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 #ifndef MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_CODER_OPUS_COMMON_H_
12 #define MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_CODER_OPUS_COMMON_H_
13
14 #include <string>
15 #include <utility>
16 #include <vector>
17
18 #include "absl/strings/string_view.h"
19 #include "absl/types/optional.h"
20 #include "api/audio_codecs/audio_decoder.h"
21 #include "api/audio_codecs/audio_format.h"
22 #include "rtc_base/string_to_number.h"
23
24 namespace webrtc {
25
26 absl::optional<std::string> GetFormatParameter(const SdpAudioFormat& format,
27 absl::string_view param);
28
29 template <typename T>
GetFormatParameter(const SdpAudioFormat & format,absl::string_view param)30 absl::optional<T> GetFormatParameter(const SdpAudioFormat& format,
31 absl::string_view param) {
32 return rtc::StringToNumber<T>(GetFormatParameter(format, param).value_or(""));
33 }
34
35 template <>
36 absl::optional<std::vector<unsigned char>> GetFormatParameter(
37 const SdpAudioFormat& format,
38 absl::string_view param);
39
40 class OpusFrame : public AudioDecoder::EncodedAudioFrame {
41 public:
OpusFrame(AudioDecoder * decoder,rtc::Buffer && payload,bool is_primary_payload)42 OpusFrame(AudioDecoder* decoder,
43 rtc::Buffer&& payload,
44 bool is_primary_payload)
45 : decoder_(decoder),
46 payload_(std::move(payload)),
47 is_primary_payload_(is_primary_payload) {}
48
Duration()49 size_t Duration() const override {
50 int ret;
51 if (is_primary_payload_) {
52 ret = decoder_->PacketDuration(payload_.data(), payload_.size());
53 } else {
54 ret = decoder_->PacketDurationRedundant(payload_.data(), payload_.size());
55 }
56 return (ret < 0) ? 0 : static_cast<size_t>(ret);
57 }
58
IsDtxPacket()59 bool IsDtxPacket() const override { return payload_.size() <= 2; }
60
Decode(rtc::ArrayView<int16_t> decoded)61 absl::optional<DecodeResult> Decode(
62 rtc::ArrayView<int16_t> decoded) const override {
63 AudioDecoder::SpeechType speech_type = AudioDecoder::kSpeech;
64 int ret;
65 if (is_primary_payload_) {
66 ret = decoder_->Decode(
67 payload_.data(), payload_.size(), decoder_->SampleRateHz(),
68 decoded.size() * sizeof(int16_t), decoded.data(), &speech_type);
69 } else {
70 ret = decoder_->DecodeRedundant(
71 payload_.data(), payload_.size(), decoder_->SampleRateHz(),
72 decoded.size() * sizeof(int16_t), decoded.data(), &speech_type);
73 }
74
75 if (ret < 0)
76 return absl::nullopt;
77
78 return DecodeResult{static_cast<size_t>(ret), speech_type};
79 }
80
81 private:
82 AudioDecoder* const decoder_;
83 const rtc::Buffer payload_;
84 const bool is_primary_payload_;
85 };
86
87 } // namespace webrtc
88
89 #endif // MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_CODER_OPUS_COMMON_H_
90