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 "hwaccel.h"
  24 #include "mpegutils.h"
  25 #include "mpegvideo.h"
  26 #include "internal.h"
  27 #include "vaapi_decode.h"
  28
  29 /** Reconstruct bitstream f_code */
  30 static inline int mpeg2_get_f_code(const MpegEncContext *s)
  31 {
  32     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
  33            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
  34 }
  35
  36 /** Determine frame start: first field for field picture or frame picture */
  37 static inline int mpeg2_get_is_frame_start(const MpegEncContext *s)
  38 {
  39     return s->first_field || s->picture_structure == PICT_FRAME;
  40 }
  41
  42 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  43 {
  44     const MpegEncContext *s = avctx->priv_data;
  45     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
  46     VAPictureParameterBufferMPEG2 pic_param;
  47     VAIQMatrixBufferMPEG2 iq_matrix;
  48     int i, err;
  49
  50     pic->output_surface = ff_vaapi_get_surface_id(s->current_picture_ptr->f);
  51
  52     pic_param = (VAPictureParameterBufferMPEG2) {
  53         .horizontal_size                 = s->width,
  54         .vertical_size                   = s->height,
  55         .forward_reference_picture       = VA_INVALID_ID,
  56         .backward_reference_picture      = VA_INVALID_ID,
  57         .picture_coding_type             = s->pict_type,
  58         .f_code                          = mpeg2_get_f_code(s),
  59         .picture_coding_extension.bits = {
  60             .intra_dc_precision          = s->intra_dc_precision,
  61             .picture_structure           = s->picture_structure,
  62             .top_field_first             = s->top_field_first,
  63             .frame_pred_frame_dct        = s->frame_pred_frame_dct,
  64             .concealment_motion_vectors  = s->concealment_motion_vectors,
  65             .q_scale_type                = s->q_scale_type,
  66             .intra_vlc_format            = s->intra_vlc_format,
  67             .alternate_scan              = s->alternate_scan,
  68             .repeat_first_field          = s->repeat_first_field,
  69             .progressive_frame           = s->progressive_frame,
  70             .is_first_field              = mpeg2_get_is_frame_start(s),
  71         },
  72     };
  73
  74     switch (s->pict_type) {
  75     case AV_PICTURE_TYPE_B:
  76         pic_param.backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
  77         // fall-through
  78     case AV_PICTURE_TYPE_P:
  79         pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
  80         break;
  81     }
  82
  83     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
  84                                             VAPictureParameterBufferType,
  85                                             &pic_param, sizeof(pic_param));
  86     if (err < 0)
  87         goto fail;
  88
  89     iq_matrix.load_intra_quantiser_matrix              = 1;
  90     iq_matrix.load_non_intra_quantiser_matrix          = 1;
  91     iq_matrix.load_chroma_intra_quantiser_matrix       = 1;
  92     iq_matrix.load_chroma_non_intra_quantiser_matrix   = 1;
  93
  94     for (i = 0; i < 64; i++) {
  95         int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
  96         iq_matrix.intra_quantiser_matrix[i]            = s->intra_matrix[n];
  97         iq_matrix.non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
  98         iq_matrix.chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
  99         iq_matrix.chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
 100     }
 101
 102     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
 103                                             VAIQMatrixBufferType,
 104                                             &iq_matrix, sizeof(iq_matrix));
 105     if (err < 0)
 106         goto fail;
 107
 108     return 0;
 109
 110 fail:
 111     ff_vaapi_decode_cancel(avctx, pic);
 112     return err;
 113 }
 114
 115 static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
 116 {
 117     MpegEncContext     *s   = avctx->priv_data;
 118     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
 119     int ret;
 120
 121     ret = ff_vaapi_decode_issue(avctx, pic);
 122     if (ret < 0)
 123         goto fail;
 124
 125     ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);
 126
 127 fail:
 128     return ret;
 129 }
 130
 131 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 132 {
 133     const MpegEncContext *s = avctx->priv_data;
 134     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
 135     VASliceParameterBufferMPEG2 slice_param;
 136     GetBitContext gb;
 137     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
 138     int err;
 139
 140     /* Determine macroblock_offset */
 141     init_get_bits(&gb, buffer, 8 * size);
 142     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
 143         return AVERROR_INVALIDDATA;
 144     quantiser_scale_code = get_bits(&gb, 5);
 145     intra_slice_flag = get_bits1(&gb);
 146     if (intra_slice_flag) {
 147         skip_bits(&gb, 8);
 148         if (skip_1stop_8data_bits(&gb) < 0)
 149             return AVERROR_INVALIDDATA;
 150     }
 151     macroblock_offset = get_bits_count(&gb);
 152
 153     slice_param = (VASliceParameterBufferMPEG2) {
 154         .slice_data_size            = size,
 155         .slice_data_offset          = 0,
 156         .slice_data_flag            = VA_SLICE_DATA_FLAG_ALL,
 157         .macroblock_offset          = macroblock_offset,
 158         .slice_horizontal_position  = s->mb_x,
 159         .slice_vertical_position    = s->mb_y >> (s->picture_structure != PICT_FRAME),
 160         .quantiser_scale_code       = quantiser_scale_code,
 161         .intra_slice_flag           = intra_slice_flag,
 162     };
 163
 164     err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
 165                                             &slice_param, sizeof(slice_param),
 166                                             buffer, size);
 167     if (err < 0) {
 168         ff_vaapi_decode_cancel(avctx, pic);
 169         return err;
 170     }
 171
 172     return 0;
 173 }
 174
 175 const AVHWAccel ff_mpeg2_vaapi_hwaccel = {
 176     .name                 = "mpeg2_vaapi",
 177     .type                 = AVMEDIA_TYPE_VIDEO,
 178     .id                   = AV_CODEC_ID_MPEG2VIDEO,
 179     .pix_fmt              = AV_PIX_FMT_VAAPI,
 180     .start_frame          = &vaapi_mpeg2_start_frame,
 181     .end_frame            = &vaapi_mpeg2_end_frame,
 182     .decode_slice         = &vaapi_mpeg2_decode_slice,
 183     .frame_priv_data_size = sizeof(VAAPIDecodePicture),
 184     .init                 = &ff_vaapi_decode_init,
 185     .uninit               = &ff_vaapi_decode_uninit,
 186     .frame_params         = &ff_vaapi_common_frame_params,
 187     .priv_data_size       = sizeof(VAAPIDecodeContext),
 188     .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
 189 };