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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 "media/cdm/cenc_utils.h" | 5 #include "media/cdm/cenc_utils.h" |
| 6 | 6 |
| 7 #include "base/stl_util.h" | |
| 8 #include "media/formats/mp4/box_definitions.h" | 7 #include "media/formats/mp4/box_definitions.h" |
| 9 #include "media/formats/mp4/box_reader.h" | 8 #include "media/formats/mp4/box_reader.h" |
| 10 | 9 |
| 11 namespace media { | 10 namespace media { |
| 12 | 11 |
| 13 // The initialization data for encrypted media files using the ISO Common | 12 // The initialization data for encrypted media files using the ISO Common |
| 14 // Encryption ('cenc') protection scheme may contain one or more protection | 13 // Encryption ('cenc') protection scheme may contain one or more protection |
| 15 // system specific header ('pssh') boxes. | 14 // system specific header ('pssh') boxes. |
| 16 // ref: https://w3c.github.io/encrypted-media/cenc-format.html | 15 // ref: https://w3c.github.io/encrypted-media/cenc-format.html |
| 17 | 16 |
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| 31 DCHECK(!input.empty()); | 30 DCHECK(!input.empty()); |
| 32 | 31 |
| 33 // Verify that |input| contains only 'pssh' boxes. | 32 // Verify that |input| contains only 'pssh' boxes. |
| 34 // ReadAllChildrenAndCheckFourCC() is templated, so it checks that each | 33 // ReadAllChildrenAndCheckFourCC() is templated, so it checks that each |
| 35 // box in |input| matches the box type of the parameter (in this case | 34 // box in |input| matches the box type of the parameter (in this case |
| 36 // mp4::ProtectionSystemSpecificHeader is a 'pssh' box). | 35 // mp4::ProtectionSystemSpecificHeader is a 'pssh' box). |
| 37 // mp4::ProtectionSystemSpecificHeader doesn't validate the 'pssh' contents, | 36 // mp4::ProtectionSystemSpecificHeader doesn't validate the 'pssh' contents, |
| 38 // so this simply verifies that |input| only contains 'pssh' boxes and | 37 // so this simply verifies that |input| only contains 'pssh' boxes and |
| 39 // nothing else. | 38 // nothing else. |
| 40 scoped_ptr<mp4::BoxReader> input_reader( | 39 scoped_ptr<mp4::BoxReader> input_reader( |
| 41 mp4::BoxReader::ReadConcatentatedBoxes( | 40 mp4::BoxReader::ReadConcatentatedBoxes(input.data(), input.size())); |
| 42 vector_as_array(&input), input.size())); | |
| 43 std::vector<mp4::ProtectionSystemSpecificHeader> raw_pssh_boxes; | 41 std::vector<mp4::ProtectionSystemSpecificHeader> raw_pssh_boxes; |
| 44 if (!input_reader->ReadAllChildrenAndCheckFourCC(&raw_pssh_boxes)) | 42 if (!input_reader->ReadAllChildrenAndCheckFourCC(&raw_pssh_boxes)) |
| 45 return false; | 43 return false; |
| 46 | 44 |
| 47 // Now that we have |input| parsed into |raw_pssh_boxes|, reparse each one | 45 // Now that we have |input| parsed into |raw_pssh_boxes|, reparse each one |
| 48 // into a mp4::FullProtectionSystemSpecificHeader, which extracts all the | 46 // into a mp4::FullProtectionSystemSpecificHeader, which extracts all the |
| 49 // relevant fields from the box. Since there may be unparseable 'pssh' boxes | 47 // relevant fields from the box. Since there may be unparseable 'pssh' boxes |
| 50 // (due to unsupported version, for example), this is done one by one, | 48 // (due to unsupported version, for example), this is done one by one, |
| 51 // ignoring any boxes that can't be parsed. | 49 // ignoring any boxes that can't be parsed. |
| 52 for (const auto& raw_pssh_box : raw_pssh_boxes) { | 50 for (const auto& raw_pssh_box : raw_pssh_boxes) { |
| 53 scoped_ptr<mp4::BoxReader> raw_pssh_reader( | 51 scoped_ptr<mp4::BoxReader> raw_pssh_reader( |
| 54 mp4::BoxReader::ReadConcatentatedBoxes( | 52 mp4::BoxReader::ReadConcatentatedBoxes(raw_pssh_box.raw_box.data(), |
| 55 vector_as_array(&raw_pssh_box.raw_box), | 53 raw_pssh_box.raw_box.size())); |
| 56 raw_pssh_box.raw_box.size())); | |
| 57 // ReadAllChildren() appends any successfully parsed box onto it's | 54 // ReadAllChildren() appends any successfully parsed box onto it's |
| 58 // parameter, so |pssh_boxes| will contain the collection of successfully | 55 // parameter, so |pssh_boxes| will contain the collection of successfully |
| 59 // parsed 'pssh' boxes. If an error occurs, try the next box. | 56 // parsed 'pssh' boxes. If an error occurs, try the next box. |
| 60 if (!raw_pssh_reader->ReadAllChildrenAndCheckFourCC(pssh_boxes)) | 57 if (!raw_pssh_reader->ReadAllChildrenAndCheckFourCC(pssh_boxes)) |
| 61 continue; | 58 continue; |
| 62 } | 59 } |
| 63 | 60 |
| 64 // Must have successfully parsed at least one 'pssh' box. | 61 // Must have successfully parsed at least one 'pssh' box. |
| 65 return pssh_boxes->size() > 0; | 62 return pssh_boxes->size() > 0; |
| 66 } | 63 } |
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| 118 pssh_data->assign(child.data.begin(), child.data.end()); | 115 pssh_data->assign(child.data.begin(), child.data.end()); |
| 119 return true; | 116 return true; |
| 120 } | 117 } |
| 121 } | 118 } |
| 122 | 119 |
| 123 // No matching 'pssh' box found. | 120 // No matching 'pssh' box found. |
| 124 return false; | 121 return false; |
| 125 } | 122 } |
| 126 | 123 |
| 127 } // namespace media | 124 } // namespace media |
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