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resampler: Add a function for comparing sample format precision

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This commit is contained in:
poljar (Damir Jelić) 2013-06-28 17:58:22 +02:00
parent 7665f60cc0
commit 2bed8cda25
1 changed files with 49 additions and 8 deletions
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57
src/pulsecore/resampler.c
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@ -244,6 +244,53 @@ static pa_resample_method_t pa_resampler_fix_method(
return method;
}
/* Return true if a is a more precise sample format than b, else return false */
static bool sample_format_more_precise(pa_sample_format_t a, pa_sample_format_t b) {
pa_assert(a >= 0 && a < PA_SAMPLE_MAX);
pa_assert(b >= 0 && b < PA_SAMPLE_MAX);
switch (a) {
case PA_SAMPLE_U8:
case PA_SAMPLE_ALAW:
case PA_SAMPLE_ULAW:
return false;
break;
case PA_SAMPLE_S16LE:
case PA_SAMPLE_S16BE:
if (b == PA_SAMPLE_ULAW || b == PA_SAMPLE_ALAW || b == PA_SAMPLE_U8)
return true;
else
return false;
break;
case PA_SAMPLE_S24LE:
case PA_SAMPLE_S24BE:
case PA_SAMPLE_S24_32LE:
case PA_SAMPLE_S24_32BE:
if (b == PA_SAMPLE_ULAW || b == PA_SAMPLE_ALAW || b == PA_SAMPLE_U8 ||
b == PA_SAMPLE_S16LE || b == PA_SAMPLE_S16BE)
return true;
else
return false;
break;
case PA_SAMPLE_FLOAT32LE:
case PA_SAMPLE_FLOAT32BE:
case PA_SAMPLE_S32LE:
case PA_SAMPLE_S32BE:
if (b == PA_SAMPLE_FLOAT32LE || b == PA_SAMPLE_FLOAT32BE ||
b == PA_SAMPLE_S32LE || b == PA_SAMPLE_FLOAT32BE)
return false;
else
return true;
break;
default:
return false;
}
}
static pa_sample_format_t pa_resampler_choose_work_format(
pa_resample_method_t method,
pa_sample_format_t a,
@ -279,14 +326,8 @@ static pa_sample_format_t pa_resampler_choose_work_format(
case PA_RESAMPLER_PEAKS:
if (a == PA_SAMPLE_S16NE || b == PA_SAMPLE_S16NE)
work_format = PA_SAMPLE_S16NE;
else if (a == PA_SAMPLE_S32NE || a == PA_SAMPLE_S32RE ||
a == PA_SAMPLE_FLOAT32NE || a == PA_SAMPLE_FLOAT32RE ||
a == PA_SAMPLE_S24NE || a == PA_SAMPLE_S24RE ||
a == PA_SAMPLE_S24_32NE || a == PA_SAMPLE_S24_32RE ||
b == PA_SAMPLE_S32NE || b == PA_SAMPLE_S32RE ||
b == PA_SAMPLE_FLOAT32NE || b == PA_SAMPLE_FLOAT32RE ||
b == PA_SAMPLE_S24NE || b == PA_SAMPLE_S24RE ||
b == PA_SAMPLE_S24_32NE || b == PA_SAMPLE_S24_32RE)
else if (sample_format_more_precise(a, PA_SAMPLE_S16NE) ||
sample_format_more_precise(b, PA_SAMPLE_S16NE))
work_format = PA_SAMPLE_FLOAT32NE;
else
work_format = PA_SAMPLE_S16NE;