mmdevapi: Fill buffer with silence in IAudioRenderClient::GetBuffer.

dlls/mmdevapi/tests/render.c

@@ -692,8 +692,8 @@ static void test_padding(void)
     IAudioRenderClient *arc;
     WAVEFORMATEX *pwfx;
     REFERENCE_TIME minp, defp;
-    BYTE *buf;
-    UINT32 psize, pad, written;
+    BYTE *buf, silence;
+    UINT32 psize, pad, written, i;
 
     hr = IMMDevice_Activate(dev, &IID_IAudioClient, CLSCTX_INPROC_SERVER,
             NULL, (void**)&ac);
@@ -712,6 +712,11 @@ static void test_padding(void)
     if(hr != S_OK)
         return;
 
+    if(pwfx->wBitsPerSample == 8)
+        silence = 128;
+    else
+        silence = 0;
+
     /** GetDevicePeriod
      * Default (= shared) device period is 10ms (e.g. 441 frames at 44100),
      * except when the HW/OS forces a particular alignment,
@@ -738,6 +743,12 @@ static void test_padding(void)
     hr = IAudioRenderClient_GetBuffer(arc, psize, &buf);
     ok(hr == S_OK, "GetBuffer failed: %08x\n", hr);
     ok(buf != NULL, "NULL buffer returned\n");
+    for(i = 0; i < psize * pwfx->nBlockAlign; ++i){
+        if(buf[i] != silence){
+            ok(0, "buffer has data in it already\n");
+            break;
+        }
+    }
 
     hr = IAudioRenderClient_GetBuffer(arc, 0, &buf);
     ok(hr == AUDCLNT_E_OUT_OF_ORDER, "GetBuffer 0 size failed: %08x\n", hr);

dlls/winealsa.drv/mmdevdrv.c

@@ -2466,6 +2466,18 @@ static ULONG WINAPI AudioRenderClient_Release(IAudioRenderClient *iface)
     return AudioClient_Release(&This->IAudioClient_iface);
 }
 
+static void silence_buffer(ACImpl *This, BYTE *buffer, UINT32 frames)
+{
+    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)This->fmt;
+    if((This->fmt->wFormatTag == WAVE_FORMAT_PCM ||
+            (This->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
+             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
+            This->fmt->wBitsPerSample == 8)
+        memset(buffer, 128, frames * This->fmt->nBlockAlign);
+    else
+        memset(buffer, 0, frames * This->fmt->nBlockAlign);
+}
+
 static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
         UINT32 frames, BYTE **data)
 {
@@ -2515,6 +2527,8 @@ static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
         This->getbuf_last = frames;
     }
 
+    silence_buffer(This, *data, frames);
+
     LeaveCriticalSection(&This->lock);
 
     return S_OK;
@@ -2568,12 +2582,8 @@ static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
     else
         buffer = This->tmp_buffer;
 
-    if(flags & AUDCLNT_BUFFERFLAGS_SILENT){
-        if(This->fmt->wBitsPerSample == 8)
-            memset(buffer, 128, written_frames * This->fmt->nBlockAlign);
-        else
-            memset(buffer, 0, written_frames * This->fmt->nBlockAlign);
-    }
+    if(flags & AUDCLNT_BUFFERFLAGS_SILENT)
+        silence_buffer(This, buffer, written_frames);
 
     if(This->getbuf_last < 0)
         alsa_wrap_buffer(This, buffer, written_frames);

dlls/winecoreaudio.drv/mmdevdrv.c

@@ -2024,6 +2024,18 @@ static ULONG WINAPI AudioRenderClient_Release(IAudioRenderClient *iface)
     return AudioClient_Release(&This->IAudioClient_iface);
 }
 
+static void silence_buffer(ACImpl *This, BYTE *buffer, UINT32 frames)
+{
+    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)This->fmt;
+    if((This->fmt->wFormatTag == WAVE_FORMAT_PCM ||
+            (This->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
+             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
+            This->fmt->wBitsPerSample == 8)
+        memset(buffer, 128, frames * This->fmt->nBlockAlign);
+    else
+        memset(buffer, 0, frames * This->fmt->nBlockAlign);
+}
+
 static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
         UINT32 frames, BYTE **data)
 {
@@ -2094,6 +2106,7 @@ static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
 
     This->getbuf_last = frames;
     *data = This->public_buffer->mAudioData;
+    silence_buffer(This, *data, frames);
 
     OSSpinLockUnlock(&This->lock);
 
@@ -2133,18 +2146,8 @@ static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
         return AUDCLNT_E_INVALID_SIZE;
     }
 
-    if(flags & AUDCLNT_BUFFERFLAGS_SILENT){
-        WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)This->fmt;
-        if((This->fmt->wFormatTag == WAVE_FORMAT_PCM ||
-                (This->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
-                 IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
-                This->fmt->wBitsPerSample == 8)
-            memset(This->public_buffer->mAudioData, 128,
-                    frames * This->fmt->nBlockAlign);
-        else
-            memset(This->public_buffer->mAudioData, 0,
-                    frames * This->fmt->nBlockAlign);
-    }
+    if(flags & AUDCLNT_BUFFERFLAGS_SILENT)
+        silence_buffer(This, This->public_buffer->mAudioData, frames);
 
     This->public_buffer->mAudioDataByteSize = frames * This->fmt->nBlockAlign;
 

dlls/wineoss.drv/mmdevdrv.c

@@ -1367,12 +1367,16 @@ static HRESULT WINAPI AudioClient_GetDevicePeriod(IAudioClient *iface,
     return S_OK;
 }
 
-static void oss_silence_buffer(ACImpl *This, BYTE *buf, UINT32 frames)
-{
-    if(This->fmt->wBitsPerSample == 8)
-        memset(buf, 128, frames * This->fmt->nBlockAlign);
+static void silence_buffer(ACImpl *This, BYTE *buffer, UINT32 frames)
+{
+    WAVEFORMATEXTENSIBLE *fmtex = (WAVEFORMATEXTENSIBLE*)This->fmt;
+    if((This->fmt->wFormatTag == WAVE_FORMAT_PCM ||
+            (This->fmt->wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
+             IsEqualGUID(&fmtex->SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))) &&
+            This->fmt->wBitsPerSample == 8)
+        memset(buffer, 128, frames * This->fmt->nBlockAlign);
     else
-        memset(buf, 0, frames * This->fmt->nBlockAlign);
+        memset(buffer, 0, frames * This->fmt->nBlockAlign);
 }
 
 static void oss_write_data(ACImpl *This)
@@ -1419,7 +1423,7 @@ static void oss_write_data(ACImpl *This)
     to_write_bytes = to_write_frames * This->fmt->nBlockAlign;
 
     if(This->session->mute)
-        oss_silence_buffer(This, buf, to_write_frames);
+        silence_buffer(This, buf, to_write_frames);
 
     written_bytes = write(This->fd, buf, to_write_bytes);
     if(written_bytes < 0){
@@ -1445,7 +1449,7 @@ static void oss_write_data(ACImpl *This)
         to_write_bytes = to_write_frames * This->fmt->nBlockAlign;
 
         if(This->session->mute)
-            oss_silence_buffer(This, This->local_buffer, to_write_frames);
+            silence_buffer(This, This->local_buffer, to_write_frames);
 
         written_bytes = write(This->fd, This->local_buffer, to_write_bytes);
         if(written_bytes < 0){
@@ -1846,6 +1850,8 @@ static HRESULT WINAPI AudioRenderClient_GetBuffer(IAudioRenderClient *iface,
         This->getbuf_last = frames;
     }
 
+    silence_buffer(This, *data, frames);
+
     LeaveCriticalSection(&This->lock);
 
     return S_OK;
@@ -1902,7 +1908,7 @@ static HRESULT WINAPI AudioRenderClient_ReleaseBuffer(
         buffer = This->tmp_buffer;
 
     if(flags & AUDCLNT_BUFFERFLAGS_SILENT)
-        oss_silence_buffer(This, buffer, written_frames);
+        silence_buffer(This, buffer, written_frames);
 
     if(This->getbuf_last < 0)
         oss_wrap_buffer(This, buffer, written_frames);