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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // The serialization format is as follows: | 5 // The serialization format is as follows: |
6 // 16-bit integer describing the following LogMetadata proto size in bytes. | 6 // 16-bit integer describing the following LogMetadata proto size in bytes. |
7 // The LogMetadata proto. | 7 // The LogMetadata proto. |
8 // 32-bit integer describing number of frame events. | 8 // 32-bit integer describing number of frame events. |
9 // (The following repeated for number of frame events): | 9 // (The following repeated for number of frame events): |
10 // 16-bit integer describing the following AggregatedFrameEvent proto size | 10 // 16-bit integer describing the following AggregatedFrameEvent proto size |
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40 bool DoSerializeEvents(const LogMetadata& metadata, | 40 bool DoSerializeEvents(const LogMetadata& metadata, |
41 const FrameEventList& frame_events, | 41 const FrameEventList& frame_events, |
42 const PacketEventList& packet_events, | 42 const PacketEventList& packet_events, |
43 const int max_output_bytes, | 43 const int max_output_bytes, |
44 char* output, | 44 char* output, |
45 int* output_bytes) { | 45 int* output_bytes) { |
46 base::BigEndianWriter writer(output, max_output_bytes); | 46 base::BigEndianWriter writer(output, max_output_bytes); |
47 | 47 |
48 int proto_size = metadata.ByteSize(); | 48 int proto_size = metadata.ByteSize(); |
49 DCHECK(proto_size <= kMaxSerializedProtoBytes); | 49 DCHECK(proto_size <= kMaxSerializedProtoBytes); |
50 if (!writer.WriteU16(static_cast<uint16>(proto_size))) | 50 if (!writer.WriteU16(static_cast<uint16_t>(proto_size))) |
51 return false; | 51 return false; |
52 if (!metadata.SerializeToArray(writer.ptr(), writer.remaining())) | 52 if (!metadata.SerializeToArray(writer.ptr(), writer.remaining())) |
53 return false; | 53 return false; |
54 if (!writer.Skip(proto_size)) | 54 if (!writer.Skip(proto_size)) |
55 return false; | 55 return false; |
56 | 56 |
57 RtpTimestamp prev_rtp_timestamp = 0; | 57 RtpTimestamp prev_rtp_timestamp = 0; |
58 for (media::cast::FrameEventList::const_iterator it = frame_events.begin(); | 58 for (media::cast::FrameEventList::const_iterator it = frame_events.begin(); |
59 it != frame_events.end(); | 59 it != frame_events.end(); |
60 ++it) { | 60 ++it) { |
61 media::cast::proto::AggregatedFrameEvent frame_event(**it); | 61 media::cast::proto::AggregatedFrameEvent frame_event(**it); |
62 | 62 |
63 // Adjust relative RTP timestamp so that it is relative to previous frame, | 63 // Adjust relative RTP timestamp so that it is relative to previous frame, |
64 // rather than relative to first RTP timestamp. | 64 // rather than relative to first RTP timestamp. |
65 // This is done to improve encoding size. | 65 // This is done to improve encoding size. |
66 RtpTimestamp old_relative_rtp_timestamp = | 66 RtpTimestamp old_relative_rtp_timestamp = |
67 frame_event.relative_rtp_timestamp(); | 67 frame_event.relative_rtp_timestamp(); |
68 frame_event.set_relative_rtp_timestamp( | 68 frame_event.set_relative_rtp_timestamp( |
69 old_relative_rtp_timestamp - prev_rtp_timestamp); | 69 old_relative_rtp_timestamp - prev_rtp_timestamp); |
70 prev_rtp_timestamp = old_relative_rtp_timestamp; | 70 prev_rtp_timestamp = old_relative_rtp_timestamp; |
71 | 71 |
72 proto_size = frame_event.ByteSize(); | 72 proto_size = frame_event.ByteSize(); |
73 DCHECK(proto_size <= kMaxSerializedProtoBytes); | 73 DCHECK(proto_size <= kMaxSerializedProtoBytes); |
74 | 74 |
75 // Write size of the proto, then write the proto. | 75 // Write size of the proto, then write the proto. |
76 if (!writer.WriteU16(static_cast<uint16>(proto_size))) | 76 if (!writer.WriteU16(static_cast<uint16_t>(proto_size))) |
77 return false; | 77 return false; |
78 if (!frame_event.SerializeToArray(writer.ptr(), writer.remaining())) | 78 if (!frame_event.SerializeToArray(writer.ptr(), writer.remaining())) |
79 return false; | 79 return false; |
80 if (!writer.Skip(proto_size)) | 80 if (!writer.Skip(proto_size)) |
81 return false; | 81 return false; |
82 } | 82 } |
83 | 83 |
84 // Write packet events. | 84 // Write packet events. |
85 prev_rtp_timestamp = 0; | 85 prev_rtp_timestamp = 0; |
86 for (media::cast::PacketEventList::const_iterator it = packet_events.begin(); | 86 for (media::cast::PacketEventList::const_iterator it = packet_events.begin(); |
87 it != packet_events.end(); | 87 it != packet_events.end(); |
88 ++it) { | 88 ++it) { |
89 media::cast::proto::AggregatedPacketEvent packet_event(**it); | 89 media::cast::proto::AggregatedPacketEvent packet_event(**it); |
90 RtpTimestamp old_relative_rtp_timestamp = | 90 RtpTimestamp old_relative_rtp_timestamp = |
91 packet_event.relative_rtp_timestamp(); | 91 packet_event.relative_rtp_timestamp(); |
92 packet_event.set_relative_rtp_timestamp( | 92 packet_event.set_relative_rtp_timestamp( |
93 old_relative_rtp_timestamp - prev_rtp_timestamp); | 93 old_relative_rtp_timestamp - prev_rtp_timestamp); |
94 prev_rtp_timestamp = old_relative_rtp_timestamp; | 94 prev_rtp_timestamp = old_relative_rtp_timestamp; |
95 | 95 |
96 proto_size = packet_event.ByteSize(); | 96 proto_size = packet_event.ByteSize(); |
97 DCHECK(proto_size <= kMaxSerializedProtoBytes); | 97 DCHECK(proto_size <= kMaxSerializedProtoBytes); |
98 | 98 |
99 // Write size of the proto, then write the proto. | 99 // Write size of the proto, then write the proto. |
100 if (!writer.WriteU16(static_cast<uint16>(proto_size))) | 100 if (!writer.WriteU16(static_cast<uint16_t>(proto_size))) |
101 return false; | 101 return false; |
102 if (!packet_event.SerializeToArray(writer.ptr(), writer.remaining())) | 102 if (!packet_event.SerializeToArray(writer.ptr(), writer.remaining())) |
103 return false; | 103 return false; |
104 if (!writer.Skip(proto_size)) | 104 if (!writer.Skip(proto_size)) |
105 return false; | 105 return false; |
106 } | 106 } |
107 | 107 |
108 *output_bytes = max_output_bytes - writer.remaining(); | 108 *output_bytes = max_output_bytes - writer.remaining(); |
109 return true; | 109 return true; |
110 } | 110 } |
111 | 111 |
112 bool Compress(char* uncompressed_buffer, | 112 bool Compress(char* uncompressed_buffer, |
113 int uncompressed_bytes, | 113 int uncompressed_bytes, |
114 int max_output_bytes, | 114 int max_output_bytes, |
115 char* output, | 115 char* output, |
116 int* output_bytes) { | 116 int* output_bytes) { |
117 z_stream stream = {0}; | 117 z_stream stream = {0}; |
118 int result = deflateInit2(&stream, | 118 int result = deflateInit2(&stream, |
119 Z_DEFAULT_COMPRESSION, | 119 Z_DEFAULT_COMPRESSION, |
120 Z_DEFLATED, | 120 Z_DEFLATED, |
121 // 16 is added to produce a gzip header + trailer. | 121 // 16 is added to produce a gzip header + trailer. |
122 MAX_WBITS + 16, | 122 MAX_WBITS + 16, |
123 8, // memLevel = 8 is default. | 123 8, // memLevel = 8 is default. |
124 Z_DEFAULT_STRATEGY); | 124 Z_DEFAULT_STRATEGY); |
125 DCHECK_EQ(Z_OK, result); | 125 DCHECK_EQ(Z_OK, result); |
126 | 126 |
127 stream.next_in = reinterpret_cast<uint8*>(uncompressed_buffer); | 127 stream.next_in = reinterpret_cast<uint8_t*>(uncompressed_buffer); |
128 stream.avail_in = uncompressed_bytes; | 128 stream.avail_in = uncompressed_bytes; |
129 stream.next_out = reinterpret_cast<uint8*>(output); | 129 stream.next_out = reinterpret_cast<uint8_t*>(output); |
130 stream.avail_out = max_output_bytes; | 130 stream.avail_out = max_output_bytes; |
131 | 131 |
132 // Do a one-shot compression. This will return Z_STREAM_END only if |output| | 132 // Do a one-shot compression. This will return Z_STREAM_END only if |output| |
133 // is large enough to hold all compressed data. | 133 // is large enough to hold all compressed data. |
134 result = deflate(&stream, Z_FINISH); | 134 result = deflate(&stream, Z_FINISH); |
135 bool success = (result == Z_STREAM_END); | 135 bool success = (result == Z_STREAM_END); |
136 | 136 |
137 if (!success) | 137 if (!success) |
138 DVLOG(2) << "deflate() failed. Result: " << result; | 138 DVLOG(2) << "deflate() failed. Result: " << result; |
139 | 139 |
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181 frame_events, | 181 frame_events, |
182 packet_events, | 182 packet_events, |
183 max_output_bytes, | 183 max_output_bytes, |
184 output, | 184 output, |
185 output_bytes); | 185 output_bytes); |
186 } | 186 } |
187 } | 187 } |
188 | 188 |
189 } // namespace cast | 189 } // namespace cast |
190 } // namespace media | 190 } // namespace media |
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