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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 #include "media/formats/mp4/cenc.h" | 5 #include "media/formats/mp4/cenc.h" |
| 6 | 6 |
| 7 #include <cstring> | 7 #include <cstring> |
| 8 | 8 |
| 9 #include "media/formats/mp4/box_reader.h" | 9 #include "media/formats/mp4/box_reader.h" |
| 10 #include "media/formats/mp4/rcheck.h" | 10 #include "media/formats/mp4/rcheck.h" |
| 11 | 11 |
| 12 namespace media { | 12 namespace media { |
| 13 namespace mp4 { | 13 namespace mp4 { |
| 14 | 14 |
| 15 FrameCENCInfo::FrameCENCInfo() {} | 15 FrameCENCInfo::FrameCENCInfo() {} |
| 16 FrameCENCInfo::~FrameCENCInfo() {} | 16 FrameCENCInfo::~FrameCENCInfo() {} |
| 17 | 17 |
| 18 bool FrameCENCInfo::Parse(int iv_size, BufferReader* reader) { | 18 bool FrameCENCInfo::Parse(int iv_size, BufferReader* reader) { |
| 19 const int kEntrySize = 6; | 19 const int kEntrySize = 6; |
| 20 // Mandated by CENC spec | 20 // Mandated by CENC spec |
| 21 RCHECK(iv_size == 8 || iv_size == 16); | 21 RCHECK(iv_size == 8 || iv_size == 16); |
| 22 | 22 |
| 23 memset(iv, 0, sizeof(iv)); | 23 memset(iv, 0, sizeof(iv)); |
| 24 for (int i = 0; i < iv_size; i++) | 24 for (int i = 0; i < iv_size; i++) |
| 25 RCHECK(reader->Read1(&iv[i])); | 25 RCHECK(reader->Read1(&iv[i])); |
| 26 | 26 |
| 27 if (!reader->HasBytes(1)) return true; | 27 if (!reader->HasBytes(1)) return true; |
| 28 | 28 |
| 29 uint16 subsample_count; | 29 uint16_t subsample_count; |
| 30 RCHECK(reader->Read2(&subsample_count) && | 30 RCHECK(reader->Read2(&subsample_count) && |
| 31 reader->HasBytes(subsample_count * kEntrySize)); | 31 reader->HasBytes(subsample_count * kEntrySize)); |
| 32 | 32 |
| 33 subsamples.resize(subsample_count); | 33 subsamples.resize(subsample_count); |
| 34 for (int i = 0; i < subsample_count; i++) { | 34 for (int i = 0; i < subsample_count; i++) { |
| 35 uint16 clear_bytes; | 35 uint16_t clear_bytes; |
| 36 uint32 cypher_bytes; | 36 uint32_t cypher_bytes; |
| 37 RCHECK(reader->Read2(&clear_bytes) && | 37 RCHECK(reader->Read2(&clear_bytes) && |
| 38 reader->Read4(&cypher_bytes)); | 38 reader->Read4(&cypher_bytes)); |
| 39 subsamples[i].clear_bytes = clear_bytes; | 39 subsamples[i].clear_bytes = clear_bytes; |
| 40 subsamples[i].cypher_bytes = cypher_bytes; | 40 subsamples[i].cypher_bytes = cypher_bytes; |
| 41 } | 41 } |
| 42 return true; | 42 return true; |
| 43 } | 43 } |
| 44 | 44 |
| 45 bool FrameCENCInfo::GetTotalSizeOfSubsamples(size_t* total_size) const { | 45 bool FrameCENCInfo::GetTotalSizeOfSubsamples(size_t* total_size) const { |
| 46 size_t size = 0; | 46 size_t size = 0; |
| 47 for (size_t i = 0; i < subsamples.size(); i++) { | 47 for (size_t i = 0; i < subsamples.size(); i++) { |
| 48 size += subsamples[i].clear_bytes; | 48 size += subsamples[i].clear_bytes; |
| 49 RCHECK(size >= subsamples[i].clear_bytes); // overflow | 49 RCHECK(size >= subsamples[i].clear_bytes); // overflow |
| 50 size += subsamples[i].cypher_bytes; | 50 size += subsamples[i].cypher_bytes; |
| 51 RCHECK(size >= subsamples[i].cypher_bytes); // overflow | 51 RCHECK(size >= subsamples[i].cypher_bytes); // overflow |
| 52 } | 52 } |
| 53 *total_size = size; | 53 *total_size = size; |
| 54 return true; | 54 return true; |
| 55 } | 55 } |
| 56 | 56 |
| 57 } // namespace mp4 | 57 } // namespace mp4 |
| 58 } // namespace media | 58 } // namespace media |
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