[FFmpeg-devel] [PATCH] avutil/opt: use AVBPrint to print a channel layout in av_opt_get()

[James Almer <jamrial@gmail.com>]

A 128 byte buffer may not be enough for some layouts with lots of channels.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavutil/opt.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/libavutil/opt.c b/libavutil/opt.c
index 0908751752..814b485a15 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -936,9 +936,15 @@ FF_DISABLE_DEPRECATION_WARNINGS
         break;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
-    case AV_OPT_TYPE_CHLAYOUT:
-        ret = av_channel_layout_describe(dst, buf, sizeof(buf));
-        break;
+    case AV_OPT_TYPE_CHLAYOUT: {
+        AVBPrint bp;
+        av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
+        av_channel_layout_describe_bprint(dst, &bp);
+        if (!av_bprint_is_complete(&bp))
+            return AVERROR(ENOMEM);
+        av_bprint_finalize(&bp, (char **)out_val);
+        return *out_val ? 0 : AVERROR(ENOMEM);
+    }
     case AV_OPT_TYPE_DICT:
         if (!*(AVDictionary **)dst && (search_flags & AV_OPT_ALLOW_NULL)) {
             *out_val = NULL;
-- 
2.43.0

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