/******************************************************************************
    QtAV:  Multimedia framework based on Qt and FFmpeg
    Copyright (C) 2012-2015 Wang Bin <wbsecg1@gmail.com>

*   This file is part of QtAV

    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_AVDECODER_P_H
#define QTAV_AVDECODER_P_H

#include <QtCore/QHash>
#include <QtCore/QSharedPointer>
#include <QtCore/QVector>
#include "_fav_constants.h"
#include "AVCompat.h"

namespace FAV {

// always define the class to avoid macro check when using it
class AVFrameBuffers {
#if QTAV_HAVE(AVBUFREF)
    QVector<AVBufferRef*> buf;
#endif
public:
    AVFrameBuffers(AVFrame* frame) {
        Q_UNUSED(frame);
#if QTAV_HAVE(AVBUFREF)
        if (!frame->buf[0]) { //not ref counted. duplicate data?
            return;
        }

        buf.reserve(frame->nb_extended_buf + FF_ARRAY_ELEMS(frame->buf));
        buf.resize(frame->nb_extended_buf + FF_ARRAY_ELEMS(frame->buf));
        for (int i = 0; i < (int)FF_ARRAY_ELEMS(frame->buf); ++i) {
            if (!frame->buf[i]) //so not use planes + nb_extended_buf!
                continue;
            buf[i] = av_buffer_ref(frame->buf[i]);
            if (!buf[i]) {
                qWarning("av_buffer_ref(frame->buf[%d]) error", i);
            }
        }
        if (!frame->extended_buf)
            return;
        for (int i = 0; i < frame->nb_extended_buf; ++i) {
            const int k = buf.size() + i - frame->nb_extended_buf;
            buf[k] = av_buffer_ref(frame->extended_buf[i]);
            if (!buf[k]) {
                qWarning("av_buffer_ref(frame->extended_buf[%d]) error", i);
            }
        }
#endif //QTAV_HAVE(AVBUFREF)
    }
    ~AVFrameBuffers() {
#if QTAV_HAVE(AVBUFREF)
        foreach (AVBufferRef* b, buf) {
            av_buffer_unref(&b);
        }
#endif //QTAV_HAVE(AVBUFREF)
    }
};
typedef QSharedPointer<AVFrameBuffers> AVFrameBuffersRef;

class Q_AV_PRIVATE_EXPORT AVDecoderPrivate : public DPtrPrivate<AVDecoder>
{
public:
    static const char* getProfileName(AVCodecID id, int profile) {
        AVCodec *c = avcodec_find_decoder(id);
        if (!c)
            return "Unknow";
        return av_get_profile_name(c, profile);
    }
    static const char* getProfileName(const AVCodecContext* ctx) {
        if (ctx->codec)
            return av_get_profile_name(ctx->codec, ctx->profile);
        return getProfileName(ctx->codec_id, ctx->profile);
    }

    AVDecoderPrivate():
        codec_ctx(0)
      , available(true)
      , is_open(false)
      , undecoded_size(0)
      , dict(0)
    {
        codec_ctx = avcodec_alloc_context3(NULL);
    }
    virtual ~AVDecoderPrivate() {
        if (dict) {
            av_dict_free(&dict);
        }
        if (codec_ctx) {
            avcodec_free_context(&codec_ctx);
        }
    }
    virtual bool open() {return true;}
    virtual void close() {}
    virtual bool enableFrameRef() const { return true;}
    void applyOptionsForDict();
    void applyOptionsForContext();

    AVCodecContext *codec_ctx; //set once and not change
    bool available; //TODO: true only when context(and hw ctx) is ready
    bool is_open;
    int undecoded_size;
    QString codec_name;
    QVariantHash options;
    AVDictionary *dict;
};

class AudioResampler;
class AudioDecoderPrivate : public AVDecoderPrivate
{
public:
    AudioDecoderPrivate();
    virtual ~AudioDecoderPrivate();

    AudioResampler *resampler;
    QByteArray decoded;
};

class Q_AV_PRIVATE_EXPORT VideoDecoderPrivate : public AVDecoderPrivate
{
public:
    VideoDecoderPrivate():
        AVDecoderPrivate()
    {}
    virtual ~VideoDecoderPrivate() {}
};
} //namespace FAV

Q_DECLARE_METATYPE(FAV::AVFrameBuffersRef)

#endif // QTAV_AVDECODER_P_H