X-Git-Url: https://git.distorted.org.uk/~mdw/disorder/blobdiff_plain/937be4c02816d026de3063f32d82fafda1f3c512..3bfecfac3fadac2fbf945d950a557292e8efb73a:/server/speaker.h

diff --git a/server/speaker.h b/server/speaker.h
index 4e22d38..de89ee0 100644
--- a/server/speaker.h
+++ b/server/speaker.h
@@ -47,12 +47,16 @@
 
 /** @brief Bytes to send per network packet
  *
+ * This is the maximum number of bytes we pass to write(2); to determine actual
+ * packet sizes, add a UDP header and an IP header (and a link layer header if
+ * it's the link layer size you care about).
+ *
  * Don't make this too big or arithmetic will start to overflow.
  */
-#define NETWORK_BYTES (1024+sizeof(struct rtp_header))
+#define NETWORK_BYTES (1500-8/*UDP*/-40/*IP*/-8/*conservatism*/)
 
 /** @brief Maximum RTP playahead (ms) */
-#define RTP_AHEAD_MS 1000
+#define RTP_AHEAD_MS 100
 
 /** @brief Maximum number of FDs to poll for */
 #define NFDS 256
@@ -163,12 +167,18 @@ struct speaker_backend {
   void (*deactivate)(void);
 
   /** @brief Called before poll()
+   * @param timeoutp Pointer to timeout
+   *
+   * Called before the call to poll().
+   *
+   * If desirable, should call addfd() to update the FD array and stash the
+   * slot number somewhere safe.  This will only be called if @ref device_state
+   * is @ref device_open.
    *
-   * Called before the call to poll().  Should call addfd() to update
-   * the FD array and stash the slot number somewhere safe.  This will
-   * only be called if @ref device_state = @ref device_open.
+   * @p timeoutp points to the poll timeout value in milliseconds.  It may be
+   * reduced, but never increased.
    */
-  void (*beforepoll)(void);
+  void (*beforepoll)(int *timeoutp);
 
   /** @brief Called after poll()
    * @return 1 if output device ready for play, 0 otherwise
@@ -213,6 +223,7 @@ extern const struct speaker_backend network_backend;
 extern const struct speaker_backend alsa_backend;
 extern const struct speaker_backend command_backend;
 extern const struct speaker_backend coreaudio_backend;
+extern const struct speaker_backend oss_backend;
 
 extern struct pollfd fds[NFDS];
 extern int fdno;