From: "Lu, Han" han.lu@intel.com
BAT (Basic Audio Tester) is a simple command line utility intended to automate audio driver and sound server QA testing with no human interaction.
BAT works by playing an audio stream and capturing the same stream in either a digital or analog loop back. It then compares the captured stream to the original to determine if the test case passes or fails.
The main idea of frequency detecting is: The analysis function reads data from WAV file, run FFT against the data to get magnitude of frequency vectors, and then calculates the average value and standard deviation of frequency vectors. After that, we define a threshold: threshold = 3 * standard_deviation + average_value Frequencies with amplitude larger than threshold will be recognized as a peak, and the frequency with largest peak value will be recognized as a detected frequency. BAT then compares the detected frequency to target frequency, to decide if the detecting passes or fails.
BAT supports 4 working modes: 1. Single line playback; 2. Single line capture and analysis; 3. Playback and capture in loop, and analyze captured data; 4. Local analyze without actual playback or capture. BAT will check devices input by user to decide which mode to use. BAT will create threads for playback and record, and will run spectrum analysis for mode 2, 3 or 4.
Changes on V2: 1. Adopt Caleb Crome's method to generate sine signal to avoids unwanted distortion on waveform.
Lu, Han (7): BAT: Add initial functions BAT: Add common definitions and functions BAT: Add playback and record functions BAT: Add signal generator BAT: Add converting functions BAT: Add spectrum analysis functions BAT: Add Makefile and configures
Makefile.am | 3 + bat/Makefile.am | 14 ++ bat/alsa.c | 594 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ bat/alsa.h | 20 ++ bat/analyze.c | 314 +++++++++++++++++++++++++++++ bat/analyze.h | 16 ++ bat/bat.c | 603 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ bat/common.c | 198 +++++++++++++++++++ bat/common.h | 176 +++++++++++++++++ bat/convert.c | 113 +++++++++++ bat/convert.h | 23 +++ bat/signal.c | 182 +++++++++++++++++ bat/signal.h | 30 +++ configure.ac | 19 +- 14 files changed, 2304 insertions(+), 1 deletion(-) create mode 100644 bat/Makefile.am create mode 100644 bat/alsa.c create mode 100644 bat/alsa.h create mode 100644 bat/analyze.c create mode 100644 bat/analyze.h create mode 100644 bat/bat.c create mode 100644 bat/common.c create mode 100644 bat/common.h create mode 100644 bat/convert.c create mode 100644 bat/convert.h create mode 100644 bat/signal.c create mode 100644 bat/signal.h