68 lines
2.3 KiB
Diff
68 lines
2.3 KiB
Diff
From 441247d84e8493a49d234fe062100b049956de90 Mon Sep 17 00:00:00 2001
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From: peak3d <pfau@peak3d.de>
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Date: Thu, 22 Jul 2021 10:34:42 +0200
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Subject: [PATCH] Implement SPS Frame parser
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Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
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---
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Source/C++/Codecs/Ap4AvcParser.cpp | 26 ++++++++++++++++++++++++++
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Source/C++/Codecs/Ap4AvcParser.h | 5 +++++
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2 files changed, 31 insertions(+)
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diff --git a/Source/C++/Codecs/Ap4AvcParser.cpp b/Source/C++/Codecs/Ap4AvcParser.cpp
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index 7f4fc34..cfa841d 100644
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--- a/Source/C++/Codecs/Ap4AvcParser.cpp
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+++ b/Source/C++/Codecs/Ap4AvcParser.cpp
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@@ -1112,6 +1112,32 @@ AP4_AvcFrameParser::AppendNalUnitData(const unsigned char* data, unsigned int da
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m_AccessUnitData.Append(new AP4_DataBuffer(data, data_size));
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}
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+/*----------------------------------------------------------------------
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+| AP4_AvcFrameParser::Feed
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++---------------------------------------------------------------------*/
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+AP4_Result AP4_AvcFrameParser::ParseFrameForSPS(const AP4_Byte* data, AP4_Size data_size, AP4_UI08 naluLengthSize, AP4_AvcSequenceParameterSet &sps)
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+{
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+ if (data_size < naluLengthSize)
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+ return AP4_ERROR_EOS;
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+
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+ while (data_size > naluLengthSize)
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+ {
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+ AP4_Size nalSize(0);
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+ for (unsigned int i(0); i < naluLengthSize; ++i) { nalSize = (nalSize << 8) + *data++; };
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+ data_size -= naluLengthSize;
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+ if (nalSize > data_size)
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+ return AP4_ERROR_INVALID_PARAMETERS;
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+
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+ if ((*data & 0x1F) == AP4_AVC_NAL_UNIT_TYPE_SPS)
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+ {
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+ AP4_AvcFrameParser fp;
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+ return fp.ParseSPS(data, data_size, sps);
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+ }
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+ data_size -= nalSize;
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+ }
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+ return AP4_SUCCESS;
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+}
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+
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/*----------------------------------------------------------------------
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| AP4_AvcFrameParser::Feed
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+---------------------------------------------------------------------*/
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diff --git a/Source/C++/Codecs/Ap4AvcParser.h b/Source/C++/Codecs/Ap4AvcParser.h
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index 431a294..99c5320 100644
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--- a/Source/C++/Codecs/Ap4AvcParser.h
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+++ b/Source/C++/Codecs/Ap4AvcParser.h
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@@ -258,6 +258,11 @@ public:
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AP4_AvcFrameParser();
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~AP4_AvcFrameParser();
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+ static AP4_Result ParseFrameForSPS(const AP4_Byte* data,
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+ AP4_Size data_size,
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+ AP4_UI08 naluLengthSize,
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+ AP4_AvcSequenceParameterSet &sps);
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+
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/**
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* Feed some data to the parser and look for the next NAL Unit.
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*
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--
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2.30.2
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