add Basic support for Smooth Streaming protocol(#8118)

1 files changed, 101 insertions, 0 deletions

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 68b325fca..2e9f05ae3 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -1780,6 +1780,107 @@ class InfoExtractor(object):
                         self.report_warning('Unknown MIME type %s in DASH manifest' % mime_type)
         return formats
 
+    def _extract_ism_formats(self, ism_url, video_id, ism_id=None, note=None, errnote=None, fatal=True):
+        res = self._download_webpage_handle(
+            ism_url, video_id,
+            note=note or 'Downloading ISM manifest',
+            errnote=errnote or 'Failed to download ISM manifest',
+            fatal=fatal)
+        if res is False:
+            return []
+        ism, urlh = res
+
+        return self._parse_ism_formats(
+            compat_etree_fromstring(ism.encode('utf-8')), urlh.geturl(), ism_id)
+
+    def _parse_ism_formats(self, ism_doc, ism_url, ism_id=None):
+        if ism_doc.get('IsLive') == 'TRUE' or ism_doc.find('Protection') is not None:
+            return []
+
+        ism_base_url = re.match(r'https?://.+/', ism_url).group()
+
+        duration = int(ism_doc.attrib['Duration'])
+        timescale = int_or_none(ism_doc.get('TimeScale')) or 10000000
+
+        formats = []
+        for stream in ism_doc.findall('StreamIndex'):
+            stream_type = stream.get('Type')
+            if stream_type not in ('video', 'audio'):
+                continue
+            url_pattern = stream.attrib['Url']
+            stream_timescale = int_or_none(stream.get('TimeScale')) or timescale
+            stream_name = stream.get('Name')
+            for track in stream.findall('QualityLevel'):
+                fourcc = track.get('FourCC')
+                # TODO: add support for WVC1 and WMAP
+                if fourcc not in ('H264', 'AVC1', 'AACL'):
+                    self.report_warning('%s is not a supported codec' % fourcc)
+                    continue
+                tbr = int(track.attrib['Bitrate']) // 1000
+                width = int_or_none(track.get('MaxWidth'))
+                height = int_or_none(track.get('MaxHeight'))
+                sampling_rate = int_or_none(track.get('SamplingRate'))
+
+                track_url_pattern = re.sub(r'{[Bb]itrate}', track.attrib['Bitrate'], url_pattern)
+                track_url_pattern = compat_urlparse.urljoin(ism_url, track_url_pattern)
+
+                fragments = []
+                fragment_ctx = {
+                    'time': 0,
+                }
+                stream_fragments = stream.findall('c')
+                for stream_fragment_index, stream_fragment in enumerate(stream_fragments):
+                    fragment_ctx['time'] = int_or_none(stream_fragment.get('t')) or fragment_ctx['time']
+                    fragment_repeat = int_or_none(stream_fragment.get('r')) or 1
+                    fragment_ctx['duration'] = int_or_none(stream_fragment.get('d'))
+                    if not fragment_ctx['duration']:
+                        try:
+                            next_fragment_time = int(stream_fragment[stream_fragment_index + 1].attrib['t'])
+                        except IndexError:
+                            next_fragment_time = duration
+                        fragment_ctx['duration'] = (next_fragment_time - frgament_time) / fragment_repeat
+                    for _ in range(fragment_repeat):
+                        fragments.append({
+                            'url': re.sub(r'{start[ _]time}', str(fragment_ctx['time']), track_url_pattern),
+                            'duration': fragment_ctx['duration'] / stream_timescale,
+                        })
+                        fragment_ctx['time'] += fragment_ctx['duration']
+
+                format_id = []
+                if ism_id:
+                    format_id.append(ism_id)
+                if stream_name:
+                    format_id.append(stream_name)
+                format_id.append(compat_str(tbr))
+
+                formats.append({
+                    'format_id': '-'.join(format_id),
+                    'url': ism_url,
+                    'manifest_url': ism_url,
+                    'ext': 'ismv' if stream_type == 'video' else 'isma',
+                    'width': width,
+                    'height': height,
+                    'tbr': tbr,
+                    'asr': sampling_rate,
+                    'vcodec': 'none' if stream_type == 'audio' else fourcc,
+                    'acodec': 'none' if stream_type == 'video' else fourcc,
+                    'protocol': 'ism',
+                    'fragments': fragments,
+                    '_download_params': {
+                        'duration': duration,
+                        'timescale': stream_timescale,
+                        'width': width or 0,
+                        'height': height or 0,
+                        'fourcc': fourcc,
+                        'codec_private_data': track.get('CodecPrivateData'),
+                        'sampling_rate': sampling_rate,
+                        'channels': int_or_none(track.get('Channels', 2)),
+                        'bits_per_sample': int_or_none(track.get('BitsPerSample', 16)),
+                        'nal_unit_length_field': int_or_none(track.get('NALUnitLengthField', 4)),
+                    },
+                })
+        return formats
+
     def _parse_html5_media_entries(self, base_url, webpage, video_id, m3u8_id=None, m3u8_entry_protocol='m3u8'):
         def absolute_url(video_url):
             return compat_urlparse.urljoin(base_url, video_url)