modules/demux/tta.c

   1 /*****************************************************************************
   2  * tta.c : The Lossless True Audio parser
   3  *****************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Derk-Jan Hartman <hartman at videolan dot org>
   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 #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 #include <vlc_codec.h>
  35 #include <math.h>
  36
  37 /*****************************************************************************
  38  * Module descriptor
  39  *****************************************************************************/
  40 static int  Open  ( vlc_object_t * );
  41 static void Close ( vlc_object_t * );
  42
  43 vlc_module_begin ()
  44     set_shortname( "TTA" )
  45     set_description( N_("TTA demuxer") )
  46     set_category( CAT_INPUT )
  47     set_subcategory( SUBCAT_INPUT_DEMUX )
  48     set_capability( "demux", 145 )
  49
  50     set_callbacks( Open, Close )
  51     add_shortcut( "tta" )
  52 vlc_module_end ()
  53
  54 #define TTA_FRAMETIME 1.04489795918367346939
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 static int Demux  ( demux_t * );
  60 static int Control( demux_t *, int, va_list );
  61
  62 struct demux_sys_t
  63 {
  64     /* */
  65     es_out_id_t *p_es;
  66
  67     /* */
  68     uint32_t i_totalframes;
  69     uint32_t i_currentframe;
  70     uint32_t *pi_seektable;
  71     uint32_t i_datalength;
  72     int      i_framelength;
  73
  74     /* */
  75     vlc_meta_t     *p_meta;
  76     int64_t        i_start;
  77 };
  78
  79 /*****************************************************************************
  80  * Open: initializes ES structures
  81  *****************************************************************************/
  82 static int Open( vlc_object_t * p_this )
  83 {
  84     demux_t     *p_demux = (demux_t*)p_this;
  85     demux_sys_t *p_sys;
  86     es_format_t fmt;
  87     const uint8_t *p_peek;
  88     uint8_t     p_header[22];
  89     uint8_t     *p_fullheader;
  90     int         i_seektable_size = 0;
  91     //char        psz_info[4096];
  92     //module_t    *p_id3;
  93
  94     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
  95         return VLC_EGENERIC;
  96
  97     if( memcmp( p_peek, "TTA1", 4 ) )
  98     {
  99         if( !p_demux->b_force )
 100             return VLC_EGENERIC;
 101
 102         /* User forced */
 103         msg_Err( p_demux, "this doesn't look like a true-audio stream, "
 104                  "continuing anyway" );
 105     }
 106
 107     if( stream_Read( p_demux->s, p_header, 22 ) < 22 )
 108         return VLC_EGENERIC;
 109
 110     /* Fill p_demux fields */
 111     p_demux->pf_demux = Demux;
 112     p_demux->pf_control = Control;
 113     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 114     if( !p_sys )
 115         return VLC_ENOMEM;
 116
 117     p_sys->pi_seektable = NULL;
 118
 119     /* Read the metadata */
 120     es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_TTA );
 121     fmt.audio.i_channels = GetWLE( &p_header[6] );
 122     fmt.audio.i_bitspersample = GetWLE( &p_header[8] );
 123     fmt.audio.i_rate = GetDWLE( &p_header[10] );
 124     if( fmt.audio.i_rate == 0 || /* Avoid divide by 0 */
 125         fmt.audio.i_rate > ( 1 << 20 ) /* Avoid i_framelength overflow */ )
 126     {
 127         msg_Warn( p_demux, "Wrong sample rate" );
 128         goto error;
 129     }
 130
 131     p_sys->i_datalength = GetDWLE( &p_header[14] );
 132     p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate;
 133
 134     p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength +
 135                           ((p_sys->i_datalength % p_sys->i_framelength) != 0);
 136     p_sys->i_currentframe = 0;
 137     if( p_sys->i_totalframes > (1 << 29))
 138         goto error;
 139
 140     i_seektable_size = sizeof(uint32_t)*p_sys->i_totalframes;
 141
 142     /* Store the header and Seektable for avcodec */
 143     fmt.i_extra = 22 + i_seektable_size + 4;
 144     fmt.p_extra = p_fullheader = malloc( fmt.i_extra );
 145     if( !p_fullheader )
 146         goto error;
 147
 148     memcpy( p_fullheader, p_header, 22 );
 149     p_fullheader += 22;
 150     if( stream_Read( p_demux->s, p_fullheader, i_seektable_size )
 151              != i_seektable_size )
 152         goto error;
 153
 154     p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(uint32_t) );
 155     if( !p_sys->pi_seektable )
 156         goto error;
 157     for( uint32_t i = 0; i < p_sys->i_totalframes; i++ )
 158     {
 159         p_sys->pi_seektable[i] = GetDWLE( p_fullheader );
 160         p_fullheader += 4;
 161     }
 162
 163     stream_Read( p_demux->s, p_fullheader, 4 ); /* CRC */
 164     p_fullheader += 4;
 165
 166     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 167     p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra;
 168
 169     return VLC_SUCCESS;
 170 error:
 171     es_format_Clean( &fmt );
 172     Close( p_this );
 173     return VLC_EGENERIC;
 174 }
 175
 176 /*****************************************************************************
 177  * Close: frees unused data
 178  *****************************************************************************/
 179 static void Close( vlc_object_t * p_this )
 180 {
 181     demux_t        *p_demux = (demux_t*)p_this;
 182     demux_sys_t    *p_sys = p_demux->p_sys;
 183
 184     free( p_sys->pi_seektable );
 185     free( p_sys );
 186 }
 187
 188 /*****************************************************************************
 189  * Demux:
 190  *****************************************************************************
 191  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 192  *****************************************************************************/
 193 static int Demux( demux_t *p_demux )
 194 {
 195     demux_sys_t *p_sys = p_demux->p_sys;
 196     block_t     *p_data;
 197
 198     if( p_sys->i_currentframe > p_sys->i_totalframes )
 199         return 0;
 200
 201     p_data = stream_Block( p_demux->s, p_sys->pi_seektable[p_sys->i_currentframe] );
 202     if( p_data == NULL ) return 0;
 203     p_data->i_dts = p_data->i_pts = VLC_TS_0 + (int64_t)(INT64_C(1000000) * p_sys->i_currentframe) * TTA_FRAMETIME;
 204
 205     p_sys->i_currentframe++;
 206
 207     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_data->i_dts );
 208     es_out_Send( p_demux->out, p_sys->p_es, p_data );
 209
 210     return 1;
 211 }
 212
 213 /*****************************************************************************
 214  * Control:
 215  *****************************************************************************/
 216 static int Control( demux_t *p_demux, int i_query, va_list args )
 217 {
 218     demux_sys_t *p_sys = p_demux->p_sys;
 219     double   f, *pf;
 220     int64_t i64, *pi64;
 221
 222     switch( i_query )
 223     {
 224         case DEMUX_GET_POSITION:
 225             pf = (double*) va_arg( args, double* );
 226             i64 = stream_Size( p_demux->s ) - p_sys->i_start;
 227             if( i64 > 0 )
 228             {
 229                 *pf = (double)(stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64;
 230             }
 231             else
 232             {
 233                 *pf = 0.0;
 234             }
 235             return VLC_SUCCESS;
 236
 237         case DEMUX_SET_POSITION:
 238             f = (double)va_arg( args, double );
 239             i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start));
 240             if( i64 > 0 )
 241             {
 242                 int64_t tmp = 0;
 243                 uint32_t i;
 244                 for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++)
 245                 {
 246                     tmp += p_sys->pi_seektable[i];
 247                 }
 248                 stream_Seek( p_demux->s, tmp+p_sys->i_start );
 249                 p_sys->i_currentframe = i;
 250                 return VLC_SUCCESS;
 251             }
 252             return VLC_EGENERIC;
 253
 254         case DEMUX_GET_LENGTH:
 255             pi64 = (int64_t*)va_arg( args, int64_t * );
 256             *pi64 = INT64_C(1000000) * p_sys->i_totalframes * TTA_FRAMETIME;
 257             return VLC_SUCCESS;
 258
 259         case DEMUX_GET_TIME:
 260             pi64 = (int64_t*)va_arg( args, int64_t * );
 261             *pi64 = INT64_C(1000000) * p_sys->i_currentframe * TTA_FRAMETIME;
 262             return VLC_SUCCESS;
 263
 264         default:
 265             return VLC_EGENERIC;
 266     }
 267 }
 268