[PATCH] Add 0x4B Descriptor Decoder/Generator support

From 1dc6d085f8570664084fd0dc87b73d47591be8e4 Mon Sep 17 00:00:00 2001
From: Roberto Corno <[email protected]>
Date: Thu, 30 Aug 2012 11:31:34 +0200
Subject: [PATCH 1/2] Add 0x4B Descriptor Decoder/Generator support

---
 src/Makefile.am         |    2 +
 src/descriptors/dr.h    |    1 +
 src/descriptors/dr_4b.c |  117 ++++++++++++++++++++++++++++++++++++++++++++
 src/descriptors/dr_4b.h |  123 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 243 insertions(+), 0 deletions(-)
 create mode 100644 src/descriptors/dr_4b.c
 create mode 100644 src/descriptors/dr_4b.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 9ba6e27..f9a5c4f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -46,6 +46,7 @@ pkginclude_HEADERS = dvbpsi.h psi.h descriptor.h demux.h \
                      descriptors/dr_48.h \
                      descriptors/dr_49.h \
                      descriptors/dr_4a.h \
+                     descriptors/dr_4b.h \
                      descriptors/dr_4d.h \
                      descriptors/dr_4e.h \
                      descriptors/dr_52.h \
@@ -90,6 +91,7 @@ descriptors_src = descriptors/dr_02.c \
                   descriptors/dr_48.c \
                   descriptors/dr_49.c \
                   descriptors/dr_4a.c \
+                  descriptors/dr_4b.c \
                   descriptors/dr_4d.c \
                   descriptors/dr_4e.c \
                   descriptors/dr_52.c \
diff --git a/src/descriptors/dr.h b/src/descriptors/dr.h
index 6f2fd34..8a27329 100644
--- a/src/descriptors/dr.h
+++ b/src/descriptors/dr.h
@@ -58,6 +58,7 @@
 #include "dr_48.h"
 #include "dr_49.h"
 #include "dr_4a.h"
+#include "dr_4b.h"
 #include "dr_4d.h"
 #include "dr_4e.h"
 #include "dr_52.h"
diff --git a/src/descriptors/dr_4b.c b/src/descriptors/dr_4b.c
new file mode 100644
index 0000000..aba5a6b
--- /dev/null
+++ b/src/descriptors/dr_4b.c
@@ -0,0 +1,117 @@
+/*
+ * dr_4b.c
+ * Copyright (C) 2012 VideoLAN
+ *
+ * Authors: Roberto Corno <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#if defined(HAVE_INTTYPES_H)
+#include <inttypes.h>
+#elif defined(HAVE_STDINT_H)
+#include <stdint.h>
+#endif
+
+#include "../dvbpsi.h"
+#include "../dvbpsi_private.h"
+#include "../descriptor.h"
+
+#include "dr_4b.h"
+
+/*****************************************************************************
+ * dvbpsi_DecodeNVODReferenceDr
+ *****************************************************************************/
+dvbpsi_nvod_ref_dr_t* dvbpsi_DecodeNVODReferenceDr(dvbpsi_descriptor_t * p_descriptor)
+{
+    /* Check the tag */
+    if (p_descriptor->i_tag != 0x4B)
+        return NULL;
+
+    /* Don't decode twice */
+    if (p_descriptor->p_decoded)
+        return p_descriptor->p_decoded;
+
+    /* Check the length */
+    if (p_descriptor->i_length < 6)
+        return NULL;
+    if (p_descriptor->i_length % 6!=0)
+        return NULL;
+
+    /* Allocate memory */
+    dvbpsi_nvod_ref_dr_t * p_decoded;
+    p_decoded = (dvbpsi_nvod_ref_dr_t*)calloc(1, sizeof(dvbpsi_nvod_ref_dr_t));
+    if (!p_decoded)
+        return NULL;
+
+    /* Decode data */
+    p_decoded->i_references = p_descriptor->i_length % 6;
+
+    for (int i = 0; i < p_decoded->i_references; i++) {
+      int pos = i*6;
+      p_decoded->p_nvod_refs[i].i_transport_stream_id = p_descriptor->p_data[pos] << 8
+                                                      | p_descriptor->p_data[pos+1];
+      p_decoded->p_nvod_refs[i].i_original_network_id = p_descriptor->p_data[pos+2] << 8
+                                                      | p_descriptor->p_data[pos+3];
+      p_decoded->p_nvod_refs[i].i_service_id = p_descriptor->p_data[pos+4] << 8
+                                                      | p_descriptor->p_data[pos+5];
+    }
+
+    p_descriptor->p_decoded = (void*)p_decoded;
+
+    return p_decoded;
+}
+
+/*****************************************************************************
+ * dvbpsi_GenNVODReferenceDr
+ *****************************************************************************/
+dvbpsi_descriptor_t * dvbpsi_GenNVODReferenceDr(dvbpsi_nvod_ref_dr_t * p_decoded,
+                                          bool b_duplicate)
+{
+    /* Create the descriptor */
+    dvbpsi_descriptor_t * p_descriptor =
+            dvbpsi_NewDescriptor(0x4b, p_decoded->i_references * 6, NULL);
+    if (!p_descriptor)
+        return NULL;
+
+    /* Encode data */
+    int pos = 0;
+    for (int i = 0; i < p_decoded->i_references; i++ ) {
+    	p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_transport_stream_id >> 8;
+        p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_transport_stream_id;
+        p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_original_network_id >> 8;
+        p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_original_network_id;
+        p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_service_id >> 8;
+        p_descriptor->p_data[pos++] = p_decoded->p_nvod_refs[i].i_service_id;
+    }
+
+    if (b_duplicate)
+    {
+        /* Duplicate decoded data */
+        p_descriptor->p_decoded =
+               dvbpsi_DuplicateDecodedDescriptor(p_decoded,
+                      sizeof(dvbpsi_nvod_ref_dr_t));
+    }
+
+    return p_descriptor;
+}
diff --git a/src/descriptors/dr_4b.h b/src/descriptors/dr_4b.h
new file mode 100644
index 0000000..455f381
--- /dev/null
+++ b/src/descriptors/dr_4b.h
@@ -0,0 +1,123 @@
+/*****************************************************************************
+ * dr_4a.h
+ * Copyright (C) 2012 VideoLAN
+ *
+ * Authors: Roberto Corno <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+/*!
+ * \file <dr_4b.h>
+ * \author Corno Roberto <[email protected]>
+ * \brief Application interface for the Near Video On Demand (NVOD) reference
+ * descriptor decoder and generator.
+ *
+ * Application interface for the DVB Near Video On Demand (NVOD) reference
+ * descriptor decoder and generator. This descriptor's definition can be found in
+ * ETSI EN 300 468 section 6.2.26.
+ */
+#ifndef DR_4B_H_
+#define DR_4B_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*****************************************************************************
+ * dvbpsi_nvod_ref_t
+ *****************************************************************************/
+/*!
+ * \struct dvbpsi_nvod_ref_t
+ * \brief one "NVOD reference" structure.
+ *
+ * This structure is used since vbidata_t structure will contain several
+ * of these structures
+ */
+/*!
+ * \typedef struct dvbpsi_nvod_ref_s dvbpsi_nvod_ref_t
+ * \brief dvbpsi_nvod_ref_dr_t type definition.
+ */
+/*!
+ * \struct dvbpsi_linkage_s
+ * \brief struct dvbpsi_nvod_ref_s @see dvbpsi_nvod_ref_t
+ */
+typedef struct dvbpsi_nvod_ref_s
+{
+  uint16_t       i_transport_stream_id;         /*!< transport stream id */
+  uint16_t       i_original_network_id;         /*!< original network id */
+  uint16_t       i_service_id;                  /*!< service id */
+} dvbpsi_nvod_ref_t;
+
+/*****************************************************************************
+ * dvbpsi_nvod_ref_dr_t
+ *****************************************************************************/
+/*!
+ * \struct dvbpsi_nvod_ref_dr_t
+ * \brief "NVOD reference" descriptor structure.
+ *
+ * This structure is used to store a decoded "Near Video On Demand (NVOD) reference"
+ * descriptor. (ETSI EN 300 468 section 6.2.26).
+ */
+/*!
+ * \typedef struct dvbpsi_nvod_ref_dr_s dvbpsi_nvod_ref_dr_t
+ * \brief dvbpsi_nvod_ref_dr_t type definition.
+ */
+/*!
+ * \struct dvbpsi_linkage_dr_s
+ * \brief struct dvbpsi_nvod_ref_dr_s @see dvbpsi_nvod_ref_dr_t
+ */
+typedef struct dvbpsi_nvod_ref_dr_s
+{
+  uint8_t               i_references;           /*!< number of nvod references */
+  dvbpsi_nvod_ref_t     p_nvod_refs[43];       /*!< NVOD references */
+} dvbpsi_nvod_ref_dr_t;
+
+/*****************************************************************************
+ * dvbpsi_DecodeNVODReferenceDr
+ *****************************************************************************/
+/*!
+ * \fn dvbpsi_nvod_ref_dr_t * dvbpsi_DecodeNVODReferenceDr(
+                                        dvbpsi_descriptor_t * p_descriptor)
+ * \brief "NVOD reference" descriptor decoder.
+ * \param p_descriptor pointer to the descriptor structure
+ * \return a pointer to a new "NVOD reference" descriptor structure
+ * which contains the decoded data.
+ */
+dvbpsi_nvod_ref_dr_t* dvbpsi_DecodeNVODReferenceDr(dvbpsi_descriptor_t * p_descriptor);
+
+/*****************************************************************************
+ * dvbpsi_GenNVODReferenceDr
+ *****************************************************************************/
+/*!
+ * \fn dvbpsi_descriptor_t *dvbpsi_GenNVODReferenceDr(dvbpsi_nvod_ref_dr_t *p_decoded,
+                                          bool b_duplicate);
+ * \brief "NVOD reference" descriptor generator.
+ * \param p_decoded pointer to a decoded "NVOD reference" descriptor structure
+ * \param b_duplicate if true then duplicate the p_decoded structure into
+ * the descriptor
+ * \return a pointer to a new descriptor structure which contains encoded data.
+ */
+dvbpsi_descriptor_t *dvbpsi_GenNVODReferenceDr(dvbpsi_nvod_ref_dr_t * p_decoded,
+                                         bool b_duplicate);
+
+#ifdef __cplusplus
+};
+#endif
+
+#else
+#error "Multiple inclusions of dr_4b.h"
+#endif /* DR_4B_H_ */
-- 
1.7.5.4