Hi Caleb,
There is a space missing in the commit message before "fast-fail".
Few minor comments below.
Looks good otherwise -- it works as expected on an MXF file that
contains JPEG 2000 Part 15 code-blocks.
Looking forward to the full implementation!
Best,
-- Pierre
On Tue, Apr 19, 2022 at 1:17 AM caleb <etemesica...@gmail.com> wrote:
>
> ---
> This patch adds support for detecting Part 15 codeblocks to JPEG2000
> specified in (Rec. ITU-T T.814 | ISO/IEC 15444-15).
>
> The decoder on detecting Part 15 codeblocks now fails gracefully with a
> AVERROR_PATCHWELCOME return code
>
> libavcodec/jpeg2000.h | 2 ++
> libavcodec/jpeg2000dec.c | 9 +++++++++
> 2 files changed, 11 insertions(+)
>
> diff --git a/libavcodec/jpeg2000.h b/libavcodec/jpeg2000.h
> index d06313425e..e5ecb4cbf9 100644
> --- a/libavcodec/jpeg2000.h
> +++ b/libavcodec/jpeg2000.h
> @@ -110,6 +110,8 @@ enum Jpeg2000Quantsty { // quantization style
> #define JPEG2000_CSTY_PREC 0x01 // Precincts defined in coding style
> #define JPEG2000_CSTY_SOP 0x02 // SOP marker present
> #define JPEG2000_CSTY_EPH 0x04 // EPH marker present
> +#define JPEG2000_CTSY_HTJ2K_F 0x40 // Only HT code-blocks (Rec. ITU-T
> T.814 | ISO/IEC 15444-15) are present
> +#define JPEG2000_CTSY_HTJ2K_M 0xC0 // HT code blocks (Rec. ITU-T T.814 |
> ISO/IEC 15444-15) can be present
>
> // Progression orders
> #define JPEG2000_PGOD_LRCP 0x00 // Layer-resolution
> level-component-position progression
> diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
> index 92966b11f5..ef4a653afe 100644
> --- a/libavcodec/jpeg2000dec.c
> +++ b/libavcodec/jpeg2000dec.c
> @@ -521,6 +521,15 @@ static int get_cox(Jpeg2000DecoderContext *s,
> Jpeg2000CodingStyle *c)
>
> c->cblk_style = bytestream2_get_byteu(&s->g);
> if (c->cblk_style != 0) { // cblk style
> + if (c->cblk_style & JPEG2000_CTSY_HTJ2K_M || c->cblk_style &
> JPEG2000_CTSY_HTJ2K_F) {
> + /*
> + * HT code-blocks (Rec. ITU-T T.814 | ISO/IEC 15444-15)
> bit-stream
> + * Not yet supported in ffmpeg, cannot continue.
The comment above can be removed since the av_log and return code are
sufficiently descriptive.
> + */
> + av_log(s->avctx, AV_LOG_FATAL, "Support for High throughput JPEG
> 2000 is not yet available\n");
That should probably be AV_LOG_ERROR.
> + return AVERROR_PATCHWELCOME;
> + }
> +
> av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n",
> c->cblk_style);
> if (c->cblk_style & JPEG2000_CBLK_BYPASS)
> av_log(s->avctx, AV_LOG_WARNING, "Selective arithmetic coding
> bypass\n");
> --
> 2.34.0
>
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