From 2b4273072dbb1dde2ab4bbbd30b3cef4042fc4fb Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sat, 11 Feb 2023 22:56:10 +0100
Subject: [PATCH] avcodec/roqaudioenc: unbreak mono encoding

---
 libavcodec/roqaudioenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/roqaudioenc.c b/libavcodec/roqaudioenc.c
index f0254adc70..81dccd09b5 100644
--- a/libavcodec/roqaudioenc.c
+++ b/libavcodec/roqaudioenc.c
@@ -174,7 +174,7 @@ static int roq_dpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 
     /* Write the actual samples */
     for (i = 0; i < data_size; i++)
-        *out++ = dpcm_predict(&context->lastSample[i & 1], *in++);
+        *out++ = dpcm_predict(&context->lastSample[(i & 1) & stereo], *in++);
 
     avpkt->pts      = context->input_frames <= 7 ? context->first_pts : frame->pts;
     avpkt->duration = data_size / channels;