libavcodec
· The libavcodec library provides a generic encoding/decoding framework and contains multiple decoders
and encoders for audio, video and subtitle streams, and several bitstream filters.
The shared architecture provides various services ranging from bit stream I/O to DSP optimizations, and makes
it suitable for implementing robust and fast codecs as well as for experimentation.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window libavcodec-4.0.0.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.