/*
  * 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 <va/va.h>
 #include <va/va_dec_jpeg.h>
 
 #include "hwaccel.h"
 #include "vaapi_decode.h"
 #include "mjpegdec.h"
 
 static int vaapi_mjpeg_start_frame(AVCodecContext          *avctx,
                                    av_unused const uint8_t *buffer,
                                    av_unused uint32_t       size)
 {
     const MJpegDecodeContext *s = avctx->priv_data;
     VAAPIDecodePicture *pic = s->hwaccel_picture_private;
     VAPictureParameterBufferJPEGBaseline pp;
     int err, i;
 
     pic->output_surface = ff_vaapi_get_surface_id(s->picture_ptr);
 
     pp = (VAPictureParameterBufferJPEGBaseline) {
         .picture_width  = avctx->width,
         .picture_height = avctx->height,
 
         .num_components = s->nb_components,
     };
 
     for (i = 0; i < s->nb_components; i++) {
         pp.components[i].component_id             = s->component_id[i];
         pp.components[i].h_sampling_factor        = s->h_count[i];
         pp.components[i].v_sampling_factor        = s->v_count[i];
         pp.components[i].quantiser_table_selector = s->quant_index[i];
     }
 
     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                             VAPictureParameterBufferType,
                                             &pp, sizeof(pp));
     if (err < 0)
         goto fail;
 
     return 0;
 
 fail:
     ff_vaapi_decode_cancel(avctx, pic);
     return err;
 }
 
 static int vaapi_mjpeg_end_frame(AVCodecContext *avctx)
 {
     const MJpegDecodeContext *s = avctx->priv_data;
     VAAPIDecodePicture *pic = s->hwaccel_picture_private;
 
     return ff_vaapi_decode_issue(avctx, pic);
 }
 
 static int vaapi_mjpeg_decode_slice(AVCodecContext *avctx,
                                     const uint8_t  *buffer,
                                     uint32_t        size)
 {
     const MJpegDecodeContext *s = avctx->priv_data;
     VAAPIDecodePicture *pic = s->hwaccel_picture_private;
     VAHuffmanTableBufferJPEGBaseline huff;
     VAIQMatrixBufferJPEGBaseline quant;
     VASliceParameterBufferJPEGBaseline sp;
     int err, i, j;
 
     memset(&huff, 0, sizeof(huff));
     for (i = 0; i < 2; i++) {
         huff.load_huffman_table[i] = 1;
         for (j = 0; j < 16; j++)
             huff.huffman_table[i].num_dc_codes[j] = s->raw_huffman_lengths[0][i][j];
         for (j = 0; j < 12; j++)
             huff.huffman_table[i].dc_values[j] = s->raw_huffman_values[0][i][j];
         for (j = 0; j < 16; j++)
             huff.huffman_table[i].num_ac_codes[j] = s->raw_huffman_lengths[1][i][j];
         for (j = 0; j < 162; j++)
             huff.huffman_table[i].ac_values[j] = s->raw_huffman_values[1][i][j];
     }
 
     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                             VAHuffmanTableBufferType,
                                             &huff, sizeof(huff));
     if (err < 0)
         goto fail;
 
     memset(&quant, 0, sizeof(quant));
     for (i = 0; i < 4; i++) {
         quant.load_quantiser_table[i] = 1;
         for (j = 0; j < 64; j++)
             quant.quantiser_table[i][j] = s->quant_matrixes[i][j];
     }
 
     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
                                             VAIQMatrixBufferType,
                                             &quant, sizeof(quant));
     if (err < 0)
         goto fail;
 
     sp = (VASliceParameterBufferJPEGBaseline) {
         .slice_data_size   = size,
         .slice_data_offset = 0,
         .slice_data_flag   = VA_SLICE_DATA_FLAG_ALL,
 
         .slice_horizontal_position = 0,
         .slice_vertical_position   = 0,
 
         .restart_interval          = s->restart_interval,
         .num_mcus                  = s->mb_width * s->mb_height,
     };
 
     sp.num_components = s->nb_components;
     for (i = 0; i < s->nb_components; i++) {
         sp.components[i].component_selector = s->component_id[s->comp_index[i]];
         sp.components[i].dc_table_selector  = s->dc_index[i];
         sp.components[i].ac_table_selector  = s->ac_index[i];
     }
 
     err = ff_vaapi_decode_make_slice_buffer(avctx, pic, &sp, sizeof(sp), buffer, size);
     if (err)
         goto fail;
 
     return 0;
 
 fail:
     ff_vaapi_decode_cancel(avctx, pic);
     return err;
 }
 
 const AVHWAccel ff_mjpeg_vaapi_hwaccel = {
     .name                 = "mjpeg_vaapi",
     .type                 = AVMEDIA_TYPE_VIDEO,
     .id                   = AV_CODEC_ID_MJPEG,
     .pix_fmt              = AV_PIX_FMT_VAAPI,
     .start_frame          = &vaapi_mjpeg_start_frame,
     .end_frame            = &vaapi_mjpeg_end_frame,
     .decode_slice         = &vaapi_mjpeg_decode_slice,
     .frame_priv_data_size = sizeof(VAAPIDecodePicture),
     .init                 = &ff_vaapi_decode_init,
     .uninit               = &ff_vaapi_decode_uninit,
     .frame_params         = &ff_vaapi_common_frame_params,
     .priv_data_size       = sizeof(VAAPIDecodeContext),
     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
 };