1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "ARTPAssembler.h"
18
19 #include <media/stagefright/foundation/ABuffer.h>
20 #include <media/stagefright/foundation/ADebug.h>
21 #include <media/stagefright/foundation/ALooper.h>
22 #include <media/stagefright/foundation/AMessage.h>
23
24 #include <stdint.h>
25
26 namespace android {
27
ARTPAssembler()28 ARTPAssembler::ARTPAssembler()
29 : mFirstFailureTimeUs(-1) {
30 }
31
onPacketReceived(const sp<ARTPSource> & source)32 void ARTPAssembler::onPacketReceived(const sp<ARTPSource> &source) {
33 AssemblyStatus status;
34 for (;;) {
35 status = assembleMore(source);
36
37 if (status == WRONG_SEQUENCE_NUMBER) {
38 if (mFirstFailureTimeUs >= 0) {
39 if (ALooper::GetNowUs() - mFirstFailureTimeUs > 10000LL) {
40 mFirstFailureTimeUs = -1;
41
42 // LOG(VERBOSE) << "waited too long for packet.";
43 packetLost();
44 continue;
45 }
46 } else {
47 mFirstFailureTimeUs = ALooper::GetNowUs();
48 }
49 break;
50 } else {
51 mFirstFailureTimeUs = -1;
52
53 if (status == NOT_ENOUGH_DATA) {
54 break;
55 }
56 }
57 }
58 }
59
60 // static
CopyTimes(const sp<ABuffer> & to,const sp<ABuffer> & from)61 void ARTPAssembler::CopyTimes(const sp<ABuffer> &to, const sp<ABuffer> &from) {
62 uint32_t rtpTime;
63 CHECK(from->meta()->findInt32("rtp-time", (int32_t *)&rtpTime));
64
65 to->meta()->setInt32("rtp-time", rtpTime);
66
67 // Copy the seq number.
68 to->setInt32Data(from->int32Data());
69 }
70
71 // static
MakeADTSCompoundFromAACFrames(unsigned profile,unsigned samplingFreqIndex,unsigned channelConfig,const List<sp<ABuffer>> & frames)72 sp<ABuffer> ARTPAssembler::MakeADTSCompoundFromAACFrames(
73 unsigned profile,
74 unsigned samplingFreqIndex,
75 unsigned channelConfig,
76 const List<sp<ABuffer> > &frames) {
77 size_t totalSize = 0;
78 for (List<sp<ABuffer> >::const_iterator it = frames.begin();
79 it != frames.end(); ++it) {
80 // Each frame is prefixed by a 7 byte ADTS header
81 totalSize += (*it)->size() + 7;
82 }
83
84 sp<ABuffer> accessUnit = new ABuffer(totalSize);
85 size_t offset = 0;
86 for (List<sp<ABuffer> >::const_iterator it = frames.begin();
87 it != frames.end(); ++it) {
88 sp<ABuffer> nal = *it;
89 uint8_t *dst = accessUnit->data() + offset;
90
91 static const unsigned kADTSId = 0;
92 static const unsigned kADTSLayer = 0;
93 static const unsigned kADTSProtectionAbsent = 1;
94
95 unsigned frameLength = nal->size() + 7;
96
97 dst[0] = 0xff;
98
99 dst[1] =
100 0xf0 | (kADTSId << 3) | (kADTSLayer << 1) | kADTSProtectionAbsent;
101
102 dst[2] = (profile << 6)
103 | (samplingFreqIndex << 2)
104 | (channelConfig >> 2);
105
106 dst[3] = ((channelConfig & 3) << 6) | (frameLength >> 11);
107
108 dst[4] = (frameLength >> 3) & 0xff;
109 dst[5] = (frameLength & 7) << 5;
110 dst[6] = 0x00;
111
112 memcpy(dst + 7, nal->data(), nal->size());
113 offset += nal->size() + 7;
114 }
115
116 CopyTimes(accessUnit, *frames.begin());
117
118 return accessUnit;
119 }
120
121 // static
MakeCompoundFromPackets(const List<sp<ABuffer>> & packets)122 sp<ABuffer> ARTPAssembler::MakeCompoundFromPackets(
123 const List<sp<ABuffer> > &packets) {
124 size_t totalSize = 0;
125 for (List<sp<ABuffer> >::const_iterator it = packets.begin();
126 it != packets.end(); ++it) {
127 totalSize += (*it)->size();
128 }
129
130 sp<ABuffer> accessUnit = new ABuffer(totalSize);
131 size_t offset = 0;
132 for (List<sp<ABuffer> >::const_iterator it = packets.begin();
133 it != packets.end(); ++it) {
134 sp<ABuffer> nal = *it;
135 memcpy(accessUnit->data() + offset, nal->data(), nal->size());
136 offset += nal->size();
137 }
138
139 CopyTimes(accessUnit, *packets.begin());
140
141 return accessUnit;
142 }
143
144 } // namespace android
145