Function Validate

src/command/audio.cpp:121–123

	CMD_TYPE(COMMAND_VALIDATE)

	bool Validate(const agi::Context *c) override {
		return c->project->VideoProvider() && c->project->VideoProvider()->HasAudio();
	}

	void operator()(agi::Context *c) override {
		c->project->LoadAudio(c->project->VideoName());