[chore] pull in go-ffmpreg v0.4.1 (#3485)

* pull in go-ffmpreg v0.4.1

* bring back GTS_WAZERO_COMPILATION_CACHE

go.mod

@@ -12,7 +12,7 @@ require (
 	codeberg.org/gruf/go-debug v1.3.0
 	codeberg.org/gruf/go-errors/v2 v2.3.2
 	codeberg.org/gruf/go-fastcopy v1.1.3
-	codeberg.org/gruf/go-ffmpreg v0.3.1
+	codeberg.org/gruf/go-ffmpreg v0.4.2
 	codeberg.org/gruf/go-iotools v0.0.0-20240710125620-934ae9c654cf
 	codeberg.org/gruf/go-kv v1.6.5
 	codeberg.org/gruf/go-list v0.0.0-20240425093752-494db03d641f

go.sum

@@ -46,8 +46,8 @@ codeberg.org/gruf/go-fastcopy v1.1.3 h1:Jo9VTQjI6KYimlw25PPc7YLA3Xm+XMQhaHwKnM7x
 codeberg.org/gruf/go-fastcopy v1.1.3/go.mod h1:GDDYR0Cnb3U/AIfGM3983V/L+GN+vuwVMvrmVABo21s=
 codeberg.org/gruf/go-fastpath/v2 v2.0.0 h1:iAS9GZahFhyWEH0KLhFEJR+txx1ZhMXxYzu2q5Qo9c0=
 codeberg.org/gruf/go-fastpath/v2 v2.0.0/go.mod h1:3pPqu5nZjpbRrOqvLyAK7puS1OfEtQvjd6342Cwz56Q=
-codeberg.org/gruf/go-ffmpreg v0.3.1 h1:5qE6sHQbLCbQ4RO7ZL4OKZBN4ViAYfDm9ExT8N0ZE7s=
+codeberg.org/gruf/go-ffmpreg v0.4.2 h1:HKkPapm/PWkxsnUdjyQOGpwl5Qoa2EBrUQ09s4R4/FA=
-codeberg.org/gruf/go-ffmpreg v0.3.1/go.mod h1:Ar5nbt3tB2Wr0uoaqV3wDBNwAx+H+AB/mV7Kw7NlZTI=
+codeberg.org/gruf/go-ffmpreg v0.4.2/go.mod h1:Ar5nbt3tB2Wr0uoaqV3wDBNwAx+H+AB/mV7Kw7NlZTI=
 codeberg.org/gruf/go-iotools v0.0.0-20240710125620-934ae9c654cf h1:84s/ii8N6lYlskZjHH+DG6jyia8w2mXMZlRwFn8Gs3A=
 codeberg.org/gruf/go-iotools v0.0.0-20240710125620-934ae9c654cf/go.mod h1:zZAICsp5rY7+hxnws2V0ePrWxE0Z2Z/KXcN3p/RQCfk=
 codeberg.org/gruf/go-kv v1.6.5 h1:ttPf0NA8F79pDqBttSudPTVCZmGncumeNIxmeM9ztz0=

internal/media/ffmpeg/wasm.go

@@ -27,13 +27,8 @@ import (
 	ffprobelib "codeberg.org/gruf/go-ffmpreg/embed/ffprobe"
 	"codeberg.org/gruf/go-ffmpreg/wasm"
 	"github.com/tetratelabs/wazero"
-	"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
 )
 
-// Use all core features required by ffmpeg / ffprobe
-// (these should be the same but we OR just in case).
-const corefeatures = wasm.CoreFeatures
-
 var (
 	// shared WASM runtime instance.
 	runtime wazero.Runtime
@@ -91,38 +86,26 @@ func compileFfprobe(ctx context.Context) error {
 
 // initRuntime initializes the global wazero.Runtime,
 // if already initialized this function is a no-op.
-func initRuntime(ctx context.Context) error {
+func initRuntime(ctx context.Context) (err error) {
 	if runtime != nil {
 		return nil
 	}
 
-	var cache wazero.CompilationCache
+	// Create new runtime config.
+	cfg := wazero.NewRuntimeConfig()
 
 	if dir := os.Getenv("GTS_WAZERO_COMPILATION_CACHE"); dir != "" {
-		var err error
-
 		// Use on-filesystem compilation cache given by env.
-		cache, err = wazero.NewCompilationCacheWithDir(dir)
+		cache, err := wazero.NewCompilationCacheWithDir(dir)
 		if err != nil {
 			return err
 		}
+
+		// Update runtime config with cache.
+		cfg = cfg.WithCompilationCache(cache)
 	}
 
-	// Prepare config with cache.
+	// Initialize new runtime from config.
-	cfg := wazero.NewRuntimeConfig()
+	runtime, err = wasm.NewRuntime(ctx, cfg)
-	cfg = cfg.WithCoreFeatures(corefeatures)
+	return
-	cfg = cfg.WithCompilationCache(cache)
-
-	// Instantiate runtime with prepared config.
-	rt := wazero.NewRuntimeWithConfig(ctx, cfg)
-
-	// Instantiate wasi snapshot preview features into runtime.
-	_, err := wasi_snapshot_preview1.Instantiate(ctx, rt)
-	if err != nil {
-		return err
-	}
-
-	// Set runtime.
-	runtime = rt
-	return nil
 }

vendor/codeberg.org/gruf/go-ffmpreg/wasm/funcs.go

@@ -0,0 +1,74 @@
+package wasm
+
+import (
+	"context"
+
+	"github.com/tetratelabs/wazero/api"
+	"github.com/tetratelabs/wazero/experimental"
+)
+
+type snapshotskey struct{}
+
+// withSetjmpLongjmp updates the context to contain wazero/experimental.Snapshotter{} support,
+// and embeds the necessary snapshots map required for later calls to Setjmp() / Longjmp().
+func withSetjmpLongjmp(ctx context.Context) context.Context {
+	snapshots := make(map[uint32]experimental.Snapshot, 10)
+	ctx = experimental.WithSnapshotter(ctx)
+	ctx = context.WithValue(ctx, snapshotskey{}, snapshots)
+	return ctx
+}
+
+func getSnapshots(ctx context.Context) map[uint32]experimental.Snapshot {
+	v, _ := ctx.Value(snapshotskey{}).(map[uint32]experimental.Snapshot)
+	return v
+}
+
+// setjmp implements the C function: setjmp(env jmp_buf)
+func setjmp(ctx context.Context, mod api.Module, stack []uint64) {
+
+	// Input arguments.
+	envptr := api.DecodeU32(stack[0])
+
+	// Take snapshot of current execution environment.
+	snapshotter := experimental.GetSnapshotter(ctx)
+	snapshot := snapshotter.Snapshot()
+
+	// Get stored snapshots map.
+	snapshots := getSnapshots(ctx)
+	if snapshots == nil {
+		panic("setjmp / longjmp not supported")
+	}
+
+	// Set latest snapshot in map.
+	snapshots[envptr] = snapshot
+
+	// Set return.
+	stack[0] = 0
+}
+
+// longjmp implements the C function: int longjmp(env jmp_buf, value int)
+func longjmp(ctx context.Context, mod api.Module, stack []uint64) {
+
+	// Input arguments.
+	envptr := api.DecodeU32(stack[0])
+	// val := stack[1]
+
+	// Get stored snapshots map.
+	snapshots := getSnapshots(ctx)
+	if snapshots == nil {
+		panic("setjmp / longjmp not supported")
+	}
+
+	// Get snapshot stored in map.
+	snapshot := snapshots[envptr]
+	if snapshot == nil {
+		panic("must first call setjmp")
+	}
+
+	// Set return.
+	stack[0] = 0
+
+	// Restore execution and
+	// return passed value arg.
+	snapshot.Restore(stack[1:])
+}

vendor/codeberg.org/gruf/go-ffmpreg/wasm/run.go

@@ -6,19 +6,9 @@ import (
 	"unsafe"
 
 	"github.com/tetratelabs/wazero"
-	"github.com/tetratelabs/wazero/api"
 	"github.com/tetratelabs/wazero/sys"
 )
 
-// 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
-
 // Args encompasses a common set of
 // configuration options often passed to
 // wazero.Runtime on module instantiation.
@@ -64,6 +54,9 @@ func Run(
 		modcfg = args.Config(modcfg)
 	}
 
+	// Enable setjmp longjmp.
+	ctx = withSetjmpLongjmp(ctx)
+
 	// Instantiate the module from precompiled wasm module data.
 	mod, err := runtime.InstantiateModule(ctx, module, modcfg)
 

vendor/codeberg.org/gruf/go-ffmpreg/wasm/runtime.go

@@ -0,0 +1,67 @@
+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
+}

vendor/modules.txt

@@ -24,7 +24,7 @@ codeberg.org/gruf/go-fastcopy
 # codeberg.org/gruf/go-fastpath/v2 v2.0.0
 ## explicit; go 1.14
 codeberg.org/gruf/go-fastpath/v2
-# codeberg.org/gruf/go-ffmpreg v0.3.1
+# codeberg.org/gruf/go-ffmpreg v0.4.2
 ## explicit; go 1.22.0
 codeberg.org/gruf/go-ffmpreg/embed/ffmpeg
 codeberg.org/gruf/go-ffmpreg/embed/ffprobe