avcodec/jpegxl: add Jpeg XL image codec

This commit adds support to libavcodec to read
encoded Jpeg XL images. Jpeg XL is intended to be an
extended-life replacement to legacy mjpeg.

MAINTAINERS

@@ -618,6 +618,7 @@ Haihao Xiang (haihao)         1F0C 31E8 B4FE F7A4 4DC1 DC99 E0F5 76D4 76FC 437F
 Jaikrishnan Menon             61A1 F09F 01C9 2D45 78E1 C862 25DC 8831 AF70 D368
 James Almer                   7751 2E8C FD94 A169 57E6 9A7A 1463 01AD 7376 59E0
 Jean Delvare                  7CA6 9F44 60F1 BDC4 1FD2 C858 A552 6B9B B3CD 4E6A
+Leo Izen (thebombzen)         B6FD 3CFC 7ACF 83FC 9137 6945 5A71 C331 FD2F A19A
 Loren Merritt                 ABD9 08F4 C920 3F65 D8BE 35D7 1540 DAA7 060F 56DE
 Lynne                         FE50 139C 6805 72CA FD52 1F8D A2FE A5F0 3F03 4464
 Michael Niedermayer           9FF2 128B 147E F673 0BAD F133 611E C787 040B 0FAB

libavcodec/codec_desc.c

@@ -1870,6 +1870,15 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("Vizrt Binary Image"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_JPEGXL,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "jpegxl",
+        .long_name = NULL_IF_CONFIG_SMALL("JPEG XL"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY |
+                     AV_CODEC_PROP_LOSSLESS,
+        .mime_types= MT("image/jxl"),
+    },
 
     /* various PCM "codecs" */
     {

libavcodec/codec_id.h

@@ -309,6 +309,7 @@ enum AVCodecID {
     AV_CODEC_ID_SGA_VIDEO,
     AV_CODEC_ID_GEM,
     AV_CODEC_ID_VBN,
+    AV_CODEC_ID_JPEGXL,
 
     /* various PCM "codecs" */
     AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs