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Committed: r10800 Estimate current sound sample volume for each channel, use it to set subtitles alpha. The average sample magnitude was easy to track: I simply use streamed sample data at the moment when it is pushed into OpenAL. It goes there in blocks of 4096 samples (44100 samples per second). I compute maximum magnitude in a block, and maintain "exponential moving average" over these values. There are three tdm_subtitles_volumeXyz cvars which affect how the raw volume is used. The idea is that: alpha = 0 at volume <= Min alpha = 1 at volume >= Max alpha grows logarithmically in-between Also now I hide subtitles for sounds with volume < Min. Typically volume fluctuates about 11 times per second, so if it is near Min, then subtitles can start blinking. To reduce this issue a bit, I hide a currently displayed subtitle only if its volume falls below MinDisappear. The default values are: 0.001 = tdm_subtitles_volumeMinDisappear 0.003 = tdm_subtitles_volumeMin 0.1 = tdm_subtitles_volumeMax Feels good to me =) |
- Anonymous
