nvenc: H264 and HEVC encoders

Partially based on the work of Timo Rothenpieler <timo@rothenpieler.org>

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

1 files changed, 1136 insertions, 0 deletions

diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
new file mode 100644
index 0000000000..e725e3d8e6
--- /dev/null
+++ b/libavcodec/nvenc.c
@@ -0,0 +1,1136 @@
+/*
+ * NVIDIA NVENC Support
+ * Copyright (C) 2015 Luca Barbato
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include <cuda.h>
+#include <nvEncodeAPI.h>
+#include <string.h>
+
+#define CUDA_LIBNAME "libcuda.so"
+
+#if HAVE_DLFCN_H
+#include <dlfcn.h>
+
+#define NVENC_LIBNAME "libnvidia-encode.so"
+
+#elif HAVE_WINDOWS_H
+#include <windows.h>
+
+#if ARCH_X86_64
+#define NVENC_LIBNAME "nvEncodeAPI64.dll"
+#else
+#define NVENC_LIBNAME "nvEncodeAPI.dll"
+#endif
+
+#define dlopen(filename, flags) LoadLibrary((filename))
+#define dlsym(handle, symbol)   GetProcAddress(handle, symbol)
+#define dlclose(handle)         FreeLibrary(handle)
+#endif
+
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "nvenc.h"
+
+#define NVENC_CAP 0x30
+#define BITSTREAM_BUFFER_SIZE 1024 * 1024
+
+#define LOAD_LIBRARY(l, path)                   \
+    do {                                        \
+        if (!((l) = dlopen(path, RTLD_LAZY))) { \
+            av_log(avctx, AV_LOG_ERROR,         \
+                   "Cannot load %s\n",          \
+                   path);                       \
+            return AVERROR_UNKNOWN;             \
+        }                                       \
+    } while (0)
+
+#define LOAD_SYMBOL(fun, lib, symbol)        \
+    do {                                     \
+        if (!((fun) = dlsym(lib, symbol))) { \
+            av_log(avctx, AV_LOG_ERROR,      \
+                   "Cannot load %s\n",       \
+                   symbol);                  \
+            return AVERROR_UNKNOWN;          \
+        }                                    \
+    } while (0)
+
+static av_cold int nvenc_load_libraries(AVCodecContext *avctx)
+{
+    NVENCContext *ctx         = avctx->priv_data;
+    NVENCLibraryContext *nvel = &ctx->nvel;
+    PNVENCODEAPICREATEINSTANCE nvenc_create_instance;
+
+    LOAD_LIBRARY(nvel->cuda, CUDA_LIBNAME);
+
+    LOAD_SYMBOL(nvel->cu_init, nvel->cuda, "cuInit");
+    LOAD_SYMBOL(nvel->cu_device_get_count, nvel->cuda, "cuDeviceGetCount");
+    LOAD_SYMBOL(nvel->cu_device_get, nvel->cuda, "cuDeviceGet");
+    LOAD_SYMBOL(nvel->cu_device_get_name, nvel->cuda, "cuDeviceGetName");
+    LOAD_SYMBOL(nvel->cu_device_compute_capability, nvel->cuda,
+                "cuDeviceComputeCapability");
+    LOAD_SYMBOL(nvel->cu_ctx_create, nvel->cuda, "cuCtxCreate_v2");
+    LOAD_SYMBOL(nvel->cu_ctx_pop_current, nvel->cuda, "cuCtxPopCurrent_v2");
+    LOAD_SYMBOL(nvel->cu_ctx_destroy, nvel->cuda, "cuCtxDestroy_v2");
+
+    LOAD_LIBRARY(nvel->nvenc, NVENC_LIBNAME);
+
+    LOAD_SYMBOL(nvenc_create_instance, nvel->nvenc,
+                "NvEncodeAPICreateInstance");
+
+    nvel->nvenc_funcs.version = NV_ENCODE_API_FUNCTION_LIST_VER;
+
+    if ((nvenc_create_instance(&nvel->nvenc_funcs)) != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot create the NVENC instance");
+        return AVERROR_UNKNOWN;
+    }
+
+    return 0;
+}
+
+static int nvenc_open_session(AVCodecContext *avctx)
+{
+    NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS params = { 0 };
+    NVENCContext *ctx                           = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv             = &ctx->nvel.nvenc_funcs;
+    int ret;
+
+    params.version    = NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER;
+    params.apiVersion = NVENCAPI_VERSION;
+    params.device     = ctx->cu_context;
+    params.deviceType = NV_ENC_DEVICE_TYPE_CUDA;
+
+    ret = nv->nvEncOpenEncodeSessionEx(&params, &ctx->nvenc_ctx);
+    if (ret != NV_ENC_SUCCESS) {
+        ctx->nvenc_ctx = NULL;
+        av_log(avctx, AV_LOG_ERROR,
+               "Cannot open the NVENC Session\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    return 0;
+}
+
+static int nvenc_check_codec_support(AVCodecContext *avctx)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    int i, ret, count = 0;
+    GUID *guids = NULL;
+
+    ret = nv->nvEncGetEncodeGUIDCount(ctx->nvenc_ctx, &count);
+
+    if (ret != NV_ENC_SUCCESS || !count)
+        return AVERROR(ENOSYS);
+
+    guids = av_malloc(count * sizeof(GUID));
+    if (!guids)
+        return AVERROR(ENOMEM);
+
+    ret = nv->nvEncGetEncodeGUIDs(ctx->nvenc_ctx, guids, count, &count);
+    if (ret != NV_ENC_SUCCESS) {
+        ret = AVERROR(ENOSYS);
+        goto fail;
+    }
+
+    ret = AVERROR(ENOSYS);
+    for (i = 0; i < count; i++) {
+        if (!memcmp(&guids[i], &ctx->params.encodeGUID, sizeof(*guids))) {
+            ret = 0;
+            break;
+        }
+    }
+
+fail:
+    av_free(guids);
+
+    return ret;
+}
+
+static int nvenc_check_cap(AVCodecContext *avctx, NV_ENC_CAPS cap)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    NV_ENC_CAPS_PARAM params        = { 0 };
+    int ret, val = 0;
+
+    params.version     = NV_ENC_CAPS_PARAM_VER;
+    params.capsToQuery = cap;
+
+    ret = nv->nvEncGetEncodeCaps(ctx->nvenc_ctx, ctx->params.encodeGUID, &params, &val);
+
+    if (ret == NV_ENC_SUCCESS)
+        return val;
+    return 0;
+}
+
+static int nvenc_check_capabilities(AVCodecContext *avctx)
+{
+    int ret;
+
+    ret = nvenc_check_codec_support(avctx);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_VERBOSE, "Codec not supported\n");
+        return ret;
+    }
+
+    ret = nvenc_check_cap(avctx, NV_ENC_CAPS_SUPPORT_YUV444_ENCODE);
+    if (avctx->pix_fmt == AV_PIX_FMT_YUV444P && ret <= 0) {
+        av_log(avctx, AV_LOG_VERBOSE, "YUV444P not supported\n");
+        return AVERROR(ENOSYS);
+    }
+
+    ret = nvenc_check_cap(avctx, NV_ENC_CAPS_WIDTH_MAX);
+    if (ret < avctx->width) {
+        av_log(avctx, AV_LOG_VERBOSE, "Width %d exceeds %d\n",
+               avctx->width, ret);
+        return AVERROR(ENOSYS);
+    }
+
+    ret = nvenc_check_cap(avctx, NV_ENC_CAPS_HEIGHT_MAX);
+    if (ret < avctx->height) {
+        av_log(avctx, AV_LOG_VERBOSE, "Height %d exceeds %d\n",
+               avctx->height, ret);
+        return AVERROR(ENOSYS);
+    }
+
+    ret = nvenc_check_cap(avctx, NV_ENC_CAPS_NUM_MAX_BFRAMES);
+    if (ret < avctx->max_b_frames) {
+        av_log(avctx, AV_LOG_VERBOSE, "Max b-frames %d exceed %d\n",
+               avctx->max_b_frames, ret);
+
+        return AVERROR(ENOSYS);
+    }
+
+    return 0;
+}
+
+static int nvenc_check_device(AVCodecContext *avctx, int idx)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NVENCLibraryContext *nvel       = &ctx->nvel;
+    char name[128]                  = { 0 };
+    int major, minor, ret;
+    CUdevice cu_device;
+    CUcontext dummy;
+    int loglevel = AV_LOG_VERBOSE;
+
+    if (ctx->device == LIST_DEVICES)
+        loglevel = AV_LOG_INFO;
+
+    ret = nvel->cu_device_get(&cu_device, idx);
+    if (ret != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Cannot access the CUDA device %d\n",
+               idx);
+        return -1;
+    }
+
+    ret = nvel->cu_device_get_name(name, sizeof(name), cu_device);
+    if (ret != CUDA_SUCCESS)
+        return -1;
+
+    ret = nvel->cu_device_compute_capability(&major, &minor, cu_device);
+    if (ret != CUDA_SUCCESS)
+        return -1;
+
+    av_log(avctx, loglevel, "Device %d [%s] ", cu_device, name);
+
+    if (((major << 4) | minor) < NVENC_CAP)
+        goto fail;
+
+    ret = nvel->cu_ctx_create(&ctx->cu_context, 0, cu_device);
+    if (ret != CUDA_SUCCESS)
+        goto fail;
+
+    ret = nvel->cu_ctx_pop_current(&dummy);
+    if (ret != CUDA_SUCCESS)
+        goto fail2;
+
+    if ((ret = nvenc_open_session(avctx)) < 0)
+        goto fail2;
+
+    if ((ret = nvenc_check_capabilities(avctx)) < 0)
+        goto fail3;
+
+    av_log(avctx, loglevel, "supports NVENC\n");
+
+    if (ctx->device == cu_device || ctx->device == ANY_DEVICE)
+        return 0;
+
+fail3:
+    nvel->nvenc_funcs.nvEncDestroyEncoder(ctx->nvenc_ctx);
+    ctx->nvenc_ctx = NULL;
+
+fail2:
+    nvel->cu_ctx_destroy(ctx->cu_context);
+    ctx->cu_context = NULL;
+
+fail:
+    if (ret != 0)
+        av_log(avctx, loglevel, "does not support NVENC (major %d minor %d)\n",
+               major, minor);
+
+    return AVERROR(ENOSYS);
+}
+
+static int nvenc_setup_device(AVCodecContext *avctx)
+{
+    NVENCContext *ctx         = avctx->priv_data;
+    NVENCLibraryContext *nvel = &ctx->nvel;
+    int i, nb_devices = 0;
+
+    if ((nvel->cu_init(0)) != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Cannot init CUDA\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    if ((nvel->cu_device_get_count(&nb_devices)) != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Cannot enumerate the CUDA devices\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    switch (avctx->codec->id) {
+    case AV_CODEC_ID_H264:
+        ctx->params.encodeGUID = NV_ENC_CODEC_H264_GUID;
+        break;
+    case AV_CODEC_ID_HEVC:
+        ctx->params.encodeGUID = NV_ENC_CODEC_HEVC_GUID;
+        break;
+    default:
+        return AVERROR_BUG;
+    }
+
+    for (i = 0; i < nb_devices; ++i) {
+        if ((nvenc_check_device(avctx, i)) >= 0 && ctx->device != LIST_DEVICES)
+            return 0;
+    }
+
+    if (ctx->device == LIST_DEVICES)
+        return AVERROR_EXIT;
+
+    return AVERROR(ENOSYS);
+}
+
+typedef struct GUIDTuple {
+    const GUID guid;
+    int flags;
+} GUIDTuple;
+
+static int nvec_map_preset(NVENCContext *ctx)
+{
+    GUIDTuple presets[] = {
+        { NV_ENC_PRESET_DEFAULT_GUID },
+        { NV_ENC_PRESET_HP_GUID },
+        { NV_ENC_PRESET_HQ_GUID },
+        { NV_ENC_PRESET_BD_GUID },
+        { NV_ENC_PRESET_LOW_LATENCY_DEFAULT_GUID, NVENC_LOWLATENCY },
+        { NV_ENC_PRESET_LOW_LATENCY_HP_GUID,      NVENC_LOWLATENCY },
+        { NV_ENC_PRESET_LOW_LATENCY_HQ_GUID,      NVENC_LOWLATENCY },
+        { NV_ENC_PRESET_LOSSLESS_DEFAULT_GUID,    NVENC_LOSSLESS },
+        { NV_ENC_PRESET_LOSSLESS_HP_GUID,         NVENC_LOSSLESS },
+        { { 0 } }
+    };
+
+    GUIDTuple *t = &presets[ctx->preset];
+
+    ctx->params.presetGUID = t->guid;
+    ctx->flags             = t->flags;
+
+    return AVERROR(EINVAL);
+}
+
+static void set_constqp(AVCodecContext *avctx, NV_ENC_RC_PARAMS *rc)
+{
+    rc->rateControlMode = NV_ENC_PARAMS_RC_CONSTQP;
+    rc->constQP.qpInterB = avctx->global_quality;
+    rc->constQP.qpInterP = avctx->global_quality;
+    rc->constQP.qpIntra  = avctx->global_quality;
+}
+
+static void set_vbr(AVCodecContext *avctx, NV_ENC_RC_PARAMS *rc)
+{
+    if (avctx->qmin >= 0) {
+        rc->enableMinQP    = 1;
+        rc->minQP.qpInterB = avctx->qmin;
+        rc->minQP.qpInterP = avctx->qmin;
+        rc->minQP.qpIntra  = avctx->qmin;
+    }
+
+    if (avctx->qmax >= 0) {
+        rc->enableMaxQP = 1;
+        rc->maxQP.qpInterB = avctx->qmax;
+        rc->maxQP.qpInterP = avctx->qmax;
+        rc->maxQP.qpIntra  = avctx->qmax;
+    }
+}
+
+static void nvenc_override_rate_control(AVCodecContext *avctx,
+                                        NV_ENC_RC_PARAMS *rc)
+{
+    NVENCContext *ctx    = avctx->priv_data;
+
+    switch (ctx->rc) {
+    case NV_ENC_PARAMS_RC_CONSTQP:
+        if (avctx->global_quality < 0) {
+            av_log(avctx, AV_LOG_WARNING,
+                   "The constant quality rate-control requires "
+                   "the 'global_quality' option set.\n");
+            return;
+        }
+        set_constqp(avctx, rc);
+        return;
+    case NV_ENC_PARAMS_RC_2_PASS_VBR:
+    case NV_ENC_PARAMS_RC_VBR:
+        if (avctx->qmin < 0 && avctx->qmax < 0) {
+            av_log(avctx, AV_LOG_WARNING,
+                   "The variable bitrate rate-control requires "
+                   "the 'qmin' and/or 'qmax' option set.\n");
+            return;
+        }
+    case NV_ENC_PARAMS_RC_VBR_MINQP:
+        if (avctx->qmin < 0) {
+            av_log(avctx, AV_LOG_WARNING,
+                   "The variable bitrate rate-control requires "
+                   "the 'qmin' option set.\n");
+            return;
+        }
+        set_vbr(avctx, rc);
+        break;
+    case NV_ENC_PARAMS_RC_CBR:
+        break;
+    case NV_ENC_PARAMS_RC_2_PASS_QUALITY:
+    case NV_ENC_PARAMS_RC_2_PASS_FRAMESIZE_CAP:
+        if (!(ctx->flags & NVENC_LOWLATENCY)) {
+            av_log(avctx, AV_LOG_WARNING,
+                   "The multipass rate-control requires "
+                   "a low-latency preset.\n");
+            return;
+        }
+    }
+
+    rc->rateControlMode = ctx->rc;
+}
+
+static void nvenc_setup_rate_control(AVCodecContext *avctx)
+{
+    NVENCContext *ctx    = avctx->priv_data;
+    NV_ENC_RC_PARAMS *rc = &ctx->config.rcParams;
+
+    if (avctx->bit_rate > 0)
+        rc->averageBitRate = avctx->bit_rate;
+
+    if (avctx->rc_max_rate > 0)
+        rc->maxBitRate = avctx->rc_max_rate;
+
+    if (ctx->rc > 0) {
+        nvenc_override_rate_control(avctx, rc);
+    } else if (avctx->global_quality > 0) {
+        set_constqp(avctx, rc);
+    } else if (avctx->qmin >= 0 && avctx->qmax >= 0) {
+        rc->rateControlMode = NV_ENC_PARAMS_RC_VBR;
+        set_vbr(avctx, rc);
+    }
+
+    if (avctx->rc_buffer_size > 0)
+        rc->vbvBufferSize = avctx->rc_buffer_size;
+
+    if (rc->averageBitRate > 0)
+        avctx->bit_rate = rc->averageBitRate;
+}
+
+static int nvenc_setup_h264_config(AVCodecContext *avctx)
+{
+    NVENCContext *ctx                      = avctx->priv_data;
+    NV_ENC_CONFIG *cc                      = &ctx->config;
+    NV_ENC_CONFIG_H264 *h264               = &cc->encodeCodecConfig.h264Config;
+    NV_ENC_CONFIG_H264_VUI_PARAMETERS *vui = &h264->h264VUIParameters;
+
+    vui->colourDescriptionPresentFlag = 1;
+    vui->videoSignalTypePresentFlag   = 1;
+
+    vui->colourMatrix            = avctx->colorspace;
+    vui->colourPrimaries         = avctx->color_primaries;
+    vui->transferCharacteristics = avctx->color_trc;
+
+    vui->videoFullRangeFlag = avctx->color_range == AVCOL_RANGE_JPEG;
+
+    h264->disableSPSPPS = (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
+    h264->repeatSPSPPS  = (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) ? 0 : 1;
+
+    h264->maxNumRefFrames = avctx->refs;
+    h264->idrPeriod       = cc->gopLength;
+
+    if (ctx->profile)
+        avctx->profile = ctx->profile;
+
+    if (avctx->pix_fmt == AV_PIX_FMT_YUV444P)
+        h264->chromaFormatIDC = 3;
+    else
+        h264->chromaFormatIDC = 1;
+
+    switch (ctx->profile) {
+    case NV_ENC_H264_PROFILE_BASELINE:
+        cc->profileGUID = NV_ENC_H264_PROFILE_BASELINE_GUID;
+        break;
+    case NV_ENC_H264_PROFILE_MAIN:
+        cc->profileGUID = NV_ENC_H264_PROFILE_MAIN_GUID;
+        break;
+    case NV_ENC_H264_PROFILE_HIGH:
+        cc->profileGUID = NV_ENC_H264_PROFILE_HIGH_GUID;
+        break;
+    case NV_ENC_H264_PROFILE_HIGH_444:
+        cc->profileGUID = NV_ENC_H264_PROFILE_HIGH_444_GUID;
+        break;
+    case NV_ENC_H264_PROFILE_CONSTRAINED_HIGH:
+        cc->profileGUID = NV_ENC_H264_PROFILE_CONSTRAINED_HIGH_GUID;
+        break;
+    }
+
+    h264->level = ctx->level;
+
+    return 0;
+}
+
+static int nvenc_setup_hevc_config(AVCodecContext *avctx)
+{
+    NVENCContext *ctx                      = avctx->priv_data;
+    NV_ENC_CONFIG *cc                      = &ctx->config;
+    NV_ENC_CONFIG_HEVC *hevc               = &cc->encodeCodecConfig.hevcConfig;
+
+    hevc->disableSPSPPS = (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
+    hevc->repeatSPSPPS  = (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) ? 0 : 1;
+
+    hevc->maxNumRefFramesInDPB = avctx->refs;
+    hevc->idrPeriod            = cc->gopLength;
+
+    /* No other profile is supported in the current SDK version 5 */
+    cc->profileGUID = NV_ENC_HEVC_PROFILE_MAIN_GUID;
+    avctx->profile  = FF_PROFILE_HEVC_MAIN;
+
+    if (ctx->level) {
+        hevc->level = ctx->level;
+    } else {
+        hevc->level = NV_ENC_LEVEL_AUTOSELECT;
+    }
+
+    if (ctx->tier) {
+        hevc->tier = ctx->tier;
+    }
+
+    return 0;
+}
+static int nvenc_setup_codec_config(AVCodecContext *avctx)
+{
+    switch (avctx->codec->id) {
+    case AV_CODEC_ID_H264:
+        return nvenc_setup_h264_config(avctx);
+    case AV_CODEC_ID_HEVC:
+        return nvenc_setup_hevc_config(avctx);
+    }
+    return 0;
+}
+
+static int nvenc_setup_encoder(AVCodecContext *avctx)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    NV_ENC_PRESET_CONFIG preset_cfg = { 0 };
+    int ret;
+
+    ctx->params.version = NV_ENC_INITIALIZE_PARAMS_VER;
+
+    ctx->params.encodeHeight = avctx->height;
+    ctx->params.encodeWidth  = avctx->width;
+
+    if (avctx->sample_aspect_ratio.num &&
+        avctx->sample_aspect_ratio.den &&
+        (avctx->sample_aspect_ratio.num != 1 ||
+         avctx->sample_aspect_ratio.den != 1)) {
+        av_reduce(&ctx->params.darWidth,
+                  &ctx->params.darHeight,
+                  avctx->width * avctx->sample_aspect_ratio.num,
+                  avctx->height * avctx->sample_aspect_ratio.den,
+                  INT_MAX / 8);
+    } else {
+        ctx->params.darHeight = avctx->height;
+        ctx->params.darWidth  = avctx->width;
+    }
+
+    ctx->params.frameRateNum = avctx->time_base.den;
+    ctx->params.frameRateDen = avctx->time_base.num * avctx->ticks_per_frame;
+
+    ctx->params.enableEncodeAsync = 0;
+    ctx->params.enablePTD         = 1;
+
+    ctx->params.encodeConfig = &ctx->config;
+
+    nvec_map_preset(ctx);
+
+    preset_cfg.version           = NV_ENC_PRESET_CONFIG_VER;
+    preset_cfg.presetCfg.version = NV_ENC_CONFIG_VER;
+
+    ret = nv->nvEncGetEncodePresetConfig(ctx->nvenc_ctx,
+                                         ctx->params.encodeGUID,
+                                         ctx->params.presetGUID,
+                                         &preset_cfg);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Cannot get the preset configuration\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    memcpy(&ctx->config, &preset_cfg.presetCfg, sizeof(ctx->config));
+
+    ctx->config.version = NV_ENC_CONFIG_VER;
+
+    if (avctx->gop_size > 0) {
+        if (avctx->max_b_frames > 0) {
+            ctx->last_dts = -2;
+            /* 0 is intra-only,
+             * 1 is I/P only,
+             * 2 is one B Frame,
+             * 3 two B frames, and so on. */
+            ctx->config.frameIntervalP = avctx->max_b_frames + 1;
+        } else if (avctx->max_b_frames == 0) {
+            ctx->config.frameIntervalP = 1;
+        }
+        ctx->config.gopLength = avctx->gop_size;
+    } else if (avctx->gop_size == 0) {
+        ctx->config.frameIntervalP = 0;
+        ctx->config.gopLength      = 1;
+    }
+
+    if (ctx->config.frameIntervalP > 1)
+        avctx->max_b_frames = ctx->config.frameIntervalP - 1;
+
+    nvenc_setup_rate_control(avctx);
+
+    if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
+        ctx->config.frameFieldMode = NV_ENC_PARAMS_FRAME_FIELD_MODE_FIELD;
+    } else {
+        ctx->config.frameFieldMode = NV_ENC_PARAMS_FRAME_FIELD_MODE_FRAME;
+    }
+
+    if ((ret = nvenc_setup_codec_config(avctx)) < 0)
+        return ret;
+
+    ret = nv->nvEncInitializeEncoder(ctx->nvenc_ctx, &ctx->params);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot initialize the decoder");
+        return AVERROR_UNKNOWN;
+    }
+
+    return 0;
+}
+
+static int nvenc_alloc_surface(AVCodecContext *avctx, int idx)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    int ret;
+    NV_ENC_CREATE_INPUT_BUFFER in_buffer      = { 0 };
+    NV_ENC_CREATE_BITSTREAM_BUFFER out_buffer = { 0 };
+
+    in_buffer.version  = NV_ENC_CREATE_INPUT_BUFFER_VER;
+    out_buffer.version = NV_ENC_CREATE_BITSTREAM_BUFFER_VER;
+
+    in_buffer.width  = avctx->width;
+    in_buffer.height = avctx->height;
+
+    in_buffer.memoryHeap = NV_ENC_MEMORY_HEAP_SYSMEM_UNCACHED;
+
+    switch (avctx->pix_fmt) {
+    case AV_PIX_FMT_YUV420P:
+        in_buffer.bufferFmt = NV_ENC_BUFFER_FORMAT_YV12_PL;
+        break;
+    case AV_PIX_FMT_NV12:
+        in_buffer.bufferFmt = NV_ENC_BUFFER_FORMAT_NV12_PL;
+        break;
+    case AV_PIX_FMT_YUV444P:
+        in_buffer.bufferFmt = NV_ENC_BUFFER_FORMAT_YUV444_PL;
+        break;
+    default:
+        return AVERROR_BUG;
+    }
+
+    ret = nv->nvEncCreateInputBuffer(ctx->nvenc_ctx, &in_buffer);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "CreateInputBuffer failed\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    ctx->in[idx].in        = in_buffer.inputBuffer;
+    ctx->in[idx].format    = in_buffer.bufferFmt;
+
+    /* 1MB is large enough to hold most output frames.
+     * NVENC increases this automaticaly if it's not enough. */
+    out_buffer.size = BITSTREAM_BUFFER_SIZE;
+
+    out_buffer.memoryHeap = NV_ENC_MEMORY_HEAP_SYSMEM_UNCACHED;
+
+    ret = nv->nvEncCreateBitstreamBuffer(ctx->nvenc_ctx, &out_buffer);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "CreateBitstreamBuffer failed\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    ctx->out[idx].out  = out_buffer.bitstreamBuffer;
+    ctx->out[idx].busy = 0;
+
+    return 0;
+}
+
+static int nvenc_setup_surfaces(AVCodecContext *avctx)
+{
+    NVENCContext *ctx = avctx->priv_data;
+    int i, ret;
+
+    ctx->nb_surfaces = FFMAX(4 + avctx->max_b_frames,
+                             ctx->nb_surfaces);
+
+    ctx->in = av_mallocz(ctx->nb_surfaces * sizeof(*ctx->in));
+    if (!ctx->in)
+        return AVERROR(ENOMEM);
+
+    ctx->out = av_mallocz(ctx->nb_surfaces * sizeof(*ctx->out));
+    if (!ctx->out)
+        return AVERROR(ENOMEM);
+
+    ctx->timestamps = av_fifo_alloc(ctx->nb_surfaces * sizeof(int64_t));
+    if (!ctx->timestamps)
+        return AVERROR(ENOMEM);
+    ctx->pending = av_fifo_alloc(ctx->nb_surfaces * sizeof(ctx->out));
+    if (!ctx->pending)
+        return AVERROR(ENOMEM);
+    ctx->ready = av_fifo_alloc(ctx->nb_surfaces * sizeof(ctx->out));
+    if (!ctx->ready)
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < ctx->nb_surfaces; i++) {
+        if ((ret = nvenc_alloc_surface(avctx, i)) < 0)
+            return ret;
+    }
+
+    return 0;
+}
+
+#define EXTRADATA_SIZE 512
+
+static int nvenc_setup_extradata(AVCodecContext *avctx)
+{
+    NVENCContext *ctx                     = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv       = &ctx->nvel.nvenc_funcs;
+    NV_ENC_SEQUENCE_PARAM_PAYLOAD payload = { 0 };
+    int ret;
+
+    avctx->extradata = av_mallocz(EXTRADATA_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+
+    payload.version              = NV_ENC_SEQUENCE_PARAM_PAYLOAD_VER;
+    payload.spsppsBuffer         = avctx->extradata;
+    payload.inBufferSize         = EXTRADATA_SIZE;
+    payload.outSPSPPSPayloadSize = &avctx->extradata_size;
+
+    ret = nv->nvEncGetSequenceParams(ctx->nvenc_ctx, &payload);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot get the extradata\n");
+        return AVERROR_UNKNOWN;
+    }
+
+    return 0;
+}
+
+av_cold int ff_nvenc_encode_close(AVCodecContext *avctx)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    int i;
+
+    av_frame_free(&avctx->coded_frame);
+
+    if (ctx->in) {
+        for (i = 0; i < ctx->nb_surfaces; ++i) {
+            nv->nvEncDestroyInputBuffer(ctx->nvenc_ctx, ctx->in[i].in);
+            nv->nvEncDestroyBitstreamBuffer(ctx->nvenc_ctx, ctx->out[i].out);
+        }
+    }
+
+    av_freep(&ctx->in);
+    av_freep(&ctx->out);
+
+    if (ctx->nvenc_ctx)
+        nv->nvEncDestroyEncoder(ctx->nvenc_ctx);
+
+    if (ctx->cu_context)
+        ctx->nvel.cu_ctx_destroy(ctx->cu_context);
+
+    if (ctx->nvel.nvenc)
+        dlclose(ctx->nvel.nvenc);
+
+    if (ctx->nvel.cuda)
+        dlclose(ctx->nvel.cuda);
+
+    return 0;
+}
+
+av_cold int ff_nvenc_encode_init(AVCodecContext *avctx)
+{
+    int ret;
+
+    if ((ret = nvenc_load_libraries(avctx)) < 0)
+        return ret;
+
+    if ((ret = nvenc_setup_device(avctx)) < 0)
+        return ret;
+
+    if ((ret = nvenc_setup_encoder(avctx)) < 0)
+        return ret;
+
+    if ((ret = nvenc_setup_surfaces(avctx)) < 0)
+        return ret;
+
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
+        if ((ret = nvenc_setup_extradata(avctx)) < 0)
+            return ret;
+    }
+
+    avctx->coded_frame = av_frame_alloc();
+    if (!avctx->coded_frame)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static NVENCInputSurface *get_input_surface(NVENCContext *ctx)
+{
+    int i;
+
+    for (i = 0; i < ctx->nb_surfaces; i++) {
+        if (!ctx->in[i].locked) {
+            ctx->in[i].locked = 1;
+            return &ctx->in[i];
+        }
+    }
+
+    return NULL;
+}
+
+static NVENCOutputSurface *get_output_surface(NVENCContext *ctx)
+{
+    int i;
+
+    for (i = 0; i < ctx->nb_surfaces; i++) {
+        if (!ctx->out[i].busy) {
+            return &ctx->out[i];
+        }
+    }
+
+    return NULL;
+}
+
+static int nvenc_copy_frame(NV_ENC_LOCK_INPUT_BUFFER *in, const AVFrame *frame)
+{
+    uint8_t *buf = in->bufferDataPtr;
+    int off      = frame->height * in->pitch;
+
+    switch (frame->format) {
+    case AV_PIX_FMT_YUV420P:
+        av_image_copy_plane(buf, in->pitch,
+                            frame->data[0], frame->linesize[0],
+                            frame->width, frame->height);
+        buf += off;
+
+        av_image_copy_plane(buf, in->pitch >> 1,
+                            frame->data[2], frame->linesize[2],
+                            frame->width >> 1, frame->height >> 1);
+
+        buf += off >> 2;
+
+        av_image_copy_plane(buf, in->pitch >> 1,
+                            frame->data[1], frame->linesize[1],
+                            frame->width >> 1, frame->height >> 1);
+        break;
+    case AV_PIX_FMT_NV12:
+        av_image_copy_plane(buf, in->pitch,
+                            frame->data[0], frame->linesize[0],
+                            frame->width, frame->height);
+        buf += off;
+
+        av_image_copy_plane(buf, in->pitch >> 1,
+                            frame->data[1], frame->linesize[1],
+                            frame->width >> 1, frame->height >> 1);
+        break;
+    case AV_PIX_FMT_YUV444P:
+        av_image_copy_plane(buf, in->pitch,
+                            frame->data[0], frame->linesize[0],
+                            frame->width, frame->height);
+        buf += off;
+
+        av_image_copy_plane(buf, in->pitch,
+                            frame->data[1], frame->linesize[1],
+                            frame->width, frame->height);
+        buf += off;
+
+        av_image_copy_plane(buf, in->pitch,
+                            frame->data[2], frame->linesize[2],
+                            frame->width, frame->height);
+        break;
+    default:
+        return AVERROR_BUG;
+    }
+
+    return 0;
+}
+
+static int nvenc_enqueue_frame(AVCodecContext *avctx, const AVFrame *frame,
+                               NVENCInputSurface **in_surf)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    NV_ENC_LOCK_INPUT_BUFFER params = { 0 };
+    NVENCInputSurface *in           = get_input_surface(ctx);
+    int ret;
+
+    if (!in)
+        return AVERROR_BUG;
+
+    params.version     = NV_ENC_LOCK_INPUT_BUFFER_VER;
+    params.inputBuffer = in->in;
+
+
+    ret = nv->nvEncLockInputBuffer(ctx->nvenc_ctx, &params);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot lock the buffer %p.\n",
+               in);
+        return AVERROR_UNKNOWN;
+    }
+
+    ret = nvenc_copy_frame(&params, frame);
+    if (ret < 0)
+        goto fail;
+
+    ret = nv->nvEncUnlockInputBuffer(ctx->nvenc_ctx, in->in);
+    if (ret != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot unlock the buffer %p.\n",
+               in);
+        return AVERROR_UNKNOWN;
+    }
+
+    *in_surf = in;
+
+    return 0;
+
+fail:
+    nv->nvEncUnlockInputBuffer(ctx->nvenc_ctx, in->in);
+
+    return ret;
+}
+
+static void nvenc_codec_specific_pic_params(AVCodecContext *avctx,
+                                            NV_ENC_PIC_PARAMS *params)
+{
+    NVENCContext *ctx = avctx->priv_data;
+
+    switch (avctx->codec->id) {
+    case AV_CODEC_ID_H264:
+        params->codecPicParams.h264PicParams.sliceMode =
+            ctx->config.encodeCodecConfig.h264Config.sliceMode;
+        params->codecPicParams.h264PicParams.sliceModeData =
+            ctx->config.encodeCodecConfig.h264Config.sliceModeData;
+        break;
+    case AV_CODEC_ID_HEVC:
+        params->codecPicParams.hevcPicParams.sliceMode =
+            ctx->config.encodeCodecConfig.hevcConfig.sliceMode;
+        params->codecPicParams.hevcPicParams.sliceModeData =
+            ctx->config.encodeCodecConfig.hevcConfig.sliceModeData;
+        break;
+    }
+}
+
+static inline int nvenc_enqueue_timestamp(AVFifoBuffer *f, int64_t pts)
+{
+    return av_fifo_generic_write(f, &pts, sizeof(pts), NULL);
+}
+
+static inline int nvenc_dequeue_timestamp(AVFifoBuffer *f, int64_t *pts)
+{
+    return av_fifo_generic_read(f, pts, sizeof(*pts), NULL);
+}
+
+static inline int nvenc_enqueue_surface(AVFifoBuffer *f,
+                                        NVENCOutputSurface *surf)
+{
+    surf->busy = 1;
+    return av_fifo_generic_write(f, &surf, sizeof(surf), NULL);
+}
+
+static inline int nvenc_dequeue_surface(AVFifoBuffer *f,
+                                        NVENCOutputSurface **surf)
+{
+    return av_fifo_generic_read(f, surf, sizeof(*surf), NULL);
+}
+
+static int nvenc_set_timestamp(NVENCContext *ctx,
+                               NV_ENC_LOCK_BITSTREAM *params,
+                               AVPacket *pkt)
+{
+    pkt->pts      = params->outputTimeStamp;
+    pkt->duration = params->outputDuration;
+
+    return nvenc_dequeue_timestamp(ctx->timestamps, &pkt->dts);
+}
+
+static int nvenc_get_frame(AVCodecContext *avctx, AVPacket *pkt)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    NV_ENC_LOCK_BITSTREAM params    = { 0 };
+    NVENCOutputSurface *out         = NULL;
+    int ret;
+
+    ret = nvenc_dequeue_surface(ctx->pending, &out);
+    if (ret)
+        return ret;
+
+    params.version         = NV_ENC_LOCK_BITSTREAM_VER;
+    params.outputBitstream = out->out;
+
+    ret = nv->nvEncLockBitstream(ctx->nvenc_ctx, &params);
+    if (ret < 0)
+        return AVERROR_UNKNOWN;
+
+    ret = ff_alloc_packet(pkt, params.bitstreamSizeInBytes);
+    if (ret < 0)
+        return ret;
+
+    memcpy(pkt->data, params.bitstreamBufferPtr, pkt->size);
+
+    ret = nv->nvEncUnlockBitstream(ctx->nvenc_ctx, out->out);
+    if (ret < 0)
+        return AVERROR_UNKNOWN;
+
+    out->busy = out->in->locked = 0;
+
+    ret = nvenc_set_timestamp(ctx, &params, pkt);
+    if (ret < 0)
+        return ret;
+
+    switch (params.pictureType) {
+    case NV_ENC_PIC_TYPE_IDR:
+        pkt->flags |= AV_PKT_FLAG_KEY;
+    case NV_ENC_PIC_TYPE_INTRA_REFRESH:
+    case NV_ENC_PIC_TYPE_I:
+        avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
+        break;
+    case NV_ENC_PIC_TYPE_P:
+        avctx->coded_frame->pict_type = AV_PICTURE_TYPE_P;
+        break;
+    case NV_ENC_PIC_TYPE_B:
+        avctx->coded_frame->pict_type = AV_PICTURE_TYPE_B;
+        break;
+    case NV_ENC_PIC_TYPE_BI:
+        avctx->coded_frame->pict_type = AV_PICTURE_TYPE_BI;
+        break;
+    }
+
+    return 0;
+}
+
+int ff_nvenc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                          const AVFrame *frame, int *got_packet)
+{
+    NVENCContext *ctx               = avctx->priv_data;
+    NV_ENCODE_API_FUNCTION_LIST *nv = &ctx->nvel.nvenc_funcs;
+    NV_ENC_PIC_PARAMS params        = { 0 };
+    NVENCInputSurface *in           = NULL;
+    NVENCOutputSurface *out         = NULL;
+    int ret;
+
+    params.version = NV_ENC_PIC_PARAMS_VER;
+
+    if (frame) {
+        ret = nvenc_enqueue_frame(avctx, frame, &in);
+        if (ret < 0)
+            return ret;
+        out = get_output_surface(ctx);
+        if (!out)
+            return AVERROR_BUG;
+
+        out->in = in;
+
+        params.inputBuffer     = in->in;
+        params.bufferFmt       = in->format;
+        params.inputWidth      = frame->width;
+        params.inputHeight     = frame->height;
+        params.outputBitstream = out->out;
+        params.inputTimeStamp  = frame->pts;
+
+        if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
+            if (frame->top_field_first)
+                params.pictureStruct = NV_ENC_PIC_STRUCT_FIELD_TOP_BOTTOM;
+            else
+                params.pictureStruct = NV_ENC_PIC_STRUCT_FIELD_BOTTOM_TOP;
+        } else {
+            params.pictureStruct = NV_ENC_PIC_STRUCT_FRAME;
+        }
+
+        nvenc_codec_specific_pic_params(avctx, &params);
+
+        ret = nvenc_enqueue_timestamp(ctx->timestamps, frame->pts);
+        if (ret < 0)
+            return ret;
+    } else {
+        params.encodePicFlags = NV_ENC_PIC_FLAG_EOS;
+    }
+
+    ret = nv->nvEncEncodePicture(ctx->nvenc_ctx, &params);
+
+    if (ret != NV_ENC_SUCCESS &&
+        ret != NV_ENC_ERR_NEED_MORE_INPUT) {
+
+        return AVERROR_UNKNOWN;
+    }
+
+    if (out) {
+        ret = nvenc_enqueue_surface(ctx->pending, out);
+        if (ret < 0)
+            return ret;
+    }
+
+    if (ret != NV_ENC_ERR_NEED_MORE_INPUT &&
+        av_fifo_size(ctx->pending)) {
+        ret = nvenc_get_frame(avctx, pkt);
+        if (ret < 0)
+            return ret;
+        *got_packet = 1;
+    } else {
+        *got_packet = 0;
+    }
+
+    return 0;
+}