Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/plugins/ffmpeg/FFMPEGReader.h

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+/*******************************************************************************
+ * Copyright 2009-2024 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+#ifdef FFMPEG_PLUGIN
+#define AUD_BUILD_PLUGIN
+#endif
+
+/**
+ * @file FFMPEGReader.h
+ * @ingroup plugin
+ * The FFMPEGReader class.
+ */
+
+#include "respec/ConverterFunctions.h"
+#include "IReader.h"
+#include "util/Buffer.h"
+#include "file/FileInfo.h"
+
+#include <string>
+#include <memory>
+#include <vector>
+
+struct AVCodecContext;
+extern "C" {
+#include <libavformat/avformat.h>
+}
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This class reads a sound file via ffmpeg.
+ * \warning Seeking may not be accurate! Moreover the position is updated after
+ *          a buffer reading call. So calling getPosition right after seek
+ *          normally results in a wrong value.
+ */
+class AUD_PLUGIN_API FFMPEGReader : public IReader
+{
+private:
+	/**
+	 * The current position in samples.
+	 */
+	int m_position;
+
+	/**
+	 * The specification of the audio data.
+	 */
+	DeviceSpecs m_specs;
+
+	/**
+	 * The buffer for package reading.
+	 */
+	Buffer m_pkgbuf;
+
+	/**
+	 * The count of samples still available from the last read package.
+	 */
+	int m_pkgbuf_left;
+
+	/**
+	 * The AVFormatContext structure for using ffmpeg.
+	 */
+	AVFormatContext* m_formatCtx;
+
+	/**
+	 * The AVCodecContext structure for using ffmpeg.
+	 */
+	AVCodecContext* m_codecCtx;
+
+	/**
+	 * The AVFrame structure for using ffmpeg.
+	 */
+	AVFrame* m_frame;
+
+	/**
+	 * The AVIOContext to read the data from.
+	 */
+	AVIOContext* m_aviocontext;
+
+	/**
+	 * The stream ID in the file.
+	 */
+	int m_stream;
+
+	/**
+	 * Converter function.
+	 */
+	convert_f m_convert;
+
+	/**
+	 * The memory file to read from.
+	 */
+	std::shared_ptr<Buffer> m_membuffer;
+
+	/**
+	 * Reading position of the buffer.
+	 */
+	long long m_membufferpos;
+
+	/**
+	 * Whether the audio data has to be interleaved after reading.
+	 */
+	bool m_tointerleave;
+
+	/**
+	 * Converts an ffmpeg sample format to an audaspace one.
+	 * \param format The AVSampleFormat sample format.
+	 * \return The sample format as SampleFormat.
+	 */
+	AUD_LOCAL static SampleFormat convertSampleFormat(AVSampleFormat format);
+
+	/**
+	 * Decodes a packet into the given buffer.
+	 * \param packet The AVPacket to decode.
+	 * \param buffer The target buffer.
+	 * \return The count of read bytes.
+	 */
+	AUD_LOCAL int decode(AVPacket& packet, Buffer& buffer);
+
+	/**
+	 * Initializes the object.
+	 * \param stream The index of the audio stream within the file if it contains multiple audio streams.
+	 */
+	AUD_LOCAL void init(int stream);
+
+	// delete copy constructor and operator=
+	FFMPEGReader(const FFMPEGReader&) = delete;
+	FFMPEGReader& operator=(const FFMPEGReader&) = delete;
+
+public:
+	/**
+	 * Creates a new reader.
+	 * \param filename The path to the file to be read.
+	 * \param stream The index of the audio stream within the file if it contains multiple audio streams.
+	 * \exception Exception Thrown if the file specified does not exist or
+	 *            cannot be read with ffmpeg.
+	 */
+	FFMPEGReader(const std::string &filename, int stream = 0);
+
+	/**
+	 * Creates a new reader.
+	 * \param buffer The buffer to read from.
+	 * \param stream The index of the audio stream within the file if it contains multiple audio streams.
+	 * \exception Exception Thrown if the buffer specified cannot be read
+	 *                          with ffmpeg.
+	 */
+	FFMPEGReader(std::shared_ptr<Buffer> buffer, int stream = 0);
+
+	/**
+	 * Destroys the reader and closes the file.
+	 */
+	virtual ~FFMPEGReader();
+
+	/**
+	 * Queries the streams of a sound file.
+	 * \return A vector with as many streams as there are in the file.
+	 * \exception Exception Thrown if the file specified cannot be read.
+	 */
+	virtual std::vector<StreamInfo> queryStreams();
+
+	/**
+	 * Reads data to a memory buffer.
+	 * This function is used for avio only.
+	 * @param opaque The FFMPEGReader.
+	 * @param buf The buffer to read to.
+	 * @param buf_size The size of the buffer.
+	 * @return How many bytes have been read.
+	 */
+	static int read_packet(void* opaque, uint8_t* buf, int buf_size);
+
+	/**
+	 * Seeks within data.
+	 * This function is used for avio only.
+	 * @param opaque The FFMPEGReader.
+	 * @param offset The byte offset to seek to.
+	 * @param whence The seeking action.
+	 * @return The current position or the size of the data if requested.
+	 */
+	static int64_t seek_packet(void* opaque, int64_t offset, int whence);
+
+	virtual bool isSeekable() const;
+	virtual void seek(int position);
+	virtual int getLength() const;
+	virtual int getPosition() const;
+	virtual Specs getSpecs() const;
+	virtual void read(int& length, bool& eos, sample_t* buffer);
+};
+
+AUD_NAMESPACE_END