Alex Loiko | e5b9416 | 2019-04-08 17:19:41 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "modules/audio_coding/codecs/opus/audio_coder_opus_common.h" |
| 12 | |
| 13 | namespace webrtc { |
| 14 | |
| 15 | absl::optional<std::string> GetFormatParameter(const SdpAudioFormat& format, |
| 16 | const std::string& param) { |
| 17 | auto it = format.parameters.find(param); |
| 18 | if (it == format.parameters.end()) |
| 19 | return absl::nullopt; |
| 20 | |
| 21 | return it->second; |
| 22 | } |
| 23 | |
| 24 | // Parses a comma-separated string "1,2,0,6" into a std::vector<unsigned char>. |
| 25 | template <> |
| 26 | absl::optional<std::vector<unsigned char>> GetFormatParameter( |
| 27 | const SdpAudioFormat& format, |
| 28 | const std::string& param) { |
| 29 | std::vector<unsigned char> result; |
| 30 | const std::string comma_separated_list = |
| 31 | GetFormatParameter(format, param).value_or(""); |
| 32 | size_t pos = 0; |
| 33 | while (pos < comma_separated_list.size()) { |
| 34 | const size_t next_comma = comma_separated_list.find(',', pos); |
| 35 | const size_t distance_to_next_comma = next_comma == std::string::npos |
| 36 | ? std::string::npos |
| 37 | : (next_comma - pos); |
| 38 | auto substring_with_number = |
| 39 | comma_separated_list.substr(pos, distance_to_next_comma); |
| 40 | auto conv = rtc::StringToNumber<int>(substring_with_number); |
| 41 | if (!conv.has_value()) { |
| 42 | return absl::nullopt; |
| 43 | } |
| 44 | result.push_back(*conv); |
| 45 | pos += substring_with_number.size() + 1; |
| 46 | } |
| 47 | return result; |
| 48 | } |
| 49 | |
| 50 | } // namespace webrtc |