File 0001-opusenc-psy-disable-stereo-searches.patch of Package A_tw-ffmpeg-3

File 0001-opusenc-psy-disable-stereo-searches.patch of Package A_tw-ffmpeg-3 (Revision 393469f8033bfe0547704b7a7010f557)

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From f141b353e60f1081185927a1e74a9ab46cae8bef Mon Sep 17 00:00:00 2001
From: Rostislav Pehlivanov <atomnuker@gmail.com>
Date: Thu, 4 Jan 2018 02:52:40 +0000
Subject: [PATCH] opusenc_psy: disable stereo searches for mono streams

Fixes a crash which happened when someone tried to encode mono.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
---
 libavcodec/opusenc_psy.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libavcodec/opusenc_psy.c b/libavcodec/opusenc_psy.c
index 50890c65d6..b712603344 100644
--- a/libavcodec/opusenc_psy.c
+++ b/libavcodec/opusenc_psy.c
@@ -383,6 +383,10 @@ static void celt_search_for_dual_stereo(OpusPsyContext *s, CeltFrame *f)
 {
     float td1, td2;
     f->dual_stereo = 0;
+
+    if (s->avctx->channels < 2)
+        return;
+
     bands_dist(s, f, &td1);
     f->dual_stereo = 1;
     bands_dist(s, f, &td2);
@@ -396,6 +400,9 @@ static void celt_search_for_intensity(OpusPsyContext *s, CeltFrame *f)
     int i, best_band = CELT_MAX_BANDS - 1;
     float dist, best_dist = FLT_MAX;
 
+    if (s->avctx->channels < 2)
+        return;
+
     /* TODO: fix, make some heuristic up here using the lambda value */
     float end_band = 0;
 
-- 
2.11.0