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-rw-r--r--src/compress.c392
1 files changed, 392 insertions, 0 deletions
diff --git a/src/compress.c b/src/compress.c
new file mode 100644
index 000000000..e6c6cd6fb
--- /dev/null
+++ b/src/compress.c
@@ -0,0 +1,392 @@
+/* compress.c
+** Compressor logic
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "compress.h"
+
+#ifdef USE_X
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+static Display *display;
+static Window window;
+static Visual *visual;
+static int screen;
+static GC blackGC, whiteGC, blueGC, yellowGC, dkyellowGC, redGC;
+#endif
+
+static int *peaks = NULL;
+static int gainCurrent, gainTarget;
+
+static struct {
+ int show_mon;
+ int anticlip;
+ int target;
+ int gainmax;
+ int gainsmooth;
+ int buckets;
+} prefs;
+
+#ifdef USE_X
+static int mon_init = 0;
+#endif
+
+void CompressCfg(int show_mon, int anticlip, int target, int gainmax,
+ int gainsmooth, int buckets)
+{
+ static int lastsize = 0;
+
+ prefs.show_mon = show_mon;
+ prefs.anticlip = anticlip;
+ prefs.target = target;
+ prefs.gainmax = gainmax;
+ prefs.gainsmooth = gainsmooth;
+ prefs.buckets = buckets;
+
+ /* Allocate the peak structure */
+ peaks = realloc(peaks, sizeof(int)*prefs.buckets);
+
+ if (prefs.buckets > lastsize)
+ memset(peaks + lastsize, 0, sizeof(int)*(prefs.buckets
+ - lastsize));
+ lastsize = prefs.buckets;
+
+#ifdef USE_X
+ /* Configure the monitor window if needed */
+ if (show_mon && !mon_init)
+ {
+ display = XOpenDisplay(getenv("DISPLAY"));
+
+ /* We really shouldn't try to init X if there's no X */
+ if (!display)
+ {
+ fprintf(stderr,
+ "X not detected; disabling monitor window\n");
+ show_mon = prefs.show_mon = 0;
+ }
+ }
+
+ if (show_mon && !mon_init)
+ {
+ XGCValues gcv;
+ XColor col;
+
+ gainCurrent = gainTarget = (1 << GAINSHIFT);
+
+
+
+ screen = DefaultScreen(display);
+ visual = DefaultVisual(display, screen);
+ window = XCreateSimpleWindow(display,
+ RootWindow(display, screen),
+ 0, 0, prefs.buckets, 128 + 8, 0,
+ BlackPixel(display, screen),
+ WhitePixel(display, screen));
+ XStoreName(display, window, "AudioCompress monitor");
+
+ gcv.foreground = BlackPixel(display, screen);
+ blackGC = XCreateGC(display, window, GCForeground, &gcv);
+ gcv.foreground = WhitePixel(display, screen);
+ whiteGC = XCreateGC(display, window, GCForeground, &gcv);
+ col.red = 0;
+ col.green = 0;
+ col.blue = 65535;
+ XAllocColor(display, DefaultColormap(display, screen), &col);
+ gcv.foreground = col.pixel;
+ blueGC = XCreateGC(display, window, GCForeground, &gcv);
+ col.red = 65535;
+ col.green = 65535;
+ col.blue = 0;
+ XAllocColor(display, DefaultColormap(display, screen), &col);
+ gcv.foreground = col.pixel;
+ yellowGC = XCreateGC(display, window, GCForeground, &gcv);
+ col.red = 32767;
+ col.green = 32767;
+ col.blue = 0;
+ XAllocColor(display, DefaultColormap(display, screen), &col);
+ gcv.foreground = col.pixel;
+ dkyellowGC = XCreateGC(display, window, GCForeground, &gcv);
+ col.red = 65535;
+ col.green = 0;
+ col.blue = 0;
+ XAllocColor(display, DefaultColormap(display, screen), &col);
+ gcv.foreground = col.pixel;
+ redGC = XCreateGC(display, window, GCForeground, &gcv);
+ mon_init = 1;
+ }
+
+ if (mon_init)
+ {
+ if (show_mon)
+ XMapWindow(display, window);
+ else
+ XUnmapWindow(display, window);
+ XResizeWindow(display, window, prefs.buckets, 128 + 8);
+ XFlush(display);
+ }
+#endif
+}
+
+void CompressFree(void)
+{
+#ifdef USE_X
+ if (mon_init)
+ {
+ XFreeGC(display, blackGC);
+ XFreeGC(display, whiteGC);
+ XFreeGC(display, blueGC);
+ XFreeGC(display, yellowGC);
+ XFreeGC(display, dkyellowGC);
+ XFreeGC(display, redGC);
+ XDestroyWindow(display, window);
+ XCloseDisplay(display);
+ }
+#endif
+
+ if (peaks)
+ free(peaks);
+}
+
+void CompressDo(void *data, unsigned int length)
+{
+ int16_t *audio = (int16_t *)data, *ap;
+ int peak, pos;
+ int i;
+ int gr, gf, gn;
+ static int pn = -1;
+#ifdef STATS
+ static int clip = 0;
+#endif
+ static int clipped = 0;
+
+ if (!peaks)
+ return;
+
+ if (pn == -1)
+ {
+ for (i = 0; i < prefs.buckets; i++)
+ peaks[i] = 0;
+ }
+ pn = (pn + 1)%prefs.buckets;
+
+#ifdef DEBUG
+ fprintf(stderr, "modifyNative16(0x%08x, %d)\n",(unsigned int)data,
+ length);
+#endif
+
+ /* Determine peak's value and position */
+ peak = 1;
+ pos = 0;
+
+#ifdef DEBUG
+ fprintf(stderr, "finding peak(b=%d)\n", pn);
+#endif
+
+ ap = audio;
+ for (i = 0; i < length/2; i++)
+ {
+ int val = *ap;
+ if (val > peak)
+ {
+ peak = val;
+ pos = i;
+ } else if (-val > peak)
+ {
+ peak = -val;
+ pos = i;
+ }
+ ap++;
+ }
+ peaks[pn] = peak;
+
+ /* Only draw if needed, of course */
+#ifdef USE_X
+ if (prefs.show_mon)
+ {
+ /* current amplitude */
+ XDrawLine(display, window, whiteGC,
+ pn, 0,
+ pn,
+ 127 -
+ (peaks[pn]*gainCurrent >> (GAINSHIFT + 8)));
+
+ /* amplification */
+ XDrawLine(display, window, yellowGC,
+ pn,
+ 127 - (peaks[pn]*gainCurrent
+ >> (GAINSHIFT + 8)),
+ pn, 127);
+
+ /* peak */
+ XDrawLine(display, window, blackGC,
+ pn, 127 - (peaks[pn] >> 8), pn, 127);
+
+ /* clip indicator */
+ if (clipped)
+ XDrawLine(display, window, redGC,
+ (pn + prefs.buckets - 1)%prefs.buckets,
+ 126 - clipped/(length*512),
+ (pn + prefs.buckets - 1)%prefs.buckets,
+ 127);
+ clipped = 0;
+
+ // target line
+ //XDrawPoint(display, window, redGC,
+ // pn, 127 - TARGET/256);
+ // amplification edge
+ XDrawLine(display, window, dkyellowGC,
+ pn,
+ 127 - (peaks[pn]*gainCurrent
+ >> (GAINSHIFT + 8)),
+ pn - 1,
+ 127 -
+ (peaks[(pn + prefs.buckets
+ - 1)%prefs.buckets]*gainCurrent
+ >> (GAINSHIFT + 8)));
+ }
+#endif
+
+ for (i = 0; i < prefs.buckets; i++)
+ {
+ if (peaks[i] > peak)
+ {
+ peak = peaks[i];
+ pos = 0;
+ }
+ }
+
+ /* Determine target gain */
+ gn = (1 << GAINSHIFT)*prefs.target/peak;
+
+ if (gn <(1 << GAINSHIFT))
+ gn = 1 << GAINSHIFT;
+
+ gainTarget = (gainTarget *((1 << prefs.gainsmooth) - 1) + gn)
+ >> prefs.gainsmooth;
+
+ /* Give it an extra insignifigant nudge to counteract possible
+ ** rounding error
+ */
+
+ if (gn < gainTarget)
+ gainTarget--;
+ else if (gn > gainTarget)
+ gainTarget++;
+
+ if (gainTarget > prefs.gainmax << GAINSHIFT)
+ gainTarget = prefs.gainmax << GAINSHIFT;
+
+
+#ifdef USE_X
+ if (prefs.show_mon)
+ {
+ int x;
+
+ /* peak*gain */
+ XDrawPoint(display, window, redGC,
+ pn,
+ 127 - (peak*gainCurrent
+ >> (GAINSHIFT + 8)));
+
+ // gain indicator
+ XFillRectangle(display, window, whiteGC, 0, 128,
+ prefs.buckets, 8);
+ x = (gainTarget - (1 << GAINSHIFT))*prefs.buckets
+ / ((prefs.gainmax - 1) << GAINSHIFT);
+ XDrawLine(display, window, redGC, x,
+ 128, x, 128 + 8);
+
+ x = (gn - (1 << GAINSHIFT))*prefs.buckets
+ / ((prefs.gainmax - 1) << GAINSHIFT);
+
+ XDrawLine(display, window, blackGC,
+ x, 132 - 1,
+ x, 132 + 1);
+
+ // blue peak line
+ XDrawLine(display, window, blueGC,
+ 0, 127 - (peak >> 8), prefs.buckets,
+ 127 - (peak >> 8));
+ XFlush(display);
+ XDrawLine(display, window, whiteGC,
+ 0, 127 - (peak >> 8), prefs.buckets,
+ 127 - (peak >> 8));
+ }
+#endif
+
+ /* See if a peak is going to clip */
+ gn = (1 << GAINSHIFT)*32768/peak;
+
+ if (gn < gainTarget)
+ {
+ gainTarget = gn;
+
+ if (prefs.anticlip)
+ pos = 0;
+
+ } else
+ {
+ /* We're ramping up, so draw it out over the whole frame */
+ pos = length;
+ }
+
+ /* Determine gain rate necessary to make target */
+ if (!pos)
+ pos = 1;
+
+ gr = ((gainTarget - gainCurrent) << 16)/pos;
+
+ /* Do the shiznit */
+ gf = gainCurrent << 16;
+
+#ifdef STATS
+ fprintf(stderr, "\rgain = %2.2f%+.2e ",
+ gainCurrent*1.0/(1 << GAINSHIFT),
+ (gainTarget - gainCurrent)*1.0/(1 << GAINSHIFT));
+#endif
+
+ ap = audio;
+ for (i = 0; i < length/2; i++)
+ {
+ int sample;
+
+ /* Interpolate the gain */
+ gainCurrent = gf >> 16;
+ if (i < pos)
+ gf += gr;
+ else if (i == pos)
+ gf = gainTarget << 16;
+
+ /* Amplify */
+ sample = (*ap)*gainCurrent >> GAINSHIFT;
+ if (sample < -32768)
+ {
+#ifdef STATS
+ clip++;
+#endif
+ clipped += -32768 - sample;
+ sample = -32768;
+ } else if (sample > 32767)
+ {
+#ifdef STATS
+ clip++;
+#endif
+ clipped += sample - 32767;
+ sample = 32767;
+ }
+ *ap++ = sample;
+ }
+#ifdef STATS
+ fprintf(stderr, "clip %d b%-3d ", clip, pn);
+#endif
+
+#ifdef DEBUG
+ fprintf(stderr, "\ndone\n");
+#endif
+}
+
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