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233 lines
4.9 KiB
233 lines
4.9 KiB
/*
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Copyright Jeroen Vreeken (jeroen@vreeken.net), 2018
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//#define TESTMAIN
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include "isom.h"
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struct fileparse {
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uint8_t *box;
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size_t cur_size;
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size_t box_size;
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ssize_t (*data_cb)(void *data, size_t size);
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int (*trigger_cb)(enum fileparse_trigger trig);
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};
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char *subbox[] = {
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"moov",
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"trak",
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"mdia",
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"minf",
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"stbl",
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"moof",
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"traf",
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};
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char *removebox[] = {
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"tfdt",
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};
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char *dumpbox[] = {
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"mvhd",
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"mfhd",
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"stts",
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"tfdt",
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// "trun",
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};
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void printbox(void *box, size_t *box_size, int level)
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{
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uint8_t *cbox = box;
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uint8_t *type = &cbox[4];
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char levelstr[level*2+1];
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memset(levelstr, ' ', level*2);
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levelstr[level*2] = 0;
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printf("%sbox: %c%c%c%c %zd\n", levelstr,
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type[0], type[1], type[2], type[3], *box_size);
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int i;
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bool has_subbox = false;
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for (i = 0; i < sizeof(subbox)/sizeof(subbox[0]); i++) {
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if (!memcmp(subbox[i], type, 4)) {
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has_subbox = true;
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}
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}
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bool is_removebox = false;
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for (i = 0; i < sizeof(removebox)/sizeof(removebox[0]); i++) {
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if (!memcmp(removebox[i], type, 4)) {
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is_removebox = true;
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}
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}
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bool is_dumpbox = false;
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for (i = 0; i < sizeof(dumpbox)/sizeof(dumpbox[0]); i++) {
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if (!memcmp(dumpbox[i], type, 4)) {
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is_dumpbox = true;
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}
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}
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if (is_dumpbox) {
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printf("%s ", levelstr);
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for (i = 0; i < *box_size; i++) {
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if (i == 8)
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printf(" ");
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printf("%02x", cbox[i]);
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}
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printf("\n");
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}
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if (is_removebox) {
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*box_size = 0;
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return;
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}
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size_t pos;
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if (has_subbox) for (pos = 8; pos < *box_size; ) {
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size_t subbox_size =
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(cbox[pos + 0] << 24) |
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(cbox[pos + 1] << 16) |
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(cbox[pos + 2] << 8) |
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(cbox[pos + 3] << 0);
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size_t org_size = subbox_size;
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printbox(&cbox[pos], &subbox_size, level+1);
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if (subbox_size < org_size) {
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size_t removed = org_size - subbox_size;
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memmove(&cbox[pos+subbox_size], &cbox[pos+removed], *box_size - (pos + removed));
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printf("%sremoved %zd, %zd <- %zd (%zd) %zd\n", levelstr, removed, pos, pos+removed, *box_size - (pos+removed), subbox_size);
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*box_size -= removed;
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}
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pos += subbox_size;
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}
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printf("%s%zd\n", levelstr, *box_size);
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cbox[0] = (*box_size >> 24) & 0xff;
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cbox[1] = (*box_size >> 16) & 0xff;
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cbox[2] = (*box_size >> 8) & 0xff;
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cbox[3] = (*box_size >> 0) & 0xff;
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}
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int isom_parse(struct fileparse *isom, void *buffer, size_t size)
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{
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char *cbuffer = buffer;
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while (size) {
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if (isom->cur_size < 4) {
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size_t copy = 4 - isom->cur_size;
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if (size < copy) {
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copy = size;
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}
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memcpy(&isom->box[isom->cur_size], cbuffer, copy);
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cbuffer += copy;
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size -= copy;
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isom->cur_size += copy;
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if (isom->cur_size == 4) {
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isom->box_size =
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(isom->box[0] << 24) |
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(isom->box[1] << 16) |
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(isom->box[2] << 8) |
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(isom->box[3] << 0);
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isom->box = realloc(isom->box, isom->box_size);
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}
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} else {
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size_t copy = isom->box_size - isom->cur_size;
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if (size < copy) {
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copy = size;
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}
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memcpy(&isom->box[isom->cur_size], cbuffer, copy);
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cbuffer += copy;
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size -= copy;
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isom->cur_size += copy;
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}
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if (isom->cur_size == isom->box_size) {
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printbox(isom->box, &isom->box_size, 0);
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write(2, isom->box, isom->box_size);
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isom->cur_size = 0;
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}
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}
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return 0;
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}
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struct fileparse *isom_create(
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ssize_t (*data_cb)(void *data, size_t size),
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int (*trigger_cb)(enum fileparse_trigger trig),
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int (**parse)(struct fileparse *mat, void *buffer, size_t size))
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{
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struct fileparse *isom;
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isom = calloc(sizeof(struct fileparse), 1);
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if (!isom)
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goto err;
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isom->box = malloc(4);
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*parse = isom_parse;
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isom->data_cb = data_cb;
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isom->trigger_cb = trigger_cb;
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err:
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return isom;
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}
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#ifdef TESTMAIN
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static ssize_t data_cb(void *data, size_t size)
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{
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printf("data: %zd\n", size);
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return size;
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}
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static int trigger_cb(enum fileparse_trigger trig)
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{
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printf("Trigger: %d\n", trig);
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return 0;
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}
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int main(int argc, char **argv)
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{
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char buffer[1000];
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ssize_t r;
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int (*parse)(struct fileparse *mat, void *buffer, size_t size);
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struct fileparse *isom = isom_create(data_cb, trigger_cb, &parse);
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do {
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r = read(0, buffer, 1000);
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if (r > 0) {
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isom_parse(isom, buffer, r);
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}
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} while (r > 0);
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return 0;
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}
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#endif
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