avformat/image2: add Jpeg XL as image2 format

This commit adds support to libavformat for muxing
and demuxing Jpeg XL images as image2 streams.

MAINTAINERS

@@ -439,6 +439,7 @@ Muxers/Demuxers:
   ipmovie.c                             Mike Melanson
   ircam*                                Paul B Mahol
   iss.c                                 Stefan Gehrer
+  jpegxl_probe.*                        Leo Izen
   jvdec.c                               Peter Ross
   kvag.c                                Zane van Iperen
   libmodplug.c                          Clément Bœsch

libavformat/Makefile

@@ -272,6 +272,7 @@ OBJS-$(CONFIG_IMAGE_GIF_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_J2K_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_JPEG_PIPE_DEMUXER)    += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_JPEGLS_PIPE_DEMUXER)  += img2dec.o img2.o
+OBJS-$(CONFIG_IMAGE_JPEGXL_PIPE_DEMUXER)  += img2dec.o img2.o jpegxl_probe.o
 OBJS-$(CONFIG_IMAGE_PAM_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_PBM_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_PCX_PIPE_DEMUXER)     += img2dec.o img2.o

libavformat/allformats.c

@@ -510,6 +510,7 @@ extern const AVInputFormat  ff_image_gif_pipe_demuxer;
 extern const AVInputFormat  ff_image_j2k_pipe_demuxer;
 extern const AVInputFormat  ff_image_jpeg_pipe_demuxer;
 extern const AVInputFormat  ff_image_jpegls_pipe_demuxer;
+extern const AVInputFormat  ff_image_jpegxl_pipe_demuxer;
 extern const AVInputFormat  ff_image_pam_pipe_demuxer;
 extern const AVInputFormat  ff_image_pbm_pipe_demuxer;
 extern const AVInputFormat  ff_image_pcx_pipe_demuxer;

libavformat/img2.c

@@ -88,6 +88,7 @@ const IdStrMap ff_img_tags[] = {
     { AV_CODEC_ID_GEM,        "ximg"     },
     { AV_CODEC_ID_GEM,        "timg"     },
     { AV_CODEC_ID_VBN,        "vbn"      },
+    { AV_CODEC_ID_JPEGXL,     "jxl"      },
     { AV_CODEC_ID_NONE,       NULL       }
 };
 

libavformat/img2dec.c

@@ -36,6 +36,7 @@
 #include "avio_internal.h"
 #include "internal.h"
 #include "img2.h"
+#include "jpegxl_probe.h"
 #include "libavcodec/mjpeg.h"
 #include "libavcodec/vbn.h"
 #include "libavcodec/xwd.h"
@@ -837,6 +838,24 @@ static int jpegls_probe(const AVProbeData *p)
     return 0;
 }
 
+static int jpegxl_probe(const AVProbeData *p)
+{
+    const uint8_t *b = p->buf;
+
+    /* ISOBMFF-based container */
+    /* 0x4a584c20 == "JXL " */
+    if (AV_RL64(b) == FF_JPEGXL_CONTAINER_SIGNATURE_LE)
+        return AVPROBE_SCORE_EXTENSION + 1;
+    /* Raw codestreams all start with 0xff0a */
+    if (AV_RL16(b) != FF_JPEGXL_CODESTREAM_SIGNATURE_LE)
+        return 0;
+#if CONFIG_IMAGE_JPEGXL_PIPE_DEMUXER
+    if (ff_jpegxl_verify_codestream_header(p->buf, p->buf_size) >= 0)
+        return AVPROBE_SCORE_MAX - 2;
+#endif
+    return 0;
+}
+
 static int pcx_probe(const AVProbeData *p)
 {
     const uint8_t *b = p->buf;
@@ -1176,6 +1195,7 @@ IMAGEAUTO_DEMUXER(gif,       GIF)
 IMAGEAUTO_DEMUXER_EXT(j2k,   JPEG2000, J2K)
 IMAGEAUTO_DEMUXER_EXT(jpeg,  MJPEG, JPEG)
 IMAGEAUTO_DEMUXER(jpegls,    JPEGLS)
+IMAGEAUTO_DEMUXER(jpegxl,    JPEGXL)
 IMAGEAUTO_DEMUXER(pam,       PAM)
 IMAGEAUTO_DEMUXER(pbm,       PBM)
 IMAGEAUTO_DEMUXER(pcx,       PCX)

libavformat/img2enc.c

@@ -263,9 +263,9 @@ static const AVClass img2mux_class = {
 const AVOutputFormat ff_image2_muxer = {
     .name           = "image2",
     .long_name      = NULL_IF_CONFIG_SMALL("image2 sequence"),
-    .extensions     = "bmp,dpx,exr,jls,jpeg,jpg,ljpg,pam,pbm,pcx,pfm,pgm,pgmyuv,png,"
-                      "ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,im24,"
-                      "sunras,vbn,xbm,xface,pix,y",
+    .extensions     = "bmp,dpx,exr,jls,jpeg,jpg,jxl,ljpg,pam,pbm,pcx,pfm,pgm,pgmyuv,"
+                      "png,ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,"
+                      "im24,sunras,vbn,xbm,xface,pix,y",
     .priv_data_size = sizeof(VideoMuxData),
     .video_codec    = AV_CODEC_ID_MJPEG,
     .write_header   = write_header,

libavformat/jpegxl_probe.h

+/*
+ * Jpeg XL header verification
+ * Copyright (c) 2022 Leo Izen <leo.izen@gmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_JPEGXL_PROBE_H
+#define AVFORMAT_JPEGXL_PROBE_H
+
+#include <stdint.h>
+
+#define FF_JPEGXL_CODESTREAM_SIGNATURE_LE 0x0aff
+#define FF_JPEGXL_CONTAINER_SIGNATURE_LE 0x204c584a0c000000
+
+int ff_jpegxl_verify_codestream_header(const uint8_t *buf, int buflen);
+
+#endif /* AVFORMAT_JPEGXL_PROBE_H */

libavformat/mov.c

@@ -7839,6 +7839,7 @@ static int mov_probe(const AVProbeData *p)
             if (tag == MKTAG('f','t','y','p') &&
                        (   AV_RL32(p->buf + offset + 8) == MKTAG('j','p','2',' ')
                         || AV_RL32(p->buf + offset + 8) == MKTAG('j','p','x',' ')
+                        || AV_RL32(p->buf + offset + 8) == MKTAG('j','x','l',' ')
                     )) {
                 score = FFMAX(score, 5);
             } else {