modules/demux/rawaud.c

   1 /*****************************************************************************
   2  * rawaud.c : raw audio input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2009 VLC authors and VideoLAN
   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 it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * 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         change_safe()
  72     add_integer( "rawaud-samplerate", 48000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false );
  73         change_safe()
  74     add_string( "rawaud-fourcc", FOURCC_DEFAULT,
  75                 FOURCC_TEXT, FOURCC_LONGTEXT, false );
  76         change_safe()
  77     add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT, false);
  78 vlc_module_end();
  79
  80 /*****************************************************************************
  81  * Definitions of structures used by this plugin
  82  *****************************************************************************/
  83 struct demux_sys_t
  84 {
  85     es_out_id_t *p_es;
  86     es_format_t  fmt;
  87     unsigned int i_frame_size;
  88     unsigned int i_frame_samples;
  89     unsigned int i_seek_step;
  90     date_t       pts;
  91 };
  92
  93
  94 /*****************************************************************************
  95  * Local prototypes
  96  *****************************************************************************/
  97 static int Demux( demux_t * );
  98 static int Control( demux_t *, int i_query, va_list args );
  99
 100
 101 /*****************************************************************************
 102  * Open: initializes raw audio demuxer
 103  *****************************************************************************/
 104 static int Open( vlc_object_t * p_this )
 105 {
 106     demux_t     *p_demux = (demux_t*)p_this;
 107     demux_sys_t *p_sys;
 108
 109     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 110     if( !p_sys )
 111         return VLC_ENOMEM;
 112
 113     char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" );
 114     es_format_Init( &p_sys->fmt, AUDIO_ES,
 115                     vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc ) );
 116     free( psz_fourcc );
 117
 118     if( !p_sys->fmt.i_codec )
 119     {
 120         msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
 121         es_format_Clean( &p_sys->fmt );
 122         free( p_sys );
 123         return VLC_EGENERIC;
 124     }
 125
 126     // get the bits per sample ratio based on codec
 127     switch( p_sys->fmt.i_codec )
 128     {
 129
 130         case VLC_CODEC_FL64:
 131             p_sys->fmt.audio.i_bitspersample = 64;
 132             break;
 133
 134         case VLC_CODEC_FL32:
 135         case VLC_CODEC_S32L:
 136         case VLC_CODEC_S32B:
 137             p_sys->fmt.audio.i_bitspersample = 32;
 138             break;
 139
 140         case VLC_CODEC_S24L:
 141         case VLC_CODEC_S24B:
 142             p_sys->fmt.audio.i_bitspersample = 24;
 143             break;
 144
 145         case VLC_CODEC_S16L:
 146         case VLC_CODEC_S16B:
 147             p_sys->fmt.audio.i_bitspersample = 16;
 148             break;
 149
 150         case VLC_CODEC_S8:
 151         case VLC_CODEC_U8:
 152             p_sys->fmt.audio.i_bitspersample = 8;
 153             break;
 154
 155         default:
 156             msg_Err( p_demux, "unknown fourcc format %4.4s",
 157                     (char *)&p_sys->fmt.i_codec);
 158             es_format_Clean( &p_sys->fmt );
 159             free( p_sys );
 160             return VLC_EGENERIC;
 161
 162     }
 163
 164
 165     p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );
 166     p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );
 167     p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );
 168
 169     if( p_sys->fmt.audio.i_rate == 0 || p_sys->fmt.audio.i_rate > 384000 )
 170     {
 171         msg_Err( p_demux, "invalid sample rate");
 172         es_format_Clean( &p_sys->fmt );
 173         free( p_sys );
 174         return VLC_EGENERIC;
 175     }
 176
 177     if( p_sys->fmt.audio.i_channels == 0 || p_sys->fmt.audio.i_channels > 32 )
 178     {
 179         msg_Err( p_demux, "invalid number of channels");
 180         es_format_Clean( &p_sys->fmt );
 181         free( p_sys );
 182         return VLC_EGENERIC;
 183     }
 184
 185     p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
 186                            p_sys->fmt.audio.i_channels *
 187                            p_sys->fmt.audio.i_bitspersample;
 188
 189     if( p_sys->fmt.i_bitrate > 50000000)
 190     {
 191         msg_Err( p_demux, "invalid bitrate");
 192         es_format_Clean( &p_sys->fmt );
 193         free( p_sys );
 194         return VLC_EGENERIC;
 195     }
 196
 197     msg_Dbg( p_demux,
 198             "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",
 199             p_sys->fmt.audio.i_channels,
 200             p_sys->fmt.audio.i_rate,
 201             (char*)&p_sys->fmt.i_codec,
 202             p_sys->fmt.audio.i_bitspersample,
 203             p_sys->fmt.i_bitrate);
 204
 205     /* add the es */
 206     p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 207     msg_Dbg( p_demux, "elementary stream added");
 208
 209     /* initialize timing */
 210     date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 211     date_Set( &p_sys->pts, 0 );
 212
 213     /* calculate 50ms frame size/time */
 214     p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
 215     p_sys->i_seek_step  = p_sys->fmt.audio.i_channels *
 216                           ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
 217     p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step;
 218     msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size);
 219
 220     p_demux->pf_demux   = Demux;
 221     p_demux->pf_control = Control;
 222     return VLC_SUCCESS;
 223 }
 224
 225 /*****************************************************************************
 226  * Close: frees unused data
 227  *****************************************************************************/
 228 static void Close( vlc_object_t *p_this )
 229 {
 230     demux_t     *p_demux = (demux_t*)p_this;
 231     demux_sys_t *p_sys  = p_demux->p_sys;
 232
 233     es_format_Clean( &p_sys->fmt );
 234     free( p_sys );
 235 }
 236
 237 /*****************************************************************************
 238  * Demux: reads and demuxes data packets
 239  *****************************************************************************
 240  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 241  *****************************************************************************/
 242 static int Demux( demux_t *p_demux )
 243 {
 244     demux_sys_t *p_sys  = p_demux->p_sys;
 245     block_t     *p_block;
 246
 247     p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size );
 248     if( p_block == NULL )
 249     {
 250         /* EOF */
 251         return 0;
 252     }
 253
 254     p_block->i_dts = p_block->i_pts = VLC_TS_0 + date_Get( &p_sys->pts );
 255
 256     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 257     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 258
 259     date_Increment( &p_sys->pts, p_sys->i_frame_samples );
 260
 261     return 1;
 262 }
 263
 264 /*****************************************************************************
 265  * Control:
 266  *****************************************************************************/
 267 static int Control( demux_t *p_demux, int i_query, va_list args )
 268 {
 269     demux_sys_t *p_sys  = p_demux->p_sys;
 270
 271     return demux_vaControlHelper( p_demux->s, 0, -1,
 272                                   p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );
 273 }