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Remove secondary mv clamping from decode stage

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This patch removes the secondary MV clamping from the MV decoder. This
behavior was consistent with limits placed on non-split MVs by the
reference encoder, but was inconsistent with the MVs generated in the
split case.

The purpose of this secondary clamping was only to prevent crashes on
invalid data. It was not intended to be a behaviour an encoder could or
should rely on. Instead of doing additional clamping in a way that
changes the entropy context, the secondary clamp is removed and the
border handling is made implmentation specific. With respect to the
spec, the border is treated as essentially infinite, limited only by
the clamping performed on the near/nearest reference and the maximum
encodable magnitude of the residual MV.

This does not affect any currently produced streams.

Change-Id: I68d35a2fbb51570d6569eab4ad233961405230a3
This commit is contained in:
John Koleszar
2010-06-09 11:29:20 -04:00
parent 4bb895e854
commit 3085025fa1
4 changed files with 117 additions and 39 deletions
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8
vp8/decoder/threading.c
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@@ -1,10 +1,10 @@
/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
@@ -154,7 +154,9 @@ THREAD_FUNCTION vp8_thread_decoding_proc(void *p_data)
}
// Take a copy of the mode and Mv information for this macroblock into the xd->mbmi
vpx_memcpy(&xd->mbmi, &xd->mode_info_context->mbmi, 32); //sizeof(MB_MODE_INFO) );
// the partition_bmi array is unused in the decoder, so don't copy it.
vpx_memcpy(&xd->mbmi, &xd->mode_info_context->mbmi,
sizeof(MB_MODE_INFO) - sizeof(xd->mbmi.partition_bmi));
if (xd->mbmi.mode == SPLITMV || xd->mbmi.mode == B_PRED)
{