git.sesse.net Git - ffmpeg/blob - libavcodec/nvdec_mpeg12.c

   1 /*
   2  * MPEG-1/2 HW decode acceleration through NVDEC
   3  *
   4  * Copyright (c) 2017 Philip Langdale
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "avcodec.h"
  24 #include "mpegvideo.h"
  25 #include "nvdec.h"
  26 #include "decode.h"
  27
  28 static int nvdec_mpeg12_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  29 {
  30     MpegEncContext *s = avctx->priv_data;
  31
  32     NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
  33     CUVIDPICPARAMS     *pp = &ctx->pic_params;
  34     CUVIDMPEG2PICPARAMS *ppc = &pp->CodecSpecific.mpeg2;
  35     FrameDecodeData *fdd;
  36     NVDECFrame *cf;
  37     AVFrame *cur_frame = s->current_picture.f;
  38
  39     int ret, i;
  40
  41     ret = ff_nvdec_start_frame(avctx, cur_frame);
  42     if (ret < 0)
  43         return ret;
  44
  45     fdd = (FrameDecodeData*)cur_frame->private_ref->data;
  46     cf  = (NVDECFrame*)fdd->hwaccel_priv;
  47
  48     *pp = (CUVIDPICPARAMS) {
  49         .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
  50         .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
  51         .CurrPicIdx        = cf->idx,
  52
  53         .intra_pic_flag    = s->pict_type == AV_PICTURE_TYPE_I,
  54         .ref_pic_flag      = s->pict_type == AV_PICTURE_TYPE_I ||
  55                              s->pict_type == AV_PICTURE_TYPE_P,
  56
  57         .CodecSpecific.mpeg2 = {
  58             .ForwardRefIdx     = ff_nvdec_get_ref_idx(s->last_picture.f),
  59             .BackwardRefIdx    = ff_nvdec_get_ref_idx(s->next_picture.f),
  60
  61             .picture_coding_type        = s->pict_type,
  62             .full_pel_forward_vector    = s->full_pel[0],
  63             .full_pel_backward_vector   = s->full_pel[1],
  64             .f_code                     = { { s->mpeg_f_code[0][0],
  65                                               s->mpeg_f_code[0][1] },
  66                                             { s->mpeg_f_code[1][0],
  67                                               s->mpeg_f_code[1][1] } },
  68             .intra_dc_precision         = s->intra_dc_precision,
  69             .frame_pred_frame_dct       = s->frame_pred_frame_dct,
  70             .concealment_motion_vectors = s->concealment_motion_vectors,
  71             .q_scale_type               = s->q_scale_type,
  72             .intra_vlc_format           = s->intra_vlc_format,
  73             .alternate_scan             = s->alternate_scan,
  74             .top_field_first            = s->top_field_first,
  75         }
  76     };
  77
  78     for (i = 0; i < 64; ++i) {
  79         ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
  80         ppc->QuantMatrixInter[i] = s->inter_matrix[i];
  81     }
  82
  83     return 0;
  84 }
  85
  86 static int nvdec_mpeg12_frame_params(AVCodecContext *avctx,
  87                                   AVBufferRef *hw_frames_ctx)
  88 {
  89     // Each frame can at most have one P and one B reference
  90     return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2);
  91 }
  92
  93 #if CONFIG_MPEG2_NVDEC_HWACCEL
  94 const AVHWAccel ff_mpeg2_nvdec_hwaccel = {
  95     .name                 = "mpeg2_nvdec",
  96     .type                 = AVMEDIA_TYPE_VIDEO,
  97     .id                   = AV_CODEC_ID_MPEG2VIDEO,
  98     .pix_fmt              = AV_PIX_FMT_CUDA,
  99     .start_frame          = nvdec_mpeg12_start_frame,
 100     .end_frame            = ff_nvdec_simple_end_frame,
 101     .decode_slice         = ff_nvdec_simple_decode_slice,
 102     .frame_params         = nvdec_mpeg12_frame_params,
 103     .init                 = ff_nvdec_decode_init,
 104     .uninit               = ff_nvdec_decode_uninit,
 105     .priv_data_size       = sizeof(NVDECContext),
 106 };
 107 #endif
 108
 109 #if CONFIG_MPEG1_NVDEC_HWACCEL
 110 const AVHWAccel ff_mpeg1_nvdec_hwaccel = {
 111     .name                 = "mpeg1_nvdec",
 112     .type                 = AVMEDIA_TYPE_VIDEO,
 113     .id                   = AV_CODEC_ID_MPEG1VIDEO,
 114     .pix_fmt              = AV_PIX_FMT_CUDA,
 115     .start_frame          = nvdec_mpeg12_start_frame,
 116     .end_frame            = ff_nvdec_simple_end_frame,
 117     .decode_slice         = ff_nvdec_simple_decode_slice,
 118     .frame_params         = nvdec_mpeg12_frame_params,
 119     .init                 = ff_nvdec_decode_init,
 120     .uninit               = ff_nvdec_decode_uninit,
 121     .priv_data_size       = sizeof(NVDECContext),
 122 };
 123 #endif