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1 | //! Image conversion functionality. | |
2 | ||
3 | //! # Examples | |
4 | //! | |
5 | //! Convert input image into YUV one and scale down two times. | |
6 | //! ```no_run | |
7 | //! use nihav_core::scale::*; | |
8 | //! use nihav_core::formats::{RGB24_FORMAT, YUV420_FORMAT}; | |
9 | //! use nihav_core::frame::{alloc_video_buffer, NAVideoInfo}; | |
10 | //! | |
11 | //! let mut in_pic = alloc_video_buffer(NAVideoInfo::new(640, 480, false, RGB24_FORMAT), 4).unwrap(); | |
12 | //! let mut out_pic = alloc_video_buffer(NAVideoInfo::new(320, 240, false, YUV420_FORMAT), 4).unwrap(); | |
13 | //! let in_fmt = get_scale_fmt_from_pic(&in_pic); | |
14 | //! let out_fmt = get_scale_fmt_from_pic(&out_pic); | |
15 | //! let mut scaler = NAScale::new(in_fmt, out_fmt).unwrap(); | |
16 | //! scaler.convert(&in_pic, &mut out_pic).unwrap(); | |
17 | //! ``` | |
18 | use crate::frame::*; | |
19 | ||
20 | mod kernel; | |
21 | ||
22 | mod colorcvt; | |
23 | mod repack; | |
24 | mod scale; | |
25 | ||
26 | /// Image format information used by the converter. | |
27 | #[derive(Clone,Copy,PartialEq)] | |
28 | pub struct ScaleInfo { | |
29 | /// Pixel format description. | |
30 | pub fmt: NAPixelFormaton, | |
31 | /// Image width. | |
32 | pub width: usize, | |
33 | /// Image height. | |
34 | pub height: usize, | |
35 | } | |
36 | ||
37 | impl std::fmt::Display for ScaleInfo { | |
38 | fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { | |
39 | write!(f, "({}x{}, {})", self.width, self.height, self.fmt) | |
40 | } | |
41 | } | |
42 | ||
43 | /// A list specifying general image conversion errors. | |
44 | #[derive(Debug,Clone,Copy,PartialEq)] | |
45 | #[allow(dead_code)] | |
46 | pub enum ScaleError { | |
47 | /// Input or output buffer contains no image data. | |
48 | NoFrame, | |
49 | /// Allocation failed. | |
50 | AllocError, | |
51 | /// Invalid argument. | |
52 | InvalidArgument, | |
53 | /// Feature is not implemented. | |
54 | NotImplemented, | |
55 | /// Internal implementation bug. | |
56 | Bug, | |
57 | } | |
58 | ||
59 | /// A specialised `Result` type for image conversion operations. | |
60 | pub type ScaleResult<T> = Result<T, ScaleError>; | |
61 | ||
62 | /*trait Kernel { | |
63 | fn init(&mut self, in_fmt: &ScaleInfo, dest_fmt: &ScaleInfo) -> ScaleResult<NABufferType>; | |
64 | fn process(&mut self, pic_in: &NABufferType, pic_out: &mut NABufferType); | |
65 | }*/ | |
66 | ||
67 | struct KernelDesc { | |
68 | name: &'static str, | |
69 | create: fn () -> Box<dyn kernel::Kernel>, | |
70 | } | |
71 | ||
72 | impl KernelDesc { | |
73 | fn find(name: &str) -> ScaleResult<Box<dyn kernel::Kernel>> { | |
74 | for kern in KERNELS.iter() { | |
75 | if kern.name == name { | |
76 | return Ok((kern.create)()); | |
77 | } | |
78 | } | |
79 | Err(ScaleError::InvalidArgument) | |
80 | } | |
81 | } | |
82 | ||
83 | const KERNELS: &[KernelDesc] = &[ | |
84 | KernelDesc { name: "pack", create: repack::create_pack }, | |
85 | KernelDesc { name: "unpack", create: repack::create_unpack }, | |
86 | KernelDesc { name: "depal", create: repack::create_depal }, | |
87 | KernelDesc { name: "scale", create: scale::create_scale }, | |
88 | KernelDesc { name: "rgb_to_yuv", create: colorcvt::create_rgb2yuv }, | |
89 | KernelDesc { name: "yuv_to_rgb", create: colorcvt::create_yuv2rgb }, | |
90 | ]; | |
91 | ||
92 | struct Stage { | |
93 | fmt_out: ScaleInfo, | |
94 | tmp_pic: NABufferType, | |
95 | next: Option<Box<Stage>>, | |
96 | worker: Box<dyn kernel::Kernel>, | |
97 | } | |
98 | ||
99 | /// Converts input picture information into format used by scaler. | |
100 | pub fn get_scale_fmt_from_pic(pic: &NABufferType) -> ScaleInfo { | |
101 | let info = pic.get_video_info().unwrap(); | |
102 | ScaleInfo { fmt: info.get_format(), width: info.get_width(), height: info.get_height() } | |
103 | } | |
104 | ||
105 | impl Stage { | |
106 | fn new(name: &str, in_fmt: &ScaleInfo, dest_fmt: &ScaleInfo) -> ScaleResult<Self> { | |
107 | let mut worker = KernelDesc::find(name)?; | |
108 | let tmp_pic = worker.init(in_fmt, dest_fmt)?; | |
109 | let fmt_out = get_scale_fmt_from_pic(&tmp_pic); | |
110 | Ok(Self { fmt_out, tmp_pic, next: None, worker }) | |
111 | } | |
112 | fn add(&mut self, new: Stage) { | |
113 | if let Some(ref mut next) = self.next { | |
114 | next.add(new); | |
115 | } else { | |
116 | self.next = Some(Box::new(new)); | |
117 | } | |
118 | } | |
119 | fn process(&mut self, pic_in: &NABufferType, pic_out: &mut NABufferType) -> ScaleResult<()> { | |
120 | if let Some(ref mut nextstage) = self.next { | |
121 | self.worker.process(pic_in, &mut self.tmp_pic); | |
122 | nextstage.process(&self.tmp_pic, pic_out)?; | |
123 | } else { | |
124 | self.worker.process(pic_in, pic_out); | |
125 | } | |
126 | Ok(()) | |
127 | } | |
128 | fn drop_last_tmp(&mut self) { | |
129 | if let Some(ref mut nextstage) = self.next { | |
130 | nextstage.drop_last_tmp(); | |
131 | } else { | |
132 | self.tmp_pic = NABufferType::None; | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | /// Image format converter. | |
138 | pub struct NAScale { | |
139 | fmt_in: ScaleInfo, | |
140 | fmt_out: ScaleInfo, | |
141 | just_convert: bool, | |
142 | pipeline: Option<Stage>, | |
143 | } | |
144 | ||
145 | fn check_format(in_fmt: NAVideoInfo, ref_fmt: &ScaleInfo, just_convert: bool) -> ScaleResult<()> { | |
146 | if in_fmt.get_format() != ref_fmt.fmt { return Err(ScaleError::InvalidArgument); } | |
147 | if !just_convert && (in_fmt.get_width() != ref_fmt.width || in_fmt.get_height() != ref_fmt.height) { | |
148 | return Err(ScaleError::InvalidArgument); | |
149 | } | |
150 | Ok(()) | |
151 | } | |
152 | ||
153 | fn copy(pic_in: &NABufferType, pic_out: &mut NABufferType) | |
154 | { | |
155 | if let (Some(ref sbuf), Some(ref mut dbuf)) = (pic_in.get_vbuf(), pic_out.get_vbuf()) { | |
156 | let mut same = true; | |
157 | let num_components = sbuf.get_info().get_format().get_num_comp(); | |
158 | for i in 0..num_components { | |
159 | if sbuf.get_stride(i) != dbuf.get_stride(i) { | |
160 | same = false; | |
161 | break; | |
162 | } | |
163 | if sbuf.get_offset(i) != dbuf.get_offset(i) { | |
164 | same = false; | |
165 | break; | |
166 | } | |
167 | } | |
168 | if same { | |
169 | let sdata = sbuf.get_data(); | |
170 | let ddata = dbuf.get_data_mut().unwrap(); | |
171 | ddata.copy_from_slice(&sdata[0..]); | |
172 | } else { | |
173 | let sdata = sbuf.get_data(); | |
174 | for comp in 0..num_components { | |
175 | let (_, h) = sbuf.get_dimensions(comp); | |
176 | let src = &sdata[sbuf.get_offset(comp)..]; | |
177 | let sstride = sbuf.get_stride(comp); | |
178 | let doff = dbuf.get_offset(comp); | |
179 | let dstride = dbuf.get_stride(comp); | |
180 | let ddata = dbuf.get_data_mut().unwrap(); | |
181 | let dst = &mut ddata[doff..]; | |
182 | let copy_size = sstride.min(dstride); | |
183 | for (dline, sline) in dst.chunks_exact_mut(dstride).take(h).zip(src.chunks_exact(sstride)) { | |
184 | (&mut dline[..copy_size]).copy_from_slice(&sline[..copy_size]); | |
185 | } | |
186 | } | |
187 | } | |
188 | } else { | |
189 | unimplemented!(); | |
190 | } | |
191 | } | |
192 | ||
193 | macro_rules! add_stage { | |
194 | ($head:expr, $new:expr) => { | |
195 | if let Some(ref mut h) = $head { | |
196 | h.add($new); | |
197 | } else { | |
198 | $head = Some($new); | |
199 | } | |
200 | }; | |
201 | } | |
202 | fn is_better_fmt(a: &ScaleInfo, b: &ScaleInfo) -> bool { | |
203 | if (a.width >= b.width) && (a.height >= b.height) { | |
204 | return true; | |
205 | } | |
206 | if a.fmt.get_max_depth() > b.fmt.get_max_depth() { | |
207 | return true; | |
208 | } | |
209 | if a.fmt.get_max_subsampling() < b.fmt.get_max_subsampling() { | |
210 | return true; | |
211 | } | |
212 | false | |
213 | } | |
214 | fn build_pipeline(ifmt: &ScaleInfo, ofmt: &ScaleInfo, just_convert: bool) -> ScaleResult<Option<Stage>> { | |
215 | let inname = ifmt.fmt.get_model().get_short_name(); | |
216 | let outname = ofmt.fmt.get_model().get_short_name(); | |
217 | ||
218 | println!("convert {} -> {}", ifmt, ofmt); | |
219 | let needs_scale = if (ofmt.fmt.get_max_subsampling() > 0) && | |
220 | (ofmt.fmt.get_max_subsampling() != ifmt.fmt.get_max_subsampling()) { | |
221 | true | |
222 | } else { | |
223 | !just_convert | |
224 | }; | |
225 | let needs_unpack = !ifmt.fmt.is_unpacked(); | |
226 | let needs_pack = !ofmt.fmt.is_unpacked(); | |
227 | let needs_convert = inname != outname; | |
228 | let scale_before_cvt = is_better_fmt(&ifmt, &ofmt) && needs_convert | |
229 | && (ofmt.fmt.get_max_subsampling() == 0); | |
230 | //todo stages for model and gamma conversion | |
231 | ||
232 | let mut stages: Option<Stage> = None; | |
233 | let mut cur_fmt = *ifmt; | |
234 | ||
235 | if needs_unpack { | |
236 | println!("[adding unpack]"); | |
237 | let new_stage = if !cur_fmt.fmt.is_paletted() { | |
238 | Stage::new("unpack", &cur_fmt, &ofmt)? | |
239 | } else { | |
240 | Stage::new("depal", &cur_fmt, &ofmt)? | |
241 | }; | |
242 | cur_fmt = new_stage.fmt_out; | |
243 | add_stage!(stages, new_stage); | |
244 | } | |
245 | if needs_scale && scale_before_cvt { | |
246 | println!("[adding scale]"); | |
247 | let new_stage = Stage::new("scale", &cur_fmt, &ofmt)?; | |
248 | cur_fmt = new_stage.fmt_out; | |
249 | add_stage!(stages, new_stage); | |
250 | } | |
251 | if needs_convert { | |
252 | println!("[adding convert]"); | |
253 | let cvtname = format!("{}_to_{}", inname, outname); | |
254 | println!("[{}]", cvtname); | |
255 | let new_stage = Stage::new(&cvtname, &cur_fmt, &ofmt)?; | |
256 | //todo if fails try converting via RGB or YUV | |
257 | cur_fmt = new_stage.fmt_out; | |
258 | add_stage!(stages, new_stage); | |
259 | //todo alpha plane copy/add | |
260 | } | |
261 | if needs_scale && !scale_before_cvt { | |
262 | println!("[adding scale]"); | |
263 | let new_stage = Stage::new("scale", &cur_fmt, &ofmt)?; | |
264 | cur_fmt = new_stage.fmt_out; | |
265 | add_stage!(stages, new_stage); | |
266 | } | |
267 | if needs_pack { | |
268 | println!("[adding pack]"); | |
269 | let new_stage = Stage::new("pack", &cur_fmt, &ofmt)?; | |
270 | //cur_fmt = new_stage.fmt_out; | |
271 | add_stage!(stages, new_stage); | |
272 | } | |
273 | ||
274 | if let Some(ref mut head) = stages { | |
275 | head.drop_last_tmp(); | |
276 | } | |
277 | ||
278 | Ok(stages) | |
279 | } | |
280 | ||
281 | fn swap_plane<T:Copy>(data: &mut [T], stride: usize, h: usize, line0: &mut [T], line1: &mut [T]) { | |
282 | let mut doff0 = 0; | |
283 | let mut doff1 = stride * (h - 1); | |
284 | for _ in 0..h/2 { | |
285 | line0.copy_from_slice(&data[doff0..][..stride]); | |
286 | line1.copy_from_slice(&data[doff1..][..stride]); | |
287 | (&mut data[doff1..][..stride]).copy_from_slice(line0); | |
288 | (&mut data[doff0..][..stride]).copy_from_slice(line1); | |
289 | doff0 += stride; | |
290 | doff1 -= stride; | |
291 | } | |
292 | } | |
293 | ||
294 | /// Flips the picture contents. | |
295 | pub fn flip_picture(pic: &mut NABufferType) -> ScaleResult<()> { | |
296 | match pic { | |
297 | NABufferType::Video(ref mut vb) => { | |
298 | let ncomp = vb.get_num_components(); | |
299 | for comp in 0..ncomp { | |
300 | let off = vb.get_offset(comp); | |
301 | let stride = vb.get_stride(comp); | |
302 | let (_, h) = vb.get_dimensions(comp); | |
303 | let data = vb.get_data_mut().unwrap(); | |
304 | let mut line0 = vec![0; stride]; | |
305 | let mut line1 = vec![0; stride]; | |
306 | swap_plane(&mut data[off..], stride, h, line0.as_mut_slice(), line1.as_mut_slice()); | |
307 | } | |
308 | }, | |
309 | NABufferType::Video16(ref mut vb) => { | |
310 | let ncomp = vb.get_num_components(); | |
311 | for comp in 0..ncomp { | |
312 | let off = vb.get_offset(comp); | |
313 | let stride = vb.get_stride(comp); | |
314 | let (_, h) = vb.get_dimensions(comp); | |
315 | let data = vb.get_data_mut().unwrap(); | |
316 | let mut line0 = vec![0; stride]; | |
317 | let mut line1 = vec![0; stride]; | |
318 | swap_plane(&mut data[off..], stride, h, line0.as_mut_slice(), line1.as_mut_slice()); | |
319 | } | |
320 | }, | |
321 | NABufferType::Video32(ref mut vb) => { | |
322 | let ncomp = vb.get_num_components(); | |
323 | for comp in 0..ncomp { | |
324 | let off = vb.get_offset(comp); | |
325 | let stride = vb.get_stride(comp); | |
326 | let (_, h) = vb.get_dimensions(comp); | |
327 | let data = vb.get_data_mut().unwrap(); | |
328 | let mut line0 = vec![0; stride]; | |
329 | let mut line1 = vec![0; stride]; | |
330 | swap_plane(&mut data[off..], stride, h, line0.as_mut_slice(), line1.as_mut_slice()); | |
331 | } | |
332 | }, | |
333 | NABufferType::VideoPacked(ref mut vb) => { | |
334 | let ncomp = vb.get_num_components(); | |
335 | for comp in 0..ncomp { | |
336 | let off = vb.get_offset(comp); | |
337 | let stride = vb.get_stride(comp); | |
338 | let (_, h) = vb.get_dimensions(comp); | |
339 | let data = vb.get_data_mut().unwrap(); | |
340 | let mut line0 = vec![0; stride]; | |
341 | let mut line1 = vec![0; stride]; | |
342 | swap_plane(&mut data[off..], stride, h, line0.as_mut_slice(), line1.as_mut_slice()); | |
343 | } | |
344 | }, | |
345 | _ => { return Err(ScaleError::InvalidArgument); }, | |
346 | }; | |
347 | Ok(()) | |
348 | } | |
349 | ||
350 | impl NAScale { | |
351 | /// Constructs a new `NAScale` instance. | |
352 | pub fn new(fmt_in: ScaleInfo, fmt_out: ScaleInfo) -> ScaleResult<Self> { | |
353 | let pipeline; | |
354 | let just_convert = (fmt_in.width == fmt_out.width) && (fmt_in.height == fmt_out.height); | |
355 | if fmt_in != fmt_out { | |
356 | pipeline = build_pipeline(&fmt_in, &fmt_out, just_convert)?; | |
357 | } else { | |
358 | pipeline = None; | |
359 | } | |
360 | Ok(Self { fmt_in, fmt_out, just_convert, pipeline }) | |
361 | } | |
362 | /// Checks whether requested conversion operation is needed at all. | |
363 | pub fn needs_processing(&self) -> bool { self.pipeline.is_some() } | |
364 | /// Returns the input image format. | |
365 | pub fn get_in_fmt(&self) -> ScaleInfo { self.fmt_in } | |
366 | /// Returns the output image format. | |
367 | pub fn get_out_fmt(&self) -> ScaleInfo { self.fmt_out } | |
368 | /// Performs the image format conversion. | |
369 | pub fn convert(&mut self, pic_in: &NABufferType, pic_out: &mut NABufferType) -> ScaleResult<()> { | |
370 | let in_info = pic_in.get_video_info(); | |
371 | let out_info = pic_out.get_video_info(); | |
372 | if in_info.is_none() || out_info.is_none() { return Err(ScaleError::InvalidArgument); } | |
373 | let in_info = in_info.unwrap(); | |
374 | let out_info = out_info.unwrap(); | |
375 | if self.just_convert && | |
376 | (in_info.get_width() != out_info.get_width() || in_info.get_height() != out_info.get_height()) { | |
377 | return Err(ScaleError::InvalidArgument); | |
378 | } | |
379 | let needs_flip = in_info.is_flipped() ^ out_info.is_flipped(); | |
380 | check_format(in_info, &self.fmt_in, self.just_convert)?; | |
381 | check_format(out_info, &self.fmt_out, self.just_convert)?; | |
382 | let ret = if let Some(ref mut pipe) = self.pipeline { | |
383 | pipe.process(pic_in, pic_out) | |
384 | } else { | |
385 | copy(pic_in, pic_out); | |
386 | Ok(()) | |
387 | }; | |
388 | if ret.is_ok() && needs_flip { | |
389 | flip_picture(pic_out)?; | |
390 | } | |
391 | ret | |
392 | } | |
393 | } | |
394 | ||
395 | #[cfg(test)] | |
396 | mod test { | |
397 | use super::*; | |
398 | ||
399 | fn fill_pic(pic: &mut NABufferType, val: u8) { | |
400 | if let Some(ref mut buf) = pic.get_vbuf() { | |
401 | let data = buf.get_data_mut().unwrap(); | |
402 | for el in data.iter_mut() { *el = val; } | |
403 | } else if let Some(ref mut buf) = pic.get_vbuf16() { | |
404 | let data = buf.get_data_mut().unwrap(); | |
405 | for el in data.iter_mut() { *el = val as u16; } | |
406 | } else if let Some(ref mut buf) = pic.get_vbuf32() { | |
407 | let data = buf.get_data_mut().unwrap(); | |
408 | for el in data.iter_mut() { *el = (val as u32) * 0x01010101; } | |
409 | } | |
410 | } | |
411 | #[test] | |
412 | fn test_convert() { | |
413 | let mut in_pic = alloc_video_buffer(NAVideoInfo::new(1, 1, false, RGB565_FORMAT), 3).unwrap(); | |
414 | fill_pic(&mut in_pic, 42); | |
415 | let mut out_pic = alloc_video_buffer(NAVideoInfo::new(1, 1, false, RGB24_FORMAT), 3).unwrap(); | |
416 | fill_pic(&mut out_pic, 0); | |
417 | let ifmt = get_scale_fmt_from_pic(&in_pic); | |
418 | let ofmt = get_scale_fmt_from_pic(&out_pic); | |
419 | let mut scaler = NAScale::new(ifmt, ofmt).unwrap(); | |
420 | scaler.convert(&in_pic, &mut out_pic).unwrap(); | |
421 | let obuf = out_pic.get_vbuf().unwrap(); | |
422 | let odata = obuf.get_data(); | |
423 | assert_eq!(odata[0], 0x0); | |
424 | assert_eq!(odata[1], 0x4); | |
425 | assert_eq!(odata[2], 0x52); | |
426 | ||
427 | let mut in_pic = alloc_video_buffer(NAVideoInfo::new(4, 4, false, RGB24_FORMAT), 3).unwrap(); | |
428 | fill_pic(&mut in_pic, 42); | |
429 | let mut out_pic = alloc_video_buffer(NAVideoInfo::new(4, 4, false, YUV420_FORMAT), 3).unwrap(); | |
430 | fill_pic(&mut out_pic, 0); | |
431 | let ifmt = get_scale_fmt_from_pic(&in_pic); | |
432 | let ofmt = get_scale_fmt_from_pic(&out_pic); | |
433 | let mut scaler = NAScale::new(ifmt, ofmt).unwrap(); | |
434 | scaler.convert(&in_pic, &mut out_pic).unwrap(); | |
435 | let obuf = out_pic.get_vbuf().unwrap(); | |
436 | let yoff = obuf.get_offset(0); | |
437 | let uoff = obuf.get_offset(1); | |
438 | let voff = obuf.get_offset(2); | |
439 | let odata = obuf.get_data(); | |
440 | assert_eq!(odata[yoff], 42); | |
441 | assert!(((odata[uoff] ^ 0x80) as i8).abs() <= 1); | |
442 | assert!(((odata[voff] ^ 0x80) as i8).abs() <= 1); | |
443 | let mut scaler = NAScale::new(ofmt, ifmt).unwrap(); | |
444 | scaler.convert(&out_pic, &mut in_pic).unwrap(); | |
445 | let obuf = in_pic.get_vbuf().unwrap(); | |
446 | let odata = obuf.get_data(); | |
447 | assert_eq!(odata[0], 42); | |
448 | } | |
449 | #[test] | |
450 | fn test_scale() { | |
451 | let mut in_pic = alloc_video_buffer(NAVideoInfo::new(2, 2, false, RGB565_FORMAT), 3).unwrap(); | |
452 | fill_pic(&mut in_pic, 42); | |
453 | let mut out_pic = alloc_video_buffer(NAVideoInfo::new(3, 3, false, RGB565_FORMAT), 3).unwrap(); | |
454 | fill_pic(&mut out_pic, 0); | |
455 | let ifmt = get_scale_fmt_from_pic(&in_pic); | |
456 | let ofmt = get_scale_fmt_from_pic(&out_pic); | |
457 | let mut scaler = NAScale::new(ifmt, ofmt).unwrap(); | |
458 | scaler.convert(&in_pic, &mut out_pic).unwrap(); | |
459 | let obuf = out_pic.get_vbuf16().unwrap(); | |
460 | let odata = obuf.get_data(); | |
461 | assert_eq!(odata[0], 42); | |
462 | } | |
463 | #[test] | |
464 | fn test_scale_and_convert() { | |
465 | let mut in_pic = alloc_video_buffer(NAVideoInfo::new(7, 3, false, RGB565_FORMAT), 3).unwrap(); | |
466 | fill_pic(&mut in_pic, 42); | |
467 | let mut out_pic = alloc_video_buffer(NAVideoInfo::new(4, 4, false, YUV420_FORMAT), 3).unwrap(); | |
468 | fill_pic(&mut out_pic, 0); | |
469 | let ifmt = get_scale_fmt_from_pic(&in_pic); | |
470 | let ofmt = get_scale_fmt_from_pic(&out_pic); | |
471 | let mut scaler = NAScale::new(ifmt, ofmt).unwrap(); | |
472 | scaler.convert(&in_pic, &mut out_pic).unwrap(); | |
473 | let obuf = out_pic.get_vbuf().unwrap(); | |
474 | let yoff = obuf.get_offset(0); | |
475 | let uoff = obuf.get_offset(1); | |
476 | let voff = obuf.get_offset(2); | |
477 | let odata = obuf.get_data(); | |
478 | assert_eq!(odata[yoff], 28); | |
479 | assert_eq!(odata[uoff], 154); | |
480 | assert_eq!(odata[voff], 103); | |
481 | } | |
482 | } |