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/*
* MPEG-4 Part 2 HW decode acceleration through NVDEC
*
* Copyright (c) 2017 Philip Langdale
*
* 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 "avcodec.h"
#include "mpeg4video.h"
#include "nvdec.h"
#include "decode.h"
static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
Mpeg4DecContext *m = avctx->priv_data;
MpegEncContext *s = &m->m;
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
CUVIDPICPARAMS *pp = &ctx->pic_params;
CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
FrameDecodeData *fdd;
NVDECFrame *cf;
AVFrame *cur_frame = s->current_picture.f;
int ret, i;
ret = ff_nvdec_start_frame(avctx, cur_frame);
if (ret < 0)
return ret;
fdd = (FrameDecodeData*)cur_frame->private_ref->data;
cf = (NVDECFrame*)fdd->hwaccel_priv;
*pp = (CUVIDPICPARAMS) {
.PicWidthInMbs = (cur_frame->width + 15) / 16,
.FrameHeightInMbs = (cur_frame->height + 15) / 16,
.CurrPicIdx = cf->idx,
.intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
.ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_S,
.CodecSpecific.mpeg4 = {
.ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
.BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
.video_object_layer_width = s->width,
.video_object_layer_height = s->height,
.vop_time_increment_bitcount = m->time_increment_bits,
.top_field_first = s->top_field_first,
.resync_marker_disable = !m->resync_marker,
.quant_type = s->mpeg_quant,
.quarter_sample = s->quarter_sample,
.short_video_header = avctx->codec->id == AV_CODEC_ID_H263,
.divx_flags = s->divx_packed ? 5 : 0,
.vop_coding_type = s->pict_type - AV_PICTURE_TYPE_I,
.vop_coded = 1,
.vop_rounding_type = s->no_rounding,
.alternate_vertical_scan_flag = s->alternate_scan,
.interlaced = !s->progressive_sequence,
.vop_fcode_forward = s->f_code,
.vop_fcode_backward = s->b_code,
.trd = { s->pp_time, s->pp_field_time >> 1 },
.trb = { s->pb_time, s->pb_field_time >> 1 },
.gmc_enabled = s->pict_type == AV_PICTURE_TYPE_S &&
m->vol_sprite_usage == GMC_SPRITE,
}
};
for (i = 0; i < 64; ++i) {
int n = s->idsp.idct_permutation[i];
ppc->QuantMatrixIntra[i] = s->intra_matrix[n];
ppc->QuantMatrixInter[i] = s->inter_matrix[n];
}
// We need to pass the full frame buffer and not just the slice
return ff_nvdec_simple_decode_slice(avctx, buffer, size);
}
static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
return 0;
}
static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
AVBufferRef *hw_frames_ctx)
{
// Each frame can at most have one P and one B reference
return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2, 0);
}
const AVHWAccel ff_mpeg4_nvdec_hwaccel = {
.name = "mpeg4_nvdec",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG4,
.pix_fmt = AV_PIX_FMT_CUDA,
.start_frame = nvdec_mpeg4_start_frame,
.end_frame = ff_nvdec_simple_end_frame,
.decode_slice = nvdec_mpeg4_decode_slice,
.frame_params = nvdec_mpeg4_frame_params,
.init = ff_nvdec_decode_init,
.uninit = ff_nvdec_decode_uninit,
.priv_data_size = sizeof(NVDECContext),
};
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