| /* | |
| * 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 "hwaccel_internal.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, 1, sizeof(slice_param), | |
| buffer, size); | |
| if (err) { | |
| ff_vaapi_decode_cancel(avctx, pic); | |
| return err; | |
| } | |
| return 0; | |
| } | |
| const FFHWAccel ff_h264_vaapi_hwaccel = { | |
| .p.name = "h264_vaapi", | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_H264, | |
| .p.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, | |
| }; |