+ /** The score value (if -a was given). */
+ long score;
+ /** The hash value of audio file data. */
+ unsigned char *hash;
+};
+
+/** Data about the current audio file, passed from afs to server. */
+struct audio_file_data {
+ /** The open file descriptor to the current audio file. */
+ int fd;
+ /** Vss needs this for streaming. */
+ struct afh_info afhi;
+ /** Size of the largest chunk. */
+ uint32_t max_chunk_size;
+ /** Needed to get the audio file header. */
+ uint8_t audio_format_id;
+};
+
+/**
+ * Codes used for communication between the server and the afs process.
+ *
+ * Before forking the afs child, para_server creates a bidirectional pipe
+ * through which both processes communicate. Usually para_server requests a new
+ * audio in order to start streaming or when the end of the current audio file
+ * has been reached. The afs process responds to such a request by sending
+ * back an eight byte buffer. The first four bytes is the uint32_t
+ * representation of the code, usually \p NEXT_AUDIO_FILE if an admissible
+ * audio file was found, successfully opened and verified. The other four bytes
+ * represent the shared memory id of the shared memory area that contains
+ * details about the audio file to be streamed next. The open file descriptor
+ * of that file is also passed from afs to para_server through the same pipe.
+ */
+enum afs_server_code {
+ /** An audio file was successfully opened. */
+ NEXT_AUDIO_FILE,
+ /** No admissible audio file was found. */
+ NO_ADMISSIBLE_FILES,