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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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 #include "base/logging.h" | 5 #include "base/logging.h" |
6 #include "base/macros.h" | 6 #include "base/macros.h" |
7 #include "media/cast/sender/vp8_quantizer_parser.h" | 7 #include "media/cast/sender/vp8_quantizer_parser.h" |
8 | 8 |
9 namespace media { | 9 namespace media { |
10 namespace cast { | 10 namespace cast { |
11 | 11 |
12 namespace { | 12 namespace { |
13 // Vp8BitReader is a re-implementation of a subset of the VP8 entropy decoder. | 13 // Vp8BitReader is a re-implementation of a subset of the VP8 entropy decoder. |
14 // It is used to decompress the VP8 bitstream for the purposes of quickly | 14 // It is used to decompress the VP8 bitstream for the purposes of quickly |
15 // parsing the VP8 frame headers. It is mostly the exact same implementation | 15 // parsing the VP8 frame headers. It is mostly the exact same implementation |
16 // found in third_party/libvpx_new/.../vp8/decoder/dboolhuff.h except that only | 16 // found in third_party/libvpx/.../vp8/decoder/dboolhuff.h except that only |
17 // the portion of the implementation needed to parse the frame headers is | 17 // the portion of the implementation needed to parse the frame headers is |
18 // present. As of this writing, the implementation in libvpx could not be | 18 // present. As of this writing, the implementation in libvpx could not be |
19 // re-used because of the way that the code is structured, and lack of the | 19 // re-used because of the way that the code is structured, and lack of the |
20 // necessary parts being exported. | 20 // necessary parts being exported. |
21 class Vp8BitReader { | 21 class Vp8BitReader { |
22 public: | 22 public: |
23 Vp8BitReader(const uint8_t* data, size_t size) | 23 Vp8BitReader(const uint8_t* data, size_t size) |
24 : encoded_data_(data), encoded_data_end_(data + size) { | 24 : encoded_data_(data), encoded_data_end_(data + size) { |
25 Vp8DecoderReadBytes(); | 25 Vp8DecoderReadBytes(); |
26 } | 26 } |
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201 // Parse the base q_index. | 201 // Parse the base q_index. |
202 uint8_t q_index = static_cast<uint8_t>(bit_reader.DecodeValue(7)); | 202 uint8_t q_index = static_cast<uint8_t>(bit_reader.DecodeValue(7)); |
203 if (q_index > 127) { | 203 if (q_index > 127) { |
204 return 63; | 204 return 63; |
205 } | 205 } |
206 return vp8_quantizer_lookup[q_index]; | 206 return vp8_quantizer_lookup[q_index]; |
207 } | 207 } |
208 | 208 |
209 } // namespace cast | 209 } // namespace cast |
210 } // namespace media | 210 } // namespace media |
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