93 lines
3.3 KiB
C++
Executable File
93 lines
3.3 KiB
C++
Executable File
/**********
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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 2.1 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) 1996-2016 Live Networks, Inc. All rights reserved.
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// Transcoder for ADUized MP3 frames
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// Implementation
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#include "MP3ADUTranscoder.hh"
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#include "MP3Internals.hh"
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#include <string.h>
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MP3ADUTranscoder::MP3ADUTranscoder(UsageEnvironment& env,
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unsigned outBitrate /* in kbps */,
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FramedSource* inputSource)
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: FramedFilter(env, inputSource),
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fOutBitrate(outBitrate),
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fAvailableBytesForBackpointer(0),
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fOrigADU(new unsigned char[MAX_MP3_FRAME_SIZE]) {
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}
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MP3ADUTranscoder::~MP3ADUTranscoder() {
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delete[] fOrigADU;
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}
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MP3ADUTranscoder* MP3ADUTranscoder::createNew(UsageEnvironment& env,
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unsigned outBitrate /* in kbps */,
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FramedSource* inputSource) {
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// The source must be an MP3 ADU source:
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if (strcmp(inputSource->MIMEtype(), "audio/MPA-ROBUST") != 0) {
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env.setResultMsg(inputSource->name(), " is not an MP3 ADU source");
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return NULL;
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}
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return new MP3ADUTranscoder(env, outBitrate, inputSource);
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}
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void MP3ADUTranscoder::getAttributes() const {
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// Begin by getting the attributes from our input source:
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fInputSource->getAttributes();
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// Then modify them by appending the corrected bandwidth
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char buffer[30];
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sprintf(buffer, " bandwidth %d", outBitrate());
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envir().appendToResultMsg(buffer);
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}
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void MP3ADUTranscoder::doGetNextFrame() {
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fInputSource->getNextFrame(fOrigADU, MAX_MP3_FRAME_SIZE,
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afterGettingFrame, this, handleClosure, this);
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}
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void MP3ADUTranscoder::afterGettingFrame(void* clientData,
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unsigned numBytesRead,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds) {
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MP3ADUTranscoder* transcoder = (MP3ADUTranscoder*)clientData;
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transcoder->afterGettingFrame1(numBytesRead, numTruncatedBytes,
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presentationTime, durationInMicroseconds);
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}
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void MP3ADUTranscoder::afterGettingFrame1(unsigned numBytesRead,
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unsigned numTruncatedBytes,
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struct timeval presentationTime,
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unsigned durationInMicroseconds) {
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fNumTruncatedBytes = numTruncatedBytes; // but can we handle this being >0? #####
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fPresentationTime = presentationTime;
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fDurationInMicroseconds = durationInMicroseconds;
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fFrameSize = TranscodeMP3ADU(fOrigADU, numBytesRead, fOutBitrate,
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fTo, fMaxSize, fAvailableBytesForBackpointer);
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if (fFrameSize == 0) { // internal error - bad ADU data?
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handleClosure();
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return;
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}
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// Call our own 'after getting' function. Because we're not a 'leaf'
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// source, we can call this directly, without risking infinite recursion.
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afterGetting(this);
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}
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