CURL CDVDInputStreamFFmpeg::GetM3UBestBandwidthStream(const CURL &url, size_t bandwidth)
{
typedef CPlayListM3U M3U;
using std::string;
using std::map;
// we may be passed a playlist that does not contain playlists of different
// bitrates (eg: this playlist is really the HLS video). So, default the
// return to the filename so it can be played
char szLine[4096];
string strLine;
size_t maxBandwidth = 0;
CCurlFile file;
// set the proxy configuration
const string host = GetProxyHost();
if (!host.empty())
file.SetProxy(GetProxyType(), host, GetProxyPort(),
GetProxyUser(), GetProxyPassword());
// open the file, and if it fails, return
if (!file.Open(url))
{
file.Close();
return url;
}
// and set the fallback value
CURL subStreamUrl(url);
// determine the base
CURL basePlaylistUrl(URIUtils::GetParentPath(url.Get()));
basePlaylistUrl.SetOptions("");
basePlaylistUrl.SetProtocolOptions("");
const string basePart = basePlaylistUrl.Get();
// convert bandwidth specified in kbps to bps used by the m3u8
bandwidth *= 1000;
while (file.ReadString(szLine, 1024))
{
// read and trim a line
strLine = szLine;
StringUtils::Trim(strLine);
// skip the first line
if (strLine == M3U::StartMarker)
continue;
else if (StringUtils::StartsWith(strLine, M3U::StreamMarker))
{
// parse the line so we can pull out the bandwidth
const map< string, string > params = M3U::ParseStreamLine(strLine);
const map< string, string >::const_iterator it = params.find(M3U::BandwidthMarker);
if (it != params.end())
{
const size_t streamBandwidth = atoi(it->second.c_str());
if ((maxBandwidth < streamBandwidth) && (streamBandwidth <= bandwidth))
{
// read the next line
if (!file.ReadString(szLine, 1024))
continue;
strLine = szLine;
StringUtils::Trim(strLine);
// this line was empty
if (strLine.empty())
continue;
// store the max bandwidth
maxBandwidth = streamBandwidth;
// if the path is absolute just use it
if (CURL::IsFullPath(strLine))
subStreamUrl = CURL(strLine);
else
subStreamUrl = CURL(basePart + strLine);
}
}
}
}
// if any protocol options were set, restore them
subStreamUrl.SetProtocolOptions(url.GetProtocolOptions());
return subStreamUrl;
}
