New interface (AudioDecoderFactory), with an implementation

webrtc/modules/audio_coding/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("../../build/webrtc.gni")
@@ skipping 21 matching lines @@
     audio_codec_deps += [ ":isac" ]
   }
   audio_codec_defines += [ "WEBRTC_CODEC_G722" ]
   audio_codec_deps += [ ":g722" ]
 }
 if (!build_with_mozilla && !build_with_chromium) {
   audio_codec_defines += [ "WEBRTC_CODEC_RED" ]
   audio_codec_deps += [ ":red" ]
 }
 
+source_set("audio_codec_factory_interfaces") {
+  sources = [
+    "codecs/audio_decoder_factory.h",
+    "codecs/audio_format.cc",
+    "codecs/audio_format.h",
+  ]
+  configs += [ "../..:common_config" ]
+  public_configs = [ "../..:common_inherited_config" ]
+  deps = [
+    "../..:webrtc_common",
+  ]
+}
+
+source_set("builtin_audio_codec_factory") {

[the sun, 2016/04/27 20:34:14]

_factories?

Or is the intent to have a single class implementing both enc and dec factory?

[kwiberg-webrtc, 2016/04/28 12:35:51]

Changed this to "builtin_audio_decoder_factory" for now. We can change it to
"builtin_audio_codec_factories" if and when we put the encoder factory in here
too.

+  sources = [
+    "codecs/builtin_audio_decoder_factory.cc",
+    "codecs/builtin_audio_decoder_factory.h",
+  ]
+  configs += [ "../..:common_config" ]
+  public_configs = [ "../..:common_inherited_config" ]
+  deps = [
+           "../..:webrtc_common",
+           ":audio_codec_factory_interfaces",
+         ] + audio_codec_deps
+  defines = audio_codec_defines
+}
+
 source_set("rent_a_codec") {
   sources = [
     "acm2/acm_codec_database.cc",
     "acm2/acm_codec_database.h",
     "acm2/rent_a_codec.cc",
     "acm2/rent_a_codec.h",
   ]
   configs += [ "../..:common_config" ]
   public_configs = [ "../..:common_inherited_config" ]
   deps = [ "../..:webrtc_common" ] + audio_codec_deps
@@ skipping 795 matching lines @@
       defines += [ "WEBRTC_CODEC_ISACFX" ]
       deps += [ ":isac_fix" ]
     } else {
       defines += [ "WEBRTC_CODEC_ISAC" ]
       deps += [ ":isac" ]
     }
     defines += [ "WEBRTC_CODEC_G722" ]
     deps += [ ":g722" ]
   }
 }