143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
//
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// bmffinfo.c: acquire information about BMFF files in JSON format
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//
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// Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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#include "info.h"
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#include <jv.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// --- ISO/IEC base media file format ------------------------------------------
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// ISO/IEC 14496-12:2015(E), used to be publicly available, now there's only:
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// https://mpeg.chiariglione.org/standards/mpeg-4/iso-base-media-file-format/text-isoiec-14496-12-5th-edition
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// but people have managed to archive the final version as well:
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// https://b.goeswhere.com/ISO_IEC_14496-12_2015.pdf
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//
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// ISO/IEC 23008-12:2017 Information technology -
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// High efficiency coding and media delivery in heterogeneous environments -
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// Part 12: Image File Format + Cor 1:2020 Technical Corrigendum 1
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// https://standards.iso.org/ittf/PubliclyAvailableStandards/
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static jv
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parse_bmff_box(jv o, const char *type, const uint8_t *data, size_t len)
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{
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// TODO(p): Parse out "uuid"'s uint8_t[16] initial field, present as hex.
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// TODO(p): Parse out "ftyp" contents: 14496-12:2015 4.3
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// TODO(p): Parse out other important boxes: 14496-12:2015 8+
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return add_to_subarray(o, "boxes", jv_string(type));
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}
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static jv
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parse_bmff(jv o, const uint8_t *p, size_t len)
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{
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// 4.2 Object Structure--this box need not be present, nor at the beginning
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// TODO(p): What does `aligned(8)` mean? It's probably in bits.
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if (len < 8 || memcmp(p + 4, "ftyp", 4))
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return add_error(o, "not BMFF at all or unsupported");
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const uint8_t *end = p + len;
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while (p < end) {
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if (end - p < 8) {
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o = add_warning(o, "box framing mismatch");
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break;
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}
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char type[5] = "";
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memcpy(type, p + 4, 4);
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uint64_t box_size = u32be(p);
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const uint8_t *data = p + 8;
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if (box_size == 1) {
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if (end - p < 16) {
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o = add_warning(o, "unexpected EOF");
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break;
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}
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box_size = u64be(data);
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data += 8;
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} else if (!box_size)
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box_size = end - p;
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if (box_size > (uint64_t) (end - p)) {
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o = add_warning(o, "unexpected EOF");
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break;
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}
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size_t data_len = box_size - (data - p);
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o = parse_bmff_box(o, type, data, data_len);
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p += box_size;
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}
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return o;
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}
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// --- I/O ---------------------------------------------------------------------
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static jv
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do_file(const char *filename, jv o)
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{
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const char *err = NULL;
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FILE *fp = fopen(filename, "rb");
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if (!fp) {
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err = strerror(errno);
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goto error;
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}
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uint8_t *data = NULL, buf[256 << 10];
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size_t n, len = 0;
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while ((n = fread(buf, sizeof *buf, sizeof buf / sizeof *buf, fp))) {
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data = realloc(data, len + n);
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memcpy(data + len, buf, n);
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len += n;
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}
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if (ferror(fp)) {
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err = strerror(errno);
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goto error_read;
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}
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o = parse_bmff(o, data, len);
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error_read:
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fclose(fp);
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free(data);
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error:
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if (err)
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o = add_error(o, err);
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return o;
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}
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int
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main(int argc, char *argv[])
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{
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(void) parse_icc;
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(void) parse_exif;
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(void) parse_psir;
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// XXX: Can't use `xargs -P0`, there's a risk of non-atomic writes.
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// Usage: find . -iname *.png -print0 | xargs -0 ./pnginfo
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for (int i = 1; i < argc; i++) {
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const char *filename = argv[i];
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jv o = jv_object();
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o = jv_object_set(o, jv_string("filename"), jv_string(filename));
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o = do_file(filename, o);
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jv_dumpf(o, stdout, 0 /* Might consider JV_PRINT_SORTED. */);
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fputc('\n', stdout);
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}
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return 0;
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}
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