mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-31 02:22:26 -05:00
b84637801a* pull in go-ffmpreg v0.6.0 * add code comment * grrr linter * set empty module name when calling ffmpeg / ffprobe
118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//go:build !nowasm
|
|
|
|
package ffmpeg
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"sync/atomic"
|
|
"unsafe"
|
|
|
|
"codeberg.org/gruf/go-ffmpreg/embed"
|
|
"codeberg.org/gruf/go-ffmpreg/wasm"
|
|
"github.com/tetratelabs/wazero"
|
|
)
|
|
|
|
// ffmpreg is a concurrency-safe pointer
|
|
// to our necessary WebAssembly runtime
|
|
// and compiled ffmpreg module instance.
|
|
var ffmpreg atomic.Pointer[struct {
|
|
run wazero.Runtime
|
|
mod wazero.CompiledModule
|
|
}]
|
|
|
|
// initWASM safely prepares new WebAssembly runtime
|
|
// and compiles ffmpreg module instance, if the global
|
|
// pointer has not been already. else, is a no-op.
|
|
func initWASM(ctx context.Context) error {
|
|
if ffmpreg.Load() != nil {
|
|
return nil
|
|
}
|
|
|
|
// Create new runtime config.
|
|
cfg := wazero.NewRuntimeConfig()
|
|
|
|
if dir := os.Getenv("GTS_WAZERO_COMPILATION_CACHE"); dir != "" {
|
|
// Use on-filesystem compilation cache given by env.
|
|
cache, err := wazero.NewCompilationCacheWithDir(dir)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Update runtime config with cache.
|
|
cfg = cfg.WithCompilationCache(cache)
|
|
}
|
|
|
|
var (
|
|
run wazero.Runtime
|
|
mod wazero.CompiledModule
|
|
err error
|
|
set bool
|
|
)
|
|
|
|
defer func() {
|
|
if err == nil && set {
|
|
// Drop binary.
|
|
embed.B = nil
|
|
return
|
|
}
|
|
|
|
// Close module.
|
|
if !isNil(mod) {
|
|
mod.Close(ctx)
|
|
}
|
|
|
|
// Close runtime.
|
|
if !isNil(run) {
|
|
run.Close(ctx)
|
|
}
|
|
}()
|
|
|
|
// Initialize new runtime from config.
|
|
run, err = wasm.NewRuntime(ctx, cfg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Compile ffmpreg WebAssembly into memory.
|
|
mod, err = run.CompileModule(ctx, embed.B)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Try set global WASM runtime and module,
|
|
// or if beaten to it defer will handle close.
|
|
set = ffmpreg.CompareAndSwap(nil, &struct {
|
|
run wazero.Runtime
|
|
mod wazero.CompiledModule
|
|
}{
|
|
run: run,
|
|
mod: mod,
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
// isNil will safely check if 'v' is nil without
|
|
// dealing with weird Go interface nil bullshit.
|
|
func isNil(i interface{}) bool {
|
|
type eface struct{ Type, Data unsafe.Pointer }
|
|
return (*eface)(unsafe.Pointer(&i)).Data == nil
|
|
}
|