diff mbox series

[v4,10/11] media: Avoid parsing quantization and huffman tables

Message ID 20201102030821.3049-11-mirela.rabulea@oss.nxp.com (mailing list archive)
State New, archived
Headers show
Series Add V4L2 driver for i.MX8 JPEG Encoder/Decoder | expand

Commit Message

Mirela Rabulea OSS Nov. 2, 2020, 3:08 a.m. UTC 
From: Mirela Rabulea <mirela.rabulea@nxp.com>

These are optional in struct v4l2_jpeg_header, so do not parse if
not requested, save some time.

Signed-off-by: Mirela Rabulea <mirela.rabulea@nxp.com>
---
 drivers/media/v4l2-core/v4l2-jpeg.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-jpeg.c b/drivers/media/v4l2-core/v4l2-jpeg.c
index 244feccc4ea0..afce12822412 100644
--- a/drivers/media/v4l2-core/v4l2-jpeg.c
+++ b/drivers/media/v4l2-core/v4l2-jpeg.c
@@ -307,6 +307,9 @@  static int jpeg_parse_quantization_tables(struct jpeg_stream *stream,
 {
 	int len = jpeg_get_word_be(stream);
 
+	if (!tables)
+		return 0;
+
 	if (len < 0)
 		return len;
 	/* Lq = 2 + n * 65 (for baseline DCT), n >= 1 */
@@ -361,6 +364,9 @@  static int jpeg_parse_huffman_tables(struct jpeg_stream *stream,
 	int mt;
 	int len = jpeg_get_word_be(stream);
 
+	if (!tables)
+		return 0;
+
 	if (len < 0)
 		return len;
 	/* Table B.5 - Huffman table specification parameter sizes and values */