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mpv/mpvcore/m_property.c

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/// \file
/// \ingroup Properties
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include <libavutil/common.h>
#include "talloc.h"
#include "mpvcore/m_option.h"
#include "m_property.h"
#include "mpvcore/mp_msg.h"
#include "mpvcore/mp_common.h"
const struct m_option_type m_option_type_dummy = {
.name = "Unknown",
.flags = M_OPT_TYPE_ALLOW_WILDCARD, // make "vf*" property work
};
struct legacy_prop {
const char *old, *new;
};
static const struct legacy_prop legacy_props[] = {
{"switch_video", "video"},
{"switch_audio", "audio"},
{"switch_program", "program"},
{"framedropping", "framedrop"},
{"osdlevel", "osd-level"},
{0}
};
static bool translate_legacy_property(const char *name, char *buffer,
size_t buffer_size)
{
if (strlen(name) + 1 > buffer_size)
return false;
const char *old_name = name;
for (int n = 0; legacy_props[n].new; n++) {
if (strcmp(name, legacy_props[n].old) == 0) {
name = legacy_props[n].new;
break;
}
}
snprintf(buffer, buffer_size, "%s", name);
// Old names used "_" instead of "-"
for (int n = 0; buffer[n]; n++) {
if (buffer[n] == '_')
buffer[n] = '-';
}
if (strcmp(old_name, buffer) != 0) {
mp_msg(MSGT_CPLAYER, MSGL_WARN, "Warning: property '%s' is deprecated, "
"replaced with '%s'. Fix your input.conf!\n", old_name, buffer);
}
return true;
}
static int do_action(const m_option_t *prop_list, const char *name,
int action, void *arg, void *ctx)
{
const char *sep;
const m_option_t *prop;
struct m_property_action_arg ka;
if ((sep = strchr(name, '/')) && sep[1]) {
int len = sep - name;
char base[len + 1];
memcpy(base, name, len);
base[len] = 0;
prop = m_option_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_option_list_find(prop_list, name);
if (!prop)
return M_PROPERTY_UNKNOWN;
int (*control)(const m_option_t*, int, void*, void*) = prop->p;
int r = control(prop, action, arg, ctx);
if (action == M_PROPERTY_GET_TYPE && r < 0 &&
prop->type != &m_option_type_dummy)
{
*(struct m_option *)arg = *prop;
return M_PROPERTY_OK;
}
return r;
}
int m_property_do(const m_option_t *prop_list, const char *in_name,
int action, void *arg, void *ctx)
{
union m_option_value val = {0};
int r;
char name[64];
if (!translate_legacy_property(in_name, name, sizeof(name)))
return M_PROPERTY_UNKNOWN;
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_PRINT: {
if ((r = do_action(prop_list, name, M_PROPERTY_PRINT, 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);
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: {
// (reject 0 return value: success, but empty string with flag)
if (m_option_parse(&opt, bstr0(name), bstr0(arg), &val) <= 0)
return M_PROPERTY_ERROR;
r = do_action(prop_list, name, M_PROPERTY_SET, &val, ctx);
m_option_free(&opt, &val);
return r;
}
case M_PROPERTY_SWITCH: {
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
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_SET: {
if (!opt.type->clamp) {
mp_msg(MSGT_CPLAYER, MSGL_WARN, "Property '%s' without clamp().\n",
name);
} else {
m_option_copy(&opt, &val, arg);
r = opt.type->clamp(&opt, arg);
m_option_free(&opt, &val);
if (r != 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR,
"Property '%s': invalid value.\n", name);
return M_PROPERTY_ERROR;
}
}
return do_action(prop_list, name, M_PROPERTY_SET, arg, ctx);
}
default:
return do_action(prop_list, name, action, arg, ctx);
}
}
static int m_property_do_bstr(const m_option_t *prop_list, bstr name,
int action, void *arg, void *ctx)
{
char name0[64];
if (name.len >= sizeof(name0))
return M_PROPERTY_UNKNOWN;
snprintf(name0, sizeof(name0), "%.*s", BSTR_P(name));
return m_property_do(prop_list, name0, action, arg, ctx);
}
static void append_str(char **s, int *len, bstr append)
{
MP_TARRAY_GROW(NULL, *s, *len + append.len);
memcpy(*s + *len, append.start, append.len);
*len = *len + append.len;
}
static int expand_property(const m_option_t *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, "=");
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;
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 m_option_t *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);
while (str.len) {
if (level > 0 && bstr_eatstart0(&str, "}")) {
if (skip && level <= skip_level)
skip = false;
level--;
} else if (bstr_startswith0(str, "${") && bstr_find0(str, "}") >= 0) {
str = bstr_cut(str, 2);
level++;
// Assume ":" and "}" can't be part of the property name
// => if ":" comes before "}", it must be for the fallback
int term_pos = bstrcspn(str, ":}");
bstr name = bstr_splice(str, 0, term_pos < 0 ? str.len : term_pos);
str = bstr_cut(str, term_pos);
bool have_fallback = bstr_eatstart0(&str, ":");
if (!skip) {
skip = expand_property(prop_list, &ret, &ret_len, name,
have_fallback, ctx);
if (skip)
skip_level = level;
}
} else if (level == 0 && bstr_eatstart0(&str, "$>")) {
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(const m_option_t *list)
{
char min[50], max[50];
int i, count = 0;
mp_tmsg(MSGT_CFGPARSER, MSGL_INFO,
"\n Name Type Min Max\n\n");
for (i = 0; list[i].name; i++) {
const m_option_t *opt = &list[i];
if (opt->flags & M_OPT_MIN)
sprintf(min, "%-8.0f", opt->min);
else
strcpy(min, "No");
if (opt->flags & M_OPT_MAX)
sprintf(max, "%-8.0f", opt->max);
else
strcpy(max, "No");
mp_msg(MSGT_CFGPARSER, MSGL_INFO,
" %-20.20s %-15.15s %-10.10s %-10.10s\n",
opt->name,
opt->type->name,
min,
max);
count++;
}
mp_tmsg(MSGT_CFGPARSER, MSGL_INFO, "\nTotal: %d properties\n", count);
}
int m_property_int_ro(const m_option_t *prop, int action,
void *arg, int var)
{
if (action == M_PROPERTY_GET) {
*(int *)arg = var;
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_int64_ro(const struct m_option* prop, int action, void* arg,
int64_t var)
{
if (action == M_PROPERTY_GET) {
*(int64_t *)arg = var;
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_float_ro(const m_option_t *prop, int action,
void *arg, float var)
{
if (action == M_PROPERTY_GET) {
*(float *)arg = var;
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_double_ro(const m_option_t *prop, int action,
void *arg, double var)
{
if (action == M_PROPERTY_GET) {
*(double *)arg = var;
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
int m_property_strdup_ro(const struct m_option* prop, int action, void* arg,
const char *var)
{
if (action == M_PROPERTY_GET) {
if (!var)
return M_PROPERTY_UNAVAILABLE;
*(char **)arg = talloc_strdup(NULL, var);
return M_PROPERTY_OK;
}
return M_PROPERTY_NOT_IMPLEMENTED;
}
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