diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/qt-faststart.c | 400 |
1 files changed, 345 insertions, 55 deletions
diff --git a/tools/qt-faststart.c b/tools/qt-faststart.c index 9446c11f80..07813ae35c 100644 --- a/tools/qt-faststart.c +++ b/tools/qt-faststart.c @@ -28,6 +28,7 @@ #include <stdlib.h> #include <inttypes.h> #include <string.h> +#include <limits.h> #ifdef __MINGW32__ #undef fseeko @@ -43,8 +44,6 @@ #define MIN(a,b) ((a) > (b) ? (b) : (a)) -#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) - #define BE_32(x) (((uint32_t)(((uint8_t*)(x))[0]) << 24) | \ (((uint8_t*)(x))[1] << 16) | \ (((uint8_t*)(x))[2] << 8) | \ @@ -59,6 +58,18 @@ ((uint64_t)(((uint8_t*)(x))[6]) << 8) | \ ((uint64_t)( (uint8_t*)(x))[7])) +#define AV_WB32(p, val) { \ + ((uint8_t*)(p))[0] = ((val) >> 24) & 0xff; \ + ((uint8_t*)(p))[1] = ((val) >> 16) & 0xff; \ + ((uint8_t*)(p))[2] = ((val) >> 8) & 0xff; \ + ((uint8_t*)(p))[3] = (val) & 0xff; \ + } + +#define AV_WB64(p, val) { \ + AV_WB32(p, (val) >> 32) \ + AV_WB32(p + 4, val) \ + } + #define BE_FOURCC(ch0, ch1, ch2, ch3) \ ( (uint32_t)(unsigned char)(ch3) | \ ((uint32_t)(unsigned char)(ch2) << 8) | \ @@ -79,6 +90,10 @@ #define UUID_ATOM QT_ATOM('u', 'u', 'i', 'd') #define CMOV_ATOM QT_ATOM('c', 'm', 'o', 'v') +#define TRAK_ATOM QT_ATOM('t', 'r', 'a', 'k') +#define MDIA_ATOM QT_ATOM('m', 'd', 'i', 'a') +#define MINF_ATOM QT_ATOM('m', 'i', 'n', 'f') +#define STBL_ATOM QT_ATOM('s', 't', 'b', 'l') #define STCO_ATOM QT_ATOM('s', 't', 'c', 'o') #define CO64_ATOM QT_ATOM('c', 'o', '6', '4') @@ -86,6 +101,332 @@ #define COPY_BUFFER_SIZE 33554432 #define MAX_FTYP_ATOM_SIZE 1048576 +typedef struct { + uint32_t type; + uint32_t header_size; + uint64_t size; + unsigned char *data; +} atom_t; + +typedef struct { + uint64_t moov_atom_size; + uint64_t stco_offset_count; + uint64_t stco_data_size; + int stco_overflow; + uint32_t depth; +} update_chunk_offsets_context_t; + +typedef struct { + unsigned char *dest; + uint64_t original_moov_size; + uint64_t new_moov_size; +} upgrade_stco_context_t; + +typedef int (*parse_atoms_callback_t)(void *context, atom_t *atom); + +static int parse_atoms( + unsigned char *buf, + uint64_t size, + parse_atoms_callback_t callback, + void *context) +{ + unsigned char *pos = buf; + unsigned char *end = pos + size; + atom_t atom; + int ret; + + while (end - pos >= ATOM_PREAMBLE_SIZE) { + atom.size = BE_32(pos); + atom.type = BE_32(pos + 4); + pos += ATOM_PREAMBLE_SIZE; + atom.header_size = ATOM_PREAMBLE_SIZE; + + switch (atom.size) { + case 1: + if (end - pos < 8) { + printf("not enough room for 64 bit atom size\n"); + return -1; + } + + atom.size = BE_64(pos); + pos += 8; + atom.header_size = ATOM_PREAMBLE_SIZE + 8; + break; + + case 0: + atom.size = ATOM_PREAMBLE_SIZE + end - pos; + break; + } + + if (atom.size < atom.header_size) { + printf("atom size %"PRIu64" too small\n", atom.size); + return -1; + } + + atom.size -= atom.header_size; + + if (atom.size > end - pos) { + printf("atom size %"PRIu64" too big\n", atom.size); + return -1; + } + + atom.data = pos; + ret = callback(context, &atom); + if (ret < 0) { + return ret; + } + + pos += atom.size; + } + + return 0; +} + +static int update_stco_offsets(update_chunk_offsets_context_t *context, atom_t *atom) +{ + uint32_t current_offset; + uint32_t offset_count; + unsigned char *pos; + unsigned char *end; + + printf(" patching stco atom...\n"); + if (atom->size < 8) { + printf("stco atom size %"PRIu64" too small\n", atom->size); + return -1; + } + + offset_count = BE_32(atom->data + 4); + if (offset_count > (atom->size - 8) / 4) { + printf("stco offset count %"PRIu32" too big\n", offset_count); + return -1; + } + + context->stco_offset_count += offset_count; + context->stco_data_size += atom->size - 8; + + for (pos = atom->data + 8, end = pos + offset_count * 4; + pos < end; + pos += 4) { + current_offset = BE_32(pos); + if (current_offset > UINT_MAX - context->moov_atom_size) { + context->stco_overflow = 1; + } + current_offset += context->moov_atom_size; + AV_WB32(pos, current_offset); + } + + return 0; +} + +static int update_co64_offsets(update_chunk_offsets_context_t *context, atom_t *atom) +{ + uint64_t current_offset; + uint32_t offset_count; + unsigned char *pos; + unsigned char *end; + + printf(" patching co64 atom...\n"); + if (atom->size < 8) { + printf("co64 atom size %"PRIu64" too small\n", atom->size); + return -1; + } + + offset_count = BE_32(atom->data + 4); + if (offset_count > (atom->size - 8) / 8) { + printf("co64 offset count %"PRIu32" too big\n", offset_count); + return -1; + } + + for (pos = atom->data + 8, end = pos + offset_count * 8; + pos < end; + pos += 8) { + current_offset = BE_64(pos); + current_offset += context->moov_atom_size; + AV_WB64(pos, current_offset); + } + + return 0; +} + +static int update_chunk_offsets_callback(void *ctx, atom_t *atom) +{ + update_chunk_offsets_context_t *context = ctx; + int ret; + + switch (atom->type) { + case STCO_ATOM: + return update_stco_offsets(context, atom); + + case CO64_ATOM: + return update_co64_offsets(context, atom); + + case MOOV_ATOM: + case TRAK_ATOM: + case MDIA_ATOM: + case MINF_ATOM: + case STBL_ATOM: + context->depth++; + if (context->depth > 10) { + printf("atoms too deeply nested\n"); + return -1; + } + + ret = parse_atoms( + atom->data, + atom->size, + update_chunk_offsets_callback, + context); + context->depth--; + return ret; + } + + return 0; +} + +static void set_atom_size(unsigned char *header, uint32_t header_size, uint64_t size) +{ + switch (header_size) { + case 8: + AV_WB32(header, size); + break; + + case 16: + AV_WB64(header + 8, size); + break; + } +} + +static void upgrade_stco_atom(upgrade_stco_context_t *context, atom_t *atom) +{ + unsigned char *pos; + unsigned char *end; + uint64_t new_offset; + uint32_t offset_count; + uint32_t original_offset; + + /* Note: not performing validations since they were performed on the first pass */ + + offset_count = BE_32(atom->data + 4); + + /* write the header */ + memcpy(context->dest, atom->data - atom->header_size, atom->header_size + 8); + AV_WB32(context->dest + 4, CO64_ATOM); + set_atom_size(context->dest, atom->header_size, atom->header_size + 8 + offset_count * 8); + context->dest += atom->header_size + 8; + + /* write the data */ + for (pos = atom->data + 8, end = pos + offset_count * 4; + pos < end; + pos += 4) { + original_offset = BE_32(pos) - context->original_moov_size; + new_offset = (uint64_t)original_offset + context->new_moov_size; + AV_WB64(context->dest, new_offset); + context->dest += 8; + } +} + +static int upgrade_stco_callback(void *ctx, atom_t *atom) +{ + upgrade_stco_context_t *context = ctx; + unsigned char *start_pos; + uint64_t copy_size; + + switch (atom->type) { + case STCO_ATOM: + upgrade_stco_atom(context, atom); + break; + + case MOOV_ATOM: + case TRAK_ATOM: + case MDIA_ATOM: + case MINF_ATOM: + case STBL_ATOM: + /* write the atom header */ + memcpy(context->dest, atom->data - atom->header_size, atom->header_size); + start_pos = context->dest; + context->dest += atom->header_size; + + /* parse internal atoms*/ + if (parse_atoms( + atom->data, + atom->size, + upgrade_stco_callback, + context) < 0) { + return -1; + } + + /* update the atom size */ + set_atom_size(start_pos, atom->header_size, context->dest - start_pos); + break; + + default: + copy_size = atom->header_size + atom->size; + memcpy(context->dest, atom->data - atom->header_size, copy_size); + context->dest += copy_size; + break; + } + + return 0; +} + +static int update_moov_atom( + unsigned char **moov_atom, + uint64_t *moov_atom_size) +{ + update_chunk_offsets_context_t update_context = { 0 }; + upgrade_stco_context_t upgrade_context; + unsigned char *new_moov_atom; + + update_context.moov_atom_size = *moov_atom_size; + + if (parse_atoms( + *moov_atom, + *moov_atom_size, + update_chunk_offsets_callback, + &update_context) < 0) { + return -1; + } + + if (!update_context.stco_overflow) { + return 0; + } + + printf(" upgrading stco atoms to co64...\n"); + upgrade_context.new_moov_size = *moov_atom_size + + update_context.stco_offset_count * 8 - + update_context.stco_data_size; + + new_moov_atom = malloc(upgrade_context.new_moov_size); + if (new_moov_atom == NULL) { + printf("could not allocate %"PRIu64" bytes for updated moov atom\n", + upgrade_context.new_moov_size); + return -1; + } + + upgrade_context.original_moov_size = *moov_atom_size; + upgrade_context.dest = new_moov_atom; + + if (parse_atoms( + *moov_atom, + *moov_atom_size, + upgrade_stco_callback, + &upgrade_context) < 0) { + free(new_moov_atom); + return -1; + } + + free(*moov_atom); + *moov_atom = new_moov_atom; + *moov_atom_size = upgrade_context.new_moov_size; + + if (upgrade_context.dest != *moov_atom + *moov_atom_size) { + printf("unexpected - wrong number of moov bytes written\n"); + return -1; + } + + return 0; +} + int main(int argc, char *argv[]) { FILE *infile = NULL; @@ -99,9 +440,6 @@ int main(int argc, char *argv[]) unsigned char *ftyp_atom = NULL; uint64_t moov_atom_size; uint64_t ftyp_atom_size = 0; - uint64_t i, j; - uint32_t offset_count; - uint64_t current_offset; int64_t start_offset = 0; unsigned char *copy_buffer = NULL; int bytes_to_copy; @@ -244,56 +582,8 @@ int main(int argc, char *argv[]) fclose(infile); infile = NULL; - /* crawl through the moov chunk in search of stco or co64 atoms */ - for (i = 4; i < moov_atom_size - 4; i++) { - atom_type = BE_32(&moov_atom[i]); - if (atom_type == STCO_ATOM) { - printf(" patching stco atom...\n"); - atom_size = BE_32(&moov_atom[i - 4]); - if (atom_size < 16 || atom_size > moov_atom_size - i + 4) { - printf(" bad atom size\n"); - goto error_out; - } - offset_count = BE_32(&moov_atom[i + 8]); - if (offset_count > (atom_size - 16) / 4) { - printf(" bad atom size/element count\n"); - goto error_out; - } - for (j = 0; j < offset_count; j++) { - current_offset = BE_32(&moov_atom[i + 12 + j * 4]); - current_offset += moov_atom_size; - moov_atom[i + 12 + j * 4 + 0] = (current_offset >> 24) & 0xFF; - moov_atom[i + 12 + j * 4 + 1] = (current_offset >> 16) & 0xFF; - moov_atom[i + 12 + j * 4 + 2] = (current_offset >> 8) & 0xFF; - moov_atom[i + 12 + j * 4 + 3] = (current_offset >> 0) & 0xFF; - } - i += atom_size - 4; - } else if (atom_type == CO64_ATOM) { - printf(" patching co64 atom...\n"); - atom_size = BE_32(&moov_atom[i - 4]); - if (atom_size < 16 || atom_size > moov_atom_size - i + 4) { - printf(" bad atom size\n"); - goto error_out; - } - offset_count = BE_32(&moov_atom[i + 8]); - if (offset_count > (atom_size - 16) / 8) { - printf(" bad atom size/element count\n"); - goto error_out; - } - for (j = 0; j < offset_count; j++) { - current_offset = BE_64(&moov_atom[i + 12 + j * 8]); - current_offset += moov_atom_size; - moov_atom[i + 12 + j * 8 + 0] = (current_offset >> 56) & 0xFF; - moov_atom[i + 12 + j * 8 + 1] = (current_offset >> 48) & 0xFF; - moov_atom[i + 12 + j * 8 + 2] = (current_offset >> 40) & 0xFF; - moov_atom[i + 12 + j * 8 + 3] = (current_offset >> 32) & 0xFF; - moov_atom[i + 12 + j * 8 + 4] = (current_offset >> 24) & 0xFF; - moov_atom[i + 12 + j * 8 + 5] = (current_offset >> 16) & 0xFF; - moov_atom[i + 12 + j * 8 + 6] = (current_offset >> 8) & 0xFF; - moov_atom[i + 12 + j * 8 + 7] = (current_offset >> 0) & 0xFF; - } - i += atom_size - 4; - } + if (update_moov_atom(&moov_atom, &moov_atom_size) < 0) { + goto error_out; } /* re-open the input file and open the output file */ |