     // get the bits per sample ratio based on codec
 128     switch( p_sys->fmt.i_codec )
 129     {
 130
 131         case VLC_CODEC_FL64:
 132             p_sys->fmt.audio.i_bitspersample = 64;
 133             break;
 134
 135         case VLC_CODEC_FL32:
 136         case VLC_CODEC_S32L:
 137         case VLC_CODEC_S32B:
 138             p_sys->fmt.audio.i_bitspersample = 32;
 139             break;
 140
 141         case VLC_CODEC_S24L:
 142         case VLC_CODEC_S24B:
 143             p_sys->fmt.audio.i_bitspersample = 24;
 144             break;
 145
 146         case VLC_CODEC_S16L:
 147         case VLC_CODEC_S16B:
 148             p_sys->fmt.audio.i_bitspersample = 16;
 149             break;
 150
 151         case VLC_CODEC_S8:
 152         case VLC_CODEC_U8:
 153             p_sys->fmt.audio.i_bitspersample = 8;
 154             break;
 155
 156         default:
 157             msg_Err( p_demux, "unknown fourcc format %4.4s",
 158                      (char *)&p_sys->fmt.i_codec);
 159             es_format_Clean( &p_sys->fmt );
 160             free( p_sys );
 161             return VLC_EGENERIC;
 162
 163     }
 164
 165
 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" );
 169
 170     if( p_sys->fmt.audio.i_rate <= 0 )
 171     {
 172       msg_Err( p_demux, "invalid sample rate");
 173       es_format_Clean( &p_sys->fmt );
 174       free( p_sys );
 175       return VLC_EGENERIC;
 176     }
 177
 178     if( p_sys->fmt.audio.i_channels <= 0 )
 179     {
 180       msg_Err( p_demux, "invalid number of channels");
 181       es_format_Clean( &p_sys->fmt );
 182       free( p_sys );
 183       return VLC_EGENERIC;
 184     }
 185
 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;
 189
 190     msg_Dbg( p_demux,
 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);
 197
 198     /* add the es */
 199     p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 200     msg_Dbg( p_demux, "elementary stream added");
 201
 202     /* initialize timing */
 203     date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 204     date_Set( &p_sys->pts, 0 );
 205
 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);
 212
 213     return VLC_SUCCESS;
 214 }
 215
 216 /*****************************************************************************
 217  * Close: frees unused data
 218  *****************************************************************************/
 219 static void Close( vlc_object_t *p_this )
 220 {
 221     demux_t     *p_demux = (demux_t*)p_this;
 222     demux_sys_t *p_sys  = p_demux->p_sys;
 223
 224     es_format_Clean( &p_sys->fmt );
 225     free( p_sys );
 226 }
 227
 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 )
 234 {
 235     demux_sys_t *p_sys  = p_demux->p_sys;
 236     block_t     *p_block;
 237
 238     if( ( p_block = stream_Block( p_demux->s, p_sys->i_frame_size ) ) == NULL )
 239     {
 240         /* EOF */
 241         return 0;
 242     }
 243
 244     p_block->i_dts =
 245     p_block->i_pts = VLC_TS_0 + date_Get( &p_sys->pts );
 246
 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 );
 249
 250     date_Increment( &p_sys->pts, p_sys->i_frame_samples );
 251
 252     return 1;
 253 }
 254
 255 /*****************************************************************************
 256  * Control:
 257  *****************************************************************************/
 258 static int Control( demux_t *p_demux, int i_query, va_list args )
 259 {
 260     demux_sys_t *p_sys  = p_demux->p_sys;
 261
 262     return demux_vaControlHelper( p_demux->s, 0, -1,
 263                                    p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );
 264 }