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audio: clamp resampler interpolation values to prevent buffer overflow. 

Partially fixes Bugzilla #3848.
This commit is contained in:
Ryan C. Gordon 2017-10-11 02:33:55 -04:00
parent 0085f917e0
commit 763c387149
1 changed files with 2 additions and 3 deletions
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5
src/audio/SDL_audiocvt.c
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@ -501,10 +501,9 @@ SDL_ResampleAudio(const int chans, const int inrate, const int outrate,
const int srcindex = (int) (outtime * inrate); const int srcindex = (int) (outtime * inrate);
const float intime = ((float) srcindex) / finrate; const float intime = ((float) srcindex) / finrate;
const float innexttime = ((float) (srcindex + 1)) / finrate; const float innexttime = ((float) (srcindex + 1)) / finrate;
const float interpolation1 = SDL_max(0.0f, 1.0f - (innexttime - outtime) / (innexttime - intime));
const float interpolation1 = 1.0f - (innexttime - outtime) / (innexttime - intime);
const int filterindex1 = (int) (interpolation1 * RESAMPLER_SAMPLES_PER_ZERO_CROSSING); const int filterindex1 = (int) (interpolation1 * RESAMPLER_SAMPLES_PER_ZERO_CROSSING);
const float interpolation2 = 1.0f - interpolation1; const float interpolation2 = SDL_max(0.0f, 1.0f - interpolation1);
const int filterindex2 = (int) (interpolation2 * RESAMPLER_SAMPLES_PER_ZERO_CROSSING); const int filterindex2 = (int) (interpolation2 * RESAMPLER_SAMPLES_PER_ZERO_CROSSING);
for (chan = 0; chan < chans; chan++) { for (chan = 0; chan < chans; chan++) {