Reland of Modify profiles for H264 encode SW fallback

webrtc/media/engine/videoencodersoftwarefallbackwrapper.cc

 /*
  *  Copyright (c) 2016 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/media/engine/videoencodersoftwarefallbackwrapper.h"
 
+#include "webrtc/media/base/h264_profile_level_id.h"
 #include "webrtc/media/engine/internalencoderfactory.h"
 #include "webrtc/modules/video_coding/include/video_error_codes.h"
 #include "webrtc/rtc_base/checks.h"
 #include "webrtc/rtc_base/logging.h"
 #include "webrtc/rtc_base/timeutils.h"
 #include "webrtc/system_wrappers/include/field_trial.h"
 
 namespace webrtc {
 namespace {
 const char kVp8ForceFallbackEncoderFieldTrial[] =
@@ skipping 59 matching lines @@
       callback_(nullptr),
       forced_fallback_possible_(EnableForcedFallback(codec)) {
   if (forced_fallback_possible_) {
     GetForcedFallbackParamsFromFieldTrialGroup(&forced_fallback_.low_kbps,
                                                &forced_fallback_.high_kbps,
                                                &forced_fallback_.min_low_ms);
   }
 }
 
 bool VideoEncoderSoftwareFallbackWrapper::InitFallbackEncoder() {
+  MaybeModifyCodecForFallback();
   cricket::InternalEncoderFactory internal_factory;
   if (!FindMatchingCodec(internal_factory.supported_codecs(), codec_)) {
     LOG(LS_WARNING)
         << "Encoder requesting fallback to codec not supported in software.";
     return false;
   }
   fallback_encoder_.reset(internal_factory.CreateVideoEncoder(codec_));
   if (fallback_encoder_->InitEncode(&codec_settings_, number_of_cores_,
                                     max_payload_size_) !=
       WEBRTC_VIDEO_CODEC_OK) {
@@ skipping 246 matching lines @@
   return false;
 }
 
 bool VideoEncoderSoftwareFallbackWrapper::ForcedFallbackParams::ShouldStop(
     uint32_t bitrate_kbps,
     const VideoCodec& codec) const {
   return bitrate_kbps >= high_kbps &&
          (codec.width * codec.height >= kMinPixelsStop);
 }
 
+void VideoEncoderSoftwareFallbackWrapper::MaybeModifyCodecForFallback() {
+  // We have a specific case for H264 ConstrainedBaseline because that is the
+  // only supported profile in Sw fallback.
+  if (!cricket::CodecNamesEq(codec_.name.c_str(), cricket::kH264CodecName))
+    return;
+  codec_.SetParam(cricket::kH264FmtpProfileLevelId,
+                  cricket::kH264ProfileLevelConstrainedBaseline);
+}
+
 }  // namespace webrtc