[EXPERIMENTAL] Generic stereo codec with index header sending merged frames

webrtc/modules/video_coding/codecs/stereo/stereo_decoder_adapter.cc

Index: webrtc/modules/video_coding/codecs/stereo/stereo_decoder_adapter.cc
diff --git a/webrtc/modules/video_coding/codecs/stereo/stereo_decoder_adapter.cc b/webrtc/modules/video_coding/codecs/stereo/stereo_decoder_adapter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..70415f25348c0b72e2aa765d3c59b5c895e1f7cb
--- /dev/null
+++ b/webrtc/modules/video_coding/codecs/stereo/stereo_decoder_adapter.cc
@@ -0,0 +1,201 @@
+/*
+ *  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 "webrtc/modules/video_coding/codecs/stereo/include/stereo_decoder_adapter.h"
+
+#include "webrtc/api/video/i420_buffer.h"
+#include "webrtc/base/keep_ref_until_done.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/common_video/include/video_frame.h"
+#include "webrtc/common_video/include/video_frame_buffer.h"
+#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
+
+namespace webrtc {
+
+class StereoDecoderAdapter::AdapterDecodedImageCallback
+    : public webrtc::DecodedImageCallback {
+ public:
+  AdapterDecodedImageCallback(webrtc::StereoDecoderAdapter* adapter,
+                              StereoCodecStream stream_idx)
+      : adapter_(adapter), stream_idx_(stream_idx) {}
+
+  void Decoded(VideoFrame& decodedImage,
+               rtc::Optional<int32_t> decode_time_ms,
+               rtc::Optional<uint8_t> qp) override {
+    if (!adapter_)
+      return;
+    adapter_->Decoded(stream_idx_, decodedImage, decode_time_ms, qp);
+  }
+  int32_t Decoded(VideoFrame& decodedImage) override {
+    RTC_NOTREACHED();
+    return WEBRTC_VIDEO_CODEC_OK;
+  }
+  int32_t Decoded(VideoFrame& decodedImage, int64_t decode_time_ms) override {
+    RTC_NOTREACHED();
+    return WEBRTC_VIDEO_CODEC_OK;
+  }
+
+ private:
+  StereoDecoderAdapter* adapter_;
+  const StereoCodecStream stream_idx_;
+};
+
+struct StereoDecoderAdapter::DecodedImageData {
+  explicit DecodedImageData(StereoCodecStream stream_idx)
+      : stream_idx_(stream_idx),
+        decodedImage_(I420Buffer::Create(1 /* width */, 1 /* height */),
+                      0,
+                      0,
+                      kVideoRotation_0) {
+    RTC_DCHECK_EQ(kAXXStream, stream_idx);
+  }
+  DecodedImageData(StereoCodecStream stream_idx,
+                   const VideoFrame& decodedImage,
+                   const rtc::Optional<int32_t>& decode_time_ms,
+                   const rtc::Optional<uint8_t>& qp)
+      : stream_idx_(stream_idx),
+        decodedImage_(decodedImage),
+        decode_time_ms_(decode_time_ms),
+        qp_(qp) {}
+  const StereoCodecStream stream_idx_;
+  VideoFrame decodedImage_;
+  const rtc::Optional<int32_t> decode_time_ms_;
+  const rtc::Optional<uint8_t> qp_;
+
+ private:
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DecodedImageData);
+};
+
+StereoDecoderAdapter::StereoDecoderAdapter(VideoDecoderFactory* factory)
+    : factory_(factory) {}
+
+StereoDecoderAdapter::~StereoDecoderAdapter() {
+  Release();
+}
+
+int32_t StereoDecoderAdapter::InitDecode(const VideoCodec* codec_settings,
+                                        int32_t number_of_cores) {
+  VideoCodec settings = *codec_settings;
+  settings.codecType = kVideoCodecVP9;
+  for (size_t i = 0; i < kStereoCodecStreams; ++i) {
+    VideoDecoder* decoder = factory_->Create();
+    const int32_t rv = decoder->InitDecode(&settings, number_of_cores);
+    if (rv)
+      return rv;
+    decoders_.push_back(decoder);
+    adapter_callbacks_.emplace_back(
+        new StereoDecoderAdapter::AdapterDecodedImageCallback(
+            this, static_cast<StereoCodecStream>(i)));
+    decoder->RegisterDecodeCompleteCallback(adapter_callbacks_.back().get());
+  }
+  return WEBRTC_VIDEO_CODEC_OK;
+}
+
+int32_t StereoDecoderAdapter::Decode(
+    const EncodedImage& input_image,
+    bool missing_frames,
+    const RTPFragmentationHeader* /*fragmentation*/,
+    const CodecSpecificInfo* codec_specific_info,
+    int64_t render_time_ms) {
+  LOG(LS_ERROR) << __func__;
+  LOG(LS_ERROR) << __func__
+                << static_cast<int>(codec_specific_info->stereoInfo.num_frames);
+  if (codec_specific_info->stereoInfo.num_frames == 0) {
+    RTC_DCHECK(decoded_data_.find(input_image._timeStamp) ==
+               decoded_data_.end());
+    decoded_data_.emplace(std::piecewise_construct,
+                          std::forward_as_tuple(input_image._timeStamp),
+                          std::forward_as_tuple(kAXXStream));
+  }
+
+  int32_t rv =
+      decoders_[kYUVStream]->Decode(input_image, missing_frames, nullptr,
+                                    codec_specific_info, render_time_ms);
+
+  rv &= decoders_[kAXXStream]->Decode(
+      *codec_specific_info->stereoInfo.encoded_images[0], missing_frames,
+      nullptr, codec_specific_info->stereoInfo.codec_specific_infos[0],
+      render_time_ms);
+  return rv;
+}
+
+int32_t StereoDecoderAdapter::RegisterDecodeCompleteCallback(
+    DecodedImageCallback* callback) {
+  decoded_complete_callback_ = callback;
+  return WEBRTC_VIDEO_CODEC_OK;
+}
+
+int32_t StereoDecoderAdapter::Release() {
+  for (auto decoder : decoders_) {
+    const int32_t rv = decoder->Release();
+    if (rv)
+      return rv;
+    factory_->Destroy(decoder);
+  }
+  decoders_.clear();
+  adapter_callbacks_.clear();
+  return WEBRTC_VIDEO_CODEC_OK;
+}
+
+void StereoDecoderAdapter::Decoded(StereoCodecStream stream_idx,
+                                   VideoFrame& decoded_image,
+                                   rtc::Optional<int32_t> decode_time_ms,
+                                   rtc::Optional<uint8_t> qp) {
+  const auto& other_decoded_data_it =
+      decoded_data_.find(decoded_image.timestamp());
+  if (other_decoded_data_it != decoded_data_.end()) {
+    auto& other_image_data = other_decoded_data_it->second;
+    if (stream_idx == kYUVStream) {
+      RTC_DCHECK_EQ(kAXXStream, other_image_data.stream_idx_);
+      MergeDecodedImages(
+          decoded_image, decode_time_ms, qp, other_image_data.decodedImage_,
+          other_image_data.decode_time_ms_, other_image_data.qp_);
+    } else {
+      RTC_DCHECK_EQ(kYUVStream, other_image_data.stream_idx_);
+      RTC_DCHECK_EQ(kAXXStream, stream_idx);
+      MergeDecodedImages(other_image_data.decodedImage_,
+                         other_image_data.decode_time_ms_, other_image_data.qp_,
+                         decoded_image, decode_time_ms, qp);
+    }
+    decoded_data_.erase(decoded_data_.begin(), other_decoded_data_it);
+    return;
+  }
+  RTC_DCHECK(decoded_data_.find(decoded_image.timestamp()) ==
+             decoded_data_.end());
+  decoded_data_.emplace(
+      std::piecewise_construct,
+      std::forward_as_tuple(decoded_image.timestamp()),
+      std::forward_as_tuple(stream_idx, decoded_image, decode_time_ms, qp));
+}
+
+void StereoDecoderAdapter::MergeDecodedImages(
+    VideoFrame& decodedImage,
+    const rtc::Optional<int32_t>& decode_time_ms,
+    const rtc::Optional<uint8_t>& qp,
+    VideoFrame& alpha_decodedImage,
+    const rtc::Optional<int32_t>& stereo_decode_time_ms,
+    const rtc::Optional<uint8_t>& stereo_qp) {
+  if (!alpha_decodedImage.timestamp()) {
+    decoded_complete_callback_->Decoded(decodedImage, decode_time_ms, qp);
+    return;
+  }
+  rtc::scoped_refptr<webrtc::I420BufferInterface> alpha_buffer =
+      alpha_decodedImage.video_frame_buffer()->ToI420();
+  rtc::scoped_refptr<WrappedI420ABuffer> wrapped_buffer(
+      new rtc::RefCountedObject<webrtc::WrappedI420ABuffer>(
+          decodedImage.video_frame_buffer(), alpha_buffer->DataY(),
+          alpha_buffer->StrideY(),
+          rtc::KeepRefUntilDone(alpha_decodedImage.video_frame_buffer())));
+  VideoFrame wrapped_image(wrapped_buffer, decodedImage.timestamp(),
+                           0 /* render_time_ms */, decodedImage.rotation());
+  decoded_complete_callback_->Decoded(wrapped_image, decode_time_ms, qp);
+}
+
+}  // namespace webrtc