/***************************************************************************** * dts.c : raw DTS stream input module for vlc ***************************************************************************** * Copyright (C) 2001-2007 the VideoLAN team * $Id$ * * Authors: Gildas Bazin * * 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 /***************************************************************************** * Module descriptor *****************************************************************************/ static int Open ( vlc_object_t * ); static void Close ( vlc_object_t * ); vlc_module_begin(); set_category( CAT_INPUT ); set_subcategory( SUBCAT_INPUT_DEMUX ); set_description( _("Raw DTS demuxer") ); set_capability( "demux", 155 ); set_callbacks( Open, Close ); add_shortcut( "dts" ); vlc_module_end(); /***************************************************************************** * Local prototypes *****************************************************************************/ static int Demux ( demux_t * ); static int Control( demux_t *, int, va_list ); struct demux_sys_t { bool b_start; es_out_id_t *p_es; /* Packetizer */ decoder_t *p_packetizer; int i_mux_rate; }; static int CheckSync( const uint8_t *p_peek ); #define DTS_PACKET_SIZE 16384 #define DTS_PROBE_SIZE (DTS_PACKET_SIZE * 4) #define DTS_MAX_HEADER_SIZE 11 /***************************************************************************** * 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; const byte_t *p_peek; int i_peek = 0; /* Check if we are dealing with a WAV file */ if( stream_Peek( p_demux->s, &p_peek, 20 ) == 20 && !memcmp( p_peek, "RIFF", 4 ) && !memcmp( &p_peek[8], "WAVE", 4 ) ) { int i_size; /* Find the wave format header */ i_peek = 20; while( memcmp( p_peek + i_peek - 8, "fmt ", 4 ) ) { i_size = GetDWLE( p_peek + i_peek - 4 ); if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC; i_peek += i_size + 8; if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek ) return VLC_EGENERIC; } /* Sanity check the wave format header */ i_size = GetDWLE( p_peek + i_peek - 4 ); if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC; i_peek += i_size + 8; if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek ) return VLC_EGENERIC; if( GetWLE( p_peek + i_peek - i_size - 8 /* wFormatTag */ ) != 1 /* WAVE_FORMAT_PCM */ ) return VLC_EGENERIC; if( GetWLE( p_peek + i_peek - i_size - 6 /* nChannels */ ) != 2 ) return VLC_EGENERIC; if( GetDWLE( p_peek + i_peek - i_size - 4 /* nSamplesPerSec */ ) != 44100 ) return VLC_EGENERIC; /* Skip the wave header */ while( memcmp( p_peek + i_peek - 8, "data", 4 ) ) { i_size = GetDWLE( p_peek + i_peek - 4 ); if( i_size + i_peek > DTS_PROBE_SIZE ) return VLC_EGENERIC; i_peek += i_size + 8; if( stream_Peek( p_demux->s, &p_peek, i_peek ) != i_peek ) return VLC_EGENERIC; } /* Some DTS wav files don't begin with a sync code so we do a more * extensive search */ i_size = stream_Peek( p_demux->s, &p_peek, DTS_PROBE_SIZE ); i_size -= DTS_MAX_HEADER_SIZE; while( i_peek < i_size ) { if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS ) /* The data is stored in 16 bits words */ i_peek += 2; else break; } } /* Have a peep at the show. */ CHECK_PEEK( p_peek, i_peek + DTS_MAX_HEADER_SIZE * 2 ); if( CheckSync( p_peek + i_peek ) != VLC_SUCCESS ) { if( !p_demux->b_force ) return VLC_EGENERIC; /* User forced */ msg_Err( p_demux, "this doesn't look like a DTS audio stream, " "continuing anyway" ); } DEMUX_INIT_COMMON(); p_sys = p_demux->p_sys; INIT_APACKETIZER( p_sys->p_packetizer, 'd','t','s',' ' ); LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "DTS" ); p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_in ); return VLC_SUCCESS; } /***************************************************************************** * 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; DESTROY_PACKETIZER( p_sys->p_packetizer ); free( p_sys ); } /***************************************************************************** * Demux: reads and demuxes data packets ***************************************************************************** * 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_block_in, *p_block_out; if( !( p_block_in = stream_Block( p_demux->s, DTS_PACKET_SIZE ) ) ) { return 0; } if( p_sys->b_start ) p_block_in->i_pts = p_block_in->i_dts = 1; else p_block_in->i_pts = p_block_in->i_dts = 0; while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) ) { p_sys->b_start = false; while( p_block_out ) { block_t *p_next = p_block_out->p_next; /* We assume a constant bitrate */ if( p_block_out->i_length ) { p_sys->i_mux_rate = p_block_out->i_buffer * I64C(1000000) / p_block_out->i_length; } /* set PCR */ es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts ); es_out_Send( p_demux->out, p_sys->p_es, p_block_out ); p_block_out = p_next; } } 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; if( i_query == DEMUX_SET_TIME ) return VLC_EGENERIC; else return demux_vaControlHelper( p_demux->s, 0, -1, 8*p_sys->i_mux_rate, 1, i_query, args ); } /***************************************************************************** * CheckSync: Check if buffer starts with a DTS sync code *****************************************************************************/ static int CheckSync( const uint8_t *p_peek ) { /* 14 bits, little endian version of the bitstream */ if( p_peek[0] == 0xff && p_peek[1] == 0x1f && p_peek[2] == 0x00 && p_peek[3] == 0xe8 && (p_peek[4] & 0xf0) == 0xf0 && p_peek[5] == 0x07 ) { return VLC_SUCCESS; } /* 14 bits, big endian version of the bitstream */ else if( p_peek[0] == 0x1f && p_peek[1] == 0xff && p_peek[2] == 0xe8 && p_peek[3] == 0x00 && p_peek[4] == 0x07 && (p_peek[5] & 0xf0) == 0xf0) { return VLC_SUCCESS; } /* 16 bits, big endian version of the bitstream */ else if( p_peek[0] == 0x7f && p_peek[1] == 0xfe && p_peek[2] == 0x80 && p_peek[3] == 0x01 ) { return VLC_SUCCESS; } /* 16 bits, little endian version of the bitstream */ else if( p_peek[0] == 0xfe && p_peek[1] == 0x7f && p_peek[2] == 0x01 && p_peek[3] == 0x80 ) { return VLC_SUCCESS; } return VLC_EGENERIC; }