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Put everything together.

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This commit is contained in:
laurent
2023-07-05 12:19:21 +01:00
parent 95f378ebb4
commit 63e5a266bf
2 changed files with 17 additions and 26 deletions
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30
candle-examples/examples/whisper/audio.rs
View File

@ -1,12 +1,6 @@
// Audio processing code, adapted from whisper.cpp
// https://github.com/ggerganov/whisper.cpp
pub const WHISPER_SAMPLE_RATE: usize = 16000;
pub const WHISPER_N_FFT: usize = 400;
pub const WHISPER_N_MEL: usize = 80;
pub const WHISPER_HOP_LENGTH: usize = 160;
pub const WHISPER_CHUNK_SIZE: usize = 30;
pub trait Float: num_traits::Float + num_traits::FloatConst + num_traits::NumAssign {}
impl Float for f32 {}
@ -175,7 +169,7 @@ fn log_mel_spectrogram_<T: Float>(
let n_len = samples.len() / fft_step;
// pad audio with at least one extra chunk of zeros
let pad = 100 * WHISPER_CHUNK_SIZE / 2;
let pad = 100 * super::CHUNK_LENGTH / 2;
let n_len = if n_len % pad != 0 {
(n_len / pad + 1) * pad
} else {
@ -206,22 +200,20 @@ fn log_mel_spectrogram_<T: Float>(
mel
}
pub fn pcm_to_mel<T: Float>(samples: &[T], filters: &[T]) -> anyhow::Result<Vec<T>> {
if filters.len() != WHISPER_N_MEL * WHISPER_N_FFT {
pub fn pcm_to_mel<T: Float>(
samples: &[T],
filters: &[T],
n_mel: usize,
n_fft: usize,
) -> anyhow::Result<Vec<T>> {
if filters.len() != n_mel * n_fft {
anyhow::bail!(
"unexpected filter length {} (n_mel: {}, n_fft: {})",
filters.len(),
WHISPER_N_MEL,
WHISPER_N_FFT
n_mel,
n_fft
)
}
let mel = log_mel_spectrogram_(
samples,
filters,
WHISPER_N_FFT,
WHISPER_HOP_LENGTH,
WHISPER_N_MEL,
false,
);
let mel = log_mel_spectrogram_(samples, filters, n_fft, super::HOP_LENGTH, n_mel, false);
Ok(mel)
}

13
candle-examples/examples/whisper/main.rs
View File

@ -201,24 +201,23 @@ fn main() -> Result<()> {
let mel_filters = mel_filters.deserialize()?;
let mel_filters = mel_filters.tensor("mel_80", &device)?;
println!("loaded mel filters {:?}", mel_filters.shape());
let (n_mel, n_fft) = mel_filters.shape().r2()?;
let mel_filters = mel_filters.flatten_all()?.to_vec1::<f32>()?;
let mut input = std::fs::File::open(args.input)?;
let (header, data) = wav::read(&mut input)?;
println!("loaded wav data: {header:?}");
if header.sampling_rate != audio::WHISPER_SAMPLE_RATE as u32 {
anyhow::bail!(
"wav file must have a {} sampling rate",
audio::WHISPER_SAMPLE_RATE
)
if header.sampling_rate != SAMPLE_RATE as u32 {
anyhow::bail!("wav file must have a {} sampling rate", SAMPLE_RATE)
}
let data = data.as_sixteen().expect("expected 16 bit wav file");
let pcm_data: Vec<_> = data[..data.len() / header.channel_count as usize]
.iter()
.map(|v| *v as f32 / 32768.)
.collect();
let mel = audio::pcm_to_mel(&pcm_data, &mel_filters)?;
let mel = Tensor::new(&mel[..], &device)?;
let mel = audio::pcm_to_mel(&pcm_data, &mel_filters, n_mel, n_fft)?;
let mel_len = mel.len();
let mel = Tensor::from_vec(mel, (1, n_mel, mel_len / n_mel), &device)?;
println!("loaded mel: {:?}", mel.dims());
let weights = unsafe { candle::safetensors::MmapedFile::new(args.weights)? };