git.sesse.net Git - ffmpeg/blob - libavcodec/nvdec_vp8.c

   1 /*
   2  * VP8 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 "nvdec.h"
  25 #include "decode.h"
  26 #include "internal.h"
  27 #include "vp8.h"
  28
  29 static unsigned char safe_get_ref_idx(VP8Frame *frame)
  30 {
  31     return frame ? ff_nvdec_get_ref_idx(frame->tf.f) : 255;
  32 }
  33
  34 static int nvdec_vp8_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  35 {
  36     VP8Context *h = avctx->priv_data;
  37
  38     NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
  39     CUVIDPICPARAMS     *pp = &ctx->pic_params;
  40     FrameDecodeData *fdd;
  41     NVDECFrame *cf;
  42     AVFrame *cur_frame = h->framep[VP56_FRAME_CURRENT]->tf.f;
  43
  44     int ret;
  45
  46     ret = ff_nvdec_start_frame(avctx, cur_frame);
  47     if (ret < 0)
  48         return ret;
  49
  50     fdd = (FrameDecodeData*)cur_frame->private_ref->data;
  51     cf  = (NVDECFrame*)fdd->hwaccel_priv;
  52
  53     *pp = (CUVIDPICPARAMS) {
  54         .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
  55         .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
  56         .CurrPicIdx        = cf->idx,
  57
  58         .CodecSpecific.vp8 = {
  59             .width                       = cur_frame->width,
  60             .height                      = cur_frame->height,
  61
  62             .first_partition_size        = h->header_partition_size,
  63
  64             .LastRefIdx                  = safe_get_ref_idx(h->framep[VP56_FRAME_PREVIOUS]),
  65             .GoldenRefIdx                = safe_get_ref_idx(h->framep[VP56_FRAME_GOLDEN]),
  66             .AltRefIdx                   = safe_get_ref_idx(h->framep[VP56_FRAME_GOLDEN2]),
  67             /*
  68              * Explicit braces for anonymous inners and unnamed fields
  69              * to work around limitations in ancient versions of gcc.
  70              */
  71             { // union
  72                 { // struct
  73                     !h->keyframe,             // frame_type
  74                     h->profile,               // version
  75                     !h->invisible,            // show_frame
  76                     h->segmentation.enabled ? // update_mb_segmentation_data
  77                         h->segmentation.update_feature_data : 0,
  78                 }
  79             }
  80         }
  81     };
  82
  83     return 0;
  84 }
  85
  86 static int nvdec_vp8_frame_params(AVCodecContext *avctx,
  87                                   AVBufferRef *hw_frames_ctx)
  88 {
  89     // VP8 uses a fixed size pool of 3 possible reference frames
  90     return ff_nvdec_frame_params(avctx, hw_frames_ctx, 3, 0);
  91 }
  92
  93 AVHWAccel ff_vp8_nvdec_hwaccel = {
  94     .name                 = "vp8_nvdec",
  95     .type                 = AVMEDIA_TYPE_VIDEO,
  96     .id                   = AV_CODEC_ID_VP8,
  97     .pix_fmt              = AV_PIX_FMT_CUDA,
  98     .start_frame          = nvdec_vp8_start_frame,
  99     .end_frame            = ff_nvdec_simple_end_frame,
 100     .decode_slice         = ff_nvdec_simple_decode_slice,
 101     .frame_params         = nvdec_vp8_frame_params,
 102     .init                 = ff_nvdec_decode_init,
 103     .uninit               = ff_nvdec_decode_uninit,
 104     .priv_data_size       = sizeof(NVDECContext),
 105 };