How do you load MPV Lua scripts with the C Plugin? - c++

Question

After realizing it is nearly impossible to find help on getting keybindings to work with the C plugin in MPV (Possible to allow key bindings with MPV C API when no video (GUI) is being shown?), I decided to learn some Lua to help with the cause. Problem is, the docs aren't very clear on how to add Lua scripts with the C plugin, what I could find out was that check_error(mpv_set_option_string(ctx, "load-scripts", "yes")); should be called before initializing mpv in the C plugin, which points out that there should be a way to add scripts... When loading a script in the terminal you can do mpv video.mp4 --scripts="script_name.lua" and that will call the script from inside $HOME/.config/mpv... How do I achieve the calling of Lua scripts in the C plugin for MPV? I tried a few things including check_error(mpv_set_option_string(ctx, "scripts", "test.lua")); and check_error(mpv_set_property_string(ctx, "scripts", "test.lua")); and const char *cmd2[] = {"scripts", "test.lua", NULL}; check_error(mpv_command(ctx, cmd2));, none of which worked...
How do I call a Lua script for MPV from the C Plugin?
Below is the code I'm using to test things out:
// Build with: g++ main.cpp -o output `pkg-config --libs --cflags mpv`
#include <iostream>
#include <mpv/client.h>
static inline void check_error(int status)
{
if (status < 0)
{
std::cout << "mpv API error: " << mpv_error_string(status) << std::endl;
exit(1);
}
}
int main(int argc, char *argv[])
{
if (argc != 2)
{
std::cout << "pass a single media file as argument" << std::endl;
return 1;
}
mpv_handle *ctx = mpv_create();
if (!ctx)
{
std::cout << "failed creating context" << std::endl;
return 1;
}
// Enable default key bindings, so the user can actually interact with
// the player (and e.g. close the window).
check_error(mpv_set_option_string(ctx, "input-default-bindings", "yes"));
mpv_set_option_string(ctx, "input-vo-keyboard", "yes");
check_error(mpv_set_option_string(ctx, "load-scripts", "yes"));
check_error(mpv_set_option_string(ctx, "scripts", "test.lua")); // DOES NOT WORK :(
int val = 1;
check_error(mpv_set_option(ctx, "osc", MPV_FORMAT_FLAG, &val));
// Done setting up options.
check_error(mpv_initialize(ctx));
// Play the file passed in as a parameter when executing program.
const char *cmd[] = {"loadfile", argv[1], NULL};
check_error(mpv_command(ctx, cmd));
// check_error(mpv_set_option_string(ctx, "scripts", "test.lua"));
check_error(mpv_set_option_string(ctx, "shuffle", "yes")); // shuffle videos
check_error(mpv_set_option_string(ctx, "loop-playlist", "yes")); // loop playlists
// check_error(mpv_set_option_string(ctx, "aspect", "0:0")); // set aspect
// Let it play, and wait until the user quits.
while (1)
{
mpv_event *event = mpv_wait_event(ctx, 10000);
std::cout << "event: " << mpv_event_name(event->event_id) << std::endl;
if (event->event_id == MPV_EVENT_SHUTDOWN)
break;
}
mpv_terminate_destroy(ctx);
return 0;
}

Answer 1

After playing around more with the mpv_set_property_string command, I discovered that you have to specify the FULL path to the Lua file, it by defaults searches for the file in the directory it is being played in, so if I tried to play it in /home/ it will search for /home/test.lua, so to get it to work I had to do check_error(mpv_set_property_string(ctx, "scripts", "/home/netsu/.config/mpv/test.lua")); (give the absolute path)