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  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 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. #include "h264.h"
  25.  
  26. /**
  27.  * @file
  28.  * This file implements the glue code between FFmpeg's and VA API's
  29.  * structures for H.264 decoding.
  30.  */
  31.  
  32. /**
  33.  * Initialize an empty VA API picture.
  34.  *
  35.  * VA API requires a fixed-size reference picture array.
  36.  */
  37. static void init_vaapi_pic(VAPictureH264 *va_pic)
  38. {
  39.     va_pic->picture_id          = VA_INVALID_ID;
  40.     va_pic->flags               = VA_PICTURE_H264_INVALID;
  41.     va_pic->TopFieldOrderCnt    = 0;
  42.     va_pic->BottomFieldOrderCnt = 0;
  43. }
  44.  
  45. /**
  46.  * Translate an FFmpeg Picture into its VA API form.
  47.  *
  48.  * @param[out] va_pic          A pointer to VA API's own picture struct
  49.  * @param[in]  pic             A pointer to the FFmpeg picture struct to convert
  50.  * @param[in]  pic_structure   The picture field type (as defined in mpegvideo.h),
  51.  *                             supersedes pic's field type if nonzero.
  52.  */
  53. static void fill_vaapi_pic(VAPictureH264 *va_pic,
  54.                            Picture       *pic,
  55.                            int            pic_structure)
  56. {
  57.     if (pic_structure == 0)
  58.         pic_structure = pic->reference;
  59.     pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
  60.  
  61.     va_pic->picture_id = ff_vaapi_get_surface_id(pic);
  62.     va_pic->frame_idx  = pic->long_ref ? pic->pic_id : pic->frame_num;
  63.  
  64.     va_pic->flags      = 0;
  65.     if (pic_structure != PICT_FRAME)
  66.         va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
  67.     if (pic->reference)
  68.         va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
  69.  
  70.     va_pic->TopFieldOrderCnt = 0;
  71.     if (pic->field_poc[0] != INT_MAX)
  72.         va_pic->TopFieldOrderCnt = pic->field_poc[0];
  73.  
  74.     va_pic->BottomFieldOrderCnt = 0;
  75.     if (pic->field_poc[1] != INT_MAX)
  76.         va_pic->BottomFieldOrderCnt = pic->field_poc[1];
  77. }
  78.  
  79. /** Decoded Picture Buffer (DPB). */
  80. typedef struct DPB {
  81.     int            size;        ///< Current number of reference frames in the DPB
  82.     int            max_size;    ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
  83.     VAPictureH264 *va_pics;     ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
  84. } DPB;
  85.  
  86. /**
  87.  * Append picture to the decoded picture buffer, in a VA API form that
  88.  * merges the second field picture attributes with the first, if
  89.  * available.  The decoded picture buffer's size must be large enough
  90.  * to receive the new VA API picture object.
  91.  */
  92. static int dpb_add(DPB *dpb, Picture *pic)
  93. {
  94.     int i;
  95.  
  96.     if (dpb->size >= dpb->max_size)
  97.         return -1;
  98.  
  99.     for (i = 0; i < dpb->size; i++) {
  100.         VAPictureH264 * const va_pic = &dpb->va_pics[i];
  101.         if (va_pic->picture_id == ff_vaapi_get_surface_id(pic)) {
  102.             VAPictureH264 temp_va_pic;
  103.             fill_vaapi_pic(&temp_va_pic, pic, 0);
  104.  
  105.             if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
  106.                 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
  107.                 /* Merge second field */
  108.                 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
  109.                     va_pic->TopFieldOrderCnt    = temp_va_pic.TopFieldOrderCnt;
  110.                 } else {
  111.                     va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
  112.                 }
  113.             }
  114.             return 0;
  115.         }
  116.     }
  117.  
  118.     fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
  119.     return 0;
  120. }
  121.  
  122. /** Fill in VA API reference frames array. */
  123. static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
  124.                                       H264Context                  *h)
  125. {
  126.     DPB dpb;
  127.     int i;
  128.  
  129.     dpb.size     = 0;
  130.     dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
  131.     dpb.va_pics  = pic_param->ReferenceFrames;
  132.     for (i = 0; i < dpb.max_size; i++)
  133.         init_vaapi_pic(&dpb.va_pics[i]);
  134.  
  135.     for (i = 0; i < h->short_ref_count; i++) {
  136.         Picture * const pic = h->short_ref[i];
  137.         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
  138.             return -1;
  139.     }
  140.  
  141.     for (i = 0; i < 16; i++) {
  142.         Picture * const pic = h->long_ref[i];
  143.         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
  144.             return -1;
  145.     }
  146.     return 0;
  147. }
  148.  
  149. /**
  150.  * Fill in VA API reference picture lists from the FFmpeg reference
  151.  * picture list.
  152.  *
  153.  * @param[out] RefPicList  VA API internal reference picture list
  154.  * @param[in]  ref_list    A pointer to the FFmpeg reference list
  155.  * @param[in]  ref_count   The number of reference pictures in ref_list
  156.  */
  157. static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
  158.                                   Picture      *ref_list,
  159.                                   unsigned int  ref_count)
  160. {
  161.     unsigned int i, n = 0;
  162.     for (i = 0; i < ref_count; i++)
  163.         if (ref_list[i].reference)
  164.             fill_vaapi_pic(&RefPicList[n++], &ref_list[i], 0);
  165.  
  166.     for (; n < 32; n++)
  167.         init_vaapi_pic(&RefPicList[n]);
  168. }
  169.  
  170. /**
  171.  * Fill in prediction weight table.
  172.  *
  173.  * VA API requires a plain prediction weight table as it does not infer
  174.  * any value.
  175.  *
  176.  * @param[in]  h                   A pointer to the current H.264 context
  177.  * @param[in]  list                The reference frame list index to use
  178.  * @param[out] luma_weight_flag    VA API plain luma weight flag
  179.  * @param[out] luma_weight         VA API plain luma weight table
  180.  * @param[out] luma_offset         VA API plain luma offset table
  181.  * @param[out] chroma_weight_flag  VA API plain chroma weight flag
  182.  * @param[out] chroma_weight       VA API plain chroma weight table
  183.  * @param[out] chroma_offset       VA API plain chroma offset table
  184.  */
  185. static void fill_vaapi_plain_pred_weight_table(H264Context   *h,
  186.                                                int            list,
  187.                                                unsigned char *luma_weight_flag,
  188.                                                short          luma_weight[32],
  189.                                                short          luma_offset[32],
  190.                                                unsigned char *chroma_weight_flag,
  191.                                                short          chroma_weight[32][2],
  192.                                                short          chroma_offset[32][2])
  193. {
  194.     unsigned int i, j;
  195.  
  196.     *luma_weight_flag    = h->luma_weight_flag[list];
  197.     *chroma_weight_flag  = h->chroma_weight_flag[list];
  198.  
  199.     for (i = 0; i < h->ref_count[list]; i++) {
  200.         /* VA API also wants the inferred (default) values, not
  201.            only what is available in the bitstream (7.4.3.2). */
  202.         if (h->luma_weight_flag[list]) {
  203.             luma_weight[i] = h->luma_weight[i][list][0];
  204.             luma_offset[i] = h->luma_weight[i][list][1];
  205.         } else {
  206.             luma_weight[i] = 1 << h->luma_log2_weight_denom;
  207.             luma_offset[i] = 0;
  208.         }
  209.         for (j = 0; j < 2; j++) {
  210.             if (h->chroma_weight_flag[list]) {
  211.                 chroma_weight[i][j] = h->chroma_weight[i][list][j][0];
  212.                 chroma_offset[i][j] = h->chroma_weight[i][list][j][1];
  213.             } else {
  214.                 chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom;
  215.                 chroma_offset[i][j] = 0;
  216.             }
  217.         }
  218.     }
  219. }
  220.  
  221. /** Initialize and start decoding a frame with VA API. */
  222. static int vaapi_h264_start_frame(AVCodecContext          *avctx,
  223.                                   av_unused const uint8_t *buffer,
  224.                                   av_unused uint32_t       size)
  225. {
  226.     H264Context * const h = avctx->priv_data;
  227.     struct vaapi_context * const vactx = avctx->hwaccel_context;
  228.     VAPictureParameterBufferH264 *pic_param;
  229.     VAIQMatrixBufferH264 *iq_matrix;
  230.  
  231.     av_dlog(avctx, "vaapi_h264_start_frame()\n");
  232.  
  233.     vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
  234.  
  235.     /* Fill in VAPictureParameterBufferH264. */
  236.     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
  237.     if (!pic_param)
  238.         return -1;
  239.     fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure);
  240.     if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
  241.         return -1;
  242.     pic_param->picture_width_in_mbs_minus1                      = h->mb_width - 1;
  243.     pic_param->picture_height_in_mbs_minus1                     = h->mb_height - 1;
  244.     pic_param->bit_depth_luma_minus8                            = h->sps.bit_depth_luma - 8;
  245.     pic_param->bit_depth_chroma_minus8                          = h->sps.bit_depth_chroma - 8;
  246.     pic_param->num_ref_frames                                   = h->sps.ref_frame_count;
  247.     pic_param->seq_fields.value                                 = 0; /* reset all bits */
  248.     pic_param->seq_fields.bits.chroma_format_idc                = h->sps.chroma_format_idc;
  249.     pic_param->seq_fields.bits.residual_colour_transform_flag   = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
  250.     pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag;
  251.     pic_param->seq_fields.bits.frame_mbs_only_flag              = h->sps.frame_mbs_only_flag;
  252.     pic_param->seq_fields.bits.mb_adaptive_frame_field_flag     = h->sps.mb_aff;
  253.     pic_param->seq_fields.bits.direct_8x8_inference_flag        = h->sps.direct_8x8_inference_flag;
  254.     pic_param->seq_fields.bits.MinLumaBiPredSize8x8             = h->sps.level_idc >= 31; /* A.3.3.2 */
  255.     pic_param->seq_fields.bits.log2_max_frame_num_minus4        = h->sps.log2_max_frame_num - 4;
  256.     pic_param->seq_fields.bits.pic_order_cnt_type               = h->sps.poc_type;
  257.     pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
  258.     pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
  259.     pic_param->num_slice_groups_minus1                          = h->pps.slice_group_count - 1;
  260.     pic_param->slice_group_map_type                             = h->pps.mb_slice_group_map_type;
  261.     pic_param->slice_group_change_rate_minus1                   = 0; /* XXX: unimplemented in FFmpeg */
  262.     pic_param->pic_init_qp_minus26                              = h->pps.init_qp - 26;
  263.     pic_param->pic_init_qs_minus26                              = h->pps.init_qs - 26;
  264.     pic_param->chroma_qp_index_offset                           = h->pps.chroma_qp_index_offset[0];
  265.     pic_param->second_chroma_qp_index_offset                    = h->pps.chroma_qp_index_offset[1];
  266.     pic_param->pic_fields.value                                 = 0; /* reset all bits */
  267.     pic_param->pic_fields.bits.entropy_coding_mode_flag         = h->pps.cabac;
  268.     pic_param->pic_fields.bits.weighted_pred_flag               = h->pps.weighted_pred;
  269.     pic_param->pic_fields.bits.weighted_bipred_idc              = h->pps.weighted_bipred_idc;
  270.     pic_param->pic_fields.bits.transform_8x8_mode_flag          = h->pps.transform_8x8_mode;
  271.     pic_param->pic_fields.bits.field_pic_flag                   = h->picture_structure != PICT_FRAME;
  272.     pic_param->pic_fields.bits.constrained_intra_pred_flag      = h->pps.constrained_intra_pred;
  273.     pic_param->pic_fields.bits.pic_order_present_flag           = h->pps.pic_order_present;
  274.     pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
  275.     pic_param->pic_fields.bits.redundant_pic_cnt_present_flag   = h->pps.redundant_pic_cnt_present;
  276.     pic_param->pic_fields.bits.reference_pic_flag               = h->nal_ref_idc != 0;
  277.     pic_param->frame_num                                        = h->frame_num;
  278.  
  279.     /* Fill in VAIQMatrixBufferH264. */
  280.     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
  281.     if (!iq_matrix)
  282.         return -1;
  283.     memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
  284.     memcpy(iq_matrix->ScalingList8x8[0], h->pps.scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
  285.     memcpy(iq_matrix->ScalingList8x8[1], h->pps.scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
  286.     return 0;
  287. }
  288.  
  289. /** End a hardware decoding based frame. */
  290. static int vaapi_h264_end_frame(AVCodecContext *avctx)
  291. {
  292.     struct vaapi_context * const vactx = avctx->hwaccel_context;
  293.     H264Context * const h = avctx->priv_data;
  294.     int ret;
  295.  
  296.     av_dlog(avctx, "vaapi_h264_end_frame()\n");
  297.     ret = ff_vaapi_commit_slices(vactx);
  298.     if (ret < 0)
  299.         goto finish;
  300.  
  301.     ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->cur_pic_ptr));
  302.     if (ret < 0)
  303.         goto finish;
  304.  
  305.     ff_h264_draw_horiz_band(h, 0, h->avctx->height);
  306.  
  307. finish:
  308.     ff_vaapi_common_end_frame(avctx);
  309.     return ret;
  310. }
  311.  
  312. /** Decode the given H.264 slice with VA API. */
  313. static int vaapi_h264_decode_slice(AVCodecContext *avctx,
  314.                                    const uint8_t  *buffer,
  315.                                    uint32_t        size)
  316. {
  317.     H264Context * const h = avctx->priv_data;
  318.     VASliceParameterBufferH264 *slice_param;
  319.  
  320.     av_dlog(avctx, "vaapi_h264_decode_slice(): buffer %p, size %d\n",
  321.             buffer, size);
  322.  
  323.     /* Fill in VASliceParameterBufferH264. */
  324.     slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
  325.     if (!slice_param)
  326.         return -1;
  327.     slice_param->slice_data_bit_offset          = get_bits_count(&h->gb) + 8; /* bit buffer started beyond nal_unit_type */
  328.     slice_param->first_mb_in_slice              = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
  329.     slice_param->slice_type                     = ff_h264_get_slice_type(h);
  330.     slice_param->direct_spatial_mv_pred_flag    = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0;
  331.     slice_param->num_ref_idx_l0_active_minus1   = h->list_count > 0 ? h->ref_count[0] - 1 : 0;
  332.     slice_param->num_ref_idx_l1_active_minus1   = h->list_count > 1 ? h->ref_count[1] - 1 : 0;
  333.     slice_param->cabac_init_idc                 = h->cabac_init_idc;
  334.     slice_param->slice_qp_delta                 = h->qscale - h->pps.init_qp;
  335.     slice_param->disable_deblocking_filter_idc  = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
  336.     slice_param->slice_alpha_c0_offset_div2     = h->slice_alpha_c0_offset / 2 - 26;
  337.     slice_param->slice_beta_offset_div2         = h->slice_beta_offset     / 2 - 26;
  338.     slice_param->luma_log2_weight_denom         = h->luma_log2_weight_denom;
  339.     slice_param->chroma_log2_weight_denom       = h->chroma_log2_weight_denom;
  340.  
  341.     fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0);
  342.     fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->ref_count[1] : 0);
  343.  
  344.     fill_vaapi_plain_pred_weight_table(h, 0,
  345.                                        &slice_param->luma_weight_l0_flag,   slice_param->luma_weight_l0,   slice_param->luma_offset_l0,
  346.                                        &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0);
  347.     fill_vaapi_plain_pred_weight_table(h, 1,
  348.                                        &slice_param->luma_weight_l1_flag,   slice_param->luma_weight_l1,   slice_param->luma_offset_l1,
  349.                                        &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
  350.     return 0;
  351. }
  352.  
  353. AVHWAccel ff_h264_vaapi_hwaccel = {
  354.     .name           = "h264_vaapi",
  355.     .type           = AVMEDIA_TYPE_VIDEO,
  356.     .id             = AV_CODEC_ID_H264,
  357.     .pix_fmt        = AV_PIX_FMT_VAAPI_VLD,
  358.     .start_frame    = vaapi_h264_start_frame,
  359.     .end_frame      = vaapi_h264_end_frame,
  360.     .decode_slice   = vaapi_h264_decode_slice,
  361. };
  362.