add a use_alsa gyp setting

media/media.gyp

 # Copyright (c) 2012 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,
     # Override to dynamically link the PulseAudio library.
     'use_pulseaudio%': 0,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     'conditions': [
       ['OS == "android" or OS == "ios"', {
         # Android and iOS don't use ffmpeg.
         'use_ffmpeg%': 0,
         # Android and iOS don't use libvpx.
         'use_libvpx%': 0,
       }, {  # 'OS != "android" and OS != "ios"'
         'use_ffmpeg%': 1,
         'use_libvpx%': 1,
       }],
       # Screen capturer works only on Windows, OSX and Linux.
       ['OS=="win" or OS=="mac" or OS=="linux"', {
         'screen_capture_supported%': 1,
       }, {
         'screen_capture_supported%': 0,
       }],
+      # ALSA usage.
+      ['OS=="linux" or OS=="freebsd" or OS=="solaris"', {
+        'use_alsa%': 1,
+      }, {
+        'use_alsa%': 0,
+      }],
     ],
   },
   'targets': [
     {
       'target_name': 'media',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../build/temp_gyp/googleurl.gyp:googleurl',
         '../crypto/crypto.gyp:crypto',
@@ skipping 505 matching lines @@
             '../third_party/libvpx/libvpx.gyp:libvpx',
             '../third_party/libyuv/libyuv.gyp:libyuv',
           ],
           'sources': [
             'webm/chromeos/ebml_writer.cc',
             'webm/chromeos/ebml_writer.h',
             'webm/chromeos/webm_encoder.cc',
             'webm/chromeos/webm_encoder.h',
           ],
         }],
-        ['OS=="linux" or OS=="freebsd" or OS=="solaris"', {
+        ['use_alsa==1', {

[DaleCurtis, 2013/02/21 20:57:29]

Long term, ideally, I'd like to get rid of all the use_alsa, use_cras, use_pulse
flags and just dlsym the libraries at runtime instead.

OOC what output driver are you using if not Alsa? Pulse, CrAS, something else?

           'link_settings': {
             'libraries': [
               '-lasound',
             ],
           },
-        }],
-        ['OS=="openbsd"', {
+        }, { # use_alsa==0
           'sources/': [ ['exclude', '/alsa_' ],
-                        ['exclude', '/audio_manager_linux' ] ],
-          'link_settings': {
-            'libraries': [
-            ],
-          },
+                      ['exclude', '/audio_manager_linux' ] ],
         }],
         ['OS!="openbsd"', {
           'sources!': [
             'audio/openbsd/audio_manager_openbsd.cc',
             'audio/openbsd/audio_manager_openbsd.h',
           ],
         }],
         ['OS=="linux"', {
           'variables': {
             'conditions': [
@@ skipping 359 matching lines @@
               'sources': [
                 'audio/cras/cras_input_unittest.cc',
                 'audio/cras/cras_output_unittest.cc',
               ],
               'defines': [
                 'USE_CRAS',
               ],
             }],
           ],
         }],
+        ['use_alsa==0', {
+          'sources!': [
+            'audio/linux/alsa_output_unittest.cc',
+            'audio/audio_low_latency_input_output_unittest.cc',
+          ],
+        }],
         [ 'target_arch=="ia32" or target_arch=="x64"', {
           'sources': [
             'base/simd/convert_rgb_to_yuv_unittest.cc',
           ],
         }],
         [ 'screen_capture_supported == 0', {
           'sources/': [
             ['exclude', '^video/capture/screen/'],
           ],
         }],
@@ skipping 551 matching lines @@
           ],
           'sources': [
             'video/capture/screen/differ_block_sse2.cc',
             'video/capture/screen/differ_block_sse2.h',
           ],
         }, # end of target differ_block_sse2
       ],
     }],
   ],
 }