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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 Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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 <math.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "osdep/io.h"
#include "mpv_talloc.h"
#include "common/common.h"
#include "options/m_property.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "common/stats.h"
#include "options/m_option.h"
#include "input/input.h"
#include "options/path.h"
#include "misc/bstr.h"
#include "misc/json.h"
#include "osdep/subprocess.h"
#include "osdep/timer.h"
#include "osdep/threads.h"
#include "stream/stream.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.lua.inc"
},
{"mp.assdraw",
# include "player/lua/assdraw.lua.inc"
},
{"mp.fzy",
# include "player/lua/fzy.lua.inc"
},
{"mp.input",
# include "player/lua/input.lua.inc"
},
{"mp.options",
# include "player/lua/options.lua.inc"
},
{"@osc.lua",
# include "player/lua/osc.lua.inc"
},
{"@ytdl_hook.lua",
# include "player/lua/ytdl_hook.lua.inc"
},
{"@stats.lua",
# include "player/lua/stats.lua.inc"
},
{"@console.lua",
# include "player/lua/console.lua.inc"
},
{"@auto_profiles.lua",
# include "player/lua/auto_profiles.lua.inc"
},
{"@select.lua",
# include "player/lua/select.lua.inc"
},
{0}
};
// Represents a loaded script. Each has its own Lua state.
struct script_ctx {
const char *name;
const char *filename;
const char *path; // NULL if single file
lua_State *state;
struct mp_log *log;
struct mpv_handle *client;
struct MPContext *mpctx;
size_t lua_malloc_size;
lua_Alloc lua_allocf;
void *lua_alloc_ud;
struct stats_ctx *stats;
};
#if LUA_VERSION_NUM <= 501
#define mp_cpcall lua_cpcall
#else
// Curse whoever had this stupid idea. Curse whoever thought it would be a good
// idea not to include an emulated lua_cpcall() even more.
static int mp_cpcall (lua_State *L, lua_CFunction func, void *ud)
{
lua_pushcfunction(L, func); // doesn't allocate in 5.2 (but does in 5.1)
lua_pushlightuserdata(L, ud);
return lua_pcall(L, 1, 0, 0);
}
#endif
// Ensure that the given argument exists, even if it's nil. Can be used to
// avoid confusing the last missing optional arg with the first temporary value
// pushed to the stack.
static void mp_lua_optarg(lua_State *L, int arg)
{
while (arg > lua_gettop(L))
lua_pushnil(L);
}
// autofree: avoid leaks if a lua-error occurs between talloc new/free.
// If a lua c-function does a new allocation (not tied to an existing context),
// and an uncaught lua-error occurs before "free" - the allocation is leaked.
// autofree lua C function: same as lua_CFunction but with these differences:
// - It accepts an additional void* argument - a pre-initialized talloc context
// which it can use, and which is freed with its children once the function
// completes - regardless if a lua error occurred or not. If a lua error did
// occur then it's re-thrown after the ctx is freed.
// The stack/arguments/upvalues/return are the same as with lua_CFunction.
// - It's inserted into the lua VM using af_pushc{function,closure} instead of
// lua_pushc{function,closure}, which takes care of wrapping it with the
// automatic talloc allocation + lua-error-handling + talloc release.
// This requires using AF_ENTRY instead of FN_ENTRY at struct fn_entry.
// - The autofree overhead per call is roughly two additional plain lua calls.
// Typically that's up to 20% slower than plain new+free without "auto",
// and at most about twice slower - compared to bare new+free lua_CFunction.
// - The overhead of af_push* is one additional lua-c-closure with two upvalues.
typedef int (*af_CFunction)(lua_State *L, void *ctx);
static void af_pushcclosure(lua_State *L, af_CFunction fn, int n);
#define af_pushcfunction(L, fn) af_pushcclosure((L), (fn), 0)
// add_af_dir, add_af_mpv_alloc take a valid DIR*/char* value respectively,
// and closedir/mpv_free it when the parent is freed.
static void destruct_af_dir(void *p)
{
closedir(*(DIR**)p);
}
static void add_af_dir(void *parent, DIR *d)
{
DIR **pd = talloc(parent, DIR*);
*pd = d;
talloc_set_destructor(pd, destruct_af_dir);
}
static void destruct_af_mpv_alloc(void *p)
{
mpv_free(*(char**)p);
}
static void add_af_mpv_alloc(void *parent, char *ma)
{
char **p = talloc(parent, char*);
*p = ma;
talloc_set_destructor(p, destruct_af_mpv_alloc);
}
// Perform the equivalent of mpv_free_node_contents(node) when tmp is freed.
static void steal_node_allocations(void *tmp, mpv_node *node)
{
talloc_steal(tmp, node_get_alloc(node));
}
// lua_Alloc compatible. Serves only to track memory usage. This wraps the
// existing allocator, partly because luajit requires the use of its internal
// allocator on 64-bit platforms.
static void *mp_lua_alloc(void *ud, void *ptr, size_t osize, size_t nsize)
{
struct script_ctx *ctx = ud;
// Ah, what the fuck, screw whoever introduced this to Lua 5.2.
if (!ptr)
osize = 0;
ptr = ctx->lua_allocf(ctx->lua_alloc_ud, ptr, osize, nsize);
if (nsize && !ptr)
return NULL; // allocation failed, so original memory left untouched
ctx->lua_malloc_size = ctx->lua_malloc_size - osize + nsize;
stats_size_value(ctx->stats, "mem", ctx->lua_malloc_size);
return ptr;
}
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 error_handler(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
if (luaL_loadstring(L, "return debug.traceback('', 3)") == 0) { // e fn|err
lua_call(L, 0, 1); // e backtrace
const char *tr = lua_tostring(L, -1);
MP_WARN(ctx, "%s\n", tr ? tr : "(unknown)");
}
lua_pop(L, 1); // e
return 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 void add_functions(struct script_ctx *ctx);
static void load_file(lua_State *L, const char *fname)
{
struct script_ctx *ctx = get_ctx(L);
MP_DBG(ctx, "loading file %s\n", fname);
void *tmp = talloc_new(ctx);
// according to Lua manual chunkname should be '@' plus the filename
char *dispname = talloc_asprintf(tmp, "@%s", fname);
struct bstr s = stream_read_file(fname, tmp, ctx->mpctx->global, 100000000);
if (!s.start)
luaL_error(L, "Could not read file.\n");
if (luaL_loadbuffer(L, s.start, s.len, dispname))
lua_error(L);
lua_call(L, 0, 1);
talloc_free(tmp);
}
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;
}
}
luaL_error(L, "builtin module '%s' not found\n", name);
return 0;
}
// Execute "require " .. name
static void require(lua_State *L, const char *name)
{
struct script_ctx *ctx = get_ctx(L);
MP_DBG(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_error(L);
lua_call(L, 0, 0);
}
// 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_scripts(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *fname = ctx->filename;
require(L, "mp.defaults");
if (fname[0] == '@') {
require(L, fname);
} else {
load_file(L, fname);
}
lua_getglobal(L, "mp_event_loop"); // fn
if (lua_isnil(L, -1))
luaL_error(L, "no event loop function\n");
lua_call(L, 0, 0); // -
return 0;
}
static void fuck_lua(lua_State *L, const char *search_path, const char *extra)
{
void *tmp = talloc_new(NULL);
lua_getglobal(L, "package"); // package
lua_getfield(L, -1, search_path); // package search_path
bstr path = bstr0(lua_tostring(L, -1));
char *newpath = talloc_strdup(tmp, "");
// Script-directory paths take priority.
if (extra) {
newpath = talloc_asprintf_append(newpath, "%s%s",
newpath[0] ? ";" : "",
mp_path_join(tmp, extra, "?.lua"));
}
// Unbelievable but true: Lua loads .lua files AND dynamic libraries from
// the working directory. This is highly security relevant.
// Lua scripts are still supposed to load globally installed libraries, so
// try to get by by filtering out any relative paths.
while (path.len) {
bstr item;
bstr_split_tok(path, ";", &item, &path);
if (mp_path_is_absolute(item)) {
newpath = talloc_asprintf_append(newpath, "%s%.*s",
newpath[0] ? ";" : "",
BSTR_P(item));
}
}
lua_pushstring(L, newpath); // package search_path newpath
lua_setfield(L, -3, search_path); // package search_path
lua_pop(L, 2); // -
talloc_free(tmp);
}
static int run_lua(lua_State *L)
{
struct script_ctx *ctx = lua_touserdata(L, -1);
lua_pop(L, 1); // -
luaL_openlibs(L);
// used by get_ctx()
lua_pushlightuserdata(L, ctx); // ctx
lua_setfield(L, LUA_REGISTRYINDEX, "ctx"); // -
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);
fuck_lua(L, "path", ctx->path);
fuck_lua(L, "cpath", NULL);
assert(lua_gettop(L) == 0);
// run this under an error handler that can do backtraces
lua_pushcfunction(L, error_handler); // errf
lua_pushcfunction(L, load_scripts); // errf fn
if (lua_pcall(L, 0, 0, -2)) { // errf [error]
const char *e = lua_tostring(L, -1);
MP_FATAL(ctx, "Lua error: %s\n", e ? e : "(unknown)");
}
return 0;
}
static int load_lua(struct mp_script_args *args)
{
int r = -1;
struct script_ctx *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (struct script_ctx) {
.mpctx = args->mpctx,
.client = args->client,
.name = mpv_client_name(args->client),
.log = args->log,
.filename = args->filename,
.path = args->path,
.stats = stats_ctx_create(ctx, args->mpctx->global,
mp_tprintf(80, "script/%s", mpv_client_name(args->client))),
};
stats_register_thread_cputime(ctx->stats, "cpu");
if (LUA_VERSION_NUM != 501 && LUA_VERSION_NUM != 502) {
MP_FATAL(ctx, "Only Lua 5.1 and 5.2 are supported.\n");
goto error_out;
}
lua_State *L = ctx->state = luaL_newstate();
if (!L) {
MP_FATAL(ctx, "Could not initialize Lua.\n");
goto error_out;
}
// Wrap the internal allocator with our version that does accounting
ctx->lua_allocf = lua_getallocf(L, &ctx->lua_alloc_ud);
lua_setallocf(L, mp_lua_alloc, ctx);
if (mp_cpcall(L, run_lua, ctx)) {
const char *err = "unknown error";
if (lua_type(L, -1) == LUA_TSTRING) // avoid allocation
err = lua_tostring(L, -1);
MP_FATAL(ctx, "Lua error: %s\n", err);
goto error_out;
}
r = 0;
error_out:
if (ctx->lua_allocf)
lua_setallocf(L, ctx->lua_allocf, ctx->lua_alloc_ud);
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);
int n = mp_msg_find_level(level);
if (n >= 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, (i == 2 ? "%s" : " %s"), s);
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_config_file(NULL, mpctx->global, s);
if (path) {
lua_pushstring(L, path);
} else {
lua_pushnil(L);
}
talloc_free(path);
return 1;
}
static int script_get_script_directory(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
if (ctx->path) {
lua_pushstring(L, ctx->path);
return 1;
}
return 0;
}
static void pushnode(lua_State *L, mpv_node *node);
static int script_raw_wait_event(lua_State *L, void *tmp)
{
struct script_ctx *ctx = get_ctx(L);
mpv_event *event = mpv_wait_event(ctx->client, luaL_optnumber(L, 1, 1e20));
struct mpv_node rn;
mpv_event_to_node(&rn, event);
steal_node_allocations(tmp, &rn);
pushnode(L, &rn); // event
// 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);
const char *level = luaL_checkstring(L, 1);
int r = mpv_request_log_messages(ctx->client, level);
if (r == MPV_ERROR_INVALID_PARAMETER)
luaL_error(L, "Invalid log level '%s'", level);
return check_error(L, r);
}
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_del_property(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
return check_error(L, mpv_del_property(ctx->client, p));
}
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)
{
luaL_checkstack(L, 6, "makenode");
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: {
size_t len = 0;
char *s = (char *)lua_tolstring(L, t, &len);
bool has_zeros = !!memchr(s, 0, len);
if (has_zeros) {
mpv_byte_array *ba = talloc_zero(tmp, mpv_byte_array);
*ba = (mpv_byte_array){talloc_memdup(tmp, s, len), len};
dst->format = MPV_FORMAT_BYTE_ARRAY;
dst->u.ba = ba;
} else {
dst->format = MPV_FORMAT_STRING;
dst->u.string = talloc_strdup(tmp, s);
}
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 - 1;
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) {
luaL_error(L, "key must be a string, but got %s",
lua_typename(L, lua_type(L, -2)));
}
list->keys[list->num] = talloc_strdup(tmp, lua_tostring(L, -2));
list->num++;
lua_pop(L, 1); // key
}
}
break;
}
default:
// unknown type
luaL_error(L, "disallowed Lua type found: %s\n", lua_typename(L, t));
}
}
static int script_set_property_native(lua_State *L, void *tmp)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
struct mpv_node node;
makenode(tmp, &node, L, 2);
int res = mpv_set_property(ctx->client, p, MPV_FORMAT_NODE, &node);
return check_error(L, res);
}
static int script_get_property_base(lua_State *L, void *tmp, int is_osd)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
int type = is_osd ? MPV_FORMAT_OSD_STRING : MPV_FORMAT_STRING;
char *result = NULL;
int err = mpv_get_property(ctx->client, name, type, &result);
if (err >= 0) {
add_af_mpv_alloc(tmp, result);
lua_pushstring(L, 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(lua_State *L, void *tmp)
{
return script_get_property_base(L, tmp, 0);
}
static int script_get_property_osd(lua_State *L, void *tmp)
{
return script_get_property_base(L, tmp, 1);
}
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 void pushnode(lua_State *L, mpv_node *node)
{
luaL_checkstack(L, 6, "pushnode");
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++) {
pushnode(L, &node->u.list->values[n]); // table value
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
pushnode(L, &node->u.list->values[n]); // table key value
lua_rawset(L, -3);
}
break;
case MPV_FORMAT_BYTE_ARRAY:
lua_pushlstring(L, node->u.ba->data, node->u.ba->size);
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;
}
}
static int script_get_property_native(lua_State *L, void *tmp)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
mp_lua_optarg(L, 2);
mpv_node node;
int err = mpv_get_property(ctx->client, name, MPV_FORMAT_NODE, &node);
if (err >= 0) {
steal_node_allocations(tmp, &node);
pushnode(L, &node);
return 1;
}
lua_pushvalue(L, 2);
lua_pushstring(L, mpv_error_string(err));
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_command_native(lua_State *L, void *tmp)
{
struct script_ctx *ctx = get_ctx(L);
mp_lua_optarg(L, 2);
struct mpv_node node;
struct mpv_node result;
makenode(tmp, &node, L, 1);
int err = mpv_command_node(ctx->client, &node, &result);
if (err >= 0) {
steal_node_allocations(tmp, &result);
pushnode(L, &result);
return 1;
}
lua_pushvalue(L, 2);
lua_pushstring(L, mpv_error_string(err));
return 2;
}
static int script_raw_command_native_async(lua_State *L, void *tmp)
{
struct script_ctx *ctx = get_ctx(L);
uint64_t id = luaL_checknumber(L, 1);
struct mpv_node node;
makenode(tmp, &node, L, 2);
int res = mpv_command_node_async(ctx->client, id, &node);
return check_error(L, res);
}
static int script_raw_abort_async_command(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
uint64_t id = luaL_checknumber(L, 1);
mpv_abort_async_command(ctx->client, id);
return 0;
}
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_set_section_mouse_area(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
char *section = (char *)luaL_checkstring(L, 1);
int x0 = luaL_checkinteger(L, 2);
int y0 = luaL_checkinteger(L, 3);
int x1 = luaL_checkinteger(L, 4);
int y1 = luaL_checkinteger(L, 5);
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_raw_hook_add(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
uint64_t ud = luaL_checkinteger(L, 1);
const char *name = luaL_checkstring(L, 2);
int pri = luaL_checkinteger(L, 3);
return check_error(L, mpv_hook_add(ctx->client, ud, name, pri));
}
static int script_raw_hook_continue(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
lua_Integer id = luaL_checkinteger(L, 1);
return check_error(L, mpv_hook_continue(ctx->client, id));
}
static int script_readdir(lua_State *L, void *tmp)
{
// 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;
}
add_af_dir(tmp, dir);
lua_newtable(L); // list
char *fullpath = talloc_strdup(tmp, "");
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 (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
}
return 1;
}
static int script_file_info(lua_State *L)
{
const char *path = luaL_checkstring(L, 1);
struct stat statbuf;
if (stat(path, &statbuf) != 0) {
lua_pushnil(L);
lua_pushstring(L, "error");
return 2;
}
lua_newtable(L); // Result stat table
const char * stat_names[] = {
"mode", "size",
"atime", "mtime", "ctime", NULL
};
const lua_Number stat_values[] = {
statbuf.st_mode,
statbuf.st_size,
statbuf.st_atime,
statbuf.st_mtime,
statbuf.st_ctime
};
// Add all fields
for (int i = 0; stat_names[i]; i++) {
lua_pushnumber(L, stat_values[i]);
lua_setfield(L, -2, stat_names[i]);
}
// Convenience booleans
lua_pushboolean(L, S_ISREG(statbuf.st_mode));
lua_setfield(L, -2, "is_file");
lua_pushboolean(L, S_ISDIR(statbuf.st_mode));
lua_setfield(L, -2, "is_dir");
// Return table
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, void *tmp)
{
const char *p1 = luaL_checkstring(L, 1);
const char *p2 = luaL_checkstring(L, 2);
char *r = mp_path_join(tmp, p1, p2);
lua_pushstring(L, r);
return 1;
}
static int script_parse_json(lua_State *L, void *tmp)
{
mp_lua_optarg(L, 2);
char *text = talloc_strdup(tmp, luaL_checkstring(L, 1));
bool trail = lua_toboolean(L, 2);
bool ok = false;
struct mpv_node node;
if (json_parse(tmp, &node, &text, MAX_JSON_DEPTH) >= 0) {
json_skip_whitespace(&text);
ok = !text[0] || trail;
}
if (ok) {
pushnode(L, &node);
lua_pushnil(L);
} else {
lua_pushnil(L);
lua_pushstring(L, "error");
}
lua_pushstring(L, text);
return 3;
}
static int script_format_json(lua_State *L, void *tmp)
{
struct mpv_node node;
makenode(tmp, &node, L, 1);
char *dst = talloc_strdup(tmp, "");
if (json_write(&dst, &node) >= 0) {
lua_pushstring(L, dst);
return 1;
}
lua_pushnil(L);
lua_pushstring(L, "error");
return 2;
}
static int script_get_env_list(lua_State *L)
{
lua_newtable(L); // table
for (int n = 0; environ && environ[n]; n++) {
lua_pushstring(L, environ[n]); // table str
lua_rawseti(L, -2, n + 1); // table
}
return 1;
}
#define FN_ENTRY(name) {#name, script_ ## name, 0}
#define AF_ENTRY(name) {#name, 0, script_ ## name}
struct fn_entry {
const char *name;
int (*fn)(lua_State *L); // lua_CFunction
int (*af)(lua_State *L, void *); // af_CFunction
};
static const struct fn_entry main_fns[] = {
FN_ENTRY(log),
AF_ENTRY(raw_wait_event),
FN_ENTRY(request_event),
FN_ENTRY(find_config_file),
FN_ENTRY(get_script_directory),
FN_ENTRY(command),
FN_ENTRY(commandv),
AF_ENTRY(command_native),
AF_ENTRY(raw_command_native_async),
FN_ENTRY(raw_abort_async_command),
AF_ENTRY(get_property),
AF_ENTRY(get_property_osd),
FN_ENTRY(get_property_bool),
FN_ENTRY(get_property_number),
AF_ENTRY(get_property_native),
FN_ENTRY(del_property),
FN_ENTRY(set_property),
FN_ENTRY(set_property_bool),
FN_ENTRY(set_property_number),
AF_ENTRY(set_property_native),
FN_ENTRY(raw_observe_property),
FN_ENTRY(raw_unobserve_property),
FN_ENTRY(get_time),
FN_ENTRY(input_set_section_mouse_area),
FN_ENTRY(format_time),
FN_ENTRY(enable_messages),
FN_ENTRY(get_wakeup_pipe),
FN_ENTRY(raw_hook_add),
FN_ENTRY(raw_hook_continue),
{0}
};
static const struct fn_entry utils_fns[] = {
AF_ENTRY(readdir),
FN_ENTRY(file_info),
FN_ENTRY(split_path),
AF_ENTRY(join_path),
AF_ENTRY(parse_json),
AF_ENTRY(format_json),
FN_ENTRY(get_env_list),
{0}
};
typedef struct autofree_data {
af_CFunction target;
void *ctx;
} autofree_data;
/* runs the target autofree script_* function with the ctx argument */
static int script_autofree_call(lua_State *L)
{
// n*args &data
autofree_data *data = lua_touserdata(L, -1);
lua_pop(L, 1); // n*args
assert(data && data->target && data->ctx);
return data->target(L, data->ctx);
}
static int script_autofree_trampoline(lua_State *L)
{
// n*args
autofree_data data = {
.target = lua_touserdata(L, lua_upvalueindex(2)), // fn
.ctx = NULL,
};
assert(data.target);
lua_pushvalue(L, lua_upvalueindex(1)); // n*args autofree_call (closure)
lua_insert(L, 1); // autofree_call n*args
lua_pushlightuserdata(L, &data); // autofree_call n*args &data
data.ctx = talloc_new(NULL);
int r = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0); // m*retvals
talloc_free(data.ctx);
if (r)
lua_error(L);
return lua_gettop(L); // m (retvals)
}
static void af_pushcclosure(lua_State *L, af_CFunction fn, int n)
{
// Instead of pushing a direct closure of fn with n upvalues, we push an
// autofree_trampoline closure with two upvalues:
// 1: autofree_call closure with the n upvalues given here.
// 2: fn
//
// when called the autofree_trampoline closure will pcall the autofree_call
// closure with the current lua call arguments and an additional argument
// which holds ctx and fn. the autofree_call closure (with the n upvalues
// given here) calls fn directly and provides it with the ctx C argument,
// so that fn sees the exact n upvalues and lua call arguments as intended,
// wrapped with ctx init/cleanup.
lua_pushcclosure(L, script_autofree_call, n);
lua_pushlightuserdata(L, fn);
lua_pushcclosure(L, script_autofree_trampoline, 2);
}
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++) {
if (e[n].af) {
af_pushcclosure(L, e[n].af, 0); // modtable fn
} else {
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);
register_package_fns(L, "mp.utils", utils_fns);
}
const struct mp_scripting mp_scripting_lua = {
.name = "lua",
.file_ext = "lua",
.load = load_lua,
};
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