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mpv/player/client.c
wm4 ef600041ba audio, client API: check mp_make_wakeup_pipe() return value 
Could fail e.g. due to FD exhaustion.
2014-07-25 14:32:45 +02:00

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/* 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 <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <assert.h>
#include "common/common.h"
#include "common/msg.h"
#include "common/msg_control.h"
#include "input/input.h"
#include "misc/dispatch.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 "command.h"
#include "core.h"
#include "client.h"
#include "config.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;
pthread_mutex_t lock;
// -- protected by lock
struct mpv_handle **clients;
int num_clients;
};
struct observe_property {
char *name;
int64_t reply_id;
mpv_format format;
bool changed; // property change should be signaled to user
bool need_new_value; // a new value should be retrieved
bool updating; // a new value is being retrieved
bool dead; // property unobserved while retrieving value
bool new_value_valid, user_value_valid;
union m_option_value new_value, user_value;
struct mpv_handle *client;
};
struct mpv_handle {
// -- immmutable
char *name;
bool owner;
struct mp_log *log;
struct MPContext *mpctx;
struct mp_client_api *clients;
// -- not thread-safe
struct mpv_event *cur_event;
struct mpv_event_property cur_property_event;
pthread_mutex_t lock;
pthread_mutex_t wakeup_lock;
pthread_cond_t 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;
bool choke_warning;
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
struct observe_property **properties;
int num_properties;
int lowest_changed;
int properties_updating;
struct mp_log_buffer *messages;
};
static bool gen_property_change_event(struct mpv_handle *ctx);
void mp_clients_init(struct MPContext *mpctx)
{
mpctx->clients = talloc_ptrtype(NULL, mpctx->clients);
*mpctx->clients = (struct mp_client_api) {
.mpctx = mpctx,
};
pthread_mutex_init(&mpctx->clients->lock, NULL);
}
void mp_clients_destroy(struct MPContext *mpctx)
{
if (!mpctx->clients)
return;
assert(mpctx->clients->num_clients == 0);
pthread_mutex_destroy(&mpctx->clients->lock);
talloc_free(mpctx->clients);
mpctx->clients = NULL;
}
int mp_clients_num(struct MPContext *mpctx)
{
pthread_mutex_lock(&mpctx->clients->lock);
int num_clients = mpctx->clients->num_clients;
pthread_mutex_unlock(&mpctx->clients->lock);
return num_clients;
}
static struct mpv_handle *find_client(struct mp_client_api *clients,
const char *name)
{
for (int n = 0; n < clients->num_clients; n++) {
if (strcmp(clients->clients[n]->name, name) == 0)
return clients->clients[n];
}
return NULL;
}
struct mpv_handle *mp_new_client(struct mp_client_api *clients, const char *name)
{
pthread_mutex_lock(&clients->lock);
char *unique_name = NULL;
if (find_client(clients, name)) {
for (int n = 2; n < 1000; n++) {
unique_name = talloc_asprintf(NULL, "%s%d", name, n);
if (!find_client(clients, unique_name))
break;
talloc_free(unique_name);
unique_name = NULL;
}
if (!unique_name) {
pthread_mutex_unlock(&clients->lock);
return NULL;
}
}
if (!unique_name)
unique_name = talloc_strdup(NULL, name);
int num_events = 1000;
struct mpv_handle *client = talloc_ptrtype(NULL, client);
*client = (struct mpv_handle){
.name = talloc_steal(client, unique_name),
.log = mp_log_new(client, clients->mpctx->log, unique_name),
.mpctx = clients->mpctx,
.clients = clients,
.cur_event = talloc_zero(client, struct mpv_event),
.events = talloc_array(client, mpv_event, num_events),
.max_events = num_events,
.event_mask = ((uint64_t)-1) & ~(1ULL << MPV_EVENT_TICK),
.wakeup_pipe = {-1, -1},
};
pthread_mutex_init(&client->lock, NULL);
pthread_mutex_init(&client->wakeup_lock, NULL);
pthread_cond_init(&client->wakeup, NULL);
MP_TARRAY_APPEND(clients, clients->clients, clients->num_clients, client);
pthread_mutex_unlock(&clients->lock);
return client;
}
const char *mpv_client_name(mpv_handle *ctx)
{
return ctx->name;
}
struct mp_log *mp_client_get_log(struct mpv_handle *ctx)
{
return ctx->log;
}
struct MPContext *mp_client_get_core(struct mpv_handle *ctx)
{
return ctx->mpctx;
}
static void wakeup_client(struct mpv_handle *ctx)
{
pthread_mutex_lock(&ctx->wakeup_lock);
if (!ctx->need_wakeup) {
ctx->need_wakeup = true;
pthread_cond_signal(&ctx->wakeup);
if (ctx->wakeup_cb)
ctx->wakeup_cb(ctx->wakeup_cb_ctx);
if (ctx->wakeup_pipe[0] != -1)
write(ctx->wakeup_pipe[1], &(char){0}, 1);
}
pthread_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;
pthread_mutex_unlock(&ctx->lock);
pthread_mutex_lock(&ctx->wakeup_lock);
if (!ctx->need_wakeup)
r = mpthread_cond_timedwait(&ctx->wakeup, &ctx->wakeup_lock, end);
if (r == 0)
ctx->need_wakeup = false;
pthread_mutex_unlock(&ctx->wakeup_lock);
pthread_mutex_lock(&ctx->lock);
return r;
}
void mpv_set_wakeup_callback(mpv_handle *ctx, void (*cb)(void *d), void *d)
{
pthread_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);
pthread_mutex_unlock(&ctx->wakeup_lock);
}
void mpv_suspend(mpv_handle *ctx)
{
mp_dispatch_suspend(ctx->mpctx->dispatch);
}
void mpv_resume(mpv_handle *ctx)
{
mp_dispatch_resume(ctx->mpctx->dispatch);
}
static void lock_core(mpv_handle *ctx)
{
if (ctx->mpctx->initialized)
mp_dispatch_lock(ctx->mpctx->dispatch);
}
static void unlock_core(mpv_handle *ctx)
{
if (ctx->mpctx->initialized)
mp_dispatch_unlock(ctx->mpctx->dispatch);
}
void mpv_detach_destroy(mpv_handle *ctx)
{
if (!ctx)
return;
pthread_mutex_lock(&ctx->lock);
// 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.
ctx->event_mask = 0;
while (ctx->reserved_events || ctx->properties_updating)
wait_wakeup(ctx, INT64_MAX);
pthread_mutex_unlock(&ctx->lock);
struct mp_client_api *clients = ctx->clients;
pthread_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
if (clients->clients[n] == ctx) {
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);
pthread_cond_destroy(&ctx->wakeup);
pthread_mutex_destroy(&ctx->wakeup_lock);
pthread_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;
// shutdown_clients() sleeps to avoid wasting CPU
if (clients->mpctx->input)
mp_input_wakeup(clients->mpctx->input);
break;
}
}
pthread_mutex_unlock(&clients->lock);
assert(!ctx);
}
static void get_thread(void *ptr)
{
*(pthread_t *)ptr = pthread_self();
}
void mpv_terminate_destroy(mpv_handle *ctx)
{
if (!ctx)
return;
mpv_command(ctx, (const char*[]){"quit", NULL});
if (!ctx->owner) {
mpv_detach_destroy(ctx);
return;
}
mp_dispatch_lock(ctx->mpctx->dispatch);
assert(ctx->mpctx->autodetach);
ctx->mpctx->autodetach = false;
mp_dispatch_unlock(ctx->mpctx->dispatch);
pthread_t playthread;
mp_dispatch_run(ctx->mpctx->dispatch, get_thread, &playthread);
mpv_detach_destroy(ctx);
// And this is also the reason why we only allow 1 thread (the owner) to
// call this function.
pthread_join(playthread, NULL);
}
mpv_handle *mpv_create(void)
{
struct MPContext *mpctx = mp_create();
mpv_handle *ctx = mp_new_client(mpctx->clients, "main");
if (ctx) {
ctx->owner = true;
// Set some defaults.
mpv_set_option_string(ctx, "config", "no");
mpv_set_option_string(ctx, "idle", "yes");
mpv_set_option_string(ctx, "terminal", "no");
mpv_set_option_string(ctx, "osc", "no");
mpv_set_option_string(ctx, "input-default-bindings", "no");
mpv_set_option_string(ctx, "input-lirc", "no");
} else {
mp_destroy(mpctx);
}
return ctx;
}
static void *playback_thread(void *p)
{
struct MPContext *mpctx = p;
mpctx->autodetach = true;
mp_play_files(mpctx);
// This actually waits until all clients are gone before actually
// destroying mpctx.
mp_destroy(mpctx);
return NULL;
}
int mpv_initialize(mpv_handle *ctx)
{
if (mp_initialize(ctx->mpctx) < 0)
return MPV_ERROR_INVALID_PARAMETER;
pthread_t thread;
if (pthread_create(&thread, NULL, playback_thread, ctx->mpctx) != 0)
return MPV_ERROR_NOMEM;
return 0;
}
// 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;
pthread_mutex_lock(&ctx->lock);
if (ctx->reserved_events + ctx->num_events < ctx->max_events) {
ctx->reserved_events++;
res = 0;
}
pthread_mutex_unlock(&ctx->lock);
return res;
}
static int append_event(struct mpv_handle *ctx, struct mpv_event *event)
{
if (ctx->num_events + ctx->reserved_events >= ctx->max_events)
return -1;
ctx->events[(ctx->first_event + ctx->num_events) % ctx->max_events] = *event;
ctx->num_events++;
wakeup_client(ctx);
return 0;
}
static int send_event(struct mpv_handle *ctx, struct mpv_event *event)
{
pthread_mutex_lock(&ctx->lock);
if (!(ctx->event_mask & (1ULL << event->event_id))) {
pthread_mutex_unlock(&ctx->lock);
return 0;
}
int r = append_event(ctx, event);
if (r < 0 && !ctx->choke_warning) {
mp_err(ctx->log, "Too many events queued.\n");
ctx->choke_warning = true;
}
pthread_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;
pthread_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) < 0)
abort();
pthread_mutex_unlock(&ctx->lock);
}
static void status_reply(struct mpv_handle *ctx, int event,
uint64_t userdata, int status)
{
struct mpv_event reply = {
.event_id = event,
.error = status,
};
send_reply(ctx, userdata, &reply);
}
// 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_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();
}
}
void mp_client_broadcast_event(struct MPContext *mpctx, int event, void *data)
{
struct mp_client_api *clients = mpctx->clients;
pthread_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
struct mpv_event event_data = {
.event_id = event,
.data = data,
};
dup_event_data(&event_data);
send_event(clients->clients[n], &event_data);
}
pthread_mutex_unlock(&clients->lock);
}
int mp_client_send_event(struct MPContext *mpctx, const char *client_name,
int event, void *data)
{
struct mp_client_api *clients = mpctx->clients;
int r = 0;
struct mpv_event event_data = {
.event_id = event,
.data = data,
};
pthread_mutex_lock(&clients->lock);
struct mpv_handle *ctx = find_client(clients, client_name);
if (ctx) {
r = send_event(ctx, &event_data);
} else {
r = -1;
talloc_free(data);
}
pthread_mutex_unlock(&clients->lock);
return r;
}
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;
pthread_mutex_lock(&ctx->lock);
uint64_t bit = 1LLU << event;
ctx->event_mask = enable ? ctx->event_mask | bit : ctx->event_mask & ~bit;
pthread_mutex_unlock(&ctx->lock);
return 0;
}
mpv_event *mpv_wait_event(mpv_handle *ctx, double timeout)
{
mpv_event *event = ctx->cur_event;
pthread_mutex_lock(&ctx->lock);
if (timeout < 0)
timeout = 1e20;
if (ctx->queued_wakeup)
timeout = 0;
int64_t deadline = mp_add_timeout(mp_time_us(), timeout);
*event = (mpv_event){0};
talloc_free_children(event);
while (1) {
if (ctx->num_events) {
*event = ctx->events[ctx->first_event];
ctx->first_event = (ctx->first_event + 1) % ctx->max_events;
ctx->num_events--;
talloc_steal(event, event->data);
break;
}
if (gen_property_change_event(ctx))
break;
if (ctx->messages) {
// Poll the log message queue. Currently we can't/don't do better.
struct mp_log_buffer_entry *msg =
mp_msg_log_buffer_read(ctx->messages);
if (msg) {
event->event_id = MPV_EVENT_LOG_MESSAGE;
struct mpv_event_log_message *cmsg = talloc_ptrtype(event, cmsg);
*cmsg = (struct mpv_event_log_message){
.prefix = talloc_steal(event, msg->prefix),
.level = mp_log_levels[msg->level],
.text = talloc_steal(event, msg->text),
};
event->data = cmsg;
talloc_free(msg);
break;
}
}
int r = wait_wakeup(ctx, deadline);
if (r == ETIMEDOUT)
break;
}
ctx->queued_wakeup = false;
pthread_mutex_unlock(&ctx->lock);
return event;
}
void mpv_wakeup(mpv_handle *ctx)
{
pthread_mutex_lock(&ctx->lock);
ctx->queued_wakeup = true;
wakeup_client(ctx);
pthread_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 (format < 0 || 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;
}
return false;
}
// Note: for MPV_FORMAT_NODE_MAP, this (incorrectly) takes the order into
// account, instead of treating it as set.
static bool compare_value(void *a, void *b, mpv_format format)
{
switch (format) {
case MPV_FORMAT_NONE:
return true;
case MPV_FORMAT_STRING:
case MPV_FORMAT_OSD_STRING:
return strcmp(*(char **)a, *(char **)b) == 0;
case MPV_FORMAT_FLAG:
return *(int *)a == *(int *)b;
case MPV_FORMAT_INT64:
return *(int64_t *)a == *(int64_t *)b;
case MPV_FORMAT_DOUBLE:
return *(double *)a == *(double *)b;
case MPV_FORMAT_NODE: {
struct mpv_node *a_n = a, *b_n = b;
if (a_n->format != b_n->format)
return false;
return compare_value(&a_n->u, &b_n->u, a_n->format);
}
case MPV_FORMAT_NODE_ARRAY:
case MPV_FORMAT_NODE_MAP:
{
mpv_node_list *l_a = *(mpv_node_list **)a, *l_b = *(mpv_node_list **)b;
if (l_a->num != l_b->num)
return false;
for (int n = 0; n < l_a->num; n++) {
if (!compare_value(&l_a->values[n], &l_b->values[n], MPV_FORMAT_NODE))
return false;
if (format == MPV_FORMAT_NODE_MAP) {
if (strcmp(l_a->keys[n], l_b->keys[n]) != 0)
return false;
}
}
return true;
}
}
abort();
}
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)
{
int flags = ctx->mpctx->initialized ? M_SETOPT_RUNTIME : 0;
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);
format = MPV_FORMAT_NODE;
data = &tmp;
}
lock_core(ctx);
int err = m_config_set_option_node(ctx->mpctx->mconfig, bstr0(name),
data, flags);
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.
// Note: once some things are fixed (like vo_opengl not being safe to be
// called from any thread other than the playback thread), this can
// be replaced by a simpler method.
static void run_locked(mpv_handle *ctx, void (*fn)(void *fn_data), void *fn_data)
{
mp_dispatch_run(ctx->mpctx->dispatch, fn, fn_data);
}
// 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_autofree(ctx->mpctx->dispatch, fn, fn_data);
return 0;
}
struct cmd_request {
struct MPContext *mpctx;
struct mp_cmd *cmd;
int status;
struct mpv_handle *reply_ctx;
uint64_t userdata;
};
static void cmd_fn(void *data)
{
struct cmd_request *req = data;
int r = run_command(req->mpctx, req->cmd);
req->status = r >= 0 ? 0 : MPV_ERROR_COMMAND;
talloc_free(req->cmd);
if (req->reply_ctx) {
status_reply(req->reply_ctx, MPV_EVENT_COMMAND_REPLY,
req->userdata, req->status);
}
}
static int run_client_command(mpv_handle *ctx, struct mp_cmd *cmd)
{
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
if (!cmd)
return MPV_ERROR_INVALID_PARAMETER;
struct cmd_request req = {
.mpctx = ctx->mpctx,
.cmd = cmd,
};
run_locked(ctx, cmd_fn, &req);
return req.status;
}
int mpv_command(mpv_handle *ctx, const char **args)
{
return run_client_command(ctx, mp_input_parse_cmd_strv(ctx->log, 0, args,
ctx->name));
}
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));
}
int mpv_command_async(mpv_handle *ctx, uint64_t ud, const char **args)
{
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
struct mp_cmd *cmd = mp_input_parse_cmd_strv(ctx->log, 0, args, "<client>");
if (!cmd)
return MPV_ERROR_INVALID_PARAMETER;
struct cmd_request *req = talloc_ptrtype(NULL, req);
*req = (struct cmd_request){
.mpctx = ctx->mpctx,
.cmd = cmd,
.reply_ctx = ctx,
.userdata = ud,
};
return run_async(ctx, cmd_fn, req);
}
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);
int err;
switch (req->format) {
case MPV_FORMAT_STRING: {
// Go through explicit string conversion. M_PROPERTY_SET_NODE doesn't
// do this, because it tries to be somewhat type-strict. But the client
// needs a way to set everything by string.
char *s = *(char **)req->data;
err = mp_property_do(req->name, M_PROPERTY_SET_STRING, s, req->mpctx);
break;
}
case MPV_FORMAT_NODE:
case MPV_FORMAT_FLAG:
case MPV_FORMAT_INT64:
case MPV_FORMAT_DOUBLE: {
struct mpv_node node;
if (req->format == MPV_FORMAT_NODE) {
node = *(struct mpv_node *)req->data;
} else {
// These are basically emulated via mpv_node.
node.format = req->format;
memcpy(&node.u, req->data, type->type->size);
}
err = mp_property_do(req->name, M_PROPERTY_SET_NODE, &node, req->mpctx);
break;
}
default:
abort();
}
req->status = translate_property_error(err);
if (req->reply_ctx) {
status_reply(req->reply_ctx, MPV_EVENT_SET_PROPERTY_REPLY,
req->userdata, req->status);
}
}
int mpv_set_property(mpv_handle *ctx, const char *name, mpv_format format,
void *data)
{
if (!ctx->mpctx->initialized)
return MPV_ERROR_UNINITIALIZED;
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_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 = {0};
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 **)req->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,
.reply_userdata = req->userdata,
};
send_reply(req->reply_ctx, req->userdata, &reply);
}
}
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;
const struct m_option *type = get_mp_type_get(prop->format);
if (type) {
m_option_free(type, &prop->new_value);
m_option_free(type, &prop->user_value);
}
}
int mpv_observe_property(mpv_handle *ctx, uint64_t userdata,
const char *name, mpv_format format)
{
if (format != MPV_FORMAT_NONE && !get_mp_type_get(format))
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;
pthread_mutex_lock(&ctx->lock);
struct observe_property *prop = talloc_ptrtype(ctx, prop);
talloc_set_destructor(prop, property_free);
*prop = (struct observe_property){
.client = ctx,
.name = talloc_strdup(prop, name),
.reply_id = userdata,
.format = format,
.changed = true,
.need_new_value = true,
};
MP_TARRAY_APPEND(ctx, ctx->properties, ctx->num_properties, prop);
ctx->lowest_changed = 0;
pthread_mutex_unlock(&ctx->lock);
return 0;
}
int mpv_unobserve_property(mpv_handle *ctx, uint64_t userdata)
{
pthread_mutex_lock(&ctx->lock);
int count = 0;
for (int n = ctx->num_properties - 1; n >= 0; n--) {
struct observe_property *prop = ctx->properties[n];
if (prop->reply_id == userdata) {
if (prop->updating) {
prop->dead = true;
} else {
// In case mpv_unobserve_property() is called after mpv_wait_event()
// returned, and the mpv_event still references the name somehow,
// make sure it's not freed while in use. The same can happen
// with the value update mechanism.
talloc_steal(ctx->cur_event, prop);
}
MP_TARRAY_REMOVE_AT(ctx->properties, ctx->num_properties, n);
count++;
}
}
ctx->lowest_changed = 0;
pthread_mutex_unlock(&ctx->lock);
return count;
}
static int prefix_len(const char *p)
{
const char *end = strchr(p, '/');
return end ? end - p : strlen(p);
}
static bool match_property(const char *a, const char *b)
{
if (strcmp(b, "*") == 0)
return true;
int len_a = prefix_len(a);
int len_b = prefix_len(b);
return strncmp(a, b, MPMIN(len_a, len_b)) == 0;
}
// Broadcast that properties have changed.
void mp_client_property_change(struct MPContext *mpctx, const char *const *list)
{
struct mp_client_api *clients = mpctx->clients;
pthread_mutex_lock(&clients->lock);
for (int n = 0; n < clients->num_clients; n++) {
struct mpv_handle *client = clients->clients[n];
pthread_mutex_lock(&client->lock);
client->lowest_changed = client->num_properties;
for (int i = 0; i < client->num_properties; i++) {
struct observe_property *prop = client->properties[i];
if (!prop->changed && !prop->need_new_value) {
for (int x = 0; list && list[x]; x++) {
if (match_property(prop->name, list[x])) {
prop->changed = true;
prop->need_new_value = prop->format != 0;
break;
}
}
}
if ((prop->changed || prop->updating) && i < client->lowest_changed)
client->lowest_changed = i;
}
if (client->lowest_changed < client->num_properties)
wakeup_client(client);
pthread_mutex_unlock(&client->lock);
}
pthread_mutex_unlock(&clients->lock);
}
static void update_prop(void *p)
{
struct observe_property *prop = p;
struct mpv_handle *ctx = prop->client;
const struct m_option *type = get_mp_type_get(prop->format);
union m_option_value val = {0};
struct getproperty_request req = {
.mpctx = ctx->mpctx,
.name = prop->name,
.format = prop->format,
.data = &val,
};
getproperty_fn(&req);
pthread_mutex_lock(&ctx->lock);
ctx->properties_updating--;
prop->updating = false;
m_option_free(type, &prop->new_value);
prop->new_value_valid = req.status >= 0;
if (prop->new_value_valid)
memcpy(&prop->new_value, &val, type->type->size);
if (prop->user_value_valid != prop->new_value_valid) {
prop->changed = true;
} else if (prop->user_value_valid && prop->new_value_valid) {
if (!compare_value(&prop->user_value, &prop->new_value, prop->format))
prop->changed = true;
}
if (prop->dead)
talloc_steal(ctx->cur_event, prop);
wakeup_client(ctx);
pthread_mutex_unlock(&ctx->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;
int start = ctx->lowest_changed;
ctx->lowest_changed = ctx->num_properties;
for (int n = start; n < ctx->num_properties; n++) {
struct observe_property *prop = ctx->properties[n];
if ((prop->changed || prop->updating) && n < ctx->lowest_changed)
ctx->lowest_changed = n;
if (prop->changed) {
bool get_value = prop->need_new_value;
prop->need_new_value = false;
prop->changed = false;
if (prop->format && get_value) {
ctx->properties_updating++;
prop->updating = true;
mp_dispatch_enqueue(ctx->mpctx->dispatch, update_prop, prop);
} else {
const struct m_option *type = get_mp_type_get(prop->format);
prop->user_value_valid = prop->new_value_valid;
if (prop->new_value_valid)
m_option_copy(type, &prop->user_value, &prop->new_value);
ctx->cur_property_event = (struct mpv_event_property){
.name = prop->name,
.format = prop->user_value_valid ? prop->format : 0,
};
if (prop->user_value_valid)
ctx->cur_property_event.data = &prop->user_value;
*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_load_config_file(mpv_handle *ctx, const char *filename)
{
int flags = ctx->mpctx->initialized ? M_SETOPT_RUNTIME : 0;
lock_core(ctx);
int r = m_config_parse_config_file(ctx->mpctx->mconfig, filename, NULL, flags);
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);
}
int mpv_request_log_messages(mpv_handle *ctx, const char *min_level)
{
int level = -1;
for (int n = 0; n < MSGL_MAX + 1; n++) {
if (mp_log_levels[n] && strcmp(min_level, mp_log_levels[n]) == 0) {
level = n;
break;
}
}
if (level < 0 && strcmp(min_level, "no") != 0)
return MPV_ERROR_INVALID_PARAMETER;
pthread_mutex_lock(&ctx->lock);
mp_msg_log_buffer_destroy(ctx->messages);
ctx->messages = NULL;
if (level >= 0) {
int size = level >= MSGL_V ? 10000 : 1000;
ctx->messages = mp_msg_log_buffer_new(ctx->mpctx->global, size, level,
msg_wakeup, ctx);
}
pthread_mutex_unlock(&ctx->lock);
return 0;
}
int mpv_get_wakeup_pipe(mpv_handle *ctx)
{
pthread_mutex_lock(&ctx->wakeup_lock);
if (ctx->wakeup_pipe[0] == -1) {
if (mp_make_wakeup_pipe(ctx->wakeup_pipe) >= 0)
write(ctx->wakeup_pipe[1], &(char){0}, 1);
}
int fd = ctx->wakeup_pipe[0];
pthread_mutex_unlock(&ctx->wakeup_lock);
return fd;
}
unsigned long mpv_client_api_version(void)
{
return MPV_CLIENT_API_VERSION;
}
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 uninitialized",
[-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",
};
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_TRACKS_CHANGED] = "tracks-changed",
[MPV_EVENT_TRACK_SWITCHED] = "track-switched",
[MPV_EVENT_IDLE] = "idle",
[MPV_EVENT_PAUSE] = "pause",
[MPV_EVENT_UNPAUSE] = "unpause",
[MPV_EVENT_TICK] = "tick",
[MPV_EVENT_SCRIPT_INPUT_DISPATCH] = "script-input-dispatch",
[MPV_EVENT_CLIENT_MESSAGE] = "client-message",
[MPV_EVENT_VIDEO_RECONFIG] = "video-reconfig",
[MPV_EVENT_AUDIO_RECONFIG] = "audio-reconfig",
[MPV_EVENT_METADATA_UPDATE] = "metadata-update",
[MPV_EVENT_SEEK] = "seek",
[MPV_EVENT_PLAYBACK_RESTART] = "playback-restart",
[MPV_EVENT_PROPERTY_CHANGE] = "property-change",
[MPV_EVENT_CHAPTER_CHANGE] = "chapter-change",
};
const char *mpv_event_name(mpv_event_id event)
{
if (event < 0 || 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_us(mpv_handle *ctx)
{
return mp_time_us();
}
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