libmpv/simple/simple.c rewritten in Go

simple.go

package main

/*
#include <stdlib.h>
#include <mpv/client.h>
#cgo pkg-config: mpv

const char* INPUT_DEFAULT_BINDING = "input-default-bindings";
const char* INPUT_VO_KEYBOARD = "input-vo-keyboard";
const char* YES = "yes";
const char* OSC = "osc";
const char* LOADFILE = "loadfile";
*/
import "C"
import (
	"fmt"
	"log"
	"os"
	"unsafe"
)

func main() {
	if len(os.Args) != 2 {
		log.Fatalln("pass a single media file as argument")
	}

	ctx := C.mpv_create()
	if ctx == nil {
		log.Fatalln("failed creating context")
	}

	// Enable default key bindings, so the user can actually interact with
	// the player (and e.g. close the window).
	checkError(C.mpv_set_option_string(ctx, C.INPUT_DEFAULT_BINDING, C.YES))
	C.mpv_set_option_string(ctx, C.INPUT_VO_KEYBOARD, C.YES)
	var val C.int = 1
	checkError(C.mpv_set_option(ctx, C.OSC, C.MPV_FORMAT_FLAG, unsafe.Pointer(&val)))

	// Done setting up options.
	checkError(C.mpv_initialize(ctx))

	// Play this file.
	filename := C.CString(os.Args[1])
	cmd := [3]*C.char{C.LOADFILE, filename, nil}
	checkError(C.mpv_command(ctx, &cmd[0]))
	C.free(unsafe.Pointer(filename))

	// Let it play, and wait until the user quits.
	for {
		event := C.mpv_wait_event(ctx, 10000)
		fmt.Printf("event: %s\n", C.GoString(C.mpv_event_name(event.event_id)))
		if event.event_id == C.MPV_EVENT_SHUTDOWN {
			break
		}
	}

	C.mpv_terminate_destroy(ctx)
}

func checkError(status C.int) {
	if status < 0 {
		log.Fatalf("mpv API error: %s\n", C.GoString(C.mpv_error_string(status)))
	}
}