1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MEDIA_CAST_CAST_DEFINES_H_
6 #define MEDIA_CAST_CAST_DEFINES_H_
13 #include "base/basictypes.h"
14 #include "base/compiler_specific.h"
15 #include "base/logging.h"
16 #include "base/time/time.h"
17 #include "media/cast/transport/cast_transport_config.h"
22 const int64 kDontShowTimeoutMs = 33;
23 const float kDefaultCongestionControlBackOff = 0.875f;
24 const uint32 kVideoFrequency = 90000;
25 const int64 kSkippedFramesCheckPeriodkMs = 10000;
26 const uint32 kStartFrameId = UINT32_C(0xffffffff);
28 // Number of skipped frames threshold in fps (as configured) per period above.
29 const int kSkippedFramesThreshold = 3;
30 const size_t kMaxIpPacketSize = 1500;
31 const int kStartRttMs = 20;
32 const int64 kCastMessageUpdateIntervalMs = 33;
33 const int64 kNackRepeatIntervalMs = 30;
35 enum CastInitializationStatus {
36 STATUS_AUDIO_UNINITIALIZED,
37 STATUS_VIDEO_UNINITIALIZED,
38 STATUS_AUDIO_INITIALIZED,
39 STATUS_VIDEO_INITIALIZED,
40 STATUS_INVALID_CAST_ENVIRONMENT,
41 STATUS_INVALID_CRYPTO_CONFIGURATION,
42 STATUS_UNSUPPORTED_AUDIO_CODEC,
43 STATUS_UNSUPPORTED_VIDEO_CODEC,
44 STATUS_INVALID_AUDIO_CONFIGURATION,
45 STATUS_INVALID_VIDEO_CONFIGURATION,
46 STATUS_GPU_ACCELERATION_NOT_SUPPORTED,
47 STATUS_GPU_ACCELERATION_ERROR,
50 enum DefaultSettings {
51 kDefaultAudioEncoderBitrate = 0, // This means "auto," and may mean VBR.
52 kDefaultAudioSamplingRate = 48000,
55 kDefaultMaxFrameRate = 30,
56 kDefaultNumberOfVideoBuffers = 1,
57 kDefaultRtcpIntervalMs = 500,
58 kDefaultRtpHistoryMs = 1000,
59 kDefaultRtpMaxDelayMs = 100,
64 kNewPacketCompletingFrame,
69 const uint16 kRtcpCastAllPacketsLost = 0xffff;
71 const size_t kMinLengthOfRtcp = 8;
73 // Basic RTP header + cast header.
74 const size_t kMinLengthOfRtp = 12 + 6;
76 // Each uint16 represents one packet id within a cast frame.
77 typedef std::set<uint16> PacketIdSet;
78 // Each uint8 represents one cast frame.
79 typedef std::map<uint8, PacketIdSet> MissingFramesAndPacketsMap;
81 // TODO(pwestin): Re-factor the functions bellow into a class with static
84 // January 1970, in NTP seconds.
85 // Network Time Protocol (NTP), which is in seconds relative to 0h UTC on
87 static const int64 kUnixEpochInNtpSeconds = INT64_C(2208988800);
89 // Magic fractional unit. Used to convert time (in microseconds) to/from
90 // fractional NTP seconds.
91 static const double kMagicFractionalUnit = 4.294967296E3;
93 // The maximum number of Cast receiver events to keep in history for the
94 // purpose of sending the events through RTCP.
95 // The number chosen should be more than the number of events that can be
96 // stored in a RTCP packet.
97 static const size_t kReceiverRtcpEventHistorySize = 512;
99 inline bool IsNewerFrameId(uint32 frame_id, uint32 prev_frame_id) {
100 return (frame_id != prev_frame_id) &&
101 static_cast<uint32>(frame_id - prev_frame_id) < 0x80000000;
104 inline bool IsNewerRtpTimestamp(uint32 timestamp, uint32 prev_timestamp) {
105 return (timestamp != prev_timestamp) &&
106 static_cast<uint32>(timestamp - prev_timestamp) < 0x80000000;
109 inline bool IsOlderFrameId(uint32 frame_id, uint32 prev_frame_id) {
110 return (frame_id == prev_frame_id) || IsNewerFrameId(prev_frame_id, frame_id);
113 inline bool IsNewerPacketId(uint16 packet_id, uint16 prev_packet_id) {
114 return (packet_id != prev_packet_id) &&
115 static_cast<uint16>(packet_id - prev_packet_id) < 0x8000;
118 inline bool IsNewerSequenceNumber(uint16 sequence_number,
119 uint16 prev_sequence_number) {
120 // Same function as IsNewerPacketId just different data and name.
121 return IsNewerPacketId(sequence_number, prev_sequence_number);
124 // Create a NTP diff from seconds and fractions of seconds; delay_fraction is
125 // fractions of a second where 0x80000000 is half a second.
126 inline uint32 ConvertToNtpDiff(uint32 delay_seconds, uint32 delay_fraction) {
127 return ((delay_seconds & 0x0000FFFF) << 16) +
128 ((delay_fraction & 0xFFFF0000) >> 16);
131 inline base::TimeDelta ConvertFromNtpDiff(uint32 ntp_delay) {
132 uint32 delay_ms = (ntp_delay & 0x0000ffff) * 1000;
134 delay_ms += ((ntp_delay & 0xffff0000) >> 16) * 1000;
135 return base::TimeDelta::FromMilliseconds(delay_ms);
138 inline void ConvertTimeToFractions(int64 time_us,
141 DCHECK_GE(time_us, 0) << "Time must NOT be negative";
142 *seconds = static_cast<uint32>(time_us / base::Time::kMicrosecondsPerSecond);
143 *fractions = static_cast<uint32>(
144 (time_us % base::Time::kMicrosecondsPerSecond) * kMagicFractionalUnit);
147 inline void ConvertTimeTicksToNtp(const base::TimeTicks& time,
149 uint32* ntp_fractions) {
150 base::TimeDelta elapsed_since_unix_epoch =
151 time - base::TimeTicks::UnixEpoch();
154 elapsed_since_unix_epoch.InMicroseconds() +
155 (kUnixEpochInNtpSeconds * base::Time::kMicrosecondsPerSecond);
157 ConvertTimeToFractions(ntp_time_us, ntp_seconds, ntp_fractions);
160 inline base::TimeTicks ConvertNtpToTimeTicks(uint32 ntp_seconds,
161 uint32 ntp_fractions) {
163 static_cast<int64>(ntp_seconds) * base::Time::kMicrosecondsPerSecond +
164 static_cast<int64>(ntp_fractions) / kMagicFractionalUnit;
166 base::TimeDelta elapsed_since_unix_epoch = base::TimeDelta::FromMicroseconds(
168 (kUnixEpochInNtpSeconds * base::Time::kMicrosecondsPerSecond));
169 return base::TimeTicks::UnixEpoch() + elapsed_since_unix_epoch;
172 inline uint32 GetVideoRtpTimestamp(const base::TimeTicks& time_ticks) {
173 base::TimeTicks zero_time;
174 base::TimeDelta recorded_delta = time_ticks - zero_time;
175 // Timestamp is in 90 KHz for video.
176 return static_cast<uint32>(recorded_delta.InMilliseconds() * 90);
179 class RtpSenderStatistics {
181 explicit RtpSenderStatistics(int frequency)
182 : frequency_(frequency),
184 memset(&sender_info_, 0, sizeof(sender_info_));
187 ~RtpSenderStatistics() {}
189 void UpdateInfo(const base::TimeTicks& now) {
190 // Update RTP timestamp and return last stored statistics.
191 uint32 ntp_seconds = 0;
192 uint32 ntp_fraction = 0;
193 uint32 rtp_timestamp = 0;
194 if (rtp_timestamp_ > 0) {
195 base::TimeDelta time_since_last_send = now - time_sent_;
196 rtp_timestamp = rtp_timestamp_ + time_since_last_send.InMilliseconds() *
198 // Update NTP time to current time.
199 ConvertTimeTicksToNtp(now, &ntp_seconds, &ntp_fraction);
201 // Populate sender info.
202 sender_info_.rtp_timestamp = rtp_timestamp;
203 sender_info_.ntp_seconds = ntp_seconds;
204 sender_info_.ntp_fraction = ntp_fraction;
207 transport::RtcpSenderInfo sender_info() const {
211 void Store(transport::RtcpSenderInfo sender_info,
212 base::TimeTicks time_sent,
213 uint32 rtp_timestamp) {
214 sender_info_ = sender_info;
215 time_sent_ = time_sent;
216 rtp_timestamp_ = rtp_timestamp;
221 transport::RtcpSenderInfo sender_info_;
222 base::TimeTicks time_sent_;
223 uint32 rtp_timestamp_;
225 DISALLOW_COPY_AND_ASSIGN(RtpSenderStatistics);
231 #endif // MEDIA_CAST_CAST_DEFINES_H_