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From: Lynne <dev@lynne.ee>
To: ffmpeg-devel@ffmpeg.org
Date: Sat, 12 Apr 2025 09:22:47 +0200
Message-ID: <20250412072256.77815-16-dev@lynne.ee>
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Subject: [FFmpeg-devel] [PATCH 16/18] vulkan_ffv1: shortcut +-1 coeffs in
symbol reading
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Slightly faster, and allows for further optimizations.
---
libavcodec/vulkan/ffv1_dec.comp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libavcodec/vulkan/ffv1_dec.comp b/libavcodec/vulkan/ffv1_dec.comp
index 4cc3b9987f..fd9b98023c 100644
--- a/libavcodec/vulkan/ffv1_dec.comp
+++ b/libavcodec/vulkan/ffv1_dec.comp
@@ -119,7 +119,10 @@ int get_isymbol(inout RangeCoder c, uint64_t state)
for (e = 0; e < 32; e++)
if (!get_rac(c, state + min(e, 9)))
break;
- if (e > 31) {
+
+ if (e == 0) {
+ return get_rac(c, state + 10) ? -1 : 1;
+ } else if (e > 31) {
corrupt = true;
return 0;
}
--
2.47.2
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