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GPMF_mp4reader.c
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GPMF_mp4reader.c
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/*! @file mp4reader.c
*
* @brief Way Too Crude MP4|MOV reader
*
* @version 1.7.4
*
* (C) Copyright 2017-2020 GoPro Inc (http://gopro.com/).
*
* Licensed under either:
* - Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
* - MIT license, http://opensource.org/licenses/MIT
* at your option.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* This is not an elegant MP4 parser, only used to help demonstrate extraction of GPMF */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "GPMF_mp4reader.h"
#include "../GPMF_common.h"
#define PRINT_MP4_STRUCTURE 0
#ifdef _WINDOWS
#define LONGTELL _ftelli64
#else
#define LONGTELL ftell
#endif
uint32_t GetNumberPayloads(size_t handle)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4)
{
return mp4->indexcount;
}
return 0;
}
uint32_t *GetPayload(size_t handle, uint32_t *lastpayload, uint32_t index)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return NULL;
uint32_t *MP4buffer = NULL;
if (index < mp4->indexcount && mp4->mediafp)
{
if ((mp4->filesize >= mp4->metaoffsets[index]+mp4->metasizes[index]) && (mp4->metasizes[index] > 0))
{
MP4buffer = (uint32_t *)realloc((void *)lastpayload, mp4->metasizes[index]);
if (MP4buffer)
{
#ifdef _WINDOWS
_fseeki64(mp4->mediafp, (__int64) mp4->metaoffsets[index], SEEK_SET);
#else
fseeko(mp4->mediafp, (off_t) mp4->metaoffsets[index], SEEK_SET);
#endif
fread(MP4buffer, 1, mp4->metasizes[index], mp4->mediafp);
mp4->filepos = mp4->metaoffsets[index] + mp4->metasizes[index];
return MP4buffer;
}
}
}
if (lastpayload)
free(lastpayload);
return NULL;
}
uint32_t WritePayload(size_t handle, uint32_t *payload, uint32_t payloadsize, uint32_t index)
{
mp4object* mp4 = (mp4object*)handle;
if (mp4 == NULL) return 0;
if (index < mp4->indexcount && mp4->mediafp)
{
if ((mp4->filesize >= mp4->metaoffsets[index] + mp4->metasizes[index]) && mp4->metasizes[index] == payloadsize)
{
#ifdef _WINDOWS
_fseeki64(mp4->mediafp, (__int64)mp4->metaoffsets[index], SEEK_SET);
#else
fseeko(mp4->mediafp, (off_t)mp4->metaoffsets[index], SEEK_SET);
#endif
fwrite(payload, 1, payloadsize, mp4->mediafp);
mp4->filepos = mp4->metaoffsets[index] + payloadsize;
return payloadsize;
}
}
return 0;
}
void LongSeek(mp4object *mp4, int64_t offset)
{
if (mp4 && offset)
{
if (mp4->filepos + offset < mp4->filesize)
{
#ifdef _WINDOWS
_fseeki64(mp4->mediafp, (__int64)offset, SEEK_CUR);
#else
fseeko(mp4->mediafp, (off_t)offset, SEEK_CUR);
#endif
mp4->filepos += offset;
}
else
{
mp4->filepos = mp4->filesize;
}
}
}
void FreePayload(uint32_t *lastpayload)
{
if (lastpayload)
free(lastpayload);
}
uint32_t GetPayloadSize(size_t handle, uint32_t index)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return 0;
if (mp4->metasizes && mp4->metasize_count > index)
return mp4->metasizes[index] & (uint32_t)~0x3; //All GPMF payloads are 32-bit aligned and sized
return 0;
}
#define MAX_NEST_LEVEL 20
size_t OpenMP4Source(char *filename, uint32_t traktype, uint32_t traksubtype) //RAW or within MP4
{
mp4object *mp4 = (mp4object *)malloc(sizeof(mp4object));
if (mp4 == NULL) return 0;
memset(mp4, 0, sizeof(mp4object));
#ifdef _WINDOWS
struct _stat64 mp4stat;
_stat64(filename, &mp4stat);
#else
struct stat mp4stat;
stat(filename, &mp4stat);
#endif
mp4->filesize = (uint64_t) mp4stat.st_size;
// printf("filesize = %ld\n", mp4->filesize);
if (mp4->filesize < 64)
{
free(mp4);
return 0;
}
#ifdef _WINDOWS
fopen_s(&mp4->mediafp, filename, "rb+");
#else
mp4->mediafp = fopen(filename, "rb+");
#endif
if (mp4->mediafp)
{
uint32_t qttag, qtsize32, skip, type = 0, subtype = 0, num;
size_t len;
int32_t nest = 0;
uint64_t nestsize[MAX_NEST_LEVEL] = { 0 };
uint64_t lastsize = 0, qtsize;
do
{
len = fread(&qtsize32, 1, 4, mp4->mediafp);
len += fread(&qttag, 1, 4, mp4->mediafp);
mp4->filepos += len;
if (len == 8 && mp4->filepos < mp4->filesize)
{
if (mp4->filepos == 8 && qttag != MAKEID('f', 't', 'y', 'p'))
{
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
if (!GPMF_VALID_FOURCC(qttag))
{
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
qtsize32 = BYTESWAP32(qtsize32);
if (qtsize32 == 1) // 64-bit Atom
{
len = fread(&qtsize, 1, 8, mp4->mediafp);
mp4->filepos += len;
qtsize = BYTESWAP64(qtsize) - 8;
}
else
qtsize = qtsize32;
if(qtsize-len > (mp4->filesize - mp4->filepos)) // not parser truncated files.
{
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
nest++;
if (qtsize < 8) break;
if (nest >= MAX_NEST_LEVEL) break;
nestsize[nest] = qtsize;
lastsize = qtsize;
#if PRINT_MP4_STRUCTURE
for (int i = 1; i < nest; i++) printf(" ");
printf("%c%c%c%c (%lld)\n", (qttag & 0xff), ((qttag >> 8) & 0xff), ((qttag >> 16) & 0xff), ((qttag >> 24) & 0xff), qtsize);
if (qttag == MAKEID('m', 'd', 'a', 't') ||
qttag == MAKEID('f', 't', 'y', 'p') ||
qttag == MAKEID('u', 'd', 't', 'a') ||
qttag == MAKEID('f', 'r', 'e', 'e'))
{
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
continue;
}
#endif
if (qttag != MAKEID('m', 'o', 'o', 'v') && //skip over all but these atoms
qttag != MAKEID('m', 'v', 'h', 'd') &&
qttag != MAKEID('t', 'r', 'a', 'k') &&
qttag != MAKEID('m', 'd', 'i', 'a') &&
qttag != MAKEID('m', 'd', 'h', 'd') &&
qttag != MAKEID('m', 'i', 'n', 'f') &&
qttag != MAKEID('g', 'm', 'i', 'n') &&
qttag != MAKEID('d', 'i', 'n', 'f') &&
qttag != MAKEID('a', 'l', 'i', 's') &&
qttag != MAKEID('s', 't', 's', 'd') &&
qttag != MAKEID('s', 't', 'b', 'l') &&
qttag != MAKEID('s', 't', 't', 's') &&
qttag != MAKEID('s', 't', 's', 'c') &&
qttag != MAKEID('s', 't', 's', 'z') &&
qttag != MAKEID('s', 't', 'c', 'o') &&
qttag != MAKEID('c', 'o', '6', '4') &&
qttag != MAKEID('h', 'd', 'l', 'r') &&
qttag != MAKEID('e', 'd', 't', 's'))
{
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else
if (qttag == MAKEID('m', 'v', 'h', 'd')) //mvhd movie header
{
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&skip, 1, 4, mp4->mediafp);
len += fread(&skip, 1, 4, mp4->mediafp);
len += fread(&mp4->clockdemon, 1, 4, mp4->mediafp); mp4->clockdemon = BYTESWAP32(mp4->clockdemon);
len += fread(&mp4->clockcount, 1, 4, mp4->mediafp); mp4->clockcount = BYTESWAP32(mp4->clockcount);
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over mvhd
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('t', 'r', 'a', 'k')) //trak header
{
if (mp4->trak_num+1 < MAX_TRACKS)
mp4->trak_num++;
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('m', 'd', 'h', 'd')) //mdhd media header
{
media_header md;
len = fread(&md, 1, sizeof(md), mp4->mediafp);
if (len == sizeof(md))
{
md.creation_time = BYTESWAP32(md.creation_time);
md.modification_time = BYTESWAP32(md.modification_time);
md.time_scale = BYTESWAP32(md.time_scale);
md.duration = BYTESWAP32(md.duration);
mp4->trak_clockdemon = md.time_scale;
mp4->trak_clockcount = md.duration;
if (mp4->videolength == 0.0) // Get the video length from the first track
{
mp4->videolength = (float)((double)mp4->trak_clockcount / (double)mp4->trak_clockdemon);
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over mvhd
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('h', 'd', 'l', 'r')) //hldr
{
uint32_t temp;
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&skip, 1, 4, mp4->mediafp);
len += fread(&temp, 1, 4, mp4->mediafp); // type will be 'meta' for the correct trak.
if (temp != MAKEID('a', 'l', 'i', 's') && temp != MAKEID('u', 'r', 'l', ' '))
type = temp;
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over hldr
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('e', 'd', 't', 's')) //edit list
{
uint32_t elst,temp,readnum,i;
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&elst, 1, 4, mp4->mediafp);
if (elst == MAKEID('e', 'l', 's', 't'))
{
len += fread(&temp, 1, 4, mp4->mediafp);
if (temp == 0)
{
len += fread(&readnum, 1, 4, mp4->mediafp);
readnum = BYTESWAP32(readnum);
if (readnum <= ((qtsize - 8 - len) / 12))
{
int32_t segment_duration; //integer that specifies the duration of this edit segment in units of the movies time scale.
int32_t segment_mediaTime; //integer containing the starting time within the media of this edit segment(in media timescale units).If this field is set to 1, it is an empty edit.The last edit in a track should never be an empty edit.Any difference between the movies duration and the tracks duration is expressed as an implicit empty edit.
int32_t segment_mediaRate; //point number that specifies the relative rate at which to play the media corresponding to this edit segment.This rate value cannot be 0 or negative.
for (i = 0; i < readnum; i++)
{
len += fread(&segment_duration, 1, 4, mp4->mediafp);
len += fread(&segment_mediaTime, 1, 4, mp4->mediafp);
len += fread(&segment_mediaRate, 1, 4, mp4->mediafp);
segment_duration = BYTESWAP32(segment_duration); // in MP4 clock base
segment_mediaTime = BYTESWAP32(segment_mediaTime); // in trak clock base
segment_mediaRate = BYTESWAP32(segment_mediaRate); // Fixed-point 65536 = 1.0X
if (segment_mediaTime == -1) // the segment_duration for blanked time
mp4->trak_edit_list_offsets[mp4->trak_num] += segment_duration; //samples are delay, data starts after presentation time zero.
else if (i == 0) // If the first editlst starts after zero, the track is offset by this time (time before presentation time zero.)
mp4->trak_edit_list_offsets[mp4->trak_num] -= (int32_t)((double)segment_mediaTime/(double)mp4->trak_clockdemon*(double)mp4->clockdemon); //convert to MP4 clock base.
}
if (type == traktype) // GPMF metadata
{
mp4->metadataoffset_clockcount = mp4->trak_edit_list_offsets[mp4->trak_num]; //leave in MP4 clock base
}
}
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over edts
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('s', 't', 's', 'd')) //read the sample decription to determine the type of metadata
{
if (type == traktype) //like meta
{
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&skip, 1, 4, mp4->mediafp);
len += fread(&skip, 1, 4, mp4->mediafp);
len += fread(&subtype, 1, 4, mp4->mediafp); // type will be 'meta' for the correct trak.
if (len == 16)
{
if (subtype != traksubtype) // not MP4 metadata
{
type = 0; // MP4
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stsd
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('s', 't', 's', 'c')) // metadata stsc - offset chunks
{
if (type == traktype) // meta
{
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
if (num <= ((qtsize - 8 - len)/sizeof(SampleToChunk)))
{
mp4->metastsc_count = num;
if (mp4->metastsc)
{
free(mp4->metastsc);
mp4->metastsc = 0;
}
if (num > 0)
{
mp4->metastsc = (SampleToChunk *)malloc(num * sizeof(SampleToChunk));
if (mp4->metastsc)
{
len += fread(mp4->metastsc, 1, num * sizeof(SampleToChunk), mp4->mediafp);
do
{
num--;
mp4->metastsc[num].chunk_num = BYTESWAP32(mp4->metastsc[num].chunk_num);
mp4->metastsc[num].samples = BYTESWAP32(mp4->metastsc[num].samples);
mp4->metastsc[num].id = BYTESWAP32(mp4->metastsc[num].id);
} while (num > 0);
}
}
else
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stsx
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('s', 't', 's', 'z')) // metadata stsz - sizes
{
if (type == traktype) // meta
{
uint32_t equalsamplesize;
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&equalsamplesize, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
// if equalsamplesize != 0, it is the size of all the samples and the length should be 20 (size,fourcc,flags,samplesize,samplecount)
if ((num <= ((qtsize - 8 - len)/sizeof(uint32_t))) || (equalsamplesize != 0 && qtsize == 20))
{
mp4->metasize_count = num;
if (mp4->metasizes)
{
free(mp4->metasizes);
mp4->metasizes = 0;
}
if(num > 0)
{
mp4->metasizes = (uint32_t *)malloc(num * 4);
if (mp4->metasizes)
{
if (equalsamplesize == 0)
{
len += fread(mp4->metasizes, 1, num * 4, mp4->mediafp);
do
{
num--;
mp4->metasizes[num] = BYTESWAP32(mp4->metasizes[num]);
} while (num > 0);
}
else
{
equalsamplesize = BYTESWAP32(equalsamplesize);
do
{
num--;
mp4->metasizes[num] = equalsamplesize;
} while (num > 0);
}
}
}
else
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stsz
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('s', 't', 'c', 'o')) // metadata stco - offsets
{
if (type == traktype) // meta
{
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
if (num <= ((qtsize - 8 - len)/sizeof(uint32_t)))
{
mp4->metastco_count = num;
if (mp4->metastsc_count > 0 && num != mp4->metasize_count)
{
if (mp4->metaoffsets)
{
free(mp4->metaoffsets);
mp4->metaoffsets = 0;
}
if(num > 0)
{
mp4->metaoffsets = (uint64_t *)malloc(num * 8);
if (mp4->metaoffsets)
{
uint32_t *metaoffsets32 = NULL;
metaoffsets32 = (uint32_t *)malloc(num * 4);
if (metaoffsets32)
{
uint64_t fileoffset = 0;
int stsc_pos = 0;
int stco_pos = 0;
int repeat = 1;
len += fread(metaoffsets32, 1, num * 4, mp4->mediafp);
do
{
num--;
metaoffsets32[num] = BYTESWAP32(metaoffsets32[num]);
} while (num > 0);
mp4->metaoffsets[0] = fileoffset = metaoffsets32[stco_pos];
num = 1;
while (num < mp4->metastco_count)
{
if ((uint32_t)repeat == mp4->metastsc[stsc_pos].samples)
{
if ((uint32_t)stco_pos + 1 < mp4->metastco_count)
{
stco_pos++;
fileoffset = (uint64_t)metaoffsets32[stco_pos];
}
else
{
fileoffset += (uint64_t)mp4->metasizes[num - 1];
}
if ((uint32_t)stsc_pos + 1 < mp4->metastsc_count)
if (mp4->metastsc[stsc_pos + 1].chunk_num == (uint32_t)stco_pos + 1)
stsc_pos++;
repeat = 1;
}
else
{
fileoffset += (uint64_t)mp4->metasizes[num - 1];
repeat++;
}
mp4->metaoffsets[num] = fileoffset;
//int delta = metaoffsets[num] - metaoffsets[num - 1];
//printf("%3d:%08x, delta = %08x\n", num, (int)fileoffset, delta);
num++;
}
if (mp4->metastsc) free(mp4->metastsc);
mp4->metastsc = NULL;
mp4->metastsc_count = 0;
free(metaoffsets32);
}
}
}
else
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
}
else
{
if (mp4->metaoffsets)
{
free(mp4->metaoffsets);
mp4->metaoffsets = 0;
}
if (num > 0)
{
mp4->metaoffsets = (uint64_t *)malloc(num * 8);
if (mp4->metaoffsets)
{
uint32_t *metaoffsets32 = NULL;
metaoffsets32 = (uint32_t *)malloc(num * 4);
if (metaoffsets32)
{
size_t readlen = fread(metaoffsets32, 1, num * 4, mp4->mediafp);
len += readlen;
do
{
num--;
mp4->metaoffsets[num] = BYTESWAP32(metaoffsets32[num]);
} while (num > 0);
free(metaoffsets32);
}
}
}
else
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stco
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('c', 'o', '6', '4')) // metadata stco - offsets
{
if (type == traktype) // meta
{
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
if(num == 0)
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
if (num <= ((qtsize - 8 - len)/sizeof(uint64_t)))
{
mp4->metastco_count = num;
if (mp4->metastsc_count > 0 && num != mp4->metasize_count)
{
if (mp4->metaoffsets)
{
free(mp4->metaoffsets);
mp4->metaoffsets = 0;
}
if (mp4->metasize_count)
{
mp4->metaoffsets = (uint64_t *)malloc(mp4->metasize_count * 8);
if (mp4->metaoffsets)
{
uint64_t *metaoffsets64 = NULL;
metaoffsets64 = (uint64_t *)malloc(num * 8);
if (metaoffsets64)
{
uint64_t fileoffset = 0;
int stsc_pos = 0;
int stco_pos = 0;
len += fread(metaoffsets64, 1, num * 8, mp4->mediafp);
do
{
num--;
metaoffsets64[num] = BYTESWAP64(metaoffsets64[num]);
} while (num > 0);
fileoffset = metaoffsets64[0];
mp4->metaoffsets[0] = fileoffset;
//printf("%3d:%08x, delta = %08x\n", 0, (int)fileoffset, 0);
num = 1;
while (num < mp4->metasize_count)
{
if (num != mp4->metastsc[stsc_pos].chunk_num - 1 && 0 == (num - (mp4->metastsc[stsc_pos].chunk_num - 1)) % mp4->metastsc[stsc_pos].samples)
{
stco_pos++;
fileoffset = metaoffsets64[stco_pos];
}
else
{
fileoffset += (uint64_t)mp4->metasizes[num - 1];
}
mp4->metaoffsets[num] = fileoffset;
//int delta = metaoffsets[num] - metaoffsets[num - 1];
//printf("%3d:%08x, delta = %08x\n", num, (int)fileoffset, delta);
num++;
}
if (mp4->metastsc) free(mp4->metastsc);
mp4->metastsc = NULL;
mp4->metastsc_count = 0;
free(metaoffsets64);
}
}
}
else
{
//size of null
CloseSource((size_t)mp4);
mp4 = NULL;
break;
}
}
else
{
if (mp4->metaoffsets)
{
free(mp4->metaoffsets);
mp4->metaoffsets = 0;
}
mp4->metaoffsets = (uint64_t *)malloc(num * 8);
if (mp4->metaoffsets)
{
len += fread(mp4->metaoffsets, 1, num * 8, mp4->mediafp);
do
{
num--;
mp4->metaoffsets[num] = BYTESWAP64(mp4->metaoffsets[num]);
} while (num > 0);
}
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stco
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else if (qttag == MAKEID('s', 't', 't', 's')) // time to samples
{
if (type == MAKEID('v', 'i', 'd', 'e')) // video trak to get frame rate
{
uint32_t samples = 0;
uint32_t entries = 0;
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
if (num <= ((qtsize - 8 - len) / 8))
{
entries = num;
while (entries > 0)
{
uint32_t samplecount;
uint32_t duration;
len += fread(&samplecount, 1, 4, mp4->mediafp);
samplecount = BYTESWAP32(samplecount);
len += fread(&duration, 1, 4, mp4->mediafp);
duration = BYTESWAP32(duration);
samples += samplecount;
entries--;
if (mp4->video_framerate_numerator == 0)
{
mp4->video_framerate_numerator = mp4->trak_clockdemon;
mp4->video_framerate_denominator = duration;
}
}
mp4->video_frames = samples;
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stco
}
else
if (type == traktype) // meta
{
uint32_t totaldur = 0, samples = 0;
uint32_t entries = 0;
len = fread(&skip, 1, 4, mp4->mediafp);
len += fread(&num, 1, 4, mp4->mediafp);
num = BYTESWAP32(num);
if (num <= ((qtsize - 8 - len)/8))
{
entries = num;
mp4->meta_clockdemon = mp4->trak_clockdemon;
mp4->meta_clockcount = mp4->trak_clockcount;
while (entries > 0)
{
uint32_t samplecount;
uint32_t duration;
len += fread(&samplecount, 1, 4, mp4->mediafp);
samplecount = BYTESWAP32(samplecount);
len += fread(&duration, 1, 4, mp4->mediafp);
duration = BYTESWAP32(duration);
samples += samplecount;
entries--;
totaldur += duration;
mp4->metadatalength += (double)((double)samplecount * (double)duration / (double)mp4->meta_clockdemon);
if (samplecount > 1 || entries == 1)
mp4->basemetadataduration = mp4->metadatalength * (double)mp4->meta_clockdemon / (double)samples;
}
}
mp4->filepos += len;
LongSeek(mp4, qtsize - 8 - len); // skip over stco
}
else
LongSeek(mp4, qtsize - 8);
NESTSIZE(qtsize);
}
else
{
NESTSIZE(8);
}
}
else
{
break;
}
} while (len > 0);
if (mp4)
{
if (mp4->metasizes == NULL || mp4->metaoffsets == NULL)
{
CloseSource((size_t)mp4);
mp4 = NULL;
}
// set the numbers of payload with both size and offset
if (mp4 != NULL)
{
mp4->indexcount = mp4->metasize_count;
if (mp4->metastco_count < mp4->indexcount)
mp4->indexcount = mp4->metastco_count;
}
}
}
else
{
// printf("Could not open %s for input\n", filename);
// exit(1);
free(mp4);
mp4 = NULL;
}
return (size_t)mp4;
}
float GetDuration(size_t handle)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return 0.0;
return (float)mp4->metadatalength;
}
uint32_t GetVideoFrameRateAndCount(size_t handle, uint32_t *numer, uint32_t *demon)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return 0;
if (numer != NULL && demon != NULL && mp4->video_frames > 0)
{
*numer = mp4->video_framerate_numerator;
*demon = mp4->video_framerate_denominator;
return mp4->video_frames;
}
return 0;
}
void CloseSource(size_t handle)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL)
{
return;
}
if (mp4->mediafp)
{
fclose(mp4->mediafp);
mp4->mediafp = NULL;
}
if (mp4->metasizes)
{
free(mp4->metasizes);
mp4->metasizes = 0;
}
if (mp4->metaoffsets)
{
free(mp4->metaoffsets);
mp4->metaoffsets = 0;
}
if (mp4->metastsc)
{
free(mp4->metastsc);
mp4->metastsc = 0;
}
free(mp4);
}
uint32_t GetPayloadTime(size_t handle, uint32_t index, double *in, double *out)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return GPMF_ERROR_MEMORY;
if (mp4->metaoffsets == 0 || mp4->basemetadataduration == 0 || mp4->meta_clockdemon == 0 || in == NULL || out == NULL) return GPMF_ERROR_MEMORY;
*in = ((double)index * (double)mp4->basemetadataduration / (double)mp4->meta_clockdemon);
*out = ((double)(index + 1) * (double)mp4->basemetadataduration / (double)mp4->meta_clockdemon);
if (*out > (double)mp4->metadatalength)
*out = (double)mp4->metadatalength;
// Add any Edit List offset
*in += (double)mp4->metadataoffset_clockcount / (double)mp4->clockdemon;
*out += (double)mp4->metadataoffset_clockcount / (double)mp4->clockdemon;
return GPMF_OK;
}
uint32_t GetPayloadRationalTime(size_t handle, uint32_t index, int32_t *in_numerator, int32_t *out_numerator, uint32_t *denominator)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return GPMF_ERROR_MEMORY;
if (mp4->metaoffsets == 0 || mp4->basemetadataduration == 0 || mp4->meta_clockdemon == 0 || in_numerator == NULL || out_numerator == NULL) return GPMF_ERROR_MEMORY;
*in_numerator = (int32_t)(index * mp4->basemetadataduration);
*out_numerator = (int32_t)((index + 1) * mp4->basemetadataduration);
if (*out_numerator > (int32_t)((double)mp4->metadatalength*(double)mp4->meta_clockdemon))
*out_numerator = (int32_t)((double)mp4->metadatalength*(double)mp4->meta_clockdemon);
// Add any Edit List offset
*in_numerator += (int32_t)(((double)mp4->metadataoffset_clockcount / (double)mp4->clockdemon) * mp4->meta_clockdemon);
*out_numerator += (int32_t)(((double)mp4->metadataoffset_clockcount / (double)mp4->clockdemon) * mp4->meta_clockdemon);
*denominator = mp4->meta_clockdemon;
return GPMF_OK;
}
uint32_t GetEditListOffset(size_t handle, double *offset)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return GPMF_ERROR_MEMORY;
if (mp4->clockdemon == 0) return GPMF_ERROR_MEMORY;
*offset = (double)mp4->metadataoffset_clockcount / (double)mp4->clockdemon;
return GPMF_OK;
}
uint32_t GetEditListOffsetRationalTime(size_t handle, int32_t *offset_numerator, uint32_t *denominator)
{
mp4object *mp4 = (mp4object *)handle;
if (mp4 == NULL) return GPMF_ERROR_MEMORY;
if (mp4->clockdemon == 0) return GPMF_ERROR_MEMORY;
*offset_numerator = mp4->metadataoffset_clockcount;
*denominator = mp4->clockdemon;