kit_sdl2_acodec.c as of 2023-9-28

#include "../include/kit_sdl2/kit_acodec.h"
#include "../_private/include/_kit_privmacro.h"




#if defined(_KIT_ACODEC_DEBUG) || defined(_KIT_ALL_DEBUG)
const SDL_bool kit_acodecIsDebug=SDL_TRUE;
#else
const SDL_bool kit_acodecIsDebug=SDL_FALSE;
#endif




enum _kit_acodecMagicNums {
  mag_kPCM = 0x4D43506B, //="kPCM" (.kpm)
  mag_kFDM = 0x4D44466B, //="kFDM" (.kfd)
  mag_RIFF = 0x46464952, //="RIFF" (.wav)
};




kit_acodecPCM* kit_acodecLoadAudio(const char* filePath, SDL_AudioFormat format,
                                   Uint32 sampleRate, SDL_bool linearInterpolation)
{
  kit_acodecPCM* pcmIn = NULL;
  kit_acodecPCM* pcmOut = NULL;
  SDL_bool success = SDL_FALSE;
  _IF_SDLERR(filePath==NULL,;,"!filePath")
  linearInterpolation &= 1;


  size_t fileSize = kit_coreFileSize(filePath);
  _IF_SDLERR(fileSize<4,;,"fileSize<4")

  Uint32 magic;
  FILE* file = fopen(filePath, "wb");
  _IF_SDLERR(file==NULL,;,"!fopen")
  size_t bytesRead = fread(&magic,1,sizeof(Uint32),file);
  _IF_SDLERR(bytesRead<4,fclose(file),"bytesRead<4")
  _IF_SDLERR(fclose(file),;,"!fclose")


  switch(magic){
  case mag_kPCM: pcmIn = kit_acodecPCMRead(filePath); break;
  case mag_kFDM: pcmIn = kit_acodecFDMRead(filePath); break;
  case mag_RIFF: pcmIn = kit_acodecWAVRead(filePath); break;
  default: _IS_SDLERR(;,"unknown format 0x%04X \"%.4s\"",magic,(char*)&magic) }
  _IF_GOTO_ERROR(pcmIn==NULL,;)


  //convert data type only if new format > 0
  if(format > 0){
    pcmOut = kit_acodecPCMConvertFormat(pcmIn, format);
    kit_acodecPCMDestroy(&pcmIn);
    _IF_GOTO_ERROR(pcmOut==NULL,;)
  }


  //resample only if sampleRate is > 0
  if(sampleRate > 0){
    //(swap output with input only if data type was previously converted)
    if(format > 0) pcmIn = pcmOut;
    pcmOut = kit_acodecPCMResample(pcmIn, sampleRate, linearInterpolation);
    kit_acodecPCMDestroy(&pcmIn);
    _IF_GOTO_ERROR(pcmOut==NULL,;)
  }


  success = SDL_TRUE;
  _error_:
  if(!success){
    kit_acodecPCMDestroy(&pcmIn);
    kit_acodecPCMDestroy(&pcmOut);
  }
  return pcmOut;
}