/**************************************************************************
 *
 * Copyright 2018 Advanced Micro Devices, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include <stdio.h>

#include "pipe/p_video_codec.h"

#include "util/u_video.h"
#include "util/u_memory.h"

#include "vl/vl_video_buffer.h"

#include "radeonsi/si_pipe.h"
#include "radeon_video.h"
#include "radeon_uvd_enc.h"

#define UVD_HEVC_LEVEL_1       30
#define UVD_HEVC_LEVEL_2       60
#define UVD_HEVC_LEVEL_2_1     63
#define UVD_HEVC_LEVEL_3       90
#define UVD_HEVC_LEVEL_3_1     93
#define UVD_HEVC_LEVEL_4       120
#define UVD_HEVC_LEVEL_4_1     123
#define UVD_HEVC_LEVEL_5       150
#define UVD_HEVC_LEVEL_5_1     153
#define UVD_HEVC_LEVEL_5_2     156
#define UVD_HEVC_LEVEL_6       180
#define UVD_HEVC_LEVEL_6_1     183
#define UVD_HEVC_LEVEL_6_2     186

static void
radeon_uvd_enc_get_param(struct radeon_uvd_encoder *enc,
                         struct pipe_h265_enc_picture_desc *pic)
{
   enc->enc_pic.picture_type = pic->picture_type;
   enc->enc_pic.frame_num = pic->frame_num;
   enc->enc_pic.pic_order_cnt = pic->pic_order_cnt;
   enc->enc_pic.pic_order_cnt_type = pic->pic_order_cnt_type;
   enc->enc_pic.not_referenced = pic->not_referenced;
   enc->enc_pic.is_iframe =
      (pic->picture_type == PIPE_H265_ENC_PICTURE_TYPE_IDR)
      || (pic->picture_type == PIPE_H265_ENC_PICTURE_TYPE_I);
   enc->enc_pic.crop_left = 0;
   enc->enc_pic.crop_right =
      (align(enc->base.width, 16) - enc->base.width) / 2;
   enc->enc_pic.crop_top = 0;
   enc->enc_pic.crop_bottom =
      (align(enc->base.height, 16) - enc->base.height) / 2;
   enc->enc_pic.general_tier_flag = pic->seq.general_tier_flag;
   enc->enc_pic.general_profile_idc = pic->seq.general_profile_idc;
   enc->enc_pic.general_level_idc = pic->seq.general_level_idc;
   enc->enc_pic.max_poc = pic->seq.intra_period;
   enc->enc_pic.log2_max_poc = 0;
   for (int i = enc->enc_pic.max_poc; i != 0; enc->enc_pic.log2_max_poc++)
      i = (i >> 1);
   enc->enc_pic.chroma_format_idc = pic->seq.chroma_format_idc;
   enc->enc_pic.pic_width_in_luma_samples =
      pic->seq.pic_width_in_luma_samples;
   enc->enc_pic.pic_height_in_luma_samples =
      pic->seq.pic_height_in_luma_samples;
   enc->enc_pic.log2_diff_max_min_luma_coding_block_size =
      pic->seq.log2_diff_max_min_luma_coding_block_size;
   enc->enc_pic.log2_min_transform_block_size_minus2 =
      pic->seq.log2_min_transform_block_size_minus2;
   enc->enc_pic.log2_diff_max_min_transform_block_size =
      pic->seq.log2_diff_max_min_transform_block_size;
   enc->enc_pic.max_transform_hierarchy_depth_inter =
      pic->seq.max_transform_hierarchy_depth_inter;
   enc->enc_pic.max_transform_hierarchy_depth_intra =
      pic->seq.max_transform_hierarchy_depth_intra;
   enc->enc_pic.log2_parallel_merge_level_minus2 =
      pic->pic.log2_parallel_merge_level_minus2;
   enc->enc_pic.bit_depth_luma_minus8 = pic->seq.bit_depth_luma_minus8;
   enc->enc_pic.bit_depth_chroma_minus8 = pic->seq.bit_depth_chroma_minus8;
   enc->enc_pic.nal_unit_type = pic->pic.nal_unit_type;
   enc->enc_pic.max_num_merge_cand = pic->slice.max_num_merge_cand;
   enc->enc_pic.sample_adaptive_offset_enabled_flag =
      pic->seq.sample_adaptive_offset_enabled_flag;
   enc->enc_pic.pcm_enabled_flag = 0;   /*HW not support PCM */
   enc->enc_pic.sps_temporal_mvp_enabled_flag =
      pic->seq.sps_temporal_mvp_enabled_flag;
}

static void
flush(struct radeon_uvd_encoder *enc)
{
   enc->ws->cs_flush(enc->cs, PIPE_FLUSH_ASYNC, NULL);
}

static void
radeon_uvd_enc_flush(struct pipe_video_codec *encoder)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;
   flush(enc);
}

static void
radeon_uvd_enc_cs_flush(void *ctx, unsigned flags,
                        struct pipe_fence_handle **fence)
{
   // just ignored
}

static unsigned
get_cpb_num(struct radeon_uvd_encoder *enc)
{
   unsigned w = align(enc->base.width, 16) / 16;
   unsigned h = align(enc->base.height, 16) / 16;
   unsigned dpb;

   switch (enc->base.level) {
   case UVD_HEVC_LEVEL_1:
      dpb = 36864;
      break;

   case UVD_HEVC_LEVEL_2:
      dpb = 122880;
      break;

   case UVD_HEVC_LEVEL_2_1:
      dpb = 245760;
      break;

   case UVD_HEVC_LEVEL_3:
      dpb = 552960;
      break;

   case UVD_HEVC_LEVEL_3_1:
      dpb = 983040;
      break;

   case UVD_HEVC_LEVEL_4:
   case UVD_HEVC_LEVEL_4_1:
      dpb = 2228224;
      break;

   case UVD_HEVC_LEVEL_5:
   case UVD_HEVC_LEVEL_5_1:
   case UVD_HEVC_LEVEL_5_2:
      dpb = 8912896;
      break;

   case UVD_HEVC_LEVEL_6:
   case UVD_HEVC_LEVEL_6_1:
   case UVD_HEVC_LEVEL_6_2:
   default:
      dpb = 35651584;
      break;
   }

   return MIN2(dpb / (w * h), 16);
}

static void
radeon_uvd_enc_begin_frame(struct pipe_video_codec *encoder,
                           struct pipe_video_buffer *source,
                           struct pipe_picture_desc *picture)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;
   struct vl_video_buffer *vid_buf = (struct vl_video_buffer *) source;

   radeon_uvd_enc_get_param(enc,
                            (struct pipe_h265_enc_picture_desc *) picture);

   enc->get_buffer(vid_buf->resources[0], &enc->handle, &enc->luma);
   enc->get_buffer(vid_buf->resources[1], NULL, &enc->chroma);

   enc->need_feedback = false;

   if (!enc->stream_handle) {
      struct rvid_buffer fb;
      enc->stream_handle = si_vid_alloc_stream_handle();
      enc->si = CALLOC_STRUCT(rvid_buffer);
      si_vid_create_buffer(enc->screen, enc->si, 128 * 1024,
                           PIPE_USAGE_STAGING);
      si_vid_create_buffer(enc->screen, &fb, 4096, PIPE_USAGE_STAGING);
      enc->fb = &fb;
      enc->begin(enc, picture);
      flush(enc);
      si_vid_destroy_buffer(&fb);
   }
}

static void
radeon_uvd_enc_encode_bitstream(struct pipe_video_codec *encoder,
                                struct pipe_video_buffer *source,
                                struct pipe_resource *destination, void **fb)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;
   enc->get_buffer(destination, &enc->bs_handle, NULL);
   enc->bs_size = destination->width0;

   *fb = enc->fb = CALLOC_STRUCT(rvid_buffer);

   if (!si_vid_create_buffer(enc->screen, enc->fb, 4096, PIPE_USAGE_STAGING)) {
      RVID_ERR("Can't create feedback buffer.\n");
      return;
   }

   enc->need_feedback = true;
   enc->encode(enc);
}

static void
radeon_uvd_enc_end_frame(struct pipe_video_codec *encoder,
                         struct pipe_video_buffer *source,
                         struct pipe_picture_desc *picture)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;
   flush(enc);
}

static void
radeon_uvd_enc_destroy(struct pipe_video_codec *encoder)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;

   if (enc->stream_handle) {
      struct rvid_buffer fb;
      enc->need_feedback = false;
      si_vid_create_buffer(enc->screen, &fb, 512, PIPE_USAGE_STAGING);
      enc->fb = &fb;
      enc->destroy(enc);
      flush(enc);
      si_vid_destroy_buffer(&fb);
   }

   si_vid_destroy_buffer(&enc->cpb);
   enc->ws->cs_destroy(enc->cs);
   FREE(enc);
}

static void
radeon_uvd_enc_get_feedback(struct pipe_video_codec *encoder,
                            void *feedback, unsigned *size)
{
   struct radeon_uvd_encoder *enc = (struct radeon_uvd_encoder *) encoder;
   struct rvid_buffer *fb = feedback;

   if (NULL != size) {
      radeon_uvd_enc_feedback_t *fb_data =
         (radeon_uvd_enc_feedback_t *) enc->ws->buffer_map(
               fb->res->buf, enc->cs,
               PIPE_TRANSFER_READ_WRITE | RADEON_TRANSFER_TEMPORARY);

      if (!fb_data->status)
         *size = fb_data->bitstream_size;
      else
         *size = 0;
      enc->ws->buffer_unmap(fb->res->buf);
   }

   si_vid_destroy_buffer(fb);
   FREE(fb);
}

struct pipe_video_codec *
radeon_uvd_create_encoder(struct pipe_context *context,
                          const struct pipe_video_codec *templ,
                          struct radeon_winsys *ws,
                          radeon_uvd_enc_get_buffer get_buffer)
{
   struct si_screen *sscreen = (struct si_screen *) context->screen;
   struct si_context *sctx = (struct si_context *) context;
   struct radeon_uvd_encoder *enc;
   struct pipe_video_buffer *tmp_buf, templat = { };
   struct radeon_surf *tmp_surf;
   unsigned cpb_size;

   if (!si_radeon_uvd_enc_supported(sscreen)) {
      RVID_ERR("Unsupported UVD ENC fw version loaded!\n");
      return NULL;
   }

   enc = CALLOC_STRUCT(radeon_uvd_encoder);

   if (!enc)
      return NULL;

   enc->base = *templ;
   enc->base.context = context;
   enc->base.destroy = radeon_uvd_enc_destroy;
   enc->base.begin_frame = radeon_uvd_enc_begin_frame;
   enc->base.encode_bitstream = radeon_uvd_enc_encode_bitstream;
   enc->base.end_frame = radeon_uvd_enc_end_frame;
   enc->base.flush = radeon_uvd_enc_flush;
   enc->base.get_feedback = radeon_uvd_enc_get_feedback;
   enc->get_buffer = get_buffer;
   enc->bits_in_shifter = 0;
   enc->screen = context->screen;
   enc->ws = ws;
   enc->cs =
      ws->cs_create(sctx->ctx, RING_UVD_ENC, radeon_uvd_enc_cs_flush, enc, false);

   if (!enc->cs) {
      RVID_ERR("Can't get command submission context.\n");
      goto error;
   }

   struct rvid_buffer si;
   si_vid_create_buffer(enc->screen, &si, 128 * 1024, PIPE_USAGE_STAGING);
   enc->si = &si;

   templat.buffer_format = PIPE_FORMAT_NV12;
   templat.chroma_format = PIPE_VIDEO_CHROMA_FORMAT_420;
   templat.width = enc->base.width;
   templat.height = enc->base.height;
   templat.interlaced = false;

   if (!(tmp_buf = context->create_video_buffer(context, &templat))) {
      RVID_ERR("Can't create video buffer.\n");
      goto error;
   }

   enc->cpb_num = get_cpb_num(enc);

   if (!enc->cpb_num)
      goto error;

   get_buffer(((struct vl_video_buffer *) tmp_buf)->resources[0], NULL,
              &tmp_surf);

   cpb_size = (sscreen->info.chip_class < GFX9) ?
      align(tmp_surf->u.legacy.level[0].nblk_x * tmp_surf->bpe, 128) *
      align(tmp_surf->u.legacy.level[0].nblk_y, 32) :
      align(tmp_surf->u.gfx9.surf_pitch * tmp_surf->bpe, 256) *
      align(tmp_surf->u.gfx9.surf_height, 32);

   cpb_size = cpb_size * 3 / 2;
   cpb_size = cpb_size * enc->cpb_num;
   tmp_buf->destroy(tmp_buf);

   if (!si_vid_create_buffer
       (enc->screen, &enc->cpb, cpb_size, PIPE_USAGE_DEFAULT)) {
      RVID_ERR("Can't create CPB buffer.\n");
      goto error;
   }

   radeon_uvd_enc_1_1_init(enc);

   return &enc->base;

 error:
   if (enc->cs)
      enc->ws->cs_destroy(enc->cs);

   si_vid_destroy_buffer(&enc->cpb);

   FREE(enc);
   return NULL;
}

bool
si_radeon_uvd_enc_supported(struct si_screen * sscreen)
{
   return (sscreen->info.uvd_enc_supported);
}