git.sesse.net Git - ffmpeg/blob - libavcodec/nvdec_mpeg4.c

   1 /*
   2  * MPEG-4 Part 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 "mpeg4video.h"
  25 #include "nvdec.h"
  26 #include "decode.h"
  27
  28 static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  29 {
  30     Mpeg4DecContext *m = avctx->priv_data;
  31     MpegEncContext *s = &m->m;
  32
  33     NVDECContext      *ctx = avctx->internal->hwaccel_priv_data;
  34     CUVIDPICPARAMS     *pp = &ctx->pic_params;
  35     CUVIDMPEG4PICPARAMS *ppc = &pp->CodecSpecific.mpeg4;
  36     FrameDecodeData *fdd;
  37     NVDECFrame *cf;
  38     AVFrame *cur_frame = s->current_picture.f;
  39
  40     int ret, i;
  41
  42     ret = ff_nvdec_start_frame(avctx, cur_frame);
  43     if (ret < 0)
  44         return ret;
  45
  46     fdd = (FrameDecodeData*)cur_frame->private_ref->data;
  47     cf  = (NVDECFrame*)fdd->hwaccel_priv;
  48
  49     *pp = (CUVIDPICPARAMS) {
  50         .PicWidthInMbs     = (cur_frame->width  + 15) / 16,
  51         .FrameHeightInMbs  = (cur_frame->height + 15) / 16,
  52         .CurrPicIdx        = cf->idx,
  53
  54         .intra_pic_flag    = s->pict_type == AV_PICTURE_TYPE_I,
  55         .ref_pic_flag      = s->pict_type == AV_PICTURE_TYPE_I ||
  56                              s->pict_type == AV_PICTURE_TYPE_P ||
  57                              s->pict_type == AV_PICTURE_TYPE_S,
  58
  59         .CodecSpecific.mpeg4 = {
  60             .ForwardRefIdx                = ff_nvdec_get_ref_idx(s->last_picture.f),
  61             .BackwardRefIdx               = ff_nvdec_get_ref_idx(s->next_picture.f),
  62
  63             .video_object_layer_width     = s->width,
  64             .video_object_layer_height    = s->height,
  65             .vop_time_increment_bitcount  = m->time_increment_bits,
  66             .top_field_first              = s->top_field_first,
  67             .resync_marker_disable        = !m->resync_marker,
  68             .quant_type                   = s->mpeg_quant,
  69             .quarter_sample               = s->quarter_sample,
  70             .short_video_header           = avctx->codec->id == AV_CODEC_ID_H263,
  71             .divx_flags                   = s->divx_packed ? 5 : 0,
  72
  73             .vop_coding_type              = s->pict_type - AV_PICTURE_TYPE_I,
  74             .vop_coded                    = 1,
  75             .vop_rounding_type            = s->no_rounding,
  76             .alternate_vertical_scan_flag = s->alternate_scan,
  77             .interlaced                   = !s->progressive_sequence,
  78             .vop_fcode_forward            = s->f_code,
  79             .vop_fcode_backward           = s->b_code,
  80             .trd                          = { s->pp_time, s->pp_field_time >> 1 },
  81             .trb                          = { s->pb_time, s->pb_field_time >> 1 },
  82
  83             .gmc_enabled                  = s->pict_type == AV_PICTURE_TYPE_S &&
  84                                             m->vol_sprite_usage == GMC_SPRITE,
  85         }
  86     };
  87
  88     for (i = 0; i < 64; ++i) {
  89         ppc->QuantMatrixIntra[i] = s->intra_matrix[i];
  90         ppc->QuantMatrixInter[i] = s->inter_matrix[i];
  91     }
  92
  93     // We need to pass the full frame buffer and not just the slice
  94     return ff_nvdec_simple_decode_slice(avctx, buffer, size);
  95 }
  96
  97 static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
  98 {
  99     return 0;
 100 }
 101
 102 static int nvdec_mpeg4_frame_params(AVCodecContext *avctx,
 103                                   AVBufferRef *hw_frames_ctx)
 104 {
 105     // Each frame can at most have one P and one B reference
 106     return ff_nvdec_frame_params(avctx, hw_frames_ctx, 2);
 107 }
 108
 109 const AVHWAccel ff_mpeg4_nvdec_hwaccel = {
 110     .name                 = "mpeg4_nvdec",
 111     .type                 = AVMEDIA_TYPE_VIDEO,
 112     .id                   = AV_CODEC_ID_MPEG4,
 113     .pix_fmt              = AV_PIX_FMT_CUDA,
 114     .start_frame          = nvdec_mpeg4_start_frame,
 115     .end_frame            = ff_nvdec_simple_end_frame,
 116     .decode_slice         = nvdec_mpeg4_decode_slice,
 117     .frame_params         = nvdec_mpeg4_frame_params,
 118     .init                 = ff_nvdec_decode_init,
 119     .uninit               = ff_nvdec_decode_uninit,
 120     .priv_data_size       = sizeof(NVDECContext),
 121 };