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  1. /*
  2.  * MPEG-4 / H.263 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. #include "internal.h"
  25. #include "h263.h"
  26. #include "mpeg4video.h"
  27.  
  28. /** Reconstruct bitstream intra_dc_vlc_thr */
  29. static int mpeg4_get_intra_dc_vlc_thr(Mpeg4DecContext *s)
  30. {
  31.     switch (s->intra_dc_threshold) {
  32.     case 99: return 0;
  33.     case 13: return 1;
  34.     case 15: return 2;
  35.     case 17: return 3;
  36.     case 19: return 4;
  37.     case 21: return 5;
  38.     case 23: return 6;
  39.     case 0:  return 7;
  40.     }
  41.     return 0;
  42. }
  43.  
  44. static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  45. {
  46.     Mpeg4DecContext *ctx = avctx->priv_data;
  47.     MpegEncContext * const s = &ctx->m;
  48.     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
  49.     VAPictureParameterBufferMPEG4 *pic_param;
  50.     VAIQMatrixBufferMPEG4 *iq_matrix;
  51.     int i;
  52.  
  53.     ff_dlog(avctx, "vaapi_mpeg4_start_frame()\n");
  54.  
  55.     vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);
  56.  
  57.     /* Fill in VAPictureParameterBufferMPEG4 */
  58.     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG4));
  59.     if (!pic_param)
  60.         return -1;
  61.     pic_param->vop_width                                = s->width;
  62.     pic_param->vop_height                               = s->height;
  63.     pic_param->forward_reference_picture                = VA_INVALID_ID;
  64.     pic_param->backward_reference_picture               = VA_INVALID_ID;
  65.     pic_param->vol_fields.value                         = 0; /* reset all bits */
  66.     pic_param->vol_fields.bits.short_video_header       = avctx->codec->id == AV_CODEC_ID_H263;
  67.     pic_param->vol_fields.bits.chroma_format            = CHROMA_420;
  68.     pic_param->vol_fields.bits.interlaced               = !s->progressive_sequence;
  69.     pic_param->vol_fields.bits.obmc_disable             = 1;
  70.     pic_param->vol_fields.bits.sprite_enable            = ctx->vol_sprite_usage;
  71.     pic_param->vol_fields.bits.sprite_warping_accuracy  = s->sprite_warping_accuracy;
  72.     pic_param->vol_fields.bits.quant_type               = s->mpeg_quant;
  73.     pic_param->vol_fields.bits.quarter_sample           = s->quarter_sample;
  74.     pic_param->vol_fields.bits.data_partitioned         = s->data_partitioning;
  75.     pic_param->vol_fields.bits.reversible_vlc           = ctx->rvlc;
  76.     pic_param->vol_fields.bits.resync_marker_disable    = !ctx->resync_marker;
  77.     pic_param->no_of_sprite_warping_points              = ctx->num_sprite_warping_points;
  78.     for (i = 0; i < ctx->num_sprite_warping_points && i < 3; i++) {
  79.         pic_param->sprite_trajectory_du[i]              = ctx->sprite_traj[i][0];
  80.         pic_param->sprite_trajectory_dv[i]              = ctx->sprite_traj[i][1];
  81.     }
  82.     pic_param->quant_precision                          = s->quant_precision;
  83.     pic_param->vop_fields.value                         = 0; /* reset all bits */
  84.     pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - AV_PICTURE_TYPE_I;
  85.     pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == AV_PICTURE_TYPE_B ? s->next_picture.f->pict_type - AV_PICTURE_TYPE_I : 0;
  86.     pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;
  87.     pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(ctx);
  88.     pic_param->vop_fields.bits.top_field_first          = s->top_field_first;
  89.     pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
  90.     pic_param->vop_fcode_forward                        = s->f_code;
  91.     pic_param->vop_fcode_backward                       = s->b_code;
  92.     pic_param->vop_time_increment_resolution            = avctx->framerate.num;
  93.     pic_param->num_macroblocks_in_gob                   = s->mb_width * H263_GOB_HEIGHT(s->height);
  94.     pic_param->num_gobs_in_vop                          = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;
  95.     pic_param->TRB                                      = s->pb_time;
  96.     pic_param->TRD                                      = s->pp_time;
  97.  
  98.     if (s->pict_type == AV_PICTURE_TYPE_B)
  99.         pic_param->backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
  100.     if (s->pict_type != AV_PICTURE_TYPE_I)
  101.         pic_param->forward_reference_picture  = ff_vaapi_get_surface_id(s->last_picture.f);
  102.  
  103.     /* Fill in VAIQMatrixBufferMPEG4 */
  104.     /* Only the first inverse quantisation method uses the weighting matrices */
  105.     if (pic_param->vol_fields.bits.quant_type) {
  106.         iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));
  107.         if (!iq_matrix)
  108.             return -1;
  109.         iq_matrix->load_intra_quant_mat         = 1;
  110.         iq_matrix->load_non_intra_quant_mat     = 1;
  111.  
  112.         for (i = 0; i < 64; i++) {
  113.             int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
  114.             iq_matrix->intra_quant_mat[i]       = s->intra_matrix[n];
  115.             iq_matrix->non_intra_quant_mat[i]   = s->inter_matrix[n];
  116.         }
  117.     }
  118.     return 0;
  119. }
  120.  
  121. static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  122. {
  123.     MpegEncContext * const s = avctx->priv_data;
  124.     FFVAContext * const vactx = ff_vaapi_get_context(avctx);
  125.     VASliceParameterBufferMPEG4 *slice_param;
  126.  
  127.     ff_dlog(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
  128.  
  129.     /* Fill in VASliceParameterBufferMPEG4 */
  130.     slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(vactx, buffer, size);
  131.     if (!slice_param)
  132.         return -1;
  133.     slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;
  134.     slice_param->macroblock_number      = 0;
  135.     slice_param->quant_scale            = s->qscale;
  136.  
  137.     return 0;
  138. }
  139.  
  140. #if CONFIG_MPEG4_VAAPI_HWACCEL
  141. AVHWAccel ff_mpeg4_vaapi_hwaccel = {
  142.     .name           = "mpeg4_vaapi",
  143.     .type           = AVMEDIA_TYPE_VIDEO,
  144.     .id             = AV_CODEC_ID_MPEG4,
  145.     .pix_fmt        = AV_PIX_FMT_VAAPI,
  146.     .start_frame    = vaapi_mpeg4_start_frame,
  147.     .end_frame      = ff_vaapi_mpeg_end_frame,
  148.     .decode_slice   = vaapi_mpeg4_decode_slice,
  149.     .init           = ff_vaapi_context_init,
  150.     .uninit         = ff_vaapi_context_fini,
  151.     .priv_data_size = sizeof(FFVAContext),
  152. };
  153. #endif
  154.  
  155. #if CONFIG_H263_VAAPI_HWACCEL
  156. AVHWAccel ff_h263_vaapi_hwaccel = {
  157.     .name           = "h263_vaapi",
  158.     .type           = AVMEDIA_TYPE_VIDEO,
  159.     .id             = AV_CODEC_ID_H263,
  160.     .pix_fmt        = AV_PIX_FMT_VAAPI,
  161.     .start_frame    = vaapi_mpeg4_start_frame,
  162.     .end_frame      = ff_vaapi_mpeg_end_frame,
  163.     .decode_slice   = vaapi_mpeg4_decode_slice,
  164.     .init           = ff_vaapi_context_init,
  165.     .uninit         = ff_vaapi_context_fini,
  166.     .priv_data_size = sizeof(FFVAContext),
  167. };
  168. #endif
  169.