isom_read.c

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

		if ( (*sample)->DTS > (u64) mediaOffset) {
			(*sample)->DTS -= (u64) mediaOffset;
		} else {
			(*sample)->DTS = 0;
		}
	}
	if (sampleNumber) *sampleNumber = sampNum;
	return GF_OK;
}



GF_EXPORT
u64 gf_isom_get_missing_bytes(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;

	return trak->Media->BytesMissing;
}

GF_EXPORT
GF_Err gf_isom_set_sample_padding(GF_ISOFile *the_file, u32 trackNumber, u32 padding_bytes)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return GF_BAD_PARAM;
	trak->padding_bytes = padding_bytes;
	return GF_OK;

}

//get the number of edited segment
GF_EXPORT
u32 gf_isom_get_edit_segment_count(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;

	if (!trak->editBox || !trak->editBox->editList) return 0;
	return gf_list_count(trak->editBox->editList->entryList);
}


//Get the desired segment information
GF_EXPORT
GF_Err gf_isom_get_edit_segment(GF_ISOFile *the_file, u32 trackNumber, u32 SegmentIndex, u64 *EditTime, u64 *SegmentDuration, u64 *MediaTime, u8 *EditMode)
{
	u32 i;
	u64 startTime;
	GF_TrackBox *trak;
	GF_EditListBox *elst;
	GF_EdtsEntry *ent;

	ent = NULL;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return GF_BAD_PARAM;

	if (!trak || !trak->editBox || 
		!trak->editBox->editList || 
		(SegmentIndex > gf_list_count(trak->editBox->editList->entryList)) || 
		!SegmentIndex)
		return GF_BAD_PARAM;

	elst = trak->editBox->editList;
	startTime = 0;

	for (i = 0; i < SegmentIndex; i++) {
		ent = (GF_EdtsEntry*)gf_list_get(elst->entryList, i);
		if (i < SegmentIndex-1) startTime += ent->segmentDuration;
	}
	*EditTime = startTime;
	*SegmentDuration = ent->segmentDuration;
	if (ent->mediaTime < 0) {
		*MediaTime = 0;
		*EditMode = GF_ISOM_EDIT_EMPTY;
		return GF_OK;
	}
	if (ent->mediaRate == 0) {
		*MediaTime = ent->mediaTime;
		*EditMode = GF_ISOM_EDIT_DWELL;
		return GF_OK;
	}
	*MediaTime = ent->mediaTime;
	*EditMode = GF_ISOM_EDIT_NORMAL;
	return GF_OK;
}

GF_EXPORT
u8 gf_isom_has_sync_points(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;

	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;
	if (trak->Media->information->sampleTable->SyncSample) {
		if (!trak->Media->information->sampleTable->SyncSample->entryCount) return 2;	
		return 1;
	}
	return 0;
}

/*returns number of sync points*/
GF_EXPORT
u32 gf_isom_get_sync_point_count(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;
	if (trak->Media->information->sampleTable->SyncSample) {
		return trak->Media->information->sampleTable->SyncSample->entryCount;	
	}
	return 0;
}


GF_EXPORT
GF_Err gf_isom_get_brand_info(GF_ISOFile *movie, u32 *brand, u32 *minorVersion, u32 *AlternateBrandsCount)
{
	if (!movie || !brand) return GF_BAD_PARAM;
	if (!movie->brand) {
		*brand = 0;
		if (minorVersion) *minorVersion = 0;
		if (AlternateBrandsCount) *AlternateBrandsCount = 0;
		return GF_OK;
	}

	*brand = movie->brand->majorBrand;
	if (minorVersion) *minorVersion = movie->brand->minorVersion;
	if (AlternateBrandsCount) *AlternateBrandsCount = movie->brand->altCount;
	return GF_OK;
}

GF_EXPORT
GF_Err gf_isom_get_alternate_brand(GF_ISOFile *movie, u32 BrandIndex, u32 *brand)
{
	if (!movie || !movie->brand || !brand) return GF_BAD_PARAM;
	if (BrandIndex > movie->brand->altCount || !BrandIndex) return GF_BAD_PARAM;
	*brand = movie->brand->altBrand[BrandIndex-1];
	return GF_OK;
}

GF_Err gf_isom_get_sample_padding_bits(GF_ISOFile *the_file, u32 trackNumber, u32 sampleNumber, u8 *NbBits)
{
	GF_TrackBox *trak;

	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return GF_BAD_PARAM;


	//Padding info
	return stbl_GetPaddingBits(trak->Media->information->sampleTable->PaddingBits, 
		sampleNumber, NbBits);

}


GF_EXPORT
Bool gf_isom_has_padding_bits(GF_ISOFile *the_file, u32 trackNumber)
{
	GF_TrackBox *trak;

	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;

	if (trak->Media->information->sampleTable->PaddingBits) return 1;
	return 0;
}


GF_EXPORT
u32 gf_isom_get_user_data_count(GF_ISOFile *movie, u32 trackNumber, u32 UserDataType, bin128 UUID)
{
	GF_UserDataMap *map;
	GF_TrackBox *trak;
	GF_UserDataBox *udta;
	bin128 t;
	u32 i, count;

	if (!movie || !movie->moov) return 0;
	
	if (UserDataType == GF_ISOM_BOX_TYPE_UUID) UserDataType = 0;
	memset(t, 1, 16);
	
	if (trackNumber) {
		trak = gf_isom_get_track_from_file(movie, trackNumber);
		if (!trak) return 0;
		udta = trak->udta;
	} else {
		udta = movie->moov->udta;
	}
	if (!udta) return 0;

	i=0;
	while ((map = (GF_UserDataMap*)gf_list_enum(udta->recordList, &i))) {
		count = gf_list_count(map->boxList);

		if ((map->boxType == GF_ISOM_BOX_TYPE_UUID) && !memcmp(map->uuid, UUID, 16)) return count;
		else if (map->boxType == UserDataType) return count;
	}
	return 0;
}

GF_EXPORT
GF_Err gf_isom_get_user_data(GF_ISOFile *movie, u32 trackNumber, u32 UserDataType, bin128 UUID, u32 UserDataIndex, char **userData, u32 *userDataSize)
{
	GF_UserDataMap *map;
	GF_UnknownBox *ptr;
	u32 i;
	bin128 t;
	GF_TrackBox *trak;
	GF_UserDataBox *udta;

	if (!movie || !movie->moov) return GF_BAD_PARAM;
	
	if (trackNumber) {
		trak = gf_isom_get_track_from_file(movie, trackNumber);
		if (!trak) return GF_BAD_PARAM;
		udta = trak->udta;
	} else {
		udta = movie->moov->udta;
	}
	if (!udta) return GF_BAD_PARAM;

	if (UserDataType == GF_ISOM_BOX_TYPE_UUID) UserDataType = 0;
	memset(t, 1, 16);

	if (!UserDataIndex) return GF_BAD_PARAM;
	if (!userData || !userDataSize || *userData) return GF_BAD_PARAM;

	i=0;
	while ((map = (GF_UserDataMap*)gf_list_enum(udta->recordList, &i))) {
		if ((map->boxType == GF_ISOM_BOX_TYPE_UUID) && !memcmp(map->uuid, UUID, 16)) goto found;
		else if (map->boxType == UserDataType) goto found;
	
	}
	return GF_BAD_PARAM;

found:

	if (UserDataIndex > gf_list_count(map->boxList) ) return GF_BAD_PARAM;
	ptr = (GF_UnknownBox*)gf_list_get(map->boxList, UserDataIndex-1);

	//ok alloc the data
	*userData = (char *)malloc(sizeof(char)*ptr->dataSize);
	if (!*userData) return GF_OUT_OF_MEM;
	memcpy(*userData, ptr->data, sizeof(char)*ptr->dataSize);
	*userDataSize = ptr->dataSize;	
	return GF_OK;
}

GF_EXPORT
void gf_isom_delete(GF_ISOFile *movie)
{
	//free and return;
	gf_isom_delete_movie(movie);
}

GF_EXPORT
u32 gf_isom_get_max_chunk_duration(GF_ISOFile *movie, u32 trackNumber)
{
	GF_TrackBox *trak;
	u32 i, sample_per_chunk, sample_dur;
	GF_SampleToChunkBox *stsc;
	GF_TimeToSampleBox *stts;
	GF_StscEntry *sc;
	GF_SttsEntry *ts;
	if (!movie || !trackNumber || !movie->moov) return 0;
	trak = gf_isom_get_track_from_file(movie, trackNumber);
	if (!trak) return 0;

	stsc = trak->Media->information->sampleTable->SampleToChunk;
	stts = trak->Media->information->sampleTable->TimeToSample;

	sample_per_chunk = 0;
	i=0;
	while ((sc = (GF_StscEntry *) gf_list_enum(stsc->entryList, &i))) {
		if (sc->samplesPerChunk > sample_per_chunk) sample_per_chunk = sc->samplesPerChunk;
	}
	sample_dur = 0;
	i=0;
	while ((ts = (GF_SttsEntry *)gf_list_enum(stts->entryList, &i))) {
		if (ts->sampleDelta > sample_dur) sample_dur = ts->sampleDelta;
	}
	
	//rescale to ms
	i = 1000 * sample_dur * sample_per_chunk / trak->Media->mediaHeader->timeScale;
	return i;
}

GF_EXPORT
u32 gf_isom_get_sample_fragment_count(GF_ISOFile *the_file, u32 trackNumber, u32 sampleNumber)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return 0;

	//Padding info
	return stbl_GetSampleFragmentCount(trak->Media->information->sampleTable->Fragments, sampleNumber);
}

GF_EXPORT
u16 gf_isom_get_sample_fragment_size(GF_ISOFile *the_file, u32 trackNumber, u32 sampleNumber, u32 FragmentIndex)
{
	GF_TrackBox *trak;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak || !FragmentIndex) return 0;

	//Padding info
	return stbl_GetSampleFragmentSize(trak->Media->information->sampleTable->Fragments, sampleNumber, FragmentIndex);
}


GF_EXPORT
GF_Err gf_isom_get_fragment_defaults(GF_ISOFile *the_file, u32 trackNumber, 
							 u32 *defaultDuration, u32 *defaultSize, u32 *defaultDescriptionIndex,
							 u32 *defaultRandomAccess, u8 *defaultPadding, u16 *defaultDegradationPriority)
{
	GF_TrackBox *trak;
	GF_SttsEntry *ts_ent;
	GF_StscEntry *sc_ent;
	u32 i, j, maxValue, value;
	GF_SampleTableBox *stbl;
	trak = gf_isom_get_track_from_file(the_file, trackNumber);
	if (!trak) return GF_BAD_PARAM;

	stbl = trak->Media->information->sampleTable;
	//duration
	if (defaultDuration) {
		maxValue = value = 0;
		i=0;
		while ((ts_ent = (GF_SttsEntry *)gf_list_enum(stbl->TimeToSample->entryList, &i))) {
			if (ts_ent->sampleCount>maxValue) {
				value = ts_ent->sampleDelta;
				maxValue = ts_ent->sampleCount;
			}
		}
		*defaultDuration = value;
	}
	//size
	if (defaultSize) {
		*defaultSize = stbl->SampleSize->sampleSize;
	}
	//descIndex
	if (defaultDescriptionIndex) {
		maxValue = value = 0;
		i=0;
		while ((sc_ent = (GF_StscEntry *)gf_list_enum(stbl->SampleToChunk->entryList, &i))) {
			if ((sc_ent->nextChunk - sc_ent->firstChunk) * sc_ent->samplesPerChunk > maxValue) {
				value = sc_ent->sampleDescriptionIndex;
				maxValue = (sc_ent->nextChunk - sc_ent->firstChunk) * sc_ent->samplesPerChunk;
			}
		}
		*defaultDescriptionIndex = value ? value : 1;
	}
	//RAP
	if (defaultRandomAccess) {
		//no sync table is ALL RAP
		*defaultRandomAccess = stbl->SyncSample ? 0 : 1;
		if (stbl->SyncSample 
			&& (stbl->SyncSample->entryCount >= stbl->SampleSize->sampleCount/2)) {
			*defaultRandomAccess = 1;
		}
	}
	//defaultPadding
	if (defaultPadding) {
		*defaultPadding = 0;
		if (stbl->PaddingBits) {
			maxValue = 0;
			for (i=0; i<stbl->PaddingBits->SampleCount; i++) {
				value = 0;
				for (j=0; j<stbl->PaddingBits->SampleCount; j++) {
					if (stbl->PaddingBits->padbits[i]==stbl->PaddingBits->padbits[j]) {
						value ++;
					}
				}
				if (value>maxValue) {
					maxValue = value;
					*defaultPadding = stbl->PaddingBits->padbits[i];
				}
			}
		}
	}
	//defaultDegradationPriority
	if (defaultDegradationPriority) {
		*defaultDegradationPriority = 0;
		if (stbl->DegradationPriority) {
			maxValue = 0;
			for (i=0; i<stbl->DegradationPriority->entryCount; i++) {
				value = 0;
				for (j=0; j<stbl->DegradationPriority->entryCount; j++) {
					if (stbl->DegradationPriority->priorities[i]==stbl->DegradationPriority->priorities[j]) {
						value ++;
					}
				}
				if (value>maxValue) {
					maxValue = value;
					*defaultDegradationPriority = stbl->DegradationPriority->priorities[i];
				}
			}
		}
	}
	return GF_OK;
}


GF_EXPORT
GF_Err gf_isom_refresh_fragmented(GF_ISOFile *movie, u64 *MissingBytes)
{
#ifdef	GF_ISOM_NO_FRAGMENTS
	return GF_NOT_SUPPORTED;
#else
	if (!movie || !movie->moov || !movie->moov->mvex) return GF_BAD_PARAM;
	if (movie->openMode != GF_ISOM_OPEN_READ) return GF_BAD_PARAM;

	//ok parse root boxes
	return gf_isom_parse_movie_boxes(movie, MissingBytes);
#endif
}


GF_EXPORT
GF_Err gf_isom_text_set_streaming_mode(GF_ISOFile *movie, Bool do_convert)
{
	if (!movie) return GF_BAD_PARAM;
	movie->convert_streaming_text = do_convert;
	return GF_OK;
}


GF_EXPORT
GF_GenericSampleDescription *gf_isom_get_generic_sample_description(GF_ISOFile *movie, u32 trackNumber, u32 StreamDescriptionIndex)
{
	GF_GenericVisualSampleEntryBox *entry;
	GF_GenericAudioSampleEntryBox *gena;
	GF_GenericSampleEntryBox *genm;
	GF_TrackBox *trak;
	GF_GenericSampleDescription *udesc;