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+/* -*- 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 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;
+ } packet_header;
+
+ typedef 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;
+ } pack_header;
+
+ typedef 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;
+ } system_header;
+
+ typedef 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;
+ } 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__*/