modules/demux/tta.c

   1 /*****************************************************************************
   2  * tta.c : The Lossless True Audio parser
   3  *****************************************************************************
   4  * Copyright (C) 2006 VLC authors and VideoLAN
   5  *
   6  * Authors: Derk-Jan Hartman <hartman at videolan dot org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU Lesser General Public License as published by
  10  * the Free Software Foundation; either version 2.1 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software Foundation,
  20  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <vlc_common.h>
  31 #include <vlc_plugin.h>
  32 #include <vlc_demux.h>
  33 #include <vlc_codec.h>
  34 #include <math.h>
  35 #include <limits.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 typedef struct
  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 } demux_sys_t;
  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( vlc_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->obj.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( vlc_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( (INT_MAX - 22 - 4) / sizeof(uint32_t) < p_sys->i_totalframes )
 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     {
 147         fmt.i_extra = 0;
 148         goto error;
 149     }
 150
 151     memcpy( p_fullheader, p_header, 22 );
 152     p_fullheader += 22;
 153     if( vlc_stream_Read( p_demux->s, p_fullheader, i_seektable_size )
 154              != i_seektable_size )
 155         goto error;
 156
 157     p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(uint32_t) );
 158     if( !p_sys->pi_seektable )
 159         goto error;
 160     for( uint32_t i = 0; i < p_sys->i_totalframes; i++ )
 161     {
 162         p_sys->pi_seektable[i] = GetDWLE( p_fullheader );
 163         p_fullheader += 4;
 164     }
 165
 166     if( 4 != vlc_stream_Read( p_demux->s, p_fullheader, 4 ) ) /* CRC */
 167         goto error;
 168     p_fullheader += 4;
 169
 170     p_sys->p_es = es_out_Add( p_demux->out, &fmt );
 171     p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra;
 172     es_format_Clean( &fmt );
 173
 174     return VLC_SUCCESS;
 175 error:
 176     es_format_Clean( &fmt );
 177     Close( p_this );
 178     return VLC_EGENERIC;
 179 }
 180
 181 /*****************************************************************************
 182  * Close: frees unused data
 183  *****************************************************************************/
 184 static void Close( vlc_object_t * p_this )
 185 {
 186     demux_t        *p_demux = (demux_t*)p_this;
 187     demux_sys_t    *p_sys = p_demux->p_sys;
 188
 189     free( p_sys->pi_seektable );
 190     free( p_sys );
 191 }
 192
 193 /*****************************************************************************
 194  * Demux:
 195  *****************************************************************************
 196  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 197  *****************************************************************************/
 198 static int Demux( demux_t *p_demux )
 199 {
 200     demux_sys_t *p_sys = p_demux->p_sys;
 201     block_t     *p_data;
 202
 203     if( p_sys->i_currentframe >= p_sys->i_totalframes )
 204         return VLC_DEMUXER_EOF;
 205
 206     p_data = vlc_stream_Block( p_demux->s,
 207                                p_sys->pi_seektable[p_sys->i_currentframe] );
 208     if( p_data == NULL )
 209         return VLC_DEMUXER_EOF;
 210     p_data->i_dts = p_data->i_pts = VLC_TICK_0 + vlc_tick_from_sec( 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 VLC_DEMUXER_SUCCESS;
 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;
 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             *va_arg( args, vlc_tick_t * ) =
 268                 vlc_tick_from_sec( p_sys->i_totalframes * TTA_FRAMETIME );
 269             return VLC_SUCCESS;
 270
 271         case DEMUX_GET_TIME:
 272             *va_arg( args, vlc_tick_t * ) = vlc_tick_from_sec( p_sys->i_currentframe * TTA_FRAMETIME );
 273             return VLC_SUCCESS;
 274
 275         case DEMUX_CAN_PAUSE:
 276         case DEMUX_SET_PAUSE_STATE:
 277         case DEMUX_CAN_CONTROL_PACE:
 278         case DEMUX_GET_PTS_DELAY:
 279             return demux_vaControlHelper( p_demux->s, 0, p_sys->i_datalength,
 280                                           0, p_sys->i_framelength, i_query, args );
 281
 282         default:
 283             return VLC_EGENERIC;
 284     }
 285 }
 286