create_test_videofont.py

   1 #!/usr/bin/env python3
   2
   3 import sys
   4 import os
   5 import vidi
   6
   7 SAMPLE_LENGTH_SECONDS = 4
   8
   9 # 48000 samples per seconds, at 1024 samples per buffer
  10 NUM_AUDIO_BUFFERS = round(SAMPLE_LENGTH_SECONDS * 48000 / 1024)
  11
  12 LIVE_PIPELINE_TEMPLATE = """
  13   videotestsrc num-buffers=1 pattern=black ! \
  14           textoverlay valignment=center halignment=center font-desc="Sans, 72" text="{0}" ! \
  15           autovideosink \
  16   audiotestsrc num-buffers=%d freq={1:f} ! audio/x-raw,rate=48000 ! \
  17           autoaudiosink
  18 """ % NUM_AUDIO_BUFFERS
  19
  20 #FONT_DESC = "Andale Mono, 72"
  21 FONT_DESC = "Mono, 72"
  22
  23 FILE_PIPELINE_TEMPLATE = """
  24   matroskamux name=mux ! filesink location="{2}/sample_{0}.mkv"
  25   videotestsrc num-buffers=1 pattern=black ! \
  26           textoverlay valignment=center halignment=center font-desc="%s" text="{0}" ! \
  27           queue ! schroenc rate-control=3 ! mux.
  28   audiotestsrc num-buffers=%d freq={1:f} ! audio/x-raw,rate=48000 ! \
  29           queue ! audioconvert ! vorbisenc quality=0.5 ! queue ! mux.
  30 """ % (FONT_DESC, NUM_AUDIO_BUFFERS)
  31
  32
  33 def create_test_videofont(pipeline_template, notes_range, destination_dir=None):
  34     for i, note_number in enumerate(notes_range):
  35         note = vidi.SpnNote(note_number)
  36
  37         print("%2d %s" % (i, note))
  38
  39         pipeline_string = pipeline_template.format(note.name, note.frequency, destination_dir)
  40
  41         player = vidi.Player.from_pipeline_string(pipeline_string)
  42         error = player.play()
  43         if error:
  44             break
  45
  46
  47 def usage():
  48     print("usage: %s [<videofont_destination_dir>]" %
  49           os.path.basename(sys.argv[0]))
  50
  51
  52 def main():
  53     if len(sys.argv) > 1 and sys.argv[1] in ["-h", "--help"]:
  54         usage()
  55         return 0
  56
  57     notes_range = vidi.PIANO_88_KEYS_RANGE
  58
  59     if len(sys.argv) > 1:
  60         destination_dir = os.path.realpath(sys.argv[1])
  61         if os.path.exists(destination_dir):
  62             sys.stderr.write("The destination already exists '%s'!\n"
  63                              % destination_dir)
  64             return 1
  65
  66         os.mkdir(destination_dir)
  67         create_test_videofont(FILE_PIPELINE_TEMPLATE, notes_range,
  68                               destination_dir)
  69     else:
  70         create_test_videofont(LIVE_PIPELINE_TEMPLATE, notes_range)
  71
  72
  73 if __name__ == "__main__":
  74     sys.exit(main())