avcodec/evc_encoder: Provided support for EVC encoder

- Added EVC encoder wrapper
- Changes in project configuration file and libavcodec Makefile
- Added documentation for xeve wrapper

Signed-off-by: Dawid Kozinski <d.kozinski@samsung.com>
Signed-off-by: James Almer <jamrial@gmail.com>

6 files changed, 702 insertions, 0 deletions

diff --git a/configure b/configure
index 6be849fc08..f678ee85b7 100755
--- a/configure
+++ b/configure
@@ -289,6 +289,7 @@ External library support:
   --enable-libwebp         enable WebP encoding via libwebp [no]
   --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-libxavs         enable AVS encoding via xavs [no]
   --enable-libxavs2        enable AVS2 encoding via xavs2 [no]
   --enable-libxcb          enable X11 grabbing using XCB [autodetect]
@@ -1901,6 +1902,7 @@ EXTERNAL_LIBRARY_LIST="
     libvorbis
     libvpx
     libwebp
+    libxeve
     libxml2
     libzimg
     libzmq
@@ -3458,6 +3460,7 @@ libx265_encoder_deps="libx265"
 libx265_encoder_select="atsc_a53"
 libxavs_encoder_deps="libxavs"
 libxavs2_encoder_deps="libxavs2"
+libxeve_encoder_deps="libxeve"
 libxvid_encoder_deps="libxvid"
 libzvbi_teletext_decoder_deps="libzvbi"
 vapoursynth_demuxer_deps="vapoursynth"
@@ -6872,6 +6875,7 @@ 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 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
 enabled libzmq            && require_pkg_config libzmq "libzmq >= 4.2.1" zmq.h zmq_ctx_new
diff --git a/doc/encoders.texi b/doc/encoders.texi
index 8b2ab937d1..27a9acf076 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -2911,6 +2911,75 @@ ffmpeg -i input -c:v libxavs2 -xavs2-params RdoqLevel=0 output.avs2
 @end example
 @end table
 
+@section libxeve
+
+eXtra-fast Essential Video Encoder (XEVE) MPEG-5 EVC encoder wrapper.
+The xeve-equivalent options or values are listed in parentheses for easy migration.
+
+This encoder requires the presence of the libxeve headers and library
+during configuration. You need to explicitly configure the build with
+@option{--enable-libxeve}.
+
+@float NOTE
+Many libxeve encoder options are mapped to FFmpeg global codec options,
+while unique encoder options are provided through private options.
+Additionally the xeve-params private options allows one to pass a list
+of key=value tuples as accepted by the libxeve @code{parse_xeve_params} function.
+@end float
+
+The xeve project website is at @url{https://github.com/mpeg5/xeve}.
+
+@subsection Options
+
+The following options are supported by the libxeve wrapper.
+The xeve-equivalent options or values are listed in parentheses for easy migration.
+
+@float NOTE
+To reduce the duplication of documentation, only the private options
+and some others requiring special attention are documented here. For
+the documentation of the undocumented generic options, see
+@ref{codec-options,,the Codec Options chapter}.
+@end float
+
+@float NOTE
+To get a more accurate and extensive documentation of the libxeve options,
+invoke the command  @code{xeve_app --help} or consult the libxeve documentation.
+@end float
+
+@table @option
+@item b (@emph{bitrate})
+Set target video bitrate in bits/s.
+Note that FFmpeg's b option is expressed in bits/s, while xeve's bitrate is in kilobits/s.
+
+@item bf (@emph{bframes})
+Set the maximum number of B frames (1,3,7,15).
+
+@item g (@emph{keyint})
+Set the GOP size (I-picture period).
+
+@item preset (@emph{preset})
+Set the xeve preset.
+Set the encoder preset value to determine encoding speed [fast, medium, slow, placebo]
+
+@item tune (@emph{tune})
+Set the encoder tune parameter [psnr, zerolatency]
+
+@item profile (@emph{profile})
+Set the encoder profile [0: baselie; 1: main]
+
+@item crf (@emph{crf})
+Set the quality for constant quality mode.
+Constant rate factor <10..49> [default: 32]
+
+@item qp (@emph{qp})
+Set constant quantization rate control method parameter.
+Quantization parameter qp <0..51> [default: 32]
+
+@item threads (@emph{threads})
+Force to use a specific number of threads
+
+@end table
+
 @section libxvid
 
 Xvid MPEG-4 Part 2 encoder wrapper.
diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index 62ca4f7cb6..58503bb495 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -343,6 +343,14 @@ libxavs2 is under the GNU Public License Version 2 or later
 details), you must upgrade FFmpeg's license to GPL in order to use it.
 @end float
 
+@section eXtra-fast Essential Video Encoder (XEVE)
+
+FFmpeg can make use of the XEVE library for EVC video encoding.
+
+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 ZVBI
 
 ZVBI is a VBI decoding library which can be used by FFmpeg to decode DVB
@@ -598,6 +606,7 @@ 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 FLAC                  @tab X @tab X
 @item raw GSM                   @tab   @tab X
 @item raw H.261                 @tab X @tab X
@@ -944,6 +953,8 @@ 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 FFmpeg video codec #1  @tab  X  @tab  X
     @tab lossless codec (fourcc: FFV1)
 @item Flash Screen Video v1  @tab  X  @tab  X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index a6dff5e61b..5571f5e414 100644
--- a/libavcodec/Makefile
+++ b/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-$(CONFIG_LIBXEVE_ENCODER)            += libxeve.o
 OBJS-$(CONFIG_LIBXVID_ENCODER)            += libxvid.o
 OBJS-$(CONFIG_LIBZVBI_TELETEXT_DECODER)   += libzvbi-teletextdec.o ass.o
 
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 2662adb754..7f786e45cd 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -821,6 +821,7 @@ extern LIBX264_CONST FFCodec ff_libx264_encoder;
 #endif
 extern const FFCodec ff_libx264rgb_encoder;
 extern FFCodec ff_libx265_encoder;
+extern const FFCodec ff_libxeve_encoder;
 extern const FFCodec ff_libxavs_encoder;
 extern const FFCodec ff_libxavs2_encoder;
 extern const FFCodec ff_libxvid_encoder;
diff --git a/libavcodec/libxeve.c b/libavcodec/libxeve.c
new file mode 100644
index 0000000000..c10b7de023
--- /dev/null
+++ b/libavcodec/libxeve.c
@@ -0,0 +1,616 @@
+/*
+ * libxeve encoder
+ * EVC (MPEG-5 Essential Video Coding) encoding using XEVE MPEG-5 EVC encoder library
+ *
+ * Copyright (C) 2021 Dawid Kozinski <d.kozinski@samsung.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <float.h>
+#include <stdlib.h>
+
+#include <xeve.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/common.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/pixfmt.h"
+#include "libavutil/time.h"
+#include "libavutil/cpu.h"
+#include "libavutil/avstring.h"
+
+#include "avcodec.h"
+#include "internal.h"
+#include "packet_internal.h"
+#include "codec_internal.h"
+#include "profiles.h"
+#include "encode.h"
+
+#define MAX_BS_BUF (16*1024*1024)
+
+/**
+ * Error codes
+ */
+#define XEVE_PARAM_BAD_NAME -100
+#define XEVE_PARAM_BAD_VALUE -200
+
+/**
+ * Encoder states
+ *
+ * STATE_ENCODING - the encoder receives and processes input frames
+ * STATE_BUMPING  - there are no more input frames, however the encoder still processes previously received data
+ */
+typedef enum State {
+    STATE_ENCODING,
+    STATE_BUMPING,
+} State;
+
+/**
+ * The structure stores all the states associated with the instance of Xeve MPEG-5 EVC encoder
+ */
+typedef struct XeveContext {
+    const AVClass *class;
+
+    XEVE id;            // XEVE instance identifier
+    XEVE_CDSC cdsc;     // coding parameters i.e profile, width & height of input frame, num of therads, frame rate ...
+    XEVE_BITB bitb;     // bitstream buffer (output)
+    XEVE_STAT stat;     // encoding status (output)
+    XEVE_IMGB imgb;     // image buffer (input)
+
+    State state;        // encoder state (skipping, encoding, bumping)
+
+    int profile_id;     // encoder profile (main, baseline)
+    int preset_id;      // preset of xeve ( fast, medium, slow, placebo)
+    int tune_id;        // tune of xeve (psnr, zerolatency)
+
+    // variables for rate control modes
+    int rc_mode;        // Rate control mode [ 0(CQP) / 1(ABR) / 2(CRF) ]
+    int qp;             // quantization parameter (QP) [0,51]
+    int crf;            // constant rate factor (CRF) [10,49]
+
+    int hash;           // embed picture signature (HASH) for conformance checking in decoding
+    int sei_info;       // embed Supplemental enhancement information while encoding
+
+    int color_format;   // input data color format: currently only XEVE_CF_YCBCR420 is supported
+
+    AVDictionary *xeve_params;
+} XeveContext;
+
+/**
+ * Convert FFmpeg pixel format (AVPixelFormat) to XEVE pre-defined color format
+ *
+ * @param[in]  av_pix_fmt pixel format (@see https://ffmpeg.org/doxygen/trunk/pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5)
+ * @param[out] xeve_col_fmt XEVE pre-defined color format (@see xeve.h)
+ *
+ * @return 0 on success, negative value on failure
+ */
+static int libxeve_color_fmt(enum AVPixelFormat av_pix_fmt, int *xeve_col_fmt)
+{
+    switch (av_pix_fmt) {
+    case AV_PIX_FMT_YUV420P:
+        *xeve_col_fmt = XEVE_CF_YCBCR420;
+        break;
+    case AV_PIX_FMT_YUV420P10:
+        *xeve_col_fmt = XEVE_CF_YCBCR420;
+        break;
+    default:
+        *xeve_col_fmt = XEVE_CF_UNKNOWN;
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+/**
+ * Convert FFmpeg pixel format (AVPixelFormat) into XEVE pre-defined color space
+ *
+ * @param[in] px_fmt pixel format (@see https://ffmpeg.org/doxygen/trunk/pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5)
+ *
+ * @return XEVE pre-defined color space (@see xeve.h) on success, XEVE_CF_UNKNOWN on failure
+ */
+static int libxeve_color_space(enum AVPixelFormat av_pix_fmt)
+{
+    /* color space of input image */
+    int cs = XEVE_CF_UNKNOWN;
+
+    switch (av_pix_fmt) {
+    case AV_PIX_FMT_YUV420P:
+        cs = XEVE_CS_YCBCR420;
+        break;
+    case AV_PIX_FMT_YUV420P10:
+#if AV_HAVE_BIGENDIAN
+        cs = XEVE_CS_SET(XEVE_CF_YCBCR420, 10, 1);
+#else
+        cs = XEVE_CS_YCBCR420_10LE;
+#endif
+
+        break;
+    default:
+        cs = XEVE_CF_UNKNOWN;
+        break;
+    }
+
+    return cs;
+}
+
+/**
+ * The function returns a pointer to the object of the XEVE_CDSC type.
+ * XEVE_CDSC contains all encoder parameters that should be initialized before the encoder is used.
+ *
+ * The field values of the XEVE_CDSC structure are populated based on:
+ * - the corresponding field values of the AvCodecConetxt structure,
+ * - the xeve encoder specific option values,
+ *   (the full list of options available for xeve encoder is displayed after executing the command ./ffmpeg --help encoder = libxeve)
+ *
+ * The order of processing input data and populating the XEVE_CDSC structure
+ * 1) first, the fields of the AVCodecContext structure corresponding to the provided input options are processed,
+ *    (i.e -pix_fmt yuv420p -s:v 1920x1080 -r 30 -profile:v 0)
+ * 2) then xeve-specific options added as AVOption to the xeve AVCodec implementation
+ *    (i.e -preset 0)
+ *
+ * Keep in mind that, there are options that can be set in different ways.
+ * In this case, please follow the above-mentioned order of processing.
+ * The most recent assignments overwrite the previous values.
+ *
+ * @param[in] avctx codec context (AVCodecContext)
+ * @param[out] cdsc contains all Xeve MPEG-5 EVC encoder encoder parameters that should be initialized before the encoder is use
+ *
+ * @return 0 on success, negative error code on failure
+ */
+static int get_conf(AVCodecContext *avctx, XEVE_CDSC *cdsc)
+{
+    XeveContext *xectx = NULL;
+    int ret;
+
+    xectx = avctx->priv_data;
+
+    /* initialize xeve_param struct with default values */
+    ret = xeve_param_default(&cdsc->param);
+    if (XEVE_FAILED(ret)) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot set_default parameter\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    /* read options from AVCodecContext */
+    if (avctx->width > 0)
+        cdsc->param.w = avctx->width;
+
+    if (avctx->height > 0)
+        cdsc->param.h = avctx->height;
+
+    if (avctx->framerate.num > 0) {
+        // fps can be float number, but xeve API doesn't support it
+        cdsc->param.fps = lrintf(av_q2d(avctx->framerate));
+    }
+
+    // GOP size (key-frame interval, I-picture period)
+    cdsc->param.keyint = avctx->gop_size; // 0: only one I-frame at the first time; 1: every frame is coded in I-frame
+
+    if (avctx->max_b_frames == 0 || avctx->max_b_frames == 1 || avctx->max_b_frames == 3 ||
+        avctx->max_b_frames == 7 || avctx->max_b_frames == 15)   // number of b-frames
+        cdsc->param.bframes = avctx->max_b_frames;
+    else {
+        av_log(avctx, AV_LOG_ERROR, "Incorrect value for maximum number of B frames: (%d) \n"
+               "Acceptable values for bf option (maximum number of B frames) are 0,1,3,7 or 15\n", avctx->max_b_frames);
+        return AVERROR_INVALIDDATA;
+    }
+
+    cdsc->param.level_idc = avctx->level;
+
+    if (avctx->rc_buffer_size)   // VBV buf size
+        cdsc->param.vbv_bufsize = (int)(avctx->rc_buffer_size / 1000);
+
+    cdsc->param.rc_type = xectx->rc_mode;
+
+    if (xectx->rc_mode == XEVE_RC_CQP)
+        cdsc->param.qp = xectx->qp;
+    else if (xectx->rc_mode == XEVE_RC_ABR) {
+        if (avctx->bit_rate / 1000 > INT_MAX || avctx->rc_max_rate / 1000 > INT_MAX) {
+            av_log(avctx, AV_LOG_ERROR, "Not supported bitrate bit_rate and rc_max_rate > %d000\n", INT_MAX);
+            return AVERROR_INVALIDDATA;
+        }
+        cdsc->param.bitrate = (int)(avctx->bit_rate / 1000);
+    } else if (xectx->rc_mode == XEVE_RC_CRF)
+        cdsc->param.crf = xectx->crf;
+    else {
+        av_log(avctx, AV_LOG_ERROR, "Not supported rate control type: %d\n", xectx->rc_mode);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (avctx->thread_count <= 0) {
+        int cpu_count = av_cpu_count();
+        cdsc->param.threads = (cpu_count < XEVE_MAX_THREADS) ? cpu_count : XEVE_MAX_THREADS;
+    } else if (avctx->thread_count > XEVE_MAX_THREADS)
+        cdsc->param.threads = XEVE_MAX_THREADS;
+    else
+        cdsc->param.threads = avctx->thread_count;
+
+
+    libxeve_color_fmt(avctx->pix_fmt, &xectx->color_format);
+
+    cdsc->param.cs = XEVE_CS_SET(xectx->color_format, cdsc->param.codec_bit_depth, AV_HAVE_BIGENDIAN);
+
+    cdsc->max_bs_buf_size = MAX_BS_BUF;
+
+    ret = xeve_param_ppt(&cdsc->param, xectx->profile_id, xectx->preset_id, xectx->tune_id);
+    if (XEVE_FAILED(ret)) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot set profile(%d), preset(%d), tune(%d)\n", xectx->profile_id, xectx->preset_id, xectx->tune_id);
+        return AVERROR_EXTERNAL;
+    }
+
+    return 0;
+}
+
+/**
+ * Set XEVE_CFG_SET_USE_PIC_SIGNATURE for encoder
+ *
+ * @param[in] logger context
+ * @param[in] id XEVE encodec instance identifier
+ * @param[in] ctx the structure stores all the states associated with the instance of Xeve MPEG-5 EVC encoder
+ *
+ * @return 0 on success, negative error code on failure
+ */
+static int set_extra_config(AVCodecContext *avctx, XEVE id, XeveContext *ctx)
+{
+    int ret, size;
+    size = 4;
+
+    // embed SEI messages identifying encoder parameters and command line arguments
+    // - 0: off\n"
+    // - 1: emit sei info"
+    //
+    // SEI - Supplemental enhancement information contains information
+    // that is not necessary to decode the samples of coded pictures from VCL NAL units.
+    // Some SEI message information is required to check bitstream conformance
+    // and for output timing decoder conformance.
+    // @see ISO_IEC_23094-1_2020 7.4.3.5
+    // @see ISO_IEC_23094-1_2020 Annex D
+    ret = xeve_config(id, XEVE_CFG_SET_SEI_CMD, &ctx->sei_info, &size); // sei_cmd_info
+    if (XEVE_FAILED(ret)) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to set config for sei command info messages\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    ret = xeve_config(id, XEVE_CFG_SET_USE_PIC_SIGNATURE, &ctx->hash, &size);
+    if (XEVE_FAILED(ret)) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to set config for picture signature\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    return 0;
+}
+
+/**
+ * @brief Switch encoder to bumping mode
+ *
+ * @param id XEVE encodec instance identifier
+ * @return 0 on success, negative error code on failure
+ */
+static int setup_bumping(XEVE id)
+{
+    int val = 1;
+    int size = sizeof(int);
+    if (XEVE_FAILED(xeve_config(id, XEVE_CFG_SET_FORCE_OUT, (void *)(&val), &size)))
+        return AVERROR_EXTERNAL;
+
+    return 0;
+}
+
+/**
+ * @brief Initialize eXtra-fast Essential Video Encoder codec
+ * Create an encoder instance and allocate all the needed resources
+ *
+ * @param avctx codec context
+ * @return 0 on success, negative error code on failure
+ */
+static av_cold int libxeve_init(AVCodecContext *avctx)
+{
+    XeveContext *xectx = avctx->priv_data;
+    unsigned char *bs_buf = NULL;
+    int i;
+    int shift_h = 0;
+    int shift_v = 0;
+    int width_chroma = 0;
+    int height_chroma = 0;
+    XEVE_IMGB *imgb = NULL;
+    int ret = 0;
+
+    XEVE_CDSC *cdsc = &(xectx->cdsc);
+
+    /* allocate bitstream buffer */
+    bs_buf = av_malloc(MAX_BS_BUF);
+    if (bs_buf == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot allocate bitstream buffer\n");
+        return AVERROR(ENOMEM);
+    }
+    xectx->bitb.addr = bs_buf;
+    xectx->bitb.bsize = MAX_BS_BUF;
+
+    /* read configurations and set values for created descriptor (XEVE_CDSC) */
+    if ((ret = get_conf(avctx, cdsc)) != 0) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot get configuration\n");
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = xeve_param_check(&cdsc->param)) != 0) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid configuration\n");
+        return AVERROR(EINVAL);
+    }
+
+    {
+        AVDictionaryEntry *en = NULL;
+        while (en = av_dict_get(xectx->xeve_params, "", en, AV_DICT_IGNORE_SUFFIX)) {
+            if ((ret = xeve_param_parse(&cdsc->param, en->key, en->value)) < 0) {
+                av_log(avctx, AV_LOG_WARNING,
+                       "Error parsing option '%s = %s'.\n",
+                       en->key, en->value);
+            }
+        }
+    }
+
+    /* create encoder */
+    xectx->id = xeve_create(cdsc, NULL);
+    if (xectx->id == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot create XEVE encoder\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    if ((ret = set_extra_config(avctx, xectx->id, xectx)) != 0) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot set extra configuration\n");
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &shift_h, &shift_v)) != 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to get  chroma shift\n");
+        return AVERROR(EINVAL);
+    }
+
+    // Chroma subsampling
+    //
+    // YUV format explanation
+    // shift_h == 1 && shift_v == 1 : YUV420
+    // shift_h == 1 && shift_v == 0 : YUV422
+    // shift_h == 0 && shift_v == 0 : YUV444
+    //
+    width_chroma = AV_CEIL_RSHIFT(avctx->width, shift_h);
+    height_chroma = AV_CEIL_RSHIFT(avctx->height, shift_v);
+
+    /* set default values for input image buffer */
+    imgb = &xectx->imgb;
+    imgb->cs = libxeve_color_space(avctx->pix_fmt);
+    imgb->np = 3; /* only for yuv420p, yuv420ple */
+
+    for (i = 0; i < imgb->np; i++)
+        imgb->x[i] = imgb->y[i] = 0;
+
+    imgb->w[0] = imgb->aw[0] = avctx->width; // width luma
+    imgb->w[1] = imgb->w[2] = imgb->aw[1] = imgb->aw[2] = width_chroma;
+    imgb->h[0] = imgb->ah[0] = avctx->height; // height luma
+    imgb->h[1] = imgb->h[2] = imgb->ah[1] = imgb->ah[2] = height_chroma;
+
+    xectx->state = STATE_ENCODING;
+
+    return 0;
+}
+
+/**
+  * Encode raw data frame into EVC packet
+  *
+  * @param[in]  avctx codec context
+  * @param[out] avpkt output AVPacket containing encoded data
+  * @param[in]  frame AVFrame containing the raw data to be encoded
+  * @param[out] got_packet encoder sets to 0 or 1 to indicate that a
+  *                         non-empty packet was returned in pkt
+  *
+  * @return 0 on success, negative error code on failure
+  */
+static int libxeve_encode(AVCodecContext *avctx, AVPacket *avpkt,
+                          const AVFrame *frame, int *got_packet)
+{
+    XeveContext *xectx =  avctx->priv_data;
+    int  ret = -1;
+
+    // No more input frames are available but encoder still can have some data in its internal buffer to process
+    // and some frames to dump.
+    if (xectx->state == STATE_ENCODING && frame == NULL) {
+        if (setup_bumping(xectx->id) == 0)
+            xectx->state = STATE_BUMPING;  // Entering bumping process
+        else {
+            av_log(avctx, AV_LOG_ERROR, "Failed to setup bumping\n");
+            return 0;
+        }
+    }
+
+    if (xectx->state == STATE_ENCODING) {
+        int i;
+        XEVE_IMGB *imgb = NULL;
+
+        imgb = &xectx->imgb;
+
+        for (i = 0; i < imgb->np; i++) {
+            imgb->a[i] = frame->data[i];
+            imgb->s[i] = frame->linesize[i];
+        }
+
+        imgb->ts[XEVE_TS_PTS] = frame->pts;
+
+        /* push image to encoder */
+        ret = xeve_push(xectx->id, imgb);
+        if (XEVE_FAILED(ret)) {
+            av_log(avctx, AV_LOG_ERROR, "xeve_push() failed\n");
+            return AVERROR_EXTERNAL;
+        }
+    }
+    if (xectx->state == STATE_ENCODING || xectx->state == STATE_BUMPING) {
+        /* encoding */
+        ret = xeve_encode(xectx->id, &(xectx->bitb), &(xectx->stat));
+        if (XEVE_FAILED(ret)) {
+            av_log(avctx, AV_LOG_ERROR, "xeve_encode() failed\n");
+            return AVERROR_EXTERNAL;
+        }
+
+        /* store bitstream */
+        if (ret == XEVE_OK_OUT_NOT_AVAILABLE) { // Return OK but picture is not available yet
+            *got_packet = 0;
+            return 0;
+        } else if (ret == XEVE_OK) {
+            int av_pic_type;
+
+            if (xectx->stat.write > 0) {
+
+                ret = ff_get_encode_buffer(avctx, avpkt, xectx->stat.write, 0);
+                if (ret < 0)
+                    return ret;
+
+                memcpy(avpkt->data, xectx->bitb.addr, xectx->stat.write);
+
+                avpkt->time_base.num = 1;
+                avpkt->time_base.den = xectx->cdsc.param.fps;
+
+                avpkt->pts = xectx->bitb.ts[XEVE_TS_PTS];
+                avpkt->dts = xectx->bitb.ts[XEVE_TS_DTS];
+
+                switch(xectx->stat.stype) {
+                case XEVE_ST_I:
+                    av_pic_type = AV_PICTURE_TYPE_I;
+                    avpkt->flags |= AV_PKT_FLAG_KEY;
+                    break;
+                case XEVE_ST_P:
+                    av_pic_type = AV_PICTURE_TYPE_P;
+                    break;
+                case XEVE_ST_B:
+                    av_pic_type = AV_PICTURE_TYPE_B;
+                    break;
+                case XEVE_ST_UNKNOWN:
+                    av_log(avctx, AV_LOG_ERROR, "Unknown slice type\n");
+                    return AVERROR_INVALIDDATA;
+                }
+
+                ff_side_data_set_encoder_stats(avpkt, xectx->stat.qp * FF_QP2LAMBDA, NULL, 0, av_pic_type);
+
+                *got_packet = 1;
+            }
+        } else if (ret == XEVE_OK_NO_MORE_FRM) {
+            // Return OK but no more frames
+            return 0;
+        } else {
+            av_log(avctx, AV_LOG_ERROR, "Invalid return value: %d\n", ret);
+            return AVERROR_EXTERNAL;
+        }
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "Udefined encoder state\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+/**
+ * Destroy the encoder and release all the allocated resources
+ *
+ * @param avctx codec context
+ * @return 0 on success, negative error code on failure
+ */
+static av_cold int libxeve_close(AVCodecContext *avctx)
+{
+    XeveContext *xectx = avctx->priv_data;
+
+    if (xectx->id) {
+        xeve_delete(xectx->id);
+        xectx->id = NULL;
+    }
+
+    av_free(xectx->bitb.addr); /* release bitstream buffer */
+
+    return 0;
+}
+
+#define OFFSET(x) offsetof(XeveContext, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+
+static const enum AVPixelFormat supported_pixel_formats[] = {
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_YUV420P10,
+    AV_PIX_FMT_NONE
+};
+
+// Consider using following options (./ffmpeg --help encoder=libxeve)
+//
+static const AVOption libxeve_options[] = {
+    { "preset", "Encoding preset for setting encoding speed", OFFSET(preset_id), AV_OPT_TYPE_INT, { .i64 = XEVE_PRESET_MEDIUM }, XEVE_PRESET_DEFAULT,  XEVE_PRESET_PLACEBO, VE, "preset" },
+    { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PRESET_DEFAULT }, INT_MIN, INT_MAX, VE, "preset" },
+    { "fast",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PRESET_FAST },    INT_MIN, INT_MAX, VE, "preset" },
+    { "medium",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PRESET_MEDIUM },  INT_MIN, INT_MAX, VE, "preset" },
+    { "slow",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PRESET_SLOW },    INT_MIN, INT_MAX, VE, "preset" },
+    { "placebo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PRESET_PLACEBO }, INT_MIN, INT_MAX, VE, "preset" },
+    { "tune", "Tuning parameter for special purpose operation", OFFSET(tune_id), AV_OPT_TYPE_INT, { .i64 = XEVE_TUNE_NONE }, XEVE_TUNE_NONE, XEVE_TUNE_PSNR, VE, "tune"},
+    { "none",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_TUNE_NONE },        INT_MIN, INT_MAX, VE, "tune" },
+    { "zerolatency", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_TUNE_ZEROLATENCY }, INT_MIN, INT_MAX, VE, "tune" },
+    { "psnr",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_TUNE_PSNR },        INT_MIN, INT_MAX, VE, "tune" },
+    { "profile", "Encoding profile", OFFSET(profile_id), AV_OPT_TYPE_INT, { .i64 = XEVE_PROFILE_BASELINE }, XEVE_PROFILE_BASELINE,  XEVE_PROFILE_MAIN, VE, "profile" },
+    { "baseline", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PROFILE_BASELINE }, INT_MIN, INT_MAX, VE, "profile" },
+    { "main",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_PROFILE_MAIN },     INT_MIN, INT_MAX, VE, "profile" },
+    { "rc_mode", "Rate control mode", OFFSET(rc_mode), AV_OPT_TYPE_INT, { .i64 = XEVE_RC_CQP }, XEVE_RC_CQP,  XEVE_RC_CRF, VE, "rc_mode" },
+    { "CQP", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_RC_CQP }, INT_MIN, INT_MAX, VE, "rc_mode" },
+    { "ABR", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_RC_ABR }, INT_MIN, INT_MAX, VE, "rc_mode" },
+    { "CRF", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = XEVE_RC_CRF }, INT_MIN, INT_MAX, VE, "rc_mode" },
+    { "qp", "Quantization parameter value for CQP rate control mode", OFFSET(qp), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 51, VE },
+    { "crf", "Constant rate factor value for CRF rate control mode", OFFSET(crf), AV_OPT_TYPE_INT, { .i64 = 32 }, 10, 49, VE },
+    { "hash", "Embed picture signature (HASH) for conformance checking in decoding", OFFSET(hash), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
+    { "sei_info", "Embed SEI messages identifying encoder parameters and command line arguments", OFFSET(sei_info), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
+    { "xeve-params",  "Override the xeve configuration using a :-separated list of key=value parameters", OFFSET(xeve_params), AV_OPT_TYPE_DICT, { 0 }, 0, 0, VE },
+    { NULL }
+};
+
+static const AVClass libxeve_class = {
+    .class_name = "libxeve",
+    .item_name  = av_default_item_name,
+    .option     = libxeve_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+/**
+ *  libavcodec generic global options, which can be set on all the encoders and decoders
+ *  @see https://www.ffmpeg.org/ffmpeg-codecs.html#Codec-Options
+ */
+static const FFCodecDefault libxeve_defaults[] = {
+    { "b", "0" },       // bitrate in terms of kilo-bits per second
+    { "g", "0" },       // gop_size (key-frame interval 0: only one I-frame at the first time; 1: every frame is coded in I-frame)
+    { "bf", "15"},      // maximum number of B frames (0: no B-frames, 1,3,7,15)
+    { "threads", "0"},  // number of threads to be used (0: automatically select the number of threads to set)
+    { NULL },
+};
+
+const FFCodec ff_libxeve_encoder = {
+    .p.name             = "libxeve",
+    .p.long_name        = NULL_IF_CONFIG_SMALL("libxeve MPEG-5 EVC"),
+    .p.type             = AVMEDIA_TYPE_VIDEO,
+    .p.id               = AV_CODEC_ID_EVC,
+    .init               = libxeve_init,
+    FF_CODEC_ENCODE_CB(libxeve_encode),
+    .close              = libxeve_close,
+    .priv_data_size     = sizeof(XeveContext),
+    .p.priv_class       = &libxeve_class,
+    .defaults           = libxeve_defaults,
+    .p.capabilities     = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_OTHER_THREADS | AV_CODEC_CAP_DR1,
+    .p.profiles         = NULL_IF_CONFIG_SMALL(ff_evc_profiles),
+    .p.wrapper_name     = "libxeve",
+    .p.pix_fmts         = supported_pixel_formats,
+    .caps_internal      = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_NOT_INIT_THREADSAFE,
+};