1 files changed, 170 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/codecs/h264/h264.cc b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264.cc
new file mode 100644
index 0000000000..5b9f0338a9
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/codecs/h264/h264.cc
@@ -0,0 +1,170 @@
+/*
+ *  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 "modules/video_coding/codecs/h264/include/h264.h"
+
+#include <memory>
+#include <string>
+
+#include "absl/container/inlined_vector.h"
+#include "absl/types/optional.h"
+#include "api/video_codecs/sdp_video_format.h"
+#include "media/base/media_constants.h"
+#include "rtc_base/trace_event.h"
+
+#if defined(WEBRTC_USE_H264)
+#include "modules/video_coding/codecs/h264/h264_decoder_impl.h"
+#include "modules/video_coding/codecs/h264/h264_encoder_impl.h"
+#endif
+
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+namespace {
+
+#if defined(WEBRTC_USE_H264)
+bool g_rtc_use_h264 = true;
+#endif
+
+// If H.264 OpenH264/FFmpeg codec is supported.
+bool IsH264CodecSupported() {
+#if defined(WEBRTC_USE_H264)
+  return g_rtc_use_h264;
+#else
+  return false;
+#endif
+}
+
+constexpr ScalabilityMode kSupportedScalabilityModes[] = {
+    ScalabilityMode::kL1T1, ScalabilityMode::kL1T2, ScalabilityMode::kL1T3};
+
+}  // namespace
+
+SdpVideoFormat CreateH264Format(H264Profile profile,
+                                H264Level level,
+                                const std::string& packetization_mode,
+                                bool add_scalability_modes) {
+  const absl::optional<std::string> profile_string =
+      H264ProfileLevelIdToString(H264ProfileLevelId(profile, level));
+  RTC_CHECK(profile_string);
+  absl::InlinedVector<ScalabilityMode, kScalabilityModeCount> scalability_modes;
+  if (add_scalability_modes) {
+    for (const auto scalability_mode : kSupportedScalabilityModes) {
+      scalability_modes.push_back(scalability_mode);
+    }
+  }
+  return SdpVideoFormat(
+      cricket::kH264CodecName,
+      {{cricket::kH264FmtpProfileLevelId, *profile_string},
+       {cricket::kH264FmtpLevelAsymmetryAllowed, "1"},
+       {cricket::kH264FmtpPacketizationMode, packetization_mode}},
+      scalability_modes);
+}
+
+void DisableRtcUseH264() {
+#if defined(WEBRTC_USE_H264)
+  g_rtc_use_h264 = false;
+#endif
+}
+
+std::vector<SdpVideoFormat> SupportedH264Codecs(bool add_scalability_modes) {
+  TRACE_EVENT0("webrtc", __func__);
+  if (!IsH264CodecSupported())
+    return std::vector<SdpVideoFormat>();
+  // We only support encoding Constrained Baseline Profile (CBP), but the
+  // decoder supports more profiles. We can list all profiles here that are
+  // supported by the decoder and that are also supersets of CBP, i.e. the
+  // decoder for that profile is required to be able to decode CBP. This means
+  // we can encode and send CBP even though we negotiated a potentially
+  // higher profile. See the H264 spec for more information.
+  //
+  // We support both packetization modes 0 (mandatory) and 1 (optional,
+  // preferred).
+  return {CreateH264Format(H264Profile::kProfileBaseline, H264Level::kLevel3_1,
+                           "1", add_scalability_modes),
+          CreateH264Format(H264Profile::kProfileBaseline, H264Level::kLevel3_1,
+                           "0", add_scalability_modes),
+          CreateH264Format(H264Profile::kProfileConstrainedBaseline,
+                           H264Level::kLevel3_1, "1", add_scalability_modes),
+          CreateH264Format(H264Profile::kProfileConstrainedBaseline,
+                           H264Level::kLevel3_1, "0", add_scalability_modes),
+          CreateH264Format(H264Profile::kProfileMain, H264Level::kLevel3_1, "1",
+                           add_scalability_modes),
+          CreateH264Format(H264Profile::kProfileMain, H264Level::kLevel3_1, "0",
+                           add_scalability_modes)};
+}
+
+std::vector<SdpVideoFormat> SupportedH264DecoderCodecs() {
+  TRACE_EVENT0("webrtc", __func__);
+  if (!IsH264CodecSupported())
+    return std::vector<SdpVideoFormat>();
+
+  std::vector<SdpVideoFormat> supportedCodecs = SupportedH264Codecs();
+
+  // OpenH264 doesn't yet support High Predictive 4:4:4 encoding but it does
+  // support decoding.
+  supportedCodecs.push_back(CreateH264Format(
+      H264Profile::kProfilePredictiveHigh444, H264Level::kLevel3_1, "1"));
+  supportedCodecs.push_back(CreateH264Format(
+      H264Profile::kProfilePredictiveHigh444, H264Level::kLevel3_1, "0"));
+
+  return supportedCodecs;
+}
+
+std::unique_ptr<H264Encoder> H264Encoder::Create() {
+  return Create(cricket::CreateVideoCodec(cricket::kH264CodecName));
+}
+
+std::unique_ptr<H264Encoder> H264Encoder::Create(
+    const cricket::VideoCodec& codec) {
+  RTC_DCHECK(H264Encoder::IsSupported());
+#if defined(WEBRTC_USE_H264)
+  RTC_CHECK(g_rtc_use_h264);
+  RTC_LOG(LS_INFO) << "Creating H264EncoderImpl.";
+  return std::make_unique<H264EncoderImpl>(codec);
+#else
+  RTC_DCHECK_NOTREACHED();
+  return nullptr;
+#endif
+}
+
+bool H264Encoder::IsSupported() {
+  return IsH264CodecSupported();
+}
+
+bool H264Encoder::SupportsScalabilityMode(ScalabilityMode scalability_mode) {
+  for (const auto& entry : kSupportedScalabilityModes) {
+    if (entry == scalability_mode) {
+      return true;
+    }
+  }
+  return false;
+}
+
+std::unique_ptr<H264Decoder> H264Decoder::Create() {
+  RTC_DCHECK(H264Decoder::IsSupported());
+#if defined(WEBRTC_USE_H264)
+  RTC_CHECK(g_rtc_use_h264);
+  RTC_LOG(LS_INFO) << "Creating H264DecoderImpl.";
+  return std::make_unique<H264DecoderImpl>();
+#else
+  RTC_DCHECK_NOTREACHED();
+  return nullptr;
+#endif
+}
+
+bool H264Decoder::IsSupported() {
+  return IsH264CodecSupported();
+}
+
+}  // namespace webrtc