Add docs for --playready_extra_header_data.

Issue #756

Change-Id: Iedcf801c4c3e1e05e63857f3fe546ed2080c7005

docs/source/options/general_encryption_options.rst

@@ -43,3 +43,8 @@ General encryption options
     Protection systems to be generated. Supported protection systems include
     Widevine, PlayReady, FairPlay, Marlin, and
     `CommonSystem <https://goo.gl/s8RIhr>`_.
+
+--playready_extra_header_data <string>
+
+    Extra XML data to add to PlayReady PSSH data.  Can be specified even if
+    using another key source.

docs/source/tutorials/raw_key.rst

@@ -85,6 +85,20 @@ The examples below use the H264 streams created in :doc:`encoding`.
       --protection_systems Widevine,PlayReady \
       --mpd_output h264.mpd
 
+* Example with LAURL::
+
+    $ packager \
+      in=h264_baseline_360p_600.mp4,stream=audio,output=audio.mp4,drm_label=AUDIO \
+      in=h264_baseline_360p_600.mp4,stream=video,output=h264_360p.mp4,drm_label=SD \
+      in=h264_main_480p_1000.mp4,stream=video,output=h264_480p.mp4,drm_label=SD \
+      in=h264_main_720p_3000.mp4,stream=video,output=h264_720p.mp4,drm_label=HD \
+      in=h264_high_1080p_6000.mp4,stream=video,output=h264_1080p.mp4,drm_label=HD \
+      --enable_raw_key_encryption \
+      --keys label=AUDIO:key_id=f3c5e0361e6654b28f8049c778b23946:key=a4631a153a443df9eed0593043db7519,label=SD:key_id=abba271e8bcf552bbd2e86a434a9a5d9:key=69eaa802a6763af979e8d1940fb88392,label=HD:key_id=6d76f25cb17f5e16b8eaef6bbf582d8e:key=cb541084c99731aef4fff74500c12ead \
+      --protection_systems PlayReady \
+      --playready_extra_header_data '<LAURL>https://example.com/pr</LAURL>' \
+      --mpd_output h264.mpd
+
 .. note::
 
     Users are responsible for setting up the license servers and managing keys