From 20d28e80a5c861a9d5f449ea911ab75b4f37ad0d Mon Sep 17 00:00:00 2001
From: Jef <jef@targetspot.com>
Date: Tue, 24 Sep 2024 14:54:57 +0200
Subject: Initial community commit

---
 Src/Plugins/Input/in_mp4/RawMediaReader.cpp | 145 ++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 Src/Plugins/Input/in_mp4/RawMediaReader.cpp

(limited to 'Src/Plugins/Input/in_mp4/RawMediaReader.cpp')

diff --git a/Src/Plugins/Input/in_mp4/RawMediaReader.cpp b/Src/Plugins/Input/in_mp4/RawMediaReader.cpp
new file mode 100644
index 00000000..4d077a6b
--- /dev/null
+++ b/Src/Plugins/Input/in_mp4/RawMediaReader.cpp
@@ -0,0 +1,145 @@
+#include "RawMediaReader.h"
+#include "virtualIO.h"
+#include <limits.h>
+
+bool IsMyExtension(const wchar_t *filename);
+
+int RawMediaReaderService::CreateRawMediaReader(const wchar_t *filename, ifc_raw_media_reader **out_reader)
+{
+	if (IsMyExtension(filename))
+	{
+		void *unicode_reader = CreateUnicodeReader(filename);
+		if (!unicode_reader )
+			return NErr_FileNotFound;
+
+		MP4FileHandle mp4 = MP4ReadEx(filename, unicode_reader, &UnicodeIO);
+		if (!mp4) 
+		{
+			DestroyUnicodeReader(unicode_reader);
+			return NErr_Malformed;
+		}
+
+
+		RawMediaReader *reader = new RawMediaReader(mp4, unicode_reader);
+		if (!reader)
+		{
+			MP4Close(mp4); 
+			DestroyUnicodeReader(unicode_reader); 
+			return NErr_OutOfMemory;
+		}
+
+		*out_reader = reader;
+		return NErr_Success;
+	}
+	else
+	{
+		return NErr_False;
+	}
+}
+
+#define CBCLASS RawMediaReaderService
+START_DISPATCH;
+CB(CREATERAWMEDIAREADER, CreateRawMediaReader);
+END_DISPATCH;
+#undef CBCLASS
+
+RawMediaReader::RawMediaReader(MP4FileHandle file, void *reader) : file(file), reader(reader)
+{
+	track_num=0;
+	number_of_tracks=MP4GetNumberOfTracks(file);
+	current_track = MP4_INVALID_TRACK_ID;
+	chunk_position=0;
+	chunk_size=0;
+	chunk_buffer=0;
+}
+
+RawMediaReader::~RawMediaReader()
+{
+	if (chunk_buffer)
+		MP4Free(chunk_buffer);
+	MP4Close(file); 
+	DestroyUnicodeReader(reader);
+}
+
+int RawMediaReader::ReadNextChunk()
+{
+again:
+	/* see if it's time to cycle to the next track */
+	if (current_track == MP4_INVALID_TRACK_ID)
+	{
+		if (track_num == number_of_tracks)
+			return NErr_EndOfFile;
+
+		current_track = MP4FindTrackId(file, track_num);
+		if (current_track == MP4_INVALID_TRACK_ID)
+			return NErr_EndOfFile;
+
+		track_num++;
+
+		const char* trackType = MP4GetTrackType(file, current_track);
+		if (!MP4_IS_AUDIO_TRACK_TYPE(trackType) && !MP4_IS_VIDEO_TRACK_TYPE(trackType))
+		{
+			current_track = MP4_INVALID_TRACK_ID;
+			goto again;
+		}
+
+		chunk_id = 1;
+		number_of_chunks= MP4GetTrackNumberOfChunks(file, current_track);		
+	}
+
+	/* see if we've read all of our samples */
+	if (chunk_id > number_of_chunks)
+	{
+		current_track = MP4_INVALID_TRACK_ID;
+		goto again;
+	}
+
+	bool readSuccess = MP4ReadChunk(file, current_track, chunk_id, &chunk_buffer, &chunk_size);
+	if (!readSuccess)
+		return NErr_Error;
+
+	chunk_position=0;
+	chunk_id++;
+	return NErr_Success;
+}
+
+int RawMediaReader::Read(void *buffer, size_t buffer_size, size_t *bytes_read)
+{
+	if (buffer_size > INT_MAX)
+		return NErr_BadParameter;
+
+	if (chunk_position==chunk_size)
+	{
+		MP4Free(chunk_buffer);
+		chunk_buffer=0;
+	}
+
+	if (!chunk_buffer)
+	{
+		int ret = ReadNextChunk();
+		if (ret != NErr_Success)
+			return ret;
+	}
+
+	size_t to_read = chunk_size-chunk_position;
+	if (to_read > buffer_size)
+		to_read = buffer_size;
+
+	memcpy(buffer, &chunk_buffer[chunk_position], to_read);
+	chunk_position += to_read;
+	*bytes_read = to_read;
+	return NErr_Success;
+}
+
+size_t RawMediaReader::Release()
+{
+	delete this;
+	return 0;
+}
+
+#define CBCLASS RawMediaReader
+START_DISPATCH;
+CB(RELEASE, Release);
+CB(RAW_READ, Read);
+END_DISPATCH;
+#undef CBCLASS
\ No newline at end of file
-- 
cgit