README.md

libvpx-Delphi

Library for encoding 32 bits bitmap images using VP8 or VP9 codecs and decoding IVF files to 32 bits bitmap images. The main headers of libvpx by Google have been converted.

This works binding the libvpx and libyuv dynamic link library.

The necessary DLL files are made available in this repository.

Usage

1. Add to your project the codec folder.
2. Add DLL files from the bin folder in the same location as the executable.
3. Add to your main unit the VPXEncoder.pas and VPXDecoder.pas

uses
VPXEncoder,VPXDecoder;

Encoding

var
  Encoder: TVpxEncoder;
  EncodedStream: TMemoryStream;
  Bitmap: TBitmap;
begin
  Encoder := TVpxEncoder.Create(vctVP8); //vctVP9 for VP9 
  try
    Bitmap := TBitmap.Create;
    try
      Bitmap.LoadFromFile('C:\temp\sample.bmp');
      EncodedStream := Encoder.Encode(Bitmap);
      try
        EncodedStream.SaveToFile('C:\temp\output.ivf');
      finally
        EncodedStream.Free;
      end;
    finally
      Bitmap.Free;
    end;
  finally
    Encoder.Free;
  end;

Decoding

var
  Decoder: TVpxDecoder;
  InputStream: TMemoryStream;
  OutputBitmap: TBitmap;
begin
  Decoder := TVpxDecoder.Create;
  try
    InputStream := TMemoryStream.Create;
    try
      InputStream.LoadFromFile('C:\temp\output.ivf');
      OutputBitmap := Decoder.Decode(InputStream);
      if Assigned(OutputBitmap) then
      begin
        try
          OutputBitmap.SaveToFile('C:\temp\output.bmp');
        finally
          OutputBitmap.Free;
        end;
      end;
    finally
      InputStream.Free;
    end;
  finally
    Decoder.Free;
  end;

Demo

In the demo folder a GUI example to encode screen capture to IVF and decode the IVF to bitmap.

WebM documentation

https://www.webmproject.org/docs/

Contributing

Contributions are welcome! If you have suggestions or bug fixes, please fork the repository and submit a pull request.

Made with ❤️ using Delphi RAD Studio