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package wasm
import (
"context"
"github.com/tetratelabs/wazero"
"github.com/tetratelabs/wazero/api"
"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
)
// CoreFeatures are the WebAssembly Core specification
// features our embedded binaries are compiled with.
const CoreFeatures = api.CoreFeatureSIMD |
api.CoreFeatureBulkMemoryOperations |
api.CoreFeatureNonTrappingFloatToIntConversion |
api.CoreFeatureMutableGlobal |
api.CoreFeatureReferenceTypes |
api.CoreFeatureSignExtensionOps
// NewRuntime returns a new WebAssembly wazero.Runtime compatible with go-ffmpreg.
func NewRuntime(ctx context.Context, cfg wazero.RuntimeConfig) (wazero.Runtime, error) {
var err error
if cfg == nil {
// Ensure runtime config is set.
cfg = wazero.NewRuntimeConfig()
}
// Set core features ffmpeg compiled with.
cfg = cfg.WithCoreFeatures(CoreFeatures)
// Instantiate runtime with prepared config.
rt := wazero.NewRuntimeWithConfig(ctx, cfg)
// Prepare default "env" host module.
env := rt.NewHostModuleBuilder("env")
// Register setjmp host function.
env = env.NewFunctionBuilder().
WithGoModuleFunction(
api.GoModuleFunc(setjmp),
[]api.ValueType{api.ValueTypeI32},
[]api.ValueType{api.ValueTypeI32},
).Export("setjmp")
// Register longjmp host function.
env = env.NewFunctionBuilder().
WithGoModuleFunction(
api.GoModuleFunc(longjmp),
[]api.ValueType{api.ValueTypeI32, api.ValueTypeI32},
[]api.ValueType{},
).Export("longjmp")
// Instantiate "env" module.
_, err = env.Instantiate(ctx)
if err != nil {
return nil, err
}
// Instantiate the wasi snapshot preview 1 in runtime.
_, err = wasi_snapshot_preview1.Instantiate(ctx, rt)
if err != nil {
return nil, err
}
return rt, nil
}
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