X-Git-Url: https://git.kaliko.me/?a=blobdiff_plain;f=doc%2Fsource%2Fuse.rst;h=a213247adaf4c7004d207b5acbeb56ad964dc1fb;hb=3ad7f42630c5ec5d913a3cbd6aca40e5d04694c2;hp=d8e46e7e7c216143d980d72bd4f3b3628c428683;hpb=e4003597f43ccb041f81827b56c082cf5554098d;p=python-musicpd.git

diff --git a/doc/source/use.rst b/doc/source/use.rst
index d8e46e7..a213247 100644
--- a/doc/source/use.rst
+++ b/doc/source/use.rst
@@ -1,6 +1,9 @@
 Using the client library
 =========================
 
+Introduction
+------------
+
 The client library can be used as follows:
 
 .. code-block:: python
@@ -11,14 +14,19 @@ The client library can be used as follows:
                                        #   fallback to localhost:6600
                                        # connect support host/port argument as well
     print(client.mpd_version)          # print the mpd protocol version
-    print(client.cmd('one', 2))        # print result of the command "cmd one 2"
+    print(client.cmd('foo', 42))       # print result of the request "cmd foo 42"
+                                       # (nb. for actual command, see link to the protocol below)
     client.disconnect()                # disconnect from the server
 
-For a list of supported commands, their arguments (as MPD currently understands
+In the example above `cmd` in not an actual MPD command, for a list of
+supported commands, their arguments (as MPD currently understands
 them), and the functions used to parse their responses see :ref:`commands`.
 
 See the `MPD protocol documentation`_ for more details.
 
+Command lists
+-------------
+
 Command lists are also supported using `command_list_ok_begin()` and
 `command_list_end()` :
 
@@ -29,6 +37,9 @@ Command lists are also supported using `command_list_ok_begin()` and
     client.status()                      # insert the status command into the list
     results = client.command_list_end()  # results will be a list with the results
 
+Ranges
+------
+
 Provide a 2-tuple as argument for command supporting ranges (cf. `MPD protocol documentation`_ for more details).
 Possible ranges are: "START:END", "START:" and ":" :
 
@@ -52,6 +63,8 @@ as a single colon as argument (i.e. sending just ":"):
 
 Empty start in range (i.e. ":END") are not possible and will raise a CommandError.
 
+Iterators
+----------
 
 Commands may also return iterators instead of lists if `iterate` is set to
 `True`:
@@ -62,6 +75,9 @@ Commands may also return iterators instead of lists if `iterate` is set to
     for song in client.playlistinfo():
         print song['file']
 
+Idle prefixed commands
+----------------------
+
 Each command have a *send\_<CMD>* and a *fetch\_<CMD>* variant, which allows to
 send a MPD command and then fetch the result later.
 This is useful for the idle command:
@@ -84,5 +100,54 @@ This is useful for the idle command:
     >>> gobject.io_add_watch(client, gobject.IO_IN, callback)
     >>> gobject.MainLoop().run()
 
+Fetching binary content (cover art)
+-----------------------------------
+
+Fetching album covers is possible with albumart, here is an example:
+
+.. code-block:: python
+
+    >>> cli = musicpd.MPDClient()
+    >>> cli.connect()
+    >>> track = "Steve Reich/1978-Music for 18 Musicians"
+    >>> aart = cli.albumart(track, 0)
+    >>> received = int(aart.get('binary'))
+    >>> size = int(aart.get('size'))
+    >>> with open('/tmp/cover', 'wb') as cover:
+    >>>     # aart = {'size': 42, 'binary': 2051, data: bytes(...)}
+    >>>     cover.write(aart.get('data'))
+    >>>     while received < size:
+    >>>         aart = cli.albumart(track, received)
+    >>>         cover.write(aart.get('data'))
+    >>>         received += int(aart.get('binary'))
+    >>>     if received != size:
+    >>>         print('something went wrong', file=sys.stderr)
+    >>> cli.disconnect()
+
+A `CommandError` is raised if the album does not expose a cover.
+
+You can also use `readpicture` command to fetch embedded picture:
+
+.. code-block:: python
+
+    >>> cli = musicpd.MPDClient()
+    >>> cli.connect()
+    >>> track = 'muse/Amon Tobin/2011-ISAM/01-Amon Tobin - Journeyman.mp3'
+    >>> rpict = cli.readpicture(track, 0)
+    >>> if not rpict:
+    >>>     print('No embedded picture found', file=sys.stderr)
+    >>>     sys.exit(1)
+    >>> size = int(rpict['size'])
+    >>> done = int(rpict['binary'])
+    >>> with open('/tmp/cover', 'wb') as cover:
+    >>>     cover.write(rpict['data'])
+    >>>     while size > done:
+    >>>         rpict = cli.readpicture(track, done)
+    >>>         done += int(rpict['binary'])
+    >>>         print(f'writing {rpict["binary"]}, done {100*done/size:03.0f}%')
+    >>>         cover.write(rpict['data'])
+    >>> cli.disconnect()
+
+Refer to `MPD protocol documentation`_ for the meaning of `binary`, `size` and `data`.
 
 .. _MPD protocol documentation: http://www.musicpd.org/doc/protocol/