#!/usr/bin/perl

use Shell;
use strict;
use POSIX qw(floor);

# Written by Bob Igo from the MythTV Store at http://MythiC.TV
# including some original code and contributions from Nick C.
# and graysky.
# Email: bob@stormlogic.com
#
# If you run into problems with this script, please send me email

# PURPOSE:
# --------------------------
# This is a wrapper script that tries to find the best parameters
# for calling an underlying video player.  The outer layer determines
# the best playback parameters, while the inner layer picks the best
# player to call.

# RATIONALE:
# --------------------------
# Default video playback options are not optimal on all hardware or
# for all video types.  In addition, common video players do not
# offer to bookmark video so that you can resume where you left off.
# Both of these problems can be addressed by this wrapper.

# PARAMETERS:
# --------------------------
# The same parameters you'd use for mplayer, some of which may be
# translated automatically for use with smplayer.

# FILES:
# --------------------------
# $mediafile, the file to play

sub run () {
    my $mediafile = @ARGV[$#ARGV];
    my $player = &pick_player();

    my $player_parameters = join(' ',
				 &translate_parameters($player,@ARGV[0..$#ARGV-1]),
				 &dynamic_parameters($mediafile));
    &player($player,$player_parameters,$mediafile);
}

&run();

# Translates any parameters into ones that will be compatible with the given player.
sub translate_parameters() {
    my($player,@parameters)=@_;

    if ($player eq "smplayer") {
	# Stupidly, smplayer uses a different set of command-line parameters than generic
	# mplayer, so we need to translate mplayer-centric ones into the few that are
	# available in smplayer-ese.
	my %smplayer_parameter_translation_array = (
	    "-fs" => "-fullscreen",
	    "-zoom" => " "
	    );
	
	sub translate() {
	    my($flag)=@_;
	    return $smplayer_parameter_translation_array{$flag};
	}
	
	return map(&translate($_), @parameters);
    } else {
	return @parameters;
    }
}

# Returns an array of dynamic parameters based in part on the media.
sub dynamic_parameters () {
    my($mediafile)=@_;
    return(); # ??? empty for now; further development required
}

# Find the best player for use on this system.  The script prefers smplayer,
# which has built-in bookmarking, falling back to mplayer-resumer.pl, which
# implements bookmarking as an mplayer wrapper, if smplayer cannot be found.
# Finally, if no bookmarking players can be found, a barebones mplayer is used.
sub pick_player () {
    my @possible_players = ("smplayer", "mplayer-resumer.pl", "mplayer");
    my $command;
    my $candidate_player;
    foreach (@possible_players) {
	$candidate_player = $_;
	$command = "which $candidate_player |";
	open(SHELL, $command);
	if (<SHELL>) {
	    #print "player $candidate_player : $_\n";
	    return $candidate_player;
	}
	close(SHELL);
    }
}

# Calls player
sub player () {
    my($player,$parameters,$mediafile)=@_;
    my $command = "$player $parameters \"$mediafile\" 2>&1 2>/dev/null |";

    #print "DEBUG: command is:\n$command\n";
    open(SHELL, $command);
    while (<SHELL>) {
	print $_;
    }
    close(SHELL);
}