diff options
author | Wim Taymans <wim.taymans@collabora.co.uk> | 2012-10-17 14:23:01 +0200 |
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committer | Wim Taymans <wim.taymans@collabora.co.uk> | 2012-10-17 14:23:01 +0200 |
commit | e9040e90a59c4f540a03e10566e8c227a8f6d93f (patch) | |
tree | 247442838667d4572f949a4be132e78d31843b50 | |
parent | d5fd524a0c831836d2fe66fa482dede0591d0c47 (diff) |
jpegdepay: store quant tables in zigzag order
-rw-r--r-- | gst/rtp/gstrtpjpegdepay.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/gst/rtp/gstrtpjpegdepay.c b/gst/rtp/gstrtpjpegdepay.c index 0ea3303a5..693df8230 100644 --- a/gst/rtp/gstrtpjpegdepay.c +++ b/gst/rtp/gstrtpjpegdepay.c @@ -154,6 +154,17 @@ gst_rtp_jpeg_depay_finalize (GObject * object) G_OBJECT_CLASS (parent_class)->finalize (object); } +static const int zigzag[] = { + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63 +}; + /* * Table K.1 from JPEG spec. */ @@ -198,8 +209,8 @@ MakeTables (GstRtpJPEGDepay * rtpjpegdepay, gint Q, guint8 qtable[128]) Q = 200 - factor * 2; for (i = 0; i < 64; i++) { - gint lq = (jpeg_luma_quantizer[i] * Q + 50) / 100; - gint cq = (jpeg_chroma_quantizer[i] * Q + 50) / 100; + gint lq = (jpeg_luma_quantizer[zigzag[i]] * Q + 50) / 100; + gint cq = (jpeg_chroma_quantizer[zigzag[i]] * Q + 50) / 100; /* Limit the quantizers to 1 <= q <= 255 */ qtable[i] = CLAMP (lq, 1, 255); |