void delete_ocr (void** arg)
{
struct ocrCtx* ctx = *arg;
TessBaseAPIEnd(ctx->api);
TessBaseAPIDelete(ctx->api);
freep(arg);
}
void _dinit_hardsubx(struct lib_hardsubx_ctx **ctx)
{
struct lib_hardsubx_ctx *lctx = *ctx;
// Free all memory allocated to everything in the context
// Free OCR
TessBaseAPIEnd(lctx->tess_handle);
TessBaseAPIDelete(lctx->tess_handle);
//Free subtitle
freep(lctx->dec_sub);
freep(ctx);
}
static const VSFrameRef *VS_CC OCRGetFrame(int n, int activationReason,
void **instanceData,
void **frameData,
VSFrameContext *frameCtx,
VSCore *core,
const VSAPI *vsapi)
{
OCRData *d = (OCRData *) * instanceData;
if (activationReason == arInitial) {
vsapi->requestFrameFilter(n, d->node, frameCtx);
} else if (activationReason == arAllFramesReady) {
const VSFrameRef *src = vsapi->getFrameFilter(n, d->node, frameCtx);
VSFrameRef *dst = vsapi->copyFrame(src, core);
VSMap *m = vsapi->getFramePropsRW(dst);
const uint8_t *srcp = vsapi->getReadPtr(src, 0);
int width = vsapi->getFrameWidth(src, 0);
int height = vsapi->getFrameHeight(src, 0);
int stride = vsapi->getStride(src, 0);
TessBaseAPI *api = TessBaseAPICreate();
if (TessBaseAPIInit3(api, d->datapath, d->language) == -1) {
vsapi->setFilterError("Failed to initialize Tesseract", frameCtx);
TessBaseAPIDelete(api);
vsapi->freeFrame(src);
vsapi->freeFrame(dst);
return 0;
}
if (d->options) {
int i, err;
int nopts = vsapi->propNumElements(d->options, "options");
for (i = 0; i < nopts; i += 2) {
const char *key = vsapi->propGetData(d->options, "options",
i, &err);
const char *value = vsapi->propGetData(d->options, "options",
i + 1, &err);
if (!TessBaseAPISetVariable(api, key, value)) {
char msg[200];
snprintf(msg, 200,
"Failed to set Tesseract option '%s'", key);
vsapi->setFilterError(msg, frameCtx);
TessBaseAPIEnd(api);
TessBaseAPIDelete(api);
vsapi->freeFrame(src);
vsapi->freeFrame(dst);
return 0;
}
}
}
{
unsigned i;
char *result = TessBaseAPIRect(api, srcp, 1,
stride, 0, 0, width, height);
int *confs = TessBaseAPIAllWordConfidences(api);
int length = strlen(result);
for (; length > 0 && isspace(result[length - 1]); length--);
vsapi->propSetData(m, "OCRString", result, length, paReplace);
for (i = 0; confs[i] != -1; i++) {
vsapi->propSetInt(m, "OCRConfidence", confs[i], paAppend);
}
free(confs);
free(result);
}
TessBaseAPIEnd(api);
TessBaseAPIDelete(api);
vsapi->freeFrame(src);
return dst;
}
return 0;
}