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fix(desktop): cushion Pocket playback underruns

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Signed-off-by: John Tennant <jtennant@block.xyz>
This commit is contained in:
John Tennant
2026-07-29 11:55:24 -04:00
parent 92e54250b6
commit 211d17c585
1 changed files with 11 additions and 12 deletions
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desktop/src-tauri/src/huddle/tts.rs
+11 -12
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@@ -550,7 +550,7 @@ fn tts_worker(
&mut first_append,
audio,
silence_buf_len,
model_chunk_index == 0,
model_chunk_index == 0 || player.empty(),
ends_playback_chunk,
);
@@ -699,13 +699,12 @@ fn apply_fade_out(samples: &mut [f32]) {
}
}
/// Build the single buffer appended to the rodio `Player` for one synthesised
/// sentence.
/// Build one buffer appended to the rodio `Player` for a synthesis unit.
///
/// Every sentence chunk gets a short lead-in pad immediately before its audio.
/// This matters for chunks that start with soft first phonemes (`I'm`, `I've`):
/// the synthesized buffer can begin with speech within the first millisecond,
/// so the playback layer must provide the device/mixer cushion.
/// Every playback boundary gets a short lead-in pad immediately before its
/// audio. This matters for chunks that start with soft first phonemes (`I'm`,
/// `I've`): the synthesized buffer can begin with speech within the first
/// millisecond, so the playback layer must provide the device/mixer cushion.
/// To keep the audible gap unchanged, the trailing silence after this chunk is
/// shortened by the same amount (`silence_buf_len - SENTENCE_LEAD_IN_SAMPLES`):
/// sentence N contributes 80 ms of post-speech silence and sentence N+1
@@ -716,15 +715,15 @@ fn apply_fade_out(samples: &mut [f32]) {
/// tracked source per synthesized sentence, avoiding source-boundary/drain
/// regressions from enqueueing the lead-in, audio, and tail as separate sounds.
///
/// A playback chunk may contain several model-sized synthesis units. Only the
/// first unit receives the onset cushion and only the last receives the
/// remaining gap. If playback underruns while the next unit is synthesized,
/// that unit becomes a new playback boundary and receives a fresh cushion.
///
/// `first_append` is flipped on the first call after the player goes idle.
/// The worker uses it in the idle branch of the main loop to distinguish
/// "never queued anything since last drain" from "drained after speaking",
/// which controls when `tts_active` is released and the lead-in re-armed.
/// Add silence only at the outer playback boundary.
///
/// A playback chunk may contain several model-sized synthesis units. The first
/// unit receives the onset cushion, the last receives the remaining gap, and
/// intermediate units stay sample-contiguous.
fn build_sentence_append_buffer(
first_append: &mut bool,
audio: Vec<f32>,