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/*
* 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 "modules/audio_coding/codecs/opus/audio_coder_opus_common.h"
#include "absl/strings/string_view.h"
namespace webrtc {
absl::optional<std::string> GetFormatParameter(const SdpAudioFormat& format,
absl::string_view param) {
auto it = format.parameters.find(std::string(param));
if (it == format.parameters.end())
return absl::nullopt;
return it->second;
}
// Parses a comma-separated string "1,2,0,6" into a std::vector<unsigned char>.
template <>
absl::optional<std::vector<unsigned char>> GetFormatParameter(
const SdpAudioFormat& format,
absl::string_view param) {
std::vector<unsigned char> result;
const std::string comma_separated_list =
GetFormatParameter(format, param).value_or("");
size_t pos = 0;
while (pos < comma_separated_list.size()) {
const size_t next_comma = comma_separated_list.find(',', pos);
const size_t distance_to_next_comma = next_comma == std::string::npos
? std::string::npos
: (next_comma - pos);
auto substring_with_number =
comma_separated_list.substr(pos, distance_to_next_comma);
auto conv = rtc::StringToNumber<int>(substring_with_number);
if (!conv.has_value()) {
return absl::nullopt;
}
result.push_back(*conv);
pos += substring_with_number.size() + 1;
}
return result;
}
} // namespace webrtc