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mpv/options/m_config.c
wm4 d2bdb72b69 options: add a thread-safe way to notify option updates 
So far, we had a thread-safe way to read options, but no option update
notification mechanism. Everything was funneled though the main thread's
central mp_option_change_callback() function. For example, if the
panscan options were changed, the function called vo_control() with
VOCTRL_SET_PANSCAN to manually notify the VO thread of updates. This
worked, but's pretty inconvenient. Most of these problems come from the
fact that MPlayer was written as a single-threaded program.

This commit works towards a more flexible mechanism. It adds an update
callback to m_config_cache (the thing that is already used for
thread-safe access of global options).

This alone would still be rather inconvenient, at least in context of
VOs. Add another mechanism on top of it that uses mp_dispatch_queue, and
takes care of some annoying synchronization issues. We extend
mp_dispatch_queue itself to make this easier and slightly more
efficient.

As a first application, use this to reimplement certain VO scaling and
renderer options. The update_opts() function translates these to the
"old" VOCTRLs, though.

An annoyingly subtle issue is that m_config_cache's destructor now
releases pending notifications, and must be released before the
associated dispatch queue. Otherwise, it could happen that option
updates during e.g. VO destruction queue or run stale entries, which is
not expected.

Rather untested. The singly-linked list code in dispatch.c is probably
buggy, and I bet some aspects about synchronization are not entirely
sane.
2017-08-22 15:50:33 +02:00

1426 lines
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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/>.
*/
/// \file
/// \ingroup Config
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <stdbool.h>
#include <pthread.h>
#include "libmpv/client.h"
#include "mpv_talloc.h"
#include "m_config.h"
#include "options/m_option.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "misc/dispatch.h"
#include "misc/node.h"
#include "osdep/atomic.h"
extern const char mp_help_text[];
static const union m_option_value default_value;
// Profiles allow to predefine some sets of options that can then
// be applied later on with the internal -profile option.
#define MAX_PROFILE_DEPTH 20
// Maximal include depth.
#define MAX_RECURSION_DEPTH 8
// For use with m_config_cache.
struct m_config_shadow {
pthread_mutex_t lock;
struct m_config *root;
char *data;
struct m_config_cache **listeners;
int num_listeners;
};
// Represents a sub-struct (OPT_SUBSTRUCT()).
struct m_config_group {
const struct m_sub_options *group; // or NULL for top-level options
int parent_group; // index of parent group in m_config.groups
void *opts; // pointer to group user option struct
atomic_llong ts; // incremented on every write access
};
struct m_profile {
struct m_profile *next;
char *name;
char *desc;
int num_opts;
// Option/value pair array.
char **opts;
};
// In the file local case, this contains the old global value.
struct m_opt_backup {
struct m_opt_backup *next;
struct m_config_option *co;
void *backup;
};
static int show_profile(struct m_config *config, bstr param)
{
struct m_profile *p;
if (!param.len)
return M_OPT_MISSING_PARAM;
if (!(p = m_config_get_profile(config, param))) {
MP_ERR(config, "Unknown profile '%.*s'.\n", BSTR_P(param));
return M_OPT_EXIT;
}
if (!config->profile_depth)
MP_INFO(config, "Profile %s: %s\n", p->name,
p->desc ? p->desc : "");
config->profile_depth++;
for (int i = 0; i < p->num_opts; i++) {
MP_INFO(config, "%*s%s=%s\n", config->profile_depth, "",
p->opts[2 * i], p->opts[2 * i + 1]);
if (config->profile_depth < MAX_PROFILE_DEPTH
&& !strcmp(p->opts[2*i], "profile")) {
char *e, *list = p->opts[2 * i + 1];
while ((e = strchr(list, ','))) {
int l = e - list;
if (!l)
continue;
show_profile(config, (bstr){list, e - list});
list = e + 1;
}
if (list[0] != '\0')
show_profile(config, bstr0(list));
}
}
config->profile_depth--;
if (!config->profile_depth)
MP_INFO(config, "\n");
return M_OPT_EXIT;
}
// The memcpys are supposed to work around the strict aliasing violation,
// that would result if we just dereferenced a void** (where the void** is
// actually casted from struct some_type* ). The dummy struct type is in
// theory needed, because void* and struct pointers could have different
// representations, while pointers to different struct types don't.
static void *substruct_read_ptr(const void *ptr)
{
struct mp_dummy_ *res;
memcpy(&res, ptr, sizeof(res));
return res;
}
static void substruct_write_ptr(void *ptr, void *val)
{
struct mp_dummy_ *src = val;
memcpy(ptr, &src, sizeof(src));
}
static void add_options(struct m_config *config,
struct m_config_option *parent,
void *optstruct,
const void *optstruct_def,
const struct m_option *defs);
static void config_destroy(void *p)
{
struct m_config *config = p;
m_config_restore_backups(config);
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
m_option_free(co->opt, co->data);
if (config->shadow && co->shadow_offset >= 0)
m_option_free(co->opt, config->shadow->data + co->shadow_offset);
}
if (config->shadow) {
// must all have been unregistered
assert(config->shadow->num_listeners == 0);
pthread_mutex_destroy(&config->shadow->lock);
}
}
struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
size_t size, const void *defaults,
const struct m_option *options)
{
struct m_config *config = talloc(talloc_ctx, struct m_config);
talloc_set_destructor(config, config_destroy);
*config = (struct m_config)
{.log = log, .size = size, .defaults = defaults, .options = options};
// size==0 means a dummy object is created
if (size) {
config->optstruct = talloc_zero_size(config, size);
if (defaults)
memcpy(config->optstruct, defaults, size);
}
config->num_groups = 1;
MP_TARRAY_GROW(config, config->groups, 1);
config->groups[0] = (struct m_config_group){
.parent_group = -1,
.opts = config->optstruct,
};
if (options)
add_options(config, NULL, config->optstruct, defaults, options);
return config;
}
struct m_config *m_config_from_obj_desc(void *talloc_ctx, struct mp_log *log,
struct m_obj_desc *desc)
{
return m_config_new(talloc_ctx, log, desc->priv_size, desc->priv_defaults,
desc->options);
}
// Like m_config_from_obj_desc(), but don't allocate option struct.
struct m_config *m_config_from_obj_desc_noalloc(void *talloc_ctx,
struct mp_log *log,
struct m_obj_desc *desc)
{
return m_config_new(talloc_ctx, log, 0, desc->priv_defaults, desc->options);
}
static struct m_config_group *find_group(struct mpv_global *global,
const struct m_option *cfg)
{
struct m_config_shadow *shadow = global->config;
struct m_config *root = shadow->root;
for (int n = 0; n < root->num_groups; n++) {
if (cfg && root->groups[n].group && root->groups[n].group->opts == cfg)
return &root->groups[n];
}
return NULL;
}
// Allocate a priv struct that is backed by global options (like AOs and VOs,
// anything that uses m_obj_list.use_global_options == true).
// The result contains a snapshot of the current option values of desc->options.
// For convenience, desc->options can be NULL; then priv struct is allocated
// with just zero (or priv_defaults if set).
void *m_config_group_from_desc(void *ta_parent, struct mp_log *log,
struct mpv_global *global, struct m_obj_desc *desc, const char *name)
{
struct m_config_group *group = find_group(global, desc->options);
if (group) {
return mp_get_config_group(ta_parent, global, group->group);
} else {
void *d = talloc_zero_size(ta_parent, desc->priv_size);
if (desc->priv_defaults)
memcpy(d, desc->priv_defaults, desc->priv_size);
return d;
}
}
static int m_config_set_obj_params(struct m_config *config, struct mp_log *log,
struct mpv_global *global,
struct m_obj_desc *desc, char **args)
{
for (int n = 0; args && args[n * 2 + 0]; n++) {
bstr opt = bstr0(args[n * 2 + 0]);
bstr val = bstr0(args[n * 2 + 1]);
if (m_config_set_option_cli(config, opt, val, 0) < 0)
return -1;
}
return 0;
}
struct m_config *m_config_from_obj_desc_and_args(void *ta_parent,
struct mp_log *log, struct mpv_global *global, struct m_obj_desc *desc,
const char *name, struct m_obj_settings *defaults, char **args)
{
struct m_config *config = m_config_from_obj_desc(ta_parent, log, desc);
for (int n = 0; defaults && defaults[n].name; n++) {
struct m_obj_settings *entry = &defaults[n];
if (name && strcmp(entry->name, name) == 0) {
if (m_config_set_obj_params(config, log, global, desc, entry->attribs) < 0)
goto error;
}
}
if (m_config_set_obj_params(config, log, global, desc, args) < 0)
goto error;
return config;
error:
talloc_free(config);
return NULL;
}
static void ensure_backup(struct m_config *config, struct m_config_option *co)
{
if (!co->data)
return;
for (struct m_opt_backup *cur = config->backup_opts; cur; cur = cur->next) {
if (cur->co->data == co->data) // comparing data ptr catches aliases
return;
}
struct m_opt_backup *bc = talloc_ptrtype(NULL, bc);
*bc = (struct m_opt_backup) {
.co = co,
.backup = talloc_zero_size(bc, co->opt->type->size),
};
m_option_copy(co->opt, bc->backup, co->data);
bc->next = config->backup_opts;
config->backup_opts = bc;
co->is_set_locally = true;
}
void m_config_restore_backups(struct m_config *config)
{
while (config->backup_opts) {
struct m_opt_backup *bc = config->backup_opts;
config->backup_opts = bc->next;
m_config_set_option_raw(config, bc->co, bc->backup, 0);
m_option_free(bc->co->opt, bc->backup);
bc->co->is_set_locally = false;
talloc_free(bc);
}
}
void m_config_backup_opt(struct m_config *config, const char *opt)
{
struct m_config_option *co = m_config_get_co(config, bstr0(opt));
if (co) {
ensure_backup(config, co);
} else {
MP_ERR(config, "Option %s not found.\n", opt);
}
}
void m_config_backup_all_opts(struct m_config *config)
{
for (int n = 0; n < config->num_opts; n++)
ensure_backup(config, &config->opts[n]);
}
static void m_config_add_option(struct m_config *config,
struct m_config_option *parent,
void *optstruct,
const void *optstruct_def,
const struct m_option *arg);
static void add_options(struct m_config *config,
struct m_config_option *parent,
void *optstruct,
const void *optstruct_def,
const struct m_option *defs)
{
for (int i = 0; defs && defs[i].name; i++)
m_config_add_option(config, parent, optstruct, optstruct_def, &defs[i]);
}
static void add_sub_options(struct m_config *config,
struct m_config_option *parent,
const struct m_sub_options *subopts)
{
// Can't be used multiple times.
for (int n = 0; n < config->num_groups; n++)
assert(config->groups[n].group != subopts);
// You can only use UPDATE_ flags here.
assert(!(subopts->change_flags & ~(unsigned)UPDATE_OPTS_MASK));
void *new_optstruct = NULL;
if (config->optstruct) { // only if not noalloc
new_optstruct = talloc_zero_size(config, subopts->size);
if (subopts->defaults)
memcpy(new_optstruct, subopts->defaults, subopts->size);
}
if (parent && parent->data)
substruct_write_ptr(parent->data, new_optstruct);
const void *new_optstruct_def = NULL;
if (parent && parent->default_data)
new_optstruct_def = substruct_read_ptr(parent->default_data);
if (!new_optstruct_def)
new_optstruct_def = subopts->defaults;
int group = config->num_groups++;
MP_TARRAY_GROW(config, config->groups, group);
config->groups[group] = (struct m_config_group){
.group = subopts,
.parent_group = parent ? parent->group : 0,
.opts = new_optstruct,
};
struct m_config_option next = {
.name = "",
.group = group,
};
if (parent && parent->name && parent->name[0])
next.name = parent->name;
if (subopts->prefix && subopts->prefix[0]) {
assert(next.name);
next.name = subopts->prefix;
}
add_options(config, &next, new_optstruct, new_optstruct_def, subopts->opts);
}
#define MAX_VO_AO 16
struct group_entry {
const struct m_obj_list *entry;
struct m_sub_options subs[MAX_VO_AO];
bool initialized;
};
static struct group_entry g_groups[2]; // limited by max. m_obj_list overall
static int g_num_groups = 0;
static pthread_mutex_t g_group_mutex = PTHREAD_MUTEX_INITIALIZER;
static const struct m_sub_options *get_cached_group(const struct m_obj_list *list,
int n, struct m_sub_options *v)
{
pthread_mutex_lock(&g_group_mutex);
struct group_entry *group = NULL;
for (int i = 0; i < g_num_groups; i++) {
if (g_groups[i].entry == list) {
group = &g_groups[i];
break;
}
}
if (!group) {
assert(g_num_groups < MP_ARRAY_SIZE(g_groups));
group = &g_groups[g_num_groups++];
group->entry = list;
}
if (!group->initialized) {
if (!v) {
n = -1;
group->initialized = true;
} else {
assert(n < MAX_VO_AO); // simply increase this if it fails
group->subs[n] = *v;
}
}
pthread_mutex_unlock(&g_group_mutex);
return n >= 0 ? &group->subs[n] : NULL;
}
static void init_obj_settings_list(struct m_config *config,
const struct m_obj_list *list)
{
struct m_obj_desc desc;
for (int n = 0; ; n++) {
if (!list->get_desc(&desc, n)) {
if (list->use_global_options)
get_cached_group(list, n, NULL);
break;
}
if (desc.global_opts)
add_sub_options(config, NULL, desc.global_opts);
if (list->use_global_options && desc.options) {
struct m_sub_options conf = {
.prefix = desc.options_prefix,
.opts = desc.options,
.defaults = desc.priv_defaults,
.size = desc.priv_size,
};
add_sub_options(config, NULL, get_cached_group(list, n, &conf));
}
}
}
// Initialize a field with a given value. In case this is dynamic data, it has
// to be allocated and copied. src can alias dst, also can be NULL.
static void init_opt_inplace(const struct m_option *opt, void *dst,
const void *src)
{
union m_option_value temp = {0};
if (src)
memcpy(&temp, src, opt->type->size);
memset(dst, 0, opt->type->size);
m_option_copy(opt, dst, &temp);
}
static void m_config_add_option(struct m_config *config,
struct m_config_option *parent,
void *optstruct,
const void *optstruct_def,
const struct m_option *arg)
{
assert(config != NULL);
assert(arg != NULL);
const char *parent_name = parent ? parent->name : "";
struct m_config_option co = {
.opt = arg,
.name = arg->name,
.shadow_offset = -1,
.group = parent ? parent->group : 0,
.default_data = &default_value,
.is_hidden = !!arg->deprecation_message,
};
if (arg->offset >= 0) {
if (optstruct)
co.data = (char *)optstruct + arg->offset;
if (optstruct_def)
co.default_data = (char *)optstruct_def + arg->offset;
}
if (arg->defval)
co.default_data = arg->defval;
// Fill in the full name
if (!co.name[0]) {
co.name = parent_name;
} else if (parent_name[0]) {
co.name = talloc_asprintf(config, "%s-%s", parent_name, co.name);
}
if (arg->type == &m_option_type_subconfig) {
const struct m_sub_options *subopts = arg->priv;
add_sub_options(config, &co, subopts);
} else {
int size = arg->type->size;
if (optstruct && size) {
// The required alignment is unknown, so go with the maximum C
// could require. Slightly wasteful, but not that much.
int align = (size - config->shadow_size % size) % size;
co.shadow_offset = config->shadow_size + align;
config->shadow_size = co.shadow_offset + size;
}
// Initialize options
if (co.data && co.default_data)
init_opt_inplace(arg, co.data, co.default_data);
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
if (arg->type == &m_option_type_obj_settings_list)
init_obj_settings_list(config, (const struct m_obj_list *)arg->priv);
}
}
struct m_config_option *m_config_get_co_raw(const struct m_config *config,
struct bstr name)
{
if (!name.len)
return NULL;
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
struct bstr coname = bstr0(co->name);
if (bstrcmp(coname, name) == 0)
return co;
}
return NULL;
}
struct m_config_option *m_config_get_co(const struct m_config *config,
struct bstr name)
{
struct m_config_option *co = m_config_get_co_raw(config, name);
if (!co)
return NULL;
const char *prefix = config->is_toplevel ? "--" : "";
if (co->opt->type == &m_option_type_alias) {
const char *alias = (const char *)co->opt->priv;
if (co->opt->deprecation_message && !co->warning_was_printed) {
if (co->opt->deprecation_message[0]) {
MP_WARN(config, "Warning: option %s%s was replaced with "
"%s%s: %s\n", prefix, co->name, prefix, alias,
co->opt->deprecation_message);
} else {
MP_WARN(config, "Warning: option %s%s was replaced with "
"%s%s and might be removed in the future.\n",
prefix, co->name, prefix, alias);
}
co->warning_was_printed = true;
}
return m_config_get_co(config, bstr0(alias));
} else if (co->opt->type == &m_option_type_cli_alias) {
// Pretend it does not exist.
return NULL;
} else if (co->opt->type == &m_option_type_removed) {
if (!co->warning_was_printed) {
char *msg = co->opt->priv;
if (msg) {
MP_FATAL(config, "Option %s%s was removed: %s\n",
prefix, co->name, msg);
} else {
MP_FATAL(config, "Option %s%s was removed.\n",
prefix, co->name);
}
co->warning_was_printed = true;
}
return NULL;
} else if (co->opt->deprecation_message) {
if (!co->warning_was_printed) {
MP_WARN(config, "Warning: option %s%s is deprecated "
"and might be removed in the future (%s).\n",
prefix, co->name, co->opt->deprecation_message);
co->warning_was_printed = true;
}
}
return co;
}
int m_config_get_co_count(struct m_config *config)
{
return config->num_opts;
}
struct m_config_option *m_config_get_co_index(struct m_config *config, int index)
{
return &config->opts[index];
}
const char *m_config_get_positional_option(const struct m_config *config, int p)
{
int pos = 0;
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
if (!co->is_hidden) {
if (pos == p)
return co->name;
pos++;
}
}
return NULL;
}
// return: <0: M_OPT_ error, 0: skip, 1: check, 2: set
static int handle_set_opt_flags(struct m_config *config,
struct m_config_option *co, int flags)
{
int optflags = co->opt->flags;
bool set = !(flags & M_SETOPT_CHECK_ONLY);
if ((flags & M_SETOPT_PRE_PARSE_ONLY) && !(optflags & M_OPT_PRE_PARSE))
return 0;
if ((flags & M_SETOPT_PRESERVE_CMDLINE) && co->is_set_from_cmdline)
set = false;
if ((flags & M_SETOPT_NO_OVERWRITE) &&
(co->is_set_from_cmdline || co->is_set_from_config))
set = false;
if ((flags & M_SETOPT_NO_FIXED) && (optflags & M_OPT_FIXED))
return M_OPT_INVALID;
if ((flags & M_SETOPT_NO_PRE_PARSE) && (optflags & M_OPT_PRE_PARSE))
return M_OPT_INVALID;
// Check if this option isn't forbidden in the current mode
if ((flags & M_SETOPT_FROM_CONFIG_FILE) && (optflags & M_OPT_NOCFG)) {
MP_ERR(config, "The %s option can't be used in a config file.\n",
co->name);
return M_OPT_INVALID;
}
if ((flags & M_SETOPT_BACKUP) && set)
ensure_backup(config, co);
return set ? 2 : 1;
}
void m_config_mark_co_flags(struct m_config_option *co, int flags)
{
if (flags & M_SETOPT_FROM_CMDLINE)
co->is_set_from_cmdline = true;
if (flags & M_SETOPT_FROM_CONFIG_FILE)
co->is_set_from_config = true;
}
// Special options that don't really fit into the option handling mode. They
// usually store no data, but trigger actions. Caller is assumed to have called
// handle_set_opt_flags() to make sure the option can be set.
// Returns M_OPT_UNKNOWN if the option is not a special option.
static int m_config_handle_special_options(struct m_config *config,
struct m_config_option *co,
void *data, int flags)
{
if (config->use_profiles && strcmp(co->name, "profile") == 0) {
char **list = *(char ***)data;
if (list && list[0] && !list[1] && strcmp(list[0], "help") == 0) {
if (!config->profiles) {
MP_INFO(config, "No profiles have been defined.\n");
return M_OPT_EXIT;
}
MP_INFO(config, "Available profiles:\n");
for (struct m_profile *p = config->profiles; p; p = p->next)
MP_INFO(config, "\t%s\t%s\n", p->name, p->desc ? p->desc : "");
MP_INFO(config, "\n");
return M_OPT_EXIT;
}
for (int n = 0; list && list[n]; n++) {
int r = m_config_set_profile(config, list[n], flags);
if (r < 0)
return r;
}
return 0;
}
if (config->includefunc && strcmp(co->name, "include") == 0) {
char *param = *(char **)data;
if (!param || !param[0])
return M_OPT_MISSING_PARAM;
if (config->recursion_depth >= MAX_RECURSION_DEPTH) {
MP_ERR(config, "Maximum 'include' nesting depth exceeded.\n");
return M_OPT_INVALID;
}
config->recursion_depth += 1;
config->includefunc(config->includefunc_ctx, param, flags);
config->recursion_depth -= 1;
if (config->recursion_depth == 0 && config->profile_depth == 0)
m_config_finish_default_profile(config, flags);
return 1;
}
if (config->use_profiles && strcmp(co->name, "show-profile") == 0)
return show_profile(config, bstr0(*(char **)data));
if (config->is_toplevel && (strcmp(co->name, "h") == 0 ||
strcmp(co->name, "help") == 0))
{
char *h = *(char **)data;
mp_info(config->log, "%s", mp_help_text);
if (h && h[0])
m_config_print_option_list(config, h);
return M_OPT_EXIT;
}
if (strcmp(co->name, "list-options") == 0) {
m_config_print_option_list(config, "*");
return M_OPT_EXIT;
}
return M_OPT_UNKNOWN;
}
// Unlike m_config_set_option_raw() this does not go through the property layer
// via config.option_set_callback.
int m_config_set_option_raw_direct(struct m_config *config,
struct m_config_option *co,
void *data, int flags)
{
if (!co)
return M_OPT_UNKNOWN;
int r = handle_set_opt_flags(config, co, flags);
if (r <= 1)
return r;
r = m_config_handle_special_options(config, co, data, flags);
if (r != M_OPT_UNKNOWN)
return r;
// This affects some special options like "playlist", "v". Maybe these
// should work, or maybe not. For now they would require special code.
if (!co->data)
return flags & M_SETOPT_FROM_CMDLINE ? 0 : M_OPT_UNKNOWN;
m_option_copy(co->opt, co->data, data);
m_config_mark_co_flags(co, flags);
m_config_notify_change_co(config, co);
return 0;
}
// Similar to m_config_set_option_cli(), but set as data in its native format.
// This takes care of some details like sending change notifications.
// The type data points to is as in: co->opt
int m_config_set_option_raw(struct m_config *config, struct m_config_option *co,
void *data, int flags)
{
if (!co)
return M_OPT_UNKNOWN;
if (config->option_set_callback) {
int r = handle_set_opt_flags(config, co, flags);
if (r <= 1)
return r;
return config->option_set_callback(config->option_set_callback_cb,
co, data, flags);
} else {
return m_config_set_option_raw_direct(config, co, data, flags);
}
}
// Handle CLI exceptions to option handling.
// Used to turn "--no-foo" into "--foo=no".
// It also handles looking up "--vf-add" as "--vf".
static struct m_config_option *m_config_mogrify_cli_opt(struct m_config *config,
struct bstr *name,
bool *out_negate,
int *out_add_flags)
{
*out_negate = false;
*out_add_flags = 0;
struct m_config_option *co = m_config_get_co(config, *name);
if (co)
return co;
// Turn "--no-foo" into "foo" + set *out_negate.
if (!co && bstr_eatstart0(name, "no-")) {
co = m_config_get_co(config, *name);
// Not all choice types have this value - if they don't, then parsing
// them will simply result in an error. Good enough.
if (co && co->opt->type != CONF_TYPE_FLAG &&
co->opt->type != CONF_TYPE_CHOICE &&
co->opt->type != &m_option_type_aspect)
return NULL;
*out_negate = true;
return co;
}
// Resolve CLI alias. (We don't allow you to combine them with "--no-".)
co = m_config_get_co_raw(config, *name);
if (co && co->opt->type == &m_option_type_cli_alias)
*name = bstr0((char *)co->opt->priv);
// Might be a suffix "action", like "--vf-add". Expensively check for
// matches. (We don't allow you to combine them with "--no-".)
for (int n = 0; n < config->num_opts; n++) {
co = &config->opts[n];
const struct m_option_type *type = co->opt->type;
struct bstr coname = bstr0(co->name);
if (!bstr_startswith(*name, coname))
continue;
for (int i = 0; type->actions && type->actions[i].name; i++) {
const struct m_option_action *action = &type->actions[i];
bstr suffix = bstr0(action->name);
if (bstr_endswith(*name, suffix) &&
(name->len == coname.len + 1 + suffix.len) &&
name->start[coname.len] == '-')
{
*out_add_flags = action->flags;
return co;
}
}
}
return NULL;
}
// Set the named option to the given string. This is for command line and config
// file use only.
// flags: combination of M_SETOPT_* flags (0 for normal operation)
// Returns >= 0 on success, otherwise see OptionParserReturn.
int m_config_set_option_cli(struct m_config *config, struct bstr name,
struct bstr param, int flags)
{
int r;
assert(config != NULL);
bool negate;
struct m_config_option *co =
m_config_mogrify_cli_opt(config, &name, &negate, &(int){0});
if (!co) {
r = M_OPT_UNKNOWN;
goto done;
}
if (negate) {
if (param.len) {
r = M_OPT_DISALLOW_PARAM;
goto done;
}
param = bstr0("no");
}
// This is the only mandatory function
assert(co->opt->type->parse);
r = handle_set_opt_flags(config, co, flags);
if (r <= 0)
goto done;
if (r == 2) {
MP_VERBOSE(config, "Setting option '%.*s' = '%.*s' (flags = %d)\n",
BSTR_P(name), BSTR_P(param), flags);
}
union m_option_value val = {0};
// Some option types are "impure" and work on the existing data.
// (Prime examples: --vf-add, --sub-file)
if (co->data)
m_option_copy(co->opt, &val, co->data);
r = m_option_parse(config->log, co->opt, name, param, &val);
if (r >= 0)
r = m_config_set_option_raw(config, co, &val, flags);
m_option_free(co->opt, &val);
done:
if (r < 0 && r != M_OPT_EXIT) {
MP_ERR(config, "Error parsing option %.*s (%s)\n",
BSTR_P(name), m_option_strerror(r));
r = M_OPT_INVALID;
}
return r;
}
int m_config_set_option_node(struct m_config *config, bstr name,
struct mpv_node *data, int flags)
{
int r;
struct m_config_option *co = m_config_get_co(config, name);
if (!co)
return M_OPT_UNKNOWN;
// Do this on an "empty" type to make setting the option strictly overwrite
// the old value, as opposed to e.g. appending to lists.
union m_option_value val = {0};
if (data->format == MPV_FORMAT_STRING) {
bstr param = bstr0(data->u.string);
r = m_option_parse(mp_null_log, co->opt, name, param, &val);
} else {
r = m_option_set_node(co->opt, &val, data);
}
if (r >= 0)
r = m_config_set_option_raw(config, co, &val, flags);
if (mp_msg_test(config->log, MSGL_V)) {
char *s = m_option_type_node.print(NULL, data);
MP_VERBOSE(config, "Setting option '%.*s' = %s (flags = %d) -> %d\n",
BSTR_P(name), s ? s : "?", flags, r);
talloc_free(s);
}
m_option_free(co->opt, &val);
return r;
}
int m_config_option_requires_param(struct m_config *config, bstr name)
{
bool negate;
int flags;
struct m_config_option *co =
m_config_mogrify_cli_opt(config, &name, &negate, &flags);
if (!co)
return M_OPT_UNKNOWN;
if (negate || (flags & M_OPT_TYPE_OPTIONAL_PARAM))
return 0;
return m_option_required_params(co->opt);
}
static int sort_opt_compare(const void *pa, const void *pb)
{
const struct m_config_option *a = pa;
const struct m_config_option *b = pb;
return strcasecmp(a->name, b->name);
}
void m_config_print_option_list(const struct m_config *config, const char *name)
{
char min[50], max[50];
int count = 0;
const char *prefix = config->is_toplevel ? "--" : "";
struct m_config_option *sorted =
talloc_memdup(NULL, config->opts, config->num_opts * sizeof(sorted[0]));
if (config->is_toplevel)
qsort(sorted, config->num_opts, sizeof(sorted[0]), sort_opt_compare);
MP_INFO(config, "Options:\n\n");
for (int i = 0; i < config->num_opts; i++) {
struct m_config_option *co = &sorted[i];
const struct m_option *opt = co->opt;
if (co->is_hidden)
continue;
if (strcmp(name, "*") != 0 && !strstr(co->name, name))
continue;
MP_INFO(config, " %s%-30s", prefix, co->name);
if (opt->type == &m_option_type_choice) {
MP_INFO(config, " Choices:");
struct m_opt_choice_alternatives *alt = opt->priv;
for (int n = 0; alt[n].name; n++)
MP_INFO(config, " %s", alt[n].name);
if (opt->flags & (M_OPT_MIN | M_OPT_MAX))
MP_INFO(config, " (or an integer)");
} else {
MP_INFO(config, " %s", opt->type->name);
}
if (opt->flags & (M_OPT_MIN | M_OPT_MAX)) {
snprintf(min, sizeof(min), "any");
snprintf(max, sizeof(max), "any");
if (opt->flags & M_OPT_MIN)
snprintf(min, sizeof(min), "%.14g", opt->min);
if (opt->flags & M_OPT_MAX)
snprintf(max, sizeof(max), "%.14g", opt->max);
MP_INFO(config, " (%s to %s)", min, max);
}
char *def = NULL;
if (co->default_data)
def = m_option_print(opt, co->default_data);
if (def) {
MP_INFO(config, " (default: %s)", def);
talloc_free(def);
}
if (opt->flags & M_OPT_NOCFG)
MP_INFO(config, " [not in config files]");
if (opt->flags & M_OPT_FILE)
MP_INFO(config, " [file]");
if (opt->flags & M_OPT_FIXED)
MP_INFO(config, " [no runtime changes]");
if (opt->type == &m_option_type_alias)
MP_INFO(config, " for %s", (char *)opt->priv);
if (opt->type == &m_option_type_cli_alias)
MP_INFO(config, " for %s (CLI/config files only)", (char *)opt->priv);
MP_INFO(config, "\n");
for (int n = 0; opt->type->actions && opt->type->actions[n].name; n++) {
const struct m_option_action *action = &opt->type->actions[n];
MP_INFO(config, " %s%s-%s\n", prefix, co->name, action->name);
count++;
}
count++;
}
MP_INFO(config, "\nTotal: %d options\n", count);
talloc_free(sorted);
}
char **m_config_list_options(void *ta_parent, const struct m_config *config)
{
char **list = talloc_new(ta_parent);
int count = 0;
for (int i = 0; i < config->num_opts; i++) {
struct m_config_option *co = &config->opts[i];
if (co->is_hidden)
continue;
// For use with CONF_TYPE_STRING_LIST, it's important not to set list
// as allocation parent.
char *s = talloc_strdup(ta_parent, co->name);
MP_TARRAY_APPEND(ta_parent, list, count, s);
}
MP_TARRAY_APPEND(ta_parent, list, count, NULL);
return list;
}
struct m_profile *m_config_get_profile(const struct m_config *config, bstr name)
{
for (struct m_profile *p = config->profiles; p; p = p->next) {
if (bstr_equals0(name, p->name))
return p;
}
return NULL;
}
struct m_profile *m_config_get_profile0(const struct m_config *config,
char *name)
{
return m_config_get_profile(config, bstr0(name));
}
struct m_profile *m_config_add_profile(struct m_config *config, char *name)
{
if (!name || !name[0])
name = "default";
struct m_profile *p = m_config_get_profile0(config, name);
if (p)
return p;
p = talloc_zero(config, struct m_profile);
p->name = talloc_strdup(p, name);
p->next = config->profiles;
config->profiles = p;
return p;
}
void m_profile_set_desc(struct m_profile *p, bstr desc)
{
talloc_free(p->desc);
p->desc = bstrto0(p, desc);
}
int m_config_set_profile_option(struct m_config *config, struct m_profile *p,
bstr name, bstr val)
{
int i = m_config_set_option_cli(config, name, val,
M_SETOPT_CHECK_ONLY |
M_SETOPT_FROM_CONFIG_FILE);
if (i < 0)
return i;
p->opts = talloc_realloc(p, p->opts, char *, 2 * (p->num_opts + 2));
p->opts[p->num_opts * 2] = bstrto0(p, name);
p->opts[p->num_opts * 2 + 1] = bstrto0(p, val);
p->num_opts++;
p->opts[p->num_opts * 2] = p->opts[p->num_opts * 2 + 1] = NULL;
return 1;
}
int m_config_set_profile(struct m_config *config, char *name, int flags)
{
struct m_profile *p = m_config_get_profile0(config, name);
if (!p) {
MP_WARN(config, "Unknown profile '%s'.\n", name);
return M_OPT_INVALID;
}
if (config->profile_depth > MAX_PROFILE_DEPTH) {
MP_WARN(config, "WARNING: Profile inclusion too deep.\n");
return M_OPT_INVALID;
}
config->profile_depth++;
for (int i = 0; i < p->num_opts; i++) {
m_config_set_option_cli(config,
bstr0(p->opts[2 * i]),
bstr0(p->opts[2 * i + 1]),
flags | M_SETOPT_FROM_CONFIG_FILE);
}
config->profile_depth--;
return 0;
}
void m_config_finish_default_profile(struct m_config *config, int flags)
{
struct m_profile *p = m_config_add_profile(config, NULL);
m_config_set_profile(config, p->name, flags);
p->num_opts = 0;
}
struct mpv_node m_config_get_profiles(struct m_config *config)
{
struct mpv_node root;
node_init(&root, MPV_FORMAT_NODE_ARRAY, NULL);
for (m_profile_t *profile = config->profiles; profile; profile = profile->next)
{
struct mpv_node *entry = node_array_add(&root, MPV_FORMAT_NODE_MAP);
node_map_add_string(entry, "name", profile->name);
if (profile->desc)
node_map_add_string(entry, "profile-desc", profile->desc);
struct mpv_node *opts =
node_map_add(entry, "options", MPV_FORMAT_NODE_ARRAY);
for (int n = 0; n < profile->num_opts; n++) {
struct mpv_node *opt_entry = node_array_add(opts, MPV_FORMAT_NODE_MAP);
node_map_add_string(opt_entry, "key", profile->opts[n * 2 + 0]);
node_map_add_string(opt_entry, "value", profile->opts[n * 2 + 1]);
}
}
return root;
}
void m_config_create_shadow(struct m_config *config)
{
assert(config->global && config->options && config->size);
assert(!config->shadow && !config->global->config);
config->shadow = talloc_zero(config, struct m_config_shadow);
config->shadow->data = talloc_zero_size(config->shadow, config->shadow_size);
config->shadow->root = config;
pthread_mutex_init(&config->shadow->lock, NULL);
config->global->config = config->shadow;
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
if (co->shadow_offset < 0)
continue;
m_option_copy(co->opt, config->shadow->data + co->shadow_offset, co->data);
}
}
// Return whether parent is a parent of group. Also returns true if they're equal.
static bool is_group_included(struct m_config *config, int group, int parent)
{
for (;;) {
if (group == parent)
return true;
if (group < 0)
break;
group = config->groups[group].parent_group;
}
return false;
}
static void cache_destroy(void *p)
{
struct m_config_cache *cache = p;
// (technically speaking, being able to call them both without anything
// breaking is a feature provided by these functions)
m_config_cache_set_wakeup_cb(cache, NULL, NULL);
m_config_cache_set_dispatch_change_cb(cache, NULL, NULL, NULL);
}
struct m_config_cache *m_config_cache_alloc(void *ta_parent,
struct mpv_global *global,
const struct m_sub_options *group)
{
struct m_config_shadow *shadow = global->config;
struct m_config *root = shadow->root;
struct m_config_cache *cache = talloc_zero(ta_parent, struct m_config_cache);
talloc_set_destructor(cache, cache_destroy);
cache->shadow = shadow;
cache->shadow_config = m_config_new(cache, mp_null_log, root->size,
root->defaults, root->options);
struct m_config *config = cache->shadow_config;
assert(config->num_opts == root->num_opts);
for (int n = 0; n < root->num_opts; n++) {
assert(config->opts[n].opt->type == root->opts[n].opt->type);
assert(config->opts[n].shadow_offset == root->opts[n].shadow_offset);
}
cache->ts = -1;
cache->group = -1;
for (int n = 0; n < config->num_groups; n++) {
if (config->groups[n].group == group) {
cache->opts = config->groups[n].opts;
cache->group = n;
break;
}
}
assert(cache->group >= 0);
assert(cache->opts);
// If we're not on the top-level, restrict set of options to the sub-group
// to reduce update costs. (It would be better not to add them in the first
// place.)
if (cache->group > 0) {
int num_opts = config->num_opts;
config->num_opts = 0;
for (int n = 0; n < num_opts; n++) {
struct m_config_option *co = &config->opts[n];
if (is_group_included(config, co->group, cache->group)) {
config->opts[config->num_opts++] = *co;
} else {
m_option_free(co->opt, co->data);
}
}
for (int n = 0; n < config->num_groups; n++) {
if (!is_group_included(config, n, cache->group))
TA_FREEP(&config->groups[n].opts);
}
}
m_config_cache_update(cache);
return cache;
}
bool m_config_cache_update(struct m_config_cache *cache)
{
struct m_config_shadow *shadow = cache->shadow;
// Using atomics and checking outside of the lock - it's unknown whether
// this makes it faster or slower. Just cargo culting it.
if (atomic_load(&shadow->root->groups[cache->group].ts) <= cache->ts)
return false;
pthread_mutex_lock(&shadow->lock);
cache->ts = atomic_load(&shadow->root->groups[cache->group].ts);
for (int n = 0; n < cache->shadow_config->num_opts; n++) {
struct m_config_option *co = &cache->shadow_config->opts[n];
if (co->shadow_offset >= 0)
m_option_copy(co->opt, co->data, shadow->data + co->shadow_offset);
}
pthread_mutex_unlock(&shadow->lock);
return true;
}
void m_config_notify_change_co(struct m_config *config,
struct m_config_option *co)
{
struct m_config_shadow *shadow = config->shadow;
if (shadow) {
pthread_mutex_lock(&shadow->lock);
if (co->shadow_offset >= 0)
m_option_copy(co->opt, shadow->data + co->shadow_offset, co->data);
pthread_mutex_unlock(&shadow->lock);
}
int changed = co->opt->flags & UPDATE_OPTS_MASK;
int group = co->group;
while (group >= 0) {
struct m_config_group *g = &config->groups[group];
atomic_fetch_add(&g->ts, 1);
if (g->group)
changed |= g->group->change_flags;
group = g->parent_group;
}
if (shadow) {
pthread_mutex_lock(&shadow->lock);
for (int n = 0; n < shadow->num_listeners; n++) {
struct m_config_cache *cache = shadow->listeners[n];
if (cache->wakeup_cb)
cache->wakeup_cb(cache->wakeup_cb_ctx);
}
pthread_mutex_unlock(&shadow->lock);
}
if (config->option_change_callback) {
config->option_change_callback(config->option_change_callback_ctx, co,
changed);
}
}
void m_config_cache_set_wakeup_cb(struct m_config_cache *cache,
void (*cb)(void *ctx), void *cb_ctx)
{
struct m_config_shadow *shadow = cache->shadow;
pthread_mutex_lock(&shadow->lock);
if (cache->in_list) {
for (int n = 0; n < shadow->num_listeners; n++) {
if (shadow->listeners[n] == cache)
MP_TARRAY_REMOVE_AT(shadow->listeners, shadow->num_listeners, n);
}
if (!shadow->num_listeners) {
talloc_free(shadow->listeners);
shadow->listeners = NULL;
}
}
if (cb) {
MP_TARRAY_APPEND(NULL, shadow->listeners, shadow->num_listeners, cache);
cache->in_list = true;
cache->wakeup_cb = cb;
cache->wakeup_cb_ctx = cb_ctx;
}
pthread_mutex_unlock(&shadow->lock);
}
static void dispatch_notify(void *p)
{
struct m_config_cache *cache = p;
assert(cache->wakeup_dispatch_queue);
mp_dispatch_enqueue_notify(cache->wakeup_dispatch_queue,
cache->wakeup_dispatch_cb,
cache->wakeup_dispatch_cb_ctx);
}
void m_config_cache_set_dispatch_change_cb(struct m_config_cache *cache,
struct mp_dispatch_queue *dispatch,
void (*cb)(void *ctx), void *cb_ctx)
{
// Remove the old one is tricky. Firts make sure no new notifications will
// come.
m_config_cache_set_wakeup_cb(cache, NULL, NULL);
// Remove any pending notifications (assume we're on the same thread as
// any potential mp_dispatch_queue_process() callers).
if (cache->wakeup_dispatch_queue) {
mp_dispatch_cancel_fn(cache->wakeup_dispatch_queue,
cache->wakeup_dispatch_cb,
cache->wakeup_dispatch_cb_ctx);
}
cache->wakeup_dispatch_queue = NULL;
cache->wakeup_dispatch_cb = NULL;
cache->wakeup_dispatch_cb_ctx = NULL;
if (cb) {
cache->wakeup_dispatch_queue = dispatch;
cache->wakeup_dispatch_cb = cb;
cache->wakeup_dispatch_cb_ctx = cb_ctx;
m_config_cache_set_wakeup_cb(cache, dispatch_notify, cache);
}
}
bool m_config_is_in_group(struct m_config *config,
const struct m_sub_options *group,
struct m_config_option *co)
{
for (int n = 0; n < config->num_groups; n++) {
if (config->groups[n].group == group)
return is_group_included(config, co->group, n);
}
return false;
}
void *mp_get_config_group(void *ta_parent, struct mpv_global *global,
const struct m_sub_options *group)
{
assert(ta_parent); // without you'd necessarily leak memory
struct m_config_cache *cache = m_config_cache_alloc(ta_parent, global, group);
return cache->opts;
}
void mp_read_option_raw(struct mpv_global *global, const char *name,
const struct m_option_type *type, void *dst)
{
struct m_config_shadow *shadow = global->config;
struct m_config_option *co = m_config_get_co(shadow->root, bstr0(name));
assert(co);
assert(co->shadow_offset >= 0);
assert(co->opt->type == type);
memset(dst, 0, co->opt->type->size);
m_option_copy(co->opt, dst, shadow->data + co->shadow_offset);
}
struct m_config *mp_get_root_config(struct mpv_global *global)
{
return global->config->root;
}
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