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327 lines
11 KiB
327 lines
11 KiB
/* |
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* qt-faststart.c, v0.2 |
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* by Mike Melanson (melanson@pcisys.net) |
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* This file is placed in the public domain. Use the program however you |
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* see fit. |
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* |
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* This utility rearranges a Quicktime file such that the moov atom |
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* is in front of the data, thus facilitating network streaming. |
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* |
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* To compile this program, start from the base directory from which you |
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* are building Libav and type: |
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* make tools/qt-faststart |
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* The qt-faststart program will be built in the tools/ directory. If you |
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* do not build the program in this manner, correct results are not |
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* guaranteed, particularly on 64-bit platforms. |
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* Invoke the program with: |
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* qt-faststart <infile.mov> <outfile.mov> |
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* |
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* Notes: Quicktime files can come in many configurations of top-level |
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* atoms. This utility stipulates that the very last atom in the file needs |
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* to be a moov atom. When given such a file, this utility will rearrange |
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* the top-level atoms by shifting the moov atom from the back of the file |
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* to the front, and patch the chunk offsets along the way. This utility |
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* presently only operates on uncompressed moov atoms. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <inttypes.h> |
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#include <string.h> |
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|
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#ifdef __MINGW32__ |
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#define fseeko(x, y, z) fseeko64(x, y, z) |
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#define ftello(x) ftello64(x) |
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#endif |
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#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) |
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#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \ |
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(((uint8_t*)(x))[1] << 16) | \ |
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(((uint8_t*)(x))[2] << 8) | \ |
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((uint8_t*)(x))[3]) |
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|
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#define BE_64(x) (((uint64_t)(((uint8_t*)(x))[0]) << 56) | \ |
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((uint64_t)(((uint8_t*)(x))[1]) << 48) | \ |
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((uint64_t)(((uint8_t*)(x))[2]) << 40) | \ |
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((uint64_t)(((uint8_t*)(x))[3]) << 32) | \ |
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((uint64_t)(((uint8_t*)(x))[4]) << 24) | \ |
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((uint64_t)(((uint8_t*)(x))[5]) << 16) | \ |
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((uint64_t)(((uint8_t*)(x))[6]) << 8) | \ |
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((uint64_t)( (uint8_t*)(x))[7])) |
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|
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#define BE_FOURCC(ch0, ch1, ch2, ch3) \ |
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( (uint32_t)(unsigned char)(ch3) | \ |
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((uint32_t)(unsigned char)(ch2) << 8) | \ |
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((uint32_t)(unsigned char)(ch1) << 16) | \ |
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((uint32_t)(unsigned char)(ch0) << 24) ) |
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|
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#define QT_ATOM BE_FOURCC |
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/* top level atoms */ |
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#define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e') |
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#define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k') |
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#define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't') |
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#define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v') |
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#define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't') |
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#define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p') |
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#define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e') |
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#define PICT_ATOM QT_ATOM('P', 'I', 'C', 'T') |
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#define FTYP_ATOM QT_ATOM('f', 't', 'y', 'p') |
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#define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd') |
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#define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v') |
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#define STCO_ATOM QT_ATOM('s', 't', 'c', 'o') |
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#define CO64_ATOM QT_ATOM('c', 'o', '6', '4') |
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#define ATOM_PREAMBLE_SIZE 8 |
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#define COPY_BUFFER_SIZE 1024 |
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int main(int argc, char *argv[]) |
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{ |
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FILE *infile = NULL; |
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FILE *outfile = NULL; |
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unsigned char atom_bytes[ATOM_PREAMBLE_SIZE]; |
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uint32_t atom_type = 0; |
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uint64_t atom_size = 0; |
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uint64_t atom_offset = 0; |
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uint64_t last_offset; |
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unsigned char *moov_atom = NULL; |
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unsigned char *ftyp_atom = NULL; |
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uint64_t moov_atom_size; |
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uint64_t ftyp_atom_size = 0; |
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uint64_t i, j; |
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uint32_t offset_count; |
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uint64_t current_offset; |
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uint64_t start_offset = 0; |
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unsigned char copy_buffer[COPY_BUFFER_SIZE]; |
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int bytes_to_copy; |
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|
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if (argc != 3) { |
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printf("Usage: qt-faststart <infile.mov> <outfile.mov>\n"); |
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return 0; |
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} |
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if (!strcmp(argv[1], argv[2])) { |
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fprintf(stderr, "input and output files need to be different\n"); |
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return 1; |
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} |
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infile = fopen(argv[1], "rb"); |
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if (!infile) { |
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perror(argv[1]); |
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goto error_out; |
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} |
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/* traverse through the atoms in the file to make sure that 'moov' is |
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* at the end */ |
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while (!feof(infile)) { |
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if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { |
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break; |
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} |
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atom_size = (uint32_t) BE_32(&atom_bytes[0]); |
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atom_type = BE_32(&atom_bytes[4]); |
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|
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/* keep ftyp atom */ |
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if (atom_type == FTYP_ATOM) { |
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ftyp_atom_size = atom_size; |
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free(ftyp_atom); |
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ftyp_atom = malloc(ftyp_atom_size); |
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if (!ftyp_atom) { |
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printf("could not allocate %"PRIu64" bytes for ftyp atom\n", |
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atom_size); |
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goto error_out; |
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} |
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fseeko(infile, -ATOM_PREAMBLE_SIZE, SEEK_CUR); |
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if (fread(ftyp_atom, atom_size, 1, infile) != 1) { |
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perror(argv[1]); |
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goto error_out; |
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} |
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start_offset = ftello(infile); |
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} else { |
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/* 64-bit special case */ |
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if (atom_size == 1) { |
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if (fread(atom_bytes, ATOM_PREAMBLE_SIZE, 1, infile) != 1) { |
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break; |
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} |
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atom_size = BE_64(&atom_bytes[0]); |
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fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE * 2, SEEK_CUR); |
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} else { |
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fseeko(infile, atom_size - ATOM_PREAMBLE_SIZE, SEEK_CUR); |
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} |
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} |
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printf("%c%c%c%c %10"PRIu64" %"PRIu64"\n", |
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(atom_type >> 24) & 255, |
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(atom_type >> 16) & 255, |
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(atom_type >> 8) & 255, |
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(atom_type >> 0) & 255, |
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atom_offset, |
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atom_size); |
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if ((atom_type != FREE_ATOM) && |
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(atom_type != JUNK_ATOM) && |
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(atom_type != MDAT_ATOM) && |
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(atom_type != MOOV_ATOM) && |
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(atom_type != PNOT_ATOM) && |
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(atom_type != SKIP_ATOM) && |
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(atom_type != WIDE_ATOM) && |
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(atom_type != PICT_ATOM) && |
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(atom_type != UUID_ATOM) && |
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(atom_type != FTYP_ATOM)) { |
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printf("encountered non-QT top-level atom (is this a QuickTime file?)\n"); |
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break; |
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} |
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atom_offset += atom_size; |
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/* The atom header is 8 (or 16 bytes), if the atom size (which |
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* includes these 8 or 16 bytes) is less than that, we won't be |
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* able to continue scanning sensibly after this atom, so break. */ |
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if (atom_size < 8) |
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break; |
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} |
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if (atom_type != MOOV_ATOM) { |
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printf("last atom in file was not a moov atom\n"); |
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free(ftyp_atom); |
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fclose(infile); |
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return 0; |
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} |
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/* moov atom was, in fact, the last atom in the chunk; load the whole |
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* moov atom */ |
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fseeko(infile, -atom_size, SEEK_END); |
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last_offset = ftello(infile); |
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moov_atom_size = atom_size; |
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moov_atom = malloc(moov_atom_size); |
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if (!moov_atom) { |
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printf("could not allocate %"PRIu64" bytes for moov atom\n", atom_size); |
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goto error_out; |
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} |
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if (fread(moov_atom, atom_size, 1, infile) != 1) { |
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perror(argv[1]); |
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goto error_out; |
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} |
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/* this utility does not support compressed atoms yet, so disqualify |
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* files with compressed QT atoms */ |
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if (BE_32(&moov_atom[12]) == CMOV_ATOM) { |
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printf("this utility does not support compressed moov atoms yet\n"); |
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goto error_out; |
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} |
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/* close; will be re-opened later */ |
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fclose(infile); |
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infile = NULL; |
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/* crawl through the moov chunk in search of stco or co64 atoms */ |
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for (i = 4; i < moov_atom_size - 4; i++) { |
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atom_type = BE_32(&moov_atom[i]); |
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if (atom_type == STCO_ATOM) { |
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printf(" patching stco atom...\n"); |
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atom_size = BE_32(&moov_atom[i - 4]); |
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if (i + atom_size - 4 > moov_atom_size) { |
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printf(" bad atom size\n"); |
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goto error_out; |
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} |
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offset_count = BE_32(&moov_atom[i + 8]); |
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for (j = 0; j < offset_count; j++) { |
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current_offset = BE_32(&moov_atom[i + 12 + j * 4]); |
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current_offset += moov_atom_size; |
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moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF; |
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moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF; |
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moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF; |
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moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF; |
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} |
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i += atom_size - 4; |
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} else if (atom_type == CO64_ATOM) { |
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printf(" patching co64 atom...\n"); |
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atom_size = BE_32(&moov_atom[i - 4]); |
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if (i + atom_size - 4 > moov_atom_size) { |
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printf(" bad atom size\n"); |
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goto error_out; |
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} |
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offset_count = BE_32(&moov_atom[i + 8]); |
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for (j = 0; j < offset_count; j++) { |
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current_offset = BE_64(&moov_atom[i + 12 + j * 8]); |
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current_offset += moov_atom_size; |
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moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF; |
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moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF; |
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} |
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i += atom_size - 4; |
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} |
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} |
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/* re-open the input file and open the output file */ |
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infile = fopen(argv[1], "rb"); |
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if (!infile) { |
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perror(argv[1]); |
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goto error_out; |
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} |
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if (start_offset > 0) { /* seek after ftyp atom */ |
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fseeko(infile, start_offset, SEEK_SET); |
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last_offset -= start_offset; |
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} |
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outfile = fopen(argv[2], "wb"); |
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if (!outfile) { |
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perror(argv[2]); |
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goto error_out; |
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} |
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/* dump the same ftyp atom */ |
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if (ftyp_atom_size > 0) { |
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printf(" writing ftyp atom...\n"); |
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if (fwrite(ftyp_atom, ftyp_atom_size, 1, outfile) != 1) { |
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perror(argv[2]); |
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goto error_out; |
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} |
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} |
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/* dump the new moov atom */ |
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printf(" writing moov atom...\n"); |
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if (fwrite(moov_atom, moov_atom_size, 1, outfile) != 1) { |
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perror(argv[2]); |
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goto error_out; |
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} |
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/* copy the remainder of the infile, from offset 0 -> last_offset - 1 */ |
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printf(" copying rest of file...\n"); |
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while (last_offset) { |
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if (last_offset > COPY_BUFFER_SIZE) |
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bytes_to_copy = COPY_BUFFER_SIZE; |
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else |
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bytes_to_copy = last_offset; |
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if (fread(copy_buffer, bytes_to_copy, 1, infile) != 1) { |
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perror(argv[1]); |
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goto error_out; |
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} |
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if (fwrite(copy_buffer, bytes_to_copy, 1, outfile) != 1) { |
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perror(argv[2]); |
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goto error_out; |
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} |
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last_offset -= bytes_to_copy; |
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} |
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fclose(infile); |
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fclose(outfile); |
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free(moov_atom); |
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free(ftyp_atom); |
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return 0; |
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error_out: |
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if (infile) |
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fclose(infile); |
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if (outfile) |
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fclose(outfile); |
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free(moov_atom); |
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free(ftyp_atom); |
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return 1; |
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}
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