Opened 10 years ago
Closed 5 years ago
#4681 closed defect (fixed)
Reference sample p0_03.j2k (ROI) shows artefacts
| Reported by: | Carl Eugen Hoyos | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avcodec |
| Version: | git-master | Keywords: | j2k |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
$ ffmpeg -i p0_03.j2k out.bmp
ffmpeg version N-73193-gf4be604 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 45.101 / 56. 45.101
libavformat 56. 38.102 / 56. 38.102
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 18.100 / 5. 18.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
[jpeg2000 @ 0x31400a0] unsupported marker 0xFF63 at pos 0x57
[jpeg2000 @ 0x31400a0] unsupported marker 0xFF5E at pos 0x136
Input #0, j2k_pipe, from 'p0_03.j2k':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: jpeg2000 (JPEG 2000 codestream restriction 1), gray(4 bpc), 256x256, 25 tbr, 25 tbn, 25 tbc
Output #0, image2, to 'out.bmp':
Metadata:
encoder : Lavf56.38.102
Stream #0:0: Video: bmp, gray(4 bpc), 256x256, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc56.45.101 bmp
Stream mapping:
Stream #0:0 -> #0:0 (jpeg2000 (native) -> bmp (native))
Press [q] to stop, [?] for help
[jpeg2000 @ 0x3147100] unsupported marker 0xFF63 at pos 0x57
[jpeg2000 @ 0x3147100] unsupported marker 0xFF5E at pos 0x136
frame= 1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:65kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Attachments (1)
Change History (3)
by , 10 years ago
comment:1 by , 10 years ago
| Summary: | Reference sample p0_03.j2k shows artefacts → Reference sample p0_03.j2k (ROI) shows artefacts |
|---|
comment:2 by , 5 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
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Fixed by Gautam Ramakrishnan in e58766ba12bc86f54af1d8078cbe02f45b1686aa
The following change makes decoding bit-exact with kdu_render and opj_decompress:
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c index 460a4ad95c..8d7c729530 100644 --- a/libavcodec/jpeg2000dec.c +++ b/libavcodec/jpeg2000dec.c @@ -1938,7 +1938,9 @@ static inline void tile_codeblocks(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile int val = lrintf(*datap) + (1 << (cbps - 1)); \ /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */ \ val = av_clip(val, 0, (1 << cbps) - 1); \ - *dst = val << (precision - cbps); \ + *dst = val << ((precision < 8 ? 8 : precision) - cbps); \ + if (precision < 8) \ + *dst |= *dst >> (8 - precision); \ datap++; \ dst += pixelsize; \ } \ @@ -1947,7 +1949,9 @@ static inline void tile_codeblocks(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile int val = *i_datap + (1 << (cbps - 1)); \ /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */ \ val = av_clip(val, 0, (1 << cbps) - 1); \ - *dst = val << (precision - cbps); \ + *dst = val << ((precision < 8 ? 8 : precision) - cbps); \ + if (precision < 8) \ + *dst |= *dst >> (8 - precision); \ i_datap++; \ dst += pixelsize; \ } \ @@ -1989,7 +1993,7 @@ static int jpeg2000_decode_tile(AVCodecContext *avctx, void *td, } if (s->precision <= 8) { - write_frame_8(s, tile, picture, 8); + write_frame_8(s, tile, picture, s->precision); } else { int precision = picture->format == AV_PIX_FMT_XYZ12 || picture->format == AV_PIX_FMT_RGB48 ||