H.264 video codec support using OpenH264/FFmpeg

webrtc/modules/video_coding/codecs/h264/h264.cc

 /*
  *  Copyright (c) 2015 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.
  *
  */
 
 #include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
 
+#include "webrtc/modules/video_coding/codecs/h264/h264_encoder_impl.h"
+#include "webrtc/modules/video_coding/codecs/h264/h264_decoder_impl.h"
 #if defined(WEBRTC_IOS)
 #include "webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_decoder.h"
 #include "webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h"
 #endif
 
 #include "webrtc/base/checks.h"
 
 namespace webrtc {
 
 // We need this file to be C++ only so it will compile properly for all
 // platforms. In order to write ObjC specific implementations we use private
 // externs. This function is defined in h264.mm.
-#if defined(WEBRTC_IOS)
+#if defined(WEBRTC_IOS) && defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
 extern bool IsH264CodecSupportedObjC();
 #endif
 
 bool IsH264CodecSupported() {
-#if defined(WEBRTC_IOS)
-  return IsH264CodecSupportedObjC();
+#if defined(WEBRTC_IOS) && defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
+  if (IsH264CodecSupportedObjC()) {
+    return true;
+  }
 #else
-  return false;
+  // TODO(hbos): OpenH264 defines?
+  return true;
 #endif
 }
 
 H264Encoder* H264Encoder::Create() {
   DCHECK(H264Encoder::IsSupported());
 #if defined(WEBRTC_IOS) && defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
-  return new H264VideoToolboxEncoder();
+  if (IsH264CodecSupportedObjC()) {
+    return new H264VideoToolboxEncoder();
+  }
 #else
-  RTC_NOTREACHED();
-  return nullptr;
+  // TODO(hbos): OpenH264 defines?
+  return new H264EncoderImpl();
 #endif
 }
 
 bool H264Encoder::IsSupported() {
   return IsH264CodecSupported();
 }
 
 H264Decoder* H264Decoder::Create() {
   DCHECK(H264Decoder::IsSupported());
 #if defined(WEBRTC_IOS) && defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
-  return new H264VideoToolboxDecoder();
+  if (IsH264CodecSupportedObjC()) {
+    return new H264VideoToolboxDecoder();
+  }
 #else
-  RTC_NOTREACHED();
-  return nullptr;
+  // TODO(hbos): OpenH264 defines?
+  return new H264DecoderImpl();
 #endif
 }
 
 bool H264Decoder::IsSupported() {
   return IsH264CodecSupported();
 }
 
 }  // namespace webrtc