avioflow (Python)

Python bindings for AvioFlow, a high-performance audio library built on FFmpeg.

The package wraps the same C++ core as the Node.js, Java, Rust and WebAssembly bindings, through a pybind11 extension. FFmpeg ships inside the wheel, so there is nothing to install or locate at runtime.

Install

pip install avioflow

Wheels are published for CPython 3.8 through 3.14 on Linux (x86_64, aarch64), macOS (x86_64, arm64) and Windows (x64, arm64).

Conventions

Samples are NumPy arrays shaped (channels, samples), dtype float32. Channel 0 is the first channel: samples[0] is a 1-D array of one channel.
Failures raise exceptions. A source that cannot be opened or decoded raises RuntimeError; a rejected argument raises ValueError.
Unset options preserve the source format. Passing None or -1 for a rate or channel count keeps whatever the input has.

Quick start

import avioflow

# Metadata only, no decoding
meta = avioflow.info("audio.mp3")
print(f"{meta.duration:.1f}s, {meta.sample_rate} Hz, {meta.num_channels} ch")

# Metadata plus all samples, in one call
meta, samples = avioflow.load("audio.mp3", output_sample_rate=16000)
print(samples.shape)  # (channels, samples)

Module functions

Function	Returns	Description
`info(source)`	`Metadata`	Read metadata without decoding.
`load(source, output_sample_rate=None, output_num_channels=None)`	`(Metadata, ndarray)`	Open and decode everything in one call.
`save(path, samples, options=None)`	`None`	Write samples to a file.
`resample(samples, input_sample_rate, output_sample_rate, output_num_channels=None)`	`ndarray`	Resample a complete buffer.
`set_log_level(level)`	`None`	FFmpeg verbosity.
`get_supported_decoders()`	`list[str]`	Available decoders, e.g. `"mp3"`.
`get_supported_encoders()`	`list[str]`	Available encoders, e.g. `"pcm_s16le"`.
`get_supported_input_formats()`	`list[str]`	Available demuxers.
`get_supported_output_formats()`	`list[str]`	Available muxers.
`DeviceManager.list_audio_devices()`	`list[DeviceInfo]`	Enumerate audio devices.

source accepts a path, a pathlib.Path, a URL, a device identifier, or encoded audio as bytes, bytearray, memoryview or io.BytesIO.

Decoding

`AudioDecoder`

decoder = avioflow.AudioDecoder(
    output_sample_rate=16000,   # resample; omit to keep the source rate
    output_num_channels=1,      # remix; omit to keep the source channels
    input_format="s16le",       # required for streaming
    input_sample_rate=48000,    # required for raw PCM streaming
    input_channels=2,           # required for raw PCM streaming
)

Method	Returns	Description
`load_file(source)`	`Metadata`	Open a path, URL or device.
`load_buffer(source)`	`Metadata`	Open complete file bytes in memory.
`feed(data)`	`None`	Push encoded bytes for streaming decode.
`flush()`	`None`	Mark streaming input complete.
`get_samples(start_seconds=0.0, stop_seconds=None)`	`ndarray`	Decode `[start, stop)` in seconds.
`get_frame()`	`ndarray \| None`	Decode one frame; `None` at end of stream.
`is_finished()`	`bool`	Whether the stream is exhausted.
`get_metadata()`	`Metadata`	Current stream metadata.

Offline decoding

decoder = avioflow.AudioDecoder(output_sample_rate=16000)
meta = decoder.load_file("audio.mp3")
samples = decoder.get_samples()

print(f"{samples.shape[0]} channels x {samples.shape[1]} samples")

load_file reports the source stream. The resampler is not configured until the first frame is decoded, so when output_sample_rate is set the new rate appears in get_metadata() after decoding rather than in the value load_file returns.

Time-range decoding

decoder = avioflow.AudioDecoder()
decoder.load_file("audio.mp3")

# Seconds 10.3 through 20.3, exclusive of the end
window = decoder.get_samples(10.3, 20.3)

# From 30s to the end
tail = decoder.get_samples(30.0)

Each call seeks independently, so one decoder can serve many ranges. Range decoding requires offline mode; in stream mode get_samples() drains whatever is currently buffered and the range arguments do not apply.

Frame-by-frame

decoder = avioflow.AudioDecoder()
decoder.load_file("audio.mp3")

total = 0
while (frame := decoder.get_frame()) is not None:
    total += frame.shape[1]       # frame is (channels, samples)

Streaming decode

decoder = avioflow.AudioDecoder(input_format="mp3")

while chunk := stream.read(4096):
    decoder.feed(chunk)
    samples = decoder.get_samples()
    if samples.size:
        process(samples)

decoder.flush()                   # then drain the remainder
remaining = decoder.get_samples()

flush() discards nothing. It marks input complete so buffered bytes and codec-delayed frames can still be drained. For raw PCM input, also pass input_sample_rate and input_channels.

Encoding

avioflow.save("out.wav", samples, avioflow.AudioWriteOptions(
    container_format="wav",
    codec_name="pcm_s16le",
    sample_rate=16000,
))

samples is any array-like shaped (channels, samples); it is converted to float32 as needed.

`AudioWriteOptions`

Attribute	Common values
`codec_name`	`"pcm_s16le"`, `"flac"`, `"aac"`, `"libmp3lame"`, `"libopus"`
`container_format`	`"wav"`, `"flac"`, `"mp4"`, `"ogg"`, `"adts"`
`sample_format`	`"s16"`, `"s32"`, `"flt"`, `"fltp"`
`sample_rate`	8000, 16000, 44100, 48000
`num_channels`	1, 2
`bit_rate`	128000, 192000, 320000
`overwrite`	Defaults to `True`

Unset fields are inferred from the container and the input samples. A format preset is also available:

options = avioflow.AudioWriteOptions("wav", 16000, 1)   # format, rate, channels

Resampling

Two entry points: resample for a buffer held in full, AudioResampler for audio arriving in chunks. Both work on any array, not only avioflow output, so a NumPy array from another library can be resampled directly.

To resample while decoding, pass output_sample_rate to AudioDecoder instead; that avoids a second pass over the samples.

One-shot

downsampled = avioflow.resample(samples, 44100, 16000)
mono = avioflow.resample(samples, 44100, 16000, output_num_channels=1)

Chunked

import numpy as np

resampler = avioflow.AudioResampler(44100, 16000)
parts = [resampler.process(chunk) for chunk in chunks]
parts.append(resampler.flush())
out = np.concatenate([p for p in parts if p.size], axis=1)

flush() is not optional. The resampler holds back the last few milliseconds to keep filter continuity, and skipping the flush discards them. Filter state carries across process calls, so chunked output matches a one-shot conversion sample for sample — calling resample per chunk instead would introduce a discontinuity at every boundary.

output_num_channels returns 0 until the first process call reveals the input channel count. The channel count must not change between calls.

Metadata

meta = avioflow.info("audio.mp3")

Attribute	Type	Description
`duration`	`float`	Seconds; 0 for live streams.
`num_samples`	`int`	Samples per channel; updated at EOF for streams.
`sample_rate`	`int`	Hz.
`num_channels`	`int`	1 for mono, 2 for stereo.
`sample_format`	`str`	Source format, e.g. `"fltp"`.
`codec`	`str`	Decoder name, e.g. `"mp3float"`.
`bit_rate`	`int`	Bits per second.
`container`	`str`	Container format, e.g. `"mp3"`.

Note codec is the FFmpeg decoder name, so an MP3 file reports "mp3float" while container reports "mp3".

Devices and diagnostics

for dev in avioflow.DeviceManager.list_audio_devices():
    print(f"{dev.name}: {dev.description} (output={dev.is_output})")

# Open a device by passing its name as the source
decoder = avioflow.AudioDecoder()
decoder.load_file("audio=Microphone")

avioflow.set_log_level("debug")   # quiet, error, warning, info, debug, trace

Build from source

pip install ./python

Building compiles the C++ core, so the host needs a C++17 compiler and CMake 3.20 or newer. FFmpeg is fetched automatically during the CMake configure step.

Run the tests against a checkout:

python python/tests/test_offline_load.py public/wavs/TownTheme.mp3

License

MIT

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BLAKE2b-256	`ad0d2066a10da5ebae806b8ea937e370d426686fab0e8aa938133baeedd8e199`

Algorithm	Hash digest
SHA256	`b7af01ff0b7088e1203b6b80b1592dd512c70ce109f82d3a1f35066b6a08c677`
MD5	`a8662438b8f4b124acef9007a3c58ce6`
BLAKE2b-256	`8df4620827c25bfcb5fb1e702065034ffa0b74ddc9572f5b0d8becd5f6dc9e09`

Algorithm	Hash digest
SHA256	`25a0f9d750b4c09a92ac669fe1d092fec06f2cafc0220887c987325e6175136f`
MD5	`5bf692cca43cc2536f03d06da7112a26`
BLAKE2b-256	`5eb030ffc7707e6143a85f6932b4d656c9c395c025c0c02e0488268b6e8535f0`

avioflow 0.7.5

avioflow (Python)

Install

Conventions

Quick start

Module functions

Decoding

AudioDecoder

Offline decoding

Time-range decoding

Frame-by-frame

Streaming decode

Encoding

AudioWriteOptions

Resampling

One-shot

Chunked

Metadata

Devices and diagnostics

Build from source

License

Key dates

1 maintainer

Credits

License

Requires

Classifiers

Download files

Source Distributions

Built Distributions

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`AudioDecoder`

`AudioWriteOptions`

Algorithm	Hash digest
SHA256	`c65b5a3e7f04e1b7a8c72aa2998cd52c3e13574d4d116c1c07dff22fcf674af6`
MD5	`6f9af052f52c4947a727c41bf13bb46b`
BLAKE2b-256	`222b1095fdd7128509b6a0600ba504477d63fe27f308d8772622b37ed8ef9e1d`

Algorithm	Hash digest
SHA256	`060a0824842a2c3424992545982a58f3c552e31e25f8370b9864331e3f626130`
MD5	`fc1b357d6545934506103c9eec1b954a`
BLAKE2b-256	`8d397ef4b09b133f020db0aa1c7bdd2fbe932fb2f24b0afa4dcc49367a4c1744`

Algorithm	Hash digest
SHA256	`5b5833572f0f6d2ba6a8b297afb2a7a4e33e6bb9f441fb69cd7a961d54adb44c`
MD5	`709a8e7ef576217a3e5dd2b87ca92ef2`
BLAKE2b-256	`4e3eb864bb6f1bfce79e8ec142dab9945daec3eabf86cc90611437d6a9a5b6e8`

Algorithm	Hash digest
SHA256	`b17be6ec0b2879fb849a97c8b6ef7176b51092332cdcff455c4a85cb31d18132`
MD5	`f289b70fa931ea888a39021e14f52084`
BLAKE2b-256	`014cecca9b7327103d7ce81d7e89ef331618ab55b016fcb9804fd421a5ebb121`

Algorithm	Hash digest
SHA256	`ea2b7fe5aa1f36eca637d75979d976cad73d1aaa7bd25920b2a3380408cb3ed4`
MD5	`a99c886b7f1b21ee8ce5256b6124a780`
BLAKE2b-256	`a1f7a312ed196f5dd52de29fe3e4b704ddddb43d296934db3dd16d862f048664`

Algorithm	Hash digest
SHA256	`187f1d0037a26caaaf0596f9b8ab365410edc49366e61c2036ee15a3d20bc93f`
MD5	`98418da259a0db080f9a8bbe1cfe143a`
BLAKE2b-256	`bf3985eae4f9db50feec90092b64226e215830406b4033963089f4851a2f7ad9`

Algorithm	Hash digest
SHA256	`152f047f6d85225c24e5b690abda7ab72a14b62218f4f4f6fa64678ea2536d33`
MD5	`4232f31fb74bd94071063ca91ab7da11`
BLAKE2b-256	`99556b66934dfeb39bd3970e8cdd54dd052f8abb9c7671bdd3291dee503a2a47`

Algorithm	Hash digest
SHA256	`30d985336351e6a888f44f9fbdaf00dfdd00dee1f20690e012c1eff9808d56c3`
MD5	`1fdf7b9f84b26cf7c7f0f8a19560cb21`
BLAKE2b-256	`f98485b4e47daba75c1d87561092febcbd42d87d702868b5870dd2e8d2df88c8`

Algorithm	Hash digest
SHA256	`7c9d61dfc8d0857d8eeaf14bbf756a9af86ca4d05a51c5ff091eeaa5e79ed9d5`
MD5	`3843279e74de78020039b7472c5c66ba`
BLAKE2b-256	`7b42c857c52043e2cadbec0c815feeac60980c1eda8823a74228575f37521f1c`

Algorithm	Hash digest
SHA256	`8afba245e9082f80e9029fe3bf09c0e73057e4500465e1af44ae4a968eb8922f`
MD5	`b3c2976840a88cd067d1ab96a7cb2cdb`
BLAKE2b-256	`1816bb44c3d382dde7b4b5a7c223929c1273d3ef177883dc3167fb78bcf3e6b5`