| 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 | } |