Adds new libcast_media shared library for cast_shell media

chromecast/media/media.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
+    'enable_default_cast_media%': 1,

[lcwu1, 2015/05/13 01:58:24]

nit: I would probably change the gyp var name slightly to
"use_default_libcast_media' because we are talking about the default
implementation of the shared library here, not the default implementation of
cma. (The latter appears to suggest that way.)

[halliwell, 2015/05/13 03:43:33]

I think I was going for consistency with the graphics variable, but I see your
point.

Maybe the right fix is to change as you suggest, and change graphics to be
consistent with media?  The question never arose for graphics because there was
no cast_graphics target.

+    'libcast_media_gyp%': '',

[gunsch, 2015/05/13 03:26:04]

I just noticed libcast_graphics does the same thing, but I'm not sure I like
this approach.

For example, I assume we'll have prebuilt .so files that aren't provided via gyp
files. But this assumes there will always be a gyp target pointing to a target
that provides the .so file. Can we find a way to get rid of that assumption?

[halliwell, 2015/05/13 03:43:33]

We should discuss for sure.  The challenge is with Marvell, where we want to
supply a vendor override shared lib, but we also want to build it all in our
build system, unlike other vendors who might override the shared lib externally.

Last time around with graphics, we discussed having a make file step that copied
the Marvell so to replace the default one.  But we concluded that would be extra
complexity and that just depending on their gyp target makes sense for now.

   },
   'targets': [
     {
       'target_name': 'media_base',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../crypto/crypto.gyp:crypto',
         '../../third_party/widevine/cdm/widevine_cdm.gyp:widevine_cdm_version_h',
+        '<(libcast_media_gyp):libcast_media_1.0',
       ],
       'sources': [
         'base/decrypt_context.cc',
         'base/decrypt_context.h',
         'base/decrypt_context_clearkey.cc',
         'base/decrypt_context_clearkey.h',
         'base/key_systems_common.cc',
         'base/key_systems_common.h',
         'base/media_caps.cc',
         'base/media_caps.h',
@@ skipping 259 matching lines @@
         'cma/test/frame_segmenter_for_test.h',
         'cma/test/media_component_device_feeder_for_test.cc',
         'cma/test/media_component_device_feeder_for_test.h',
         'cma/test/mock_frame_consumer.cc',
         'cma/test/mock_frame_consumer.h',
         'cma/test/mock_frame_provider.cc',
         'cma/test/mock_frame_provider.h',
         'cma/test/run_all_unittests.cc',
       ],
     },
+  ], # end of targets
+  'conditions': [
+    ['enable_default_cast_media==1', {
+      'targets': [
+        {
+          'target_name': 'libcast_media_1.0',
+          'type': 'shared_library',
+          'dependencies': [
+            '../../chromecast/chromecast.gyp:cast_public_api'
+          ],
+          'include_dirs': [
+            '../..',
+          ],
+          'sources': [
+            'base/cast_media_default.cc',
+          ],
+        }
+      ]
+    }],
   ],
 }