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midi: make the patch sample data pointer a *int16_t to get rid of some ugly casting and drop an acessor macro to make caching the pointer in the synthVoice loop possible. Speeds up midi by 1-2% on cf and 3-5% on PP.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30438 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2011-09-06 10:34:20 +00:00
parent 2ac668e44c
commit 2afc175a4e
5 changed files with 12 additions and 13 deletions
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13
apps/plugins/midi/synth.c
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@ -201,8 +201,6 @@ int initSynth(struct MIDIfile * mf, char * filename, char * drumConfig)
return 0;
}
#define getSample(s,wf) ((short *)(wf)->data)[s]
void setPoint(struct SynthObject * so, int pt) ICODE_ATTR;
void setPoint(struct SynthObject * so, int pt)
{
@ -269,6 +267,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
register unsigned int cp_temp = so->cp;
wf = so->wf;
const int16_t *sample_data = wf->data;
const unsigned int pan = chPan[so->ch];
const int volscale = so->volscale;
@ -309,7 +308,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
cp_temp += so->delta;
}
s2 = getSample((cp_temp >> FRACTSIZE)+1, wf);
s2 = sample_data[(cp_temp >> FRACTSIZE)+1];
if(LIKELY(mode_mask28))
{
@ -319,7 +318,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
if(UNLIKELY(mode_mask_looprev))
{
cp_temp += diff_loop;
s2=getSample((cp_temp >> FRACTSIZE), wf);
s2 = sample_data[cp_temp >> FRACTSIZE];
}
else
{
@ -333,7 +332,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
if(UNLIKELY(!mode_mask24))
{
cp_temp -= diff_loop;
s2=getSample((cp_temp >> FRACTSIZE), wf);
s2 = sample_data[cp_temp >> FRACTSIZE];
}
else
{
@ -346,7 +345,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
if(UNLIKELY(cp_temp >= num_samples))
{
cp_temp -= so->delta;
s2 = getSample((cp_temp >> FRACTSIZE)+1, wf);
s2 = sample_data[(cp_temp >> FRACTSIZE)+1];
if (!rampdown) /* stop voice */
{
@ -356,7 +355,7 @@ static inline void synthVoice(struct SynthObject * so, int32_t * out, unsigned i
}
/* Better, working, linear interpolation */
s1=getSample((cp_temp >> FRACTSIZE), wf);
s1 = sample_data[cp_temp >> FRACTSIZE];
s1 +=((signed)((s2 - s1) * (cp_temp & ((1<<FRACTSIZE)-1)))>>FRACTSIZE);