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audio: Make sure audio stream resampling doesn't overflow buffers.

Ryan C. Gordon 2017-10-11 02:03:05 -04:00
parent 459e2b0bbe
commit cb8bf6bbaf
1 changed files with 10 additions and 4 deletions
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14
src/audio/SDL_audiocvt.c
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@ -1224,6 +1224,7 @@ SDL_ResampleAudioStream(SDL_AudioStream *stream, const void *_inbuf, const int i
const int paddingbytes = paddingsamples * sizeof (float);
float *lpadding = (float *) stream->resampler_state;
const float *rpadding = (const float *) inbufend; /* we set this up so there are valid padding samples at the end of the input buffer. */
const int cpy = SDL_min(inbuflen, paddingbytes);
int retval;
SDL_assert(inbuf != ((const float *) outbuf)); /* SDL_AudioStreamPut() shouldn't allow in-place resamples. */
@ -1231,7 +1232,7 @@ SDL_ResampleAudioStream(SDL_AudioStream *stream, const void *_inbuf, const int i
retval = SDL_ResampleAudio(chans, inrate, outrate, lpadding, rpadding, inbuf, inbuflen, outbuf, outbuflen);
/* update our left padding with end of current input, for next run. */
SDL_memcpy(lpadding, inbufend - paddingbytes, paddingbytes);
SDL_memcpy((lpadding + paddingsamples) - (cpy / sizeof (float)), inbufend - cpy, cpy);
return retval;
}
@ -1462,14 +1463,19 @@ SDL_AudioStreamPut(SDL_AudioStream *stream, const void *buf, const Uint32 _bufle
SDL_memcpy(stream->resampler_padding, workbuf + (buflen - neededpaddingbytes), neededpaddingbytes);
resamplebuf = workbuf + buflen; /* skip to second piece of workbuf. */
buflen = stream->resampler_func(stream, workbuf, buflen - neededpaddingbytes, resamplebuf, resamplebuflen);
SDL_assert(buflen >= neededpaddingbytes);
if (buflen > neededpaddingbytes) {
buflen = stream->resampler_func(stream, workbuf, buflen - neededpaddingbytes, resamplebuf, resamplebuflen);
} else {
buflen = 0;
}
#if DEBUG_AUDIOSTREAM
printf("AUDIOSTREAM: After resampling we have %d bytes\n", buflen);
#endif
}
if (stream->cvt_after_resampling.needed) {
if (stream->cvt_after_resampling.needed && (buflen > 0)) {
stream->cvt_after_resampling.buf = resamplebuf;
stream->cvt_after_resampling.len = buflen;
if (SDL_ConvertAudio(&stream->cvt_after_resampling) == -1) {
@ -1487,7 +1493,7 @@ SDL_AudioStreamPut(SDL_AudioStream *stream, const void *buf, const Uint32 _bufle
#endif
/* resamplebuf holds the final output, even if we didn't resample. */
return SDL_WriteToDataQueue(stream->queue, resamplebuf, buflen);
return buflen ? SDL_WriteToDataQueue(stream->queue, resamplebuf, buflen) : 0;
}
void