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1
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1 #pragma once
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2 #include <math.h>
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3
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4 #ifdef _MSC_VER
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5 #include <intrin.h>
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6 #endif
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7
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8
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9 namespace pfc {
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10 // made a class so it can be redirected to an alternate class more easily than with namespacing
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11 // in win desktop fb2k these are implemented in a DLL
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12 class audio_math {
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13 public:
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14
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15 //! p_source/p_output can point to same buffer
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16 static void convert_to_int16(const float* p_source, size_t p_count, int16_t * p_output, float p_scale);
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17 static void convert_to_int16(const double* p_source, size_t p_count, int16_t* p_output, double p_scale);
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18 static void convert_to_int32(const float* p_source, size_t p_count, int32_t * p_output, float p_scale);
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19 static void convert_to_int32(const double* p_source, size_t p_count, int32_t* p_output, double p_scale);
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20 static void convert_from_int16(const int16_t * p_source, size_t p_count, float * p_output, float p_scale);
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21 static void convert_from_int16(const int16_t* p_source, size_t p_count, double * p_output, double p_scale);
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22 static void convert_from_int32(const int32_t* p_source, size_t p_count, float* p_output, float p_scale);
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23 static void convert_from_int32(const int32_t* p_source, size_t p_count, double* p_output, double p_scale);
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24 static void convert_to_int24(const float* in, size_t count, void* out, float scale);
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25 static void convert_to_int24(const double* in, size_t count, void* out, double scale);
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26
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27 static float calculate_peak(const float * p_source, size_t p_count);
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28 static double calculate_peak(const double * p_source, size_t p_count);
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29
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30 static void remove_denormals(float * p_buffer, size_t p_count);
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31 static void remove_denormals(double * p_buffer, size_t p_count);
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32
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33
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34 static void add_offset(float * p_buffer, float p_delta, size_t p_count);
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35 static void add_offset(double * p_buffer, double p_delta, size_t p_count);
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36
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37 static void scale(const float* p_source, size_t p_count, float * p_output, float p_scale);
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38 static void scale(const double* p_source, size_t p_count, double * p_output, double p_scale);
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39
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40 static void convert(const float* in, float* out, size_t count);
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41 static void convert(const float* in, float* out, size_t count, float scale);
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42 static void convert(const float* in, double* out, size_t count);
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43 static void convert(const float* in, double* out, size_t count, double scale);
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44 static void convert(const double* in, float* out, size_t count);
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45 static void convert(const double* in, float* out, size_t count, double scale);
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46 static void convert(const double* in, double* out, size_t count);
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47 static void convert(const double* in, double* out, size_t count, double scale);
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48
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49 inline static int64_t rint64(float val) { return (int64_t)llrint(val); }
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50 inline static int32_t rint32(float val) { return (int32_t)lrint(val); }
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51 inline static int64_t rint64(double val) { return (int64_t)llrint(val); }
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52 inline static int32_t rint32(double val) { return (int32_t)lrint(val); }
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53
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54 static inline uint64_t time_to_samples(double p_time, uint32_t p_sample_rate) {
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55 return (uint64_t)pfc::rint64((double)p_sample_rate * p_time);
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56 }
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57
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58 static inline double samples_to_time(uint64_t p_samples, uint32_t p_sample_rate) {
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59 PFC_ASSERT(p_sample_rate > 0);
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60 return (double)p_samples / (double)p_sample_rate;
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61 }
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62
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63 static inline double gain_to_scale(double p_gain) { return pow(10.0, p_gain / 20.0); }
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64 static inline double scale_to_gain(double scale) { return 20.0*log10(scale); }
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65
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66 static unsigned bitrate_kbps( uint64_t fileSize, double duration );
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67
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68 static constexpr float float16scale = 65536.f;
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69
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70 static float decodeFloat24ptr(const void* sourcePtr);
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71 static float decodeFloat24ptrbs(const void* sourcePtr);
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72 static float decodeFloat16(uint16_t source);
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73 }; // class audio_math
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74
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75 } // namespace pfc
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