1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* Copyright (c) 2020 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 "audio/channel_receive_frame_transformer_delegate.h"
#include <utility>
#include "rtc_base/buffer.h"
namespace webrtc {
namespace {
class TransformableIncomingAudioFrame
: public TransformableAudioFrameInterface {
public:
TransformableIncomingAudioFrame(rtc::ArrayView<const uint8_t> payload,
const RTPHeader& header,
uint32_t ssrc)
: payload_(payload.data(), payload.size()),
header_(header),
ssrc_(ssrc) {}
~TransformableIncomingAudioFrame() override = default;
rtc::ArrayView<const uint8_t> GetData() const override { return payload_; }
void SetData(rtc::ArrayView<const uint8_t> data) override {
payload_.SetData(data.data(), data.size());
}
void SetRTPTimestamp(uint32_t timestamp) override {
header_.timestamp = timestamp;
}
uint8_t GetPayloadType() const override { return header_.payloadType; }
uint32_t GetSsrc() const override { return ssrc_; }
uint32_t GetTimestamp() const override { return header_.timestamp; }
rtc::ArrayView<const uint32_t> GetContributingSources() const override {
return rtc::ArrayView<const uint32_t>(header_.arrOfCSRCs, header_.numCSRCs);
}
Direction GetDirection() const override { return Direction::kReceiver; }
const absl::optional<uint16_t> SequenceNumber() const override {
return header_.sequenceNumber;
}
absl::optional<uint64_t> AbsoluteCaptureTimestamp() const override {
// This could be extracted from received header extensions + extrapolation,
// if required in future, eg for being able to re-send received frames.
return absl::nullopt;
}
const RTPHeader& Header() const { return header_; }
FrameType Type() const override {
return header_.extension.voiceActivity ? FrameType::kAudioFrameSpeech
: FrameType::kAudioFrameCN;
}
private:
rtc::Buffer payload_;
RTPHeader header_;
uint32_t ssrc_;
};
} // namespace
ChannelReceiveFrameTransformerDelegate::ChannelReceiveFrameTransformerDelegate(
ReceiveFrameCallback receive_frame_callback,
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
TaskQueueBase* channel_receive_thread)
: receive_frame_callback_(receive_frame_callback),
frame_transformer_(std::move(frame_transformer)),
channel_receive_thread_(channel_receive_thread) {}
void ChannelReceiveFrameTransformerDelegate::Init() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
frame_transformer_->RegisterTransformedFrameCallback(
rtc::scoped_refptr<TransformedFrameCallback>(this));
}
void ChannelReceiveFrameTransformerDelegate::Reset() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
frame_transformer_->UnregisterTransformedFrameCallback();
frame_transformer_ = nullptr;
receive_frame_callback_ = ReceiveFrameCallback();
}
void ChannelReceiveFrameTransformerDelegate::Transform(
rtc::ArrayView<const uint8_t> packet,
const RTPHeader& header,
uint32_t ssrc) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
frame_transformer_->Transform(
std::make_unique<TransformableIncomingAudioFrame>(packet, header, ssrc));
}
void ChannelReceiveFrameTransformerDelegate::OnTransformedFrame(
std::unique_ptr<TransformableFrameInterface> frame) {
rtc::scoped_refptr<ChannelReceiveFrameTransformerDelegate> delegate(this);
channel_receive_thread_->PostTask(
[delegate = std::move(delegate), frame = std::move(frame)]() mutable {
delegate->ReceiveFrame(std::move(frame));
});
}
void ChannelReceiveFrameTransformerDelegate::ReceiveFrame(
std::unique_ptr<TransformableFrameInterface> frame) const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (!receive_frame_callback_)
return;
RTPHeader header;
if (frame->GetDirection() ==
TransformableFrameInterface::Direction::kSender) {
auto* transformed_frame =
static_cast<TransformableAudioFrameInterface*>(frame.get());
header.payloadType = transformed_frame->GetPayloadType();
header.timestamp = transformed_frame->GetTimestamp();
header.ssrc = transformed_frame->GetSsrc();
if (transformed_frame->AbsoluteCaptureTimestamp().has_value()) {
header.extension.absolute_capture_time = AbsoluteCaptureTime();
header.extension.absolute_capture_time->absolute_capture_timestamp =
transformed_frame->AbsoluteCaptureTimestamp().value();
}
} else {
auto* transformed_frame =
static_cast<TransformableIncomingAudioFrame*>(frame.get());
header = transformed_frame->Header();
}
// TODO(crbug.com/1464860): Take an explicit struct with the required
// information rather than the RTPHeader to make it easier to
// construct the required information when injecting transformed frames not
// originally from this receiver.
receive_frame_callback_(frame->GetData(), header);
}
} // namespace webrtc
|
