[libdvbpsi-devel] Implement support for the smoothing buffer descriptor (0x10)
Daniel Kamil Kozar
git at videolan.org
Mon Mar 2 10:46:28 CET 2015
libdvbpsi | branch: master | Daniel Kamil Kozar <dkk089 at gmail.com> | Sun Mar 1 21:46:11 2015 +0100| [cc058443a6c9c0ee32b93f27bba302cf8c58f468] | committer: Jean-Paul Saman
Implement support for the smoothing buffer descriptor (0x10)
This patch adds support for the smoothing buffer descriptor, as described in
the latest (10/2014) ISO/IEC 13818-1 specification.
Comments welcome.
> http://git.videolan.org/gitweb.cgi/libdvbpsi.git/?a=commit;h=cc058443a6c9c0ee32b93f27bba302cf8c58f468
---
src/Makefile.am | 2 ++
src/descriptors/dr_10.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++
src/descriptors/dr_10.h | 81 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 172 insertions(+)
diff --git a/src/Makefile.am b/src/Makefile.am
index 43011bc..ab4751f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -34,6 +34,7 @@ pkginclude_HEADERS = dvbpsi.h psi.h descriptor.h demux.h \
descriptors/dr_0d.h \
descriptors/dr_0e.h \
descriptors/dr_0f.h \
+ descriptors/dr_10.h \
descriptors/dr_13.h \
descriptors/dr_14.h \
descriptors/dr_40.h \
@@ -88,6 +89,7 @@ descriptors_src = descriptors/dr_02.c \
descriptors/dr_0d.c \
descriptors/dr_0e.c \
descriptors/dr_0f.c \
+ descriptors/dr_10.c \
descriptors/dr_13.c \
descriptors/dr_14.c \
descriptors/dr_40.c \
diff --git a/src/descriptors/dr_10.c b/src/descriptors/dr_10.c
new file mode 100644
index 0000000..3c269d0
--- /dev/null
+++ b/src/descriptors/dr_10.c
@@ -0,0 +1,89 @@
+/*
+Copyright (C) 2015 Daniel Kamil Kozar
+
+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 <stdlib.h>
+#include <stdbool.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_10.h"
+
+dvbpsi_smoothing_buffer_dr_t* dvbpsi_DecodeSmoothingBufferDr(
+ dvbpsi_descriptor_t * p_descriptor)
+{
+ dvbpsi_smoothing_buffer_dr_t * p_decoded;
+
+ /* check the tag. */
+ if (!dvbpsi_CanDecodeAsDescriptor(p_descriptor, 0x10))
+ return NULL;
+
+ /* don't decode twice. */
+ if (dvbpsi_IsDescriptorDecoded(p_descriptor))
+ return p_descriptor->p_decoded;
+
+ /* all descriptors of this type have 6 bytes of payload. */
+ if (p_descriptor->i_length != 6)
+ return NULL;
+
+ p_decoded = (dvbpsi_smoothing_buffer_dr_t*)malloc(sizeof(*p_decoded));
+ if (!p_decoded)
+ return NULL;
+
+ p_decoded->i_sb_leak_rate =
+ (((uint32_t)p_descriptor->p_data[0] & 0x3f) << 16)
+ | ((uint32_t)p_descriptor->p_data[1] << 8)
+ | p_descriptor->p_data[2];
+
+ p_decoded->i_sb_size =
+ (((uint32_t)p_descriptor->p_data[3] & 0x3f) << 16)
+ | ((uint32_t)p_descriptor->p_data[4] << 8)
+ | p_descriptor->p_data[5];
+
+ p_descriptor->p_decoded = (void*)p_decoded;
+
+ return p_decoded;
+}
+
+dvbpsi_descriptor_t * dvbpsi_GenSmoothingBufferDr(
+ dvbpsi_smoothing_buffer_dr_t * p_decoded)
+{
+ dvbpsi_descriptor_t * p_descriptor = dvbpsi_NewDescriptor(0x10, 6, NULL);
+ if (!p_descriptor)
+ return NULL;
+
+ /* encode the data, making sure the reserved fields are set to all ones. */
+ p_descriptor->p_data[0] = (p_decoded->i_sb_leak_rate >> 16) | 0xc0;
+ p_descriptor->p_data[1] = p_decoded->i_sb_leak_rate >> 8;
+ p_descriptor->p_data[2] = p_decoded->i_sb_leak_rate;
+
+ p_descriptor->p_data[3] = (p_decoded->i_sb_size >> 16) | 0xc0;
+ p_descriptor->p_data[4] = p_decoded->i_sb_size >> 8;
+ p_descriptor->p_data[5] = p_decoded->i_sb_size;
+
+ return p_descriptor;
+}
diff --git a/src/descriptors/dr_10.h b/src/descriptors/dr_10.h
new file mode 100644
index 0000000..d2a4f22
--- /dev/null
+++ b/src/descriptors/dr_10.h
@@ -0,0 +1,81 @@
+/*
+Copyright (C) 2015 Daniel Kamil Kozar
+
+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_10.h>
+ * \author Daniel Kamil Kozar <dkk089 at gmail.com>
+ * \brief Application interface for the MPEG-2 smoothing buffer descriptor
+ * decoder and generator.
+ *
+ * Application interface for the MPEG-2 smoothing buffer descriptor decoder and
+ * generator. This descriptor's definition can be found in ISO/IEC 13818-1
+ * revision 2014/10 section 2.6.30.
+ */
+
+#ifndef _DVBPSI_DR_10_H_
+#define _DVBPSI_DR_10_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*!
+ * \struct dvbpsi_smoothing_buffer_dr_s
+ * \brief Smoothing buffer descriptor structure.
+ *
+ * This structure is used to store a decoded smoothing buffer descriptor.
+ * (ISO/IEC 13818-1 section 2.6.30).
+ */
+
+/*!
+ * \typedef struct dvbpsi_smoothing_buffer_dr_s dvbpsi_smoothing_buffer_dr_t
+ * \brief dvbpsi_smoothing_buffer_dr_t type definition.
+ */
+typedef struct dvbpsi_smoothing_buffer_dr_s
+{
+ /*! Value of the leak rate out of the SBn buffer, in units of 400 bits/s. */
+ uint32_t i_sb_leak_rate;
+
+ /*! Value of the size of the multiplexing buffer smoothing buffer SBn. */
+ uint32_t i_sb_size;
+} dvbpsi_smoothing_buffer_dr_t;
+
+/*!
+ * \brief Smoothing buffer descriptor decoder.
+ * \param p_descriptor pointer to the descriptor structure
+ * \return A pointer to a new smoothing buffer descriptor structure which
+ * contains the decoded data.
+ */
+dvbpsi_smoothing_buffer_dr_t* dvbpsi_DecodeSmoothingBufferDr(
+ dvbpsi_descriptor_t * p_descriptor);
+
+/*!
+ * \brief Smoothing buffer descriptor generator.
+ * \param p_decoded pointer to a decoded smoothing buffer descriptor structure.
+ * \return a pointer to a new descriptor structure which contains encoded data.
+ */
+dvbpsi_descriptor_t * dvbpsi_GenSmoothingBufferDr(
+ dvbpsi_smoothing_buffer_dr_t * p_decoded);
+
+#ifdef __cplusplus
+}
+#endif
+
+#else
+#error "Multiple inclusions of dr_10.h"
+#endif
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