/* * H.264 HW decode acceleration through VA API * * Copyright (C) 2008-2009 Splitted-Desktop Systems * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "h264dec.h" #include "h264_ps.h" #include "vaapi_decode.h" /** * @file * This file implements the glue code between Libav's and VA API's * structures for H.264 decoding. */ /** * Initialize an empty VA API picture. * * VA API requires a fixed-size reference picture array. */ static void init_vaapi_pic(VAPictureH264 *va_pic) { va_pic->picture_id = VA_INVALID_ID; va_pic->flags = VA_PICTURE_H264_INVALID; va_pic->TopFieldOrderCnt = 0; va_pic->BottomFieldOrderCnt = 0; } /** * Translate an Libav Picture into its VA API form. * * @param[out] va_pic A pointer to VA API's own picture struct * @param[in] pic A pointer to the Libav picture struct to convert * @param[in] pic_structure The picture field type (as defined in mpegvideo.h), * supersedes pic's field type if nonzero. */ static void fill_vaapi_pic(VAPictureH264 *va_pic, const H264Picture *pic, int pic_structure) { if (pic_structure == 0) pic_structure = pic->reference; pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */ va_pic->picture_id = ff_vaapi_get_surface_id(pic->f); va_pic->frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num; va_pic->flags = 0; if (pic_structure != PICT_FRAME) va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD; if (pic->reference) va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE; va_pic->TopFieldOrderCnt = 0; if (pic->field_poc[0] != INT_MAX) va_pic->TopFieldOrderCnt = pic->field_poc[0]; va_pic->BottomFieldOrderCnt = 0; if (pic->field_poc[1] != INT_MAX) va_pic->BottomFieldOrderCnt = pic->field_poc[1]; } /** Decoded Picture Buffer (DPB). */ typedef struct DPB { int size; ///< Current number of reference frames in the DPB int max_size; ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames) VAPictureH264 *va_pics; ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array } DPB; /** * Append picture to the decoded picture buffer, in a VA API form that * merges the second field picture attributes with the first, if * available. The decoded picture buffer's size must be large enough * to receive the new VA API picture object. */ static int dpb_add(DPB *dpb, const H264Picture *pic) { int i; if (dpb->size >= dpb->max_size) return -1; for (i = 0; i < dpb->size; i++) { VAPictureH264 * const va_pic = &dpb->va_pics[i]; if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) { VAPictureH264 temp_va_pic; fill_vaapi_pic(&temp_va_pic, pic, 0); if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) { va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD); /* Merge second field */ if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) { va_pic->TopFieldOrderCnt = temp_va_pic.TopFieldOrderCnt; } else { va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt; } } return 0; } } fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0); return 0; } /** Fill in VA API reference frames array. */ static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param, const H264Context *h) { DPB dpb; int i; dpb.size = 0; dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames); dpb.va_pics = pic_param->ReferenceFrames; for (i = 0; i < dpb.max_size; i++) init_vaapi_pic(&dpb.va_pics[i]); for (i = 0; i < h->short_ref_count; i++) { const H264Picture *pic = h->short_ref[i]; if (pic && pic->reference && dpb_add(&dpb, pic) < 0) return -1; } for (i = 0; i < 16; i++) { const H264Picture *pic = h->long_ref[i]; if (pic && pic->reference && dpb_add(&dpb, pic) < 0) return -1; } return 0; } /** * Fill in VA API reference picture lists from the Libav reference * picture list. * * @param[out] RefPicList VA API internal reference picture list * @param[in] ref_list A pointer to the Libav reference list * @param[in] ref_count The number of reference pictures in ref_list */ static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32], const H264Ref *ref_list, unsigned int ref_count) { unsigned int i, n = 0; for (i = 0; i < ref_count; i++) if (ref_list[i].reference) fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent, ref_list[i].reference); for (; n < 32; n++) init_vaapi_pic(&RefPicList[n]); } /** * Fill in prediction weight table. * * VA API requires a plain prediction weight table as it does not infer * any value. * * @param[in] h A pointer to the current H.264 context * @param[in] list The reference frame list index to use * @param[out] luma_weight_flag VA API plain luma weight flag * @param[out] luma_weight VA API plain luma weight table * @param[out] luma_offset VA API plain luma offset table * @param[out] chroma_weight_flag VA API plain chroma weight flag * @param[out] chroma_weight VA API plain chroma weight table * @param[out] chroma_offset VA API plain chroma offset table */ static void fill_vaapi_plain_pred_weight_table(const H264Context *h, int list, unsigned char *luma_weight_flag, short luma_weight[32], short luma_offset[32], unsigned char *chroma_weight_flag, short chroma_weight[32][2], short chroma_offset[32][2]) { const H264SliceContext *sl = &h->slice_ctx[0]; unsigned int i, j; *luma_weight_flag = sl->pwt.luma_weight_flag[list]; *chroma_weight_flag = sl->pwt.chroma_weight_flag[list]; for (i = 0; i < sl->ref_count[list]; i++) { /* VA API also wants the inferred (default) values, not only what is available in the bitstream (7.4.3.2). */ if (sl->pwt.luma_weight_flag[list]) { luma_weight[i] = sl->pwt.luma_weight[i][list][0]; luma_offset[i] = sl->pwt.luma_weight[i][list][1]; } else { luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom; luma_offset[i] = 0; } for (j = 0; j < 2; j++) { if (sl->pwt.chroma_weight_flag[list]) { chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0]; chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1]; } else { chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom; chroma_offset[i][j] = 0; } } } } /** Initialize and start decoding a frame with VA API. */ static int vaapi_h264_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) { const H264Context *h = avctx->priv_data; VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private; const PPS *pps = h->ps.pps; const SPS *sps = h->ps.sps; VAPictureParameterBufferH264 pic_param; VAIQMatrixBufferH264 iq_matrix; int err; pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f); pic_param = (VAPictureParameterBufferH264) { .picture_width_in_mbs_minus1 = h->mb_width - 1, .picture_height_in_mbs_minus1 = h->mb_height - 1, .bit_depth_luma_minus8 = sps->bit_depth_luma - 8, .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8, .num_ref_frames = sps->ref_frame_count, .seq_fields.bits = { .chroma_format_idc = sps->chroma_format_idc, .residual_colour_transform_flag = sps->residual_color_transform_flag, .gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag, .frame_mbs_only_flag = sps->frame_mbs_only_flag, .mb_adaptive_frame_field_flag = sps->mb_aff, .direct_8x8_inference_flag = sps->direct_8x8_inference_flag, .MinLumaBiPredSize8x8 = sps->level_idc >= 31, /* A.3.3.2 */ .log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4, .pic_order_cnt_type = sps->poc_type, .log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4, .delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag, }, .num_slice_groups_minus1 = pps->slice_group_count - 1, .slice_group_map_type = pps->mb_slice_group_map_type, .slice_group_change_rate_minus1 = 0, /* FMO is not implemented */ .pic_init_qp_minus26 = pps->init_qp - 26, .pic_init_qs_minus26 = pps->init_qs - 26, .chroma_qp_index_offset = pps->chroma_qp_index_offset[0], .second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1], .pic_fields.bits = { .entropy_coding_mode_flag = pps->cabac, .weighted_pred_flag = pps->weighted_pred, .weighted_bipred_idc = pps->weighted_bipred_idc, .transform_8x8_mode_flag = pps->transform_8x8_mode, .field_pic_flag = h->picture_structure != PICT_FRAME, .constrained_intra_pred_flag = pps->constrained_intra_pred, .pic_order_present_flag = pps->pic_order_present, .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present, .redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present, .reference_pic_flag = h->nal_ref_idc != 0, }, .frame_num = h->poc.frame_num, }; fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure); err = fill_vaapi_ReferenceFrames(&pic_param, h); if (err < 0) goto fail; err = ff_vaapi_decode_make_param_buffer(avctx, pic, VAPictureParameterBufferType, &pic_param, sizeof(pic_param)); if (err < 0) goto fail; memcpy(iq_matrix.ScalingList4x4, pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4)); memcpy(iq_matrix.ScalingList8x8[0], pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0])); memcpy(iq_matrix.ScalingList8x8[1], pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0])); err = ff_vaapi_decode_make_param_buffer(avctx, pic, VAIQMatrixBufferType, &iq_matrix, sizeof(iq_matrix)); if (err < 0) goto fail; return 0; fail: ff_vaapi_decode_cancel(avctx, pic); return err; } /** End a hardware decoding based frame. */ static int vaapi_h264_end_frame(AVCodecContext *avctx) { const H264Context *h = avctx->priv_data; VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private; H264SliceContext *sl = &h->slice_ctx[0]; int ret; ret = ff_vaapi_decode_issue(avctx, pic); if (ret < 0) goto finish; ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height); finish: return ret; } /** Decode the given H.264 slice with VA API. */ static int vaapi_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) { const H264Context *h = avctx->priv_data; VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private; const H264SliceContext *sl = &h->slice_ctx[0]; VASliceParameterBufferH264 slice_param; int err; slice_param = (VASliceParameterBufferH264) { .slice_data_size = size, .slice_data_offset = 0, .slice_data_flag = VA_SLICE_DATA_FLAG_ALL, .slice_data_bit_offset = get_bits_count(&sl->gb), .first_mb_in_slice = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x, .slice_type = ff_h264_get_slice_type(sl), .direct_spatial_mv_pred_flag = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0, .num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0, .num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0, .cabac_init_idc = sl->cabac_init_idc, .slice_qp_delta = sl->qscale - h->ps.pps->init_qp, .disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter, .slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2, .slice_beta_offset_div2 = sl->slice_beta_offset / 2, .luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom, .chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom, }; fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0], sl->list_count > 0 ? sl->ref_count[0] : 0); fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1], sl->list_count > 1 ? sl->ref_count[1] : 0); fill_vaapi_plain_pred_weight_table(h, 0, &slice_param.luma_weight_l0_flag, slice_param.luma_weight_l0, slice_param.luma_offset_l0, &slice_param.chroma_weight_l0_flag, slice_param.chroma_weight_l0, slice_param.chroma_offset_l0); fill_vaapi_plain_pred_weight_table(h, 1, &slice_param.luma_weight_l1_flag, slice_param.luma_weight_l1, slice_param.luma_offset_l1, &slice_param.chroma_weight_l1_flag, slice_param.chroma_weight_l1, slice_param.chroma_offset_l1); err = ff_vaapi_decode_make_slice_buffer(avctx, pic, &slice_param, sizeof(slice_param), buffer, size); if (err) { ff_vaapi_decode_cancel(avctx, pic); return err; } return 0; } AVHWAccel ff_h264_vaapi_hwaccel = { .name = "h264_vaapi", .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_H264, .pix_fmt = AV_PIX_FMT_VAAPI, .start_frame = &vaapi_h264_start_frame, .end_frame = &vaapi_h264_end_frame, .decode_slice = &vaapi_h264_decode_slice, .frame_priv_data_size = sizeof(VAAPIDecodePicture), .init = &ff_vaapi_decode_init, .uninit = &ff_vaapi_decode_uninit, .priv_data_size = sizeof(VAAPIDecodeContext), };