ros256

Yeah, looks like that is true… I didn’t modify the code that uses the flash plugin, but since you asked… I added a check for the autoplay parameter and referenced the result when generating the code for flash in Firefox and Opera. Try this :

wp_embed_register_handler( 'html5_audio', '#^https://.+\.(mp3|ogg|wav)$#i', 'wp_embed_handler_html5_audio' );

function wp_embed_handler_html5_audio( $matches, $attr, $url, $rawattr ) {
	$flash_player = plugins_url('3523697345-audio-player.swf', __FILE__);

	if ($attr{autoplay}=='autoplay') {
		$autoplay='true';
	} else {
		$autoplay='false';
	}

	if (preg_match('#^https://.+\.mp3$#i', $url) && preg_match('/Firefox/', $_SERVER["HTTP_USER_AGENT"])) {
		// For religious reasons Firefox does not support MP3 format in HTML5 audio tag, use Flash player instead
		$embed = sprintf(
				'<embed type="application/x-shockwave-flash" flashvars="audioUrl=%1$s&autoPlay='.$autoplay.'" src="'.$flash_player.'" width="400" height="27" quality="best"></embed>',
				esc_attr($matches[0])
				);
	} else if (preg_match('#^https://.+\.mp3$#i', $url) && preg_match('/Opera/', $_SERVER["HTTP_USER_AGENT"])) {
		// Opera also does not support MP3 format in HTML5 audio tag, use Flash player instead
		$embed = sprintf(
				'<embed type="application/x-shockwave-flash" flashvars="audioUrl=%1$s&autoPlay='.$autoplay.'" src="'.$flash_player.'" width="400" height="27" quality="best"></embed>',
				esc_attr($matches[0])
				);
	} else if (preg_match('#^https://.+\.ogg$#i', $url) && preg_match('/MSIE/', $_SERVER["HTTP_USER_AGENT"])) {
		$embed = '[Internet Explorer does not support OGG format]';
	} else if (preg_match('#^https://.+\.wav$#i', $url) && preg_match('/MSIE/', $_SERVER["HTTP_USER_AGENT"])) {
		$embed = '[Internet Explorer does not support WAV format]';
	} else {
		$embed = sprintf(
				'<audio controls preload '.$attr{autoplay}.'><source src="%1$s" /><embed type="application/x-shockwave-flash" flashvars="audioUrl=%1$s" src="'.$flash_player.'" width="400" height="27" quality="best"></embed></audio>',
				esc_attr($matches[0])
				);
	}

	$embed = apply_filters( 'oembed_html5_audio', $embed, $matches, $attr, $url, $rawattr );
	return apply_filters( 'oembed_result', $embed, $url, '' );
}