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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef DecoderDoctorDiagnostics_h_
#define DecoderDoctorDiagnostics_h_
#include "MediaResult.h"
#include "mozilla/DefineEnum.h"
#include "mozilla/EnumSet.h"
#include "mozilla/EnumTypeTraits.h"
#include "mozilla/dom/DecoderDoctorNotificationBinding.h"
#include "nsString.h"
namespace mozilla {
namespace dom {
class Document;
struct DecoderDoctorEvent {
enum Domain {
} mDomain;
nsresult mResult;
// DecoderDoctorDiagnostics class, used to gather data from PDMs/DecoderTraits,
// and then notify the user about issues preventing (or worsening) playback.
// The expected usage is:
// 1. Instantiate a DecoderDoctorDiagnostics in a function (close to the point
// where a webpage is trying to know whether some MIME types can be played,
// or trying to play a media file).
// 2. Pass a pointer to the DecoderDoctorDiagnostics structure to one of the
// CanPlayStatus/IsTypeSupported/(others?). During that call, some PDMs may
// add relevant diagnostic information.
// 3. Analyze the collected diagnostics, and optionally dispatch an event to the
// UX, to notify the user about potential playback issues and how to resolve
// them.
// This class' methods must be called from the main thread.
class DecoderDoctorDiagnostics {
friend struct IPC::ParamTraits<mozilla::DecoderDoctorDiagnostics>;
// Store the diagnostic information collected so far on a document for a
// given format. All diagnostics for a document will be analyzed together
// within a short timeframe.
// Should only be called once.
void StoreFormatDiagnostics(dom::Document* aDocument,
const nsAString& aFormat, bool aCanPlay,
const char* aCallSite);
void StoreMediaKeySystemAccess(dom::Document* aDocument,
const nsAString& aKeySystem, bool aIsSupported,
const char* aCallSite);
void StoreEvent(dom::Document* aDocument, const DecoderDoctorEvent& aEvent,
const char* aCallSite);
void StoreDecodeError(dom::Document* aDocument, const MediaResult& aError,
const nsString& aMediaSrc, const char* aCallSite);
void StoreDecodeWarning(dom::Document* aDocument, const MediaResult& aWarning,
const nsString& aMediaSrc, const char* aCallSite);
enum DiagnosticsType {
DiagnosticsType Type() const { return mDiagnosticsType; }
// Description string, for logging purposes; only call on stored diags.
nsCString GetDescription() const;
// Methods to record diagnostic information:
Flags, (CanPlay, WMFFailedToLoad, FFmpegNotFound, LibAVCodecUnsupported,
GMPPDMFailedToStartup, VideoNotSupported, AudioNotSupported));
using FlagsSet = mozilla::EnumSet<Flags>;
const nsAString& Format() const { return mFormat; }
bool CanPlay() const { return mFlags.contains(Flags::CanPlay); }
void SetFailureFlags(const FlagsSet& aFlags) { mFlags = aFlags; }
void SetWMFFailedToLoad() { mFlags += Flags::WMFFailedToLoad; }
bool DidWMFFailToLoad() const {
return mFlags.contains(Flags::WMFFailedToLoad);
void SetFFmpegNotFound() { mFlags += Flags::FFmpegNotFound; }
bool DidFFmpegNotFound() const {
return mFlags.contains(Flags::FFmpegNotFound);
void SetLibAVCodecUnsupported() { mFlags += Flags::LibAVCodecUnsupported; }
bool IsLibAVCodecUnsupported() const {
return mFlags.contains(Flags::LibAVCodecUnsupported);
void SetGMPPDMFailedToStartup() { mFlags += Flags::GMPPDMFailedToStartup; }
bool DidGMPPDMFailToStartup() const {
return mFlags.contains(Flags::GMPPDMFailedToStartup);
void SetVideoNotSupported() { mFlags += Flags::VideoNotSupported; }
void SetAudioNotSupported() { mFlags += Flags::AudioNotSupported; }
void SetGMP(const nsACString& aGMP) { mGMP = aGMP; }
const nsACString& GMP() const { return mGMP; }
const nsAString& KeySystem() const { return mKeySystem; }
bool IsKeySystemSupported() const { return mIsKeySystemSupported; }
enum KeySystemIssue { eUnset, eWidevineWithNoWMF };
void SetKeySystemIssue(KeySystemIssue aKeySystemIssue) {
mKeySystemIssue = aKeySystemIssue;
KeySystemIssue GetKeySystemIssue() const { return mKeySystemIssue; }
DecoderDoctorEvent event() const { return mEvent; }
const MediaResult& DecodeIssue() const { return mDecodeIssue; }
const nsString& DecodeIssueMediaSrc() const { return mDecodeIssueMediaSrc; }
// This method is only used for testing.
void SetDecoderDoctorReportType(const dom::DecoderDoctorReportType& aType);
// Currently-known type of diagnostics. Set from one of the 'Store...'
// methods. This helps ensure diagnostics are only stored once, and makes it
// easy to know what information they contain.
DiagnosticsType mDiagnosticsType = eUnsaved;
nsString mFormat;
FlagsSet mFlags;
nsCString mGMP;
nsString mKeySystem;
bool mIsKeySystemSupported = false;
KeySystemIssue mKeySystemIssue = eUnset;
DecoderDoctorEvent mEvent;
MediaResult mDecodeIssue = NS_OK;
nsString mDecodeIssueMediaSrc;
// Used for IPDL serialization.
// The 'value' have to be the biggest enum from DecoderDoctorDiagnostics::Flags.
template <>
struct MaxEnumValue<::mozilla::DecoderDoctorDiagnostics::Flags> {
static constexpr unsigned int value =
static_cast<unsigned int>(DecoderDoctorDiagnostics::sFlagsCount);
} // namespace mozilla