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movdata.c
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movdata.c
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// movdata module
//
// License terms defined in License.txt.
//
// This module implements a self contained Quicktime MOV file parser
// with verification that the MOV contains only a single Animation video track.
// This file should be #included into an implementation main file
// so that inline functions are seen as being in the same module.
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <math.h>
#include <assert.h>
#include <limits.h>
#include <unistd.h>
#include "movdata.h"
#pragma clang diagnostic ignored "-Wmissing-prototypes"
// Don't bother generating a compile time error if -mno-thumb is not specified for this
// specific module. There is a performance improvement if -mno-thumb is set, but it
// is not worth the trouble of setting target specific flags in newer versions of xcode.
// Older versions that build with gcc will continue to generate the error.
#if defined(__arm__)
# define COMPILE_ARM 1
# if defined(__thumb__)
# define COMPILE_ARM_THUMB_ASM 1
# else
# define COMPILE_ARM_ASM 1
# endif
#endif
#if defined(__clang__)
# define COMPILE_CLANG 1
#endif // defined(__clang__)
#if defined(COMPILE_ARM_THUMB_ASM) && !defined(COMPILE_CLANG)
#error "Module should not be compiled in Thumb mode, enable ARM mode by adding -mno-thumb to file specific target flags"
#endif
// Chunks of data contain 1 to N samples and are stored in mdat.
// The chunk contains an array of sample pointers and the
// offset in the file where the chunk begins.
typedef struct MovChunk {
uint32_t numSamples;
MovSample **samples;
uint32_t offset;
} MovChunk;
// The chunk table can't be processed until after the
// total number of chunks is known. Save it until
// after the chunk offset list has been processed.
typedef struct SampleToChunkTableEntry {
uint32_t first_chunk_id, samples_per_chunk;
} SampleToChunkTableEntry;
static inline
void movchunk_init(MovChunk *movChunk) {
bzero(movChunk, sizeof(MovChunk));
}
static inline
void movchunk_free(MovChunk *movChunk) {
if (movChunk->samples) {
free(movChunk->samples);
}
bzero(movChunk, sizeof(MovChunk));
}
static
inline
void movsample_setkeyframe(MovSample *movSample) {
movSample->lengthAndFlags |= (0x1 << 24);
}
void movdata_init(MovData *movData) {
bzero(movData, sizeof(MovData));
}
void movdata_free(MovData *movData) {
if (movData->frames) {
free(movData->frames);
}
if (movData->samples) {
free(movData->samples);
}
bzero(movData, sizeof(MovData));
}
// errCode values
#define ERR_READ 1
#define ERR_UNSUPPORTED_64BIT_FIELD 2
#define ERR_INVALID_FIELD 3
#define ERR_MALLOC_FAILED 4
typedef struct Atom {
uint32_t asize;
uint32_t atype;
} Atom;
typedef struct DataRefTableEntry
{
uint32_t size;
uint32_t type;
uint8_t version;
uint32_t flags;
uint32_t data_offset;
uint32_t data_size;
} DataRefTableEntry;
static inline char *
moviedata_fcc_tostring(MovData *movData, uint32_t num)
{
movData->fccbuffer[0] = ((char) (num & 0xFF)),
movData->fccbuffer[1] = ((char) ((num >> 8) & 0xFF)),
movData->fccbuffer[2] = ((char) ((num >> 16) & 0xFF)),
movData->fccbuffer[3] = ((char) ((num >> 24) & 0xFF)),
movData->fccbuffer[4] = '\0';
return movData->fccbuffer;
}
static inline int
fcc_toint(uint32_t a, uint32_t b, uint32_t c, uint32_t d)
{
return ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24));
}
// read an unsigned 32 bit number in big endian format, returns 0 on success.
static inline int
read_be_uint32(FILE *fp, uint32_t *ptr)
{
uint32_t lv;
if (fread(&lv, sizeof(lv), 1, fp) != 1) {
return 1;
}
*ptr = ntohl(lv);
return 0;
}
// read an unsigned 16 bit number in big endian format, returns 0 on success.
static inline int
read_be_uint16(FILE *fp, uint16_t *ptr)
{
uint16_t lv;
if (fread(&lv, sizeof(lv), 1, fp) != 1) {
return 1;
}
*ptr = ntohs(lv);
return 0;
}
// read a signed 16 bit number in big endian format, returns 0 on success.
static inline int
read_be_int16(FILE *fp, int16_t *ptr)
{
int16_t lv;
if (fread(&lv, sizeof(lv), 1, fp) != 1) {
return 1;
}
*ptr = ntohs(lv);
return 0;
}
// read an unsigned 32 bit number, returns 0 on success.
static inline int
read_uint32(FILE *fp, uint32_t *ptr)
{
uint32_t lv;
if (fread(&lv, sizeof(lv), 1, fp) != 1) {
return 1;
}
*ptr = lv;
return 0;
}
// read a quicktime floating point format number, returns 0 on success
static inline int
read_fixed32(FILE *fp, float *ptr)
{
char bytes[4];
uint8_t b1, b2, b3, b4;
uint32_t r1, r2;
if (fread(bytes, sizeof(bytes), 1, fp) != 1) {
return 1;
}
b1 = bytes[0];
b2 = bytes[1];
b3 = bytes[2];
b4 = bytes[3];
r1 = (b1 << 8) | b2;
r2 = (b3 << 8) | b4;
if (r2 == 0) {
*ptr = r1;
} else {
*ptr = b1 + (b2 / 65536.0);
}
return 0;
}
static
void init_alphaTables();
// recurse into atoms and process them. Return 0 on success
// otherwise non-zero to indicate an error.
uint32_t
process_atoms(FILE *movFile, MovData *movData, uint32_t maxOffset)
{
init_alphaTables();
// first 4 bytes indicate the size of the atom
Atom atom;
int seek_status;
while (1) {
uint32_t atomOffset = (uint32_t) ftell(movFile);
if (atomOffset >= maxOffset || feof(movFile)) {
// Done reading from atom at this point
break;
}
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "read atom at byte %d\n", (int) atomOffset);
#endif
if (read_be_uint32(movFile, &atom.asize) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for atom size");
return 1;
}
if (atom.asize == 0x00000001) {
movData->errCode = ERR_UNSUPPORTED_64BIT_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "64 bit atoms not supported");
return 1;
}
// an atom with zero size means the atom extends to the end
// of the file.
if (atom.asize == 0) {
break;
}
uint32_t atomMaxOffset = atomOffset + atom.asize;
// If the atom size is larger than the file size, then
// this can't be a valid quicktime file.
if (atomMaxOffset > maxOffset) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"invalid atom size not supported (%d + %d) > %d",
(int)atomOffset, (int)atom.asize, (int)maxOffset);
return 1;
}
// Read the "type" as a series of bytes, not a big endian number!
if (read_uint32(movFile, &atom.atype) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for atom type");
return 1;
}
// FIXME: Read the data for this specific Atom with one read operation, then parse
// using the data in the pointer. This is easier than doing feek type operations
// each time? Also, less can go wrong since IO handling is in one place. Note, that
// this read should not be done for a mdat atom because it is really large! Might
// also be good to just memory map the entire file at the start, and then use
// a pointer into that memory instead of messing about with specific reads and such.
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "type \"%s\", size %d\n", moviedata_fcc_tostring(movData, atom.atype), atom.asize);
#endif
if (atom.atype == fcc_toint('s', 't', 'b', 'l')) {
atom.asize = -(-atom.asize);
}
if (atom.atype == fcc_toint('f', 't', 'y', 'p')) {
// FILE TYPE : http://ftyps.com/
// Major Brand (ftyp code)
// Major Brand version
// Compatible Brand (ftyp code)
// Compatible Brand 2...N
uint32_t brand;
if (read_uint32(movFile, &brand) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for atom ftyp brand");
return 1;
}
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "ftyp brand \"%s\"\n", moviedata_fcc_tostring(movData, brand));
#endif
// FIXME: Fail to load if this does not match "qt " ???
} else if (atom.atype == fcc_toint('m', 'd', 'a', 't')) {
// Movie Data container : mdat
if (movData->foundMDAT) {
// Only a single mdat is supported
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"movie can't contain more than 1 movie data field");
return 1;
}
movData->rleDataOffset = (uint32_t) ftell(movFile);
movData->rleDataLength = atom.asize - 8;
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "mdat rle data at offset %d, size is %d bytes\n", movData->rleDataOffset, movData->rleDataLength);
#endif
movData->foundMDAT = 1;
} else if (atom.atype == fcc_toint('m', 'o', 'o', 'v')) {
// Movie container : toplevel
// moov atom contains children mvhd and trak
if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
} else if (atom.atype == fcc_toint('m', 'd', 'a', 't')) {
// media data atom : skip
} else if (atom.atype == fcc_toint('m', 'v', 'h', 'd')) {
// Movie header : moov.mvhd
// version : byte
char version;
if (fread(&version, sizeof(version), 1, movFile) != 1) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for mvhd version");
return 1;
}
if (version == 1) {
movData->errCode = ERR_UNSUPPORTED_64BIT_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "64 bit fields in mvhd not supported");
return 1;
}
// flags : 3 bytes
// creation time : 4 bytes
// modification time : 4 bytes
// time scale : 4 bytes
// duration : 4 bytes
// ...
seek_status = fseek(movFile, 3 + 4 + 4, SEEK_CUR);
assert(seek_status == 0);
uint32_t time_scale;
if (read_be_uint32(movFile, &time_scale) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for mvhd time_scale");
return 1;
}
uint32_t duration;
if (read_be_uint32(movFile, &duration) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for mvhd duration");
return 1;
}
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "mvhd time_scale %d, duration %d\n", time_scale, duration);
#endif
// The time scale is the number of time units per second.
// So, if there are 60 "ticks" in a second then the time scale is 60.
// The default time scale is 600, meaning 1/600 of a second.
movData->lengthInSeconds = ((float)duration) / time_scale;
movData->lengthInTicks = duration;
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "mvhd lengthInSeconds %f\n", movData->lengthInSeconds);
#endif
movData->timeScale = time_scale;
movData->foundMVHD = 1;
} else if (atom.atype == fcc_toint('t', 'r', 'a', 'k')) {
// Track container : moov.trak
if (movData->foundTRAK) {
// A movie with multiple tracks is not supported
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"movie can't contain more than 1 track");
return 1;
} else if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
movData->foundTRAK = 1;
} else if (atom.atype == fcc_toint('t', 'k', 'h', 'd')) {
// Track header : moov.trak.tkhd
// version : byte
// flags : 3 bytes
// creation time : 4 bytes
// modification time : 4 bytes
// track id : 4 bytes
// reserved : 4 bytes
// duration : 4 bytes
// reserved : 8 bytes
// layer : 2 bytes
// alt group : 2 bytes
// volume : 2 bytes
// reserved : 2 bytes
// matrix : 9 * 4 bytes
// track width : 4 bytes
// track height : 4 bytes
// skip ahead to the track id field
fseek(movFile, (1 + 3 + 4 + 4), SEEK_CUR);
uint32_t track_id;
if (read_be_uint32(movFile, &track_id) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for trak id");
return 1;
}
// track id must be 1, can't be 0 or more than 1 track
if (track_id != 1) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"invalid track id %d, only a single video track is supported", track_id);
return 1;
}
fseek(movFile, (4 + 4 + 8 + 2 + 2 + 2 + 2 + 9*4), SEEK_CUR);
float width;
if (read_fixed32(movFile, &width) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for trak track width");
return 1;
}
float height;
if (read_fixed32(movFile, &height) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for trak track height");
return 1;
}
// If width and height are zero, this must be an audio track
if (width == 0.0 && height == 0.0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"invalid track width/height of zero, mov can only contain a single video track");
return 1;
}
// width and height must be whole numbers as they will be converted to int.
// Also check for a common sense upper limit on the encoded movie size, 2000x2000 is huge.
if (width <= 0.0 || height <= 0.0 || floor(width) != width || floor(height) != height || width > 2000.0 || height > 2000.0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"invalid track width/height (%f / %f)",
width, height);
return 1;
}
movData->foundTKHD = 1;
movData->width = (int) width;
movData->height = (int) height;
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "tkhd width / height %d / %d\n", movData->width, movData->height);
#endif
} else if (atom.atype == fcc_toint('e', 'd', 't', 's')) {
// Edit container : moov.trak.edts
if (movData->foundEDTS) {
// Ignore any edit lists other than the first one
} else if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
movData->foundEDTS = 1;
} else if (atom.atype == fcc_toint('e', 'l', 's', 't')) {
// Edit list : moov.trak.elst
// version : byte
// flags : 3 bytes
// num entries : 4 bytes
// table : 12 bytes * num entries
// (track duration, media time, media rate)
// track duration : 4 byte integer
// media time : 4 byte integer
// media rate : 4 byte integer
// skip version and flags
fseek(movFile, 4, SEEK_CUR);
uint32_t num_entries;
if (read_be_uint32(movFile, &num_entries) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for elst num entries");
return 1;
}
// The track can only appear on the timeline once, at time = 0.0 to end
if (num_entries != 1) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "elst must contain only a single entry");
return 1;
}
uint32_t track_duration, media_time;
float media_rate;
if (read_be_uint32(movFile, &track_duration) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for elst track duration");
return 1;
}
if (read_be_uint32(movFile, &media_time) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for elst media time");
return 1;
}
if (read_fixed32(movFile, &media_rate) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for elst media rate");
return 1;
}
if (track_duration != movData->lengthInTicks) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "elst track duration %d does not match mov duration %d", track_duration, movData->lengthInTicks);
return 1;
}
if (media_time != 0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "elst track media time must begin at 0, not %d", media_time);
return 1;
}
if (media_rate != 1.0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "elst track media rate must be 1.0, not %d", media_time);
return 1;
}
movData->foundELST = 1;
} else if (atom.atype == fcc_toint('m', 'd', 'i', 'a')) {
// Media container : moov.trak.mdia
if (movData->foundMDIA) {
// Ignore any media segments other than the first one
} else if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
movData->foundMDIA = 1;
} else if (atom.atype == fcc_toint('m', 'd', 'h', 'd')) {
// Media header : moov.trak.mdia.mdhd
} else if (atom.atype == fcc_toint('h', 'd', 'l', 'r')) {
// Handler Reference Atom : moov.trak.mdia.hdlr
// Must contain [mhlr/vide - Apple Video Media Handler]
// version : byte
// flags : 3 bytes
// component type : 4 bytes
// component subtype : 4 bytes
// component manufacturer : 4 bytes
// component name : N bytes (ignored)
fseek(movFile, 4, SEEK_CUR);
uint32_t component_type;
if (read_uint32(movFile, &component_type) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for hdlr component type");
return 1;
}
uint32_t component_subtype;
if (read_uint32(movFile, &component_subtype) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for hdlr component subtype");
return 1;
}
uint32_t component_manufacturer;
if (read_uint32(movFile, &component_manufacturer) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for hdlr component manufacturer");
return 1;
}
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "component type \"%s\"\n", moviedata_fcc_tostring(movData, component_type));
fprintf(stdout, "component subtype \"%s\"\n", moviedata_fcc_tostring(movData, component_subtype));
fprintf(stdout, "component manufacturer \"%s\"\n", moviedata_fcc_tostring(movData, component_manufacturer));
#endif
if (component_type == fcc_toint('m', 'h', 'l', 'r')) {
// Defines an alias to the data handler
if (component_subtype != fcc_toint('v', 'i', 'd', 'e')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "hdlr component subtype is not vide");
return 1;
}
if (component_manufacturer != fcc_toint('a', 'p', 'p', 'l')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "hdlr component manufacturer is not appl");
return 1;
}
movData->foundMHLR = 1;
} else if (component_type == fcc_toint('d', 'h', 'l', 'r')) {
// Defines the handler in the minf atom (aliased to)
if (component_subtype != fcc_toint('a', 'l', 'i', 's')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "dhlr component subtype is not alis");
return 1;
}
if (component_manufacturer != fcc_toint('a', 'p', 'p', 'l')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "dhlr component manufacturer is not appl");
return 1;
}
movData->foundDHLR = 1;
} else {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "hdlr component type is not mhlr or dhlr");
return 1;
}
} else if (atom.atype == fcc_toint('m', 'i', 'n', 'f')) {
// Sound Media container : moov.trak.mdia.minf
if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
} else if (atom.atype == fcc_toint('d', 'i', 'n', 'f')) {
// Data Information container : moov.trak.mdia.minf.dinf
if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
} else if (atom.atype == fcc_toint('v', 'm', 'h', 'd')) {
// Video media information header : moov.trak.mdia.minf.vmhd
movData->foundVMHD = 1;
// version : byte
// flags : 3 bytes
// graphics mode : 2 bytes
// op color : 6 bytes
// skip version + flags
fseek(movFile, 4, SEEK_CUR);
// Read 16 bit graphics mode flag and support only simple ones
uint16_t graphics_mode;
if (read_be_uint16(movFile, &graphics_mode) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for vmhd graphics mode");
return 1;
}
// Can't validate graphics mode until bit depth is known
movData->graphicsMode = graphics_mode;
} else if (atom.atype == fcc_toint('d', 'r', 'e', 'f')) {
// Data reference: moov.trak.mdia.minf.dinf.dref
// version : byte
// flags : 3 bytes
// num entries : 4 bytes
fseek(movFile, 4, SEEK_CUR);
uint32_t num_entries;
if (read_be_uint32(movFile, &num_entries) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for dref num entres");
return 1;
}
// FIXME: seems like none of this is actually needed!
// Is it possible to just avoid parsing the dref completely?
// FIXME : Can there only be 1 entry in this data ref table?
// what happens if there are zero entries?
// Now there are num_entries number of data references to read
DataRefTableEntry *table = malloc(sizeof(DataRefTableEntry) * num_entries);
if (table == NULL) {
movData->errCode = ERR_MALLOC_FAILED;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"malloc of %d bytes failed for dref table", (int) (sizeof(DataRefTableEntry) * num_entries));
return 1;
}
bzero(table, sizeof(DataRefTableEntry) * num_entries);
for (int i = 0; i < num_entries; i++) {
DataRefTableEntry *entry = &table[i];
// size : 4 bytes
// type : 4 bytes
// version : 1 byte
// flags : 3 bytes
if (read_be_uint32(movFile, &entry->size) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for dref table entry size");
free(table);
return 1;
}
if (read_uint32(movFile, &entry->type) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for dref table entry type");
free(table);
return 1;
}
// type must be 'dref' ?
// Skip version and flags
fseek(movFile, 4, SEEK_CUR);
// Record location of data along with the number of bytes.
// We don't want to actually read the data since there could
// be a lot of data.
entry->data_offset = (uint32_t) ftell(movFile);
entry->data_size = entry->size - (4 + 4 + 1 + 3);
#ifdef DUMP_WHILE_PARSING
fprintf(stdout, "data ref %d, size %d, type \"%s\", data at %d of length %d\n", i,
entry->size, moviedata_fcc_tostring(movData, entry->type),
entry->data_offset, entry->data_size);
#endif
}
free(table);
movData->foundDREF = 1;
} else if (atom.atype == fcc_toint('s', 't', 'b', 'l')) {
// Sample table container : moov.trak.mdia.minf.stbl
// Contains the atoms that contain the actual video data to be decoded
if (movData->foundSTBL) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "found multiple stbl atoms");
return 1;
}
movData->foundSTBL = 1;
if (process_atoms(movFile, movData, atomMaxOffset) != 0) {
return 1;
}
} else if (atom.atype == fcc_toint('s', 't', 's', 'd')) {
// Sample description : moov.trak.mdia.minf.stbl.stsd
// Describes the format of the RLE data that appears in the mdat
if (movData->foundSTSD) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "found multiple stsd atoms");
return 1;
}
movData->foundSTSD = 1;
// version : byte
// flags : 3 bytes
// num entries : 4 bytes
fseek(movFile, 4, SEEK_CUR);
uint32_t num_entries;
if (read_be_uint32(movFile, &num_entries) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd num entres");
return 1;
}
if (num_entries != 1) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg),
"stsd table must contain 1 entry, not %d entries", (int) num_entries);
return 1;
}
// Read a single "Sample Description" data field
// Sample description size : 4 bytes
// Data format : 4 bytes
// Reserved : 6 bytes
// Data reference index : 2 bytes (16 bit integer index)
uint32_t sample_description_size, data_format;
if (read_be_uint32(movFile, &sample_description_size) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd sample description size");
return 1;
}
if (read_uint32(movFile, &data_format) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd sample data format");
return 1;
}
// Only "Animation" codec is supported
if (data_format != fcc_toint('r', 'l', 'e', ' ')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data format must be \"rle \" not \"%s\"",
moviedata_fcc_tostring(movData, data_format));
return 1;
}
// skip reserved
fseek(movFile, 6, SEEK_CUR);
uint32_t data_ref_size = sample_description_size - (4 + 4 + 6 + 2);
if (data_ref_size == 0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data ref size is zero");
return 1;
}
uint16_t data_ref_index;
if (read_be_uint16(movFile, &data_ref_index) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd sample data ref index");
return 1;
}
// Indicates that rle data is contained in the first (and only) mdat
if (data_ref_index != 1) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data ref index must be 1");
return 1;
}
// Additional fields for video sample description
// version : 2 bytes
// revision : 2 bytes
// vendor : 4 bytes
// temporal quality : 4 bytes
// spatial quality : 4 bytes
// width : 2 bytes
// height : 2 bytes
// horizontal resolution : 4 bytes (fixed)
// vertical resolution : 4 bytes (fixed)
// data size : 4 bytes
// frame count : 2 bytes
// compressor name : 32 byte string
// depth : 2 bytes
// color table id : 2 bytes
// skip version and revision
fseek(movFile, 2 + 2, SEEK_CUR);
uint32_t vendor;
if (read_uint32(movFile, &vendor) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd vendor");
return 1;
}
// Only Apple "Animation" codec is supported
if (vendor != fcc_toint('a', 'p', 'p', 'l')) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data format must be \"appl\" not \"%s\"",
moviedata_fcc_tostring(movData, vendor));
return 1;
}
// FIXME: check the return result of all of the fseek() calls!
// skip to frame count field
fseek(movFile, 4 + 4 + 2 + 2 + 4 + 4 + 4, SEEK_CUR);
// Verify that movie format stores only 1 frame in each sample.
uint16_t frame_count;
if (read_be_uint16(movFile, &frame_count) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd frame count");
return 1;
}
if (frame_count != 1) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table frame count must be 1, not %d", (int)frame_count);
return 1;
}
uint8_t compressor_name_len;
char compressor_name[31];
if (fread(&compressor_name_len, sizeof(compressor_name_len), 1, movFile) != 1) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd compressor name len");
return 1;
}
if (fread(&compressor_name[0], sizeof(compressor_name), 1, movFile) != 1) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd compressor name");
return 1;
}
compressor_name[30] = '\0';
char *animation_name = "Animation";
if (compressor_name_len != strlen(animation_name) || strcmp(compressor_name, animation_name) != 0) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data compressor name must be \"Animation\" not \"%s\"",
compressor_name);
return 1;
}
// depth == 16 | 24 | 32
uint16_t depth;
if (read_be_uint16(movFile, &depth) != 0) {
movData->errCode = ERR_READ;
snprintf(movData->errMsg, sizeof(movData->errMsg), "read error for stsd depth");
return 1;
}
if (depth != 16 && depth != 24 && depth != 32) {
movData->errCode = ERR_INVALID_FIELD;
snprintf(movData->errMsg, sizeof(movData->errMsg), "stsd table data ref index must be 16, 24, or 32. Not %d", (int)depth);
return 1;
}
movData->bitDepth = depth;
// color table id == -1
int16_t color_table_id;