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#ifndef AUDIOGRAPHER_SAMPLE_FORMAT_CONVERTER_H
#define AUDIOGRAPHER_SAMPLE_FORMAT_CONVERTER_H
#include "listed_source.h"
#include "sink.h"
#include "gdither/gdither_types.h"
namespace AudioGrapher
{
/// Dither types from the gdither library
enum DitherType
{
D_None = GDitherNone, ///< No didtering
D_Rect = GDitherRect, ///< Rectangular dithering, i.e. white noise
D_Tri = GDitherTri, ///< Triangular dithering
D_Shaped = GDitherShaped ///< Actually noise shaping, only works for 46kHzish signals
};
/** Sample format converter that does dithering.
* This class can only convert floats to either \a float, \a int32_t, \a int16_t, or \a uint8_t
*/
template <typename TOut>
class SampleFormatConverter : public Sink<float>, public ListedSource<TOut>
{
public:
/** Constructor
* \param channels number of channels in stream
*/
SampleFormatConverter (uint32_t channels);
~SampleFormatConverter ();
/** Initialize and allocate buffers for processing.
* \param max_frames maximum number of frames that is allowed to be used in calls to \a process()
* \param type dither type from \a DitherType
* \param data_width data with in bits
* \note If the non-const version of process() is used with floats,
* there is no need to call this function.
*/
void init (nframes_t max_frames, int type, int data_width);
/// Set whether or not clipping to [-1.0, 1.0] should occur when TOut = float. Clipping is off by default
void set_clip_floats (bool yn) { clip_floats = yn; }
/// Processes data without modifying it
void process (ProcessContext<float> const & c_in);
/// This version is only different in the case when \a TOut = float, and float clipping is on.
void process (ProcessContext<float> & c_in);
private:
void reset();
void init_common(nframes_t max_frames); // not-template-specialized part of init
void check_frame_count(nframes_t frames);
uint32_t channels;
GDither dither;
nframes_t data_out_size;
TOut * data_out;
bool clip_floats;
};
} // namespace
#endif // AUDIOGRAPHER_SAMPLE_FORMAT_CONVERTER_H
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