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/*
* Animated JPEG XL Demuxer
* Copyright (c) 2023 Leo Izen (thebombzen)
*
* 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
*/
/**
* @file
* Animated JPEG XL Demuxer
* @see ISO/IEC 18181-1 and 18181-2
*/
#include <stdint.h>
#include <string.h>
#include "libavcodec/jpegxl.h"
#include "libavcodec/jpegxl_parse.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
typedef struct JXLAnimDemuxContext {
AVBufferRef *initial;
} JXLAnimDemuxContext;
static int jpegxl_anim_probe(const AVProbeData *p)
{
uint8_t buffer[4096 + AV_INPUT_BUFFER_PADDING_SIZE];
int copied = 0, ret;
FFJXLMetadata meta = { 0 };
/* this is a raw codestream */
if (AV_RL16(p->buf) == FF_JPEGXL_CODESTREAM_SIGNATURE_LE) {
ret = ff_jpegxl_parse_codestream_header(p->buf, p->buf_size, &meta, 5);
if (ret >= 0 && meta.animation_offset > 0)
return AVPROBE_SCORE_MAX;
return 0;
}
/* not a JPEG XL file at all */
if (AV_RL64(p->buf) != FF_JPEGXL_CONTAINER_SIGNATURE_LE)
return 0;
if (ff_jpegxl_collect_codestream_header(p->buf, p->buf_size, buffer,
sizeof(buffer) - AV_INPUT_BUFFER_PADDING_SIZE, &copied) <= 0
|| copied <= 0)
return 0;
ret = ff_jpegxl_parse_codestream_header(buffer, copied, &meta, 10);
if (ret >= 0 && meta.animation_offset > 0)
return AVPROBE_SCORE_MAX;
return 0;
}
static int jpegxl_anim_read_header(AVFormatContext *s)
{
JXLAnimDemuxContext *ctx = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
uint8_t head[256 + AV_INPUT_BUFFER_PADDING_SIZE];
const int sizeofhead = sizeof(head) - AV_INPUT_BUFFER_PADDING_SIZE;
int headsize = 0, ret;
FFJXLMetadata meta = { 0 };
uint64_t sig16 = avio_rl16(pb);
if (sig16 == FF_JPEGXL_CODESTREAM_SIGNATURE_LE) {
AV_WL16(head, sig16);
headsize = avio_read(s->pb, head + 2, sizeofhead - 2);
if (headsize < 0)
return headsize;
headsize += 2;
ctx->initial = av_buffer_alloc(headsize);
if (!ctx->initial)
return AVERROR(ENOMEM);
memcpy(ctx->initial->data, head, headsize);
} else {
uint64_t sig64 = avio_rl64(pb);
sig64 = (sig64 << 16) | sig16;
if (sig64 != FF_JPEGXL_CONTAINER_SIGNATURE_LE)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2); // first box always 12 bytes
while (1) {
int copied = 0;
uint8_t buf[4096];
int read = avio_read(pb, buf, sizeof(buf));
if (read < 0)
return read;
if (!ctx->initial) {
ctx->initial = av_buffer_alloc(read + 12);
if (!ctx->initial)
return AVERROR(ENOMEM);
AV_WL64(ctx->initial->data, FF_JPEGXL_CONTAINER_SIGNATURE_LE);
AV_WL32(ctx->initial->data + 8, 0x0a870a0d);
} else {
/* this only should be happening zero or one times in practice */
if (av_buffer_realloc(&ctx->initial, ctx->initial->size + read) < 0)
return AVERROR(ENOMEM);
}
ff_jpegxl_collect_codestream_header(buf, read, head + headsize, sizeofhead - headsize, &copied);
memcpy(ctx->initial->data + (ctx->initial->size - read), buf, read);
headsize += copied;
if (headsize >= sizeofhead || read < sizeof(buf))
break;
}
}
/* offset in bits of the animation header */
ret = ff_jpegxl_parse_codestream_header(head, headsize, &meta, 0);
if (ret < 0 || meta.animation_offset <= 0)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_JPEGXL;
avpriv_set_pts_info(st, 1, meta.timebase.num, meta.timebase.den);
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
return 0;
}
/* the decoder requires the full input file as a single packet */
static int jpegxl_anim_read_packet(AVFormatContext *s, AVPacket *pkt)
{
JXLAnimDemuxContext *ctx = s->priv_data;
AVIOContext *pb = s->pb;
int ret;
int64_t size;
size_t offset = 0;
size = avio_size(pb);
if (size < 0)
return size;
if (size == 0)
size = 4096;
if (ctx->initial && size < ctx->initial->size)
size = ctx->initial->size;
ret = av_new_packet(pkt, size);
if (ret < 0)
return ret;
if (ctx->initial) {
offset = ctx->initial->size;
memcpy(pkt->data, ctx->initial->data, offset);
av_buffer_unref(&ctx->initial);
}
ret = avio_read(pb, pkt->data + offset, size - offset);
if (ret < 0)
return ret;
if (ret < size - offset)
pkt->size = ret + offset;
return 0;
}
static int jpegxl_anim_close(AVFormatContext *s)
{
JXLAnimDemuxContext *ctx = s->priv_data;
if (ctx->initial)
av_buffer_unref(&ctx->initial);
return 0;
}
const AVInputFormat ff_jpegxl_anim_demuxer = {
.name = "jpegxl_anim",
.long_name = NULL_IF_CONFIG_SMALL("Animated JPEG XL"),
.priv_data_size = sizeof(JXLAnimDemuxContext),
.read_probe = jpegxl_anim_probe,
.read_header = jpegxl_anim_read_header,
.read_packet = jpegxl_anim_read_packet,
.read_close = jpegxl_anim_close,
.flags_internal = FF_FMT_INIT_CLEANUP,
.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
.mime_type = "image/jxl",
.extensions = "jxl",
};
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