620 lines
21 KiB
Rust
620 lines
21 KiB
Rust
use crate::{FullParams, WhisperContext, WhisperError, WhisperToken, WhisperTokenData};
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use std::ffi::{c_int, CStr};
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use std::marker::PhantomData;
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/// Rustified pointer to a Whisper state.
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#[derive(Debug)]
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pub struct WhisperState<'a> {
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ctx: *mut whisper_rs_sys::whisper_context,
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ptr: *mut whisper_rs_sys::whisper_state,
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_phantom: PhantomData<&'a WhisperContext>,
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}
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unsafe impl<'a> Send for WhisperState<'a> {}
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unsafe impl<'a> Sync for WhisperState<'a> {}
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impl<'a> Drop for WhisperState<'a> {
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fn drop(&mut self) {
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unsafe {
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whisper_rs_sys::whisper_free_state(self.ptr);
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}
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}
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}
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impl<'a> WhisperState<'a> {
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pub(crate) fn new(
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ctx: *mut whisper_rs_sys::whisper_context,
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ptr: *mut whisper_rs_sys::whisper_state,
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) -> Self {
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Self {
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ctx,
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ptr,
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_phantom: PhantomData,
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}
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}
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/// Convert raw PCM audio (floating point 32 bit) to log mel spectrogram.
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/// The resulting spectrogram is stored in the context transparently.
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///
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/// # Arguments
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/// * pcm: The raw PCM audio.
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/// * threads: How many threads to use. Defaults to 1. Must be at least 1, returns an error otherwise.
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///
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/// # Returns
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/// Ok(()) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_pcm_to_mel(struct whisper_context * ctx, const float * samples, int n_samples, int n_threads)`
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pub fn pcm_to_mel(&mut self, pcm: &[f32], threads: usize) -> Result<(), WhisperError> {
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if threads < 1 {
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return Err(WhisperError::InvalidThreadCount);
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}
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let ret = unsafe {
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whisper_rs_sys::whisper_pcm_to_mel_with_state(
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self.ctx,
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self.ptr,
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pcm.as_ptr(),
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pcm.len() as c_int,
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threads as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateSpectrogram)
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} else if ret == 0 {
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Ok(())
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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/// Convert raw PCM audio (floating point 32 bit) to log mel spectrogram.
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/// Applies a Phase Vocoder to speed up the audio x2.
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/// The resulting spectrogram is stored in the context transparently.
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///
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/// # Arguments
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/// * pcm: The raw PCM audio.
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/// * threads: How many threads to use. Defaults to 1. Must be at least 1, returns an error otherwise.
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///
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/// # Returns
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/// Ok(()) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_pcm_to_mel(struct whisper_context * ctx, const float * samples, int n_samples, int n_threads)`
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pub fn pcm_to_mel_phase_vocoder(
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&mut self,
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pcm: &[f32],
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threads: usize,
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) -> Result<(), WhisperError> {
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if threads < 1 {
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return Err(WhisperError::InvalidThreadCount);
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}
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let ret = unsafe {
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whisper_rs_sys::whisper_pcm_to_mel_phase_vocoder_with_state(
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self.ctx,
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self.ptr,
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pcm.as_ptr(),
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pcm.len() as c_int,
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threads as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateSpectrogram)
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} else if ret == 0 {
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Ok(())
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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/// This can be used to set a custom log mel spectrogram inside the provided whisper state.
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/// Use this instead of whisper_pcm_to_mel() if you want to provide your own log mel spectrogram.
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///
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/// # Note
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/// This is a low-level function.
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/// If you're a typical user, you probably don't want to use this function.
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/// See instead [WhisperState::pcm_to_mel].
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///
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/// # Arguments
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/// * data: The log mel spectrogram.
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///
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/// # Returns
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/// Ok(()) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_set_mel(struct whisper_context * ctx, const float * data, int n_len, int n_mel)`
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pub fn set_mel(&mut self, data: &[f32]) -> Result<(), WhisperError> {
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let hop_size = 160;
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let n_len = (data.len() / hop_size) * 2;
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let ret = unsafe {
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whisper_rs_sys::whisper_set_mel_with_state(
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self.ctx,
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self.ptr,
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data.as_ptr(),
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n_len as c_int,
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80 as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::InvalidMelBands)
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} else if ret == 0 {
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Ok(())
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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/// Run the Whisper encoder on the log mel spectrogram stored inside the provided whisper state.
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/// Make sure to call [WhisperState::pcm_to_mel] or [WhisperState::set_mel] first.
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///
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/// # Arguments
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/// * offset: Can be used to specify the offset of the first frame in the spectrogram. Usually 0.
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/// * threads: How many threads to use. Defaults to 1. Must be at least 1, returns an error otherwise.
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///
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/// # Returns
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/// Ok(()) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_encode(struct whisper_context * ctx, int offset, int n_threads)`
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pub fn encode(&mut self, offset: usize, threads: usize) -> Result<(), WhisperError> {
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if threads < 1 {
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return Err(WhisperError::InvalidThreadCount);
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}
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let ret = unsafe {
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whisper_rs_sys::whisper_encode_with_state(
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self.ctx,
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self.ptr,
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offset as c_int,
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threads as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateEvaluation)
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} else if ret == 0 {
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Ok(())
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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/// Run the Whisper decoder to obtain the logits and probabilities for the next token.
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/// Make sure to call [WhisperState::encode] first.
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/// tokens + n_tokens is the provided context for the decoder.
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///
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/// # Arguments
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/// * tokens: The tokens to decode.
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/// * n_tokens: The number of tokens to decode.
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/// * n_past: The number of past tokens to use for the decoding.
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/// * n_threads: How many threads to use. Defaults to 1. Must be at least 1, returns an error otherwise.
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///
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/// # Returns
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/// Ok(()) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_decode(struct whisper_context * ctx, const whisper_token * tokens, int n_tokens, int n_past, int n_threads)`
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pub fn decode(
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&mut self,
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tokens: &[WhisperToken],
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n_past: usize,
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threads: usize,
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) -> Result<(), WhisperError> {
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if threads < 1 {
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return Err(WhisperError::InvalidThreadCount);
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}
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let ret = unsafe {
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whisper_rs_sys::whisper_decode_with_state(
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self.ctx,
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self.ptr,
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tokens.as_ptr(),
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tokens.len() as c_int,
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n_past as c_int,
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threads as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateEvaluation)
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} else if ret == 0 {
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Ok(())
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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// Language functions
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/// Use mel data at offset_ms to try and auto-detect the spoken language
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/// Make sure to call pcm_to_mel() or set_mel() first
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///
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/// # Arguments
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/// * offset_ms: The offset in milliseconds to use for the language detection.
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/// * n_threads: How many threads to use. Defaults to 1. Must be at least 1, returns an error otherwise.
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///
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/// # Returns
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/// `Ok(Vec<f32>)` on success, `Err(WhisperError)` on failure.
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///
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/// # C++ equivalent
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/// `int whisper_lang_auto_detect(struct whisper_context * ctx, int offset_ms, int n_threads, float * lang_probs)`
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pub fn lang_detect(&self, offset_ms: usize, threads: usize) -> Result<Vec<f32>, WhisperError> {
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if threads < 1 {
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return Err(WhisperError::InvalidThreadCount);
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}
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let mut lang_probs: Vec<f32> = vec![0.0; crate::standalone::get_lang_max_id() as usize + 1];
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let ret = unsafe {
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whisper_rs_sys::whisper_lang_auto_detect_with_state(
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self.ctx,
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self.ptr,
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offset_ms as c_int,
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threads as c_int,
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lang_probs.as_mut_ptr(),
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateEvaluation)
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} else {
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assert_eq!(
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ret as usize,
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lang_probs.len(),
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"lang_probs length mismatch: this is a bug in whisper.cpp"
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);
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// if we're still running, double check that the length is correct, otherwise print to stderr
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// and abort, as this will cause Undefined Behavior
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// might get here due to the unwind being caught by a user-installed panic handler
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if lang_probs.len() != ret as usize {
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eprintln!(
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"lang_probs length mismatch: this is a bug in whisper.cpp, \
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aborting to avoid Undefined Behavior"
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);
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std::process::abort();
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}
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Ok(lang_probs)
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}
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}
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// logit functions
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/// Gets logits obtained from the last call to [WhisperState::decode].
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/// As of whisper.cpp 1.4.1, only a single row of logits is available, corresponding to the last token in the input.
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///
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/// # Returns
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/// A slice of logits with length equal to n_vocab.
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///
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/// # C++ equivalent
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/// `float * whisper_get_logits(struct whisper_context * ctx)`
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pub fn get_logits(&self) -> Result<&[f32], WhisperError> {
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let ret = unsafe { whisper_rs_sys::whisper_get_logits_from_state(self.ptr) };
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if ret.is_null() {
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return Err(WhisperError::NullPointer);
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}
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let n_vocab = self.n_vocab();
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Ok(unsafe { std::slice::from_raw_parts(ret, n_vocab as usize) })
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}
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// model attributes
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/// Get the mel spectrogram length.
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///
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/// # Returns
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/// Ok(c_int) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_n_len_from_state(struct whisper_context * ctx)`
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#[inline]
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pub fn n_len(&self) -> Result<c_int, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_n_len_from_state(self.ptr) })
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}
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/// Get n_vocab.
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///
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/// # Returns
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/// c_int
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///
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/// # C++ equivalent
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/// `int whisper_n_vocab (struct whisper_context * ctx)`
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#[inline]
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pub fn n_vocab(&self) -> c_int {
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unsafe { whisper_rs_sys::whisper_n_vocab(self.ctx) }
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}
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/// Run the entire model: PCM -> log mel spectrogram -> encoder -> decoder -> text
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/// Uses the specified decoding strategy to obtain the text.
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///
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/// This is usually the only function you need to call as an end user.
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///
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/// # Arguments
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/// * params: [crate::FullParams] struct.
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/// * pcm: raw PCM audio data, 32 bit floating point at a sample rate of 16 kHz, 1 channel.
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/// See utilities in the root of this crate for functions to convert audio to this format.
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///
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/// # Returns
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/// Ok(c_int) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `int whisper_full(struct whisper_context * ctx, struct whisper_full_params params, const float * samples, int n_samples)`
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pub fn full(&mut self, params: FullParams, data: &[f32]) -> Result<c_int, WhisperError> {
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if data.is_empty() {
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// can randomly trigger segmentation faults if we don't check this
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return Err(WhisperError::NoSamples);
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}
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let ret = unsafe {
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whisper_rs_sys::whisper_full_with_state(
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self.ctx,
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self.ptr,
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params.fp,
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data.as_ptr(),
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data.len() as c_int,
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)
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};
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if ret == -1 {
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Err(WhisperError::UnableToCalculateSpectrogram)
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} else if ret == 7 {
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Err(WhisperError::FailedToEncode)
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} else if ret == 8 {
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Err(WhisperError::FailedToDecode)
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} else if ret == 0 {
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Ok(ret)
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} else {
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Err(WhisperError::GenericError(ret))
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}
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}
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/// Number of generated text segments.
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/// A segment can be a few words, a sentence, or even a paragraph.
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///
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/// # C++ equivalent
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/// `int whisper_full_n_segments(struct whisper_context * ctx)`
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#[inline]
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pub fn full_n_segments(&self) -> Result<c_int, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_full_n_segments_from_state(self.ptr) })
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}
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/// Language ID associated with the provided state.
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///
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/// # C++ equivalent
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/// `int whisper_full_lang_id_from_state(struct whisper_state * state);`
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#[inline]
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pub fn full_lang_id_from_state(&self) -> Result<c_int, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_full_lang_id_from_state(self.ptr) })
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}
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/// Get the start time of the specified segment.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # C++ equivalent
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/// `int64_t whisper_full_get_segment_t0(struct whisper_context * ctx, int i_segment)`
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#[inline]
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pub fn full_get_segment_t0(&self, segment: c_int) -> Result<i64, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_full_get_segment_t0_from_state(self.ptr, segment) })
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}
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/// Get the end time of the specified segment.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # C++ equivalent
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/// `int64_t whisper_full_get_segment_t1(struct whisper_context * ctx, int i_segment)`
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#[inline]
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pub fn full_get_segment_t1(&self, segment: c_int) -> Result<i64, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_full_get_segment_t1_from_state(self.ptr, segment) })
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}
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/// Get the text of the specified segment.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # Returns
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/// Ok(String) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `const char * whisper_full_get_segment_text(struct whisper_context * ctx, int i_segment)`
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pub fn full_get_segment_text(&self, segment: c_int) -> Result<String, WhisperError> {
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let ret =
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unsafe { whisper_rs_sys::whisper_full_get_segment_text_from_state(self.ptr, segment) };
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if ret.is_null() {
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return Err(WhisperError::NullPointer);
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}
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let c_str = unsafe { CStr::from_ptr(ret) };
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let r_str = c_str.to_str()?;
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Ok(r_str.to_string())
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}
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/// Get the text of the specified segment.
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/// This function differs from [WhisperState::full_get_segment_text]
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/// in that it ignores invalid UTF-8 in whisper strings,
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/// instead opting to replace it with the replacement character.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # Returns
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/// Ok(String) on success, Err(WhisperError) on failure.
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///
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/// # C++ equivalent
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/// `const char * whisper_full_get_segment_text(struct whisper_context * ctx, int i_segment)`
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pub fn full_get_segment_text_lossy(&self, segment: c_int) -> Result<String, WhisperError> {
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let ret =
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unsafe { whisper_rs_sys::whisper_full_get_segment_text_from_state(self.ptr, segment) };
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if ret.is_null() {
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return Err(WhisperError::NullPointer);
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}
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let c_str = unsafe { CStr::from_ptr(ret) };
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Ok(c_str.to_string_lossy().to_string())
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}
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/// Get the bytes of the specified segment.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # Returns
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/// `Ok(Vec<u8>)` on success, `Err(WhisperError)` on failure.
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///
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/// # C++ equivalent
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/// `const char * whisper_full_get_segment_text(struct whisper_context * ctx, int i_segment)`
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pub fn full_get_segment_bytes(&self, segment: c_int) -> Result<Vec<u8>, WhisperError> {
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let ret =
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unsafe { whisper_rs_sys::whisper_full_get_segment_text_from_state(self.ptr, segment) };
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if ret.is_null() {
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return Err(WhisperError::NullPointer);
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}
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let c_str = unsafe { CStr::from_ptr(ret) };
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Ok(c_str.to_bytes().to_vec())
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}
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/// Get number of tokens in the specified segment.
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///
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/// # Arguments
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/// * segment: Segment index.
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///
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/// # Returns
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/// c_int
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///
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/// # C++ equivalent
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/// `int whisper_full_n_tokens(struct whisper_context * ctx, int i_segment)`
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#[inline]
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pub fn full_n_tokens(&self, segment: c_int) -> Result<c_int, WhisperError> {
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Ok(unsafe { whisper_rs_sys::whisper_full_n_tokens_from_state(self.ptr, segment) })
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}
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/// Get the token text of the specified token in the specified segment.
|
|
///
|
|
/// # Arguments
|
|
/// * segment: Segment index.
|
|
/// * token: Token index.
|
|
///
|
|
/// # Returns
|
|
/// Ok(String) on success, Err(WhisperError) on failure.
|
|
///
|
|
/// # C++ equivalent
|
|
/// `const char * whisper_full_get_token_text(struct whisper_context * ctx, int i_segment, int i_token)`
|
|
pub fn full_get_token_text(
|
|
&self,
|
|
segment: c_int,
|
|
token: c_int,
|
|
) -> Result<String, WhisperError> {
|
|
let ret = unsafe {
|
|
whisper_rs_sys::whisper_full_get_token_text_from_state(
|
|
self.ctx, self.ptr, segment, token,
|
|
)
|
|
};
|
|
if ret.is_null() {
|
|
return Err(WhisperError::NullPointer);
|
|
}
|
|
let c_str = unsafe { CStr::from_ptr(ret) };
|
|
let r_str = c_str.to_str()?;
|
|
Ok(r_str.to_string())
|
|
}
|
|
|
|
/// Get the token text of the specified token in the specified segment.
|
|
/// This function differs from [WhisperState::full_get_token_text]
|
|
/// in that it ignores invalid UTF-8 in whisper strings,
|
|
/// instead opting to replace it with the replacement character.
|
|
///
|
|
/// # Arguments
|
|
/// * segment: Segment index.
|
|
/// * token: Token index.
|
|
///
|
|
/// # Returns
|
|
/// Ok(String) on success, Err(WhisperError) on failure.
|
|
///
|
|
/// # C++ equivalent
|
|
/// `const char * whisper_full_get_token_text(struct whisper_context * ctx, int i_segment, int i_token)`
|
|
pub fn full_get_token_text_lossy(
|
|
&self,
|
|
segment: c_int,
|
|
token: c_int,
|
|
) -> Result<String, WhisperError> {
|
|
let ret = unsafe {
|
|
whisper_rs_sys::whisper_full_get_token_text_from_state(
|
|
self.ctx, self.ptr, segment, token,
|
|
)
|
|
};
|
|
if ret.is_null() {
|
|
return Err(WhisperError::NullPointer);
|
|
}
|
|
let c_str = unsafe { CStr::from_ptr(ret) };
|
|
Ok(c_str.to_string_lossy().to_string())
|
|
}
|
|
|
|
/// Get the token ID of the specified token in the specified segment.
|
|
///
|
|
/// # Arguments
|
|
/// * segment: Segment index.
|
|
/// * token: Token index.
|
|
///
|
|
/// # Returns
|
|
/// [crate::WhisperToken]
|
|
///
|
|
/// # C++ equivalent
|
|
/// `whisper_token whisper_full_get_token_id (struct whisper_context * ctx, int i_segment, int i_token)`
|
|
pub fn full_get_token_id(
|
|
&self,
|
|
segment: c_int,
|
|
token: c_int,
|
|
) -> Result<WhisperToken, WhisperError> {
|
|
Ok(unsafe {
|
|
whisper_rs_sys::whisper_full_get_token_id_from_state(self.ptr, segment, token)
|
|
})
|
|
}
|
|
|
|
/// Get token data for the specified token in the specified segment.
|
|
///
|
|
/// # Arguments
|
|
/// * segment: Segment index.
|
|
/// * token: Token index.
|
|
///
|
|
/// # Returns
|
|
/// [crate::WhisperTokenData]
|
|
///
|
|
/// # C++ equivalent
|
|
/// `whisper_token_data whisper_full_get_token_data(struct whisper_context * ctx, int i_segment, int i_token)`
|
|
#[inline]
|
|
pub fn full_get_token_data(
|
|
&self,
|
|
segment: c_int,
|
|
token: c_int,
|
|
) -> Result<WhisperTokenData, WhisperError> {
|
|
Ok(unsafe {
|
|
whisper_rs_sys::whisper_full_get_token_data_from_state(self.ptr, segment, token)
|
|
})
|
|
}
|
|
|
|
/// Get the probability of the specified token in the specified segment.
|
|
///
|
|
/// # Arguments
|
|
/// * segment: Segment index.
|
|
/// * token: Token index.
|
|
///
|
|
/// # Returns
|
|
/// f32
|
|
///
|
|
/// # C++ equivalent
|
|
/// `float whisper_full_get_token_p(struct whisper_context * ctx, int i_segment, int i_token)`
|
|
#[inline]
|
|
pub fn full_get_token_prob(&self, segment: c_int, token: c_int) -> Result<f32, WhisperError> {
|
|
Ok(
|
|
unsafe {
|
|
whisper_rs_sys::whisper_full_get_token_p_from_state(self.ptr, segment, token)
|
|
},
|
|
)
|
|
}
|
|
|
|
/// Get whether the next segment is predicted as a speaker turn.
|
|
///
|
|
/// # Arguments
|
|
/// * i_segment: Segment index.
|
|
///
|
|
/// # Returns
|
|
/// bool
|
|
///
|
|
/// # C++ equivalent
|
|
/// `bool whisper_full_get_segment_speaker_turn_next_from_state(struct whisper_state * state, int i_segment)`
|
|
pub fn full_get_segment_speaker_turn_next(&mut self, i_segment: c_int) -> bool {
|
|
unsafe {
|
|
whisper_rs_sys::whisper_full_get_segment_speaker_turn_next_from_state(
|
|
self.ptr, i_segment,
|
|
)
|
|
}
|
|
}
|
|
}
|