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store less data from sync signal

pull/1/merge
Oona 2011-08-17 19:33:04 +03:00
rodzic 9cecba8a35
commit 248c424391
2 zmienionych plików z 15 dodań i 34 usunięć
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30
sync.c
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@ -27,10 +27,8 @@ guint FindSync (guint Length, guchar Mode, guint Rate, int *Skip) {
gboolean SyncImg[700][630];
double NextImgSample, t=0, slantAngle;
printf("len %d\n",Length);
// Repeat until slant < 0.5° or until we give up
while (1) {
while (TRUE) {
TotPix = LineWidth/2; // Start at the middle of the picture
NextImgSample = 0;
t = 0;
@ -39,26 +37,12 @@ guint FindSync (guint Length, guchar Mode, guint Rate, int *Skip) {
memset(SyncImg, FALSE, sizeof(SyncImg[0][0]) * 700 * 630);
// Draw the sync signal into memory
for (s = 0; s < Length; s++) {
// Draw the 2D sync signal at current rate
// t keeps track of time in seconds
t += 1.0/Rate;
if (t >= NextImgSample) {
SyncImg[x][y] = HasSync[s];
if (y > maxsy) maxsy = y;
TotPix++;
x++;
if (x >= LineWidth) {
y++;
x=0;
}
NextImgSample += ModeSpec[Mode].LineLen / (1.0 * LineWidth);
for (y=0; y<ModeSpec[Mode].ImgHeight; y++) {
for (x=0; x<LineWidth; x++) {
t = y * ModeSpec[Mode].LineLen + 1.0*x/LineWidth * ModeSpec[Mode].LineLen;
SyncImg[x][y] = HasSync[ (int)(t / 1.5e-3 * Rate/44100) ];
}
}
@ -69,7 +53,7 @@ guint FindSync (guint Length, guchar Mode, guint Rate, int *Skip) {
memset(lines, 0, sizeof(lines[0][0]) * (MAXSLANT-MINSLANT)*2 * 600);
// Find white pixels
for (cy = 0; cy < TotPix / LineWidth; cy++) {
for (cy = 0; cy < ModeSpec[Mode].ImgHeight; cy++) {
for (cx = 0; cx < LineWidth; cx++) {
if (SyncImg[cx][cy]) {

19
video.c
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@ -20,6 +20,7 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
guint MaxBin = 0;
guint VideoPlusNoiseBins=0, ReceiverBins=0, NoiseOnlyBins=0;
guint n=0;
guint SyncSample;
int i=0, j=0,TargetBin=0;
int Length=0, Sample=0;
int FFTLen=1024, WinLength=0;
@ -38,7 +39,6 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
double ChanStart[4] = {0}, ChanLen[4] = {0};
guchar Lum=0, Image[800][616][3] = {{{0}}};
guchar Channel = 0;
gboolean PrevHasSync;
// Initialize Hann windows of different lengths
for (j = 0; j < 7; j++)
@ -101,9 +101,7 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
Length = ModeSpec[Mode].LineLen * ModeSpec[Mode].ImgHeight * 44100;
Abort = FALSE;
PrevHasSync = FALSE;
printf("pcmpointer %d\n",PcmPointer);
SyncSample = 0;
// Loop through signal
for (Sample = 0; Sample < Length; Sample++) {
@ -136,7 +134,8 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
memset(in, 0, sizeof(in[0]) *FFTLen);
memset(out, 0, sizeof(out[0])*FFTLen);
// Hann window
for (i = 0; i < 64; i++) in[i] = PcmBuffer[PcmPointer+i-32] / 32768.0 * Hann[0][i];
fftw_execute(Plan1024);
@ -151,15 +150,12 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
// If there is more than twice the amount of power per Hz in the
// sync band than in the rest of the band, we have a sync signal here
if (Psync > 2*Praw) HasSync[Sample] = TRUE;
else HasSync[Sample] = FALSE;
PrevHasSync = HasSync[Sample];
if (Psync > 2*Praw) HasSync[SyncSample] = TRUE;
else HasSync[SyncSample] = FALSE;
NextSyncTime += 1.5e-3;
SyncSample ++;
} else {
HasSync[Sample] = PrevHasSync;
}
@ -230,6 +226,7 @@ gboolean GetVideo(guchar Mode, guint Rate, int Skip, gboolean Redraw) {
}
// Halve the window size for M2 and S2, except under excellent or hopeless SNR
// FIXME: nonsensic hack
if ( (Mode == M2 || Mode == S2) && WinLength > 64 && WinLength < 512) {
WinLength /= 2;
WinIdx --;