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/*******************************************************************************
* Copyright 2009-2016 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;
/**
* The buffer to read with.
*/
data_t* m_membuf;
/**
* 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(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
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