/* * 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 "vaapi_internal.h" #include "h264.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, Picture *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); 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, Picture *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)) { 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, 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++) { Picture * const pic = h->short_ref[i]; if (pic && pic->reference && dpb_add(&dpb, pic) < 0) return -1; } for (i = 0; i < 16; i++) { Picture * const 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], Picture *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], 0); 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(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]) { unsigned int i, j; *luma_weight_flag = h->luma_weight_flag[list]; *chroma_weight_flag = h->chroma_weight_flag[list]; for (i = 0; i < h->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 (h->luma_weight_flag[list]) { luma_weight[i] = h->luma_weight[i][list][0]; luma_offset[i] = h->luma_weight[i][list][1]; } else { luma_weight[i] = 1 << h->luma_log2_weight_denom; luma_offset[i] = 0; } for (j = 0; j < 2; j++) { if (h->chroma_weight_flag[list]) { chroma_weight[i][j] = h->chroma_weight[i][list][j][0]; chroma_offset[i][j] = h->chroma_weight[i][list][j][1]; } else { chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom; chroma_offset[i][j] = 0; } } } } /** Initialize and start decoding a frame with VA API. */ static int start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size) { H264Context * const h = avctx->priv_data; MpegEncContext * const s = &h->s; struct vaapi_context * const vactx = avctx->hwaccel_context; VAPictureParameterBufferH264 *pic_param; VAIQMatrixBufferH264 *iq_matrix; av_dlog(avctx, "start_frame()\n"); vactx->slice_param_size = sizeof(VASliceParameterBufferH264); /* Fill in VAPictureParameterBufferH264. */ pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264)); if (!pic_param) return -1; fill_vaapi_pic(&pic_param->CurrPic, s->current_picture_ptr, s->picture_structure); if (fill_vaapi_ReferenceFrames(pic_param, h) < 0) return -1; pic_param->picture_width_in_mbs_minus1 = s->mb_width - 1; pic_param->picture_height_in_mbs_minus1 = s->mb_height - 1; pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8; pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8; pic_param->num_ref_frames = h->sps.ref_frame_count; pic_param->seq_fields.value = 0; /* reset all bits */ pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc; pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */ pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag; pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag; pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff; pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag; pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */ pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4; pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type; pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4; pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag; pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1; pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type; pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in Libav */ pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26; pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26; pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0]; pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1]; pic_param->pic_fields.value = 0; /* reset all bits */ pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac; pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred; pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc; pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode; pic_param->pic_fields.bits.field_pic_flag = s->picture_structure != PICT_FRAME; pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred; pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present; pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present; pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present; pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0; pic_param->frame_num = h->frame_num; /* Fill in VAIQMatrixBufferH264. */ iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264)); if (!iq_matrix) return -1; memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4)); memcpy(iq_matrix->ScalingList8x8, h->pps.scaling_matrix8, sizeof(iq_matrix->ScalingList8x8)); return 0; } /** End a hardware decoding based frame. */ static int end_frame(AVCodecContext *avctx) { H264Context * const h = avctx->priv_data; av_dlog(avctx, "end_frame()\n"); return ff_vaapi_common_end_frame(&h->s); } /** Decode the given H.264 slice with VA API. */ static int decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size) { H264Context * const h = avctx->priv_data; MpegEncContext * const s = &h->s; VASliceParameterBufferH264 *slice_param; av_dlog(avctx, "decode_slice(): buffer %p, size %d\n", buffer, size); /* Fill in VASliceParameterBufferH264. */ slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size); if (!slice_param) return -1; slice_param->slice_data_bit_offset = get_bits_count(&h->s.gb) + 8; /* bit buffer started beyond nal_unit_type */ slice_param->first_mb_in_slice = (s->mb_y >> FIELD_OR_MBAFF_PICTURE) * s->mb_width + s->mb_x; slice_param->slice_type = ff_h264_get_slice_type(h); slice_param->direct_spatial_mv_pred_flag = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0; slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0; slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0; slice_param->cabac_init_idc = h->cabac_init_idc; slice_param->slice_qp_delta = s->qscale - h->pps.init_qp; slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter; slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2 - 26; slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2 - 26; slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom; slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom; fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0); fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->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); return 0; } AVHWAccel ff_h264_vaapi_hwaccel = { .name = "h264_vaapi", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_H264, .pix_fmt = PIX_FMT_VAAPI_VLD, .capabilities = 0, .start_frame = start_frame, .end_frame = end_frame, .decode_slice = decode_slice, .priv_data_size = 0, };