[deb_ffmpeg.git] / ffmpeg / tools / qt-faststart.c

/*
 * qt-faststart.c, v0.2
 * by Mike Melanson (melanson@pcisys.net)
 * This file is placed in the public domain. Use the program however you
 * see fit.
 *
 * This utility rearranges a Quicktime file such that the moov atom
 * is in front of the data, thus facilitating network streaming.
 *
 * To compile this program, start from the base directory from which you
 * are building FFmpeg and type:
 *  make tools/qt-faststart
 * The qt-faststart program will be built in the tools/ directory. If you
 * do not build the program in this manner, correct results are not
 * guaranteed, particularly on 64-bit platforms.
 * Invoke the program with:
 *  qt-faststart <infile.mov> <outfile.mov>
 *
 * Notes: Quicktime files can come in many configurations of top-level
 * atoms. This utility stipulates that the very last atom in the file needs
 * to be a moov atom. When given such a file, this utility will rearrange
 * the top-level atoms by shifting the moov atom from the back of the file
 * to the front, and patch the chunk offsets along the way. This utility
 * presently only operates on uncompressed moov atoms.
 */

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>

#ifdef __MINGW32__
#undef fseeko
#define fseeko(x, y, z) fseeko64(x, y, z)
#undef ftello
#define ftello(x)       ftello64(x)
#elif defined(_WIN32)
#undef fseeko
#define fseeko(x, y, z) _fseeki64(x, y, z)
#undef ftello
#define ftello(x)       _ftelli64(x)
#endif

#define MIN(a,b) ((a) > (b) ? (b) : (a))

#define BE_16(x) ((((uint8_t*)(x))[0] <<  8) | ((uint8_t*)(x))[1])

#define BE_32(x) (((uint32_t)(((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   33554432

int main(int argc, char *argv[])
{
    FILE *infile  = NULL;
    FILE *outfile = NULL;
    unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
    uint32_t atom_type   = 0;
    uint64_t atom_size   = 0;
    uint64_t atom_offset = 0;
    int64_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;
    int64_t start_offset = 0;
    unsigned char *copy_buffer = NULL;
    int bytes_to_copy;

    if (argc != 3) {
        printf("Usage: qt-faststart <infile.mov> <outfile.mov>\n"
               "Note: alternatively you can use -movflags +faststart in ffmpeg\n");
        return 0;
    }

    if (!strcmp(argv[1], argv[2])) {
        fprintf(stderr, "input and output files need to be different\n");
        return 1;
    }

    infile = fopen(argv[1], "rb");
    if (!infile) {
        perror(argv[1]);
        goto error_out;
    }

    /* traverse through the atoms in the file to make sure that 'moov' is
     * at the end */
    while (!feof(infile)) {
        if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
            break;
        }
        atom_size = 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" bytes for ftyp atom\n",
                       atom_size);
                goto error_out;
            }
            if (fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR) ||
                fread(ftyp_atom, atom_size, 1, infile) != 1 ||
                (start_offset = ftello(infile)) < 0) {
                perror(argv[1]);
                goto error_out;
            }
        } else {
            int ret;
            /* 64-bit special case */
            if (atom_size == 1) {
                if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
                    break;
                }
                atom_size = BE_64(&atom_bytes[0]);
                ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
            } else {
                ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
            }
            if (ret) {
                perror(argv[1]);
                goto error_out;
            }
        }
        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);
        fclose(infile);
        return 0;
    }

    /* moov atom was, in fact, the last atom in the chunk; load the whole
     * moov atom */
    if (fseeko(infile, -atom_size, SEEK_END)) {
        perror(argv[1]);
        goto error_out;
    }
    last_offset    = ftello(infile);
    if (last_offset < 0) {
        perror(argv[1]);
        goto error_out;
    }
    moov_atom_size = atom_size;
    moov_atom      = malloc(moov_atom_size);
    if (!moov_atom) {
        printf("could not allocate %"PRIu64" bytes for moov atom\n", atom_size);
        goto error_out;
    }
    if (fread(moov_atom, atom_size, 1, infile) != 1) {
        perror(argv[1]);
        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;
    }

    /* close; will be re-opened later */
    fclose(infile);
    infile = NULL;

    /* 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]);
            if (i + 12 + offset_count * UINT64_C(4) > moov_atom_size) {
                printf(" bad atom size/element count\n");
                goto error_out;
            }
            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]);
            if (i + 12 + offset_count * UINT64_C(8) > moov_atom_size) {
                printf(" bad atom size/element count\n");
                goto error_out;
            }
            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;
        }
    }

    /* re-open the input file and open the output file */
    infile = fopen(argv[1], "rb");
    if (!infile) {
        perror(argv[1]);
        goto error_out;
    }

    if (start_offset > 0) { /* seek after ftyp atom */
        if (fseeko(infile, start_offset, SEEK_SET)) {
            perror(argv[1]);
            goto error_out;
        }

        last_offset -= start_offset;
    }

    outfile = fopen(argv[2], "wb");
    if (!outfile) {
        perror(argv[2]);
        goto error_out;
    }

    /* dump the same ftyp atom */
    if (ftyp_atom_size > 0) {
        printf(" writing ftyp atom...\n");
        if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) {
            perror(argv[2]);
            goto error_out;
        }
    }

    /* dump the new moov atom */
    printf(" writing moov atom...\n");
    if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) {
        perror(argv[2]);
        goto error_out;
    }

    /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */
    bytes_to_copy = MIN(COPY_BUFFER_SIZE, last_offset);
    copy_buffer = malloc(bytes_to_copy);
    if (!copy_buffer) {
        printf("could not allocate %d bytes for copy_buffer\n", bytes_to_copy);
        goto error_out;
    }
    printf(" copying rest of file...\n");
    while (last_offset) {
        bytes_to_copy = MIN(bytes_to_copy, last_offset);

        if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) {
            perror(argv[1]);
            goto error_out;
        }
        if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) {
            perror(argv[2]);
            goto error_out;
        }
        last_offset -= bytes_to_copy;
    }

    fclose(infile);
    fclose(outfile);
    free(moov_atom);
    free(ftyp_atom);
    free(copy_buffer);

    return 0;

error_out:
    if (infile)
        fclose(infile);
    if (outfile)
        fclose(outfile);
    free(moov_atom);
    free(ftyp_atom);
    free(copy_buffer);
    return 1;
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* qt-faststart.c, v0.2
	3	* by Mike Melanson (melanson@pcisys.net)
	4	* This file is placed in the public domain. Use the program however you
	5	* see fit.
	6	*
	7	* This utility rearranges a Quicktime file such that the moov atom
	8	* is in front of the data, thus facilitating network streaming.
	9	*
	10	* To compile this program, start from the base directory from which you
	11	* are building FFmpeg and type:
	12	* make tools/qt-faststart
	13	* The qt-faststart program will be built in the tools/ directory. If you
	14	* do not build the program in this manner, correct results are not
	15	* guaranteed, particularly on 64-bit platforms.
	16	* Invoke the program with:
	17	* qt-faststart <infile.mov> <outfile.mov>
	18	*
	19	* Notes: Quicktime files can come in many configurations of top-level
	20	* atoms. This utility stipulates that the very last atom in the file needs
	21	* to be a moov atom. When given such a file, this utility will rearrange
	22	* the top-level atoms by shifting the moov atom from the back of the file
	23	* to the front, and patch the chunk offsets along the way. This utility
	24	* presently only operates on uncompressed moov atoms.
	25	*/
	26
	27	#include <stdio.h>
	28	#include <stdlib.h>
	29	#include <inttypes.h>
	30	#include <string.h>
	31
	32	#ifdef __MINGW32__
	33	#undef fseeko
	34	#define fseeko(x, y, z) fseeko64(x, y, z)
	35	#undef ftello
	36	#define ftello(x) ftello64(x)
	37	#elif defined(_WIN32)
	38	#undef fseeko
	39	#define fseeko(x, y, z) _fseeki64(x, y, z)
	40	#undef ftello
	41	#define ftello(x) _ftelli64(x)
	42	#endif
	43
	44	#define MIN(a,b) ((a) > (b) ? (b) : (a))
	45
	46	#define BE_16(x) ((((uint8_t)(x))[0] << 8) \| ((uint8_t)(x))[1])
	47
	48	#define BE_32(x) (((uint32_t)(((uint8_t*)(x))[0]) << 24) \| \
	49	(((uint8_t*)(x))[1] << 16) \| \
	50	(((uint8_t*)(x))[2] << 8) \| \
	51	((uint8_t*)(x))[3])
	52
	53	#define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) \| \
	54	((uint64_t)(((uint8_t*)(x))[1]) << 48) \| \
	55	((uint64_t)(((uint8_t*)(x))[2]) << 40) \| \
	56	((uint64_t)(((uint8_t*)(x))[3]) << 32) \| \
	57	((uint64_t)(((uint8_t*)(x))[4]) << 24) \| \
	58	((uint64_t)(((uint8_t*)(x))[5]) << 16) \| \
	59	((uint64_t)(((uint8_t*)(x))[6]) << 8) \| \
	60	((uint64_t)( (uint8_t*)(x))[7]))
	61
	62	#define BE_FOURCC(ch0, ch1, ch2, ch3) \
	63	( (uint32_t)(unsigned char)(ch3) \| \
	64	((uint32_t)(unsigned char)(ch2) << 8) \| \
65	((uint32_t)(unsigned char)(ch1) << 16) \| \
66	((uint32_t)(unsigned char)(ch0) << 24) )
67
68	#define QT_ATOM BE_FOURCC
69	/* top level atoms */
70	#define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e')
71	#define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k')
72	#define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't')
73	#define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v')
74	#define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't')
75	#define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p')
76	#define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e')
77	#define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T')
78	#define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p')
79	#define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd')
80
81	#define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v')
82	#define STCO_ATOM QT_ATOM('s', 't', 'c', 'o')
83	#define CO64_ATOM QT_ATOM('c', 'o', '6', '4')
84
85	#define ATOM_PREAMBLE_SIZE 8
86	#define COPY_BUFFER_SIZE 33554432
87
88	int main(int argc, char *argv[])
89	{
90	FILE *infile = NULL;
91	FILE *outfile = NULL;
92	unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
93	uint32_t atom_type = 0;
94	uint64_t atom_size = 0;
95	uint64_t atom_offset = 0;
96	int64_t last_offset;
97	unsigned char *moov_atom = NULL;
98	unsigned char *ftyp_atom = NULL;
99	uint64_t moov_atom_size;
100	uint64_t ftyp_atom_size = 0;
101	uint64_t i, j;
102	uint32_t offset_count;
103	uint64_t current_offset;
104	int64_t start_offset = 0;
105	unsigned char *copy_buffer = NULL;
106	int bytes_to_copy;
107
108	if (argc != 3) {
109	printf("Usage: qt-faststart <infile.mov> <outfile.mov>\n"
110	"Note: alternatively you can use -movflags +faststart in ffmpeg\n");
111	return 0;
112	}
113
114	if (!strcmp(argv[1], argv[2])) {
115	fprintf(stderr, "input and output files need to be different\n");
116	return 1;
117	}
118
119	infile = fopen(argv[1], "rb");
120	if (!infile) {
121	perror(argv[1]);
122	goto error_out;
123	}
124
125	/* traverse through the atoms in the file to make sure that 'moov' is
126	* at the end */
127	while (!feof(infile)) {
128	if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
129	break;
130	}
131	atom_size = BE_32(&atom_bytes[0]);
132	atom_type = BE_32(&atom_bytes[4]);
133
134	/* keep ftyp atom */
135	if (atom_type == FTYP_ATOM) {
136	ftyp_atom_size = atom_size;
137	free(ftyp_atom);
138	ftyp_atom = malloc(ftyp_atom_size);
139	if (!ftyp_atom) {
140	printf("could not allocate %"PRIu64" bytes for ftyp atom\n",
141	atom_size);
142	goto error_out;
143	}
144	if (fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR) \|\|
145	fread(ftyp_atom, atom_size, 1, infile) != 1 \|\|
146	(start_offset = ftello(infile)) < 0) {
147	perror(argv[1]);
148	goto error_out;
149	}
150	} else {
151	int ret;
152	/* 64-bit special case */
153	if (atom_size == 1) {
154	if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
155	break;
156	}
157	atom_size = BE_64(&atom_bytes[0]);
158	ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
159	} else {
160	ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
161	}
162	if (ret) {
163	perror(argv[1]);
164	goto error_out;
165	}
166	}
167	printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n",
168	(atom_type >> 24) & 255,
169	(atom_type >> 16) & 255,
170	(atom_type >> 8) & 255,
171	(atom_type >> 0) & 255,
172	atom_offset,
173	atom_size);
174	if ((atom_type != FREE_ATOM) &&
175	(atom_type != JUNK_ATOM) &&
176	(atom_type != MDAT_ATOM) &&
177	(atom_type != MOOV_ATOM) &&
178	(atom_type != PNOT_ATOM) &&
179	(atom_type != SKIP_ATOM) &&
180	(atom_type != WIDE_ATOM) &&
181	(atom_type != PICT_ATOM) &&
182	(atom_type != UUID_ATOM) &&
183	(atom_type != FTYP_ATOM)) {
184	printf("encountered non-QT top-level atom (is this a QuickTime file?)\n");
185	break;
186	}
187	atom_offset += atom_size;
188
189	/* The atom header is 8 (or 16 bytes), if the atom size (which
190	* includes these 8 or 16 bytes) is less than that, we won't be
191	* able to continue scanning sensibly after this atom, so break. */
192	if (atom_size < 8)
193	break;
194	}
195
196	if (atom_type != MOOV_ATOM) {
197	printf("last atom in file was not a moov atom\n");
198	free(ftyp_atom);
199	fclose(infile);
200	return 0;
201	}
202
203	/* moov atom was, in fact, the last atom in the chunk; load the whole
204	* moov atom */
205	if (fseeko(infile, -atom_size, SEEK_END)) {
206	perror(argv[1]);
207	goto error_out;
208	}
209	last_offset = ftello(infile);
210	if (last_offset < 0) {
211	perror(argv[1]);
212	goto error_out;
213	}
214	moov_atom_size = atom_size;
215	moov_atom = malloc(moov_atom_size);
216	if (!moov_atom) {
217	printf("could not allocate %"PRIu64" bytes for moov atom\n", atom_size);
218	goto error_out;
219	}
220	if (fread(moov_atom, atom_size, 1, infile) != 1) {
221	perror(argv[1]);
222	goto error_out;
223	}
224
225	/* this utility does not support compressed atoms yet, so disqualify
226	* files with compressed QT atoms */
227	if (BE_32(&moov_atom[12]) == CMOV_ATOM) {
228	printf("this utility does not support compressed moov atoms yet\n");
229	goto error_out;
230	}
231
232	/* close; will be re-opened later */
233	fclose(infile);
234	infile = NULL;
235
236	/* crawl through the moov chunk in search of stco or co64 atoms */
237	for (i = 4; i < moov_atom_size - 4; i++) {
238	atom_type = BE_32(&moov_atom[i]);
239	if (atom_type == STCO_ATOM) {
240	printf(" patching stco atom...\n");
241	atom_size = BE_32(&moov_atom[i - 4]);
242	if (i + atom_size - 4 > moov_atom_size) {
243	printf(" bad atom size\n");
244	goto error_out;
245	}
246	offset_count = BE_32(&moov_atom[i + 8]);
247	if (i + 12 + offset_count * UINT64_C(4) > moov_atom_size) {
248	printf(" bad atom size/element count\n");
249	goto error_out;
250	}
251	for (j = 0; j < offset_count; j++) {
252	current_offset = BE_32(&moov_atom[i + 12 + j * 4]);
253	current_offset += moov_atom_size;
254	moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF;
255	moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF;
256	moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF;
257	moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF;
258	}
259	i += atom_size - 4;
260	} else if (atom_type == CO64_ATOM) {
261	printf(" patching co64 atom...\n");
262	atom_size = BE_32(&moov_atom[i - 4]);
263	if (i + atom_size - 4 > moov_atom_size) {
264	printf(" bad atom size\n");
265	goto error_out;
266	}
267	offset_count = BE_32(&moov_atom[i + 8]);
268	if (i + 12 + offset_count * UINT64_C(8) > moov_atom_size) {
269	printf(" bad atom size/element count\n");
270	goto error_out;
271	}
272	for (j = 0; j < offset_count; j++) {
273	current_offset = BE_64(&moov_atom[i + 12 + j * 8]);
274	current_offset += moov_atom_size;
275	moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF;
276	moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF;
277	moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF;
278	moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF;
279	moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF;
280	moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF;
281	moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF;
282	moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF;
283	}
284	i += atom_size - 4;
285	}
286	}
287
288	/* re-open the input file and open the output file */
289	infile = fopen(argv[1], "rb");
290	if (!infile) {
291	perror(argv[1]);
292	goto error_out;
293	}
294
295	if (start_offset > 0) { /* seek after ftyp atom */
296	if (fseeko(infile, start_offset, SEEK_SET)) {
297	perror(argv[1]);
298	goto error_out;
299	}
300
301	last_offset -= start_offset;
302	}
303
304	outfile = fopen(argv[2], "wb");
305	if (!outfile) {
306	perror(argv[2]);
307	goto error_out;
308	}
309
310	/* dump the same ftyp atom */
311	if (ftyp_atom_size > 0) {
312	printf(" writing ftyp atom...\n");
313	if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) {
314	perror(argv[2]);
315	goto error_out;
316	}
317	}
318
319	/* dump the new moov atom */
320	printf(" writing moov atom...\n");
321	if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) {
322	perror(argv[2]);
323	goto error_out;
324	}
325
326	/* copy the remainder of the infile, from offset 0 -> last_offset - 1 */
327	bytes_to_copy = MIN(COPY_BUFFER_SIZE, last_offset);
328	copy_buffer = malloc(bytes_to_copy);
329	if (!copy_buffer) {
330	printf("could not allocate %d bytes for copy_buffer\n", bytes_to_copy);
331	goto error_out;
332	}
333	printf(" copying rest of file...\n");
334	while (last_offset) {
335	bytes_to_copy = MIN(bytes_to_copy, last_offset);
336
337	if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) {
338	perror(argv[1]);
339	goto error_out;
340	}
341	if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) {
342	perror(argv[2]);
343	goto error_out;
344	}
345	last_offset -= bytes_to_copy;
346	}
347
348	fclose(infile);
349	fclose(outfile);
350	free(moov_atom);
351	free(ftyp_atom);
352	free(copy_buffer);
353
354	return 0;
355
356	error_out:
357	if (infile)
358	fclose(infile);
359	if (outfile)
360	fclose(outfile);
361	free(moov_atom);
362	free(ftyp_atom);
363	free(copy_buffer);
364	return 1;
365	}