buildroot/package/bento4/0006-Implement-SPS-Frame-parser.patch

From 441247d84e8493a49d234fe062100b049956de90 Mon Sep 17 00:00:00 2001
From: peak3d <pfau@peak3d.de>
Date: Thu, 22 Jul 2021 10:34:42 +0200
Subject: [PATCH] Implement SPS Frame parser

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
---
 Source/C++/Codecs/Ap4AvcParser.cpp | 26 ++++++++++++++++++++++++++
 Source/C++/Codecs/Ap4AvcParser.h   |  5 +++++
 2 files changed, 31 insertions(+)

diff --git a/Source/C++/Codecs/Ap4AvcParser.cpp b/Source/C++/Codecs/Ap4AvcParser.cpp
index 7f4fc34..cfa841d 100644
--- a/Source/C++/Codecs/Ap4AvcParser.cpp
+++ b/Source/C++/Codecs/Ap4AvcParser.cpp
@@ -1112,6 +1112,32 @@ AP4_AvcFrameParser::AppendNalUnitData(const unsigned char* data, unsigned int da
     m_AccessUnitData.Append(new AP4_DataBuffer(data, data_size));
 }
 
+/*----------------------------------------------------------------------
+|   AP4_AvcFrameParser::Feed
++---------------------------------------------------------------------*/
+AP4_Result AP4_AvcFrameParser::ParseFrameForSPS(const AP4_Byte* data, AP4_Size data_size, AP4_UI08 naluLengthSize, AP4_AvcSequenceParameterSet &sps)
+{
+  if (data_size < naluLengthSize)
+    return AP4_ERROR_EOS;
+
+  while (data_size > naluLengthSize)
+  {
+    AP4_Size nalSize(0);
+    for (unsigned int i(0); i < naluLengthSize; ++i) { nalSize = (nalSize << 8) + *data++; };
+    data_size -= naluLengthSize;
+    if (nalSize > data_size)
+      return AP4_ERROR_INVALID_PARAMETERS;
+
+    if ((*data & 0x1F) == AP4_AVC_NAL_UNIT_TYPE_SPS)
+    {
+      AP4_AvcFrameParser fp;
+      return fp.ParseSPS(data, data_size, sps);
+    }
+    data_size -= nalSize;
+  }
+  return AP4_SUCCESS;
+}
+
 /*----------------------------------------------------------------------
 |   AP4_AvcFrameParser::Feed
 +---------------------------------------------------------------------*/
diff --git a/Source/C++/Codecs/Ap4AvcParser.h b/Source/C++/Codecs/Ap4AvcParser.h
index 431a294..99c5320 100644
--- a/Source/C++/Codecs/Ap4AvcParser.h
+++ b/Source/C++/Codecs/Ap4AvcParser.h
@@ -258,6 +258,11 @@ public:
     AP4_AvcFrameParser();
    ~AP4_AvcFrameParser();
     
+   static AP4_Result ParseFrameForSPS(const AP4_Byte* data,
+     AP4_Size data_size,
+     AP4_UI08 naluLengthSize,
+     AP4_AvcSequenceParameterSet &sps);
+
     /**
      * Feed some data to the parser and look for the next NAL Unit.
      *
-- 
2.30.2