modules/demux/aiff.c

   1 /*****************************************************************************
   2  * aiff.c: Audio Interchange File Format demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 the VideoLAN team
   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
  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 /* TODO:
  37  *  - ...
  38  */
  39
  40 /*****************************************************************************
  41  * Module descriptor
  42  *****************************************************************************/
  43 static int  Open    ( vlc_object_t * );
  44 static void Close  ( vlc_object_t * );
  45
  46 vlc_module_begin ()
  47     set_category( CAT_INPUT )
  48     set_subcategory( SUBCAT_INPUT_DEMUX )
  49     set_description( N_("AIFF demuxer" ) )
  50     set_capability( "demux", 10 )
  51     set_callbacks( Open, Close )
  52     add_shortcut( "aiff" )
  53 vlc_module_end ()
  54
  55 /*****************************************************************************
  56  * Local prototypes
  57  *****************************************************************************/
  58
  59 struct demux_sys_t
  60 {
  61     es_format_t  fmt;
  62     es_out_id_t *es;
  63
  64     int64_t     i_ssnd_pos;
  65     int64_t     i_ssnd_size;
  66     int         i_ssnd_offset;
  67     int         i_ssnd_blocksize;
  68
  69     /* real data start */
  70     int64_t     i_ssnd_start;
  71     int64_t     i_ssnd_end;
  72
  73     int         i_ssnd_fsize;
  74
  75     int64_t     i_time;
  76 };
  77
  78 static int Demux  ( demux_t *p_demux );
  79 static int Control( demux_t *p_demux, int i_query, va_list args );
  80
  81 /* GetF80BE: read a 80 bits float in big endian */
  82 static unsigned int GetF80BE( const uint8_t p[10] )
  83 {
  84     unsigned int i_mantissa = GetDWBE( &p[2] );
  85     int          i_exp = 30 - p[1];
  86     unsigned int i_last = 0;
  87
  88     while( i_exp-- > 0 )
  89     {
  90         i_last = i_mantissa;
  91         i_mantissa >>= 1;
  92     }
  93     if( i_last&0x01 )
  94     {
  95         i_mantissa++;
  96     }
  97     return i_mantissa;
  98 }
  99
 100 /*****************************************************************************
 101  * Open
 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     const uint8_t *p_peek;
 109
 110     if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
 111         return VLC_EGENERIC;
 112     if( memcmp( p_peek, "FORM", 4 ) || memcmp( &p_peek[8], "AIFF", 4 ) )
 113         return VLC_EGENERIC;
 114
 115     /* skip aiff header */
 116     stream_Read( p_demux->s, NULL, 12 );
 117
 118     /* Fill p_demux field */
 119     DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys;
 120     es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
 121     p_sys->i_time = 0;
 122     p_sys->i_ssnd_pos = -1;
 123
 124     for( ;; )
 125     {
 126         uint32_t i_size;
 127
 128         if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
 129             goto error;
 130
 131         i_size = GetDWBE( &p_peek[4] );
 132
 133         msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
 134
 135         if( !memcmp( p_peek, "COMM", 4 ) )
 136         {
 137             if( stream_Peek( p_demux->s, &p_peek, 18+8 ) < 18+8 )
 138                 goto error;
 139
 140             es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
 141             p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
 142             p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
 143             p_sys->fmt.audio.i_rate     = GetF80BE( &p_peek[16] );
 144
 145             msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
 146                      GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
 147         }
 148         else if( !memcmp( p_peek, "SSND", 4 ) )
 149         {
 150             if( stream_Peek( p_demux->s, &p_peek, 8+8 ) < 8+8 )
 151                 goto error;
 152
 153             p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
 154             p_sys->i_ssnd_size = i_size;
 155             p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
 156             p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
 157
 158             msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
 159                      p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
 160         }
 161         if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
 162         {
 163             /* We have found the 2 needed chunks */
 164             break;
 165         }
 166
 167         /* Skip this chunk */
 168         i_size += 8;
 169         if( (i_size % 2) != 0 )
 170             i_size++;
 171         if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
 172         {
 173             msg_Warn( p_demux, "incomplete file" );
 174             goto error;
 175         }
 176     }
 177
 178     p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
 179     p_sys->i_ssnd_end   = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
 180
 181     p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
 182                           ((p_sys->fmt.audio.i_bitspersample + 7) / 8);
 183
 184     if( p_sys->i_ssnd_fsize <= 0 )
 185     {
 186         msg_Err( p_demux, "invalid audio parameters" );
 187         goto error;
 188     }
 189
 190     if( p_sys->i_ssnd_size <= 0 )
 191     {
 192         /* unknown */
 193         p_sys->i_ssnd_end = 0;
 194     }
 195
 196     /* seek into SSND chunk */
 197     if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
 198     {
 199         msg_Err( p_demux, "cannot seek to data chunk" );
 200         goto error;
 201     }
 202
 203     /* */
 204     p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
 205
 206     return VLC_SUCCESS;
 207
 208 error:
 209     free( p_sys );
 210     return VLC_EGENERIC;
 211 }
 212
 213 /*****************************************************************************
 214  * Close
 215  *****************************************************************************/
 216 static void Close( vlc_object_t *p_this )
 217 {
 218     demux_t     *p_demux = (demux_t*)p_this;
 219     demux_sys_t *p_sys = p_demux->p_sys;
 220
 221     free( p_sys );
 222 }
 223
 224
 225 /*****************************************************************************
 226  * Demux:
 227  *****************************************************************************/
 228 static int Demux( demux_t *p_demux )
 229 {
 230     demux_sys_t *p_sys = p_demux->p_sys;
 231     int64_t     i_tell = stream_Tell( p_demux->s );
 232
 233     block_t     *p_block;
 234     int         i_read;
 235
 236     if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
 237     {
 238         /* EOF */
 239         return 0;
 240     }
 241
 242     /* Set PCR */
 243     es_out_Control( p_demux->out, ES_OUT_SET_PCR, VLC_TS_0 + p_sys->i_time);
 244
 245     /* we will read 100ms at once */
 246     i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
 247     if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
 248     {
 249         i_read = p_sys->i_ssnd_end - i_tell;
 250     }
 251     if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
 252     {
 253         return 0;
 254     }
 255
 256     p_block->i_dts =
 257     p_block->i_pts = VLC_TS_0 + p_sys->i_time;
 258
 259     p_sys->i_time += (int64_t)1000000 *
 260                      p_block->i_buffer /
 261                      p_sys->i_ssnd_fsize /
 262                      p_sys->fmt.audio.i_rate;
 263
 264     /* */
 265     es_out_Send( p_demux->out, p_sys->es, p_block );
 266     return 1;
 267 }
 268
 269 /*****************************************************************************
 270  * Control:
 271  *****************************************************************************/
 272 static int Control( demux_t *p_demux, int i_query, va_list args )
 273 {
 274     demux_sys_t *p_sys = p_demux->p_sys;
 275     double f, *pf;
 276     int64_t *pi64;
 277
 278     switch( i_query )
 279     {
 280         case DEMUX_GET_POSITION:
 281         {
 282             int64_t i_start = p_sys->i_ssnd_start;
 283             int64_t i_end   = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 284             int64_t i_tell  = stream_Tell( p_demux->s );
 285
 286             pf = (double*) va_arg( args, double* );
 287
 288             if( i_start < i_end )
 289             {
 290                 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
 291                 return VLC_SUCCESS;
 292             }
 293             return VLC_EGENERIC;
 294         }
 295
 296         case DEMUX_SET_POSITION:
 297         {
 298             int64_t i_start = p_sys->i_ssnd_start;
 299             int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 300
 301             f = (double) va_arg( args, double );
 302
 303             if( i_start < i_end )
 304             {
 305                 int     i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
 306                 int64_t i_new   = i_start + i_frame * p_sys->i_ssnd_fsize;
 307
 308                 if( stream_Seek( p_demux->s, i_new ) )
 309                 {
 310                     return VLC_EGENERIC;
 311                 }
 312                 p_sys->i_time = (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
 313                 return VLC_SUCCESS;
 314             }
 315             return VLC_EGENERIC;
 316         }
 317
 318         case DEMUX_GET_TIME:
 319             pi64 = (int64_t*)va_arg( args, int64_t * );
 320             *pi64 = p_sys->i_time;
 321             return VLC_SUCCESS;
 322
 323         case DEMUX_GET_LENGTH:
 324         {
 325             int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 326
 327             pi64 = (int64_t*)va_arg( args, int64_t * );
 328             if( p_sys->i_ssnd_start < i_end )
 329             {
 330                 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;
 331                 return VLC_SUCCESS;
 332             }
 333             return VLC_EGENERIC;
 334         }
 335         case DEMUX_SET_TIME:
 336         case DEMUX_GET_FPS:
 337         default:
 338             return VLC_EGENERIC;
 339     }
 340 }