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81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2015 Johannes Pohl
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <iostream>
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#include "pcmChunk.h"
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#include "common/log.h"
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using namespace std;
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namespace msg
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{
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PcmChunk::PcmChunk(const SampleFormat& sampleFormat, size_t ms) : WireChunk(sampleFormat.rate*sampleFormat.frameSize*ms / 1000), format(sampleFormat), idx_(0)
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{
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}
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PcmChunk::PcmChunk(const PcmChunk& pcmChunk) : WireChunk(pcmChunk), format(pcmChunk.format), idx_(0)
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{
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}
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PcmChunk::PcmChunk() : WireChunk(), idx_(0)
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{
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}
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PcmChunk::~PcmChunk()
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{
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}
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int PcmChunk::seek(int frames)
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{
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idx_ += frames;
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if (idx_ > getFrameCount())
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idx_ = getFrameCount();
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if (idx_ < 0)
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idx_ = 0;
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return idx_;
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}
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int PcmChunk::readFrames(void* outputBuffer, size_t frameCount)
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{
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//logd << "read: " << frameCount << ", total: " << (wireChunk->length / format.frameSize) << ", idx: " << idx;// << std::endl;
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int result = frameCount;
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if (idx_ + frameCount > (payloadSize / format.frameSize))
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result = (payloadSize / format.frameSize) - idx_;
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//logd << ", from: " << format.frameSize*idx << ", to: " << format.frameSize*idx + format.frameSize*result;
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if (outputBuffer != NULL)
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memcpy((char*)outputBuffer, (char*)(payload) + format.frameSize*idx_, format.frameSize*result);
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idx_ += result;
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//logd << ", new idx: " << idx << ", result: " << result << ", wireChunk->length: " << wireChunk->length << ", format.frameSize: " << format.frameSize << "\n";//std::endl;
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return result;
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}
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}
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