smooth-dl.py

   1 #!/usr/bin/env python
   2 #
   3 # smooth-dl - download videos served using Smooth Streaming technology
   4 #
   5 # Copyright (C) 2010  Antonio Ospite <ospite@studenti.unina.it>
   6 #
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 #
  20 #
  21 # TODO:
  22 #  - Handle HTTP errors:
  23 #       "Connection reset by peer"
  24 #       "Resource not  available"
  25 #       "Gateway Time-out"
  26 # - Support more Manifest formats:
  27 #       WaveFormatEx attribute instead of PrivateCodecdata
  28 #       'd' and other attributes in chunk element ('i', 's', 'q')
  29 #
  30 # basically, write a proper implementation of manifest parsing and chunk
  31 # downloading
  32
  33
  34 __description = "Download videos served using Smooth Streaming technology"
  35 __version = "0.x"
  36 __author_info = "Written by Antonio Ospite http://ao2.it"
  37
  38 import os
  39 import sys
  40 import xml.etree.ElementTree as etree
  41 import urllib2
  42 import struct
  43 import tempfile
  44 from optparse import OptionParser
  45
  46
  47 def get_chunk_data(data):
  48
  49     moof_size = struct.unpack(">L", data[0:4])[0]
  50     mdat_size = struct.unpack(">L", data[moof_size:moof_size + 4])[0]
  51
  52     data_start = moof_size + 4 + len('mdat')
  53     data_size = mdat_size - 4 - len('mdat')
  54
  55     #print len(data[data_start:]), \
  56     #        len(data[data_start:data_start + data_size]), data_size
  57
  58     assert(len(data[data_start:]) == data_size)
  59
  60     return data[data_start:data_start + data_size]
  61
  62
  63 def hexstring_to_bytes(hex_string):
  64     res = ""
  65     for i in range(0, len(hex_string), 2):
  66             res += chr(int(hex_string[i:i + 2], 16))
  67
  68     return res
  69
  70
  71 def write_wav_header(out_file, fmt, codec_private_data, data_len):
  72
  73     extradata = hexstring_to_bytes(codec_private_data)
  74
  75     fmt['cbSize'] = len(extradata)
  76     fmt_len = 18 + fmt['cbSize']
  77     wave_len = len("WAVEfmt ") + 4 + fmt_len + len('data') + 4
  78
  79     out_file.write("RIFF")
  80     out_file.write(struct.pack('<L', wave_len))
  81     out_file.write("WAVEfmt ")
  82     out_file.write(struct.pack('<L', fmt_len))
  83     out_file.write(struct.pack('<H', fmt['wFormatTag']))
  84     out_file.write(struct.pack('<H', fmt['nChannels']))
  85     out_file.write(struct.pack('<L', fmt['nSamplesPerSec']))
  86     out_file.write(struct.pack('<L', fmt['nAvgBytesPerSec']))
  87     out_file.write(struct.pack('<H', fmt['nBlockAlign']))
  88     out_file.write(struct.pack('<H', fmt['wBitsPerSample']))
  89     out_file.write(struct.pack('<H', fmt['cbSize']))
  90     out_file.write(extradata)
  91     out_file.write("data")
  92     out_file.write(struct.pack('<L', data_len))
  93
  94
  95 def get_manifest(base_url, dest_dir=tempfile.gettempdir()):
  96     """Returns the manifest and the new URL if this is changed"""
  97
  98     if os.path.exists(dest_dir) == False:
  99         os.mkdir(dest_dir, 0755)
 100
 101     if base_url.startswith('http://'):
 102
 103         manifest_url = base_url
 104         if not manifest_url.lower().endswith(('/manifest', '.ismc', '.csm')):
 105             manifest_url += '/Manifest'
 106
 107         response = urllib2.urlopen(manifest_url)
 108         data = response.read()
 109
 110         manifest_path = os.path.join(dest_dir, 'Manifest')
 111         f = open(manifest_path, "w")
 112         f.write(data)
 113         f.close()
 114     else:
 115         manifest_path = base_url
 116
 117     manifest = etree.parse(manifest_path)
 118
 119     version = manifest.getroot().attrib['MajorVersion']
 120     if version != "2":
 121         raise Exception('Only Smooth Streaming version 2 supported')
 122
 123     try:
 124         # if some intermediate client Manifest is used, like in Rai Replay
 125         clip = manifest.find("Clip")
 126         actual_manifest_url = clip.attrib["Url"]
 127         base_url = actual_manifest_url.lower().replace("/manifest", "")
 128     except:
 129         pass
 130
 131     return (manifest, base_url)
 132
 133
 134 def print_manifest_info(manifest):
 135
 136     streams = manifest.findall('.//StreamIndex')
 137
 138     for i, s in enumerate(streams):
 139         stream_type = s.attrib["Type"]
 140         url = s.attrib["Url"]
 141
 142         print "Stream: %s Type: %s" % (i, stream_type)
 143
 144         print "\tQuality Levels:"
 145         qualities = s.findall("QualityLevel")
 146         for i, q in enumerate(qualities):
 147             bitrate = q.attrib["Bitrate"]
 148             fourcc = q.attrib["FourCC"]
 149
 150             if stream_type == "video":
 151                 size = "%sx%s" % (q.attrib["MaxWidth"], q.attrib["MaxHeight"])
 152                 print "\t%2s: %4s %10s @ %7s bps" % (i, fourcc, size, bitrate)
 153             if stream_type == "audio":
 154                 channels = q.attrib["Channels"]
 155                 sampling_rate = q.attrib["SamplingRate"]
 156                 bits_per_sample = q.attrib["BitsPerSample"]
 157                 print "\t%2s: %4s %sHz %sbits %sch @ %7s bps" % (i, fourcc,
 158                         sampling_rate, bits_per_sample, channels, bitrate)
 159
 160     print
 161
 162
 163 def get_chunk_quality_string(stream, quality_level):
 164     quality = stream.findall("QualityLevel")[quality_level]
 165     bitrate = quality.attrib["Bitrate"]
 166
 167     quality_attributes = quality.findall("CustomAttributes/Attribute")
 168     custom_attributes = ""
 169     for i in quality_attributes:
 170         custom_attributes += "%s=%s," % (i.attrib["Name"], i.attrib["Value"])
 171     custom_attributes = custom_attributes.rstrip(',')
 172
 173     # Assume URLs are in this form:
 174     # Url="QualityLevels({bitrate})/Fragments(video={start time})"
 175     # or
 176     # Url="QualityLevels({bitrate},{CustomAttributes})/Fragments(video={start time})"
 177     url = stream.attrib["Url"]
 178
 179     chunks_quality = url.split('/')[0].replace("{bitrate}", bitrate)
 180     chunks_quality = chunks_quality.replace("{CustomAttributes}", custom_attributes)
 181
 182     return chunks_quality
 183
 184
 185 def get_chunk_name_string(stream, chunk):
 186     t = chunk.attrib["t"]
 187     url = stream.attrib["Url"]
 188     chunk_name = url.split('/')[1].replace("{start time}", t)
 189
 190     return chunk_name
 191
 192
 193 def download_chunks(base_url, manifest, stream_index, quality_level, dest_dir):
 194
 195     if os.path.exists(dest_dir) == False:
 196         os.mkdir(dest_dir, 0755)
 197
 198     stream = manifest.findall('.//StreamIndex')[stream_index]
 199
 200     chunks_quality = get_chunk_quality_string(stream, quality_level)
 201
 202     chunks_dest_dir = os.path.join(dest_dir, chunks_quality)
 203     if os.path.exists(chunks_dest_dir) == False:
 204         os.mkdir(chunks_dest_dir, 0755)
 205
 206     chunks = stream.findall("c")
 207     data_size = 0
 208     print "\nDownloading Stream %d" % stream_index
 209     print "\tChunks %10d/%-10d" % (0, len(chunks)), "\r",
 210     sys.stdout.flush()
 211     for i, c in enumerate(chunks):
 212
 213         chunk_name = get_chunk_name_string(stream, c)
 214         chunk_file = os.path.join(dest_dir,  chunks_quality, chunk_name)
 215
 216         if os.path.exists(chunk_file) == False:
 217             chunk_url = base_url + '/' + chunks_quality + '/' + chunk_name
 218             response = urllib2.urlopen(chunk_url)
 219             data = response.read()
 220
 221             f = open(chunk_file, "wb")
 222             f.write(data)
 223             f.close()
 224         else:
 225             f = open(chunk_file, "rb")
 226             data = f.read()
 227             f.close()
 228
 229         data_size += len(data)
 230         print "\tChunks %10d/%-10d" % (i + 1, len(chunks)), "\r",
 231         sys.stdout.flush()
 232     print "\tDownloaded size:", data_size
 233
 234
 235 def rebuild_stream(manifest, stream_index, quality_level, src_dir,
 236         dest_file_name, final_dest_file=None):
 237
 238     if final_dest_file == None:
 239         final_dest_file = dest_file_name
 240
 241     stream = manifest.findall('.//StreamIndex')[stream_index]
 242
 243     chunks_quality = get_chunk_quality_string(stream, quality_level)
 244
 245     chunks_src_dir = os.path.join(src_dir, chunks_quality)
 246
 247     dest_file = open(dest_file_name, "wb")
 248
 249     chunks = stream.findall("c")
 250     data_size = 0
 251     print "\nRebuilding Stream %d" % stream_index
 252     print "\tChunks %10d/%-10d" % (0, len(chunks)), "\r",
 253     sys.stdout.flush()
 254     for i, c in enumerate(chunks):
 255
 256         chunk_name = get_chunk_name_string(stream, c)
 257         chunk_file = os.path.join(chunks_src_dir, chunk_name)
 258
 259         f = open(chunk_file, "rb")
 260         data = get_chunk_data(f.read())
 261         f.close()
 262         dest_file.write(data)
 263         data_size += len(data)
 264         print "\tChunks %10d/%-10d" % (i + 1, len(chunks)), "\r",
 265         sys.stdout.flush()
 266
 267     # Add a nice WAV header
 268     if stream.attrib['Type'] == "audio":
 269         quality = stream.findall("QualityLevel")[quality_level]
 270         codec_private_data = quality.attrib['CodecPrivateData']
 271
 272         fmt = {}
 273         fmt['wFormatTag'] = int(quality.attrib['AudioTag'])
 274         fmt['nChannels'] = int(quality.attrib['Channels'])
 275         fmt['nSamplesPerSec'] = int(quality.attrib['SamplingRate'])
 276         fmt['nAvgBytesPerSec'] = int(quality.attrib['Bitrate']) / 8
 277         fmt['wBitsPerSample'] = int(quality.attrib['BitsPerSample'])
 278         fmt['nBlockAlign'] = int(quality.attrib['PacketSize'])
 279         fmt['cbSize'] = 0
 280
 281         f = open(final_dest_file, "wb")
 282         write_wav_header(f, fmt, codec_private_data, data_size)
 283         dest_file.close()
 284         dest_file = open(dest_file_name, "rb")
 285         f.write(dest_file.read())
 286         f.close()
 287         dest_file.close()
 288
 289     print
 290     print "Stream %d, actual data size: %d\n" % (stream_index, data_size)
 291
 292
 293 def calc_tracks_delay(manifest, stream1_index, stream2_index):
 294     streams = manifest.findall('.//StreamIndex')
 295
 296     s1 = streams[stream1_index]
 297     s2 = streams[stream2_index]
 298
 299     s1_start_chunk = s1.find("c")
 300     s2_start_chunk = s2.find("c")
 301
 302     s1_start_time = int(s1_start_chunk.attrib['t'])
 303     s2_start_time = int(s2_start_chunk.attrib['t'])
 304
 305     s1_timescale = float(s1.attrib['TimeScale'])
 306     s2_timescale = float(s2.attrib['TimeScale'])
 307
 308     # calc difference in seconds
 309     delay = s2_start_time / s2_timescale - \
 310             s1_start_time / s1_timescale
 311
 312     return delay
 313
 314
 315 def get_clip_duration(manifest):
 316     # TODO: use <Clip ClipBegin="" ClipEnd=""> if Duration is not available
 317     duration = manifest.getroot().attrib['Duration']
 318
 319     return float(duration) / 10000000  # here is the default timescale
 320
 321
 322 def smooth_download(url, manifest, dest_dir=tempfile.gettempdir(),
 323         video_stream_index=0, audio_stream_index=1,
 324         video_quality_level=0, audio_quality_level=0,
 325         chunks_dir=None, download=True,
 326         out_video_file='_video.vc1', out_audio_file='_audio.raw'):
 327
 328         if chunks_dir == None:
 329             chunks_dir = dest_dir
 330
 331         if download:
 332             download_chunks(url, manifest, video_stream_index,
 333                     video_quality_level, chunks_dir)
 334             download_chunks(url, manifest, audio_stream_index,
 335                     audio_quality_level, chunks_dir)
 336
 337         dest_video = os.path.join(dest_dir, out_video_file)
 338         dest_audio = os.path.join(dest_dir, out_audio_file)
 339
 340         rebuild_stream(manifest, video_stream_index, video_quality_level,
 341                 chunks_dir, dest_video)
 342         rebuild_stream(manifest, audio_stream_index, audio_quality_level,
 343                 chunks_dir, dest_audio, dest_audio + '.wav')
 344
 345         #duration = get_clip_duration(manifest)
 346
 347         delay = calc_tracks_delay(manifest, video_stream_index,
 348                 audio_stream_index)
 349
 350         # optionally encode audio to vorbis:
 351         # ffmpeg -i _audio.raw.wav -acodec libvorbis -aq 60 audio.ogg
 352         mux_command = ("ffmpeg -i %s \\\n" +
 353                       "  -itsoffset %f -async 1 -i %s \\\n" +
 354                       "  -vcodec copy -acodec copy ffout.mkv") % \
 355                       (dest_video, delay, dest_audio + '.wav')
 356
 357         print mux_command
 358
 359
 360 def options_parser():
 361     version = "%%prog %s" % __version
 362     usage = "usage: %prog [options] <manifest URL or file>"
 363     parser = OptionParser(usage=usage, version=version,
 364             description=__description, epilog=__author_info)
 365     parser.add_option("-i", "--info",
 366                       action="store_true", dest="info_only",
 367                       default=False, help="print Manifest info and exit")
 368     parser.add_option("-m", "--manifest-only",
 369                       action="store_true", dest="manifest_only",
 370                       default=False, help="download Manifest file and exit")
 371     parser.add_option("-n", "--no-download",
 372                       action="store_false", dest="download",
 373                       default=True, help="disable downloading chunks")
 374     parser.add_option("-s", "--sync-delay",
 375                       action="store_true", dest="sync_delay",
 376                       default=False, help="show the sync delay between the given streams and exit")
 377     parser.add_option("-d", "--dest-dir", metavar="<dir>",
 378                       dest="dest_dir", default=tempfile.gettempdir(),
 379                       help="destination directory")
 380     parser.add_option("-c", "--chunks-dir", metavar="<dir>",
 381                       dest="chunks_dir", default=None,
 382                       help="directory containing chunks, if different from destination dir")
 383     parser.add_option("-v", "--video-stream",  metavar="<n>",
 384                       type="int", dest="video_stream_index", default=0,
 385                       help="index of the video stream")
 386     parser.add_option("-a", "--audio-stream", metavar="<n>",
 387                       type="int", dest="audio_stream_index", default=1,
 388                       help="index of the audio stream")
 389     parser.add_option("-q", "--video-quality", metavar="<n>",
 390                       type="int", dest="video_quality_level", default=0,
 391                       help="index of the video quality level")
 392     parser.add_option("-Q", "--audio-quality", metavar="<n>",
 393                       type="int", dest="audio_quality_level", default=0,
 394                       help="index of the audio quality level")
 395
 396     return parser
 397
 398
 399 if __name__ == "__main__":
 400
 401     parser = options_parser()
 402     (options, args) = parser.parse_args()
 403
 404     if len(args) != 1:
 405         parser.print_help()
 406         parser.exit(1)
 407
 408     url = args[0]
 409     manifest, url = get_manifest(url, options.dest_dir)
 410
 411     if options.manifest_only:
 412         parser.exit(0)
 413
 414     if options.sync_delay:
 415         print calc_tracks_delay(manifest,
 416                 options.video_stream_index,
 417                 options.audio_stream_index)
 418         parser.exit(0)
 419
 420     if options.info_only:
 421         print_manifest_info(manifest)
 422         parser.exit(0)
 423
 424     print_manifest_info(manifest)
 425
 426     smooth_download(url, manifest, options.dest_dir,
 427             options.video_stream_index, options.audio_stream_index,
 428             options.video_quality_level, options.audio_quality_level,
 429             options.chunks_dir, options.download)