67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
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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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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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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) 1996-2024 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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#ifndef _MEDIA_TRANSCODING_TABLE_HH
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#define _MEDIA_TRANSCODING_TABLE_HH
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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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class LIVEMEDIA_API 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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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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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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#endif
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