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package ffmpeg
import (
"context"
"codeberg.org/gruf/go-ffmpreg/embed/ffmpeg"
"codeberg.org/gruf/go-ffmpreg/internal"
"codeberg.org/gruf/go-ffmpreg/util"
"codeberg.org/gruf/go-ffmpreg/wasm"
"github.com/tetratelabs/wazero"
"github.com/tetratelabs/wazero/api"
"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
)
// pool of WASM module instances.
var pool = wasm.InstancePool{
Instantiator: wasm.Instantiator{
// WASM module name.
Module: "ffmpeg",
// Per-instance WebAssembly runtime (with shared cache).
Runtime: func(ctx context.Context) wazero.Runtime {
// Prepare config with cache.
cfg := wazero.NewRuntimeConfig()
cfg = cfg.WithCoreFeatures(ffmpeg.CoreFeatures)
cfg = cfg.WithCompilationCache(internal.Cache)
// Instantiate runtime with our config.
rt := wazero.NewRuntimeWithConfig(ctx, cfg)
// Prepare default "env" host module.
env := rt.NewHostModuleBuilder("env")
env = env.NewFunctionBuilder().
WithGoModuleFunction(
api.GoModuleFunc(util.Wasm_Tempnam),
[]api.ValueType{api.ValueTypeI32, api.ValueTypeI32},
[]api.ValueType{api.ValueTypeI32},
).
Export("tempnam")
// Instantiate "env" module in our runtime.
_, err := env.Instantiate(context.Background())
if err != nil {
panic(err)
}
// Instantiate the wasi snapshot preview 1 in runtime.
_, err = wasi_snapshot_preview1.Instantiate(ctx, rt)
if err != nil {
panic(err)
}
return rt
},
// Per-run module configuration.
Config: wazero.NewModuleConfig,
// Embedded WASM.
Source: ffmpeg.B,
},
}
// Precompile ensures at least compiled ffmpeg
// instance is available in the global pool.
func Precompile(ctx context.Context) error {
inst, err := pool.Get(ctx)
if err != nil {
return err
}
pool.Put(inst)
return nil
}
// Get fetches new ffmpeg instance from pool, prefering cached if available.
func Get(ctx context.Context) (*wasm.Instance, error) { return pool.Get(ctx) }
// Put places the given ffmpeg instance in pool.
func Put(inst *wasm.Instance) { pool.Put(inst) }
// Run will run the given args against an ffmpeg instance from pool.
func Run(ctx context.Context, args wasm.Args) (uint32, error) {
inst, err := pool.Get(ctx)
if err != nil {
return 0, err
}
rc, err := inst.Run(ctx, args)
pool.Put(inst)
return rc, err
}
// Cached returns a cached instance (if any) from pool.
func Cached() *wasm.Instance { return pool.Cached() }
// Free drops all instances
// cached in instance pool.
func Free() {
ctx := context.Background()
for {
inst := pool.Cached()
if inst == nil {
return
}
_ = inst.Close(ctx)
}
}
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