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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This defines the mojo interface used between the Chrome browser and Chrome
// GPU process, as well as between the ash-chrome browser and lacros-chrome
// browser process for creating a CDM factory that will utilizes native HW
// backed DRM protection for ChromeOS.
// Next MinVersion: 4
module chromeos.cdm.mojom;
import "chromeos/components/cdm_factory_daemon/mojom/cdm_factory_daemon.mojom";
import "chromeos/components/cdm_factory_daemon/mojom/content_decryption_module.mojom";
import "chromeos/components/cdm_factory_daemon/mojom/output_protection.mojom";
import "sandbox/policy/mojom/sandbox.mojom";
import "ui/gfx/geometry/mojom/geometry.mojom";
// Next Method ID: 7
// Used for the connection between browser (receiver) and GPU (remote) process;
// or between the ash (receiver) and lacros (remote) browser processes; or
// between the GPU (receiver) and OOP video decoder (remote) processes as a
// proxy back to the browser.
// TODO(jkardatzke): Replace all of the calls that proxy to the CdmFactoryDaemon
// interface with another Mojo interface that we acquire directly from the
// CdmFactoryDaemon to avoid having all these proxied calls.
[Stable, Uuid="7b6bba3b-5ff8-42c7-a802-40a848945b16",
ServiceSandbox=sandbox.mojom.Sandbox.kGpu]
interface BrowserCdmFactory {
// Used to create CdmFactory interfaces which are then used to create a CDM
// interface. |key_system| should specify what key system we are using,
// currently only com.widevine.alpha is supported. Returns null if we can't
// get the interface from the daemon.
// NOTE: This will proxy to the CdmFactoryDaemon interface which is
// implemented by the cdm-oemcrypto daemon in ChromeOS.
CreateFactory@0(string key_system) => (pending_remote<CdmFactory>? factory);
// Creates a new OutputProtection interface to be used for passing into the
// CreateCdm call in CdmFactory.
GetOutputProtection@1(pending_receiver<OutputProtection> output_protection);
// Returns binary configuration data used for setting up HW decrypt+decode. If
// successful, |success| will be true and |config_data| will be valid.
// Otherwise |success| will be false and |config_data| should not be used.
// NOTE: This will proxy to the CdmFactoryDaemon interface which is
// implemented by the cdm-oemcrypto daemon in ChromeOS.
GetHwConfigData@2() => (bool success, array<uint8> config_data);
// Returns an array of the screen resolutions of all the connected displays.
GetScreenResolutions@3() => (array<gfx.mojom.Size> resolutions);
// Returns the wrapped key for injecting into the video decoder when doing ARC
// playback. This mirrors the ContentDecryptionModule::GetHwKeyData call as
// they serve the same purpose (Chrome will invoke this one for Android
// playback and ContentDecryptionModule::GetHwKeyData for Chrome playback).
// NOTE: This will proxy to the CdmFactoryDaemon interface which is
// implemented by the cdm-oemcrypto daemon in ChromeOS.
[MinVersion=1]
GetAndroidHwKeyData@4(array<uint8> key_id, array<uint8> hw_identifier) =>
(DecryptStatus status, array<uint8> key_data);
// Allocates a secure buffer in TrustZone on ARM platforms. The lifetime of
// this buffer is managed by the returned fd. This should be resolved to a
// secure handle through V4L2; the resulting secure handle can then be used
// for the target of decryption. If the allocation fails, a null handle is
// returned.
// NOTE: This will proxy to the CdmFactoryDaemon interface which is
// implemented by the cdm-oemcrypto daemon in ChromeOS.
[MinVersion=2]
AllocateSecureBuffer@5(uint32 size) => (handle<platform>? fd);
// Parses the data in the secure buffer referenced by |secure_handle| at
// |offset| bytes into it as an H264 slice header. |stream_data| should
// contain the required SPS/PPS structure defined in Chrome and the Trusted
// Application. Returns a bool for success/fail and on success the array will
// be populated with the slice header structure.
// NOTE: This will proxy to the CdmFactoryDaemon interface which is
// implemented by the cdm-oemcrypto daemon in ChromeOS. We do not establish
// the structures in Mojo because we are not using Mojo in the end-to-end
// communication.
[MinVersion=3]
ParseEncryptedSliceHeader@6(uint64 secure_handle, uint32 offset,
array<uint8> stream_data) =>
(bool success, array<uint8> slice_header);
};
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