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added support for partial bitstream decoding

This commit is contained in:
Chris Hafey 2020-05-19 17:35:17 +00:00 committed by Robert G. Jakabosky
parent 99d555c0f1
commit cf38618234
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GPG Key ID: 0C38AF433FE0B1C0
2 changed files with 33 additions and 6 deletions
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2
src/lib/openjp2/j2k.c
View File

@ -4966,7 +4966,7 @@ static OPJ_BOOL opj_j2k_read_sod(opj_j2k_t *p_j2k,
opj_stream_get_number_byte_left(p_stream)) {
opj_event_msg(p_manager, EVT_ERROR,
"Tile part length size inconsistent with stream length\n");
return OPJ_FALSE;
//return OPJ_FALSE;
}
if (p_j2k->m_specific_param.m_decoder.m_sot_length >
UINT_MAX - OPJ_COMMON_CBLK_DATA_EXTRA) {

37
src/lib/openjp2/t2.c
View File

@ -502,7 +502,6 @@ OPJ_BOOL opj_t2_decode_packets(opj_tcd_t* tcd,
l_current_pi->precno, l_current_pi->layno, skip_packet ? "skipped" : "kept");
*/
}
if (!skip_packet) {
l_nb_bytes_read = 0;
@ -1378,6 +1377,7 @@ static OPJ_BOOL opj_t2_read_packet_data(opj_t2_t* p_t2,
opj_tcd_cblk_dec_t* l_cblk = 00;
opj_tcd_resolution_t* l_res =
&p_tile->comps[p_pi->compno].resolutions[p_pi->resno];
OPJ_UINT32 partial_buffer = 0;
OPJ_ARG_NOT_USED(p_t2);
OPJ_ARG_NOT_USED(pack_info);
@ -1397,6 +1397,12 @@ static OPJ_BOOL opj_t2_read_packet_data(opj_t2_t* p_t2,
for (cblkno = 0; cblkno < l_nb_code_blocks; ++cblkno) {
opj_tcd_seg_t *l_seg = 00;
// if we have a partial data stream, set numchunks to zero
// since we have no data to actually decode.
if(partial_buffer) {
l_cblk->numchunks = 0;
}
if (!l_cblk->numnewpasses) {
/* nothing to do */
++l_cblk;
@ -1419,12 +1425,29 @@ static OPJ_BOOL opj_t2_read_packet_data(opj_t2_t* p_t2,
/* Check possible overflow (on l_current_data only, assumes input args already checked) then size */
if ((((OPJ_SIZE_T)l_current_data + (OPJ_SIZE_T)l_seg->newlen) <
(OPJ_SIZE_T)l_current_data) ||
(l_current_data + l_seg->newlen > p_src_data + p_max_length)) {
(l_current_data + l_seg->newlen > p_src_data + p_max_length) ||
(partial_buffer)) {
opj_event_msg(p_manager, EVT_ERROR,
"read: segment too long (%d) with max (%d) for codeblock %d (p=%d, b=%d, r=%d, c=%d)\n",
l_seg->newlen, p_max_length, cblkno, p_pi->precno, bandno, p_pi->resno,
p_pi->compno);
return OPJ_FALSE;
// NOTE - originall we would return OPJ_FALSE here when we encountered partial bitstream
//return OPJ_FALSE;
// skip this codeblock since it is a partial read
partial_buffer = 1;
l_cblk->numchunks = 0;
l_seg->numpasses += l_seg->numnewpasses;
l_cblk->numnewpasses -= l_seg->numnewpasses;
if (l_cblk->numnewpasses > 0) {
++l_seg;
++l_cblk->numsegs;
}
if(l_cblk->numnewpasses > 0) {
break;
}
continue;
}
#ifdef USE_JPWL
@ -1486,8 +1509,12 @@ static OPJ_BOOL opj_t2_read_packet_data(opj_t2_t* p_t2,
++l_band;
}
*(p_data_read) = (OPJ_UINT32)(l_current_data - p_src_data);
// return the number of bytes read
if(partial_buffer) {
*(p_data_read) = p_max_length;
} else {
*(p_data_read) = (OPJ_UINT32)(l_current_data - p_src_data);
}
return OPJ_TRUE;
}