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Pitch Detector: group note related data together

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22758 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Alexander Levin 2009-09-20 17:03:30 +00:00
parent ab563da175
commit 8163ddeb7e
1 changed files with 28 additions and 41 deletions
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69
apps/plugins/pitch_detector.c
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@ -258,37 +258,29 @@ audio_sample_type audio_data[BUFFER_SIZE];
fixed yin_buffer[YIN_BUFFER_SIZE];
static int recording=0;
/* Frequencies of all the notes of the scale */
static const fixed freqs[12] =
/* Description of a note of scale */
struct note_entry
{
float2fixed(440.0f), /* A */
float2fixed(466.1637615f), /* A# */
float2fixed(493.8833013f), /* etc... */
float2fixed(523.2511306f),
float2fixed(554.3652620f),
float2fixed(587.3295358f),
float2fixed(622.2539674f),
float2fixed(659.2551138f),
float2fixed(698.4564629f),
float2fixed(739.9888454f),
float2fixed(783.9908720f),
float2fixed(830.6093952f),
const char *name; /* Name of the note, e.g. "A#" */
const fixed freq; /* Note frequency */
const fixed logfreq; /* log2(frequency) */
};
/* logarithm of all the notes of the scale */
static const fixed lfreqs[12] =
/* Notes within one (reference) scale */
static const struct note_entry notes[] =
{
float2fixed(8.781359714f),
float2fixed(8.864693047f),
float2fixed(8.948026380f),
float2fixed(9.031359714f),
float2fixed(9.114693047f),
float2fixed(9.198026380f),
float2fixed(9.281359714f),
float2fixed(9.364693047f),
float2fixed(9.448026380f),
float2fixed(9.531359714f),
float2fixed(9.614693047f),
float2fixed(9.698026380f),
{"A" , float2fixed(440.0000000f), float2fixed(8.781359714f)},
{"A#", float2fixed(466.1637615f), float2fixed(8.864693047f)},
{"B" , float2fixed(493.8833013f), float2fixed(8.948026380f)},
{"C" , float2fixed(523.2511306f), float2fixed(9.031359714f)},
{"C#", float2fixed(554.3652620f), float2fixed(9.114693047f)},
{"D" , float2fixed(587.3295358f), float2fixed(9.198026380f)},
{"D#", float2fixed(622.2539674f), float2fixed(9.281359714f)},
{"E" , float2fixed(659.2551138f), float2fixed(9.364693047f)},
{"F" , float2fixed(698.4564629f), float2fixed(9.448026380f)},
{"F#", float2fixed(739.9888454f), float2fixed(9.531359714f)},
{"G" , float2fixed(783.9908720f), float2fixed(9.614693047f)},
{"G#", float2fixed(830.6093952f), float2fixed(9.698026380f)},
};
/* GUI */
@ -297,12 +289,7 @@ static int font_w,font_h;
static int bar_x_0;
static int lbl_x_minus_50, lbl_x_minus_20, lbl_x_0, lbl_x_20, lbl_x_50;
static const char *english_notes[] = {"A","A#","B","C","C#","D","D#","E",
"F","F#","G","G#"};
static const char **notes = english_notes;
/*Settings for the plugin */
/* Settings for the plugin */
struct tuner_settings
{
unsigned volume_threshold;
@ -747,23 +734,23 @@ void display_frequency (fixed freq)
/* This calculates a log freq offset for note A */
/* Get the frequency to within the range of our reference table, */
/* i.e. into the right octave. */
while (fp_lt(lfreq, fp_sub(lfreqs[0], fp_shr(LOG_D_NOTE, 1))))
while (fp_lt(lfreq, fp_sub(notes[0].logfreq, fp_shr(LOG_D_NOTE, 1))))
lfreq = fp_add(lfreq, LOG_2);
while (fp_gte(lfreq, fp_sub(fp_add(lfreqs[0], LOG_2),
while (fp_gte(lfreq, fp_sub(fp_add(notes[0].logfreq, LOG_2),
fp_shr(LOG_D_NOTE, 1))))
lfreq = fp_sub(lfreq, LOG_2);
mldf = LOG_D_NOTE;
for (i=0; i<12; i++)
{
ldf = fp_gt(fp_sub(lfreq,lfreqs[i]), FP_ZERO) ?
fp_sub(lfreq,lfreqs[i]) : fp_neg(fp_sub(lfreq,lfreqs[i]));
ldf = fp_gt(fp_sub(lfreq,notes[i].logfreq), FP_ZERO) ?
fp_sub(lfreq,notes[i].logfreq) : fp_neg(fp_sub(lfreq,notes[i].logfreq));
if (fp_lt(ldf, mldf))
{
mldf = ldf;
note = i;
}
}
nfreq = freqs[note];
nfreq = notes[note].freq;
while (fp_gt(fp_div(nfreq, freq), D_NOTE_SQRT))
nfreq = fp_shr(nfreq, 1);
while (fp_gt(fp_div(freq, nfreq), D_NOTE_SQRT))
@ -777,11 +764,11 @@ void display_frequency (fixed freq)
draw_bar(ldf); /* The red bar */
if(fp_round(freq) != 0)
{
draw_note(notes[note]);
draw_note(notes[note].name);
if(tuner_settings.display_hz)
{
rb->snprintf(str_buf,30, "%s : %d cents (%d.%02dHz)",
notes[note], fp_round(ldf) ,fixed2int(orig_freq),
notes[note].name, fp_round(ldf) ,fixed2int(orig_freq),
fp_round(fp_mul(fp_frac(orig_freq),
int2fixed(DISPLAY_HZ_PRECISION))));
print_str(str_buf);