Commit graph

6 commits

Author SHA1 Message Date
Lu, Han
e1b7a5f376 alsabat: add a single channel sine wave generator
Add function generate_sine_wave_raw_mono(). It serves as a single
channel sine wave generator, to provide data for calculation (e.g.
for noise analysis).
The function is similar to generate_sine_wave(), but a lite revision.
It has no dependency on bat channels and target frequency, no malloc
inside, no data conversion from float to integer samples, and supports
one channel only.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-06-08 15:14:06 +02:00
Lu, Han
e0c1c86a90 alsabat: add channels parameter for adjust_waveform()
The function adjust_waveform() is a component of generate_sine_wave(),
and depended on bat->channels parameter. Add parameter "channels" to
remove the dependency, and then adjust_waveform() can be applied on
other use cases, e.g. a single channel sine wave generator.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-06-08 15:13:53 +02:00
Lu, Han
09cb66f40c alsabat: align the data type on float
Aligning the data type of fftw analyzer, sample converter and other
components on float, because:
  1. avoid unnecessary data type conversion;
  2. using float is more efficient than using double;
  3. the extra double accuracy is not required.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-06-08 15:12:27 +02:00
Lu, Han
2b3adf8668 alsabat: fix a possible memory leak
Fix a possible memory leak in generate_sine_wave(). Memory free was
ignored when the function return an error.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-06-01 12:33:44 +02:00
Lu, Han
986db20331 alsabat: move alsa process to a single block
Move all alsa callings to a single block (alsa.c), so other blocks
such as the main structure, the signal process and the data analysis
modules will be independent to alsa, and new modules such as a
tinyalsa interface can be easily embedded into alsabat.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-03-23 17:51:22 +01:00
Lu, Han
34e9ae911f BAT: Add signal generator
Add function that generates sine waveform through math lib.
The waveform can be used as source for playback or analysis.

Signed-off-by: Lu, Han <han.lu@intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@intel.com>
Signed-off-by: Bernard Gautier <bernard.gautier@intel.com>
Signed-off-by: Caleb Crome <caleb@crome.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-10-02 12:42:02 +02:00