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tutorial: fix s16 scale and add some docs

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The float -> s16 scale value is 32767 or 32768 with clamping. Fix this
and add some docs.

Fixes #3838
This commit is contained in:
Wim Taymans 2024-02-06 11:34:27 +01:00
parent 8657caa0ac
commit cb2b7af8fd
1 changed files with 7 additions and 1 deletions
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8
doc/examples/tutorial4.c
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@ -50,7 +50,13 @@ static void on_process(void *userdata)
if (data->accumulator >= M_PI_M2) if (data->accumulator >= M_PI_M2)
data->accumulator -= M_PI_M2; data->accumulator -= M_PI_M2;
val = sin(data->accumulator) * DEFAULT_VOLUME * 16767.f; /* sin() gives a value between -1.0 and 1.0, we first apply
* the volume and then scale with 32767.0 to get a 16 bits value
* between [-32767 32767].
* Another common method to convert a double to
* 16 bits is to multiple by 32768.0 and then clamp to
* [-32768 32767] to get the full 16 bits range. */
val = sin(data->accumulator) * DEFAULT_VOLUME * 32767.0;
for (c = 0; c < DEFAULT_CHANNELS; c++) for (c = 0; c < DEFAULT_CHANNELS; c++)
*dst++ = val; *dst++ = val;
} }