From d15e78188a9cdbd70640ac57e42d4a598c89b532 Mon Sep 17 00:00:00 2001
From: John Glover <j@johnglover.net>
Date: Fri, 6 Jul 2012 14:53:01 +0100
Subject: [residual] Add C++ implementation of SMSResidual.

---
 tests/create_libsms_test_data.py | 74 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

(limited to 'tests/create_libsms_test_data.py')

diff --git a/tests/create_libsms_test_data.py b/tests/create_libsms_test_data.py
index 553c292..05b8cee 100644
--- a/tests/create_libsms_test_data.py
+++ b/tests/create_libsms_test_data.py
@@ -251,11 +251,83 @@ def _harmonic_synthesis(det_synth_type):
     return synth_audio
 
 
+def _residual_synthesis():
+    pysms.sms_init()
+    snd_header = pysms.SMS_SndHeader()
+
+    if(pysms.sms_openSF(audio_path, snd_header)):
+        raise NameError(pysms.sms_errorString())
+
+    analysis_params = _pysms_analysis_params(sampling_rate)
+    analysis_params.nStochasticCoeff = 128
+    analysis_params.iStochasticType = pysms.SMS_STOC_APPROX
+    if pysms.sms_initAnalysis(analysis_params, snd_header) != 0:
+        raise Exception("Error allocating memory for analysis_params")
+    analysis_params.iSizeSound = num_samples
+    analysis_params.nFrames = num_frames
+    sms_header = pysms.SMS_Header()
+    pysms.sms_fillHeader(sms_header, analysis_params, "pysms")
+
+    sample_offset = 0
+    size_new_data = 0
+    current_frame = 0
+    analysis_frames = []
+    do_analysis = True
+
+    while do_analysis and (current_frame < num_frames):
+        sample_offset += size_new_data
+        size_new_data = analysis_params.sizeNextRead
+
+        frame_audio = audio[sample_offset:sample_offset + size_new_data]
+        frame_audio = np.array(frame_audio, dtype=np.float32)
+        if len(frame_audio) < size_new_data:
+            frame_audio = np.hstack((
+                frame_audio, np.zeros(size_new_data - len(frame_audio),
+                                      dtype=np.float32)
+            ))
+
+        analysis_data = pysms.SMS_Data()
+        pysms.sms_allocFrameH(sms_header, analysis_data)
+        status = pysms.sms_analyze(frame_audio, analysis_data,
+                                   analysis_params)
+
+        analysis_frames.append(analysis_data)
+        current_frame += 1
+
+        if status == -1:
+            do_analysis = False
+
+    sms_header.nFrames = len(analysis_frames)
+    synth_params = _pysms_synthesis_params(sampling_rate)
+    synth_params.iStochasticType = pysms.SMS_STOC_APPROX
+    synth_params.iSynthesisType = pysms.SMS_STYPE_STOC
+    pysms.sms_initSynth(sms_header, synth_params)
+
+    synth_frame = np.zeros(synth_params.sizeHop, dtype=np.float32)
+    synth_audio = np.array([], dtype=np.float32)
+
+    for i in range(len(analysis_frames)):
+        pysms.sms_synthesize(analysis_frames[i], synth_frame, synth_params)
+        synth_audio = np.hstack((synth_audio, synth_frame))
+
+    synth_audio = np.asarray(synth_audio * 32768, np.int16)
+
+    for frame in analysis_frames:
+        pysms.sms_freeFrame(frame)
+    pysms.sms_freeAnalysis(analysis_params)
+    pysms.sms_closeSF()
+    pysms.sms_freeSynth(synth_params)
+    pysms.sms_free()
+
+    return synth_audio
+
+
 if __name__ == '__main__':
     size_next_read = _size_next_read()
     partial_tracking = _partial_tracking()
     harmonic_synthesis_ifft = _harmonic_synthesis('ifft')
     harmonic_synthesis_sin = _harmonic_synthesis('sin')
+    residual_synthesis = _residual_synthesis()
 
     test_data = {'size_next_read': size_next_read,
                  'peak_detection': partial_tracking,
@@ -269,3 +341,5 @@ if __name__ == '__main__':
               harmonic_synthesis_ifft)
     wav.write('libsms_harmonic_synthesis_sin.wav', sampling_rate,
               harmonic_synthesis_sin)
+    wav.write('libsms_residual_synthesis.wav', sampling_rate,
+              residual_synthesis)
-- 
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