mirror of https://github.com/jorio/Pomme.git
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
#ifndef POMME_NO_MP3
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#include "PommeSound.h"
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#include <vector>
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#include <algorithm>
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#define MINIMP3_IMPLEMENTATION
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#include "SoundFormats/minimp3.h"
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#define MINIMP3_IO_SIZE (128*1024) // io buffer size for streaming functions, must be greater than MINIMP3_BUF_SIZE
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#define MINIMP3_BUF_SIZE (16*1024) // buffer which can hold minimum 10 consecutive mp3 frames (~16KB) worst case
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SndListHandle Pomme::Sound::LoadMP3AsResource(std::istream& stream)
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{
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mp3dec_t context = {};
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mp3dec_init(&context);
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mp3dec_frame_info_t frameInfo;
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std::vector<uint8_t> fileBuf;
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std::vector<mp3d_sample_t> songPCM;
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std::vector<mp3d_sample_t> tempPCM(MINIMP3_MAX_SAMPLES_PER_FRAME);
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int totalSamples = 0;
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while (true)
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{
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// Refill buffer
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if (fileBuf.size() < MINIMP3_BUF_SIZE)
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{
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if (stream.eof())
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{
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// bail
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break;
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}
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auto oldSize = fileBuf.size();
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auto toRead = MINIMP3_BUF_SIZE - oldSize;
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fileBuf.resize(MINIMP3_BUF_SIZE);
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stream.read((char*) (fileBuf.data() + oldSize), (int) toRead);
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auto didRead = stream.gcount();
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fileBuf.resize(oldSize + didRead);
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}
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int numDecodedSamples = mp3dec_decode_frame(&context, fileBuf.data(), (int) fileBuf.size(), tempPCM.data(), &frameInfo);
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if (numDecodedSamples > 0)
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{
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size_t minCapacity = songPCM.size() + (numDecodedSamples * frameInfo.channels);
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if (songPCM.capacity() < minCapacity)
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{
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songPCM.reserve(2 * minCapacity);
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}
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songPCM.insert(songPCM.end(), tempPCM.begin(), tempPCM.begin() + (numDecodedSamples * frameInfo.channels));
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totalSamples += numDecodedSamples;
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}
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fileBuf.erase(fileBuf.begin(), fileBuf.begin() + frameInfo.frame_bytes);
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}
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Pomme::Sound::SampledSoundInfo info = {};
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info.compressionType = 'swot';
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info.bigEndian = false;
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info.isCompressed = false;
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info.baseNote = 60; // Middle C
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info.codecBitDepth = 8 * sizeof(mp3d_sample_t);
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info.sampleRate = frameInfo.hz;
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info.nChannels = frameInfo.channels;
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info.nPackets = totalSamples;
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info.decompressedLength = totalSamples * info.nChannels * sizeof(mp3d_sample_t);
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info.compressedLength = info.decompressedLength;
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info.dataStart = (char*) songPCM.data();
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return info.MakeStandaloneResource();
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}
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#endif // POMME_NO_MP3
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