Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * MPEG-2 HW decode acceleration through VA API
  3.  *
  4.  * Copyright (C) 2008-2009 Splitted-Desktop Systems
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "vaapi_internal.h"
  24.  
  25. /** Reconstruct bitstream f_code */
  26. static inline int mpeg2_get_f_code(MpegEncContext *s)
  27. {
  28.     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
  29.            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
  30. }
  31.  
  32. /** Determine frame start: first field for field picture or frame picture */
  33. static inline int mpeg2_get_is_frame_start(MpegEncContext *s)
  34. {
  35.     return s->first_field || s->picture_structure == PICT_FRAME;
  36. }
  37.  
  38. static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  39. {
  40.     struct MpegEncContext * const s = avctx->priv_data;
  41.     struct vaapi_context * const vactx = avctx->hwaccel_context;
  42.     VAPictureParameterBufferMPEG2 *pic_param;
  43.     VAIQMatrixBufferMPEG2 *iq_matrix;
  44.     int i;
  45.  
  46.     av_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
  47.  
  48.     vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
  49.  
  50.     /* Fill in VAPictureParameterBufferMPEG2 */
  51.     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
  52.     if (!pic_param)
  53.         return -1;
  54.     pic_param->horizontal_size                                  = s->width;
  55.     pic_param->vertical_size                                    = s->height;
  56.     pic_param->forward_reference_picture                        = VA_INVALID_ID;
  57.     pic_param->backward_reference_picture                       = VA_INVALID_ID;
  58.     pic_param->picture_coding_type                              = s->pict_type;
  59.     pic_param->f_code                                           = mpeg2_get_f_code(s);
  60.     pic_param->picture_coding_extension.value                   = 0; /* reset all bits */
  61.     pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
  62.     pic_param->picture_coding_extension.bits.picture_structure  = s->picture_structure;
  63.     pic_param->picture_coding_extension.bits.top_field_first    = s->top_field_first;
  64.     pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
  65.     pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
  66.     pic_param->picture_coding_extension.bits.q_scale_type       = s->q_scale_type;
  67.     pic_param->picture_coding_extension.bits.intra_vlc_format   = s->intra_vlc_format;
  68.     pic_param->picture_coding_extension.bits.alternate_scan     = s->alternate_scan;
  69.     pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
  70.     pic_param->picture_coding_extension.bits.progressive_frame  = s->progressive_frame;
  71.     pic_param->picture_coding_extension.bits.is_first_field     = mpeg2_get_is_frame_start(s);
  72.  
  73.     switch (s->pict_type) {
  74.     case AV_PICTURE_TYPE_B:
  75.         pic_param->backward_reference_picture = ff_vaapi_get_surface_id(&s->next_picture);
  76.         // fall-through
  77.     case AV_PICTURE_TYPE_P:
  78.         pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
  79.         break;
  80.     }
  81.  
  82.     /* Fill in VAIQMatrixBufferMPEG2 */
  83.     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
  84.     if (!iq_matrix)
  85.         return -1;
  86.     iq_matrix->load_intra_quantiser_matrix              = 1;
  87.     iq_matrix->load_non_intra_quantiser_matrix          = 1;
  88.     iq_matrix->load_chroma_intra_quantiser_matrix       = 1;
  89.     iq_matrix->load_chroma_non_intra_quantiser_matrix   = 1;
  90.  
  91.     for (i = 0; i < 64; i++) {
  92.         int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
  93.         iq_matrix->intra_quantiser_matrix[i]            = s->intra_matrix[n];
  94.         iq_matrix->non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
  95.         iq_matrix->chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
  96.         iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
  97.     }
  98.     return 0;
  99. }
  100.  
  101. static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  102. {
  103.     MpegEncContext * const s = avctx->priv_data;
  104.     VASliceParameterBufferMPEG2 *slice_param;
  105.     GetBitContext gb;
  106.     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
  107.  
  108.     av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
  109.  
  110.     /* Determine macroblock_offset */
  111.     init_get_bits(&gb, buffer, 8 * size);
  112.     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
  113.         return AVERROR_INVALIDDATA;
  114.     quantiser_scale_code = get_bits(&gb, 5);
  115.     intra_slice_flag = get_bits1(&gb);
  116.     if (intra_slice_flag) {
  117.         skip_bits(&gb, 8);
  118.         while (get_bits1(&gb) != 0)
  119.             skip_bits(&gb, 8);
  120.     }
  121.     macroblock_offset = get_bits_count(&gb);
  122.  
  123.     /* Fill in VASliceParameterBufferMPEG2 */
  124.     slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
  125.     if (!slice_param)
  126.         return -1;
  127.     slice_param->macroblock_offset              = macroblock_offset;
  128.     slice_param->slice_horizontal_position      = s->mb_x;
  129.     slice_param->slice_vertical_position        = s->mb_y >> (s->picture_structure != PICT_FRAME);
  130.     slice_param->quantiser_scale_code           = quantiser_scale_code;
  131.     slice_param->intra_slice_flag               = intra_slice_flag;
  132.     return 0;
  133. }
  134.  
  135. AVHWAccel ff_mpeg2_vaapi_hwaccel = {
  136.     .name           = "mpeg2_vaapi",
  137.     .type           = AVMEDIA_TYPE_VIDEO,
  138.     .id             = AV_CODEC_ID_MPEG2VIDEO,
  139.     .pix_fmt        = AV_PIX_FMT_VAAPI_VLD,
  140.     .start_frame    = vaapi_mpeg2_start_frame,
  141.     .end_frame      = ff_vaapi_mpeg_end_frame,
  142.     .decode_slice   = vaapi_mpeg2_decode_slice,
  143. };
  144.