git.sesse.net Git - ffmpeg/blob - libavcodec/vaapi_mpeg2.c

   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 "mpegutils.h"
  24 #include "mpegvideo.h"
  25 #include "internal.h"
  26 #include "vaapi_decode.h"
  27
  28 /** Reconstruct bitstream f_code */
  29 static inline int mpeg2_get_f_code(const MpegEncContext *s)
  30 {
  31     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
  32            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
  33 }
  34
  35 /** Determine frame start: first field for field picture or frame picture */
  36 static inline int mpeg2_get_is_frame_start(const MpegEncContext *s)
  37 {
  38     return s->first_field || s->picture_structure == PICT_FRAME;
  39 }
  40
  41 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  42 {
  43     const MpegEncContext *s = avctx->priv_data;
  44     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
  45     VAPictureParameterBufferMPEG2 pic_param;
  46     VAIQMatrixBufferMPEG2 iq_matrix;
  47     int i, err;
  48
  49     pic->output_surface = ff_vaapi_get_surface_id(s->current_picture_ptr->f);
  50
  51     pic_param = (VAPictureParameterBufferMPEG2) {
  52         .horizontal_size                 = s->width,
  53         .vertical_size                   = s->height,
  54         .forward_reference_picture       = VA_INVALID_ID,
  55         .backward_reference_picture      = VA_INVALID_ID,
  56         .picture_coding_type             = s->pict_type,
  57         .f_code                          = mpeg2_get_f_code(s),
  58         .picture_coding_extension.bits = {
  59             .intra_dc_precision          = s->intra_dc_precision,
  60             .picture_structure           = s->picture_structure,
  61             .top_field_first             = s->top_field_first,
  62             .frame_pred_frame_dct        = s->frame_pred_frame_dct,
  63             .concealment_motion_vectors  = s->concealment_motion_vectors,
  64             .q_scale_type                = s->q_scale_type,
  65             .intra_vlc_format            = s->intra_vlc_format,
  66             .alternate_scan              = s->alternate_scan,
  67             .repeat_first_field          = s->repeat_first_field,
  68             .progressive_frame           = s->progressive_frame,
  69             .is_first_field              = mpeg2_get_is_frame_start(s),
  70         },
  71     };
  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.f);
  76         // fall-through
  77     case AV_PICTURE_TYPE_P:
  78         pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
  79         break;
  80     }
  81
  82     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
  83                                             VAPictureParameterBufferType,
  84                                             &pic_param, sizeof(pic_param));
  85     if (err < 0)
  86         goto fail;
  87
  88     iq_matrix.load_intra_quantiser_matrix              = 1;
  89     iq_matrix.load_non_intra_quantiser_matrix          = 1;
  90     iq_matrix.load_chroma_intra_quantiser_matrix       = 1;
  91     iq_matrix.load_chroma_non_intra_quantiser_matrix   = 1;
  92
  93     for (i = 0; i < 64; i++) {
  94         int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
  95         iq_matrix.intra_quantiser_matrix[i]            = s->intra_matrix[n];
  96         iq_matrix.non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
  97         iq_matrix.chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
  98         iq_matrix.chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
  99     }
 100
 101     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
 102                                             VAIQMatrixBufferType,
 103                                             &iq_matrix, sizeof(iq_matrix));
 104     if (err < 0)
 105         goto fail;
 106
 107     return 0;
 108
 109 fail:
 110     ff_vaapi_decode_cancel(avctx, pic);
 111     return err;
 112 }
 113
 114 static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
 115 {
 116     MpegEncContext     *s   = avctx->priv_data;
 117     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
 118     int ret;
 119
 120     ret = ff_vaapi_decode_issue(avctx, pic);
 121     if (ret < 0)
 122         goto fail;
 123
 124     ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);
 125
 126 fail:
 127     return ret;
 128 }
 129
 130 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 131 {
 132     const MpegEncContext *s = avctx->priv_data;
 133     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
 134     VASliceParameterBufferMPEG2 slice_param;
 135     GetBitContext gb;
 136     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
 137     int err;
 138
 139     /* Determine macroblock_offset */
 140     init_get_bits(&gb, buffer, 8 * size);
 141     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
 142         return AVERROR_INVALIDDATA;
 143     quantiser_scale_code = get_bits(&gb, 5);
 144     intra_slice_flag = get_bits1(&gb);
 145     if (intra_slice_flag) {
 146         skip_bits(&gb, 8);
 147         if (skip_1stop_8data_bits(&gb) < 0)
 148             return AVERROR_INVALIDDATA;
 149     }
 150     macroblock_offset = get_bits_count(&gb);
 151
 152     slice_param = (VASliceParameterBufferMPEG2) {
 153         .slice_data_size            = size,
 154         .slice_data_offset          = 0,
 155         .slice_data_flag            = VA_SLICE_DATA_FLAG_ALL,
 156         .macroblock_offset          = macroblock_offset,
 157         .slice_horizontal_position  = s->mb_x,
 158         .slice_vertical_position    = s->mb_y >> (s->picture_structure != PICT_FRAME),
 159         .quantiser_scale_code       = quantiser_scale_code,
 160         .intra_slice_flag           = intra_slice_flag,
 161     };
 162
 163     err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
 164                                             &slice_param, sizeof(slice_param),
 165                                             buffer, size);
 166     if (err < 0) {
 167         ff_vaapi_decode_cancel(avctx, pic);
 168         return err;
 169     }
 170
 171     return 0;
 172 }
 173
 174 AVHWAccel ff_mpeg2_vaapi_hwaccel = {
 175     .name                 = "mpeg2_vaapi",
 176     .type                 = AVMEDIA_TYPE_VIDEO,
 177     .id                   = AV_CODEC_ID_MPEG2VIDEO,
 178     .pix_fmt              = AV_PIX_FMT_VAAPI,
 179     .start_frame          = &vaapi_mpeg2_start_frame,
 180     .end_frame            = &vaapi_mpeg2_end_frame,
 181     .decode_slice         = &vaapi_mpeg2_decode_slice,
 182     .frame_priv_data_size = sizeof(VAAPIDecodePicture),
 183     .init                 = &ff_vaapi_decode_init,
 184     .uninit               = &ff_vaapi_decode_uninit,
 185     .priv_data_size       = sizeof(VAAPIDecodeContext),
 186 };