buffersink.h

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#ifndef AV_BUFFERSINK_H
#define AV_BUFFERSINK_H
 
#include <stdint.h>
#include <memory>
 
#include "ffmpeg.h"
#include "rational.h"
#include "filtercontext.h"
#include "filter.h"
#include "averror.h"
#include "frame.h"
 
namespace av {
 
class BufferSinkFilterContext
{
    // To protect access
    enum {
        ReqUninited,
        ReqGetFrame,
        ReqGetSamples
    };
 
public:
    BufferSinkFilterContext() = default;
    explicit BufferSinkFilterContext(const FilterContext& ctx, OptionalErrorCode ec = throws());
 
    void assign(const FilterContext &ctx, OptionalErrorCode ec = throws());
    BufferSinkFilterContext& operator=(const FilterContext &ctx);
 
 
    bool getVideoFrame(VideoFrame &frame, int flags, OptionalErrorCode ec = throws());
    bool getVideoFrame(VideoFrame &frame, OptionalErrorCode ec = throws());
 
    bool getAudioFrame(AudioSamples &samples, int flags, OptionalErrorCode ec = throws());
    bool getAudioFrame(AudioSamples &samples, OptionalErrorCode ec = throws());
    bool getAudioSamples(AudioSamples &samples, size_t samplesCount, OptionalErrorCode ec = throws());
 
    void     setFrameSize(unsigned size, OptionalErrorCode ec = throws());
    Rational frameRate(OptionalErrorCode ec = throws());
 
    static FilterMediaType checkFilter(const Filter& filter) noexcept;
 
private:
    // AVERROR_EOF and AVERROR(EAGAIN) never thrown, but can be returned via error_code
    // if ec == throws(), false returns silently
    bool getFrame(AVFrame *frame, int flags, OptionalErrorCode ec);
    bool getSamples(AVFrame *frame, int nbSamples, OptionalErrorCode ec);
 
private:
    FilterContext   m_sink;
    FilterMediaType m_type = FilterMediaType::Unknown;
    int             m_req  = ReqUninited;
};
 
 
} // namespace av
 
#endif // AV_BUFFERSINK_H