Implemented VCR capture using forward slow instead of stepping.

Also added a 'rate' field to specify the capture rate in this case.

diff --git a/Demo/sgi/video/Vb.py b/Demo/sgi/video/Vb.py
index e6fecdfd1850654dbf0aac55b4eaa287228e4c59..0a0ced1b6c47fb8ba3e97d885ad6dfa390f5677a 100755 (executable)
--- a/Demo/sgi/video/Vb.py
+++ b/Demo/sgi/video/Vb.py
@@ -118,7 +118,7 @@ class VideoBagOfTricks:
                self.in_maxmem.set_input('1.0')
                self.in_nframes.set_input('0')
                self.in_nframes_vcr.set_input('1')
-               self.in_sleeptime.set_input('1.0')
+               self.in_rate_vcr.set_input('1')
                # Audio defaults
                self.aout = None
                self.aport = None
@@ -200,6 +200,13 @@ class VideoBagOfTricks:
        def reset(self):
                self.close_video()
                self.close_audio()
+               if self.vcr:
+                       try:
+                               ok = self.vcr.still()
+                       except VCR.error:
+                               pass
+                       self.vcr = None
+               self.b_capture.set_button(0)
 
        # Event handler (catches resize of video window)
 
@@ -277,7 +284,7 @@ class VideoBagOfTricks:
        def cb_nframes_vcr(self, *args):
                pass
 
-       def cb_sleeptime(self, *args):
+       def cb_rate_vcr(self, *args):
                pass
 
        # Audio controls: format, file
@@ -319,6 +326,7 @@ class VideoBagOfTricks:
                self.reset()
 
        def cb_play(self, *args):
+               self.reset()
                sts = os.system('Vplay -q ' + self.vfile + ' &')
 
        def cb_quit(self, *args):
@@ -411,7 +419,9 @@ class VideoBagOfTricks:
                self.stop_audio()
                self.capturing = 0
                self.end_cont()
-               self.reset()
+               if self.aout:
+                       # If recording audio, can't capture multiple sequences
+                       self.reset()
                self.b_capture.label = saved_label
 
        def single_capture(self):
@@ -436,22 +446,66 @@ class VideoBagOfTricks:
                        try:
                                self.vcr = VCR.VCR().init()
                                self.vcr.wait()
-                               self.vcr.fmmode('dnr')
+                               if not (self.vcr.fmmode('dnr') and \
+                                         self.vcr.dmcontrol('digital slow')):
+                                       self.vcr_error('digital slow failed')
+                                       return
                        except VCR.error, msg:
                                self.vcr = None
-                               self.b_capture.set_button(0)
-                               fl.show_message('VCR error', str(msg), '')
+                               self.vcr_error(msg)
                                return
-               count = self.getint(self.in_nframes_vcr, 1)
-               if count <= 0: count = 1
-               sleeptime = self.getfloat(self.in_sleeptime, 1.0)
-               for i in range(count):
-                       if i > 0:
-                               time.sleep(sleeptime)
-                       if not self.single_capture():
-                               break
-                       if not self.vcr.step():
+               if not self.vcr.still():
+                       self.vcr_error('still failed')
+                       return
+               # XXX for some reason calling where() too often hangs the VCR,
+               # XXX so we insert sleep(0.1) before every sense() call.
+               self.open_if_closed()
+               rate = self.getint(self.in_rate_vcr, 1)
+               rate = max(rate, 1)
+               self.speed_factor = rate
+               addr = self.vcr.sense()
+               if not self.single_capture():
+                       return
+               print 'captured %02d:%02d:%02d:%02d' % self.vcr.addr2tc(addr)
+               count = self.getint(self.in_nframes_vcr, 1) - 1
+               if count <= 0:
+                       while rate > 0:
+                               if not self.vcr.step():
+                                       self.vcr_error('step failed')
+                               here = self.vcr.sense()
+                               if here > addr:
+                                       rate = rate - (here - addr)
+                               addr = here
+                       return
+               if not self.vcr.fwdshuttle(2):  # one tenth speed
+                       self.vcr_error('fwd shuttle failed')
+                       return
+               cycle = 0
+               while count > 0:
+                       time.sleep(0.1)
+                       try:
+                               here = self.vcr.sense()
+                       except VCR.error, msg:
+                               self.vcr_error(msg)
                                break
+                       if here <> addr:
+                               if here <> addr+1:
+                                       print 'Missed', here-addr-1,
+                                       print 'frame' + 's'*(here-addr-1 <> 1)
+                               cycle = (cycle+1) % rate
+                               if cycle == 0:
+                                       if not self.single_capture():
+                                               break
+                                       print 'captured %02d:%02d:%02d:%02d' \
+                                                 % self.vcr.addr2tc(here)
+                                       count = count -1
+                               addr = here
+               if self.vcr and not self.vcr.still():
+                       self.vcr_error('still failed')
+
+       def vcr_error(self, msg):
+               self.reset()
+               fl.show_message('VCR error:', str(msg), '')
 
        # Init/end continuous capture mode
 
@@ -551,12 +605,14 @@ class VideoBagOfTricks:
                vout.writeheader()
                self.vout = vout
                self.nframes = 0
+               self.speed_factor = 1
                self.t_nframes.label = `self.nframes`
 
        def write_frame(self, t, data):
+               t = t * self.speed_factor
                if not self.vout:
                        gl.ringbell()
-                       return
+                       return 0
                if self.convertor:
                        data = self.convertor(data, len(data), 1)
                elif self.mono:
@@ -570,6 +626,7 @@ class VideoBagOfTricks:
                try:
                        self.vout.writeframe(int(t), data, None)
                except IOError, msg:
+                       self.reset()
                        if msg == (0, 'Error 0'):
                                msg = 'disk full??'
                        fl.show_message('IOError', str(msg), '')

diff --git a/Demo/sgi/video/VbForm.fd b/Demo/sgi/video/VbForm.fd
index 1c0be3758c334ab2961aab9bc113bec95876025a..ef58488b870f4bd44524153e5afe2941ce2ccd2b 100644 (file)
--- a/Demo/sgi/video/VbForm.fd
+++ b/Demo/sgi/video/VbForm.fd
@@ -29,7 +29,7 @@ argument:
 --------------------
 class: 11
 type: 5
-box: 330.000000 170.000000 110.000015 60.000004
+box: 330.000000 130.000000 110.000015 60.000004
 boxtype: 1
 colors: 47 47
 alignment: 4
@@ -89,7 +89,7 @@ argument: 0
 --------------------
 class: 11
 type: 0
-box: 330.000000 90.000000 110.000000 30.000000
+box: 330.000000 200.000000 110.000000 30.000000
 boxtype: 1
 colors: 47 47
 alignment: 4
@@ -419,7 +419,7 @@ argument:
 --------------------
 class: 2
 type: 0
-box: 390.000000 130.000000 50.000000 30.000002
+box: 390.000000 90.000000 50.000000 30.000002
 boxtype: 2
 colors: 47 47
 alignment: 2
@@ -434,7 +434,7 @@ argument:
 --------------------
 class: 2
 type: 0
-box: 320.000000 130.000000 60.000000 30.000000
+box: 320.000000 90.000000 60.000000 30.000000
 boxtype: 0
 colors: 47 47
 alignment: 2
@@ -451,7 +451,7 @@ class: 10000
 type: 0
 box: 0.000000 0.000000 0.000000 0.000000
 boxtype: 0
-colors: 0 0
+colors: 1147496041 1852404841
 alignment: 4
 style: 0
 size: 11.000000
@@ -478,7 +478,7 @@ argument: 0
 
 --------------------
 class: 31
-type: 1
+type: 2
 box: 220.000000 170.000000 100.000000 30.000000
 boxtype: 2
 colors: 13 5
@@ -486,9 +486,9 @@ alignment: 0
 style: 0
 size: 11.000000
 lcol: 0
-label: Delay:
-name: in_sleeptime
-callback: cb_sleeptime
+label: Sample rate:
+name: in_rate_vcr
+callback: cb_rate_vcr
 argument: 0
 
 --------------------
@@ -496,7 +496,7 @@ class: 20000
 type: 0
 box: 0.000000 0.000000 0.000000 0.000000
 boxtype: 0
-colors: 0 0
+colors: 544171552 1331849829
 alignment: 4
 style: 0
 size: 11.000000