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ffmpeg/libavcodec/jpegxl_parse.c

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/*
* JPEG XL Header Parser
* Copyright (c) 2023 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
*/
#include <stdint.h>
#include "bytestream.h"
#define UNCHECKED_BITSTREAM_READER 0
#define BITSTREAM_READER_LE
#include "get_bits.h"
#include "jpegxl.h"
#include "jpegxl_parse.h"
/* read a U32(c_i + u(u_i)) */
static av_always_inline uint32_t jxl_u32(GetBitContext *gb,
uint32_t c0, uint32_t c1, uint32_t c2, uint32_t c3,
uint32_t u0, uint32_t u1, uint32_t u2, uint32_t u3)
{
const uint32_t constants[4] = {c0, c1, c2, c3};
const uint32_t ubits [4] = {u0, u1, u2, u3};
uint32_t ret, choice = get_bits(gb, 2);
ret = constants[choice];
if (ubits[choice])
ret += get_bits_long(gb, ubits[choice]);
return ret;
}
static av_always_inline uint32_t jxl_enum(GetBitContext *gb)
{
return jxl_u32(gb, 0, 1, 2, 18, 0, 0, 4, 6);
}
/* read a U64() */
static uint64_t jxl_u64(GetBitContext *gb)
{
uint64_t shift = 12, ret;
switch (get_bits(gb, 2)) {
case 1:
ret = 1 + get_bits(gb, 4);
break;
case 2:
ret = 17 + get_bits(gb, 8);
break;
case 3:
ret = get_bits(gb, 12);
while (get_bits1(gb)) {
if (shift < 60) {
ret |= (uint64_t)get_bits(gb, 8) << shift;
shift += 8;
} else {
ret |= (uint64_t)get_bits(gb, 4) << shift;
break;
}
}
break;
default:
ret = 0;
}
return ret;
}
static uint32_t jpegxl_width_from_ratio(uint32_t height, int ratio)
{
uint64_t height64 = height; /* avoid integer overflow */
switch (ratio) {
case 1:
return height;
case 2:
return (uint32_t)((height64 * 12) / 10);
case 3:
return (uint32_t)((height64 * 4) / 3);
case 4:
return (uint32_t)((height64 * 3) / 2);
case 5:
return (uint32_t)((height64 * 16) / 9);
case 6:
return (uint32_t)((height64 * 5) / 4);
case 7:
return (uint32_t)(height64 * 2);
default:
break;
}
return 0; /* manual width */
}
/**
* validate a Jpeg XL Size Header
* @return >= 0 upon valid size, < 0 upon invalid size found
*/
static int jpegxl_read_size_header(GetBitContext *gb, FFJXLMetadata *meta, int validate)
{
uint32_t width, height;
if (get_bits1(gb)) {
/* small size header */
height = (get_bits(gb, 5) + 1) << 3;
width = jpegxl_width_from_ratio(height, get_bits(gb, 3));
if (!width)
width = (get_bits(gb, 5) + 1) << 3;
} else {
/* large size header */
height = 1 + jxl_u32(gb, 0, 0, 0, 0, 9, 13, 18, 30);
width = jpegxl_width_from_ratio(height, get_bits(gb, 3));
if (!width)
width = 1 + jxl_u32(gb, 0, 0, 0, 0, 9, 13, 18, 30);
}
if (validate && (width > (1 << 18) || height > (1 << 18)
|| (width >> 4) * (height >> 4) > (1 << 20)))
return AVERROR_INVALIDDATA;
if (meta) {
meta->width = meta->coded_width = width;
meta->height = meta->coded_height = height;
}
return 0;
}
/**
* validate a Jpeg XL Preview Header
* @return >= 0 upon valid size, < 0 upon invalid size found
*/
static int jpegxl_read_preview_header(GetBitContext *gb, int validate)
{
uint32_t width, height;
if (get_bits1(gb)) {
/* coded height and width divided by eight */
height = jxl_u32(gb, 16, 32, 1, 33, 0, 0, 5, 9) << 3;
width = jpegxl_width_from_ratio(height, get_bits(gb, 3));
if (!width)
width = jxl_u32(gb, 16, 32, 1, 33, 0, 0, 5, 9) << 3;
} else {
/* full height and width coded */
height = jxl_u32(gb, 1, 65, 321, 1345, 6, 8, 10, 12);
width = jpegxl_width_from_ratio(height, get_bits(gb, 3));
if (!width)
width = jxl_u32(gb, 1, 65, 321, 1345, 6, 8, 10, 12);
}
if (validate && (width > 4096 || height > 4096))
return AVERROR_INVALIDDATA;
return 0;
}
/**
* get a Jpeg XL BitDepth Header. These cannot be invalid.
*/
static void jpegxl_get_bit_depth(GetBitContext *gb, FFJXLMetadata *meta)
{
int bit_depth;
if (get_bits1(gb)) {
/* float samples */
bit_depth = jxl_u32(gb, 32, 16, 24, 1, 0, 0, 0, 6); /* mantissa */
skip_bits_long(gb, 4); /* exponent */
} else {
/* integer samples */
bit_depth = jxl_u32(gb, 8, 10, 12, 1, 0, 0, 0, 6);
}
if (meta)
meta->bit_depth = bit_depth;
}
/**
* validate a Jpeg XL Extra Channel Info bundle
* @return >= 0 upon valid, < 0 upon invalid
*/
static int jpegxl_read_extra_channel_info(GetBitContext *gb, FFJXLMetadata *meta, int validate)
{
int default_alpha = get_bits1(gb);
uint32_t type, name_len = 0;
if (!default_alpha) {
type = jxl_enum(gb);
if (validate && type > 63)
return AVERROR_INVALIDDATA; /* enum types cannot be 64+ */
if (validate && validate < 10 && type == JPEGXL_CT_BLACK)
return AVERROR_INVALIDDATA;
jpegxl_get_bit_depth(gb, NULL);
jxl_u32(gb, 0, 3, 4, 1, 0, 0, 0, 3); /* dim-shift */
/* max of name_len is 1071 = 48 + 2^10 - 1 */
name_len = 8 * jxl_u32(gb, 0, 0, 16, 48, 0, 4, 5, 10);
} else {
type = JPEGXL_CT_ALPHA;
}
if (get_bits_left(gb) < name_len)
return AVERROR_BUFFER_TOO_SMALL;
/* skip over the name */
skip_bits_long(gb, name_len);
if (!default_alpha && type == JPEGXL_CT_ALPHA)
skip_bits1(gb);
if (type == JPEGXL_CT_SPOT_COLOR)
skip_bits_long(gb, 16 * 4);
if (type == JPEGXL_CT_CFA)
jxl_u32(gb, 1, 0, 3, 19, 0, 2, 4, 8);
if (meta && type == JPEGXL_CT_ALPHA)
meta->have_alpha = 1;
return 0;
}
static int jpegxl_skip_extensions(GetBitContext *gb)
{
uint64_t extensions = jxl_u64(gb), extensions_len = 0;
if (get_bits_left(gb) <= 0)
return AVERROR_BUFFER_TOO_SMALL;
if (!extensions)
return 0;
for (int i = 0; i < 64; i++) {
if (extensions & (UINT64_C(1) << i))
extensions_len += jxl_u64(gb);
if (get_bits_left(gb) <= 0)
return AVERROR_BUFFER_TOO_SMALL;
}
if (extensions_len > INT_MAX || get_bits_left(gb) <= extensions_len)
return AVERROR_BUFFER_TOO_SMALL;
skip_bits_long(gb, extensions_len);
return 0;
}
int ff_jpegxl_parse_codestream_header(const uint8_t *buf, int buflen, FFJXLMetadata *meta, int validate)
{
GetBitContext gbi, *gb = &gbi;
int all_default, extra_fields = 0;
int xyb_encoded = 1, have_icc_profile = 0;
int animation_offset = 0, have_timecodes = 0;
FFJXLPrimaries primaries = JPEGXL_PR_SRGB;
FFJXLTransferCharacteristic trc = JPEGXL_TR_SRGB + (1U << 24);
FFJXLWhitePoint white_point = JPEGXL_WP_D65;
FFJXLColorSpace color_space = JPEGXL_CS_RGB;
AVRational tb;
uint32_t num_extra_channels = 0;
int ret;
ret = init_get_bits8(gb, buf, buflen);
if (ret < 0)
return ret;
if (get_bits(gb, 16) != FF_JPEGXL_CODESTREAM_SIGNATURE_LE && validate)
return AVERROR_INVALIDDATA;
ret = jpegxl_read_size_header(gb, meta, validate);
if (ret < 0)
return ret;
all_default = get_bits1(gb);
if (!all_default)
extra_fields = get_bits1(gb);
if (extra_fields) {
int orientation = get_bits(gb, 3);
if (orientation > 3 && meta)
FFSWAP(uint32_t, meta->width, meta->height);
/*
* intrinstic size
* any size header here is valid, but as it
* is variable length we have to read it
*/
if (get_bits1(gb))
jpegxl_read_size_header(gb, NULL, 0);
/* preview header */
if (get_bits1(gb)) {
ret = jpegxl_read_preview_header(gb, 0);
if (ret < 0)
return ret;
}
/* animation header */
if (get_bits1(gb)) {
animation_offset = get_bits_count(gb);
tb.den = jxl_u32(gb, 100, 1000, 1, 1, 0, 0, 10, 30);
tb.num = jxl_u32(gb, 1, 1001, 1, 1, 0, 0, 8, 10);
jxl_u32(gb, 0, 0, 0, 0, 0, 3, 16, 32);
have_timecodes = get_bits1(gb);
}
}
if (animation_offset && meta) {
meta->animation_offset = animation_offset;
meta->timebase = tb;
meta->have_timecodes = have_timecodes;
}
if (get_bits_left(gb) <= 0)
return AVERROR_BUFFER_TOO_SMALL;
if (!all_default) {
jpegxl_get_bit_depth(gb, meta);
/* modular_16bit_buffers must equal 1 */
if (!get_bits1(gb) && validate && validate < 10)
return AVERROR_INVALIDDATA;
num_extra_channels = jxl_u32(gb, 0, 1, 2, 1, 0, 0, 4, 12);
if (num_extra_channels > 4 && validate && validate < 10)
return AVERROR_INVALIDDATA;
for (uint32_t i = 0; i < num_extra_channels; i++) {
ret = jpegxl_read_extra_channel_info(gb, meta, validate);
if (ret < 0)
return ret;
if (get_bits_left(gb) <= 0)
return AVERROR_BUFFER_TOO_SMALL;
}
xyb_encoded = get_bits1(gb);
/* color encoding bundle */
if (!get_bits1(gb)) {
have_icc_profile = get_bits1(gb);
color_space = jxl_enum(gb);
if (color_space > 63 && validate)
return AVERROR_INVALIDDATA;
if (!have_icc_profile) {
if (color_space != JPEGXL_CS_XYB) {
white_point = jxl_enum(gb);
if (white_point > 63 && validate)
return AVERROR_INVALIDDATA;
if (white_point == JPEGXL_WP_CUSTOM) {
/* ux and uy values */
jxl_u32(gb, 0, 524288, 1048576, 2097152, 19, 19, 20, 21);
jxl_u32(gb, 0, 524288, 1048576, 2097152, 19, 19, 20, 21);
}
if (color_space != JPEGXL_CS_GRAY) {
/* primaries */
primaries = jxl_enum(gb);
if (primaries > 63 && validate)
return AVERROR_INVALIDDATA;
if (primaries == JPEGXL_PR_CUSTOM) {
/* ux/uy values for r,g,b */
for (int i = 0; i < 6; i++) {
jxl_u32(gb, 0, 524288, 1048576, 2097152, 19, 19, 20, 21);
if (get_bits_left(gb) <= 0)
return AVERROR_BUFFER_TOO_SMALL;
}
}
}
}
/* transfer characteristics */
if (get_bits1(gb)) {
/* gamma */
trc = get_bits(gb, 24);
} else {
/* transfer function */
trc = jxl_enum(gb);
if (trc > 63 && validate)
return AVERROR_INVALIDDATA;
trc += (1U << 24);
}
/* rendering intent */
if (jxl_enum(gb) > 63 && validate)
return AVERROR_INVALIDDATA;
}
}
/* tone mapping bundle */
if (extra_fields && !get_bits1(gb))
skip_bits_long(gb, 16 + 16 + 1 + 16);
ret = jpegxl_skip_extensions(gb);
if (ret < 0)
return ret;
}
if (meta) {
meta->xyb_encoded = xyb_encoded;
meta->have_icc_profile = have_icc_profile;
meta->csp = color_space;
meta->primaries = primaries;
meta->wp = white_point;
meta->trc = trc;
if (!meta->bit_depth)
meta->bit_depth = 8;
meta->num_extra_channels = num_extra_channels;
}
/* default transform */
if (!get_bits1(gb)) {
/* opsin inverse matrix */
if (xyb_encoded && !get_bits1(gb))
skip_bits_long(gb, 16 * 16);
/* cw_mask and default weights */
if (get_bits1(gb))
skip_bits_long(gb, 16 * 15);
if (get_bits1(gb))
skip_bits_long(gb, 16 * 55);
if (get_bits1(gb))
skip_bits_long(gb, 16 * 210);
}
if (!have_icc_profile) {
int bits_remaining = 7 - ((get_bits_count(gb) - 1) & 0x7);
if (bits_remaining && get_bits(gb, bits_remaining))
return AVERROR_INVALIDDATA;
}
if (get_bits_left(gb) < 0)
return AVERROR_BUFFER_TOO_SMALL;
return get_bits_count(gb);
}
/*
* copies as much of the codestream into the buffer as possible
* pass a shorter buflen to request less
* returns the number of bytes consumed from input, may be greater than input_len
* if the input doesn't end on an ISOBMFF-box boundary
*/
int ff_jpegxl_collect_codestream_header(const uint8_t *input_buffer, int input_len,
uint8_t *buffer, int buflen, int *copied)
{
GetByteContext gb;
int pos = 0, last_box = 0;
bytestream2_init(&gb, input_buffer, input_len);
while (1) {
uint64_t size;
uint32_t tag;
int head_size = 8;
if (bytestream2_get_bytes_left(&gb) < 8)
return AVERROR_BUFFER_TOO_SMALL;
size = bytestream2_get_be32(&gb);
tag = bytestream2_get_le32(&gb);
if (size == 1) {
if (bytestream2_get_bytes_left(&gb) < 8)
return AVERROR_BUFFER_TOO_SMALL;
size = bytestream2_get_be64(&gb);
head_size = 16;
}
/* invalid ISOBMFF size */
if (size && size <= head_size)
return AVERROR_INVALIDDATA;
if (size)
size -= head_size;
if (tag == MKTAG('j','x','l','p')) {
uint32_t idx;
if (bytestream2_get_bytes_left(&gb) < 4)
return AVERROR_BUFFER_TOO_SMALL;
idx = bytestream2_get_be32(&gb);
if (idx >= UINT32_C(0x80000000))
last_box = 1;
if (size) {
if (size <= 4)
return AVERROR_INVALIDDATA;
size -= 4;
}
}
if (tag == MKTAG('j','x','l','c'))
last_box = 1;
/*
* size = 0 means "until EOF". this is legal but uncommon
* here we just set it to the remaining size of the probe buffer
*/
if (!size)
size = bytestream2_get_bytes_left(&gb);
else
pos += size + head_size;
if (tag == MKTAG('j','x','l','c') || tag == MKTAG('j','x','l','p')) {
if (size > buflen - *copied)
size = buflen - *copied;
/*
* arbitrary chunking of the payload makes this memcpy hard to avoid
* in practice this will only be performed one or two times at most
*/
*copied += bytestream2_get_buffer(&gb, buffer + *copied, size);
} else {
bytestream2_skip(&gb, size);
}
if (last_box || bytestream2_get_bytes_left(&gb) <= 0 || *copied >= buflen)
break;
}
return pos;
}
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