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Diffstat (limited to 'src/iso11172-1.h')
| -rw-r--r-- | src/iso11172-1.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/iso11172-1.h b/src/iso11172-1.h new file mode 100644 index 0000000..f284410 --- /dev/null +++ b/src/iso11172-1.h @@ -0,0 +1,110 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * iso11172-1.h + * + * Wed Aug 31 13:48:30 CEST 2005 + * Copyright 2005 Bent Bisballe Nyeng + * deva@aasimon.org + ****************************************************************************/ + +/* + * This file is part of MIaV. + * + * MIaV 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. + * + * MIaV 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 MIaV; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +/* + * This file contains symbols used to create an ISO11172-1 compatible multiplexed + * MPEG stream. + */ + +#include "config.h" +#ifndef __MIAV_ISO11172_1_H__ +#define __MIAV_ISO11172_1_H__ + +#define CLOCK_90KHZ 90000 + +namespace ISO11172_1 { + //////////////////////////////////////////////////// + // Constants + //////////////////////////////////////////////////// + const char pack_start_code[] = "\x00\x00\x01\xBA"; + const char system_header_start_code[] = "\x00\x00\x01\xBB"; + const char packet_start_code_prefix[] = "\x00\x00\x01"; + const char stream_id_video1[] = "\xE3"; + const char stream_id_video2[] = "\xE4"; + const char stream_id_video3[] = "\xE5"; + const char stream_id_video4[] = "\xE6"; + const char stream_id_video5[] = "\xE7"; + const char stream_id_video6[] = "\xE8"; + const char stream_id_video7[] = "\xE9"; + const char stream_id_video8[] = "\xEA"; + const char stream_id_audio1[] = "\xC0"; + const char stream_id_audio2[] = "\xC1"; + const char stream_id_audio3[] = "\xC2"; + const char stream_id_audio4[] = "\xC3"; + const char stream_id_audio5[] = "\xC4"; + const char stream_id_audio6[] = "\xC5"; + const char stream_id_audio7[] = "\xC6"; + const char stream_id_audio8[] = "\xC7"; + const char stream_id_padding[] = "\xBE"; + const char end_code[] = "\x00\x00\x01\xB9"; + + //////////////////////////////////////////////////// + // Methods + //////////////////////////////////////////////////// + /** + * SCR stands for System Clock Reference + */ + inline unsigned int SCR(unsigned int previous_SCR, + unsigned int pack_header_size, + unsigned int packets_per_pack, + unsigned int packet_data_size, + unsigned int Rmux) + { + // To prevent a crash when doing division. + if(Rmux == 0) Rmux = 1; + return previous_SCR + (unsigned int)((double)(pack_header_size + + (packets_per_pack * packet_data_size)) * + (double)CLOCK_90KHZ / (double)Rmux); + } + + /** + * Calculates Rmux according to subclause A.5.4 + * mux stands for multiplexing and R for Rate, + * so Rmux is the rate of the multiplexing. + */ + inline unsigned int Rmux(unsigned int video_data_rate, + unsigned int audio_data_rate, + unsigned int packet_header_size, + unsigned int pack_header_size, + unsigned int packets_per_pack, + unsigned int packet_data_size) + { + // To prevent a crash when doing division. + if(packets_per_pack == 0) packets_per_pack = 1; + if(packet_data_size == 0) packet_data_size = 1; + + return (unsigned int)( + ((double)video_data_rate + (double)audio_data_rate) * + (1.0 + ((double)packet_header_size + (double)pack_header_size / (double)packets_per_pack) + / (double)packet_data_size) + ); + } + + +}; + +#endif/*__MIAV_ISO11172_1_H__*/ |