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audio: Don't stack-allocate resampler padding.

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(I thought padding size ranged from 5 frames to ~30 frames (based around
RESAMPLER_ZERO_CROSSINGS, which is 5), but it's actually between 512 and
several thousands (based on RESAMPLER_SAMPLES_PER_ZERO_CROSSING)). It gets
big fast when downsampling.
This commit is contained in:
Ryan C. Gordon 2017-10-10 22:18:46 -04:00
parent b647bd0692
commit 42fff7ce2b
1 changed files with 2 additions and 3 deletions
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5
src/audio/SDL_audiocvt.c
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@ -722,16 +722,15 @@ SDL_ResampleCVT(SDL_AudioCVT *cvt, const int chans, const SDL_AudioFormat format
SDL_assert(format == AUDIO_F32SYS);
/* we keep no streaming state here, so pad with silence on both ends. */
padding = SDL_stack_alloc(float, paddingsamples);
padding = (float *) SDL_calloc(paddingsamples, sizeof (float));
if (!padding) {
SDL_OutOfMemory();
return;
}
SDL_memset(padding, '\0', paddingsamples * sizeof (float));
cvt->len_cvt = SDL_ResampleAudio(chans, inrate, outrate, padding, padding, src, srclen, dst, dstlen);
SDL_stack_free(padding);
SDL_free(padding);
SDL_memcpy(cvt->buf, dst, cvt->len_cvt); /* !!! FIXME: remove this if we can get the resampler to work in-place again. */