1 files changed, 9 insertions, 7 deletions
diff --git a/alc/backends/sdl2.cpp b/alc/backends/sdl2.cpp
index 4b3b5e63..28d020a1 100644
--- a/alc/backends/sdl2.cpp
+++ b/alc/backends/sdl2.cpp
@@ -62,7 +62,7 @@ struct Sdl2Backend final : public BackendBase {
     void unlock() override;
 
     SDL_AudioDeviceID mDeviceID{0u};
-    ALsizei mFrameSize{0};
+    ALuint mFrameSize{0};
 
     ALuint mFrequency{0u};
     DevFmtChannels mFmtChans{};
@@ -84,14 +84,16 @@ void Sdl2Backend::audioCallbackC(void *ptr, Uint8 *stream, int len)
 
 void Sdl2Backend::audioCallback(Uint8 *stream, int len)
 {
-    assert((len % mFrameSize) == 0);
-    aluMixData(mDevice, stream, len / mFrameSize);
+    const auto ulen = static_cast<unsigned int>(len);
+    assert((ulen % mFrameSize) == 0);
+    aluMixData(mDevice, stream, ulen / mFrameSize);
 }
 
 ALCenum Sdl2Backend::open(const ALCchar *name)
 {
     SDL_AudioSpec want{}, have{};
-    want.freq = mDevice->Frequency;
+
+    want.freq = static_cast<int>(mDevice->Frequency);
     switch(mDevice->FmtType)
     {
         case DevFmtUByte: want.format = AUDIO_U8; break;
@@ -103,7 +105,7 @@ ALCenum Sdl2Backend::open(const ALCchar *name)
         case DevFmtFloat: want.format = AUDIO_F32; break;
     }
     want.channels = (mDevice->FmtChans == DevFmtMono) ? 1 : 2;
-    want.samples = mDevice->UpdateSize;
+    want.samples = static_cast<Uint16>(mDevice->UpdateSize);
     want.callback = &Sdl2Backend::audioCallbackC;
     want.userdata = this;
 
@@ -126,7 +128,7 @@ ALCenum Sdl2Backend::open(const ALCchar *name)
     if(mDeviceID == 0)
         return ALC_INVALID_VALUE;
 
-    mDevice->Frequency = have.freq;
+    mDevice->Frequency = static_cast<ALuint>(have.freq);
     if(have.channels == 1)
         mDevice->FmtChans = DevFmtMono;
     else if(have.channels == 2)
@@ -151,7 +153,7 @@ ALCenum Sdl2Backend::open(const ALCchar *name)
     mDevice->UpdateSize = have.samples;
     mDevice->BufferSize = have.samples * 2; /* SDL always (tries to) use two periods. */
 
-    mFrameSize = mDevice->frameSizeFromFmt();
+    mFrameSize = static_cast<ALuint>(mDevice->frameSizeFromFmt());
     mFrequency = mDevice->Frequency;
     mFmtChans = mDevice->FmtChans;
     mFmtType = mDevice->FmtType;