Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  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. #define fseeko(x, y, z) fseeko64(x, y, z)
  34. #define ftello(x)       ftello64(x)
  35. #elif defined(_WIN32)
  36. #define fseeko(x, y, z) _fseeki64(x, y, z)
  37. #define ftello(x)       _ftelli64(x)
  38. #endif
  39.  
  40. #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
  41.  
  42. #define BE_16(x) ((((uint8_t*)(x))[0] <<  8) | ((uint8_t*)(x))[1])
  43.  
  44. #define BE_32(x) ((((uint8_t*)(x))[0] << 24) |  \
  45.                   (((uint8_t*)(x))[1] << 16) |  \
  46.                   (((uint8_t*)(x))[2] <<  8) |  \
  47.                    ((uint8_t*)(x))[3])
  48.  
  49. #define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) |  \
  50.                   ((uint64_t)(((uint8_t*)(x))[1]) << 48) |  \
  51.                   ((uint64_t)(((uint8_t*)(x))[2]) << 40) |  \
  52.                   ((uint64_t)(((uint8_t*)(x))[3]) << 32) |  \
  53.                   ((uint64_t)(((uint8_t*)(x))[4]) << 24) |  \
  54.                   ((uint64_t)(((uint8_t*)(x))[5]) << 16) |  \
  55.                   ((uint64_t)(((uint8_t*)(x))[6]) <<  8) |  \
  56.                   ((uint64_t)( (uint8_t*)(x))[7]))
  57.  
  58. #define BE_FOURCC(ch0, ch1, ch2, ch3)           \
  59.     ( (uint32_t)(unsigned char)(ch3)        |   \
  60.      ((uint32_t)(unsigned char)(ch2) <<  8) |   \
  61.      ((uint32_t)(unsigned char)(ch1) << 16) |   \
  62.      ((uint32_t)(unsigned char)(ch0) << 24) )
  63.  
  64. #define QT_ATOM BE_FOURCC
  65. /* top level atoms */
  66. #define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e')
  67. #define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k')
  68. #define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't')
  69. #define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v')
  70. #define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't')
  71. #define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p')
  72. #define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e')
  73. #define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T')
  74. #define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p')
  75. #define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd')
  76.  
  77. #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v')
  78. #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o')
  79. #define CO64_ATOM QT_ATOM('c', 'o', '6', '4')
  80.  
  81. #define ATOM_PREAMBLE_SIZE    8
  82. #define COPY_BUFFER_SIZE   33554432
  83.  
  84. int main(int argc, char *argv[])
  85. {
  86.     FILE *infile  = NULL;
  87.     FILE *outfile = NULL;
  88.     unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
  89.     uint32_t atom_type   = 0;
  90.     uint64_t atom_size   = 0;
  91.     uint64_t atom_offset = 0;
  92.     uint64_t last_offset;
  93.     unsigned char *moov_atom = NULL;
  94.     unsigned char *ftyp_atom = NULL;
  95.     uint64_t moov_atom_size;
  96.     uint64_t ftyp_atom_size = 0;
  97.     uint64_t i, j;
  98.     uint32_t offset_count;
  99.     uint64_t current_offset;
  100.     int64_t start_offset = 0;
  101.     unsigned char *copy_buffer = NULL;
  102.     int bytes_to_copy;
  103.  
  104.     if (argc != 3) {
  105.         printf("Usage: qt-faststart <infile.mov> <outfile.mov>\n");
  106.         return 0;
  107.     }
  108.  
  109.     if (!strcmp(argv[1], argv[2])) {
  110.         fprintf(stderr, "input and output files need to be different\n");
  111.         return 1;
  112.     }
  113.  
  114.     infile = fopen(argv[1], "rb");
  115.     if (!infile) {
  116.         perror(argv[1]);
  117.         goto error_out;
  118.     }
  119.  
  120.     /* traverse through the atoms in the file to make sure that 'moov' is
  121.      * at the end */
  122.     while (!feof(infile)) {
  123.         if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
  124.             break;
  125.         }
  126.         atom_size = (uint32_t) BE_32(&atom_bytes[0]);
  127.         atom_type = BE_32(&atom_bytes[4]);
  128.  
  129.         /* keep ftyp atom */
  130.         if (atom_type == FTYP_ATOM) {
  131.             ftyp_atom_size = atom_size;
  132.             free(ftyp_atom);
  133.             ftyp_atom = malloc(ftyp_atom_size);
  134.             if (!ftyp_atom) {
  135.                 printf("could not allocate %"PRIu64" bytes for ftyp atom\n",
  136.                        atom_size);
  137.                 goto error_out;
  138.             }
  139.             if (   fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR)
  140.                 || fread(ftyp_atom, atom_size, 1, infile) != 1
  141.                 || (start_offset = ftello(infile))<0) {
  142.                 perror(argv[1]);
  143.                 goto error_out;
  144.             }
  145.         } else {
  146.             int ret;
  147.             /* 64-bit special case */
  148.             if (atom_size == 1) {
  149.                 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
  150.                     break;
  151.                 }
  152.                 atom_size = BE_64(&atom_bytes[0]);
  153.                 ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
  154.             } else {
  155.                 ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
  156.             }
  157.             if(ret) {
  158.                 perror(argv[1]);
  159.                 goto error_out;
  160.             }
  161.         }
  162.         printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n",
  163.                (atom_type >> 24) & 255,
  164.                (atom_type >> 16) & 255,
  165.                (atom_type >>  8) & 255,
  166.                (atom_type >>  0) & 255,
  167.                atom_offset,
  168.                atom_size);
  169.         if ((atom_type != FREE_ATOM) &&
  170.             (atom_type != JUNK_ATOM) &&
  171.             (atom_type != MDAT_ATOM) &&
  172.             (atom_type != MOOV_ATOM) &&
  173.             (atom_type != PNOT_ATOM) &&
  174.             (atom_type != SKIP_ATOM) &&
  175.             (atom_type != WIDE_ATOM) &&
  176.             (atom_type != PICT_ATOM) &&
  177.             (atom_type != UUID_ATOM) &&
  178.             (atom_type != FTYP_ATOM)) {
  179.             printf("encountered non-QT top-level atom (is this a QuickTime file?)\n");
  180.             break;
  181.         }
  182.         atom_offset += atom_size;
  183.  
  184.         /* The atom header is 8 (or 16 bytes), if the atom size (which
  185.          * includes these 8 or 16 bytes) is less than that, we won't be
  186.          * able to continue scanning sensibly after this atom, so break. */
  187.         if (atom_size < 8)
  188.             break;
  189.     }
  190.  
  191.     if (atom_type != MOOV_ATOM) {
  192.         printf("last atom in file was not a moov atom\n");
  193.         free(ftyp_atom);
  194.         fclose(infile);
  195.         return 0;
  196.     }
  197.  
  198.     /* moov atom was, in fact, the last atom in the chunk; load the whole
  199.      * moov atom */
  200.     if (fseeko(infile, -atom_size, SEEK_END)) {
  201.         perror(argv[1]);
  202.         goto error_out;
  203.     }
  204.     last_offset    = ftello(infile);
  205.     moov_atom_size = atom_size;
  206.     moov_atom      = malloc(moov_atom_size);
  207.     if (!moov_atom) {
  208.         printf("could not allocate %"PRIu64" bytes for moov atom\n", atom_size);
  209.         goto error_out;
  210.     }
  211.     if (fread(moov_atom, atom_size, 1, infile) != 1) {
  212.         perror(argv[1]);
  213.         goto error_out;
  214.     }
  215.  
  216.     /* this utility does not support compressed atoms yet, so disqualify
  217.      * files with compressed QT atoms */
  218.     if (BE_32(&moov_atom[12]) == CMOV_ATOM) {
  219.         printf("this utility does not support compressed moov atoms yet\n");
  220.         goto error_out;
  221.     }
  222.  
  223.     /* close; will be re-opened later */
  224.     fclose(infile);
  225.     infile = NULL;
  226.  
  227.     /* crawl through the moov chunk in search of stco or co64 atoms */
  228.     for (i = 4; i < moov_atom_size - 4; i++) {
  229.         atom_type = BE_32(&moov_atom[i]);
  230.         if (atom_type == STCO_ATOM) {
  231.             printf(" patching stco atom...\n");
  232.             atom_size = (uint32_t)BE_32(&moov_atom[i - 4]);
  233.             if (i + atom_size - 4 > moov_atom_size) {
  234.                 printf(" bad atom size\n");
  235.                 goto error_out;
  236.             }
  237.             offset_count = BE_32(&moov_atom[i + 8]);
  238.             if (i + 12LL + offset_count * 4LL > moov_atom_size) {
  239.                 printf(" bad atom size\n");
  240.                 goto error_out;
  241.             }
  242.             for (j = 0; j < offset_count; j++) {
  243.                 current_offset  = (uint32_t)BE_32(&moov_atom[i + 12 + j * 4]);
  244.                 current_offset += moov_atom_size;
  245.                 moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF;
  246.                 moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF;
  247.                 moov_atom[i + 12 + j * 4 + 2] = (current_offset >>  8) & 0xFF;
  248.                 moov_atom[i + 12 + j * 4 + 3] = (current_offset >>  0) & 0xFF;
  249.             }
  250.             i += atom_size - 4;
  251.         } else if (atom_type == CO64_ATOM) {
  252.             printf(" patching co64 atom...\n");
  253.             atom_size = (uint32_t)BE_32(&moov_atom[i - 4]);
  254.             if (i + atom_size - 4 > moov_atom_size) {
  255.                 printf(" bad atom size\n");
  256.                 goto error_out;
  257.             }
  258.             offset_count = BE_32(&moov_atom[i + 8]);
  259.             if (i + 12LL + offset_count * 8LL > moov_atom_size) {
  260.                 printf(" bad atom size\n");
  261.                 goto error_out;
  262.             }
  263.             for (j = 0; j < offset_count; j++) {
  264.                 current_offset  = BE_64(&moov_atom[i + 12 + j * 8]);
  265.                 current_offset += moov_atom_size;
  266.                 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF;
  267.                 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF;
  268.                 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF;
  269.                 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF;
  270.                 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF;
  271.                 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF;
  272.                 moov_atom[i + 12 + j * 8 + 6] = (current_offset >>  8) & 0xFF;
  273.                 moov_atom[i + 12 + j * 8 + 7] = (current_offset >>  0) & 0xFF;
  274.             }
  275.             i += atom_size - 4;
  276.         }
  277.     }
  278.  
  279.     /* re-open the input file and open the output file */
  280.     infile = fopen(argv[1], "rb");
  281.     if (!infile) {
  282.         perror(argv[1]);
  283.         goto error_out;
  284.     }
  285.  
  286.     if (start_offset > 0) { /* seek after ftyp atom */
  287.         if (fseeko(infile, start_offset, SEEK_SET)) {
  288.             perror(argv[1]);
  289.             goto error_out;
  290.         }
  291.  
  292.         last_offset -= start_offset;
  293.     }
  294.  
  295.     outfile = fopen(argv[2], "wb");
  296.     if (!outfile) {
  297.         perror(argv[2]);
  298.         goto error_out;
  299.     }
  300.  
  301.     /* dump the same ftyp atom */
  302.     if (ftyp_atom_size > 0) {
  303.         printf(" writing ftyp atom...\n");
  304.         if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) {
  305.             perror(argv[2]);
  306.             goto error_out;
  307.         }
  308.     }
  309.  
  310.     /* dump the new moov atom */
  311.     printf(" writing moov atom...\n");
  312.     if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) {
  313.         perror(argv[2]);
  314.         goto error_out;
  315.     }
  316.  
  317.     /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */
  318.     bytes_to_copy = FFMIN(COPY_BUFFER_SIZE, last_offset);
  319.     copy_buffer = malloc(bytes_to_copy);
  320.     if (!copy_buffer) {
  321.         printf("could not allocate %d bytes for copy_buffer\n", bytes_to_copy);
  322.         goto error_out;
  323.     }
  324.     printf(" copying rest of file...\n");
  325.     while (last_offset) {
  326.         bytes_to_copy = FFMIN(bytes_to_copy, last_offset);
  327.  
  328.         if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) {
  329.             perror(argv[1]);
  330.             goto error_out;
  331.         }
  332.         if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) {
  333.             perror(argv[2]);
  334.             goto error_out;
  335.         }
  336.         last_offset -= bytes_to_copy;
  337.     }
  338.  
  339.     fclose(infile);
  340.     fclose(outfile);
  341.     free(moov_atom);
  342.     free(ftyp_atom);
  343.     free(copy_buffer);
  344.  
  345.     return 0;
  346.  
  347. error_out:
  348.     if (infile)
  349.         fclose(infile);
  350.     if (outfile)
  351.         fclose(outfile);
  352.     free(moov_atom);
  353.     free(ftyp_atom);
  354.     free(copy_buffer);
  355.     return 1;
  356. }
  357.