modules/demux/rawaud.c

   1 /*****************************************************************************
   2  * rawaud.c : raw audio input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2009 VLC authors and VideoLAN
   5  *
   6  * Authors: Jarmo Torvinen <jarmo.torvinen@jutel.fi>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_demux.h>
  34
  35 /*****************************************************************************
  36  * Module descriptor
  37  *****************************************************************************/
  38 static int  Open ( vlc_object_t * );
  39 static void Close( vlc_object_t * );
  40
  41
  42 #define SAMPLERATE_TEXT N_("Audio samplerate (Hz)")
  43 #define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.")
  44
  45 #define CHANNELS_TEXT N_("Audio channels")
  46 #define CHANNELS_LONGTEXT N_("Audio channels in input stream. Numeric value >0. Default is 2.")
  47
  48 #define FOURCC_TEXT N_("FOURCC code of raw input format")
  49 #define FOURCC_LONGTEXT N_( \
  50     "FOURCC code of the raw input format. This is a four character string." )
  51
  52 #define LANG_TEXT N_("Forces the audio language")
  53 #define LANG_LONGTEXT N_("Forces the audio language for the output mux. Three letter ISO639 code. Default is 'eng'.")
  54
  55 #ifdef WORDS_BIGENDIAN
  56 # define FOURCC_DEFAULT "s16b"
  57 #else
  58 # define FOURCC_DEFAULT "s16l"
  59 #endif
  60
  61 vlc_module_begin();
  62     set_shortname( "Raw Audio" );
  63     set_description( N_("Raw audio demuxer") );
  64     set_capability( "demux", 0 );
  65     set_category( CAT_INPUT );
  66     set_subcategory( SUBCAT_INPUT_DEMUX );
  67     set_callbacks( Open, Close );
  68     add_shortcut( "rawaud" );
  69     add_integer( "rawaud-channels", 2, CHANNELS_TEXT, CHANNELS_LONGTEXT, false );
  70         change_safe()
  71     add_integer( "rawaud-samplerate", 48000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT, false );
  72         change_safe()
  73     add_string( "rawaud-fourcc", FOURCC_DEFAULT,
  74                 FOURCC_TEXT, FOURCC_LONGTEXT, false );
  75         change_safe()
  76     add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT, false);
  77 vlc_module_end();
  78
  79 /*****************************************************************************
  80  * Definitions of structures used by this plugin
  81  *****************************************************************************/
  82 typedef struct
  83 {
  84     es_out_id_t *p_es;
  85     es_format_t  fmt;
  86     unsigned int i_frame_size;
  87     unsigned int i_frame_samples;
  88     unsigned int i_seek_step;
  89     date_t       pts;
  90 } demux_sys_t;
  91
  92
  93 /*****************************************************************************
  94  * Local prototypes
  95  *****************************************************************************/
  96 static int Demux( demux_t * );
  97 static int Control( demux_t *, int i_query, va_list args );
  98
  99
 100 /*****************************************************************************
 101  * Open: initializes raw audio demuxer
 102  *****************************************************************************/
 103 static int Open( vlc_object_t * p_this )
 104 {
 105     demux_t     *p_demux = (demux_t*)p_this;
 106     demux_sys_t *p_sys;
 107
 108     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 109     if( !p_sys )
 110         return VLC_ENOMEM;
 111
 112     char *psz_fourcc = var_CreateGetString( p_demux, "rawaud-fourcc" );
 113     es_format_Init( &p_sys->fmt, AUDIO_ES,
 114                     vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc ) );
 115     free( psz_fourcc );
 116
 117     if( !p_sys->fmt.i_codec )
 118     {
 119         msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");
 120         es_format_Clean( &p_sys->fmt );
 121         free( p_sys );
 122         return VLC_EGENERIC;
 123     }
 124
 125     // get the bits per sample ratio based on codec
 126     switch( p_sys->fmt.i_codec )
 127     {
 128
 129         case VLC_CODEC_FL64:
 130             p_sys->fmt.audio.i_bitspersample = 64;
 131             break;
 132
 133         case VLC_CODEC_FL32:
 134         case VLC_CODEC_S32L:
 135         case VLC_CODEC_S32B:
 136             p_sys->fmt.audio.i_bitspersample = 32;
 137             break;
 138
 139         case VLC_CODEC_S24L:
 140         case VLC_CODEC_S24B:
 141             p_sys->fmt.audio.i_bitspersample = 24;
 142             break;
 143
 144         case VLC_CODEC_S16L:
 145         case VLC_CODEC_S16B:
 146             p_sys->fmt.audio.i_bitspersample = 16;
 147             break;
 148
 149         case VLC_CODEC_S8:
 150         case VLC_CODEC_U8:
 151             p_sys->fmt.audio.i_bitspersample = 8;
 152             break;
 153
 154         default:
 155             msg_Err( p_demux, "unknown fourcc format %4.4s",
 156                     (char *)&p_sys->fmt.i_codec);
 157             es_format_Clean( &p_sys->fmt );
 158             free( p_sys );
 159             return VLC_EGENERIC;
 160
 161     }
 162
 163
 164     p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );
 165     p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );
 166     p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );
 167
 168     if( p_sys->fmt.audio.i_rate == 0 || p_sys->fmt.audio.i_rate > 384000 )
 169     {
 170         msg_Err( p_demux, "invalid sample rate");
 171         es_format_Clean( &p_sys->fmt );
 172         free( p_sys );
 173         return VLC_EGENERIC;
 174     }
 175
 176     if( p_sys->fmt.audio.i_channels == 0 || p_sys->fmt.audio.i_channels > 32 )
 177     {
 178         msg_Err( p_demux, "invalid number of channels");
 179         es_format_Clean( &p_sys->fmt );
 180         free( p_sys );
 181         return VLC_EGENERIC;
 182     }
 183
 184     p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
 185                            p_sys->fmt.audio.i_channels *
 186                            p_sys->fmt.audio.i_bitspersample;
 187
 188     if( p_sys->fmt.i_bitrate > 50000000)
 189     {
 190         msg_Err( p_demux, "invalid bitrate");
 191         es_format_Clean( &p_sys->fmt );
 192         free( p_sys );
 193         return VLC_EGENERIC;
 194     }
 195
 196     msg_Dbg( p_demux,
 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);
 203
 204     /* add the es */
 205     p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 206     msg_Dbg( p_demux, "elementary stream added");
 207
 208     /* initialize timing */
 209     date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 210     date_Set( &p_sys->pts, VLC_TICK_0 );
 211
 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);
 218
 219     p_demux->pf_demux   = Demux;
 220     p_demux->pf_control = Control;
 221     return VLC_SUCCESS;
 222 }
 223
 224 /*****************************************************************************
 225  * Close: frees unused data
 226  *****************************************************************************/
 227 static void Close( vlc_object_t *p_this )
 228 {
 229     demux_t     *p_demux = (demux_t*)p_this;
 230     demux_sys_t *p_sys  = p_demux->p_sys;
 231
 232     es_format_Clean( &p_sys->fmt );
 233     free( p_sys );
 234 }
 235
 236 /*****************************************************************************
 237  * Demux: reads and demuxes data packets
 238  *****************************************************************************
 239  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 240  *****************************************************************************/
 241 static int Demux( demux_t *p_demux )
 242 {
 243     demux_sys_t *p_sys  = p_demux->p_sys;
 244     block_t     *p_block;
 245
 246     p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size );
 247     if( p_block == NULL )
 248         return VLC_DEMUXER_EOF;
 249
 250     p_block->i_dts = p_block->i_pts = date_Get( &p_sys->pts );
 251
 252     es_out_SetPCR( p_demux->out, p_block->i_pts );
 253     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 254
 255     date_Increment( &p_sys->pts, p_sys->i_frame_samples );
 256
 257     return VLC_DEMUXER_SUCCESS;
 258 }
 259
 260 /*****************************************************************************
 261  * Control:
 262  *****************************************************************************/
 263 static int Control( demux_t *p_demux, int i_query, va_list args )
 264 {
 265     demux_sys_t *p_sys  = p_demux->p_sys;
 266
 267     return demux_vaControlHelper( p_demux->s, 0, -1,
 268                                   p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );
 269 }