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nvdec_mpeg4.c
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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 
34  CUVIDPICPARAMS *pp = &ctx->pic_params;
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 ||
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 &&
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 
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 
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 };
int PicWidthInMbs
IN: Coded frame size in macroblocks.
const struct AVCodec * codec
Definition: avcodec.h:1497
const char * s
Definition: avisynth_c.h:768
S(GMC)-VOP MPEG-4.
Definition: avutil.h:277
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:82
int ff_nvdec_simple_end_frame(AVCodecContext *avctx)
Definition: nvdec.c:493
static int nvdec_mpeg4_frame_params(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx)
Definition: nvdec_mpeg4.c:102
int vol_sprite_usage
Definition: mpeg4video.h:71
uint8_t
CUVIDPICPARAMS pic_params
Definition: nvdec.h:42
AVBufferRef * private_ref
AVBufferRef for internal use by a single libav* library.
Definition: frame.h:578
int ff_nvdec_simple_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: nvdec.c:501
int no_rounding
apply no rounding to motion compensation (MPEG-4, msmpeg4, ...) for B-frames rounding mode is always ...
Definition: mpegvideo.h:281
Picture current_picture
copy of the current picture structure.
Definition: mpegvideo.h:177
uint16_t pp_time
time distance between the last 2 p,s,i frames
Definition: mpegvideo.h:387
ptrdiff_t size
Definition: opengl_enc.c:101
MpegEncContext m
Definition: mpeg4video.h:66
union CUVIDPICPARAMS::@31 CodecSpecific
Picture parameters for decoding This structure is used in cuvidDecodePicture API IN for cuvidDecodePi...
enum AVCodecID id
Definition: avcodec.h:3365
int width
Definition: frame.h:259
static int nvdec_mpeg4_start_frame(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: nvdec_mpeg4.c:28
int ff_nvdec_start_frame(AVCodecContext *avctx, AVFrame *frame)
Definition: nvdec.c:417
int quarter_sample
1->qpel, 0->half pel ME/MC
Definition: mpegvideo.h:396
const AVHWAccel ff_mpeg4_nvdec_hwaccel
Definition: nvdec_mpeg4.c:109
unsigned int idx
Definition: nvdec.h:36
int ff_nvdec_decode_init(AVCodecContext *avctx)
Definition: nvdec.c:263
int ff_nvdec_frame_params(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx, int dpb_size)
Definition: nvdec.c:523
int top_field_first
Definition: mpegvideo.h:460
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3510
int alternate_scan
Definition: mpegvideo.h:465
AVFormatContext * ctx
Definition: movenc.c:48
unsigned char QuantMatrixInter[64]
static int nvdec_mpeg4_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
Definition: nvdec_mpeg4.c:97
HW acceleration through CUDA.
Definition: pixfmt.h:231
uint16_t inter_matrix[64]
Definition: mpegvideo.h:299
MPEG-4 picture parameters This structure is used in CUVIDPICPARAMS structure.
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1488
int ff_nvdec_decode_uninit(AVCodecContext *avctx)
Definition: nvdec.c:245
uint8_t * data
The data buffer.
Definition: buffer.h:89
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:97
int progressive_sequence
Definition: mpegvideo.h:451
unsigned char QuantMatrixIntra[64]
struct AVFrame * f
Definition: mpegpicture.h:46
int f_code
forward MV resolution
Definition: mpegvideo.h:235
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:209
uint16_t pb_field_time
like above, just for interlaced
Definition: mpegvideo.h:390
MpegEncContext.
Definition: mpegvideo.h:78
uint16_t pp_field_time
Definition: mpegvideo.h:389
A reference to a data buffer.
Definition: buffer.h:81
This struct stores per-frame lavc-internal data and is attached to it via private_ref.
Definition: decode.h:37
int ff_nvdec_get_ref_idx(AVFrame *frame)
Definition: nvdec.c:569
void * hwaccel_priv_data
hwaccel-specific private data
Definition: internal.h:188
Picture last_picture
copy of the previous picture structure.
Definition: mpegvideo.h:159
void * priv_data
Definition: avcodec.h:1515
CUVIDMPEG4PICPARAMS mpeg4
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:1523
Picture next_picture
copy of the next picture structure.
Definition: mpegvideo.h:165
int height
Definition: frame.h:259
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:297
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:69
void * hwaccel_priv
Per-frame private data for hwaccels.
Definition: decode.h:55
int b_code
backward MV resolution for B-frames (MPEG-4)
Definition: mpegvideo.h:236
Predicted.
Definition: avutil.h:275
GLuint buffer
Definition: opengl_enc.c:102
uint16_t pb_time
time distance between the last b and p,s,i frame
Definition: mpegvideo.h:388
#define GMC_SPRITE
Definition: mpeg4video.h:51