56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
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/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "media/base/sdp_fmtp_utils.h"
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#include <map>
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#include <utility>
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#include "rtc_base/string_to_number.h"
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namespace webrtc {
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namespace {
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// Max frame rate for VP8 and VP9 video.
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const char kVPxFmtpMaxFrameRate[] = "max-fr";
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// Max frame size for VP8 and VP9 video.
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const char kVPxFmtpMaxFrameSize[] = "max-fs";
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const int kVPxFmtpFrameSizeSubBlockPixels = 256;
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absl::optional<int> ParsePositiveNumberFromParams(
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const SdpVideoFormat::Parameters& params,
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const char* parameter_name) {
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const auto max_frame_rate_it = params.find(parameter_name);
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if (max_frame_rate_it == params.end())
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return absl::nullopt;
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const absl::optional<int> i =
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rtc::StringToNumber<int>(max_frame_rate_it->second);
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if (!i.has_value() || i.value() <= 0)
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return absl::nullopt;
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return i;
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}
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} // namespace
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absl::optional<int> ParseSdpForVPxMaxFrameRate(
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const SdpVideoFormat::Parameters& params) {
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return ParsePositiveNumberFromParams(params, kVPxFmtpMaxFrameRate);
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}
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absl::optional<int> ParseSdpForVPxMaxFrameSize(
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const SdpVideoFormat::Parameters& params) {
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const absl::optional<int> i =
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ParsePositiveNumberFromParams(params, kVPxFmtpMaxFrameSize);
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return i ? absl::make_optional(i.value() * kVPxFmtpFrameSizeSubBlockPixels)
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: absl::nullopt;
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}
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} // namespace webrtc
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