QMediaDecoder

QMediaDecoder is a C++ class developed by Nokia, now owned by The Qt Company, as part of the Qt Multimedia module. It provides a way to decode multimedia streams, such as audio or video, into a format that can be processed or played by other Qt classes.

QMediaDecoder uses a decoder to extract the raw data from the encoded stream and convert it into a usable format. This process is typically handled by a specific module or plugin, which can load the necessary decoding libraries and initialize the decoding context.

When initiated, QMediaDecoder reads the stream from a file or directly from an external source, and provides methods for updating the current position and stopping, starting, or resetting the decoding process. The class also offers support for parsing and displaying information about the audio or video stream, such as the resolution and codec used.

QMediaDecoder serves as a foundation for classes like QMediaPlayer, which can play back the decoded stream directly or use it as an input for processing or encoding. The class can also be used within embedded applications, such as on embedded systems or Symbian devices, where it allows developers to access and play multimedia streams without extensive platform-related code.

Developers can easily integrate QMediaDecoder into multimedia-enabled Qt applications, such as multimedia players or video editors. Its versatile architecture and customization options enable direct access to media formats, facilitating support for a large diversity of media files.