Rework the wire protocol

Send a command stream over the socket.
Implement a new buffer object that holds the data and commands.
Make iterator and builders to parse and construct buffers.
Rework gstreamer elements to use new API for creating and parsing
buffers.
Add _release_buffer to notify a stream when we are done processing the
buffer. This will eventually go all the way to the server and will allow
us to do more complicated buffer management.

1 files changed, 13 insertions, 11 deletions

diff --git a/doc/design.txt b/doc/design.txt
index 39adb70d..4db76349 100644
--- a/doc/design.txt
+++ b/doc/design.txt
@@ -55,29 +55,31 @@ Wire
 
 Fixed header
 
-<flags>      : 4 bytes
-<seq>        : 4 bytes
-<pts>        : 8 bytes
-<dts-offset> : 8 bytes
+<flags>      : 4 bytes       : buffer flags
+<seq>        : 4 bytes       : sequence number
+<pts>        : 8 bytes       : presentation time
+<dts-offset> : 8 bytes       : dts-offset
+<length>     : 8 bytes       : total message length
 
 Followed by 1 or more type-length-data sections
 
 <type>   : 1 byte
 <length> : variable length, 7 bits, hight bit is continuation marker
-<data>   : <length> bytes
+<data>   : <length> bytes, see below for contents based on <type>
 
 Types:
 
- 0: format change
+ 0: fd-payload section
+
+   <offset>    : 8 bytes      : offset
+   <size>      : 8 bytes      : size
+   <fd-index>  : 4 bytes      : index of fd
+
+ 1: format change
 
    <format-id> : 1 byte       : format id
    <format>    : 0-terminated : contains serialized format
 
- 1: fd-payload section
-
-   <offset>    : 8 bytes      : offset
-   <size>      : 8 bytes      : size
-   <fd-index>  : 1 byte       : index of fd
 
  2: property changes