diff options
Diffstat (limited to 'libavcodec/nvdec_h264.c')
| -rw-r--r-- | libavcodec/nvdec_h264.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/libavcodec/nvdec_h264.c b/libavcodec/nvdec_h264.c new file mode 100644 index 0000000000..116bd4fb5d --- /dev/null +++ b/libavcodec/nvdec_h264.c @@ -0,0 +1,184 @@ +/* + * MPEG-4 Part 10 / AVC / H.264 HW decode acceleration through NVDEC + * + * Copyright (c) 2016 Anton Khirnov + * + * 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 <stdint.h> +#include <string.h> + +#include "avcodec.h" +#include "nvdec.h" +#include "decode.h" +#include "internal.h" +#include "h264dec.h" + +static void dpb_add(const H264Context *h, CUVIDH264DPBENTRY *dst, const H264Picture *src, + int frame_idx) +{ + FrameDecodeData *fdd = (FrameDecodeData*)src->f->private_ref->data; + const NVDECFrame *cf = fdd->hwaccel_priv; + + dst->PicIdx = cf ? cf->idx : -1; + dst->FrameIdx = frame_idx; + dst->is_long_term = src->long_ref; + dst->not_existing = 0; + dst->used_for_reference = src->reference & 3; + dst->FieldOrderCnt[0] = src->field_poc[0]; + dst->FieldOrderCnt[1] = src->field_poc[1]; +} + +static int nvdec_h264_start_frame(AVCodecContext *avctx, + const uint8_t *buffer, uint32_t size) +{ + const H264Context *h = avctx->priv_data; + const PPS *pps = h->ps.pps; + const SPS *sps = h->ps.sps; + + NVDECContext *ctx = avctx->internal->hwaccel_priv_data; + CUVIDPICPARAMS *pp = &ctx->pic_params; + CUVIDH264PICPARAMS *ppc = &pp->CodecSpecific.h264; + FrameDecodeData *fdd; + NVDECFrame *cf; + + int i, dpb_size, ret; + + ret = ff_nvdec_start_frame(avctx, h->cur_pic_ptr->f); + if (ret < 0) + return ret; + + fdd = (FrameDecodeData*)h->cur_pic_ptr->f->private_ref->data; + cf = (NVDECFrame*)fdd->hwaccel_priv; + + *pp = (CUVIDPICPARAMS) { + .PicWidthInMbs = h->mb_width, + .FrameHeightInMbs = h->mb_height, + .CurrPicIdx = cf->idx, + .field_pic_flag = FIELD_PICTURE(h), + .bottom_field_flag = h->picture_structure == PICT_BOTTOM_FIELD, + .second_field = FIELD_PICTURE(h) && !h->first_field, + .ref_pic_flag = h->nal_ref_idc != 0, + .intra_pic_flag = 1, + + .CodecSpecific.h264 = { + .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 = FFMAX(sps->log2_max_poc_lsb - 4, 0), + .delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag, + .frame_mbs_only_flag = sps->frame_mbs_only_flag, + .direct_8x8_inference_flag = sps->direct_8x8_inference_flag, + .num_ref_frames = sps->ref_frame_count, + .residual_colour_transform_flag = sps->residual_color_transform_flag, + .bit_depth_luma_minus8 = sps->bit_depth_luma - 8, + .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8, + .qpprime_y_zero_transform_bypass_flag = sps->transform_bypass, + + .entropy_coding_mode_flag = pps->cabac, + .pic_order_present_flag = pps->pic_order_present, + .num_ref_idx_l0_active_minus1 = pps->ref_count[0] - 1, + .num_ref_idx_l1_active_minus1 = pps->ref_count[1] - 1, + .weighted_pred_flag = pps->weighted_pred, + .weighted_bipred_idc = pps->weighted_bipred_idc, + .pic_init_qp_minus26 = pps->init_qp - 26, + .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present, + .redundant_pic_cnt_present_flag = pps->redundant_pic_cnt_present, + .transform_8x8_mode_flag = pps->transform_8x8_mode, + .MbaffFrameFlag = sps->mb_aff && !FIELD_PICTURE(h), + .constrained_intra_pred_flag = pps->constrained_intra_pred, + .chroma_qp_index_offset = pps->chroma_qp_index_offset[0], + .second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1], + .ref_pic_flag = h->nal_ref_idc != 0, + .frame_num = h->poc.frame_num, + .CurrFieldOrderCnt[0] = h->cur_pic_ptr->field_poc[0], + .CurrFieldOrderCnt[1] = h->cur_pic_ptr->field_poc[1], + }, + }; + + memcpy(ppc->WeightScale4x4, pps->scaling_matrix4, sizeof(ppc->WeightScale4x4)); + memcpy(ppc->WeightScale8x8[0], pps->scaling_matrix8[0], sizeof(ppc->WeightScale8x8[0])); + memcpy(ppc->WeightScale8x8[1], pps->scaling_matrix8[3], sizeof(ppc->WeightScale8x8[0])); + + dpb_size = 0; + for (i = 0; i < h->short_ref_count; i++) + dpb_add(h, &ppc->dpb[dpb_size++], h->short_ref[i], h->short_ref[i]->frame_num); + for (i = 0; i < 16; i++) { + if (h->long_ref[i]) + dpb_add(h, &ppc->dpb[dpb_size++], h->long_ref[i], i); + } + + for (i = dpb_size; i < FF_ARRAY_ELEMS(ppc->dpb); i++) + ppc->dpb[i].PicIdx = -1; + + return 0; +} + +static int nvdec_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, + uint32_t size) +{ + NVDECContext *ctx = avctx->internal->hwaccel_priv_data; + CUVIDPICPARAMS *pp = &ctx->pic_params; + const H264Context *h = avctx->priv_data; + const H264SliceContext *sl = &h->slice_ctx[0]; + void *tmp; + + tmp = av_fast_realloc(ctx->bitstream, &ctx->bitstream_allocated, + ctx->bitstream_len + size + 3); + if (!tmp) + return AVERROR(ENOMEM); + ctx->bitstream = tmp; + + tmp = av_fast_realloc(ctx->slice_offsets, &ctx->slice_offsets_allocated, + (ctx->nb_slices + 1) * sizeof(*ctx->slice_offsets)); + if (!tmp) + return AVERROR(ENOMEM); + ctx->slice_offsets = tmp; + + AV_WB24(ctx->bitstream + ctx->bitstream_len, 1); + memcpy(ctx->bitstream + ctx->bitstream_len + 3, buffer, size); + ctx->slice_offsets[ctx->nb_slices] = ctx->bitstream_len ; + ctx->bitstream_len += size + 3; + ctx->nb_slices++; + + if (sl->slice_type != AV_PICTURE_TYPE_I && sl->slice_type != AV_PICTURE_TYPE_SI) + pp->intra_pic_flag = 0; + + return 0; +} + +static int nvdec_h264_frame_params(AVCodecContext *avctx, + AVBufferRef *hw_frames_ctx) +{ + const H264Context *h = avctx->priv_data; + const SPS *sps = h->ps.sps; + return ff_nvdec_frame_params(avctx, hw_frames_ctx, sps->ref_frame_count + sps->num_reorder_frames, 0); +} + +const AVHWAccel ff_h264_nvdec_hwaccel = { + .name = "h264_nvdec", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_H264, + .pix_fmt = AV_PIX_FMT_CUDA, + .start_frame = nvdec_h264_start_frame, + .end_frame = ff_nvdec_end_frame, + .decode_slice = nvdec_h264_decode_slice, + .frame_params = nvdec_h264_frame_params, + .init = ff_nvdec_decode_init, + .uninit = ff_nvdec_decode_uninit, + .priv_data_size = sizeof(NVDECContext), +}; 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