modules/demux/tta.c

   1 /*****************************************************************************
   2  * tta.c : The Lossless True Audio parser
   3  *****************************************************************************
   4  * Copyright (C) 2006 VLC authors and VideoLAN
   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 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 #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 #include <limits.h>
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  Open  ( vlc_object_t * );
  42 static void Close ( vlc_object_t * );
  43
  44 vlc_module_begin ()
  45     set_shortname( "TTA" )
  46     set_description( N_("TTA demuxer") )
  47     set_category( CAT_INPUT )
  48     set_subcategory( SUBCAT_INPUT_DEMUX )
  49     set_capability( "demux", 145 )
  50
  51     set_callbacks( Open, Close )
  52     add_shortcut( "tta" )
  53 vlc_module_end ()
  54
  55 #define TTA_FRAMETIME 1.04489795918367346939
  56
  57 /*****************************************************************************
  58  * Local prototypes
  59  *****************************************************************************/
  60 static int Demux  ( demux_t * );
  61 static int Control( demux_t *, int, va_list );
  62
  63 struct demux_sys_t
  64 {
  65     /* */
  66     es_out_id_t *p_es;
  67
  68     /* */
  69     uint32_t i_totalframes;
  70     uint32_t i_currentframe;
  71     uint32_t *pi_seektable;
  72     uint32_t i_datalength;
  73     int      i_framelength;
  74
  75     /* */
  76     vlc_meta_t     *p_meta;
  77     int64_t        i_start;
  78 };
  79
  80 /*****************************************************************************
  81  * Open: initializes ES structures
  82  *****************************************************************************/
  83 static int Open( vlc_object_t * p_this )
  84 {
  85     demux_t     *p_demux = (demux_t*)p_this;
  86     demux_sys_t *p_sys;
  87     es_format_t fmt;
  88     const uint8_t *p_peek;
  89     uint8_t     p_header[22];
  90     uint8_t     *p_fullheader;
  91     int         i_seektable_size = 0;
  92     //char        psz_info[4096];
  93     //module_t    *p_id3;
  94
  95     if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
  96         return VLC_EGENERIC;
  97
  98     if( memcmp( p_peek, "TTA1", 4 ) )
  99     {
 100         if( !p_demux->obj.force )
 101             return VLC_EGENERIC;
 102
 103         /* User forced */
 104         msg_Err( p_demux, "this doesn't look like a true-audio stream, "
 105                  "continuing anyway" );
 106     }
 107
 108     if( vlc_stream_Read( p_demux->s, p_header, 22 ) < 22 )
 109         return VLC_EGENERIC;
 110
 111     /* Fill p_demux fields */
 112     p_demux->pf_demux = Demux;
 113     p_demux->pf_control = Control;
 114     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 115     if( !p_sys )
 116         return VLC_ENOMEM;
 117
 118     p_sys->pi_seektable = NULL;
 119
 120     /* Read the metadata */
 121     es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_TTA );
 122     fmt.audio.i_channels = GetWLE( &p_header[6] );
 123     fmt.audio.i_bitspersample = GetWLE( &p_header[8] );
 124     fmt.audio.i_rate = GetDWLE( &p_header[10] );
 125     if( fmt.audio.i_rate == 0 || /* Avoid divide by 0 */
 126         fmt.audio.i_rate > ( 1 << 20 ) /* Avoid i_framelength overflow */ )
 127     {
 128         msg_Warn( p_demux, "Wrong sample rate" );
 129         goto error;
 130     }
 131
 132     p_sys->i_datalength = GetDWLE( &p_header[14] );
 133     p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate;
 134
 135     p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength +
 136                           ((p_sys->i_datalength % p_sys->i_framelength) != 0);
 137     p_sys->i_currentframe = 0;
 138     if( (INT_MAX - 22 - 4) / sizeof(uint32_t) < p_sys->i_totalframes )
 139         goto error;
 140
 141     i_seektable_size = sizeof(uint32_t)*p_sys->i_totalframes;
 142
 143     /* Store the header and Seektable for avcodec */
 144     fmt.i_extra = 22 + i_seektable_size + 4;
 145     fmt.p_extra = p_fullheader = malloc( fmt.i_extra );
 146     if( !p_fullheader )
 147     {
 148         fmt.i_extra = 0;
 149         goto error;
 150     }
 151
 152     memcpy( p_fullheader, p_header, 22 );
 153     p_fullheader += 22;
 154     if( vlc_stream_Read( p_demux->s, p_fullheader, i_seektable_size )
 155              != i_seektable_size )
 156         goto error;
 157
 158     p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(uint32_t) );
 159     if( !p_sys->pi_seektable )
 160         goto error;
 161     for( uint32_t i = 0; i < p_sys->i_totalframes; i++ )
 162     {
 163         p_sys->pi_seektable[i] = GetDWLE( p_fullheader );
 164         p_fullheader += 4;
 165     }
 166
 167     if( 4 != vlc_stream_Read( p_demux->s, p_fullheader, 4 ) ) /* CRC */
 168         goto error;
 169     p_fullheader += 4;
 170
 171     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 172     p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra;
 173     es_format_Clean( &fmt );
 174
 175     return VLC_SUCCESS;
 176 error:
 177     es_format_Clean( &fmt );
 178     Close( p_this );
 179     return VLC_EGENERIC;
 180 }
 181
 182 /*****************************************************************************
 183  * Close: frees unused data
 184  *****************************************************************************/
 185 static void Close( vlc_object_t * p_this )
 186 {
 187     demux_t        *p_demux = (demux_t*)p_this;
 188     demux_sys_t    *p_sys = p_demux->p_sys;
 189
 190     free( p_sys->pi_seektable );
 191     free( p_sys );
 192 }
 193
 194 /*****************************************************************************
 195  * Demux:
 196  *****************************************************************************
 197  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 198  *****************************************************************************/
 199 static int Demux( demux_t *p_demux )
 200 {
 201     demux_sys_t *p_sys = p_demux->p_sys;
 202     block_t     *p_data;
 203
 204     if( p_sys->i_currentframe >= p_sys->i_totalframes )
 205         return 0;
 206
 207     p_data = vlc_stream_Block( p_demux->s,
 208                                p_sys->pi_seektable[p_sys->i_currentframe] );
 209     if( p_data == NULL ) return 0;
 210     p_data->i_dts = p_data->i_pts = VLC_TS_0 + (int64_t)(INT64_C(1000000) * p_sys->i_currentframe) * TTA_FRAMETIME;
 211
 212     p_sys->i_currentframe++;
 213
 214     es_out_SetPCR( p_demux->out, p_data->i_dts );
 215     if( p_sys->p_es )
 216         es_out_Send( p_demux->out, p_sys->p_es, p_data );
 217
 218     return 1;
 219 }
 220
 221 /*****************************************************************************
 222  * Control:
 223  *****************************************************************************/
 224 static int Control( demux_t *p_demux, int i_query, va_list args )
 225 {
 226     demux_sys_t *p_sys = p_demux->p_sys;
 227     double   f, *pf;
 228     int64_t i64, *pi64;
 229
 230     switch( i_query )
 231     {
 232         case DEMUX_CAN_SEEK:
 233             return vlc_stream_vaControl( p_demux->s, i_query, args );
 234
 235         case DEMUX_GET_POSITION:
 236             pf = va_arg( args, double * );
 237             i64 = stream_Size( p_demux->s ) - p_sys->i_start;
 238             if( i64 > 0 )
 239             {
 240                 *pf = (double)(vlc_stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64;
 241             }
 242             else
 243             {
 244                 *pf = 0.0;
 245             }
 246             return VLC_SUCCESS;
 247
 248         case DEMUX_SET_POSITION:
 249             f = va_arg( args, double );
 250             i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start));
 251             if( i64 > 0 )
 252             {
 253                 int64_t tmp = 0;
 254                 uint32_t i;
 255                 for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++)
 256                 {
 257                     tmp += p_sys->pi_seektable[i];
 258                 }
 259                 if( vlc_stream_Seek( p_demux->s, tmp+p_sys->i_start ) )
 260                     return VLC_EGENERIC;
 261                 p_sys->i_currentframe = i;
 262                 return VLC_SUCCESS;
 263             }
 264             return VLC_EGENERIC;
 265
 266         case DEMUX_GET_LENGTH:
 267             pi64 = va_arg( args, int64_t * );
 268             *pi64 = INT64_C(1000000) * p_sys->i_totalframes * TTA_FRAMETIME;
 269             return VLC_SUCCESS;
 270
 271         case DEMUX_GET_TIME:
 272             pi64 = va_arg( args, int64_t * );
 273             *pi64 = INT64_C(1000000) * p_sys->i_currentframe * TTA_FRAMETIME;
 274             return VLC_SUCCESS;
 275
 276         default:
 277             return VLC_EGENERIC;
 278     }
 279 }
 280