add implementation for kaldi io (by ymz)

1 files changed, 47 insertions, 0 deletions

diff --git a/kaldi_io/init.lua b/kaldi_io/init.lua
new file mode 100644
index 0000000..0ad3a60
--- /dev/null
+++ b/kaldi_io/init.lua
@@ -0,0 +1,47 @@
+require 'libkaldiio'
+require 'speech_utils'
+local KaldiReader = nerv.class("nerv.KaldiReader", "nerv.DataReader")
+
+function KaldiReader:__init(global_conf, reader_conf)
+    self.feat_id = reader_conf.id
+    self.frm_ext = reader_conf.frm_ext
+    self.gconf = global_conf
+    self.global_transf = reader_conf.global_transf
+    self.debug = global_conf.debug
+    if self.debug == nil then
+        self.debug = false
+    end
+    self.feat_repo = nerv.KaldiFeatureRepo(reader_conf.feature_rspecifier)
+
+    self.lab_repo = {}
+    for id, mlf_spec in pairs(reader_conf.mlfs) do
+        self.lab_repo[id] = nerv.KaldiLabelRepo(mlf_spec.targets_rspecifier,
+                                            mlf_spec.format)
+    end
+end
+
+function KaldiReader:get_data()
+    if self.feat_repo:is_end() then
+        return nil
+    end
+    local res = {}
+    -- read Kaldi feature
+    local feat_utter = self.feat_repo:cur_utter(self.debug)
+    -- global transf
+    local transformed = nerv.speech_utils.global_transf(feat_utter,
+                            self.global_transf, self.frm_ext, 0, self.gconf)
+    res[self.feat_id] = transformed
+    -- add corresponding labels
+    for id, repo in pairs(self.lab_repo) do
+        local lab_utter = repo:get_utter(self.feat_repo,
+                                        self.frm_ext,
+                                        transformed:nrow(),
+                                        self.debug)
+        res[id] = lab_utter
+        --print(lab_utter)
+    end
+    -- move the pointer to next
+    self.feat_repo:next()
+    collectgarbage("collect")
+    return res
+end