forked from len0rd/rockbox
Added Coldfire ASM optimised crossfeed function. Have not measured speed improvement, but it is faster. Also moved activation check for crossfeed out of function to avoid a function call if it's not activated.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7891 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thom Johansen
parent
4202df0549
commit
df37db99ce
1 changed files with 141 additions and 64 deletions
87
apps/dsp.c
87
apps/dsp.c
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@ -169,7 +169,7 @@ struct crossfeed_data
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static struct dsp_config dsp_conf[2] IBSS_ATTR;
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static struct dither_data dither_data[2] IBSS_ATTR;
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static struct resample_data resample_data[2][2] IBSS_ATTR;
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static struct crossfeed_data crossfeed_data IBSS_ATTR;
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struct crossfeed_data crossfeed_data IBSS_ATTR;
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extern int current_codec;
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struct dsp_config *dsp;
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@ -446,11 +446,88 @@ static long dither_sample(long sample, long bias, long mask,
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* the src array if gain was applied.
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* Note that this must be called before the resampler.
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*/
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#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
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static const long crossfeed_coefs[6] ICONST_ATTR = {
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LOW, LOW_COMP, HIGH_NEG, HIGH_COMP, ATT, ATT_COMP
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};
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static void apply_crossfeed(long* src[], int count)
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{
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asm volatile (
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"lea.l crossfeed_data, %%a1 \n"
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"lea.l (16, %%a1), %%a0 \n"
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"movem.l (%%a1), %%d0-%%d3 \n"
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"move.l (120, %%a1), %%d4 \n"
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/* fetch left, right, LOW and LOW_COMP for first iteration */
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"move.l (%[src0]), %%d5 \n"
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"move.l (%[src1]), %%d6 \n"
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"move.l (%[coef])+, %%a1 \n"
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"move.l (%[coef])+, %%a2 \n"
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/* Register usage in loop:
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* a0 = &delay[0][0], a1 & a2 = coefs
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* d0 = low_left, d1 = low_right,
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* d2 = high_left, d3 = high_right,
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* d4 = delay line index,
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* d5 = src[0][i], d6 = src[1][i].
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* The rest are described in asm constraint list.
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*/
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".cfloop:"
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/* LOW*low_left + LOW_COMP*left */
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"mac.l %%a1, %%d0, %%acc0 \n"
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"mac.l %%a2, %%d5, %%acc0 \n"
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/* LOW*low_right + LOW_COMP*right */
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"mac.l %%a1, %%d1, (%[coef])+, %%a1, %%acc1 \n" /* a1 = HIGH_NEG */
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"mac.l %%a2, %%d6, (%[coef])+, %%a2, %%acc1 \n" /* a2 = HIGH_COMP */
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"movclr.l %%acc0, %%d0 \n" /* get low_left */
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"movclr.l %%acc1, %%d1 \n" /* get low_right */
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/* HIGH_NEG*high_left + HIGH_COMP*left */
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"mac.l %%a1, %%d2, %%acc0 \n"
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"mac.l %%a2, %%d5, %%acc0 \n"
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/* HIGH_NEG*hifh_right + HIGH_COMP+*right */
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"mac.l %%a1, %%d3, (%[coef])+, %%a1, %%acc1 \n" /* a1 = ATT */
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"mac.l %%a2, %%d6, (%[coef])+, %%a2, %%acc1 \n" /* a2 = ATT_COMP */
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"lea.l (-6*4, %[coef]), %[coef] \n" /* coef = &coefs[0] */
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"move.l (%%a0, %%d4*4), %%a3 \n" /* a3=delay[0][idx] */
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"move.l (52, %%a0, %%d4*4), %%d5 \n" /* d5=delay[1][idx] */
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"movclr.l %%acc0, %%d2 \n" /* get high_left */
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"movclr.l %%acc1, %%d3 \n" /* get high_right */
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/* ATT*delay_r + ATT_COMP*high_left */
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"mac.l %%a1, %%d5, (4, %[src0]), %%d5, %%acc0\n" /* d5 = src[0][i+1] */
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"mac.l %%a2, %%d2, (4, %[src1]), %%d6, %%acc0\n" /* d6 = src[1][i+1] */
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/* ATT*delay_l + ATT_COMP*high_right */
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"mac.l %%a1, %%a3, (%[coef])+, %%a1, %%acc1 \n" /* a1 = LOW */
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"mac.l %%a2, %%d3, (%[coef])+, %%a2, %%acc1 \n" /* a2 = LOW_COMP */
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if (dsp->crossfeed_enabled && src[0] != src[1])
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{
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/* save crossfed samples to output */
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"movclr.l %%acc0, %%a3 \n"
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"move.l %%a3, (%[src0])+ \n" /* src[0][i++] = out_l */
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"movclr.l %%acc1, %%a3 \n"
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"move.l %%a3, (%[src1])+ \n" /* src[1][i++] = out_r */
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"move.l %%d0, (%%a0, %%d4*4) \n" /* delay[0][index] = low_left */
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"move.l %%d1, (52, %%a0, %%d4*4)\n" /* delay[1][index] = low_right */
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"addq.l #1, %%d4 \n" /* index++ */
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"cmp.l #13, %%d4 \n" /* if (index >= 13) { */
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"jlt .nowrap \n"
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"clr.l %%d4 \n" /* index = 0 */
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".nowrap: \n" /* } */
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"subq.l #1, %[count] \n"
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"jne .cfloop \n"
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/* save data back to struct */
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"lea.l crossfeed_data, %%a1 \n"
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"movem.l %%d0-%%d3, (%%a1) \n"
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"move.l %%d4, (120, %%a1) \n"
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/* NOTE: We _just_ have enough registers for our use here, clobber just
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one more and GCC will fail. */
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:
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: [count] "d" (count),
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[src0] "a" (src[0]), [src1] "a" (src[1]), [coef] "a" (crossfeed_coefs)
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: "d0", "d1", "d2", "d3", "d4", "d5", "d6",
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"a0", "a1", "a2", "a3"
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);
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}
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#else
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static void apply_crossfeed(long* src[], int count)
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{
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long a; /* accumulator */
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long low_left = crossfeed_data.lowpass[0];
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@ -508,9 +585,8 @@ static void apply_crossfeed(long* src[], int count)
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crossfeed_data.lowpass[1] = low_right;
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crossfeed_data.highpass[0] = high_left;
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crossfeed_data.highpass[1] = high_right;
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}
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}
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#endif
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/* Apply a constant gain to the samples (e.g., for ReplayGain). May update
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* the src array if gain was applied.
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@ -615,6 +691,7 @@ long dsp_process(char* dst, char* src[], long size)
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size -= samples;
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apply_gain(tmp, samples);
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samples = resample(tmp, samples);
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if (dsp->crossfeed_enabled && dsp->stereo_mode != STEREO_MONO)
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apply_crossfeed(tmp, samples);
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write_samples((short*) dst, tmp, samples);
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written += samples;
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