winecoreaudio: Introduce a stream structure.

dlls/winecoreaudio.drv/unixlib.h

@@ -18,6 +18,29 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+struct coreaudio_stream /* To be made private */
+{
+    OSSpinLock lock;
+    AudioComponentInstance unit;
+    AudioConverterRef converter;
+    AudioStreamBasicDescription dev_desc; /* audio unit format, not necessarily the same as fmt */
+    AudioDeviceID dev_id;
+    EDataFlow flow;
+    AUDCLNT_SHAREMODE share;
+
+    BOOL playing;
+    SIZE_T local_buffer_size, tmp_buffer_size;
+    UINT32 period_ms, period_frames;
+    UINT32 bufsize_frames, resamp_bufsize_frames;
+    UINT32 lcl_offs_frames, held_frames, wri_offs_frames, tmp_buffer_frames;
+    UINT32 cap_bufsize_frames, cap_offs_frames, cap_held_frames;
+    UINT32 wrap_bufsize_frames;
+    UINT64 written_frames;
+    INT32 getbuf_last;
+    WAVEFORMATEX *fmt;
+    BYTE *local_buffer, *cap_buffer, *wrap_buffer, *resamp_buffer, *tmp_buffer;
+};
+
 struct endpoint
 {
     WCHAR *name;