streamtools/resampler.hpp

   1 #ifndef _resampler__hpp__included__
   2 #define _resampler__hpp__included__
   3
   4 #include "digital-filter.hpp"
   5 #include "newpacket.hpp"
   6 #include "opl.h"
   7
   8 uint64_t next_sample_time(uint64_t time, uint32_t rate);
   9
  10 struct resampler
  11 {
  12         virtual ~resampler();
  13         virtual sample_number_t nextsample() = 0;
  14         virtual void sendpacket(struct packet& p) = 0;
  15 };
  16
  17 struct resampler_pcm : public resampler
  18 {
  19         resampler_pcm(uint32_t rate);
  20         sample_number_t nextsample();
  21         void sendpacket(struct packet& p);
  22 private:
  23         bool written;
  24         uint32_t output_rate;
  25         uint64_t last_read_time;
  26         uint64_t last_write_time;
  27         npair<int64_t> accumulator;
  28         npair<short> current_levels;
  29 };
  30
  31 struct resampler_fm : public resampler
  32 {
  33         resampler_fm(uint32_t rate);
  34         sample_number_t nextsample();
  35         void sendpacket(struct packet& p);
  36 private:
  37         opl_context ctx;
  38 };
  39
  40 struct packet_demux
  41 {
  42         packet_demux(mixer& mix, uint32_t rate);
  43         ~packet_demux();
  44         sample_number_t nextsample();
  45         void sendpacket(struct packet& p);
  46         void sendoption(const std::string& option);
  47 private:
  48         void do_volume_change(struct packet& p);
  49         mixer& use_mixer;
  50         uint32_t used_rate;
  51         std::map<uint32_t, resampler*> resamplers;
  52         composite_filter* output_filter;
  53         std::map<std::string, composite_filter*> input_filters;
  54 };
  55
  56 void print_audio_resampler_help(const std::string& prefix);
  57 void process_audio_resampler_options(packet_demux& d, const std::string& prefix, int argc, char** argv);
  58
  59 #endif