sf3_audio.h

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#ifndef __SF3_AUDIO__
#define __SF3_AUDIO__
#include "sf3_core.h"
 
#define SF3_FORMAT_ID_AUDIO 0x02
 
enum sf3_audio_format{
  SF3_SAMPLE_ALAW = 0x01,
  SF3_SAMPLE_INT16 = 0x02,
  SF3_SAMPLE_INT32 = 0x04,
  SF3_SAMPLE_INT64 = 0x08,
  SF3_SAMPLE_ULAW = 0x11,
  SF3_SAMPLE_UINT16 = 0x12,
  SF3_SAMPLE_UINT32 = 0x14,
  SF3_SAMPLE_UINT64 = 0x18,
  SF3_SAMPLE_FLOAT16 = 0x22,
  SF3_SAMPLE_FLOAT32 = 0x24,
  SF3_SAMPLE_FLOAT64 = 0x28
};
 
struct SF3_PACK sf3_audio{
  struct sf3_identifier identifier;
  uint32_t samplerate;
  uint8_t channels;
  uint8_t format;
  uint64_t frame_count;
  char samples[];
};
 
SF3_INLINE int sf3_audio_sample_size(const struct sf3_audio *audio){
  return audio->format & 0x0F;
}
 
SF3_INLINE int sf3_audio_frame_size(const struct sf3_audio *audio){
  return (audio->format & 0x0F) * audio->channels;
}
 
SF3_INLINE int sf3_audio_sample_count(const struct sf3_audio *audio){
  return audio->frame_count * audio->channels;
}
 
SF3_INLINE float sf3_audio_duration(const struct sf3_audio *audio){
  return ((double)audio->frame_count) / audio->samplerate;
}
 
SF3_EXPORT char *sf3_audio_format(enum sf3_audio_format format){
  switch(format){
  case SF3_SAMPLE_ALAW: return "A-law";
  case SF3_SAMPLE_INT16: return "int16";
  case SF3_SAMPLE_INT32: return "int32";
  case SF3_SAMPLE_INT64: return "int64";
  case SF3_SAMPLE_ULAW: return "u-law";
  case SF3_SAMPLE_UINT16: return "uint16";
  case SF3_SAMPLE_UINT32: return "uint32";
  case SF3_SAMPLE_UINT64: return "uint64";
  case SF3_SAMPLE_FLOAT16: return "float2";
  case SF3_SAMPLE_FLOAT32: return "float4";
  case SF3_SAMPLE_FLOAT64: return "float8";
  default: return "Unknown";
  }
}
 
SF3_EXPORT size_t sf3_audio_size(const struct sf3_audio *audio){
  return sizeof(struct sf3_audio)
    + sf3_audio_sample_count(audio) * sf3_audio_sample_size(audio);
}
#endif