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 "vaapi_internal.h"
  25 #include "internal.h"
  26
  27 /** Reconstruct bitstream f_code */
  28 static inline int mpeg2_get_f_code(MpegEncContext *s)
  29 {
  30     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
  31            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
  32 }
  33
  34 /** Determine frame start: first field for field picture or frame picture */
  35 static inline int mpeg2_get_is_frame_start(MpegEncContext *s)
  36 {
  37     return s->first_field || s->picture_structure == PICT_FRAME;
  38 }
  39
  40 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
  41 {
  42     struct MpegEncContext * const s = avctx->priv_data;
  43     struct vaapi_context * const vactx = avctx->hwaccel_context;
  44     VAPictureParameterBufferMPEG2 *pic_param;
  45     VAIQMatrixBufferMPEG2 *iq_matrix;
  46     int i;
  47
  48     ff_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
  49
  50     vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
  51
  52     /* Fill in VAPictureParameterBufferMPEG2 */
  53     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
  54     if (!pic_param)
  55         return -1;
  56     pic_param->horizontal_size                                  = s->width;
  57     pic_param->vertical_size                                    = s->height;
  58     pic_param->forward_reference_picture                        = VA_INVALID_ID;
  59     pic_param->backward_reference_picture                       = VA_INVALID_ID;
  60     pic_param->picture_coding_type                              = s->pict_type;
  61     pic_param->f_code                                           = mpeg2_get_f_code(s);
  62     pic_param->picture_coding_extension.value                   = 0; /* reset all bits */
  63     pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
  64     pic_param->picture_coding_extension.bits.picture_structure  = s->picture_structure;
  65     pic_param->picture_coding_extension.bits.top_field_first    = s->top_field_first;
  66     pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
  67     pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
  68     pic_param->picture_coding_extension.bits.q_scale_type       = s->q_scale_type;
  69     pic_param->picture_coding_extension.bits.intra_vlc_format   = s->intra_vlc_format;
  70     pic_param->picture_coding_extension.bits.alternate_scan     = s->alternate_scan;
  71     pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
  72     pic_param->picture_coding_extension.bits.progressive_frame  = s->progressive_frame;
  73     pic_param->picture_coding_extension.bits.is_first_field     = mpeg2_get_is_frame_start(s);
  74
  75     switch (s->pict_type) {
  76     case AV_PICTURE_TYPE_B:
  77         pic_param->backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
  78         // fall-through
  79     case AV_PICTURE_TYPE_P:
  80         pic_param->forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
  81         break;
  82     }
  83
  84     /* Fill in VAIQMatrixBufferMPEG2 */
  85     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
  86     if (!iq_matrix)
  87         return -1;
  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     return 0;
 101 }
 102
 103 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
 104 {
 105     MpegEncContext * const s = avctx->priv_data;
 106     VASliceParameterBufferMPEG2 *slice_param;
 107     GetBitContext gb;
 108     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
 109
 110     ff_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
 111
 112     /* Determine macroblock_offset */
 113     init_get_bits(&gb, buffer, 8 * size);
 114     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
 115         return AVERROR_INVALIDDATA;
 116     quantiser_scale_code = get_bits(&gb, 5);
 117     intra_slice_flag = get_bits1(&gb);
 118     if (intra_slice_flag) {
 119         skip_bits(&gb, 8);
 120         if (skip_1stop_8data_bits(&gb) < 0)
 121             return AVERROR_INVALIDDATA;
 122     }
 123     macroblock_offset = get_bits_count(&gb);
 124
 125     /* Fill in VASliceParameterBufferMPEG2 */
 126     slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
 127     if (!slice_param)
 128         return -1;
 129     slice_param->macroblock_offset              = macroblock_offset;
 130     slice_param->slice_horizontal_position      = s->mb_x;
 131     slice_param->slice_vertical_position        = s->mb_y >> (s->picture_structure != PICT_FRAME);
 132     slice_param->quantiser_scale_code           = quantiser_scale_code;
 133     slice_param->intra_slice_flag               = intra_slice_flag;
 134     return 0;
 135 }
 136
 137 AVHWAccel ff_mpeg2_vaapi_hwaccel = {
 138     .name           = "mpeg2_vaapi",
 139     .type           = AVMEDIA_TYPE_VIDEO,
 140     .id             = AV_CODEC_ID_MPEG2VIDEO,
 141     .pix_fmt        = AV_PIX_FMT_VAAPI,
 142     .start_frame    = vaapi_mpeg2_start_frame,
 143     .end_frame      = ff_vaapi_mpeg_end_frame,
 144     .decode_slice   = vaapi_mpeg2_decode_slice,
 145 };