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Telegram/SourceFiles/media/audio/media_audio_loader.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "base/bytes.h"
+#include "core/file_location.h"
+#include "media/streaming/media_streaming_utility.h"
+
+namespace Media {
+
+class AudioPlayerLoader {
+public:
+	AudioPlayerLoader(
+		const Core::FileLocation &file,
+		const QByteArray &data,
+		bytes::vector &&buffer);
+	virtual ~AudioPlayerLoader();
+
+	virtual bool check(
+		const Core::FileLocation &file,
+		const QByteArray &data);
+
+	virtual bool open(crl::time positionMs, float64 speed = 1.) = 0;
+	virtual crl::time duration() = 0;
+	virtual int samplesFrequency() = 0;
+	virtual int sampleSize() = 0;
+	virtual int format() = 0;
+
+	virtual void dropFramesTill(int64 samples) {
+	}
+	[[nodiscard]] virtual int64 startReadingQueuedFrames(float64 newSpeed) {
+		Unexpected(
+			"startReadingQueuedFrames() on not AbstractAudioFFMpegLoader");
+	}
+
+	[[nodiscard]] int bytesPerBuffer();
+
+	enum class ReadError {
+		Other,
+		Retry,
+		RetryNotQueued,
+		Wait,
+		EndOfFile,
+	};
+	using ReadResult = std::variant<bytes::const_span, ReadError>;
+	[[nodiscard]] virtual ReadResult readMore() = 0;
+
+	virtual void enqueuePackets(std::deque<FFmpeg::Packet> &&packets) {
+		Unexpected("enqueuePackets() call on not ChildFFMpegLoader.");
+	}
+	virtual void setForceToBuffer(bool force) {
+		Unexpected("setForceToBuffer() call on not ChildFFMpegLoader.");
+	}
+	virtual bool forceToBuffer() const {
+		return false;
+	}
+
+	void saveDecodedSamples(not_null<QByteArray*> samples);
+	void takeSavedDecodedSamples(not_null<QByteArray*> samples);
+	bool holdsSavedDecodedSamples() const;
+	void dropDecodedSamples();
+
+protected:
+	Core::FileLocation _file;
+	bool _access = false;
+	QByteArray _data;
+	bytes::vector _bytes;
+
+	QFile _f;
+	int _dataPos = 0;
+
+	bool openFile();
+
+private:
+	QByteArray _savedSamples;
+	bool _holdsSavedSamples = false;
+
+	int _bytesPerBuffer = 0;
+
+};
+
+} // namespace Media