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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webcodecs/decrypt_config_util.h"
#include "media/base/decrypt_config.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_decrypt_config.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_encryption_pattern.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_subsample_entry.h"
#include "third_party/blink/renderer/modules/webcodecs/array_buffer_util.h"
namespace blink {
std::unique_ptr<media::DecryptConfig> CreateMediaDecryptConfig(
const DecryptConfig& js_config) {
auto scheme = js_config.encryptionScheme();
if (scheme != "cenc" && scheme != "cbcs") {
return nullptr;
}
auto iv = AsSpan<const char>(js_config.initializationVector());
if (iv.size() != media::DecryptConfig::kDecryptionKeySize) {
return nullptr;
}
std::string iv_str(iv.data(), iv.size());
auto key_id = AsSpan<const char>(js_config.keyId());
std::string key_id_str(key_id.data(), key_id.size());
std::vector<media::SubsampleEntry> subsamples;
for (const auto& entry : js_config.subsampleLayout()) {
subsamples.emplace_back(entry->clearBytes(), entry->cypherBytes());
}
if (scheme == "cenc") {
return media::DecryptConfig::CreateCencConfig(
std::move(key_id_str), std::move(iv_str), subsamples);
}
DCHECK_EQ(scheme, "cbcs");
std::optional<media::EncryptionPattern> encryption_pattern;
if (js_config.hasEncryptionPattern()) {
encryption_pattern.emplace(js_config.encryptionPattern()->cryptByteBlock(),
js_config.encryptionPattern()->skipByteBlock());
}
return media::DecryptConfig::CreateCbcsConfig(
std::move(key_id_str), std::move(iv_str), subsamples, encryption_pattern);
}
std::optional<media::EncryptionScheme> ToMediaEncryptionScheme(
const String& scheme) {
if (scheme == "cenc") {
return media::EncryptionScheme::kCenc;
} else if (scheme == "cbcs") {
return media::EncryptionScheme::kCbcs;
} else {
return std::nullopt;
}
}
} // namespace blink
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