diff matlab/bmm/carfac/CARFAC_SAI_hacking.m @ 604:ec3a1c74ec54

Add files for making log-lag SAI from CARFAC's NAP output.  The file
SAI_RunLayered.m dumps frames to PNG files.  The hacking script calls
ffmpeg to assemble them with the soundtrack into a movie.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/matlab/bmm/carfac/CARFAC_SAI_hacking.m	Thu May 09 03:48:44 2013 +0000
@@ -0,0 +1,72 @@
+% Copyright 2013, Google, Inc.
+% Author: Richard F. Lyon
+%
+% This Matlab file is part of an implementation of Lyon's cochlear model:
+% "Cascade of Asymmetric Resonators with Fast-Acting Compression"
+% to supplement Lyon's upcoming book "Human and Machine Hearing"
+%
+% Licensed under the Apache License, Version 2.0 (the "License");
+% you may not use this file except in compliance with the License.
+% You may obtain a copy of the License at
+%
+%     http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS,
+% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+% See the License for the specific language governing permissions and
+% limitations under the License.
+
+%% Test/demo hacking for CARFAC_SAI Matlab stuff:
+
+clear variables
+
+system('mkdir frames');
+
+%%
+
+dB_list = -40; %  -60:20:0
+
+wav_fn = 'plan.wav';
+
+if ~exist(['./', wav_fn], 'file')
+  error('wav file not found')
+end
+
+wav_fn
+[file_signal, fs] = wavread(wav_fn);
+
+if fs == 44100
+  file_signal = (file_signal(1:2:end-1, :) + file_signal(2:2:end, :)) / 2;
+  fs = fs / 2;
+end
+
+if fs ~= 22050
+  error('unexpected sample rate')
+end
+
+file_signal = file_signal(:, 1);  % mono
+file_signal = [file_signal; zeros(fs, 1)];  % pad with a second of silence
+
+
+% make a long test signal by repeating at different levels:
+test_signal = [];
+for dB =  dB_list
+  test_signal = [test_signal; file_signal * 10^(dB/20)];
+end
+
+%%
+CF_struct = CARFAC_Design(1);  % default design
+
+CF_struct = CARFAC_Init(CF_struct);
+
+[frame_rate, num_frames] = SAI_RunLayered(CF_struct, test_signal);
+
+%%
+png_name_pattern = 'frames/frame%05d.png';
+MakeMovieFromPngsAndWav(round(frame_rate), png_name_pattern, ...
+  wav_fn, ['CARFAC_SAI_movie_', wav_fn(1:end-4), '.mpg'])
+
+%%
+system('rm -r frames');
+