/*
* 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);
}
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),
};