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Audio: add master volume (listener AL_GAIN); default 0.6, BT_AUDIO_VOLUME override (task #50)

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The raw AWE32 samples are hot and everything plays at full per-source gain, so the
mix was loud.  Set alListenerf(AL_GAIN) once at device init -- it scales EVERY
source (master volume).  Default 0.6; override with BT_AUDIO_VOLUME=<0.0..1.0+>
(0 = mute, 1 = full, >1 = boost).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-15 22:18:21 -05:00
co-authored by Claude Opus 4.8
parent c27af4800b
commit 01261d72f3
1 changed files with 6 additions and 1 deletions
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engine/MUNGA_L4/L4AUDRND.cpp
+6 -1
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@@ -382,7 +382,12 @@ void
{
ALCcontext *context = alcCreateContext(device,NULL);
alcMakeContextCurrent(context);
if (getenv("BT_AUDIO_LOG")) DEBUG_STREAM << "[audio] OpenAL device OPENED + context current\n" << std::flush;
// Master volume: AL_GAIN on the listener scales EVERY source. Default 0.6
// (the raw samples are hot); override with BT_AUDIO_VOLUME=<0.0..1.0+>.
float masterVol = 0.6f;
if (const char *v = getenv("BT_AUDIO_VOLUME")) { float f = (float)atof(v); if (f >= 0.0f) masterVol = f; }
alListenerf(AL_GAIN, masterVol);
if (getenv("BT_AUDIO_LOG")) DEBUG_STREAM << "[audio] OpenAL device OPENED + context current; master gain=" << masterVol << "\n" << std::flush;
}
else
{