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https://github.com/FFmpeg/FFmpeg.git
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122 lines
4.7 KiB
C
122 lines
4.7 KiB
C
/*
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* MPEG-4 Part 2 HW decode acceleration through NVDEC
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*
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* Copyright (c) 2017 Philip Langdale
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "mpeg4video.h"
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#include "nvdec.h"
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#include "decode.h"
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static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
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{
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Mpeg4DecContext *m = avctx->priv_data;
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MpegEncContext *s = &m->m;
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NVDECContext *ctx = avctx->internal->hwaccel_priv_data;
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CUVIDPICPARAMS *pp = &ctx->pic_params;
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CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
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FrameDecodeData *fdd;
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NVDECFrame *cf;
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AVFrame *cur_frame = s->current_picture.f;
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int ret, i;
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ret = ff_nvdec_start_frame(avctx, cur_frame);
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if (ret < 0)
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return ret;
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fdd = (FrameDecodeData*)cur_frame->private_ref->data;
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cf = (NVDECFrame*)fdd->hwaccel_priv;
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*pp = (CUVIDPICPARAMS) {
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.PicWidthInMbs = (cur_frame->width + 15) / 16,
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.FrameHeightInMbs = (cur_frame->height + 15) / 16,
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.CurrPicIdx = cf->idx,
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.intra_pic_flag = s->pict_type == AV_PICTURE_TYPE_I,
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.ref_pic_flag = s->pict_type == AV_PICTURE_TYPE_I ||
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s->pict_type == AV_PICTURE_TYPE_P ||
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s->pict_type == AV_PICTURE_TYPE_S,
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.CodecSpecific.mpeg4 = {
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.ForwardRefIdx = ff_nvdec_get_ref_idx(s->last_picture.f),
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.BackwardRefIdx = ff_nvdec_get_ref_idx(s->next_picture.f),
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.video_object_layer_width = s->width,
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.video_object_layer_height = s->height,
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.vop_time_increment_bitcount = m->time_increment_bits,
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.top_field_first = s->top_field_first,
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.resync_marker_disable = !m->resync_marker,
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.quant_type = s->mpeg_quant,
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.quarter_sample = s->quarter_sample,
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.short_video_header = avctx->codec->id == AV_CODEC_ID_H263,
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.divx_flags = s->divx_packed ? 5 : 0,
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.vop_coding_type = s->pict_type - AV_PICTURE_TYPE_I,
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.vop_coded = 1,
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.vop_rounding_type = s->no_rounding,
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.alternate_vertical_scan_flag = s->alternate_scan,
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.interlaced = !s->progressive_sequence,
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.vop_fcode_forward = s->f_code,
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.vop_fcode_backward = s->b_code,
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.trd = { s->pp_time, s->pp_field_time >> 1 },
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.trb = { s->pb_time, s->pb_field_time >> 1 },
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.gmc_enabled = s->pict_type == AV_PICTURE_TYPE_S &&
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m->vol_sprite_usage == GMC_SPRITE,
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}
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};
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for (i = 0; i < 64; ++i) {
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ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
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ppc->QuantMatrixInter[i] = s->inter_matrix[i];
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}
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// We need to pass the full frame buffer and not just the slice
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return ff_nvdec_simple_decode_slice(avctx, buffer, size);
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}
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static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
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{
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return 0;
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}
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static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
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AVBufferRef *hw_frames_ctx)
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{
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// Each frame can at most have one P and one B reference
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return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2);
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}
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const AVHWAccel ff_mpeg4_nvdec_hwaccel = {
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.name = "mpeg4_nvdec",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MPEG4,
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.pix_fmt = AV_PIX_FMT_CUDA,
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.start_frame = nvdec_mpeg4_start_frame,
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.end_frame = ff_nvdec_simple_end_frame,
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.decode_slice = nvdec_mpeg4_decode_slice,
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.frame_params = nvdec_mpeg4_frame_params,
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.init = ff_nvdec_decode_init,
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.uninit = ff_nvdec_decode_uninit,
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.priv_data_size = sizeof(NVDECContext),
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};
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