Reconstructed frame caching
Systems and methods for processing input media in a computing device are described. In one aspect, a reconstructed frame is cached according to a set of criteria. A request to scrub to a predictive frame of input media is received. Responsive to receiving the request, the predictive frame is decoded starting with the reconstructed frame.
1. A computing device for processing input media, the computing device comprising:
a processor; and
a physical memory coupled to the processor, the memory comprising computer-program instructions executable by the processor for:
during playback of a media stream, caching a reconstructed frame according to a plurality of criteria, wherein the reconstructed frame comprises a decoded multimedia content frame, and wherein the criteria for caching the reconstructed frame is based on:
a detected display device resolution,
repeated requests for similar frames of input media,
an indication that a playback application has reverse playback capability, and
a received request from a playback application to play a given section of content in reverse;
receiving a request to scrub to a predictive frame of input media, the predictive frame following an intracoded frame within a group of pictures; and
decoding the predictive frame starting with the reconstructed frame.
2. A computing device as recited in claim 1 , wherein the caching is by a media engine, a media processor, a media decoder, or an effect transform component of a media pipeline.
3. A computing device as recited in claim 1 , wherein the request to scrub is sent by an application that is independent of a media processing pipeline, and wherein the criteria is further based on periodic time intervals, decoded frame size, available system memory, a requested playback rate, a detected display device resolution, and a determination that the application repeatedly requests similar frames of input media.
4. A computing device as recited in claim 1 , wherein the caching is by a component in a media pipeline.
5. A computing device as recited in claim 1 , wherein responsive to receiving the request and before decoding, the computer-program instructions further comprise instructions for:
determining that there is a cached reconstructed frame representing a complete decoded version of an inter-frame of the input media, the cached reconstructive frame being associated with a time less than or equal to a time of the predictive frame; and
wherein the cached reconstructed frame is the reconstructed frame.
6. A computing device as recited in claim 5 , wherein the request is sent by an application that is independent of a media processing pipeline and wherein the reconstructed frame is a latest reconstructed frame in a timeline specified by the input media or the application.
7. A computing device as recited in claim 1 , wherein the request is sent by an application that is independent of a media processing pipeline, and wherein the application enables reconstructed frame caching.
8. A computing device as recited in claim 1 , wherein the request is sent by an application that is independent of a media processing pipeline, and wherein the computer-program instructions further comprise receiving, from the application, a location in the media processing pipeline to implement the reconstructed frame caching.
9. A computing device as recited in claim 8 , wherein the location is subsequent to an effect transform component that operates on decoded frames of the input media.
10. A computing device as recited in claim 8 , wherein the location is immediately subsequent to a media decoding module.