Writing software renderer

Creating R packagesPrevious: Writing R documentation filesPrevious: The R distribution itself includes about 30 packages. In the following, we assume that you know the library command, including its lib.

Writing software renderer

The core layer encapsulates most of the functionality of Media Foundation. It consists of the media foundation pipeline, which has three components: A media source is an object that acts as the source of multimedia data, either compressed or uncompressed.

It can encapsulate various data sources, like a file, or a network server or even a camcorder, with source specific functionality abstracted by a common interface. A source object can use a source resolver object which creates a media source from an URIfile or bytestream.

Support for non-standard protocols can be added by creating a source resolver for them. A source object can also use a sequencer object to use a sequence of sources a playlist or to coalesce multiple sources into single logical source.

A media sink is the recipient of processed multimedia data. A media sink can either be a renderer sink, which renders the content on an output device, or an archive sink, which saves the content onto a persistent storage system such as a file.

A renderer sink takes uncompressed data as input whereas an archive sink can take either compressed or uncompressed data, depending on the output type. The data from media sources to sinks are acted upon by MFTs; MFTs are certain functions which transform the data into another form.

The core layer uses services like file access and networking and clock synchronization to time the multimedia rendering.

These are part of the Platform layer, which provides services necessary for accessing the source and sink byte streams, presentation clocks and an object model that lets the core layer components function asynchronously, and is generally implemented as OS services.

Pausing, stopping, fast forward, reverse or time-compression can be achieved by controlling the presentation clock. However, the media pipeline components are not connected; rather they are just presented as discrete components. An application running in the Control layer has to choose which source types, transforms and sinks are needed for the particular video processing task at hand, and set up the "connections" between the components a topology to complete the data flow pipeline.

Or for a video capture application, the camcorder will act as video and audio sources, on which codec MFTs will work to compress the data and feed to a multiplexer that coalesces the streams into a container; and finally a file sink or a network sink will write it to a file or stream over a network.

The application also has to co-ordinate the flow of data between the pipeline components.

Writing software renderer

The control layer has to "pull" request samples from one pipeline component and pass it onto the next component in order to achieve data flow within the pipeline. This is in contrast to DirectShow's "push" model where a pipeline component pushes data to the next component.

Media Foundation allows content protection by hosting the pipeline within a protected execution environment, called the Protected Media Path. The control layer components are required to propagate the data through the pipeline at a rate that the rendering synchronizes with the presentation clock.

The rate or time of rendering is embedded as a part of the multimedia stream as metadata. The source objects extract the metadata and pass it over. Metadata is of two types: Coded metadata is handed over to the object that controls the pipeline session, and descriptive metadata is exposed for the application to use if it chooses to.

Media Foundation provides a Media Session object that can be used to set up the topologies, and facilitate a data flow, without the application doing it explicitly. It exists in the control layer, and exposes a Topology loader object.

The application specifies the required pipeline topology to the loader, which then creates the necessary connections between the components. The media session object manages the job of synchronizing with the presentation clock. It creates the presentation clock object, and passes a reference to it to the sink.

It then uses the timer events from the clock to propagate data along the pipeline. It also changes the state of the clock to handle pause, stop or resume requests from the application. They are used in Media Foundation primarily to implement decoders, encoders, mixers and digital signal processors DSPs — between media sources and media sinks.

Their behaviors are more clearly specified. Applications can use MFTs inside the Media Foundation pipeline, or use them directly as stand-alone objects. MFTs can be any of the following type: Audio and video codecs.How do MPAndroidChart renderers work? What is the high-level procedure for writing a custom renderer?

Note: for many questions posted on SO for mpandroidchart the solution is to implement some kind of custom renderer.

This type of bottom up parser is called a shift-reduce parser, because the input is shifted to the right (imagine a pointer pointing first at the input start and moving to . It took a year from when citra started to get to this point This engineering feat was thanks to the hard work of many contributors in both the emulator scene and the 3ds hacking scene, who worked tirelessly to reverse engineer the 3DS GPU, a chip called the PICA DESCRIPTION.

mpv is a media player based on MPlayer and mplayer2. It supports a wide variety of video file formats, audio and video codecs, and subtitle types. Special input URL types are available to read input from a variety of sources other than disk files.

Mar 20,  · Last few days I’ve been writing an abstraction layer so that I can switch between directx/software. I’ve still got alot of work on eveything (software rendering, animation, resources (textures/meshes etc), lost devices in directx, and much more). The revision ebde3 of the emulator jpcsp was released and built.

Here are the download links: windows-x http://files.e dows-xz windows-x http.

Codec Guide: Answers to Frequently Asked Questions