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Fix excessive stack usage when calling vorbis_analysis_wrote with lots of samples #104

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Fix excessive stack usage when calling vorbis_analysis_wrote with lots of samples #104

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1 change: 1 addition & 0 deletions include/vorbis/codec.h
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@ typedef struct vorbis_dsp_state{

float **pcm;
float **pcmret;
float *preextrapolate_work;
int pcm_storage;
int pcm_current;
int pcm_returned;
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12 changes: 10 additions & 2 deletions lib/block.c
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,7 @@ void vorbis_dsp_clear(vorbis_dsp_state *v){
if(v->pcm[i])_ogg_free(v->pcm[i]);
_ogg_free(v->pcm);
if(v->pcmret)_ogg_free(v->pcmret);
if(v->preextrapolate_work)_ogg_free(v->preextrapolate_work);
}

if(b){
Expand Down Expand Up @@ -417,11 +418,18 @@ static void _preextrapolate_helper(vorbis_dsp_state *v){
int i;
int order=16;
float *lpc=alloca(order*sizeof(*lpc));
float *work=alloca(v->pcm_current*sizeof(*work));
float *work;
int workbuf=v->pcm_current*sizeof(*work);
long j;
v->preextrapolate=1;

if(v->pcm_current-v->centerW>order*2){ /* safety */
if(workbuf<256*1024)
work=alloca(workbuf);
else
/* workbuf is too big to safely allocate on the stack */
work=v->preextrapolate_work=_ogg_realloc(v->preextrapolate_work,workbuf);

if(v->pcm_current-v->centerW>order*2 && work){ /* safety */
for(i=0;i<v->vi->channels;i++){
/* need to run the extrapolation in reverse! */
for(j=0;j<v->pcm_current;j++)
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