blob: 97be019c585ef4ab9d18018f29d992148e6de125
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 | } |
366 |