dvb/si: Add support for descriptor 0x6d (Cell frequency link descriptor).

README

@@ -146,6 +146,7 @@ Supported DVB descriptors
  * Descriptor 0x6a: AC-3 descriptor
  * Descriptor 0x6b: Ancillary data descriptor
  * Descriptor 0x6c: Cell list descriptor
+ * Descriptor 0x6d: Cell frequency link descriptor
  * Descriptor 0x7a: Enhanced AC-3 descriptor
  * Descriptor 0x7b: DTS descriptor
  * Descriptor 0x7c: AAC descriptor

TODO

@@ -5,7 +5,6 @@ so if you like something just do it and send a patch.
   - Descriptor 0x29 IPMP_descriptor (defined in ISO/IEC 13818-11, MPEG-2 IPMP)
 
 - Add support (parser, generator, example) for these DVB descriptors:
-  - Descriptor 0x6d: cell_frequency_link_descriptor
   - Descriptor 0x6e: announcement_support_descriptor
   - Descriptor 0x6f: application_signalling_descriptor
   - Descriptor 0x70: adaptation_field_data_descriptor

dvb/si/desc_6d.h

+/*****************************************************************************
+ * desc_6d.h: ETSI EN 300 468 Descriptor 0x6d: Cell frequency link descriptor
+ *****************************************************************************
+ * Copyright (C) 2011 Unix Solutions Ltd.
+ *
+ * Authors: Georgi Chorbadzhiyski <georgi@unixsol.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject
+ * to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+/*
+ * Normative references:
+ *  - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
+ */
+
+#ifndef __BITSTREAM_DVB_DESC_6D_H__
+#define __BITSTREAM_DVB_DESC_6D_H__
+
+#include <bitstream/common.h>
+#include <bitstream/mpeg/psi/descriptors.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*****************************************************************************
+ * Descriptor 0x6d: Cell frequency link descriptor
+ *****************************************************************************/
+#define DESC6D_HEADER_SIZE      DESC_HEADER_SIZE
+#define DESC6D_DATA_SIZE        7
+#define DESC6D_SUBCELL_SIZE     5
+
+static inline void desc6d_init(uint8_t *p_desc)
+{
+    desc_set_tag(p_desc, 0x6d);
+}
+
+static inline uint16_t desc6dn_get_cell_id(const uint8_t *p_desc_n)
+{
+    return (p_desc_n[0] << 8) | p_desc_n[1];
+}
+
+static inline void desc6dn_set_cell_id(uint8_t *p_desc_n, uint16_t i_cell_id)
+{
+    p_desc_n[0] = (i_cell_id >> 8) & 0xff;
+    p_desc_n[1] =  i_cell_id       & 0xff;
+}
+
+static inline uint32_t desc6dn_get_frequency(const uint8_t *p_desc_n)
+{
+    return (p_desc_n[2] << 24) | (p_desc_n[3] << 16) | (p_desc_n[4] << 8) | p_desc_n[5];
+}
+
+static inline void desc6dn_set_frequency(uint8_t *p_desc_n, uint16_t i_frequency)
+{
+    p_desc_n[2] = (i_frequency >> 24) & 0xff;
+    p_desc_n[3] = (i_frequency >> 16) & 0xff;
+    p_desc_n[4] = (i_frequency >>  8) & 0xff;
+    p_desc_n[5] =  i_frequency        & 0xff;
+}
+
+static inline uint8_t desc6dn_get_subcell_info_loop_length(const uint8_t *p_desc_n)
+{
+    return p_desc_n[6];
+}
+
+
+static inline void desc6dn_set_subcell_info_loop_length(uint8_t *p_desc_n, uint8_t i_subcell_info_loop_length)
+{
+    p_desc_n[6] = i_subcell_info_loop_length;
+}
+
+
+/* Subcell loop */
+
+static inline uint8_t desc6dk_get_cell_id_extension(const uint8_t *p_desc_k)
+{
+    return p_desc_k[0];
+}
+
+static inline void desc6dk_set_cell_id_extension(uint8_t *p_desc_k, uint8_t i_cell_id_extension)
+{
+    p_desc_k[0] = i_cell_id_extension;
+}
+
+static inline uint32_t desc6dk_get_transponder_frequency(const uint8_t *p_desc_k)
+{
+    return (p_desc_k[1] << 24) | (p_desc_k[2] << 16) | (p_desc_k[3] << 8) | p_desc_k[4];
+}
+
+static inline void desc6dk_set_transponder_frequency(uint8_t *p_desc_k, uint32_t i_frequency)
+{
+    p_desc_k[1] = (i_frequency >> 24) & 0xff;
+    p_desc_k[2] = (i_frequency >> 16) & 0xff;
+    p_desc_k[3] = (i_frequency >>  8) & 0xff;
+    p_desc_k[4] =  i_frequency        & 0xff;
+}
+
+/* ----- */
+
+static inline uint8_t *desc6d_get_cell(uint8_t *p_desc, uint8_t n)
+{
+    uint8_t *p_desc_n = p_desc + DESC6D_HEADER_SIZE;
+    uint8_t i_desc_size = desc_get_length(p_desc);
+
+    while (n) {
+        uint8_t i_desc6d_data_size = DESC6D_DATA_SIZE + desc6dn_get_subcell_info_loop_length(p_desc_n);
+        if (p_desc_n + i_desc6d_data_size - p_desc > i_desc_size)
+            return NULL;
+        p_desc_n += i_desc6d_data_size;
+        n--;
+    }
+    if (p_desc_n - p_desc > i_desc_size)
+        return NULL;
+    return p_desc_n;
+}
+
+static inline uint8_t *desc6dn_get_subcell(uint8_t *p_desc_n, uint8_t k)
+{
+    int ofs = k * DESC6D_SUBCELL_SIZE;
+    if (ofs < desc6dn_get_subcell_info_loop_length(p_desc_n))
+        return p_desc_n + DESC6D_DATA_SIZE + ofs;
+    else
+        return NULL;
+}
+
+static inline bool desc6d_validate(const uint8_t *p_desc)
+{
+    const uint8_t *p_desc_n = p_desc + DESC6D_HEADER_SIZE;
+    int i_desc_size = desc_get_length(p_desc);
+    while (i_desc_size > (DESC6D_HEADER_SIZE - DESC_HEADER_SIZE)) {
+        uint8_t i_desc6d_data_size = DESC6D_DATA_SIZE + desc6dn_get_subcell_info_loop_length(p_desc_n);
+        i_desc_size -= i_desc6d_data_size;
+        p_desc_n    += i_desc6d_data_size;
+    }
+    return i_desc_size == (DESC6D_HEADER_SIZE - DESC_HEADER_SIZE);
+}
+
+static inline void desc6d_print(uint8_t *p_desc, f_print pf_print,
+                                void *opaque, print_type_t i_print_type)
+{
+    uint8_t n = 0;
+    uint8_t *p_desc_n;
+
+    while ((p_desc_n = desc6d_get_cell(p_desc, n++)) != NULL) {
+        uint8_t k = 0;
+        uint8_t *p_desc_k;
+        switch (i_print_type) {
+        case PRINT_XML:
+            pf_print(opaque,
+                "<CELL_FREQUENCY_LINK_DESC cell_id=\"%u\" frequency=\"%u\">",
+                desc6dn_get_cell_id(p_desc_n),
+                desc6dn_get_frequency(p_desc_n)
+            );
+            while ((p_desc_k = desc6dn_get_subcell(p_desc_n, k++)) != NULL) {
+                pf_print(opaque,
+                    "<SUBCELL_FREQUENCY_LINK_INFO cell_id_extension=\"%u\" transponder_frequency=\"%u\"/>",
+                    desc6dk_get_cell_id_extension(p_desc_k),
+                    desc6dk_get_transponder_frequency(p_desc_k)
+                );
+            }
+            pf_print(opaque, "</CELL_FREQUENCY_LINK_DESC>");
+            break;
+        default:
+            pf_print(opaque,
+                "    - desc 6d cell_frequency_link cell_id=%u frequency=%u",
+                desc6dn_get_cell_id(p_desc_n),
+                desc6dn_get_frequency(p_desc_n)
+            );
+            while ((p_desc_k = desc6dn_get_subcell(p_desc_n, k++)) != NULL) {
+                pf_print(opaque,
+                    "        - subcell_frequency_link cell_id_extension=%u"
+                    " transponder_frequency=%u",
+                    desc6dk_get_cell_id_extension(p_desc_k),
+                    desc6dk_get_transponder_frequency(p_desc_k)
+                );
+            }
+        }
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

dvb/si/descs_list.h

@@ -79,6 +79,7 @@
 #include <bitstream/dvb/si/desc_6a.h>
 #include <bitstream/dvb/si/desc_6b.h>
 #include <bitstream/dvb/si/desc_6c.h>
+#include <bitstream/dvb/si/desc_6d.h>
 #include <bitstream/dvb/si/desc_7a.h>
 #include <bitstream/dvb/si/desc_7b.h>
 #include <bitstream/dvb/si/desc_7c.h>

examples/dvb_gen_si.c

@@ -1542,7 +1542,63 @@ static void build_desc6c(uint8_t *desc) {
     desc_set_length(desc, cell_n - desc - DESC_HEADER_SIZE);
 }
 
-/* ---  Descriptor 0x6d: cell_frequency_link_descriptor */
+/* DVB  Descriptor 0x6d: Cell frequency link descriptor */
+static void build_desc6d(uint8_t *desc) {
+    uint8_t n = 0, k;
+    uint8_t *cell_n, *subcell_k;
+
+    desc6d_init(desc);
+    desc_set_length(desc, 255);
+
+    cell_n = desc6d_get_cell(desc, n++);
+    desc6dn_set_cell_id(cell_n, 1234);
+    desc6dn_set_frequency(cell_n, 4567);
+    desc6dn_set_subcell_info_loop_length(cell_n, 0);
+
+    cell_n = desc6d_get_cell(desc, n++);
+    desc6dn_set_cell_id(cell_n, 4456);
+    desc6dn_set_frequency(cell_n, 5567);
+    desc6dn_set_subcell_info_loop_length(cell_n, 0);
+    {
+        k = 0;
+        desc6dn_set_subcell_info_loop_length(cell_n, 255);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k++);
+        desc6dk_set_cell_id_extension(subcell_k, 0);
+        desc6dk_set_transponder_frequency(subcell_k, 1122);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k++);
+        desc6dk_set_cell_id_extension(subcell_k, 1);
+        desc6dk_set_transponder_frequency(subcell_k, 2233);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k++);
+        desc6dk_set_cell_id_extension(subcell_k, 2);
+        desc6dk_set_transponder_frequency(subcell_k, 3344);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k);
+        desc6dn_set_subcell_info_loop_length(cell_n, subcell_k - cell_n - DESC6D_DATA_SIZE);
+    }
+
+    cell_n = desc6d_get_cell(desc, n++);
+    desc6dn_set_cell_id(cell_n, 7890);
+    desc6dn_set_frequency(cell_n, 56789);
+    desc6dn_set_subcell_info_loop_length(cell_n, 0);
+    {
+        k = 0;
+        desc6dn_set_subcell_info_loop_length(cell_n, 255);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k++);
+        desc6dk_set_cell_id_extension(subcell_k, 0);
+        desc6dk_set_transponder_frequency(subcell_k, 889911);
+
+        subcell_k = desc6dn_get_subcell(cell_n, k);
+        desc6dn_set_subcell_info_loop_length(cell_n, subcell_k - cell_n - DESC6D_DATA_SIZE);
+    }
+
+    cell_n = desc6d_get_cell(desc, n);
+    desc_set_length(desc, cell_n - desc - DESC_HEADER_SIZE);
+}
+
 /* ---  Descriptor 0x6e: announcement_support_descriptor */
 /* ---  Descriptor 0x6f: application_signalling_descriptor */
 /* ---  Descriptor 0x70: adaptation_field_data_descriptor */
@@ -1857,6 +1913,9 @@ static void generate_nit(void) {
         desc = descs_get_desc(desc_loop, desc_counter++);
         build_desc6c(desc);
 
+        desc = descs_get_desc(desc_loop, desc_counter++);
+        build_desc6d(desc);
+
         // Finish descriptor generation
         desc = descs_get_desc(desc_loop, desc_counter); // Get next descriptor pos
         nit_set_desclength(nit, desc - desc_loop - DESCS_HEADER_SIZE);

examples/dvb_print_si.output.txt

@@ -47,6 +47,13 @@ new NIT actual networkid=40000 version=1
         - cell_list_subcell_info cell_id_extension=2 subcell_latitude=8755 subcell_longtitude=17493 subcell_extend_of_latitude=1656 subcell_extend_of_longtitude=2475
     - desc 6c cell_list cell_id=65535 cell_latitude=61166 cell_longtitude=56797 cell_extend_of_latitude=1929 cell_extend_of_longtitude=2748
         - cell_list_subcell_info cell_id_extension=0 subcell_latitude=4386 subcell_longtitude=13124 subcell_extend_of_latitude=1383 subcell_extend_of_longtitude=2202
+    - desc 6d cell_frequency_link cell_id=1234 frequency=4567
+    - desc 6d cell_frequency_link cell_id=4456 frequency=5567
+        - subcell_frequency_link cell_id_extension=0 transponder_frequency=1122
+        - subcell_frequency_link cell_id_extension=1 transponder_frequency=2233
+        - subcell_frequency_link cell_id_extension=2 transponder_frequency=3344
+    - desc 6d cell_frequency_link cell_id=7890 frequency=56789
+        - subcell_frequency_link cell_id_extension=0 transponder_frequency=889911
   * ts tsid=10000 onid=40000
     - desc 41 service_list sid=20000 type=0x01
     - desc 41 service_list sid=20100 type=0x02

examples/dvb_print_si.output.xml

@@ -78,6 +78,18 @@
 <CELL_LIST_SUBCELL_INFO cell_id_extension="0" subcell_latitude="4386" subcell_longtitude="13124" subcell_extend_of_latitude="1383" subcell_extend_of_longtitude="2202"/>
 </CELL_LIST_DESC>
 </DESC>
+<DESC id="0x6d" length="41" value="04d2000011d7001168000015bf0f000000046201000008b90200000d101ed20000ddd50500000d9437">
+<CELL_FREQUENCY_LINK_DESC cell_id="1234" frequency="4567">
+</CELL_FREQUENCY_LINK_DESC>
+<CELL_FREQUENCY_LINK_DESC cell_id="4456" frequency="5567">
+<SUBCELL_FREQUENCY_LINK_INFO cell_id_extension="0" transponder_frequency="1122"/>
+<SUBCELL_FREQUENCY_LINK_INFO cell_id_extension="1" transponder_frequency="2233"/>
+<SUBCELL_FREQUENCY_LINK_INFO cell_id_extension="2" transponder_frequency="3344"/>
+</CELL_FREQUENCY_LINK_DESC>
+<CELL_FREQUENCY_LINK_DESC cell_id="7890" frequency="56789">
+<SUBCELL_FREQUENCY_LINK_INFO cell_id_extension="0" transponder_frequency="889911"/>
+</CELL_FREQUENCY_LINK_DESC>
+</DESC>
 <TS tsid="10000" onid="40000">
 <DESC id="0x41" length="12" value="4e20014e84024ee8014f4c02">
 <SERVICE_LIST_DESC sid="20000" type="0x01" />

mpeg/psi/descs_print.h

@@ -178,6 +178,7 @@ static inline void descl_print(uint8_t *p_descl, uint16_t i_length,
         CASE_DESC(6a)
         CASE_DESC(6b)
         CASE_DESC(6c)
+        CASE_DESC(6d)
         CASE_DESC(7a)
         CASE_DESC(7b)
         CASE_DESC(7c)