mirror of
https://github.com/badaix/snapcast.git
synced 2025-04-29 18:27:12 +02:00
221 lines
8.2 KiB
C++
221 lines
8.2 KiB
C++
/***
|
|
This file is part of snapcast
|
|
Copyright (C) 2014-2020 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/>.
|
|
***/
|
|
|
|
#include "flac_decoder.hpp"
|
|
#include "common/aixlog.hpp"
|
|
#include "common/endian.hpp"
|
|
#include "common/snap_exception.hpp"
|
|
#include <cmath>
|
|
#include <cstring>
|
|
#include <iostream>
|
|
|
|
|
|
using namespace std;
|
|
|
|
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 = (char*)realloc(flacChunk->payload, chunk->payloadSize);
|
|
memcpy(flacChunk->payload, chunk->payload, chunk->payloadSize);
|
|
flacChunk->payloadSize = chunk->payloadSize;
|
|
|
|
pcmChunk->payload = (char*)realloc(pcmChunk->payload, 0);
|
|
pcmChunk->payloadSize = 0;
|
|
while (flacChunk->payloadSize > 0)
|
|
{
|
|
if (!FLAC__stream_decoder_process_single(decoder))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (lastError_)
|
|
{
|
|
LOG(ERROR) << "FLAC decode error: " << FLAC__StreamDecoderErrorStatusString[*lastError_] << "\n";
|
|
lastError_ = nullptr;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if ((cacheInfo_.cachedBlocks_ > 0) && (cacheInfo_.sampleRate_ != 0))
|
|
{
|
|
double diffMs = cacheInfo_.cachedBlocks_ / ((double)cacheInfo_.sampleRate_ / 1000.);
|
|
int32_t s = (diffMs / 1000);
|
|
int32_t us = (diffMs * 1000);
|
|
us %= 1000000;
|
|
LOG(DEBUG) << "Cached: " << cacheInfo_.cachedBlocks_ << ", " << diffMs << "ms, " << s << "s, " << us << "us\n";
|
|
chunk->timestamp = chunk->timestamp - tv(s, us);
|
|
}
|
|
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]));
|
|
|
|
sampleFormat.rate = 0;
|
|
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 - *bytes;
|
|
flacChunk->payload = (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;
|
|
|
|
FlacDecoder* flacDecoder = static_cast<FlacDecoder*>(client_data);
|
|
if (flacDecoder->cacheInfo_.isCachedChunk_)
|
|
flacDecoder->cacheInfo_.cachedBlocks_ += frame->header.blocksize;
|
|
|
|
pcmChunk->payload = (char*)realloc(pcmChunk->payload, pcmChunk->payloadSize + bytes);
|
|
|
|
for (size_t channel = 0; channel < sampleFormat.channels; ++channel)
|
|
{
|
|
if (buffer[channel] == nullptr)
|
|
{
|
|
SLOG(ERROR) << "ERROR: buffer[" << channel << "] is NULL\n";
|
|
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
|
|
}
|
|
|
|
if (sampleFormat.sampleSize == 1)
|
|
{
|
|
int8_t* chunkBuffer = (int8_t*)(pcmChunk->payload + pcmChunk->payloadSize);
|
|
for (size_t i = 0; i < frame->header.blocksize; i++)
|
|
chunkBuffer[sampleFormat.channels * i + channel] = (int8_t)(buffer[channel][i]);
|
|
}
|
|
else if (sampleFormat.sampleSize == 2)
|
|
{
|
|
int16_t* chunkBuffer = (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)
|
|
{
|
|
int32_t* chunkBuffer = (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 += 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, metadata->data.stream_info.bits_per_sample, metadata->data.stream_info.channels);
|
|
}
|
|
}
|
|
|
|
|
|
void error_callback(const FLAC__StreamDecoder* /*decoder*/, FLAC__StreamDecoderErrorStatus status, void* client_data)
|
|
{
|
|
SLOG(ERROR) << "Got error callback: " << FLAC__StreamDecoderErrorStatusString[status] << "\n";
|
|
static_cast<FlacDecoder*>(client_data)->lastError_ = std::unique_ptr<FLAC__StreamDecoderErrorStatus>(new FLAC__StreamDecoderErrorStatus(status));
|
|
}
|
|
} // namespace callback
|
|
|
|
} // namespace decoder
|