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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 <sys/types.h>
#include <math.h>
#include <assert.h>
#include "config.h"
#include "osdep/io.h"
#include "osdep/subprocess.h"
#include "osdep/threads.h"
#include "common/common.h"
#include "common/msg.h"
#include "input/input.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"
#include "libmpv/render.h"
#include "libmpv/stream_cb.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;
extern const struct mp_scripting mp_scripting_run;
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
&mp_scripting_run,
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 run_script(struct mp_script_args *arg)
{
char *name = talloc_asprintf(NULL, "%s/%s", arg->backend->name,
mpv_client_name(arg->client));
mp_thread_set_name(name);
talloc_free(name);
if (arg->backend->load(arg) < 0)
MP_ERR(arg, "Could not load %s script %s\n", arg->backend->name, arg->filename);
mpv_destroy(arg->client);
talloc_free(arg);
}
static MP_THREAD_VOID script_thread(void *p)
{
struct mp_script_args *arg = p;
run_script(arg);
MP_THREAD_RETURN();
}
static int64_t 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);
fname = NULL; // might have been freed so don't touch anymore
if (!arg->client) {
MP_ERR(mpctx, "Failed to create client for script: %s\n", arg->filename);
talloc_free(arg);
return -1;
}
mp_client_set_weak(arg->client);
arg->log = mp_client_get_log(arg->client);
int64_t id = mpv_client_id(arg->client);
MP_DBG(arg, "Loading %s script %s...\n", backend->name, arg->filename);
if (backend->no_thread) {
run_script(arg);
} else {
mp_thread thread;
if (mp_thread_create(&thread, script_thread, arg)) {
mpv_destroy(arg->client);
talloc_free(arg);
return -1;
}
mp_thread_detach(thread);
}
return id;
}
int64_t mp_load_user_script(struct MPContext *mpctx, const char *fname)
{
char *path = mp_get_user_path(NULL, mpctx->global, fname);
int64_t 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, int slot, bool enable,
const char *fname)
{
assert(slot < MP_ARRAY_SIZE(mpctx->builtin_script_ids));
int64_t *pid = &mpctx->builtin_script_ids[slot];
if (*pid > 0 && !mp_client_id_exists(mpctx, *pid))
*pid = 0; // died
if ((*pid > 0) != enable) {
if (enable) {
*pid = mp_load_script(mpctx, fname);
} else {
char *name = mp_tprintf(22, "@%"PRIi64, *pid);
mp_client_send_event(mpctx, name, 0, MPV_EVENT_SHUTDOWN, NULL);
}
}
}
void mp_load_builtin_scripts(struct MPContext *mpctx)
{
load_builtin_script(mpctx, 0, mpctx->opts->lua_load_osc, "@osc.lua");
load_builtin_script(mpctx, 1, mpctx->opts->lua_load_ytdl, "@ytdl_hook.lua");
load_builtin_script(mpctx, 2, mpctx->opts->lua_load_stats, "@stats.lua");
load_builtin_script(mpctx, 3, mpctx->opts->lua_load_console, "@console.lua");
load_builtin_script(mpctx, 4, mpctx->opts->lua_load_auto_profiles,
"@auto_profiles.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
#ifndef _WIN32
#include <dlfcn.h>
#endif
#define MPV_DLOPEN_FN "mpv_open_cplugin"
typedef int (*mpv_open_cplugin)(mpv_handle *handle);
static void init_sym_table(struct mp_script_args *args, void *lib) {
#define INIT_SYM(name) \
{ \
void **sym = (void **)dlsym(lib, "pfn_" #name); \
if (sym) { \
if (*sym && *sym != &name) \
MP_ERR(args, "Overriding already set function " #name "\n"); \
*sym = &name; \
} \
}
INIT_SYM(mpv_client_api_version);
INIT_SYM(mpv_error_string);
INIT_SYM(mpv_free);
INIT_SYM(mpv_client_name);
INIT_SYM(mpv_client_id);
INIT_SYM(mpv_create);
INIT_SYM(mpv_initialize);
INIT_SYM(mpv_destroy);
INIT_SYM(mpv_terminate_destroy);
INIT_SYM(mpv_create_client);
INIT_SYM(mpv_create_weak_client);
INIT_SYM(mpv_load_config_file);
INIT_SYM(mpv_get_time_us);
INIT_SYM(mpv_free_node_contents);
INIT_SYM(mpv_set_option);
INIT_SYM(mpv_set_option_string);
INIT_SYM(mpv_command);
INIT_SYM(mpv_command_node);
INIT_SYM(mpv_command_ret);
INIT_SYM(mpv_command_string);
INIT_SYM(mpv_command_async);
INIT_SYM(mpv_command_node_async);
INIT_SYM(mpv_abort_async_command);
INIT_SYM(mpv_set_property);
INIT_SYM(mpv_set_property_string);
INIT_SYM(mpv_del_property);
INIT_SYM(mpv_set_property_async);
INIT_SYM(mpv_get_property);
INIT_SYM(mpv_get_property_string);
INIT_SYM(mpv_get_property_osd_string);
INIT_SYM(mpv_get_property_async);
INIT_SYM(mpv_observe_property);
INIT_SYM(mpv_unobserve_property);
INIT_SYM(mpv_event_name);
INIT_SYM(mpv_event_to_node);
INIT_SYM(mpv_request_event);
INIT_SYM(mpv_request_log_messages);
INIT_SYM(mpv_wait_event);
INIT_SYM(mpv_wakeup);
INIT_SYM(mpv_set_wakeup_callback);
INIT_SYM(mpv_wait_async_requests);
INIT_SYM(mpv_hook_add);
INIT_SYM(mpv_hook_continue);
INIT_SYM(mpv_get_wakeup_pipe);
INIT_SYM(mpv_render_context_create);
INIT_SYM(mpv_render_context_set_parameter);
INIT_SYM(mpv_render_context_get_info);
INIT_SYM(mpv_render_context_set_update_callback);
INIT_SYM(mpv_render_context_update);
INIT_SYM(mpv_render_context_render);
INIT_SYM(mpv_render_context_report_swap);
INIT_SYM(mpv_render_context_free);
INIT_SYM(mpv_stream_cb_add_ro);
#undef INIT_SYM
}
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;
init_sym_table(args, lib);
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 = "cplugin",
#ifdef _WIN32
.file_ext = "dll",
#else
.file_ext = "so",
#endif
.load = load_cplugin,
};
#endif
static int load_run(struct mp_script_args *args)
{
// The arg->client object might die and with it args->log, so duplicate it.
args->log = mp_log_new(args, args->log, NULL);
int fds[2];
if (!mp_ipc_start_anon_client(args->mpctx->ipc_ctx, args->client, fds))
return -1;
args->client = NULL; // ownership lost
char *fdopt = fds[1] >= 0 ? mp_tprintf(80, "--mpv-ipc-fd=%d:%d", fds[0], fds[1])
: mp_tprintf(80, "--mpv-ipc-fd=%d", fds[0]);
struct mp_subprocess_opts opts = {
.exe = (char *)args->filename,
.args = (char *[]){(char *)args->filename, fdopt, NULL},
.fds = {
// Keep terminal stuff
{.fd = 0, .src_fd = 0,},
{.fd = 1, .src_fd = 1,},
{.fd = 2, .src_fd = 2,},
// Just hope these don't step over each other (e.g. fds[1] could be
// below 4, if the std FDs are missing).
{.fd = fds[0], .src_fd = fds[0], },
{.fd = fds[1], .src_fd = fds[1], },
},
.num_fds = fds[1] >= 0 ? 5 : 4,
.detach = true,
};
struct mp_subprocess_result res;
mp_subprocess2(&opts, &res);
// Closing these will (probably) make the client exit, if it really died.
// They _should_ be CLOEXEC, but are not, because
// posix_spawn_file_actions_adddup2() may not clear the CLOEXEC flag
// properly if by coincidence fd==src_fd.
close(fds[0]);
if (fds[1] >= 0)
close(fds[1]);
if (res.error < 0) {
MP_ERR(args, "Starting '%s' failed: %s\n", args->filename,
mp_subprocess_err_str(res.error));
return -1;
}
return 0;
}
const struct mp_scripting mp_scripting_run = {
.name = "ipc",
.file_ext = "run",
.no_thread = true,
.load = load_run,
};
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