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#include "LibsndfileTagger.h"
#include "AcidizerTags.h"
#include <array>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <memory>
#include <stdexcept>
namespace LibImportExport
{
namespace Test
{
LibsndfileTagger::LibsndfileTagger(double duration, const std::string& filename)
: mFilename { filename.empty() ? std::tmpnam(nullptr) : filename }
{
SF_INFO sfInfo;
std::memset(&sfInfo, 0, sizeof(sfInfo));
sfInfo.samplerate = 44100;
sfInfo.channels = 1;
sfInfo.format = SF_FORMAT_WAV | SF_FORMAT_PCM_16;
sfInfo.sections = 1;
sfInfo.seekable = 1;
mFile = sf_open(mFilename.c_str(), SFM_WRITE, &sfInfo);
assert(mFile != nullptr);
if (duration > 0)
{
// Write zeros using sf_write_float
sfInfo.frames =
static_cast<sf_count_t>(std::round(duration * sfInfo.samplerate));
const auto numItems = sfInfo.channels * sfInfo.frames;
std::unique_ptr<short[]> zeros { new short[numItems] };
std::fill(zeros.get(), zeros.get() + numItems, 0);
const auto written = sf_write_short(mFile, zeros.get(), numItems);
if (written != numItems)
throw std::runtime_error("Failed to write audio to file");
}
}
LibsndfileTagger::~LibsndfileTagger()
{
sf_close(mFile);
}
LibsndfileTagger::operator bool() const
{
return mFile != nullptr;
}
SNDFILE& LibsndfileTagger::ReopenInReadMode()
{
if (!mFile)
throw std::runtime_error("File is not open");
sf_close(mFile);
mDistributorData.reset();
mAcidData.reset();
SF_INFO sfInfo;
mFile = sf_open(mFilename.c_str(), SFM_READ, &sfInfo);
if (!mFile)
throw std::runtime_error("Failed to re-open file");
return *mFile;
}
void LibsndfileTagger::AddAcidizerTags(const Test::AcidizerTags& acidTags)
{
// Adapted from the ACID chunk readout code in libsndfile and its comment:
// clang-format off
/*
** The acid chunk goes a little something like this:
**
** 4 bytes 'acid'
** 4 bytes (int) length of chunk starting at next byte
**
** 4 bytes (int) type of file:
** this appears to be a bit mask,however some combinations
** are probably impossible and/or qualified as "errors"
**
** 0x01 On: One Shot Off: Loop
** 0x02 On: Root note is Set Off: No root
** 0x04 On: Stretch is On, Off: Strech is OFF
** 0x08 On: Disk Based Off: Ram based
** 0x10 On: ?????????? Off: ????????? (Acidizer puts that ON)
**
** 2 bytes (short) root note
** if type 0x10 is OFF : [C,C#,(...),B] -> [0x30 to 0x3B]
** if type 0x10 is ON : [C,C#,(...),B] -> [0x3C to 0x47]
** (both types fit on same MIDI pitch albeit different octaves, so who cares)
**
** 2 bytes (short) ??? always set to 0x8000
** 4 bytes (float) ??? seems to be always 0
** 4 bytes (int) number of beats
** 2 bytes (short) meter denominator //always 4 in SF/ACID
** 2 bytes (short) meter numerator //always 4 in SF/ACID
** //are we sure about the order?? usually its num/denom
** 4 bytes (float) tempo
**
*/
// clang-format on
SF_LOOP_INFO loopInfo {};
loopInfo.bpm = acidTags.bpm.value_or(0.);
loopInfo.loop_mode = acidTags.isOneShot ? SF_LOOP_NONE : SF_LOOP_FORWARD;
SF_CHUNK_INFO chunk;
std::memset(&chunk, 0, sizeof(chunk));
std::snprintf(chunk.id, sizeof(chunk.id), "acid");
chunk.id_size = 4;
// All sizes listed above except the first two:
chunk.datalen = 4 + 2 + 2 + 4 + 4 + 2 + 2 + 4;
mAcidData = std::make_unique<uint8_t[]>(chunk.datalen);
std::memset(mAcidData.get(), 0, chunk.datalen);
chunk.data = mAcidData.get();
// The type has 4 bytes, of which we may only set the 1st bit to 1 if the
// loop is one-shot:
if (acidTags.isOneShot)
{
auto type = reinterpret_cast<uint32_t*>(mAcidData.get());
*type |= 0x00000001;
}
else if (acidTags.beats.has_value())
{
auto numBeats = reinterpret_cast<uint32_t*>(mAcidData.get() + 12);
*numBeats = *acidTags.beats;
}
else
{
assert(acidTags.bpm.has_value());
auto tempo = reinterpret_cast<float*>(mAcidData.get() + 20);
*tempo = *acidTags.bpm;
}
// Set the meter denominator 2 bytes to 4:
auto numerator = reinterpret_cast<uint16_t*>(mAcidData.get() + 16);
*numerator |= 0x0004;
auto denominator = reinterpret_cast<uint16_t*>(mAcidData.get() + 18);
*denominator |= 0x0004;
const auto result = sf_set_chunk(mFile, &chunk);
assert(result == SF_ERR_NO_ERROR);
}
void LibsndfileTagger::AddDistributorInfo(const std::string& distributor)
{
const uint32_t distributorSize = distributor.size();
// Why we didn't use `auto` the line above:
static_assert(sizeof(distributorSize) == 4);
SF_CHUNK_INFO chunk;
std::snprintf(chunk.id, sizeof(chunk.id), "LIST");
chunk.id_size = 4;
constexpr std::array<char, 4> listTypeID = { 'I', 'N', 'F', 'O' };
constexpr std::array<char, 4> distributorTypeID = { 'I', 'D', 'S', 'T' };
chunk.datalen = sizeof(listTypeID) + sizeof(distributorTypeID) +
sizeof(distributorSize) + distributorSize;
// A trick taken from libsndfile's source code, probably to ensure that
// the rest of the data stays word-aligned:
while (chunk.datalen & 3)
++chunk.datalen;
mDistributorData = std::make_unique<uint8_t[]>(chunk.datalen);
chunk.data = mDistributorData.get();
auto data = mDistributorData.get();
std::memset(chunk.data, 0, chunk.datalen);
auto pos = 0;
std::memcpy(data + pos, listTypeID.data(), sizeof(listTypeID));
pos += sizeof(listTypeID);
std::memcpy(data + pos, distributorTypeID.data(), sizeof(distributorTypeID));
pos += sizeof(distributorTypeID);
std::memcpy(data + pos, &distributorSize, sizeof(distributorSize));
pos += sizeof(distributorSize);
std::memcpy(data + pos, distributor.data(), distributorSize);
const auto result = sf_set_chunk(mFile, &chunk);
assert(result == SF_ERR_NO_ERROR);
}
} // namespace Test
} // namespace LibImportExport
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