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add native dsd support #1078

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8d14297
add native dsd support
Dec 15, 2025
2b027ec
remove dsd structs and from impl
Dec 20, 2025
2638bbb
revert start_threshold change for dsd as not needed
Dec 20, 2025
7f3276b
fix fmt
Dec 20, 2025
d971024
add dsd512 and dsd1024 sample rates
Dec 22, 2025
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19 changes: 18 additions & 1 deletion src/host/alsa/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -482,7 +482,7 @@ impl Device {
// Test both LE and BE formats to detect what the hardware actually supports.
// LE is listed first as it's the common case for most audio hardware.
// Hardware reports its supported formats regardless of CPU endianness.
const FORMATS: [(SampleFormat, alsa::pcm::Format); 18] = [
const FORMATS: [(SampleFormat, alsa::pcm::Format); 23] = [
(SampleFormat::I8, alsa::pcm::Format::S8),
(SampleFormat::U8, alsa::pcm::Format::U8),
(SampleFormat::I16, alsa::pcm::Format::S16LE),
Expand All @@ -501,6 +501,11 @@ impl Device {
(SampleFormat::F32, alsa::pcm::Format::FloatBE),
(SampleFormat::F64, alsa::pcm::Format::Float64LE),
(SampleFormat::F64, alsa::pcm::Format::Float64BE),
(SampleFormat::DsdU8, alsa::pcm::Format::DSDU8),
(SampleFormat::DsdU16, alsa::pcm::Format::DSDU16LE),
(SampleFormat::DsdU16, alsa::pcm::Format::DSDU16BE),
(SampleFormat::DsdU32, alsa::pcm::Format::DSDU32LE),
(SampleFormat::DsdU32, alsa::pcm::Format::DSDU32BE),
//SND_PCM_FORMAT_IEC958_SUBFRAME_LE,
//SND_PCM_FORMAT_IEC958_SUBFRAME_BE,
//SND_PCM_FORMAT_MU_LAW,
Expand Down Expand Up @@ -1284,6 +1289,9 @@ fn fill_with_equilibrium(buffer: &mut [u8], sample_format: SampleFormat) {
SampleFormat::U64 => fill_typed!(u64),
SampleFormat::F32 => fill_typed!(f32),
SampleFormat::F64 => fill_typed!(f64),
SampleFormat::DsdU8 => fill_typed!(u8),
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@roderickvd roderickvd Dec 17, 2025

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This should probably be fill_typed!(DsdU8)

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@ljufa ljufa Dec 20, 2025

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now when I removed structs I am not sure what to use here. any suggestion?

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@roderickvd roderickvd Dec 27, 2025

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Something like this?

const DSD_SILENCE_BYTE: u8 = 0x69;

SampleFormat::DsdU8 | SampleFormat::DsdU16 | SampleFormat::DsdU32 => buffer.fill(DSD_SILENCE_BYTE),

SampleFormat::DsdU16 => fill_typed!(u16),
SampleFormat::DsdU32 => fill_typed!(u32),
}
}

Expand Down Expand Up @@ -1350,6 +1358,15 @@ fn sample_format_to_alsa_format(
SampleFormat::F64 => (Format::Float64LE, Format::Float64BE),
#[cfg(target_endian = "big")]
SampleFormat::F64 => (Format::Float64BE, Format::Float64LE),
SampleFormat::DsdU8 => return Ok(Format::DSDU8),
#[cfg(target_endian = "little")]
SampleFormat::DsdU16 => (Format::DSDU16LE, Format::DSDU16BE),
#[cfg(target_endian = "big")]
SampleFormat::DsdU16 => (Format::DSDU16BE, Format::DSDU16LE),
#[cfg(target_endian = "little")]
SampleFormat::DsdU32 => (Format::DSDU32LE, Format::DSDU32BE),
#[cfg(target_endian = "big")]
SampleFormat::DsdU32 => (Format::DSDU32BE, Format::DSDU32LE),
_ => {
return Err(BackendSpecificError {
description: format!("Sample format '{sample_format}' is not supported"),
Expand Down
2 changes: 1 addition & 1 deletion src/lib.rs
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Expand Up @@ -1000,7 +1000,7 @@ impl From<SupportedStreamConfig> for StreamConfig {
#[allow(dead_code)]
pub(crate) const COMMON_SAMPLE_RATES: &[SampleRate] = &[
5512, 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000,
176400, 192000, 352800, 384000,
176400, 192000, 352800, 384000, 705600, 768000, 1411200, 1536000,
];

#[test]
Expand Down
21 changes: 21 additions & 0 deletions src/samples_formats.rs
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Expand Up @@ -105,6 +105,15 @@ pub enum SampleFormat {

/// `f64` with a valid range of `-1.0..=1.0` with `0.0` being the origin.
F64,

/// DSD stream (U8)
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@roderickvd roderickvd Dec 27, 2025

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For consistency I suggest /// DSD 1-bit stream in u8 container (8 samples per byte) with 0x69 being the silence pattern.

DsdU8,

/// DSD stream (U16)
DsdU16,

/// DSD stream (U32)
DsdU32,
}

impl SampleFormat {
Expand All @@ -129,6 +138,9 @@ impl SampleFormat {
SampleFormat::U64 => mem::size_of::<u64>(),
SampleFormat::F32 => mem::size_of::<f32>(),
SampleFormat::F64 => mem::size_of::<f64>(),
SampleFormat::DsdU8 => mem::size_of::<u8>(),
SampleFormat::DsdU16 => mem::size_of::<u16>(),
SampleFormat::DsdU32 => mem::size_of::<u32>(),
}
}

Expand All @@ -153,6 +165,9 @@ impl SampleFormat {
SampleFormat::U64 => u64::BITS,
SampleFormat::F32 => 32,
SampleFormat::F64 => 64,
SampleFormat::DsdU8 => 1,
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@roderickvd roderickvd Dec 27, 2025

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As a matter of style we could reduce this to SampleFormat::DsdU8 | SampleFormat::DsdU16 | SampleFormat::DsdU32 => 1.

SampleFormat::DsdU16 => 1,
SampleFormat::DsdU32 => 1,
}
}

Expand Down Expand Up @@ -181,6 +196,9 @@ impl SampleFormat {
| SampleFormat::U32
// | SampleFormat::U48
| SampleFormat::U64
| SampleFormat::DsdU8
| SampleFormat::DsdU16
| SampleFormat::DsdU32
)
}

Expand Down Expand Up @@ -208,6 +226,9 @@ impl Display for SampleFormat {
SampleFormat::U64 => "u64",
SampleFormat::F32 => "f32",
SampleFormat::F64 => "f64",
SampleFormat::DsdU8 => "DsdU8",
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@roderickvd roderickvd Dec 27, 2025

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For consistency, change into lowercase dsdu8.

SampleFormat::DsdU16 => "DsdU16",
SampleFormat::DsdU32 => "DsdU32",
}
.fmt(f)
}
Expand Down