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Your New SJW Waifu 2021-04-05 12:15:24 -05:00
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GNU GENERAL PUBLIC LICENSE
Copyright (C) 2008 - 2013 Daniel G. Taylor <dan@programmer-art.org>
Version 2, June 1991
Permission is hereby granted, free of charge, to any person obtaining a copy
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Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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10
Makefile Executable file
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CC=gcc
all:
$(CC) -o qt-faststart qt-faststart.c
$(CC) -o oqt-faststart oqt-faststart.c
$(CC) -o test test.c
clean:
rm -f qt-faststart
rm -f oqt-faststart

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README.md Normal file → Executable file
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@ -1,2 +1,20 @@
# qt-faststart
- this source code is originated from ffmpeg project. This is the only one C program that read moov atom metada from Quick Time movies file (.mov, mp4) which does not use any external source code and libraries, just standard C Library.
- The difference from ffmpeg's source code is:
1. it uses open/close/lseek/read from ``fcntl.h`` instead of flose/fopen/fseeko/ftello.
2. it read/modify/write mp4 file in-place instead of writing output into another file.
3. it will be merge into ``nginx_http_mp4_module``, in order to play mp4 file immediately instead of downloading the whole file (in case moov atom was placed in the last)
To compile:
Run ``make``
To use:
``./qt-faststart demo3.mp4``
Easy, right?

BIN
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qt-faststart.c Executable file
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#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#ifdef __MINGW32__
#define fseeko(x,y,z) fseeko64(x,y,z)
#define ftello(x) ftello64(x)
#endif
#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \
(((uint8_t*)(x))[1] << 16) | \
(((uint8_t*)(x))[2] << 8) | \
((uint8_t*)(x))[3])
#define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) | \
((uint64_t)(((uint8_t*)(x))[1]) << 48) | \
((uint64_t)(((uint8_t*)(x))[2]) << 40) | \
((uint64_t)(((uint8_t*)(x))[3]) << 32) | \
((uint64_t)(((uint8_t*)(x))[4]) << 24) | \
((uint64_t)(((uint8_t*)(x))[5]) << 16) | \
((uint64_t)(((uint8_t*)(x))[6]) << 8) | \
((uint64_t)((uint8_t*)(x))[7]))
#define BE_FOURCC( ch0, ch1, ch2, ch3 ) \
( (uint32_t)(unsigned char)(ch3) | \
( (uint32_t)(unsigned char)(ch2) << 8 ) | \
( (uint32_t)(unsigned char)(ch1) << 16 ) | \
( (uint32_t)(unsigned char)(ch0) << 24 ) )
#define QT_ATOM BE_FOURCC
/* top level atoms */
#define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e')
#define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k')
#define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't')
#define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v')
#define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't')
#define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p')
#define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e')
#define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T')
#define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p')
#define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd')
#define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v')
#define STCO_ATOM QT_ATOM('s', 't', 'c', 'o')
#define CO64_ATOM QT_ATOM('c', 'o', '6', '4')
#define ATOM_PREAMBLE_SIZE 8
#define COPY_BUFFER_SIZE 1024
int fixForFastPlayback(char* path) {
unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
uint32_t atom_type = 0;
uint64_t atom_size = 0;
uint64_t atom_offset = 0;
uint64_t last_offset;
unsigned char *moov_atom = NULL;
unsigned char *ftyp_atom = NULL;
uint64_t moov_atom_size;
uint64_t ftyp_atom_size = 0;
uint64_t i, j;
uint32_t offset_count;
uint64_t current_offset;
uint64_t start_offset = 0;
int infile_fd, outfile_fd;
unsigned char *temp_buf = NULL;
/* open file using open instead of fopen*/
infile_fd = open(path, O_RDONLY, S_IRGRP);
if (infile_fd < 0) {
perror(path);
goto error_out;
}
/* traverse through the atoms in the file to make sure that 'moov' is
* at the end */
while (1) {
ssize_t r;
r = read(infile_fd, atom_bytes, ATOM_PREAMBLE_SIZE);
if (r == 0) break;
atom_size = (uint32_t) BE_32(&atom_bytes[0]);
atom_type = BE_32(&atom_bytes[4]);
/* keep ftyp atom */
if (atom_type == FTYP_ATOM) {
ftyp_atom_size = atom_size;
free(ftyp_atom);
ftyp_atom = malloc(ftyp_atom_size);
if (!ftyp_atom) {
printf("could not allocate %"PRIu64" byte for ftyp atom\n",
atom_size);
goto error_out;
}
start_offset = lseek(infile_fd, -ATOM_PREAMBLE_SIZE, SEEK_CUR);
printf("start_offset before verify: %"PRIu64" \n", start_offset);
r = read(infile_fd, ftyp_atom, atom_size);
if (r < 0) {
perror(path);
goto error_out;
}
printf("atom_size: %"PRIu64" \n", atom_size);
start_offset = atom_size;
printf("start_offset to verify: %"PRIu64" \n", start_offset);
} else {
/* 64-bit special case */
if (atom_size == 1) {
if (read(infile_fd, atom_bytes, ATOM_PREAMBLE_SIZE) == 0) {
break;
}
atom_size = BE_64(&atom_bytes[0]);
lseek(infile_fd, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
} else {
lseek(infile_fd, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
}
}
printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n",
(atom_type >> 24) & 255,
(atom_type >> 16) & 255,
(atom_type >> 8) & 255,
(atom_type >> 0) & 255,
atom_offset,
atom_size);
if ((atom_type != FREE_ATOM) &&
(atom_type != JUNK_ATOM) &&
(atom_type != MDAT_ATOM) &&
(atom_type != MOOV_ATOM) &&
(atom_type != PNOT_ATOM) &&
(atom_type != SKIP_ATOM) &&
(atom_type != WIDE_ATOM) &&
(atom_type != PICT_ATOM) &&
(atom_type != UUID_ATOM) &&
(atom_type != FTYP_ATOM)) {
printf("encountered non-QT top-level atom (is this a Quicktime file?)\n");
break;
}
atom_offset += atom_size;
/* The atom header is 8 (or 16 bytes), if the atom size (which
* includes these 8 or 16 bytes) is less than that, we won't be
* able to continue scanning sensibly after this atom, so break. */
if (atom_size < 8)
break;
}
if (atom_type != MOOV_ATOM) {
printf("last atom in file was not a moov atom\n");
free(ftyp_atom);
close(infile_fd);
return 0;
}
/* moov atom was, in fact, the last atom in the chunk; load the whole
* moov atom */
last_offset = lseek(infile_fd, -atom_size, SEEK_END);
printf("last_offset: %"PRIu64" \n", last_offset);
moov_atom_size = atom_size;
moov_atom = malloc(moov_atom_size);
if (!moov_atom) {
printf("could not allocate %"PRIu64" byte for moov atom\n",
atom_size);
goto error_out;
}
if (read(infile_fd, moov_atom, atom_size) < 0) {
perror(path);
goto error_out;
}
/* this utility does not support compressed atoms yet, so disqualify
* files with compressed QT atoms */
if (BE_32(&moov_atom[12]) == CMOV_ATOM) {
printf("this utility does not support compressed moov atoms yet\n");
goto error_out;
}
/* read next move_atom_size bytes
* since we read/write file in same time, we must read before write into
* the buffer
*/
temp_buf = malloc(moov_atom_size);
if (!temp_buf) {
printf("Cannot allocate %"PRIu64" byte for temp buf \n", moov_atom_size);
goto error_out;
}
/* seek to after ftyp_atom */
lseek(infile_fd, ftyp_atom_size, SEEK_SET);
if (read(infile_fd, temp_buf, moov_atom_size) < 0) {
perror(path);
goto error_out;
}
start_offset += moov_atom_size;
/* end read temp buffer bytes */
/* close; will be re-opened later */
close(infile_fd);
/* crawl through the moov chunk in search of stco or co64 atoms */
for (i = 4; i < moov_atom_size - 4; i++) {
atom_type = BE_32(&moov_atom[i]);
if (atom_type == STCO_ATOM) {
printf(" patching stco atom...\n");
atom_size = BE_32(&moov_atom[i - 4]);
if (i + atom_size - 4 > moov_atom_size) {
printf(" bad atom size\n");
goto error_out;
}
offset_count = BE_32(&moov_atom[i + 8]);
for (j = 0; j < offset_count; j++) {
current_offset = BE_32(&moov_atom[i + 12 + j * 4]);
current_offset += moov_atom_size;
moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF;
moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF;
moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF;
moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF;
}
i += atom_size - 4;
} else if (atom_type == CO64_ATOM) {
printf(" patching co64 atom...\n");
atom_size = BE_32(&moov_atom[i - 4]);
if (i + atom_size - 4 > moov_atom_size) {
printf(" bad atom size\n");
goto error_out;
}
offset_count = BE_32(&moov_atom[i + 8]);
for (j = 0; j < offset_count; j++) {
current_offset = BE_64(&moov_atom[i + 12 + j * 8]);
current_offset += moov_atom_size;
moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF;
moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF;
moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF;
moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF;
moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF;
moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF;
moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF;
moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF;
}
i += atom_size - 4;
}
}
infile_fd = open(path, O_RDONLY);
if (infile_fd < 0) {
perror(path);
goto error_out;
}
printf("start_offset after patching %"PRIu64" \n", start_offset);
if (start_offset > 0) { /* seek after ftyp atom */
lseek(infile_fd, start_offset, SEEK_SET);
last_offset -= start_offset;
}
printf("last_offset: %"PRIu64" \n", last_offset);
outfile_fd = open(path, O_WRONLY);
printf("outfile fd: %d\n", outfile_fd);
if (outfile_fd < 0) {
perror(path);
goto error_out;
}
ssize_t written;
/* dump the same ftyp atom */
if (ftyp_atom_size > 0) {
printf(" writing ftyp atom...\n");
written = write(outfile_fd, ftyp_atom, ftyp_atom_size);
if (written < 0) {
perror(path);
goto error_out;
}
}
printf("bytes written: %zu \n", written);
i = 0;
/*
we must use 2 buffer to read/write
*/
printf("moov_atom_size: %"PRIu64" \n", moov_atom_size);
while (last_offset) {
ssize_t r;
if (i == 0) {
printf("writing moov atom...\n");
}
written = write(outfile_fd, moov_atom, moov_atom_size);
if (written < 0) {
perror(path);
goto error_out;
}
if (last_offset < moov_atom_size) {
moov_atom_size = last_offset;
}
r = read(infile_fd, moov_atom, moov_atom_size);
if (r < 0) {
perror(path);
goto error_out;
}
/*this do the trick*/
if (i == 1) {
last_offset -= moov_atom_size;
}
i = 1;
written = write(outfile_fd, temp_buf, moov_atom_size);
if (written < 0) {
perror(path);
goto error_out;
}
if (last_offset < moov_atom_size) {
moov_atom_size = last_offset;
}
r = read(infile_fd, temp_buf, moov_atom_size);
if (r < 0) {
perror(path);
goto error_out;
}
last_offset -= moov_atom_size;
}
close(infile_fd);
close(outfile_fd);
free(moov_atom);
free(ftyp_atom);
free(temp_buf);
return 0;
/* clean up */
error_out:
if (infile_fd > 0) {
close(infile_fd);
}
if (outfile_fd > 0) {
close(outfile_fd);
}
if (moov_atom) {
free(moov_atom);
}
if (ftyp_atom) {
free(ftyp_atom);
}
if (temp_buf) {
free(temp_buf);
}
return 1;
}
int main(int argc, char* argv[]) {
fixForFastPlayback(argv[1]);
}