From 9d90ceb27461d7d0d172fd941b812d511794a6c6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Volker=20R=C3=BCmelin?= Date: Sun, 26 Dec 2021 16:40:16 +0100 Subject: [PATCH] dsoundaudio: fix crackling audio recordings MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Audio recordings with the DirectSound backend don't sound right. A look a the Microsoft online documentation tells us why. From the DirectSound Programming Guide, Capture Buffer Information: 'You can safely copy data from the buffer only up to the read cursor.' Change the code to read up to the read cursor instead of the capture cursor. Signed-off-by: Volker Rümelin Message-Id: <20211226154017.6067-2-vr_qemu@t-online.de> Signed-off-by: Gerd Hoffmann --- audio/dsoundaudio.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/audio/dsoundaudio.c b/audio/dsoundaudio.c index cfc79c129e..3dd2c4d4a6 100644 --- a/audio/dsoundaudio.c +++ b/audio/dsoundaudio.c @@ -536,13 +536,12 @@ static void *dsound_get_buffer_in(HWVoiceIn *hw, size_t *size) DSoundVoiceIn *ds = (DSoundVoiceIn *) hw; LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer; HRESULT hr; - DWORD cpos, rpos, act_size; + DWORD rpos, act_size; size_t req_size; int err; void *ret; - hr = IDirectSoundCaptureBuffer_GetCurrentPosition( - dscb, &cpos, ds->first_time ? &rpos : NULL); + hr = IDirectSoundCaptureBuffer_GetCurrentPosition(dscb, NULL, &rpos); if (FAILED(hr)) { dsound_logerr(hr, "Could not get capture buffer position\n"); *size = 0; @@ -554,7 +553,7 @@ static void *dsound_get_buffer_in(HWVoiceIn *hw, size_t *size) ds->first_time = false; } - req_size = audio_ring_dist(cpos, hw->pos_emul, hw->size_emul); + req_size = audio_ring_dist(rpos, hw->pos_emul, hw->size_emul); req_size = MIN(*size, MIN(req_size, hw->size_emul - hw->pos_emul)); if (req_size == 0) {