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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 {
static const char kTag[] = "flac";
FoxenFlacDecoder::FoxenFlacDecoder()
: flac_(FX_FLAC_ALLOC(FLAC_MAX_BLOCK_SIZE, 2)) {}
FoxenFlacDecoder::~FoxenFlacDecoder() {
free(flac_);
}
auto FoxenFlacDecoder::BeginStream(const cpp::span<const std::byte> input)
-> Result<OutputFormat> {
uint32_t bytes_used = input.size_bytes();
fx_flac_state_t state =
fx_flac_process(flac_, reinterpret_cast<const uint8_t*>(input.data()),
&bytes_used, NULL, NULL);
if (state != FLAC_END_OF_METADATA) {
if (state == FLAC_ERR) {
return {bytes_used, cpp::fail(Error::kMalformedData)};
} else {
return {bytes_used, 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 {bytes_used, cpp::fail(Error::kMalformedData)};
}
OutputFormat format{
.num_channels = static_cast<uint8_t>(channels),
.sample_rate_hz = static_cast<uint32_t>(fs),
.duration_seconds = {},
.bits_per_second = {},
};
uint64_t num_samples = fx_flac_get_streaminfo(flac_, FLAC_KEY_N_SAMPLES);
if (num_samples > 0) {
format.duration_seconds = num_samples / fs;
}
return {bytes_used, format};
}
auto FoxenFlacDecoder::ContinueStream(cpp::span<const std::byte> input,
cpp::span<sample::Sample> output)
-> Result<OutputInfo> {
cpp::span<int32_t> output_as_samples{
reinterpret_cast<int32_t*>(output.data()), output.size_bytes() / 4};
uint32_t bytes_read = input.size_bytes();
uint32_t samples_written = output_as_samples.size();
fx_flac_state_t state =
fx_flac_process(flac_, reinterpret_cast<const uint8_t*>(input.data()),
&bytes_read, output_as_samples.data(), &samples_written);
if (state == FLAC_ERR) {
return {bytes_read, cpp::fail(Error::kMalformedData)};
}
if (samples_written > 0) {
return {bytes_read,
OutputInfo{.samples_written = samples_written,
.is_finished_writing = state == FLAC_END_OF_FRAME}};
}
// No error, but no samples written. We must be out of data.
return {bytes_read, cpp::fail(Error::kOutOfInput)};
}
auto FoxenFlacDecoder::SeekStream(cpp::span<const std::byte> input,
std::size_t target_sample) -> Result<void> {
// TODO(jacqueline): Implement me.
return {0, {}};
}
} // namespace codecs
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