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
  25 /** Reconstruct bitstream intra_dc_vlc_thr */
  26 static int mpeg4_get_intra_dc_vlc_thr(MpegEncContext *s)
  27 {
  28     switch (s->intra_dc_threshold) {
  29     case 99: return 0;
  30     case 13: return 1;
  31     case 15: return 2;
  32     case 17: return 3;
  33     case 19: return 4;
  34     case 21: return 5;
  35     case 23: return 6;
  36     case 0:  return 7;
  37     }
  38     return 0;
  39 }
  40
  41 static int vaapi_mpeg4_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  42 {
  43     MpegEncContext * const s = avctx->priv_data;
  44     struct vaapi_context * const vactx = avctx->hwaccel_context;
  45     VAPictureParameterBufferMPEG4 *pic_param;
  46     VAIQMatrixBufferMPEG4 *iq_matrix;
  47     int i;
  48
  49     dprintf(avctx, "vaapi_mpeg4_start_frame()\n");
  50
  51     vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG4);
  52
  53     /* Fill in VAPictureParameterBufferMPEG4 */
  54     pic_param = ff_vaapi_alloc_picture(vactx, sizeof(VAPictureParameterBufferMPEG4));
  55     if (!pic_param)
  56         return -1;
  57     pic_param->vop_width                                = s->width;
  58     pic_param->vop_height                               = s->height;
  59     pic_param->forward_reference_picture                = 0xffffffff;
  60     pic_param->backward_reference_picture               = 0xffffffff;
  61     pic_param->vol_fields.value                         = 0; /* reset all bits */
  62     pic_param->vol_fields.bits.short_video_header       = avctx->codec->id == CODEC_ID_H263;
  63     pic_param->vol_fields.bits.chroma_format            = CHROMA_420;
  64     pic_param->vol_fields.bits.interlaced               = !s->progressive_sequence;
  65     pic_param->vol_fields.bits.obmc_disable             = 1;
  66     pic_param->vol_fields.bits.sprite_enable            = s->vol_sprite_usage;
  67     pic_param->vol_fields.bits.sprite_warping_accuracy  = s->sprite_warping_accuracy;
  68     pic_param->vol_fields.bits.quant_type               = s->mpeg_quant;
  69     pic_param->vol_fields.bits.quarter_sample           = s->quarter_sample;
  70     pic_param->vol_fields.bits.data_partitioned         = s->data_partitioning;
  71     pic_param->vol_fields.bits.reversible_vlc           = s->rvlc;
  72     pic_param->no_of_sprite_warping_points              = s->num_sprite_warping_points;
  73     for (i = 0; i < s->num_sprite_warping_points && i < 3; i++) {
  74         pic_param->sprite_trajectory_du[i]              = s->sprite_traj[i][0];
  75         pic_param->sprite_trajectory_dv[i]              = s->sprite_traj[i][1];
  76     }
  77     pic_param->quant_precision                          = s->quant_precision;
  78     pic_param->vop_fields.value                         = 0; /* reset all bits */
  79     pic_param->vop_fields.bits.vop_coding_type          = s->pict_type - FF_I_TYPE;
  80     pic_param->vop_fields.bits.backward_reference_vop_coding_type = s->pict_type == FF_B_TYPE ? s->next_picture.pict_type - FF_I_TYPE : 0;
  81     pic_param->vop_fields.bits.vop_rounding_type        = s->no_rounding;
  82     pic_param->vop_fields.bits.intra_dc_vlc_thr         = mpeg4_get_intra_dc_vlc_thr(s);
  83     pic_param->vop_fields.bits.top_field_first          = s->top_field_first;
  84     pic_param->vop_fields.bits.alternate_vertical_scan_flag = s->alternate_scan;
  85     pic_param->vop_fcode_forward                        = s->f_code;
  86     pic_param->vop_fcode_backward                       = s->b_code;
  87     pic_param->num_macroblocks_in_gob                   = s->mb_width * ff_h263_get_gob_height(s);
  88     pic_param->num_gobs_in_vop                          = (s->mb_width * s->mb_height) / pic_param->num_macroblocks_in_gob;
  89     pic_param->TRB                                      = s->pb_time;
  90     pic_param->TRD                                      = s->pp_time;
  91
  92     if (s->pict_type == FF_B_TYPE)
  93         pic_param->backward_reference_picture = ff_vaapi_get_surface(&s->next_picture);
  94     if (s->pict_type != FF_I_TYPE)
  95         pic_param->forward_reference_picture  = ff_vaapi_get_surface(&s->last_picture);
  96
  97     /* Fill in VAIQMatrixBufferMPEG4 */
  98     /* Only the first inverse quantisation method uses the weighthing matrices */
  99     if (pic_param->vol_fields.bits.quant_type) {
 100         iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG4));
 101         if (!iq_matrix)
 102             return -1;
 103         iq_matrix->load_intra_quant_mat         = 1;
 104         iq_matrix->load_non_intra_quant_mat     = 1;
 105
 106         for (i = 0; i < 64; i++) {
 107             int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
 108             iq_matrix->intra_quant_mat[i]       = s->intra_matrix[n];
 109             iq_matrix->non_intra_quant_mat[i]   = s->inter_matrix[n];
 110         }
 111     }
 112     return 0;
 113 }
 114
 115 static int vaapi_mpeg4_end_frame(AVCodecContext *avctx)
 116 {
 117     return ff_vaapi_common_end_frame(avctx->priv_data);
 118 }
 119
 120 static int vaapi_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 121 {
 122     MpegEncContext * const s = avctx->priv_data;
 123     VASliceParameterBufferMPEG4 *slice_param;
 124
 125     dprintf(avctx, "vaapi_mpeg4_decode_slice(): buffer %p, size %d\n", buffer, size);
 126
 127     /* video_plane_with_short_video_header() contains all GOBs
 128      * in-order, and this is what VA API (Intel backend) expects: only
 129      * a single slice param. So fake macroblock_number for FFmpeg so
 130      * that we don't call vaapi_mpeg4_decode_slice() again
 131      */
 132     if (avctx->codec->id == CODEC_ID_H263)
 133         size = s->gb.buffer_end - buffer;
 134
 135     /* Fill in VASliceParameterBufferMPEG4 */
 136     slice_param = (VASliceParameterBufferMPEG4 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
 137     if (!slice_param)
 138         return -1;
 139     slice_param->macroblock_offset      = get_bits_count(&s->gb) % 8;
 140     slice_param->macroblock_number      = s->mb_y * s->mb_width + s->mb_x;
 141     slice_param->quant_scale            = s->qscale;
 142
 143     if (avctx->codec->id == CODEC_ID_H263)
 144         s->mb_y = s->mb_height;
 145
 146     return 0;
 147 }
 148
 149 #if CONFIG_MPEG4_VAAPI_HWACCEL
 150 AVHWAccel mpeg4_vaapi_hwaccel = {
 151     .name           = "mpeg4_vaapi",
 152     .type           = CODEC_TYPE_VIDEO,
 153     .id             = CODEC_ID_MPEG4,
 154     .pix_fmt        = PIX_FMT_VAAPI_VLD,
 155     .capabilities   = 0,
 156     .start_frame    = vaapi_mpeg4_start_frame,
 157     .end_frame      = vaapi_mpeg4_end_frame,
 158     .decode_slice   = vaapi_mpeg4_decode_slice,
 159     .priv_data_size = 0,
 160 };
 161 #endif
 162
 163 #if CONFIG_H263_VAAPI_HWACCEL
 164 AVHWAccel h263_vaapi_hwaccel = {
 165     .name           = "h263_vaapi",
 166     .type           = CODEC_TYPE_VIDEO,
 167     .id             = CODEC_ID_H263,
 168     .pix_fmt        = PIX_FMT_VAAPI_VLD,
 169     .capabilities   = 0,
 170     .start_frame    = vaapi_mpeg4_start_frame,
 171     .end_frame      = vaapi_mpeg4_end_frame,
 172     .decode_slice   = vaapi_mpeg4_decode_slice,
 173     .priv_data_size = 0,
 174 };
 175 #endif