[FFmpeg-cvslog] avcodec/qpeg: speed-up copy of bytes

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Mon Aug 31 23:25:22 2020 +0200| [97c73ba56505e180f6ab8f49b7b5642e0c09fa09] | committer: Paul B Mahol

avcodec/qpeg: speed-up copy of bytes

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=97c73ba56505e180f6ab8f49b7b5642e0c09fa09
---

 libavcodec/qpeg.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavcodec/qpeg.c b/libavcodec/qpeg.c
index 40931e3bdc..8bc710acfd 100644
--- a/libavcodec/qpeg.c
+++ b/libavcodec/qpeg.c
@@ -101,8 +101,11 @@ static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
         } else {
             if (bytestream2_get_bytes_left(&qctx->buffer) < copy)
                 copy = bytestream2_get_bytes_left(&qctx->buffer);
-            for(i = 0; i < copy; i++) {
-                dst[filled++] = bytestream2_get_byte(&qctx->buffer);
+            while (copy > 0) {
+                int step = FFMIN(copy, width - filled);
+                bytestream2_get_bufferu(&qctx->buffer, dst + filled, step);
+                filled += step;
+                copy -= step;
                 if (filled >= width) {
                     filled = 0;
                     dst -= stride;