add bit parser

[rec10/rec10-git.git] / epgdump / bit.c

diff --git a/epgdump/bit.c b/epgdump/bit.c
new file mode 100644 (file)
index 0000000..0646624
--- /dev/null
+++ b/epgdump/bit.c
@@ -0,0 +1,133 @@
+// -*- tab-width:4 -*-
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "bit.h"
+
+// 2-STD-B10v4_6.pdf p89 (101/399)
+int parseBIThead(unsigned char *data, BIThead *head) {
+       int boff = 0;
+
+       memset(head, 0, sizeof(BIThead));
+
+       head->table_id = getBit(data, &boff, 8);
+       head->section_syntax_indicator = getBit(data, &boff, 1);
+       head->reserved_future_use1 = getBit(data, &boff, 1);
+       head->reserved1 = getBit(data, &boff, 2);
+       head->section_length = getBit(data, &boff, 12);
+       head->original_network_id = getBit(data, &boff, 16);
+       head->reserved2 = getBit(data, &boff, 2);
+       head->version_number = getBit(data, &boff, 5);
+       head->current_next_indicator = getBit(data, &boff, 1);
+       head->section_number = getBit(data, &boff, 8);
+       head->last_section_number = getBit(data, &boff, 8);
+       head->reserved_future_use2 = getBit(data, &boff, 3);
+       head->broadcast_view_propriety = getBit(data, &boff, 1);
+       head->first_descriptors_length = getBit(data, &boff, 12);
+       return 10 + head->first_descriptors_length;
+}
+
+// 4-TR-B14v4_3-2p3.pdf p4-254 (276/543)
+int parseBITloop(unsigned char *data, BITloop *loop) {
+       int boff = 0;
+
+       memset(loop, 0, sizeof(BITloop));
+
+       loop->broadcaster_id = getBit(data, &boff, 8);
+       loop->reserved_future_use = getBit(data, &boff, 4);
+       loop->broadcaster_descriptors_length = getBit(data, &boff, 12);
+
+       return 3;
+}
+
+// SI伝送パラメータ記述子
+int parseBITdesc(unsigned char *data, BITdesc *desc) {
+       int boff = 0;
+
+       memset(desc, 0, sizeof(BITdesc));
+
+       desc->descriptor_tag = getBit(data, &boff, 8);
+       desc->descriptor_length = getBit(data, &boff, 8);
+       desc->parameter_version = getBit(data, &boff, 8);
+       desc->update_time = getBit(data, &boff,16);
+
+       return 5;
+}
+
+int parseBITtable(unsigned char *data, BITtable *table) {
+       int boff = 0;
+
+       memset(table, 0, sizeof(BITtable));
+
+       table->table_id = getBit(data, &boff, 8);
+       table->table_description_length = getBit(data, &boff, 8);
+       table->table_cycle = getBit(data, &boff, 16);
+
+       return table->table_description_length + 2;
+}
+
+void dumpBIT(unsigned char *ptr)
+{
+       BIThead   bith;
+       BITloop   bitl;
+       BITdesc   bitd;
+       BITtable  bitt;
+
+       int len = 0;
+       int loop_len = 0;
+       int desc_len = 0;
+       int table_len = 0;
+
+       /* BIT */
+       len = parseBIThead(ptr, &bith);
+       ptr += len;
+       loop_len = bith.section_length - (len - 3 + 4); // 3は共通ヘッダ長 4はCRC
+
+       while(loop_len > 0) {
+               len = parseBITloop(ptr, &bitl);
+               ptr += len;
+               loop_len -= len;
+
+               desc_len = bitl.broadcaster_descriptors_length;
+               loop_len -= desc_len;
+
+               while(desc_len > 0) {
+                       len = parseBITdesc(ptr, &bitd);
+                       ptr += len;
+                       desc_len -= len;
+
+                       table_len = bitd.descriptor_length - 3;
+                       desc_len -= table_len;
+
+                       if ( bitd.descriptor_tag != 0xD7 ) {
+                               ptr += table_len;
+                               continue;
+                       }
+
+                       while(table_len > 0) {
+                               len = parseBITtable(ptr, &bitt);
+                               ptr += len;
+                               table_len -= len;
+
+                               /*
+                                       0x4E (M-EIT,L-EIT)
+                                       0x50(各局伝送パラメータ運用部分の H-EIT[schedule basic])
+                                       0x58 (各局伝送パラメータ運用部分の H-EIT[schedule extended])
+                                       0xC3(SDTT)
+                                       0xC8(CDT)
+                               */
+
+                               if (0) printf("BIT=(%d)%d:%d:%d:%d|0x%x:%d:%d=BCD(%d)\n",
+                                       bitl.broadcaster_id, bitd.descriptor_tag, bitd.descriptor_length, 
+                                       bitd.parameter_version, bitd.update_time, 
+                                       bitt.table_id, bitt.table_description_length, 
+                                       bitt.table_cycle, BCD(bitt.table_cycle));
+                       }
+               }
+       }
+
+       return;
+}
+