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mpv/player/client.c

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/* Copyright (C) 2017 the mpv developers
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdatomic.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "common/global.h"
#include "input/input.h"
#include "input/cmd.h"
#include "misc/ctype.h"
#include "misc/dispatch.h"
#include "misc/node.h"
#include "misc/rendezvous.h"
#include "misc/thread_tools.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "options/m_property.h"
#include "options/path.h"
#include "options/parse_configfile.h"
#include "osdep/threads.h"
#include "osdep/timer.h"
#include "osdep/io.h"
#include "stream/stream.h"
#include "command.h"
#include "core.h"
#include "client.h"
/*
* Locking hierarchy:
*
* MPContext > mp_client_api.lock > mpv_handle.lock > * > mpv_handle.wakeup_lock
*
* MPContext strictly speaking has no locks, and instead is implicitly managed
* by MPContext.dispatch, which basically stops the playback thread at defined
* points in order to let clients access it in a synchronized manner. Since
* MPContext code accesses the client API, it's on top of the lock hierarchy.
*
*/
struct mp_client_api {
struct MPContext *mpctx;
mp_mutex lock;
// -- protected by lock
struct mpv_handle **clients;
int num_clients;
bool shutting_down; // do not allow new clients
bool have_terminator; // a client took over the role of destroying the core
bool terminate_core_thread; // make libmpv core thread exit
// This is incremented whenever the clients[] array above changes. This is
// used to safely unlock mp_client_api.lock while iterating the list of
// clients.
uint64_t clients_list_change_ts;
int64_t id_alloc;
struct mp_custom_protocol *custom_protocols;
int num_custom_protocols;
struct mpv_render_context *render_context;
};
struct observe_property {
// -- immutable
struct mpv_handle *owner;
char *name;
int id; // ==mp_get_property_id(name)
uint64_t event_mask; // ==mp_get_property_event_mask(name)
int64_t reply_id;
mpv_format format;
const struct m_option *type;
// -- protected by owner->lock
size_t refcount;
uint64_t change_ts; // logical timestamp incremented on each change
uint64_t value_ts; // logical timestamp for value contents
bool value_valid;
union m_option_value value;
uint64_t value_ret_ts; // logical timestamp of value returned to user
union m_option_value value_ret;
bool waiting_for_hook; // flag for draining old property changes on a hook
};
struct mpv_handle {
// -- immutable
char name[MAX_CLIENT_NAME];
struct mp_log *log;
struct MPContext *mpctx;
struct mp_client_api *clients;
int64_t id;
// -- not thread-safe
struct mpv_event *cur_event;
struct mpv_event_property cur_property_event;
struct observe_property *cur_property;
mp_mutex lock;
mp_mutex wakeup_lock;
mp_cond wakeup;
// -- protected by wakeup_lock
bool need_wakeup;
void (*wakeup_cb)(void *d);
void *wakeup_cb_ctx;
int wakeup_pipe[2];
// -- protected by lock
uint64_t event_mask;
bool queued_wakeup;
mpv_event *events; // ringbuffer of max_events entries
int max_events; // allocated number of entries in events
int first_event; // events[first_event] is the first readable event
int num_events; // number of readable events
int reserved_events; // number of entries reserved for replies
size_t async_counter; // pending other async events
bool choked; // recovering from queue overflow
bool destroying; // pending destruction; no API accesses allowed
bool hook_pending; // hook events are returned after draining properties
struct observe_property **properties;
int num_properties;
bool has_pending_properties; // (maybe) new property events (producer side)
bool new_property_events; // new property events (consumer side)
int cur_property_index; // round-robin for property events (consumer side)
uint64_t property_event_masks; // or-ed together event masks of all properties
// This is incremented whenever the properties[] array above changes. This
// is used to safely unlock mpv_handle.lock while reading a property. If
// the counter didn't change between unlock and relock, then it will assume
// the array did not change.
uint64_t properties_change_ts;
bool fuzzy_initialized; // see scripting.c wait_loaded()
bool is_weak; // can not keep core alive on its own
struct mp_log_buffer *messages;
int messages_level;
};
static bool gen_log_message_event(struct mpv_handle *ctx);
static bool gen_property_change_event(struct mpv_handle *ctx);
static void notify_property_events(struct mpv_handle *ctx, int event);
// Must be called with prop->owner->lock held.
static void prop_unref(struct observe_property *prop)
{
if (!prop)
return;
assert(prop->refcount > 0);
prop->refcount -= 1;
if (!prop->refcount)
talloc_free(prop);
}
void mp_clients_init(struct MPContext *mpctx)
{
mpctx->clients = talloc_ptrtype(NULL, mpctx->clients);
*mpctx->clients = (struct mp_client_api) {
.mpctx = mpctx,
};
mpctx->global->client_api = mpctx->clients;
mp_mutex_init(&mpctx->clients->lock);
}
void mp_clients_destroy(struct MPContext *mpctx)
{
if (!mpctx->clients)
return;
assert(mpctx->clients->num_clients == 0);
// The API user is supposed to call mpv_render_context_free(). It's simply
// not allowed not to do this.
if (mpctx->clients->render_context) {
MP_FATAL(mpctx, "Broken API use: mpv_render_context_free() not called.\n");
abort();
}
mp_mutex_destroy(&mpctx->clients->lock);
talloc_free(mpctx->clients);
mpctx->clients = NULL;
}
// Test for "fuzzy" initialization of all clients. That is, all clients have
// at least called mpv_wait_event() at least once since creation (or exited).
bool mp_clients_all_initialized(struct MPContext *mpctx)
{
bool all_ok = true;
mp_mutex_lock(&mpctx->clients->lock);
for (int n = 0; n < mpctx->clients->num_clients; n++) {
struct mpv_handle *ctx = mpctx->clients->clients[n];
mp_mutex_lock(&ctx->lock);
all_ok &= ctx->fuzzy_initialized;
mp_mutex_unlock(&ctx->lock);
}
mp_mutex_unlock(&mpctx->clients->lock);
return all_ok;
}
static struct mpv_handle *find_client_id(struct mp_client_api *clients, int64_t id)
{
for (int n = 0; n < clients->num_clients; n++) {
if (clients->clients[n]->id == id)
return clients->clients[n];
}
return NULL;
}
static struct mpv_handle *find_client(struct mp_client_api *clients,
const char *name)
{
if (name[0] == '@') {
char *end;
errno = 0;
long long int id = strtoll(name + 1, &end, 10);
if (errno || end[0])
return NULL;
return find_client_id(clients, id);
}
for (int n = 0; n < clients->num_clients; n++) {
if (strcmp(clients->clients[n]->name, name) == 0)
return clients->clients[n];
}
return NULL;
}
bool mp_client_id_exists(struct MPContext *mpctx, int64_t id)
{
mp_mutex_lock(&mpctx->clients->lock);
bool r = find_client_id(mpctx->clients, id);
mp_mutex_unlock(&mpctx->clients->lock);
return r;
}
struct mpv_handle *mp_new_client(struct mp_client_api *clients, const char *name)
{
mp_mutex_lock(&clients->lock);
char nname[MAX_CLIENT_NAME];
for (int n = 1; n < 1000; n++) {
if (!name)
name = "client";
snprintf(nname, sizeof(nname) - 3, "%s", name); // - space for number
for (int i = 0; nname[i]; i++)
nname[i] = mp_isalnum(nname[i]) ? nname[i] : '_';
if (n > 1)
mp_snprintf_cat(nname, sizeof(nname), "%d", n);
if (!find_client(clients, nname))
break;
nname[0] = '\0';
}
if (!nname[0] || clients->shutting_down) {
mp_mutex_unlock(&clients->lock);
return NULL;
}
int num_events = 1000;
struct mpv_handle *client = talloc_ptrtype(NULL, client);
*client = (struct mpv_handle){
.log = mp_log_new(client, clients->mpctx->log, nname),
.mpctx = clients->mpctx,
.clients = clients,
.id = ++(clients->id_alloc),
.cur_event = talloc_zero(client, struct mpv_event),
.events = talloc_array(client, mpv_event, num_events),
.max_events = num_events,
.event_mask = (1ULL << INTERNAL_EVENT_BASE) - 1, // exclude internal events
.wakeup_pipe = {-1, -1},
};
mp_mutex_init(&client->lock);
mp_mutex_init(&client->wakeup_lock);
mp_cond_init(&client->wakeup);
snprintf(client->name, sizeof(client->name), "%s", nname);
clients->clients_list_change_ts += 1;
MP_TARRAY_APPEND(clients, clients->clients, clients->num_clients, client);
if (clients->num_clients == 1 && !clients->mpctx->is_cli)
client->fuzzy_initialized = true;
mp_mutex_unlock(&clients->lock);
mpv_request_event(client, MPV_EVENT_TICK, 0);
return client;
}
void mp_client_set_weak(struct mpv_handle *ctx)
{
mp_mutex_lock(&ctx->lock);
ctx->is_weak = true;
mp_mutex_unlock(&ctx->lock);
}
const char *mpv_client_name(mpv_handle *ctx)
{
return ctx->name;
}
int64_t mpv_client_id(mpv_handle *ctx)
{
return ctx->id;
}
struct mp_log *mp_client_get_log(struct mpv_handle *ctx)
{
return ctx->log;
}
struct mpv_global *mp_client_get_global(struct mpv_handle *ctx)
{
return ctx->mpctx->global;
}
static void wakeup_client(struct mpv_handle *ctx)
{
mp_mutex_lock(&ctx->wakeup_lock);
if (!ctx->need_wakeup) {
ctx->need_wakeup = true;
mp_cond_broadcast(&ctx->wakeup);
if (ctx->wakeup_cb)
ctx->wakeup_cb(ctx->wakeup_cb_ctx);
if (ctx->wakeup_pipe[0] != -1)
(void)write(ctx->wakeup_pipe[1], &(char){0}, 1);
}
mp_mutex_unlock(&ctx->wakeup_lock);
}
// Note: the caller has to deal with sporadic wakeups.
static int wait_wakeup(struct mpv_handle *ctx, int64_t end)
{
int r = 0;
mp_mutex_unlock(&ctx->lock);
mp_mutex_lock(&ctx->wakeup_lock);
if (!ctx->need_wakeup)
r = mp_cond_timedwait_until(&ctx->wakeup, &ctx->wakeup_lock, end);
if (r == 0)
ctx->need_wakeup = false;
mp_mutex_unlock(&ctx->wakeup_lock);
mp_mutex_lock(&ctx->lock);
return r;
}
void mpv_set_wakeup_callback(mpv_handle *ctx, void (*cb)(void *d), void *d)
{
mp_mutex_lock(&ctx->wakeup_lock);
ctx->wakeup_cb = cb;
ctx->wakeup_cb_ctx = d;
if (ctx->wakeup_cb)
ctx->wakeup_cb(ctx->wakeup_cb_ctx);
mp_mutex_unlock(&ctx->wakeup_lock);
}
static void lock_core(mpv_handle *ctx)
{
mp_dispatch_lock(ctx->mpctx->dispatch);
}
static void unlock_core(mpv_handle *ctx)
{
mp_dispatch_unlock(ctx->mpctx->dispatch);
}
void mpv_wait_async_requests(mpv_handle *ctx)
{
mp_mutex_lock(&ctx->lock);
while (ctx->reserved_events || ctx->async_counter)
wait_wakeup(ctx, INT64_MAX);
mp_mutex_unlock(&ctx->lock);
}
// Send abort signal to all matching work items.
// If type==0, destroy all of the matching ctx.
// If ctx==0, destroy all.
static void abort_async(struct MPContext *mpctx, mpv_handle *ctx,
int type, uint64_t id)
{
mp_mutex_lock(&mpctx->abort_lock);
// Destroy all => ensure any newly appearing work is aborted immediately.
if (ctx == NULL)
mpctx->abort_all = true;
for (int n = 0; n < mpctx->num_abort_list; n++) {
struct mp_abort_entry *abort = mpctx->abort_list[n];
if (!ctx || (abort->client == ctx && (!type ||
(abort->client_work_type == type && abort->client_work_id == id))))
{
mp_abort_trigger_locked(mpctx, abort);
}
}
mp_mutex_unlock(&mpctx->abort_lock);
}
static void mp_destroy_client(mpv_handle *ctx, bool terminate)
{
if (!ctx)
return;
struct MPContext *mpctx = ctx->mpctx;
struct mp_client_api *clients = ctx->clients;
MP_DBG(ctx, "Exiting...\n");
if (terminate)
mpv_command(ctx, (const char*[]){"quit", NULL});
mp_mutex_lock(&ctx->lock);
ctx->destroying = true;
for (int n = 0; n < ctx->num_properties; n++)
prop_unref(ctx->properties[n]);
ctx->num_properties = 0;
ctx->properties_change_ts += 1;
prop_unref(ctx->cur_property);
ctx->cur_property = NULL;
mp_mutex_unlock(&ctx->lock);
abort_async(mpctx, ctx, 0, 0);
// reserved_events equals the number of asynchronous requests that weren't
// yet replied. In order to avoid that trying to reply to a removed client
// causes a crash, block until all asynchronous requests were served.
mpv_wait_async_requests(ctx);
osd_set_external_remove_owner(mpctx->osd, ctx);
mp_input_remove_sections_by_owner(mpctx->input, ctx->name);
mp_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
if (clients->clients[n] == ctx) {
clients->clients_list_change_ts += 1;
MP_TARRAY_REMOVE_AT(clients->clients, clients->num_clients, n);
while (ctx->num_events) {
talloc_free(ctx->events[ctx->first_event].data);
ctx->first_event = (ctx->first_event + 1) % ctx->max_events;
ctx->num_events--;
}
mp_msg_log_buffer_destroy(ctx->messages);
mp_cond_destroy(&ctx->wakeup);
mp_mutex_destroy(&ctx->wakeup_lock);
mp_mutex_destroy(&ctx->lock);
if (ctx->wakeup_pipe[0] != -1) {
close(ctx->wakeup_pipe[0]);
close(ctx->wakeup_pipe[1]);
}
talloc_free(ctx);
ctx = NULL;
break;
}
}
assert(!ctx);
if (mpctx->is_cli) {
terminate = false;
} else {
// If the last strong mpv_handle got destroyed, destroy the core.
bool has_strong_ref = false;
for (int n = 0; n < clients->num_clients; n++)
has_strong_ref |= !clients->clients[n]->is_weak;
if (!has_strong_ref)
terminate = true;
// Reserve the right to destroy mpctx for us.
if (clients->have_terminator)
terminate = false;
clients->have_terminator |= terminate;
}
// mp_shutdown_clients() sleeps to avoid wasting CPU.
// mp_hook_test_completion() also relies on this a bit.
mp_wakeup_core(mpctx);
mp_mutex_unlock(&clients->lock);
// Note that even if num_clients==0, having set have_terminator keeps mpctx
// and the core thread alive.
if (terminate) {
// Make sure the core stops playing files etc. Being able to lock the
// dispatch queue requires that the core thread is still active.
mp_dispatch_lock(mpctx->dispatch);
mpctx->stop_play = PT_QUIT;
mp_dispatch_unlock(mpctx->dispatch);
// Ask the core thread to stop.
mp_mutex_lock(&clients->lock);
clients->terminate_core_thread = true;
mp_mutex_unlock(&clients->lock);
mp_wakeup_core(mpctx);
// Blocking wait for all clients and core thread to terminate.
mp_thread_join(mpctx->core_thread);
mp_destroy(mpctx);
}
}
void mpv_destroy(mpv_handle *ctx)
{
mp_destroy_client(ctx, false);
}
void mpv_terminate_destroy(mpv_handle *ctx)
{
mp_destroy_client(ctx, true);
}
// Can be called on the core thread only. Idempotent.
// Also happens to take care of shutting down any async work.
void mp_shutdown_clients(struct MPContext *mpctx)
{
struct mp_client_api *clients = mpctx->clients;
// Forcefully abort async work after 2 seconds of waiting.
double abort_time = mp_time_sec() + 2;
mp_mutex_lock(&clients->lock);
// Prevent that new clients can appear.
clients->shutting_down = true;
// Wait until we can terminate.
while (clients->num_clients || mpctx->outstanding_async ||
!(mpctx->is_cli || clients->terminate_core_thread))
{
mp_mutex_unlock(&clients->lock);
double left = abort_time - mp_time_sec();
if (left >= 0) {
mp_set_timeout(mpctx, left);
} else {
// Forcefully abort any ongoing async work. This is quite rude and
// probably not what everyone wants, so it happens only after a
// timeout.
abort_async(mpctx, NULL, 0, 0);
}
mp_client_broadcast_event(mpctx, MPV_EVENT_SHUTDOWN, NULL);
mp_wait_events(mpctx);
mp_mutex_lock(&clients->lock);
}
mp_mutex_unlock(&clients->lock);
}
bool mp_is_shutting_down(struct MPContext *mpctx)
{
struct mp_client_api *clients = mpctx->clients;
mp_mutex_lock(&clients->lock);
bool res = clients->shutting_down;
mp_mutex_unlock(&clients->lock);
return res;
}
static MP_THREAD_VOID core_thread(void *p)
{
struct MPContext *mpctx = p;
mp_thread_set_name("core");
while (!mpctx->initialized && mpctx->stop_play != PT_QUIT)
mp_idle(mpctx);
if (mpctx->initialized)
mp_play_files(mpctx);
// This actually waits until all clients are gone before actually
// destroying mpctx. Actual destruction is done by whatever destroys
// the last mpv_handle.
mp_shutdown_clients(mpctx);
MP_THREAD_RETURN();
}
mpv_handle *mpv_create(void)
{
struct MPContext *mpctx = mp_create();
if (!mpctx)
return NULL;
m_config_set_profile(mpctx->mconfig, "libmpv", 0);
mpv_handle *ctx = mp_new_client(mpctx->clients, "main");
if (!ctx) {
mp_destroy(mpctx);
return NULL;
}
if (mp_thread_create(&mpctx->core_thread, core_thread, mpctx) != 0) {
ctx->clients->have_terminator = true; // avoid blocking
mpv_terminate_destroy(ctx);
mp_destroy(mpctx);
return NULL;
}
return ctx;
}
mpv_handle *mpv_create_client(mpv_handle *ctx, const char *name)
{
if (!ctx)
return mpv_create();
mpv_handle *new = mp_new_client(ctx->mpctx->clients, name);
if (new)
mpv_wait_event(new, 0); // set fuzzy_initialized
return new;
}
mpv_handle *mpv_create_weak_client(mpv_handle *ctx, const char *name)
{
mpv_handle *new = mpv_create_client(ctx, name);
if (new)
mp_client_set_weak(new);
return new;
}
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
int mpv_initialize_opts(mpv_handle *ctx, char **options);
#else
static
#endif
int mpv_initialize_opts(mpv_handle *ctx, char **options)
{
lock_core(ctx);
int res = mp_initialize(ctx->mpctx, options) ? MPV_ERROR_INVALID_PARAMETER : 0;
mp_wakeup_core(ctx->mpctx);
unlock_core(ctx);
return res;
}
int mpv_initialize(mpv_handle *ctx)
{
return mpv_initialize_opts(ctx, NULL);
}
// set ev->data to a new copy of the original data
// (done only for message types that are broadcast)
static void dup_event_data(struct mpv_event *ev)
{
switch (ev->event_id) {
case MPV_EVENT_CLIENT_MESSAGE: {
struct mpv_event_client_message *src = ev->data;
struct mpv_event_client_message *msg =
talloc_zero(NULL, struct mpv_event_client_message);
for (int n = 0; n < src->num_args; n++) {
MP_TARRAY_APPEND(msg, msg->args, msg->num_args,
talloc_strdup(msg, src->args[n]));
}
ev->data = msg;
break;
}
case MPV_EVENT_START_FILE:
ev->data = talloc_memdup(NULL, ev->data, sizeof(mpv_event_start_file));
break;
case MPV_EVENT_END_FILE:
ev->data = talloc_memdup(NULL, ev->data, sizeof(mpv_event_end_file));
break;
default:
// Doesn't use events with memory allocation.
if (ev->data)
abort();
}
}
// Reserve an entry in the ring buffer. This can be used to guarantee that the
// reply can be made, even if the buffer becomes congested _after_ sending
// the request.
// Returns an error code if the buffer is full.
static int reserve_reply(struct mpv_handle *ctx)
{
int res = MPV_ERROR_EVENT_QUEUE_FULL;
mp_mutex_lock(&ctx->lock);
if (ctx->reserved_events + ctx->num_events < ctx->max_events && !ctx->choked)
{
ctx->reserved_events++;
res = 0;
}
mp_mutex_unlock(&ctx->lock);
return res;
}
static int append_event(struct mpv_handle *ctx, struct mpv_event event, bool copy)
{
if (ctx->num_events + ctx->reserved_events >= ctx->max_events)
return -1;
if (copy)
dup_event_data(&event);
ctx->events[(ctx->first_event + ctx->num_events) % ctx->max_events] = event;
ctx->num_events++;
wakeup_client(ctx);
if (event.event_id == MPV_EVENT_SHUTDOWN)
ctx->event_mask &= ctx->event_mask & ~(1ULL << MPV_EVENT_SHUTDOWN);
return 0;
}
static int send_event(struct mpv_handle *ctx, struct mpv_event *event, bool copy)
{
mp_mutex_lock(&ctx->lock);
uint64_t mask = 1ULL << event->event_id;
if (ctx->property_event_masks & mask)
notify_property_events(ctx, event->event_id);
int r;
if (!(ctx->event_mask & mask)) {
r = 0;
} else if (ctx->choked) {
r = -1;
} else {
r = append_event(ctx, *event, copy);
if (r < 0) {
MP_ERR(ctx, "Too many events queued.\n");
ctx->choked = true;
}
}
mp_mutex_unlock(&ctx->lock);
return r;
}
// Send a reply; the reply must have been previously reserved with
// reserve_reply (otherwise, use send_event()).
static void send_reply(struct mpv_handle *ctx, uint64_t userdata,
struct mpv_event *event)
{
event->reply_userdata = userdata;
mp_mutex_lock(&ctx->lock);
// If this fails, reserve_reply() probably wasn't called.
assert(ctx->reserved_events > 0);
ctx->reserved_events--;
if (append_event(ctx, *event, false) < 0)
MP_ASSERT_UNREACHABLE();
mp_mutex_unlock(&ctx->lock);
}
void mp_client_broadcast_event(struct MPContext *mpctx, int event, void *data)
{
struct mp_client_api *clients = mpctx->clients;
mp_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
struct mpv_event event_data = {
.event_id = event,
.data = data,
};
send_event(clients->clients[n], &event_data, true);
}
mp_mutex_unlock(&clients->lock);
}
// Like mp_client_broadcast_event(), but can be called from any thread.
// Avoid using this.
void mp_client_broadcast_event_external(struct mp_client_api *api, int event,
void *data)
{
struct MPContext *mpctx = api->mpctx;
mp_client_broadcast_event(mpctx, event, data);
mp_wakeup_core(mpctx);
}
// If client_name == NULL, then broadcast and free the event.
int mp_client_send_event(struct MPContext *mpctx, const char *client_name,
uint64_t reply_userdata, int event, void *data)
{
if (!client_name) {
mp_client_broadcast_event(mpctx, event, data);
talloc_free(data);
return 0;
}
struct mp_client_api *clients = mpctx->clients;
int r = 0;
struct mpv_event event_data = {
.event_id = event,
.data = data,
.reply_userdata = reply_userdata,
};
mp_mutex_lock(&clients->lock);
struct mpv_handle *ctx = find_client(clients, client_name);
if (ctx) {
r = send_event(ctx, &event_data, false);
} else {
r = -1;
talloc_free(data);
}
mp_mutex_unlock(&clients->lock);
return r;
}
int mp_client_send_event_dup(struct MPContext *mpctx, const char *client_name,
int event, void *data)
{
if (!client_name) {
mp_client_broadcast_event(mpctx, event, data);
return 0;
}
struct mpv_event event_data = {
.event_id = event,
.data = data,
};
dup_event_data(&event_data);
return mp_client_send_event(mpctx, client_name, 0, event, event_data.data);
}
static const bool deprecated_events[] = {
[MPV_EVENT_IDLE] = true,
[MPV_EVENT_TICK] = true,
};
int mpv_request_event(mpv_handle *ctx, mpv_event_id event, int enable)
{
if (!mpv_event_name(event) || enable < 0 || enable > 1)
return MPV_ERROR_INVALID_PARAMETER;
if (event == MPV_EVENT_SHUTDOWN && !enable)
return MPV_ERROR_INVALID_PARAMETER;
assert(event < (int)INTERNAL_EVENT_BASE); // excluded above; they have no name
mp_mutex_lock(&ctx->lock);
uint64_t bit = 1ULL << event;
ctx->event_mask = enable ? ctx->event_mask | bit : ctx->event_mask & ~bit;
if (enable && event < MP_ARRAY_SIZE(deprecated_events) &&
deprecated_events[event])
{
MP_WARN(ctx, "The '%s' event is deprecated and will be removed.\n",
mpv_event_name(event));
}
mp_mutex_unlock(&ctx->lock);
return 0;
}
// Set waiting_for_hook==true for all possibly pending properties.
static void set_wait_for_hook_flags(mpv_handle *ctx)
{
for (int n = 0; n < ctx->num_properties; n++) {
struct observe_property *prop = ctx->properties[n];
if (prop->value_ret_ts != prop->change_ts)
prop->waiting_for_hook = true;
}
}
// Return whether any property still has waiting_for_hook set.
static bool check_for_for_hook_flags(mpv_handle *ctx)
{
for (int n = 0; n < ctx->num_properties; n++) {
if (ctx->properties[n]->waiting_for_hook)
return true;
}
return false;
}
mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout)
{
mpv_event *event = ctx->cur_event;
mp_mutex_lock(&ctx->lock);
if (!ctx->fuzzy_initialized)
mp_wakeup_core(ctx->clients->mpctx);
ctx->fuzzy_initialized = true;
if (timeout < 0)
timeout = 1e20;
int64_t deadline = mp_time_ns_add(mp_time_ns(), timeout);
*event = (mpv_event){0};
talloc_free_children(event);
while (1) {
if (ctx->queued_wakeup)
deadline = 0;
// Recover from overflow.
if (ctx->choked && !ctx->num_events) {
ctx->choked = false;
event->event_id = MPV_EVENT_QUEUE_OVERFLOW;
break;
}
struct mpv_event *ev =
ctx->num_events ? &ctx->events[ctx->first_event] : NULL;
if (ev && ev->event_id == MPV_EVENT_HOOK) {
// Give old property notifications priority over hooks. This is a
// guarantee given to clients to simplify their logic. New property
// changes after this are treated normally, so
if (!ctx->hook_pending) {
ctx->hook_pending = true;
set_wait_for_hook_flags(ctx);
}
if (check_for_for_hook_flags(ctx)) {
ev = NULL; // delay
} else {
ctx->hook_pending = false;
}
}
if (ev) {
*event = *ev;
ctx->first_event = (ctx->first_event + 1) % ctx->max_events;
ctx->num_events--;
talloc_steal(event, event->data);
break;
}
// If there's a changed property, generate change event (never queued).
if (gen_property_change_event(ctx))
break;
// Pop item from message queue, and return as event.
if (gen_log_message_event(ctx))
break;
int r = wait_wakeup(ctx, deadline);
if (r == ETIMEDOUT)
break;
}
ctx->queued_wakeup = false;
mp_mutex_unlock(&ctx->lock);
return event;
}
void mpv_wakeup(mpv_handle *ctx)
{
mp_mutex_lock(&ctx->lock);
ctx->queued_wakeup = true;
wakeup_client(ctx);
mp_mutex_unlock(&ctx->lock);
}
// map client API types to internal types
static const struct m_option type_conv[] = {
[MPV_FORMAT_STRING] = { .type = CONF_TYPE_STRING },
[MPV_FORMAT_FLAG] = { .type = CONF_TYPE_FLAG },
[MPV_FORMAT_INT64] = { .type = CONF_TYPE_INT64 },
[MPV_FORMAT_DOUBLE] = { .type = CONF_TYPE_DOUBLE },
[MPV_FORMAT_NODE] = { .type = CONF_TYPE_NODE },
};
static const struct m_option *get_mp_type(mpv_format format)
{
if ((unsigned)format >= MP_ARRAY_SIZE(type_conv))
return NULL;
if (!type_conv[format].type)
return NULL;
return &type_conv[format];
}
// for read requests - MPV_FORMAT_OSD_STRING special handling
static const struct m_option *get_mp_type_get(mpv_format format)
{
if (format == MPV_FORMAT_OSD_STRING)
format = MPV_FORMAT_STRING; // it's string data, just other semantics
return get_mp_type(format);
}
// move src->dst, and do implicit conversion if possible (conversions to or
// from strings are handled otherwise)
static bool conv_node_to_format(void *dst, mpv_format dst_fmt, mpv_node *src)
{
if (dst_fmt == src->format) {
const struct m_option *type = get_mp_type(dst_fmt);
memcpy(dst, &src->u, type->type->size);
return true;
}
if (dst_fmt == MPV_FORMAT_DOUBLE && src->format == MPV_FORMAT_INT64) {
*(double *)dst = src->u.int64;
return true;
}
if (dst_fmt == MPV_FORMAT_INT64 && src->format == MPV_FORMAT_DOUBLE) {
if (src->u.double_ > (double)INT64_MIN &&
src->u.double_ < (double)INT64_MAX)
{
*(int64_t *)dst = src->u.double_;
return true;
}
}
return false;
}
void mpv_free_node_contents(mpv_node *node)
{
static const struct m_option type = { .type = CONF_TYPE_NODE };
m_option_free(&type, node);
}
int mpv_set_option(mpv_handle *ctx, const char *name, mpv_format format,
void *data)
{
const struct m_option *type = get_mp_type(format);
if (!type)
return MPV_ERROR_OPTION_FORMAT;
struct mpv_node tmp;
if (format != MPV_FORMAT_NODE) {
tmp.format = format;
memcpy(&tmp.u, data, type->type->size);
data = &tmp;
}
lock_core(ctx);
int err = m_config_set_option_node(ctx->mpctx->mconfig, bstr0(name), data, 0);
unlock_core(ctx);
switch (err) {
case M_OPT_MISSING_PARAM:
case M_OPT_INVALID:
return MPV_ERROR_OPTION_ERROR;
case M_OPT_OUT_OF_RANGE:
return MPV_ERROR_OPTION_FORMAT;
case M_OPT_UNKNOWN:
return MPV_ERROR_OPTION_NOT_FOUND;
default:
if (err >= 0)
return 0;
return MPV_ERROR_OPTION_ERROR;
}
}
int mpv_set_option_string(mpv_handle *ctx, const char *name, const char *data)
{
return mpv_set_option(ctx, name, MPV_FORMAT_STRING, &data);
}
// Run a command in the playback thread.
static void run_locked(mpv_handle *ctx, void (*fn)(void *fn_data), void *fn_data)
{
mp_dispatch_lock(ctx->mpctx->dispatch);
fn(fn_data);
mp_dispatch_unlock(ctx->mpctx->dispatch);
}
// Run a command asynchronously. It's the responsibility of the caller to
// actually send the reply. This helper merely saves a small part of the
// required boilerplate to do so.
// fn: callback to execute the request
// fn_data: opaque caller-defined argument for fn. This will be automatically
// freed with talloc_free(fn_data).
static int run_async(mpv_handle *ctx, void (*fn)(void *fn_data), void *fn_data)
{
int err = reserve_reply(ctx);
if (err < 0) {
talloc_free(fn_data);
return err;
}
mp_dispatch_enqueue(ctx->mpctx->dispatch, fn, fn_data);
return 0;
}
struct cmd_request {
struct MPContext *mpctx;
struct mp_cmd *cmd;
int status;
struct mpv_node *res;
struct mp_waiter completion;
};
static void cmd_complete(struct mp_cmd_ctx *cmd)
{
struct cmd_request *req = cmd->on_completion_priv;
req->status = cmd->success ? 0 : MPV_ERROR_COMMAND;
if (req->res) {
*req->res = cmd->result;
cmd->result = (mpv_node){0};
}
// Unblock the waiting thread (especially for async commands).
mp_waiter_wakeup(&req->completion, 0);
}
static int run_client_command(mpv_handle *ctx, struct mp_cmd *cmd, mpv_node *res)
{
if (!cmd)
return MPV_ERROR_INVALID_PARAMETER;
if (!ctx->mpctx->initialized) {
talloc_free(cmd);
return MPV_ERROR_UNINITIALIZED;
}
cmd->sender = ctx->name;
struct cmd_request req = {
.mpctx = ctx->mpctx,
.cmd = cmd,
.res = res,
.completion = MP_WAITER_INITIALIZER,
};
bool async = cmd->flags & MP_ASYNC_CMD;
lock_core(ctx);
if (async) {
run_command(ctx->mpctx, cmd, NULL, NULL, NULL);
} else {
struct mp_abort_entry *abort = NULL;
if (cmd->def->can_abort) {
abort = talloc_zero(NULL, struct mp_abort_entry);
abort->client = ctx;
}
run_command(ctx->mpctx, cmd, abort, cmd_complete, &req);
}
unlock_core(ctx);
if (!async)
mp_waiter_wait(&req.completion);
return req.status;
}
int mpv_command(mpv_handle *ctx, const char **args)
{
return run_client_command(ctx, mp_input_parse_cmd_strv(ctx->log, args), NULL);
}
int mpv_command_node(mpv_handle *ctx, mpv_node *args, mpv_node *result)
{
struct mpv_node rn = {.format = MPV_FORMAT_NONE};
int r = run_client_command(ctx, mp_input_parse_cmd_node(ctx->log, args), &rn);
if (result && r >= 0)
*result = rn;
return r;
}
int mpv_command_ret(mpv_handle *ctx, const char **args, mpv_node *result)
{
struct mpv_node rn = {.format = MPV_FORMAT_NONE};
int r = run_client_command(ctx, mp_input_parse_cmd_strv(ctx->log, args), &rn);
if (result && r >= 0)
*result = rn;
return r;
}
int mpv_command_string(mpv_handle *ctx, const char *args)
{
return run_client_command(ctx,
mp_input_parse_cmd(ctx->mpctx->input, bstr0((char*)args), ctx->name), NULL);
}
struct async_cmd_request {
struct MPContext *mpctx;
struct mp_cmd *cmd;
struct mpv_handle *reply_ctx;
uint64_t userdata;
};
static void async_cmd_complete(struct mp_cmd_ctx *cmd)
{
struct async_cmd_request *req = cmd->on_completion_priv;
struct mpv_event_command *data = talloc_zero(NULL, struct mpv_event_command);
data->result = cmd->result;
cmd->result = (mpv_node){0};
talloc_steal(data, node_get_alloc(&data->result));
struct mpv_event reply = {
.event_id = MPV_EVENT_COMMAND_REPLY,
.data = data,
.error = cmd->success ? 0 : MPV_ERROR_COMMAND,
};
send_reply(req->reply_ctx, req->userdata, &reply);
talloc_free(req);
}
static void async_cmd_fn(void *data)
{
struct async_cmd_request *req = data;
struct mp_cmd *cmd = req->cmd;
ta_set_parent(cmd, NULL);
req->cmd = NULL;
struct mp_abort_entry *abort = NULL;
if (cmd->def->can_abort) {
abort = talloc_zero(NULL, struct mp_abort_entry);
abort->client = req->reply_ctx;
abort->client_work_type = MPV_EVENT_COMMAND_REPLY;
abort->client_work_id = req->userdata;
}
// This will synchronously or asynchronously call cmd_complete (depending
// on the command).
run_command(req->mpctx, cmd, abort, async_cmd_complete, req);
}
static int run_async_cmd(mpv_handle *ctx, uint64_t ud, struct mp_cmd *cmd)
{
if (!cmd)
return MPV_ERROR_INVALID_PARAMETER;
if (!ctx->mpctx->initialized) {
talloc_free(cmd);
return MPV_ERROR_UNINITIALIZED;
}
cmd->sender = ctx->name;
struct async_cmd_request *req = talloc_ptrtype(NULL, req);
*req = (struct async_cmd_request){
.mpctx = ctx->mpctx,
.cmd = talloc_steal(req, cmd),
.reply_ctx = ctx,
.userdata = ud,
};
return run_async(ctx, async_cmd_fn, req);
}
int mpv_command_async(mpv_handle *ctx, uint64_t ud, const char **args)
{
return run_async_cmd(ctx, ud, mp_input_parse_cmd_strv(ctx->log, args));
}
int mpv_command_node_async(mpv_handle *ctx, uint64_t ud, mpv_node *args)
{
return run_async_cmd(ctx, ud, mp_input_parse_cmd_node(ctx->log, args));
}
void mpv_abort_async_command(mpv_handle *ctx, uint64_t reply_userdata)
{
abort_async(ctx->mpctx, ctx, MPV_EVENT_COMMAND_REPLY, reply_userdata);
}
static int translate_property_error(int errc)
{
switch (errc) {
case M_PROPERTY_OK: return 0;
case M_PROPERTY_ERROR: return MPV_ERROR_PROPERTY_ERROR;
case M_PROPERTY_UNAVAILABLE: return MPV_ERROR_PROPERTY_UNAVAILABLE;
case M_PROPERTY_NOT_IMPLEMENTED: return MPV_ERROR_PROPERTY_ERROR;
case M_PROPERTY_UNKNOWN: return MPV_ERROR_PROPERTY_NOT_FOUND;
case M_PROPERTY_INVALID_FORMAT: return MPV_ERROR_PROPERTY_FORMAT;
// shouldn't happen
default: return MPV_ERROR_PROPERTY_ERROR;
}
}
struct setproperty_request {
struct MPContext *mpctx;
const char *name;
int format;
void *data;
int status;
struct mpv_handle *reply_ctx;
uint64_t userdata;
};
static void setproperty_fn(void *arg)
{
struct setproperty_request *req = arg;
const struct m_option *type = get_mp_type(req->format);
struct mpv_node *node;
struct mpv_node tmp;
if (req->format == MPV_FORMAT_NODE) {
node = req->data;
} else {
tmp.format = req->format;
memcpy(&tmp.u, req->data, type->type->size);
node = &tmp;
}
int err = mp_property_do(req->name, M_PROPERTY_SET_NODE, node, req->mpctx);
req->status = translate_property_error(err);
if (req->reply_ctx) {
struct mpv_event reply = {
.event_id = MPV_EVENT_SET_PROPERTY_REPLY,
.error = req->status,
};
send_reply(req->reply_ctx, req->userdata, &reply);
talloc_free(req);
}
}
int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format,
void *data)
{
if (!ctx->mpctx->initialized) {
int r = mpv_set_option(ctx, name, format, data);
if (r == MPV_ERROR_OPTION_NOT_FOUND &&
mp_get_property_id(ctx->mpctx, name) >= 0)
return MPV_ERROR_PROPERTY_UNAVAILABLE;
switch (r) {
case MPV_ERROR_SUCCESS: return MPV_ERROR_SUCCESS;
case MPV_ERROR_OPTION_FORMAT: return MPV_ERROR_PROPERTY_FORMAT;
case MPV_ERROR_OPTION_NOT_FOUND: return MPV_ERROR_PROPERTY_NOT_FOUND;
default: return MPV_ERROR_PROPERTY_ERROR;
}
}
if (!get_mp_type(format))
return MPV_ERROR_PROPERTY_FORMAT;
struct setproperty_request req = {
.mpctx = ctx->mpctx,
.name = name,
.format = format,
.data = data,
};
run_locked(ctx, setproperty_fn, &req);
return req.status;
}
int mpv_del_property(mpv_handle *ctx, const char *name)
{
const char* args[] = { "del", name, NULL };
return mpv_command(ctx, args);
}
int mpv_set_property_string(mpv_handle *ctx, const char *name, const char *data)
{
return mpv_set_property(ctx, name, MPV_FORMAT_STRING, &data);
}
static void free_prop_set_req(void *ptr)
{
struct setproperty_request *req = ptr;
const struct m_option *type = get_mp_type(req->format);
m_option_free(type, req->data);
}
int mpv_set_property_async(mpv_handle *ctx, uint64_t ud, const char *name,
mpv_format format, void *data)
{
const struct m_option *type = get_mp_type(format);
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
if (!type)
return MPV_ERROR_PROPERTY_FORMAT;
struct setproperty_request *req = talloc_ptrtype(NULL, req);
*req = (struct setproperty_request){
.mpctx = ctx->mpctx,
.name = talloc_strdup(req, name),
.format = format,
.data = talloc_zero_size(req, type->type->size),
.reply_ctx = ctx,
.userdata = ud,
};
m_option_copy(type, req->data, data);
talloc_set_destructor(req, free_prop_set_req);
return run_async(ctx, setproperty_fn, req);
}
struct getproperty_request {
struct MPContext *mpctx;
const char *name;
mpv_format format;
void *data;
int status;
struct mpv_handle *reply_ctx;
uint64_t userdata;
};
static void free_prop_data(void *ptr)
{
struct mpv_event_property *prop = ptr;
const struct m_option *type = get_mp_type_get(prop->format);
m_option_free(type, prop->data);
}
static void getproperty_fn(void *arg)
{
struct getproperty_request *req = arg;
const struct m_option *type = get_mp_type_get(req->format);
union m_option_value xdata = m_option_value_default;
void *data = req->data ? req->data : &xdata;
int err = -1;
switch (req->format) {
case MPV_FORMAT_OSD_STRING:
err = mp_property_do(req->name, M_PROPERTY_PRINT, data, req->mpctx);
break;
case MPV_FORMAT_STRING: {
char *s = NULL;
err = mp_property_do(req->name, M_PROPERTY_GET_STRING, &s, req->mpctx);
if (err == M_PROPERTY_OK)
*(char **)data = s;
break;
}
case MPV_FORMAT_NODE:
case MPV_FORMAT_FLAG:
case MPV_FORMAT_INT64:
case MPV_FORMAT_DOUBLE: {
struct mpv_node node = {{0}};
err = mp_property_do(req->name, M_PROPERTY_GET_NODE, &node, req->mpctx);
if (err == M_PROPERTY_NOT_IMPLEMENTED) {
// Go through explicit string conversion. Same reasoning as on the
// GET code path.
char *s = NULL;
err = mp_property_do(req->name, M_PROPERTY_GET_STRING, &s,
req->mpctx);
if (err != M_PROPERTY_OK)
break;
node.format = MPV_FORMAT_STRING;
node.u.string = s;
} else if (err <= 0)
break;
if (req->format == MPV_FORMAT_NODE) {
*(struct mpv_node *)data = node;
} else {
if (!conv_node_to_format(data, req->format, &node)) {
err = M_PROPERTY_INVALID_FORMAT;
mpv_free_node_contents(&node);
}
}
break;
}
default:
abort();
}
req->status = translate_property_error(err);
if (req->reply_ctx) {
struct mpv_event_property *prop = talloc_ptrtype(NULL, prop);
*prop = (struct mpv_event_property){
.name = talloc_steal(prop, (char *)req->name),
.format = req->format,
.data = talloc_size(prop, type->type->size),
};
// move data
memcpy(prop->data, &xdata, type->type->size);
talloc_set_destructor(prop, free_prop_data);
struct mpv_event reply = {
.event_id = MPV_EVENT_GET_PROPERTY_REPLY,
.data = prop,
.error = req->status,
};
send_reply(req->reply_ctx, req->userdata, &reply);
talloc_free(req);
}
}
int mpv_get_property(mpv_handle *ctx, const char *name, mpv_format format,
void *data)
{
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
if (!data)
return MPV_ERROR_INVALID_PARAMETER;
if (!get_mp_type_get(format))
return MPV_ERROR_PROPERTY_FORMAT;
struct getproperty_request req = {
.mpctx = ctx->mpctx,
.name = name,
.format = format,
.data = data,
};
run_locked(ctx, getproperty_fn, &req);
return req.status;
}
char *mpv_get_property_string(mpv_handle *ctx, const char *name)
{
char *str = NULL;
mpv_get_property(ctx, name, MPV_FORMAT_STRING, &str);
return str;
}
char *mpv_get_property_osd_string(mpv_handle *ctx, const char *name)
{
char *str = NULL;
mpv_get_property(ctx, name, MPV_FORMAT_OSD_STRING, &str);
return str;
}
int mpv_get_property_async(mpv_handle *ctx, uint64_t ud, const char *name,
mpv_format format)
{
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
if (!get_mp_type_get(format))
return MPV_ERROR_PROPERTY_FORMAT;
struct getproperty_request *req = talloc_ptrtype(NULL, req);
*req = (struct getproperty_request){
.mpctx = ctx->mpctx,
.name = talloc_strdup(req, name),
.format = format,
.reply_ctx = ctx,
.userdata = ud,
};
return run_async(ctx, getproperty_fn, req);
}
static void property_free(void *p)
{
struct observe_property *prop = p;
assert(prop->refcount == 0);
if (prop->type) {
m_option_free(prop->type, &prop->value);
m_option_free(prop->type, &prop->value_ret);
}
}
int mpv_observe_property(mpv_handle *ctx, uint64_t userdata,
const char *name, mpv_format format)
{
const struct m_option *type = get_mp_type_get(format);
if (format != MPV_FORMAT_NONE && !type)
return MPV_ERROR_PROPERTY_FORMAT;
// Explicitly disallow this, because it would require a special code path.
if (format == MPV_FORMAT_OSD_STRING)
return MPV_ERROR_PROPERTY_FORMAT;
mp_mutex_lock(&ctx->lock);
assert(!ctx->destroying);
struct observe_property *prop = talloc_ptrtype(ctx, prop);
talloc_set_destructor(prop, property_free);
*prop = (struct observe_property){
.owner = ctx,
.name = talloc_strdup(prop, name),
.id = mp_get_property_id(ctx->mpctx, name),
.event_mask = mp_get_property_event_mask(name),
.reply_id = userdata,
.format = format,
.type = type,
.change_ts = 1, // force initial event
.refcount = 1,
.value = m_option_value_default,
.value_ret = m_option_value_default,
};
ctx->properties_change_ts += 1;
MP_TARRAY_APPEND(ctx, ctx->properties, ctx->num_properties, prop);
ctx->property_event_masks |= prop->event_mask;
ctx->new_property_events = true;
ctx->cur_property_index = 0;
ctx->has_pending_properties = true;
mp_mutex_unlock(&ctx->lock);
mp_wakeup_core(ctx->mpctx);
return 0;
}
int mpv_unobserve_property(mpv_handle *ctx, uint64_t userdata)
{
mp_mutex_lock(&ctx->lock);
int count = 0;
for (int n = ctx->num_properties - 1; n >= 0; n--) {
struct observe_property *prop = ctx->properties[n];
// Perform actual removal of the property lazily to avoid creating
// dangling pointers and such.
if (prop->reply_id == userdata) {
prop_unref(prop);
ctx->properties_change_ts += 1;
MP_TARRAY_REMOVE_AT(ctx->properties, ctx->num_properties, n);
ctx->cur_property_index = 0;
count++;
}
}
mp_mutex_unlock(&ctx->lock);
return count;
}
static bool property_shared_prefix(const char *a0, const char *b0)
{
bstr a = bstr0(a0);
bstr b = bstr0(b0);
// Treat options and properties as equivalent.
bstr_eatstart0(&a, "options/");
bstr_eatstart0(&b, "options/");
// Compare the potentially-common portion
if (memcmp(a.start, b.start, MPMIN(a.len, b.len)))
return false;
// If lengths were equal, we're done
if (a.len == b.len)
return true;
// Check for a slash in the first non-common byte of the longer string
if (a.len > b.len)
return a.start[b.len] == '/';
else
return b.start[a.len] == '/';
}
// Broadcast that a property has changed.
void mp_client_property_change(struct MPContext *mpctx, const char *name)
{
struct mp_client_api *clients = mpctx->clients;
int id = mp_get_property_id(mpctx, name);
bool any_pending = false;
mp_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
struct mpv_handle *client = clients->clients[n];
mp_mutex_lock(&client->lock);
for (int i = 0; i < client->num_properties; i++) {
if (client->properties[i]->id == id &&
property_shared_prefix(name, client->properties[i]->name)) {
client->properties[i]->change_ts += 1;
client->has_pending_properties = true;
any_pending = true;
}
}
mp_mutex_unlock(&client->lock);
}
mp_mutex_unlock(&clients->lock);
// If we're inside mp_dispatch_queue_process(), this will cause the playloop
// to be re-run (to get mp_client_send_property_changes() called). If we're
// inside the normal playloop, this does nothing, but the latter function
// will be called at the end of the playloop anyway.
if (any_pending)
mp_dispatch_adjust_timeout(mpctx->dispatch, 0);
}
// Mark properties as changed in reaction to specific events.
// Called with ctx->lock held.
static void notify_property_events(struct mpv_handle *ctx, int event)
{
uint64_t mask = 1ULL << event;
for (int i = 0; i < ctx->num_properties; i++) {
if (ctx->properties[i]->event_mask & mask) {
ctx->properties[i]->change_ts += 1;
ctx->has_pending_properties = true;
}
}
// Same as in mp_client_property_change().
if (ctx->has_pending_properties)
mp_dispatch_adjust_timeout(ctx->mpctx->dispatch, 0);
}
// Call with ctx->lock held (only). May temporarily drop the lock.
static void send_client_property_changes(struct mpv_handle *ctx)
{
uint64_t cur_ts = ctx->properties_change_ts;
ctx->has_pending_properties = false;
for (int n = 0; n < ctx->num_properties; n++) {
struct observe_property *prop = ctx->properties[n];
if (prop->value_ts == prop->change_ts)
continue;
bool changed = false;
if (prop->format) {
const struct m_option *type = prop->type;
union m_option_value val = m_option_value_default;
struct getproperty_request req = {
.mpctx = ctx->mpctx,
.name = prop->name,
.format = prop->format,
.data = &val,
};
// Temporarily unlock and read the property. The very important
// thing is that property getters can do whatever they want, _and_
// that they may wait on the client API user thread (if vo_libmpv
// or similar things are involved).
prop->refcount += 1; // keep prop alive (esp. prop->name)
ctx->async_counter += 1; // keep ctx alive
mp_mutex_unlock(&ctx->lock);
getproperty_fn(&req);
mp_mutex_lock(&ctx->lock);
ctx->async_counter -= 1;
prop_unref(prop);
// Set if observed properties was changed or something similar
// => start over, retry next time.
if (cur_ts != ctx->properties_change_ts || ctx->destroying) {
m_option_free(type, &val);
mp_wakeup_core(ctx->mpctx);
ctx->has_pending_properties = true;
break;
}
assert(prop->refcount > 0);
bool val_valid = req.status >= 0;
changed = prop->value_valid != val_valid;
if (prop->value_valid && val_valid)
changed = !equal_mpv_value(&prop->value, &val, prop->format);
if (prop->value_ts == 0)
changed = true; // initial event
prop->value_valid = val_valid;
if (changed && val_valid) {
// move val to prop->value
m_option_free(type, &prop->value);
memcpy(&prop->value, &val, type->type->size);
memset(&val, 0, type->type->size);
}
m_option_free(prop->type, &val);
} else {
changed = true;
}
if (prop->waiting_for_hook)
ctx->new_property_events = true; // make sure to wakeup
// Avoid retriggering the change event if the property didn't change,
// and the previous value was actually returned to the client.
if (!changed && prop->value_ret_ts == prop->value_ts) {
prop->value_ret_ts = prop->change_ts; // no change => no event
prop->waiting_for_hook = false;
} else {
ctx->new_property_events = true;
}
prop->value_ts = prop->change_ts;
}
if (ctx->destroying || ctx->new_property_events)
wakeup_client(ctx);
}
void mp_client_send_property_changes(struct MPContext *mpctx)
{
struct mp_client_api *clients = mpctx->clients;
mp_mutex_lock(&clients->lock);
uint64_t cur_ts = clients->clients_list_change_ts;
for (int n = 0; n < clients->num_clients; n++) {
struct mpv_handle *ctx = clients->clients[n];
mp_mutex_lock(&ctx->lock);
if (!ctx->has_pending_properties || ctx->destroying) {
mp_mutex_unlock(&ctx->lock);
continue;
}
// Keep ctx->lock locked (unlock order does not matter).
mp_mutex_unlock(&clients->lock);
send_client_property_changes(ctx);
mp_mutex_unlock(&ctx->lock);
mp_mutex_lock(&clients->lock);
if (cur_ts != clients->clients_list_change_ts) {
// List changed; need to start over. Do it in the next iteration.
mp_wakeup_core(mpctx);
break;
}
}
mp_mutex_unlock(&clients->lock);
}
// Set ctx->cur_event to a generated property change event, if there is any
// outstanding property.
static bool gen_property_change_event(struct mpv_handle *ctx)
{
if (!ctx->mpctx->initialized)
return false;
while (1) {
if (ctx->cur_property_index >= ctx->num_properties) {
ctx->new_property_events &= ctx->num_properties > 0;
if (!ctx->new_property_events)
break;
ctx->new_property_events = false;
ctx->cur_property_index = 0;
}
struct observe_property *prop = ctx->properties[ctx->cur_property_index++];
if (prop->value_ts == prop->change_ts && // not a stale value?
prop->value_ret_ts != prop->value_ts) // other value than last time?
{
prop->value_ret_ts = prop->value_ts;
prop->waiting_for_hook = false;
prop_unref(ctx->cur_property);
ctx->cur_property = prop;
prop->refcount += 1;
if (prop->value_valid)
m_option_copy(prop->type, &prop->value_ret, &prop->value);
ctx->cur_property_event = (struct mpv_event_property){
.name = prop->name,
.format = prop->value_valid ? prop->format : 0,
.data = prop->value_valid ? &prop->value_ret : NULL,
};
*ctx->cur_event = (struct mpv_event){
.event_id = MPV_EVENT_PROPERTY_CHANGE,
.reply_userdata = prop->reply_id,
.data = &ctx->cur_property_event,
};
return true;
}
}
return false;
}
int mpv_hook_add(mpv_handle *ctx, uint64_t reply_userdata,
const char *name, int priority)
{
lock_core(ctx);
mp_hook_add(ctx->mpctx, ctx->name, ctx->id, name, reply_userdata, priority);
unlock_core(ctx);
return 0;
}
int mpv_hook_continue(mpv_handle *ctx, uint64_t id)
{
lock_core(ctx);
int r = mp_hook_continue(ctx->mpctx, ctx->id, id);
unlock_core(ctx);
return r;
}
int mpv_load_config_file(mpv_handle *ctx, const char *filename)
{
lock_core(ctx);
int r = m_config_parse_config_file(ctx->mpctx->mconfig, ctx->mpctx->global, filename, NULL, 0);
unlock_core(ctx);
if (r == 0)
return MPV_ERROR_INVALID_PARAMETER;
if (r < 0)
return MPV_ERROR_OPTION_ERROR;
return 0;
}
static void msg_wakeup(void *p)
{
mpv_handle *ctx = p;
wakeup_client(ctx);
}
// Undocumented: if min_level starts with "silent:", then log messages are not
// returned to the API user, but are stored until logging is enabled normally
// again by calling this without "silent:". (Using a different level will
// flush it, though.)
int mpv_request_log_messages(mpv_handle *ctx, const char *min_level)
{
bstr blevel = bstr0(min_level);
bool silent = bstr_eatstart0(&blevel, "silent:");
int level = -1;
for (int n = 0; n < MSGL_MAX + 1; n++) {
if (mp_log_levels[n] && bstr_equals0(blevel, mp_log_levels[n])) {
level = n;
break;
}
}
if (bstr_equals0(blevel, "terminal-default"))
level = MP_LOG_BUFFER_MSGL_TERM;
if (level < 0 && strcmp(min_level, "no") != 0)
return MPV_ERROR_INVALID_PARAMETER;
mp_mutex_lock(&ctx->lock);
if (level < 0 || level != ctx->messages_level) {
mp_msg_log_buffer_destroy(ctx->messages);
ctx->messages = NULL;
}
if (level >= 0) {
if (!ctx->messages) {
int size = level >= MSGL_V ? 10000 : 1000;
ctx->messages = mp_msg_log_buffer_new(ctx->mpctx->global, size,
level, msg_wakeup, ctx);
ctx->messages_level = level;
}
mp_msg_log_buffer_set_silent(ctx->messages, silent);
}
wakeup_client(ctx);
mp_mutex_unlock(&ctx->lock);
return 0;
}
// Set ctx->cur_event to a generated log message event, if any available.
static bool gen_log_message_event(struct mpv_handle *ctx)
{
if (ctx->messages) {
struct mp_log_buffer_entry *msg =
mp_msg_log_buffer_read(ctx->messages);
if (msg) {
struct mpv_event_log_message *cmsg =
talloc_ptrtype(ctx->cur_event, cmsg);
talloc_steal(cmsg, msg);
*cmsg = (struct mpv_event_log_message){
.prefix = msg->prefix,
.level = mp_log_levels[msg->level],
.log_level = mp_mpv_log_levels[msg->level],
.text = msg->text,
};
*ctx->cur_event = (struct mpv_event){
.event_id = MPV_EVENT_LOG_MESSAGE,
.data = cmsg,
};
return true;
}
}
return false;
}
int mpv_get_wakeup_pipe(mpv_handle *ctx)
{
mp_mutex_lock(&ctx->wakeup_lock);
if (ctx->wakeup_pipe[0] == -1) {
if (mp_make_wakeup_pipe(ctx->wakeup_pipe) >= 0)
(void)write(ctx->wakeup_pipe[1], &(char){0}, 1);
}
int fd = ctx->wakeup_pipe[0];
mp_mutex_unlock(&ctx->wakeup_lock);
return fd;
}
unsigned long mpv_client_api_version(void)
{
return MPV_CLIENT_API_VERSION;
}
int mpv_event_to_node(mpv_node *dst, mpv_event *event)
{
*dst = (mpv_node){0};
node_init(dst, MPV_FORMAT_NODE_MAP, NULL);
node_map_add_string(dst, "event", mpv_event_name(event->event_id));
if (event->error < 0)
node_map_add_string(dst, "error", mpv_error_string(event->error));
if (event->reply_userdata)
node_map_add_int64(dst, "id", event->reply_userdata);
switch (event->event_id) {
case MPV_EVENT_START_FILE: {
mpv_event_start_file *esf = event->data;
node_map_add_int64(dst, "playlist_entry_id", esf->playlist_entry_id);
break;
}
case MPV_EVENT_END_FILE: {
mpv_event_end_file *eef = event->data;
const char *reason;
switch (eef->reason) {
case MPV_END_FILE_REASON_EOF: reason = "eof"; break;
case MPV_END_FILE_REASON_STOP: reason = "stop"; break;
case MPV_END_FILE_REASON_QUIT: reason = "quit"; break;
case MPV_END_FILE_REASON_ERROR: reason = "error"; break;
case MPV_END_FILE_REASON_REDIRECT: reason = "redirect"; break;
default:
reason = "unknown";
}
node_map_add_string(dst, "reason", reason);
node_map_add_int64(dst, "playlist_entry_id", eef->playlist_entry_id);
if (eef->playlist_insert_id) {
node_map_add_int64(dst, "playlist_insert_id", eef->playlist_insert_id);
node_map_add_int64(dst, "playlist_insert_num_entries",
eef->playlist_insert_num_entries);
}
if (eef->reason == MPV_END_FILE_REASON_ERROR)
node_map_add_string(dst, "file_error", mpv_error_string(eef->error));
break;
}
case MPV_EVENT_LOG_MESSAGE: {
mpv_event_log_message *msg = event->data;
node_map_add_string(dst, "prefix", msg->prefix);
node_map_add_string(dst, "level", msg->level);
node_map_add_string(dst, "text", msg->text);
break;
}
case MPV_EVENT_CLIENT_MESSAGE: {
mpv_event_client_message *msg = event->data;
struct mpv_node *args = node_map_add(dst, "args", MPV_FORMAT_NODE_ARRAY);
for (int n = 0; n < msg->num_args; n++) {
struct mpv_node *sn = node_array_add(args, MPV_FORMAT_NONE);
sn->format = MPV_FORMAT_STRING;
sn->u.string = (char *)msg->args[n];
}
break;
}
case MPV_EVENT_PROPERTY_CHANGE: {
mpv_event_property *prop = event->data;
node_map_add_string(dst, "name", prop->name);
switch (prop->format) {
case MPV_FORMAT_NODE:
*node_map_add(dst, "data", MPV_FORMAT_NONE) =
*(struct mpv_node *)prop->data;
break;
case MPV_FORMAT_DOUBLE:
node_map_add_double(dst, "data", *(double *)prop->data);
break;
case MPV_FORMAT_FLAG:
node_map_add_flag(dst, "data", *(int *)prop->data);
break;
case MPV_FORMAT_STRING:
node_map_add_string(dst, "data", *(char **)prop->data);
break;
default: ;
}
break;
}
case MPV_EVENT_COMMAND_REPLY: {
mpv_event_command *cmd = event->data;
*node_map_add(dst, "result", MPV_FORMAT_NONE) = cmd->result;
break;
}
case MPV_EVENT_HOOK: {
mpv_event_hook *hook = event->data;
node_map_add_int64(dst, "hook_id", hook->id);
break;
}
}
return 0;
}
static const char *const err_table[] = {
[-MPV_ERROR_SUCCESS] = "success",
[-MPV_ERROR_EVENT_QUEUE_FULL] = "event queue full",
[-MPV_ERROR_NOMEM] = "memory allocation failed",
[-MPV_ERROR_UNINITIALIZED] = "core not initialized",
[-MPV_ERROR_INVALID_PARAMETER] = "invalid parameter",
[-MPV_ERROR_OPTION_NOT_FOUND] = "option not found",
[-MPV_ERROR_OPTION_FORMAT] = "unsupported format for accessing option",
[-MPV_ERROR_OPTION_ERROR] = "error setting option",
[-MPV_ERROR_PROPERTY_NOT_FOUND] = "property not found",
[-MPV_ERROR_PROPERTY_FORMAT] = "unsupported format for accessing property",
[-MPV_ERROR_PROPERTY_UNAVAILABLE] = "property unavailable",
[-MPV_ERROR_PROPERTY_ERROR] = "error accessing property",
[-MPV_ERROR_COMMAND] = "error running command",
[-MPV_ERROR_LOADING_FAILED] = "loading failed",
[-MPV_ERROR_AO_INIT_FAILED] = "audio output initialization failed",
[-MPV_ERROR_VO_INIT_FAILED] = "video output initialization failed",
[-MPV_ERROR_NOTHING_TO_PLAY] = "no audio or video data played",
[-MPV_ERROR_UNKNOWN_FORMAT] = "unrecognized file format",
[-MPV_ERROR_UNSUPPORTED] = "not supported",
[-MPV_ERROR_NOT_IMPLEMENTED] = "operation not implemented",
[-MPV_ERROR_GENERIC] = "something happened",
};
const char *mpv_error_string(int error)
{
error = -error;
if (error < 0)
error = 0;
const char *name = NULL;
if (error < MP_ARRAY_SIZE(err_table))
name = err_table[error];
return name ? name : "unknown error";
}
static const char *const event_table[] = {
[MPV_EVENT_NONE] = "none",
[MPV_EVENT_SHUTDOWN] = "shutdown",
[MPV_EVENT_LOG_MESSAGE] = "log-message",
[MPV_EVENT_GET_PROPERTY_REPLY] = "get-property-reply",
[MPV_EVENT_SET_PROPERTY_REPLY] = "set-property-reply",
[MPV_EVENT_COMMAND_REPLY] = "command-reply",
[MPV_EVENT_START_FILE] = "start-file",
[MPV_EVENT_END_FILE] = "end-file",
[MPV_EVENT_FILE_LOADED] = "file-loaded",
[MPV_EVENT_IDLE] = "idle",
[MPV_EVENT_TICK] = "tick",
[MPV_EVENT_CLIENT_MESSAGE] = "client-message",
[MPV_EVENT_VIDEO_RECONFIG] = "video-reconfig",
[MPV_EVENT_AUDIO_RECONFIG] = "audio-reconfig",
[MPV_EVENT_SEEK] = "seek",
[MPV_EVENT_PLAYBACK_RESTART] = "playback-restart",
[MPV_EVENT_PROPERTY_CHANGE] = "property-change",
[MPV_EVENT_QUEUE_OVERFLOW] = "event-queue-overflow",
[MPV_EVENT_HOOK] = "hook",
};
const char *mpv_event_name(mpv_event_id event)
{
if ((unsigned)event >= MP_ARRAY_SIZE(event_table))
return NULL;
return event_table[event];
}
void mpv_free(void *data)
{
talloc_free(data);
}
int64_t mpv_get_time_ns(mpv_handle *ctx)
{
return mp_time_ns();
}
int64_t mpv_get_time_us(mpv_handle *ctx)
{
return mp_time_ns() / 1000;
}
#include "video/out/libmpv.h"
static void do_kill(void *ptr)
{
struct MPContext *mpctx = ptr;
struct track *track = mpctx->vo_chain ? mpctx->vo_chain->track : NULL;
uninit_video_out(mpctx);
if (track) {
mpctx->error_playing = MPV_ERROR_VO_INIT_FAILED;
error_on_track(mpctx, track);
}
}
// Used by vo_libmpv to (a)synchronously uninitialize video.
void kill_video_async(struct mp_client_api *client_api)
{
struct MPContext *mpctx = client_api->mpctx;
mp_dispatch_enqueue(mpctx->dispatch, do_kill, mpctx);
}
// Used by vo_libmpv to set the current render context.
bool mp_set_main_render_context(struct mp_client_api *client_api,
struct mpv_render_context *ctx, bool active)
{
assert(ctx);
mp_mutex_lock(&client_api->lock);
bool is_set = !!client_api->render_context;
bool is_same = client_api->render_context == ctx;
// Can set if it doesn't remove another existing ctx.
bool res = is_same || !is_set;
if (res)
client_api->render_context = active ? ctx : NULL;
mp_mutex_unlock(&client_api->lock);
return res;
}
// Used by vo_libmpv. Relies on guarantees by mp_render_context_acquire().
struct mpv_render_context *
mp_client_api_acquire_render_context(struct mp_client_api *ca)
{
struct mpv_render_context *res = NULL;
mp_mutex_lock(&ca->lock);
if (ca->render_context && mp_render_context_acquire(ca->render_context))
res = ca->render_context;
mp_mutex_unlock(&ca->lock);
return res;
}
// stream_cb
struct mp_custom_protocol {
char *protocol;
void *user_data;
mpv_stream_cb_open_ro_fn open_fn;
};
int mpv_stream_cb_add_ro(mpv_handle *ctx, const char *protocol, void *user_data,
mpv_stream_cb_open_ro_fn open_fn)
{
if (!open_fn)
return MPV_ERROR_INVALID_PARAMETER;
struct mp_client_api *clients = ctx->clients;
int r = 0;
mp_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_custom_protocols; n++) {
struct mp_custom_protocol *proto = &clients->custom_protocols[n];
if (strcmp(proto->protocol, protocol) == 0) {
r = MPV_ERROR_INVALID_PARAMETER;
break;
}
}
if (stream_has_proto(protocol))
r = MPV_ERROR_INVALID_PARAMETER;
if (r >= 0) {
struct mp_custom_protocol proto = {
.protocol = talloc_strdup(clients, protocol),
.user_data = user_data,
.open_fn = open_fn,
};
MP_TARRAY_APPEND(clients, clients->custom_protocols,
clients->num_custom_protocols, proto);
}
mp_mutex_unlock(&clients->lock);
return r;
}
bool mp_streamcb_lookup(struct mpv_global *g, const char *protocol,
void **out_user_data, mpv_stream_cb_open_ro_fn *out_fn)
{
struct mp_client_api *clients = g->client_api;
bool found = false;
mp_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_custom_protocols; n++) {
struct mp_custom_protocol *proto = &clients->custom_protocols[n];
if (strcmp(proto->protocol, protocol) == 0) {
*out_user_data = proto->user_data;
*out_fn = proto->open_fn;
found = true;
break;
}
}
mp_mutex_unlock(&clients->lock);
return found;
}
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