u32 gf_isom_fdm_get_data(GF_FileDataMap *ptr, char *buffer, u32 bufferLength, u64 fileOffset)
{
u32 bytesRead;
//can we seek till that point ???
if (fileOffset > gf_bs_get_size(ptr->bs)) return 0;
//ouch, we are not at the previous location, do a seek
if (ptr->curPos != fileOffset) {
if (gf_bs_seek(ptr->bs, fileOffset) != GF_OK) return 0;
ptr->curPos = fileOffset;
}
//read our data.
bytesRead = gf_bs_read_data(ptr->bs, buffer, bufferLength);
//update our cache
if (bytesRead == bufferLength) {
ptr->curPos += bytesRead;
} else {
gf_bs_get_refreshed_size(ptr->bs);
gf_bs_seek(ptr->bs, fileOffset);
bytesRead = gf_bs_read_data(ptr->bs, buffer, bufferLength);
//update our cache
if (bytesRead == bufferLength) {
ptr->curPos += bytesRead;
} else {
gf_bs_seek(ptr->bs, ptr->curPos);
bytesRead = 0;
}
}
ptr->last_acces_was_read = 1;
return bytesRead;
}
GF_Err Media_GetSample(GF_MediaBox *mdia, u32 sampleNumber, GF_ISOSample **samp, u32 *sIDX, Bool no_data, u64 *out_offset)
{
GF_Err e;
u32 bytesRead;
u32 dataRefIndex, chunkNumber;
u64 offset, new_size;
u8 isEdited;
GF_SampleEntryBox *entry;
if (!mdia || !mdia->information->sampleTable) return GF_BAD_PARAM;
//OK, here we go....
if (sampleNumber > mdia->information->sampleTable->SampleSize->sampleCount) return GF_BAD_PARAM;
//get the DTS
e = stbl_GetSampleDTS(mdia->information->sampleTable->TimeToSample, sampleNumber, &(*samp)->DTS);
if (e) return e;
//the CTS offset
if (mdia->information->sampleTable->CompositionOffset) {
e = stbl_GetSampleCTS(mdia->information->sampleTable->CompositionOffset , sampleNumber, &(*samp)->CTS_Offset);
if (e) return e;
} else {
(*samp)->CTS_Offset = 0;
}
//the size
e = stbl_GetSampleSize(mdia->information->sampleTable->SampleSize, sampleNumber, &(*samp)->dataLength);
if (e) return e;
//the RAP
if (mdia->information->sampleTable->SyncSample) {
e = stbl_GetSampleRAP(mdia->information->sampleTable->SyncSample, sampleNumber, &(*samp)->IsRAP, NULL, NULL);
if (e) return e;
} else {
//if no SyncSample, all samples are sync (cf spec)
(*samp)->IsRAP = 1;
}
/*overwrite sync sample with sample dep if any*/
if (mdia->information->sampleTable->SampleDep) {
u32 dependsOn, dependedOn, redundant;
e = stbl_GetSampleDepType(mdia->information->sampleTable->SampleDep, sampleNumber, &dependsOn, &dependedOn, &redundant);
if (!e) {
if (dependsOn==1) (*samp)->IsRAP = 0;
else if (dependsOn==2) (*samp)->IsRAP = 1;
/*if not depended upon and redundant, mark as carousel sample*/
if ((dependedOn==2) && (redundant==1)) (*samp)->IsRAP = 2;
/*TODO FIXME - we must enhance the IsRAP semantics to carry disposable info ... */
}
}
/*get sync shadow*/
if (Media_IsSampleSyncShadow(mdia->information->sampleTable->ShadowSync, sampleNumber)) (*samp)->IsRAP = 2;
//the data info
if (!sIDX && !no_data) return GF_BAD_PARAM;
if (!sIDX && !out_offset) return GF_OK;
(*sIDX) = 0;
e = stbl_GetSampleInfos(mdia->information->sampleTable, sampleNumber, &offset, &chunkNumber, sIDX, &isEdited);
if (e) return e;
//then get the DataRef
e = Media_GetSampleDesc(mdia, *sIDX, &entry, &dataRefIndex);
if (e) return e;
// Open the data handler - check our mode, don't reopen in read only if this is
//the same entry. In other modes we have no choice because the main data map is
//divided into the original and the edition files
if (mdia->mediaTrack->moov->mov->openMode == GF_ISOM_OPEN_READ) {
//same as last call in read mode
if (!mdia->information->dataHandler) {
e = gf_isom_datamap_open(mdia, dataRefIndex, isEdited);
if (e) return e;
}
if (mdia->information->dataEntryIndex != dataRefIndex)
mdia->information->dataEntryIndex = dataRefIndex;
} else {
e = gf_isom_datamap_open(mdia, dataRefIndex, isEdited);
if (e) return e;
}
if (out_offset) *out_offset = offset;
if (no_data) return GF_OK;
/*and finally get the data, include padding if needed*/
(*samp)->data = (char *) gf_malloc(sizeof(char) * ( (*samp)->dataLength + mdia->mediaTrack->padding_bytes) );
if (mdia->mediaTrack->padding_bytes)
memset((*samp)->data + (*samp)->dataLength, 0, sizeof(char) * mdia->mediaTrack->padding_bytes);
//check if we can get the sample (make sure we have enougth data...)
new_size = gf_bs_get_size(mdia->information->dataHandler->bs);
if (offset + (*samp)->dataLength > new_size) {
//always refresh the size to avoid wrong info on http/ftp
new_size = gf_bs_get_refreshed_size(mdia->information->dataHandler->bs);
if (offset + (*samp)->dataLength > new_size) {
mdia->BytesMissing = offset + (*samp)->dataLength - new_size;
return GF_ISOM_INCOMPLETE_FILE;
}
}
bytesRead = gf_isom_datamap_get_data(mdia->information->dataHandler, (*samp)->data, (*samp)->dataLength, offset);
//if bytesRead != sampleSize, we have an IO err
if (bytesRead < (*samp)->dataLength) {
return GF_IO_ERR;
}
mdia->BytesMissing = 0;
//finally rewrite the sample if this is an OD Access Unit
if (mdia->handler->handlerType == GF_ISOM_MEDIA_OD) {
e = Media_RewriteODFrame(mdia, *samp);
if (e) return e;
}
/*FIXME: we don NOT rewrite sample if we have a encrypted track*/
else if (gf_isom_is_nalu_based_entry(mdia, entry) &&
!gf_isom_is_track_encrypted(mdia->mediaTrack->moov->mov, gf_isom_get_tracknum_from_id(mdia->mediaTrack->moov, mdia->mediaTrack->Header->trackID))
) {
e = gf_isom_nalu_sample_rewrite(mdia, *samp, sampleNumber, (GF_MPEGVisualSampleEntryBox *)entry);
if (e) return e;
}
else if (mdia->mediaTrack->moov->mov->convert_streaming_text
&& ((mdia->handler->handlerType == GF_ISOM_MEDIA_TEXT) || (mdia->handler->handlerType == GF_ISOM_MEDIA_SUBT))
&& (entry->type == GF_ISOM_BOX_TYPE_TX3G || entry->type == GF_ISOM_BOX_TYPE_TEXT)
) {
u64 dur;
if (sampleNumber == mdia->information->sampleTable->SampleSize->sampleCount) {
dur = mdia->mediaHeader->duration - (*samp)->DTS;
} else {
stbl_GetSampleDTS(mdia->information->sampleTable->TimeToSample, sampleNumber+1, &dur);
dur -= (*samp)->DTS;
}
e = gf_isom_rewrite_text_sample(*samp, *sIDX, (u32) dur);
if (e) return e;
}
return GF_OK;
}
