[x265] [PATCH] fix deadlock and output change on new ParallelFilter framework. (Issue #225)
Deepthi Nandakumar
deepthi at multicorewareinc.com
Tue Jan 12 06:37:36 CET 2016
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;
>
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
> https://mailman.videolan.org/listinfo/x265-devel
>
--
Deepthi Nandakumar
Engineering Manager, x265
Multicoreware, Inc
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