https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=77f324ae03547c82b724ef5a35bd72b2ecf09e61
commit 77f324ae03547c82b724ef5a35bd72b2ecf09e61 Author: Takashi Yano <[email protected]> Date: Sat Feb 25 10:28:34 2023 +0900 Cygwin: dsp: Fix SNDCTL_DSP_{POST,SYNC} ioctl() behaviour. Previously, SNDCTL_DSP_POST and SNDCTL_DSP_SYNC were implemented wrongly. Due to this issue, module-oss of pulseaudio generates choppy sound when SNDCTL_DSP_POST is called. This patch fixes that. Signed-off-by: Takashi Yano <[email protected]> Diff: --- winsup/cygwin/fhandler/dsp.cc | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/winsup/cygwin/fhandler/dsp.cc b/winsup/cygwin/fhandler/dsp.cc index cfbf6bec7..db7b2550e 100644 --- a/winsup/cygwin/fhandler/dsp.cc +++ b/winsup/cygwin/fhandler/dsp.cc @@ -133,6 +133,8 @@ class fhandler_dev_dsp::Audio_out: public Audio int freq_; int bits_; int channels_; + + friend fhandler_dev_dsp; }; static void CALLBACK waveIn_callback (HWAVEIN hWave, UINT msg, @@ -1417,11 +1419,16 @@ fhandler_dev_dsp::_ioctl (unsigned int cmd, void *buf) return 0; CASE (SNDCTL_DSP_POST) + if (audio_out_) + audio_out_->sendcurrent (); // force out last block whatever size.. + return 0; + CASE (SNDCTL_DSP_SYNC) - // Stop audio out device - close_audio_out (); - // Stop audio in device - close_audio_in (); + if (audio_out_) + { + audio_out_->sendcurrent (); // force out last block whatever size.. + audio_out_->waitforallsent (); // block till finished.. + } return 0; default:
