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 | } |