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Merge pull request #953 from ericwa/sdl2-branch

Allocate large enough buffer for SDL_ConvertAudio.

--- a/src/i_sdlsound.c

+++ b/src/i_sdlsound.c

@@ -631,11 +631,15 @@

                           AUDIO_U8, 1, samplerate,

                           mixer_format, mixer_channels, mixer_freq))

     {

-        convertor.buf = chunk->abuf;

         convertor.len = length;

+        convertor.buf = malloc(convertor.len * convertor.len_mult);

+        assert(convertor.buf != NULL);

         memcpy(convertor.buf, data, length);

         SDL_ConvertAudio(&convertor);

+

+        memcpy(chunk->abuf, convertor.buf, chunk->alen);

+        free(convertor.buf);

     }

     else

     {