X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/ea410ba1d3b06ba6f60305c7d31369da134906dd..bb6ae3fb80fff36cd342d6f6bff3dfabd7dd243e:/lib/speaker-protocol.h

diff --git a/lib/speaker-protocol.h b/lib/speaker-protocol.h
index 2002d0b..ac4fdf0 100644
--- a/lib/speaker-protocol.h
+++ b/lib/speaker-protocol.h
@@ -17,22 +17,21 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  * USA
  */
-/** @file lib/speaker-protocol.c
+/** @file lib/speaker-protocol.h
  * @brief Speaker/server protocol support
  *
  * This file defines the protocol by which the main server and the speaker
  * process communicate.
  */
 
-#ifndef SPEAKER_H
-#define SPEAKER_H
+#ifndef SPEAKER_PROTOCOL_H
+#define SPEAKER_PROTOCOL_H
 
 /** @brief A message from the main server to the speaker, or vica versa */
 struct speaker_message {
   /** @brief Message type
    *
    * Messges from the main server:
-   * - @ref SM_PREPARE
    * - @ref SM_PLAY
    * - @ref SM_PAUSE
    * - @ref SM_RESUME
@@ -54,12 +53,6 @@ struct speaker_message {
 };
 
 /* messages from the main DisOrder server */
-/** @brief Prepare track @c id
- *
- * This message will include a file descriptor.  The speaker starts buffering
- * audio data read from this file against the time that it must be played.
- */
-#define SM_PREPARE 0
 
 /** @brief Play track @c id
  *
@@ -96,15 +89,53 @@ struct speaker_message {
  */
 #define SM_PLAYING 131
 
-void speaker_send(int fd, const struct speaker_message *sm, int datafd);
-/* Send a message.  DATAFD is passed too if not -1.  Does not close DATAFD. */
-
-int speaker_recv(int fd, struct speaker_message *sm, int *datafd);
-/* Receive a message.  If DATAFD is not null then can receive an FD.  Return 0
- * on EOF, +ve if a message is read, -1 on EAGAIN, terminates on any other
- * error. */
-
-#endif /* SPEAKER_H */
+/** @brief Speaker process is ready
+ *
+ * This is sent once at startup when the speaker has finished its
+ * initialization. */
+#define SM_READY 132
+
+void speaker_send(int fd, const struct speaker_message *sm);
+/* Send a message. */
+
+int speaker_recv(int fd, struct speaker_message *sm);
+/* Receive a message.  Return 0 on EOF, +ve if a message is read, -1 on EAGAIN,
+ * terminates on any other error. */
+
+/** @brief One chunk in a stream */
+struct stream_header {
+  /** @brief Number of bytes */
+  uint32_t nbytes;
+
+  /** @brief Frames per second */
+  uint32_t rate;
+
+  /** @brief Samples per frames */
+  uint8_t channels;
+
+  /** @brief Bits per sample */
+  uint8_t bits;
+
+  /** @brief Endianness */
+  uint8_t endian;
+#define ENDIAN_BIG 1
+#define ENDIAN_LITTLE 2
+#ifdef WORDS_BIGENDIAN
+# define ENDIAN_NATIVE ENDIAN_BIG
+#else
+# define ENDIAN_NATIVE ENDIAN_LITTLE
+#endif
+} attribute((packed));
+
+static inline int formats_equal(const struct stream_header *a,
+                                const struct stream_header *b) {
+  return (a->rate == b->rate
+          && a->channels == b->channels
+          && a->bits == b->bits
+          && a->endian == b->endian);
+}
+
+#endif /* SPEAKER_PROTOCOL_H */
 
 /*
 Local Variables: