mpeg/psi: Add support for descriptor 0x0b (System clock).

mpeg/psi/desc_0b.h

+/*****************************************************************************
+ * desc_0b.h: ISO/IEC 13818-1 Descriptor 0x0b (System clock 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:
+ *  - ISO/IEC 13818-1:2007(E) (MPEG-2 Systems)
+ */
+
+#ifndef __BITSTREAM_MPEG_DESC_0B_H__
+#define __BITSTREAM_MPEG_DESC_0B_H__
+
+#include <bitstream/common.h>
+#include <bitstream/mpeg/psi/descriptors.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*****************************************************************************
+ * Descriptor 0x0b: System clock descriptor
+ *****************************************************************************/
+#define DESC0B_HEADER_SIZE      (DESC_HEADER_SIZE + 2)
+
+static inline void desc0b_init(uint8_t *p_desc)
+{
+    desc_set_tag(p_desc, 0x0b);
+    desc_set_length(p_desc, DESC0B_HEADER_SIZE - DESC_HEADER_SIZE);
+}
+
+static inline bool desc0b_get_external_clock_reference_indicator(const uint8_t *p_desc)
+{
+    return (p_desc[2] & 0x80) == 0x80;
+}
+
+static inline void desc0b_set_external_clock_reference_indicator(uint8_t *p_desc, bool b_external_clock_reference_indicator)
+{
+    p_desc[2] = (b_external_clock_reference_indicator ? (p_desc[2] | 0x80) : (p_desc[2] &~ 0x80)) | 0x40;
+}
+
+static inline uint8_t desc0b_get_clock_accuracy_integer(const uint8_t *p_desc)
+{
+    return p_desc[2] & 0x3f;
+}
+
+static inline void desc0b_set_clock_accuracy_integer(uint8_t *p_desc, uint8_t i_clock_accuracy_integer) {
+    p_desc[2] = (p_desc[2] & 0x80) | 0x40 | (i_clock_accuracy_integer & 0x3f);
+}
+
+static inline uint8_t desc0b_get_clock_accuracy_exponent(const uint8_t *p_desc)
+{
+    return p_desc[3] >> 5;
+}
+
+static inline void desc0b_set_clock_accuracy_exponent(uint8_t *p_desc, uint8_t i_clock_accuracy_exponent)
+{
+    p_desc[3] = (i_clock_accuracy_exponent << 5) | 0x1F;
+}
+
+static inline bool desc0b_validate(const uint8_t *p_desc)
+{
+    return desc_get_length(p_desc) >= DESC0B_HEADER_SIZE - DESC_HEADER_SIZE;
+}
+
+static inline void desc0b_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, "<SYSTEM_CLOCK_DESC external_clock_reference_indicator=\"%u\" clock_accuracy_integer=\"%u\" clock_accuracy_exponent=\"%u\"/>",
+            desc0b_get_external_clock_reference_indicator(p_desc),
+            desc0b_get_clock_accuracy_integer(p_desc),
+            desc0b_get_clock_accuracy_exponent(p_desc));
+        break;
+    default:
+        pf_print(opaque, "    - desc 0b system_clock external_clock_reference_indicator=%u clock_accuracy_integer=%u clock_accuracy_exponent=%u",
+            desc0b_get_external_clock_reference_indicator(p_desc),
+            desc0b_get_clock_accuracy_integer(p_desc),
+            desc0b_get_clock_accuracy_exponent(p_desc));
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

mpeg/psi/descs_list.h

@@ -43,5 +43,6 @@
 #include <bitstream/mpeg/psi/desc_08.h>
 #include <bitstream/mpeg/psi/desc_09.h>
 #include <bitstream/mpeg/psi/desc_0a.h>
+#include <bitstream/mpeg/psi/desc_0b.h>
 
 #endif

mpeg/psi/descs_print.h

@@ -109,6 +109,7 @@ static inline void descl_print(uint8_t *p_descl, uint16_t i_length,
         CASE_DESC(08)
         CASE_DESC(09)
         CASE_DESC(0a)
+        CASE_DESC(0b)
         CASE_DESC_ICONV(40)
         CASE_DESC(41)
         CASE_DESC(43)