dvb/si: Add support for descriptor 0x7b (DTS descriptor).

README

@@ -141,6 +141,7 @@ Supported DVB descriptors
  * Descriptor 0x69: PDC descriptor
  * Descriptor 0x6a: AC-3 descriptor
  * Descriptor 0x7a: Enhanced AC-3 descriptor
+ * Descriptor 0x7b: DTS descriptor
 
 To see what is unsupported look in the TODO file.
 

TODO

@@ -28,8 +28,6 @@ so if you like something just do it and send a patch.
   - Descriptor 0x77: time_slice_fec_identifier_descriptor
   - Descriptor 0x78: ECM_repetition_rate_descriptor
   - Descriptor 0x79: S2_satellite_delivery_system_descriptor
-  - Descriptor 0x7a: enhanced_AC-3_descriptor
-  - Descriptor 0x7b: DTS descriptor
   - Descriptor 0x7c: AAC descriptor
   - Descriptor 0x7d: XAIT location descriptor
   - Descriptor 0x7e: FTA_content_management_descriptor

dvb/si/desc_7b.h

+/*****************************************************************************
+ * desc_7b.h: ETSI EN 300 468 Descriptor 0x7b: DTS 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 V1.12.1 (2011-06) (SI in DVB systems)
+ */
+
+#ifndef __BITSTREAM_DVB_DESC_7B_H__
+#define __BITSTREAM_DVB_DESC_7B_H__
+
+#include <bitstream/common.h>
+#include <bitstream/mpeg/psi/descriptors.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*****************************************************************************
+ * Descriptor 0x7b: DTS descriptor
+ *****************************************************************************/
+#define DESC7B_HEADER_SIZE      (DESC_HEADER_SIZE + 5)
+
+static inline void desc7b_init(uint8_t *p_desc)
+{
+    desc_set_tag(p_desc, 0x7b);
+    desc_set_length(p_desc, (DESC7B_HEADER_SIZE - DESC_HEADER_SIZE));
+}
+
+static inline uint8_t desc7b_get_sample_rate_code(const uint8_t *p_desc)
+{
+    return ((p_desc[2] & 0xf0) >> 4); // 1111xxxx
+}
+
+static inline void desc7b_set_sample_rate_code(uint8_t *p_desc, uint8_t i_sample_rate_code)
+{
+    p_desc[2] = (p_desc[2] & 0x0f) | (i_sample_rate_code << 4); // 1111xxxx
+}
+
+static inline uint8_t desc7b_get_bit_rate_code(const uint8_t *p_desc)
+{
+    return ((p_desc[2] & 0x0f) << 2) | ((p_desc[3] & 0xc0) >> 6); // xxxx1111 11xxxxxx
+}
+
+static inline void desc7b_set_bit_rate_code(uint8_t *p_desc, uint8_t i_bit_rate_code)
+{
+    p_desc[2] = (p_desc[2] & 0xf0) | ((i_bit_rate_code >> 2) & 0x0f); // xxxx1111
+    p_desc[3] = (i_bit_rate_code << 6) | (p_desc[2] & 0x3f); // 11xxxxxx
+}
+
+static inline uint8_t desc7b_get_nblks(const uint8_t *p_desc)
+{
+    return ((p_desc[3] & 0x3f) << 1) | ((p_desc[4] & 0x80) >> 7); // xx111111 1xxxxxxx
+}
+
+static inline void desc7b_set_nblks(uint8_t *p_desc, uint8_t i_nblks)
+{
+    p_desc[3] = (p_desc[3] & 0xc0) | ((i_nblks >> 1) & 0x3f); // xx111111
+    p_desc[4] = (i_nblks << 7) | (p_desc[4] & 0x7f); // 1xxxxxxx
+}
+
+static inline uint16_t desc7b_get_fsize(const uint8_t *p_desc)
+{
+    return ((p_desc[4] & 0x7f) << 7) | ((p_desc[5] & 0xfe) >> 1); // x1111111 1111111x
+}
+
+static inline void desc7b_set_fsize(uint8_t *p_desc, uint16_t i_fsize)
+{
+    i_fsize &= 0x3fff;
+    p_desc[4] = (p_desc[4] & 0x80) | (i_fsize >> 7); // x1111111
+    p_desc[5] = ((i_fsize & 0x7f) << 1) | (p_desc[5] & 0x01); // 1111111x
+}
+
+static inline uint8_t desc7b_get_surround_mode(const uint8_t *p_desc)
+{
+    return ((p_desc[5] & 0x01) << 5) | ((p_desc[6] & 0xf8) >> 3); // xxxxxxx1 11111xxx
+}
+
+static inline void desc7b_set_surround_mode(uint8_t *p_desc, uint8_t i_surround_mode)
+{
+    i_surround_mode &= 0x3f;
+    p_desc[5] = (p_desc[5] & 0xfe) | (i_surround_mode >> 5); // xxxxxxx1
+    p_desc[6] = ((i_surround_mode & 0x1f) << 3) | (p_desc[6] & 0x07); // 11111xxx
+}
+
+static inline bool desc7b_get_lfe_flag(const uint8_t *p_desc)
+{
+    return (p_desc[6] & 0x04) == 0x04; // xxxxx1xx
+}
+
+static inline void desc7b_set_lfe_flag(uint8_t *p_desc, bool b_lfe_flag)
+{
+    p_desc[6] = b_lfe_flag ? (p_desc[6] | 0x04) : (p_desc[6] &~ 0x04); // xxxxx1xx
+}
+
+static inline uint8_t desc7b_get_extended_surround_flag(const uint8_t *p_desc)
+{
+    return p_desc[6] & 0x03; // xxxxxx11
+}
+
+static inline void desc7b_set_extended_surround_flag(uint8_t *p_desc, uint8_t i_extended_surround_flag)
+{
+    p_desc[6] = (p_desc[6] & 0xfc) | (i_extended_surround_flag & 0x03); // xxxxxx11
+}
+
+static inline bool desc7b_validate(const uint8_t *p_desc)
+{
+    return desc_get_length(p_desc) >= (DESC7B_HEADER_SIZE - DESC_HEADER_SIZE);
+}
+
+static inline void desc7b_print(const uint8_t *p_desc, f_print pf_print,
+                                void *opaque, print_type_t i_print_type)
+{
+    switch (i_print_type) {
+    case PRINT_XML:
+        pf_print(opaque,
+                 "<DTS_DESC sample_rate_code=\"%u\" bit_rate_code=\"%u\""
+                 " nblks=\"%u\" fsize=\"%u\" surround_mode=\"%u\""
+                 " lfe_flag=\"%u\" extended_surround_flag=\"%u\"/>",
+                    desc7b_get_sample_rate_code(p_desc),
+                    desc7b_get_bit_rate_code(p_desc),
+                    desc7b_get_nblks(p_desc),
+                    desc7b_get_fsize(p_desc),
+                    desc7b_get_surround_mode(p_desc),
+                    desc7b_get_lfe_flag(p_desc),
+                    desc7b_get_extended_surround_flag(p_desc)
+                );
+        break;
+    default:
+        pf_print(opaque,
+                 "    - desc 7b dts sample_rate_code=%u bit_rate_code=%u"
+                 " nblks=%u fsize=%u surround_mode=%u"
+                 " lfe_flag=%u extended_surround_flag=%u",
+                    desc7b_get_sample_rate_code(p_desc),
+                    desc7b_get_bit_rate_code(p_desc),
+                    desc7b_get_nblks(p_desc),
+                    desc7b_get_fsize(p_desc),
+                    desc7b_get_surround_mode(p_desc),
+                    desc7b_get_lfe_flag(p_desc),
+                    desc7b_get_extended_surround_flag(p_desc)
+                );
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

dvb/si/descs_list.h

@@ -78,6 +78,7 @@
 #include <bitstream/dvb/si/desc_69.h>
 #include <bitstream/dvb/si/desc_6a.h>
 #include <bitstream/dvb/si/desc_7a.h>
+#include <bitstream/dvb/si/desc_7b.h>
 #include <bitstream/dvb/si/desc_83p28.h>
 #include <bitstream/dvb/si/desc_88p28.h>
 

examples/dvb_gen_si.c

@@ -1166,7 +1166,18 @@ static void build_desc7a(uint8_t *desc) {
     desc7a_set_length(desc);
 }
 
-/* ---  Descriptor 0x7b: DTS descriptor */
+/* DVB  Descriptor 0x7b: DTS descriptor */
+static void build_desc7b(uint8_t *desc) {
+    desc7b_init(desc);
+    desc7b_set_sample_rate_code(desc, 8);
+    desc7b_set_bit_rate_code(desc, 11);
+    desc7b_set_nblks(desc, 5);
+    desc7b_set_fsize(desc, 95);
+    desc7b_set_surround_mode(desc, 3);
+    desc7b_set_lfe_flag(desc, true);
+    desc7b_set_extended_surround_flag(desc, 2);
+}
+
 /* ---  Descriptor 0x7c: AAC descriptor */
 /* ---  Descriptor 0x7d: XAIT location descriptor */
 /* ---  Descriptor 0x7e: FTA_content_management_descriptor */
@@ -2197,6 +2208,9 @@ static void generate_pmt(void) {
             desc = descs_get_desc(desc_loop, desc_counter++);
             build_desc7a(desc);
 
+            desc = descs_get_desc(desc_loop, desc_counter++);
+            build_desc7b(desc);
+
             // Finish descriptor generation
             desc = descs_get_desc(desc_loop, desc_counter); // Get next descriptor pos
             descs_set_length(desc_loop, desc - desc_loop - DESCS_HEADER_SIZE);

examples/dvb_print_si.output.txt

@@ -215,6 +215,7 @@ new PMT program=20000 version=1 pcrpid=110
     - desc 5e multilingual_component code="bul" component_tag=46 text="Stereo"
     - desc 6a ac3 component_type_flag=1 component_type=10 bsid_flag=1 bsid=20 mainid_flag=1 mainid=30 asvc_flag=1 asvc=40
     - desc 7a ac3 component_type_flag=1 component_type=10 bsid_flag=1 bsid=20 mainid_flag=1 mainid=30 asvc_flag=1 asvc=40 mixinfoexists=1 substream1_flag=1 substream1=50 substream2_flag=1 substream2=60 substream3_flag=1 substream3=70
+    - desc 7b dts sample_rate_code=8 bit_rate_code=11 nblks=5 fsize=95 surround_mode=3 lfe_flag=1 extended_surround_flag=2
   * ES pid=122 streamtype=0x06 streamtype_txt="13818-1 PES private data"
     - desc 46 vbi_telx language=eng type=0x1 type_txt="Initial teletext page" mag=3 page=0x255x
     - desc 46 vbi_telx language=bul type=0x2 type_txt="Teletext subtitle page" mag=2 page=0x127x

examples/dvb_print_si.output.xml

@@ -384,6 +384,9 @@
 <DESC id="0x7a" length="8" value="ff0a141e28323c46">
 <AC3_DESC component_type_flag="1" component_type="10" bsid_flag="1" bsid="20" mainid_flag="1" mainid="30" asvc_flag="1" asvc="40" mixinfoexists="1" substream1_flag="1" substream1="50" substream2_flag="1" substream2="60" substream3_flag="1" substream3="70"/>
 </DESC>
+<DESC id="0x7b" length="5" value="82c280be1e">
+<DTS_DESC sample_rate_code="8" bit_rate_code="11" nblks="5" fsize="95" surround_mode="3" lfe_flag="1" extended_surround_flag="2"/>
+</DESC>
 </ES>
 <ES pid="122" streamtype="0x06" streamtype_txt="13818-1 PES private data">
 <DESC id="0x46" length="15" value="656e670bff62756c127f6672651940">

mpeg/psi/descs_print.h

@@ -172,6 +172,7 @@ static inline void descl_print(uint8_t *p_descl, uint16_t i_length,
         CASE_DESC(69)
         CASE_DESC(6a)
         CASE_DESC(7a)
+        CASE_DESC(7b)
 
 #undef CASE_DESC
 #undef CASE_DESC_ICONV