42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
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#ifndef _FLUID_CONV_TABLES_H
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#define _FLUID_CONV_TABLES_H
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/*
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Attenuation range in centibels.
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Attenuation range is the dynamic range of the volume envelope generator
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from 0 to the end of attack segment.
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fluidsynth is a 24 bit synth, it could (should??) be 144 dB of attenuation.
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However the spec makes no distinction between 16 or 24 bit synths, so use
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96 dB here.
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Note about usefulness of 24 bits:
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1)Even fluidsynth is a 24 bit synth, this format is only relevant if
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the sample format coming from the soundfont is 24 bits and the audio sample format
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chosen by the application (audio.sample.format) is not 16 bits.
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2)When the sample soundfont is 16 bits, the internal 24 bits number have
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16 bits msb and lsb to 0. Consequently, at the DAC output, the dynamic range of
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this 24 bit sample is reduced to the the dynamic of a 16 bits sample (ie 90 db)
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even if this sample is produced by the audio driver using an audio sample format
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compatible for a 24 bit DAC.
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3)When the audio sample format settings is 16 bits (audio.sample.format), the
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audio driver will make use of a 16 bit DAC, and the dynamic will be reduced to 96 dB
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even if the initial sample comes from a 24 bits soundfont.
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In both cases (2) or (3), the real dynamic range is only 96 dB.
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Other consideration for FLUID_NOISE_FLOOR related to case (1),(2,3):
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- for case (1), FLUID_NOISE_FLOOR should be the noise floor for 24 bits (i.e -138 dB).
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- for case (2) or (3), FLUID_NOISE_FLOOR should be the noise floor for 16 bits (i.e -90 dB).
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*/
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#define FLUID_PEAK_ATTENUATION 960.0f
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#define FLUID_CENTS_HZ_SIZE 1200
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#define FLUID_VEL_CB_SIZE 128
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#define FLUID_CB_AMP_SIZE 1441
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#define FLUID_PAN_SIZE 1002
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#endif
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