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lib-src/libnyquist/nyquist/cmupv/src/cmupvdbg.c

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+/* cmupvdbg.c -- debug support for cmupv
+ * Roger B. Dannenberg
+ * Nov 2015
+ */
+
+/* To see what data is going into the phase vocoder, write_pv_frame
+ * saves frames or buffers to disk as audio.
+ * If something is wrong with your applications delivery of analysis frames,
+ * probably most frames are wrong, so you should write, say, 10 initial
+ * files and look at them. Set MAX_FILES to 10 and MAX_SAVE to 10. Then,
+ * after running your program, use Audacity to open the 10 frames saved
+ * to disk: use the Files:Import:Audio command to load all 10 in one 
+ * command as different tracks. You should see 10 tracks, each containing
+ * one frame, shifted to the correct source time location. (If not, then
+ * find and fix the bug.)
+ *
+ * This function is also useful for printing other data, e.g. synthesis frames
+ * or output buffers. To get the most out of this, you should set the first
+ * parameter, zeros, to the absolute sample offset, e.g. if you want to view
+ * synthesis frames that are spaced with a 64 sample hop size, you should set
+ * zeros to 0, 64, 128, 192, ... so that when you view the files in Audacity,
+ * the samples will line up in time with each other and with the output file.
+ *
+ * You can display multiple frame types and lengths, so the prefix parameter
+ * allows you to effectively label the data. This prefix is used to construct
+ * the file name.
+ *
+ * MAX_FILES tells how many files to write. Because of padding, file writing
+ * is an N-squared operation, so only write initial frames if possible, but
+ * use a large number if you need to see everything.
+ *
+ * MAX_SAVE tells how many file *names* to use. Files are numbered, so we'll
+ * simply take the number modulo MAX_SAVE so that file names are reused and
+ * old files are overwritten. Use a large value of MAX_SAVE to save everything.
+ * Use 1 to get only the last frame.
+ */
+
+#include "stdio.h"
+#include "sndfile.h"
+
+
+#define MAX_FILES 10
+#define MAX_SAVE 10
+static int file_no = 0;
+
+
+void write_pv_frame(long zeros, float *frame, long fftsize, char *prefix)
+{
+    float z = 0;
+    char path[128];
+    SF_INFO sfinfo;
+    SNDFILE *sf;
+    if (file_no >= MAX_FILES) return;
+    sprintf(path, "%s-%02d.wav", prefix, (file_no % MAX_SAVE) + 1);
+    sfinfo.frames = 0;
+    sfinfo.samplerate = 44100;
+    sfinfo.channels = 1;
+    sfinfo.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
+    sfinfo.sections = 0;
+    sfinfo.seekable = 0;
+    sf = sf_open(path, SFM_WRITE, &sfinfo);
+    for (long i = 0; i < zeros; i++) {
+        sf_writef_float(sf, &z, 1);
+    }
+    sf_writef_float(sf, frame, fftsize);
+    sf_close(sf);
+    printf("wrote %s, %ld zeros\n", path, zeros);
+    file_no++;
+}