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 "hwaccel_internal.h"
  27 #include "internal.h"
  28 #include "vp8.h"
  29
  30 static unsigned char safe_get_ref_idx(VP8Frame *frame)
  31 {
  32     return frame ? ff_nvdec_get_ref_idx(frame->tf.f) : 255;
  33 }
  34
  35 static int nvdec_vp8_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  36 {
  37     VP8Context *h = avctx->priv_data;
  38
  39     NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
  40     CUVIDPICPARAMS     *pp = &ctx->pic_params;
  41     FrameDecodeData *fdd;
  42     NVDECFrame *cf;
  43     AVFrame *cur_frame = h->framep[VP8_FRAME_CURRENT]->tf.f;
  44
  45     int ret;
  46
  47     ret = ff_nvdec_start_frame(avctx, cur_frame);
  48     if (ret < 0)
  49         return ret;
  50
  51     fdd = (FrameDecodeData*)cur_frame->private_ref->data;
  52     cf  = (NVDECFrame*)fdd->hwaccel_priv;
  53
  54     *pp = (CUVIDPICPARAMS) {
  55         .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
  56         .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
  57         .CurrPicIdx        = cf->idx,
  58
  59         .CodecSpecific.vp8 = {
  60             .width                       = cur_frame->width,
  61             .height                      = cur_frame->height,
  62
  63             .first_partition_size        = h->header_partition_size,
  64
  65             .LastRefIdx                  = safe_get_ref_idx(h->framep[VP8_FRAME_PREVIOUS]),
  66             .GoldenRefIdx                = safe_get_ref_idx(h->framep[VP8_FRAME_GOLDEN]),
  67             .AltRefIdx                   = safe_get_ref_idx(h->framep[VP8_FRAME_ALTREF]),
  68             /*
  69              * Explicit braces for anonymous inners and unnamed fields
  70              * to work around limitations in ancient versions of gcc.
  71              */
  72             { // union
  73                 { // struct
  74                     !h->keyframe,             // frame_type
  75                     h->profile,               // version
  76                     !h->invisible,            // show_frame
  77                     h->segmentation.enabled ? // update_mb_segmentation_data
  78                         h->segmentation.update_feature_data : 0,
  79                 }
  80             }
  81         }
  82     };
  83
  84     return 0;
  85 }
  86
  87 static int nvdec_vp8_frame_params(AVCodecContext *avctx,
  88                                   AVBufferRef *hw_frames_ctx)
  89 {
  90     // VP8 uses a fixed size pool of 3 possible reference frames
  91     return ff_nvdec_frame_params(avctx, hw_frames_ctx, 3, 0);
  92 }
  93
  94 const FFHWAccel ff_vp8_nvdec_hwaccel = {
  95     .p.name               = "vp8_nvdec",
  96     .p.type               = AVMEDIA_TYPE_VIDEO,
  97     .p.id                 = AV_CODEC_ID_VP8,
  98     .p.pix_fmt            = AV_PIX_FMT_CUDA,
  99     .start_frame          = nvdec_vp8_start_frame,
 100     .end_frame            = ff_nvdec_simple_end_frame,
 101     .decode_slice         = ff_nvdec_simple_decode_slice,
 102     .frame_params         = nvdec_vp8_frame_params,
 103     .init                 = ff_nvdec_decode_init,
 104     .uninit               = ff_nvdec_decode_uninit,
 105     .priv_data_size       = sizeof(NVDECContext),
 106 };