[FFmpeg-devel] [PATCH] avcodec/interplayacm: add a flush callback function (PR #21305)

[James Almer via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21305 opened by James Almer (jamrial)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21305
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21305.patch

Should prevent potential buffer overflows if passing new packets after seeking.


>From afeff1c72952f6f733d2839f3ebd4761c568c6d6 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Sun, 28 Dec 2025 12:55:59 -0300
Subject: [PATCH] avcodec/interplayacm: add a flush callback function

Should prevent potential buffer overflows if passing new packets after seeking.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/interplayacm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libavcodec/interplayacm.c b/libavcodec/interplayacm.c
index 2ae992a71d..2d940b903b 100644
--- a/libavcodec/interplayacm.c
+++ b/libavcodec/interplayacm.c
@@ -622,6 +622,14 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
     return n;
 }
 
+static void decode_flush(AVCodecContext *avctx)
+{
+    InterplayACMContext *s = avctx->priv_data;
+
+    s->bitstream_size = 0;
+    s->bitstream_index = 0;
+}
+
 static av_cold int decode_close(AVCodecContext *avctx)
 {
     InterplayACMContext *s = avctx->priv_data;
@@ -641,6 +649,7 @@ const FFCodec ff_interplay_acm_decoder = {
     .p.type         = AVMEDIA_TYPE_AUDIO,
     .p.id           = AV_CODEC_ID_INTERPLAY_ACM,
     .init           = decode_init,
+    .flush          = decode_flush,
     .close          = decode_close,
     FF_CODEC_DECODE_CB(decode_frame),
     .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
-- 
2.49.1

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