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 31#ifdef __MINGW32__ 32#define fseeko(x,y,z) fseeko64(x,y,z) 33#define ftello(x) ftello64(x) 34#endif 35 36#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) 37#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \ 38 (((uint8_t*)(x))[1] << 16) | \ 39 (((uint8_t*)(x))[2] << 8) | \ 40 ((uint8_t*)(x))[3]) 41#define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) | \ 42 ((uint64_t)(((uint8_t*)(x))[1]) << 48) | \ 43 ((uint64_t)(((uint8_t*)(x))[2]) << 40) | \ 44 ((uint64_t)(((uint8_t*)(x))[3]) << 32) | \ 45 ((uint64_t)(((uint8_t*)(x))[4]) << 24) | \ 46 ((uint64_t)(((uint8_t*)(x))[5]) << 16) | \ 47 ((uint64_t)(((uint8_t*)(x))[6]) << 8) | \ 48 ((uint64_t)((uint8_t*)(x))[7])) 49 50#define BE_FOURCC( ch0, ch1, ch2, ch3 ) \ 51 ( (uint32_t)(unsigned char)(ch3) | \ 52 ( (uint32_t)(unsigned char)(ch2) << 8 ) | \ 53 ( (uint32_t)(unsigned char)(ch1) << 16 ) | \ 54 ( (uint32_t)(unsigned char)(ch0) << 24 ) ) 55 56#define QT_ATOM BE_FOURCC 57/* top level atoms */ 58#define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e') 59#define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k') 60#define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't') 61#define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v') 62#define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't') 63#define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p') 64#define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e') 65#define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T') 66#define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p') 67#define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd') 68 69#define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v') 70#define STCO_ATOM QT_ATOM('s', 't', 'c', 'o') 71#define CO64_ATOM QT_ATOM('c', 'o', '6', '4') 72 73#define ATOM_PREAMBLE_SIZE 8 74#define COPY_BUFFER_SIZE 1024 75 76int main(int argc, char *argv[]) 77{ 78 FILE *infile; 79 FILE *outfile; 80 unsigned char atom_bytes[ATOM_PREAMBLE_SIZE]; 81 uint32_t atom_type = 0; 82 uint64_t atom_size = 0; 83 uint64_t atom_offset = 0; 84 uint64_t last_offset; 85 unsigned char *moov_atom; 86 unsigned char *ftyp_atom = 0; 87 uint64_t moov_atom_size; 88 uint64_t ftyp_atom_size = 0; 89 uint64_t i, j; 90 uint32_t offset_count; 91 uint64_t current_offset; 92 uint64_t start_offset = 0; 93 unsigned char copy_buffer[COPY_BUFFER_SIZE]; 94 int bytes_to_copy; 95 96 if (argc != 3) { 97 printf ("Usage: qt-faststart <infile.mov> <outfile.mov>\n"); 98 return 0; 99 } 100 101 infile = fopen(argv[1], "rb"); 102 if (!infile) { 103 perror(argv[1]); 104 return 1; 105 } 106 107 /* traverse through the atoms in the file to make sure that 'moov' is 108 * at the end */ 109 while (!feof(infile)) { 110 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 111 break; 112 } 113 atom_size = (uint32_t)BE_32(&atom_bytes[0]); 114 atom_type = BE_32(&atom_bytes[4]); 115 116 /* keep ftyp atom */ 117 if (atom_type == FTYP_ATOM) { 118 ftyp_atom_size = atom_size; 119 free(ftyp_atom); 120 ftyp_atom = malloc(ftyp_atom_size); 121 if (!ftyp_atom) { 122 printf ("could not allocate %"PRIu64" byte for ftyp atom\n", 123 atom_size); 124 fclose(infile); 125 return 1; 126 } 127 fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR); 128 if (fread(ftyp_atom, atom_size, 1, infile) != 1) { 129 perror(argv[1]); 130 free(ftyp_atom); 131 fclose(infile); 132 return 1; 133 } 134 start_offset = ftello(infile); 135 } else { 136 137 /* 64-bit special case */ 138 if (atom_size == 1) { 139 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 140 break; 141 } 142 atom_size = BE_64(&atom_bytes[0]); 143 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR); 144 } else { 145 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR); 146 } 147 } 148 printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n", 149 (atom_type >> 24) & 255, 150 (atom_type >> 16) & 255, 151 (atom_type >> 8) & 255, 152 (atom_type >> 0) & 255, 153 atom_offset, 154 atom_size); 155 if ((atom_type != FREE_ATOM) && 156 (atom_type != JUNK_ATOM) && 157 (atom_type != MDAT_ATOM) && 158 (atom_type != MOOV_ATOM) && 159 (atom_type != PNOT_ATOM) && 160 (atom_type != SKIP_ATOM) && 161 (atom_type != WIDE_ATOM) && 162 (atom_type != PICT_ATOM) && 163 (atom_type != UUID_ATOM) && 164 (atom_type != FTYP_ATOM)) { 165 printf ("encountered non-QT top-level atom (is this a Quicktime file?)\n"); 166 break; 167 } 168 atom_offset += atom_size; 169 } 170 171 if (atom_type != MOOV_ATOM) { 172 printf ("last atom in file was not a moov atom\n"); 173 free(ftyp_atom); 174 fclose(infile); 175 return 0; 176 } 177 178 /* moov atom was, in fact, the last atom in the chunk; load the whole 179 * moov atom */ 180 fseeko(infile, -atom_size, SEEK_END); 181 last_offset = ftello(infile); 182 moov_atom_size = atom_size; 183 moov_atom = malloc(moov_atom_size); 184 if (!moov_atom) { 185 printf ("could not allocate %"PRIu64" byte for moov atom\n", 186 atom_size); 187 free(ftyp_atom); 188 fclose(infile); 189 return 1; 190 } 191 if (fread(moov_atom, atom_size, 1, infile) != 1) { 192 perror(argv[1]); 193 free(moov_atom); 194 free(ftyp_atom); 195 fclose(infile); 196 return 1; 197 } 198 199 /* this utility does not support compressed atoms yet, so disqualify 200 * files with compressed QT atoms */ 201 if (BE_32(&moov_atom[12]) == CMOV_ATOM) { 202 printf ("this utility does not support compressed moov atoms yet\n"); 203 free(moov_atom); 204 free(ftyp_atom); 205 fclose(infile); 206 return 1; 207 } 208 209 /* close; will be re-opened later */ 210 fclose(infile); 211 212 /* crawl through the moov chunk in search of stco or co64 atoms */ 213 for (i = 4; i < moov_atom_size - 4; i++) { 214 atom_type = BE_32(&moov_atom[i]); 215 if (atom_type == STCO_ATOM) { 216 printf (" patching stco atom...\n"); 217 atom_size = BE_32(&moov_atom[i - 4]); 218 if (i + atom_size - 4 > moov_atom_size) { 219 printf (" bad atom size\n"); 220 free(moov_atom); 221 free(ftyp_atom); 222 return 1; 223 } 224 offset_count = BE_32(&moov_atom[i + 8]); 225 for (j = 0; j < offset_count; j++) { 226 current_offset = BE_32(&moov_atom[i + 12 + j * 4]); 227 current_offset += moov_atom_size; 228 moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF; 229 moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF; 230 moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF; 231 moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF; 232 } 233 i += atom_size - 4; 234 } else if (atom_type == CO64_ATOM) { 235 printf (" patching co64 atom...\n"); 236 atom_size = BE_32(&moov_atom[i - 4]); 237 if (i + atom_size - 4 > moov_atom_size) { 238 printf (" bad atom size\n"); 239 free(moov_atom); 240 free(ftyp_atom); 241 return 1; 242 } 243 offset_count = BE_32(&moov_atom[i + 8]); 244 for (j = 0; j < offset_count; j++) { 245 current_offset = BE_64(&moov_atom[i + 12 + j * 8]); 246 current_offset += moov_atom_size; 247 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF; 248 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF; 249 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF; 250 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF; 251 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF; 252 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF; 253 moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF; 254 moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF; 255 } 256 i += atom_size - 4; 257 } 258 } 259 260 /* re-open the input file and open the output file */ 261 infile = fopen(argv[1], "rb"); 262 if (!infile) { 263 perror(argv[1]); 264 free(moov_atom); 265 free(ftyp_atom); 266 return 1; 267 } 268 269 if (start_offset > 0) { /* seek after ftyp atom */ 270 fseeko(infile, start_offset, SEEK_SET); 271 last_offset -= start_offset; 272 } 273 274 outfile = fopen(argv[2], "wb"); 275 if (!outfile) { 276 perror(argv[2]); 277 fclose(outfile); 278 free(moov_atom); 279 free(ftyp_atom); 280 return 1; 281 } 282 283 /* dump the same ftyp atom */ 284 if (ftyp_atom_size > 0) { 285 printf (" writing ftyp atom...\n"); 286 if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) { 287 perror(argv[2]); 288 goto error_out; 289 } 290 } 291 292 /* dump the new moov atom */ 293 printf (" writing moov atom...\n"); 294 if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) { 295 perror(argv[2]); 296 goto error_out; 297 } 298 299 /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */ 300 printf (" copying rest of file...\n"); 301 while (last_offset) { 302 if (last_offset > COPY_BUFFER_SIZE) 303 bytes_to_copy = COPY_BUFFER_SIZE; 304 else 305 bytes_to_copy = last_offset; 306 307 if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) { 308 perror(argv[1]); 309 goto error_out; 310 } 311 if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) { 312 perror(argv[2]); 313 goto error_out; 314 } 315 316 last_offset -= bytes_to_copy; 317 } 318 319 fclose(infile); 320 fclose(outfile); 321 free(moov_atom); 322 free(ftyp_atom); 323 324 return 0; 325 326error_out: 327 fclose(infile); 328 fclose(outfile); 329 free(moov_atom); 330 free(ftyp_atom); 331 return 1; 332} 333