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audio: Several fixes to "simple" resampler (thanks, Vitaly!).

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Fixes Bugzilla #3551.
This commit is contained in:
Ryan C. Gordon 2017-01-18 02:11:56 -05:00
parent 95defd6620
commit 3e1679c885
1 changed files with 8 additions and 8 deletions
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16
src/audio/SDL_audiocvt.c
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@ -196,31 +196,31 @@ SDL_ResampleAudioSimple(const int chans, const double rate_incr,
float *last_sample, const float *inbuf,
const int inbuflen, float *outbuf, const int outbuflen)
{
const int framelen = chans * sizeof (float);
const int framelen = chans * (int)sizeof (float);
const int total = (inbuflen / framelen);
const int finalpos = total - chans;
const int finalpos = (total * chans) - chans;
const int dest_samples = (int)(((double)total) * rate_incr);
const double src_incr = 1.0 / rate_incr;
double idx = 0.0;
float *dst = outbuf;
int consumed = 0;
float *target = (dst + (dest_samples * chans));
double idx = 0.0;
int i;
SDL_assert((dest_samples * framelen) <= outbuflen);
SDL_assert((inbuflen % framelen) == 0);
while (consumed < total) {
while(dst < target) {
const int pos = ((int)idx) * chans;
const float *src = &inbuf[(pos >= finalpos) ? finalpos : pos];
SDL_assert(dst < (outbuf + (outbuflen / framelen)));
for (i = 0; i < chans; i++) {
const float val = *(src++);
*(dst++) = (val + last_sample[i]) * 0.5f;
last_sample[i] = val;
}
consumed = pos + chans;
idx += src_incr;
}
return (int) ((dst - outbuf) * sizeof (float));
return (int) ((dst - outbuf) * (int)sizeof(float));
}