mirror of
https://github.com/mpv-player/mpv.git
synced 2024-09-20 20:03:10 +02:00
5bf473d5ca
This implements the JSON IPC protocol with named pipes, which are probably the closest Windows equivalent to Unix domain sockets in terms of functionality. Like with Unix sockets, this will allow mpv to listen for IPC connections and handle multiple IPC clients at once. A few cross platform libraries and frameworks (Qt, node.js) use named pipes for IPC on Windows and Unix sockets on Linux and Unix, so hopefully this will ease the creation of portable JSON IPC clients. Unlike the Unix implementation, this doesn't share code with --input-file, meaning --input-file on Windows won't understand JSON commands (yet.) Sharing code and removing the separate implementation in pipe-win32.c is definitely a possible future improvement.
484 lines
15 KiB
C
484 lines
15 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "common/msg.h"
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#include "input/input.h"
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#include "misc/json.h"
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#include "options/m_option.h"
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#include "options/options.h"
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#include "options/path.h"
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#include "player/client.h"
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static mpv_node *mpv_node_map_get(mpv_node *src, const char *key)
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{
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if (src->format != MPV_FORMAT_NODE_MAP)
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return NULL;
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for (int i = 0; i < src->u.list->num; i++)
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if (!strcmp(key, src->u.list->keys[i]))
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return &src->u.list->values[i];
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return NULL;
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}
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static mpv_node *mpv_node_array_get(mpv_node *src, int index)
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{
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if (src->format != MPV_FORMAT_NODE_ARRAY)
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return NULL;
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if (src->u.list->num < (index + 1))
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return NULL;
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return &src->u.list->values[index];
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}
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static void mpv_node_array_add(void *ta_parent, mpv_node *src, mpv_node *val)
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{
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if (src->format != MPV_FORMAT_NODE_ARRAY)
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return;
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if (!src->u.list)
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src->u.list = talloc_zero(ta_parent, mpv_node_list);
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MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
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static const struct m_option type = { .type = CONF_TYPE_NODE };
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m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
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src->u.list->num++;
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}
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static void mpv_node_array_add_string(void *ta_parent, mpv_node *src, const char *val)
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{
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mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char *)val};
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mpv_node_array_add(ta_parent, src, &val_node);
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}
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static void mpv_node_map_add(void *ta_parent, mpv_node *src, const char *key, mpv_node *val)
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{
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if (src->format != MPV_FORMAT_NODE_MAP)
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return;
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if (!src->u.list)
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src->u.list = talloc_zero(ta_parent, mpv_node_list);
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MP_TARRAY_GROW(src->u.list, src->u.list->keys, src->u.list->num);
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MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
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src->u.list->keys[src->u.list->num] = talloc_strdup(ta_parent, key);
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static const struct m_option type = { .type = CONF_TYPE_NODE };
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m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
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src->u.list->num++;
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}
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static void mpv_node_map_add_null(void *ta_parent, mpv_node *src, const char *key)
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{
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mpv_node val_node = {.format = MPV_FORMAT_NONE};
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mpv_node_map_add(ta_parent, src, key, &val_node);
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}
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static void mpv_node_map_add_flag(void *ta_parent, mpv_node *src, const char *key, bool val)
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{
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mpv_node val_node = {.format = MPV_FORMAT_FLAG, .u.flag = val};
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mpv_node_map_add(ta_parent, src, key, &val_node);
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}
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static void mpv_node_map_add_int64(void *ta_parent, mpv_node *src, const char *key, int64_t val)
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{
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mpv_node val_node = {.format = MPV_FORMAT_INT64, .u.int64 = val};
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mpv_node_map_add(ta_parent, src, key, &val_node);
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}
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static void mpv_node_map_add_double(void *ta_parent, mpv_node *src, const char *key, double val)
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{
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mpv_node val_node = {.format = MPV_FORMAT_DOUBLE, .u.double_ = val};
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mpv_node_map_add(ta_parent, src, key, &val_node);
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}
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static void mpv_node_map_add_string(void *ta_parent, mpv_node *src, const char *key, const char *val)
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{
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mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char*)val};
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mpv_node_map_add(ta_parent, src, key, &val_node);
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}
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static void mpv_event_to_node(void *ta_parent, mpv_event *event, mpv_node *dst)
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{
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mpv_node_map_add_string(ta_parent, dst, "event", mpv_event_name(event->event_id));
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if (event->reply_userdata)
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mpv_node_map_add_int64(ta_parent, dst, "id", event->reply_userdata);
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if (event->error < 0)
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mpv_node_map_add_string(ta_parent, dst, "error", mpv_error_string(event->error));
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switch (event->event_id) {
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case MPV_EVENT_LOG_MESSAGE: {
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mpv_event_log_message *msg = event->data;
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mpv_node_map_add_string(ta_parent, dst, "prefix", msg->prefix);
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mpv_node_map_add_string(ta_parent, dst, "level", msg->level);
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mpv_node_map_add_string(ta_parent, dst, "text", msg->text);
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break;
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}
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case MPV_EVENT_CLIENT_MESSAGE: {
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mpv_event_client_message *msg = event->data;
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mpv_node args_node = {.format = MPV_FORMAT_NODE_ARRAY, .u.list = NULL};
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for (int n = 0; n < msg->num_args; n++)
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mpv_node_array_add_string(ta_parent, &args_node, msg->args[n]);
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mpv_node_map_add(ta_parent, dst, "args", &args_node);
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break;
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}
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case MPV_EVENT_PROPERTY_CHANGE: {
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mpv_event_property *prop = event->data;
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mpv_node_map_add_string(ta_parent, dst, "name", prop->name);
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switch (prop->format) {
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case MPV_FORMAT_NODE:
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mpv_node_map_add(ta_parent, dst, "data", prop->data);
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break;
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case MPV_FORMAT_DOUBLE:
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mpv_node_map_add_double(ta_parent, dst, "data", *(double *)prop->data);
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break;
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case MPV_FORMAT_FLAG:
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mpv_node_map_add_flag(ta_parent, dst, "data", *(int *)prop->data);
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break;
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case MPV_FORMAT_STRING:
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mpv_node_map_add_string(ta_parent, dst, "data", *(char **)prop->data);
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break;
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default:
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mpv_node_map_add_null(ta_parent, dst, "data");
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}
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break;
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}
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}
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}
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char *mp_json_encode_event(mpv_event *event)
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{
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void *ta_parent = talloc_new(NULL);
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mpv_node event_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
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mpv_event_to_node(ta_parent, event, &event_node);
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char *output = talloc_strdup(NULL, "");
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json_write(&output, &event_node);
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output = ta_talloc_strdup_append(output, "\n");
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talloc_free(ta_parent);
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return output;
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}
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// Function is allowed to modify src[n].
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static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
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char *src)
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{
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int rc;
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const char *cmd = NULL;
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struct mp_log *log = mp_client_get_log(client);
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mpv_node msg_node;
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mpv_node reply_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
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mpv_node *reqid_node = NULL;
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rc = json_parse(ta_parent, &msg_node, &src, 3);
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if (rc < 0) {
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mp_err(log, "malformed JSON received\n");
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (msg_node.format != MPV_FORMAT_NODE_MAP) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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reqid_node = mpv_node_map_get(&msg_node, "request_id");
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mpv_node *cmd_node = mpv_node_map_get(&msg_node, "command");
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if (!cmd_node ||
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(cmd_node->format != MPV_FORMAT_NODE_ARRAY) ||
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!cmd_node->u.list->num)
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{
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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mpv_node *cmd_str_node = mpv_node_array_get(cmd_node, 0);
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if (!cmd_str_node || (cmd_str_node->format != MPV_FORMAT_STRING)) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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cmd = cmd_str_node->u.string;
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if (!strcmp("client_name", cmd)) {
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const char *client_name = mpv_client_name(client);
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mpv_node_map_add_string(ta_parent, &reply_node, "data", client_name);
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rc = MPV_ERROR_SUCCESS;
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} else if (!strcmp("get_time_us", cmd)) {
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int64_t time_us = mpv_get_time_us(client);
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mpv_node_map_add_int64(ta_parent, &reply_node, "data", time_us);
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rc = MPV_ERROR_SUCCESS;
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} else if (!strcmp("get_version", cmd)) {
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int64_t ver = mpv_client_api_version();
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mpv_node_map_add_int64(ta_parent, &reply_node, "data", ver);
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rc = MPV_ERROR_SUCCESS;
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} else if (!strcmp("get_property", cmd)) {
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mpv_node result_node;
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if (cmd_node->u.list->num != 2) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_get_property(client, cmd_node->u.list->values[1].u.string,
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MPV_FORMAT_NODE, &result_node);
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if (rc >= 0) {
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mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
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mpv_free_node_contents(&result_node);
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}
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} else if (!strcmp("get_property_string", cmd)) {
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if (cmd_node->u.list->num != 2) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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char *result = mpv_get_property_string(client,
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cmd_node->u.list->values[1].u.string);
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if (!result) {
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mpv_node_map_add_null(ta_parent, &reply_node, "data");
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} else {
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mpv_node_map_add_string(ta_parent, &reply_node, "data", result);
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mpv_free(result);
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}
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} else if (!strcmp("set_property", cmd)) {
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if (cmd_node->u.list->num != 3) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_set_property(client, cmd_node->u.list->values[1].u.string,
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MPV_FORMAT_NODE, &cmd_node->u.list->values[2]);
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} else if (!strcmp("set_property_string", cmd)) {
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if (cmd_node->u.list->num != 3) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_set_property_string(client,
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cmd_node->u.list->values[1].u.string,
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cmd_node->u.list->values[2].u.string);
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} else if (!strcmp("observe_property", cmd)) {
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if (cmd_node->u.list->num != 3) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_observe_property(client,
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cmd_node->u.list->values[1].u.int64,
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cmd_node->u.list->values[2].u.string,
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MPV_FORMAT_NODE);
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} else if (!strcmp("observe_property_string", cmd)) {
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if (cmd_node->u.list->num != 3) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_observe_property(client,
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cmd_node->u.list->values[1].u.int64,
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cmd_node->u.list->values[2].u.string,
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MPV_FORMAT_STRING);
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} else if (!strcmp("unobserve_property", cmd)) {
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if (cmd_node->u.list->num != 2) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_unobserve_property(client,
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cmd_node->u.list->values[1].u.int64);
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} else if (!strcmp("request_log_messages", cmd)) {
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if (cmd_node->u.list->num != 2) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_request_log_messages(client,
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cmd_node->u.list->values[1].u.string);
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} else if (!strcmp("suspend", cmd)) {
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mpv_suspend(client);
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rc = MPV_ERROR_SUCCESS;
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} else if (!strcmp("resume", cmd)) {
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mpv_resume(client);
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rc = MPV_ERROR_SUCCESS;
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} else if (!strcmp("enable_event", cmd) ||
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!strcmp("disable_event", cmd))
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{
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bool enable = !strcmp("enable_event", cmd);
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if (cmd_node->u.list->num != 2) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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char *name = cmd_node->u.list->values[1].u.string;
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if (strcmp(name, "all") == 0) {
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for (int n = 0; n < 64; n++)
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mpv_request_event(client, n, enable);
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rc = MPV_ERROR_SUCCESS;
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} else {
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int event = -1;
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for (int n = 0; n < 64; n++) {
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const char *evname = mpv_event_name(n);
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if (evname && strcmp(evname, name) == 0)
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event = n;
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}
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if (event < 0) {
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rc = MPV_ERROR_INVALID_PARAMETER;
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goto error;
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}
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rc = mpv_request_event(client, event, enable);
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}
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} else {
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mpv_node result_node;
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rc = mpv_command_node(client, cmd_node, &result_node);
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if (rc >= 0)
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mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
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}
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error:
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/* If the request contains a "request_id", copy it back into the response.
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* This makes it easier on the requester to match up the IPC results with
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* the original requests.
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*/
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if (reqid_node) {
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mpv_node_map_add(ta_parent, &reply_node, "request_id", reqid_node);
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}
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mpv_node_map_add_string(ta_parent, &reply_node, "error", mpv_error_string(rc));
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char *output = talloc_strdup(ta_parent, "");
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json_write(&output, &reply_node);
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output = ta_talloc_strdup_append(output, "\n");
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return output;
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}
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static char *text_execute_command(struct mpv_handle *client, void *tmp, char *src)
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{
|
|
mpv_command_string(client, src);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
char *mp_ipc_consume_next_command(struct mpv_handle *client, void *ctx, bstr *buf)
|
|
{
|
|
void *tmp = talloc_new(NULL);
|
|
|
|
bstr rest;
|
|
bstr line = bstr_getline(*buf, &rest);
|
|
char *line0 = bstrto0(tmp, line);
|
|
talloc_steal(tmp, buf->start);
|
|
*buf = bstrdup(NULL, rest);
|
|
|
|
json_skip_whitespace(&line0);
|
|
|
|
char *reply_msg = NULL;
|
|
if (line0[0] == '\0' || line0[0] == '#') {
|
|
// skip
|
|
} else if (line0[0] == '{') {
|
|
reply_msg = json_execute_command(client, tmp, line0);
|
|
} else {
|
|
reply_msg = text_execute_command(client, tmp, line0);
|
|
}
|
|
|
|
talloc_steal(ctx, reply_msg);
|
|
talloc_free(tmp);
|
|
return reply_msg;
|
|
}
|