avcodec/cbs_jpeg: Use memcpy when writing pictures

This is possible because the size of a scan header is always a multiple
of a byte.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/libavcodec/cbs_jpeg.c b/libavcodec/cbs_jpeg.c
index b52e5c5823..6bbce5f89b 100644
--- a/libavcodec/cbs_jpeg.c
+++ b/libavcodec/cbs_jpeg.c
@@ -327,7 +327,7 @@ static int cbs_jpeg_write_scan(CodedBitstreamContext *ctx,
                                PutBitContext *pbc)
 {
     JPEGRawScan *scan = unit->content;
-    int i, err;
+    int err;
 
     err = cbs_jpeg_write_scan_header(ctx, pbc, &scan->header);
     if (err < 0)
@@ -337,8 +337,12 @@ static int cbs_jpeg_write_scan(CodedBitstreamContext *ctx,
         if (scan->data_size * 8 > put_bits_left(pbc))
             return AVERROR(ENOSPC);
 
-        for (i = 0; i < scan->data_size; i++)
-            put_bits(pbc, 8, scan->data[i]);
+        av_assert0(put_bits_count(pbc) % 8 == 0);
+
+        flush_put_bits(pbc);
+
+        memcpy(put_bits_ptr(pbc), scan->data, scan->data_size);
+        skip_put_bytes(pbc, scan->data_size);
     }
 
     return 0;