Libav 0.7.1
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00001 /* 00002 * qt-faststart.c, v0.2 00003 * by Mike Melanson (melanson@pcisys.net) 00004 * This file is placed in the public domain. Use the program however you 00005 * see fit. 00006 * 00007 * This utility rearranges a Quicktime file such that the moov atom 00008 * is in front of the data, thus facilitating network streaming. 00009 * 00010 * To compile this program, start from the base directory from which you 00011 * are building Libav and type: 00012 * make tools/qt-faststart 00013 * The qt-faststart program will be built in the tools/ directory. If you 00014 * do not build the program in this manner, correct results are not 00015 * guaranteed, particularly on 64-bit platforms. 00016 * Invoke the program with: 00017 * qt-faststart <infile.mov> <outfile.mov> 00018 * 00019 * Notes: Quicktime files can come in many configurations of top-level 00020 * atoms. This utility stipulates that the very last atom in the file needs 00021 * to be a moov atom. When given such a file, this utility will rearrange 00022 * the top-level atoms by shifting the moov atom from the back of the file 00023 * to the front, and patch the chunk offsets along the way. This utility 00024 * presently only operates on uncompressed moov atoms. 00025 */ 00026 00027 #include <stdio.h> 00028 #include <stdlib.h> 00029 #include <inttypes.h> 00030 #include <string.h> 00031 00032 #ifdef __MINGW32__ 00033 #define fseeko(x,y,z) fseeko64(x,y,z) 00034 #define ftello(x) ftello64(x) 00035 #endif 00036 00037 #define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) 00038 #define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \ 00039 (((uint8_t*)(x))[1] << 16) | \ 00040 (((uint8_t*)(x))[2] << 8) | \ 00041 ((uint8_t*)(x))[3]) 00042 #define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) | \ 00043 ((uint64_t)(((uint8_t*)(x))[1]) << 48) | \ 00044 ((uint64_t)(((uint8_t*)(x))[2]) << 40) | \ 00045 ((uint64_t)(((uint8_t*)(x))[3]) << 32) | \ 00046 ((uint64_t)(((uint8_t*)(x))[4]) << 24) | \ 00047 ((uint64_t)(((uint8_t*)(x))[5]) << 16) | \ 00048 ((uint64_t)(((uint8_t*)(x))[6]) << 8) | \ 00049 ((uint64_t)((uint8_t*)(x))[7])) 00050 00051 #define BE_FOURCC( ch0, ch1, ch2, ch3 ) \ 00052 ( (uint32_t)(unsigned char)(ch3) | \ 00053 ( (uint32_t)(unsigned char)(ch2) << 8 ) | \ 00054 ( (uint32_t)(unsigned char)(ch1) << 16 ) | \ 00055 ( (uint32_t)(unsigned char)(ch0) << 24 ) ) 00056 00057 #define QT_ATOM BE_FOURCC 00058 /* top level atoms */ 00059 #define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e') 00060 #define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k') 00061 #define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't') 00062 #define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v') 00063 #define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't') 00064 #define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p') 00065 #define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e') 00066 #define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T') 00067 #define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p') 00068 #define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd') 00069 00070 #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v') 00071 #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o') 00072 #define CO64_ATOM QT_ATOM('c', 'o', '6', '4') 00073 00074 #define ATOM_PREAMBLE_SIZE 8 00075 #define COPY_BUFFER_SIZE 1024 00076 00077 int main(int argc, char *argv[]) 00078 { 00079 FILE *infile = NULL; 00080 FILE *outfile = NULL; 00081 unsigned char atom_bytes[ATOM_PREAMBLE_SIZE]; 00082 uint32_t atom_type = 0; 00083 uint64_t atom_size = 0; 00084 uint64_t atom_offset = 0; 00085 uint64_t last_offset; 00086 unsigned char *moov_atom = NULL; 00087 unsigned char *ftyp_atom = NULL; 00088 uint64_t moov_atom_size; 00089 uint64_t ftyp_atom_size = 0; 00090 uint64_t i, j; 00091 uint32_t offset_count; 00092 uint64_t current_offset; 00093 uint64_t start_offset = 0; 00094 unsigned char copy_buffer[COPY_BUFFER_SIZE]; 00095 int bytes_to_copy; 00096 00097 if (argc != 3) { 00098 printf ("Usage: qt-faststart <infile.mov> <outfile.mov>\n"); 00099 return 0; 00100 } 00101 00102 if (!strcmp(argv[1], argv[2])) { 00103 fprintf(stderr, "input and output files need to be different\n"); 00104 return 1; 00105 } 00106 00107 infile = fopen(argv[1], "rb"); 00108 if (!infile) { 00109 perror(argv[1]); 00110 goto error_out; 00111 } 00112 00113 /* traverse through the atoms in the file to make sure that 'moov' is 00114 * at the end */ 00115 while (!feof(infile)) { 00116 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 00117 break; 00118 } 00119 atom_size = (uint32_t)BE_32(&atom_bytes[0]); 00120 atom_type = BE_32(&atom_bytes[4]); 00121 00122 /* keep ftyp atom */ 00123 if (atom_type == FTYP_ATOM) { 00124 ftyp_atom_size = atom_size; 00125 free(ftyp_atom); 00126 ftyp_atom = malloc(ftyp_atom_size); 00127 if (!ftyp_atom) { 00128 printf ("could not allocate %"PRIu64" byte for ftyp atom\n", 00129 atom_size); 00130 goto error_out; 00131 } 00132 fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR); 00133 if (fread(ftyp_atom, atom_size, 1, infile) != 1) { 00134 perror(argv[1]); 00135 goto error_out; 00136 } 00137 start_offset = ftello(infile); 00138 } else { 00139 00140 /* 64-bit special case */ 00141 if (atom_size == 1) { 00142 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 00143 break; 00144 } 00145 atom_size = BE_64(&atom_bytes[0]); 00146 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR); 00147 } else { 00148 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR); 00149 } 00150 } 00151 printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n", 00152 (atom_type >> 24) & 255, 00153 (atom_type >> 16) & 255, 00154 (atom_type >> 8) & 255, 00155 (atom_type >> 0) & 255, 00156 atom_offset, 00157 atom_size); 00158 if ((atom_type != FREE_ATOM) && 00159 (atom_type != JUNK_ATOM) && 00160 (atom_type != MDAT_ATOM) && 00161 (atom_type != MOOV_ATOM) && 00162 (atom_type != PNOT_ATOM) && 00163 (atom_type != SKIP_ATOM) && 00164 (atom_type != WIDE_ATOM) && 00165 (atom_type != PICT_ATOM) && 00166 (atom_type != UUID_ATOM) && 00167 (atom_type != FTYP_ATOM)) { 00168 printf ("encountered non-QT top-level atom (is this a Quicktime file?)\n"); 00169 break; 00170 } 00171 atom_offset += atom_size; 00172 00173 /* The atom header is 8 (or 16 bytes), if the atom size (which 00174 * includes these 8 or 16 bytes) is less than that, we won't be 00175 * able to continue scanning sensibly after this atom, so break. */ 00176 if (atom_size < 8) 00177 break; 00178 } 00179 00180 if (atom_type != MOOV_ATOM) { 00181 printf ("last atom in file was not a moov atom\n"); 00182 free(ftyp_atom); 00183 fclose(infile); 00184 return 0; 00185 } 00186 00187 /* moov atom was, in fact, the last atom in the chunk; load the whole 00188 * moov atom */ 00189 fseeko(infile, -atom_size, SEEK_END); 00190 last_offset = ftello(infile); 00191 moov_atom_size = atom_size; 00192 moov_atom = malloc(moov_atom_size); 00193 if (!moov_atom) { 00194 printf ("could not allocate %"PRIu64" byte for moov atom\n", 00195 atom_size); 00196 goto error_out; 00197 } 00198 if (fread(moov_atom, atom_size, 1, infile) != 1) { 00199 perror(argv[1]); 00200 goto error_out; 00201 } 00202 00203 /* this utility does not support compressed atoms yet, so disqualify 00204 * files with compressed QT atoms */ 00205 if (BE_32(&moov_atom[12]) == CMOV_ATOM) { 00206 printf ("this utility does not support compressed moov atoms yet\n"); 00207 goto error_out; 00208 } 00209 00210 /* close; will be re-opened later */ 00211 fclose(infile); 00212 infile = NULL; 00213 00214 /* crawl through the moov chunk in search of stco or co64 atoms */ 00215 for (i = 4; i < moov_atom_size - 4; i++) { 00216 atom_type = BE_32(&moov_atom[i]); 00217 if (atom_type == STCO_ATOM) { 00218 printf (" patching stco atom...\n"); 00219 atom_size = BE_32(&moov_atom[i - 4]); 00220 if (i + atom_size - 4 > moov_atom_size) { 00221 printf (" bad atom size\n"); 00222 goto error_out; 00223 } 00224 offset_count = BE_32(&moov_atom[i + 8]); 00225 for (j = 0; j < offset_count; j++) { 00226 current_offset = BE_32(&moov_atom[i + 12 + j * 4]); 00227 current_offset += moov_atom_size; 00228 moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF; 00229 moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF; 00230 moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF; 00231 moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF; 00232 } 00233 i += atom_size - 4; 00234 } else if (atom_type == CO64_ATOM) { 00235 printf (" patching co64 atom...\n"); 00236 atom_size = BE_32(&moov_atom[i - 4]); 00237 if (i + atom_size - 4 > moov_atom_size) { 00238 printf (" bad atom size\n"); 00239 goto error_out; 00240 } 00241 offset_count = BE_32(&moov_atom[i + 8]); 00242 for (j = 0; j < offset_count; j++) { 00243 current_offset = BE_64(&moov_atom[i + 12 + j * 8]); 00244 current_offset += moov_atom_size; 00245 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF; 00246 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF; 00247 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF; 00248 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF; 00249 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF; 00250 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF; 00251 moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF; 00252 moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF; 00253 } 00254 i += atom_size - 4; 00255 } 00256 } 00257 00258 /* re-open the input file and open the output file */ 00259 infile = fopen(argv[1], "rb"); 00260 if (!infile) { 00261 perror(argv[1]); 00262 goto error_out; 00263 } 00264 00265 if (start_offset > 0) { /* seek after ftyp atom */ 00266 fseeko(infile, start_offset, SEEK_SET); 00267 last_offset -= start_offset; 00268 } 00269 00270 outfile = fopen(argv[2], "wb"); 00271 if (!outfile) { 00272 perror(argv[2]); 00273 goto error_out; 00274 } 00275 00276 /* dump the same ftyp atom */ 00277 if (ftyp_atom_size > 0) { 00278 printf (" writing ftyp atom...\n"); 00279 if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) { 00280 perror(argv[2]); 00281 goto error_out; 00282 } 00283 } 00284 00285 /* dump the new moov atom */ 00286 printf (" writing moov atom...\n"); 00287 if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) { 00288 perror(argv[2]); 00289 goto error_out; 00290 } 00291 00292 /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */ 00293 printf (" copying rest of file...\n"); 00294 while (last_offset) { 00295 if (last_offset > COPY_BUFFER_SIZE) 00296 bytes_to_copy = COPY_BUFFER_SIZE; 00297 else 00298 bytes_to_copy = last_offset; 00299 00300 if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) { 00301 perror(argv[1]); 00302 goto error_out; 00303 } 00304 if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) { 00305 perror(argv[2]); 00306 goto error_out; 00307 } 00308 00309 last_offset -= bytes_to_copy; 00310 } 00311 00312 fclose(infile); 00313 fclose(outfile); 00314 free(moov_atom); 00315 free(ftyp_atom); 00316 00317 return 0; 00318 00319 error_out: 00320 if (infile) 00321 fclose(infile); 00322 if (outfile) 00323 fclose(outfile); 00324 free(moov_atom); 00325 free(ftyp_atom); 00326 return 1; 00327 }