Created
September 15, 2015 01:11
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some sample code from a program that opens a web audio stream and records it to a file
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class Recorder: | |
def __init__(self): | |
self.log = logging.getLogger('capturadio.recorder') | |
self.start_time = None | |
def capture(self, show): | |
config = Configuration() | |
self.log.info(u'capture "%s" from "%s" for %s seconds to %s' %\ | |
(show.name, show.station.name, show.duration, config.destination)) | |
self.start_time = time.time() | |
file_name = u"%s/capturadio_%s.mp3" % (config.tempdir, os.getpid()) | |
try: | |
self._write_stream_to_file(show.get_stream_url(), file_name, show.duration) | |
time_string = format_date(config.date_pattern, time.localtime(self.start_time)) | |
target_file = u"%(station)s/%(show)s/%(show)s_%(time)s.mp3" %\ | |
{ 'station' : show.station.name, | |
'show': show.name, | |
'time': time_string, | |
} | |
target_file = os.path.join(config.destination, slugify(target_file)) | |
final_file_name = self._copy_file_to_destination(file_name, target_file) | |
self._add_metadata(show, final_file_name) | |
self.start_time = None | |
except Exception as e: | |
message = "Could not complete capturing, because an exception occured: %s" % e | |
self.log.error(message) | |
raise e | |
finally: | |
if os.path.exists(file_name): | |
os.remove(file_name) | |
def _write_stream_to_file(self, stream_url, file_name, duration): | |
not_ready = True | |
self.log.info("write %s to %s" % (stream_url, file_name)) | |
try: | |
file = open(file_name, 'w+b') | |
stream = urlopen(stream_url) | |
while not_ready: | |
file.write(stream.read(10240)) | |
if time.time() - self.start_time > duration: | |
not_ready = False | |
file.close() | |
except Exception as e: | |
message = "Could not capture show, because an exception occured: %s" % e.message | |
self.log.error("_write_stream_to_file: %s" % message) | |
os.remove(file_name) | |
raise e | |
def _copy_file_to_destination(self, file_name, target_file): | |
import shutil | |
if not os.path.isdir(os.path.dirname(target_file)): | |
os.makedirs(os.path.dirname(target_file)) | |
try: | |
shutil.copyfile(file_name, target_file) | |
self.log.info(u"file copied from %s to %s" % (file_name, target_file)) | |
return target_file | |
except IOError as e: | |
message = "Could not copy tmp file to %s: %s" % (target_file, e.message) | |
self.log.error("_copy_file_to_destination: %s" % message) | |
os.remove(file_name) | |
raise IOError(message, e) | |
def _add_metadata(self, show, file_name): | |
if file_name is None: | |
raise "file_name is not set - you cannot add metadata to None" | |
config = Configuration() | |
time_string = format_date(config.date_pattern, time.localtime(self.start_time)) | |
comment = config.comment_pattern % { | |
'show': show.name, | |
'date': time_string, | |
'year': time.strftime('%Y', time.gmtime()), | |
'station': show.station.name, | |
'link_url': show.get_link_url() | |
} | |
audio = ID3() | |
# See http://www.id3.org/id3v2.3.0 for details about the ID3 tags | |
audio.add(TIT2(encoding=2, text=["%s, %s" % (show.name, time_string)])) | |
audio.add(TDRC(encoding=2, text=[format_date('%Y-%m-%d %H:%M', self.start_time)])) | |
audio.add(TCON(encoding=2, text=[u'Podcast'])) | |
audio.add(TALB(encoding=2, text=[show.name])) | |
audio.add(TLEN(encoding=2, text=[show.duration * 1000])) | |
audio.add(TPE1(encoding=2, text=[show.station.name])) | |
audio.add(TCOP(encoding=2, text=[show.station.name])) | |
audio.add(COMM(encoding=2, lang='eng', desc='desc', text=comment)) | |
audio.add(TCOM(encoding=2, text=[show.get_link_url()])) | |
self._add_logo(show, audio) | |
audio.save(file_name) | |
def _add_logo(self, show, audio): | |
# APIC part taken from http://mamu.backmeister.name/praxis-tipps/pythonmutagen-audiodateien-mit-bildern-versehen/ | |
url = show.station.logo_url | |
if url is not None: | |
request = Request(url) | |
request.get_method = lambda: 'HEAD' | |
try: | |
response = urlopen(request) | |
logo_type = response.info().gettype() | |
if logo_type in ['image/jpeg', 'image/png']: | |
img_data = urlopen(url).read() | |
img = APIC( | |
encoding=3, # 3 is for utf-8 | |
mime=logo_type, | |
type=3, # 3 is for the cover image | |
desc=u'Station logo', | |
data=img_data | |
) | |
audio.add(img) | |
except (HTTPError, URLError) as e: | |
message = "Error during capturing %s - %s" % (url, e) | |
self.log.error(message) | |
except Exception as e: | |
raise e |
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