| /********** |
| This library is free software; you can redistribute it and/or modify it under |
| the terms of the GNU Lesser General Public License as published by the |
| Free Software Foundation; either version 3 of the License, or (at your |
| option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
| |
| This library is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this library; if not, write to the Free Software Foundation, Inc., |
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| **********/ |
| // "liveMedia" |
| // Copyright (c) 1996-2020 Live Networks, Inc. All rights reserved. |
| // A class that implements a database that can be accessed to create |
| // "FramedFilter" (subclass) objects that transcode one codec into another. |
| // The implementation of this class just returns NULL for each codec lookup; |
| // To actually implement transcoding, you would subclass it. |
| // C++ header |
| |
| #ifndef _MEDIA_TRANSCODING_TABLE_HH |
| #define _MEDIA_TRANSCODING_TABLE_HH |
| |
| #ifndef _FRAMED_FILTER_HH |
| #include "FramedFilter.hh" |
| #endif |
| #ifndef _MEDIA_SESSION_HH |
| #include "MediaSession.hh" |
| #endif |
| |
| class MediaTranscodingTable: public Medium { |
| public: |
| virtual FramedFilter* |
| lookupTranscoder(MediaSubsession& /*inputCodecDescription*/, // in |
| char*& outputCodecName/* out; must be delete[]d later */) { |
| // Default implementation: Return NULL (indicating: no transcoding). |
| // You would reimplement this virtual function in a subclass to return a new 'transcoding' |
| // "FramedFilter" (subclass) object for each ("mediumName","codecName") that you wish to |
| // transcode (or return NULL for no transcoding). |
| // (Note that "inputCodecDescription" must have a non-NULL "readSource()"; this is used |
| // as the input to the new "FramedFilter" (subclass) object.) |
| outputCodecName = NULL; |
| return NULL; |
| } |
| |
| virtual Boolean weWillTranscode(char const* /*mediumName*/, char const* /*codecName*/) { |
| // Default implementation: Return False. |
| // You would reimplement this in a subclass - returning True for each |
| // <mediumName>/<codecName> for which you'll do transcoding. |
| // Note: Unlike "lookupTranscoder()", this function does not actually create any 'transcoding' |
| // filter objects. (It may be called before "MediaSubsession::initiate()".) |
| return False; |
| } |
| |
| protected: // we are to be subclassed only |
| MediaTranscodingTable(UsageEnvironment& env) |
| : Medium(env) { |
| } |
| virtual ~MediaTranscodingTable() { |
| } |
| }; |
| |
| #endif |