Libav
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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 FFmpeg 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 00031 #ifdef __MINGW32__ 00032 #define fseeko(x,y,z) fseeko64(x,y,z) 00033 #define ftello(x) ftello64(x) 00034 #endif 00035 00036 #define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) 00037 #define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \ 00038 (((uint8_t*)(x))[1] << 16) | \ 00039 (((uint8_t*)(x))[2] << 8) | \ 00040 ((uint8_t*)(x))[3]) 00041 #define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) | \ 00042 ((uint64_t)(((uint8_t*)(x))[1]) << 48) | \ 00043 ((uint64_t)(((uint8_t*)(x))[2]) << 40) | \ 00044 ((uint64_t)(((uint8_t*)(x))[3]) << 32) | \ 00045 ((uint64_t)(((uint8_t*)(x))[4]) << 24) | \ 00046 ((uint64_t)(((uint8_t*)(x))[5]) << 16) | \ 00047 ((uint64_t)(((uint8_t*)(x))[6]) << 8) | \ 00048 ((uint64_t)((uint8_t*)(x))[7])) 00049 00050 #define BE_FOURCC( ch0, ch1, ch2, ch3 ) \ 00051 ( (uint32_t)(unsigned char)(ch3) | \ 00052 ( (uint32_t)(unsigned char)(ch2) << 8 ) | \ 00053 ( (uint32_t)(unsigned char)(ch1) << 16 ) | \ 00054 ( (uint32_t)(unsigned char)(ch0) << 24 ) ) 00055 00056 #define QT_ATOM BE_FOURCC 00057 /* top level atoms */ 00058 #define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e') 00059 #define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k') 00060 #define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't') 00061 #define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v') 00062 #define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't') 00063 #define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p') 00064 #define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e') 00065 #define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T') 00066 #define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p') 00067 #define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd') 00068 00069 #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v') 00070 #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o') 00071 #define CO64_ATOM QT_ATOM('c', 'o', '6', '4') 00072 00073 #define ATOM_PREAMBLE_SIZE 8 00074 #define COPY_BUFFER_SIZE 1024 00075 00076 int main(int argc, char *argv[]) 00077 { 00078 FILE *infile; 00079 FILE *outfile; 00080 unsigned char atom_bytes[ATOM_PREAMBLE_SIZE]; 00081 uint32_t atom_type = 0; 00082 uint64_t atom_size = 0; 00083 uint64_t atom_offset = 0; 00084 uint64_t last_offset; 00085 unsigned char *moov_atom; 00086 unsigned char *ftyp_atom = 0; 00087 uint64_t moov_atom_size; 00088 uint64_t ftyp_atom_size = 0; 00089 uint64_t i, j; 00090 uint32_t offset_count; 00091 uint64_t current_offset; 00092 uint64_t start_offset = 0; 00093 unsigned char copy_buffer[COPY_BUFFER_SIZE]; 00094 int bytes_to_copy; 00095 00096 if (argc != 3) { 00097 printf ("Usage: qt-faststart <infile.mov> <outfile.mov>\n"); 00098 return 0; 00099 } 00100 00101 infile = fopen(argv[1], "rb"); 00102 if (!infile) { 00103 perror(argv[1]); 00104 return 1; 00105 } 00106 00107 /* traverse through the atoms in the file to make sure that 'moov' is 00108 * at the end */ 00109 while (!feof(infile)) { 00110 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 00111 break; 00112 } 00113 atom_size = (uint32_t)BE_32(&atom_bytes[0]); 00114 atom_type = BE_32(&atom_bytes[4]); 00115 00116 /* keep ftyp atom */ 00117 if (atom_type == FTYP_ATOM) { 00118 ftyp_atom_size = atom_size; 00119 free(ftyp_atom); 00120 ftyp_atom = malloc(ftyp_atom_size); 00121 if (!ftyp_atom) { 00122 printf ("could not allocate %"PRIu64" byte for ftyp atom\n", 00123 atom_size); 00124 fclose(infile); 00125 return 1; 00126 } 00127 fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR); 00128 if (fread(ftyp_atom, atom_size, 1, infile) != 1) { 00129 perror(argv[1]); 00130 free(ftyp_atom); 00131 fclose(infile); 00132 return 1; 00133 } 00134 start_offset = ftello(infile); 00135 } else { 00136 00137 /* 64-bit special case */ 00138 if (atom_size == 1) { 00139 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { 00140 break; 00141 } 00142 atom_size = BE_64(&atom_bytes[0]); 00143 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR); 00144 } else { 00145 fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR); 00146 } 00147 } 00148 printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n", 00149 (atom_type >> 24) & 255, 00150 (atom_type >> 16) & 255, 00151 (atom_type >> 8) & 255, 00152 (atom_type >> 0) & 255, 00153 atom_offset, 00154 atom_size); 00155 if ((atom_type != FREE_ATOM) && 00156 (atom_type != JUNK_ATOM) && 00157 (atom_type != MDAT_ATOM) && 00158 (atom_type != MOOV_ATOM) && 00159 (atom_type != PNOT_ATOM) && 00160 (atom_type != SKIP_ATOM) && 00161 (atom_type != WIDE_ATOM) && 00162 (atom_type != PICT_ATOM) && 00163 (atom_type != UUID_ATOM) && 00164 (atom_type != FTYP_ATOM)) { 00165 printf ("encountered non-QT top-level atom (is this a Quicktime file?)\n"); 00166 break; 00167 } 00168 atom_offset += atom_size; 00169 } 00170 00171 if (atom_type != MOOV_ATOM) { 00172 printf ("last atom in file was not a moov atom\n"); 00173 free(ftyp_atom); 00174 fclose(infile); 00175 return 0; 00176 } 00177 00178 /* moov atom was, in fact, the last atom in the chunk; load the whole 00179 * moov atom */ 00180 fseeko(infile, -atom_size, SEEK_END); 00181 last_offset = ftello(infile); 00182 moov_atom_size = atom_size; 00183 moov_atom = malloc(moov_atom_size); 00184 if (!moov_atom) { 00185 printf ("could not allocate %"PRIu64" byte for moov atom\n", 00186 atom_size); 00187 free(ftyp_atom); 00188 fclose(infile); 00189 return 1; 00190 } 00191 if (fread(moov_atom, atom_size, 1, infile) != 1) { 00192 perror(argv[1]); 00193 free(moov_atom); 00194 free(ftyp_atom); 00195 fclose(infile); 00196 return 1; 00197 } 00198 00199 /* this utility does not support compressed atoms yet, so disqualify 00200 * files with compressed QT atoms */ 00201 if (BE_32(&moov_atom[12]) == CMOV_ATOM) { 00202 printf ("this utility does not support compressed moov atoms yet\n"); 00203 free(moov_atom); 00204 free(ftyp_atom); 00205 fclose(infile); 00206 return 1; 00207 } 00208 00209 /* close; will be re-opened later */ 00210 fclose(infile); 00211 00212 /* crawl through the moov chunk in search of stco or co64 atoms */ 00213 for (i = 4; i < moov_atom_size - 4; i++) { 00214 atom_type = BE_32(&moov_atom[i]); 00215 if (atom_type == STCO_ATOM) { 00216 printf (" patching stco atom...\n"); 00217 atom_size = BE_32(&moov_atom[i - 4]); 00218 if (i + atom_size - 4 > moov_atom_size) { 00219 printf (" bad atom size\n"); 00220 free(moov_atom); 00221 free(ftyp_atom); 00222 return 1; 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 free(moov_atom); 00240 free(ftyp_atom); 00241 return 1; 00242 } 00243 offset_count = BE_32(&moov_atom[i + 8]); 00244 for (j = 0; j < offset_count; j++) { 00245 current_offset = BE_64(&moov_atom[i + 12 + j * 8]); 00246 current_offset += moov_atom_size; 00247 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF; 00248 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF; 00249 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF; 00250 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF; 00251 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF; 00252 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF; 00253 moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF; 00254 moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF; 00255 } 00256 i += atom_size - 4; 00257 } 00258 } 00259 00260 /* re-open the input file and open the output file */ 00261 infile = fopen(argv[1], "rb"); 00262 if (!infile) { 00263 perror(argv[1]); 00264 free(moov_atom); 00265 free(ftyp_atom); 00266 return 1; 00267 } 00268 00269 if (start_offset > 0) { /* seek after ftyp atom */ 00270 fseeko(infile, start_offset, SEEK_SET); 00271 last_offset -= start_offset; 00272 } 00273 00274 outfile = fopen(argv[2], "wb"); 00275 if (!outfile) { 00276 perror(argv[2]); 00277 fclose(outfile); 00278 free(moov_atom); 00279 free(ftyp_atom); 00280 return 1; 00281 } 00282 00283 /* dump the same ftyp atom */ 00284 if (ftyp_atom_size > 0) { 00285 printf (" writing ftyp atom...\n"); 00286 if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) { 00287 perror(argv[2]); 00288 goto error_out; 00289 } 00290 } 00291 00292 /* dump the new moov atom */ 00293 printf (" writing moov atom...\n"); 00294 if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) { 00295 perror(argv[2]); 00296 goto error_out; 00297 } 00298 00299 /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */ 00300 printf (" copying rest of file...\n"); 00301 while (last_offset) { 00302 if (last_offset > COPY_BUFFER_SIZE) 00303 bytes_to_copy = COPY_BUFFER_SIZE; 00304 else 00305 bytes_to_copy = last_offset; 00306 00307 if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) { 00308 perror(argv[1]); 00309 goto error_out; 00310 } 00311 if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) { 00312 perror(argv[2]); 00313 goto error_out; 00314 } 00315 00316 last_offset -= bytes_to_copy; 00317 } 00318 00319 fclose(infile); 00320 fclose(outfile); 00321 free(moov_atom); 00322 free(ftyp_atom); 00323 00324 return 0; 00325 00326 error_out: 00327 fclose(infile); 00328 fclose(outfile); 00329 free(moov_atom); 00330 free(ftyp_atom); 00331 return 1; 00332 }