xrdpvr: added volume message

xrdpvr/xrdpvr.c

@@ -750,3 +750,38 @@ xrdpvr_write_to_client(void *channel, STREAM *s)
         usleep(1000 * 3);
     }
 }
+
+/**
+ * write set volume to a xrdpvr client
+ *
+ * @param  channel  opaque handle returned by WTSVirtualChannelOpenEx
+ * @param  volume   volume 0x0000 to 0xffff
+ *
+ * @return 0 on success, -1 on failure
+ ******************************************************************************/
+int
+send_volume(void *channel, int volume)
+{
+    STREAM  *s;
+    char    *cptr;
+    int     rv;
+    int     len;
+
+    stream_new(s, MAX_BUFSIZE);
+
+    stream_ins_u32_le(s, 0); /* number of bytes to follow */
+    stream_ins_u32_le(s, CMD_SET_VOLUME);
+    stream_ins_u32_le(s, volume);
+
+    /* insert number of bytes in stream */
+    len = stream_length(s) - 4;
+    cptr = s->p;
+    s->p = s->data;
+    stream_ins_u32_le(s, len);
+    s->p = cptr;
+
+    /* write data to virtual channel */
+    rv = xrdpvr_write_to_client(channel, s);
+    stream_free(s);
+    return rv;
+}

xrdpvr/xrdpvr.h

@@ -44,6 +44,7 @@ int  xrdpvr_seek_media(int64_t pos, int backward);
 int  xrdpvr_get_frame(void **av_pkt_ret, int *is_video_frame, int *delay_in_us);
 int  send_audio_pkt(void *channel, int stream_id, void *pkt_p);
 int  send_video_pkt(void *channel, int stream_id, void *pkt_p);
+int  send_volume(void *channel, int volume);
 
 #ifdef __cplusplus
 }

xrdpvr/xrdpvr_internal.h

@@ -61,6 +61,7 @@
 #define CMD_WRITE_META_DATA         7
 #define CMD_DEINIT_XRDPVR           8
 #define CMD_SET_GEOMETRY            9
+#define CMD_SET_VOLUME              10
 
 /* max number of bytes we can send in one pkt */
 #define MAX_PDU_SIZE                1600