Encoded Data

EncodedData Struct

The EncodedData struct represents H.264 encoded data after encoding operation. Provides access to the data and its associated metadata.

Table of Contents

• Overview
• Struct Definition
• Properties
• Methods
• Usage Examples

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Overview

The EncodedData struct encapsulates the encoded H.264 data along with metadata such as frame type, layer number, and temporal/spatial/quality identifiers. It is designed to efficiently manage and access encoded data, providing methods for copying and retrieving the data.

Features:

• Holds H.264 encoded data and metadata.
• Provides methods to retrieve data as a managed byte array.
• Supports copying data to streams and byte arrays.

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Properties

Property	Type	Description
DataPointer	IntPtr	Pointer to the unmanaged encoded data.
Length	int	Length of the encoded data in bytes.
FrameType	FrameType	Type of the encoded frame (e.g., I-frame, P-frame).
LayerNum	int	Layer number of the encoded data.
TemporalId	byte	Temporal identifier.
SpatialId	byte	Spatial identifier.
QualityId	byte	Quality identifier.
LayerType	byte	Layer type.
SubSeqId	int	Sub-sequence identifier.

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Methods

Method	Return Type	Description
GetBytes()	byte[]	Creates a new managed byte array from the unmanaged data.
WriteTo(Stream s)	void	Copies the unmanaged data to a stream.
CopyTo(byte[] buffer, int startIndex)	int	Copies the unmanaged data to a byte array starting at the specified index.

Extentions

Method	Return Type	Description
GetAllBytes(this EncodedData[] datas)	byte[]	Copies an array of EncodedData to a new managed byte array.
CopyAllTo(this EncodedData[] datas, byte[] toBuffer, int startIndex)	int	Copies an array of EncodedData to a provided buffer in contiguous order.
GetTotalSize(this EncodedData[] datas)	int	Gets the total size of all bytes in the collection.

Examples

Copying Encoded Data to a Byte Array

byte[] buffer = new byte[encodedData.Length + 10];
int bytesWritten = encodedData.CopyTo(buffer, 5); // Copy starting at index 5

Copying Encoded Data to a MemoryStream

using (var stream = new MemoryStream())
{
    encodedData.WriteTo(stream);
    // ... use the stream ...
}

Copying Encoded Data Array

EncodedData[] encodedDataArray = new EncodedData[] { /* ... */ };

// Get all bytes as a single array
byte[] allBytes = encodedDataArray.GetAllBytes();

// Copy all bytes to a buffer
byte[] buffer = new byte[encodedDataArray.GetTotalSize() + 10];
int bytesWritten = encodedDataArray.CopyAllTo(buffer, 5);

// Get total size
int totalSize = encodedDataArray.GetTotalSize();

}