X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=afs.h;h=96da2da027cf27268c7b5ad1b4af6755b593f7e6;hp=aeaf8fb8189535ec44dbcd14d19f472b710f81d7;hb=ab273892c54e29087d2a6b0d52de8081be1b905f;hpb=11e68b8de3eb8bf8b657333d5b8359260559e93b

diff --git a/afs.h b/afs.h
index aeaf8fb8..96da2da0 100644
--- a/afs.h
+++ b/afs.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2007-2011 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -21,7 +21,7 @@ struct afs_info {
 	uint32_t image_id;
 	/** Lyrics blob associated with this file (foreign key). */
 	uint32_t lyrics_id;
-	/** Mp3, ogg or aac. */
+	/** Mp3, ogg, aac, wma, spx. */
 	uint8_t audio_format_id;
 	/** Amplification value. */
 	uint8_t amp;
@@ -97,7 +97,13 @@ struct afs_table {
 		void *data);
 };
 
-enum play_mode {PLAY_MODE_MOOD, PLAY_MODE_PLAYLIST};
+/** How audio files are selected by afs. */
+enum play_mode {
+	/** Admissible files are determined by a mood definition. */
+	PLAY_MODE_MOOD,
+	/** All listed files are admissible. */
+	PLAY_MODE_PLAYLIST,
+};
 
 /**
  * Data about one audio file.
@@ -123,12 +129,31 @@ struct audio_file_data {
 	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,
-	AFD_CHANGE
 };
 
 /** Flags passed to for_each_matching_row(). */