git.sesse.net Git - ffmpeg/blob - libavcodec/vaapi_h264.c

   1 /*
   2  * H.264 HW decode acceleration through VA API
   3  *
   4  * Copyright (C) 2008-2009 Splitted-Desktop Systems
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "h264dec.h"
  24 #include "h264_ps.h"
  25 #include "vaapi_decode.h"
  26
  27 /**
  28  * @file
  29  * This file implements the glue code between Libav's and VA API's
  30  * structures for H.264 decoding.
  31  */
  32
  33 /**
  34  * Initialize an empty VA API picture.
  35  *
  36  * VA API requires a fixed-size reference picture array.
  37  */
  38 static void init_vaapi_pic(VAPictureH264 *va_pic)
  39 {
  40     va_pic->picture_id          = VA_INVALID_ID;
  41     va_pic->flags               = VA_PICTURE_H264_INVALID;
  42     va_pic->TopFieldOrderCnt    = 0;
  43     va_pic->BottomFieldOrderCnt = 0;
  44 }
  45
  46 /**
  47  * Translate an Libav Picture into its VA API form.
  48  *
  49  * @param[out] va_pic          A pointer to VA API's own picture struct
  50  * @param[in]  pic             A pointer to the Libav picture struct to convert
  51  * @param[in]  pic_structure   The picture field type (as defined in mpegvideo.h),
  52  *                             supersedes pic's field type if nonzero.
  53  */
  54 static void fill_vaapi_pic(VAPictureH264 *va_pic,
  55                            const H264Picture *pic,
  56                            int            pic_structure)
  57 {
  58     if (pic_structure == 0)
  59         pic_structure = pic->reference;
  60     pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
  61
  62     va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
  63     va_pic->frame_idx  = pic->long_ref ? pic->pic_id : pic->frame_num;
  64
  65     va_pic->flags      = 0;
  66     if (pic_structure != PICT_FRAME)
  67         va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
  68     if (pic->reference)
  69         va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
  70
  71     va_pic->TopFieldOrderCnt = 0;
  72     if (pic->field_poc[0] != INT_MAX)
  73         va_pic->TopFieldOrderCnt = pic->field_poc[0];
  74
  75     va_pic->BottomFieldOrderCnt = 0;
  76     if (pic->field_poc[1] != INT_MAX)
  77         va_pic->BottomFieldOrderCnt = pic->field_poc[1];
  78 }
  79
  80 /** Decoded Picture Buffer (DPB). */
  81 typedef struct DPB {
  82     int            size;        ///< Current number of reference frames in the DPB
  83     int            max_size;    ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
  84     VAPictureH264 *va_pics;     ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
  85 } DPB;
  86
  87 /**
  88  * Append picture to the decoded picture buffer, in a VA API form that
  89  * merges the second field picture attributes with the first, if
  90  * available.  The decoded picture buffer's size must be large enough
  91  * to receive the new VA API picture object.
  92  */
  93 static int dpb_add(DPB *dpb, const H264Picture *pic)
  94 {
  95     int i;
  96
  97     if (dpb->size >= dpb->max_size)
  98         return -1;
  99
 100     for (i = 0; i < dpb->size; i++) {
 101         VAPictureH264 * const va_pic = &dpb->va_pics[i];
 102         if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
 103             VAPictureH264 temp_va_pic;
 104             fill_vaapi_pic(&temp_va_pic, pic, 0);
 105
 106             if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
 107                 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
 108                 /* Merge second field */
 109                 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
 110                     va_pic->TopFieldOrderCnt    = temp_va_pic.TopFieldOrderCnt;
 111                 } else {
 112                     va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
 113                 }
 114             }
 115             return 0;
 116         }
 117     }
 118
 119     fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
 120     return 0;
 121 }
 122
 123 /** Fill in VA API reference frames array. */
 124 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
 125                                       const H264Context            *h)
 126 {
 127     DPB dpb;
 128     int i;
 129
 130     dpb.size     = 0;
 131     dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
 132     dpb.va_pics  = pic_param->ReferenceFrames;
 133     for (i = 0; i < dpb.max_size; i++)
 134         init_vaapi_pic(&dpb.va_pics[i]);
 135
 136     for (i = 0; i < h->short_ref_count; i++) {
 137         const H264Picture *pic = h->short_ref[i];
 138         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
 139             return -1;
 140     }
 141
 142     for (i = 0; i < 16; i++) {
 143         const H264Picture *pic = h->long_ref[i];
 144         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
 145             return -1;
 146     }
 147     return 0;
 148 }
 149
 150 /**
 151  * Fill in VA API reference picture lists from the Libav reference
 152  * picture list.
 153  *
 154  * @param[out] RefPicList  VA API internal reference picture list
 155  * @param[in]  ref_list    A pointer to the Libav reference list
 156  * @param[in]  ref_count   The number of reference pictures in ref_list
 157  */
 158 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
 159                                   const H264Ref *ref_list,
 160                                   unsigned int  ref_count)
 161 {
 162     unsigned int i, n = 0;
 163     for (i = 0; i < ref_count; i++)
 164         if (ref_list[i].reference)
 165             fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent,
 166                            ref_list[i].reference);
 167
 168     for (; n < 32; n++)
 169         init_vaapi_pic(&RefPicList[n]);
 170 }
 171
 172 /**
 173  * Fill in prediction weight table.
 174  *
 175  * VA API requires a plain prediction weight table as it does not infer
 176  * any value.
 177  *
 178  * @param[in]  h                   A pointer to the current H.264 context
 179  * @param[in]  list                The reference frame list index to use
 180  * @param[out] luma_weight_flag    VA API plain luma weight flag
 181  * @param[out] luma_weight         VA API plain luma weight table
 182  * @param[out] luma_offset         VA API plain luma offset table
 183  * @param[out] chroma_weight_flag  VA API plain chroma weight flag
 184  * @param[out] chroma_weight       VA API plain chroma weight table
 185  * @param[out] chroma_offset       VA API plain chroma offset table
 186  */
 187 static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
 188                                                int            list,
 189                                                unsigned char *luma_weight_flag,
 190                                                short          luma_weight[32],
 191                                                short          luma_offset[32],
 192                                                unsigned char *chroma_weight_flag,
 193                                                short          chroma_weight[32][2],
 194                                                short          chroma_offset[32][2])
 195 {
 196     const H264SliceContext *sl = &h->slice_ctx[0];
 197     unsigned int i, j;
 198
 199     *luma_weight_flag    = sl->pwt.luma_weight_flag[list];
 200     *chroma_weight_flag  = sl->pwt.chroma_weight_flag[list];
 201
 202     for (i = 0; i < sl->ref_count[list]; i++) {
 203         /* VA API also wants the inferred (default) values, not
 204            only what is available in the bitstream (7.4.3.2). */
 205         if (sl->pwt.luma_weight_flag[list]) {
 206             luma_weight[i] = sl->pwt.luma_weight[i][list][0];
 207             luma_offset[i] = sl->pwt.luma_weight[i][list][1];
 208         } else {
 209             luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
 210             luma_offset[i] = 0;
 211         }
 212         for (j = 0; j < 2; j++) {
 213             if (sl->pwt.chroma_weight_flag[list]) {
 214                 chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
 215                 chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
 216             } else {
 217                 chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
 218                 chroma_offset[i][j] = 0;
 219             }
 220         }
 221     }
 222 }
 223
 224 /** Initialize and start decoding a frame with VA API. */
 225 static int vaapi_h264_start_frame(AVCodecContext          *avctx,
 226                                   av_unused const uint8_t *buffer,
 227                                   av_unused uint32_t       size)
 228 {
 229     const H264Context *h = avctx->priv_data;
 230     VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
 231     const PPS *pps = h->ps.pps;
 232     const SPS *sps = h->ps.sps;
 233     VAPictureParameterBufferH264 pic_param;
 234     VAIQMatrixBufferH264 iq_matrix;
 235     int err;
 236
 237     pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f);
 238
 239     pic_param = (VAPictureParameterBufferH264) {
 240         .picture_width_in_mbs_minus1                = h->mb_width - 1,
 241         .picture_height_in_mbs_minus1               = h->mb_height - 1,
 242         .bit_depth_luma_minus8                      = sps->bit_depth_luma - 8,
 243         .bit_depth_chroma_minus8                    = sps->bit_depth_chroma - 8,
 244         .num_ref_frames                             = sps->ref_frame_count,
 245         .seq_fields.bits = {
 246             .chroma_format_idc                      = sps->chroma_format_idc,
 247             .residual_colour_transform_flag         = sps->residual_color_transform_flag,
 248             .gaps_in_frame_num_value_allowed_flag   = sps->gaps_in_frame_num_allowed_flag,
 249             .frame_mbs_only_flag                    = sps->frame_mbs_only_flag,
 250             .mb_adaptive_frame_field_flag           = sps->mb_aff,
 251             .direct_8x8_inference_flag              = sps->direct_8x8_inference_flag,
 252             .MinLumaBiPredSize8x8                   = sps->level_idc >= 31, /* A.3.3.2 */
 253             .log2_max_frame_num_minus4              = sps->log2_max_frame_num - 4,
 254             .pic_order_cnt_type                     = sps->poc_type,
 255             .log2_max_pic_order_cnt_lsb_minus4      = sps->log2_max_poc_lsb - 4,
 256             .delta_pic_order_always_zero_flag       = sps->delta_pic_order_always_zero_flag,
 257         },
 258         .num_slice_groups_minus1                    = pps->slice_group_count - 1,
 259         .slice_group_map_type                       = pps->mb_slice_group_map_type,
 260         .slice_group_change_rate_minus1             = 0, /* FMO is not implemented */
 261         .pic_init_qp_minus26                        = pps->init_qp - 26,
 262         .pic_init_qs_minus26                        = pps->init_qs - 26,
 263         .chroma_qp_index_offset                     = pps->chroma_qp_index_offset[0],
 264         .second_chroma_qp_index_offset              = pps->chroma_qp_index_offset[1],
 265         .pic_fields.bits = {
 266             .entropy_coding_mode_flag               = pps->cabac,
 267             .weighted_pred_flag                     = pps->weighted_pred,
 268             .weighted_bipred_idc                    = pps->weighted_bipred_idc,
 269             .transform_8x8_mode_flag                = pps->transform_8x8_mode,
 270             .field_pic_flag                         = h->picture_structure != PICT_FRAME,
 271             .constrained_intra_pred_flag            = pps->constrained_intra_pred,
 272             .pic_order_present_flag                 = pps->pic_order_present,
 273             .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
 274             .redundant_pic_cnt_present_flag         = pps->redundant_pic_cnt_present,
 275             .reference_pic_flag                     = h->nal_ref_idc != 0,
 276         },
 277         .frame_num                                  = h->poc.frame_num,
 278     };
 279
 280     fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure);
 281     err = fill_vaapi_ReferenceFrames(&pic_param, h);
 282     if (err < 0)
 283         goto fail;
 284
 285     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
 286                                             VAPictureParameterBufferType,
 287                                             &pic_param, sizeof(pic_param));
 288     if (err < 0)
 289         goto fail;
 290
 291     memcpy(iq_matrix.ScalingList4x4,
 292            pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4));
 293     memcpy(iq_matrix.ScalingList8x8[0],
 294            pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0]));
 295     memcpy(iq_matrix.ScalingList8x8[1],
 296            pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0]));
 297
 298     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
 299                                             VAIQMatrixBufferType,
 300                                             &iq_matrix, sizeof(iq_matrix));
 301     if (err < 0)
 302         goto fail;
 303
 304     return 0;
 305
 306 fail:
 307     ff_vaapi_decode_cancel(avctx, pic);
 308     return err;
 309 }
 310
 311 /** End a hardware decoding based frame. */
 312 static int vaapi_h264_end_frame(AVCodecContext *avctx)
 313 {
 314     const H264Context *h = avctx->priv_data;
 315     VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
 316     H264SliceContext *sl = &h->slice_ctx[0];
 317     int ret;
 318
 319     ret = ff_vaapi_decode_issue(avctx, pic);
 320     if (ret < 0)
 321         goto finish;
 322
 323     ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
 324
 325 finish:
 326     return ret;
 327 }
 328
 329 /** Decode the given H.264 slice with VA API. */
 330 static int vaapi_h264_decode_slice(AVCodecContext *avctx,
 331                                    const uint8_t  *buffer,
 332                                    uint32_t        size)
 333 {
 334     const H264Context *h = avctx->priv_data;
 335     VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
 336     const H264SliceContext *sl  = &h->slice_ctx[0];
 337     VASliceParameterBufferH264 slice_param;
 338     int err;
 339
 340     slice_param = (VASliceParameterBufferH264) {
 341         .slice_data_size               = size,
 342         .slice_data_offset             = 0,
 343         .slice_data_flag               = VA_SLICE_DATA_FLAG_ALL,
 344         .slice_data_bit_offset         = get_bits_count(&sl->gb),
 345         .first_mb_in_slice             = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x,
 346         .slice_type                    = ff_h264_get_slice_type(sl),
 347         .direct_spatial_mv_pred_flag   = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0,
 348         .num_ref_idx_l0_active_minus1  = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
 349         .num_ref_idx_l1_active_minus1  = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
 350         .cabac_init_idc                = sl->cabac_init_idc,
 351         .slice_qp_delta                = sl->qscale - h->ps.pps->init_qp,
 352         .disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
 353         .slice_alpha_c0_offset_div2    = sl->slice_alpha_c0_offset / 2,
 354         .slice_beta_offset_div2        = sl->slice_beta_offset     / 2,
 355         .luma_log2_weight_denom        = sl->pwt.luma_log2_weight_denom,
 356         .chroma_log2_weight_denom      = sl->pwt.chroma_log2_weight_denom,
 357     };
 358
 359     fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0],
 360                           sl->list_count > 0 ? sl->ref_count[0] : 0);
 361     fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1],
 362                           sl->list_count > 1 ? sl->ref_count[1] : 0);
 363
 364     fill_vaapi_plain_pred_weight_table(h, 0,
 365                                        &slice_param.luma_weight_l0_flag,
 366                                        slice_param.luma_weight_l0,
 367                                        slice_param.luma_offset_l0,
 368                                        &slice_param.chroma_weight_l0_flag,
 369                                        slice_param.chroma_weight_l0,
 370                                        slice_param.chroma_offset_l0);
 371     fill_vaapi_plain_pred_weight_table(h, 1,
 372                                        &slice_param.luma_weight_l1_flag,
 373                                        slice_param.luma_weight_l1,
 374                                        slice_param.luma_offset_l1,
 375                                        &slice_param.chroma_weight_l1_flag,
 376                                        slice_param.chroma_weight_l1,
 377                                        slice_param.chroma_offset_l1);
 378
 379     err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
 380                                             &slice_param, sizeof(slice_param),
 381                                             buffer, size);
 382     if (err) {
 383         ff_vaapi_decode_cancel(avctx, pic);
 384         return err;
 385     }
 386
 387     return 0;
 388 }
 389
 390 AVHWAccel ff_h264_vaapi_hwaccel = {
 391     .name                 = "h264_vaapi",
 392     .type                 = AVMEDIA_TYPE_VIDEO,
 393     .id                   = AV_CODEC_ID_H264,
 394     .pix_fmt              = AV_PIX_FMT_VAAPI,
 395     .start_frame          = &vaapi_h264_start_frame,
 396     .end_frame            = &vaapi_h264_end_frame,
 397     .decode_slice         = &vaapi_h264_decode_slice,
 398     .frame_priv_data_size = sizeof(VAAPIDecodePicture),
 399     .init                 = &ff_vaapi_decode_init,
 400     .uninit               = &ff_vaapi_decode_uninit,
 401     .priv_data_size       = sizeof(VAAPIDecodeContext),
 402 };