Messages

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General discussions / Re: SFML 3 - What is your vision?

« on: July 05, 2014, 04:44:55 am »

How can I tell how many samples to load with soundBuffer.loadFromStream()? It seems to me that it loads the entire sound data too (from a file or a stream that contains an audio entity), and already sends it to OpenAL with alBufferData(). Or am I missing something?
By "audio streaming", I really mean to read a part of an audio entity and play it while the next part is loaded chunk by chunk, wether it is from a file or a C++ input stream (it's a bit ambiguous I guess).

2

General discussions / Re: SFML 3 - What is your vision?

« on: July 05, 2014, 04:10:17 am »

It is even explained that you would want to derive from it to implement your own class that streams data from whatever source you want,  including a filter you wrote

I know, but a filter wouldn't be a source here, just some code between the raw samples and the filtered samples. The real source would be a file, and since the SoundFile wrapper is not exposed, it's difficult to stream them simply. I could use sf::SoundBuffers as in the tutorials, but it's not file streaming.

3

General discussions / Re: SFML 3 - What is your vision?

« on: July 05, 2014, 03:23:33 am »

Ok, I understand for hardware...
For software effects, I actually meant "real-time" ones, those we could tweak while the sound is playing. I don't know how it would be done for sf::Sounds since they are entirely uploaded to OpenAL before playing. But for streams, it would need to override onGetData() and perform the effect before returning the chunk. However, there is a SoundFile class here that is not exposed to the API ^^"

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General discussions / Re: SFML 3 - What is your vision?

« on: July 05, 2014, 02:47:42 am »

I remember there is an EFX extension to OpenAL that handles some effects. But if it can't be hardware-accelerated, could software post-processing be achieved (like many audio softwares do) as well by the ability to write filtering code before the samples to be sent to OpenAL?

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General discussions / Re: SFML 3 - What is your vision?

« on: July 05, 2014, 01:37:31 am »

I don't think it has been mentionned before, but adding audio effects and more fine-grained control would be great. It seems to me that the area is often lacking features :p

As the graphics API supports shaders, it would be nice to be able to (at least) apply audio filters to create reverberations, echos, convolutions, 3D effects etc. 

I agree to the need for loop points too, especially when streaming audio. Also, if possible, an option for low-latency playing of streamed sounds (preload first chunks on openFromFile())?