On Fri, Jan 4, 2013 at 1:24 PM, Vicente J. Botet Escriba < vicente.botet@wanadoo.fr> wrote:
Le 04/01/13 11:36, Marcus Tomlinson a écrit :
On 04 Jan 2013, at 11:46 AM, "Vicente J. Botet Escriba" <
vicente.botet@wanadoo.fr> wrote:
Le 04/01/13 08:51, Marcus Tomlinson a écrit :
* You use a bus of input/output untyped signals. Why the signals are not
typed?
1. Flexibility - inputs and outputs can dynamically accept changing signal types. E.g. Varying sample size in an audio stream.
I don't know why this couldn't be modeled with a vector signal containing the samples. Maybe you have other examples needing untyped iunterfaces.
Sorry, audio jargon. Sample size - the size of each sample. So changing a vector<char> to a vector<int> for example. The sample type needs to change hence the vector variable needs to change.
Could you show a simple example that makes use of this kind of changes? BTW, what happens when you connect a char and you try to get/set an int or a complex? Do you get an exception?
Here's an example of the above vector<char> to a vector<int> situation (this component sets the gain of the audio signal passing through it): virtual void Process_( DspSignalBus& inputs, DspSignalBus& outputs ) { // Audio input of char samples std::vector< char > _charStream; if( inputs.GetValue( 0, _charStream ) ) { for( unsigned long i = 0; i < _charStream.size(); i++ ) { _charStream[i] *= _gain; } outputs.SetValue( 0, _charStream ); } // Audio input of int samples std::vector< int > _intStream; else if( inputs.GetValue( 0, _intStream ) ) { for( unsigned long i = 0; i < _intStream.size(); i++ ) { _intStream[i] *= _gain; } outputs.SetValue( 0, _intStream ); } } The GetValue() and SetValue() methods simply return false if the type you're trying to get/set is mismatched. We use this in order to determine what data we have received.
It seems that more tutorials/examples are needed.
Agreed.