/**********
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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) 1996-2017 Live Networks, Inc. All rights reserved.
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// Filters for converting between raw PCM audio and uLaw
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// C++ header
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#ifndef _ULAW_AUDIO_FILTER_HH
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#define _ULAW_AUDIO_FILTER_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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////////// 16-bit PCM (in various byte orderings) -> 8-bit u-Law //////////
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class uLawFromPCMAudioSource: public FramedFilter {
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public:
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static uLawFromPCMAudioSource*
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createNew(UsageEnvironment& env, FramedSource* inputSource,
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int byteOrdering = 0);
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// "byteOrdering" == 0 => host order (the default)
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// "byteOrdering" == 1 => little-endian order
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// "byteOrdering" == 2 => network (i.e., big-endian) order
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protected:
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uLawFromPCMAudioSource(UsageEnvironment& env, FramedSource* inputSource,
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int byteOrdering);
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// called only by createNew()
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virtual ~uLawFromPCMAudioSource();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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private:
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int fByteOrdering;
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unsigned char* fInputBuffer;
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unsigned fInputBufferSize;
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};
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////////// u-Law -> 16-bit PCM (in host order) //////////
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class PCMFromuLawAudioSource: public FramedFilter {
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public:
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static PCMFromuLawAudioSource*
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createNew(UsageEnvironment& env, FramedSource* inputSource);
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protected:
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PCMFromuLawAudioSource(UsageEnvironment& env,
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FramedSource* inputSource);
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// called only by createNew()
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virtual ~PCMFromuLawAudioSource();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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private:
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unsigned char* fInputBuffer;
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unsigned fInputBufferSize;
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};
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////////// 16-bit values (in host order) -> 16-bit network order //////////
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class NetworkFromHostOrder16: public FramedFilter {
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public:
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static NetworkFromHostOrder16*
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createNew(UsageEnvironment& env, FramedSource* inputSource);
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protected:
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NetworkFromHostOrder16(UsageEnvironment& env, FramedSource* inputSource);
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// called only by createNew()
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virtual ~NetworkFromHostOrder16();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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};
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////////// 16-bit values (in network order) -> 16-bit host order //////////
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class HostFromNetworkOrder16: public FramedFilter {
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public:
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static HostFromNetworkOrder16*
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createNew(UsageEnvironment& env, FramedSource* inputSource);
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protected:
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HostFromNetworkOrder16(UsageEnvironment& env, FramedSource* inputSource);
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// called only by createNew()
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virtual ~HostFromNetworkOrder16();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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};
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////////// 16-bit values: little-endian <-> big-endian //////////
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class EndianSwap16: public FramedFilter {
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public:
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static EndianSwap16* createNew(UsageEnvironment& env, FramedSource* inputSource);
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protected:
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EndianSwap16(UsageEnvironment& env, FramedSource* inputSource);
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// called only by createNew()
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virtual ~EndianSwap16();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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};
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////////// 24-bit values: little-endian <-> big-endian //////////
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class EndianSwap24: public FramedFilter {
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public:
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static EndianSwap24* createNew(UsageEnvironment& env, FramedSource* inputSource);
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protected:
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EndianSwap24(UsageEnvironment& env, FramedSource* inputSource);
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// called only by createNew()
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virtual ~EndianSwap24();
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private:
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// Redefined virtual functions:
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virtual void doGetNextFrame();
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private:
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static void afterGettingFrame(void* clientData, unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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void afterGettingFrame1(unsigned frameSize,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds);
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};
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#endif
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