[FFmpeg-cvslog] vulkan/common: Fix off-by-one error in flush_put_bits

[IndecisiveTurtle]

ffmpeg | branch: master | IndecisiveTurtle <geoster3d at gmail.com> | Wed Nov 27 21:18:05 2024 +0200| [f794ed48c09cfb31611cb4fe4bf7df32339f12eb] | committer: Lynne

vulkan/common: Fix off-by-one error in flush_put_bits

If caller wrote a divisible by eight number of bits it would write an extra byte.
Also increment by to_write instead of BUF_BYTES which overly pads the bitstream.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f794ed48c09cfb31611cb4fe4bf7df32339f12eb
---

 libavcodec/vulkan/common.comp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vulkan/common.comp b/libavcodec/vulkan/common.comp
index a28701584e..17c18934e6 100644
--- a/libavcodec/vulkan/common.comp
+++ b/libavcodec/vulkan/common.comp
@@ -141,12 +141,12 @@ uint32_t flush_put_bits(inout PutBitContext pb)
         pb.bit_buf <<= pb.bit_left;
 
     if (pb.bit_left < BUF_BITS) {
-        uint to_write = ((BUF_BITS - pb.bit_left) >> 3) + 1;
+        uint to_write = ((BUF_BITS - pb.bit_left - 1) >> 3) + 1;
 
         u8buf bs = u8buf(pb.buf);
         for (int i = 0; i < to_write; i++)
             bs[i].v = BYTE_EXTRACT(pb.bit_buf, BUF_BYTES - uint8_t(1) - i);
-        pb.buf = uint64_t(bs) + BUF_BYTES;
+        pb.buf = uint64_t(bs) + to_write;
     }
 
     pb.bit_left = BUF_BITS;