/* -*- 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 { //////////////////////////////////////////////////// // Types //////////////////////////////////////////////////// // 64 bits (8 bytes) typedef union { struct { unsigned long long int marker_bit3:1; unsigned long long int system_clock_reference3:15; unsigned long long int marker_bit2:1; unsigned long long int system_clock_reference2:15; unsigned long long int marker_bit1:1; unsigned long long int system_clock_reference1:3; unsigned long long int padding:4; unsigned long long int stuffing_byte:8; unsigned long long int packet_length:16; } bits; unsigned long long int ulli; } packet_header; typedef union { struct { unsigned long long int marker_bit5:1; unsigned long long int mux_rate:22; unsigned long long int marker_bit4:1; unsigned long long int marker_bit3:1; unsigned long long int system_clock_reference3:15; unsigned long long int marker_bit2:1; unsigned long long int system_clock_reference2:15; unsigned long long int marker_bit1:1; unsigned long long int system_clock_reference1:3; unsigned long long int padding:4; } bits; unsigned long long int ulli; } pack_header; typedef union { struct { unsigned long long int reserved_byte:8; unsigned long long int video_bound:5; unsigned long long int marker_bit3:1; unsigned long long int system_video_clock_flag:1; unsigned long long int system_audio_clock_flag:1; unsigned long long int CSPS_flag:1; unsigned long long int fixed_flag:1; unsigned long long int audio_bound:6; unsigned long long int marker_bit2:1; unsigned long long int rate_bound:22; unsigned long long int marker_bit1:1; unsigned long long int header_length:16; unsigned long long int ulli; } bits; unsigned long long int ulli; } system_header; typedef union { struct { unsigned long int STD_buffer_size_bound:13; unsigned long int STD_buffer_bound_scale:1; unsigned long int market_bits:2; unsigned long int stream_id:8; } bits; unsigned long int uli; } stream_description; //////////////////////////////////////////////////// // 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__*/