forked from mirror/libbpg
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/*****************************************************************************
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* Copyright (C) 2013 x265 project
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*
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* Authors: Steve Borho <steve@borho.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at license @ x265.com
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*****************************************************************************/
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#ifndef X265_WAVEFRONT_H
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#define X265_WAVEFRONT_H
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#include "common.h"
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#include "threadpool.h"
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namespace X265_NS {
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// x265 private namespace
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// Generic wave-front scheduler, manages busy-state of CU rows as a priority
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// queue (higher CU rows have priority over lower rows)
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//
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// Derived classes must implement ProcessRow().
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class WaveFront : public JobProvider
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{
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private:
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// bitmaps of rows queued for processing, uses atomic intrinsics
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// Dependencies are categorized as internal and external. Internal dependencies
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// are caused by neighbor block availability. External dependencies are generally
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// reference frame reconstructed pixels being available.
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uint32_t volatile *m_internalDependencyBitmap;
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uint32_t volatile *m_externalDependencyBitmap;
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// number of words in the bitmap
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int m_numWords;
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int m_numRows;
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public:
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WaveFront()
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: m_internalDependencyBitmap(NULL)
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, m_externalDependencyBitmap(NULL)
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{}
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virtual ~WaveFront();
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// If returns false, the frame must be encoded in series.
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bool init(int numRows);
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// Enqueue a row to be processed (mark its internal dependencies as resolved).
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// A worker thread will later call processRow(row).
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// This provider must be enqueued in the pool before enqueuing a row
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void enqueueRow(int row);
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// Mark a row as no longer having internal dependencies resolved. Returns
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// true if bit clear was successful, false otherwise.
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bool dequeueRow(int row);
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// Mark the row's external dependencies as being resolved
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void enableRow(int row);
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// Mark all row external dependencies as being resolved. Some wavefront
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// implementations (lookahead, for instance) have no recon pixel dependencies.
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void enableAllRows();
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// Mark all rows as having external dependencies which must be
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// resolved before each row may proceed.
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void clearEnabledRowMask();
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// WaveFront's implementation of JobProvider::findJob. Consults
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// m_queuedBitmap and calls ProcessRow(row) for lowest numbered queued row
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// processes available rows and returns when no work remains
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void findJob(int threadId);
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// Start or resume encode processing of this row, must be implemented by
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// derived classes.
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virtual void processRow(int row, int threadId) = 0;
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};
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} // end namespace X265_NS
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#endif // ifndef X265_WAVEFRONT_H
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