Chapter 12: Writing DirectShow Source Filters

Chapter 12

Writing DirectShow Source Filters

Of the three classes of Microsoft DirectShow filters source, transform, and renderer the source filter is the one that generates the stream data manipulated by the filter graph. Every filter graph has at least one source filter, and by its nature the source filter occupies the ultimate upstream position in the filter graph, coming before any other filters. The source filter is responsible for generating a continuous stream of media samples, beginning when the Filter Graph Manager runs the filter graph and ceasing when the filter graph is paused or stopped.