NPC mouth issue

[BlackShadow]

NPC's doesn't move their mouth when high quality sound file used.

[LAGonauta]

Would it be possible to upload a sample for testing?

[BlackShadow]

There you go:

https://streamable.com/mn2gv2

If you don't use Half-Life's standard Mono WAV files, this happens

[hzqst]

First of all,

This is because vannila GoldSrc handles mouth movement in S_MixChannelsToPaintbuffer (basically where GoldSrc paint raw wave data into paintbuffer and finally transfer them into DirectSound output driver) and call SND_MoveMouth while voicing.

However MetaAudio never paints or mix sound channel by itself (it is all done by Alure software driver) so nothing goes into S_MixChannelsToPaintbuffer.

void S_MixChannelsToPaintbuffer(...){
//...
if (ch->entchannel == CHAN_STREAM || ch->entchannel == CHAN_VOICE)
							SND_MoveMouth(ch, sc, count);
//...
}

And modify mouth controller for current entity according to the voice volume.

void SND_MoveMouth(channel_t *ch, sfxcache_t *sc, int count)
{
	int data;
	signed char *pdata;
	int i;
	int savg;
	int scount;
	cl_entity_t *pent;

	pdata = (signed char *)sc->data + ch->pos;
	i = 0;
	scount = cl_entities[ch->entnum].mouth.sndcount;
	savg = 0;
	pent = &cl_entities[ch->entnum];

	while (i < count && scount < CAVGSAMPLES)
	{
		data = pdata[i];
		savg += abs(data);

		i += 80 + ((byte)data & 0x1F);
		scount++;
	}

	pent->mouth.sndavg += savg;
	pent->mouth.sndcount = (byte)scount;

	if (pent->mouth.sndcount >= CAVGSAMPLES)
	{
		pent->mouth.mouthopen = pent->mouth.sndavg / CAVGSAMPLES;
		pent->mouth.sndavg = 0;
		pent->mouth.sndcount = 0;
	}
}

How to fix :

We can iterate every stream/voice channel in channel_manager and simulate the SND_MoveMouth with volume from Alure driver instead of stupid raw bytes calculation i += 80 + ((byte)data & 0x1F);