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2026-02-21 17:11:31 +09:00
commit 18b4338361
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--- a/project/fm_viewer/fav/PacketBuffer.h
+++ b/project/fm_viewer/fav/PacketBuffer.h
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+/******************************************************************************
+    QtAV:  Multimedia framework based on Qt and FFmpeg
+    Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>
+
+*   This file is part of QtAV (from 2015)
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+******************************************************************************/
+
+#ifndef QTAV_PACKETBUFFER_H
+#define QTAV_PACKETBUFFER_H
+
+#include <QtCore/QQueue>
+#include "Packet.h"
+#include "BlockingQueue.h"
+#include "ring.h"
+
+namespace FAV {
+
+/*
+ * take empty: start buffering, block at next take if still empty
+ * take enough: start to put more packets
+ * put enough: end buffering, end take block
+ * put full: stop putting more packets
+ */
+class PacketBuffer : public BlockingQueue<Packet, QQueue>
+{
+public:
+    PacketBuffer();
+    ~PacketBuffer();
+
+    void setBufferMode(BufferMode mode);
+    BufferMode bufferMode() const;
+    /*!
+     * \brief setBufferValue
+     * Ensure the buffered msecs/bytes/packets in queue is at least the given value
+     * \param value BufferBytes: bytes, BufferTime: msecs, BufferPackets: packets count
+     */
+    void setBufferValue(qint64 value);
+    qint64 bufferValue() const;
+    /*!
+     * \brief setBufferMax
+     * stop buffering if max value reached. Real value is bufferValue()*bufferMax()
+     * \param max the ratio to bufferValue(). always >= 1.0
+     */
+    void setBufferMax(qreal max);
+    qreal bufferMax() const;
+    /*!
+     * \brief buffered
+     * Current buffered value in the queue
+     */
+    qint64 buffered() const;
+    bool isBuffering() const;
+    /*!
+     * \brief bufferProgress
+     * How much of the data buffer is currently filled, from 0.0 (empty) to 1.0 (enough or full).
+     * bufferProgress() can be less than 1 if not isBuffering();
+     * \return Percent of buffered time, bytes or packets.
+     */
+    qreal bufferProgress() const;
+    /*!
+     * \brief bufferSpeed
+     * Depending on BufferMode, the result is delta_pts/s, packets/s or bytes/s
+     * \return
+     */
+    qreal bufferSpeed() const;
+    qreal bufferSpeedInBytes() const;
+
+
+
+protected:
+    bool checkEnough() const Q_DECL_OVERRIDE;
+    bool checkFull() const Q_DECL_OVERRIDE;
+    void onTake(const Packet &) Q_DECL_OVERRIDE;
+    void onPut(const Packet &) Q_DECL_OVERRIDE;
+protected:
+    typedef BlockingQueue<Packet, QQueue> PQ;
+    using PQ::setCapacity;
+    using PQ::setThreshold;
+    using PQ::capacity;
+    using PQ::threshold;
+
+
+private:
+    qreal calc_speed(bool use_bytes) const;
+
+    BufferMode m_mode;
+    bool m_buffering;
+    qreal m_max;
+    // bytes or count
+    qint64 m_buffer;
+    qint64 m_value0, m_value1;
+    typedef struct {
+        qint64 v; //pts, total packes or total bytes
+        qint64 bytes; //total bytes
+        qint64 t;
+    } BufferInfo;
+    ring<BufferInfo> m_history;
+};
+
+} //namespace FAV
+#endif // QTAV_PACKETBUFFER_H