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mpv/player/lua.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include <math.h>
#include "osdep/io.h"
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "talloc.h"
#include "common/common.h"
#include "options/m_property.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "options/m_option.h"
#include "input/input.h"
#include "options/path.h"
#include "bstr/bstr.h"
#include "osdep/timer.h"
#include "osdep/threads.h"
#include "sub/osd.h"
#include "core.h"
#include "command.h"
#include "client.h"
#include "libmpv/client.h"
// List of builtin modules and their contents as strings.
// All these are generated from player/lua/*.lua
static const char * const builtin_lua_scripts[][2] = {
{"mp.defaults",
# include "player/lua/defaults.inc"
},
{"mp.assdraw",
# include "player/lua/assdraw.inc"
},
{"mp.options",
# include "player/lua/options.inc"
},
{"@osc.lua",
# include "player/lua/osc.inc"
},
{0}
};
// Represents a loaded script. Each has its own Lua state.
struct script_ctx {
const char *name;
lua_State *state;
struct mp_log *log;
struct mpv_handle *client;
struct MPContext *mpctx;
int suspended;
};
static struct script_ctx *get_ctx(lua_State *L)
{
lua_getfield(L, LUA_REGISTRYINDEX, "ctx");
struct script_ctx *ctx = lua_touserdata(L, -1);
lua_pop(L, 1);
assert(ctx);
return ctx;
}
static struct MPContext *get_mpctx(lua_State *L)
{
return get_ctx(L)->mpctx;
}
static int wrap_cpcall(lua_State *L)
{
lua_CFunction fn = lua_touserdata(L, -1);
lua_pop(L, 1);
return fn(L);
}
// Call the given function fn under a Lua error handler (similar to lua_cpcall).
// Pass the given number of args from the Lua stack to fn.
// Returns 0 (and empty stack) on success.
// Returns LUA_ERR[RUN|MEM|ERR] otherwise, with the error value on the stack.
static int mp_cpcall(lua_State *L, lua_CFunction fn, int args)
{
// Don't use lua_pushcfunction() - it allocates memory on Lua 5.1.
// Instead, emulate C closures by making wrap_cpcall call fn.
lua_pushlightuserdata(L, fn); // args... fn
// Will always succeed if mp_lua_init() set it up correctly.
lua_getfield(L, LUA_REGISTRYINDEX, "wrap_cpcall"); // args... fn wrap_cpcall
lua_insert(L, -(args + 2)); // wrap_cpcall args... fn
return lua_pcall(L, args + 1, 0, 0);
}
static void report_error(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *err = lua_tostring(L, -1);
MP_WARN(ctx, "Error: %s\n", err ? err : "[unknown]");
lua_pop(L, 1);
}
// Check client API error code:
// if err >= 0, push "true" to the stack, and return 1
// if err < 0, push nil and then the error string to the stack, and return 2
static int check_error(lua_State *L, int err)
{
if (err >= 0) {
lua_pushboolean(L, 1);
return 1;
}
lua_pushnil(L);
lua_pushstring(L, mpv_error_string(err));
return 2;
}
static int run_event_loop(lua_State *L)
{
lua_getglobal(L, "mp_event_loop");
if (lua_isnil(L, -1))
luaL_error(L, "no event loop function\n");
lua_call(L, 0, 0);
return 0;
}
static void add_functions(struct script_ctx *ctx);
static int load_file(struct script_ctx *ctx, const char *fname)
{
int r = 0;
lua_State *L = ctx->state;
char *res_name = mp_get_user_path(NULL, ctx->mpctx->global, fname);
MP_VERBOSE(ctx, "loading file %s\n", res_name);
if (luaL_loadfile(L, res_name) || lua_pcall(L, 0, 0, 0)) {
report_error(L);
r = -1;
}
assert(lua_gettop(L) == 0);
talloc_free(res_name);
return r;
}
static int load_builtin(lua_State *L)
{
const char *name = luaL_checkstring(L, 1);
char dispname[80];
snprintf(dispname, sizeof(dispname), "@%s", name);
for (int n = 0; builtin_lua_scripts[n][0]; n++) {
if (strcmp(name, builtin_lua_scripts[n][0]) == 0) {
const char *script = builtin_lua_scripts[n][1];
if (luaL_loadbuffer(L, script, strlen(script), dispname))
lua_error(L);
lua_call(L, 0, 1);
return 1;
}
}
return 0;
}
// Execute "require " .. name
static bool require(lua_State *L, const char *name)
{
struct script_ctx *ctx = get_ctx(L);
MP_VERBOSE(ctx, "loading %s\n", name);
// Lazy, but better than calling the "require" function manually
char buf[80];
snprintf(buf, sizeof(buf), "require '%s'", name);
if (luaL_loadstring(L, buf) || lua_pcall(L, 0, 0, 0)) {
report_error(L);
return false;
}
return true;
}
// Push the table of a module. If it doesn't exist, it's created.
// The Lua script can call "require(module)" to "load" it.
static void push_module_table(lua_State *L, const char *module)
{
lua_getglobal(L, "package"); // package
lua_getfield(L, -1, "loaded"); // package loaded
lua_remove(L, -2); // loaded
lua_getfield(L, -1, module); // loaded module
if (lua_isnil(L, -1)) {
lua_pop(L, 1); // loaded
lua_newtable(L); // loaded module
lua_pushvalue(L, -1); // loaded module module
lua_setfield(L, -3, module); // loaded module
}
lua_remove(L, -2); // module
}
static int load_lua(struct mpv_handle *client, const char *fname)
{
struct MPContext *mpctx = mp_client_get_core(client);
int r = -1;
struct script_ctx *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct script_ctx) {
.mpctx = mpctx,
.client = client,
.name = mpv_client_name(client),
.log = mp_client_get_log(client),
};
lua_State *L = ctx->state = luaL_newstate();
if (!L)
goto error_out;
// used by get_ctx()
lua_pushlightuserdata(L, ctx); // ctx
lua_setfield(L, LUA_REGISTRYINDEX, "ctx"); // -
lua_pushcfunction(L, wrap_cpcall); // closure
lua_setfield(L, LUA_REGISTRYINDEX, "wrap_cpcall"); // -
luaL_openlibs(L);
add_functions(ctx); // mp
push_module_table(L, "mp"); // mp
// "mp" is available by default, and no "require 'mp'" is needed
lua_pushvalue(L, -1); // mp mp
lua_setglobal(L, "mp"); // mp
lua_pushstring(L, ctx->name); // mp name
lua_setfield(L, -2, "script_name"); // mp
// used by pushnode()
lua_newtable(L); // mp table
lua_pushvalue(L, -1); // mp table table
lua_setfield(L, LUA_REGISTRYINDEX, "UNKNOWN_TYPE"); // mp table
lua_setfield(L, -2, "UNKNOWN_TYPE"); // mp
lua_newtable(L); // mp table
lua_pushvalue(L, -1); // mp table table
lua_setfield(L, LUA_REGISTRYINDEX, "MAP"); // mp table
lua_setfield(L, -2, "MAP"); // mp
lua_newtable(L); // mp table
lua_pushvalue(L, -1); // mp table table
lua_setfield(L, LUA_REGISTRYINDEX, "ARRAY"); // mp table
lua_setfield(L, -2, "ARRAY"); // mp
lua_pop(L, 1); // -
assert(lua_gettop(L) == 0);
// Add a preloader for each builtin Lua module
lua_getglobal(L, "package"); // package
assert(lua_type(L, -1) == LUA_TTABLE);
lua_getfield(L, -1, "preload"); // package preload
assert(lua_type(L, -1) == LUA_TTABLE);
for (int n = 0; builtin_lua_scripts[n][0]; n++) {
lua_pushcfunction(L, load_builtin); // package preload load_builtin
lua_setfield(L, -2, builtin_lua_scripts[n][0]);
}
lua_pop(L, 2); // -
assert(lua_gettop(L) == 0);
if (!require(L, "mp.defaults")) {
report_error(L);
goto error_out;
}
assert(lua_gettop(L) == 0);
if (fname[0] == '@') {
if (!require(L, fname))
goto error_out;
} else {
if (load_file(ctx, fname) < 0)
goto error_out;
}
// Call the script's event loop runs until the script terminates and unloads.
if (mp_cpcall(L, run_event_loop, 0) != 0)
report_error(L);
r = 0;
error_out:
if (ctx->suspended)
mpv_resume(ctx->client);
if (ctx->state)
lua_close(ctx->state);
talloc_free(ctx);
return r;
}
static int check_loglevel(lua_State *L, int arg)
{
const char *level = luaL_checkstring(L, arg);
for (int n = 0; n < MSGL_MAX; n++) {
if (mp_log_levels[n] && strcasecmp(mp_log_levels[n], level) == 0)
return n;
}
luaL_error(L, "Invalid log level '%s'", level);
abort();
}
static int script_log(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
int msgl = check_loglevel(L, 1);
int last = lua_gettop(L);
lua_getglobal(L, "tostring"); // args... tostring
for (int i = 2; i <= last; i++) {
lua_pushvalue(L, -1); // args... tostring tostring
lua_pushvalue(L, i); // args... tostring tostring args[i]
lua_call(L, 1, 1); // args... tostring str
const char *s = lua_tostring(L, -1);
if (s == NULL)
return luaL_error(L, "Invalid argument");
mp_msg(ctx->log, msgl, "%s%s", s, i > 0 ? " " : "");
lua_pop(L, 1); // args... tostring
}
mp_msg(ctx->log, msgl, "\n");
return 0;
}
static int script_find_config_file(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
const char *s = luaL_checkstring(L, 1);
char *path = mp_find_user_config_file(NULL, mpctx->global, s);
if (path) {
lua_pushstring(L, path);
} else {
lua_pushnil(L);
}
talloc_free(path);
return 1;
}
static int script_suspend(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
if (!ctx->suspended)
mpv_suspend(ctx->client);
ctx->suspended++;
return 0;
}
static int script_resume(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
if (ctx->suspended < 1)
luaL_error(L, "trying to resume, but core is not suspended");
ctx->suspended--;
if (!ctx->suspended)
mpv_resume(ctx->client);
return 0;
}
static int script_resume_all(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
if (ctx->suspended)
mpv_resume(ctx->client);
ctx->suspended = 0;
return 0;
}
static bool pushnode(lua_State *L, mpv_node *node, int depth);
static int script_wait_event(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
double timeout = luaL_optnumber(L, 1, 1e20);
// This will almost surely lead to a deadlock. (Polling is still ok.)
if (ctx->suspended && timeout > 0)
luaL_error(L, "attempting to wait while core is suspended");
mpv_event *event = mpv_wait_event(ctx->client, timeout);
lua_newtable(L); // event
lua_pushstring(L, mpv_event_name(event->event_id)); // event name
lua_setfield(L, -2, "event"); // event
if (event->reply_userdata) {
lua_pushnumber(L, event->reply_userdata);
lua_setfield(L, -2, "id");
}
if (event->error < 0) {
lua_pushstring(L, mpv_error_string(event->error)); // event err
lua_setfield(L, -2, "error"); // event
}
switch (event->event_id) {
case MPV_EVENT_LOG_MESSAGE: {
mpv_event_log_message *msg = event->data;
lua_pushstring(L, msg->prefix); // event s
lua_setfield(L, -2, "prefix"); // event
lua_pushstring(L, msg->level); // event s
lua_setfield(L, -2, "level"); // event
lua_pushstring(L, msg->text); // event s
lua_setfield(L, -2, "text"); // event
break;
}
case MPV_EVENT_SCRIPT_INPUT_DISPATCH: {
mpv_event_script_input_dispatch *msg = event->data;
lua_pushinteger(L, msg->arg0); // event i
lua_setfield(L, -2, "arg0"); // event
lua_pushstring(L, msg->type); // event s
lua_setfield(L, -2, "type"); // event
break;
}
case MPV_EVENT_CLIENT_MESSAGE: {
mpv_event_client_message *msg = event->data;
lua_newtable(L); // event args
for (int n = 0; n < msg->num_args; n++) {
lua_pushinteger(L, n + 1); // event args N
lua_pushstring(L, msg->args[n]); // event args N val
lua_settable(L, -3); // event args
}
lua_setfield(L, -2, "args"); // event
break;
}
case MPV_EVENT_PROPERTY_CHANGE: {
mpv_event_property *prop = event->data;
lua_pushstring(L, prop->name);
lua_setfield(L, -2, "name");
switch (prop->format) {
case MPV_FORMAT_NODE:
if (!pushnode(L, prop->data, 50))
luaL_error(L, "stack overflow");
break;
case MPV_FORMAT_DOUBLE:
lua_pushnumber(L, *(double *)prop->data);
break;
case MPV_FORMAT_FLAG:
lua_pushboolean(L, *(int *)prop->data);
break;
case MPV_FORMAT_STRING:
lua_pushstring(L, *(char **)prop->data);
break;
default:
lua_pushnil(L);
}
lua_setfield(L, -2, "data");
break;
}
default: ;
}
// return event
return 1;
}
static int script_request_event(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *event = luaL_checkstring(L, 1);
bool enable = lua_toboolean(L, 2);
// brute force event name -> id; stops working for events > assumed max
int event_id = -1;
for (int n = 0; n < 256; n++) {
const char *name = mpv_event_name(n);
if (name && strcmp(name, event) == 0) {
event_id = n;
break;
}
}
lua_pushboolean(L, mpv_request_event(ctx->client, event_id, enable) >= 0);
return 1;
}
static int script_enable_messages(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
check_loglevel(L, 1);
const char *level = luaL_checkstring(L, 1);
return check_error(L, mpv_request_log_messages(ctx->client, level));
}
static int script_command(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *s = luaL_checkstring(L, 1);
return check_error(L, mpv_command_string(ctx->client, s));
}
static int script_commandv(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
int num = lua_gettop(L);
const char *args[50];
if (num + 1 > MP_ARRAY_SIZE(args))
luaL_error(L, "too many arguments");
for (int n = 1; n <= num; n++) {
const char *s = lua_tostring(L, n);
if (!s)
luaL_error(L, "argument %d is not a string", n);
args[n - 1] = s;
}
args[num] = NULL;
return check_error(L, mpv_command(ctx->client, args));
}
static int script_set_property(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
const char *v = luaL_checkstring(L, 2);
return check_error(L, mpv_set_property_string(ctx->client, p, v));
}
static int script_set_property_bool(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
int v = lua_toboolean(L, 2);
return check_error(L, mpv_set_property(ctx->client, p, MPV_FORMAT_FLAG, &v));
}
static bool is_int(double d)
{
int64_t v = d;
return d == (double)v;
}
static int script_set_property_number(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
double d = luaL_checknumber(L, 2);
// If the number might be an integer, then set it as integer. The mpv core
// will (probably) convert INT64 to DOUBLE when setting, but not the other
// way around.
int res;
if (is_int(d)) {
res = mpv_set_property(ctx->client, p, MPV_FORMAT_INT64, &(int64_t){d});
} else {
res = mpv_set_property(ctx->client, p, MPV_FORMAT_DOUBLE, &d);
}
return check_error(L, res);
}
static void makenode(void *tmp, mpv_node *dst, lua_State *L, int t)
{
if (t < 0)
t = lua_gettop(L) + (t + 1);
switch (lua_type(L, t)) {
case LUA_TNIL:
dst->format = MPV_FORMAT_NONE;
break;
case LUA_TNUMBER: {
double d = lua_tonumber(L, t);
if (is_int(d)) {
dst->format = MPV_FORMAT_INT64;
dst->u.int64 = d;
} else {
dst->format = MPV_FORMAT_DOUBLE;
dst->u.double_ = d;
}
break;
}
case LUA_TBOOLEAN:
dst->format = MPV_FORMAT_FLAG;
dst->u.flag = !!lua_toboolean(L, t);
break;
case LUA_TSTRING:
dst->format = MPV_FORMAT_STRING;
dst->u.string = talloc_strdup(tmp, lua_tostring(L, t));
break;
case LUA_TTABLE: {
// Lua uses the same type for arrays and maps, so guess the correct one.
int format = MPV_FORMAT_NONE;
if (lua_getmetatable(L, t)) { // mt
lua_getfield(L, -1, "type"); // mt val
if (lua_type(L, -1) == LUA_TSTRING) {
const char *type = lua_tostring(L, -1);
if (strcmp(type, "MAP") == 0) {
format = MPV_FORMAT_NODE_MAP;
} else if (strcmp(type, "ARRAY") == 0) {
format = MPV_FORMAT_NODE_ARRAY;
}
}
lua_pop(L, 2);
}
if (format == MPV_FORMAT_NONE) {
// If all keys are integers, and they're in sequence, take it
// as an array.
int count = 0;
for (int n = 1; ; n++) {
lua_pushinteger(L, n); // n
lua_gettable(L, t); // t[n]
bool empty = lua_isnil(L, -1); // t[n]
lua_pop(L, 1); // -
if (empty) {
count = n;
break;
}
}
if (count > 0)
format = MPV_FORMAT_NODE_ARRAY;
lua_pushnil(L); // nil
while (lua_next(L, t) != 0) { // key value
count--;
lua_pop(L, 1); // key
if (count < 0) {
lua_pop(L, 1); // -
format = MPV_FORMAT_NODE_MAP;
break;
}
}
}
if (format == MPV_FORMAT_NONE)
format = MPV_FORMAT_NODE_ARRAY; // probably empty table; assume array
mpv_node_list *list = talloc_zero(tmp, mpv_node_list);
dst->format = format;
dst->u.list = list;
if (format == MPV_FORMAT_NODE_ARRAY) {
for (int n = 0; ; n++) {
lua_pushinteger(L, n + 1); // n1
lua_gettable(L, t); // t[n1]
if (lua_isnil(L, -1))
break;
MP_TARRAY_GROW(tmp, list->values, list->num);
makenode(tmp, &list->values[n], L, -1);
list->num++;
lua_pop(L, 1); // -
}
lua_pop(L, 1); // -
} else {
lua_pushnil(L); // nil
while (lua_next(L, t) != 0) { // key value
MP_TARRAY_GROW(tmp, list->values, list->num);
MP_TARRAY_GROW(tmp, list->keys, list->num);
makenode(tmp, &list->values[list->num], L, -1);
if (lua_type(L, -2) != LUA_TSTRING) {
talloc_free(tmp);
luaL_error(L, "key must be a string, but got %s",
lua_typename(L, -2));
}
list->keys[list->num] = talloc_strdup(tmp, lua_tostring(L, -2));
list->num++;
lua_pop(L, 1); // key
}
}
break;
}
default:
// unknown type
talloc_free(tmp);
luaL_error(L, "disallowed Lua type found: %s\n", lua_typename(L, t));
}
}
static int script_set_property_native(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
struct mpv_node node;
void *tmp = talloc_new(NULL);
makenode(tmp, &node, L, 2);
int res = mpv_set_property(ctx->client, p, MPV_FORMAT_NODE, &node);
talloc_free(tmp);
return check_error(L, res);
}
static int script_property_list(lua_State *L)
{
const struct m_option *props = mp_get_property_list();
lua_newtable(L);
for (int i = 0; props[i].name; i++) {
lua_pushinteger(L, i + 1);
lua_pushstring(L, props[i].name);
lua_settable(L, -3);
}
return 1;
}
static int script_get_property(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
int type = lua_tointeger(L, lua_upvalueindex(1))
? MPV_FORMAT_OSD_STRING : MPV_FORMAT_STRING;
char *result = NULL;
int err = mpv_get_property(ctx->client, name, type, &result);
if (err >= 0) {
lua_pushstring(L, result);
talloc_free(result);
return 1;
} else {
if (lua_isnoneornil(L, 2) && type == MPV_FORMAT_OSD_STRING) {
lua_pushstring(L, "");
} else {
lua_pushvalue(L, 2);
}
lua_pushstring(L, mpv_error_string(err));
return 2;
}
}
static int script_get_property_bool(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
int result = 0;
int err = mpv_get_property(ctx->client, name, MPV_FORMAT_FLAG, &result);
if (err >= 0) {
lua_pushboolean(L, !!result);
return 1;
} else {
lua_pushvalue(L, 2);
lua_pushstring(L, mpv_error_string(err));
return 2;
}
}
static int script_get_property_number(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
// Note: the mpv core will (hopefully) convert INT64 to DOUBLE
double result = 0;
int err = mpv_get_property(ctx->client, name, MPV_FORMAT_DOUBLE, &result);
if (err >= 0) {
lua_pushnumber(L, result);
return 1;
} else {
lua_pushvalue(L, 2);
lua_pushstring(L, mpv_error_string(err));
return 2;
}
}
static bool pushnode(lua_State *L, mpv_node *node, int depth)
{
depth--;
if (depth < 0)
return false;
luaL_checkstack(L, 6, "stack overflow");
switch (node->format) {
case MPV_FORMAT_STRING:
lua_pushstring(L, node->u.string);
break;
case MPV_FORMAT_INT64:
lua_pushnumber(L, node->u.int64);
break;
case MPV_FORMAT_DOUBLE:
lua_pushnumber(L, node->u.double_);
break;
case MPV_FORMAT_NONE:
lua_pushnil(L);
break;
case MPV_FORMAT_FLAG:
lua_pushboolean(L, node->u.flag);
break;
case MPV_FORMAT_NODE_ARRAY:
lua_newtable(L); // table
lua_getfield(L, LUA_REGISTRYINDEX, "ARRAY"); // table mt
lua_setmetatable(L, -2); // table
for (int n = 0; n < node->u.list->num; n++) {
if (!pushnode(L, &node->u.list->values[n], depth)) // table value
return false;
lua_rawseti(L, -2, n + 1); // table
}
break;
case MPV_FORMAT_NODE_MAP:
lua_newtable(L); // table
lua_getfield(L, LUA_REGISTRYINDEX, "MAP"); // table mt
lua_setmetatable(L, -2); // table
for (int n = 0; n < node->u.list->num; n++) {
lua_pushstring(L, node->u.list->keys[n]); // table key
if (!pushnode(L, &node->u.list->values[n], depth)) // table key value
return false;
lua_rawset(L, -3);
}
break;
default:
// unknown value - what do we do?
// for now, set a unique dummy value
lua_newtable(L); // table
lua_getfield(L, LUA_REGISTRYINDEX, "UNKNOWN_TYPE");
lua_setmetatable(L, -2); // table
break;
}
return true;
}
static int script_get_property_native(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
mpv_node node;
int err = mpv_get_property(ctx->client, name, MPV_FORMAT_NODE, &node);
const char *errstr = mpv_error_string(err);
if (err >= 0) {
bool ok = pushnode(L, &node, 50);
mpv_free_node_contents(&node);
if (ok)
return 1;
errstr = "value too large";
}
lua_pushvalue(L, 2);
lua_pushstring(L, errstr);
return 2;
}
static mpv_format check_property_format(lua_State *L, int arg)
{
if (lua_isnil(L, arg))
return MPV_FORMAT_NONE;
const char *fmts[] = {"none", "native", "bool", "string", "number", NULL};
switch (luaL_checkoption(L, arg, "none", fmts)) {
case 0: return MPV_FORMAT_NONE;
case 1: return MPV_FORMAT_NODE;
case 2: return MPV_FORMAT_FLAG;
case 3: return MPV_FORMAT_STRING;
case 4: return MPV_FORMAT_DOUBLE;
}
abort();
}
// It has a raw_ prefix, because there is a more high level API in defaults.lua.
static int script_raw_observe_property(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
uint64_t id = luaL_checknumber(L, 1);
const char *name = luaL_checkstring(L, 2);
mpv_format format = check_property_format(L, 3);
return check_error(L, mpv_observe_property(ctx->client, id, name, format));
}
static int script_raw_unobserve_property(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
uint64_t id = luaL_checknumber(L, 1);
lua_pushnumber(L, mpv_unobserve_property(ctx->client, id));
return 1;
}
static int script_set_osd_ass(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
int res_x = luaL_checkinteger(L, 1);
int res_y = luaL_checkinteger(L, 2);
const char *text = luaL_checkstring(L, 3);
osd_set_external(mpctx->osd, res_x, res_y, (char *)text);
return 0;
}
static int script_get_osd_resolution(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
int w, h;
osd_object_get_resolution(mpctx->osd, OSDTYPE_EXTERNAL, &w, &h);
lua_pushnumber(L, w);
lua_pushnumber(L, h);
return 2;
}
static int script_get_screen_size(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
struct mp_osd_res vo_res = osd_get_vo_res(mpctx->osd, OSDTYPE_EXTERNAL);
double aspect = 1.0 * vo_res.w / MPMAX(vo_res.h, 1) /
vo_res.display_par;
lua_pushnumber(L, vo_res.w);
lua_pushnumber(L, vo_res.h);
lua_pushnumber(L, aspect);
return 3;
}
static int script_get_mouse_pos(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
int px, py;
mp_input_get_mouse_pos(mpctx->input, &px, &py);
double sw, sh;
osd_object_get_scale_factor(mpctx->osd, OSDTYPE_EXTERNAL, &sw, &sh);
lua_pushnumber(L, px * sw);
lua_pushnumber(L, py * sh);
return 2;
}
static int script_get_time(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
lua_pushnumber(L, mpv_get_time_us(ctx->client) / (double)(1000 * 1000));
return 1;
}
static int script_input_define_section(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
char *section = (char *)luaL_checkstring(L, 1);
char *contents = (char *)luaL_checkstring(L, 2);
char *flags = (char *)luaL_optstring(L, 3, "");
bool builtin = true;
if (strcmp(flags, "default") == 0) {
builtin = true;
} else if (strcmp(flags, "force") == 0) {
builtin = false;
} else if (strcmp(flags, "") == 0) {
//pass
} else {
luaL_error(L, "invalid flags: '%s'", flags);
}
mp_input_define_section(mpctx->input, section, "<script>", contents, builtin);
return 0;
}
static int script_input_enable_section(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
char *section = (char *)luaL_checkstring(L, 1);
char *sflags = (char *)luaL_optstring(L, 2, "");
bstr bflags = bstr0(sflags);
int flags = 0;
while (bflags.len) {
bstr val;
bstr_split_tok(bflags, "|", &val, &bflags);
if (bstr_equals0(val, "allow-hide-cursor")) {
flags |= MP_INPUT_ALLOW_HIDE_CURSOR;
} else if (bstr_equals0(val, "allow-vo-dragging")) {
flags |= MP_INPUT_ALLOW_VO_DRAGGING;
} else if (bstr_equals0(val, "exclusive")) {
flags |= MP_INPUT_EXCLUSIVE;
} else {
luaL_error(L, "invalid flag: '%.*s'", BSTR_P(val));
}
}
mp_input_enable_section(mpctx->input, section, flags);
return 0;
}
static int script_input_disable_section(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
char *section = (char *)luaL_checkstring(L, 1);
mp_input_disable_section(mpctx->input, section);
return 0;
}
static int script_input_set_section_mouse_area(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
double sw, sh;
osd_object_get_scale_factor(mpctx->osd, OSDTYPE_EXTERNAL, &sw, &sh);
char *section = (char *)luaL_checkstring(L, 1);
int x0 = luaL_checkinteger(L, 2) / sw;
int y0 = luaL_checkinteger(L, 3) / sh;
int x1 = luaL_checkinteger(L, 4) / sw;
int y1 = luaL_checkinteger(L, 5) / sh;
mp_input_set_section_mouse_area(mpctx->input, section, x0, y0, x1, y1);
return 0;
}
static int script_format_time(lua_State *L)
{
double t = luaL_checknumber(L, 1);
const char *fmt = luaL_optstring(L, 2, "%H:%M:%S");
char *r = mp_format_time_fmt(fmt, t);
if (!r)
luaL_error(L, "Invalid time format string '%s'", fmt);
lua_pushstring(L, r);
talloc_free(r);
return 1;
}
static int script_get_wakeup_pipe(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
lua_pushinteger(L, mpv_get_wakeup_pipe(ctx->client));
return 1;
}
static int script_readdir(lua_State *L)
{
// 0 1 2 3
const char *fmts[] = {"all", "files", "dirs", "normal", NULL};
const char *path = luaL_checkstring(L, 1);
int t = luaL_checkoption(L, 2, "normal", fmts);
DIR *dir = opendir(path);
if (!dir) {
lua_pushnil(L);
lua_pushstring(L, "error");
return 2;
}
lua_newtable(L); // list
char *fullpath = NULL;
struct dirent *e;
int n = 0;
while ((e = readdir(dir))) {
char *name = e->d_name;
if (t) {
if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
continue;
if (fullpath)
fullpath[0] = '\0';
fullpath = talloc_asprintf_append(fullpath, "%s/%s", path, name);
struct stat st;
if (mp_stat(fullpath, &st))
continue;
if (!(((t & 1) && S_ISREG(st.st_mode)) ||
((t & 2) && S_ISDIR(st.st_mode))))
continue;
}
lua_pushinteger(L, ++n); // list index
lua_pushstring(L, name); // list index name
lua_settable(L, -3); // list
}
talloc_free(fullpath);
return 1;
}
static int script_split_path(lua_State *L)
{
const char *p = luaL_checkstring(L, 1);
bstr fname = mp_dirname(p);
lua_pushlstring(L, fname.start, fname.len);
lua_pushstring(L, mp_basename(p));
return 2;
}
static int script_join_path(lua_State *L)
{
const char *p1 = luaL_checkstring(L, 1);
const char *p2 = luaL_checkstring(L, 2);
char *r = mp_path_join(NULL, bstr0(p1), bstr0(p2));
lua_pushstring(L, r);
talloc_free(r);
return 1;
}
#define FN_ENTRY(name) {#name, script_ ## name}
struct fn_entry {
const char *name;
int (*fn)(lua_State *L);
};
static const struct fn_entry main_fns[] = {
FN_ENTRY(log),
FN_ENTRY(suspend),
FN_ENTRY(resume),
FN_ENTRY(resume_all),
FN_ENTRY(wait_event),
FN_ENTRY(request_event),
FN_ENTRY(find_config_file),
FN_ENTRY(command),
FN_ENTRY(commandv),
FN_ENTRY(get_property_bool),
FN_ENTRY(get_property_number),
FN_ENTRY(get_property_native),
FN_ENTRY(set_property),
FN_ENTRY(set_property_bool),
FN_ENTRY(set_property_number),
FN_ENTRY(set_property_native),
FN_ENTRY(raw_observe_property),
FN_ENTRY(raw_unobserve_property),
FN_ENTRY(property_list),
FN_ENTRY(set_osd_ass),
FN_ENTRY(get_osd_resolution),
FN_ENTRY(get_screen_size),
FN_ENTRY(get_mouse_pos),
FN_ENTRY(get_time),
FN_ENTRY(input_define_section),
FN_ENTRY(input_enable_section),
FN_ENTRY(input_disable_section),
FN_ENTRY(input_set_section_mouse_area),
FN_ENTRY(format_time),
FN_ENTRY(enable_messages),
FN_ENTRY(get_wakeup_pipe),
{0}
};
static const struct fn_entry utils_fns[] = {
FN_ENTRY(readdir),
FN_ENTRY(split_path),
FN_ENTRY(join_path),
{0}
};
static void register_package_fns(lua_State *L, char *module,
const struct fn_entry *e)
{
push_module_table(L, module); // modtable
for (int n = 0; e[n].name; n++) {
lua_pushcclosure(L, e[n].fn, 0); // modtable fn
lua_setfield(L, -2, e[n].name); // modtable
}
lua_pop(L, 1); // -
}
static void add_functions(struct script_ctx *ctx)
{
lua_State *L = ctx->state;
register_package_fns(L, "mp", main_fns);
push_module_table(L, "mp"); // mp
lua_pushinteger(L, 0);
lua_pushcclosure(L, script_get_property, 1);
lua_setfield(L, -2, "get_property");
lua_pushinteger(L, 1);
lua_pushcclosure(L, script_get_property, 1);
lua_setfield(L, -2, "get_property_osd");
lua_pop(L, 1); // -
register_package_fns(L, "mp.utils", utils_fns);
}
const struct mp_scripting mp_scripting_lua = {
.file_ext = "lua",
.load = load_lua,
};
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