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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2020 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 "pcm_encoder.hpp"
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#include "common/endian.hpp"
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#include <memory>
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namespace encoder
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{
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#define ID_RIFF 0x46464952
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#define ID_WAVE 0x45564157
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#define ID_FMT 0x20746d66
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#define ID_DATA 0x61746164
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namespace
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{
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template <typename T>
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void assign(void* pointer, T val)
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{
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T* p = (T*)pointer;
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*p = val;
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}
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} // namespace
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PcmEncoder::PcmEncoder(const std::string& codecOptions) : Encoder(codecOptions)
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{
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headerChunk_.reset(new msg::CodecHeader("pcm"));
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}
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void PcmEncoder::encode(const msg::PcmChunk& chunk)
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{
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// copy the chunk into a shared_ptr
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auto pcmChunk = std::make_shared<msg::PcmChunk>(chunk);
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encoded_callback_(*this, pcmChunk, pcmChunk->durationMs());
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}
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void PcmEncoder::initEncoder()
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{
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headerChunk_->payloadSize = 44;
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headerChunk_->payload = (char*)realloc(headerChunk_->payload, headerChunk_->payloadSize);
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char* payload = headerChunk_->payload;
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assign(payload, SWAP_32(ID_RIFF));
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assign(payload + 4, SWAP_32(36));
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assign(payload + 8, SWAP_32(ID_WAVE));
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assign(payload + 12, SWAP_32(ID_FMT));
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assign(payload + 16, SWAP_32(16));
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assign(payload + 20, SWAP_16(1));
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assign(payload + 22, SWAP_16(sampleFormat_.channels()));
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assign(payload + 24, SWAP_32(sampleFormat_.rate()));
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assign(payload + 28, SWAP_32(sampleFormat_.rate() * sampleFormat_.bits() * sampleFormat_.channels() / 8));
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assign(payload + 32, SWAP_16(sampleFormat_.channels() * ((sampleFormat_.bits() + 7) / 8)));
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assign(payload + 34, SWAP_16(sampleFormat_.bits()));
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assign(payload + 36, SWAP_32(ID_DATA));
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assign(payload + 40, SWAP_32(0));
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}
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std::string PcmEncoder::name() const
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{
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return "pcm";
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}
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} // namespace encoder
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