Audio recording with microphone using Ros audio capture

edit

I am pretty new to ROS - I am trying to implement a audio recorder functionality in an existing system. Essentially I want to record an audio file for 15 seconds right after an event and include that data in a rosbag and a have a way to playback the data. Any tips and suggestions are welcome !

Edit: Okay here where I got so far. I installed the audio_common package and was able to successfully catkin_make. I launched the audio_capture.launch file I got a message saying unsupported media type. Which makes sense since I am running it on my local system without a microphone device connected. But just to test it out I wonder if i can use my dell laptops internal microphone. this is how the launch file looks like -

<launch>
  <!-- arecord -l will show available input devices, use the car number as
      the first number and the subdevice number as the second in a string
      like hw:1,0 -->
  <arg name="device" default=""/>
  <arg name="channels" default="1"/>
  <arg name="sample_rate" default="16000"/>
  <arg name="format" default="mp3"/>
  <arg name="ns" default="audio"/>

  <group ns="$(arg ns)">
    <node name="audio_capture" pkg="audio_capture" type="audio_capture" output="screen">
      <param name="bitrate" value="128"/>
      <param name="device" value="$(arg device)"/>
      <param name="channels" value="$(arg channels)"/>
      <param name="sample_rate" value="$(arg sample_rate)"/>
      <param name="format" value="$(arg format)"/>
    </node>
  </group>

</launch>

I learned that to access the internal microphone I need to access the ALSA sound architecture of linux.

https://superuser.com/questions/53957...

I tried the launch file with hw:1,0 as device name also hw:0,0. Both of them yield the following error.

SUMMARY
========

PARAMETERS
 * /audio/audio_capture/bitrate: 128
 * /audio/audio_capture/channels: 1
 * /audio/audio_capture/device: hw:1,0
 * /audio/audio_capture/format: mp3
 * /audio/audio_capture/sample_rate: 16000
 * /rosdistro: kinetic
 * /rosversion: 1.12.13

NODES
  /audio/
    audio_capture (audio_capture/audio_capture)

auto-starting new master
process[master]: started with pid [13042]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 8de21388-6c29-11e9-8596-8cec4bfad6f9
process[rosout-1]: started with pid [13055]
started core service [/rosout]
process[audio/audio_capture-2]: started with pid [13060]

(audio_capture:13060): GLib-GObject-CRITICAL **: g_object_set: assertion 'G_IS_OBJECT (object)' failed

(audio_capture:13060): GStreamer-CRITICAL **: gst_bin_add_many: assertion 'GST_IS_ELEMENT (element_1)' failed

(audio_capture:13060): GStreamer-CRITICAL **: gst_element_link_many: assertion 'GST_IS_ELEMENT (element_1)' failed
[ERROR] [1556726135.431327179]: Unsupported media type.
[audio/audio_capture-2] process has died [pid 13060, exit code 1, cmd /root/catkin_ws/devel/lib/audio_capture/audio_capture __name:=audio_capture __log:=/root/.ros/log/8de21388-6c29-11e9-8596-8cec4bfad6f9/audio-audio_capture-2.log].
log file: /root/.ros/log/8de21388-6c29-11e9-8596-8cec4bfad6f9/audio-audio_capture-2*.log

I am running my build environment in docker. I think I am not able to access the ALSA device from the docker container. I included the following in my docker script for the ALSA device --device /dev/snd successfully catkin_make but I get the same error.