amffi 0.0.1

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Supported

amf-bindings are a set of bindings to the Advanced Media Framework C++ API.

This wraps AMF in an cross platform COM style API, in a similar way to AMDs own examples.

32-bit environments are currently supported through the usage of macros to change the calling convention between x86_64 and x86, and any breakage is considered a bug

#include "public/common/AMFFactory.h"

int main() {
    AMF_RESULT res = AMF_OK;
    res = g_AMFFactory.Init();

    amf::AMFContextPtr context;
    res = g_AMFFactory.GetFactory()->CreateContext(&context);
}

use amf_bindings::amf_init;
use amf_bindings::version::AMF_VERSION;
use amf_bindings::factory::AMFFactory;
use amf_bindings::context::AMFContext;

fn main() {
    let library = amf_init().unwrap();

    let factory: AMFFactory = library.init_factory(AMF_VERSION).unwrap();
    let context: AMFContext = factory.create_context().unwrap();
}

This creates an AMF context, which can then be used like a COM-API

Certain APIs, such as buffer observers, have been wrapped to create a more idiomatic feeling API, such as

fn import_dx_buffer(context: &AMFContext, buffer: &ID3D11Texture2D) {
    let surface: AMFSurface = context.create_surface_from_dx11_native(buffer);
    surface.add_observer(|surface: AMFSurface| {
        println!("Releasing!");
    });
}

This is done by creating trait wrappers for the equivalent C++ interface, such as:

pub trait SurfaceObserver {
    fn on_surface_data_release(&mut self, surface: AMFSurface);
}

And wrapping them in a struct equivalent to how the AMD driver expects them, like so:

#[repr(C)]
pub(crate) struct InternalSurfaceObserver<T: SurfaceObserver> {
    vtbl: &'static AMFSurfaceObserverVtbl,
    this: T,
}

impl<T: SurfaceObserver> InternalSurfaceObserver<T> {
    pub(crate) fn new(observer: T) -> Self {
        Self {
            vtbl: &AMFSurfaceObserverVtbl {
                on_surface_data_release: internal_observer::<T>,
            },
            this: observer,
        }
    }
}

stdcall! {
    fn internal_observer<T: SurfaceObserver>(this: *mut *const AMFSurfaceObserverVtbl, surface: AMFSurface) {
        let this = unsafe { &mut *(this as *mut InternalSurfaceObserver<T>) };
        this.this.on_surface_data_release(surface);
    }
}

class AMF_NO_VTABLE AMFSurfaceObserver
{
public:
    virtual void AMF_STD_CALL OnSurfaceDataRelease(AMFSurface* pSurface) = 0;
};

Not all features are currently implemented, but are planned. AMF Dump, Trace, and Debug are the next planned features. Things such as Compute, D3D12, HEVC and AV1 are all going to be implemented as time and money allow.