Using widevine

[salvadordf]

Hi,

The functions, classes and types are present in CEF4Delphi but I haven't tested them.

[salvadordf]

To activate that plugin read the comments in the CEF3 source, here :

https://bitbucket.org/chromiumembedded/ ... ew-default

It's all in the file
/include/capi/cef_web_plugin_capi.h

To register the plugin read this :

Code: Select all

///
// Register the Widevine CDM plugin.
//
// The client application is responsible for downloading an appropriate
// platform-specific CDM binary distribution from Google, extracting the
// contents, and building the required directory structure on the local machine.
// The cef_browser_host_t::StartDownload function and CefZipArchive structure
// can be used to implement this functionality in CEF. Contact Google via
// https://www.widevine.com/contact.html for details on CDM download.
//
// |path| is a directory that must contain the following files:
//   1. manifest.json file from the CDM binary distribution (see below).
//   2. widevinecdm file from the CDM binary distribution (e.g.
//      widevinecdm.dll on on Windows, libwidevinecdm.dylib on OS X,
//      libwidevinecdm.so on Linux).
//   3. widevidecdmadapter file from the CEF binary distribution (e.g.
//      widevinecdmadapter.dll on Windows, widevinecdmadapter.plugin on OS X,
//      libwidevinecdmadapter.so on Linux).
//
// If any of these files are missing or if the manifest file has incorrect
// contents the registration will fail and |callback| will receive a |result|
// value of CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS.
//
// The manifest.json file must contain the following keys:
//   A. "os": Supported OS (e.g. "mac", "win" or "linux").
//   B. "arch": Supported architecture (e.g. "ia32" or "x64").
//   C. "x-cdm-module-versions": Module API version (e.g. "4").
//   D. "x-cdm-interface-versions": Interface API version (e.g. "8").
//   E. "x-cdm-host-versions": Host API version (e.g. "8").
//   F. "version": CDM version (e.g. "1.4.8.903").
//   G. "x-cdm-codecs": List of supported codecs (e.g. "vp8,vp9.0,avc1").
//
// A through E are used to verify compatibility with the current Chromium
// version. If the CDM is not compatible the registration will fail and
// |callback| will receive a |result| value of
// CEF_CDM_REGISTRATION_ERROR_INCOMPATIBLE.
//
// |callback| will be executed asynchronously once registration is complete.
//
// On Linux this function must be called before cef_initialize() and the
// registration cannot be changed during runtime. If registration is not
// supported at the time that cef_register_widevine_cdm() is called then
// |callback| will receive a |result| value of
// CEF_CDM_REGISTRATION_ERROR_NOT_SUPPORTED.
///

[salvadordf]

I just uploaded a couple of functions to make widevine registration a little bit easier if you want to add it to your app :
CefRegisterWidevineCdm and CefFastRegisterWidevineCdm in uCEFMiscFunctions

[Chinyaev]

How correct use it?

I registered widevine after GlobalCEFApp.StartMainProcess
CefFastRegisterWidevineCdm(ExtractFilePath(Application.ExeName) +'cef\WidevineCdm',nil);
In folder I have widevinecdmadapter.dll, manifest.json, widevinecdm.dll

But I get this error
[0123/125602.424:ERROR:widevine_loader.cc(252)] Widevine CDM registration failed;

[salvadordf]

Hi,

I've never registered widevine. Use a callback procedure to know the error code and error text.

If you use CefFastRegisterWidevineCdm then set a TCefRegisterCDMProc procedure for the second parameter.

TCefRegisterCDMProc is defined in uCEFRegisterCDMCallback.pas and the TCefCDMRegistrationError error type is defined in uCEFTypes.

Here you have more info about licensing :
https://github.com/cefsharp/CefSharp/issues/1934

If you succeed, please let us know how!

[Chinyaev]

Thanks for your answer.
I set the OnCDMRegistrationComplete procedure to the second parameter, but after CefFastRegisterWidevineCdm I still get EAccessViolation error and don't get info about the CDM error.

[salvadordf]

I'll take another look at the CEF4DElphi code to see if I missed something importing those functions.

I just read this :
https://bitbucket.org/chromiumembedded/ ... -component

Please, test your Widevine CDM binaries with the official sample application :
http://opensource.spotify.com/cefbuilds ... nt.tar.bz2
http://opensource.spotify.com/cefbuilds ... nt.tar.bz2

I'm not 100% sure but I think this could be the command line to test your binaries with cefclient :

Code: Select all

cefclient.exe --enable-widevine-cdm --cache-path=c:\temp\cache

[Chinyaev]

Hi!

I have problem with Widevine too. And I don't get error code.

I registerWidevine

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if GlobalCEFApp.StartMainProcess then
begin
  CefFastRegisterWidevineCdm(ExtractFilePath(Application.ExeName) +'cef\Widevine',OnCDMRegistrationComplete);
  ...
end;

Code: Select all

procedure OnCDMRegistrationComplete(result: TCefCDMRegistrationError; const error_message: ustring);
begin
  showmessage('error');
end;

I don't can get error code because I get EAccessViolation before OnCDMRegistrationComplete.
EAccessViolation is becase of TCefFastRegisterCdmCallback.Create(callback) as ICefRegisterCdmCallback (if it is replaced by Nil, the EAccessViolation will disappear, but I do not know why the library is not registered)

In log.txt
[0329/193006.900:ERROR:widevine_loader.cc(252)] Widevine CDM registration failed;

manifest.json and library is ok (works in other cef apps)

[salvadordf]

I've added a GlobalCEFApp.WidevinePath property and a GlobalCEFApp.OnCDMRegistrationComplete event to do this automatically.

I can't test it with real Widevine files but the function works and the event is received.

I'll upload this soon...

[Chinyaev]

Thanks for the update! I found a error and fixed it. Now I get CEF_CDM_REGISTRATION_ERROR_NONE, but widevine still doesn't work.
Salvadordf, maybe you will try?
My widevineCdm - https://www.dropbox.com/s/opr5zyzykvhco ... m.zip?dl=0
My code:

Code: Select all

  GlobalCEFApp.AddCustomCommandLine('--enable-widevine-cdm', '');
  GlobalCEFApp.AddCustomCommandLine('--cache-path', ExtractFilePath(ParamStr(0)) + 'cef\cache');
  GlobalCEFApp.OnCDMRegistrationComplete := OnCDMRegistrationComplete;
  GlobalCEFApp.WidevinePath := ExtractFilePath(Application.ExeName) +'cef\WidevineCdm';

  if GlobalCEFApp.StartMainProcess then
  ...

I check status of the widevine on this site - https://bitmovin.com/mpeg-dash-hls-drm-test-player/