| 1 | // Copyright (C) 2025 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QFFMPEGTIME_P_H |
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| 5 | #define QFFMPEGTIME_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include "qglobal.h" |
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| 19 | |
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| 20 | #include <QtMultimedia/private/qtaggedtime_p.h> |
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| 21 | #include <QtFFmpegMediaPluginImpl/private/qffmpeg_p.h> |
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| 22 | |
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| 23 | #include <chrono> |
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| 24 | |
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| 25 | QT_BEGIN_NAMESPACE |
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| 26 | |
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| 27 | namespace QFFmpeg { |
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| 28 | |
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| 29 | using namespace std::chrono_literals; |
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| 30 | |
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| 31 | struct TrackTimeTag; |
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| 32 | // track position in microseconds, used as |
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| 33 | // a general time position in the playback engine |
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| 34 | using TrackPosition = QTaggedTimePoint<qint64, TrackTimeTag>; |
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| 35 | using TrackDuration = QTaggedDuration<qint64, TrackTimeTag>; |
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| 36 | |
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| 37 | struct UserTrackTimeTag; |
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| 38 | // track position in milliseconds, that matches the postion in the public API |
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| 39 | using UserTrackPosition = QTaggedTimePoint<qint64, UserTrackTimeTag>; |
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| 40 | using UserTrackDuration = QTaggedDuration<qint64, UserTrackTimeTag>; |
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| 41 | |
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| 42 | struct AVStreamTimeTag; |
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| 43 | // position in AVStream, in 'AVStream::time_base * 1sec' units |
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| 44 | using AVStreamPosition = QTaggedTimePoint<qint64, AVStreamTimeTag>; |
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| 45 | using AVStreamDuration = QTaggedDuration<qint64, AVStreamTimeTag>; |
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| 46 | |
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| 47 | struct AVContextTimeTag; |
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| 48 | // position in the AVFormatContext, in '1sec / AV_TIME_BASE' units, which is actually |
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| 49 | // microseconds. The position is shifted on AVFormatContext::start_time from TrackTime. |
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| 50 | using AVContextPosition = QTaggedTimePoint<qint64, AVContextTimeTag>; |
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| 51 | using AVContextDuration = QTaggedDuration<qint64, AVContextTimeTag>; |
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| 52 | |
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| 53 | using RealClock = std::chrono::steady_clock; |
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| 54 | |
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| 55 | inline AVContextDuration contextStartOffset(const AVFormatContext *formatContext) |
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| 56 | |
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| 57 | { |
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| 58 | return AVContextDuration( |
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| 59 | formatContext->start_time == AV_NOPTS_VALUE ? 0 : formatContext->start_time); |
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| 60 | } |
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| 61 | |
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| 62 | inline UserTrackPosition toUserPosition(TrackPosition trackPosition) |
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| 63 | { |
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| 64 | return UserTrackPosition(trackPosition.get() / 1000); |
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| 65 | } |
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| 66 | |
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| 67 | inline UserTrackDuration toUserDuration(TrackDuration trackDuration) |
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| 68 | { |
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| 69 | return UserTrackDuration(trackDuration.get() / 1000); |
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| 70 | } |
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| 71 | |
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| 72 | inline TrackDuration toTrackDuration(AVContextDuration contextDuration) |
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| 73 | { |
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| 74 | return TrackDuration(contextDuration.get() * 1'000'000 / AV_TIME_BASE); |
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| 75 | } |
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| 76 | |
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| 77 | inline TrackPosition toTrackPosition(UserTrackPosition userTrackPosition) |
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| 78 | { |
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| 79 | return TrackPosition(userTrackPosition.get() * 1000); |
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| 80 | } |
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| 81 | |
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| 82 | inline TrackDuration toTrackDuration(UserTrackDuration userTrackDuration) |
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| 83 | { |
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| 84 | return TrackDuration(userTrackDuration.get() * 1000); |
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| 85 | } |
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| 86 | |
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| 87 | inline TrackDuration toTrackDuration(AVStreamDuration streamDuration, const AVStream *avStream) |
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| 88 | { |
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| 89 | return TrackDuration(timeStampUs(ts: streamDuration.get(), base: avStream->time_base).value_or(u: 0)); |
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| 90 | } |
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| 91 | |
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| 92 | inline TrackPosition toTrackPosition(AVStreamPosition streamPosition, const AVStream *avStream, |
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| 93 | const AVFormatContext *formatContext) |
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| 94 | { |
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| 95 | const auto duration = toTrackDuration(streamDuration: streamPosition.asDuration(), avStream) |
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| 96 | - toTrackDuration(contextDuration: contextStartOffset(formatContext)); |
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| 97 | return duration.asTimePoint(); |
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| 98 | } |
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| 99 | |
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| 100 | inline AVContextPosition toContextPosition(TrackPosition trackPosition, |
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| 101 | const AVFormatContext *formatContext) |
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| 102 | { |
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| 103 | |
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| 104 | return AVContextPosition(trackPosition.get() * AV_TIME_BASE / 1'000'000) |
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| 105 | + contextStartOffset(formatContext); |
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| 106 | } |
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| 107 | |
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| 108 | } // namespace QFFmpeg |
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| 109 | |
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| 110 | QT_END_NAMESPACE |
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| 111 | |
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| 112 | #endif // QFFMPEGTIME_P_H |
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| 113 | |
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