Implement a demo mode

src/auracast/multicast.py

@@ -277,7 +277,7 @@ async def init_broadcast(
 
         logging.debug(f'big{i} parameters are:')
         logging.debug('%s', pprint.pformat(vars(big)))
-        logging.debug(f'Finished setup of big{i}.')
+        logging.info(f'Finished setup of big{i}.')
 
     await asyncio.sleep(i+1) # Wait for advertising to set up
 

src/auracast/server/multicast_frontend.py

@@ -1,5 +1,6 @@
 # frontend/app.py
 import os
+import time
 import streamlit as st
 import requests
 from auracast import auracast_config
@@ -12,6 +13,13 @@ if 'stream_started' not in st.session_state:
 # Global: desired packetization time in ms for Opus (should match backend)
 PTIME = 40
 BACKEND_URL = "http://localhost:5000"
+TRANSPORT1 = "auto" #'serial:/dev/ttyAMA3,1000000,rtscts', # transport for raspberry pi gpio header
+QUALITY_MAP = {
+    "High (48kHz)": {"rate": 48000, "octets": 120},
+    "Good (32kHz)": {"rate": 32000, "octets": 80},
+    "Medium (24kHz)": {"rate": 24000, "octets": 60},
+    "Fair (16kHz)": {"rate": 16000, "octets": 40},
+}
 
 # Try loading persisted settings from backend
 saved_settings = {}
@@ -25,7 +33,7 @@ except Exception:
 st.title("🎙️ Auracast Audio Mode Control")
 
 # Audio mode selection with persisted default
-options = ["Webapp", "USB"]
+options = ["Webapp", "USB", "Demo"]
 saved_audio_mode = saved_settings.get("audio_mode", "Webapp")
 if saved_audio_mode not in options:
     saved_audio_mode = "Webapp"
@@ -34,18 +42,108 @@ audio_mode = st.selectbox(
     "Audio Mode",
     options,
     index=options.index(saved_audio_mode),
-    help="Select the audio input source. Choose 'Webapp' for browser microphone or 'USB' for a connected hardware device."
+    help="Select the audio input source. Choose 'Webapp' for browser microphone, 'USB' for a connected hardware device, or 'Demo' for a simulated stream."
 )
 
-if audio_mode in ["Webapp", "USB"]:
-    # Stream quality selection (now enabled)
-    quality_map = {
-        "High (48kHz)": {"rate": 48000, "octets": 120},
-        "Good (32kHz)": {"rate": 32000, "octets": 80},
-        "Medium (24kHz)": {"rate": 24000, "octets": 60},
-        "Fair (16kHz)": {"rate": 16000, "octets": 40},
+if audio_mode == "Demo":
+    demo_stream_map = {
+        "1 × 48kHz": {"quality": "High (48kHz)", "streams": 1,},
+        "2 × 24kHz": {"quality": "Medium (24kHz)", "streams": 2,},
+        "3 × 16kHz": {"quality": "Fair (16kHz)", "streams": 3,},
     }
-    quality_options = list(quality_map.keys())
+    demo_options = list(demo_stream_map.keys())
+    default_demo = demo_options[0]
+    demo_selected = st.selectbox(
+        "Demo Stream Type",
+        demo_options,
+        index=0,
+        help="Select the demo stream configuration."
+    )
+    #st.info(f"Demo mode selected: {demo_selected} (Streams: {demo_stream_map[demo_selected]['streams']}, Rate: {demo_stream_map[demo_selected]['rate']} Hz)")
+    # Start/Stop buttons for demo mode
+    if 'demo_stream_started' not in st.session_state:
+        st.session_state['demo_stream_started'] = False
+    col1, col2 = st.columns(2)
+    with col1:
+        start_demo = st.button("Start Demo Stream")
+    with col2:
+        stop_demo = st.button("Stop Demo Stream")
+    if start_demo:
+        # Always stop any running stream for clean state
+        try:
+            requests.post(f"{BACKEND_URL}/stop_audio").json()
+        except Exception:
+            pass
+        time.sleep(1)
+        demo_cfg = demo_stream_map[demo_selected]
+        # Octets per frame logic matches quality_map
+        q = QUALITY_MAP[demo_cfg['quality']]
+        
+        if demo_cfg['streams'] >= 1:
+            bigs = [
+                auracast_config.AuracastBigConfigDeu(
+                    audio_source=f'file:../testdata/wave_particle_5min_de_{int(q["rate"]/1000)}kHz_mono.wav',
+                    iso_que_len=32,
+                    sampling_frequency=q['rate'],
+                    octets_per_frame=q['octets'],
+                )
+            ]
+        if demo_cfg['streams'] >= 2:
+            bigs += [
+                auracast_config.AuracastBigConfigEng(
+                    audio_source=f'file:../testdata/wave_particle_5min_en_{int(q["rate"]/1000)}kHz_mono.wav',
+                    iso_que_len=32,
+                    sampling_frequency=q['rate'],
+                    octets_per_frame=q['octets'],
+                ),
+            ]
+        if demo_cfg['streams'] >= 3:
+            bigs += [
+                auracast_config.AuracastBigConfigFra(
+                    audio_source=f'file:../testdata/wave_particle_5min_fr_{int(q["rate"]/1000)}kHz_mono.wav',
+                    iso_que_len=32,
+                    sampling_frequency=q['rate'],
+                    octets_per_frame=q['octets'],
+                ),
+            ]
+
+        config = auracast_config.AuracastConfigGroup(
+            auracast_sampling_rate_hz=q['rate'],
+            octets_per_frame=q['octets'],
+            transport=TRANSPORT1, # transport for raspberry pi gpio header
+            bigs = bigs
+        )
+
+        try:
+            r = requests.post(f"{BACKEND_URL}/init", json=config.model_dump())
+            if r.status_code == 200:
+                st.session_state['demo_stream_started'] = True
+                st.success(f"Demo stream started: {demo_selected}")
+            else:
+                st.session_state['demo_stream_started'] = False
+                st.error(f"Failed to initialize demo: {r.text}")
+        except Exception as e:
+            st.session_state['demo_stream_started'] = False
+            st.error(f"Error: {e}")
+    elif stop_demo:
+        try:
+            r = requests.post(f"{BACKEND_URL}/stop_audio").json()
+            st.session_state['demo_stream_started'] = False
+            if r.get('was_running'):
+                st.info("Demo stream stopped.")
+            else:
+                st.info("Demo stream was not running.")
+        except Exception as e:
+            st.error(f"Error: {e}")
+    elif st.session_state['demo_stream_started']:
+        st.success(f"Demo stream running: {demo_selected}")
+    else:
+        st.info("Demo stream not running.")
+    quality = None  # Not used in demo mode
+else:
+    # Stream quality selection (now enabled)
+
+    quality_options = list(QUALITY_MAP.keys())
     default_quality = "Medium (24kHz)" if "Medium (24kHz)" in quality_options else quality_options[0]
     quality = st.selectbox(
         "Stream Quality (Sampling Rate)",
@@ -119,7 +217,7 @@ if audio_mode in ["Webapp", "USB"]:
             input_device = selected_option.split(":", 1)[0] if ":" in selected_option else selected_option
     else:
         input_device = None
-    import time
+    
     start_stream = st.button("Start Auracast")
     stop_stream = st.button("Stop Auracast")
 
@@ -164,13 +262,13 @@ if audio_mode in ["Webapp", "USB"]:
             st.success("Stream Stopped!")
 
         # Small pause lets backend fully release audio devices before re-init
-        import time; time.sleep(1)
+        time.sleep(1)
         # Prepare config using the model (do NOT send qos_config, only relevant fields)
-        q = quality_map[quality]
+        q = QUALITY_MAP[quality]
         config = auracast_config.AuracastConfigGroup(
             auracast_sampling_rate_hz=q['rate'],
             octets_per_frame=q['octets'],
-            transport='serial:/dev/ttyAMA3,1000000,rtscts', # transport for raspberry pi gpio header
+            transport=TRANSPORT1, # transport for raspberry pi gpio header
             bigs = [
                 auracast_config.AuracastBigConfig(
                     name=stream_name,
@@ -254,9 +352,9 @@ if audio_mode in ["Webapp", "USB"]:
         """
         st.components.v1.html(component, height=0)
         st.session_state['stream_started'] = True
-else:
-    st.header("Advertised Streams (Cloud Announcements)")
-    st.info("This feature requires backend support to list advertised streams.")
+#else:
+#    st.header("Advertised Streams (Cloud Announcements)")
+#    st.info("This feature requires backend support to list advertised streams.")
     # Placeholder for future implementation
     # Example: r = requests.get(f"{BACKEND_URL}/advertised_streams")
     # if r.status_code == 200:

src/auracast/server/multicast_server.py

@@ -96,6 +96,9 @@ async def initialize(conf: auracast_config.AuracastConfigGroup):
         elif first_source == 'webrtc':
             audio_mode_persist = 'Webapp'
             input_device = None
+        elif first_source.startswith('file:'):
+            audio_mode_persist = 'Demo'
+            input_device = None
         else:
             audio_mode_persist = 'Network'
             input_device = None
@@ -129,7 +132,9 @@ async def initialize(conf: auracast_config.AuracastConfigGroup):
         # Auto-start streaming only when using a local USB audio device. For Webapp mode the
         # streamer is started by the /offer handler once the WebRTC track arrives so we know
         # the peer connection is established.
-        if any(big.audio_source.startswith("device:") for big in conf.bigs):
+        # TODO rather do a if not webrtc in the future
+        if any(big.audio_source.startswith("device:") or big.audio_source.startswith("file:") for big in conf.bigs):
+            log.info("Auto-starting streaming")
             await multicaster.start_streaming()
     except Exception as e:
         log.error("Exception in /init: %s", traceback.format_exc())
@@ -362,6 +367,8 @@ async def shutdown():
         raise HTTPException(status_code=500, detail=str(e))
 
 if __name__ == '__main__':
+    import os
+    os.chdir(os.path.dirname(__file__))
     import uvicorn
     log.basicConfig( # for debug log level export LOG_LEVEL=DEBUG
         level=os.environ.get('LOG_LEVEL', log.INFO),