Commit f675c507e2 for ffmpeg

commit f675c507e20ac78cd55f238ede52da470e6f6ec7
Author: lusoris <lusoris@proton.me>
Date:   Mon Oct 26 11:58:37 2026 +0100

    avcodec/adpcm: mark conditionally used frame locals as unused

    GCC 14.4.0 and 16.2.1 report -Wunused-variable and
    -Wunused-but-set-variable warnings in adpcm_decode_frame with
    single-decoder configurations such as adpcm_xa, adpcm_swf, adpcm_sanyo
    and adpcm_ima_citrix. Reads of shared locals disappear when their
    CASE blocks are disabled.

    Mark c, samples, samples_p and st as av_unused to suppress both
    warnings for any subset of enabled decoders without changing behavior.

    Signed-off-by: lusoris <lusoris@proton.me>

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index d3d796fe18..759a90aaf4 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1545,11 +1545,11 @@ static int adpcm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
-    ADPCMDecodeContext *c = avctx->priv_data;
+    av_unused ADPCMDecodeContext *c = avctx->priv_data;
     int channels = avctx->ch_layout.nb_channels;
-    int16_t *samples;
-    int16_t **samples_p;
-    int st; /* stereo */
+    av_unused int16_t *samples;
+    av_unused int16_t **samples_p;
+    av_unused int st; /* stereo */
     int nb_samples, coded_samples, approx_nb_samples, ret;
     GetByteContext gb;