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/***
This file is part of snapcast
Copyright (C) 2014-2024 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
// prototype/interface header file
#include "flac_decoder.hpp"
// local headers
#include "common/aixlog.hpp"
#include "common/endian.hpp"
#include "common/snap_exception.hpp"
// standard headers
#include <cstring>
#include <iostream>
using namespace std;
static constexpr auto LOG_TAG = "FlacDecoder";
namespace decoder
{
namespace callback
{
FLAC__StreamDecoderReadStatus read_callback(const FLAC__StreamDecoder* decoder, FLAC__byte buffer[], size_t* bytes, void* client_data);
FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder* decoder, const FLAC__Frame* frame, const FLAC__int32* const buffer[],
void* client_data);
void metadata_callback(const FLAC__StreamDecoder* decoder, const FLAC__StreamMetadata* metadata, void* client_data);
void error_callback(const FLAC__StreamDecoder* decoder, FLAC__StreamDecoderErrorStatus status, void* client_data);
} // namespace callback
namespace
{
msg::CodecHeader* flacHeader = nullptr;
msg::PcmChunk* flacChunk = nullptr;
msg::PcmChunk* pcmChunk = nullptr;
SampleFormat sampleFormat;
FLAC__StreamDecoder* decoder = nullptr;
} // namespace
FlacDecoder::FlacDecoder() : Decoder(), lastError_(nullptr)
{
flacChunk = new msg::PcmChunk();
}
FlacDecoder::~FlacDecoder()
{
std::lock_guard<std::mutex> lock(mutex_);
FLAC__stream_decoder_delete(decoder);
delete flacChunk;
}
bool FlacDecoder::decode(msg::PcmChunk* chunk)
{
std::lock_guard<std::mutex> lock(mutex_);
cacheInfo_.reset();
pcmChunk = chunk;
flacChunk->payload = static_cast<char*>(realloc(flacChunk->payload, chunk->payloadSize));
memcpy(flacChunk->payload, chunk->payload, chunk->payloadSize);
flacChunk->payloadSize = chunk->payloadSize;
pcmChunk->payload = static_cast<char*>(realloc(pcmChunk->payload, 0));
pcmChunk->payloadSize = 0;
while (flacChunk->payloadSize > 0)
{
if (FLAC__stream_decoder_process_single(decoder) == 0)
{
return false;
}
if (lastError_)
{
LOG(ERROR, LOG_TAG) << "FLAC decode error: " << FLAC__StreamDecoderErrorStatusString[*lastError_] << "\n";
lastError_ = nullptr;
return false;
}
}
if ((cacheInfo_.cachedBlocks_ > 0) && (cacheInfo_.sampleRate_ != 0))
{
double diffMs = static_cast<double>(cacheInfo_.cachedBlocks_) / (static_cast<double>(cacheInfo_.sampleRate_) / 1000.);
auto us = static_cast<uint64_t>(diffMs * 1000.);
tv diff(static_cast<int32_t>(us / 1000000), static_cast<int32_t>(us % 1000000));
LOG(TRACE, LOG_TAG) << "Cached: " << cacheInfo_.cachedBlocks_ << ", " << diffMs << "ms, " << diff.sec << "s, " << diff.usec << "us\n";
chunk->timestamp = chunk->timestamp - diff;
}
return true;
}
SampleFormat FlacDecoder::setHeader(msg::CodecHeader* chunk)
{
flacHeader = chunk;
FLAC__StreamDecoderInitStatus init_status;
if ((decoder = FLAC__stream_decoder_new()) == nullptr)
throw SnapException("ERROR: allocating decoder");
// (void)FLAC__stream_decoder_set_md5_checking(decoder, true);
init_status = FLAC__stream_decoder_init_stream(decoder, callback::read_callback, nullptr, nullptr, nullptr, nullptr, callback::write_callback,
callback::metadata_callback, callback::error_callback, this);
if (init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK)
throw SnapException("ERROR: initializing decoder: " + string(FLAC__StreamDecoderInitStatusString[init_status]));
FLAC__stream_decoder_process_until_end_of_metadata(decoder);
if (sampleFormat.rate() == 0)
throw SnapException("Sample format not found");
return sampleFormat;
}
namespace callback
{
FLAC__StreamDecoderReadStatus read_callback(const FLAC__StreamDecoder* /*decoder*/, FLAC__byte buffer[], size_t* bytes, void* client_data)
{
if (flacHeader != nullptr)
{
*bytes = flacHeader->payloadSize;
memcpy(buffer, flacHeader->payload, *bytes);
flacHeader = nullptr;
}
else if (flacChunk != nullptr)
{
// cerr << "read_callback: " << *bytes << ", avail: " << flacChunk->payloadSize << "\n";
static_cast<FlacDecoder*>(client_data)->cacheInfo_.isCachedChunk_ = false;
if (*bytes > flacChunk->payloadSize)
*bytes = flacChunk->payloadSize;
// if (*bytes == 0)
// return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
memcpy(buffer, flacChunk->payload, *bytes);
memmove(flacChunk->payload, flacChunk->payload + *bytes, flacChunk->payloadSize - *bytes);
flacChunk->payloadSize = flacChunk->payloadSize - static_cast<uint32_t>(*bytes);
flacChunk->payload = static_cast<char*>(realloc(flacChunk->payload, flacChunk->payloadSize));
}
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder* /*decoder*/, const FLAC__Frame* frame, const FLAC__int32* const buffer[],
void* client_data)
{
if (pcmChunk != nullptr)
{
size_t bytes = frame->header.blocksize * sampleFormat.frameSize();
auto* flacDecoder = static_cast<FlacDecoder*>(client_data);
if (flacDecoder->cacheInfo_.isCachedChunk_)
flacDecoder->cacheInfo_.cachedBlocks_ += frame->header.blocksize;
pcmChunk->payload = static_cast<char*>(realloc(pcmChunk->payload, pcmChunk->payloadSize + bytes));
for (size_t channel = 0; channel < sampleFormat.channels(); ++channel)
{
if (buffer[channel] == nullptr)
{
LOG(ERROR, LOG_TAG) << "ERROR: buffer[" << channel << "] is NULL\n";
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (sampleFormat.sampleSize() == 1)
{
auto* chunkBuffer = reinterpret_cast<int8_t*>(pcmChunk->payload + pcmChunk->payloadSize);
for (size_t i = 0; i < frame->header.blocksize; i++)
chunkBuffer[sampleFormat.channels() * i + channel] = static_cast<int8_t>(buffer[channel][i]);
}
else if (sampleFormat.sampleSize() == 2)
{
auto* chunkBuffer = reinterpret_cast<int16_t*>(pcmChunk->payload + pcmChunk->payloadSize);
for (size_t i = 0; i < frame->header.blocksize; i++)
chunkBuffer[sampleFormat.channels() * i + channel] = SWAP_16((int16_t)(buffer[channel][i]));
}
else if (sampleFormat.sampleSize() == 4)
{
auto* chunkBuffer = reinterpret_cast<int32_t*>(pcmChunk->payload + pcmChunk->payloadSize);
for (size_t i = 0; i < frame->header.blocksize; i++)
chunkBuffer[sampleFormat.channels() * i + channel] = SWAP_32((int32_t)(buffer[channel][i]));
}
}
pcmChunk->payloadSize += static_cast<uint32_t>(bytes);
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
void metadata_callback(const FLAC__StreamDecoder* /*decoder*/, const FLAC__StreamMetadata* metadata, void* client_data)
{
/* print some stats */
if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
{
static_cast<FlacDecoder*>(client_data)->cacheInfo_.sampleRate_ = metadata->data.stream_info.sample_rate;
sampleFormat.setFormat(metadata->data.stream_info.sample_rate, static_cast<uint16_t>(metadata->data.stream_info.bits_per_sample),
static_cast<uint16_t>(metadata->data.stream_info.channels));
}
}
void error_callback(const FLAC__StreamDecoder* /*decoder*/, FLAC__StreamDecoderErrorStatus status, void* client_data)
{
LOG(ERROR, LOG_TAG) << "Got error callback: " << FLAC__StreamDecoderErrorStatusString[status] << "\n";
static_cast<FlacDecoder*>(client_data)->lastError_ = std::make_unique<FLAC__StreamDecoderErrorStatus>(status);
}
} // namespace callback
} // namespace decoder
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