Differential D1358 Diff 4419 extern/audaspace/plugins/ffmpeg/FFMPEGReader.h

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extern/audaspace/plugins/ffmpeg/FFMPEGReader.h

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				/*******************************************************************************
				* Copyright 2009-2015 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 <string>
				#include <memory>

				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 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;

				/**
				* The buffer to read with.
				*/
				data_t* m_membuf;

				/**
				* Reading position of the buffer.
				*/
				int64_t m_membufferpos;

				/**
				* Whether the audio data has to be interleaved after reading.
				*/
				bool m_tointerleave;

				/**
				* 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.
				*/
				AUD_LOCAL void init();

				// 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.
				* \exception Exception Thrown if the file specified does not exist or
				* cannot be read with ffmpeg.
				*/
				FFMPEGReader(std::string filename);

				/**
				* Creates a new reader.
				* \param buffer The buffer to read from.
				* \exception Exception Thrown if the buffer specified cannot be read
				* with ffmpeg.
				*/
				FFMPEGReader(std::shared_ptr<Buffer> buffer);

				/**
				* Destroys the reader and closes the file.
				*/
				virtual ~FFMPEGReader();

				/**
				* 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