streamtools/resampler.hpp

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