This is gavl, a common support library for other packages of the gmerlin project.
It is developed in Linux (PC and Raspberry Pi 4).

Porting it to non-Linux platforms might cause major headaches. Since it's a
one-man project, I gave up on not using the great Linux/glibc/gcc features only
because other OSes (which I never use) don't have them.

Read the file INSTALL for detailed installation instructions.

The original purpose was to provide data structures and routines for handling
uncompressed audio- and video data. Over the years it became a central
repository for code, which is shared by the gmerlin package and the
gmerlin-avdecoder library. It's main purpose is to make the gmerlin-avdecoder
library independent from the (huge) gmerlin package.

In the future, more stuff might get moved from libgmerlin to libgavl.

Below is (probably incomplete) list of contained modules:

- Handling of uncompressed audio and video data (gavl.h)

- Handling of compressed audio and video data (compression.h)

- Handling of A/V data stored in special ways for hardware acceleration (hw*.h)

- Connectors (source and sink) for compressed and uncompressed A/V data. They
  usually work in zero-copy mode but can also do implicit A/V conversions when
  necessary (connectors.h)
  
- Polymorphic data containers with high-level types like arrays and dictionaries.
  These are used throughout the whole gmerlin project for non A/V data like
  metadata or configuration data (value.h).
  Libgmerlin contains serializations for XML and JSON so complex data structures
  can be saved to or loaded from files in one function call.
      
- Generic socket support code (gavlsocket.h)

- An http-client with support for:
  * Non-blocking I/O for background downloading without a separate thread
  * Redirection
  * https (via gnutls)
  * Seeking
  (httpclient.h)

- An experimental A/V container format for internal usage, currently unused and
  probably not functional (gavf/gavf.h)

- A message structure used throughout the whole gmerlin project for
  communication, both inside the applications and between them.
  libgmerlin contains a serialization for JSON and a message queue for robust
  inter-thread communication.

- Logging support (log.h)

- Lots of utility functions (util.h)