decoder/ffmpeg: fix build problem with FFmpeg 3.4

Regression by commit a22d1c88 Closes https://github.com/MusicPlayerDaemon/MPD/issues/1097

decoder/ffmpeg: fix build problem with FFmpeg 3.4
6eba6210 · Max Kellermann · a9ad8fa5 · 6eba6210 · 6eba6210
Commit 6eba6210 authored Feb 22, 2021 by Max Kellermann
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NEWS NEWS +2 -0

FfmpegDecoderPlugin.cxx src/decoder/plugins/FfmpegDecoderPlugin.cxx +4 -0

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--- a/NEWS
+++ b/NEWS
 ver 0.22.7 (not yet released)
+* decoder
+  - ffmpeg: fix build problem with FFmpeg 3.4

 ver 0.22.6 (2021/02/16)
 * fix missing tags on songs in queue

--- a/src/decoder/plugins/FfmpegDecoderPlugin.cxx
+++ b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
@@ -467,7 +467,11 @@ FfmpegCheckTag(DecoderClient &client, InputStream *is,
 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;
+#else
+	return false;
+#endif
 }

 static void