Jorge E. Moreira | c87c2c7 | 2019-03-06 16:12:23 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "host/frontend/vnc_server/screen_connector.h" |
| 18 | |
| 19 | #include <atomic> |
| 20 | #include <condition_variable> |
| 21 | |
| 22 | #include <gflags/gflags.h> |
| 23 | |
| 24 | #include <common/vsoc/lib/screen_region_view.h> |
| 25 | #include <host/libs/config/cuttlefish_config.h> |
| 26 | #include "host/frontend/vnc_server/vnc_utils.h" |
| 27 | |
| 28 | DEFINE_int32(frame_server_fd, -1, ""); |
| 29 | |
| 30 | namespace cvd { |
| 31 | namespace vnc { |
| 32 | |
| 33 | namespace { |
| 34 | class VSoCScreenConnector : public ScreenConnector { |
| 35 | public: |
| 36 | int WaitForNewFrameSince(std::uint32_t* seq_num) override { |
| 37 | if (!screen_view_) return -1; |
| 38 | return screen_view_->WaitForNewFrameSince(seq_num); |
| 39 | } |
| 40 | |
| 41 | void* GetBuffer(int buffer_idx) override { |
| 42 | if (!screen_view_) return nullptr; |
| 43 | return screen_view_->GetBuffer(buffer_idx); |
| 44 | } |
| 45 | |
| 46 | private: |
| 47 | vsoc::screen::ScreenRegionView* screen_view_ = |
| 48 | vsoc::screen::ScreenRegionView::GetInstance(vsoc::GetDomain().c_str()); |
| 49 | }; |
| 50 | |
| 51 | // TODO(b/128852363): Substitute with one based on memory shared with the |
| 52 | // wayland mock |
| 53 | class SocketBasedScreenConnector : public ScreenConnector { |
| 54 | public: |
| 55 | SocketBasedScreenConnector(vsoc::CuttlefishConfig* config) : config_(config) { |
| 56 | screen_server_thread_ = std::thread([this]() { ServerLoop(); }); |
| 57 | } |
| 58 | |
| 59 | int WaitForNewFrameSince(std::uint32_t* seq_num) override { |
| 60 | std::unique_lock<std::mutex> lock(new_frame_mtx_); |
| 61 | while (seq_num_ == *seq_num) { |
| 62 | new_frame_cond_var_.wait(lock); |
| 63 | } |
| 64 | return newest_buffer_; |
| 65 | } |
| 66 | |
| 67 | void* GetBuffer(int buffer_idx) override { |
| 68 | if (buffer_idx < 0) return nullptr; |
| 69 | buffer_idx %= NUM_BUFFERS_; |
| 70 | return &buffer_[buffer_idx * ScreenSizeInBytes()]; |
| 71 | } |
| 72 | |
| 73 | private: |
| 74 | static constexpr int NUM_BUFFERS_ = 4; |
| 75 | |
| 76 | void ServerLoop() { |
| 77 | if (FLAGS_frame_server_fd < 0) { |
| 78 | LOG(FATAL) << "Invalid file descriptor: " << FLAGS_frame_server_fd; |
| 79 | return; |
| 80 | } |
| 81 | auto server = SharedFD::Dup(FLAGS_frame_server_fd); |
| 82 | close(FLAGS_frame_server_fd); |
| 83 | if (!server->IsOpen()) { |
| 84 | LOG(FATAL) << "Unable to dup screen server: " << server->StrError(); |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | int current_buffer = 0; |
| 89 | |
| 90 | while (1) { |
| 91 | auto conn = SharedFD::Accept(*server); |
| 92 | while (conn->IsOpen()) { |
| 93 | SendScreenParameters(conn); |
| 94 | |
| 95 | int32_t size = 0; |
| 96 | conn->Read(&size, sizeof(size)); |
| 97 | auto buff = reinterpret_cast<uint8_t*>(GetBuffer(current_buffer)); |
| 98 | while (size > 0) { |
| 99 | auto read = conn->Read(buff, size); |
| 100 | if (read < 0) { |
| 101 | LOG(ERROR) << "Failed to read from hwcomposer: " |
| 102 | << conn->StrError(); |
| 103 | return; |
| 104 | } |
| 105 | size -= read; |
| 106 | buff += read; |
| 107 | } |
| 108 | BroadcastNewFrame(current_buffer); |
| 109 | current_buffer = (current_buffer + 1) % NUM_BUFFERS_; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | void SendScreenParameters(SharedFD conn) const { |
| 115 | // TODO(b/128842613): Send this info from the configuration server |
| 116 | int32_t screen_params[4]; |
| 117 | screen_params[0] = config_->x_res(); |
| 118 | screen_params[1] = config_->y_res(); |
| 119 | screen_params[2] = config_->dpi(); |
| 120 | screen_params[3] = config_->refresh_rate_hz(); |
| 121 | int buff_size = sizeof(screen_params); |
| 122 | int res = conn->Write(screen_params, buff_size); |
| 123 | if (res != buff_size) { |
| 124 | LOG(FATAL) |
| 125 | << "Unable to send full screen parameters to the hwcomposer (" |
| 126 | << res << "): " << conn->StrError(); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | void BroadcastNewFrame(int buffer_idx) { |
| 131 | { |
| 132 | std::lock_guard<std::mutex> lock(new_frame_mtx_); |
| 133 | seq_num_++; |
| 134 | newest_buffer_ = buffer_idx; |
| 135 | } |
| 136 | new_frame_cond_var_.notify_all(); |
| 137 | } |
| 138 | |
| 139 | vsoc::CuttlefishConfig* config_; |
| 140 | std::vector<std::uint8_t> buffer_ = |
| 141 | std::vector<std::uint8_t>(NUM_BUFFERS_ * ScreenSizeInBytes()); |
| 142 | std::uint32_t seq_num_{0}; |
| 143 | int newest_buffer_ = 0; |
| 144 | std::condition_variable new_frame_cond_var_; |
| 145 | std::mutex new_frame_mtx_; |
| 146 | std::thread screen_server_thread_; |
| 147 | }; |
| 148 | } // namespace |
| 149 | |
| 150 | ScreenConnector* ScreenConnector::Get() { |
| 151 | auto config = vsoc::CuttlefishConfig::Get(); |
| 152 | if (config->enable_ivserver()) { |
| 153 | return new VSoCScreenConnector(); |
| 154 | } else { |
| 155 | return new SocketBasedScreenConnector(config); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | } // namespace vnc |
| 160 | } // namespace cvd |