shithub: dav1d

Info  •  Files  •  Log  •  Branches

If Y/AC is 0 (but lossless=0), only allow coding DCT_DCT

This is consistent with what libaom does. Should fix #175.

--- a/src/env.h

+++ b/src/env.h

@@ -127,9 +127,13 @@

                                                 const Av1FrameHeader *const hdr,

                                                 const int seg_id)

 {

-    if (hdr->segmentation.lossless[seg_id]) {

-        assert(tx == (int) TX_4X4);

-        return TXTP_SET_LOSSLESS;

+    if (!hdr->segmentation.qidx[seg_id]) {

+        if (hdr->segmentation.lossless[seg_id]) {

+            assert(tx == (int) TX_4X4);

+            return TXTP_SET_LOSSLESS;

+        } else {

+            return TXTP_SET_DCT;

+        }

     }

     const TxfmInfo *const t_dim = &dav1d_txfm_dimensions[tx];