/***************************************************************************** * tta.c : The Lossless True Audio parser ***************************************************************************** * Copyright (C) 2006 the VideoLAN team * $Id$ * * Authors: Derk-Jan Hartman * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); static void Close ( vlc_object_t * ); vlc_module_begin () set_shortname( "TTA" ) set_description( N_("TTA demuxer") ) set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_DEMUX ) set_capability( "demux", 145 ) set_callbacks( Open, Close ) add_shortcut( "tta" ) vlc_module_end () #define TTA_FRAMETIME 1.04489795918367346939 /***************************************************************************** * Local prototypes *****************************************************************************/ static int Demux ( demux_t * ); static int Control( demux_t *, int, va_list ); struct demux_sys_t { /* */ es_out_id_t *p_es; /* */ uint32_t i_totalframes; uint32_t i_currentframe; uint32_t *pi_seektable; uint32_t i_datalength; int i_framelength; /* */ vlc_meta_t *p_meta; int64_t i_start; }; /***************************************************************************** * Open: initializes ES structures *****************************************************************************/ static int Open( vlc_object_t * p_this ) { demux_t *p_demux = (demux_t*)p_this; demux_sys_t *p_sys; es_format_t fmt; const uint8_t *p_peek; uint8_t p_header[22]; uint8_t *p_fullheader; int i_seektable_size = 0; //char psz_info[4096]; //module_t *p_id3; if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC; if( memcmp( p_peek, "TTA1", 4 ) ) { if( !p_demux->b_force ) return VLC_EGENERIC; /* User forced */ msg_Err( p_demux, "this doesn't look like a true-audio stream, " "continuing anyway" ); } if( stream_Read( p_demux->s, p_header, 22 ) < 22 ) return VLC_EGENERIC; /* Fill p_demux fields */ p_demux->pf_demux = Demux; p_demux->pf_control = Control; p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) ); if( !p_sys ) return VLC_ENOMEM; p_sys->pi_seektable = NULL; /* Read the metadata */ es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_TTA ); fmt.audio.i_channels = GetWLE( &p_header[6] ); fmt.audio.i_bitspersample = GetWLE( &p_header[8] ); fmt.audio.i_rate = GetDWLE( &p_header[10] ); if( fmt.audio.i_rate == 0 || /* Avoid divide by 0 */ fmt.audio.i_rate > ( 1 << 20 ) /* Avoid i_framelength overflow */ ) { msg_Warn( p_demux, "Wrong sample rate" ); goto error; } p_sys->i_datalength = GetDWLE( &p_header[14] ); p_sys->i_framelength = TTA_FRAMETIME * fmt.audio.i_rate; p_sys->i_totalframes = p_sys->i_datalength / p_sys->i_framelength + ((p_sys->i_datalength % p_sys->i_framelength) != 0); p_sys->i_currentframe = 0; if( p_sys->i_totalframes > (1 << 29)) goto error; i_seektable_size = sizeof(uint32_t)*p_sys->i_totalframes; /* Store the header and Seektable for avcodec */ fmt.i_extra = 22 + i_seektable_size + 4; fmt.p_extra = p_fullheader = malloc( fmt.i_extra ); if( !p_fullheader ) goto error; memcpy( p_fullheader, p_header, 22 ); p_fullheader += 22; if( stream_Read( p_demux->s, p_fullheader, i_seektable_size ) != i_seektable_size ) goto error; p_sys->pi_seektable = calloc( p_sys->i_totalframes, sizeof(uint32_t) ); if( !p_sys->pi_seektable ) goto error; for( uint32_t i = 0; i < p_sys->i_totalframes; i++ ) { p_sys->pi_seektable[i] = GetDWLE( p_fullheader ); p_fullheader += 4; } stream_Read( p_demux->s, p_fullheader, 4 ); /* CRC */ p_fullheader += 4; p_sys->p_es = es_out_Add( p_demux->out, &fmt ); p_sys->i_start = p_fullheader - (uint8_t *)fmt.p_extra; return VLC_SUCCESS; error: es_format_Clean( &fmt ); Close( p_this ); return VLC_EGENERIC; } /***************************************************************************** * Close: frees unused data *****************************************************************************/ static void Close( vlc_object_t * p_this ) { demux_t *p_demux = (demux_t*)p_this; demux_sys_t *p_sys = p_demux->p_sys; free( p_sys->pi_seektable ); free( p_sys ); } /***************************************************************************** * Demux: ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/ static int Demux( demux_t *p_demux ) { demux_sys_t *p_sys = p_demux->p_sys; block_t *p_data; if( p_sys->i_currentframe > p_sys->i_totalframes ) return 0; p_data = stream_Block( p_demux->s, p_sys->pi_seektable[p_sys->i_currentframe] ); if( p_data == NULL ) return 0; p_data->i_dts = p_data->i_pts = VLC_TS_0 + (int64_t)(INT64_C(1000000) * p_sys->i_currentframe) * TTA_FRAMETIME; p_sys->i_currentframe++; es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_data->i_dts ); es_out_Send( p_demux->out, p_sys->p_es, p_data ); return 1; } /***************************************************************************** * Control: *****************************************************************************/ static int Control( demux_t *p_demux, int i_query, va_list args ) { demux_sys_t *p_sys = p_demux->p_sys; double f, *pf; int64_t i64, *pi64; switch( i_query ) { case DEMUX_GET_POSITION: pf = (double*) va_arg( args, double* ); i64 = stream_Size( p_demux->s ) - p_sys->i_start; if( i64 > 0 ) { *pf = (double)(stream_Tell( p_demux->s ) - p_sys->i_start )/ (double)i64; } else { *pf = 0.0; } return VLC_SUCCESS; case DEMUX_SET_POSITION: f = (double)va_arg( args, double ); i64 = (int64_t)(f * (stream_Size( p_demux->s ) - p_sys->i_start)); if( i64 > 0 ) { int64_t tmp = 0; uint32_t i; for( i=0; i < p_sys->i_totalframes && tmp+p_sys->pi_seektable[i] < i64; i++) { tmp += p_sys->pi_seektable[i]; } stream_Seek( p_demux->s, tmp+p_sys->i_start ); p_sys->i_currentframe = i; return VLC_SUCCESS; } return VLC_EGENERIC; case DEMUX_GET_LENGTH: pi64 = (int64_t*)va_arg( args, int64_t * ); *pi64 = INT64_C(1000000) * p_sys->i_totalframes * TTA_FRAMETIME; return VLC_SUCCESS; case DEMUX_GET_TIME: pi64 = (int64_t*)va_arg( args, int64_t * ); *pi64 = INT64_C(1000000) * p_sys->i_currentframe * TTA_FRAMETIME; return VLC_SUCCESS; default: return VLC_EGENERIC; } }