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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 <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.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 "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.inc"
},
{"mp.assdraw",
# include "player/lua/assdraw.inc"
},
{"mp.options",
# include "player/lua/options.inc"
},
{"@osc.lua",
# include "player/lua/osc.inc"
},
{"@ytdl_hook.lua",
# include "player/lua/ytdl_hook.inc"
},
{0}
};
// Represents a loaded script. Each has its own Lua state.
struct script_ctx {
const char *name;
const char *filename;
lua_State *state;
struct mp_log *log;
struct mpv_handle *client;
struct MPContext *mpctx;
};
#if LUA_VERSION_NUM <= 501
#define mp_cpcall lua_cpcall
#define mp_lua_len lua_objlen
#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);
}
#define mp_lua_len lua_rawlen
#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);
}
static int destroy_crap(lua_State *L)
{
void **data = luaL_checkudata(L, 1, "ohthispain");
talloc_free(data[0]);
data[0] = NULL;
return 0;
}
// Creates a small userdata object and pushes it to the Lua stack. The function
// will (on the C level) return a talloc object that will be released by the
// userdata gc routine.
// This can be used to free temporary C data structures correctly if Lua errors
// happen.
// You can't free the talloc context directly; the Lua __gc handler does this.
// In my cases, talloc_free_children(returnval) will be used to free attached
// memory in advance when it's known not to be needed anymore (a minor
// optimization). Freeing it completely must be left to the Lua GC.
static void *mp_lua_PITA(lua_State *L)
{
void **data = lua_newuserdata(L, sizeof(void *)); // u
if (luaL_newmetatable(L, "ohthispain")) { // u metatable
lua_pushvalue(L, -1); // u metatable metatable
lua_setfield(L, -2, "__index"); // u metatable
lua_pushcfunction(L, destroy_crap); // u metatable gc
lua_setfield(L, -2, "__gc"); // u metatable
}
lua_setmetatable(L, -2); // u
*data = talloc_new(NULL);
return *data;
}
// Perform the equivalent of mpv_free_node_contents(node) when tmp is freed.
static void auto_free_node(void *tmp, mpv_node *node)
{
talloc_steal(tmp, node_get_alloc(node));
}
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);
char *res_name = mp_get_user_path(NULL, ctx->mpctx->global, fname);
MP_VERBOSE(ctx, "loading file %s\n", res_name);
int r = luaL_loadfile(L, res_name);
talloc_free(res_name); // careful to not leak this on Lua errors
if (r)
lua_error(L);
lua_call(L, 0, 0);
}
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_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_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 set_path(lua_State *L)
{
void *tmp = talloc_new(NULL);
lua_getglobal(L, "package"); // package
lua_getfield(L, -1, "path"); // package path
const char *path = lua_tostring(L, -1);
char *newpath = talloc_strdup(tmp, path ? path : "");
char **luadir = mp_find_all_config_files(tmp, get_mpctx(L)->global, "scripts");
for (int i = 0; luadir && luadir[i]; i++) {
newpath = talloc_asprintf_append(newpath, ";%s",
mp_path_join(tmp, luadir[i], "?.lua"));
}
lua_pushstring(L, newpath); // package path newpath
lua_setfield(L, -3, "path"); // package 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);
set_path(L);
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 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),
.filename = fname,
};
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;
}
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->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_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);
MP_ERR(ctx, "mp.suspend() is deprecated and does nothing.\n");
return 0;
}
static int script_resume(lua_State *L)
{
return 0;
}
static int script_resume_all(lua_State *L)
{
return 0;
}
static void pushnode(lua_State *L, mpv_node *node);
static int script_wait_event(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
mpv_event *event = mpv_wait_event(ctx->client, luaL_optnumber(L, 1, 1e20));
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_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_END_FILE: {
mpv_event_end_file *eef = event->data;
const char *reason;
switch (eef->reason) {
case MPV_END_FILE_REASON_EOF: reason = "eof"; break;
case MPV_END_FILE_REASON_STOP: reason = "stop"; break;
case MPV_END_FILE_REASON_QUIT: reason = "quit"; break;
case MPV_END_FILE_REASON_ERROR: reason = "error"; break;
case MPV_END_FILE_REASON_REDIRECT: reason = "redirect"; break;
default:
reason = "unknown";
}
lua_pushstring(L, reason); // event reason
lua_setfield(L, -2, "reason"); // event
if (eef->reason == MPV_END_FILE_REASON_ERROR) {
lua_pushstring(L, mpv_error_string(eef->error)); // event error
lua_setfield(L, -2, "error"); // 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:
pushnode(L, prop->data);
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 - 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)
{
struct script_ctx *ctx = get_ctx(L);
const char *p = luaL_checkstring(L, 1);
struct mpv_node node;
void *tmp = mp_lua_PITA(L);
makenode(tmp, &node, L, 2);
int res = mpv_set_property(ctx->client, p, MPV_FORMAT_NODE, &node);
talloc_free_children(tmp);
return check_error(L, res);
}
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 void pushnode(lua_State *L, mpv_node *node)
{
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++) {
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)
{
struct script_ctx *ctx = get_ctx(L);
const char *name = luaL_checkstring(L, 1);
mp_lua_optarg(L, 2);
void *tmp = mp_lua_PITA(L);
mpv_node node;
int err = mpv_get_property(ctx->client, name, MPV_FORMAT_NODE, &node);
if (err >= 0) {
auto_free_node(tmp, &node);
pushnode(L, &node);
talloc_free_children(tmp);
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)
{
struct script_ctx *ctx = get_ctx(L);
mp_lua_optarg(L, 2);
struct mpv_node node;
struct mpv_node result;
void *tmp = mp_lua_PITA(L);
makenode(tmp, &node, L, 1);
int err = mpv_command_node(ctx->client, &node, &result);
if (err >= 0) {
auto_free_node(tmp, &result);
pushnode(L, &result);
talloc_free_children(tmp);
return 1;
}
lua_pushvalue(L, 2);
lua_pushstring(L, mpv_error_string(err));
return 2;
}
static int script_set_osd_ass(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
int res_x = luaL_checkinteger(L, 1);
int res_y = luaL_checkinteger(L, 2);
const char *text = luaL_checkstring(L, 3);
if (!text[0])
text = " "; // force external OSD initialization
osd_set_external(ctx->mpctx->osd, ctx->client, res_x, res_y, (char *)text);
mp_wakeup_core(ctx->mpctx);
return 0;
}
static int script_get_osd_size(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
struct mp_osd_res vo_res = osd_get_vo_res(mpctx->osd);
double aspect = 1.0 * vo_res.w / MPMAX(vo_res.h, 1) /
(vo_res.display_par ? vo_res.display_par : 1);
lua_pushnumber(L, vo_res.w);
lua_pushnumber(L, vo_res.h);
lua_pushnumber(L, aspect);
return 3;
}
static int script_get_osd_margins(lua_State *L)
{
struct MPContext *mpctx = get_mpctx(L);
struct mp_osd_res vo_res = osd_get_vo_res(mpctx->osd);
lua_pushnumber(L, vo_res.ml);
lua_pushnumber(L, vo_res.mt);
lua_pushnumber(L, vo_res.mr);
lua_pushnumber(L, vo_res.mb);
return 4;
}
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);
lua_pushnumber(L, px);
lua_pushnumber(L, py);
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_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_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 (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
}
closedir(dir);
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, p1, p2);
lua_pushstring(L, r);
talloc_free(r);
return 1;
}
struct subprocess_cb_ctx {
struct mp_log *log;
void* talloc_ctx;
int64_t max_size;
bstr output;
};
static void subprocess_stdout(void *p, char *data, size_t size)
{
struct subprocess_cb_ctx *ctx = p;
if (ctx->output.len < ctx->max_size)
bstr_xappend(ctx->talloc_ctx, &ctx->output, (bstr){data, size});
}
static void subprocess_stderr(void *p, char *data, size_t size)
{
struct subprocess_cb_ctx *ctx = p;
MP_INFO(ctx, "%.*s", (int)size, data);
}
static int script_subprocess(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
luaL_checktype(L, 1, LUA_TTABLE);
void *tmp = mp_lua_PITA(L);
lua_getfield(L, 1, "args"); // args
int num_args = mp_lua_len(L, -1);
char *args[256];
if (num_args > MP_ARRAY_SIZE(args) - 1) // last needs to be NULL
luaL_error(L, "too many arguments");
if (num_args < 1)
luaL_error(L, "program name missing");
for (int n = 0; n < num_args; n++) {
lua_pushinteger(L, n + 1); // args n
lua_gettable(L, -2); // args arg
args[n] = talloc_strdup(tmp, lua_tostring(L, -1));
if (!args[n])
luaL_error(L, "program arguments must be strings");
lua_pop(L, 1); // args
}
args[num_args] = NULL;
lua_pop(L, 1); // -
lua_getfield(L, 1, "cancellable"); // c
struct mp_cancel *cancel = NULL;
if (lua_isnil(L, -1) ? true : lua_toboolean(L, -1))
cancel = ctx->mpctx->playback_abort;
lua_pop(L, 1); // -
lua_getfield(L, 1, "max_size"); // m
int64_t max_size = lua_isnil(L, -1) ? 16 * 1024 * 1024 : lua_tointeger(L, -1);
struct subprocess_cb_ctx cb_ctx = {
.log = ctx->log,
.talloc_ctx = tmp,
.max_size = max_size,
};
char *error = NULL;
int status = mp_subprocess(args, cancel, &cb_ctx, subprocess_stdout,
subprocess_stderr, &error);
lua_newtable(L); // res
if (error) {
lua_pushstring(L, error); // res e
lua_setfield(L, -2, "error"); // res
}
lua_pushinteger(L, status); // res s
lua_setfield(L, -2, "status"); // res
lua_pushlstring(L, cb_ctx.output.start, cb_ctx.output.len); // res d
lua_setfield(L, -2, "stdout"); // res
lua_pushboolean(L, status == MP_SUBPROCESS_EKILLED_BY_US); // res b
lua_setfield(L, -2, "killed_by_us"); // res
return 1;
}
static int script_subprocess_detached(lua_State *L)
{
struct script_ctx *ctx = get_ctx(L);
luaL_checktype(L, 1, LUA_TTABLE);
void *tmp = mp_lua_PITA(L);
lua_getfield(L, 1, "args"); // args
int num_args = mp_lua_len(L, -1);
char *args[256];
if (num_args > MP_ARRAY_SIZE(args) - 1) // last needs to be NULL
luaL_error(L, "too many arguments");
if (num_args < 1)
luaL_error(L, "program name missing");
for (int n = 0; n < num_args; n++) {
lua_pushinteger(L, n + 1); // args n
lua_gettable(L, -2); // args arg
args[n] = talloc_strdup(tmp, lua_tostring(L, -1));
if (!args[n])
luaL_error(L, "program arguments must be strings");
lua_pop(L, 1); // args
}
args[num_args] = NULL;
lua_pop(L, 1); // -
mp_subprocess_detached(ctx->log, args);
lua_pushnil(L);
return 1;
}
static int script_parse_json(lua_State *L)
{
mp_lua_optarg(L, 2);
void *tmp = mp_lua_PITA(L);
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, 32) >= 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);
talloc_free_children(tmp);
return 3;
}
static int script_format_json(lua_State *L)
{
void *tmp = mp_lua_PITA(L);
struct mpv_node node;
makenode(tmp, &node, L, 1);
char *dst = talloc_strdup(tmp, "");
if (json_write(&dst, &node) >= 0) {
lua_pushstring(L, dst);
lua_pushnil(L);
} else {
lua_pushnil(L);
lua_pushstring(L, "error");
}
talloc_free_children(tmp);
return 2;
}
#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(command_native),
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(set_osd_ass),
FN_ENTRY(get_osd_size),
FN_ENTRY(get_osd_margins),
FN_ENTRY(get_mouse_pos),
FN_ENTRY(get_time),
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),
FN_ENTRY(subprocess),
FN_ENTRY(subprocess_detached),
FN_ENTRY(parse_json),
FN_ENTRY(format_json),
{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 = {
.name = "lua script",
.file_ext = "lua",
.load = load_lua,
};
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