// Calls the effect on input buffer and returns output buffer when complete
static int fxCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
// Port audio variables
SAMPLE *out = (SAMPLE*)outputBuffer;
SAMPLE *tmp_buff = (SAMPLE*)outputBuffer;
const SAMPLE *in = (const SAMPLE*)inputBuffer;
unsigned int i;
(void) timeInfo; /* Prevent unused variable warnings. */
(void) statusFlags;
(void) userData;
// Pitch Shift variables
long buffer_size = FRAMES_PER_BUFFER;
float sr = SAMPLE_RATE;
long fftSize = 2048;
long osamp = 32;
float pitchShift = pow(2., semitones/12.);
int measure = 0;
// Fill input buffer
if( inputBuffer == NULL )
{
for( i=0; i<framesPerBuffer; i++ )
{
*out++ = 0; /* left - silent */
}
}
else // playback
{
// Buffer based effect
PitchShift(pitchShift, buffer_size , fftSize, osamp, sr, (float *)in, out);
// Melody
measure = 10000;
if (count == measure) {
semitones = 0;
printf("Setting semitone to %ld...\n", semitones);
} else if (count == measure * 1/8) {
semitones += 4;
printf("Setting semitone to %ld...\n", semitones);
} else if (count == measure * 2/4) {
semitones += 3;
printf("Setting semitone to %ld...\n", semitones);
} else if (count == measure * 3/4) {
semitones += 4;
printf("Setting semitone to %ld...\n", semitones);
}
}
// printf("%d\n", count );
count = (count + 1) % measure;
return paContinue;
}
//
// Starting a sound means adding it
// to the current list of active sounds
// in the internal channels.
// As the SFX info struct contains
// e.g. a pointer to the raw data,
// it is ignored.
// As our sound handling does not handle
// priority, it is ignored.
// Pitching (that is, increased speed of playback)
// is set, but currently not used by mixing.
//
int I_SDL_StartSound(sfxinfo_t *sfxinfo, int channel, int vol, int sep, int pitch)
{
allocated_sound_t *snd;
if (!sound_initialized || channel < 0 || channel >= NUM_CHANNELS)
return -1;
// Release a sound effect if there is already one playing
// on this channel
ReleaseSoundOnChannel(channel);
// Get the sound data
if (!LockSound(sfxinfo))
return -1;
snd = GetAllocatedSoundBySfxInfoAndPitch(sfxinfo, pitch);
if (!snd)
{
allocated_sound_t *newsnd;
// fetch the base sound effect, un-pitch-shifted
snd = GetAllocatedSoundBySfxInfoAndPitch(sfxinfo, NORM_PITCH);
if (!snd)
return -1;
if (s_randompitch)
{
newsnd = PitchShift(snd, pitch);
if (newsnd)
{
LockAllocatedSound(newsnd);
UnlockAllocatedSound(snd);
snd = newsnd;
}
}
}
else
LockAllocatedSound(snd);
// play sound
Mix_PlayChannel(channel, &snd->chunk, 0);
channels_playing[channel] = snd;
// set separation, etc.
I_SDL_UpdateSoundParams(channel, vol, sep);
return channel;
}