| /* |
| * H.264 HW decode acceleration through VA API |
| * |
| * Copyright (C) 2008-2009 Splitted-Desktop Systems |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 "hwconfig.h" |
| #include "vaapi_decode.h" |
| |
| /** |
| * @file |
| * This file implements the glue code between FFmpeg'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 FFmpeg 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 FFmpeg 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 FFmpeg reference |
| * picture list. |
| * |
| * @param[out] RefPicList VA API internal reference picture list |
| * @param[in] ref_list A pointer to the FFmpeg 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, |
| }, |
| .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; |
| } |
| |
| const 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, |
| .frame_params = &ff_vaapi_common_frame_params, |
| .priv_data_size = sizeof(VAAPIDecodeContext), |
| .caps_internal = HWACCEL_CAP_ASYNC_SAFE, |
| }; |
