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/*
* Copyright 2025 ayumi <ayumi@noreply.codeberg.org>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "wavpack.hpp"
#include <cstdint>
#include <cstring>
#include <algorithm>
#include <optional>
#include "esp_heap_caps.h"
#include "codec.hpp"
#include "esp_log.h"
#include "result.hpp"
#include "sample.hpp"
#include "types.hpp"
namespace codecs {
[[maybe_unused]] static constexpr const char kTag[] = "wavpack";
// kBufSize and audio::kCodecBufferLength must be equal
static constexpr const size_t kBufSize = 2048;
static inline constexpr auto loadLe16(std::byte* data) -> uint16_t {
return *reinterpret_cast<uint16_t*>(data);
}
static inline constexpr auto loadLe32(std::byte* data) -> uint32_t {
return *reinterpret_cast<uint32_t*>(data);
}
static auto readProc(void* data, void* buf, long size) -> long {
IStream* stream = static_cast<IStream*>(data);
const int32_t res = stream->Read({
static_cast<std::byte*>(buf),
static_cast<std::span<std::byte>::size_type>(size)
});
return res < 0 ? 0 : res;
}
WavPackDecoder::WavPackDecoder() : input_(), buf_() {
buf_ = static_cast<int32_t*>(
heap_caps_malloc(
kBufSize * sizeof(int32_t),
MALLOC_CAP_INTERNAL | MALLOC_CAP_32BIT
));
}
WavPackDecoder::~WavPackDecoder() {
heap_caps_free(buf_);
}
auto WavPackDecoder::OpenStream(std::shared_ptr<IStream> input, uint32_t offset)
-> cpp::result<OutputFormat, ICodec::Error> {
char error[80];
input_ = input;
wavpack_ = {};
if (!WavpackOpenFileInput(&wavpack_, readProc, input_.get(), error)) {
ESP_LOGE(kTag, "WavpackOpenFileInput: %s", error);
return cpp::fail(Error::kMalformedData);
}
channels_ = WavpackGetReducedChannels(&wavpack_);
bitdepth_ = WavpackGetBitsPerSample(&wavpack_);
size_ = kBufSize / channels_;
const auto size = input->Size();
const std::optional total = WavpackGetNumSamples(&wavpack_) == -1
? std::nullopt
: std::optional(
static_cast<uint64_t>(WavpackGetNumSamples(&wavpack_)) * channels_
);
const auto rate = WavpackGetSampleRate(&wavpack_);
if (offset && total && input_.get()->CanSeek()) {
const uint32_t want = offset * rate;
if (total < want) {
ESP_LOGE(kTag, "seeking: offset points beyond the end of the file");
return cpp::fail(Error::kInternalError);
}
uint32_t target;
input_->SeekTo(0, IStream::SeekFrom::kStartOfStream);
while (true) {
std::byte header[32];
input_->Read(header);
if (memcmp(header, "wvpk", 4) != 0) {
ESP_LOGE(kTag, "seeking: header expected, but not found");
return cpp::fail(Error::kMalformedData);
}
const uint32_t size = loadLe32(header + 4);
const uint16_t version = loadLe16(header + 8);
if (version < 0x402 || version > 0x410) {
ESP_LOGE(kTag, "seeking: bad WavPack version (%x)", version);
return cpp::fail(Error::kMalformedData);
}
const uint32_t blockIndex = loadLe32(header + 16);
const uint32_t blockSamples = loadLe32(header + 20);
if (want >= blockIndex && want == blockIndex + blockSamples) {
input_->SeekTo(size - 24, IStream::SeekFrom::kCurrentPosition);
target = 0;
break;
} else if (want >= blockIndex && want < blockIndex + blockSamples) {
input_->SeekTo(-32, IStream::SeekFrom::kCurrentPosition);
target = want - blockIndex;
break;
}
input_->SeekTo(size - 24, IStream::SeekFrom::kCurrentPosition);
}
wavpack_ = {};
if (!WavpackOpenFileInput(&wavpack_, readProc, input_.get(), error)) {
ESP_LOGE(kTag, "WavpackOpenFileInput: %s", error);
return cpp::fail(Error::kMalformedData);
}
input_->SetPreambleFinished();
uint32_t samples = 0;
for (size_t i = 0, n = target / size_; i < n; i++)
samples += WavpackUnpackSamples(&wavpack_, buf_, size_);
samples += WavpackUnpackSamples(&wavpack_, buf_, target % size_);
if (WavpackGetNumErrors(&wavpack_) != 0) {
ESP_LOGE(kTag, "CRC error");
return cpp::fail(Error::kMalformedData);
} else if (samples != target || WavpackGetSampleIndex(&wavpack_) != want) {
ESP_LOGE(kTag, "seeking: seeking unsuccessful: want %lu, got %lu",
target, samples
);
return cpp::fail(Error::kInternalError);
}
} else if (offset && (!total || !input_.get()->CanSeek())) {
ESP_LOGE(kTag, "seeking: can’t seek");
return cpp::fail(Error::kInternalError);
} else
input_->SetPreambleFinished();
return OutputFormat{
.num_channels = channels_,
.sample_rate_hz = rate,
.total_samples = total,
.bitrate_kbps = size && total
? std::optional(
((double)size.value() * 8.0)
/ ((double)total.value() / channels_ / rate) / 1000
)
: std::nullopt,
};
}
auto WavPackDecoder::DecodeTo(std::span<sample::Sample> output)
-> cpp::result<OutputInfo, Error> {
const auto size = std::min(size_, output.size() / channels_);
const auto samples = WavpackUnpackSamples(&wavpack_, buf_, size) * channels_;
if (WavpackGetNumErrors(&wavpack_) != 0) {
ESP_LOGE(kTag, "CRC error");
return cpp::fail(Error::kMalformedData);
}
if (bitdepth_ == 16)
for (size_t i = 0; i < samples; i++)
output[i] = buf_[i];
else if (bitdepth_ > 16)
for (size_t i = 0; i < samples; i++)
output[i] = sample::shiftWithDither(buf_[i], bitdepth_ - 16);
else for (size_t i = 0; i < samples; i++)
output[i] = buf_[i] << (16 - bitdepth_);
return OutputInfo{
.samples_written = samples,
.is_stream_finished = samples == 0,
};
}
} // namespace codecs
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