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/*
* MPEG-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 "mpegvideo.h"
#include "nvdec.h"
#include "decode.h"
static int get_ref_idx(AVFrame *frame)
{
FrameDecodeData *fdd;
NVDECFrame *cf;
if (!frame || !frame->private_ref)
return -1;
fdd = (FrameDecodeData*)frame->private_ref->data;
cf = (NVDECFrame*)fdd->hwaccel_priv;
if (!cf)
return -1;
return cf->idx;
}
static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
MpegEncContext *s = avctx->priv_data;
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
CUVIDPICPARAMS *pp = &ctx->pic_params;
CUVIDMPEG2PICPARAMS *ppc = &pp->CodecSpecific.mpeg2;
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,
.CodecSpecific.mpeg2 = {
.ForwardRefIdx = get_ref_idx(s->last_picture.f),
.BackwardRefIdx = get_ref_idx(s->next_picture.f),
.picture_coding_type = s->pict_type,
.full_pel_forward_vector = s->full_pel[0],
.full_pel_backward_vector = s->full_pel[1],
.f_code = { { s->mpeg_f_code[0][0],
s->mpeg_f_code[0][1] },
{ s->mpeg_f_code[1][0],
s->mpeg_f_code[1][1] } },
.intra_dc_precision = s->intra_dc_precision,
.frame_pred_frame_dct = s->frame_pred_frame_dct,
.concealment_motion_vectors = s->concealment_motion_vectors,
.q_scale_type = s->q_scale_type,
.intra_vlc_format = s->intra_vlc_format,
.alternate_scan = s->alternate_scan,
.top_field_first = s->top_field_first,
}
};
for (i = 0; i < 64; ++i) {
ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
ppc->QuantMatrixInter[i] = s->inter_matrix[i];
}
return 0;
}
static int nvdec_mpeg12_end_frame(AVCodecContext *avctx)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
int ret = ff_nvdec_end_frame(avctx);
ctx->bitstream = NULL;
return ret;
}
static int nvdec_mpeg12_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
{
NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
void *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;
if (!ctx->bitstream)
ctx->bitstream = (uint8_t*)buffer;
ctx->slice_offsets[ctx->nb_slices] = buffer - ctx->bitstream;
ctx->bitstream_len += size;
ctx->nb_slices++;
return 0;
}
static int nvdec_mpeg12_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);
}
#if CONFIG_MPEG2_NVDEC_HWACCEL
AVHWAccel ff_mpeg2_nvdec_hwaccel = {
.name = "mpeg2_nvdec",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.pix_fmt = AV_PIX_FMT_CUDA,
.start_frame = nvdec_mpeg12_start_frame,
.end_frame = nvdec_mpeg12_end_frame,
.decode_slice = nvdec_mpeg12_decode_slice,
.frame_params = nvdec_mpeg12_frame_params,
.init = ff_nvdec_decode_init,
.uninit = ff_nvdec_decode_uninit,
.priv_data_size = sizeof(NVDECContext),
};
#endif
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