avcodec/evc_decoder: Provided support for EVC decoder

- Added EVC decoder wrapper
- Changes in project configuration file and libavcodec Makefile
- Added documentation for xevd wrapper
Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com>
Signed-off-by: James Almer <jamrial@gmail.com>

configure

@@ -290,6 +290,7 @@ External library support:
   --enable-libx264         enable H.264 encoding via x264 [no]
   --enable-libx265         enable HEVC encoding via x265 [no]
   --enable-libxeve         enable EVC encoding via libxeve [no]
+  --enable-libxevd         enable EVC decoding via libxevd [no]
   --enable-libxavs         enable AVS encoding via xavs [no]
   --enable-libxavs2        enable AVS2 encoding via xavs2 [no]
   --enable-libxcb          enable X11 grabbing using XCB [autodetect]
@@ -1902,6 +1903,7 @@ EXTERNAL_LIBRARY_LIST="
     libvorbis
     libvpx
     libwebp
+    libxevd
     libxeve
     libxml2
     libzimg
@@ -3460,6 +3462,7 @@ libx265_encoder_deps="libx265"
 libx265_encoder_select="atsc_a53"
 libxavs_encoder_deps="libxavs"
 libxavs2_encoder_deps="libxavs2"
+libxevd_decoder_deps="libxevd"
 libxeve_encoder_deps="libxeve"
 libxvid_encoder_deps="libxvid"
 libzvbi_teletext_decoder_deps="libzvbi"
@@ -6875,6 +6878,7 @@ enabled libx265           && require_pkg_config libx265 x265 x265.h x265_api_get
                              require_cpp_condition libx265 x265.h "X265_BUILD >= 89"
 enabled libxavs           && require libxavs "stdint.h xavs.h" xavs_encoder_encode "-lxavs $pthreads_extralibs $libm_extralibs"
 enabled libxavs2          && require_pkg_config libxavs2 "xavs2 >= 1.3.0" "stdint.h xavs2.h" xavs2_api_get
+enabled libxevd           && require_pkg_config libxevd "xevd >= 0.4.1" "xevd.h" xevd_decode
 enabled libxeve           && require_pkg_config libxeve "xeve >= 0.4.3" "xeve.h" xeve_encode
 enabled libxvid           && require libxvid xvid.h xvid_global -lxvidcore
 enabled libzimg           && require_pkg_config libzimg "zimg >= 2.7.0" zimg.h zimg_get_api_version

doc/decoders.texi

@@ -130,6 +130,30 @@ Set amount of frame threads to use during decoding. The default value is 0 (auto
 
 @end table
 
+@section libxevd
+
+eXtra-fast Essential Video Decoder (XEVD) MPEG-5 EVC decoder wrapper.
+
+This decoder requires the presence of the libxevd headers and library
+during configuration. You need to explicitly configure the build with
+@option{--enable-libxevd}.
+
+The xevd project website is at @url{https://github.com/mpeg5/xevd}.
+
+@subsection Options
+
+The following options are supported by the libxevd wrapper.
+The xevd-equivalent options or values are listed in parentheses for easy migration.
+
+To get a more accurate and extensive documentation of the libxevd options,
+invoke the command  @code{xevd_app --help} or consult the libxevd documentation.
+
+@table @option
+@item threads (@emph{threads})
+Force to use a specific number of threads
+
+@end table
+
 @section QSV Decoders
 
 The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC,

doc/general_contents.texi

@@ -351,6 +351,14 @@ Go to @url{https://github.com/mpeg5/xeve} and follow the instructions for
 installing the XEVE library. Then pass @code{--enable-libxeve} to configure to
 enable it.
 
+@section eXtra-fast Essential Video Decoder (XEVD)
+
+FFmpeg can make use of the XEVD library for EVC video decoding.
+
+Go to @url{https://github.com/mpeg5/xevd} and follow the instructions for
+installing the XEVD library. Then pass @code{--enable-libxevd} to configure to
+enable it.
+
 @section ZVBI
 
 ZVBI is a VBI decoding library which can be used by FFmpeg to decode DVB
@@ -606,7 +614,7 @@ library:
 @item raw DTS                   @tab X @tab X
 @item raw DTS-HD                @tab   @tab X
 @item raw E-AC-3                @tab X @tab X
-@item raw EVC                   @tab X @tab
+@item raw EVC                   @tab X @tab X
 @item raw FLAC                  @tab X @tab X
 @item raw GSM                   @tab   @tab X
 @item raw H.261                 @tab X @tab X
@@ -953,8 +961,8 @@ following image formats are supported:
 @item Electronic Arts TQI video  @tab     @tab  X
 @item Escape 124             @tab     @tab  X
 @item Escape 130             @tab     @tab  X
-@item EVC / MPEG-5 Part 1    @tab  E  @tab
-    @tab encoding supported through external library libxeve
+@item EVC / MPEG-5 Part 1    @tab  E  @tab  E
+    @tab encoding and decoding supported through external libraries libxeve and libxevd
 @item FFmpeg video codec #1  @tab  X  @tab  X
     @tab lossless codec (fourcc: FFV1)
 @item Flash Screen Video v1  @tab  X  @tab  X

libavcodec/Makefile

@@ -1149,6 +1149,7 @@ OBJS-$(CONFIG_LIBX264_ENCODER)            += libx264.o
 OBJS-$(CONFIG_LIBX265_ENCODER)            += libx265.o
 OBJS-$(CONFIG_LIBXAVS_ENCODER)            += libxavs.o
 OBJS-$(CONFIG_LIBXAVS2_ENCODER)           += libxavs2.o
+OBJS-$(CONFIG_LIBXEVD_DECODER)            += libxevd.o
 OBJS-$(CONFIG_LIBXEVE_ENCODER)            += libxeve.o
 OBJS-$(CONFIG_LIBXVID_ENCODER)            += libxvid.o
 OBJS-$(CONFIG_LIBZVBI_TELETEXT_DECODER)   += libzvbi-teletextdec.o ass.o

libavcodec/allcodecs.c

@@ -822,6 +822,7 @@ extern LIBX264_CONST FFCodec ff_libx264_encoder;
 extern const FFCodec ff_libx264rgb_encoder;
 extern FFCodec ff_libx265_encoder;
 extern const FFCodec ff_libxeve_encoder;
+extern const FFCodec ff_libxevd_decoder;
 extern const FFCodec ff_libxavs_encoder;
 extern const FFCodec ff_libxavs2_encoder;
 extern const FFCodec ff_libxvid_encoder;