I have finally checked our new media processing library - the Zap Media 
Kit (ZMK) - into CVS.
The ZMK features a "mediagraph" component which runs with its own thread 
and event queue and manages a set of  media processing nodes and data 
connections between them.

Some features include:
- new node classes (codecs, filters, etc) can be implemented as xpcom 
plugins.
- nodes can be composed to form larger nodes.
- the media graph can be dynamically reconfigured at any time (by 
adding/removing nodes and/or connections).
- dataflow is regulated by a simple 2 state protocol: a sink requests 
the next frame from its attached source (Connection state: WAITING). The 
source responds with the next frame as soon as it is available (either 
synchronously or asynchronously) (Connection state: IDLE).
- control interfaces for media nodes (e.g. for changing codec parameters 
or for UI feedback) are automatically and transparently proxied onto the 
media thread. Media node authors need not worry about concurrency issues.
- built-in media node types include: audioin, audioout, rtp-session, 
speex-encoder, speex-decoder, speex-rtp-packetizer, 
speex-rtp-depacketizer, buffer, udp-socket, udp-socket-pair.

Some documentation will follow shortly on http://www.croczilla.com/zap/zmk.

- Alex

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Hi,

The compilation of zapAudioIn.cpp fails under Linux:

/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.h:84: error:
‘zapAudioInState’ has not been declared
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.h:86: error: ISO
C++ forbids declaration of ‘zapAudioInState’ with no type
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.h:86: error:
expected ‘;’ before ‘*’ token
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In
constructor ‘zapAudioIn::zapAudioIn()’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:51: error:
class ‘zapAudioIn’ does not have any field named ‘mState’
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘virtual nsresult zapAudioIn::ConnectSink(zapIMediaSink*, const
nsACString_internal&)’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:186: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘virtual nsresult zapAudioIn::DisconnectSink(zapIMediaSink*,
const nsACString_internal&)’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:194: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘virtual nsresult zapAudioIn::RequestFrame()’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:201: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘virtual nsresult zapAudioIn::Play()’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:211: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘virtual nsresult zapAudioIn::Stop()’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:218: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: At global scope:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:311: error:
prototype for ‘void zapAudioIn::ChangeState(zapAudioInState*)’ does not
match any in class ‘zapAudioIn’
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.h:84: error:
candidate is: void zapAudioIn::ChangeState(int*)
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘void zapAudioIn::ChangeState(zapAudioInState*)’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:313: error:
‘mState’ was not declared in this scope
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp: In member
function ‘void zapAudioIn::SendFrame(const nsACString_internal&,
double)’:
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:399: warning:
comparison between signed and unsigned integer expressions
/home/petithug/mozilla/mozilla/zap/zmk/src/zapAudioIn.cpp:410: error:
‘mState’ was not declared in this scope


Alex Fritze wrote:[...]


- --
Marc Petit-Huguenin
Home: marc(at)petit-huguenin.org
Work: marc(at)8x8.com
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Marc Petit-Huguenin wrote:
[...]
Seems like whatever compiler you are using doesn't recognise friend 
declarations as normal declarations.
Fix checked in.

- Alex

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Alex Fritze wrote:[...][...][...]

I use gcc 4.0.1
[...]


- --
Marc Petit-Huguenin
Home: marc(at)petit-huguenin.org
Work: marc(at)8x8.com
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