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mpv/options/m_property.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/>.
*/
/// \file
/// \ingroup Properties
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include <libavutil/common.h>
#include "libmpv/client.h"
#include "mpv_talloc.h"
#include "m_option.h"
#include "m_property.h"
#include "common/msg.h"
#include "common/common.h"
static int m_property_multiply(struct mp_log *log,
const struct m_property *prop_list,
const char *property, double f, void *ctx)
{
union m_option_value val = m_option_value_default;
struct m_option opt = {0};
int r;
r = m_property_do(log, prop_list, property, M_PROPERTY_GET_CONSTRICTED_TYPE,
&opt, ctx);
if (r != M_PROPERTY_OK)
return r;
assert(opt.type);
if (!opt.type->multiply)
return M_PROPERTY_NOT_IMPLEMENTED;
r = m_property_do(log, prop_list, property, M_PROPERTY_GET, &val, ctx);
if (r != M_PROPERTY_OK)
return r;
opt.type->multiply(&opt, &val, f);
r = m_property_do(log, prop_list, property, M_PROPERTY_SET, &val, ctx);
m_option_free(&opt, &val);
return r;
}
struct m_property *m_property_list_find(const struct m_property *list,
const char *name)
{
for (int n = 0; list && list[n].name; n++) {
if (strcmp(list[n].name, name) == 0)
return (struct m_property *)&list[n];
}
return NULL;
}
static int do_action(const struct m_property *prop_list, const char *name,
int action, void *arg, void *ctx)
{
struct m_property *prop;
struct m_property_action_arg ka;
const char *sep = strchr(name, '/');
if (sep && sep[1]) {
char base[128];
snprintf(base, sizeof(base), "%.*s", (int)(sep - name), name);
prop = m_property_list_find(prop_list, base);
ka = (struct m_property_action_arg) {
.key = sep + 1,
.action = action,
.arg = arg,
};
action = M_PROPERTY_KEY_ACTION;
arg = &ka;
} else
prop = m_property_list_find(prop_list, name);
if (!prop)
return M_PROPERTY_UNKNOWN;
return prop->call(ctx, prop, action, arg);
}
// (as a hack, log can be NULL on read-only paths)
int m_property_do(struct mp_log *log, const struct m_property *prop_list,
const char *name, int action, void *arg, void *ctx)
{
union m_option_value val = m_option_value_default;
int r;
struct m_option opt = {0};
r = do_action(prop_list, name, M_PROPERTY_GET_TYPE, &opt, ctx);
if (r <= 0)
return r;
assert(opt.type);
switch (action) {
case M_PROPERTY_FIXED_LEN_PRINT:
case M_PROPERTY_PRINT: {
if ((r = do_action(prop_list, name, action, arg, ctx)) >= 0)
return r;
// Fallback to m_option
if ((r = do_action(prop_list, name, M_PROPERTY_GET, &val, ctx)) <= 0)
return r;
char *str = m_option_pretty_print(&opt, &val, action == M_PROPERTY_FIXED_LEN_PRINT);
m_option_free(&opt, &val);
*(char **)arg = str;
return str != NULL;
}
case M_PROPERTY_GET_STRING: {
if ((r = do_action(prop_list, name, M_PROPERTY_GET, &val, ctx)) <= 0)
return r;
char *str = m_option_print(&opt, &val);
m_option_free(&opt, &val);
*(char **)arg = str;
return str != NULL;
}
case M_PROPERTY_SET_STRING: {
struct mpv_node node = { .format = MPV_FORMAT_STRING, .u.string = arg };
return m_property_do(log, prop_list, name, M_PROPERTY_SET_NODE, &node, ctx);
}
case M_PROPERTY_MULTIPLY: {
return m_property_multiply(log, prop_list, name, *(double *)arg, ctx);
}
case M_PROPERTY_SWITCH: {
if (!log)
return M_PROPERTY_ERROR;
struct m_property_switch_arg *sarg = arg;
if ((r = do_action(prop_list, name, M_PROPERTY_SWITCH, arg, ctx)) !=
M_PROPERTY_NOT_IMPLEMENTED)
return r;
// Fallback to m_option
r = m_property_do(log, prop_list, name, M_PROPERTY_GET_CONSTRICTED_TYPE,
&opt, ctx);
if (r <= 0)
return r;
assert(opt.type);
if (!opt.type->add)
return M_PROPERTY_NOT_IMPLEMENTED;
if ((r = do_action(prop_list, name, M_PROPERTY_GET, &val, ctx)) <= 0)
return r;
opt.type->add(&opt, &val, sarg->inc, sarg->wrap);
r = do_action(prop_list, name, M_PROPERTY_SET, &val, ctx);
m_option_free(&opt, &val);
return r;
}
case M_PROPERTY_GET_CONSTRICTED_TYPE: {
r = do_action(prop_list, name, action, arg, ctx);
if (r >= 0 || r == M_PROPERTY_UNAVAILABLE)
return r;
if ((r = do_action(prop_list, name, M_PROPERTY_GET_TYPE, arg, ctx)) >= 0)
return r;
return M_PROPERTY_NOT_IMPLEMENTED;
}
case M_PROPERTY_SET: {
return do_action(prop_list, name, M_PROPERTY_SET, arg, ctx);
}
case M_PROPERTY_GET_NODE: {
if ((r = do_action(prop_list, name, M_PROPERTY_GET_NODE, arg, ctx)) !=
M_PROPERTY_NOT_IMPLEMENTED)
return r;
if ((r = do_action(prop_list, name, M_PROPERTY_GET, &val, ctx)) <= 0)
return r;
struct mpv_node *node = arg;
int err = m_option_get_node(&opt, NULL, node, &val);
if (err == M_OPT_UNKNOWN) {
r = M_PROPERTY_NOT_IMPLEMENTED;
} else if (err < 0) {
r = M_PROPERTY_INVALID_FORMAT;
} else {
r = M_PROPERTY_OK;
}
m_option_free(&opt, &val);
return r;
}
case M_PROPERTY_SET_NODE: {
if (!log)
return M_PROPERTY_ERROR;
if ((r = do_action(prop_list, name, M_PROPERTY_SET_NODE, arg, ctx)) !=
M_PROPERTY_NOT_IMPLEMENTED)
return r;
int err = m_option_set_node_or_string(log, &opt, name, &val, arg);
if (err == M_OPT_UNKNOWN) {
r = M_PROPERTY_NOT_IMPLEMENTED;
} else if (err < 0) {
r = M_PROPERTY_INVALID_FORMAT;
} else {
r = do_action(prop_list, name, M_PROPERTY_SET, &val, ctx);
}
m_option_free(&opt, &val);
return r;
}
default:
return do_action(prop_list, name, action, arg, ctx);
}
}
bool m_property_split_path(const char *path, bstr *prefix, char **rem)
{
char *next = strchr(path, '/');
if (next) {
*prefix = bstr_splice(bstr0(path), 0, next - path);
*rem = next + 1;
return true;
} else {
*prefix = bstr0(path);
*rem = "";
return false;
}
}
// If *action is M_PROPERTY_KEY_ACTION, but the associated path is "", then
// make this into a top-level action.
static void m_property_unkey(int *action, void **arg)
{
if (*action == M_PROPERTY_KEY_ACTION) {
struct m_property_action_arg *ka = *arg;
if (!ka->key[0]) {
*action = ka->action;
*arg = ka->arg;
}
}
}
static int m_property_do_bstr(const struct m_property *prop_list, bstr name,
int action, void *arg, void *ctx)
{
char *name0 = bstrdup0(NULL, name);
int ret = m_property_do(NULL, prop_list, name0, action, arg, ctx);
talloc_free(name0);
return ret;
}
static void append_str(char **s, int *len, bstr append)
{
MP_TARRAY_GROW(NULL, *s, *len + append.len);
if (append.len)
memcpy(*s + *len, append.start, append.len);
*len = *len + append.len;
}
static int expand_property(const struct m_property *prop_list, char **ret,
int *ret_len, bstr prop, bool silent_error, void *ctx)
{
bool cond_yes = bstr_eatstart0(&prop, "?");
bool cond_no = !cond_yes && bstr_eatstart0(&prop, "!");
bool test = cond_yes || cond_no;
bool raw = bstr_eatstart0(&prop, "=");
bool fixed_len = !raw && bstr_eatstart0(&prop, ">");
bstr comp_with = {0};
bool comp = test && bstr_split_tok(prop, "==", &prop, &comp_with);
if (test && !comp)
raw = true;
int method = raw ? M_PROPERTY_GET_STRING : M_PROPERTY_PRINT;
method = fixed_len ? M_PROPERTY_FIXED_LEN_PRINT : method;
char *s = NULL;
int r = m_property_do_bstr(prop_list, prop, method, &s, ctx);
bool skip;
if (comp) {
skip = ((s && bstr_equals0(comp_with, s)) != cond_yes);
} else if (test) {
skip = (!!s != cond_yes);
} else {
skip = !!s;
char *append = s;
if (!s && !silent_error && !raw)
append = (r == M_PROPERTY_UNAVAILABLE) ? "(unavailable)" : "(error)";
append_str(ret, ret_len, bstr0(append));
}
talloc_free(s);
return skip;
}
char *m_properties_expand_string(const struct m_property *prop_list,
const char *str0, void *ctx)
{
char *ret = NULL;
int ret_len = 0;
bool skip = false;
int level = 0, skip_level = 0;
bstr str = bstr0(str0);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
int n = 0;
#endif
while (str.len) {
if (level > 0 && bstr_eatstart0(&str, "}")) {
if (skip && level <= skip_level)
skip = false;
level--;
} else if (bstr_startswith0(str, "${") && bstr_find0(str, "}") >= 0) {
str = bstr_cut(str, 2);
level++;
// Assume ":" and "}" can't be part of the property name
// => if ":" comes before "}", it must be for the fallback
int term_pos = bstrcspn(str, ":}");
bstr name = bstr_splice(str, 0, term_pos < 0 ? str.len : term_pos);
str = bstr_cut(str, term_pos);
bool have_fallback = bstr_eatstart0(&str, ":");
if (!skip) {
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
if (n++ > 10)
break;
#endif
skip = expand_property(prop_list, &ret, &ret_len, name,
have_fallback, ctx);
if (skip)
skip_level = level;
}
} else if (level == 0 && bstr_eatstart0(&str, "$>")) {
append_str(&ret, &ret_len, str);
break;
} else {
char c;
// Other combinations, e.g. "$x", are added verbatim
if (bstr_eatstart0(&str, "$$")) {
c = '$';
} else if (bstr_eatstart0(&str, "$}")) {
c = '}';
} else {
c = str.start[0];
str = bstr_cut(str, 1);
}
if (!skip)
MP_TARRAY_APPEND(NULL, ret, ret_len, c);
}
}
MP_TARRAY_APPEND(NULL, ret, ret_len, '\0');
return ret;
}
void m_properties_print_help_list(struct mp_log *log,
const struct m_property *list)
{
int count = 0;
mp_info(log, "Name\n\n");
for (int i = 0; list[i].name; i++) {
const struct m_property *p = &list[i];
mp_info(log, " %s\n", p->name);
count++;
}
mp_info(log, "\nTotal: %d properties\n", count);
}
int m_property_bool_ro(int action, void* arg, bool var)
{
switch (action) {
case M_PROPERTY_GET:
*(bool *)arg = !!var;
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_BOOL};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_int_ro(int action, void *arg, int var)
{
switch (action) {
case M_PROPERTY_GET:
*(int *)arg = var;
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_INT};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_int64_ro(int action, void* arg, int64_t var)
{
switch (action) {
case M_PROPERTY_GET:
*(int64_t *)arg = var;
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_INT64};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_float_ro(int action, void *arg, float var)
{
switch (action) {
case M_PROPERTY_GET:
*(float *)arg = var;
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_FLOAT};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_double_ro(int action, void *arg, double var)
{
switch (action) {
case M_PROPERTY_GET:
*(double *)arg = var;
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_DOUBLE};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_strdup_ro(int action, void* arg, const char *var)
{
if (!var)
return M_PROPERTY_UNAVAILABLE;
switch (action) {
case M_PROPERTY_GET:
*(char **)arg = talloc_strdup(NULL, var);
return M_PROPERTY_OK;
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_STRING};
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_read_sub_validate(void *ctx, struct m_property *prop,
int action, void *arg)
{
m_property_unkey(&action, &arg);
switch (action) {
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_NODE};
return M_PROPERTY_OK;
case M_PROPERTY_GET:
case M_PROPERTY_PRINT:
case M_PROPERTY_KEY_ACTION:
return M_PROPERTY_VALID;
default:
return M_PROPERTY_NOT_IMPLEMENTED;
};
}
// This allows you to make a list of values (like from a struct) available
// as a number of sub-properties. The property list is set up with the current
// property values on the stack before calling this function.
// This does not support write access.
int m_property_read_sub(const struct m_sub_property *props, int action, void *arg)
{
m_property_unkey(&action, &arg);
switch (action) {
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_NODE};
return M_PROPERTY_OK;
case M_PROPERTY_GET: {
struct mpv_node node;
node.format = MPV_FORMAT_NODE_MAP;
node.u.list = talloc_zero(NULL, mpv_node_list);
mpv_node_list *list = node.u.list;
for (int n = 0; props && props[n].name; n++) {
const struct m_sub_property *prop = &props[n];
if (prop->unavailable)
continue;
MP_TARRAY_GROW(list, list->values, list->num);
MP_TARRAY_GROW(list, list->keys, list->num);
mpv_node *val = &list->values[list->num];
if (m_option_get_node(&prop->type, list, val, (void*)&prop->value) < 0)
{
char *s = m_option_print(&prop->type, &prop->value);
val->format = MPV_FORMAT_STRING;
val->u.string = talloc_steal(list, s);
}
list->keys[list->num] = (char *)prop->name;
list->num++;
}
*(struct mpv_node *)arg = node;
return M_PROPERTY_OK;
}
case M_PROPERTY_PRINT: {
// Output "something" - what it really should return is not yet decided.
// It should probably be something that is easy to consume by slave
// mode clients. (M_PROPERTY_PRINT on the other hand can return this
// as human readable version just fine).
char *res = NULL;
for (int n = 0; props && props[n].name; n++) {
const struct m_sub_property *prop = &props[n];
if (prop->unavailable)
continue;
char *s = m_option_print(&prop->type, &prop->value);
ta_xasprintf_append(&res, "%s=%s\n", prop->name, s);
talloc_free(s);
}
*(char **)arg = res;
return M_PROPERTY_OK;
}
case M_PROPERTY_KEY_ACTION: {
struct m_property_action_arg *ka = arg;
const struct m_sub_property *prop = NULL;
for (int n = 0; props && props[n].name; n++) {
if (strcmp(props[n].name, ka->key) == 0) {
prop = &props[n];
break;
}
}
if (!prop)
return M_PROPERTY_UNKNOWN;
if (prop->unavailable)
return M_PROPERTY_UNAVAILABLE;
switch (ka->action) {
case M_PROPERTY_GET: {
memset(ka->arg, 0, prop->type.type->size);
m_option_copy(&prop->type, ka->arg, &prop->value);
return M_PROPERTY_OK;
}
case M_PROPERTY_GET_TYPE:
*(struct m_option *)ka->arg = prop->type;
return M_PROPERTY_OK;
}
}
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
// Make a list of items available as indexed sub-properties. E.g. you can access
// item 0 as "property/0", item 1 as "property/1", etc., where each of these
// properties is redirected to the get_item(0, ...), get_item(1, ...), callback.
// Additionally, the number of entries is made available as "property/count".
// action, arg: property access.
// count: number of items.
// get_item: callback to access a single item.
// ctx: userdata passed to get_item.
int m_property_read_list(int action, void *arg, int count,
m_get_item_cb get_item, void *ctx)
{
m_property_unkey(&action, &arg);
switch (action) {
case M_PROPERTY_GET_TYPE:
*(struct m_option *)arg = (struct m_option){.type = CONF_TYPE_NODE};
return M_PROPERTY_OK;
case M_PROPERTY_GET: {
struct mpv_node node;
node.format = MPV_FORMAT_NODE_ARRAY;
node.u.list = talloc_zero(NULL, mpv_node_list);
node.u.list->num = count;
node.u.list->values = talloc_array(node.u.list, mpv_node, count);
for (int n = 0; n < count; n++) {
struct mpv_node *sub = &node.u.list->values[n];
sub->format = MPV_FORMAT_NONE;
int r;
r = get_item(n, M_PROPERTY_GET_NODE, sub, ctx);
if (r == M_PROPERTY_NOT_IMPLEMENTED) {
struct m_option opt = {0};
r = get_item(n, M_PROPERTY_GET_TYPE, &opt, ctx);
if (r != M_PROPERTY_OK)
goto err;
union m_option_value val = m_option_value_default;
r = get_item(n, M_PROPERTY_GET, &val, ctx);
if (r != M_PROPERTY_OK)
goto err;
m_option_get_node(&opt, node.u.list, sub, &val);
m_option_free(&opt, &val);
err: ;
}
}
*(struct mpv_node *)arg = node;
return M_PROPERTY_OK;
}
case M_PROPERTY_PRINT: {
// See m_property_read_sub() remarks.
char *res = NULL;
for (int n = 0; n < count; n++) {
char *s = NULL;
int r = get_item(n, M_PROPERTY_PRINT, &s, ctx);
if (r != M_PROPERTY_OK) {
talloc_free(res);
return r;
}
ta_xasprintf_append(&res, "%d: %s\n", n, s);
talloc_free(s);
}
*(char **)arg = res;
return M_PROPERTY_OK;
}
case M_PROPERTY_KEY_ACTION: {
struct m_property_action_arg *ka = arg;
if (strcmp(ka->key, "count") == 0) {
switch (ka->action) {
case M_PROPERTY_GET_TYPE: {
struct m_option opt = {.type = CONF_TYPE_INT};
*(struct m_option *)ka->arg = opt;
return M_PROPERTY_OK;
}
case M_PROPERTY_GET:
*(int *)ka->arg = MPMAX(0, count);
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
// This is expected of the form "123" or "123/rest"
char *next = strchr(ka->key, '/');
char *end = NULL;
const char *key_end = ka->key + strlen(ka->key);
long int item = strtol(ka->key, &end, 10);
// not a number, trailing characters, etc.
if ((end != key_end || ka->key == key_end) && end != next)
return M_PROPERTY_UNKNOWN;
if (item < 0 || item >= count)
return M_PROPERTY_UNKNOWN;
if (next) {
// Sub-path
struct m_property_action_arg n_ka = *ka;
n_ka.key = next + 1;
return get_item(item, M_PROPERTY_KEY_ACTION, &n_ka, ctx);
} else {
// Direct query
return get_item(item, ka->action, ka->arg, ctx);
}
}
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
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