text: /*
   * Intel MediaSDK QSV based HEVC encoder
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  
  #include <stdint.h>
  #include <sys/types.h>
  
  #include <mfx/mfxvideo.h>
  
  #include "libavutil/common.h"
  #include "libavutil/opt.h"
  
  #include "avcodec.h"
  #include "bytestream.h"
  #include "get_bits.h"
  #include "hevc.h"
  #include "h2645_parse.h"
  #include "internal.h"
  #include "qsv.h"
  #include "qsv_internal.h"
  #include "qsvenc.h"
  
  enum LoadPlugin {
      LOAD_PLUGIN_NONE,
      LOAD_PLUGIN_HEVC_SW,
      LOAD_PLUGIN_HEVC_HW,
  };
  
  typedef struct QSVHEVCEncContext {
      AVClass *class;
      QSVEncContext qsv;
      int load_plugin;
  } QSVHEVCEncContext;
  
  static int generate_fake_vps(QSVEncContext *q, AVCodecContext *avctx)
  {
      GetByteContext gbc;
      PutByteContext pbc;
  
      GetBitContext gb;
      H2645NAL sps_nal = { NULL };
      HEVCSPS sps = { 0 };
      HEVCVPS vps = { 0 };
      uint8_t vps_buf[128], vps_rbsp_buf[128];
      uint8_t *new_extradata;
      unsigned int sps_id;
      int ret, i, type, vps_size;
  
      if (!avctx->extradata_size) {
          av_log(avctx, AV_LOG_ERROR, "No extradata returned from libmfx\n");
          return AVERROR_UNKNOWN;
      }
  
      /* parse the SPS */
      ret = ff_h2645_extract_rbsp(avctx->extradata + 4, avctx->extradata_size - 4, &sps_nal, 1);
      if (ret < 0) {
          av_log(avctx, AV_LOG_ERROR, "Error unescaping the SPS buffer\n");
          return ret;
      }
  
      ret = init_get_bits8(&gb, sps_nal.data, sps_nal.size);
      if (ret < 0) {
          av_freep(&sps_nal.rbsp_buffer);
          return ret;
      }
  
      get_bits(&gb, 1);
      type = get_bits(&gb, 6);
      if (type != NAL_SPS) {
          av_log(avctx, AV_LOG_ERROR, "Unexpected NAL type in the extradata: %d\n",
                 type);
          av_freep(&sps_nal.rbsp_buffer);
          return AVERROR_INVALIDDATA;
      }
      get_bits(&gb, 9);
  
      ret = ff_hevc_parse_sps(&sps, &gb, &sps_id, 0, NULL, avctx);
      av_freep(&sps_nal.rbsp_buffer);
      if (ret < 0) {
          av_log(avctx, AV_LOG_ERROR, "Error parsing the SPS\n");
          return ret;
      }
  
      /* generate the VPS */
      vps.vps_max_layers     = 1;
      vps.vps_max_sub_layers = sps.max_sub_layers;
      memcpy(&vps.ptl, &sps.ptl, sizeof(vps.ptl));
      vps.vps_sub_layer_ordering_info_present_flag = 1;
      for (i = 0; i < MAX_SUB_LAYERS; i++) {
          vps.vps_max_dec_pic_buffering[i] = sps.temporal_layer[i].max_dec_pic_buffering;
          vps.vps_num_reorder_pics[i]      = sps.temporal_layer[i].num_reorder_pics;
          vps.vps_max_latency_increase[i]  = sps.temporal_layer[i].max_latency_increase;
      }
  
      vps.vps_num_layer_sets                  = 1;
      vps.vps_timing_info_present_flag        = sps.vui.vui_timing_info_present_flag;
      vps.vps_num_units_in_tick               = sps.vui.vui_num_units_in_tick;
      vps.vps_time_scale                      = sps.vui.vui_time_scale;
      vps.vps_poc_proportional_to_timing_flag = sps.vui.vui_poc_proportional_to_timing_flag;
      vps.vps_num_ticks_poc_diff_one          = sps.vui.vui_num_ticks_poc_diff_one_minus1 + 1;
  
      /* generate the encoded RBSP form of the VPS */
      ret = ff_hevc_encode_nal_vps(&vps, sps.vps_id, vps_rbsp_buf, sizeof(vps_rbsp_buf));
      if (ret < 0) {
          av_log(avctx, AV_LOG_ERROR, "Error writing the VPS\n");
          return ret;
      }
  
      /* escape and add the startcode */
      bytestream2_init(&gbc, vps_rbsp_buf, ret);
      bytestream2_init_writer(&pbc, vps_buf, sizeof(vps_buf));
  
      bytestream2_put_be32(&pbc, 1);              // startcode
      bytestream2_put_byte(&pbc, NAL_VPS << 1);   // NAL
      bytestream2_put_byte(&pbc, 1);              // header
  
      while (bytestream2_get_bytes_left(&gbc)) {
          uint32_t b = bytestream2_peek_be24(&gbc);
          if (b <= 3) {
              bytestream2_put_be24(&pbc, 3);
              bytestream2_skip(&gbc, 2);
          } else
              bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
      }
  
      vps_size = bytestream2_tell_p(&pbc);
      new_extradata = av_mallocz(vps_size + avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
      if (!new_extradata)
          return AVERROR(ENOMEM);
      memcpy(new_extradata, vps_buf, vps_size);
      memcpy(new_extradata + vps_size, avctx->extradata, avctx->extradata_size);
  
      av_freep(&avctx->extradata);
      avctx->extradata       = new_extradata;
      avctx->extradata_size += vps_size;
  
      return 0;
  }
  
  static av_cold int qsv_enc_init(AVCodecContext *avctx)
  {
      QSVHEVCEncContext *q = avctx->priv_data;
      int ret;
  
      if (q->load_plugin != LOAD_PLUGIN_NONE) {
          static const char *uid_hevcenc_sw = "2fca99749fdb49aeb121a5b63ef568f7";
          static const char *uid_hevcenc_hw = "6fadc791a0c2eb479ab6dcd5ea9da347";
  
          if (q->qsv.load_plugins[0]) {
              av_log(avctx, AV_LOG_WARNING,
                     "load_plugins is not empty, but load_plugin is not set to 'none'."
                     "The load_plugin value will be ignored.\n");
          } else {
              av_freep(&q->qsv.load_plugins);
  
              if (q->load_plugin == LOAD_PLUGIN_HEVC_SW)
                  q->qsv.load_plugins = av_strdup(uid_hevcenc_sw);
              else
                  q->qsv.load_plugins = av_strdup(uid_hevcenc_hw);
  
              if (!q->qsv.load_plugins)
                  return AVERROR(ENOMEM);
          }
      }
  
      ret = ff_qsv_enc_init(avctx, &q->qsv);
      if (ret < 0)
          return ret;
  
      ret = generate_fake_vps(&q->qsv, avctx);
      if (ret < 0) {
          ff_qsv_enc_close(avctx, &q->qsv);
          return ret;
      }
  
      return 0;
  }
  
  static int qsv_enc_frame(AVCodecContext *avctx, AVPacket *pkt,
                           const AVFrame *frame, int *got_packet)
  {
      QSVHEVCEncContext *q = avctx->priv_data;
  
      return ff_qsv_encode(avctx, &q->qsv, pkt, frame, got_packet);
  }
  
  static av_cold int qsv_enc_close(AVCodecContext *avctx)
  {
      QSVHEVCEncContext *q = avctx->priv_data;
  
      return ff_qsv_enc_close(avctx, &q->qsv);
  }
  
  #define OFFSET(x) offsetof(QSVHEVCEncContext, x)
  #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  static const AVOption options[] = {
      QSV_COMMON_OPTS
  
      { "load_plugin", "A user plugin to load in an internal session", OFFSET(load_plugin), AV_OPT_TYPE_INT, { .i64 = LOAD_PLUGIN_HEVC_SW }, LOAD_PLUGIN_NONE, LOAD_PLUGIN_HEVC_HW, VE, "load_plugin" },
      { "none",     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LOAD_PLUGIN_NONE },    0, 0, VE, "load_plugin" },
      { "hevc_sw",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LOAD_PLUGIN_HEVC_SW }, 0, 0, VE, "load_plugin" },
      { "hevc_hw",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = LOAD_PLUGIN_HEVC_HW }, 0, 0, VE, "load_plugin" },
  
      { "load_plugins", "A :-separate list of hexadecimal plugin UIDs to load in an internal session",
          OFFSET(qsv.load_plugins), AV_OPT_TYPE_STRING, { .str = "" }, 0, 0, VE },
  
      { "profile", NULL, OFFSET(qsv.profile), AV_OPT_TYPE_INT, { .i64 = MFX_PROFILE_UNKNOWN }, 0, INT_MAX, VE, "profile" },
      { "unknown", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_UNKNOWN      }, INT_MIN, INT_MAX,     VE, "profile" },
      { "main",    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_HEVC_MAIN    }, INT_MIN, INT_MAX,     VE, "profile" },
      { "main10",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_HEVC_MAIN10  }, INT_MIN, INT_MAX,     VE, "profile" },
      { "mainsp",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_HEVC_MAINSP  }, INT_MIN, INT_MAX,     VE, "profile" },
  
      { NULL },
  };
  
  static const AVClass class = {
      .class_name = "hevc_qsv encoder",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  static const AVCodecDefault qsv_enc_defaults[] = {
      { "b",         "1M"    },
      { "refs",      "0"     },
      // same as the x264 default
      { "g",         "248"   },
      { "bf",        "8"     },
  
      { "flags",     "+cgop" },
  #if FF_API_PRIVATE_OPT
      { "b_strategy", "-1"   },
  #endif
      { NULL },
  };
  
  AVCodec ff_hevc_qsv_encoder = {
      .name           = "hevc_qsv",
      .long_name      = NULL_IF_CONFIG_SMALL("HEVC (Intel Quick Sync Video acceleration)"),
      .priv_data_size = sizeof(QSVHEVCEncContext),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_HEVC,
      .init           = qsv_enc_init,
      .encode2        = qsv_enc_frame,
      .close          = qsv_enc_close,
      .capabilities   = AV_CODEC_CAP_DELAY,
      .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_NV12,
                                                      AV_PIX_FMT_QSV,
                                                      AV_PIX_FMT_NONE },
      .priv_class     = &class,
      .defaults       = qsv_enc_defaults,
      .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
  };
  