mpeg/psi: Add support for descriptor 0x0c (Multiplex buffer).

mpeg/psi/desc_0c.h

+/*****************************************************************************
+ * desc_0c.h: ISO/IEC 13818-1 Descriptor 0x0c (Multiplex buffer utilization)
+ *****************************************************************************
+ * 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_0C_H__
+#define __BITSTREAM_MPEG_DESC_0C_H__
+
+#include <bitstream/common.h>
+#include <bitstream/mpeg/psi/descriptors.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/*****************************************************************************
+ * Descriptor 0x0c: Multiplex buffer utilization descriptor
+ *****************************************************************************/
+#define DESC0C_HEADER_SIZE      (DESC_HEADER_SIZE + 4)
+
+static inline void desc0c_init(uint8_t *p_desc)
+{
+    desc_set_tag(p_desc, 0x0c);
+    desc_set_length(p_desc, DESC0C_HEADER_SIZE - DESC_HEADER_SIZE);
+}
+
+static inline bool desc0c_get_bound_valid(const uint8_t *p_desc)
+{
+    return ((p_desc[2] & 0x80) == 0x80);
+}
+
+static inline void desc0c_set_bound_valid(uint8_t *p_desc, bool bound_valid)
+{
+    p_desc[2] = bound_valid ? (p_desc[2] | 0x80) : (p_desc[2] &~ 0x80);
+}
+
+static inline uint16_t desc0c_get_LTW_offset_lower_bound(const uint8_t *p_desc)
+{
+    return ((p_desc[2] & 0x7f) << 8) | p_desc[3]; // 1xxxxxxx xxxxxxxx
+}
+
+static inline void desc0c_set_LTW_offset_lower_bound(uint8_t *p_desc, uint16_t LTW_offset_lower_bound)
+{
+    p_desc[2] = ((LTW_offset_lower_bound >> 8) & 0x7f) | (p_desc[2] & 0x80);
+    p_desc[3] = LTW_offset_lower_bound & 0xff;
+}
+
+static inline uint16_t desc0c_get_LTW_offset_upper_bound(const uint8_t *p_desc)
+{
+    return ((p_desc[4] & 0x7f) << 8) | p_desc[5]; // 1xxxxxxx xxxxxxxx
+}
+
+static inline void desc0c_set_LTW_offset_upper_bound(uint8_t *p_desc, uint16_t LTW_offset_upper_bound)
+{
+    p_desc[4] = ((LTW_offset_upper_bound >> 8) & 0x7f) | 0x80;
+    p_desc[5] = LTW_offset_upper_bound & 0xff;
+}
+
+static inline bool desc0c_validate(const uint8_t *p_desc)
+{
+    return desc_get_length(p_desc) >= DESC0C_HEADER_SIZE - DESC_HEADER_SIZE;
+}
+
+static inline void desc0c_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, "<MULTIPLEX_BUFFER_UTILIZATION_DESC bound_valid=\"%u\" LTW_offset_lower_bound=\"%u\" LTW_offset_upper_bound=\"%u\"/>",
+                 desc0c_get_bound_valid(p_desc),
+                 desc0c_get_LTW_offset_lower_bound(p_desc),
+                 desc0c_get_LTW_offset_upper_bound(p_desc));
+        break;
+    default:
+        pf_print(opaque, "    - desc 0c multiplex_buffer_utilization bound_valid=%u LTW_offset_lower_bound=%u LTW_offset_upper_bound=%u",
+                 desc0c_get_bound_valid(p_desc),
+                 desc0c_get_LTW_offset_lower_bound(p_desc),
+                 desc0c_get_LTW_offset_upper_bound(p_desc));
+    }
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

mpeg/psi/descs_list.h

@@ -44,5 +44,6 @@
 #include <bitstream/mpeg/psi/desc_09.h>
 #include <bitstream/mpeg/psi/desc_0a.h>
 #include <bitstream/mpeg/psi/desc_0b.h>
+#include <bitstream/mpeg/psi/desc_0c.h>
 
 #endif

mpeg/psi/descs_print.h

@@ -110,6 +110,7 @@ static inline void descl_print(uint8_t *p_descl, uint16_t i_length,
         CASE_DESC(09)
         CASE_DESC(0a)
         CASE_DESC(0b)
+        CASE_DESC(0c)
         CASE_DESC_ICONV(40)
         CASE_DESC(41)
         CASE_DESC(43)