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| | | /********** |
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| | | This library is free software; you can redistribute it and/or modify it under |
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| | | the terms of the GNU Lesser General Public License as published by the |
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| | | Free Software Foundation; either version 3 of the License, or (at your |
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| | | option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.) |
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| | | |
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| | | This library is distributed in the hope that it will be useful, but WITHOUT |
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| | | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| | | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for |
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| | | more details. |
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| | | |
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| | | You should have received a copy of the GNU Lesser General Public License |
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| | | along with this library; if not, write to the Free Software Foundation, Inc., |
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| | | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| | | **********/ |
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| | | // "liveMedia" |
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| | | // Copyright (c) 1996-2017 Live Networks, Inc. All rights reserved. |
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| | | // A class that implements a database that can be accessed to create |
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| | | // "FramedFilter" (subclass) objects that transcode one codec into another. |
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| | | // The implementation of this class just returns NULL for each codec lookup; |
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| | | // To actually implement transcoding, you would subclass it. |
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| | | // C++ header |
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| | | |
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| | | #ifndef _MEDIA_TRANSCODING_TABLE_HH |
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| | | #define _MEDIA_TRANSCODING_TABLE_HH |
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| | | |
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| | | #ifndef _FRAMED_FILTER_HH |
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| | | #include "FramedFilter.hh" |
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| | | #endif |
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| | | #ifndef _MEDIA_SESSION_HH |
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| | | #include "MediaSession.hh" |
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| | | #endif |
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| | | |
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| | | class MediaTranscodingTable: public Medium { |
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| | | public: |
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| | | virtual FramedFilter* |
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| | | lookupTranscoder(MediaSubsession& /*inputCodecDescription*/, // in |
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| | | char*& outputCodecName/* out; must be delete[]d later */) { |
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| | | // Default implementation: Return NULL (indicating: no transcoding). |
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| | | // You would reimplement this virtual function in a subclass to return a new 'transcoding' |
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| | | // "FramedFilter" (subclass) object for each ("mediumName","codecName") that you wish to |
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| | | // transcode (or return NULL for no transcoding). |
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| | | // (Note that "inputCodecDescription" must have a non-NULL "readSource()"; this is used |
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| | | // as the input to the new "FramedFilter" (subclass) object.) |
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| | | outputCodecName = NULL; |
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| | | return NULL; |
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| | | } |
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| | | |
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| | | virtual Boolean weWillTranscode(char const* /*mediumName*/, char const* /*codecName*/) { |
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| | | // Default implementation: Return False. |
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| | | // You would reimplement this in a subclass - returning True for each |
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| | | // <mediumName>/<codecName> for which you'll do transcoding. |
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| | | // Note: Unlike "lookupTranscoder()", this function does not actually create any 'transcoding' |
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| | | // filter objects. (It may be called before "MediaSubsession::initiate()".) |
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| | | return False; |
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| | | } |
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| | | |
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| | | protected: // we are to be subclassed only |
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| | | MediaTranscodingTable(UsageEnvironment& env) |
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| | | : Medium(env) { |
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| | | } |
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| | | virtual ~MediaTranscodingTable() { |
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| | | } |
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| | | }; |
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| | | |
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| | | #endif |
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