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tools/qt-faststart.c

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00001 /*
00002  * qt-faststart.c, v0.1
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 
00068 #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v')
00069 #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o')
00070 #define CO64_ATOM QT_ATOM('c', 'o', '6', '4')
00071 
00072 #define ATOM_PREAMBLE_SIZE 8
00073 #define COPY_BUFFER_SIZE 1024
00074 
00075 int main(int argc, char *argv[])
00076 {
00077     FILE *infile;
00078     FILE *outfile;
00079     unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
00080     uint32_t atom_type = 0;
00081     uint64_t atom_size = 0;
00082     uint64_t last_offset;
00083     unsigned char *moov_atom;
00084     unsigned char *ftyp_atom = 0;
00085     uint64_t moov_atom_size;
00086     uint64_t ftyp_atom_size = 0;
00087     uint64_t i, j;
00088     uint32_t offset_count;
00089     uint64_t current_offset;
00090     uint64_t start_offset = 0;
00091     unsigned char copy_buffer[COPY_BUFFER_SIZE];
00092     int bytes_to_copy;
00093 
00094     if (argc != 3) {
00095         printf ("Usage: qt-faststart <infile.mov> <outfile.mov>\n");
00096         return 0;
00097     }
00098 
00099     infile = fopen(argv[1], "rb");
00100     if (!infile) {
00101         perror(argv[1]);
00102         return 1;
00103     }
00104 
00105     /* traverse through the atoms in the file to make sure that 'moov' is
00106      * at the end */
00107     while (!feof(infile)) {
00108         if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
00109             break;
00110         }
00111         atom_size = (uint32_t)BE_32(&atom_bytes[0]);
00112         atom_type = BE_32(&atom_bytes[4]);
00113 
00114         if ((atom_type != FREE_ATOM) &&
00115             (atom_type != JUNK_ATOM) &&
00116             (atom_type != MDAT_ATOM) &&
00117             (atom_type != MOOV_ATOM) &&
00118             (atom_type != PNOT_ATOM) &&
00119             (atom_type != SKIP_ATOM) &&
00120             (atom_type != WIDE_ATOM) &&
00121             (atom_type != PICT_ATOM) &&
00122             (atom_type != FTYP_ATOM)) {
00123             printf ("encountered non-QT top-level atom (is this a Quicktime file?)\n");
00124             break;
00125         }
00126 
00127         /* keep ftyp atom */
00128         if (atom_type == FTYP_ATOM) {
00129             ftyp_atom_size = atom_size;
00130             ftyp_atom = malloc(ftyp_atom_size);
00131             if (!ftyp_atom) {
00132                 printf ("could not allocate 0x%llX byte for ftyp atom\n",
00133                         atom_size);
00134                 fclose(infile);
00135                 return 1;
00136             }
00137             fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR);
00138             if (fread(ftyp_atom, atom_size, 1, infile) != 1) {
00139                 perror(argv[1]);
00140                 free(ftyp_atom);
00141                 fclose(infile);
00142                 return 1;
00143             }
00144             start_offset = ftello(infile);
00145             continue;
00146         }
00147 
00148         /* 64-bit special case */
00149         if (atom_size == 1) {
00150             if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
00151                 break;
00152             }
00153             atom_size = BE_64(&atom_bytes[0]);
00154             fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
00155         } else {
00156             fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
00157         }
00158     }
00159 
00160     if (atom_type != MOOV_ATOM) {
00161         printf ("last atom in file was not a moov atom\n");
00162         fclose(infile);
00163         return 0;
00164     }
00165 
00166     /* moov atom was, in fact, the last atom in the chunk; load the whole
00167      * moov atom */
00168     fseeko(infile, -atom_size, SEEK_END);
00169     last_offset = ftello(infile);
00170     moov_atom_size = atom_size;
00171     moov_atom = malloc(moov_atom_size);
00172     if (!moov_atom) {
00173         printf ("could not allocate 0x%llX byte for moov atom\n",
00174             atom_size);
00175         fclose(infile);
00176         return 1;
00177     }
00178     if (fread(moov_atom, atom_size, 1, infile) != 1) {
00179         perror(argv[1]);
00180         free(moov_atom);
00181         fclose(infile);
00182         return 1;
00183     }
00184 
00185     /* this utility does not support compressed atoms yet, so disqualify
00186      * files with compressed QT atoms */
00187     if (BE_32(&moov_atom[12]) == CMOV_ATOM) {
00188         printf ("this utility does not support compressed moov atoms yet\n");
00189         free(moov_atom);
00190         fclose(infile);
00191         return 1;
00192     }
00193 
00194     /* close; will be re-opened later */
00195     fclose(infile);
00196 
00197     /* crawl through the moov chunk in search of stco or co64 atoms */
00198     for (i = 4; i < moov_atom_size - 4; i++) {
00199         atom_type = BE_32(&moov_atom[i]);
00200         if (atom_type == STCO_ATOM) {
00201             printf (" patching stco atom...\n");
00202             atom_size = BE_32(&moov_atom[i - 4]);
00203             if (i + atom_size - 4 > moov_atom_size) {
00204                 printf (" bad atom size\n");
00205                 free(moov_atom);
00206                 return 1;
00207             }
00208             offset_count = BE_32(&moov_atom[i + 8]);
00209             for (j = 0; j < offset_count; j++) {
00210                 current_offset = BE_32(&moov_atom[i + 12 + j * 4]);
00211                 current_offset += moov_atom_size;
00212                 moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF;
00213                 moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF;
00214                 moov_atom[i + 12 + j * 4 + 2] = (current_offset >>  8) & 0xFF;
00215                 moov_atom[i + 12 + j * 4 + 3] = (current_offset >>  0) & 0xFF;
00216             }
00217             i += atom_size - 4;
00218         } else if (atom_type == CO64_ATOM) {
00219             printf (" patching co64 atom...\n");
00220             atom_size = BE_32(&moov_atom[i - 4]);
00221             if (i + atom_size - 4 > moov_atom_size) {
00222                 printf (" bad atom size\n");
00223                 free(moov_atom);
00224                 return 1;
00225             }
00226             offset_count = BE_32(&moov_atom[i + 8]);
00227             for (j = 0; j < offset_count; j++) {
00228                 current_offset = BE_64(&moov_atom[i + 12 + j * 8]);
00229                 current_offset += moov_atom_size;
00230                 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF;
00231                 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF;
00232                 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF;
00233                 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF;
00234                 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF;
00235                 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF;
00236                 moov_atom[i + 12 + j * 8 + 6] = (current_offset >>  8) & 0xFF;
00237                 moov_atom[i + 12 + j * 8 + 7] = (current_offset >>  0) & 0xFF;
00238             }
00239             i += atom_size - 4;
00240         }
00241     }
00242 
00243     /* re-open the input file and open the output file */
00244     infile = fopen(argv[1], "rb");
00245     if (!infile) {
00246         perror(argv[1]);
00247         free(moov_atom);
00248         return 1;
00249     }
00250 
00251     if (start_offset > 0) { /* seek after ftyp atom */
00252         fseeko(infile, start_offset, SEEK_SET);
00253         last_offset -= start_offset;
00254     }
00255 
00256     outfile = fopen(argv[2], "wb");
00257     if (!outfile) {
00258         perror(argv[2]);
00259         fclose(outfile);
00260         free(moov_atom);
00261         return 1;
00262     }
00263 
00264     /* dump the same ftyp atom */
00265     if (ftyp_atom_size > 0) {
00266         printf (" writing ftyp atom...\n");
00267         if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) {
00268             perror(argv[2]);
00269             goto error_out;
00270         }
00271     }
00272 
00273     /* dump the new moov atom */
00274     printf (" writing moov atom...\n");
00275     if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) {
00276         perror(argv[2]);
00277         goto error_out;
00278     }
00279 
00280     /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */
00281     printf (" copying rest of file...\n");
00282     while (last_offset) {
00283         if (last_offset > COPY_BUFFER_SIZE)
00284             bytes_to_copy = COPY_BUFFER_SIZE;
00285         else
00286             bytes_to_copy = last_offset;
00287 
00288         if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) {
00289             perror(argv[1]);
00290             goto error_out;
00291         }
00292         if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) {
00293             perror(argv[2]);
00294             goto error_out;
00295         }
00296 
00297         last_offset -= bytes_to_copy;
00298     }
00299 
00300     fclose(infile);
00301     fclose(outfile);
00302     free(moov_atom);
00303     if (ftyp_atom_size > 0)
00304         free(ftyp_atom);
00305 
00306     return 0;
00307 
00308 error_out:
00309     fclose(infile);
00310     fclose(outfile);
00311     free(moov_atom);
00312     if (ftyp_atom_size > 0)
00313         free(ftyp_atom);
00314     return 1;
00315 }

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