libgavl.hpp File Reference

Concrete implementation of the MediaImplLib facade to work with lib-GAVL, a library for handling basic raw video data formats. More...

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Description

Concrete implementation of the MediaImplLib facade to work with lib-GAVL, a library for handling basic raw video data formats.

Todo:

a draft and placeholder code from 2008, at which time the intention was to rely on libGAVL for processing of raw media data. This seemed like a good idea at that time, but we should re-evaluate if libGAVL is maintained and in actual use, before we start really relying on it.

2025 this code is a kind of architecture placeholder — it is clear that a solution can can not be that simple, but any viable solution will rely onto an approach like outlined here: provide a façade interface, which has to be implemented by any plug-in component to provide access to the processing capabilities of a specific library. The access point functions exposed on the facade however must be shaped by the specific way how the builder and the render engine interacts with and delegates back to the media-handling library. Such an interface can not be based on first principles alone.

2025 I still retain the dependency on lib-GAVL for now, even while we never got into actually using it. Simply because I still consider this library exemplary, and would love to use it for real. Yet it remains to be seen if the project actually gets a chance to do so, simply because FFmpeg roughly covers the same ground. Presumably it turns out to be a basic requirement to ship a plug-in with FFmpeg binding. Furthermore, one especially tricky aspect is how to support displays with extended dynamic range – a requirement which has the potential to blur the notion of »raw video«...

Definition in file libgavl.hpp.

#include "steam/control/media-impl-lib.hpp"

Namespaces
namespace	steam
	Steam-Layer implementation namespace root.
namespace	steam::external

Typedefs
using	ImplFacade = StreamType::ImplFacade
using	TypeTag = StreamType::ImplFacade::TypeTag

Classes
class	ImplFacadeGAVL
	Concrete media lib implementation facade allowing to work with GAVL data frames and types in an implementation agnostic way. More...
class	LibGavl