From 8f7adf79a3932b20a1cc9750648d6d12c4941a20 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 7 Jan 2013 23:06:02 +0100
Subject: decoder/Opus: read total time

---
 src/decoder/OpusDecoderPlugin.cxx | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'src/decoder/OpusDecoderPlugin.cxx')

diff --git a/src/decoder/OpusDecoderPlugin.cxx b/src/decoder/OpusDecoderPlugin.cxx
index c4d6c2d12..9c2f86d05 100644
--- a/src/decoder/OpusDecoderPlugin.cxx
+++ b/src/decoder/OpusDecoderPlugin.cxx
@@ -22,6 +22,7 @@
 #include "OpusHead.hxx"
 #include "OpusTags.hxx"
 #include "OggUtil.hxx"
+#include "OggFind.hxx"
 #include "decoder_api.h"
 #include "OggCodec.hxx"
 #include "audio_check.h"
@@ -290,6 +291,23 @@ mpd_opus_stream_decode(struct decoder *decoder,
 	ogg_sync_clear(&oy);
 }
 
+static bool
+SeekFindEOS(ogg_sync_state &oy, ogg_stream_state &os, ogg_packet &packet,
+	    decoder *decoder, input_stream *is)
+{
+	if (is->size > 0 && is->size - is->offset < 65536)
+		return OggFindEOS(oy, os, packet, decoder, is);
+
+	if (!input_stream_cheap_seeking(is))
+		return false;
+
+	ogg_sync_reset(&oy);
+
+	return input_stream_lock_seek(is, -65536, SEEK_END, nullptr) &&
+		OggExpectPageSeekIn(oy, os, decoder, is) &&
+		OggFindEOS(oy, os, packet, decoder, is);
+}
+
 static bool
 mpd_opus_scan_stream(struct input_stream *is,
 		     const struct tag_handler *handler, void *handler_ctx)
@@ -351,6 +369,10 @@ mpd_opus_scan_stream(struct input_stream *is,
 		}
 	}
 
+	if (packet.e_o_s || SeekFindEOS(oy, os, packet, nullptr, is))
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    packet.granulepos / opus_sample_rate);
+
 	ogg_stream_clear(&os);
 	ogg_sync_clear(&oy);
 
-- 
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