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diff -up firefox-102.0/media/ffvpx/config_common.h.dav1d-remove firefox-102.0/media/ffvpx/config_common.h
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--- firefox-102.0/media/ffvpx/config_common.h.dav1d-remove	2022-08-08 12:48:33.218128539 +0200
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+++ firefox-102.0/media/ffvpx/config_common.h	2022-08-08 12:48:52.986003374 +0200
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@@ -24,15 +24,11 @@
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 #undef CONFIG_VP8_VAAPI_HWACCEL
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 #undef CONFIG_VP9_VAAPI_HWACCEL
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 #undef CONFIG_AV1_VAAPI_HWACCEL
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-#undef CONFIG_LIBDAV1D
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-#undef CONFIG_AV1_DECODER
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 #define CONFIG_VAAPI 1
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 #define CONFIG_VAAPI_1 1
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 #define CONFIG_VP8_VAAPI_HWACCEL 1
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 #define CONFIG_VP9_VAAPI_HWACCEL 1
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 #define CONFIG_AV1_VAAPI_HWACCEL 1
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-#define CONFIG_LIBDAV1D 1
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-#define CONFIG_AV1_DECODER 1
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 #endif
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 #endif
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diff -up firefox-102.0/media/ffvpx/libavcodec/moz.build.dav1d-remove firefox-102.0/media/ffvpx/libavcodec/moz.build
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--- firefox-102.0/media/ffvpx/libavcodec/moz.build.dav1d-remove	2022-08-08 12:44:24.098710736 +0200
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+++ firefox-102.0/media/ffvpx/libavcodec/moz.build	2022-08-08 12:46:42.635828719 +0200
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@@ -104,17 +104,23 @@ if not CONFIG['MOZ_FFVPX_AUDIOONLY']:
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     ]
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     if CONFIG['MOZ_WAYLAND']:
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         LOCAL_INCLUDES += ['/media/mozva']
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+        if CONFIG['MOZ_DAV1D_ASM']:
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+            SOURCES += [
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+                'libdav1d.c',
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+            ]
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         SOURCES += [
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             'atsc_a53.c',
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-            'libdav1d.c',
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             'vaapi_av1.c',
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             'vaapi_decode.c',
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             'vaapi_vp8.c',
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             'vaapi_vp9.c',
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         ]
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+        if CONFIG['MOZ_DAV1D_ASM']:
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+            USE_LIBS += [
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+                'dav1d',
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+                'media_libdav1d_asm',
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+            ]
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         USE_LIBS += [
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-          'dav1d',
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-          'media_libdav1d_asm',
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           'mozva'
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         ]
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