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• File: class-avif-info.php
<?php
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/**
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* Copyright (c) 2021, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*
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* Note: this class is from libavifinfo - https://aomedia.googlesource.com/libavifinfo/+/refs/heads/main/avifinfo.php at f509487.
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* It is used as a fallback to parse AVIF files when the server doesn't support AVIF,
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* primarily to identify the width and height of the image.
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*
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* Note PHP 8.2 added native support for AVIF, so this class can be removed when WordPress requires PHP 8.2.
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*/
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namespace Avifinfo;
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const FOUND = 0; // Input correctly parsed and information retrieved.
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const NOT_FOUND = 1; // Input correctly parsed but information is missing or elsewhere.
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const TRUNCATED = 2; // Input correctly parsed until missing bytes to continue.
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const ABORTED = 3; // Input correctly parsed until stopped to avoid timeout or crash.
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const INVALID = 4; // Input incorrectly parsed.
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const MAX_SIZE = 4294967295; // Unlikely to be insufficient to parse AVIF headers.
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const MAX_NUM_BOXES = 4096; // Be reasonable. Avoid timeouts and out-of-memory.
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const MAX_VALUE = 255;
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const MAX_TILES = 16;
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const MAX_PROPS = 32;
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const MAX_FEATURES = 8;
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const UNDEFINED = 0; // Value was not yet parsed.
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/**
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* Reads an unsigned integer with most significant bits first.
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*
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* @param binary string $input Must be at least $num_bytes-long.
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* @param int $num_bytes Number of parsed bytes.
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* @return int Value.
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*/
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function read_big_endian( $input, $num_bytes ) {
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if ( $num_bytes == 1 ) {
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return unpack( 'C', $input ) [1];
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} else if ( $num_bytes == 2 ) {
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return unpack( 'n', $input ) [1];
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} else if ( $num_bytes == 3 ) {
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$bytes = unpack( 'C3', $input );
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return ( $bytes[1] << 16 ) | ( $bytes[2] << 8 ) | $bytes[3];
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} else { // $num_bytes is 4
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// This might fail to read unsigned values >= 2^31 on 32-bit systems.
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// See https://www.php.net/manual/en/function.unpack.php#106041
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return unpack( 'N', $input ) [1];
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}
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}
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/**
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* Reads bytes and advances the stream position by the same count.
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*
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* @param stream $handle Bytes will be read from this resource.
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* @param int $num_bytes Number of bytes read. Must be greater than 0.
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* @return binary string|false The raw bytes or false on failure.
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*/
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function read( $handle, $num_bytes ) {
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$data = fread( $handle, $num_bytes );
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return ( $data !== false && strlen( $data ) >= $num_bytes ) ? $data : false;
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}
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/**
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* Advances the stream position by the given offset.
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*
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* @param stream $handle Bytes will be skipped from this resource.
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* @param int $num_bytes Number of skipped bytes. Can be 0.
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* @return bool True on success or false on failure.
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*/
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// Skips 'num_bytes' from the 'stream'. 'num_bytes' can be zero.
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function skip( $handle, $num_bytes ) {
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return ( fseek( $handle, $num_bytes, SEEK_CUR ) == 0 );
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}
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//------------------------------------------------------------------------------
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// Features are parsed into temporary property associations.
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class Tile { // Tile item id <-> parent item id associations.
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public $tile_item_id;
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public $parent_item_id;
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}
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class Prop { // Property index <-> item id associations.
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public $property_index;
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public $item_id;
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}
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class Dim_Prop { // Property <-> features associations.
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public $property_index;
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public $width;
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public $height;
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}
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class Chan_Prop { // Property <-> features associations.
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public $property_index;
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public $bit_depth;
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public $num_channels;
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}
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class Features {
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public $has_primary_item = false; // True if "pitm" was parsed.
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public $has_alpha = false; // True if an alpha "auxC" was parsed.
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public $primary_item_id;
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public $primary_item_features = array( // Deduced from the data below.
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'width' => UNDEFINED, // In number of pixels.
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'height' => UNDEFINED, // Ignores mirror and rotation.
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'bit_depth' => UNDEFINED, // Likely 8, 10 or 12 bits per channel per pixel.
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'num_channels' => UNDEFINED // Likely 1, 2, 3 or 4 channels:
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// (1 monochrome or 3 colors) + (0 or 1 alpha)
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);
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public $tiles = array(); // Tile[]
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public $props = array(); // Prop[]
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public $dim_props = array(); // Dim_Prop[]
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public $chan_props = array(); // Chan_Prop[]
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/**
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* Binds the width, height, bit depth and number of channels from stored internal features.
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*
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* @param int $target_item_id Id of the item whose features will be bound.
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* @param int $tile_depth Maximum recursion to search within tile-parent relations.
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* @return Status FOUND on success or NOT_FOUND on failure.
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*/
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private function get_item_features( $target_item_id, $tile_depth ) {
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foreach ( $this->props as $prop ) {
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if ( $prop->item_id != $target_item_id ) {
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continue;
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}
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// Retrieve the width and height of the primary item if not already done.
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if ( $target_item_id == $this->primary_item_id &&
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( $this->primary_item_features['width'] == UNDEFINED ||
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$this->primary_item_features['height'] == UNDEFINED ) ) {
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foreach ( $this->dim_props as $dim_prop ) {
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if ( $dim_prop->property_index != $prop->property_index ) {
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continue;
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}
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$this->primary_item_features['width'] = $dim_prop->width;
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$this->primary_item_features['height'] = $dim_prop->height;
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if ( $this->primary_item_features['bit_depth'] != UNDEFINED &&
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$this->primary_item_features['num_channels'] != UNDEFINED ) {
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return FOUND;
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}
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break;
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}
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}
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// Retrieve the bit depth and number of channels of the target item if not
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// already done.
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if ( $this->primary_item_features['bit_depth'] == UNDEFINED ||
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$this->primary_item_features['num_channels'] == UNDEFINED ) {
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foreach ( $this->chan_props as $chan_prop ) {
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if ( $chan_prop->property_index != $prop->property_index ) {
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continue;
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}
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$this->primary_item_features['bit_depth'] = $chan_prop->bit_depth;
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$this->primary_item_features['num_channels'] = $chan_prop->num_channels;
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if ( $this->primary_item_features['width'] != UNDEFINED &&
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$this->primary_item_features['height'] != UNDEFINED ) {
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return FOUND;
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}
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break;
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}
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}
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}
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// Check for the bit_depth and num_channels in a tile if not yet found.
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if ( $tile_depth < 3 ) {
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foreach ( $this->tiles as $tile ) {
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if ( $tile->parent_item_id != $target_item_id ) {
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continue;
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}
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$status = $this->get_item_features( $tile->tile_item_id, $tile_depth + 1 );
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if ( $status != NOT_FOUND ) {
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return $status;
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}
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}
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}
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return NOT_FOUND;
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}
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/**
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* Finds the width, height, bit depth and number of channels of the primary item.
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*
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* @return Status FOUND on success or NOT_FOUND on failure.
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*/
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public function get_primary_item_features() {
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// Nothing to do without the primary item ID.
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if ( !$this->has_primary_item ) {
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return NOT_FOUND;
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}
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// Early exit.
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if ( empty( $this->dim_props ) || empty( $this->chan_props ) ) {
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return NOT_FOUND;
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}
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$status = $this->get_item_features( $this->primary_item_id, /*tile_depth=*/ 0 );
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if ( $status != FOUND ) {
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return $status;
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}
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// "auxC" is parsed before the "ipma" properties so it is known now, if any.
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if ( $this->has_alpha ) {
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++$this->primary_item_features['num_channels'];
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}
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return FOUND;
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}
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}
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//------------------------------------------------------------------------------
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class Box {
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public $size; // In bytes.
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public $type; // Four characters.
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public $version; // 0 or actual version if this is a full box.
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public $flags; // 0 or actual value if this is a full box.
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public $content_size; // 'size' minus the header size.
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/**
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* Reads the box header.
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*
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* @param stream $handle The resource the header will be parsed from.
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* @param int $num_parsed_boxes The total number of parsed boxes. Prevents timeouts.
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* @param int $num_remaining_bytes The number of bytes that should be available from the resource.
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* @return Status FOUND on success or an error on failure.
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*/
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public function parse( $handle, &$num_parsed_boxes, $num_remaining_bytes = MAX_SIZE ) {
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// See ISO/IEC 14496-12:2012(E) 4.2
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$header_size = 8; // box 32b size + 32b type (at least)
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if ( $header_size > $num_remaining_bytes ) {
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return INVALID;
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}
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if ( !( $data = read( $handle, 8 ) ) ) {
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return TRUNCATED;
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}
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$this->size = read_big_endian( $data, 4 );
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$this->type = substr( $data, 4, 4 );
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// 'box->size==1' means 64-bit size should be read after the box type.
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// 'box->size==0' means this box extends to all remaining bytes.
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if ( $this->size == 1 ) {
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$header_size += 8;
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if ( $header_size > $num_remaining_bytes ) {
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return INVALID;
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}
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if ( !( $data = read( $handle, 8 ) ) ) {
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return TRUNCATED;
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}
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// Stop the parsing if any box has a size greater than 4GB.
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if ( read_big_endian( $data, 4 ) != 0 ) {
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return ABORTED;
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}
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// Read the 32 least-significant bits.
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$this->size = read_big_endian( substr( $data, 4, 4 ), 4 );
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} else if ( $this->size == 0 ) {
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$this->size = $num_remaining_bytes;
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}
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if ( $this->size < $header_size ) {
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return INVALID;
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}
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if ( $this->size > $num_remaining_bytes ) {
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return INVALID;
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}
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$has_fullbox_header = $this->type == 'meta' || $this->type == 'pitm' ||
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$this->type == 'ipma' || $this->type == 'ispe' ||
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$this->type == 'pixi' || $this->type == 'iref' ||
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$this->type == 'auxC';
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if ( $has_fullbox_header ) {
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$header_size += 4;
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}
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if ( $this->size < $header_size ) {
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return INVALID;
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}
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$this->content_size = $this->size - $header_size;
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// Avoid timeouts. The maximum number of parsed boxes is arbitrary.
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++$num_parsed_boxes;
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if ( $num_parsed_boxes >= MAX_NUM_BOXES ) {
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return ABORTED;
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}
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$this->version = 0;
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$this->flags = 0;
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if ( $has_fullbox_header ) {
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if ( !( $data = read( $handle, 4 ) ) ) {
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return TRUNCATED;
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}
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$this->version = read_big_endian( $data, 1 );
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$this->flags = read_big_endian( substr( $data, 1, 3 ), 3 );
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// See AV1 Image File Format (AVIF) 8.1
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// at https://aomediacodec.github.io/av1-avif/#avif-boxes (available when
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// https://github.com/AOMediaCodec/av1-avif/pull/170 is merged).
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$is_parsable = ( $this->type == 'meta' && $this->version <= 0 ) ||
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( $this->type == 'pitm' && $this->version <= 1 ) ||
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( $this->type == 'ipma' && $this->version <= 1 ) ||
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( $this->type == 'ispe' && $this->version <= 0 ) ||
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( $this->type == 'pixi' && $this->version <= 0 ) ||
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( $this->type == 'iref' && $this->version <= 1 ) ||
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( $this->type == 'auxC' && $this->version <= 0 );
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// Instead of considering this file as invalid, skip unparsable boxes.
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if ( !$is_parsable ) {
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$this->type = 'unknownversion';
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}
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}
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// print_r( $this ); // Uncomment to print all boxes.
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return FOUND;
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}
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}
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//------------------------------------------------------------------------------
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class Parser {
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private $handle; // Input stream.
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private $num_parsed_boxes = 0;
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private $data_was_skipped = false;
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public $features;
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function __construct( $handle ) {
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$this->handle = $handle;
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$this->features = new Features();
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}
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/**
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* Parses an "ipco" box.
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*
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* "ispe" is used for width and height, "pixi" and "av1C" are used for bit depth
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* and number of channels, and "auxC" is used for alpha.
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*
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* @param stream $handle The resource the box will be parsed from.
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* @param int $num_remaining_bytes The number of bytes that should be available from the resource.
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* @return Status FOUND on success or an error on failure.
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*/
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private function parse_ipco( $num_remaining_bytes ) {
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$box_index = 1; // 1-based index. Used for iterating over properties.
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do {
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$box = new Box();
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$status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
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if ( $status != FOUND ) {
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return $status;
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}
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if ( $box->type == 'ispe' ) {
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// See ISO/IEC 23008-12:2017(E) 6.5.3.2
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if ( $box->content_size < 8 ) {
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return INVALID;
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}
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if ( !( $data = read( $this->handle, 8 ) ) ) {
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return TRUNCATED;
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}
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$width = read_big_endian( substr( $data, 0, 4 ), 4 );
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$height = read_big_endian( substr( $data, 4, 4 ), 4 );
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if ( $width == 0 || $height == 0 ) {
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return INVALID;
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}
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if ( count( $this->features->dim_props ) <= MAX_FEATURES &&
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$box_index <= MAX_VALUE ) {
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$dim_prop_count = count( $this->features->dim_props );
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$this->features->dim_props[$dim_prop_count] = new Dim_Prop();
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$this->features->dim_props[$dim_prop_count]->property_index = $box_index;
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$this->features->dim_props[$dim_prop_count]->width = $width;
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$this->features->dim_props[$dim_prop_count]->height = $height;
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} else {
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$this->data_was_skipped = true;
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}
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if ( !skip( $this->handle, $box->content_size - 8 ) ) {
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return TRUNCATED;
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}
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} else if ( $box->type == 'pixi' ) {
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// See ISO/IEC 23008-12:2017(E) 6.5.6.2
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if ( $box->content_size < 1 ) {
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return INVALID;
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}
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if ( !( $data = read( $this->handle, 1 ) ) ) {
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return TRUNCATED;
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}
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$num_channels = read_big_endian( $data, 1 );
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if ( $num_channels < 1 ) {
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return INVALID;
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}
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if ( $box->content_size < 1 + $num_channels ) {
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return INVALID;
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}
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if ( !( $data = read( $this->handle, 1 ) ) ) {
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return TRUNCATED;
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}
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$bit_depth = read_big_endian( $data, 1 );
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if ( $bit_depth < 1 ) {
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return INVALID;
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}
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for ( $i = 1; $i < $num_channels; ++$i ) {
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if ( !( $data = read( $this->handle, 1 ) ) ) {
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return TRUNCATED;
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}
[395] Fix | Delete
// Bit depth should be the same for all channels.
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if ( read_big_endian( $data, 1 ) != $bit_depth ) {
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return INVALID;
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}
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if ( $i > 32 ) {
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return ABORTED; // Be reasonable.
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}
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}
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if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
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$box_index <= MAX_VALUE && $bit_depth <= MAX_VALUE &&
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$num_channels <= MAX_VALUE ) {
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$chan_prop_count = count( $this->features->chan_props );
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$this->features->chan_props[$chan_prop_count] = new Chan_Prop();
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$this->features->chan_props[$chan_prop_count]->property_index = $box_index;
[409] Fix | Delete
$this->features->chan_props[$chan_prop_count]->bit_depth = $bit_depth;
[410] Fix | Delete
$this->features->chan_props[$chan_prop_count]->num_channels = $num_channels;
[411] Fix | Delete
} else {
[412] Fix | Delete
$this->data_was_skipped = true;
[413] Fix | Delete
}
[414] Fix | Delete
if ( !skip( $this->handle, $box->content_size - ( 1 + $num_channels ) ) ) {
[415] Fix | Delete
return TRUNCATED;
[416] Fix | Delete
}
[417] Fix | Delete
} else if ( $box->type == 'av1C' ) {
[418] Fix | Delete
// See AV1 Codec ISO Media File Format Binding 2.3.1
[419] Fix | Delete
// at https://aomediacodec.github.io/av1-isobmff/#av1c
[420] Fix | Delete
// Only parse the necessary third byte. Assume that the others are valid.
[421] Fix | Delete
if ( $box->content_size < 3 ) {
[422] Fix | Delete
return INVALID;
[423] Fix | Delete
}
[424] Fix | Delete
if ( !( $data = read( $this->handle, 3 ) ) ) {
[425] Fix | Delete
return TRUNCATED;
[426] Fix | Delete
}
[427] Fix | Delete
$byte = read_big_endian( substr( $data, 2, 1 ), 1 );
[428] Fix | Delete
$high_bitdepth = ( $byte & 0x40 ) != 0;
[429] Fix | Delete
$twelve_bit = ( $byte & 0x20 ) != 0;
[430] Fix | Delete
$monochrome = ( $byte & 0x10 ) != 0;
[431] Fix | Delete
if ( $twelve_bit && !$high_bitdepth ) {
[432] Fix | Delete
return INVALID;
[433] Fix | Delete
}
[434] Fix | Delete
if ( count( $this->features->chan_props ) <= MAX_FEATURES &&
[435] Fix | Delete
$box_index <= MAX_VALUE ) {
[436] Fix | Delete
$chan_prop_count = count( $this->features->chan_props );
[437] Fix | Delete
$this->features->chan_props[$chan_prop_count] = new Chan_Prop();
[438] Fix | Delete
$this->features->chan_props[$chan_prop_count]->property_index = $box_index;
[439] Fix | Delete
$this->features->chan_props[$chan_prop_count]->bit_depth =
[440] Fix | Delete
$high_bitdepth ? $twelve_bit ? 12 : 10 : 8;
[441] Fix | Delete
$this->features->chan_props[$chan_prop_count]->num_channels = $monochrome ? 1 : 3;
[442] Fix | Delete
} else {
[443] Fix | Delete
$this->data_was_skipped = true;
[444] Fix | Delete
}
[445] Fix | Delete
if ( !skip( $this->handle, $box->content_size - 3 ) ) {
[446] Fix | Delete
return TRUNCATED;
[447] Fix | Delete
}
[448] Fix | Delete
} else if ( $box->type == 'auxC' ) {
[449] Fix | Delete
// See AV1 Image File Format (AVIF) 4
[450] Fix | Delete
// at https://aomediacodec.github.io/av1-avif/#auxiliary-images
[451] Fix | Delete
$kAlphaStr = "urn:mpeg:mpegB:cicp:systems:auxiliary:alpha\0";
[452] Fix | Delete
$kAlphaStrLength = 44; // Includes terminating character.
[453] Fix | Delete
if ( $box->content_size >= $kAlphaStrLength ) {
[454] Fix | Delete
if ( !( $data = read( $this->handle, $kAlphaStrLength ) ) ) {
[455] Fix | Delete
return TRUNCATED;
[456] Fix | Delete
}
[457] Fix | Delete
if ( substr( $data, 0, $kAlphaStrLength ) == $kAlphaStr ) {
[458] Fix | Delete
// Note: It is unlikely but it is possible that this alpha plane does
[459] Fix | Delete
// not belong to the primary item or a tile. Ignore this issue.
[460] Fix | Delete
$this->features->has_alpha = true;
[461] Fix | Delete
}
[462] Fix | Delete
if ( !skip( $this->handle, $box->content_size - $kAlphaStrLength ) ) {
[463] Fix | Delete
return TRUNCATED;
[464] Fix | Delete
}
[465] Fix | Delete
} else {
[466] Fix | Delete
if ( !skip( $this->handle, $box->content_size ) ) {
[467] Fix | Delete
return TRUNCATED;
[468] Fix | Delete
}
[469] Fix | Delete
}
[470] Fix | Delete
} else {
[471] Fix | Delete
if ( !skip( $this->handle, $box->content_size ) ) {
[472] Fix | Delete
return TRUNCATED;
[473] Fix | Delete
}
[474] Fix | Delete
}
[475] Fix | Delete
++$box_index;
[476] Fix | Delete
$num_remaining_bytes -= $box->size;
[477] Fix | Delete
} while ( $num_remaining_bytes > 0 );
[478] Fix | Delete
return NOT_FOUND;
[479] Fix | Delete
}
[480] Fix | Delete
[481] Fix | Delete
/**
[482] Fix | Delete
* Parses an "iprp" box.
[483] Fix | Delete
*
[484] Fix | Delete
* The "ipco" box contain the properties which are linked to items by the "ipma" box.
[485] Fix | Delete
*
[486] Fix | Delete
* @param stream $handle The resource the box will be parsed from.
[487] Fix | Delete
* @param int $num_remaining_bytes The number of bytes that should be available from the resource.
[488] Fix | Delete
* @return Status FOUND on success or an error on failure.
[489] Fix | Delete
*/
[490] Fix | Delete
private function parse_iprp( $num_remaining_bytes ) {
[491] Fix | Delete
do {
[492] Fix | Delete
$box = new Box();
[493] Fix | Delete
$status = $box->parse( $this->handle, $this->num_parsed_boxes, $num_remaining_bytes );
[494] Fix | Delete
if ( $status != FOUND ) {
[495] Fix | Delete
return $status;
[496] Fix | Delete
}
[497] Fix | Delete
[498] Fix | Delete
if ( $box->type == 'ipco' ) {
[499] Fix | Delete
12
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
Function