Nagram/TMessagesProj/jni/webrtc/media/base/sdp_fmtp_utils.cc
2020-08-14 19:58:22 +03:00

56 lines
1.7 KiB
C++

/*
* Copyright (c) 2019 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/base/sdp_fmtp_utils.h"
#include <map>
#include <utility>
#include "rtc_base/string_to_number.h"
namespace webrtc {
namespace {
// Max frame rate for VP8 and VP9 video.
const char kVPxFmtpMaxFrameRate[] = "max-fr";
// Max frame size for VP8 and VP9 video.
const char kVPxFmtpMaxFrameSize[] = "max-fs";
const int kVPxFmtpFrameSizeSubBlockPixels = 256;
absl::optional<int> ParsePositiveNumberFromParams(
const SdpVideoFormat::Parameters& params,
const char* parameter_name) {
const auto max_frame_rate_it = params.find(parameter_name);
if (max_frame_rate_it == params.end())
return absl::nullopt;
const absl::optional<int> i =
rtc::StringToNumber<int>(max_frame_rate_it->second);
if (!i.has_value() || i.value() <= 0)
return absl::nullopt;
return i;
}
} // namespace
absl::optional<int> ParseSdpForVPxMaxFrameRate(
const SdpVideoFormat::Parameters& params) {
return ParsePositiveNumberFromParams(params, kVPxFmtpMaxFrameRate);
}
absl::optional<int> ParseSdpForVPxMaxFrameSize(
const SdpVideoFormat::Parameters& params) {
const absl::optional<int> i =
ParsePositiveNumberFromParams(params, kVPxFmtpMaxFrameSize);
return i ? absl::make_optional(i.value() * kVPxFmtpFrameSizeSubBlockPixels)
: absl::nullopt;
}
} // namespace webrtc