Add avif decoder binaries

codecs/avif_dec/README.md

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+# WebP decoder
+
+- Source: <https://github.com/webmproject/libwebp>
+- Version: v1.0.2
+
+## Example
+
+See `example.html`
+
+## API
+
+### `int version()`
+
+Returns the version of libwebp as a number. va.b.c is encoded as 0x0a0b0c
+
+### `RawImage decode(std::string buffer)`
+
+Decodes the given webp buffer into raw RGBA. `RawImage` is a class with 3 fields: `buffer`, `width`, and `height`.
+
+### `void free_result()`
+
+Frees the result created by `decode()`.

codecs/avif_dec/avif_dec.cpp

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+#include "avif/avif.h"
+#include <emscripten/bind.h>
+#include <emscripten/val.h>
+
+using namespace emscripten;
+
+class RawImage {
+public:
+  val buffer;
+  int width;
+  int height;
+
+  RawImage(val b, int w, int h) : buffer(b), width(w), height(h) {}
+};
+// NOTE: avifDecoderRead() offers the simplest means to get an avifImage that is
+// complete independent of an avifDecoder, but at the cost of additional
+// allocations and copies, and no support for image sequences. If you don't mind
+// keeping around the avifDecoder while you read in the image and/or need image
+// sequence support, skip ahead to the Advanced Decoding example. It is only one
+// additional function call, and the avifImage is owned by the avifDecoder.
+
+uint8_t *result;
+RawImage decode(std::string avifimage) {
+  // point raw.data and raw.size to the contents of an .avif(s)
+  avifROData raw;
+  raw.data = (uint8_t *)avifimage.c_str();
+  raw.size = avifimage.length();
+
+  avifImage *image = avifImageCreateEmpty();
+  avifDecoder *decoder = avifDecoderCreate();
+  avifResult decodeResult = avifDecoderRead(decoder, image, &raw);
+  if (decodeResult != AVIF_RESULT_OK) {
+    return RawImage(val::null(), -1, -1);
+    // printf("ERROR: Failed to decode: %s\n", avifResultToString(result));
+  }
+
+  int width = image->width;
+  int height = image->height;
+  int numBytes = width * height * 4;
+  result = new uint8_t[numBytes];
+
+  // image is an independent copy of decoded data, decoder may be destroyed here
+
+  // ... image->width;
+  // ... image->height;
+  // ... image->depth;     // If >8, all plane ptrs below are uint16_t*
+  // ... image->yuvFormat; // U and V planes might be smaller than Y based on
+  // format, use avifGetPixelFormatInfo() to find out in a generic way
+
+  // Option 1: Use YUV planes directly
+  // ... image->yuvPlanes;
+  // ... image->yuvRowBytes;
+
+  // Option 2: Convert to RGB and use RGB planes
+  avifImageYUVToRGB(image);
+  // ... image->rgbPlanes;
+  // ... image->rgbRowBytes;
+
+  for (int y = 0; y < height; y++) {
+    for (int x = 0; x < width; x++) {
+      int pixelOffset = y * image->width + x;
+      result[pixelOffset * 4 + 0] = image->rgbPlanes[0][pixelOffset];
+      result[pixelOffset * 4 + 1] = image->rgbPlanes[1][pixelOffset];
+      result[pixelOffset * 4 + 2] = image->rgbPlanes[2][pixelOffset];
+      if (image->alphaPlane) {
+        result[pixelOffset * 4 + 3] = image->alphaPlane[pixelOffset];
+      } else {
+        result[pixelOffset * 4 + 3] = 255;
+      }
+    }
+  }
+
+  // // Use alpha plane, if present
+  // if (image->alphaPlane) {
+  //     ... image->alphaPlane;
+  //     ... image->alphaRowBytes;
+  // }
+
+  avifImageDestroy(image);
+  avifDecoderDestroy(decoder);
+
+  return RawImage(val(typed_memory_view(numBytes, result)), (int)width,
+                  (int)height);
+}
+
+void free_result() { delete result; }
+
+EMSCRIPTEN_BINDINGS(my_module) {
+  class_<RawImage>("RawImage")
+      .property("buffer", &RawImage::buffer)
+      .property("width", &RawImage::width)
+      .property("height", &RawImage::height);
+
+  function("decode", &decode);
+  function("free_result", &free_result);
+}

codecs/avif_dec/avif_dec.d.ts

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+interface RawImage {
+  buffer: Uint8Array;
+  width: number;
+  height: number;
+}
+
+interface WebPModule extends EmscriptenWasm.Module {
+  decode(data: BufferSource): RawImage;
+  free_result(): void;
+}
+
+export default function(opts: EmscriptenWasm.ModuleOpts): WebPModule;
+

codecs/avif_dec/build.sh

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+#!/bin/bash
+
+set -e
+
+export OPTIMIZE="-Os"
+export LDFLAGS="${OPTIMIZE}"
+export CFLAGS="${OPTIMIZE}"
+export CPPFLAGS="${OPTIMIZE}"
+
+echo "============================================="
+echo "Compiling libaom"
+echo "============================================="
+(
+  cd node_modules/libavif/ext  
+  test -d aom || git clone -b v1.0.0-errata1-avif --depth 1 https://aomedia.googlesource.com/aom aom
+
+  cd aom
+  mkdir -p build.libavif
+  cd build.libavif
+
+  emcmake cmake \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DENABLE_CCACHE=0 \
+        -DAOM_TARGET_CPU=generic \
+        -DENABLE_DOCS=0 \
+        -DENABLE_TESTS=0 \
+        -DCONFIG_ACCOUNTING=1 \
+        -DCONFIG_INSPECTION=0 \
+        -DCONFIG_MULTITHREAD=0 \
+        -DCONFIG_RUNTIME_CPU_DETECT=0 \
+        -DCONFIG_WEBM_IO=0 \
+        ../
+
+  emmake make
+)
+echo "============================================="
+echo "Compiling libaom done"
+echo "============================================="
+
+echo "============================================="
+echo "Compiling libavif"
+echo "============================================="
+(
+  cd node_modules/libavif
+  mkdir -p build
+  cd build
+  emcmake cmake \
+    DCMAKE_BUILD_TYPE=Release \
+    -DAVIF_CODEC_AOM=1 \
+    -DAVIF_LOCAL_AOM=1 \
+    ../
+
+  emmake make
+)
+echo "============================================="
+echo "Compiling libavif done"
+echo "============================================="
+
+echo "============================================="
+echo "Compiling wasm bindings"
+echo "============================================="
+(
+   emcc \
+    ${OPTIMIZE} \
+    --bind \
+    -s ALLOW_MEMORY_GROWTH=1 \
+    -s MODULARIZE=1 \
+    -s 'EXPORT_NAME="avif_dec"' \
+    --std=c++11 \
+    -I ./node_modules/libavif/include \
+    -o ./avif_dec.js \
+    -x c++ \
+    avif_dec.cpp \
+    ./node_modules/libavif/build/libavif.a \
+    ./node_modules/libavif/ext/aom/build.libavif/libaom.a
+)
+echo "============================================="
+echo "Compiling wasm bindings done"
+echo "============================================="
+
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+echo "Did you update your docker image?"
+echo "Run \`docker pull trzeci/emscripten\`"
+echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"

codecs/avif_dec/example.html

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+<!doctype html>
+<script src='avif_dec.js'></script>
+<script>
+  const Module = avif_dec();
+
+  async function loadFile(src) {
+    const resp = await fetch(src);
+    return await resp.arrayBuffer();
+  }
+
+  Module.onRuntimeInitialized = async _ => {
+    const image = await loadFile('../example.avif');
+    const result = Module.decode(image);
+    console.log(result.width, result.height, result.buffer);
+    const imageData = new ImageData(new Uint8ClampedArray(result.buffer), result.width, result.height);
+    Module.free_result();
+    const canvas = document.createElement('canvas');
+    canvas.width = result.width;
+    canvas.height = result.height;
+    document.body.appendChild(canvas);
+    const ctx = canvas.getContext('2d');
+    ctx.putImageData(imageData, 0, 0);
+  };
+</script>

codecs/avif_dec/package.json

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+{
+  "name": "avif_dec",
+  "scripts": {
+    "install": "napa",
+    "build": "docker run --rm -v $(pwd):/src trzeci/emscripten ./build.sh"
+  },
+  "napa": {
+    "libavif": "AOMediaCodec/libavif#v0.5.4"
+  },
+  "devDependencies": {
+    "napa": "3.0.0"
+  }
+}