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Fix dangling references with CPAL aux buffers

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This commit is contained in:
Robbert van der Helm 2023-02-23 22:30:32 +01:00
parent c6e0be341f
commit 3ca24bdc8c
1 changed files with 37 additions and 12 deletions
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49
src/wrapper/standalone/backend/cpal.rs
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@ -370,15 +370,12 @@ impl Cpal {
channel_count.get() as usize
]);
let aux_storage = aux_input_storage.last_mut().unwrap();
// We'll preallocate the slices, but we'll only assign them to point to
// `aux_input_storage` at the start of the audio callback
let mut aux_buffer = Buffer::default();
unsafe {
aux_buffer.set_slices(self.config.period_size as usize, |output_slices| {
// SAFETY: `aux_storage` is no longer used directly after this
*output_slices = aux_storage
.iter_mut()
.map(|channel| &mut *(channel.as_mut_slice() as *mut [f32]))
.collect();
output_slices.resize_with(channel_count.get() as usize, || &mut []);
})
}
aux_input_buffers.push(aux_buffer);
@ -392,15 +389,10 @@ impl Cpal {
channel_count.get() as usize
]);
let aux_storage = aux_output_storage.last_mut().unwrap();
let mut aux_buffer = Buffer::default();
unsafe {
aux_buffer.set_slices(self.config.period_size as usize, |output_slices| {
// SAFETY: `aux_storage` is no longer used directly after this
*output_slices = aux_storage
.iter_mut()
.map(|channel| &mut *(channel.as_mut_slice() as *mut [f32]))
.collect();
output_slices.resize_with(channel_count.get() as usize, || &mut []);
})
}
aux_output_buffers.push(aux_buffer);
@ -427,6 +419,39 @@ impl Cpal {
})
}
for (aux_buffer, aux_storage) in aux_input_buffers
.iter_mut()
.zip(aux_input_storage.iter_mut())
{
unsafe {
aux_buffer.set_slices(config.period_size as usize, |output_slices| {
for (output_slice, channel) in
output_slices.iter_mut().zip(aux_storage.iter_mut())
{
// SAFETY: `aux_input_storage` is no longer used directly after this,
// and it outlives the data closure
*output_slice = &mut *(channel.as_mut_slice() as *mut [f32]);
}
})
}
}
for (aux_buffer, aux_storage) in aux_output_buffers
.iter_mut()
.zip(aux_output_storage.iter_mut())
{
unsafe {
aux_buffer.set_slices(config.period_size as usize, |output_slices| {
for (output_slice, channel) in
output_slices.iter_mut().zip(aux_storage.iter_mut())
{
// SAFETY: `aux_output_storage` is no longer used directly after this,
// and it outlives the data closure
*output_slice = &mut *(channel.as_mut_slice() as *mut [f32]);
}
})
}
}
let mut transport = Transport::new(config.sample_rate);
transport.pos_samples = Some(num_processed_samples);
transport.tempo = Some(config.tempo as f64);