Handle padding between device sample frames

The padding must be constant and sample type aligned (e.g. some fixed multiple
of two bytes between the start of two consecutive frames for 16-bit output).
The intent is to always have the ability for stereo output with WASAPI even if
the device has some other unsupported configuration, as long as front-left and
front-right exist.

1 files changed, 4 insertions, 2 deletions

diff --git a/alc/backends/jack.cpp b/alc/backends/jack.cpp
index c7bf8469..2be52e35 100644
--- a/alc/backends/jack.cpp
+++ b/alc/backends/jack.cpp
@@ -292,6 +292,8 @@ int JackPlayback::mixerProc()
     SetRTPriority();
     althrd_setname(MIXER_THREAD_NAME);
 
+    const size_t frame_step{mDevice->channelsFromFmt()};
+
     std::unique_lock<JackPlayback> dlock{*this};
     while(!mKillNow.load(std::memory_order_acquire) &&
           mDevice->Connected.load(std::memory_order_acquire))
@@ -311,9 +313,9 @@ int JackPlayback::mixerProc()
         ALuint len1{minu(static_cast<ALuint>(data.first.len), todo)};
         ALuint len2{minu(static_cast<ALuint>(data.second.len), todo-len1)};
 
-        aluMixData(mDevice, data.first.buf, len1);
+        aluMixData(mDevice, data.first.buf, len1, frame_step);
         if(len2 > 0)
-            aluMixData(mDevice, data.second.buf, len2);
+            aluMixData(mDevice, data.second.buf, len2, frame_step);
         mRing->writeAdvance(todo);
     }