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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/cast/cast_sender_impl.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
namespace media {
namespace cast {
// static
void FrameInput::DeleteAudioFrame(const PcmAudioFrame* frame) {
delete frame;
}
// static
void FrameInput::DeleteVideoFrame(const I420VideoFrame* video_frame) {
delete [] video_frame->y_plane.data;
delete [] video_frame->u_plane.data;
delete [] video_frame->v_plane.data;
delete video_frame;
}
// The LocalFrameInput class posts all incoming frames; audio and video to the
// main cast thread for processing.
// This make the cast sender interface thread safe.
class LocalFrameInput : public FrameInput {
public:
LocalFrameInput(scoped_refptr<CastEnvironment> cast_environment,
base::WeakPtr<AudioSender> audio_sender,
base::WeakPtr<VideoSender> video_sender)
: cast_environment_(cast_environment),
audio_sender_(audio_sender),
video_sender_(video_sender) {}
virtual void InsertRawVideoFrame(const I420VideoFrame* video_frame,
const base::TimeTicks& capture_time,
const base::Closure callback) OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&VideoSender::InsertRawVideoFrame, video_sender_,
video_frame, capture_time, callback));
}
virtual void InsertCodedVideoFrame(const EncodedVideoFrame* video_frame,
const base::TimeTicks& capture_time,
const base::Closure callback) OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&VideoSender::InsertCodedVideoFrame, video_sender_,
video_frame, capture_time, callback));
}
virtual void InsertRawAudioFrame(const PcmAudioFrame* audio_frame,
const base::TimeTicks& recorded_time,
const base::Closure callback) OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&AudioSender::InsertRawAudioFrame, audio_sender_,
audio_frame, recorded_time, callback));
}
virtual void InsertCodedAudioFrame(const EncodedAudioFrame* audio_frame,
const base::TimeTicks& recorded_time,
const base::Closure callback) OVERRIDE {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&AudioSender::InsertCodedAudioFrame, audio_sender_,
audio_frame, recorded_time, callback));
}
protected:
virtual ~LocalFrameInput() {}
private:
friend class base::RefCountedThreadSafe<LocalFrameInput>;
scoped_refptr<CastEnvironment> cast_environment_;
base::WeakPtr<AudioSender> audio_sender_;
base::WeakPtr<VideoSender> video_sender_;
};
// LocalCastSenderPacketReceiver handle the incoming packets to the cast sender
// it's only expected to receive RTCP feedback packets from the remote cast
// receiver. The class verifies that that it is a RTCP packet and based on the
// SSRC of the incoming packet route the packet to the correct sender; audio or
// video.
//
// Definition of SSRC as defined in RFC 3550.
// Synchronization source (SSRC): The source of a stream of RTP
// packets, identified by a 32-bit numeric SSRC identifier carried in
// the RTP header so as not to be dependent upon the network address.
// All packets from a synchronization source form part of the same
// timing and sequence number space, so a receiver groups packets by
// synchronization source for playback. Examples of synchronization
// sources include the sender of a stream of packets derived from a
// signal source such as a microphone or a camera, or an RTP mixer
// (see below). A synchronization source may change its data format,
// e.g., audio encoding, over time. The SSRC identifier is a
// randomly chosen value meant to be globally unique within a
// particular RTP session (see Section 8). A participant need not
// use the same SSRC identifier for all the RTP sessions in a
// multimedia session; the binding of the SSRC identifiers is
// provided through RTCP (see Section 6.5.1). If a participant
// generates multiple streams in one RTP session, for example from
// separate video cameras, each MUST be identified as a different
// SSRC.
class LocalCastSenderPacketReceiver : public PacketReceiver {
public:
LocalCastSenderPacketReceiver(scoped_refptr<CastEnvironment> cast_environment,
base::WeakPtr<AudioSender> audio_sender,
base::WeakPtr<VideoSender> video_sender,
uint32 ssrc_of_audio_sender,
uint32 ssrc_of_video_sender)
: cast_environment_(cast_environment),
audio_sender_(audio_sender),
video_sender_(video_sender),
ssrc_of_audio_sender_(ssrc_of_audio_sender),
ssrc_of_video_sender_(ssrc_of_video_sender) {}
virtual void ReceivedPacket(const uint8* packet,
size_t length,
const base::Closure callback) OVERRIDE {
if (!Rtcp::IsRtcpPacket(packet, length)) {
// We should have no incoming RTP packets.
// No action; just log and call the callback informing that we are done
// with the packet.
VLOG(1) << "Unexpectedly received a RTP packet in the cast sender";
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE, callback);
return;
}
uint32 ssrc_of_sender = Rtcp::GetSsrcOfSender(packet, length);
if (ssrc_of_sender == ssrc_of_audio_sender_) {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&AudioSender::IncomingRtcpPacket, audio_sender_,
packet, length, callback));
} else if (ssrc_of_sender == ssrc_of_video_sender_) {
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE,
base::Bind(&VideoSender::IncomingRtcpPacket, video_sender_,
packet, length, callback));
} else {
// No action; just log and call the callback informing that we are done
// with the packet.
VLOG(1) << "Received a RTCP packet with a non matching sender SSRC "
<< ssrc_of_sender;
cast_environment_->PostTask(CastEnvironment::MAIN, FROM_HERE, callback);
}
}
protected:
virtual ~LocalCastSenderPacketReceiver() {}
private:
friend class base::RefCountedThreadSafe<LocalCastSenderPacketReceiver>;
scoped_refptr<CastEnvironment> cast_environment_;
base::WeakPtr<AudioSender> audio_sender_;
base::WeakPtr<VideoSender> video_sender_;
const uint32 ssrc_of_audio_sender_;
const uint32 ssrc_of_video_sender_;
};
CastSender* CastSender::CreateCastSender(
scoped_refptr<CastEnvironment> cast_environment,
const AudioSenderConfig& audio_config,
const VideoSenderConfig& video_config,
VideoEncoderController* const video_encoder_controller,
PacketSender* const packet_sender) {
return new CastSenderImpl(cast_environment,
audio_config,
video_config,
video_encoder_controller,
packet_sender);
}
CastSenderImpl::CastSenderImpl(
scoped_refptr<CastEnvironment> cast_environment,
const AudioSenderConfig& audio_config,
const VideoSenderConfig& video_config,
VideoEncoderController* const video_encoder_controller,
PacketSender* const packet_sender)
: pacer_(cast_environment, packet_sender),
audio_sender_(cast_environment, audio_config, &pacer_),
video_sender_(cast_environment, video_config, video_encoder_controller,
&pacer_),
frame_input_(new LocalFrameInput(cast_environment,
audio_sender_.AsWeakPtr(),
video_sender_.AsWeakPtr())),
packet_receiver_(new LocalCastSenderPacketReceiver(cast_environment,
audio_sender_.AsWeakPtr(), video_sender_.AsWeakPtr(),
audio_config.incoming_feedback_ssrc,
video_config.incoming_feedback_ssrc)) {}
CastSenderImpl::~CastSenderImpl() {}
scoped_refptr<FrameInput> CastSenderImpl::frame_input() {
return frame_input_;
}
scoped_refptr<PacketReceiver> CastSenderImpl::packet_receiver() {
return packet_receiver_;
}
} // namespace cast
} // namespace media
|
