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output/ao: simplify write_size checks

This commit is contained in:
Max Kellermann 2022-07-12 12:39:08 +02:00
parent 4f8d2a8b1c
commit f5d104e7af
1 changed files with 9 additions and 10 deletions
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19
src/output/plugins/AoOutputPlugin.cxx
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@ -58,6 +58,8 @@ class AoOutput final : AudioOutput, SafeSingleton<AoInit> {
size_t frame_size;
std::size_t max_size;
explicit AoOutput(const ConfigBlock &block);
~AoOutput() override;
@ -173,6 +175,11 @@ AoOutput::Open(AudioFormat &audio_format)
frame_size = audio_format.GetFrameSize();
/* round down to a multiple of the frame size */
/* no matter how small "write_size" was configured, we must
pass at least one frame to libao */
max_size = std::max(write_size / frame_size, std::size_t{1}) * frame_size;
format.rate = audio_format.sample_rate;
format.byte_format = AO_FMT_NATIVE;
format.channels = audio_format.channels;
@ -193,16 +200,8 @@ AoOutput::Play(const void *chunk, size_t size)
{
assert(size % frame_size == 0);
if (size > write_size) {
/* round down to a multiple of the frame size */
size = (write_size / frame_size) * frame_size;
if (size < frame_size)
/* no matter how small "write_size" was
configured, we must pass at least one frame
to libao */
size = frame_size;
}
if (size > max_size)
size = max_size;
/* For whatever reason, libao wants a non-const pointer.
Let's hope it does not write to the buffer, and use the