1 files changed, 114 insertions, 0 deletions
diff --git a/third_party/libwebrtc/media/engine/multiplex_codec_factory.cc b/third_party/libwebrtc/media/engine/multiplex_codec_factory.cc
new file mode 100644
index 0000000000..90df02a77e
--- /dev/null
+++ b/third_party/libwebrtc/media/engine/multiplex_codec_factory.cc
@@ -0,0 +1,114 @@
+/*
+ *  Copyright (c) 2017 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 "media/engine/multiplex_codec_factory.h"
+
+#include <map>
+#include <string>
+#include <utility>
+
+#include "absl/strings/match.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "media/base/codec.h"
+#include "media/base/media_constants.h"
+#include "modules/video_coding/codecs/multiplex/include/multiplex_decoder_adapter.h"
+#include "modules/video_coding/codecs/multiplex/include/multiplex_encoder_adapter.h"
+#include "rtc_base/logging.h"
+
+namespace {
+
+bool IsMultiplexCodec(const cricket::VideoCodec& codec) {
+  return absl::EqualsIgnoreCase(codec.name.c_str(),
+                                cricket::kMultiplexCodecName);
+}
+
+}  // anonymous namespace
+
+namespace webrtc {
+
+constexpr const char* kMultiplexAssociatedCodecName = cricket::kVp9CodecName;
+
+MultiplexEncoderFactory::MultiplexEncoderFactory(
+    std::unique_ptr<VideoEncoderFactory> factory,
+    bool supports_augmenting_data)
+    : factory_(std::move(factory)),
+      supports_augmenting_data_(supports_augmenting_data) {}
+
+std::vector<SdpVideoFormat> MultiplexEncoderFactory::GetSupportedFormats()
+    const {
+  std::vector<SdpVideoFormat> formats = factory_->GetSupportedFormats();
+  for (const auto& format : formats) {
+    if (absl::EqualsIgnoreCase(format.name, kMultiplexAssociatedCodecName)) {
+      SdpVideoFormat multiplex_format = format;
+      multiplex_format.parameters[cricket::kCodecParamAssociatedCodecName] =
+          format.name;
+      multiplex_format.name = cricket::kMultiplexCodecName;
+      formats.push_back(multiplex_format);
+      break;
+    }
+  }
+  return formats;
+}
+
+std::unique_ptr<VideoEncoder> MultiplexEncoderFactory::CreateVideoEncoder(
+    const SdpVideoFormat& format) {
+  if (!IsMultiplexCodec(cricket::CreateVideoCodec(format)))
+    return factory_->CreateVideoEncoder(format);
+  const auto& it =
+      format.parameters.find(cricket::kCodecParamAssociatedCodecName);
+  if (it == format.parameters.end()) {
+    RTC_LOG(LS_ERROR) << "No assicated codec for multiplex.";
+    return nullptr;
+  }
+  SdpVideoFormat associated_format = format;
+  associated_format.name = it->second;
+  return std::unique_ptr<VideoEncoder>(new MultiplexEncoderAdapter(
+      factory_.get(), associated_format, supports_augmenting_data_));
+}
+
+MultiplexDecoderFactory::MultiplexDecoderFactory(
+    std::unique_ptr<VideoDecoderFactory> factory,
+    bool supports_augmenting_data)
+    : factory_(std::move(factory)),
+      supports_augmenting_data_(supports_augmenting_data) {}
+
+std::vector<SdpVideoFormat> MultiplexDecoderFactory::GetSupportedFormats()
+    const {
+  std::vector<SdpVideoFormat> formats = factory_->GetSupportedFormats();
+  std::vector<SdpVideoFormat> augmented_formats = formats;
+  for (const auto& format : formats) {
+    if (absl::EqualsIgnoreCase(format.name, kMultiplexAssociatedCodecName)) {
+      SdpVideoFormat multiplex_format = format;
+      multiplex_format.parameters[cricket::kCodecParamAssociatedCodecName] =
+          format.name;
+      multiplex_format.name = cricket::kMultiplexCodecName;
+      augmented_formats.push_back(multiplex_format);
+    }
+  }
+  return augmented_formats;
+}
+
+std::unique_ptr<VideoDecoder> MultiplexDecoderFactory::CreateVideoDecoder(
+    const SdpVideoFormat& format) {
+  if (!IsMultiplexCodec(cricket::CreateVideoCodec(format)))
+    return factory_->CreateVideoDecoder(format);
+  const auto& it =
+      format.parameters.find(cricket::kCodecParamAssociatedCodecName);
+  if (it == format.parameters.end()) {
+    RTC_LOG(LS_ERROR) << "No assicated codec for multiplex.";
+    return nullptr;
+  }
+  SdpVideoFormat associated_format = format;
+  associated_format.name = it->second;
+  return std::unique_ptr<VideoDecoder>(new MultiplexDecoderAdapter(
+      factory_.get(), associated_format, supports_augmenting_data_));
+}
+
+}  // namespace webrtc