avcodec: Add NVENC encoder

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Changelog

@@ -2,6 +2,7 @@ Entries are sorted chronologically from oldest to youngest within each release,
 releases are sorted from youngest to oldest.
 
 version <next>:
+- nvenc encoder
 
 
 version 2.5:

MAINTAINERS

@@ -226,6 +226,7 @@ Codecs:
   msvideo1.c                            Mike Melanson
   nellymoserdec.c                       Benjamin Larsson
   nuv.c                                 Reimar Doeffinger
+  nvenc.c                               Timo Rothenpieler
   paf.*                                 Paul B Mahol
   pcx.c                                 Ivo van Poorten
   pgssubdec.c                           Reimar Doeffinger

configure

@@ -263,6 +263,7 @@ External library support:
   --enable-libzvbi         enable teletext support via libzvbi [no]
   --disable-lzma           disable lzma [autodetect]
   --enable-decklink        enable Blackmagick DeckLink I/O support [no]
+  --enable-nvenc           enable NVIDIA NVENC support [no]
   --enable-openal          enable OpenAL 1.1 capture support [no]
   --enable-opencl          enable OpenCL code
   --enable-opengl          enable OpenGL rendering [no]
@@ -1400,6 +1401,7 @@ EXTERNAL_LIBRARY_LIST="
     libzmq
     libzvbi
     lzma
+    nvenc
     openal
     opencl
     opengl
@@ -2399,6 +2401,7 @@ libxvid_encoder_deps="libxvid"
 libutvideo_decoder_deps="libutvideo"
 libutvideo_encoder_deps="libutvideo"
 libzvbi_teletext_decoder_deps="libzvbi"
+nvenc_encoder_deps="nvenc"
 
 # demuxers / muxers
 ac3_demuxer_select="ac3_parser"
@@ -4357,6 +4360,7 @@ die_license_disabled gpl x11grab
 
 die_license_disabled nonfree libaacplus
 die_license_disabled nonfree libfaac
+die_license_disabled nonfree nvenc
 enabled gpl && die_license_disabled_gpl nonfree libfdk_aac
 enabled gpl && die_license_disabled_gpl nonfree openssl
 
@@ -4666,6 +4670,7 @@ fi
 frei0r_filter_extralibs='$ldl'
 frei0r_src_filter_extralibs='$ldl'
 ladspa_filter_extralibs='$ldl'
+nvenc_encoder_extralibs='$ldl'
 
 if ! disabled network; then
     check_func getaddrinfo $network_extralibs
@@ -4929,6 +4934,7 @@ enabled libxavs           && require libxavs xavs.h xavs_encoder_encode -lxavs
 enabled libxvid           && require libxvid xvid.h xvid_global -lxvidcore
 enabled libzmq            && require_pkg_config libzmq zmq.h zmq_ctx_new
 enabled libzvbi           && require libzvbi libzvbi.h vbi_decoder_new -lzvbi
+enabled nvenc             && { check_header nvEncodeAPI.h || die "ERROR: nvEncodeAPI.h not found."; }
 enabled openal            && { { for al_libs in "${OPENAL_LIBS}" "-lopenal" "-lOpenAL32"; do
                                check_lib 'AL/al.h' alGetError "${al_libs}" && break; done } ||
                                die "ERROR: openal not found"; } &&

libavcodec/Makefile

@@ -347,6 +347,7 @@ OBJS-$(CONFIG_MXPEG_DECODER)           += mxpegdec.o
 OBJS-$(CONFIG_NELLYMOSER_DECODER)      += nellymoserdec.o nellymoser.o
 OBJS-$(CONFIG_NELLYMOSER_ENCODER)      += nellymoserenc.o nellymoser.o
 OBJS-$(CONFIG_NUV_DECODER)             += nuv.o rtjpeg.o
+OBJS-$(CONFIG_NVENC_ENCODER)           += nvenc.o
 OBJS-$(CONFIG_ON2AVC_DECODER)          += on2avc.o on2avcdata.o
 OBJS-$(CONFIG_OPUS_DECODER)            += opusdec.o opus.o opus_celt.o \
                                           opus_imdct.o opus_silk.o     \

libavcodec/allcodecs.c

@@ -223,6 +223,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(MVC2,              mvc2);
     REGISTER_DECODER(MXPEG,             mxpeg);
     REGISTER_DECODER(NUV,               nuv);
+    REGISTER_ENCODER(NVENC,             nvenc);
     REGISTER_DECODER(PAF_VIDEO,         paf_video);
     REGISTER_ENCDEC (PAM,               pam);
     REGISTER_ENCDEC (PBM,               pbm);

libavcodec/nvenc.c

+/*
+ * H.264 hardware encoding using nvidia nvenc
+ * Copyright (c) 2014 Timo Rothenpieler <timo@rothenpieler.org>
+ *
+ * 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
+ */
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#include <windows.h>
+#else
+#include <dlfcn.h>
+#endif
+
+/* NVENC API is stdcall in cygwin, as it's still Windows */
+#if defined(__CYGWIN__) && !defined(_WIN32)
+#define _WIN32
+#define TEMP_WIN32
+#endif
+
+#include <nvEncodeAPI.h>
+
+#if defined(TEMP_WIN32)
+#undef _WIN32
+#endif
+
+
+#include "libavutil/internal.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "libavutil/mem.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "thread.h"
+
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define CUDAAPI __stdcall
+#else
+#define CUDAAPI
+#endif
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#define LOAD_FUNC(l, s) GetProcAddress(l, s)
+#define DL_CLOSE_FUNC(l) FreeLibrary(l)
+#else
+#define LOAD_FUNC(l, s) dlsym(l, s)
+#define DL_CLOSE_FUNC(l) dlclose(l)
+#endif
+
+typedef enum cudaError_enum {
+    CUDA_SUCCESS = 0
+} CUresult;
+typedef int CUdevice;
+typedef void* CUcontext;
+
+typedef CUresult(CUDAAPI *PCUINIT)(unsigned int Flags);
+typedef CUresult(CUDAAPI *PCUDEVICEGETCOUNT)(int *count);
+typedef CUresult(CUDAAPI *PCUDEVICEGET)(CUdevice *device, int ordinal);
+typedef CUresult(CUDAAPI *PCUDEVICEGETNAME)(char *name, int len, CUdevice dev);
+typedef CUresult(CUDAAPI *PCUDEVICECOMPUTECAPABILITY)(int *major, int *minor, CUdevice dev);
+typedef CUresult(CUDAAPI *PCUCTXCREATE)(CUcontext *pctx, unsigned int flags, CUdevice dev);
+typedef CUresult(CUDAAPI *PCUCTXPOPCURRENT)(CUcontext *pctx);
+typedef CUresult(CUDAAPI *PCUCTXDESTROY)(CUcontext ctx);
+
+typedef NVENCSTATUS (NVENCAPI* PNVENCODEAPICREATEINSTANCE)(NV_ENCODE_API_FUNCTION_LIST *functionList);
+
+static const GUID dummy_license = { 0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } };
+
+typedef struct NvencInputSurface
+{
+    NV_ENC_INPUT_PTR input_surface;
+    int width;
+    int height;
+
+    int lockCount;
+
+    NV_ENC_BUFFER_FORMAT format;
+} NvencInputSurface;
+
+typedef struct NvencOutputSurface
+{
+    NV_ENC_OUTPUT_PTR output_surface;
+    int size;
+
+    NvencInputSurface* input_surface;
+
+    int busy;
+} NvencOutputSurface;
+
+typedef struct NvencData
+{
+    union {
+        int64_t timestamp;
+        NvencOutputSurface *surface;
+    };
+} NvencData;
+
+typedef struct NvencDataList
+{
+    NvencData* data;
+
+    uint32_t pos;
+    uint32_t count;
+    uint32_t size;
+} NvencDataList;
+
+typedef struct NvencDynLoadFunctions
+{
+    PCUINIT cu_init;
+    PCUDEVICEGETCOUNT cu_device_get_count;
+    PCUDEVICEGET cu_device_get;
+    PCUDEVICEGETNAME cu_device_get_name;
+    PCUDEVICECOMPUTECAPABILITY cu_device_compute_capability;
+    PCUCTXCREATE cu_ctx_create;
+    PCUCTXPOPCURRENT cu_ctx_pop_current;
+    PCUCTXDESTROY cu_ctx_destroy;
+
+    NV_ENCODE_API_FUNCTION_LIST nvenc_funcs;
+    int nvenc_device_count;
+    CUdevice nvenc_devices[16];
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+    HMODULE cuda_lib;
+    HMODULE nvenc_lib;
+#else
+    void* cuda_lib;
+    void* nvenc_lib;
+#endif
+} NvencDynLoadFunctions;
+
+typedef struct NvencContext
+{
+    AVClass *avclass;
+
+    NvencDynLoadFunctions nvenc_dload_funcs;
+
+    NV_ENC_INITIALIZE_PARAMS init_encode_params;
+    NV_ENC_CONFIG encode_config;
+    CUcontext cu_context;
+
+    int max_surface_count;
+    NvencInputSurface *input_surfaces;
+    NvencOutputSurface *output_surfaces;
+
+    NvencDataList output_surface_queue;
+    NvencDataList output_surface_ready_queue;
+    NvencDataList timestamp_list;
+    int64_t last_dts;
+
+    void *nvencoder;
+
+    char *preset;
+    int cbr;
+    int twopass;
+    int gobpattern;
+    int gpu;
+} NvencContext;
+
+static NvencData* data_queue_dequeue(NvencDataList* queue)
+{
+    uint32_t mask;
+    uint32_t read_pos;
+
+    av_assert0(queue);
+    av_assert0(queue->size);
+    av_assert0(queue->data);
+
+    if (!queue->count)
+        return NULL;
+
+    /* Size always is a multiple of two */
+    mask = queue->size - 1;
+    read_pos = (queue->pos - queue->count) & mask;
+    queue->count--;
+
+    return &queue->data[read_pos];
+}
+
+static int data_queue_enqueue(NvencDataList* queue, NvencData *data)
+{
+    NvencDataList new_queue;
+    NvencData* tmp_data;
+    uint32_t mask;
+
+    if (!queue->size) {
+        /* size always has to be a multiple of two */
+        queue->size = 4;
+        queue->pos = 0;
+        queue->count = 0;
+
+        queue->data = av_malloc(queue->size * sizeof(*(queue->data)));
+
+        if (!queue->data) {
+            queue->size = 0;
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    if (queue->count == queue->size) {
+        new_queue.size = queue->size << 1;
+        new_queue.pos = 0;
+        new_queue.count = 0;
+        new_queue.data = av_malloc(new_queue.size * sizeof(*(queue->data)));
+
+        if (!new_queue.data)
+            return AVERROR(ENOMEM);
+
+        while (tmp_data = data_queue_dequeue(queue))
+            data_queue_enqueue(&new_queue, tmp_data);
+
+        av_free(queue->data);
+        *queue = new_queue;
+    }
+
+    mask = queue->size - 1;
+
+    queue->data[queue->pos] = *data;
+    queue->pos = (queue->pos + 1) & mask;
+    queue->count++;
+
+    return 0;
+}
+
+static int out_surf_queue_enqueue(NvencDataList* queue, NvencOutputSurface* surface)
+{
+    NvencData data;
+    data.surface = surface;
+
+    return data_queue_enqueue(queue, &data);
+}
+
+static NvencOutputSurface* out_surf_queue_dequeue(NvencDataList* queue)
+{
+    NvencData* res = data_queue_dequeue(queue);
+
+    if (!res)
+        return NULL;
+
+    return res->surface;
+}
+
+static int timestamp_queue_enqueue(NvencDataList* queue, int64_t timestamp)
+{
+    NvencData data;
+    data.timestamp = timestamp;
+
+    return data_queue_enqueue(queue, &data);
+}
+
+static int64_t timestamp_queue_dequeue(NvencDataList* queue)
+{
+    NvencData* res = data_queue_dequeue(queue);
+
+    if (!res)
+        return AV_NOPTS_VALUE;
+
+    return res->timestamp;
+}
+
+#define CHECK_LOAD_FUNC(t, f, s) \
+do { \
+    (f) = (t)LOAD_FUNC(dl_fn->cuda_lib, s); \
+    if (!(f)) { \
+        av_log(avctx, AV_LOG_FATAL, "Failed loading %s from CUDA library\n", s); \
+        goto error; \
+    } \
+} while (0)
+
+static av_cold int nvenc_dyload_cuda(AVCodecContext *avctx)
+{
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+
+    if (dl_fn->cuda_lib)
+        return 1;
+
+#if defined(_WIN32)
+    dl_fn->cuda_lib = LoadLibrary(TEXT("nvcuda.dll"));
+#elif defined(__CYGWIN__)
+    dl_fn->cuda_lib = dlopen("nvcuda.dll", RTLD_LAZY);
+#else
+    dl_fn->cuda_lib = dlopen("libcuda.so", RTLD_LAZY);
+#endif
+
+    if (!dl_fn->cuda_lib) {
+        av_log(avctx, AV_LOG_FATAL, "Failed loading CUDA library\n");
+        goto error;
+    }
+
+    CHECK_LOAD_FUNC(PCUINIT, dl_fn->cu_init, "cuInit");
+    CHECK_LOAD_FUNC(PCUDEVICEGETCOUNT, dl_fn->cu_device_get_count, "cuDeviceGetCount");
+    CHECK_LOAD_FUNC(PCUDEVICEGET, dl_fn->cu_device_get, "cuDeviceGet");
+    CHECK_LOAD_FUNC(PCUDEVICEGETNAME, dl_fn->cu_device_get_name, "cuDeviceGetName");
+    CHECK_LOAD_FUNC(PCUDEVICECOMPUTECAPABILITY, dl_fn->cu_device_compute_capability, "cuDeviceComputeCapability");
+    CHECK_LOAD_FUNC(PCUCTXCREATE, dl_fn->cu_ctx_create, "cuCtxCreate_v2");
+    CHECK_LOAD_FUNC(PCUCTXPOPCURRENT, dl_fn->cu_ctx_pop_current, "cuCtxPopCurrent_v2");
+    CHECK_LOAD_FUNC(PCUCTXDESTROY, dl_fn->cu_ctx_destroy, "cuCtxDestroy_v2");
+
+    return 1;
+
+error:
+
+    if (dl_fn->cuda_lib)
+        DL_CLOSE_FUNC(dl_fn->cuda_lib);
+
+    dl_fn->cuda_lib = NULL;
+
+    return 0;
+}
+
+static av_cold int check_cuda_errors(AVCodecContext *avctx, CUresult err, const char *func)
+{
+    if (err != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, ">> %s - failed with error code 0x%x\n", func, err);
+        return 0;
+    }
+    return 1;
+}
+#define check_cuda_errors(f) if (!check_cuda_errors(avctx, f, #f)) goto error
+
+static av_cold int nvenc_check_cuda(AVCodecContext *avctx)
+{
+    int device_count = 0;
+    CUdevice cu_device = 0;
+    char gpu_name[128];
+    int smminor = 0, smmajor = 0;
+    int i, smver;
+
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+
+    if (!nvenc_dyload_cuda(avctx))
+        return 0;
+
+    if (dl_fn->nvenc_device_count > 0)
+        return 1;
+
+    check_cuda_errors(dl_fn->cu_init(0));
+
+    check_cuda_errors(dl_fn->cu_device_get_count(&device_count));
+
+    if (!device_count) {
+        av_log(avctx, AV_LOG_FATAL, "No CUDA capable devices found\n");
+        goto error;
+    }
+
+    av_log(avctx, AV_LOG_VERBOSE, "%d CUDA capable devices found\n", device_count);
+
+    dl_fn->nvenc_device_count = 0;
+
+    for (i = 0; i < device_count; ++i) {
+        check_cuda_errors(dl_fn->cu_device_get(&cu_device, i));
+        check_cuda_errors(dl_fn->cu_device_get_name(gpu_name, sizeof(gpu_name), cu_device));
+        check_cuda_errors(dl_fn->cu_device_compute_capability(&smmajor, &smminor, cu_device));
+
+        smver = (smmajor << 4) | smminor;
+
+        av_log(avctx, AV_LOG_VERBOSE, "[ GPU #%d - < %s > has Compute SM %d.%d, NVENC %s ]\n", i, gpu_name, smmajor, smminor, (smver >= 0x30) ? "Available" : "Not Available");
+
+        if (smver >= 0x30)
+            dl_fn->nvenc_devices[dl_fn->nvenc_device_count++] = cu_device;
+    }
+
+    if (!dl_fn->nvenc_device_count) {
+        av_log(avctx, AV_LOG_FATAL, "No NVENC capable devices found\n");
+        goto error;
+    }
+
+    return 1;
+
+error:
+
+    dl_fn->nvenc_device_count = 0;
+
+    return 0;
+}
+
+static av_cold int nvenc_dyload_nvenc(AVCodecContext *avctx)
+{
+    PNVENCODEAPICREATEINSTANCE nvEncodeAPICreateInstance = 0;
+    NVENCSTATUS nvstatus;
+
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+
+    if (!nvenc_check_cuda(avctx))
+        return 0;
+
+    if (dl_fn->nvenc_lib)
+        return 1;
+
+#if defined(_WIN32)
+    if (sizeof(void*) == 8) {
+        dl_fn->nvenc_lib = LoadLibrary(TEXT("nvEncodeAPI64.dll"));
+    } else {
+        dl_fn->nvenc_lib = LoadLibrary(TEXT("nvEncodeAPI.dll"));
+    }
+#elif defined(__CYGWIN__)
+    if (sizeof(void*) == 8) {
+        dl_fn->nvenc_lib = dlopen("nvEncodeAPI64.dll", RTLD_LAZY);
+    } else {
+        dl_fn->nvenc_lib = dlopen("nvEncodeAPI.dll", RTLD_LAZY);
+    }
+#else
+    dl_fn->nvenc_lib = dlopen("libnvidia-encode.so.1", RTLD_LAZY);
+#endif
+
+    if (!dl_fn->nvenc_lib) {
+        av_log(avctx, AV_LOG_FATAL, "Failed loading the nvenc library\n");
+        goto error;
+    }
+
+    nvEncodeAPICreateInstance = (PNVENCODEAPICREATEINSTANCE)LOAD_FUNC(dl_fn->nvenc_lib, "NvEncodeAPICreateInstance");
+
+    if (!nvEncodeAPICreateInstance) {
+        av_log(avctx, AV_LOG_FATAL, "Failed to load nvenc entrypoint\n");
+        goto error;
+    }
+
+    dl_fn->nvenc_funcs.version = NV_ENCODE_API_FUNCTION_LIST_VER;
+
+    nvstatus = nvEncodeAPICreateInstance(&dl_fn->nvenc_funcs);
+
+    if (nvstatus != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, "Failed to create nvenc instance\n");
+        goto error;
+    }
+
+    av_log(avctx, AV_LOG_VERBOSE, "Nvenc initialized successfully\n");
+
+    return 1;
+
+error:
+    if (dl_fn->nvenc_lib)
+        DL_CLOSE_FUNC(dl_fn->nvenc_lib);
+
+    dl_fn->nvenc_lib = NULL;
+
+    return 0;
+}
+
+static av_cold void nvenc_unload_nvenc(AVCodecContext *avctx)
+{
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+
+    DL_CLOSE_FUNC(dl_fn->nvenc_lib);
+    dl_fn->nvenc_lib = NULL;
+
+    dl_fn->nvenc_device_count = 0;
+
+    DL_CLOSE_FUNC(dl_fn->cuda_lib);
+    dl_fn->cuda_lib = NULL;
+
+    dl_fn->cu_init = NULL;
+    dl_fn->cu_device_get_count = NULL;
+    dl_fn->cu_device_get = NULL;
+    dl_fn->cu_device_get_name = NULL;
+    dl_fn->cu_device_compute_capability = NULL;
+    dl_fn->cu_ctx_create = NULL;
+    dl_fn->cu_ctx_pop_current = NULL;
+    dl_fn->cu_ctx_destroy = NULL;
+
+    av_log(avctx, AV_LOG_VERBOSE, "Nvenc unloaded\n");
+}
+
+static av_cold int nvenc_encode_init(AVCodecContext *avctx)
+{
+    NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS encode_session_params = { 0 };
+    NV_ENC_PRESET_CONFIG preset_config = { 0 };
+    CUcontext cu_context_curr;
+    CUresult cu_res;
+    GUID encoder_preset = NV_ENC_PRESET_HQ_GUID;
+    GUID license = dummy_license;
+    NVENCSTATUS nv_status = NV_ENC_SUCCESS;
+    int surfaceCount = 0;
+    int i, num_mbs;
+    int isLL = 0;
+    int res = 0;
+
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+    NV_ENCODE_API_FUNCTION_LIST *p_nvenc = &dl_fn->nvenc_funcs;
+
+    if (!nvenc_dyload_nvenc(avctx))
+        return AVERROR_EXTERNAL;
+
+    avctx->coded_frame = av_frame_alloc();
+    if (!avctx->coded_frame) {
+        res = AVERROR(ENOMEM);
+        goto error;
+    }
+
+    ctx->last_dts = AV_NOPTS_VALUE;
+
+    ctx->encode_config.version = NV_ENC_CONFIG_VER;
+    ctx->init_encode_params.version = NV_ENC_INITIALIZE_PARAMS_VER;
+    preset_config.version = NV_ENC_PRESET_CONFIG_VER;
+    preset_config.presetCfg.version = NV_ENC_CONFIG_VER;
+    encode_session_params.version = NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER;
+    encode_session_params.apiVersion = NVENCAPI_VERSION;
+    encode_session_params.clientKeyPtr = &license;
+
+    if (ctx->gpu >= dl_fn->nvenc_device_count) {
+        av_log(avctx, AV_LOG_FATAL, "Requested GPU %d, but only %d GPUs are available!\n", ctx->gpu, dl_fn->nvenc_device_count);
+        res = AVERROR(EINVAL);
+        goto error;
+    }
+
+    ctx->cu_context = NULL;
+    cu_res = dl_fn->cu_ctx_create(&ctx->cu_context, 0, dl_fn->nvenc_devices[ctx->gpu]);
+
+    if (cu_res != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, "Failed creating CUDA context for NVENC: 0x%x\n", (int)cu_res);
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    cu_res = dl_fn->cu_ctx_pop_current(&cu_context_curr);
+
+    if (cu_res != CUDA_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, "Failed popping CUDA context: 0x%x\n", (int)cu_res);
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    encode_session_params.device = ctx->cu_context;
+    encode_session_params.deviceType = NV_ENC_DEVICE_TYPE_CUDA;
+
+    nv_status = p_nvenc->nvEncOpenEncodeSessionEx(&encode_session_params, &ctx->nvencoder);
+    if (nv_status != NV_ENC_SUCCESS) {
+        ctx->nvencoder = NULL;
+        av_log(avctx, AV_LOG_FATAL, "OpenEncodeSessionEx failed: 0x%x - invalid license key?\n", (int)nv_status);
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    if (ctx->preset) {
+        if (!strcmp(ctx->preset, "hp")) {
+            encoder_preset = NV_ENC_PRESET_HP_GUID;
+        } else if (!strcmp(ctx->preset, "hq")) {
+            encoder_preset = NV_ENC_PRESET_HQ_GUID;
+        } else if (!strcmp(ctx->preset, "bd")) {
+            encoder_preset = NV_ENC_PRESET_BD_GUID;
+        } else if (!strcmp(ctx->preset, "ll")) {
+            encoder_preset = NV_ENC_PRESET_LOW_LATENCY_DEFAULT_GUID;
+            isLL = 1;
+        } else if (!strcmp(ctx->preset, "llhp")) {
+            encoder_preset = NV_ENC_PRESET_LOW_LATENCY_HP_GUID;
+            isLL = 1;
+        } else if (!strcmp(ctx->preset, "llhq")) {
+            encoder_preset = NV_ENC_PRESET_LOW_LATENCY_HQ_GUID;
+            isLL = 1;
+        } else if (!strcmp(ctx->preset, "default")) {
+            encoder_preset = NV_ENC_PRESET_DEFAULT_GUID;
+        } else {
+            av_log(avctx, AV_LOG_FATAL, "Preset \"%s\" is unknown! Supported presets: hp, hq, bd, ll, llhp, llhq, default\n", ctx->preset);
+            res = AVERROR(EINVAL);
+            goto error;
+        }
+    }
+
+    nv_status = p_nvenc->nvEncGetEncodePresetConfig(ctx->nvencoder, NV_ENC_CODEC_H264_GUID, encoder_preset, &preset_config);
+    if (nv_status != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, "GetEncodePresetConfig failed: 0x%x\n", (int)nv_status);
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    ctx->init_encode_params.encodeGUID = NV_ENC_CODEC_H264_GUID;
+    ctx->init_encode_params.encodeHeight = avctx->height;
+    ctx->init_encode_params.encodeWidth = avctx->width;
+    ctx->init_encode_params.darHeight = avctx->height;
+    ctx->init_encode_params.darWidth = avctx->width;
+    ctx->init_encode_params.frameRateNum = avctx->time_base.den;
+    ctx->init_encode_params.frameRateDen = avctx->time_base.num * avctx->ticks_per_frame;
+
+    num_mbs = ((avctx->width + 15) >> 4) * ((avctx->height + 15) >> 4);
+    ctx->max_surface_count = (num_mbs >= 8160) ? 32 : 48;
+
+    ctx->init_encode_params.enableEncodeAsync = 0;
+    ctx->init_encode_params.enablePTD = 1;
+
+    ctx->init_encode_params.presetGUID = encoder_preset;
+
+    ctx->init_encode_params.encodeConfig = &ctx->encode_config;
+    memcpy(&ctx->encode_config, &preset_config.presetCfg, sizeof(ctx->encode_config));
+    ctx->encode_config.version = NV_ENC_CONFIG_VER;
+
+    if (avctx->gop_size >= 0) {
+        ctx->encode_config.gopLength = avctx->gop_size;
+        ctx->encode_config.encodeCodecConfig.h264Config.idrPeriod = avctx->gop_size;
+    }
+
+    if (avctx->bit_rate > 0)
+        ctx->encode_config.rcParams.averageBitRate = avctx->bit_rate;
+
+    if (avctx->rc_max_rate > 0)
+        ctx->encode_config.rcParams.maxBitRate = avctx->rc_max_rate;
+
+    if (ctx->cbr) {
+        if (!ctx->twopass) {
+            ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_CBR;
+        } else if (ctx->twopass == 1 || isLL) {
+            ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_2_PASS_QUALITY;
+
+            ctx->encode_config.encodeCodecConfig.h264Config.adaptiveTransformMode = NV_ENC_H264_ADAPTIVE_TRANSFORM_ENABLE;
+            ctx->encode_config.encodeCodecConfig.h264Config.fmoMode = NV_ENC_H264_FMO_DISABLE;
+
+            if (!isLL)
+                av_log(avctx, AV_LOG_WARNING, "Twopass mode is only known to work with low latency (ll, llhq, llhp) presets.\n");
+        } else {
+            ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_CBR;
+        }
+    } else if (avctx->global_quality > 0) {
+        ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_CONSTQP;
+        ctx->encode_config.rcParams.constQP.qpInterB = avctx->global_quality;
+        ctx->encode_config.rcParams.constQP.qpInterP = avctx->global_quality;
+        ctx->encode_config.rcParams.constQP.qpIntra = avctx->global_quality;
+
+        avctx->qmin = -1;
+        avctx->qmax = -1;
+    } else if (avctx->qmin >= 0 && avctx->qmax >= 0) {
+        ctx->encode_config.rcParams.rateControlMode = NV_ENC_PARAMS_RC_VBR;
+
+        ctx->encode_config.rcParams.enableMinQP = 1;
+        ctx->encode_config.rcParams.enableMaxQP = 1;
+
+        ctx->encode_config.rcParams.minQP.qpInterB = avctx->qmin;
+        ctx->encode_config.rcParams.minQP.qpInterP = avctx->qmin;
+        ctx->encode_config.rcParams.minQP.qpIntra = avctx->qmin;
+
+        ctx->encode_config.rcParams.maxQP.qpInterB = avctx->qmax;
+        ctx->encode_config.rcParams.maxQP.qpInterP = avctx->qmax;
+        ctx->encode_config.rcParams.maxQP.qpIntra = avctx->qmax;
+    }
+
+    if (avctx->rc_buffer_size > 0)
+        ctx->encode_config.rcParams.vbvBufferSize = avctx->rc_buffer_size;
+
+    if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
+        ctx->encode_config.frameFieldMode = NV_ENC_PARAMS_FRAME_FIELD_MODE_FIELD;
+    } else {
+        ctx->encode_config.frameFieldMode = NV_ENC_PARAMS_FRAME_FIELD_MODE_FRAME;
+    }
+
+    switch (avctx->profile) {
+    case FF_PROFILE_H264_BASELINE:
+        ctx->encode_config.profileGUID = NV_ENC_H264_PROFILE_BASELINE_GUID;
+        break;
+    case FF_PROFILE_H264_MAIN:
+        ctx->encode_config.profileGUID = NV_ENC_H264_PROFILE_MAIN_GUID;
+        break;
+    case FF_PROFILE_H264_HIGH:
+    case FF_PROFILE_UNKNOWN:
+        ctx->encode_config.profileGUID = NV_ENC_H264_PROFILE_HIGH_GUID;
+        break;
+    default:
+        av_log(avctx, AV_LOG_WARNING, "Unsupported h264 profile requested, falling back to high\n");
+        ctx->encode_config.profileGUID = NV_ENC_H264_PROFILE_HIGH_GUID;
+        break;
+    }
+
+    if (ctx->gobpattern >= 0) {
+        ctx->encode_config.frameIntervalP = 1;
+    }
+
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.colourDescriptionPresentFlag = 1;
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.videoSignalTypePresentFlag = 1;
+
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.colourMatrix = avctx->colorspace;
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.colourPrimaries = avctx->color_primaries;
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.transferCharacteristics = avctx->color_trc;
+
+    ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.videoFullRangeFlag = avctx->color_range == AVCOL_RANGE_JPEG;
+
+    ctx->encode_config.encodeCodecConfig.h264Config.disableSPSPPS = (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
+
+    nv_status = p_nvenc->nvEncInitializeEncoder(ctx->nvencoder, &ctx->init_encode_params);
+    if (nv_status != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_FATAL, "InitializeEncoder failed: 0x%x\n", (int)nv_status);
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    ctx->input_surfaces = av_malloc(ctx->max_surface_count * sizeof(*ctx->input_surfaces));
+
+    if (!ctx->input_surfaces) {
+        res = AVERROR(ENOMEM);
+        goto error;
+    }
+
+    ctx->output_surfaces = av_malloc(ctx->max_surface_count * sizeof(*ctx->output_surfaces));
+
+    if (!ctx->output_surfaces) {
+        res = AVERROR(ENOMEM);
+        goto error;
+    }
+
+    for (surfaceCount = 0; surfaceCount < ctx->max_surface_count; ++surfaceCount) {
+        NV_ENC_CREATE_INPUT_BUFFER allocSurf = { 0 };
+        NV_ENC_CREATE_BITSTREAM_BUFFER allocOut = { 0 };
+        allocSurf.version = NV_ENC_CREATE_INPUT_BUFFER_VER;
+        allocOut.version = NV_ENC_CREATE_BITSTREAM_BUFFER_VER;
+
+        allocSurf.width = (avctx->width + 31) & ~31;
+        allocSurf.height = (avctx->height + 31) & ~31;
+
+        allocSurf.memoryHeap = NV_ENC_MEMORY_HEAP_SYSMEM_CACHED;
+
+        switch (avctx->pix_fmt) {
+        case AV_PIX_FMT_YUV420P:
+            allocSurf.bufferFmt = NV_ENC_BUFFER_FORMAT_YV12_PL;
+            break;
+
+        case AV_PIX_FMT_NV12:
+            allocSurf.bufferFmt = NV_ENC_BUFFER_FORMAT_NV12_PL;
+            break;
+
+        case AV_PIX_FMT_YUV444P:
+            allocSurf.bufferFmt = NV_ENC_BUFFER_FORMAT_YUV444_PL;
+            break;
+
+        default:
+            av_log(avctx, AV_LOG_FATAL, "Invalid input pixel format\n");
+            res = AVERROR(EINVAL);
+            goto error;
+        }
+
+        nv_status = p_nvenc->nvEncCreateInputBuffer(ctx->nvencoder, &allocSurf);
+        if (nv_status = NV_ENC_SUCCESS){
+            av_log(avctx, AV_LOG_FATAL, "CreateInputBuffer failed\n");
+            res = AVERROR_EXTERNAL;
+            goto error;
+        }
+
+        ctx->input_surfaces[surfaceCount].lockCount = 0;
+        ctx->input_surfaces[surfaceCount].input_surface = allocSurf.inputBuffer;
+        ctx->input_surfaces[surfaceCount].format = allocSurf.bufferFmt;
+        ctx->input_surfaces[surfaceCount].width = allocSurf.width;
+        ctx->input_surfaces[surfaceCount].height = allocSurf.height;
+
+        /* 1MB is large enough to hold most output frames. NVENC increases this automaticaly if it's not enough. */
+        allocOut.size = 1024 * 1024;
+
+        allocOut.memoryHeap = NV_ENC_MEMORY_HEAP_SYSMEM_CACHED;
+
+        nv_status = p_nvenc->nvEncCreateBitstreamBuffer(ctx->nvencoder, &allocOut);
+        if (nv_status = NV_ENC_SUCCESS) {
+            av_log(avctx, AV_LOG_FATAL, "CreateBitstreamBuffer failed\n");
+            ctx->output_surfaces[surfaceCount++].output_surface = NULL;
+            res = AVERROR_EXTERNAL;
+            goto error;
+        }
+
+        ctx->output_surfaces[surfaceCount].output_surface = allocOut.bitstreamBuffer;
+        ctx->output_surfaces[surfaceCount].size = allocOut.size;
+        ctx->output_surfaces[surfaceCount].busy = 0;
+    }
+
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
+        uint32_t outSize = 0;
+        char tmpHeader[256];
+        NV_ENC_SEQUENCE_PARAM_PAYLOAD payload = { 0 };
+        payload.version = NV_ENC_SEQUENCE_PARAM_PAYLOAD_VER;
+
+        payload.spsppsBuffer = tmpHeader;
+        payload.inBufferSize = sizeof(tmpHeader);
+        payload.outSPSPPSPayloadSize = &outSize;
+
+        nv_status = p_nvenc->nvEncGetSequenceParams(ctx->nvencoder, &payload);
+        if (nv_status != NV_ENC_SUCCESS) {
+            av_log(avctx, AV_LOG_FATAL, "GetSequenceParams failed\n");
+            goto error;
+        }
+
+        avctx->extradata_size = outSize;
+        avctx->extradata = av_mallocz(outSize + FF_INPUT_BUFFER_PADDING_SIZE);
+
+        if (!avctx->extradata) {
+            res = AVERROR(ENOMEM);
+            goto error;
+        }
+
+        memcpy(avctx->extradata, tmpHeader, outSize);
+    }
+
+    if (ctx->encode_config.frameIntervalP > 1)
+        avctx->has_b_frames = 2;
+
+    if (ctx->encode_config.rcParams.averageBitRate > 0)
+        avctx->bit_rate = ctx->encode_config.rcParams.averageBitRate;
+
+    return 0;
+
+error:
+
+    for (i = 0; i < surfaceCount; ++i) {
+        p_nvenc->nvEncDestroyInputBuffer(ctx->nvencoder, ctx->input_surfaces[i].input_surface);
+        if (ctx->output_surfaces[i].output_surface)
+            p_nvenc->nvEncDestroyBitstreamBuffer(ctx->nvencoder, ctx->output_surfaces[i].output_surface);
+    }
+
+    if (ctx->nvencoder)
+        p_nvenc->nvEncDestroyEncoder(ctx->nvencoder);
+
+    if (ctx->cu_context)
+        dl_fn->cu_ctx_destroy(ctx->cu_context);
+
+    av_frame_free(&avctx->coded_frame);
+
+    nvenc_unload_nvenc(avctx);
+
+    ctx->nvencoder = NULL;
+    ctx->cu_context = NULL;
+
+    return res;
+}
+
+static av_cold int nvenc_encode_close(AVCodecContext *avctx)
+{
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+    NV_ENCODE_API_FUNCTION_LIST *p_nvenc = &dl_fn->nvenc_funcs;
+    int i;
+
+    av_freep(&ctx->timestamp_list.data);
+    av_freep(&ctx->output_surface_ready_queue.data);
+    av_freep(&ctx->output_surface_queue.data);
+
+    for (i = 0; i < ctx->max_surface_count; ++i) {
+        p_nvenc->nvEncDestroyInputBuffer(ctx->nvencoder, ctx->input_surfaces[i].input_surface);
+        p_nvenc->nvEncDestroyBitstreamBuffer(ctx->nvencoder, ctx->output_surfaces[i].output_surface);
+    }
+    ctx->max_surface_count = 0;
+
+    p_nvenc->nvEncDestroyEncoder(ctx->nvencoder);
+    ctx->nvencoder = NULL;
+
+    dl_fn->cu_ctx_destroy(ctx->cu_context);
+    ctx->cu_context = NULL;
+
+    nvenc_unload_nvenc(avctx);
+
+    av_frame_free(&avctx->coded_frame);
+
+    return 0;
+}
+
+static int process_output_surface(AVCodecContext *avctx, AVPacket *pkt, AVFrame *coded_frame, NvencOutputSurface *tmpoutsurf)
+{
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+    NV_ENCODE_API_FUNCTION_LIST *p_nvenc = &dl_fn->nvenc_funcs;
+
+    uint32_t *slice_offsets = av_mallocz(ctx->encode_config.encodeCodecConfig.h264Config.sliceModeData * sizeof(*slice_offsets));
+    NV_ENC_LOCK_BITSTREAM lock_params = { 0 };
+    NVENCSTATUS nv_status;
+    int res = 0;
+
+    if (!slice_offsets)
+        return AVERROR(ENOMEM);
+
+    lock_params.version = NV_ENC_LOCK_BITSTREAM_VER;
+
+    lock_params.doNotWait = 0;
+    lock_params.outputBitstream = tmpoutsurf->output_surface;
+    lock_params.sliceOffsets = slice_offsets;
+
+    nv_status = p_nvenc->nvEncLockBitstream(ctx->nvencoder, &lock_params);
+    if (nv_status != NV_ENC_SUCCESS) {
+        av_log(avctx, AV_LOG_ERROR, "Failed locking bitstream buffer\n");
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    if (res = ff_alloc_packet2(avctx, pkt, lock_params.bitstreamSizeInBytes)) {
+        p_nvenc->nvEncUnlockBitstream(ctx->nvencoder, tmpoutsurf->output_surface);
+        goto error;
+    }
+
+    memcpy(pkt->data, lock_params.bitstreamBufferPtr, lock_params.bitstreamSizeInBytes);
+
+    nv_status = p_nvenc->nvEncUnlockBitstream(ctx->nvencoder, tmpoutsurf->output_surface);
+    if (nv_status != NV_ENC_SUCCESS)
+        av_log(avctx, AV_LOG_ERROR, "Failed unlocking bitstream buffer, expect the gates of mordor to open\n");
+
+    switch (lock_params.pictureType) {
+    case NV_ENC_PIC_TYPE_IDR:
+        pkt->flags |= AV_PKT_FLAG_KEY;
+    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;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown picture type encountered, expect the output to be broken.\n");
+        av_log(avctx, AV_LOG_ERROR, "Please report this error and include as much information on how to reproduce it as possible.\n");
+        res = AVERROR_EXTERNAL;
+        goto error;
+    }
+
+    pkt->pts = lock_params.outputTimeStamp;
+    pkt->dts = timestamp_queue_dequeue(&ctx->timestamp_list);
+
+    if (pkt->dts > pkt->pts)
+        pkt->dts = pkt->pts;
+
+    if (ctx->last_dts != AV_NOPTS_VALUE && pkt->dts <= ctx->last_dts)
+        pkt->dts = ctx->last_dts + 1;
+
+    ctx->last_dts = pkt->dts;
+
+    av_free(slice_offsets);
+
+    return 0;
+
+error:
+
+    av_free(slice_offsets);
+    timestamp_queue_dequeue(&ctx->timestamp_list);
+
+    return res;
+}
+
+static int nvenc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+    const AVFrame *frame, int *got_packet)
+{
+    NVENCSTATUS nv_status;
+    NvencOutputSurface *tmpoutsurf;
+    int res, i = 0;
+
+    NvencContext *ctx = avctx->priv_data;
+    NvencDynLoadFunctions *dl_fn = &ctx->nvenc_dload_funcs;
+    NV_ENCODE_API_FUNCTION_LIST *p_nvenc = &dl_fn->nvenc_funcs;
+
+    NV_ENC_PIC_PARAMS pic_params = { 0 };
+    pic_params.version = NV_ENC_PIC_PARAMS_VER;
+
+    if (frame) {
+        NV_ENC_LOCK_INPUT_BUFFER lockBufferParams = { 0 };
+        NvencInputSurface *inSurf = NULL;
+
+        for (i = 0; i < ctx->max_surface_count; ++i) {
+            if (!ctx->input_surfaces[i].lockCount) {
+                inSurf = &ctx->input_surfaces[i];
+                break;
+            }
+        }
+
+        av_assert0(inSurf);
+
+        inSurf->lockCount = 1;
+
+        lockBufferParams.version = NV_ENC_LOCK_INPUT_BUFFER_VER;
+        lockBufferParams.inputBuffer = inSurf->input_surface;
+
+        nv_status = p_nvenc->nvEncLockInputBuffer(ctx->nvencoder, &lockBufferParams);
+        if (nv_status != NV_ENC_SUCCESS) {
+            av_log(avctx, AV_LOG_ERROR, "Failed locking nvenc input buffer\n");
+            return 0;
+        }
+
+        if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
+            uint8_t *buf = lockBufferParams.bufferDataPtr;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[0], frame->linesize[0],
+                avctx->width, avctx->height);
+
+            buf += inSurf->height * lockBufferParams.pitch;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch >> 1,
+                frame->data[2], frame->linesize[2],
+                avctx->width >> 1, avctx->height >> 1);
+
+            buf += (inSurf->height * lockBufferParams.pitch) >> 2;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch >> 1,
+                frame->data[1], frame->linesize[1],
+                avctx->width >> 1, avctx->height >> 1);
+        } else if (avctx->pix_fmt == AV_PIX_FMT_NV12) {
+            uint8_t *buf = lockBufferParams.bufferDataPtr;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[0], frame->linesize[0],
+                avctx->width, avctx->height);
+
+            buf += inSurf->height * lockBufferParams.pitch;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[1], frame->linesize[1],
+                avctx->width, avctx->height >> 1);
+        } else if (avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
+            uint8_t *buf = lockBufferParams.bufferDataPtr;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[0], frame->linesize[0],
+                avctx->width, avctx->height);
+
+            buf += inSurf->height * lockBufferParams.pitch;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[1], frame->linesize[1],
+                avctx->width, avctx->height);
+
+            buf += inSurf->height * lockBufferParams.pitch;
+
+            av_image_copy_plane(buf, lockBufferParams.pitch,
+                frame->data[2], frame->linesize[2],
+                avctx->width, avctx->height);
+        } else {
+            av_log(avctx, AV_LOG_FATAL, "Invalid pixel format!\n");
+            return AVERROR(EINVAL);
+        }
+
+        nv_status = p_nvenc->nvEncUnlockInputBuffer(ctx->nvencoder, inSurf->input_surface);
+        if (nv_status != NV_ENC_SUCCESS) {
+            av_log(avctx, AV_LOG_FATAL, "Failed unlocking input buffer!\n");
+            return AVERROR_EXTERNAL;
+        }
+
+        for (i = 0; i < ctx->max_surface_count; ++i)
+            if (!ctx->output_surfaces[i].busy)
+                break;
+
+        if (i == ctx->max_surface_count) {
+            inSurf->lockCount = 0;
+            av_log(avctx, AV_LOG_FATAL, "No free output surface found!\n");
+            return AVERROR_EXTERNAL;
+        }
+
+        ctx->output_surfaces[i].input_surface = inSurf;
+
+        pic_params.inputBuffer = inSurf->input_surface;
+        pic_params.bufferFmt = inSurf->format;
+        pic_params.inputWidth = avctx->width;
+        pic_params.inputHeight = avctx->height;
+        pic_params.outputBitstream = ctx->output_surfaces[i].output_surface;
+        pic_params.completionEvent = 0;
+
+        if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
+            if (frame->top_field_first) {
+                pic_params.pictureStruct = NV_ENC_PIC_STRUCT_FIELD_TOP_BOTTOM;
+            } else {
+                pic_params.pictureStruct = NV_ENC_PIC_STRUCT_FIELD_BOTTOM_TOP;
+            }
+        } else {
+            pic_params.pictureStruct = NV_ENC_PIC_STRUCT_FRAME;
+        }
+
+        pic_params.encodePicFlags = 0;
+        pic_params.inputTimeStamp = frame->pts;
+        pic_params.inputDuration = 0;
+        pic_params.codecPicParams.h264PicParams.sliceMode = ctx->encode_config.encodeCodecConfig.h264Config.sliceMode;
+        pic_params.codecPicParams.h264PicParams.sliceModeData = ctx->encode_config.encodeCodecConfig.h264Config.sliceModeData;
+        memcpy(&pic_params.rcParams, &ctx->encode_config.rcParams, sizeof(NV_ENC_RC_PARAMS));
+
+        res = timestamp_queue_enqueue(&ctx->timestamp_list, frame->pts);
+
+        if (res)
+            return res;
+    } else {
+        pic_params.encodePicFlags = NV_ENC_PIC_FLAG_EOS;
+    }
+
+    nv_status = p_nvenc->nvEncEncodePicture(ctx->nvencoder, &pic_params);
+
+    if (frame && nv_status == NV_ENC_ERR_NEED_MORE_INPUT) {
+        res = out_surf_queue_enqueue(&ctx->output_surface_queue, &ctx->output_surfaces[i]);
+
+        if (res)
+            return res;
+
+        ctx->output_surfaces[i].busy = 1;
+    }
+
+    if (nv_status != NV_ENC_SUCCESS && nv_status != NV_ENC_ERR_NEED_MORE_INPUT) {
+        av_log(avctx, AV_LOG_ERROR, "EncodePicture failed!\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    if (nv_status != NV_ENC_ERR_NEED_MORE_INPUT) {
+        while (ctx->output_surface_queue.count) {
+            tmpoutsurf = out_surf_queue_dequeue(&ctx->output_surface_queue);
+            res = out_surf_queue_enqueue(&ctx->output_surface_ready_queue, tmpoutsurf);
+
+            if (res)
+                return res;
+        }
+
+        if (frame) {
+            res = out_surf_queue_enqueue(&ctx->output_surface_ready_queue, &ctx->output_surfaces[i]);
+
+            if (res)
+                return res;
+
+            ctx->output_surfaces[i].busy = 1;
+        }
+    }
+
+    if (ctx->output_surface_ready_queue.count) {
+        tmpoutsurf = out_surf_queue_dequeue(&ctx->output_surface_ready_queue);
+
+        res = process_output_surface(avctx, pkt, avctx->coded_frame, tmpoutsurf);
+
+        if (res)
+            return res;
+
+        tmpoutsurf->busy = 0;
+        av_assert0(tmpoutsurf->input_surface->lockCount);
+        tmpoutsurf->input_surface->lockCount--;
+
+        *got_packet = 1;
+    } else {
+        *got_packet = 0;
+    }
+
+    return 0;
+}
+
+static enum AVPixelFormat pix_fmts_nvenc[] = {
+    AV_PIX_FMT_NV12,
+    AV_PIX_FMT_NONE
+};
+
+#define OFFSET(x) offsetof(NvencContext, x)
+#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "preset", "Set the encoding preset (one of hq, hp, bd, ll, llhq, llhp, default)", OFFSET(preset), AV_OPT_TYPE_STRING, { .str = "hq" }, 0, 0, VE },
+    { "cbr", "Use cbr encoding mode", OFFSET(cbr), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
+    { "2pass", "Use 2pass cbr encoding mode (low latency mode only)", OFFSET(twopass), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, VE },
+    { "goppattern", "Specifies the GOP pattern as follows: 0: I, 1: IPP, 2: IBP, 3: IBBP", OFFSET(gobpattern), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 3, VE },
+    { "gpu", "Selects which NVENC capable GPU to use. First GPU is 0, second is 1, and so on.", OFFSET(gpu), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
+    { NULL }
+};
+
+static const AVClass nvenc_class = {
+    .class_name = "nvenc",
+    .item_name = av_default_item_name,
+    .option = options,
+    .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVCodecDefault nvenc_defaults[] = {
+    { "b", "0" },
+    { "qmin", "-1" },
+    { "qmax", "-1" },
+    { "qdiff", "-1" },
+    { "qblur", "-1" },
+    { "qcomp", "-1" },
+    { NULL },
+};
+
+AVCodec ff_nvenc_encoder = {
+    .name = "nvenc",
+    .long_name = NULL_IF_CONFIG_SMALL("Nvidia NVENC h264 encoder"),
+    .type = AVMEDIA_TYPE_VIDEO,
+    .id = AV_CODEC_ID_H264,
+    .priv_data_size = sizeof(NvencContext),
+    .init = nvenc_encode_init,
+    .encode2 = nvenc_encode_frame,
+    .close = nvenc_encode_close,
+    .capabilities = CODEC_CAP_DELAY,
+    .priv_class = &nvenc_class,
+    .defaults = nvenc_defaults,
+    .pix_fmts = pix_fmts_nvenc,
+};