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e5b94160b5
See https://webrtc-review.googlesource.com/c/src/+/121764 for the overall vision. This CL adds a multistream Opus decoder. It's a new code-path to not interfere with the standard Opus decoder. We introduce new SDP syntax, which uses terminology of RFC 7845. We also set up the decoder side to parse it. The encoder part will come in a later CL. E.g. this is the new SDP syntax for 6.1 surround sound: "multiopus/48000/6 channel_mapping=0,4,1,2,3,5 num_streams=4 coupled_streams=2" Bug: webrtc:8649 Change-Id: Ifbc584cbb6d07aed373f223512a20d6d72cec5ec Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/129768 Commit-Queue: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Oskar Sundbom <ossu@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27493}
50 lines
1.8 KiB
C++
50 lines
1.8 KiB
C++
/*
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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 "modules/audio_coding/codecs/opus/audio_coder_opus_common.h"
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namespace webrtc {
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absl::optional<std::string> GetFormatParameter(const SdpAudioFormat& format,
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const std::string& param) {
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auto it = format.parameters.find(param);
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if (it == format.parameters.end())
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return absl::nullopt;
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return it->second;
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}
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// Parses a comma-separated string "1,2,0,6" into a std::vector<unsigned char>.
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template <>
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absl::optional<std::vector<unsigned char>> GetFormatParameter(
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const SdpAudioFormat& format,
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const std::string& param) {
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std::vector<unsigned char> result;
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const std::string comma_separated_list =
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GetFormatParameter(format, param).value_or("");
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size_t pos = 0;
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while (pos < comma_separated_list.size()) {
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const size_t next_comma = comma_separated_list.find(',', pos);
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const size_t distance_to_next_comma = next_comma == std::string::npos
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? std::string::npos
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: (next_comma - pos);
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auto substring_with_number =
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comma_separated_list.substr(pos, distance_to_next_comma);
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auto conv = rtc::StringToNumber<int>(substring_with_number);
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if (!conv.has_value()) {
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return absl::nullopt;
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}
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result.push_back(*conv);
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pos += substring_with_number.size() + 1;
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}
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return result;
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}
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} // namespace webrtc
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