ghnotgood opened a new pull request, #3477:
URL: https://github.com/apache/nuttx-apps/pull/3477
## Summary
Add `rtttl-c`, a simple parsing library, to the `audioutils` directory.
## Impact
Developers may implement a procedure that makes sound
```
void
play_tone(struct rtttl_tone tone)
{
/* TODO */
}
```
and then play a sound encoded in the RTTTL string (`"..."` in the following)
```
rtttl_play("...", play_tone);
```
## Testing
The testing code is
```
void
print_tone(struct rtttl_tone tone)
{
_info("playing %d /100 Hz for %d us",
tone.frequency_100hz, tone.duration_us);
}
int
main(int argc, char **argv)
{
rtttl_play("Jingle
Bells:o=5,d=4,b=170,b=170:b,b,b,p,b,b,b,p,b,d6,g.,8a,2b.,8p,c6,c6,c6.,8c6,c6,b,b,8b,8b,b,a,a,b,2a,2d6",
print_tone);
return 0;
}
```
with the output of
```
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 0 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 0 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 117464 /100 Hz for 352941 us
print_tone: playing 78400 /100 Hz for 529410 us
print_tone: playing 88000 /100 Hz for 176470 us
print_tone: playing 98776 /100 Hz for 1058823 us
print_tone: playing 0 /100 Hz for 176470 us
print_tone: playing 104652 /100 Hz for 352941 us
print_tone: playing 104652 /100 Hz for 352941 us
print_tone: playing 104652 /100 Hz for 529410 us
print_tone: playing 104652 /100 Hz for 176470 us
print_tone: playing 104652 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 176470 us
print_tone: playing 98776 /100 Hz for 176470 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 88000 /100 Hz for 352941 us
print_tone: playing 88000 /100 Hz for 352941 us
print_tone: playing 98776 /100 Hz for 352941 us
print_tone: playing 88000 /100 Hz for 705882 us
print_tone: playing 117464 /100 Hz for 705882 us
```
When instead of `print_tone`, there is a `play_tone` procedure with the
board-specific code to make the sound, the Jingle Bells song is played.
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