FFmpeg
libuavs3d.c
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1 /*
2  * AVS3-P2/IEEE1857.10 video decoder (using the uavs3d library)
3  * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn>
4  * Bingjie Han <hanbj@pkusz.edu.cn>
5  * Huiwen Ren <hwrenx@gmail.com>
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "libavutil/avutil.h"
25 #include "libavutil/common.h"
26 #include "libavutil/cpu.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/opt.h"
30 #include "avcodec.h"
31 #include "avs3.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "uavs3d.h"
35 
36 typedef struct uavs3d_context {
38  void *dec_handle;
41  uavs3d_io_frm_t dec_frame;
43 
44 #define UAVS3D_CHECK_START_CODE(data_ptr, PIC_START_CODE) \
45  (AV_RL32(data_ptr) != (PIC_START_CODE << 24) + AVS3_NAL_START_CODE)
46 static int uavs3d_find_next_start_code(const unsigned char *bs_data, int bs_len, int *left)
47 {
48  const unsigned char *data_ptr = bs_data + 4;
49  int count = bs_len - 4;
50 
51  while (count >= 4 &&
57  data_ptr++;
58  count--;
59  }
60 
61  if (count >= 4) {
62  *left = count;
63  return 1;
64  }
65 
66  return 0;
67 }
68 
69 static void uavs3d_output_callback(uavs3d_io_frm_t *dec_frame) {
70  uavs3d_io_frm_t frm_out;
71  AVFrame *frm = (AVFrame *)dec_frame->priv;
72  int i;
73 
74  if (!frm || !frm->data[0]) {
75  dec_frame->got_pic = 0;
76  av_log(NULL, AV_LOG_ERROR, "Invalid AVFrame in uavs3d output.\n");
77  return;
78  }
79 
80  frm->pts = dec_frame->pts;
81  frm->pkt_dts = dec_frame->dts;
82 #if FF_API_FRAME_PKT
84  frm->pkt_pos = dec_frame->pkt_pos;
85  frm->pkt_size = dec_frame->pkt_size;
87 #endif
88 
89  if (dec_frame->type < 0 || dec_frame->type >= FF_ARRAY_ELEMS(ff_avs3_image_type)) {
90  av_log(NULL, AV_LOG_WARNING, "Error frame type in uavs3d: %d.\n", dec_frame->type);
91  } else {
92  frm->pict_type = ff_avs3_image_type[dec_frame->type];
93  if (frm->pict_type == AV_PICTURE_TYPE_I)
94  frm->flags |= AV_FRAME_FLAG_KEY;
95  else
96  frm->flags &= ~AV_FRAME_FLAG_KEY;
97  }
98 
99  for (i = 0; i < 3; i++) {
100  frm_out.width [i] = dec_frame->width[i];
101  frm_out.height[i] = dec_frame->height[i];
102  frm_out.stride[i] = frm->linesize[i];
103  frm_out.buffer[i] = frm->data[i];
104  }
105 
106  uavs3d_img_cpy_cvt(&frm_out, dec_frame, dec_frame->bit_depth);
107 }
108 
110 {
111  uavs3d_context *h = avctx->priv_data;
112  uavs3d_cfg_t cdsc;
113 
114  cdsc.frm_threads = avctx->thread_count > 0 ? avctx->thread_count : av_cpu_count();
115  cdsc.check_md5 = 0;
116  h->dec_handle = uavs3d_create(&cdsc, uavs3d_output_callback, NULL);
117  h->got_seqhdr = 0;
118 
119  if (!h->dec_handle) {
120  return AVERROR(ENOMEM);
121  }
122 
123  return 0;
124 }
125 
127 {
128  uavs3d_context *h = avctx->priv_data;
129 
130  if (h->dec_handle) {
131  uavs3d_flush(h->dec_handle, NULL);
132  uavs3d_delete(h->dec_handle);
133  h->dec_handle = NULL;
134  }
135  h->got_seqhdr = 0;
136 
137  return 0;
138 }
139 
140 static void libuavs3d_flush(AVCodecContext * avctx)
141 {
142  uavs3d_context *h = avctx->priv_data;
143 
144  if (h->dec_handle) {
145  uavs3d_reset(h->dec_handle);
146  }
147 }
148 
149 #define UAVS3D_CHECK_INVALID_RANGE(v, l, r) ((v)<(l)||(v)>(r))
151  int *got_frame, AVPacket *avpkt)
152 {
153  uavs3d_context *h = avctx->priv_data;
154  const uint8_t *buf = avpkt->data;
155  int buf_size = avpkt->size;
156  const uint8_t *buf_end;
157  const uint8_t *buf_ptr = buf;
158  int left_bytes;
159  int ret, finish = 0;
160 
161  *got_frame = 0;
162  frm->pts = -1;
164 
165  if (!buf_size) {
166  if (h->got_seqhdr) {
167  if (!frm->data[0] && (ret = ff_get_buffer(avctx, frm, 0)) < 0) {
168  return ret;
169  }
170  h->dec_frame.priv = frm; // AVFrame
171  }
172  do {
173  ret = uavs3d_flush(h->dec_handle, &h->dec_frame);
174  } while (ret > 0 && !h->dec_frame.got_pic);
175  } else {
176  uavs3d_io_frm_t *frm_dec = &h->dec_frame;
177 
178  buf_end = buf + buf_size;
179 #if FF_API_FRAME_PKT
181  frm_dec->pkt_pos = avpkt->pos;
182  frm_dec->pkt_size = avpkt->size;
184 #endif
185 
186  while (!finish) {
187  int bs_len;
188 
189  if (h->got_seqhdr) {
190  if (!frm->data[0] && (ret = ff_get_buffer(avctx, frm, 0)) < 0) {
191  return ret;
192  }
193  h->dec_frame.priv = frm; // AVFrame
194  }
195 
196  if (uavs3d_find_next_start_code(buf_ptr, buf_end - buf_ptr, &left_bytes)) {
197  bs_len = buf_end - buf_ptr - left_bytes;
198  } else {
199  bs_len = buf_end - buf_ptr;
200  finish = 1;
201  }
202  frm_dec->bs = (unsigned char *)buf_ptr;
203  frm_dec->bs_len = bs_len;
204  frm_dec->pts = avpkt->pts;
205  frm_dec->dts = avpkt->dts;
206  uavs3d_decode(h->dec_handle, frm_dec);
207  buf_ptr += bs_len;
208 
209  if (frm_dec->nal_type == NAL_SEQ_HEADER) {
210  struct uavs3d_com_seqh_t *seqh = frm_dec->seqhdr;
211  if (UAVS3D_CHECK_INVALID_RANGE(seqh->frame_rate_code, 0, 15)) {
212  av_log(avctx, AV_LOG_ERROR, "Invalid frame rate code: %d.\n", seqh->frame_rate_code);
213  seqh->frame_rate_code = 3; // default 25 fps
214  } else {
215  avctx->framerate.num = ff_avs3_frame_rate_tab[seqh->frame_rate_code].num;
216  avctx->framerate.den = ff_avs3_frame_rate_tab[seqh->frame_rate_code].den;
217  }
218  avctx->has_b_frames = seqh->output_reorder_delay;
219  avctx->pix_fmt = seqh->bit_depth_internal == 8 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUV420P10LE;
220  ret = ff_set_dimensions(avctx, seqh->horizontal_size, seqh->vertical_size);
221  if (ret < 0)
222  return ret;
223  h->got_seqhdr = 1;
224 
225  if (seqh->colour_description) {
226  if (UAVS3D_CHECK_INVALID_RANGE(seqh->colour_primaries, 0, 9) ||
227  UAVS3D_CHECK_INVALID_RANGE(seqh->transfer_characteristics, 0, 14) ||
228  UAVS3D_CHECK_INVALID_RANGE(seqh->matrix_coefficients, 0, 11)) {
229  av_log(avctx, AV_LOG_ERROR,
230  "Invalid colour description: primaries: %d"
231  "transfer characteristics: %d"
232  "matrix coefficients: %d.\n",
233  seqh->colour_primaries,
234  seqh->transfer_characteristics,
235  seqh->matrix_coefficients);
236  } else {
237  avctx->color_primaries = ff_avs3_color_primaries_tab[seqh->colour_primaries];
238  avctx->color_trc = ff_avs3_color_transfer_tab [seqh->transfer_characteristics];
239  avctx->colorspace = ff_avs3_color_matrix_tab [seqh->matrix_coefficients];
240  }
241  }
242  }
243  if (frm_dec->got_pic) {
244  break;
245  }
246  }
247  }
248 
249  *got_frame = h->dec_frame.got_pic;
250 
251  if (!(*got_frame)) {
252  av_frame_unref(frm);
253  }
254 
255  return buf_ptr - buf;
256 }
257 
259  .p.name = "libuavs3d",
260  CODEC_LONG_NAME("libuavs3d AVS3-P2/IEEE1857.10"),
261  .p.type = AVMEDIA_TYPE_VIDEO,
262  .p.id = AV_CODEC_ID_AVS3,
263  .priv_data_size = sizeof(uavs3d_context),
264  .init = libuavs3d_init,
265  .close = libuavs3d_end,
268  .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE |
270  .flush = libuavs3d_flush,
271  .p.wrapper_name = "libuavs3d",
272 };
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:685
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:678
uavs3d_context::dec_frame
uavs3d_io_frm_t dec_frame
Definition: libuavs3d.c:41
AVPacket::data
uint8_t * data
Definition: packet.h:520
UAVS3D_CHECK_INVALID_RANGE
#define UAVS3D_CHECK_INVALID_RANGE(v, l, r)
Definition: libuavs3d.c:149
FF_CODEC_CAP_NOT_INIT_THREADSAFE
#define FF_CODEC_CAP_NOT_INIT_THREADSAFE
The codec is not known to be init-threadsafe (i.e.
Definition: codec_internal.h:34
uavs3d_output_callback
static void uavs3d_output_callback(uavs3d_io_frm_t *dec_frame)
Definition: libuavs3d.c:69
FFCodec
Definition: codec_internal.h:126
AVFrame::flags
int flags
Frame flags, a combination of AV_FRAME_FLAGS.
Definition: frame.h:646
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:94
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:560
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
finish
static void finish(void)
Definition: movenc.c:373
uavs3d_context::got_seqhdr
int got_seqhdr
Definition: libuavs3d.c:40
libuavs3d_decode_frame
static int libuavs3d_decode_frame(AVCodecContext *avctx, AVFrame *frm, int *got_frame, AVPacket *avpkt)
Definition: libuavs3d.c:150
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1583
uavs3d_context
Definition: libuavs3d.c:36
AVRational::num
int num
Numerator.
Definition: rational.h:59
AV_PIX_FMT_YUV420P10LE
@ AV_PIX_FMT_YUV420P10LE
planar YUV 4:2:0, 15bpp, (1 Cr & Cb sample per 2x2 Y samples), little-endian
Definition: pixfmt.h:156
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:671
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
AV_FRAME_FLAG_KEY
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
Definition: frame.h:625
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:723
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
intreadwrite.h
AVS3_INTRA_PIC_START_CODE
#define AVS3_INTRA_PIC_START_CODE
Definition: avs3.h:30
AV_CODEC_CAP_OTHER_THREADS
#define AV_CODEC_CAP_OTHER_THREADS
Codec supports multithreading through a method other than slice- or frame-level multithreading.
Definition: codec.h:124
decode.h
AVFrame::pkt_size
attribute_deprecated int pkt_size
size of the corresponding packet containing the compressed frame.
Definition: frame.h:718
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
if
if(ret)
Definition: filter_design.txt:179
AV_CODEC_ID_AVS3
@ AV_CODEC_ID_AVS3
Definition: codec_id.h:248
libuavs3d_flush
static void libuavs3d_flush(AVCodecContext *avctx)
Definition: libuavs3d.c:140
ff_avs3_color_matrix_tab
static const int ff_avs3_color_matrix_tab[12]
Definition: avs3.h:96
NULL
#define NULL
Definition: coverity.c:32
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
AVFrame::pkt_dts
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:493
uavs3d_context::frame_threads
int frame_threads
Definition: libuavs3d.c:39
ff_avs3_color_primaries_tab
static const int ff_avs3_color_primaries_tab[10]
Definition: avs3.h:65
av_cpu_count
int av_cpu_count(void)
Definition: cpu.c:211
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1575
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:476
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:521
codec_internal.h
cpu.h
AVFrame::pkt_pos
attribute_deprecated int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:684
ff_avs3_frame_rate_tab
static const AVRational ff_avs3_frame_rate_tab[16]
Definition: avs3.h:46
AV_PICTURE_TYPE_NONE
@ AV_PICTURE_TYPE_NONE
Undefined.
Definition: avutil.h:278
ff_avs3_image_type
static enum AVPictureType ff_avs3_image_type[4]
Definition: avs3.h:111
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:519
uavs3d_context::dec_handle
void * dec_handle
Definition: libuavs3d.c:38
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:513
common.h
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
avcodec.h
ff_avs3_color_transfer_tab
static const int ff_avs3_color_transfer_tab[15]
Definition: avs3.h:78
ret
ret
Definition: filter_design.txt:187
AVS3_SEQ_START_CODE
#define AVS3_SEQ_START_CODE
Definition: avs3.h:27
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVRational::den
int den
Denominator.
Definition: rational.h:60
avs3.h
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:76
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
UAVS3D_CHECK_START_CODE
#define UAVS3D_CHECK_START_CODE(data_ptr, PIC_START_CODE)
Definition: libuavs3d.c:44
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
avutil.h
uavs3d_find_next_start_code
static int uavs3d_find_next_start_code(const unsigned char *bs_data, int bs_len, int *left)
Definition: libuavs3d.c:46
FF_CODEC_CAP_AUTO_THREADS
#define FF_CODEC_CAP_AUTO_THREADS
Codec handles avctx->thread_count == 0 (auto) internally.
Definition: codec_internal.h:72
libuavs3d_init
static av_cold int libuavs3d_init(AVCodecContext *avctx)
Definition: libuavs3d.c:109
AVS3_SEQ_END_CODE
#define AVS3_SEQ_END_CODE
Definition: avs3.h:28
AVPacket
This structure stores compressed data.
Definition: packet.h:497
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:540
ff_libuavs3d_decoder
const FFCodec ff_libuavs3d_decoder
Definition: libuavs3d.c:258
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
h
h
Definition: vp9dsp_template.c:2038
AVS3_FIRST_SLICE_START_CODE
#define AVS3_FIRST_SLICE_START_CODE
Definition: avs3.h:35
AVS3_INTER_PIC_START_CODE
#define AVS3_INTER_PIC_START_CODE
Definition: avs3.h:33
uavs3d_context::avctx
AVCodecContext * avctx
Definition: libuavs3d.c:37
libuavs3d_end
static av_cold int libuavs3d_end(AVCodecContext *avctx)
Definition: libuavs3d.c:126