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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cast/streaming/answer_messages.h"
#include <utility>
#include "absl/strings/str_cat.h"
#include "cast/streaming/message_util.h"
#include "platform/base/error.h"
#include "util/logging.h"
namespace openscreen {
namespace cast {
namespace {
static constexpr char kMessageKeyType[] = "type";
static constexpr char kMessageTypeAnswer[] = "ANSWER";
// List of ANSWER message fields.
static constexpr char kAnswerMessageBody[] = "answer";
static constexpr char kResult[] = "result";
static constexpr char kResultOk[] = "ok";
static constexpr char kResultError[] = "error";
static constexpr char kErrorMessageBody[] = "error";
static constexpr char kErrorCode[] = "code";
static constexpr char kErrorDescription[] = "description";
Json::Value AspectRatioConstraintToJson(AspectRatioConstraint aspect_ratio) {
switch (aspect_ratio) {
case AspectRatioConstraint::kVariable:
return Json::Value("receiver");
case AspectRatioConstraint::kFixed:
default:
return Json::Value("sender");
}
}
template <typename T>
Json::Value PrimitiveVectorToJson(const std::vector<T>& vec) {
Json::Value array(Json::ValueType::arrayValue);
array.resize(vec.size());
for (Json::Value::ArrayIndex i = 0; i < vec.size(); ++i) {
array[i] = Json::Value(vec[i]);
}
return array;
}
} // namespace
ErrorOr<Json::Value> AudioConstraints::ToJson() const {
if (max_sample_rate <= 0 || max_channels <= 0 || min_bit_rate <= 0 ||
max_bit_rate < min_bit_rate) {
return CreateParameterError("AudioConstraints");
}
Json::Value root;
root["maxSampleRate"] = max_sample_rate;
root["maxChannels"] = max_channels;
root["minBitRate"] = min_bit_rate;
root["maxBitRate"] = max_bit_rate;
root["maxDelay"] = Json::Value::Int64(max_delay.count());
return root;
}
ErrorOr<Json::Value> Dimensions::ToJson() const {
if (width <= 0 || height <= 0 || frame_rate_denominator <= 0 ||
frame_rate_numerator <= 0) {
return CreateParameterError("Dimensions");
}
Json::Value root;
root["width"] = width;
root["height"] = height;
if (frame_rate_denominator > 1) {
root["frameRate"] =
absl::StrCat(frame_rate_numerator, "/", frame_rate_denominator);
} else {
root["frameRate"] = std::to_string(frame_rate_numerator);
}
return root;
}
ErrorOr<Json::Value> VideoConstraints::ToJson() const {
if (max_pixels_per_second <= 0 || min_bit_rate <= 0 ||
max_bit_rate < min_bit_rate || max_delay.count() <= 0) {
return CreateParameterError("VideoConstraints");
}
auto error_or_min_dim = min_dimensions.ToJson();
if (error_or_min_dim.is_error()) {
return error_or_min_dim.error();
}
auto error_or_max_dim = max_dimensions.ToJson();
if (error_or_max_dim.is_error()) {
return error_or_max_dim.error();
}
Json::Value root;
root["maxPixelsPerSecond"] = max_pixels_per_second;
root["minDimensions"] = error_or_min_dim.value();
root["maxDimensions"] = error_or_max_dim.value();
root["minBitRate"] = min_bit_rate;
root["maxBitRate"] = max_bit_rate;
root["maxDelay"] = Json::Value::Int64(max_delay.count());
return root;
}
ErrorOr<Json::Value> Constraints::ToJson() const {
auto audio_or_error = audio.ToJson();
if (audio_or_error.is_error()) {
return audio_or_error.error();
}
auto video_or_error = video.ToJson();
if (video_or_error.is_error()) {
return video_or_error.error();
}
Json::Value root;
root["audio"] = audio_or_error.value();
root["video"] = video_or_error.value();
return root;
}
ErrorOr<Json::Value> DisplayDescription::ToJson() const {
if (aspect_ratio.width < 1 || aspect_ratio.height < 1) {
return CreateParameterError("DisplayDescription");
}
auto dimensions_or_error = dimensions.ToJson();
if (dimensions_or_error.is_error()) {
return dimensions_or_error.error();
}
Json::Value root;
root["dimensions"] = dimensions_or_error.value();
root["aspectRatio"] =
absl::StrCat(aspect_ratio.width, ":", aspect_ratio.height);
root["scaling"] = AspectRatioConstraintToJson(aspect_ratio_constraint);
return root;
}
ErrorOr<Json::Value> Answer::ToJson() const {
if (udp_port <= 0 || udp_port > 65535) {
return CreateParameterError("Answer - UDP Port number");
}
Json::Value root;
if (constraints) {
auto constraints_or_error = constraints.value().ToJson();
if (constraints_or_error.is_error()) {
return constraints_or_error.error();
}
root["constraints"] = constraints_or_error.value();
}
if (display) {
auto display_or_error = display.value().ToJson();
if (display_or_error.is_error()) {
return display_or_error.error();
}
root["display"] = display_or_error.value();
}
root["castMode"] = cast_mode.ToString();
root["udpPort"] = udp_port;
root["sendIndexes"] = PrimitiveVectorToJson(send_indexes);
root["ssrcs"] = PrimitiveVectorToJson(ssrcs);
root["receiverRtcpEventLog"] = PrimitiveVectorToJson(receiver_rtcp_event_log);
root["receiverRtcpDscp"] = PrimitiveVectorToJson(receiver_rtcp_dscp);
root["receiverGetStatus"] = supports_wifi_status_reporting;
root["rtpExtensions"] = PrimitiveVectorToJson(rtp_extensions);
return root;
}
Json::Value Answer::ToAnswerMessage() const {
auto json_or_error = ToJson();
if (json_or_error.is_error()) {
return CreateInvalidAnswer(json_or_error.error());
}
Json::Value message_root;
message_root[kMessageKeyType] = kMessageTypeAnswer;
message_root[kAnswerMessageBody] = std::move(json_or_error.value());
message_root[kResult] = kResultOk;
return message_root;
}
Json::Value CreateInvalidAnswer(Error error) {
Json::Value message_root;
message_root[kMessageKeyType] = kMessageTypeAnswer;
message_root[kResult] = kResultError;
message_root[kErrorMessageBody][kErrorCode] = static_cast<int>(error.code());
message_root[kErrorMessageBody][kErrorDescription] = error.message();
return message_root;
}
} // namespace cast
} // namespace openscreen
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