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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "foxenflac.hpp"
#include <stdint.h>
#include <sys/_stdint.h>
#include <cstdlib>
#include "esp_log.h"
#include "foxen/flac.h"
#include "sample.hpp"
namespace codecs {
[[maybe_unused]] static const char kTag[] = "flac";
FoxenFlacDecoder::FoxenFlacDecoder()
: input_(), buffer_(), flac_(FX_FLAC_ALLOC(FLAC_MAX_BLOCK_SIZE, 2)) {}
FoxenFlacDecoder::~FoxenFlacDecoder() {
free(flac_);
}
auto FoxenFlacDecoder::OpenStream(std::shared_ptr<IStream> input)
-> cpp::result<OutputFormat, Error> {
input_ = input;
bool eof = false;
fx_flac_state_t state;
do {
eof = buffer_.Refill(input_.get());
buffer_.ConsumeBytes([&](cpp::span<std::byte> buf) -> size_t {
uint32_t bytes_used = buf.size();
state =
fx_flac_process(flac_, reinterpret_cast<const uint8_t*>(buf.data()),
&bytes_used, NULL, NULL);
return bytes_used;
});
} while (state != FLAC_END_OF_METADATA && !eof);
if (state != FLAC_END_OF_METADATA) {
if (state == FLAC_ERR) {
return cpp::fail(Error::kMalformedData);
} else {
return cpp::fail(Error::kOutOfInput);
}
}
int64_t channels = fx_flac_get_streaminfo(flac_, FLAC_KEY_N_CHANNELS);
int64_t fs = fx_flac_get_streaminfo(flac_, FLAC_KEY_SAMPLE_RATE);
if (channels == FLAC_INVALID_METADATA_KEY ||
fs == FLAC_INVALID_METADATA_KEY) {
return cpp::fail(Error::kMalformedData);
}
OutputFormat format{
.num_channels = static_cast<uint8_t>(channels),
.sample_rate_hz = static_cast<uint32_t>(fs),
};
uint64_t num_samples = fx_flac_get_streaminfo(flac_, FLAC_KEY_N_SAMPLES);
if (num_samples > 0) {
format.total_samples = num_samples * channels;
}
return format;
}
auto FoxenFlacDecoder::DecodeTo(cpp::span<sample::Sample> output)
-> cpp::result<OutputInfo, Error> {
bool is_eof = buffer_.Refill(input_.get());
cpp::span<int32_t> output32{reinterpret_cast<int32_t*>(output.data()),
output.size() / 2};
uint32_t samples_written = output32.size();
fx_flac_state_t state;
buffer_.ConsumeBytes([&](cpp::span<std::byte> buf) -> size_t {
uint32_t bytes_read = buf.size_bytes();
state = fx_flac_process(flac_, reinterpret_cast<const uint8_t*>(buf.data()),
&bytes_read, output32.data(), &samples_written);
return bytes_read;
});
if (state == FLAC_ERR) {
return cpp::fail(Error::kMalformedData);
}
for (size_t i = 0; i < samples_written; i++) {
output[i] = output32[i] >> 16;
}
return OutputInfo{.samples_written = samples_written,
.is_stream_finished = samples_written == 0 && is_eof};
}
auto FoxenFlacDecoder::SeekTo(size_t target) -> cpp::result<void, Error> {
return {};
}
} // namespace codecs
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