yading@11: /*
yading@11:  * qt-faststart.c, v0.2
yading@11:  * by Mike Melanson (melanson@pcisys.net)
yading@11:  * This file is placed in the public domain. Use the program however you
yading@11:  * see fit.
yading@11:  *
yading@11:  * This utility rearranges a Quicktime file such that the moov atom
yading@11:  * is in front of the data, thus facilitating network streaming.
yading@11:  *
yading@11:  * To compile this program, start from the base directory from which you
yading@11:  * are building FFmpeg and type:
yading@11:  *  make tools/qt-faststart
yading@11:  * The qt-faststart program will be built in the tools/ directory. If you
yading@11:  * do not build the program in this manner, correct results are not
yading@11:  * guaranteed, particularly on 64-bit platforms.
yading@11:  * Invoke the program with:
yading@11:  *  qt-faststart <infile.mov> <outfile.mov>
yading@11:  *
yading@11:  * Notes: Quicktime files can come in many configurations of top-level
yading@11:  * atoms. This utility stipulates that the very last atom in the file needs
yading@11:  * to be a moov atom. When given such a file, this utility will rearrange
yading@11:  * the top-level atoms by shifting the moov atom from the back of the file
yading@11:  * to the front, and patch the chunk offsets along the way. This utility
yading@11:  * presently only operates on uncompressed moov atoms.
yading@11:  */
yading@11: 
yading@11: #include <stdio.h>
yading@11: #include <stdlib.h>
yading@11: #include <inttypes.h>
yading@11: #include <string.h>
yading@11: 
yading@11: #ifdef __MINGW32__
yading@11: #define fseeko(x, y, z) fseeko64(x, y, z)
yading@11: #define ftello(x)       ftello64(x)
yading@11: #elif defined(_WIN32)
yading@11: #define fseeko(x, y, z) _fseeki64(x, y, z)
yading@11: #define ftello(x)       _ftelli64(x)
yading@11: #endif
yading@11: 
yading@11: #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
yading@11: 
yading@11: #define BE_16(x) ((((uint8_t*)(x))[0] <<  8) | ((uint8_t*)(x))[1])
yading@11: 
yading@11: #define BE_32(x) ((((uint8_t*)(x))[0] << 24) |  \
yading@11:                   (((uint8_t*)(x))[1] << 16) |  \
yading@11:                   (((uint8_t*)(x))[2] <<  8) |  \
yading@11:                    ((uint8_t*)(x))[3])
yading@11: 
yading@11: #define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[1]) << 48) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[2]) << 40) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[3]) << 32) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[4]) << 24) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[5]) << 16) |  \
yading@11:                   ((uint64_t)(((uint8_t*)(x))[6]) <<  8) |  \
yading@11:                   ((uint64_t)( (uint8_t*)(x))[7]))
yading@11: 
yading@11: #define BE_FOURCC(ch0, ch1, ch2, ch3)           \
yading@11:     ( (uint32_t)(unsigned char)(ch3)        |   \
yading@11:      ((uint32_t)(unsigned char)(ch2) <<  8) |   \
yading@11:      ((uint32_t)(unsigned char)(ch1) << 16) |   \
yading@11:      ((uint32_t)(unsigned char)(ch0) << 24) )
yading@11: 
yading@11: #define QT_ATOM BE_FOURCC
yading@11: /* top level atoms */
yading@11: #define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e')
yading@11: #define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k')
yading@11: #define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't')
yading@11: #define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v')
yading@11: #define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't')
yading@11: #define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p')
yading@11: #define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e')
yading@11: #define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T')
yading@11: #define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p')
yading@11: #define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd')
yading@11: 
yading@11: #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v')
yading@11: #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o')
yading@11: #define CO64_ATOM QT_ATOM('c', 'o', '6', '4')
yading@11: 
yading@11: #define ATOM_PREAMBLE_SIZE    8
yading@11: #define COPY_BUFFER_SIZE   33554432
yading@11: 
yading@11: int main(int argc, char *argv[])
yading@11: {
yading@11:     FILE *infile  = NULL;
yading@11:     FILE *outfile = NULL;
yading@11:     unsigned char atom_bytes[ATOM_PREAMBLE_SIZE];
yading@11:     uint32_t atom_type   = 0;
yading@11:     uint64_t atom_size   = 0;
yading@11:     uint64_t atom_offset = 0;
yading@11:     uint64_t last_offset;
yading@11:     unsigned char *moov_atom = NULL;
yading@11:     unsigned char *ftyp_atom = NULL;
yading@11:     uint64_t moov_atom_size;
yading@11:     uint64_t ftyp_atom_size = 0;
yading@11:     uint64_t i, j;
yading@11:     uint32_t offset_count;
yading@11:     uint64_t current_offset;
yading@11:     int64_t start_offset = 0;
yading@11:     unsigned char *copy_buffer = NULL;
yading@11:     int bytes_to_copy;
yading@11: 
yading@11:     if (argc != 3) {
yading@11:         printf("Usage: qt-faststart <infile.mov> <outfile.mov>\n");
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     if (!strcmp(argv[1], argv[2])) {
yading@11:         fprintf(stderr, "input and output files need to be different\n");
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     infile = fopen(argv[1], "rb");
yading@11:     if (!infile) {
yading@11:         perror(argv[1]);
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     /* traverse through the atoms in the file to make sure that 'moov' is
yading@11:      * at the end */
yading@11:     while (!feof(infile)) {
yading@11:         if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
yading@11:             break;
yading@11:         }
yading@11:         atom_size = (uint32_t) BE_32(&atom_bytes[0]);
yading@11:         atom_type = BE_32(&atom_bytes[4]);
yading@11: 
yading@11:         /* keep ftyp atom */
yading@11:         if (atom_type == FTYP_ATOM) {
yading@11:             ftyp_atom_size = atom_size;
yading@11:             free(ftyp_atom);
yading@11:             ftyp_atom = malloc(ftyp_atom_size);
yading@11:             if (!ftyp_atom) {
yading@11:                 printf("could not allocate %"PRIu64" bytes for ftyp atom\n",
yading@11:                        atom_size);
yading@11:                 goto error_out;
yading@11:             }
yading@11:             if (   fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR)
yading@11:                 || fread(ftyp_atom, atom_size, 1, infile) != 1
yading@11:                 || (start_offset = ftello(infile))<0) {
yading@11:                 perror(argv[1]);
yading@11:                 goto error_out;
yading@11:             }
yading@11:         } else {
yading@11:             int ret;
yading@11:             /* 64-bit special case */
yading@11:             if (atom_size == 1) {
yading@11:                 if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) {
yading@11:                     break;
yading@11:                 }
yading@11:                 atom_size = BE_64(&atom_bytes[0]);
yading@11:                 ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR);
yading@11:             } else {
yading@11:                 ret = fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR);
yading@11:             }
yading@11:             if(ret) {
yading@11:                 perror(argv[1]);
yading@11:                 goto error_out;
yading@11:             }
yading@11:         }
yading@11:         printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n",
yading@11:                (atom_type >> 24) & 255,
yading@11:                (atom_type >> 16) & 255,
yading@11:                (atom_type >>  8) & 255,
yading@11:                (atom_type >>  0) & 255,
yading@11:                atom_offset,
yading@11:                atom_size);
yading@11:         if ((atom_type != FREE_ATOM) &&
yading@11:             (atom_type != JUNK_ATOM) &&
yading@11:             (atom_type != MDAT_ATOM) &&
yading@11:             (atom_type != MOOV_ATOM) &&
yading@11:             (atom_type != PNOT_ATOM) &&
yading@11:             (atom_type != SKIP_ATOM) &&
yading@11:             (atom_type != WIDE_ATOM) &&
yading@11:             (atom_type != PICT_ATOM) &&
yading@11:             (atom_type != UUID_ATOM) &&
yading@11:             (atom_type != FTYP_ATOM)) {
yading@11:             printf("encountered non-QT top-level atom (is this a QuickTime file?)\n");
yading@11:             break;
yading@11:         }
yading@11:         atom_offset += atom_size;
yading@11: 
yading@11:         /* The atom header is 8 (or 16 bytes), if the atom size (which
yading@11:          * includes these 8 or 16 bytes) is less than that, we won't be
yading@11:          * able to continue scanning sensibly after this atom, so break. */
yading@11:         if (atom_size < 8)
yading@11:             break;
yading@11:     }
yading@11: 
yading@11:     if (atom_type != MOOV_ATOM) {
yading@11:         printf("last atom in file was not a moov atom\n");
yading@11:         free(ftyp_atom);
yading@11:         fclose(infile);
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     /* moov atom was, in fact, the last atom in the chunk; load the whole
yading@11:      * moov atom */
yading@11:     if (fseeko(infile, -atom_size, SEEK_END)) {
yading@11:         perror(argv[1]);
yading@11:         goto error_out;
yading@11:     }
yading@11:     last_offset    = ftello(infile);
yading@11:     moov_atom_size = atom_size;
yading@11:     moov_atom      = malloc(moov_atom_size);
yading@11:     if (!moov_atom) {
yading@11:         printf("could not allocate %"PRIu64" bytes for moov atom\n", atom_size);
yading@11:         goto error_out;
yading@11:     }
yading@11:     if (fread(moov_atom, atom_size, 1, infile) != 1) {
yading@11:         perror(argv[1]);
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     /* this utility does not support compressed atoms yet, so disqualify
yading@11:      * files with compressed QT atoms */
yading@11:     if (BE_32(&moov_atom[12]) == CMOV_ATOM) {
yading@11:         printf("this utility does not support compressed moov atoms yet\n");
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     /* close; will be re-opened later */
yading@11:     fclose(infile);
yading@11:     infile = NULL;
yading@11: 
yading@11:     /* crawl through the moov chunk in search of stco or co64 atoms */
yading@11:     for (i = 4; i < moov_atom_size - 4; i++) {
yading@11:         atom_type = BE_32(&moov_atom[i]);
yading@11:         if (atom_type == STCO_ATOM) {
yading@11:             printf(" patching stco atom...\n");
yading@11:             atom_size = BE_32(&moov_atom[i - 4]);
yading@11:             if (i + atom_size - 4 > moov_atom_size) {
yading@11:                 printf(" bad atom size\n");
yading@11:                 goto error_out;
yading@11:             }
yading@11:             offset_count = BE_32(&moov_atom[i + 8]);
yading@11:             if (i + 12LL + offset_count * 4LL > moov_atom_size) {
yading@11:                 printf(" bad atom size\n");
yading@11:                 goto error_out;
yading@11:             }
yading@11:             for (j = 0; j < offset_count; j++) {
yading@11:                 current_offset  = BE_32(&moov_atom[i + 12 + j * 4]);
yading@11:                 current_offset += moov_atom_size;
yading@11:                 moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 4 + 2] = (current_offset >>  8) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 4 + 3] = (current_offset >>  0) & 0xFF;
yading@11:             }
yading@11:             i += atom_size - 4;
yading@11:         } else if (atom_type == CO64_ATOM) {
yading@11:             printf(" patching co64 atom...\n");
yading@11:             atom_size = BE_32(&moov_atom[i - 4]);
yading@11:             if (i + atom_size - 4 > moov_atom_size) {
yading@11:                 printf(" bad atom size\n");
yading@11:                 goto error_out;
yading@11:             }
yading@11:             offset_count = BE_32(&moov_atom[i + 8]);
yading@11:             if (i + 12LL + offset_count * 8LL > moov_atom_size) {
yading@11:                 printf(" bad atom size\n");
yading@11:                 goto error_out;
yading@11:             }
yading@11:             for (j = 0; j < offset_count; j++) {
yading@11:                 current_offset  = BE_64(&moov_atom[i + 12 + j * 8]);
yading@11:                 current_offset += moov_atom_size;
yading@11:                 moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 6] = (current_offset >>  8) & 0xFF;
yading@11:                 moov_atom[i + 12 + j * 8 + 7] = (current_offset >>  0) & 0xFF;
yading@11:             }
yading@11:             i += atom_size - 4;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     /* re-open the input file and open the output file */
yading@11:     infile = fopen(argv[1], "rb");
yading@11:     if (!infile) {
yading@11:         perror(argv[1]);
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     if (start_offset > 0) { /* seek after ftyp atom */
yading@11:         if (fseeko(infile, start_offset, SEEK_SET)) {
yading@11:             perror(argv[1]);
yading@11:             goto error_out;
yading@11:         }
yading@11: 
yading@11:         last_offset -= start_offset;
yading@11:     }
yading@11: 
yading@11:     outfile = fopen(argv[2], "wb");
yading@11:     if (!outfile) {
yading@11:         perror(argv[2]);
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     /* dump the same ftyp atom */
yading@11:     if (ftyp_atom_size > 0) {
yading@11:         printf(" writing ftyp atom...\n");
yading@11:         if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) {
yading@11:             perror(argv[2]);
yading@11:             goto error_out;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     /* dump the new moov atom */
yading@11:     printf(" writing moov atom...\n");
yading@11:     if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) {
yading@11:         perror(argv[2]);
yading@11:         goto error_out;
yading@11:     }
yading@11: 
yading@11:     /* copy the remainder of the infile, from offset 0 -> last_offset - 1 */
yading@11:     bytes_to_copy = FFMIN(COPY_BUFFER_SIZE, last_offset);
yading@11:     copy_buffer = malloc(bytes_to_copy);
yading@11:     if (!copy_buffer) {
yading@11:         printf("could not allocate %d bytes for copy_buffer\n", bytes_to_copy);
yading@11:         goto error_out;
yading@11:     }
yading@11:     printf(" copying rest of file...\n");
yading@11:     while (last_offset) {
yading@11:         bytes_to_copy = FFMIN(bytes_to_copy, last_offset);
yading@11: 
yading@11:         if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) {
yading@11:             perror(argv[1]);
yading@11:             goto error_out;
yading@11:         }
yading@11:         if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) {
yading@11:             perror(argv[2]);
yading@11:             goto error_out;
yading@11:         }
yading@11:         last_offset -= bytes_to_copy;
yading@11:     }
yading@11: 
yading@11:     fclose(infile);
yading@11:     fclose(outfile);
yading@11:     free(moov_atom);
yading@11:     free(ftyp_atom);
yading@11:     free(copy_buffer);
yading@11: 
yading@11:     return 0;
yading@11: 
yading@11: error_out:
yading@11:     if (infile)
yading@11:         fclose(infile);
yading@11:     if (outfile)
yading@11:         fclose(outfile);
yading@11:     free(moov_atom);
yading@11:     free(ftyp_atom);
yading@11:     free(copy_buffer);
yading@11:     return 1;
yading@11: }