audioresampler.h

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#pragma once
 
#include <functional>
 
#include "ffmpeg.h"
#include "frame.h"
#include "dictionary.h"
#include "avutils.h"
#include "sampleformat.h"
#include "averror.h"
 
namespace av {
 
// TODO: support New Channel Layout directly
 
class AudioResampler : public FFWrapperPtr<SwrContext>, public noncopyable
{
public:
    AudioResampler();
 
    AudioResampler(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
                   uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
                   OptionalErrorCode ec = throws());
 
    AudioResampler(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
                   uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
                   Dictionary &options,
                   OptionalErrorCode ec = throws());
 
    AudioResampler(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
                   uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
                   Dictionary &&options,
                   OptionalErrorCode ec = throws());
 
    ~AudioResampler();
 
    AudioResampler(AudioResampler &&other);
    AudioResampler& operator=(AudioResampler &&rhs);
 
    void swap(AudioResampler& other);
 
    uint64_t       dstChannelLayout() const;
    int            dstChannels()      const;
    int            dstSampleRate()    const;
    SampleFormat   dstSampleFormat()  const;
 
    uint64_t       srcChannelLayout() const;
    int            srcChannels()      const;
    int            srcSampleRate()    const;
    SampleFormat   srcSampleFormat()  const;
 
    void push(const AudioSamples &src, OptionalErrorCode ec = throws());
 
    bool pop(AudioSamples &dst, bool getall, OptionalErrorCode ec = throws());
 
    AudioSamples pop(size_t samplesCount, OptionalErrorCode ec = throws());
 
    bool isValid() const;
    operator bool() const { return isValid(); }
 
    int64_t delay() const;
 
    bool init(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
              uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
              OptionalErrorCode ec = throws());
 
    bool init(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
              uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
              Dictionary &options,
              OptionalErrorCode ec = throws());
 
    bool init(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
              uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
              Dictionary &&options,
              OptionalErrorCode ec = throws());
 
    static
    bool validate(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat);
 
private:
    bool init(uint64_t dstChannelsLayout, int dstRate, SampleFormat dstFormat,
              uint64_t srcChannelsLayout, int srcRate, SampleFormat srcFormat,
              AVDictionary **dict, OptionalErrorCode ec);
 
private:
    // Cached values to avoid access to the av_opt
    uint64_t       m_dstChannelsLayout;
    int            m_dstRate;
    SampleFormat   m_dstFormat;
    uint64_t       m_srcChannelsLayout;
    int            m_srcRate;
    SampleFormat   m_srcFormat;
 
    int            m_streamIndex = -1;
    Timestamp      m_prevPts;
    Timestamp      m_nextPts;
 
    int64_t        m_filterSize;
};
 
} // namespace av