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/**********************************************************************
Audacity: A Digital Audio Editor
FFmpegFunctions.h
Dmitry Vedenko
**********************************************************************/
#pragma once
#include <memory>
#include <vector>
#include <wx/string.h>
#include "AVCodecFunctions.h"
#include "AVFormatFunctions.h"
#include "AVUtilFunctions.h"
#include "AVCodecID.h"
#include "wrappers/AVDictionaryWrapper.h"
#include "wrappers/AVIOContextWrapper.h"
#include "wrappers/AVFormatContextWrapper.h"
#include "wrappers/AVStreamWrapper.h"
#include "wrappers/AVPacketWrapper.h"
#include "wrappers/AVFrameWrapper.h"
#include "wrappers/AVInputFormatWrapper.h"
#include "wrappers/AVOutputFormatWrapper.h"
#include "wrappers/AVCodecWrapper.h"
#include "wrappers/AVCodecContextWrapper.h"
#include "wrappers/AVChannelLayoutWrapper.h"
class StringSetting;
extern FFMPEG_SUPPORT_API StringSetting AVFormatPath;
class FFmpegFunctions;
template <typename T>
class AVAllocator : public std::allocator<T>
{
public:
typedef size_t size_type;
typedef T* pointer;
typedef const T* const_pointer;
template <typename _Tp1> struct rebind
{
typedef AVAllocator<_Tp1> other;
};
pointer allocate(size_type n) noexcept;
void deallocate(pointer p, size_type ) noexcept;
AVAllocator();
AVAllocator(const AVAllocator& a)
: std::allocator<T>(a)
, mFFmpeg(a.mFFmpeg)
{
}
template <class U>
AVAllocator(const AVAllocator<U>& a)
: std::allocator<T>(a)
, mFFmpeg(a.mFFmpeg)
{
}
private:
template <class U> friend class AVAllocator;
std::shared_ptr<FFmpegFunctions> mFFmpeg;
};
template<typename T>
using AVDataBuffer = std::vector<T, AVAllocator<T>>;
struct FFMPEG_SUPPORT_API FFmpegFunctions :
AVCodecFunctions,
AVFormatFunctions,
AVUtilFunctions
{
FFmpegFunctions();
~FFmpegFunctions();
static std::shared_ptr<FFmpegFunctions> Load(bool fromUserPathOnly = false);
AVCodecIDFwd (*GetAVCodecID)(AudacityAVCodecID) = nullptr;
AudacityAVCodecID (*GetAudacityCodecID)(AVCodecIDFwd) = nullptr;
static std::vector<wxString> GetSearchPaths(bool fromUserPathOnly);
std::unique_ptr<AVIOContextWrapper> CreateAVIOContext() const;
std::unique_ptr<AVFormatContextWrapper> CreateAVFormatContext() const;
std::unique_ptr<AVStreamWrapper> CreateAVStreamWrapper(AVStream* stream, bool forEncoding) const;
//! @post return value is not null
std::unique_ptr<AVPacketWrapper> CreateAVPacketWrapper() const;
//! @post return value is not null
std::unique_ptr<AVFrameWrapper> CreateAVFrameWrapper() const;
std::unique_ptr<AVInputFormatWrapper> CreateAVInputFormatWrapper(AVInputFormat* inputFormat) const;
std::unique_ptr<AVOutputFormatWrapper> CreateAVOutputFormatWrapper(const AVOutputFormat* outputFormat) const;
std::unique_ptr<AVCodecWrapper> CreateDecoder(AVCodecIDFwd codecID) const;
std::unique_ptr<AVCodecWrapper> CreateEncoder(AVCodecIDFwd codecID) const;
std::unique_ptr<AVCodecWrapper> CreateEncoder(const char* codecName) const;
std::unique_ptr<AVCodecContextWrapper> CreateAVCodecContextWrapper(AVCodecContext* context) const;
std::unique_ptr<AVCodecContextWrapper> CreateAVCodecContextWrapperFromCodec(std::unique_ptr<AVCodecWrapper> codec) const;
std::unique_ptr<AVOutputFormatWrapper> GuessOutputFormat(const char* short_name, const char* filename, const char* mime_type);
std::unique_ptr<AVChannelLayoutWrapper> CreateDefaultChannelLayout(int channelsCount) const;
std::unique_ptr<AVChannelLayoutWrapper> CreateLegacyChannelLayout(uint64_t layout, int channelsCount) const;
std::unique_ptr<AVChannelLayoutWrapper> CreateAVChannelLayout(const AVChannelLayout* layout) const;
const std::vector<const AVOutputFormatWrapper*>& GetOutputFormats() const;
const std::vector<const AVCodecWrapper*>& GetCodecs() const;
template<typename T>
AVDataBuffer<T> CreateMemoryBuffer(int preallocatedSize) const
{
return AVDataBuffer<T>(preallocatedSize, T {}, AVAllocator<T>());
}
private:
void FillCodecsList();
void FillOuptutFormatsList();
struct Private;
std::unique_ptr<Private> mPrivate;
std::vector<const AVCodecWrapper*> mCodecPointers;
std::vector<std::unique_ptr<AVCodecWrapper>> mCodecs;
std::vector<const AVOutputFormatWrapper*> mOutputFormatPointers;
std::vector<std::unique_ptr<AVOutputFormatWrapper>> mOutputFormats;
};
template<typename T>
typename AVAllocator<T>::pointer
AVAllocator<T>::allocate(typename AVAllocator<T>::size_type n) noexcept
{
if (mFFmpeg)
return static_cast<pointer>(mFFmpeg->av_malloc(n * sizeof(T)));
else
return static_cast<pointer>(::malloc(n * sizeof(T)));
}
template<typename T>
void AVAllocator<T>::deallocate(
typename AVAllocator<T>::pointer p,
typename AVAllocator<T>::size_type ) noexcept
{
if (mFFmpeg)
mFFmpeg->av_free(p);
else
::free(p);
}
template<typename T>
AVAllocator<T>::AVAllocator()
: mFFmpeg(FFmpegFunctions::Load())
{
}
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