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jpegdepay: store quant tables in zigzag order
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1 changed files with 13 additions and 2 deletions
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@ -154,6 +154,17 @@ gst_rtp_jpeg_depay_finalize (GObject * object)
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G_OBJECT_CLASS (parent_class)->finalize (object);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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}
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static const int zigzag[] = {
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0, 1, 8, 16, 9, 2, 3, 10,
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17, 24, 32, 25, 18, 11, 4, 5,
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12, 19, 26, 33, 40, 48, 41, 34,
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27, 20, 13, 6, 7, 14, 21, 28,
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35, 42, 49, 56, 57, 50, 43, 36,
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29, 22, 15, 23, 30, 37, 44, 51,
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58, 59, 52, 45, 38, 31, 39, 46,
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53, 60, 61, 54, 47, 55, 62, 63
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};
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/*
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/*
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* Table K.1 from JPEG spec.
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* Table K.1 from JPEG spec.
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*/
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*/
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@ -198,8 +209,8 @@ MakeTables (GstRtpJPEGDepay * rtpjpegdepay, gint Q, guint8 qtable[128])
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Q = 200 - factor * 2;
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Q = 200 - factor * 2;
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for (i = 0; i < 64; i++) {
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for (i = 0; i < 64; i++) {
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gint lq = (jpeg_luma_quantizer[i] * Q + 50) / 100;
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gint lq = (jpeg_luma_quantizer[zigzag[i]] * Q + 50) / 100;
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gint cq = (jpeg_chroma_quantizer[i] * Q + 50) / 100;
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gint cq = (jpeg_chroma_quantizer[zigzag[i]] * Q + 50) / 100;
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/* Limit the quantizers to 1 <= q <= 255 */
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/* Limit the quantizers to 1 <= q <= 255 */
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qtable[i] = CLAMP (lq, 1, 255);
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qtable[i] = CLAMP (lq, 1, 255);
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