Merge branch 'fix-hls-seeking' of https://github.com/burrocargado/MPD into v0.23.x

NEWS

@@ -2,6 +2,7 @@ ver 0.23.7 (not yet released)
 * database
   - upnp: support pupnp 1.14
 * decoder
+  - ffmpeg: fix HLS seeking
   - opus: fix missing song length on high-latency files
 * output
   - shout: require at least libshout 2.4.0

src/decoder/plugins/FfmpegDecoderPlugin.cxx

@@ -471,7 +471,7 @@ static bool
 IsSeekable(const AVFormatContext &format_context) noexcept
 {
 #if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(58, 6, 100)
-	return (format_context.ctx_flags & AVFMTCTX_UNSEEKABLE) != 0;
+	return (format_context.ctx_flags & AVFMTCTX_UNSEEKABLE) == 0;
 #else
 	(void)format_context;
 	return false;
@@ -533,9 +533,8 @@ FfmpegDecode(DecoderClient &client, InputStream *input,
 		: FromFfmpegTimeChecked(format_context.duration, AV_TIME_BASE_Q);
 
 	client.Ready(audio_format,
-		     input
-		     ? input->IsSeekable()
-		     : IsSeekable(format_context),
+		     (input ? input->IsSeekable() : false)
+		     || IsSeekable(format_context),
 		     total_time);
 
 	FfmpegParseMetaData(client, format_context, audio_stream);