[FFmpeg-devel] [PATCH v4] avcodec: add farbfeld encoder

[Marcus B Spencer <marcus@marcusspencer.xyz>]

farbfeld is an uncompressed image format that is a part of suckless
tools (https://tools.suckless.org).

Its documentation is available at https://tools.suckless.org/farbfeld.

Add support for this image format in avcodec and update the image2
format accordingly.

Signed-off-by: Marcus B Spencer <marcus@marcusspencer.xyz>
---
 Changelog                 |  1 +
 doc/general_contents.texi |  2 +
 libavcodec/Makefile       |  1 +
 libavcodec/allcodecs.c    |  1 +
 libavcodec/codec_desc.c   |  7 ++++
 libavcodec/codec_id.h     |  1 +
 libavcodec/farbfeldenc.c  | 84 +++++++++++++++++++++++++++++++++++++++
 libavcodec/version.h      |  2 +-
 libavformat/img2.c        |  1 +
 libavformat/img2enc.c     |  2 +-
 10 files changed, 100 insertions(+), 2 deletions(-)
 create mode 100644 libavcodec/farbfeldenc.c

diff --git a/Changelog b/Changelog
index 03d6b29ad8..d2b831c623 100644
--- a/Changelog
+++ b/Changelog
@@ -12,6 +12,7 @@ version <next>:
 - qsv_params option added for QSV encoders
 - VVC decoder compatible with DVB test content
 - xHE-AAC decoder
+- farbfeld encoder
 
 
 version 7.0:
diff --git a/doc/general_contents.texi b/doc/general_contents.texi
index e7cf4f8239..129a325ecf 100644
--- a/doc/general_contents.texi
+++ b/doc/general_contents.texi
@@ -853,6 +853,8 @@ following image formats are supported:
     @tab X PixMap image format
 @item XWD  @tab X @tab X
     @tab X Window Dump image format
+@item FF           @tab X @tab
+    @tab farbfeld uncompressed image format
 @end multitable
 
 @code{X} means that the feature in that column (encoding / decoding) is supported.
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 8ab4398b6c..9647279423 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -356,6 +356,7 @@ OBJS-$(CONFIG_ESCAPE130_DECODER)       += escape130.o
 OBJS-$(CONFIG_EVRC_DECODER)            += evrcdec.o acelp_vectors.o lsp.o
 OBJS-$(CONFIG_EXR_DECODER)             += exr.o exrdsp.o half2float.o
 OBJS-$(CONFIG_EXR_ENCODER)             += exrenc.o float2half.o
+OBJS-$(CONFIG_FARBFELD_ENCODER)        += farbfeldenc.o
 OBJS-$(CONFIG_FASTAUDIO_DECODER)       += fastaudio.o
 OBJS-$(CONFIG_FFV1_DECODER)            += ffv1dec.o ffv1.o
 OBJS-$(CONFIG_FFV1_ENCODER)            += ffv1enc.o ffv1.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index b102a8069e..b0ebb72396 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -115,6 +115,7 @@ extern const FFCodec ff_escape124_decoder;
 extern const FFCodec ff_escape130_decoder;
 extern const FFCodec ff_exr_encoder;
 extern const FFCodec ff_exr_decoder;
+extern const FFCodec ff_farbfeld_encoder;
 extern const FFCodec ff_ffv1_encoder;
 extern const FFCodec ff_ffv1_decoder;
 extern const FFCodec ff_ffvhuff_encoder;
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index a28ef68061..33dbd2ce94 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1959,6 +1959,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("LEAD MCMP"),
         .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_FARBFELD,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "farbfeld",
+        .long_name = NULL_IF_CONFIG_SMALL("farbfeld uncompressed image"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
+    },
 
     /* various PCM "codecs" */
     {
diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h
index 0ab1e34a61..d4b0d23f7e 100644
--- a/libavcodec/codec_id.h
+++ b/libavcodec/codec_id.h
@@ -322,6 +322,7 @@ enum AVCodecID {
     AV_CODEC_ID_RTV1,
     AV_CODEC_ID_VMIX,
     AV_CODEC_ID_LEAD,
+    AV_CODEC_ID_FARBFELD,
 
     /* various PCM "codecs" */
     AV_CODEC_ID_FIRST_AUDIO = 0x10000,     ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/farbfeldenc.c b/libavcodec/farbfeldenc.c
new file mode 100644
index 0000000000..9810ca8e4f
--- /dev/null
+++ b/libavcodec/farbfeldenc.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2024 Marcus B Spencer <marcus@marcusspencer.xyz>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the “Software”), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "libavutil/imgutils.h"
+#include "codec_internal.h"
+#include "bytestream.h"
+#include "avcodec.h"
+#include "encode.h"
+
+#define HEADER_SIZE 16
+#define PLANE_COUNT 4 // required by av_image_copy_to_buffer
+
+static int farbfeld_encode_frame(AVCodecContext *ctx, AVPacket *pkt,
+                                 const AVFrame *p, int *got_packet)
+{
+    int64_t raw_img_size = p->width * p->height * 8; // 8 bytes per pixel
+    int64_t buf_size = raw_img_size + HEADER_SIZE;
+    const uint8_t *planes[PLANE_COUNT];
+    uint8_t *buf;
+    int ret;
+
+    if (buf_size < 0)
+        return buf_size;
+
+    if ((ret = ff_get_encode_buffer(ctx, pkt, buf_size, 0)) < 0)
+        return ret;
+
+    buf = pkt->data;
+
+    bytestream_put_buffer(&buf, "farbfeld", 8);
+
+    bytestream_put_be32(&buf, ctx->width);
+    bytestream_put_be32(&buf, ctx->height);
+
+    for (int i = 0; i < PLANE_COUNT; ++i)
+        planes[i] = p->data[i];
+
+    av_image_copy_to_buffer(
+        buf,
+        raw_img_size,
+        planes,
+        p->linesize,
+        p->format,
+        p->width,
+        p->height,
+        1
+    );
+
+    *got_packet = 1;
+
+    return 0;
+}
+
+const FFCodec ff_farbfeld_encoder = {
+    .p.name         = "farbfeld",
+    CODEC_LONG_NAME("farbfeld uncompressed image"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_FARBFELD,
+    .p.capabilities = AV_CODEC_CAP_DR1,
+    FF_CODEC_ENCODE_CB(farbfeld_encode_frame),
+    .p.pix_fmts     = (const enum AVPixelFormat[]){
+        AV_PIX_FMT_RGBA64BE,
+        AV_PIX_FMT_NONE
+    },
+};
diff --git a/libavcodec/version.h b/libavcodec/version.h
index da54f87887..7acb261bb3 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -29,7 +29,7 @@
 
 #include "version_major.h"
 
-#define LIBAVCODEC_VERSION_MINOR   6
+#define LIBAVCODEC_VERSION_MINOR   7
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavformat/img2.c b/libavformat/img2.c
index 9981867f82..77edc7ff9b 100644
--- a/libavformat/img2.c
+++ b/libavformat/img2.c
@@ -95,6 +95,7 @@
     TAG(QOI,             qoi      ) \
     TAG(RADIANCE_HDR,    hdr      ) \
     TAG(WBMP,            wbmp     ) \
+    TAG(FARBFELD,        ff       ) \
     TAG(NONE,                     )
 
 #define LENGTH_CHECK(CODECID, STR) \
diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
index 526a11e5ee..13355a6fad 100644
--- a/libavformat/img2enc.c
+++ b/libavformat/img2enc.c
@@ -276,7 +276,7 @@ const FFOutputFormat ff_image2_muxer = {
     .p.long_name    = NULL_IF_CONFIG_SMALL("image2 sequence"),
     .p.extensions   = "bmp,dpx,exr,jls,jpeg,jpg,jxl,ljpg,pam,pbm,pcx,pfm,pgm,pgmyuv,phm,"
                       "png,ppm,sgi,tga,tif,tiff,jp2,j2c,j2k,xwd,sun,ras,rs,im1,im8,"
-                      "im24,sunras,vbn,xbm,xface,pix,y,avif,qoi,hdr,wbmp",
+                      "im24,sunras,vbn,xbm,xface,pix,y,avif,qoi,hdr,wbmp,ff",
     .priv_data_size = sizeof(VideoMuxData),
     .p.video_codec  = AV_CODEC_ID_MJPEG,
     .write_header   = write_header,
-- 
2.45.2

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