[x265] [PATCH] fix deadlock and output change on new ParallelFilter framework. (Issue #225)
chen
chenm003 at 163.com
Tue Jan 12 19:45:53 CET 2016
I fixed the crash and modify/remove FrameFilter::processPostCu, I spending ~64 bytes every row.
In my design, FrameFilter just one instance every frame and ParallelFilter instance for every row.
At 2016-01-12 13:37:36,"Deepthi Nandakumar" <deepthi at multicorewareinc.com> wrote:
Min, thanks. Queuing this.
I still think the ParallelFilter class needs a refactor - not nested, but inherited from FrameFilter. And FrameFilter contains all the constants for a single frame - numCols, numRows etc. This will also clean up FrameFilter::processPostCu (which is causing the crash in no-deblock, no-sao, since now you'll only refer to FrameFilter class members and not ParallelFilter (which is null if sao and deblock are disabled).
On Tue, Jan 12, 2016 at 2:36 AM, Min Chen <chenm003 at 163.com> wrote:
# HG changeset patch
# User Min Chen <chenm003 at 163.com>
# Date 1452545402 21600
# Node ID 1c273c83a4478ed39b0e6734eec1ba1cfccd07d6
# Parent 19cfada7162147f293e37302e4c7f9c1760928a0
fix deadlock and output change on new ParallelFilter framework. (Issue #225)
The bug from two part:
1. we old sync system allow latest column execute parallelism
2. new ParallelFilter logic will distribute threads and waitting the status change, there have a race conditions
---
source/encoder/frameencoder.cpp | 108 +++++++++++++++++++--------------------
1 files changed, 53 insertions(+), 55 deletions(-)
diff -r 19cfada71621 -r 1c273c83a447 source/encoder/frameencoder.cpp
--- a/source/encoder/frameencoder.cpp Mon Jan 11 16:28:39 2016 +0530
+++ b/source/encoder/frameencoder.cpp Mon Jan 11 14:50:02 2016 -0600
@@ -962,6 +962,58 @@
// Save CABAC state for next row
curRow.bufferedEntropy.loadContexts(rowCoder);
+ /* SAO parameter estimation using non-deblocked pixels for CTU bottom and right boundary areas */
+ if (m_param->bEnableSAO && m_param->bSaoNonDeblocked)
+ m_frameFilter.m_parallelFilter[row].m_sao.calcSaoStatsCu_BeforeDblk(m_frame, col, row);
+
+ /* Deblock with idle threading */
+ if (m_param->bEnableLoopFilter | m_param->bEnableSAO)
+ {
+ // TODO: Multiple Threading
+ // Delay ONE row to avoid Intra Prediction Conflict
+ if (m_pool && (row >= 1))
+ {
+ // Waitting last threading finish
+ m_frameFilter.m_parallelFilter[row - 1].waitForExit();
+
+ // Processing new group
+ int allowCol = col;
+
+ // avoid race condition on last column
+ if (row >= 2)
+ {
+ allowCol = X265_MIN(((col == numCols - 1) ? m_frameFilter.m_parallelFilter[row - 2].m_lastDeblocked.get()
+ : m_frameFilter.m_parallelFilter[row - 2].m_lastCol.get()), (int)col);
+ }
+ m_frameFilter.m_parallelFilter[row - 1].m_allowedCol.set(allowCol);
+ m_frameFilter.m_parallelFilter[row - 1].tryBondPeers(*this, 1);
+ }
+
+ // Last Row may start early
+ if (m_pool && (row == m_numRows - 1))
+ {
+ // Waiting for the last thread to finish
+ m_frameFilter.m_parallelFilter[row].waitForExit();
+
+ // Deblocking last row
+ int allowCol = col;
+
+ // avoid race condition on last column
+ if (row >= 2)
+ {
+ allowCol = X265_MIN(((col == numCols - 1) ? m_frameFilter.m_parallelFilter[row - 1].m_lastDeblocked.get()
+ : m_frameFilter.m_parallelFilter[row - 1].m_lastCol.get()), (int)col);
+ }
+ m_frameFilter.m_parallelFilter[row].m_allowedCol.set(allowCol);
+ m_frameFilter.m_parallelFilter[row].tryBondPeers(*this, 1);
+ }
+ }
+ // Both Loopfilter and SAO Disabled
+ else
+ {
+ m_frameFilter.processPostCu(row, col);
+ }
+
// Completed CU processing
curRow.completed++;
@@ -1091,60 +1143,6 @@
}
}
- // TODO: move Deblock and SAO to before VBV check
-
- /* SAO parameter estimation using non-deblocked pixels for CTU bottom and right boundary areas */
- if (m_param->bEnableSAO && m_param->bSaoNonDeblocked)
- m_frameFilter.m_parallelFilter[row].m_sao.calcSaoStatsCu_BeforeDblk(m_frame, col, row);
-
- /* Deblock with idle threading */
- if (m_param->bEnableLoopFilter | m_param->bEnableSAO)
- {
- // TODO: Multiple Threading
- // Delay ONE row to avoid Intra Prediction Conflict
- if (m_pool && (row >= 1))
- {
- // Waitting last threading finish
- m_frameFilter.m_parallelFilter[row - 1].waitForExit();
-
- // Processing new group
- int allowCol = col;
-
- // avoid race condition on last column
- if (row >= 2)
- {
- allowCol = X265_MIN(((col == numCols - 1) ? m_frameFilter.m_parallelFilter[row - 2].m_lastDeblocked.get()
- : m_frameFilter.m_parallelFilter[row - 2].m_lastCol.get()), (int)col);
- }
- m_frameFilter.m_parallelFilter[row - 1].m_allowedCol.set(allowCol);
- m_frameFilter.m_parallelFilter[row - 1].tryBondPeers(*this, 1);
- }
-
- // Last Row may start early
- if (m_pool && (row == m_numRows - 1))
- {
- // Waiting for the last thread to finish
- m_frameFilter.m_parallelFilter[row].waitForExit();
-
- // Deblocking last row
- int allowCol = col;
-
- // avoid race condition on last column
- if (row >= 2)
- {
- allowCol = X265_MIN(((col == numCols - 1) ? m_frameFilter.m_parallelFilter[row - 1].m_lastDeblocked.get()
- : m_frameFilter.m_parallelFilter[row - 1].m_lastCol.get()), (int)col);
- }
- m_frameFilter.m_parallelFilter[row].m_allowedCol.set(allowCol);
- m_frameFilter.m_parallelFilter[row].tryBondPeers(*this, 1);
- }
- }
- // Both Loopfilter and SAO Disabled
- else
- {
- m_frameFilter.processPostCu(row, col);
- }
-
if (m_param->bEnableWavefront && curRow.completed >= 2 && row < m_numRows - 1 &&
(!m_bAllRowsStop || intRow + 1 < m_vbvResetTriggerRow))
{
@@ -1161,7 +1159,7 @@
ScopedLock self(curRow.lock);
if ((m_bAllRowsStop && intRow > m_vbvResetTriggerRow) ||
- (row > 0 && curRow.completed < numCols - 1 && m_rows[row - 1].completed < m_rows[row].completed + 2))
+ (row > 0 && ((curRow.completed < numCols - 1) || (m_rows[row - 1].completed < numCols)) && m_rows[row - 1].completed < m_rows[row].completed + 2))
{
curRow.active = false;
curRow.busy = false;
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--
Deepthi Nandakumar
Engineering Manager, x265
Multicoreware, Inc
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