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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. The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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The licenses for most software are designed to take away your freedom to share
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of this License.

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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# qt-faststart # 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]);
}