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mpv/player/scripting.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 <string.h>
#include <strings.h>
#include <sys/types.h>
#include <dirent.h>
#include <math.h>
#include <pthread.h>
#include <assert.h>
#include "config.h"
#include "osdep/io.h"
#include "osdep/threads.h"
#include "common/common.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "options/parse_configfile.h"
#include "options/path.h"
#include "misc/bstr.h"
#include "core.h"
#include "client.h"
#include "libmpv/client.h"
extern const struct mp_scripting mp_scripting_lua;
extern const struct mp_scripting mp_scripting_cplugin;
extern const struct mp_scripting mp_scripting_js;
static const struct mp_scripting *const scripting_backends[] = {
#if HAVE_LUA
&mp_scripting_lua,
#endif
#if HAVE_CPLUGINS
&mp_scripting_cplugin,
#endif
#if HAVE_JAVASCRIPT
&mp_scripting_js,
#endif
NULL
};
static char *script_name_from_filename(void *talloc_ctx, const char *fname)
{
fname = mp_basename(fname);
if (fname[0] == '@')
fname += 1;
char *name = talloc_strdup(talloc_ctx, fname);
// Drop file extension
char *dot = strrchr(name, '.');
if (dot)
*dot = '\0';
// Turn it into a safe identifier - this is used with e.g. dispatching
// input via: "send scriptname ..."
for (int n = 0; name[n]; n++) {
char c = name[n];
if (!(c >= 'A' && c <= 'Z') && !(c >= 'a' && c <= 'z') &&
!(c >= '0' && c <= '9'))
name[n] = '_';
}
return talloc_asprintf(talloc_ctx, "%s", name);
}
static void *script_thread(void *p)
{
pthread_detach(pthread_self());
struct mp_script_args *arg = p;
char name[90];
snprintf(name, sizeof(name), "%s (%s)", arg->backend->name,
mpv_client_name(arg->client));
mpthread_set_name(name);
if (arg->backend->load(arg) < 0)
MP_ERR(arg, "Could not load %s %s\n", arg->backend->name, arg->filename);
mpv_destroy(arg->client);
talloc_free(arg);
return NULL;
}
static int mp_load_script(struct MPContext *mpctx, const char *fname)
{
char *ext = mp_splitext(fname, NULL);
if (ext && strcasecmp(ext, "disable") == 0)
return 0;
void *tmp = talloc_new(NULL);
const char *path = NULL;
char *script_name = NULL;
const struct mp_scripting *backend = NULL;
struct stat s;
if (!stat(fname, &s) && S_ISDIR(s.st_mode)) {
path = fname;
fname = NULL;
for (int n = 0; scripting_backends[n]; n++) {
const struct mp_scripting *b = scripting_backends[n];
char *filename = mp_tprintf(80, "main.%s", b->file_ext);
fname = mp_path_join(tmp, path, filename);
if (!stat(fname, &s) && S_ISREG(s.st_mode)) {
backend = b;
break;
}
talloc_free((void *)fname);
fname = NULL;
}
if (!fname) {
MP_ERR(mpctx, "Cannot find main.* for any supported scripting "
"backend in: %s\n", path);
talloc_free(tmp);
return -1;
}
script_name = talloc_strdup(tmp, path);
mp_path_strip_trailing_separator(script_name);
script_name = mp_basename(script_name);
} else {
for (int n = 0; scripting_backends[n]; n++) {
const struct mp_scripting *b = scripting_backends[n];
if (ext && strcasecmp(ext, b->file_ext) == 0) {
backend = b;
break;
}
}
script_name = script_name_from_filename(tmp, fname);
}
if (!backend) {
MP_ERR(mpctx, "Can't load unknown script: %s\n", fname);
talloc_free(tmp);
return -1;
}
struct mp_script_args *arg = talloc_ptrtype(NULL, arg);
*arg = (struct mp_script_args){
.mpctx = mpctx,
.filename = talloc_strdup(arg, fname),
.path = talloc_strdup(arg, path),
.backend = backend,
// Create the client before creating the thread; otherwise a race
// condition could happen, where MPContext is destroyed while the
// thread tries to create the client.
.client = mp_new_client(mpctx->clients, script_name),
};
talloc_free(tmp);
if (!arg->client) {
MP_ERR(mpctx, "Failed to create client for script: %s\n", fname);
talloc_free(arg);
return -1;
}
mp_client_set_weak(arg->client);
arg->log = mp_client_get_log(arg->client);
MP_DBG(arg, "Loading %s %s...\n", backend->name, fname);
pthread_t thread;
if (pthread_create(&thread, NULL, script_thread, arg)) {
mpv_destroy(arg->client);
talloc_free(arg);
return -1;
}
return 0;
}
int mp_load_user_script(struct MPContext *mpctx, const char *fname)
{
char *path = mp_get_user_path(NULL, mpctx->global, fname);
int ret = mp_load_script(mpctx, path);
talloc_free(path);
return ret;
}
static int compare_filename(const void *pa, const void *pb)
{
char *a = (char *)pa;
char *b = (char *)pb;
return strcmp(a, b);
}
static char **list_script_files(void *talloc_ctx, char *path)
{
char **files = NULL;
int count = 0;
DIR *dp = opendir(path);
if (!dp)
return NULL;
struct dirent *ep;
while ((ep = readdir(dp))) {
if (ep->d_name[0] != '.') {
char *fname = mp_path_join(talloc_ctx, path, ep->d_name);
struct stat s;
if (!stat(fname, &s) && (S_ISREG(s.st_mode) || S_ISDIR(s.st_mode)))
MP_TARRAY_APPEND(talloc_ctx, files, count, fname);
}
}
closedir(dp);
if (files)
qsort(files, count, sizeof(char *), compare_filename);
MP_TARRAY_APPEND(talloc_ctx, files, count, NULL);
return files;
}
static void load_builtin_script(struct MPContext *mpctx, bool enable,
const char *fname)
{
void *tmp = talloc_new(NULL);
// (The name doesn't have to match if there were conflicts with other
// scripts, so this is on best-effort basis.)
char *name = script_name_from_filename(tmp, fname);
if (enable != mp_client_exists(mpctx, name)) {
if (enable) {
mp_load_script(mpctx, fname);
} else {
// Try to unload it by sending a shutdown event. This can be
// unreliable, because user scripts could have clashing names, or
// disabling and then quickly re-enabling a builtin script might
// detect the still-terminating script as loaded.
mp_client_send_event(mpctx, name, 0, MPV_EVENT_SHUTDOWN, NULL);
}
}
talloc_free(tmp);
}
void mp_load_builtin_scripts(struct MPContext *mpctx)
{
load_builtin_script(mpctx, mpctx->opts->lua_load_osc, "@osc.lua");
load_builtin_script(mpctx, mpctx->opts->lua_load_ytdl, "@ytdl_hook.lua");
load_builtin_script(mpctx, mpctx->opts->lua_load_stats, "@stats.lua");
load_builtin_script(mpctx, mpctx->opts->lua_load_console, "@console.lua");
}
bool mp_load_scripts(struct MPContext *mpctx)
{
bool ok = true;
// Load scripts from options
char **files = mpctx->opts->script_files;
for (int n = 0; files && files[n]; n++) {
if (files[n][0])
ok &= mp_load_user_script(mpctx, files[n]) >= 0;
}
if (!mpctx->opts->auto_load_scripts)
return ok;
// Load all scripts
void *tmp = talloc_new(NULL);
char **scriptsdir = mp_find_all_config_files(tmp, mpctx->global, "scripts");
for (int i = 0; scriptsdir && scriptsdir[i]; i++) {
files = list_script_files(tmp, scriptsdir[i]);
for (int n = 0; files && files[n]; n++)
ok &= mp_load_script(mpctx, files[n]) >= 0;
}
talloc_free(tmp);
return ok;
}
#if HAVE_CPLUGINS
#include <dlfcn.h>
#define MPV_DLOPEN_FN "mpv_open_cplugin"
typedef int (*mpv_open_cplugin)(mpv_handle *handle);
static int load_cplugin(struct mp_script_args *args)
{
void *lib = dlopen(args->filename, RTLD_NOW | RTLD_LOCAL);
if (!lib)
goto error;
// Note: once loaded, we never unload, as unloading the libraries linked to
// the plugin can cause random serious problems.
mpv_open_cplugin sym = (mpv_open_cplugin)dlsym(lib, MPV_DLOPEN_FN);
if (!sym)
goto error;
return sym(args->client) ? -1 : 0;
error: ;
char *err = dlerror();
if (err)
MP_ERR(args, "C plugin error: '%s'\n", err);
return -1;
}
const struct mp_scripting mp_scripting_cplugin = {
.name = "SO plugin",
.file_ext = "so",
.load = load_cplugin,
};
#endif
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