gstreamer/sys/nvcodec/gstnvdec.c

/*
 * Copyright (C) 2017 Ericsson AB. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gstnvdec.h"

GST_DEBUG_CATEGORY_STATIC (gst_nvdec_debug_category);
#define GST_CAT_DEFAULT gst_nvdec_debug_category

static void
copy_video_frame_to_gl_textures (GstGLContext * context, gpointer * args);

static inline gboolean
cuda_OK (CUresult result)
{
  const gchar *error_name, *error_text;

  if (result != CUDA_SUCCESS) {
    CuGetErrorName (result, &error_name);
    CuGetErrorString (result, &error_text);
    GST_WARNING ("CUDA call failed: %s, %s", error_name, error_text);
    return FALSE;
  }

  return TRUE;
}

typedef struct _GstNvDecCudaGraphicsResourceInfo
{
  GstGLContext *gl_context;
  GstNvDec *nvdec;
  CUgraphicsResource resource;
} GstNvDecCudaGraphicsResourceInfo;

static void
register_cuda_resource (GstGLContext * context, gpointer * args)
{
  GstMemory *mem = GST_MEMORY_CAST (args[0]);
  GstNvDecCudaGraphicsResourceInfo *cgr_info =
      (GstNvDecCudaGraphicsResourceInfo *) args[1];
  GstMapInfo map_info = GST_MAP_INFO_INIT;
  guint texture_id;
  GstNvDec *nvdec = cgr_info->nvdec;

  if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0)))
    GST_WARNING_OBJECT (nvdec, "failed to lock CUDA context");

  if (gst_memory_map (mem, &map_info, GST_MAP_READ | GST_MAP_GL)) {
    texture_id = *(guint *) map_info.data;

    if (!cuda_OK (CuGraphicsGLRegisterImage (&cgr_info->resource, texture_id,
                GL_TEXTURE_2D, CU_GRAPHICS_REGISTER_FLAGS_WRITE_DISCARD)))
      GST_WARNING_OBJECT (nvdec, "failed to register texture with CUDA");

    gst_memory_unmap (mem, &map_info);
  } else
    GST_WARNING_OBJECT (nvdec, "failed to map memory");

  if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0)))
    GST_WARNING_OBJECT (nvdec, "failed to unlock CUDA context");
}

static void
unregister_cuda_resource (GstGLContext * context,
    GstNvDecCudaGraphicsResourceInfo * cgr_info)
{
  GstNvDec *nvdec = cgr_info->nvdec;

  if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0)))
    GST_WARNING_OBJECT (nvdec, "failed to lock CUDA context");

  if (!cuda_OK (CuGraphicsUnregisterResource ((const CUgraphicsResource)
              cgr_info->resource)))
    GST_WARNING_OBJECT (nvdec, "failed to unregister resource");

  if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0)))
    GST_WARNING_OBJECT (nvdec, "failed to unlock CUDA context");
}

static void
free_cgr_info (GstNvDecCudaGraphicsResourceInfo * cgr_info)
{
  gst_gl_context_thread_add (cgr_info->gl_context,
      (GstGLContextThreadFunc) unregister_cuda_resource, cgr_info);
  gst_object_unref (cgr_info->gl_context);
  g_slice_free (GstNvDecCudaGraphicsResourceInfo, cgr_info);
}

static CUgraphicsResource
ensure_cuda_graphics_resource (GstMemory * mem, GstNvDec * nvdec)
{
  static GQuark quark = 0;
  GstNvDecCudaGraphicsResourceInfo *cgr_info;
  gpointer args[2];

  if (!gst_is_gl_base_memory (mem)) {
    GST_WARNING ("memory is not GL base memory");
    return NULL;
  }

  if (!quark)
    quark = g_quark_from_static_string ("GstNvDecCudaGraphicsResourceInfo");

  cgr_info = gst_mini_object_get_qdata (GST_MINI_OBJECT (mem), quark);
  if (!cgr_info) {
    cgr_info = g_slice_new (GstNvDecCudaGraphicsResourceInfo);
    cgr_info->gl_context =
        gst_object_ref (GST_GL_BASE_MEMORY_CAST (mem)->context);
    cgr_info->nvdec = nvdec;
    args[0] = mem;
    args[1] = cgr_info;
    gst_gl_context_thread_add (cgr_info->gl_context,
        (GstGLContextThreadFunc) register_cuda_resource, args);
    gst_mini_object_set_qdata (GST_MINI_OBJECT (mem), quark, cgr_info,
        (GDestroyNotify) free_cgr_info);
  }

  return cgr_info->resource;
}

static gboolean gst_nvdec_start (GstVideoDecoder * decoder);
static gboolean gst_nvdec_stop (GstVideoDecoder * decoder);
static gboolean gst_nvdec_set_format (GstVideoDecoder * decoder,
    GstVideoCodecState * state);
static GstFlowReturn gst_nvdec_handle_frame (GstVideoDecoder * decoder,
    GstVideoCodecFrame * frame);
static gboolean gst_nvdec_decide_allocation (GstVideoDecoder * decoder,
    GstQuery * query);
static void gst_nvdec_set_context (GstElement * element, GstContext * context);
static gboolean gst_nvdec_src_query (GstVideoDecoder * decoder,
    GstQuery * query);
static gboolean gst_nvdec_flush (GstVideoDecoder * decoder);
static GstFlowReturn gst_nvdec_drain (GstVideoDecoder * decoder);
static GstFlowReturn gst_nvdec_finish (GstVideoDecoder * decoder);

G_DEFINE_ABSTRACT_TYPE (GstNvDec, gst_nvdec, GST_TYPE_VIDEO_DECODER);

static void
gst_nvdec_class_init (GstNvDecClass * klass)
{
  GstVideoDecoderClass *video_decoder_class = GST_VIDEO_DECODER_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_nvdec_start);
  video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_nvdec_stop);
  video_decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_nvdec_set_format);
  video_decoder_class->handle_frame =
      GST_DEBUG_FUNCPTR (gst_nvdec_handle_frame);
  video_decoder_class->decide_allocation =
      GST_DEBUG_FUNCPTR (gst_nvdec_decide_allocation);
  video_decoder_class->src_query = GST_DEBUG_FUNCPTR (gst_nvdec_src_query);
  video_decoder_class->drain = GST_DEBUG_FUNCPTR (gst_nvdec_drain);
  video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_nvdec_flush);
  video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_nvdec_finish);

  element_class->set_context = GST_DEBUG_FUNCPTR (gst_nvdec_set_context);
}

static void
gst_nvdec_init (GstNvDec * nvdec)
{
  gst_video_decoder_set_packetized (GST_VIDEO_DECODER (nvdec), TRUE);
  gst_video_decoder_set_needs_format (GST_VIDEO_DECODER (nvdec), TRUE);
}

static gboolean
parser_sequence_callback (GstNvDec * nvdec, CUVIDEOFORMAT * format)
{
  guint width, height, fps_n, fps_d;
  CUVIDDECODECREATEINFO create_info = { 0, };

  width = format->display_area.right - format->display_area.left;
  height = format->display_area.bottom - format->display_area.top;
  GST_DEBUG_OBJECT (nvdec, "width: %u, height: %u", width, height);

  if (!nvdec->decoder || (nvdec->width != width || nvdec->height != height)) {
    if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0))) {
      GST_ERROR_OBJECT (nvdec, "failed to lock CUDA context");
      goto error;
    }

    if (nvdec->decoder) {
      GST_DEBUG_OBJECT (nvdec, "destroying decoder");
      if (!cuda_OK (CuvidDestroyDecoder (nvdec->decoder))) {
        GST_ERROR_OBJECT (nvdec, "failed to destroy decoder");
        goto error;
      } else
        nvdec->decoder = NULL;
    }

    GST_DEBUG_OBJECT (nvdec, "creating decoder");
    create_info.ulWidth = width;
    create_info.ulHeight = height;
    create_info.ulNumDecodeSurfaces = 20;
    create_info.CodecType = format->codec;
    create_info.ChromaFormat = format->chroma_format;
    create_info.ulCreationFlags = cudaVideoCreate_Default;
    create_info.display_area.left = format->display_area.left;
    create_info.display_area.top = format->display_area.top;
    create_info.display_area.right = format->display_area.right;
    create_info.display_area.bottom = format->display_area.bottom;
    create_info.OutputFormat = cudaVideoSurfaceFormat_NV12;
    create_info.DeinterlaceMode = cudaVideoDeinterlaceMode_Weave;
    create_info.ulTargetWidth = width;
    create_info.ulTargetHeight = height;
    create_info.ulNumOutputSurfaces = 1;
    create_info.vidLock = nvdec->ctx_lock;
    create_info.target_rect.left = 0;
    create_info.target_rect.top = 0;
    create_info.target_rect.right = width;
    create_info.target_rect.bottom = height;

    if (nvdec->decoder
        || !cuda_OK (CuvidCreateDecoder (&nvdec->decoder, &create_info))) {
      GST_ERROR_OBJECT (nvdec, "failed to create decoder");
      goto error;
    }

    if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0))) {
      GST_ERROR_OBJECT (nvdec, "failed to unlock CUDA context");
      goto error;
    }
  }

  fps_n = format->frame_rate.numerator;
  fps_d = MAX (1, format->frame_rate.denominator);

  if (!gst_pad_has_current_caps (GST_VIDEO_DECODER_SRC_PAD (nvdec))
      || width != nvdec->width || height != nvdec->height
      || fps_n != nvdec->fps_n || fps_d != nvdec->fps_d) {
    GstVideoCodecState *state;
    GstVideoInfo *vinfo;
    GstStructure *in_s = NULL;

    nvdec->width = width;
    nvdec->height = height;
    nvdec->fps_n = fps_n;
    nvdec->fps_d = fps_d;

    state = gst_video_decoder_set_output_state (GST_VIDEO_DECODER (nvdec),
        GST_VIDEO_FORMAT_NV12, nvdec->width, nvdec->height, nvdec->input_state);
    vinfo = &state->info;
    vinfo->fps_n = fps_n;
    vinfo->fps_d = fps_d;
    if (format->progressive_sequence) {
      vinfo->interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE;

      /* nvdec doesn't seem to deal with interlacing with hevc so rely
       * on upstream's value */
      if (format->codec == cudaVideoCodec_HEVC) {
        vinfo->interlace_mode = nvdec->input_state->info.interlace_mode;
      }
    } else {
      vinfo->interlace_mode = GST_VIDEO_INTERLACE_MODE_MIXED;
    }

    GST_LOG_OBJECT (nvdec,
        "Reading colorimetry information full-range %d matrix %d transfer %d primaries %d",
        format->video_signal_description.video_full_range_flag,
        format->video_signal_description.matrix_coefficients,
        format->video_signal_description.transfer_characteristics,
        format->video_signal_description.color_primaries);

    if (nvdec->input_state->caps)
      in_s = gst_caps_get_structure (nvdec->input_state->caps, 0);

    /* Set colorimetry when upstream did not provide it */
    if (in_s && !gst_structure_has_field (in_s, "colorimetry")) {
      GstVideoColorimetry colorimetry = { 0, };

      if (format->video_signal_description.video_full_range_flag)
        colorimetry.range = GST_VIDEO_COLOR_RANGE_0_255;
      else
        colorimetry.range = GST_VIDEO_COLOR_RANGE_16_235;

      colorimetry.primaries =
          gst_video_color_primaries_from_iso
          (format->video_signal_description.color_primaries);

      colorimetry.transfer =
          gst_video_color_transfer_from_iso
          (format->video_signal_description.transfer_characteristics);

      colorimetry.matrix =
          gst_video_color_matrix_from_iso
          (format->video_signal_description.matrix_coefficients);

      /* Use a colorimetry having at least one valid colorimetry entry,
       * because we don't know whether the returned
       * colorimetry (by nvdec) was actually parsed information or not.
       * Otherwise let GstVideoInfo handle it with default colorimetry */
      if (colorimetry.primaries != GST_VIDEO_COLOR_PRIMARIES_UNKNOWN ||
          colorimetry.transfer != GST_VIDEO_TRANSFER_UNKNOWN ||
          colorimetry.matrix != GST_VIDEO_COLOR_MATRIX_UNKNOWN) {
        GST_DEBUG_OBJECT (nvdec,
            "Found valid colorimetry, update output colorimetry");
        vinfo->colorimetry = colorimetry;
      }
    }

    state->caps = gst_video_info_to_caps (&state->info);

    gst_caps_set_features (state->caps, 0,
        gst_caps_features_new (GST_CAPS_FEATURE_MEMORY_GL_MEMORY, NULL));
    gst_caps_set_simple (state->caps, "texture-target", G_TYPE_STRING,
        "2D", NULL);

    gst_video_codec_state_unref (state);

    if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (nvdec))) {
      GST_WARNING_OBJECT (nvdec, "failed to negotiate with downstream");
      nvdec->last_ret = GST_FLOW_NOT_NEGOTIATED;
      return FALSE;
    }
  }

  return TRUE;

error:
  nvdec->last_ret = GST_FLOW_ERROR;
  return FALSE;
}

static gboolean
parser_decode_callback (GstNvDec * nvdec, CUVIDPICPARAMS * params)
{
  GList *iter, *pending_frames;

  GST_LOG_OBJECT (nvdec, "picture index: %u", params->CurrPicIdx);

  if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0))) {
    GST_ERROR_OBJECT (nvdec, "failed to lock CUDA context");
    goto error;
  }

  if (!cuda_OK (CuvidDecodePicture (nvdec->decoder, params))) {
    GST_ERROR_OBJECT (nvdec, "failed to decode picture");
    goto error;
  }

  if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0))) {
    GST_ERROR_OBJECT (nvdec, "failed to unlock CUDA context");
    goto error;
  }

  pending_frames = gst_video_decoder_get_frames (GST_VIDEO_DECODER (nvdec));

  /* NOTE: this decode callback could be invoked multiple times for
   * one cuvidParseVideoData() call. Most likely it can be related to "decode only"
   * frame of VPX codec but no document available.
   * In that case, the last decoded frame seems to be displayed */

  for (iter = pending_frames; iter; iter = g_list_next (iter)) {
    guint id;
    GstVideoCodecFrame *frame = (GstVideoCodecFrame *) iter->data;
    gboolean set_data = FALSE;

    id = GPOINTER_TO_UINT (gst_video_codec_frame_get_user_data (frame));
    if (G_UNLIKELY (nvdec->state == GST_NVDEC_STATE_DECODE)) {
      if (id) {
        GST_LOG_OBJECT (nvdec, "reset the last user data");
        set_data = TRUE;
      }
    } else if (!id) {
      set_data = TRUE;
    }

    if (set_data) {
      gst_video_codec_frame_set_user_data (frame,
          GUINT_TO_POINTER (params->CurrPicIdx + 1), NULL);
      break;
    }
  }

  nvdec->state = GST_NVDEC_STATE_DECODE;

  g_list_free_full (pending_frames,
      (GDestroyNotify) gst_video_codec_frame_unref);

  return TRUE;

error:
  nvdec->last_ret = GST_FLOW_ERROR;
  return FALSE;
}

static gboolean
parser_display_callback (GstNvDec * nvdec, CUVIDPARSERDISPINFO * dispinfo)
{
  GList *iter, *pending_frames;
  GstVideoCodecFrame *frame = NULL;
  GstBuffer *output_buffer = NULL;
  GstFlowReturn ret = GST_FLOW_OK;
  guint num_resources, i;
  CUgraphicsResource *resources;
  gpointer args[4];
  GstMemory *mem;

  GST_LOG_OBJECT (nvdec, "picture index: %u", dispinfo->picture_index);

  pending_frames = gst_video_decoder_get_frames (GST_VIDEO_DECODER (nvdec));
  for (iter = pending_frames; iter; iter = g_list_next (iter)) {
    guint id;
    GstVideoCodecFrame *tmp = (GstVideoCodecFrame *) iter->data;

    id = GPOINTER_TO_UINT (gst_video_codec_frame_get_user_data (tmp));
    if (id == dispinfo->picture_index + 1) {
      frame = gst_video_codec_frame_ref (tmp);
      break;
    }
  }
  g_list_free_full (pending_frames,
      (GDestroyNotify) gst_video_codec_frame_unref);

  if (G_UNLIKELY (frame == NULL)) {
    GST_WARNING_OBJECT (nvdec, "no frame for picture index %u",
        dispinfo->picture_index);

    output_buffer =
        gst_video_decoder_allocate_output_buffer (GST_VIDEO_DECODER (nvdec));

    if (!output_buffer) {
      GST_ERROR_OBJECT (nvdec, "Couldn't allocate output buffer");
      nvdec->last_ret = GST_FLOW_ERROR;
      return FALSE;
    }

    GST_BUFFER_PTS (output_buffer) = dispinfo->timestamp;
    GST_BUFFER_DTS (output_buffer) = GST_CLOCK_TIME_NONE;
    /* assume buffer duration from framerate */
    GST_BUFFER_DURATION (output_buffer) =
        gst_util_uint64_scale (GST_SECOND, nvdec->fps_d, nvdec->fps_n);
  } else {
    ret = gst_video_decoder_allocate_output_frame (GST_VIDEO_DECODER (nvdec),
        frame);

    if (ret != GST_FLOW_OK) {
      GST_WARNING_OBJECT (nvdec, "failed to allocate output frame");
      nvdec->last_ret = ret;
      return FALSE;
    }

    output_buffer = frame->output_buffer;

    if (dispinfo->timestamp != frame->pts) {
      GST_INFO_OBJECT (nvdec,
          "timestamp mismatch, diff: %" GST_STIME_FORMAT,
          GST_STIME_ARGS (GST_CLOCK_DIFF (dispinfo->timestamp, frame->pts)));
      frame->pts = dispinfo->timestamp;
    }
  }

  num_resources = gst_buffer_n_memory (output_buffer);
  resources = g_new (CUgraphicsResource, num_resources);

  for (i = 0; i < num_resources; i++) {
    mem = gst_buffer_get_memory (output_buffer, i);
    resources[i] = ensure_cuda_graphics_resource (mem, nvdec);
    GST_MINI_OBJECT_FLAG_SET (mem, GST_GL_BASE_MEMORY_TRANSFER_NEED_DOWNLOAD);
    gst_memory_unref (mem);
  }

  args[0] = nvdec;
  args[1] = dispinfo;
  args[2] = resources;
  args[3] = GUINT_TO_POINTER (num_resources);
  gst_gl_context_thread_add (nvdec->gl_context,
      (GstGLContextThreadFunc) copy_video_frame_to_gl_textures, args);
  g_free (resources);

  if (!dispinfo->progressive_frame) {
    GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_INTERLACED);

    if (dispinfo->top_field_first) {
      GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_TFF);
    }

    if (dispinfo->repeat_first_field == -1) {
      GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_ONEFIELD);
    } else {
      GST_BUFFER_FLAG_SET (output_buffer, GST_VIDEO_BUFFER_FLAG_RFF);
    }
  }

  if (frame) {
    ret = gst_video_decoder_finish_frame (GST_VIDEO_DECODER (nvdec), frame);
  } else {
    ret = gst_pad_push (GST_VIDEO_DECODER_SRC_PAD (nvdec), output_buffer);
  }

  if (ret != GST_FLOW_OK) {
    GST_DEBUG_OBJECT (nvdec, "failed to finish frame %s",
        gst_flow_get_name (ret));
    nvdec->last_ret = ret;
    return FALSE;
  }

  return TRUE;
}

static gboolean
gst_nvdec_start (GstVideoDecoder * decoder)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  GstNvDecClass *klass = GST_NVDEC_GET_CLASS (nvdec);

  nvdec->state = GST_NVDEC_STATE_INIT;
  GST_DEBUG_OBJECT (nvdec, "creating CUDA context");

  if (!cuda_OK (CuInit (0))) {
    GST_ERROR_OBJECT (nvdec, "failed to init CUDA");
    return FALSE;
  }

  if (!cuda_OK (CuCtxCreate (&nvdec->context, 0, klass->cuda_device_id))) {
    GST_ERROR_OBJECT (nvdec,
        "failed to create CUDA context with device id %d",
        klass->cuda_device_id);
    return FALSE;
  }

  if (!cuda_OK (CuCtxPopCurrent (NULL))) {
    GST_ERROR_OBJECT (nvdec, "failed to pop current CUDA context");
    CuCtxDestroy (nvdec->context);
    nvdec->context = NULL;

    return FALSE;
  }

  if (!cuda_OK (CuvidCtxLockCreate (&nvdec->ctx_lock, nvdec->context))) {
    GST_ERROR_OBJECT (nvdec, "failed to create CUDA context lock");

    CuCtxDestroy (nvdec->context);
    nvdec->context = NULL;

    return FALSE;
  }

  nvdec->last_ret = GST_FLOW_OK;

  return TRUE;
}

static gboolean
maybe_destroy_decoder_and_parser (GstNvDec * nvdec)
{
  gboolean ret = TRUE;

  if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0))) {
    GST_ERROR_OBJECT (nvdec, "failed to lock CUDA context");
    return FALSE;
  }

  if (nvdec->decoder) {
    GST_DEBUG_OBJECT (nvdec, "destroying decoder");
    ret = cuda_OK (CuvidDestroyDecoder (nvdec->decoder));
    if (ret)
      nvdec->decoder = NULL;
    else
      GST_ERROR_OBJECT (nvdec, "failed to destroy decoder");
  }

  if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0))) {
    GST_ERROR_OBJECT (nvdec, "failed to unlock CUDA context");
    return FALSE;
  }

  if (nvdec->parser) {
    GST_DEBUG_OBJECT (nvdec, "destroying parser");
    if (!cuda_OK (CuvidDestroyVideoParser (nvdec->parser))) {
      GST_ERROR_OBJECT (nvdec, "failed to destroy parser");
      return FALSE;
    }
    nvdec->parser = NULL;
  }

  return ret;
}

static gboolean
gst_nvdec_stop (GstVideoDecoder * decoder)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);

  GST_DEBUG_OBJECT (nvdec, "stop");

  if (!maybe_destroy_decoder_and_parser (nvdec))
    return FALSE;

  if (nvdec->gl_context) {
    gst_object_unref (nvdec->gl_context);
    nvdec->gl_context = NULL;
  }

  if (nvdec->other_gl_context) {
    gst_object_unref (nvdec->other_gl_context);
    nvdec->other_gl_context = NULL;
  }

  if (nvdec->gl_display) {
    gst_object_unref (nvdec->gl_display);
    nvdec->gl_display = NULL;
  }

  if (nvdec->input_state) {
    gst_video_codec_state_unref (nvdec->input_state);
    nvdec->input_state = NULL;
  }

  if (nvdec->ctx_lock) {
    CuvidCtxLockDestroy (nvdec->ctx_lock);
    nvdec->ctx_lock = NULL;
  }

  if (nvdec->context) {
    CuCtxDestroy (nvdec->context);
    nvdec->context = NULL;
  }

  return TRUE;
}

static gboolean
gst_nvdec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  GstNvDecClass *klass = GST_NVDEC_GET_CLASS (decoder);
  CUVIDPARSERPARAMS parser_params = { 0, };

  GST_DEBUG_OBJECT (nvdec, "set format");

  if (nvdec->input_state)
    gst_video_codec_state_unref (nvdec->input_state);

  nvdec->input_state = gst_video_codec_state_ref (state);

  if (!maybe_destroy_decoder_and_parser (nvdec))
    return FALSE;

  parser_params.CodecType = klass->codec_type;
  parser_params.ulMaxNumDecodeSurfaces = 20;
  parser_params.ulErrorThreshold = 100;
  parser_params.ulMaxDisplayDelay = 0;
  parser_params.ulClockRate = GST_SECOND;
  parser_params.pUserData = nvdec;
  parser_params.pfnSequenceCallback =
      (PFNVIDSEQUENCECALLBACK) parser_sequence_callback;
  parser_params.pfnDecodePicture =
      (PFNVIDDECODECALLBACK) parser_decode_callback;
  parser_params.pfnDisplayPicture =
      (PFNVIDDISPLAYCALLBACK) parser_display_callback;

  GST_DEBUG_OBJECT (nvdec, "creating parser");
  if (!cuda_OK (CuvidCreateVideoParser (&nvdec->parser, &parser_params))) {
    GST_ERROR_OBJECT (nvdec, "failed to create parser");
    return FALSE;
  }

  return TRUE;
}

static void
copy_video_frame_to_gl_textures (GstGLContext * context, gpointer * args)
{
  GstNvDec *nvdec = GST_NVDEC (args[0]);
  CUVIDPARSERDISPINFO *dispinfo = (CUVIDPARSERDISPINFO *) args[1];
  CUgraphicsResource *resources = (CUgraphicsResource *) args[2];
  guint num_resources = GPOINTER_TO_UINT (args[3]);
  CUVIDPROCPARAMS proc_params = { 0, };
  guintptr dptr;
  CUarray array;
  guint pitch, i;
  CUDA_MEMCPY2D mcpy2d = { 0, };

  GST_LOG_OBJECT (nvdec, "picture index: %u", dispinfo->picture_index);

  proc_params.progressive_frame = dispinfo->progressive_frame;
  proc_params.top_field_first = dispinfo->top_field_first;
  proc_params.unpaired_field = dispinfo->repeat_first_field == -1;

  if (!cuda_OK (CuvidCtxLock (nvdec->ctx_lock, 0))) {
    GST_WARNING_OBJECT (nvdec, "failed to lock CUDA context");
    return;
  }

  if (!cuda_OK (CuvidMapVideoFrame (nvdec->decoder, dispinfo->picture_index,
              &dptr, &pitch, &proc_params))) {
    GST_WARNING_OBJECT (nvdec, "failed to map CUDA video frame");
    goto unlock_cuda_context;
  }

  if (!cuda_OK (CuGraphicsMapResources (num_resources, resources, NULL))) {
    GST_WARNING_OBJECT (nvdec, "failed to map CUDA resources");
    goto unmap_video_frame;
  }

  mcpy2d.srcMemoryType = CU_MEMORYTYPE_DEVICE;
  mcpy2d.srcPitch = pitch;
  mcpy2d.dstMemoryType = CU_MEMORYTYPE_ARRAY;
  mcpy2d.dstPitch = nvdec->width;
  mcpy2d.WidthInBytes = nvdec->width;

  for (i = 0; i < num_resources; i++) {
    if (!cuda_OK (CuGraphicsSubResourceGetMappedArray (&array, resources[i], 0,
                0))) {
      GST_WARNING_OBJECT (nvdec, "failed to map CUDA array");
      break;
    }

    mcpy2d.srcDevice = dptr + (i * pitch * nvdec->height);
    mcpy2d.dstArray = array;
    mcpy2d.Height = nvdec->height / (i + 1);

    if (!cuda_OK (CuMemcpy2D (&mcpy2d)))
      GST_WARNING_OBJECT (nvdec, "memcpy to mapped array failed");
  }

  if (!cuda_OK (CuGraphicsUnmapResources (num_resources, resources, NULL)))
    GST_WARNING_OBJECT (nvdec, "failed to unmap CUDA resources");

unmap_video_frame:
  if (!cuda_OK (CuvidUnmapVideoFrame (nvdec->decoder, dptr)))
    GST_WARNING_OBJECT (nvdec, "failed to unmap CUDA video frame");

unlock_cuda_context:
  if (!cuda_OK (CuvidCtxUnlock (nvdec->ctx_lock, 0)))
    GST_WARNING_OBJECT (nvdec, "failed to unlock CUDA context");
}

static GstFlowReturn
gst_nvdec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  GstMapInfo map_info = GST_MAP_INFO_INIT;
  CUVIDSOURCEDATAPACKET packet = { 0, };

  GST_LOG_OBJECT (nvdec, "handle frame");

  if (nvdec->last_ret != GST_FLOW_OK) {
    GST_DEBUG_OBJECT (nvdec,
        "return last flow %s", gst_flow_get_name (nvdec->last_ret));
    gst_video_codec_frame_unref (frame);
    return nvdec->last_ret;
  }

  /* initialize with zero to keep track of frames */
  gst_video_codec_frame_set_user_data (frame, GUINT_TO_POINTER (0), NULL);

  if (!gst_buffer_map (frame->input_buffer, &map_info, GST_MAP_READ)) {
    GST_ERROR_OBJECT (nvdec, "failed to map input buffer");
    gst_video_codec_frame_unref (frame);
    return GST_FLOW_ERROR;
  }

  packet.payload_size = (gulong) map_info.size;
  packet.payload = map_info.data;
  packet.timestamp = frame->pts;
  packet.flags = CUVID_PKT_TIMESTAMP;

  if (GST_BUFFER_IS_DISCONT (frame->input_buffer))
    packet.flags |= CUVID_PKT_DISCONTINUITY;

  nvdec->state = GST_NVDEC_STATE_PARSE;

  if (!cuda_OK (CuvidParseVideoData (nvdec->parser, &packet)))
    GST_WARNING_OBJECT (nvdec, "parser failed");

  gst_buffer_unmap (frame->input_buffer, &map_info);
  gst_video_codec_frame_unref (frame);

  return nvdec->last_ret;
}

static gboolean
gst_nvdec_flush (GstVideoDecoder * decoder)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  CUVIDSOURCEDATAPACKET packet = { 0, };

  GST_DEBUG_OBJECT (nvdec, "flush");

  packet.payload_size = 0;
  packet.payload = NULL;
  packet.flags = CUVID_PKT_ENDOFSTREAM;

  nvdec->state = GST_NVDEC_STATE_PARSE;

  if (!cuda_OK (CuvidParseVideoData (nvdec->parser, &packet)))
    GST_WARNING_OBJECT (nvdec, "parser failed");

  return TRUE;
}

static GstFlowReturn
gst_nvdec_drain (GstVideoDecoder * decoder)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  CUVIDSOURCEDATAPACKET packet = { 0, };

  GST_DEBUG_OBJECT (nvdec, "draining decoder");

  packet.payload_size = 0;
  packet.payload = NULL;
  packet.flags = CUVID_PKT_ENDOFSTREAM;

  if (!cuda_OK (CuvidParseVideoData (nvdec->parser, &packet)))
    GST_WARNING_OBJECT (nvdec, "parser failed");

  return nvdec->last_ret;
}

static GstFlowReturn
gst_nvdec_finish (GstVideoDecoder * decoder)
{
  GST_DEBUG_OBJECT (decoder, "finish");

  return gst_nvdec_drain (decoder);
}

static gboolean
gst_nvdec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);
  GstCaps *outcaps;
  GstBufferPool *pool = NULL;
  guint n, size, min, max;
  GstVideoInfo vinfo = { 0, };
  GstStructure *config;

  GST_DEBUG_OBJECT (nvdec, "decide allocation");

  if (!gst_gl_ensure_element_data (nvdec, &nvdec->gl_display,
          &nvdec->other_gl_context)) {
    GST_ERROR_OBJECT (nvdec, "failed to ensure OpenGL display");
    return FALSE;
  }

  if (!gst_gl_query_local_gl_context (GST_ELEMENT (decoder), GST_PAD_SRC,
          &nvdec->gl_context)) {
    GST_INFO_OBJECT (nvdec, "failed to query local OpenGL context");
    if (nvdec->gl_context)
      gst_object_unref (nvdec->gl_context);
    nvdec->gl_context =
        gst_gl_display_get_gl_context_for_thread (nvdec->gl_display, NULL);
    if (!nvdec->gl_context
        || !gst_gl_display_add_context (nvdec->gl_display, nvdec->gl_context)) {
      if (nvdec->gl_context)
        gst_object_unref (nvdec->gl_context);
      if (!gst_gl_display_create_context (nvdec->gl_display,
              nvdec->other_gl_context, &nvdec->gl_context, NULL)) {
        GST_ERROR_OBJECT (nvdec, "failed to create OpenGL context");
        return FALSE;
      }
      if (!gst_gl_display_add_context (nvdec->gl_display, nvdec->gl_context)) {
        GST_ERROR_OBJECT (nvdec,
            "failed to add the OpenGL context to the display");
        return FALSE;
      }
    }
  }

  gst_query_parse_allocation (query, &outcaps, NULL);
  n = gst_query_get_n_allocation_pools (query);
  if (n > 0) {
    gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
    if (!GST_IS_GL_BUFFER_POOL (pool)) {
      gst_object_unref (pool);
      pool = NULL;
    }
  }

  if (!pool) {
    pool = gst_gl_buffer_pool_new (nvdec->gl_context);

    if (outcaps)
      gst_video_info_from_caps (&vinfo, outcaps);
    size = (guint) vinfo.size;
    min = max = 0;
  }

  config = gst_buffer_pool_get_config (pool);
  gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
  gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
  gst_buffer_pool_set_config (pool, config);
  if (n > 0)
    gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
  else
    gst_query_add_allocation_pool (query, pool, size, min, max);
  gst_object_unref (pool);

  return GST_VIDEO_DECODER_CLASS (gst_nvdec_parent_class)->decide_allocation
      (decoder, query);
}

static gboolean
gst_nvdec_src_query (GstVideoDecoder * decoder, GstQuery * query)
{
  GstNvDec *nvdec = GST_NVDEC (decoder);

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_CONTEXT:
      if (gst_gl_handle_context_query (GST_ELEMENT (decoder), query,
              nvdec->gl_display, nvdec->gl_context, nvdec->other_gl_context))
        return TRUE;
      break;
    default:
      break;
  }

  return GST_VIDEO_DECODER_CLASS (gst_nvdec_parent_class)->src_query (decoder,
      query);
}

static void
gst_nvdec_set_context (GstElement * element, GstContext * context)
{
  GstNvDec *nvdec = GST_NVDEC (element);
  GST_DEBUG_OBJECT (nvdec, "set context");

  gst_gl_handle_set_context (element, context, &nvdec->gl_display,
      &nvdec->other_gl_context);

  GST_ELEMENT_CLASS (gst_nvdec_parent_class)->set_context (element, context);
}

typedef struct
{
  GstCaps *sink_caps;
  GstCaps *src_caps;
  cudaVideoCodec codec_type;
  gchar *codec;
  guint cuda_device_id;
  gboolean is_default;
} GstNvDecClassData;

static void
gst_nvdec_subclass_init (gpointer g_class, gpointer data)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
  GstNvDecClass *nvdec_class = GST_NVDEC_CLASS (g_class);
  GstNvDecClassData *cdata = data;
  gchar *long_name;

  if (cdata->is_default) {
    long_name = g_strdup_printf ("NVDEC %s Video Decoder", cdata->codec);
  } else {
    long_name = g_strdup_printf ("NVDEC %s Video Decoder with devide-id %d",
        cdata->codec, cdata->cuda_device_id);
  }

  gst_element_class_set_metadata (element_class, long_name,
      "Codec/Decoder/Video/Hardware", "NVDEC video decoder",
      "Ericsson AB, http://www.ericsson.com, "
      "Seungha Yang <seungha.yang@navercorp.com>");
  g_free (long_name);

  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
          cdata->sink_caps));
  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          cdata->src_caps));

  nvdec_class->codec_type = cdata->codec_type;
  nvdec_class->cuda_device_id = cdata->cuda_device_id;

  gst_caps_unref (cdata->sink_caps);
  gst_caps_unref (cdata->src_caps);
  g_free (cdata->codec);
  g_free (cdata);
}

static void
gst_nvdec_subclass_register (GstPlugin * plugin, GType type,
    cudaVideoCodec codec_type, const gchar * codec, guint device_id, guint rank,
    GstCaps * sink_caps, GstCaps * src_caps)
{
  GTypeQuery type_query;
  GTypeInfo type_info = { 0, };
  GType subtype;
  gchar *type_name;
  GstNvDecClassData *cdata;
  gboolean is_default = TRUE;

  cdata = g_new0 (GstNvDecClassData, 1);
  cdata->sink_caps = gst_caps_ref (sink_caps);
  cdata->src_caps = gst_caps_ref (src_caps);
  cdata->codec_type = codec_type;
  cdata->codec = g_strdup (codec);
  cdata->cuda_device_id = device_id;

  g_type_query (type, &type_query);
  memset (&type_info, 0, sizeof (type_info));
  type_info.class_size = type_query.class_size;
  type_info.instance_size = type_query.instance_size;
  type_info.class_init = gst_nvdec_subclass_init;
  type_info.class_data = cdata;

  type_name = g_strdup_printf ("nv%sdec", codec);

  if (g_type_from_name (type_name) != 0) {
    g_free (type_name);
    type_name = g_strdup_printf ("nv%sdevice%ddec", codec, device_id);
    is_default = FALSE;
  }

  cdata->is_default = is_default;
  subtype = g_type_register_static (type, type_name, &type_info, 0);

  /* make lower rank than default device */
  if (rank > 0 && !is_default)
    rank--;

  if (!gst_element_register (plugin, type_name, rank, subtype))
    GST_WARNING ("Failed to register plugin '%s'", type_name);

  g_free (type_name);
}

typedef struct
{
  guint idx;
  cudaVideoChromaFormat format;
} GstNvdecChromaMap;

static gboolean
gst_nvdec_register (GstPlugin * plugin, GType type, cudaVideoCodec codec_type,
    const gchar * codec, const gchar * sink_caps_string, guint rank,
    gint device_count)
{
  gint i;

  for (i = 0; i < device_count; i++) {
    CUdevice cuda_device;
    CUcontext cuda_ctx;
    CUresult cuda_ret;
    gint max_width = 0, min_width = G_MAXINT;
    gint max_height = 0, min_height = G_MAXINT;
    GstCaps *sink_templ = NULL;
    GstCaps *src_templ = NULL;
    /* FIXME: support 10/12bits format */
    guint bitdepth_minus8[1] = { 0 };
    gint c_idx, b_idx;
    guint num_support = 0;
    cudaVideoChromaFormat chroma_list[] = {
#if 0
      /* FIXME: support monochrome */
      cudaVideoChromaFormat_Monochrome,
      /* FIXME: Can our OpenGL support NV16 and its 10/12bits variant?? */
      cudaVideoChromaFormat_422,
      cudaVideoChromaFormat_444,
#endif
      cudaVideoChromaFormat_420,
    };
    GValue format_list = G_VALUE_INIT;
    GValue format = G_VALUE_INIT;

    if (CuDeviceGet (&cuda_device, i) != CUDA_SUCCESS)
      continue;

    if (CuCtxCreate (&cuda_ctx, 0, cuda_device) != CUDA_SUCCESS)
      continue;

    g_value_init (&format_list, GST_TYPE_LIST);
    g_value_init (&format, G_TYPE_STRING);

    if (CuCtxPushCurrent (cuda_ctx) != CUDA_SUCCESS)
      goto cuda_free;

    for (c_idx = 0; c_idx < G_N_ELEMENTS (chroma_list); c_idx++) {
      for (b_idx = 0; b_idx < G_N_ELEMENTS (bitdepth_minus8); b_idx++) {
        CUVIDDECODECAPS decoder_caps = { 0, };

        decoder_caps.eCodecType = codec_type;
        decoder_caps.eChromaFormat = chroma_list[c_idx];
        decoder_caps.nBitDepthMinus8 = bitdepth_minus8[b_idx];

        cuda_ret = CuvidGetDecoderCaps (&decoder_caps);
        if (cuda_ret != CUDA_SUCCESS) {
          GST_INFO ("could not query %s decoder capability, ret %d",
              codec, cuda_ret);
          continue;
        } else if (!decoder_caps.bIsSupported) {
          GST_LOG ("%s bit-depth %d with chroma format %d is not supported",
              codec, bitdepth_minus8[b_idx] + 8, c_idx);
          continue;
        }

        if (min_width > decoder_caps.nMinWidth)
          min_width = decoder_caps.nMinWidth;
        if (min_height > decoder_caps.nMinHeight)
          min_height = decoder_caps.nMinHeight;
        if (max_width < decoder_caps.nMaxWidth)
          max_width = decoder_caps.nMaxWidth;
        if (max_height < decoder_caps.nMaxHeight)
          max_height = decoder_caps.nMaxHeight;

        GST_INFO ("%s bit-depth %d with chroma format %d [%d - %d] x [%d - %d]",
            codec, bitdepth_minus8[b_idx] + 8, c_idx, min_width, max_width,
            min_height, max_height);

        switch (chroma_list[c_idx]) {
          case cudaVideoChromaFormat_420:
            g_value_set_string (&format, "NV12");
            gst_value_list_append_value (&format_list, &format);
            break;
          default:
            break;
        }

        num_support++;
      }
    }

    if (num_support == 0) {
      GST_INFO ("device can not support %s", codec);
      goto cuda_free;
    }

    src_templ = gst_caps_new_simple ("video/x-raw",
        "width", GST_TYPE_INT_RANGE, min_width, max_width,
        "height", GST_TYPE_INT_RANGE, min_height, max_height,
        "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL);

    gst_caps_set_value (src_templ, "format", &format_list);

    /* OpenGL specific */
    gst_caps_set_features_simple (src_templ,
        gst_caps_features_from_string (GST_CAPS_FEATURE_MEMORY_GL_MEMORY));
    gst_caps_set_simple (src_templ,
        "texture-target", G_TYPE_STRING, "2D", NULL);

    sink_templ = gst_caps_from_string (sink_caps_string);
    gst_caps_set_simple (sink_templ,
        "width", GST_TYPE_INT_RANGE, min_width, max_width,
        "height", GST_TYPE_INT_RANGE, min_height, max_height, NULL);

    GST_DEBUG ("sink template caps %" GST_PTR_FORMAT, sink_templ);
    GST_DEBUG ("src template caps %" GST_PTR_FORMAT, src_templ);

    CuCtxPopCurrent (NULL);

  cuda_free:
    CuCtxDestroy (cuda_ctx);

    g_value_unset (&format_list);
    g_value_unset (&format);

    if (sink_templ && src_templ) {
      gst_nvdec_subclass_register (plugin, type, codec_type, codec, i, rank,
          sink_templ, src_templ);
    }

    gst_clear_caps (&sink_templ);
    gst_clear_caps (&src_templ);
  }

  return TRUE;
}

typedef struct
{
  cudaVideoCodec codec;
  const gchar *codec_name;
  const gchar *sink_caps_string;
} GstNvCodecMap;

const GstNvCodecMap codec_map[] = {
  {cudaVideoCodec_MPEG1, "mpegvideo",
      "video/mpeg, mpegversion = (int) 1, systemstream = (boolean) false"},
  {cudaVideoCodec_MPEG2, "mpeg2video",
      "video/mpeg, mpegversion = (int) 2, systemstream = (boolean) false"},
  {cudaVideoCodec_MPEG4, "mpeg4video",
      "video/mpeg, mpegversion = (int) 4, systemstream = (boolean) false"},
#if 0
  /* FIXME: need verification */
  {cudaVideoCodec_VC1, "vc1"},
#endif
  {cudaVideoCodec_H264, "h264",
      "video/x-h264, stream-format = (string) byte-stream"
        ", alignment = (string) au"},
  {cudaVideoCodec_JPEG, "jpeg", "image/jpeg"},
#if 0
  /* FIXME: need verification */
  {cudaVideoCodec_H264_SVC, "h264svc"},
  {cudaVideoCodec_H264_MVC, "h264mvc"},
#endif
  {cudaVideoCodec_HEVC, "h265",
      "video/x-h265, stream-format = (string) byte-stream"
        ", alignment = (string) au"},
  {cudaVideoCodec_VP8, "vp8", "video/x-vp8"},
  {cudaVideoCodec_VP9, "vp9", "video/x-vp9"}
};

gboolean
gst_nvdec_plugin_init (GstPlugin * plugin)
{
  gint i;
  CUresult cuda_ret;
  gint dev_count = 0;
  gboolean ret = TRUE;

  GST_DEBUG_CATEGORY_INIT (gst_nvdec_debug_category, "nvdec", 0,
      "Debug category for the nvdec element");

  if (!gst_cuvid_can_get_decoder_caps ()) {
    GstCaps *src_templ;

    GST_INFO ("Too old nvidia driver to query decoder capability");

    src_templ =
        gst_caps_from_string (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
        (GST_CAPS_FEATURE_MEMORY_GL_MEMORY, "NV12")
        ", texture-target=2D");

    for (i = 0; i < G_N_ELEMENTS (codec_map); i++) {
      GstCaps *sink_templ;

      sink_templ = gst_caps_from_string (codec_map[i].sink_caps_string);

      gst_nvdec_subclass_register (plugin, GST_TYPE_NVDEC, codec_map[i].codec,
          codec_map[i].codec_name, 0, GST_RANK_PRIMARY, sink_templ, src_templ);
    }

    return TRUE;
  }

  cuda_ret = CuInit (0);
  if (cuda_ret != CUDA_SUCCESS) {
    GST_ERROR ("Failed to initialize CUDA API");
    return TRUE;
  }

  cuda_ret = CuDeviceGetCount (&dev_count);
  if (cuda_ret != CUDA_SUCCESS || dev_count == 0) {
    GST_ERROR ("No CUDA devices detected");
    return TRUE;
  }

  for (i = 0; i < G_N_ELEMENTS (codec_map); i++) {
    ret &= gst_nvdec_register (plugin, GST_TYPE_NVDEC, codec_map[i].codec,
        codec_map[i].codec_name, codec_map[i].sink_caps_string,
        GST_RANK_PRIMARY, dev_count);
  }

  return ret;
}