}
}
-opj_image_t* j2k_decode(opj_j2k_t *j2k, opj_cio_t *cio, opj_codestream_info_t *cstr_info) {
- opj_image_t *image = NULL;
-
- opj_common_ptr cinfo = j2k->cinfo;
-
- j2k->cio = cio;
- j2k->cstr_info = cstr_info;
- if (cstr_info)
- memset(cstr_info, 0, sizeof(opj_codestream_info_t));
-
- /* create an empty image */
- image = opj_image_create0();
- j2k->image = image;
-
- j2k->state = J2K_STATE_MHSOC;
-
- for (;;) {
- opj_dec_mstabent_t *e;
- int id = cio_read(cio, 2);
-
-#ifdef USE_JPWL
- /* we try to honor JPWL correction power */
- if (j2k->cp->correct) {
- int orig_pos = cio_tell(cio);
- opj_bool status;
-
- /* call the corrector */
- status = jpwl_correct(j2k);
-
- /* go back to where you were */
- cio_seek(cio, orig_pos - 2);
-
- /* re-read the marker */
- id = cio_read(cio, 2);
-
- /* check whether it begins with ff */
- if (id >> 8 != 0xff) {
- opj_event_msg(cinfo, EVT_ERROR,
- "JPWL: possible bad marker %x at %d\n",
- id, cio_tell(cio) - 2);
- if (!JPWL_ASSUME) {
- opj_image_destroy(image);
- opj_event_msg(cinfo, EVT_ERROR, "JPWL: giving up\n");
- return 0;
- }
- /* we try to correct */
- id = id | 0xff00;
- cio_seek(cio, cio_tell(cio) - 2);
- cio_write(cio, id, 2);
- opj_event_msg(cinfo, EVT_WARNING, "- trying to adjust this\n"
- "- setting marker to %x\n",
- id);
- }
-
- }
-#endif /* USE_JPWL */
-
- if (id >> 8 != 0xff) {
- opj_image_destroy(image);
- opj_event_msg(cinfo, EVT_ERROR, "%.8x: expected a marker instead of %x\n", cio_tell(cio) - 2, id);
- return 0;
- }
- e = j2k_dec_mstab_lookup(id);
- /* Check if the marker is known*/
- if (!(j2k->state & e->states)) {
- opj_image_destroy(image);
- opj_event_msg(cinfo, EVT_ERROR, "%.8x: unexpected marker %x\n", cio_tell(cio) - 2, id);
- return 0;
- }
- /* Check if the decoding is limited to the main header*/
- if (e->id == J2K_MS_SOT && j2k->cp->limit_decoding == LIMIT_TO_MAIN_HEADER) {
- opj_event_msg(cinfo, EVT_INFO, "Main Header decoded.\n");
- return image;
- }
-
- if (e->handler) {
- (*e->handler)(j2k);
- }
- if (j2k->state & J2K_STATE_ERR)
- return NULL;
-
- if (j2k->state == J2K_STATE_MT) {
- break;
- }
- if (j2k->state == J2K_STATE_NEOC) {
- break;
- }
- }
- if (j2k->state == J2K_STATE_NEOC) {
- j2k_read_eoc(j2k);
- }
-
- if (j2k->state != J2K_STATE_MT) {
- opj_event_msg(cinfo, EVT_WARNING, "Incomplete bitstream\n");
- }
- return image;
-}
/*
* Read a JPT-stream and decode file
*/
void opj_j2k_setup_decoder(opj_j2k_v2_t *j2k, opj_dparameters_t *parameters);
-/**
-Decode an image from a JPEG-2000 codestream
-@param j2k J2K decompressor handle
-@param cio Input buffer stream
-@param cstr_info Codestream information structure if required, NULL otherwise
-@return Returns a decoded image if successful, returns NULL otherwise
-*/
-opj_image_t* j2k_decode(opj_j2k_t *j2k, opj_cio_t *cio, opj_codestream_info_t *cstr_info);
/**
Decode an image form a JPT-stream (JPEG 2000, JPIP)
@param j2k J2K decompressor handle