|
1 /* |
|
2 * Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of the License "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: Class to provide TS conversion for an RTP-stream based on* |
|
15 */ |
|
16 |
|
17 |
|
18 |
|
19 |
|
20 // INCLUDE FILES |
|
21 #include "CRtpTsConverter.h" |
|
22 #include <ipvideo/CRtpUtil.h> |
|
23 #include "videoserviceutilsLogger.h" |
|
24 |
|
25 // CONSTANTS |
|
26 const TInt KValidRtcpType( 200 ); |
|
27 const TInt KTypeBytesPoint( 1 ); |
|
28 const TInt KNtpSecBytesPoint( 8 ); |
|
29 const TInt KNtpFracBytesPoint( 12 ); |
|
30 const TInt KRtcpTsBytesPoint( 16 ); |
|
31 |
|
32 // ============================ MEMBER FUNCTIONS =============================== |
|
33 |
|
34 // ----------------------------------------------------------------------------- |
|
35 // CRtpTsConverter::NewL |
|
36 // Two-phased constructor. |
|
37 // ----------------------------------------------------------------------------- |
|
38 // |
|
39 EXPORT_C CRtpTsConverter* CRtpTsConverter::NewL( const TUint aClockRate ) |
|
40 { |
|
41 CRtpTsConverter* self = new( ELeave ) CRtpTsConverter( aClockRate ); |
|
42 CleanupStack::PushL( self ); |
|
43 self->ConstructL(); |
|
44 CleanupStack::Pop( self ); |
|
45 return self; |
|
46 } |
|
47 |
|
48 // ----------------------------------------------------------------------------- |
|
49 // CRtpTsConverter::CRtpTsConverter |
|
50 // C++ default constructor can NOT contain any code, that might leave. |
|
51 // ----------------------------------------------------------------------------- |
|
52 // |
|
53 CRtpTsConverter::CRtpTsConverter( const TUint aClockRate ) |
|
54 : iClockRate( aClockRate ), |
|
55 iOffset( 0 ), |
|
56 iInitiated( EFalse ) |
|
57 { |
|
58 // None |
|
59 } |
|
60 |
|
61 // ----------------------------------------------------------------------------- |
|
62 // CRtpTsConverter::ConstructL |
|
63 // Symbian 2nd phase constructor can leave. |
|
64 // ----------------------------------------------------------------------------- |
|
65 // |
|
66 void CRtpTsConverter::ConstructL() |
|
67 { |
|
68 // None |
|
69 } |
|
70 |
|
71 // ----------------------------------------------------------------------------- |
|
72 // CRtpTsConverter::CRtpTsConverter |
|
73 // Destructor. |
|
74 // ----------------------------------------------------------------------------- |
|
75 // |
|
76 EXPORT_C CRtpTsConverter::~CRtpTsConverter() |
|
77 { |
|
78 // None |
|
79 } |
|
80 |
|
81 // ----------------------------------------------------------------------------- |
|
82 // CRtpTsConverter::Init |
|
83 // |
|
84 // ----------------------------------------------------------------------------- |
|
85 // |
|
86 EXPORT_C void CRtpTsConverter::Init( const TDesC8& aRtcpPkt ) |
|
87 { |
|
88 // Verify packet type? |
|
89 if ( aRtcpPkt.Length() > ( KRtcpTsBytesPoint + KIntegerBytes ) && |
|
90 aRtcpPkt[KTypeBytesPoint] == KValidRtcpType && iClockRate > 0 ) |
|
91 { |
|
92 // Handle RTCP packet |
|
93 TUint ntp_sec( 0 ); |
|
94 TUint ntp_frac( 0 ); |
|
95 TUint rtcp_ts( 0 ); |
|
96 TInt err( CRtpUtil::GetValue( |
|
97 aRtcpPkt.Mid( KNtpSecBytesPoint, KIntegerBytes ), ntp_sec ) ); |
|
98 if ( !err ) |
|
99 { |
|
100 LOG1( "CRtpTsConverter::Init(), NTP Timestamp, MSW: %u", ntp_sec ); |
|
101 err = CRtpUtil::GetValue( |
|
102 aRtcpPkt.Mid( KNtpFracBytesPoint, KIntegerBytes ), ntp_frac ); |
|
103 } |
|
104 if ( !err ) |
|
105 { |
|
106 LOG1( "CRtpTsConverter::Init(), NTP Timestamp, LSW: %u", ntp_frac ); |
|
107 err = CRtpUtil::GetValue( |
|
108 aRtcpPkt.Mid( KRtcpTsBytesPoint, KIntegerBytes ), rtcp_ts ); |
|
109 } |
|
110 |
|
111 if ( !err ) |
|
112 { |
|
113 LOG1( "CRtpTsConverter::Init(), RTP Timestamp: %u", rtcp_ts ); |
|
114 // Calculate the wallclock time when this RTCP packet is generated |
|
115 TUint wallClock( ( ntp_sec & 0x00FF ) * 1000 ); |
|
116 wallClock += ( ( ( ntp_frac >> 16 ) & 0x0000FFFF ) * 1000 ) >> 16; |
|
117 |
|
118 // Compute the proper time offset |
|
119 iOffset = ComputeOffset( rtcp_ts, wallClock, iClockRate ); |
|
120 } |
|
121 } |
|
122 } |
|
123 // ----------------------------------------------------------------------------- |
|
124 // CRtpTsConverter::Init |
|
125 // Compute the proper time offset. No wallclok time available. |
|
126 // ----------------------------------------------------------------------------- |
|
127 // |
|
128 EXPORT_C void CRtpTsConverter::Init( const TUint& aTs ) |
|
129 { |
|
130 iOffset = ComputeOffset( aTs, 0, iClockRate ); |
|
131 } |
|
132 |
|
133 // ----------------------------------------------------------------------------- |
|
134 // CRtpTsConverter::Initiated |
|
135 // Returns: initiated status of converter. |
|
136 // ----------------------------------------------------------------------------- |
|
137 // |
|
138 EXPORT_C TBool CRtpTsConverter::Initiated() |
|
139 { |
|
140 return iInitiated; |
|
141 } |
|
142 |
|
143 // ----------------------------------------------------------------------------- |
|
144 // CRtpTsConverter::UnInitiate |
|
145 // |
|
146 // ----------------------------------------------------------------------------- |
|
147 // |
|
148 EXPORT_C void CRtpTsConverter::UnInitiate() |
|
149 { |
|
150 iInitiated = EFalse; |
|
151 } |
|
152 |
|
153 // ----------------------------------------------------------------------------- |
|
154 // CRtpTsConverter::ConvertTs |
|
155 // Returns: converted unsigned integer value of timestamp. |
|
156 // ----------------------------------------------------------------------------- |
|
157 // |
|
158 EXPORT_C TUint CRtpTsConverter::ConvertTs( |
|
159 const TUint aTimestamp, |
|
160 TBool aUseWallClock ) |
|
161 { |
|
162 TUint ret( KMaxTUint ); |
|
163 |
|
164 if ( iClockRate == KPipelineClockRate ) |
|
165 { |
|
166 ret = aTimestamp - iOffset; |
|
167 } |
|
168 else |
|
169 { |
|
170 if ( iClockRate > 0 ) |
|
171 { |
|
172 ret = aTimestamp - iOffset; |
|
173 |
|
174 if ( aUseWallClock ) |
|
175 { |
|
176 TUint sec( ret / iClockRate ); |
|
177 TUint subSec( ret % iClockRate ); |
|
178 ret = ( ( sec * KPipelineClockRate ) + |
|
179 ( subSec * KPipelineClockRate ) / iClockRate ); |
|
180 } |
|
181 } |
|
182 } |
|
183 |
|
184 return ret; |
|
185 } |
|
186 |
|
187 // ----------------------------------------------------------------------------- |
|
188 // CRtpTsConverter::ComputeOffset |
|
189 // Returns: offset of the RTP timestamp. |
|
190 // ----------------------------------------------------------------------------- |
|
191 // |
|
192 TUint CRtpTsConverter::ComputeOffset( |
|
193 TUint aRtpTime, |
|
194 TUint aSeekTime, |
|
195 TInt aClockRate ) |
|
196 { |
|
197 TUint ret( KMaxTUint ); |
|
198 |
|
199 if ( aClockRate ) |
|
200 { |
|
201 TUint rtpSec( aRtpTime / aClockRate ); |
|
202 TUint rtpFracSecTU( aRtpTime % aClockRate ); // transport units |
|
203 TUint seekSec( aSeekTime / 1000 ); |
|
204 TUint seekFracSecTU( ( ( aSeekTime % 1000) * aClockRate ) / 1000 ); |
|
205 |
|
206 TUint offsetSec( rtpSec - seekSec ); |
|
207 TUint offsetFracSecTU( rtpFracSecTU - seekFracSecTU ); |
|
208 |
|
209 if ( rtpFracSecTU < seekFracSecTU ) |
|
210 { |
|
211 offsetSec--; |
|
212 offsetFracSecTU = aClockRate + rtpFracSecTU - seekFracSecTU; |
|
213 } |
|
214 |
|
215 ret = ( offsetSec * aClockRate ) + offsetFracSecTU; |
|
216 iInitiated = ETrue; |
|
217 } |
|
218 |
|
219 return ret; |
|
220 } |
|
221 |
|
222 // End of File |