| 1 |
=head1 NAME |
| 2 |
|
| 3 |
AnyEvent::MPV - remote control mpv (https://mpv.io) |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use AnyEvent::MPV; |
| 8 |
|
| 9 |
=head1 DESCRIPTION |
| 10 |
|
| 11 |
This module allows you to remote control F<mpv> (a video player). It also |
| 12 |
is an L<AnyEvent> user, you need to make sure that you use and run a |
| 13 |
supported event loop. |
| 14 |
|
| 15 |
There are other modules doing this, and I haven't looked much at them |
| 16 |
other than to decide that they don't handle encodings correctly, and since |
| 17 |
none of them use AnyEvent, I wrote my own. When in doubt, have a look at |
| 18 |
them, too. |
| 19 |
|
| 20 |
Knowledge of the L<mpv command |
| 21 |
interface|https://mpv.io/manual/stable/#command-interface> is required to |
| 22 |
use this module. |
| 23 |
|
| 24 |
Features of this module are: |
| 25 |
|
| 26 |
=over |
| 27 |
|
| 28 |
=item uses AnyEvent, so integrates well into most event-based programs |
| 29 |
|
| 30 |
=item supports asynchronous and synchronous operation |
| 31 |
|
| 32 |
=item allows you to properly pass binary filenames |
| 33 |
|
| 34 |
=item accepts data encoded in any way (does not crash when mpv replies with non UTF-8 data) |
| 35 |
|
| 36 |
=item features a simple keybind/event system |
| 37 |
|
| 38 |
=back |
| 39 |
|
| 40 |
=head2 OVERVIEW OF OPERATION |
| 41 |
|
| 42 |
This module forks an F<mpv> process and uses F<--input-ipc-client> (or |
| 43 |
equivalent) to create a bidirectional communication channel between it and |
| 44 |
the F<mpv> process. |
| 45 |
|
| 46 |
It then speaks the somewhat JSON-looking (but not really being JSON) |
| 47 |
protocol that F<mpv> implements to both send it commands, decode and |
| 48 |
handle replies, and handle asynchronous events. |
| 49 |
|
| 50 |
Here is a very simple client: |
| 51 |
|
| 52 |
use AnyEvent; |
| 53 |
use AnyEvent::MPV; |
| 54 |
|
| 55 |
my $videofile = "./xyzzy.mp4"; |
| 56 |
|
| 57 |
my $mpv = AnyEvent::MPV->new (trace => 1); |
| 58 |
|
| 59 |
$mpv->start ("--", $videofile); |
| 60 |
|
| 61 |
my $timer = AE::timer 2, 0, my $quit = AE::cv; |
| 62 |
$quit->recv; |
| 63 |
|
| 64 |
This starts F<mpv> with the two arguments C<--> and C<$videofile>, which |
| 65 |
it should load and play. It then waits two seconds by starting a timer and |
| 66 |
quits. The C<trace> argument to the constructor makes F<mpv> more verbose |
| 67 |
and also prints the commands and responses, so you cna have an idea what |
| 68 |
is going on. |
| 69 |
|
| 70 |
This is not usually very useful (you could just run F<mpv> as a simple |
| 71 |
shell command), so let us load the file at runtime: |
| 72 |
|
| 73 |
use AnyEvent; |
| 74 |
use AnyEvent::MPV; |
| 75 |
|
| 76 |
my $videofile = "./xyzzy.mp4"; |
| 77 |
|
| 78 |
my $mpv = AnyEvent::MPV->new ( |
| 79 |
trace => 1, |
| 80 |
args => ["--pause", "--idle=yes"], |
| 81 |
); |
| 82 |
|
| 83 |
$mpv->start; |
| 84 |
$mpv->cmd_recv (loadfile => $mpv->escape_binary ($videofile)); |
| 85 |
$mpv->cmd ("set", "pause", "no"); |
| 86 |
|
| 87 |
my $timer = AE::timer 2, 0, my $quit = AE::cv; |
| 88 |
$quit->recv; |
| 89 |
|
| 90 |
This specifies extra arguments in the constructor - these arguments are |
| 91 |
used every time you C<< ->start >> F<mpv>, while the arguments to C<< |
| 92 |
->start >> are only used for this specific clal to0 C<start>. The argument |
| 93 |
F<--pause> keeps F<mpv> in pause mode (i.e. it does not play the file |
| 94 |
after loading it), and C<--idle=yes> tells F<mpv> to not quit when it does |
| 95 |
not have a playlist - as no files are specified on the command line. |
| 96 |
|
| 97 |
To load a file, we then send it a C<loadfile> command, which accepts, as |
| 98 |
first argument, the URL or path to a video file. To make sure F<mpv> does |
| 99 |
not misinterpret the path as a URL, it was prefixed with F<./> (similarly |
| 100 |
to "protecting" paths in perls C<open>). |
| 101 |
|
| 102 |
Since commands send I<to> F<mpv> are send in UTF-8, we need to escape the |
| 103 |
filename (which might be in any encoding) using the C<esscape_binary> |
| 104 |
method - this is not needed if your filenames are just ascii, or magically |
| 105 |
get interpreted correctly, but if you accept arbitrary filenamews (e.g. |
| 106 |
from the user), you need to do this. |
| 107 |
|
| 108 |
The C<cmd_recv> method then queues the command, waits for a reply and |
| 109 |
returns the reply data (or croaks on error). F<mpv> would, at this point, |
| 110 |
load the file and, if everything was successful, show the first frame and |
| 111 |
pause. Note that, since F<mpv> is implement rather synchronously itself, |
| 112 |
do not expect commands to fail in many circumstances - for example, fit |
| 113 |
he file does not exit, you will likely get an event, but the C<loadfile> |
| 114 |
command itself will run successfully. |
| 115 |
|
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To unpause, we send another command, C<set>, to set the C<pause> property |
| 117 |
to C<no>, this time using the C<cmd> method, which queues the command, but |
| 118 |
instead of waiting for a reply, it immediately returns a condvar that cna |
| 119 |
be used to receive results. |
| 120 |
|
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This should then cause F<mpv> to start playing the video. |
| 122 |
|
| 123 |
It then again waits two seconds and quits. |
| 124 |
|
| 125 |
Now, just waiting two seconds is rather, eh, unuseful, so let's look at |
| 126 |
receiving events (using a somewhat embellished example): |
| 127 |
|
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use AnyEvent; |
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use AnyEvent::MPV; |
| 130 |
|
| 131 |
my $videofile = "xyzzy.mp4"; |
| 132 |
|
| 133 |
my $quit = AE::cv; |
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|
| 135 |
my $mpv = AnyEvent::MPV->new ( |
| 136 |
trace => 1, |
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args => ["--pause", "--idle=yes"], |
| 138 |
on_event => sub { |
| 139 |
my ($mpv, $event, $data) = @_; |
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|
| 141 |
if ($event eq "start-file") { |
| 142 |
$mpv->cmd ("set", "pause", "no"); |
| 143 |
} elsif ($event eq "end-file") { |
| 144 |
print "end-file<$data->{reason}>\n"; |
| 145 |
$quit->send; |
| 146 |
} |
| 147 |
}, |
| 148 |
); |
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|
| 150 |
$mpv->start; |
| 151 |
$mpv->cmd (loadfile => $mpv->escape_binary ($videofile)); |
| 152 |
|
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$quit->recv; |
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|
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This example uses a global condvar C<$quit> to wait for the file to finish |
| 156 |
playing. Also, most of the logic is now in an C<on_event> callback, which |
| 157 |
receives an event name and the actual event object. |
| 158 |
|
| 159 |
The two events we handle are C<start-file>, which is emitted by F<mpv> |
| 160 |
once it has loaded a new file, and C<end-file>, which signals the end |
| 161 |
of a file. |
| 162 |
|
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In the former event, we again set the C<pause> property to C<no> so the |
| 164 |
movie starts playing. For the latter event, we tell the main program to |
| 165 |
quit by invoking C<$quit>. |
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|
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This should conclude the basics of operation. There are a few more |
| 168 |
examples later in the documentation. |
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|
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=head2 ENCODING CONVENTIONS |
| 171 |
|
| 172 |
As a rule of thumb, all data you pass to this module to be sent to F<mpv> |
| 173 |
is expected to be in unicode. To pass something that isn't, you need to |
| 174 |
escape it using C<escape_binary>. |
| 175 |
|
| 176 |
Data received from C<$mpv>, however, is I<not> decoded to unicode, as data |
| 177 |
returned by F<mpv> is not generally encoded in unicode, and the encoding |
| 178 |
is usually unspecified. So if you receive data and expect it to be in |
| 179 |
unicode, you need to first decode it from UTF-8, but note that this might |
| 180 |
fail. This is not a limitation of this module - F<mpv> simply does not |
| 181 |
specify nor guarantee a specific encoding, or any encoding at all, in its |
| 182 |
protocol. |
| 183 |
|
| 184 |
=head2 METHODS |
| 185 |
|
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=over |
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|
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=cut |
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|
| 190 |
package AnyEvent::MPV; |
| 191 |
|
| 192 |
use common::sense; |
| 193 |
|
| 194 |
use Fcntl (); |
| 195 |
use Scalar::Util (); |
| 196 |
|
| 197 |
use AnyEvent (); |
| 198 |
use AnyEvent::Util (); |
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|
| 200 |
our $JSON = eval { require JSON::XS; JSON::XS:: } |
| 201 |
|| do { require JSON::PP; JSON::PP:: }; |
| 202 |
|
| 203 |
our $JSON_CODER = |
| 204 |
|
| 205 |
our $VERSION = '0.1'; |
| 206 |
|
| 207 |
our $mpv_path; # last mpv path used |
| 208 |
our $mpv_optionlist; # output of mpv --list-options |
| 209 |
|
| 210 |
=item $mpv = AnyEvent::MPV->new (key => value...) |
| 211 |
|
| 212 |
Creates a new C<mpv> object, but does not yet do anything. The support key-value pairs are: |
| 213 |
|
| 214 |
=over |
| 215 |
|
| 216 |
=item mpv => $path |
| 217 |
|
| 218 |
The path to the F<mpv> binary to use - by default, C<mpv> is used and |
| 219 |
therefore, uses your C<PATH> to find it. |
| 220 |
|
| 221 |
=item args => [...] |
| 222 |
|
| 223 |
Arguments to pass to F<mpv>. These arguments are passed after the |
| 224 |
hardcoded arguments used by this module, but before the arguments passed |
| 225 |
ot C<start>. It does not matter whether you specify your arguments using |
| 226 |
this key, or in the C<start> call, but when you invoke F<mpv> multiple |
| 227 |
times, typically the arguments used for all invocations go here, while |
| 228 |
arguments used for specific invocations (e..g filenames) are passed to |
| 229 |
C<start>. |
| 230 |
|
| 231 |
=item trace => false|true|coderef |
| 232 |
|
| 233 |
Enables tracing if true. In trace mode, output from F<mpv> is printed to |
| 234 |
standard error using a C<< mpv> >> prefix, and commands sent to F<mpv> |
| 235 |
are printed with a C<< >mpv >> prefix. |
| 236 |
|
| 237 |
If a code reference is passed, then instead of printing to standard |
| 238 |
errort, this coderef is invoked with a first arfgument being either |
| 239 |
C<< mpv> >> or C<< >mpv >>, and the second argument being a string to |
| 240 |
display. The default implementation simply does this: |
| 241 |
|
| 242 |
sub { |
| 243 |
warn "$_[0] $_[1]\n"; |
| 244 |
} |
| 245 |
|
| 246 |
=item on_eof => $coderef->($mpv) |
| 247 |
|
| 248 |
=item on_event => $coderef->($mpv, $event, $data) |
| 249 |
|
| 250 |
=item on_key => $coderef->($mpv, $string) |
| 251 |
|
| 252 |
These are invoked by the default method implementation of the same name - |
| 253 |
see below. |
| 254 |
|
| 255 |
=back |
| 256 |
|
| 257 |
=cut |
| 258 |
|
| 259 |
sub new { |
| 260 |
my ($class, %kv) = @_; |
| 261 |
|
| 262 |
bless { |
| 263 |
mpv => "mpv", |
| 264 |
args => [], |
| 265 |
%kv, |
| 266 |
}, $class |
| 267 |
} |
| 268 |
|
| 269 |
=item $string = $mpv->escape_binary ($string) |
| 270 |
|
| 271 |
This module excects all command data sent to F<mpv> to be in unicode. Some |
| 272 |
things are not, such as filenames. To pass binary data such as filenames |
| 273 |
through a comamnd, you need to escape it using this method. |
| 274 |
|
| 275 |
The simplest example is a C<loadfile> command: |
| 276 |
|
| 277 |
$mpv->cmd_recv (loadfile => $mpv->escape_binary ($path)); |
| 278 |
|
| 279 |
=cut |
| 280 |
|
| 281 |
# can be used to escape filenames |
| 282 |
sub escape_binary { |
| 283 |
shift; |
| 284 |
local $_ = shift; |
| 285 |
# we escape every "illegal" octet using U+10e5df HEX. this is later undone in cmd |
| 286 |
s/([\x00-\x1f\x80-\xff])/sprintf "\x{10e5df}%02x", ord $1/ge; |
| 287 |
$_ |
| 288 |
} |
| 289 |
|
| 290 |
=item $started = $mpv->start (argument...) |
| 291 |
|
| 292 |
Starts F<mpv>, passing the given arguemnts as extra arguments to |
| 293 |
F<mpv>. If F<mpv> is already running, it returns false, otherwise it |
| 294 |
returns a true value, so you can easily start F<mpv> on demand by calling |
| 295 |
C<start> just before using it, and if it is already running, it will not |
| 296 |
be started again. |
| 297 |
|
| 298 |
The arguments passwd to F<mpv> are a set of hardcoded built-in arguments, |
| 299 |
followed by the arguments specified in the constructor, followed by the |
| 300 |
arguments passwd to this method. The built-in arguments currently are |
| 301 |
F<--no-input-terminal>, F<--really-quiet> (or F<--quiet> in C<trace> |
| 302 |
mode), and C<--input-ipc-client> (or equivalent). |
| 303 |
|
| 304 |
Some commonly used and/or even useful arguments you might want to pass are: |
| 305 |
|
| 306 |
=over |
| 307 |
|
| 308 |
=item F<--idle=yes> or F<--idle=once> to keep F<mpv> from quitting when you |
| 309 |
don't specify a file to play. |
| 310 |
|
| 311 |
=item F<--pause>, to keep F<mpv> from instantly starting to play a file, in case you want to |
| 312 |
inspect/change properties first. |
| 313 |
|
| 314 |
=item F<--force-window=no> (or similar), to keep F<mpv> from instantly opening a window, or to force it to do so. |
| 315 |
|
| 316 |
=item F<--audio-client-name=yourappname>, to make sure audio streams are associated witht eh right program. |
| 317 |
|
| 318 |
=item F<--wid=id>, to embed F<mpv> into another application. |
| 319 |
|
| 320 |
=item F<--no-terminal>, F<--no-input-default-bindings>, F<--no-input-cursor>, F<--input-conf=/dev/null>, F<--input-vo-keyboard=no> - to ensure only you control input. |
| 321 |
|
| 322 |
=back |
| 323 |
|
| 324 |
The return value can be used to decide whether F<mpv> needs initializing: |
| 325 |
|
| 326 |
if ($mpv->start) { |
| 327 |
$mpv->bind_key (...); |
| 328 |
$mpv->cmd (set => property => value); |
| 329 |
... |
| 330 |
} |
| 331 |
|
| 332 |
You can immediately starting sending commands when this method returns, |
| 333 |
even if F<mpv> has not yet started. |
| 334 |
|
| 335 |
=cut |
| 336 |
|
| 337 |
sub start { |
| 338 |
my ($self, @extra_args) = @_; |
| 339 |
|
| 340 |
return 0 if $self->{fh}; |
| 341 |
|
| 342 |
# cache optionlist for same "path" |
| 343 |
($mpv_path, $mpv_optionlist) = ($self->{mpv}, scalar qx{\Q$self->{mpv}\E --list-options}) |
| 344 |
if $self->{mpv} ne $mpv_path; |
| 345 |
|
| 346 |
my $options = $mpv_optionlist; |
| 347 |
|
| 348 |
my ($fh, $slave) = AnyEvent::Util::portable_socketpair |
| 349 |
or die "socketpair: $!\n"; |
| 350 |
|
| 351 |
AnyEvent::Util::fh_nonblocking $fh, 1; |
| 352 |
|
| 353 |
$self->{pid} = fork; |
| 354 |
|
| 355 |
if ($self->{pid} eq 0) { |
| 356 |
AnyEvent::Util::fh_nonblocking $slave, 0; |
| 357 |
fcntl $slave, Fcntl::F_SETFD, 0; |
| 358 |
|
| 359 |
my $input_file = $options =~ /\s--input-ipc-client\s/ ? "input-ipc-client" : "input-file"; |
| 360 |
|
| 361 |
exec $self->{mpv}, |
| 362 |
qw(--no-input-terminal), |
| 363 |
($self->{trace} ? "--quiet" : "--really-quiet"), |
| 364 |
"--$input_file=fd://" . (fileno $slave), |
| 365 |
@{ $self->{args} }, |
| 366 |
@extra_args; |
| 367 |
exit 1; |
| 368 |
} |
| 369 |
|
| 370 |
$self->{fh} = $fh; |
| 371 |
|
| 372 |
my $trace = delete $self->{trace} || sub { }; |
| 373 |
|
| 374 |
$trace = sub { warn "$_[0] $_[1]\n" } if $trace && !ref $trace; |
| 375 |
|
| 376 |
my $buf; |
| 377 |
my $wbuf; |
| 378 |
|
| 379 |
Scalar::Util::weaken $self; |
| 380 |
|
| 381 |
$self->{rw} = AE::io $fh, 0, sub { |
| 382 |
if (sysread $fh, $buf, 8192, length $buf) { |
| 383 |
while ($buf =~ s/^([^\n]+)\n//) { |
| 384 |
$trace->("mpv>" => "$1"); |
| 385 |
|
| 386 |
if ("{" eq substr $1, 0, 1) { |
| 387 |
eval { |
| 388 |
my $reply = $JSON->new->latin1->decode ($1); |
| 389 |
|
| 390 |
if (exists $reply->{event}) { |
| 391 |
if ( |
| 392 |
$reply->{event} eq "client-message" |
| 393 |
and $reply->{args}[0] eq "AnyEvent::MPV" |
| 394 |
) { |
| 395 |
if ($reply->{args}[1] eq "key") { |
| 396 |
(my $key = $reply->{args}[2]) =~ s/\\x(..)/chr hex $1/ge; |
| 397 |
$self->on_key ($key); |
| 398 |
} |
| 399 |
} else { |
| 400 |
$self->on_event ($reply->{event}, $reply); |
| 401 |
} |
| 402 |
} elsif (exists $reply->{request_id}) { |
| 403 |
my $cv = delete $self->{cmd_cv}{$reply->{request_id}}; |
| 404 |
|
| 405 |
unless ($cv) { |
| 406 |
warn "no cv found for request id <$reply->{request_id}>\n"; |
| 407 |
next; |
| 408 |
} |
| 409 |
|
| 410 |
if (exists $reply->{data}) { |
| 411 |
$cv->send ($reply->{data}); |
| 412 |
} elsif ($reply->{error} eq "success") { # success means error... eh.. no... |
| 413 |
$cv->send; |
| 414 |
} else { |
| 415 |
$cv->croak ($reply->{error}); |
| 416 |
} |
| 417 |
|
| 418 |
} else { |
| 419 |
warn "unexpected reply from mpv, pleasew report: <$1>\n"; |
| 420 |
} |
| 421 |
}; |
| 422 |
warn $@ if $@; |
| 423 |
} else { |
| 424 |
$trace->("mpv>" => "$1"); |
| 425 |
} |
| 426 |
} |
| 427 |
} else { |
| 428 |
$self->stop; |
| 429 |
$self->on_eof; |
| 430 |
} |
| 431 |
}; |
| 432 |
|
| 433 |
$self->{_send} = sub { |
| 434 |
$wbuf .= "$_[0]\n"; |
| 435 |
|
| 436 |
$trace->(">mpv" => "$_[0]"); |
| 437 |
|
| 438 |
$self->{ww} ||= AE::io $fh, 1, sub { |
| 439 |
my $len = syswrite $fh, $wbuf; |
| 440 |
substr $wbuf, 0, $len, ""; |
| 441 |
undef $self->{ww} unless length $wbuf; |
| 442 |
}; |
| 443 |
}; |
| 444 |
|
| 445 |
1 |
| 446 |
} |
| 447 |
|
| 448 |
=item $mpv->stop |
| 449 |
|
| 450 |
Ensures that F<mpv> is being stopped, by killing F<mpv> with a C<TERM> |
| 451 |
signal if needed. After this, you can C<< ->start >> a new instance again. |
| 452 |
|
| 453 |
=cut |
| 454 |
|
| 455 |
sub stop { |
| 456 |
my ($self) = @_; |
| 457 |
|
| 458 |
delete $self->{rw}; |
| 459 |
delete $self->{ww}; |
| 460 |
|
| 461 |
if ($self->{pid}) { |
| 462 |
|
| 463 |
close delete $self->{fh}; # current mpv versions should cleanup on their own on close |
| 464 |
|
| 465 |
kill TERM => $self->{pid}; |
| 466 |
|
| 467 |
} |
| 468 |
|
| 469 |
delete $self->{pid}; |
| 470 |
delete $self->{cmd_cv}; |
| 471 |
} |
| 472 |
|
| 473 |
=item $mpv->on_eof |
| 474 |
|
| 475 |
This method is called when F<mpv> quits - usually unexpectedly. The |
| 476 |
default implementation will call the C<on_eof> code reference specified in |
| 477 |
the constructor, or do nothing if none was given. |
| 478 |
|
| 479 |
For subclassing, see I<SUBCLASSING>, below. |
| 480 |
|
| 481 |
=cut |
| 482 |
|
| 483 |
sub on_eof { |
| 484 |
my ($self) = @_; |
| 485 |
|
| 486 |
$self->{on_eof}($self) if $self->{on_eof}; |
| 487 |
} |
| 488 |
|
| 489 |
=item $mpv->on_event ($event, $data) |
| 490 |
|
| 491 |
This method is called when F<mpv> sends an asynchronous event. The default |
| 492 |
implementation will call the C<on_event> code reference specified in the |
| 493 |
constructor, or do nothing if none was given. |
| 494 |
|
| 495 |
The first/implicit argument is the C<$mpv> object, the second is the event |
| 496 |
name (same as C<< $data->{event} >>, purely for convenience), and the |
| 497 |
third argument is the full event object as sent by F<mpv>. See L<List of |
| 498 |
events|https://mpv.io/manual/stable/#list-of-events> in its documentation. |
| 499 |
|
| 500 |
For subclassing, see I<SUBCLASSING>, below. |
| 501 |
|
| 502 |
=cut |
| 503 |
|
| 504 |
sub on_event { |
| 505 |
my ($self, $key) = @_; |
| 506 |
|
| 507 |
$self->{on_event}($self, $key) if $self->{on_event}; |
| 508 |
} |
| 509 |
|
| 510 |
=item $mpv->on_key ($string) |
| 511 |
|
| 512 |
Invoked when a key declared by C<< ->bind_key >> is pressed. The default |
| 513 |
invokes the C<on_key> code reference specified in the constructor with the |
| 514 |
C<$mpv> object and the key name as arguments, or do nothing if none was |
| 515 |
given. |
| 516 |
|
| 517 |
For more details and examples, see the C<bind_key> method. |
| 518 |
|
| 519 |
For subclassing, see I<SUBCLASSING>, below. |
| 520 |
|
| 521 |
=cut |
| 522 |
|
| 523 |
sub on_key { |
| 524 |
my ($self, $key) = @_; |
| 525 |
|
| 526 |
$self->{on_key}($self, $key) if $self->{on_key}; |
| 527 |
} |
| 528 |
|
| 529 |
=item $mpv->cmd ($command => $arg, $arg...) |
| 530 |
|
| 531 |
Queues a command to be sent to F<mpv>, using the given arguments, and |
| 532 |
immediately return a condvar. |
| 533 |
|
| 534 |
See L<the mpv |
| 535 |
documentation|https://mpv.io/manual/stable/#list-of-input-commands> for |
| 536 |
details on individual commands. |
| 537 |
|
| 538 |
The condvar can be ignored: |
| 539 |
|
| 540 |
$mpv->cmd (set_property => "deinterlace", "yes"); |
| 541 |
|
| 542 |
Or it can be used to synchronously wait for the command results: |
| 543 |
|
| 544 |
$cv = $mpv->cmd (get_property => "video-format"); |
| 545 |
$format = $cv->recv; |
| 546 |
|
| 547 |
# or simpler: |
| 548 |
|
| 549 |
$format = $mpv->cmd (get_property => "video-format")->recv; |
| 550 |
|
| 551 |
# or even simpler: |
| 552 |
|
| 553 |
$format = $mpv->cmd_recv (get_property => "video-format"); |
| 554 |
|
| 555 |
Or you can set a callback: |
| 556 |
|
| 557 |
$cv = $mpv->cmd (get_property => "video-format"); |
| 558 |
$cv->cb (sub { |
| 559 |
my $format = $_[0]->recv; |
| 560 |
}); |
| 561 |
|
| 562 |
On error, the condvar will croak when C<recv> is called. |
| 563 |
|
| 564 |
=cut |
| 565 |
|
| 566 |
sub cmd { |
| 567 |
my ($self, @cmd) = @_; |
| 568 |
|
| 569 |
my $cv = AE::cv; |
| 570 |
|
| 571 |
my $reqid = ++$self->{reqid}; |
| 572 |
$self->{cmd_cv}{$reqid} = $cv; |
| 573 |
|
| 574 |
my $cmd = $JSON->new->utf8->encode ({ command => ref $cmd[0] ? $cmd[0] : \@cmd, request_id => $reqid*1 }); |
| 575 |
|
| 576 |
# (un-)apply escape_binary hack |
| 577 |
$cmd =~ s/\xf4\x8e\x97\x9f(..)/sprintf sprintf "\\x%02x", hex $1/ges; # f48e979f == 10e5df in utf-8 |
| 578 |
|
| 579 |
$self->{_send}($cmd); |
| 580 |
|
| 581 |
$cv |
| 582 |
} |
| 583 |
|
| 584 |
=item $result = $mpv->cmd_recv ($command => $arg, $arg...) |
| 585 |
|
| 586 |
The same as calling C<cmd> and immediately C<recv> on its return |
| 587 |
value. Useful when you don't want to mess with F<mpv> asynchronously or |
| 588 |
simply needs to have the result: |
| 589 |
|
| 590 |
$mpv->cmd_recv ("stop"); |
| 591 |
$position = $mpv->cmd_recv ("get_property", "playback-time"); |
| 592 |
|
| 593 |
=cut |
| 594 |
|
| 595 |
sub cmd_recv { |
| 596 |
&cmd->recv |
| 597 |
} |
| 598 |
|
| 599 |
=item $mpv->bind_key ($INPUT => $string) |
| 600 |
|
| 601 |
This is an extension implement by this module to make it easy to get key events. The way this is implemented |
| 602 |
is to bind a C<client-message> witha first argument of C<AnyEvent::MPV> and the C<$string> you passed. This C<$string> is then |
| 603 |
passed ot the C<on_key> handle when the key is proessed, e.g.: |
| 604 |
|
| 605 |
my $mpv = AnyEvent::MPV->new ( |
| 606 |
on_key => sub { |
| 607 |
my ($mpv, $key) = @_; |
| 608 |
|
| 609 |
if ($key eq "letmeout") { |
| 610 |
print "user pressed escape\n"; |
| 611 |
} |
| 612 |
}, |
| 613 |
); |
| 614 |
|
| 615 |
$mpv_>bind_key (ESC => "letmeout"); |
| 616 |
|
| 617 |
The key configuration is lost when F<mpv> is stopped and must be (re-)done |
| 618 |
after every C<start>. |
| 619 |
|
| 620 |
=cut |
| 621 |
|
| 622 |
sub bind_key { |
| 623 |
my ($self, $key, $event) = @_; |
| 624 |
|
| 625 |
$event =~ s/([^A-Za-z0-9\-_])/sprintf "\\x%02x", ord $1/ge; |
| 626 |
$self->cmd (keybind => $key => "no-osd script-message AnyEvent::MPV key $event"); |
| 627 |
} |
| 628 |
|
| 629 |
=back |
| 630 |
|
| 631 |
=head2 SUBCLASSING |
| 632 |
|
| 633 |
Like most perl objects, C<AnyEvent::MPV> objects are implemented as |
| 634 |
hashes, with the constructor simply storing all passed key-value pairs in |
| 635 |
the object. If you want to subclass to provide your own C<on_*> methods, |
| 636 |
be my guest and rummage around in the internals as much as you wish - the |
| 637 |
only guarantee that this module dcoes is that it will not use keys with |
| 638 |
double colons in the name, so youc an use those, or chose to simply not |
| 639 |
care and deal with the breakage. |
| 640 |
|
| 641 |
If you don't want to go to the effort of subclassing this module, you can |
| 642 |
also specify all event handlers as constructor keys. |
| 643 |
|
| 644 |
=head1 SEE ALSO |
| 645 |
|
| 646 |
L<AnyEvent>, L<the mpv command documentation|https://mpv.io/manual/stable/#command-interface>. |
| 647 |
|
| 648 |
=head1 AUTHOR |
| 649 |
|
| 650 |
Marc Lehmann <schmorp@schmorp.de> |
| 651 |
http://home.schmorp.de/ |
| 652 |
|
| 653 |
=cut |
| 654 |
|
| 655 |
1 |
| 656 |
|
