FFmpeg
vsrc_mptestsrc.c
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1 /*
2  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20 
21 /**
22  * @file
23  * MP test source, ported from MPlayer libmpcodecs/vf_test.c
24  */
25 
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "avfilter.h"
29 #include "internal.h"
30 #include "video.h"
31 
32 #define WIDTH 512
33 #define HEIGHT 512
34 
35 enum test_type {
48 };
49 
50 typedef struct MPTestContext {
51  const AVClass *class;
53  int64_t pts, max_pts, duration;
54  int64_t max_frames;
55  int hsub, vsub;
56  int test; ///< test_type
58 
59 #define OFFSET(x) offsetof(MPTestContext, x)
60 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
61 static const AVOption mptestsrc_options[]= {
62  { "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
63  { "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, FLAGS },
64  { "duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
65  { "d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = -1}, -1, INT64_MAX, FLAGS },
66 
67  { "test", "set test to perform", OFFSET(test), AV_OPT_TYPE_INT, {.i64=TEST_ALL}, 0, INT_MAX, FLAGS, .unit = "test" },
68  { "t", "set test to perform", OFFSET(test), AV_OPT_TYPE_INT, {.i64=TEST_ALL}, 0, INT_MAX, FLAGS, .unit = "test" },
69  { "dc_luma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_DC_LUMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
70  { "dc_chroma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_DC_CHROMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
71  { "freq_luma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_FREQ_LUMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
72  { "freq_chroma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_FREQ_CHROMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
73  { "amp_luma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_AMP_LUMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
74  { "amp_chroma", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_AMP_CHROMA}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
75  { "cbp", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_CBP}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
76  { "mv", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_MV}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
77  { "ring1", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_RING1}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
78  { "ring2", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_RING2}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
79  { "all", "", 0, AV_OPT_TYPE_CONST, {.i64=TEST_ALL}, INT_MIN, INT_MAX, FLAGS, .unit = "test" },
80  { "max_frames", "Set the maximum number of frames generated for each test", OFFSET(max_frames),
81  AV_OPT_TYPE_INT64, {.i64 = 30}, 1, INT64_MAX, FLAGS },
82  { "m", "Set the maximum number of frames generated for each test", OFFSET(max_frames),
83  AV_OPT_TYPE_INT64, {.i64 = 30}, 1, INT64_MAX, FLAGS },
84  { NULL }
85 };
86 
87 AVFILTER_DEFINE_CLASS(mptestsrc);
88 
89 static double c[64];
90 
91 static void init_idct(void)
92 {
93  int i, j;
94 
95  for (i = 0; i < 8; i++) {
96  double s = i == 0 ? sqrt(0.125) : 0.5;
97 
98  for (j = 0; j < 8; j++)
99  c[i*8+j] = s*cos((M_PI/8.0)*i*(j+0.5));
100  }
101 }
102 
103 static void idct(uint8_t *dst, int dst_linesize, int src[64])
104 {
105  int i, j, k;
106  double tmp[64];
107 
108  for (i = 0; i < 8; i++) {
109  for (j = 0; j < 8; j++) {
110  double sum = 0.0;
111 
112  for (k = 0; k < 8; k++)
113  sum += c[k*8+j] * src[8*i+k];
114 
115  tmp[8*i+j] = sum;
116  }
117  }
118 
119  for (j = 0; j < 8; j++) {
120  for (i = 0; i < 8; i++) {
121  double sum = 0.0;
122 
123  for (k = 0; k < 8; k++)
124  sum += c[k*8+i]*tmp[8*k+j];
125 
126  dst[dst_linesize*i + j] = av_clip_uint8(lrint(sum));
127  }
128  }
129 }
130 
131 static void draw_dc(uint8_t *dst, int dst_linesize, int color, int w, int h)
132 {
133  int x, y;
134 
135  for (y = 0; y < h; y++)
136  for (x = 0; x < w; x++)
137  dst[x + y*dst_linesize] = color;
138 }
139 
140 static void draw_basis(uint8_t *dst, int dst_linesize, int amp, int freq, int dc)
141 {
142  int src[64];
143 
144  memset(src, 0, 64*sizeof(int));
145  src[0] = dc;
146  if (amp)
147  src[freq] = amp;
148  idct(dst, dst_linesize, src);
149 }
150 
151 static void draw_cbp(uint8_t *dst[3], int dst_linesize[3], int cbp, int amp, int dc)
152 {
153  if (cbp&1) draw_basis(dst[0] , dst_linesize[0], amp, 1, dc);
154  if (cbp&2) draw_basis(dst[0]+8 , dst_linesize[0], amp, 1, dc);
155  if (cbp&4) draw_basis(dst[0]+ 8*dst_linesize[0], dst_linesize[0], amp, 1, dc);
156  if (cbp&8) draw_basis(dst[0]+8+8*dst_linesize[0], dst_linesize[0], amp, 1, dc);
157  if (cbp&16) draw_basis(dst[1] , dst_linesize[1], amp, 1, dc);
158  if (cbp&32) draw_basis(dst[2] , dst_linesize[2], amp, 1, dc);
159 }
160 
161 static void dc_test(uint8_t *dst, int dst_linesize, int w, int h, int off)
162 {
163  const int step = FFMAX(256/(w*h/256), 1);
164  int x, y, color = off;
165 
166  for (y = 0; y < h; y += 16) {
167  for (x = 0; x < w; x += 16) {
168  draw_dc(dst + x + y*dst_linesize, dst_linesize, color, 8, 8);
169  color += step;
170  }
171  }
172 }
173 
174 static void freq_test(uint8_t *dst, int dst_linesize, int off)
175 {
176  int x, y, freq = 0;
177 
178  for (y = 0; y < 8*16; y += 16) {
179  for (x = 0; x < 8*16; x += 16) {
180  draw_basis(dst + x + y*dst_linesize, dst_linesize, 4*(96+off), freq, 128*8);
181  freq++;
182  }
183  }
184 }
185 
186 static void amp_test(uint8_t *dst, int dst_linesize, int off)
187 {
188  int x, y, amp = off;
189 
190  for (y = 0; y < 16*16; y += 16) {
191  for (x = 0; x < 16*16; x += 16) {
192  draw_basis(dst + x + y*dst_linesize, dst_linesize, 4*amp, 1, 128*8);
193  amp++;
194  }
195  }
196 }
197 
198 static void cbp_test(uint8_t *dst[3], int dst_linesize[3], int off)
199 {
200  int x, y, cbp = 0;
201 
202  for (y = 0; y < 16*8; y += 16) {
203  for (x = 0; x < 16*8; x += 16) {
204  uint8_t *dst1[3];
205  dst1[0] = dst[0] + x*2 + y*2*dst_linesize[0];
206  dst1[1] = dst[1] + x + y* dst_linesize[1];
207  dst1[2] = dst[2] + x + y* dst_linesize[2];
208 
209  draw_cbp(dst1, dst_linesize, cbp, (64+off)*4, 128*8);
210  cbp++;
211  }
212  }
213 }
214 
215 static void mv_test(uint8_t *dst, int dst_linesize, int off)
216 {
217  int x, y;
218 
219  for (y = 0; y < 16*16; y++) {
220  if (y&16)
221  continue;
222  for (x = 0; x < 16*16; x++)
223  dst[x + y*dst_linesize] = x + off*8/(y/32+1);
224  }
225 }
226 
227 static void ring1_test(uint8_t *dst, int dst_linesize, int off)
228 {
229  int x, y, color = 0;
230 
231  for (y = off; y < 16*16; y += 16) {
232  for (x = off; x < 16*16; x += 16) {
233  draw_dc(dst + x + y*dst_linesize, dst_linesize, ((x+y)&16) ? color : -color, 16, 16);
234  color++;
235  }
236  }
237 }
238 
239 static void ring2_test(uint8_t *dst, int dst_linesize, int off)
240 {
241  int x, y;
242 
243  for (y = 0; y < 16*16; y++) {
244  for (x = 0; x < 16*16; x++) {
245  double d = hypot(x-8*16, y-8*16);
246  double r = d/20 - (int)(d/20);
247  if (r < off/30.0) {
248  dst[x + y*dst_linesize] = 255;
249  dst[x + y*dst_linesize+256] = 0;
250  } else {
251  dst[x + y*dst_linesize] = x;
252  dst[x + y*dst_linesize+256] = x;
253  }
254  }
255  }
256 }
257 
259 {
260  MPTestContext *test = ctx->priv;
261 
262  test->max_pts = test->duration >= 0 ?
263  av_rescale_q(test->duration, AV_TIME_BASE_Q, av_inv_q(test->frame_rate)) : -1;
264  test->pts = 0;
265 
266  av_log(ctx, AV_LOG_VERBOSE, "rate:%d/%d duration:%f\n",
267  test->frame_rate.num, test->frame_rate.den,
268  test->duration < 0 ? -1 : test->max_pts * av_q2d(av_inv_q(test->frame_rate)));
269  init_idct();
270 
271  return 0;
272 }
273 
274 static int config_props(AVFilterLink *outlink)
275 {
276  AVFilterContext *ctx = outlink->src;
277  MPTestContext *test = ctx->priv;
278  const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(outlink->format);
279 
280  test->hsub = pix_desc->log2_chroma_w;
281  test->vsub = pix_desc->log2_chroma_h;
282 
283  outlink->w = WIDTH;
284  outlink->h = HEIGHT;
285  outlink->time_base = av_inv_q(test->frame_rate);
286  outlink->frame_rate = test->frame_rate;
287 
288  return 0;
289 }
290 
291 static int request_frame(AVFilterLink *outlink)
292 {
293  MPTestContext *test = outlink->src->priv;
294  AVFrame *picref;
295  int w = WIDTH, h = HEIGHT,
296  cw = AV_CEIL_RSHIFT(w, test->hsub), ch = AV_CEIL_RSHIFT(h, test->vsub);
297  uint64_t frame = outlink->frame_count_in / test->max_frames;
298  uint64_t mod = outlink->frame_count_in % test->max_frames;
299  enum test_type tt = test->test;
300  int i;
301 
302  if (test->max_pts >= 0 && test->pts > test->max_pts)
303  return AVERROR_EOF;
304  picref = ff_get_video_buffer(outlink, w, h);
305  if (!picref)
306  return AVERROR(ENOMEM);
307  picref->pts = test->pts++;
308  picref->duration = 1;
309 
310  // clean image
311  for (i = 0; i < h; i++)
312  memset(picref->data[0] + i*picref->linesize[0], 0, w);
313  for (i = 0; i < ch; i++) {
314  memset(picref->data[1] + i*picref->linesize[1], 128, cw);
315  memset(picref->data[2] + i*picref->linesize[2], 128, cw);
316  }
317 
318  if (tt == TEST_ALL && mod) /* draw a black frame at the beginning of each test */
319  tt = frame%(TEST_NB-1);
320 
321  switch (tt) {
322  case TEST_DC_LUMA: dc_test(picref->data[0], picref->linesize[0], 256, 256, mod); break;
323  case TEST_DC_CHROMA: dc_test(picref->data[1], picref->linesize[1], 256, 256, mod); break;
324  case TEST_FREQ_LUMA: freq_test(picref->data[0], picref->linesize[0], mod); break;
325  case TEST_FREQ_CHROMA: freq_test(picref->data[1], picref->linesize[1], mod); break;
326  case TEST_AMP_LUMA: amp_test(picref->data[0], picref->linesize[0], mod); break;
327  case TEST_AMP_CHROMA: amp_test(picref->data[1], picref->linesize[1], mod); break;
328  case TEST_CBP: cbp_test(picref->data , picref->linesize , mod); break;
329  case TEST_MV: mv_test(picref->data[0], picref->linesize[0], mod); break;
330  case TEST_RING1: ring1_test(picref->data[0], picref->linesize[0], mod); break;
331  case TEST_RING2: ring2_test(picref->data[0], picref->linesize[0], mod); break;
332  }
333 
334  return ff_filter_frame(outlink, picref);
335 }
336 
337 static const AVFilterPad mptestsrc_outputs[] = {
338  {
339  .name = "default",
340  .type = AVMEDIA_TYPE_VIDEO,
341  .request_frame = request_frame,
342  .config_props = config_props,
343  },
344 };
345 
347  .name = "mptestsrc",
348  .description = NULL_IF_CONFIG_SMALL("Generate various test pattern."),
349  .priv_size = sizeof(MPTestContext),
350  .priv_class = &mptestsrc_class,
351  .init = init,
352  .inputs = NULL,
355 };
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:112
draw_basis
static void draw_basis(uint8_t *dst, int dst_linesize, int amp, int freq, int dc)
Definition: vsrc_mptestsrc.c:140
HEIGHT
#define HEIGHT
Definition: vsrc_mptestsrc.c:33
r
const char * r
Definition: vf_curves.c:127
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
idct
static void idct(uint8_t *dst, int dst_linesize, int src[64])
Definition: vsrc_mptestsrc.c:103
color
Definition: vf_paletteuse.c:512
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1015
AVFrame::duration
int64_t duration
Duration of the frame, in the same units as pts.
Definition: frame.h:780
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:258
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:264
TEST_ALL
@ TEST_ALL
Definition: vsrc_mptestsrc.c:46
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
step
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
Definition: rate_distortion.txt:58
w
uint8_t w
Definition: llviddspenc.c:38
ff_vsrc_mptestsrc
const AVFilter ff_vsrc_mptestsrc
Definition: vsrc_mptestsrc.c:346
AVOption
AVOption.
Definition: opt.h:357
test
Definition: idctdsp.c:35
AV_OPT_TYPE_DURATION
@ AV_OPT_TYPE_DURATION
Definition: opt.h:259
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
video.h
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(mptestsrc)
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
TEST_NB
@ TEST_NB
Definition: vsrc_mptestsrc.c:47
AVFilterContext::priv
void * priv
private data for use by the filter
Definition: avfilter.h:422
ring2_test
static void ring2_test(uint8_t *dst, int dst_linesize, int off)
Definition: vsrc_mptestsrc.c:239
init
static av_cold int init(AVFilterContext *ctx)
Definition: vsrc_mptestsrc.c:258
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
lrint
#define lrint
Definition: tablegen.h:53
av_cold
#define av_cold
Definition: attributes.h:90
MPTestContext::max_frames
int64_t max_frames
Definition: vsrc_mptestsrc.c:54
duration
int64_t duration
Definition: movenc.c:65
mptestsrc_options
static const AVOption mptestsrc_options[]
Definition: vsrc_mptestsrc.c:61
TEST_AMP_CHROMA
@ TEST_AMP_CHROMA
Definition: vsrc_mptestsrc.c:41
s
#define s(width, name)
Definition: cbs_vp9.c:198
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:59
TEST_DC_CHROMA
@ TEST_DC_CHROMA
Definition: vsrc_mptestsrc.c:37
MPTestContext::pts
int64_t pts
Definition: vsrc_mptestsrc.c:53
MPTestContext::duration
int64_t duration
Definition: vsrc_mptestsrc.c:53
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
AV_OPT_TYPE_INT64
@ AV_OPT_TYPE_INT64
Definition: opt.h:246
ctx
AVFormatContext * ctx
Definition: movenc.c:49
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
AVPixFmtDescriptor::log2_chroma_w
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
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
TEST_FREQ_CHROMA
@ TEST_FREQ_CHROMA
Definition: vsrc_mptestsrc.c:39
ring1_test
static void ring1_test(uint8_t *dst, int dst_linesize, int off)
Definition: vsrc_mptestsrc.c:227
OFFSET
#define OFFSET(x)
Definition: vsrc_mptestsrc.c:59
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
TEST_RING2
@ TEST_RING2
Definition: vsrc_mptestsrc.c:45
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
TEST_FREQ_LUMA
@ TEST_FREQ_LUMA
Definition: vsrc_mptestsrc.c:38
MPTestContext::test
int test
test_type
Definition: vsrc_mptestsrc.c:56
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
amp_test
static void amp_test(uint8_t *dst, int dst_linesize, int off)
Definition: vsrc_mptestsrc.c:186
MPTestContext
Definition: vsrc_mptestsrc.c:50
FLAGS
#define FLAGS
Definition: vsrc_mptestsrc.c:60
dc
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 top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:94
TEST_CBP
@ TEST_CBP
Definition: vsrc_mptestsrc.c:42
hypot
static av_const double hypot(double x, double y)
Definition: libm.h:366
M_PI
#define M_PI
Definition: mathematics.h:67
dc_test
static void dc_test(uint8_t *dst, int dst_linesize, int w, int h, int off)
Definition: vsrc_mptestsrc.c:161
internal.h
FILTER_SINGLE_PIXFMT
#define FILTER_SINGLE_PIXFMT(pix_fmt_)
Definition: internal.h:172
MPTestContext::max_pts
int64_t max_pts
Definition: vsrc_mptestsrc.c:53
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
request_frame
static int request_frame(AVFilterLink *outlink)
Definition: vsrc_mptestsrc.c:291
mptestsrc_outputs
static const AVFilterPad mptestsrc_outputs[]
Definition: vsrc_mptestsrc.c:337
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
mod
static int mod(int a, int b)
Modulo operation with only positive remainders.
Definition: vf_v360.c:752
MPTestContext::hsub
int hsub
Definition: vsrc_mptestsrc.c:55
TEST_DC_LUMA
@ TEST_DC_LUMA
Definition: vsrc_mptestsrc.c:36
freq_test
static void freq_test(uint8_t *dst, int dst_linesize, int off)
Definition: vsrc_mptestsrc.c:174
AVFilter
Filter definition.
Definition: avfilter.h:166
TEST_RING1
@ TEST_RING1
Definition: vsrc_mptestsrc.c:44
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
test_type
test_type
Definition: vsrc_mptestsrc.c:35
TEST_AMP_LUMA
@ TEST_AMP_LUMA
Definition: vsrc_mptestsrc.c:40
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
avfilter.h
cbp_test
static void cbp_test(uint8_t *dst[3], int dst_linesize[3], int off)
Definition: vsrc_mptestsrc.c:198
draw_cbp
static void draw_cbp(uint8_t *dst[3], int dst_linesize[3], int cbp, int amp, int dc)
Definition: vsrc_mptestsrc.c:151
c
static double c[64]
Definition: vsrc_mptestsrc.c:89
MPTestContext::frame_rate
AVRational frame_rate
Definition: vsrc_mptestsrc.c:52
av_clip_uint8
#define av_clip_uint8
Definition: common.h:105
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
init_idct
static void init_idct(void)
Definition: vsrc_mptestsrc.c:91
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FILTER_OUTPUTS
#define FILTER_OUTPUTS(array)
Definition: internal.h:183
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
d
d
Definition: ffmpeg_filter.c:424
TEST_MV
@ TEST_MV
Definition: vsrc_mptestsrc.c:43
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
WIDTH
#define WIDTH
Definition: vsrc_mptestsrc.c:32
draw_dc
static void draw_dc(uint8_t *dst, int dst_linesize, int color, int w, int h)
Definition: vsrc_mptestsrc.c:131
h
h
Definition: vp9dsp_template.c:2038
mv_test
static void mv_test(uint8_t *dst, int dst_linesize, int off)
Definition: vsrc_mptestsrc.c:215
config_props
static int config_props(AVFilterLink *outlink)
Definition: vsrc_mptestsrc.c:274
int
int
Definition: ffmpeg_filter.c:424
MPTestContext::vsub
int vsub
Definition: vsrc_mptestsrc.c:55
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:254
AVPixFmtDescriptor::log2_chroma_h
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89