modules/demux/aiff.c

   1 /*****************************************************************************
   2  * aiff.c: Audio Interchange File Format demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2004 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 #include <stdlib.h>                                      /* malloc(), free() */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_demux.h>
  31
  32 /* TODO:
  33  *  - ...
  34  */
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open    ( vlc_object_t * );
  40 static void Close  ( vlc_object_t * );
  41
  42 vlc_module_begin();
  43     set_category( CAT_INPUT );
  44     set_subcategory( SUBCAT_INPUT_DEMUX );
  45     set_description( _("AIFF demuxer" ) );
  46     set_capability( "demux2", 10 );
  47     set_callbacks( Open, Close );
  48     add_shortcut( "aiff" );
  49 vlc_module_end();
  50
  51 /*****************************************************************************
  52  * Local prototypes
  53  *****************************************************************************/
  54
  55 struct demux_sys_t
  56 {
  57     es_format_t  fmt;
  58     es_out_id_t *es;
  59
  60     int64_t     i_ssnd_pos;
  61     int64_t     i_ssnd_size;
  62     int         i_ssnd_offset;
  63     int         i_ssnd_blocksize;
  64
  65     /* real data start */
  66     int64_t     i_ssnd_start;
  67     int64_t     i_ssnd_end;
  68
  69     int         i_ssnd_fsize;
  70
  71     int64_t     i_time;
  72 };
  73
  74 static int Demux  ( demux_t *p_demux );
  75 static int Control( demux_t *p_demux, int i_query, va_list args );
  76
  77 /* GetF80BE: read a 80 bits float in big endian */
  78 static unsigned int GetF80BE( uint8_t p[10] )
  79 {
  80     unsigned int i_mantissa = GetDWBE( &p[2] );
  81     int          i_exp = 30 - p[1];
  82     unsigned int i_last = 0;
  83
  84     while( i_exp-- )
  85     {
  86         i_last = i_mantissa;
  87         i_mantissa >>= 1;
  88     }
  89     if( i_last&0x01 )
  90     {
  91         i_mantissa++;
  92     }
  93     return i_mantissa;
  94 }
  95
  96 /*****************************************************************************
  97  * Open
  98  *****************************************************************************/
  99 static int Open( vlc_object_t *p_this )
 100 {
 101     demux_t     *p_demux = (demux_t*)p_this;
 102     demux_sys_t *p_sys;
 103
 104     uint8_t     *p_peek;
 105
 106     if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 ) return VLC_EGENERIC;
 107     if( strncmp( (char *)&p_peek[0], "FORM", 4 ) || strncmp( (char *)&p_peek[8], "AIFF", 4 ) )
 108     {
 109         return VLC_EGENERIC;
 110     }
 111
 112     /* skip aiff header */
 113     stream_Read( p_demux->s, NULL, 12 );
 114
 115     /* Fill p_demux field */
 116     STANDARD_DEMUX_INIT; p_sys = p_demux->p_sys;
 117     es_format_Init( &p_sys->fmt, UNKNOWN_ES, 0 );
 118     p_sys->i_time = 1;
 119     p_sys->i_ssnd_pos = -1;
 120
 121     for( ;; )
 122     {
 123         uint32_t i_size;
 124
 125         CHECK_PEEK_GOTO( p_peek, 8 );
 126         i_size = GetDWBE( &p_peek[4] );
 127
 128         msg_Dbg( p_demux, "chunk fcc=%4.4s size=%d", p_peek, i_size );
 129
 130         if( !strncmp( (char *)&p_peek[0], "COMM", 4 ) )
 131         {
 132             CHECK_PEEK_GOTO( p_peek, 18+8 );
 133             es_format_Init( &p_sys->fmt, AUDIO_ES, VLC_FOURCC( 't', 'w', 'o', 's' ) );
 134             p_sys->fmt.audio.i_channels = GetWBE( &p_peek[8] );
 135             p_sys->fmt.audio.i_bitspersample = GetWBE( &p_peek[14] );
 136             p_sys->fmt.audio.i_rate     = GetF80BE( &p_peek[16] );
 137
 138             msg_Dbg( p_demux, "COMM: channels=%d samples_frames=%d bits=%d rate=%d",
 139                      GetWBE( &p_peek[8] ), GetDWBE( &p_peek[10] ), GetWBE( &p_peek[14] ), GetF80BE( &p_peek[16] ) );
 140         }
 141         else if( !strncmp( (char *)&p_peek[0], "SSND", 4 ) )
 142         {
 143             CHECK_PEEK_GOTO( p_peek, 8+8 );
 144             p_sys->i_ssnd_pos = stream_Tell( p_demux->s );
 145             p_sys->i_ssnd_size = i_size;
 146             p_sys->i_ssnd_offset = GetDWBE( &p_peek[8] );
 147             p_sys->i_ssnd_blocksize = GetDWBE( &p_peek[12] );
 148
 149             msg_Dbg( p_demux, "SSND: (offset=%d blocksize=%d)",
 150                      p_sys->i_ssnd_offset, p_sys->i_ssnd_blocksize );
 151         }
 152         if( p_sys->i_ssnd_pos >= 12 && p_sys->fmt.i_cat == AUDIO_ES )
 153         {
 154             /* We have found the 2 needed chunks */
 155             break;
 156         }
 157
 158         /* Skip this chunk */
 159         i_size += 8;
 160         if( stream_Read( p_demux->s, NULL, i_size ) != (int)i_size )
 161         {
 162             msg_Warn( p_demux, "incomplete file" );
 163             goto error;
 164         }
 165     }
 166
 167     p_sys->i_ssnd_start = p_sys->i_ssnd_pos + 16 + p_sys->i_ssnd_offset;
 168     p_sys->i_ssnd_end   = p_sys->i_ssnd_start + p_sys->i_ssnd_size;
 169
 170     p_sys->i_ssnd_fsize = p_sys->fmt.audio.i_channels *
 171                           ( p_sys->fmt.audio.i_bitspersample + 7 ) / 8;
 172
 173     if( p_sys->i_ssnd_fsize <= 0 )
 174     {
 175         msg_Err( p_demux, "invalid audio parameters" );
 176         goto error;
 177     }
 178
 179     if( p_sys->i_ssnd_size <= 0 )
 180     {
 181         /* unknown */
 182         p_sys->i_ssnd_end = 0;
 183     }
 184
 185     /* seek into SSND chunk */
 186     if( stream_Seek( p_demux->s, p_sys->i_ssnd_start ) )
 187     {
 188         msg_Err( p_demux, "cannot seek to data chunk" );
 189         goto error;
 190     }
 191
 192     /* */
 193     p_sys->es = es_out_Add( p_demux->out, &p_sys->fmt );
 194
 195     return VLC_SUCCESS;
 196
 197 error:
 198     free( p_sys );
 199     return VLC_EGENERIC;
 200 }
 201
 202 /*****************************************************************************
 203  * Close
 204  *****************************************************************************/
 205 static void Close( vlc_object_t *p_this )
 206 {
 207     demux_t     *p_demux = (demux_t*)p_this;
 208     demux_sys_t *p_sys = p_demux->p_sys;
 209
 210     free( p_sys );
 211 }
 212
 213
 214 /*****************************************************************************
 215  * Demux:
 216  *****************************************************************************/
 217 static int Demux( demux_t *p_demux )
 218 {
 219     demux_sys_t *p_sys = p_demux->p_sys;
 220     int64_t     i_tell = stream_Tell( p_demux->s );
 221
 222     block_t     *p_block;
 223     int         i_read;
 224
 225     if( p_sys->i_ssnd_end > 0 && i_tell >= p_sys->i_ssnd_end )
 226     {
 227         /* EOF */
 228         return 0;
 229     }
 230
 231     /* Set PCR */
 232     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_time);
 233
 234     /* we will read 100ms at once */
 235     i_read = p_sys->i_ssnd_fsize * ( p_sys->fmt.audio.i_rate / 10 );
 236     if( p_sys->i_ssnd_end > 0 && p_sys->i_ssnd_end - i_tell < i_read )
 237     {
 238         i_read = p_sys->i_ssnd_end - i_tell;
 239     }
 240     if( ( p_block = stream_Block( p_demux->s, i_read ) ) == NULL )
 241     {
 242         return 0;
 243     }
 244
 245     p_block->i_dts =
 246     p_block->i_pts = p_sys->i_time;
 247
 248     p_sys->i_time += (int64_t)1000000 *
 249                      p_block->i_buffer /
 250                      p_sys->i_ssnd_fsize /
 251                      p_sys->fmt.audio.i_rate;
 252
 253     /* */
 254     es_out_Send( p_demux->out, p_sys->es, p_block );
 255     return 1;
 256 }
 257
 258 /*****************************************************************************
 259  * Control:
 260  *****************************************************************************/
 261 static int Control( demux_t *p_demux, int i_query, va_list args )
 262 {
 263     demux_sys_t *p_sys = p_demux->p_sys;
 264     double f, *pf;
 265     int64_t *pi64;
 266
 267     switch( i_query )
 268     {
 269         case DEMUX_GET_POSITION:
 270         {
 271             int64_t i_start = p_sys->i_ssnd_start;
 272             int64_t i_end   = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 273             int64_t i_tell  = stream_Tell( p_demux->s );
 274
 275             pf = (double*) va_arg( args, double* );
 276
 277             if( i_start < i_end )
 278             {
 279                 *pf = (double)(i_tell - i_start)/(double)(i_end - i_start);
 280                 return VLC_SUCCESS;
 281             }
 282             return VLC_EGENERIC;
 283         }
 284
 285         case DEMUX_SET_POSITION:
 286         {
 287             int64_t i_start = p_sys->i_ssnd_start;
 288             int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 289
 290             f = (double) va_arg( args, double );
 291
 292             if( i_start < i_end )
 293             {
 294                 int     i_frame = (f * ( i_end - i_start )) / p_sys->i_ssnd_fsize;
 295                 int64_t i_new   = i_start + i_frame * p_sys->i_ssnd_fsize;
 296
 297                 if( stream_Seek( p_demux->s, i_new ) )
 298                 {
 299                     return VLC_EGENERIC;
 300                 }
 301                 p_sys->i_time = 1 + (int64_t)1000000 * i_frame / p_sys->fmt.audio.i_rate;
 302                 return VLC_SUCCESS;
 303             }
 304             return VLC_EGENERIC;
 305         }
 306
 307         case DEMUX_GET_TIME:
 308             pi64 = (int64_t*)va_arg( args, int64_t * );
 309             *pi64 = p_sys->i_time;
 310             return VLC_SUCCESS;
 311
 312         case DEMUX_GET_LENGTH:
 313         {
 314             int64_t i_end  = p_sys->i_ssnd_end > 0 ? p_sys->i_ssnd_end : stream_Size( p_demux->s );
 315
 316             pi64 = (int64_t*)va_arg( args, int64_t * );
 317             if( p_sys->i_ssnd_start < i_end )
 318             {
 319                 *pi64 = (int64_t)1000000 * ( i_end - p_sys->i_ssnd_start ) / p_sys->i_ssnd_fsize / p_sys->fmt.audio.i_rate;
 320                 return VLC_SUCCESS;
 321             }
 322             return VLC_EGENERIC;
 323         }
 324         case DEMUX_SET_TIME:
 325         case DEMUX_GET_FPS:
 326         default:
 327             return VLC_EGENERIC;
 328     }
 329 }