mirror of https://git.ffmpeg.org/ffmpeg.git
267 lines
8.2 KiB
C
267 lines
8.2 KiB
C
/*
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* Animated JPEG XL Demuxer
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* Copyright (c) 2023 Leo Izen (thebombzen)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Animated JPEG XL Demuxer
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* @see ISO/IEC 18181-1 and 18181-2
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*/
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#include <stdint.h>
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#include <string.h>
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#define BITSTREAM_READER_LE
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#include "libavcodec/get_bits.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "internal.h"
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#include "jpegxl_probe.h"
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typedef struct JXLAnimDemuxContext {
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AVBufferRef *initial;
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} JXLAnimDemuxContext;
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/*
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* copies as much of the codestream into the buffer as possible
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* pass a shorter buflen to request less
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* returns the number of bytes consumed from input, may be greater than input_len
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* if the input doesn't end on an ISOBMFF-box boundary
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*/
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static int jpegxl_collect_codestream_header(const uint8_t *input_buffer, int input_len, uint8_t *buffer, int buflen, int *copied) {
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const uint8_t *b = input_buffer;
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*copied = 0;
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while (1) {
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uint64_t size;
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uint32_t tag;
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int head_size = 8;
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if (b - input_buffer >= input_len - 16)
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break;
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size = AV_RB32(b);
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b += 4;
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if (size == 1) {
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size = AV_RB64(b);
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b += 8;
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head_size = 16;
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}
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/* invalid ISOBMFF size */
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if (size > 0 && size <= head_size)
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return AVERROR_INVALIDDATA;
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if (size > 0)
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size -= head_size;
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tag = AV_RL32(b);
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b += 4;
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if (tag == MKTAG('j', 'x', 'l', 'p')) {
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b += 4;
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size -= 4;
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}
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if (tag == MKTAG('j', 'x', 'l', 'c') || tag == MKTAG('j', 'x', 'l', 'p')) {
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/*
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* size = 0 means "until EOF". this is legal but uncommon
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* here we just set it to the remaining size of the probe buffer
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* which at this point should always be nonnegative
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*/
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if (size == 0 || size > input_len - (b - input_buffer))
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size = input_len - (b - input_buffer);
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if (size > buflen - *copied)
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size = buflen - *copied;
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/*
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* arbitrary chunking of the payload makes this memcpy hard to avoid
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* in practice this will only be performed one or two times at most
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*/
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memcpy(buffer + *copied, b, size);
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*copied += size;
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}
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b += size;
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if (b >= input_buffer + input_len || *copied >= buflen)
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break;
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}
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return b - input_buffer;
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}
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static int jpegxl_anim_probe(const AVProbeData *p)
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{
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uint8_t buffer[4096];
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int copied;
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/* this is a raw codestream */
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if (AV_RL16(p->buf) == FF_JPEGXL_CODESTREAM_SIGNATURE_LE) {
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if (ff_jpegxl_verify_codestream_header(p->buf, p->buf_size, 1) >= 1)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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/* not a JPEG XL file at all */
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if (AV_RL64(p->buf) != FF_JPEGXL_CONTAINER_SIGNATURE_LE)
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return 0;
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if (jpegxl_collect_codestream_header(p->buf, p->buf_size, buffer, sizeof(buffer), &copied) <= 0 || copied <= 0)
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return 0;
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if (ff_jpegxl_verify_codestream_header(buffer, copied, 0) >= 1)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int jpegxl_anim_read_header(AVFormatContext *s)
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{
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JXLAnimDemuxContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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int offset = 0;
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uint8_t head[256];
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int headsize = 0;
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int ctrl;
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AVRational tb;
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GetBitContext gbi, *gb = &gbi;
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uint64_t sig16 = avio_rl16(pb);
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if (sig16 == FF_JPEGXL_CODESTREAM_SIGNATURE_LE) {
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AV_WL16(head, sig16);
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headsize = avio_read(s->pb, head + 2, sizeof(head) - 2);
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if (headsize < 0)
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return headsize;
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headsize += 2;
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ctx->initial = av_buffer_alloc(headsize);
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if (!ctx->initial)
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return AVERROR(ENOMEM);
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memcpy(ctx->initial->data, head, headsize);
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} else {
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uint64_t sig64 = avio_rl64(pb);
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sig64 = (sig64 << 16) | sig16;
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if (sig64 != FF_JPEGXL_CONTAINER_SIGNATURE_LE)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 2); // first box always 12 bytes
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while (1) {
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int copied;
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uint8_t buf[4096];
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int read = avio_read(pb, buf, sizeof(buf));
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if (read < 0)
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return read;
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if (!ctx->initial) {
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ctx->initial = av_buffer_alloc(read + 12);
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if (!ctx->initial)
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return AVERROR(ENOMEM);
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AV_WL64(ctx->initial->data, FF_JPEGXL_CONTAINER_SIGNATURE_LE);
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AV_WL32(ctx->initial->data + 8, 0x0a870a0d);
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} else {
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/* this only should be happening zero or one times in practice */
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if (av_buffer_realloc(&ctx->initial, ctx->initial->size + read) < 0)
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return AVERROR(ENOMEM);
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}
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jpegxl_collect_codestream_header(buf, read, head + headsize, sizeof(head) - headsize, &copied);
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memcpy(ctx->initial->data + (ctx->initial->size - read), buf, read);
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headsize += copied;
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if (headsize >= sizeof(head) || read < sizeof(buf))
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break;
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}
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}
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/* offset in bits of the animation header */
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offset = ff_jpegxl_verify_codestream_header(head, headsize, 0);
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if (offset <= 0)
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return AVERROR_INVALIDDATA;
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if (init_get_bits8(gb, head, headsize) < 0)
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return AVERROR_INVALIDDATA;
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skip_bits_long(gb, offset);
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_JPEGXL;
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ctrl = get_bits(gb, 2);
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tb.den = (const uint32_t[]){100, 1000, 1, 1}[ctrl] + get_bits_long(gb, (const uint32_t[]){0, 0, 10, 30}[ctrl]);
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ctrl = get_bits(gb, 2);
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tb.num = (const uint32_t[]){1, 1001, 1, 1}[ctrl] + get_bits_long(gb, (const uint32_t[]){0, 0, 8, 10}[ctrl]);
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avpriv_set_pts_info(st, 1, tb.num, tb.den);
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return 0;
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}
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/* the decoder requires the full input file as a single packet */
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static int jpegxl_anim_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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JXLAnimDemuxContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret;
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int64_t size;
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size_t offset = 0;
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if ((size = avio_size(pb)) < 0)
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return size;
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/* animated JXL this big should not exist */
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if (size > INT_MAX)
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return AVERROR_INVALIDDATA;
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if (ctx->initial && size < ctx->initial->size)
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size = ctx->initial->size;
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if ((ret = av_new_packet(pkt, size) < 0))
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return ret;
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if (ctx->initial) {
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offset = ctx->initial->size;
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memcpy(pkt->data, ctx->initial->data, offset);
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av_buffer_unref(&ctx->initial);
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}
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if ((ret = avio_read(pb, pkt->data + offset, size - offset)) < 0)
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return ret;
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return 0;
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}
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static int jpegxl_anim_close(AVFormatContext *s)
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{
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JXLAnimDemuxContext *ctx = s->priv_data;
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if (ctx->initial)
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av_buffer_unref(&ctx->initial);
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return 0;
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}
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const AVInputFormat ff_jpegxl_anim_demuxer = {
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.name = "jpegxl_anim",
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.long_name = NULL_IF_CONFIG_SMALL("Animated JPEG XL"),
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.priv_data_size = sizeof(JXLAnimDemuxContext),
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.read_probe = jpegxl_anim_probe,
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.read_header = jpegxl_anim_read_header,
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.read_packet = jpegxl_anim_read_packet,
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.read_close = jpegxl_anim_close,
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.flags_internal = FF_FMT_INIT_CLEANUP,
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.flags = AVFMT_GENERIC_INDEX,
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.mime_type = "image/jxl",
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.extensions = "jxl",
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};
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