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/*******************************************************************************
*
* Copyright (c) 2026 Haixing Hu.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0.
*
******************************************************************************/
use core::num::NonZeroUsize;
use super::TranscodeStatus;
/// Counts how much work a [`crate::BufferedTranscoder`] completed before returning.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct TranscodeProgress {
/// Stop reason reported by the transcoder.
status: TranscodeStatus,
/// Number of input units consumed from the requested input index.
read: usize,
/// Number of output units written from the requested output index.
written: usize,
}
impl TranscodeProgress {
/// Creates a progress value.
///
/// # Parameters
///
/// - `status`: The reason conversion stopped.
/// - `read`: Number of input units consumed from the call's input index.
/// - `written`: Number of output units written from the call's output index.
///
/// # Returns
///
/// Returns a progress value carrying the supplied counters.
#[must_use]
#[inline(always)]
pub const fn new(status: TranscodeStatus, read: usize, written: usize) -> Self {
Self { status, read, written }
}
/// Creates a completed progress value.
///
/// # Parameters
///
/// - `read`: Number of consumed input units.
/// - `written`: Number of produced output units.
///
/// # Returns
///
/// Returns a progress value whose status is [`TranscodeStatus::Complete`].
#[must_use]
#[inline(always)]
pub const fn complete(read: usize, written: usize) -> Self {
Self::new(TranscodeStatus::Complete, read, written)
}
/// Creates progress that stopped because more input is needed.
///
/// # Parameters
///
/// - `input_index`: Absolute input boundary where conversion stopped.
/// - `additional`: Additional input units required to continue.
/// - `available`: Input units currently available at the boundary.
/// - `read`: Number of consumed input units.
/// - `written`: Number of produced output units.
///
/// # Returns
///
/// Returns a progress value with [`TranscodeStatus::NeedInput`].
#[must_use]
#[inline(always)]
pub const fn need_input(
input_index: usize,
additional: NonZeroUsize,
available: usize,
read: usize,
written: usize,
) -> Self {
Self::new(
TranscodeStatus::need_input(input_index, additional, available),
read,
written,
)
}
/// Creates progress that stopped because more output capacity is needed.
///
/// # Parameters
///
/// - `output_index`: Absolute output boundary where conversion stopped.
/// - `additional`: Additional output units required to continue.
/// - `available`: Output units currently available at the boundary.
/// - `read`: Number of consumed input units.
/// - `written`: Number of produced output units.
///
/// # Returns
///
/// Returns a progress value with [`TranscodeStatus::NeedOutput`].
#[must_use]
#[inline(always)]
pub const fn need_output(
output_index: usize,
additional: NonZeroUsize,
available: usize,
read: usize,
written: usize,
) -> Self {
Self::new(
TranscodeStatus::need_output(output_index, additional, available),
read,
written,
)
}
/// Returns the status that stopped conversion.
///
/// # Returns
///
/// Returns the stored [`TranscodeStatus`].
#[must_use]
#[inline(always)]
pub const fn status(self) -> TranscodeStatus {
self.status
}
/// Returns the number of input units consumed by the call.
///
/// # Returns
///
/// Returns a count relative to the input index passed to the conversion call.
#[must_use]
#[inline(always)]
pub const fn read(self) -> usize {
self.read
}
/// Returns the number of output units written by the call.
///
/// # Returns
///
/// Returns a count relative to the output index passed to the conversion call.
#[must_use]
#[inline(always)]
pub const fn written(self) -> usize {
self.written
}
/// Rebases `read` and `written` onto `self` while preserving its stop reason.
///
/// Nested engines report progress scoped to one sub-step. Callers that
/// orchestrate several sub-steps must replace those counters with totals
/// relative to the outer call while keeping boundary fields from the
/// sub-step status.
///
/// # Parameters
///
/// - `read`: Input units consumed relative to the outer call's input index.
/// - `written`: Output units written relative to the outer call's output index.
///
/// # Returns
///
/// Returns progress with the same status as `self` and the supplied counters.
#[must_use]
#[inline(always)]
pub const fn with_counters(self, read: usize, written: usize) -> Self {
match self.status {
TranscodeStatus::Complete => Self::complete(read, written),
TranscodeStatus::NeedInput {
input_index,
additional,
available,
} => Self::need_input(input_index, additional, available, read, written),
TranscodeStatus::NeedOutput {
output_index,
additional,
available,
} => Self::need_output(output_index, additional, available, read, written),
}
}
/// Returns the additional unit count required by the reported status.
///
/// # Returns
///
/// Returns `Some` with a non-zero count when conversion needs more input or
/// output. Returns `None` when conversion completed.
#[must_use]
#[inline(always)]
pub const fn additional(self) -> Option<NonZeroUsize> {
match self.status {
TranscodeStatus::Complete => None,
TranscodeStatus::NeedInput { additional, .. } => Some(additional),
TranscodeStatus::NeedOutput { additional, .. } => Some(additional),
}
}
/// Returns the absolute boundary index associated with this status, if any.
///
/// - For [`TranscodeStatus::NeedInput`], returns `input_index`.
/// - For [`TranscodeStatus::NeedOutput`], returns `output_index`.
/// - For [`TranscodeStatus::Complete`], returns `None`.
/// # Returns
///
/// Returns the boundary index for non-complete status values.
#[must_use]
#[inline(always)]
pub const fn index(self) -> Option<usize> {
match self.status {
TranscodeStatus::Complete => None,
TranscodeStatus::NeedInput { input_index, .. } => Some(input_index),
TranscodeStatus::NeedOutput { output_index, .. } => Some(output_index),
}
}
/// Returns the number of available units at the reported status boundary.
///
/// # Returns
///
/// Returns `0` when conversion completed.
#[must_use]
#[inline(always)]
pub const fn available(self) -> usize {
match self.status {
TranscodeStatus::Complete => 0,
TranscodeStatus::NeedInput { available, .. } => available,
TranscodeStatus::NeedOutput { available, .. } => available,
}
}
}