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Side by Side Diff: media/cast/sender/vp8_quantizer_parser.cc

Issue 1734613003: Move libvpx_new to libvpx (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: rebase Created 4 years, 9 months ago
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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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