git.sesse.net Git - ffmpeg/blob - libavcodec/vaapi_mpeg4.c

   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     struct vaapi_context * const vactx = avctx->hwaccel_context;
  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     VASliceParameterBufferMPEG4 *slice_param;
 125
 126     ff_dlog(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
 127
 128     /* Fill in VASliceParameterBufferMPEG4 */
 129     slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
 130     if (!slice_param)
 131         return -1;
 132     slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;
 133     slice_param->macroblock_number      = 0;
 134     slice_param->quant_scale            = s->qscale;
 135
 136     return 0;
 137 }
 138
 139 #if CONFIG_MPEG4_VAAPI_HWACCEL
 140 AVHWAccel ff_mpeg4_vaapi_hwaccel = {
 141     .name           = "mpeg4_vaapi",
 142     .type           = AVMEDIA_TYPE_VIDEO,
 143     .id             = AV_CODEC_ID_MPEG4,
 144     .pix_fmt        = AV_PIX_FMT_VAAPI,
 145     .start_frame    = vaapi_mpeg4_start_frame,
 146     .end_frame      = ff_vaapi_mpeg_end_frame,
 147     .decode_slice   = vaapi_mpeg4_decode_slice,
 148 };
 149 #endif
 150
 151 #if CONFIG_H263_VAAPI_HWACCEL
 152 AVHWAccel ff_h263_vaapi_hwaccel = {
 153     .name           = "h263_vaapi",
 154     .type           = AVMEDIA_TYPE_VIDEO,
 155     .id             = AV_CODEC_ID_H263,
 156     .pix_fmt        = AV_PIX_FMT_VAAPI,
 157     .start_frame    = vaapi_mpeg4_start_frame,
 158     .end_frame      = ff_vaapi_mpeg_end_frame,
 159     .decode_slice   = vaapi_mpeg4_decode_slice,
 160 };
 161 #endif