[FFmpeg-devel] [PATCH v2] avcodec/mediacodecdec: call MediaCodec.stop on close

[sfan5 <sfan5@live.de>]

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revised commit message as suggested

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From 9aa111c400cc3245edf870c431a5e271432ef5f2 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Wed, 7 Aug 2024 17:48:06 +0200
Subject: [PATCH v2] avcodec/mediacodecdec: call MediaCodec.stop on close

Usually the MediaCodec context will be released immediately, or it needs to stay
alive due to existing hardware buffers.

However we can free resources early in the case of
hw_buffer_count == 0 && refcount > 1, which can be reproduced by keeping frames
referenced after flushing and closing. mpv currently behaves like this.

Signed-off-by: sfan5 <sfan5@live.de>
---
 libavcodec/mediacodecdec_common.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libavcodec/mediacodecdec_common.c b/libavcodec/mediacodecdec_common.c
index d6f91e6e89..c888dea8cf 100644
--- a/libavcodec/mediacodecdec_common.c
+++ b/libavcodec/mediacodecdec_common.c
@@ -841,6 +841,18 @@ int ff_mediacodec_dec_flush(AVCodecContext *avctx, MediaCodecDecContext *s)
 
 int ff_mediacodec_dec_close(AVCodecContext *avctx, MediaCodecDecContext *s)
 {
+    if (!s)
+        return 0;
+
+    if (s->codec) {
+        if (atomic_load(&s->hw_buffer_count) == 0) {
+            ff_AMediaCodec_stop(s->codec);
+            av_log(avctx, AV_LOG_DEBUG, "MediaCodec %p stopped\n", s->codec);
+        } else {
+            av_log(avctx, AV_LOG_DEBUG, "Not stopping MediaCodec (there are buffers pending)\n");
+        }
+    }
+
     ff_mediacodec_dec_unref(s);
 
     return 0;
-- 
2.46.0


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