limiting file length in demos

app.py

@@ -15,19 +15,19 @@ args = du.get_default_bd_args()
 args['detection_threshold'] = 0.3
 args['time_expansion_factor'] = 1
 args['model_path'] = 'models/Net2DFast_UK_same.pth.tar'
+max_duration = 2.0
 
 # load the model
 model, params = du.load_model(args['model_path'])
 
 
 df =  gr.Dataframe(
-        headers=["species", "time_in_file", "species_prob"],
-        datatype=["str", "str", "str"],
+        headers=["species", "time", "detection_prob", "species_prob"],
+        datatype=["str", "str", "str", "str"],
         row_count=1,
-        col_count=(3, "fixed"),
+        col_count=(4, "fixed"),
     )
     
-
 examples = [['example_data/audio/20170701_213954-MYOMYS-LR_0_0.5.wav', 0.3],
             ['example_data/audio/20180530_213516-EPTSER-LR_0_0.5.wav', 0.3],
             ['example_data/audio/20180627_215323-RHIFER-LR_0_0.5.wav', 0.3]]
@@ -40,31 +40,63 @@ def make_prediction(file_name=None, detection_threshold=0.3):
     else:
         return "You must provide an input audio file."
     
-    if detection_threshold != '':
+    if detection_threshold is not None and detection_threshold != '':
         args['detection_threshold'] = float(detection_threshold)
     
-    results = du.process_file(audio_file, model, params, args, max_duration=5.0)
+    # process the file to generate predictions
+    results = du.process_file(audio_file, model, params, args, max_duration=max_duration)
     
-    clss = [aa['class'] for aa in results['pred_dict']['annotation']]
-    st_time = [aa['start_time'] for aa in results['pred_dict']['annotation']]
-    cls_prob = [aa['class_prob'] for aa in results['pred_dict']['annotation']]
+    anns = [ann for ann in results['pred_dict']['annotation']]
+    clss = [aa['class'] for aa in anns]
+    st_time = [aa['start_time'] for aa in anns]
+    cls_prob = [aa['class_prob'] for aa in anns]
+    det_prob = [aa['det_prob'] for aa in anns]
+    data = {'species': clss, 'time': st_time, 'detection_prob': det_prob, 'species_prob': cls_prob}
     
-    data = {'species': clss, 'time_in_file': st_time, 'species_prob': cls_prob}
     df = pd.DataFrame(data=data)
+    im = generate_results_image(audio_file, anns)
     
-    return df
+    return [df, im]
+
+
+def generate_results_image(audio_file, anns): 
+    
+    # load audio
+    sampling_rate, audio = au.load_audio_file(audio_file, args['time_expansion_factor'], 
+                           params['target_samp_rate'], params['scale_raw_audio'], max_duration=max_duration)
+    duration = audio.shape[0] / sampling_rate
+        
+    # generate spec
+    spec, spec_viz = au.generate_spectrogram(audio, sampling_rate, params, True, False)
+
+    # create fig
+    plt.close('all')
+    fig = plt.figure(1, figsize=(spec.shape[1]/100, spec.shape[0]/100), dpi=100, frameon=False)
+    spec_duration = au.x_coords_to_time(spec.shape[1], sampling_rate, params['fft_win_length'], params['fft_overlap'])
+    viz.create_box_image(spec, fig, anns, 0, spec_duration, spec_duration, params, spec.max()*1.1, False, True)
+    plt.ylabel('Freq - kHz')
+    plt.xlabel('Time - secs')
+    plt.tight_layout()
+    
+    # convert fig to image
+    fig.canvas.draw()
+    data = np.frombuffer(fig.canvas.tostring_rgb(), dtype=np.uint8)
+    w, h = fig.canvas.get_width_height()
+    im = data.reshape((int(h), int(w), -1))
+
+    return im
 
 
 descr_txt = "Demo of BatDetect2 deep learning-based bat echolocation call detection. " \
           "<br>This model is only trained on bat species from the UK. If the input " \
-          "file is longer than 5 seconds, only the first 5 seconds will be processed." \
+          "file is longer than 2 seconds, only the first 2 seconds will be processed." \
           "<br>Check out the paper [here](https://www.biorxiv.org/content/10.1101/2022.12.14.520490v1)."
 
 gr.Interface(
     fn = make_prediction,
     inputs = [gr.Audio(source="upload", type="filepath", optional=True), 
               gr.Dropdown([0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9])],
-    outputs = df,
+    outputs = [df, "image"],
     theme = "huggingface",
     title = "BatDetect2 Demo",
     description = descr_txt,

bat_detect/utils/audio_utils.py

@@ -64,7 +64,7 @@ def generate_spectrogram(audio, sampling_rate, params, return_spec_for_viz=False
     return spec, spec_for_viz
 
 
-def load_audio_file(audio_file, time_exp_fact, target_samp_rate, scale=False):
+def load_audio_file(audio_file, time_exp_fact, target_samp_rate, scale=False, max_duration=False):
     with warnings.catch_warnings():
         warnings.filterwarnings('ignore', category=wavfile.WavFileWarning)
         #sampling_rate, audio_raw = wavfile.read(audio_file)
@@ -79,6 +79,11 @@ def load_audio_file(audio_file, time_exp_fact, target_samp_rate, scale=False):
     sampling_rate = target_samp_rate
     audio_raw = librosa.resample(audio_raw, orig_sr=sampling_rate_old, target_sr=sampling_rate, res_type='polyphase')
 
+    # clipping maximum duration
+    if max_duration is not False:
+        max_duration = np.minimum(int(sampling_rate*max_duration), audio_raw.shape[0])
+        audio_raw = audio_raw[:max_duration]
+        
     # convert to float32 and scale
     audio_raw = audio_raw.astype(np.float32)
     if scale:

batdetect2_notebook.ipynb

@@ -58,7 +58,8 @@
     "args = du.get_default_bd_args()\n",
     "args['detection_threshold'] = 0.3\n",
     "args['time_expansion_factor'] = 1\n",
-    "args['model_path'] = 'models/Net2DFast_UK_same.pth.tar'"
+    "args['model_path'] = 'models/Net2DFast_UK_same.pth.tar'\n",
+    "max_duration = 2.0"
    ]
   },
   {
@@ -101,7 +102,7 @@
    "outputs": [],
    "source": [
     "# run the model\n",
-    "results = du.process_file(audio_file, model, params, args, max_duration=5.0)"
+    "results = du.process_file(audio_file, model, params, args, max_duration=max_duration)"
    ]
   },
   {
@@ -174,7 +175,7 @@
    ],
    "source": [
     "# read the audio file \n",
-    "sampling_rate, audio = au.load_audio_file(audio_file, args['time_expansion_factor'], params['target_samp_rate'], params['scale_raw_audio'])\n",
+    "sampling_rate, audio = au.load_audio_file(audio_file, args['time_expansion_factor'], params['target_samp_rate'], params['scale_raw_audio'], max_duration=max_duration)\n",
     "duration = audio.shape[0] / sampling_rate\n",
     "print('File duration: {} seconds'.format(duration))"
    ]