[vlc-commits] [Git][videolan/vlc][master] mft: list the available decoders

[Jean-Baptiste Kempf (@jbk)]

Jean-Baptiste Kempf pushed to branch master at VideoLAN / VLC


Commits:
aeb1114c by Steve Lhomme at 2023-06-26T12:20:21+00:00
mft: list the available decoders

This can be useful to check what the system can and cannot do.

In debug builds we also test if the transform can be loaded. It can take
a bit of time to activate the transform, so it's better not to do it in
release builds.

- - - - -


1 changed file:

- modules/codec/mft.cpp


Changes:

=====================================
modules/codec/mft.cpp
=====================================
@@ -33,6 +33,7 @@
 #include <vlc_common.h>
 #include <vlc_plugin.h>
 #include <vlc_codec.h>
+#include <vlc_charset.h> /* FromWide */
 extern "C" {
 #include "hxxx_helper.h"
 }
@@ -1485,6 +1486,43 @@ static void DestroyMFT(decoder_t *p_dec)
         hxxx_helper_clean(&p_sys->hh);
 }
 
+static int ListTransforms(decoder_t *p_dec, GUID category, const char *type)
+{
+    HRESULT hr;
+
+    UINT32 flags = MFT_ENUM_FLAG_SORTANDFILTER | MFT_ENUM_FLAG_LOCALMFT
+                 | MFT_ENUM_FLAG_SYNCMFT | MFT_ENUM_FLAG_ASYNCMFT
+                 | MFT_ENUM_FLAG_HARDWARE;
+    IMFActivate **activate_objects = NULL;
+    UINT32 count = 0;
+    hr = MFTEnumEx(category, flags, nullptr, nullptr, &activate_objects, &count);
+    msg_Dbg(p_dec, "Listing %u %s%s", count, type, (count?"s":""));
+    if (FAILED(hr))
+        return VLC_EGENERIC;
+
+    for (UINT32 o=0; o<count; o++)
+    {
+        WCHAR Name[256];
+        hr = activate_objects[o]->GetString(MFT_FRIENDLY_NAME_Attribute, Name, ARRAY_SIZE(Name), nullptr);
+        if (FAILED(hr))
+            wcscpy(Name,L"<unknown>");
+        char *name = FromWide(Name);
+
+#ifndef NDEBUG
+        ComPtr<IMFTransform> mft;
+        hr = activate_objects[o]->ActivateObject(IID_PPV_ARGS(mft.GetAddressOf()));
+        msg_Dbg(p_dec, "%s '%s' is%s available", type, name, (FAILED(hr)?" not":""));
+        mft.Reset();
+#else
+        msg_Dbg(p_dec, "found %s '%s'", type, name);
+#endif
+        free(name);
+        activate_objects[o]->ShutdownObject();
+    }
+
+    return VLC_SUCCESS;
+}
+
 static int FindMFT(decoder_t *p_dec)
 {
     mft_dec_sys_t *p_sys = static_cast<mft_dec_sys_t*>(p_dec->p_sys);
@@ -1513,6 +1551,11 @@ static int FindMFT(decoder_t *p_dec)
     if (input_type.guidSubtype == GUID_NULL)
         return VLC_EGENERIC;
 
+    if (p_dec->fmt_in->i_cat == VIDEO_ES)
+        ListTransforms(p_dec, MFT_CATEGORY_VIDEO_DECODER, "video decoder");
+    else
+        ListTransforms(p_dec, MFT_CATEGORY_VIDEO_DECODER, "audio decoder");
+
     UINT32 flags = MFT_ENUM_FLAG_SORTANDFILTER | MFT_ENUM_FLAG_LOCALMFT
                  | MFT_ENUM_FLAG_SYNCMFT | MFT_ENUM_FLAG_ASYNCMFT
                  | MFT_ENUM_FLAG_HARDWARE;



View it on GitLab: https://code.videolan.org/videolan/vlc/-/commit/aeb1114c9091a6b1c612e166d0fc565a6cd9285e

-- 
View it on GitLab: https://code.videolan.org/videolan/vlc/-/commit/aeb1114c9091a6b1c612e166d0fc565a6cd9285e
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