1 files changed, 72 insertions, 3 deletions

diff --git a/kaldi_io/src/cwrapper_kaldi.cpp b/kaldi_io/src/cwrapper_kaldi.cpp
index f48d343..c19908b 100644
--- a/kaldi_io/src/cwrapper_kaldi.cpp
+++ b/kaldi_io/src/cwrapper_kaldi.cpp
@@ -1,9 +1,11 @@
 #include <string>
+#include <map>
 #include "base/kaldi-common.h"
 #include "hmm/posterior.h"
 #include "util/table-types.h"
 typedef kaldi::BaseFloat BaseFloat;
-
+typedef std::map<std::string, kaldi::Matrix<BaseFloat> > StringToMatrix_t;
+typedef std::map<std::string, std::string > StringToString_t;
 extern "C" {
 #include "cwrapper_kaldi.h"
 #include "string.h"
@@ -61,12 +63,80 @@ extern "C" {
         return repo->feature_reader->Done();
     }
 
+    const char *kaldi_feature_repo_key(KaldiFeatureRepo *repo) {
+        return repo->feature_reader->Key().c_str();
+    }
+
     void kaldi_feature_repo_destroy(KaldiFeatureRepo *repo) {
         if (repo->feature_reader)
             delete repo->feature_reader;
         delete repo;
     }
 
+    struct KaldiLookupFeatureRepo {
+        StringToMatrix_t key2mat;
+        StringToString_t map;
+    };
+
+    KaldiLookupFeatureRepo *kaldi_lookup_feature_repo_new(const char *feature_rspecifier, const char *map_rspecifier) {
+        KaldiLookupFeatureRepo *repo = new KaldiLookupFeatureRepo();
+        kaldi::SequentialBaseFloatMatrixReader feature_reader = kaldi::SequentialBaseFloatMatrixReader(string(feature_rspecifier));
+        for (; !feature_reader.Done(); feature_reader.Next())
+        {
+            const std::string &key = feature_reader.Key();
+            const kaldi::Matrix<BaseFloat> &feat = feature_reader.Value();
+            if (repo->key2mat.find(key) != repo->key2mat.end())
+                fprintf(stderr, "[kaldi] warning: lookup feature for key %s already exists", key.c_str());
+            repo->key2mat[key] = feat;
+        }
+        kaldi::SequentialTokenVectorReader map_reader = kaldi::SequentialTokenVectorReader(string(map_rspecifier));
+        for (; !map_reader.Done(); map_reader.Next())
+        {
+            const std::vector<std::string> target = map_reader.Value();
+            assert(target.size() >= 1);
+            repo->map[map_reader.Key()] = *target.begin();
+        }
+        return repo;
+    }
+
+    Matrix *kaldi_lookup_feature_repo_read_utterance(KaldiLookupFeatureRepo *repo, KaldiFeatureRepo *frepo, int nframes, lua_State *L, int debug) {
+        Matrix *mat;                    /* nerv implementation */
+        StringToString_t::iterator mit = repo->map.find(frepo->utt);
+        if (mit == repo->map.end())
+            nerv_error(L, "[kaldi] mapped key for key %s not found", frepo->utt.c_str());
+        const std::string &key = mit->second;
+        StringToMatrix_t::iterator it = repo->key2mat.find(key);
+        if (it == repo->key2mat.end())
+            nerv_error(L, "[kaldi] lookup feature for key %s not found", key.c_str());
+        const kaldi::Matrix<BaseFloat> &kmat = it->second;
+
+        int n = kmat.NumRows() < nframes ? kmat.NumRows() : nframes;
+        int m = kmat.NumCols();
+        Status status;
+        assert(sizeof(BaseFloat) == sizeof(float));
+        if(sizeof(BaseFloat) == sizeof(float))
+            mat = nerv_matrix_host_float_create(n, m, &status);
+        else if(sizeof(BaseFloat) == sizeof(double))
+            mat = nerv_matrix_host_double_create(n, m, &status);
+        NERV_LUA_CHECK_STATUS(L, status);
+        size_t stride = mat->stride;
+        if (debug)
+            fprintf(stderr, "[kaldi] lookup feature: %s %d %d\n", frepo->utt.c_str(), n, m);
+
+        for (int i = 0; i < n; i++)
+        {
+            const BaseFloat *row = kmat.RowData(i);
+            BaseFloat *nerv_row = (BaseFloat *)((char *)mat->data.f + i * stride);
+            /* use memmove to copy the row, since KaldiLib uses compact storage */
+            memmove(nerv_row, row, sizeof(BaseFloat) * m);
+        }
+        return mat;
+    }
+
+    void kaldi_lookup_feature_repo_destroy(KaldiLookupFeatureRepo *repo) {
+        delete repo;
+    }
+
     struct KaldiLabelRepo {
         kaldi::RandomAccessPosteriorReader *targets_reader;
     };
@@ -77,7 +147,7 @@ extern "C" {
         return repo;
     }
 
-    Matrix *kaldi_label_repo_read_utterance(KaldiLabelRepo *repo, KaldiFeatureRepo *frepo, int frm_ext, int nframes,
+    Matrix *kaldi_label_repo_read_utterance(KaldiLabelRepo *repo, KaldiFeatureRepo *frepo, int nframes,
                                             lua_State *L,
                                             int debug) {
         Matrix *mat;
@@ -94,7 +164,6 @@ extern "C" {
             mat = nerv_matrix_host_double_create(n, m, &status);
         NERV_LUA_CHECK_STATUS(L, status);
         size_t stride = mat->stride;
-
         if (debug)
             fprintf(stderr, "[kaldi] label: %s %d %d\n", frepo->utt.c_str(), n, m);
         for (int i = 0; i < n; i++)