modules/demux/au.c

   1 /*****************************************************************************
   2  * au.c : au file input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2007 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   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 <limits.h>
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_demux.h>
  36
  37 /* TODO:
  38  *  - all adpcm things (I _NEED_ samples)
  39  *  - ...
  40  */
  41
  42 /*****************************************************************************
  43  * Module descriptor
  44  *****************************************************************************/
  45 static int  Open ( vlc_object_t * );
  46
  47 vlc_module_begin ()
  48     set_category( CAT_INPUT )
  49     set_subcategory( SUBCAT_INPUT_DEMUX )
  50     set_description( N_("AU demuxer") )
  51     set_capability( "demux", 10 )
  52     set_callbacks( Open, NULL )
  53     add_shortcut( "au" )
  54 vlc_module_end ()
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 enum AuType_e
  60 {
  61     AU_UNKNOWN      =  0,
  62     AU_MULAW_8      =  1,  /* 8-bit ISDN u-law */
  63     AU_LINEAR_8     =  2,  /* 8-bit linear PCM */
  64     AU_LINEAR_16    =  3,  /* 16-bit linear PCM */
  65     AU_LINEAR_24    =  4,  /* 24-bit linear PCM */
  66     AU_LINEAR_32    =  5,  /* 32-bit linear PCM */
  67     AU_FLOAT        =  6,  /* 32-bit IEEE floating point */
  68     AU_DOUBLE       =  7,  /* 64-bit IEEE floating point */
  69     AU_ADPCM_G721   =  23, /* 4-bit CCITT g.721 ADPCM */
  70     AU_ADPCM_G722   =  24, /* CCITT g.722 ADPCM */
  71     AU_ADPCM_G723_3 =  25, /* CCITT g.723 3-bit ADPCM */
  72     AU_ADPCM_G723_5 =  26, /* CCITT g.723 5-bit ADPCM */
  73     AU_ALAW_8       =  27  /* 8-bit ISDN A-law */
  74 };
  75
  76 enum AuCat_e
  77 {
  78     AU_CAT_UNKNOWN  = 0,
  79     AU_CAT_PCM      = 1,
  80     AU_CAT_ADPCM    = 2
  81 };
  82
  83 typedef struct
  84 {
  85     es_format_t     fmt;
  86     es_out_id_t     *es;
  87
  88     vlc_tick_t      i_time;
  89
  90     int             i_frame_size;
  91     vlc_tick_t      i_frame_length;
  92
  93     uint32_t        i_header_size;
  94 } demux_sys_t;
  95
  96 static int Demux( demux_t * );
  97 static int Control ( demux_t *, int i_query, va_list args );
  98
  99 /*****************************************************************************
 100  * Open: check file and initializes structures
 101  *****************************************************************************/
 102 static int Open( vlc_object_t *p_this )
 103 {
 104     demux_t     *p_demux = (demux_t*)p_this;
 105
 106     uint8_t      hdr[20];
 107     const uint8_t *p_peek;
 108     int          i_cat;
 109
 110     if( vlc_stream_Peek( p_demux->s , &p_peek, 4 ) < 4 )
 111         return VLC_EGENERIC;
 112
 113     if( memcmp( p_peek, ".snd", 4 ) )
 114         return VLC_EGENERIC;
 115
 116     /* skip signature */
 117     if( vlc_stream_Read( p_demux->s, NULL, 4 ) < 4 )
 118         return VLC_EGENERIC;
 119
 120     /* read header */
 121     if( vlc_stream_Read( p_demux->s, hdr, 20 ) < 20 )
 122     {
 123         msg_Err( p_demux, "cannot read" );
 124         return VLC_EGENERIC;
 125     }
 126
 127     if( GetDWBE( &hdr[0]  ) < 24 )
 128     {
 129         msg_Err( p_demux, "invalid file" );
 130         return VLC_EGENERIC;
 131     }
 132
 133     demux_sys_t *p_sys = vlc_obj_malloc( p_this, sizeof (*p_sys) );
 134     if( unlikely(p_sys == NULL) )
 135         return VLC_ENOMEM;
 136
 137     p_sys->i_time = 0;
 138     p_sys->i_header_size = GetDWBE( &hdr[0] );
 139
 140     /* skip extra header data */
 141     if( p_sys->i_header_size > 24 )
 142     {
 143 #if (SSIZE_MAX <= INT32_MAX)
 144         if( p_sys->i_header_size > SSIZE_MAX )
 145             return VLC_EGENERIC;
 146 #endif
 147         size_t skip = p_sys->i_header_size - 24;
 148         if( vlc_stream_Read( p_demux->s, NULL, skip ) < (ssize_t)skip )
 149             return VLC_EGENERIC;
 150     }
 151
 152     /* init fmt */
 153     es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
 154     p_sys->fmt.audio.i_rate     = GetDWBE( &hdr[12] );
 155     p_sys->fmt.audio.i_channels = GetDWBE( &hdr[16] );
 156
 157 #if 0
 158     p_sys->au.i_header_size   = GetDWBE( &p_sys->au.i_header_size );
 159     p_sys->au.i_data_size     = GetDWBE( &p_sys->au.i_data_size );
 160     p_sys->au.i_encoding      = GetDWBE( &p_sys->au.i_encoding );
 161     p_sys->au.i_sample_rate   = GetDWBE( &p_sys->au.i_sample_rate );
 162     p_sys->au.i_channels      = GetDWBE( &p_sys->au.i_channels );
 163 #endif
 164     switch( GetDWBE( &hdr[8] ) )
 165     {
 166         case AU_ALAW_8:        /* 8-bit ISDN A-law */
 167             p_sys->fmt.i_codec               = VLC_CODEC_ALAW;
 168             p_sys->fmt.audio.i_bitspersample = 8;
 169             p_sys->fmt.audio.i_blockalign    = 1 * p_sys->fmt.audio.i_channels;
 170             i_cat                    = AU_CAT_PCM;
 171             break;
 172
 173         case AU_MULAW_8:       /* 8-bit ISDN u-law */
 174             p_sys->fmt.i_codec               = VLC_CODEC_MULAW;
 175             p_sys->fmt.audio.i_bitspersample = 8;
 176             p_sys->fmt.audio.i_blockalign    = 1 * p_sys->fmt.audio.i_channels;
 177             i_cat                    = AU_CAT_PCM;
 178             break;
 179
 180         case AU_LINEAR_8:      /* 8-bit linear PCM */
 181             p_sys->fmt.i_codec               = VLC_CODEC_S8;
 182             p_sys->fmt.audio.i_bitspersample = 8;
 183             p_sys->fmt.audio.i_blockalign    = 1 * p_sys->fmt.audio.i_channels;
 184             i_cat                    = AU_CAT_PCM;
 185             break;
 186
 187         case AU_LINEAR_16:     /* 16-bit linear PCM */
 188             p_sys->fmt.i_codec               = VLC_CODEC_S16B;
 189             p_sys->fmt.audio.i_bitspersample = 16;
 190             p_sys->fmt.audio.i_blockalign    = 2 * p_sys->fmt.audio.i_channels;
 191             i_cat                    = AU_CAT_PCM;
 192             break;
 193
 194         case AU_LINEAR_24:     /* 24-bit linear PCM */
 195             p_sys->fmt.i_codec               = VLC_CODEC_S24B;
 196             p_sys->fmt.audio.i_bitspersample = 24;
 197             p_sys->fmt.audio.i_blockalign    = 3 * p_sys->fmt.audio.i_channels;
 198             i_cat                    = AU_CAT_PCM;
 199             break;
 200
 201         case AU_LINEAR_32:     /* 32-bit linear PCM */
 202             p_sys->fmt.i_codec               = VLC_CODEC_S32B;
 203             p_sys->fmt.audio.i_bitspersample = 32;
 204             p_sys->fmt.audio.i_blockalign    = 4 * p_sys->fmt.audio.i_channels;
 205             i_cat                    = AU_CAT_PCM;
 206             break;
 207
 208         case AU_FLOAT:         /* 32-bit IEEE floating point */
 209             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_FLOAT );
 210             p_sys->fmt.audio.i_bitspersample = 32;
 211             p_sys->fmt.audio.i_blockalign    = 4 * p_sys->fmt.audio.i_channels;
 212             i_cat                    = AU_CAT_PCM;
 213             break;
 214
 215         case AU_DOUBLE:        /* 64-bit IEEE floating point */
 216             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_DOUBLE );
 217             p_sys->fmt.audio.i_bitspersample = 64;
 218             p_sys->fmt.audio.i_blockalign    = 8 * p_sys->fmt.audio.i_channels;
 219             i_cat                    = AU_CAT_PCM;
 220             break;
 221
 222         case AU_ADPCM_G721:    /* 4-bit CCITT g.721 ADPCM */
 223             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G721 );
 224             p_sys->fmt.audio.i_bitspersample = 0;
 225             p_sys->fmt.audio.i_blockalign    = 0 * p_sys->fmt.audio.i_channels;
 226             i_cat                    = AU_CAT_ADPCM;
 227             break;
 228
 229         case AU_ADPCM_G722:    /* CCITT g.722 ADPCM */
 230             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G722 );
 231             p_sys->fmt.audio.i_bitspersample = 0;
 232             p_sys->fmt.audio.i_blockalign    = 0 * p_sys->fmt.audio.i_channels;
 233             i_cat                    = AU_CAT_ADPCM;
 234             break;
 235
 236         case AU_ADPCM_G723_3:  /* CCITT g.723 3-bit ADPCM */
 237             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G723_3 );
 238             p_sys->fmt.audio.i_bitspersample = 0;
 239             p_sys->fmt.audio.i_blockalign    = 0 * p_sys->fmt.audio.i_channels;
 240             i_cat                    = AU_CAT_ADPCM;
 241             break;
 242
 243         case AU_ADPCM_G723_5:  /* CCITT g.723 5-bit ADPCM */
 244             p_sys->fmt.i_codec               = VLC_FOURCC( 'a', 'u', 0, AU_ADPCM_G723_5 );
 245             p_sys->fmt.audio.i_bitspersample = 0;
 246             p_sys->fmt.audio.i_blockalign    = 0 * p_sys->fmt.audio.i_channels;
 247             i_cat                    = AU_CAT_ADPCM;
 248             break;
 249
 250         default:
 251             msg_Warn( p_demux, "unknown encoding=0x%x", GetDWBE( &hdr[8] ) );
 252             p_sys->fmt.audio.i_bitspersample = 0;
 253             p_sys->fmt.audio.i_blockalign    = 0;
 254             i_cat                    = AU_CAT_UNKNOWN;
 255             break;
 256     }
 257
 258     p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *
 259                            p_sys->fmt.audio.i_channels *
 260                            p_sys->fmt.audio.i_bitspersample;
 261
 262     if( i_cat == AU_CAT_UNKNOWN || i_cat == AU_CAT_ADPCM )
 263     {
 264         msg_Err( p_demux, "unsupported codec/type (Please report it)" );
 265         return VLC_EGENERIC;
 266     }
 267
 268     if( p_sys->fmt.audio.i_rate == 0 )
 269     {
 270         msg_Err( p_demux, "invalid samplerate: 0" );
 271         return VLC_EGENERIC;
 272     }
 273
 274     /* add the es */
 275     p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
 276     if( unlikely(p_sys->es == NULL) )
 277         return VLC_ENOMEM;
 278
 279     /* calculate 50ms frame size/time */
 280     unsigned i_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );
 281     p_sys->i_frame_size = i_samples * p_sys->fmt.audio.i_channels *
 282                           ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );
 283     if( p_sys->fmt.audio.i_blockalign > 0 )
 284     {
 285         unsigned mod = p_sys->i_frame_size % p_sys->fmt.audio.i_blockalign;
 286         if( mod != 0 )
 287         {
 288             p_sys->i_frame_size += p_sys->fmt.audio.i_blockalign - mod;
 289         }
 290     }
 291     p_sys->i_frame_length = vlc_tick_from_samples( i_samples,
 292                                                    p_sys->fmt.audio.i_rate );
 293
 294     p_demux->p_sys = p_sys;
 295     p_demux->pf_demux = Demux;
 296     p_demux->pf_control = Control;
 297     return VLC_SUCCESS;
 298 }
 299
 300 /*****************************************************************************
 301  * Demux: read packet and send them to decoders
 302  *****************************************************************************
 303  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 304  *****************************************************************************/
 305 static int Demux( demux_t *p_demux )
 306 {
 307     demux_sys_t *p_sys = p_demux->p_sys;
 308     block_t     *p_block;
 309
 310     /* set PCR */
 311     es_out_SetPCR( p_demux->out, VLC_TICK_0 + p_sys->i_time );
 312
 313     p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size );
 314     if( p_block == NULL )
 315     {
 316         msg_Warn( p_demux, "cannot read data" );
 317         return VLC_DEMUXER_EOF;
 318     }
 319
 320     p_block->i_dts =
 321     p_block->i_pts = VLC_TICK_0 + p_sys->i_time;
 322     es_out_Send( p_demux->out, p_sys->es, p_block );
 323
 324     p_sys->i_time += p_sys->i_frame_length;
 325
 326     return VLC_DEMUXER_SUCCESS;
 327 }
 328
 329 /*****************************************************************************
 330  * Control:
 331  *****************************************************************************/
 332 static int Control( demux_t *p_demux, int i_query, va_list args )
 333 {
 334     demux_sys_t *p_sys = p_demux->p_sys;
 335
 336     return demux_vaControlHelper( p_demux->s, p_sys->i_header_size, -1,
 337                                    p_sys->fmt.i_bitrate, p_sys->fmt.audio.i_blockalign,
 338                                    i_query, args );
 339 }
 340