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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QFFMPEG_P_H
#define QFFMPEG_P_H
#include <private/qtmultimediaglobal_p.h>
#include <qstring.h>
#include <optional>
extern "C" {
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswresample/swresample.h>
#include <libavutil/avutil.h>
#include <libswscale/swscale.h>
}
#define QT_FFMPEG_OLD_CHANNEL_LAYOUT (LIBAVCODEC_VERSION_INT < AV_VERSION_INT(59,24,100))
#define QT_FFMPEG_HAS_VULKAN \
(LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(58, 91, 100)) // since ffmpeg n4.3
#define QT_FFMPEG_HAS_FRAME_TIME_BASE \
(LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(59, 18, 100)) // since ffmpeg n5.0
#define QT_FFMPEG_HAS_FRAME_DURATION \
(LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(60, 3, 100)) // since ffmpeg n6.0
QT_BEGIN_NAMESPACE
namespace QFFmpeg
{
inline std::optional<qint64> mul(qint64 a, AVRational b)
{
return b.den != 0 ? (a * b.num + b.den / 2) / b.den : std::optional<qint64>{};
}
inline std::optional<qreal> mul(qreal a, AVRational b)
{
return b.den != 0 ? a * qreal(b.num) / qreal(b.den) : std::optional<qreal>{};
}
inline std::optional<qint64> timeStampMs(qint64 ts, AVRational base)
{
return mul(1'000 * ts, base);
}
inline std::optional<qint64> timeStampUs(qint64 ts, AVRational base)
{
return mul(1'000'000 * ts, base);
}
inline std::optional<float> toFloat(AVRational r)
{
return r.den != 0 ? float(r.num) / float(r.den) : std::optional<float>{};
}
inline QString err2str(int errnum)
{
char buffer[AV_ERROR_MAX_STRING_SIZE + 1] = {};
av_make_error_string(buffer, AV_ERROR_MAX_STRING_SIZE, errnum);
return QString::fromLocal8Bit(buffer);
}
inline void setAVFrameTime(AVFrame &frame, int64_t pts, const AVRational &timeBase)
{
frame.pts = pts;
#if QT_FFMPEG_HAS_FRAME_TIME_BASE
frame.time_base = timeBase;
#else
Q_UNUSED(timeBase);
#endif
}
inline void getAVFrameTime(const AVFrame &frame, int64_t &pts, AVRational &timeBase)
{
pts = frame.pts;
#if QT_FFMPEG_HAS_FRAME_TIME_BASE
timeBase = frame.time_base;
#else
timeBase = { 0, 1 };
#endif
}
inline int64_t getAVFrameDuration(const AVFrame &frame)
{
#if QT_FFMPEG_HAS_FRAME_DURATION
return frame.duration;
#else
return 0;
#endif
}
struct AVDictionaryHolder
{
AVDictionary *opts = nullptr;
operator AVDictionary **() { return &opts; }
~AVDictionaryHolder()
{
if (opts)
av_dict_free(&opts);
}
};
template<typename FunctionType, FunctionType F>
struct AVDeleter
{
template<typename T>
void operator()(T *object) const
{
if (object)
F(&object);
}
};
using AVFrameUPtr = std::unique_ptr<AVFrame, AVDeleter<decltype(&av_frame_free), &av_frame_free>>;
inline AVFrameUPtr makeAVFrame()
{
return AVFrameUPtr(av_frame_alloc());
}
using AVPacketUPtr =
std::unique_ptr<AVPacket, AVDeleter<decltype(&av_packet_free), &av_packet_free>>;
using AVCodecContextUPtr =
std::unique_ptr<AVCodecContext,
AVDeleter<decltype(&avcodec_free_context), &avcodec_free_context>>;
using AVBufferUPtr =
std::unique_ptr<AVBufferRef, AVDeleter<decltype(&av_buffer_unref), &av_buffer_unref>>;
using AVHWFramesConstraintsUPtr = std::unique_ptr<
AVHWFramesConstraints,
AVDeleter<decltype(&av_hwframe_constraints_free), &av_hwframe_constraints_free>>;
using PixelOrSampleFormat = int;
using AVScore = int;
constexpr AVScore BestAVScore = std::numeric_limits<AVScore>::max();
constexpr AVScore DefaultAVScore = 0;
constexpr AVScore NotSuitableAVScore = std::numeric_limits<AVScore>::min();
constexpr AVScore MinAVScore = NotSuitableAVScore + 1;
const AVCodec *findAVDecoder(AVCodecID codecId,
const std::optional<AVHWDeviceType> &deviceType = {},
const std::optional<PixelOrSampleFormat> &format = {});
const AVCodec *findAVEncoder(AVCodecID codecId,
const std::optional<AVHWDeviceType> &deviceType = {},
const std::optional<PixelOrSampleFormat> &format = {});
const AVCodec *findAVEncoder(AVCodecID codecId,
const std::function<AVScore(const AVCodec *)> &scoresGetter);
bool isAVFormatSupported(const AVCodec *codec, PixelOrSampleFormat format);
template<typename Format>
bool hasAVFormat(const Format *fmts, Format format)
{
return findAVFormat(fmts, [format](Format f) { return f == format; }) != Format(-1);
}
template<typename Format, typename Predicate>
Format findAVFormat(const Format *fmts, const Predicate &predicate)
{
auto scoresGetter = [&predicate](Format fmt) {
return predicate(fmt) ? BestAVScore : NotSuitableAVScore;
};
return findBestAVFormat(fmts, scoresGetter).first;
}
template<typename Format, typename CalculateScore>
std::pair<Format, AVScore> findBestAVFormat(const Format *fmts,
const CalculateScore &calculateScore)
{
std::pair result(Format(-1), NotSuitableAVScore);
if (fmts) {
for (; *fmts != -1 && result.second != BestAVScore; ++fmts) {
const auto score = calculateScore(*fmts);
if (score > result.second)
result = std::pair(*fmts, score);
}
}
return result;
}
bool isHwPixelFormat(AVPixelFormat format);
inline bool isSwPixelFormat(AVPixelFormat format)
{
return !isHwPixelFormat(format);
}
AVPixelFormat pixelFormatForHwDevice(AVHWDeviceType deviceType);
#ifdef Q_OS_DARWIN
bool isCVFormatSupported(uint32_t format);
std::string cvFormatToString(uint32_t format);
#endif
}
QT_END_NAMESPACE
#endif
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