winealsa: Introduce a stream structure.

dlls/winealsa.drv/unixlib.h

@@ -16,6 +16,41 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#include "audioclient.h"
+
+struct alsa_stream
+{
+    snd_pcm_t *pcm_handle;
+    snd_pcm_uframes_t alsa_bufsize_frames, alsa_period_frames, safe_rewind_frames;
+    snd_pcm_hw_params_t *hw_params; /* does not hold state between calls */
+    snd_pcm_format_t alsa_format;
+
+    LARGE_INTEGER last_period_time;
+
+    WAVEFORMATEX *fmt;
+    DWORD flags;
+    AUDCLNT_SHAREMODE share;
+    HANDLE event;
+
+    BOOL need_remapping;
+    int alsa_channels;
+    int alsa_channel_map[32];
+
+    BOOL started;
+    REFERENCE_TIME mmdev_period_rt;
+    UINT64 written_frames, last_pos_frames;
+    UINT32 bufsize_frames, held_frames, tmp_buffer_frames, mmdev_period_frames;
+    snd_pcm_uframes_t remapping_buf_frames;
+    UINT32 lcl_offs_frames; /* offs into local_buffer where valid data starts */
+    UINT32 wri_offs_frames; /* where to write fresh data in local_buffer */
+    UINT32 hidden_frames;   /* ALSA reserve to ensure continuous rendering */
+    UINT32 vol_adjusted_frames; /* Frames we've already adjusted the volume of but didn't write yet */
+    UINT32 data_in_alsa_frames;
+
+    BYTE *local_buffer, *tmp_buffer, *remapping_buf, *silence_buf;
+    LONG32 getbuf_last; /* <0 when using tmp_buffer */
+};
+
 struct endpoint
 {
     WCHAR *name;