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Add optional resampling of the output stream

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badaix 2020-02-14 08:46:13 +01:00
parent 549fcba40f
commit 3fc8b9ca08
8 changed files with 185 additions and 98 deletions
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2
client/Makefile
View file

@ -43,7 +43,7 @@ ifneq ($(SANITIZE), )
endif
CXXFLAGS += $(ADD_CFLAGS) -std=c++14 -Wall -Wextra -Wpedantic -Wno-unused-function -DBOOST_ERROR_CODE_HEADER_ONLY -DHAS_FLAC -DHAS_OGG -DHAS_OPUS -DVERSION=\"$(VERSION)\" -I. -I.. -I../common
LDFLAGS += $(ADD_LDFLAGS) -logg -lFLAC -lopus
LDFLAGS += $(ADD_LDFLAGS) -logg -lFLAC -lopus -lsoxr
OBJ = snapclient.o stream.o client_connection.o time_provider.o player/player.o decoder/pcm_decoder.o decoder/ogg_decoder.o decoder/flac_decoder.o decoder/opus_decoder.o controller.o ../common/sample_format.o

1
client/client_settings.hpp
View file

@ -38,6 +38,7 @@ struct ClientSettings
std::string player_name{""};
int latency{0};
PcmDevice pcm_device;
SampleFormat sample_format;
};
struct LoggingSettings

2
client/controller.cpp
View file

@ -121,7 +121,7 @@ void Controller::onMessageReceived(ClientConnection* /*connection*/, const msg::
sampleFormat_ = decoder_->setHeader(headerChunk_.get());
LOG(NOTICE) << TAG("state") << "sampleformat: " << sampleFormat_.rate << ":" << sampleFormat_.bits << ":" << sampleFormat_.channels << "\n";
stream_ = make_shared<Stream>(sampleFormat_);
stream_ = make_shared<Stream>(sampleFormat_, settings_.player.sample_format);
stream_->setBufferLen(serverSettings_->getBufferMs() - settings_.player.latency);
const auto& pcm_device = settings_.player.pcm_device;

7
client/snapclient.cpp
View file

@ -84,7 +84,6 @@ int main(int argc, char** argv)
ClientSettings settings;
string pcm_device("default");
OptionParser op("Allowed options");
auto helpSwitch = op.add<Switch>("", "help", "produce help message");
auto groffSwitch = op.add<Switch, Attribute::hidden>("", "groff", "produce groff message");
@ -106,6 +105,7 @@ int main(int argc, char** argv)
/*auto instanceValue =*/op.add<Value<size_t>>("i", "instance", "instance id", 1, &settings.instance);
/*auto hostIdValue =*/op.add<Value<string>>("", "hostID", "unique host id", "", &settings.host_id);
op.add<Value<string>>("", "player", "audio backend", "", &settings.player.player_name);
auto sample_format = op.add<Value<string>>("", "sampleformat", "resample audio stream to sampleformat", "");
try
{
@ -210,6 +210,11 @@ int main(int argc, char** argv)
}
#endif
if (sample_format->is_set())
{
settings.player.sample_format = SampleFormat(sample_format->value());
}
bool active = true;
std::shared_ptr<Controller> controller;
auto signal_handler = install_signal_handler({SIGHUP, SIGTERM, SIGINT},

224
client/stream.cpp
View file

@ -28,17 +28,19 @@ using namespace std;
namespace cs = chronos;
Stream::Stream(const SampleFormat& sampleFormat)
: format_(sampleFormat), sleep_(0), median_(0), shortMedian_(0), lastUpdate_(0), playedFrames_(0), bufferMs_(cs::msec(500))
Stream::Stream(const SampleFormat& in_format, const SampleFormat& out_format)
: in_format_(in_format), sleep_(0), median_(0), shortMedian_(0), lastUpdate_(0), playedFrames_(0), bufferMs_(cs::msec(500)), soxr_(nullptr), frame_delta_(0)
{
buffer_.setSize(500);
shortBuffer_.setSize(100);
miniBuffer_.setSize(20);
// cardBuffer_.setSize(50);
// input_rate_ = format_.rate;
// format_.rate = 48000;
// output_rate_ = static_cast<double>(format_.rate);
if (out_format.rate != 0)
format_ = out_format;
else
format_ = in_format_;
/*
48000 x
------- = -----
@ -46,16 +48,37 @@ Stream::Stream(const SampleFormat& sampleFormat)
x = 1,000016667 / (1,000016667 - 1)
*/
setRealSampleRate(format_.rate);
// setRealSampleRate(format_.rate);
// soxr_error_t error;
// soxr_io_spec_t iospec = soxr_io_spec(SOXR_INT16_I, SOXR_INT16_I);
// soxr_quality_spec_t q_spec = soxr_quality_spec(SOXR_HQ, 0);
// soxr_ = soxr_create(static_cast<double>(input_rate_), static_cast<double>(format_.rate), format_.channels, &error, &iospec, &q_spec, NULL);
// if (error)
// {
// LOG(ERROR) << "Error soxr_create: " << error << "\n";
// }
if ((format_.rate != in_format_.rate) || (format_.bits != in_format_.bits))
{
LOG(INFO) << "Resampling from " << in_format_.getFormat() << " to " << format_.getFormat() << "\n";
soxr_error_t error;
soxr_datatype_t in_type = SOXR_INT16_I;
soxr_datatype_t out_type = SOXR_INT16_I;
if (in_format_.sampleSize > 2)
in_type = SOXR_INT32_I;
if (format_.sampleSize > 2)
out_type = SOXR_INT32_I;
soxr_io_spec_t iospec = soxr_io_spec(in_type, out_type);
// HQ should be fine: http://sox.sourceforge.net/Docs/FAQ
soxr_quality_spec_t q_spec = soxr_quality_spec(SOXR_HQ, 0);
soxr_ = soxr_create(static_cast<double>(in_format_.rate), static_cast<double>(format_.rate), format_.channels, &error, &iospec, &q_spec, NULL);
if (error)
{
LOG(ERROR) << "Error soxr_create: " << error << "\n";
}
// initialize the buffer with 20ms (~latency of the reampler)
resample_buffer_.resize(format_.frameSize * ceil(format_.msRate()) * 20);
}
}
Stream::~Stream()
{
if (soxr_)
soxr_delete(soxr_);
}
@ -75,7 +98,6 @@ void Stream::setBufferLen(size_t bufferLenMs)
}
void Stream::clearChunks()
{
while (chunks_.size() > 0)
@ -89,41 +111,85 @@ void Stream::addChunk(unique_ptr<msg::PcmChunk> chunk)
while (chunks_.size() * chunk->duration<cs::msec>().count() > 10000)
chunks_.pop();
chunks_.push(move(chunk));
// chunks_.push(move(chunk));
// LOG(DEBUG) << "new chunk: " << chunk->duration<cs::msec>().count() << ", Chunks: " << chunks_.size() << "\n";
// if (std::abs(input_rate_ - output_rate_) <= 0.0000001)
// {
// chunks_.push(shared_ptr<msg::PcmChunk>(chunk));
// }
// else
// {
// size_t idone;
// size_t odone;
// auto out = new msg::PcmChunk(format_, 0);
// out->timestamp = chunk->timestamp;
// out->payloadSize = ceil(chunk->payloadSize * static_cast<double>(output_rate_) / static_cast<double>(input_rate_));
// out->payload = (char*)malloc(out->payloadSize);
if (soxr_ == nullptr)
{
chunks_.push(move(chunk));
}
else
{
size_t idone;
size_t odone;
// soxr_io_spec_t iospec = soxr_io_spec(SOXR_INT16_I, SOXR_INT16_I);
// soxr_quality_spec_t q_spec = soxr_quality_spec(SOXR_HQ, 0);
// // auto error = soxr_oneshot(static_cast<double>(input_rate_), output_rate_, format_.channels, chunk->payload, chunk->getFrameCount(), &idone,
// // out->payload, out->payloadSize, &odone, &iospec, &q_spec, nullptr);
// auto error = soxr_process(soxr_, chunk->payload, chunk->getFrameCount(), &idone, out->payload, out->getFrameCount(), &odone);
// if (error)
// {
// LOG(ERROR) << "Error soxr_process: " << error << "\n";
if (in_format_.bits == 24)
{
// sox expects 32 bit input, shift 8 bits left
int32_t* frames = (int32_t*)chunk->payload;
for (size_t n = 0; n < chunk->getSampleCount(); ++n)
frames[n] = frames[n] << 8;
}
auto resample_buffer_framesize = resample_buffer_.size() / format_.frameSize;
auto error = soxr_process(soxr_, chunk->payload, chunk->getFrameCount(), &idone, resample_buffer_.data(), resample_buffer_framesize, &odone);
if (error)
{
LOG(ERROR) << "Error soxr_process: " << error << "\n";
// delete out;
// }
// else
// {
// out->payloadSize = odone * out->format.frameSize;
// LOG(TRACE) << "Resample idone: " << idone << "/" << chunk->getFrameCount() << ", odone: " << odone << "/"
// << out->payloadSize / out->format.frameSize << "\n";
// chunks_.push(shared_ptr<msg::PcmChunk>(out));
// }
// delete chunk;
// }
}
else
{
LOG(TRACE) << "Resample idone: " << idone << "/" << chunk->getFrameCount() << ", odone: " << odone << "/"
<< resample_buffer_.size() / format_.frameSize << ", delay: " << soxr_delay(soxr_) << "\n";
// some data has been resampled (odone frames) and some is still in the pipe (soxr_delay frames)
if (odone > 0)
{
// get the resamples ts from the input ts
auto input_end_ts = chunk->start() + chunk->duration<std::chrono::microseconds>();
double resampled_ms = (odone + soxr_delay(soxr_)) / format_.msRate();
auto resampled_start = input_end_ts - std::chrono::microseconds(static_cast<int>(resampled_ms * 1000.));
auto resampled_chunk = new msg::PcmChunk(format_, 0);
auto us = chrono::duration_cast<chrono::microseconds>(resampled_start.time_since_epoch()).count();
resampled_chunk->timestamp.sec = us / 1000000;
resampled_chunk->timestamp.usec = us % 1000000;
// copy from the resample_buffer to the resampled chunk
resampled_chunk->payloadSize = odone * format_.frameSize;
resampled_chunk->payload = (char*)realloc(resampled_chunk->payload, resampled_chunk->payloadSize);
memcpy(resampled_chunk->payload, resample_buffer_.data(), resampled_chunk->payloadSize);
if (format_.bits == 24)
{
// sox has quantized to 32 bit, shift 8 bits right
int32_t* frames = (int32_t*)resampled_chunk->payload;
for (size_t n = 0; n < resampled_chunk->getSampleCount(); ++n)
{
// +128 to round to the nearest so that quantisation steps are distributed evenly
frames[n] = (frames[n] + 128) >> 8;
if (frames[n] > 0x7fffffff)
frames[n] = 0x7fffffff;
}
}
chunks_.push(shared_ptr<msg::PcmChunk>(resampled_chunk));
// check if the resample_buffer is large enough, or if soxr was using all available space
if (odone == resample_buffer_framesize)
{
// buffer for resampled data too small, add space for 5ms
resample_buffer_.resize(resample_buffer_.size() + format_.frameSize * ceil(format_.msRate()) * 5);
LOG(INFO) << "Resample buffer completely filled, adding space for 5ms; new buffer size: " << resample_buffer_.size() << " bytes\n";
}
// //LOG(TRACE) << "ts: " << out->timestamp.sec << "s, " << out->timestamp.usec/1000.f << " ms, duration: " << odone / format_.msRate() << "\n";
// int64_t next_us = us + static_cast<int64_t>(odone / format_.msRate() * 1000);
// LOG(TRACE) << "ts: " << us << ", next: " << next_us << ", diff: " << next_us_ - us << "\n";
// next_us_ = next_us;
}
}
}
}
@ -134,12 +200,12 @@ bool Stream::waitForChunk(size_t ms) const
cs::time_point_clk Stream::getSilentPlayerChunk(void* outputBuffer, unsigned long framesPerBuffer)
cs::time_point_clk Stream::getSilentPlayerChunk(void* outputBuffer, unsigned long frames)
{
if (!chunk_)
chunk_ = chunks_.pop();
cs::time_point_clk tp = chunk_->start();
memset(outputBuffer, 0, framesPerBuffer * format_.frameSize);
memset(outputBuffer, 0, frames * format_.frameSize);
return tp;
}
@ -182,16 +248,16 @@ time_point_clk Stream::seek(long ms)
*/
cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec& timeout, unsigned long framesPerBuffer)
cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec& timeout, unsigned long frames)
{
if (!chunk_ && !chunks_.try_pop(chunk_, timeout))
throw 0;
cs::time_point_clk tp = chunk_->start();
unsigned long read = 0;
while (read < framesPerBuffer)
while (read < frames)
{
read += chunk_->readFrames(static_cast<char*>(outputBuffer) + read * format_.frameSize, framesPerBuffer - read);
read += chunk_->readFrames(static_cast<char*>(outputBuffer) + read * format_.frameSize, frames - read);
if (chunk_->isEndOfChunk() && !chunks_.try_pop(chunk_, timeout))
throw 0;
}
@ -199,22 +265,24 @@ cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec
}
cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec& timeout, unsigned long framesPerBuffer, long framesCorrection)
cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec& timeout, unsigned long frames, long framesCorrection)
{
if (framesCorrection < 0 && framesPerBuffer + framesCorrection <= 0)
if (framesCorrection < 0 && frames + framesCorrection <= 0)
{
// Avoid underflow in new char[] constructor.
framesCorrection = -framesPerBuffer + 1;
framesCorrection = -frames + 1;
}
if (framesCorrection == 0)
return getNextPlayerChunk(outputBuffer, timeout, framesPerBuffer);
frame_delta_ -= framesCorrection;
long toRead = framesPerBuffer + framesCorrection;
if (framesCorrection == 0)
return getNextPlayerChunk(outputBuffer, timeout, frames);
long toRead = frames + framesCorrection;
char* buffer = new char[toRead * format_.frameSize];
cs::time_point_clk tp = getNextPlayerChunk(buffer, timeout, toRead);
const auto max = framesCorrection < 0 ? framesPerBuffer : toRead;
const auto max = framesCorrection < 0 ? frames : toRead;
// Divide the buffer into one more slice than frames that need to be dropped.
// We will drop/repeat 0 frames from the first slice, 1 frame from the second, ..., and framesCorrection frames from the last slice.
size_t slices = abs(framesCorrection) + 1;
@ -228,42 +296,34 @@ cs::time_point_clk Stream::getNextPlayerChunk(void* outputBuffer, const cs::usec
// Size of each slice. The last slice may be bigger.
int size = max / slices;
// LOG(TRACE) << "getNextPlayerChunk, frames: " << framesPerBuffer << ", correction: " << framesCorrection << " (" << toRead << "), slices: " << slices
// LOG(TRACE) << "getNextPlayerChunk, frames: " << frames << ", correction: " << framesCorrection << " (" << toRead << "), slices: " << slices
// << "\n";
size_t pos = 0;
for (size_t n = 0; n < slices; ++n)
{
if (n + 1 == slices)
// Adjust size in the last iteration, because the last slice may be bigger
if (n + 1 == slices)
size = max - pos;
if (framesCorrection < 0)
{
// Read one frame less per slice from the input, but write a duplicated frame per slice to the output
// LOG(TRACE) << "slice: " << n << ", size: " << size << ", out pos: " << pos << ", source pos: " << pos - n << "\n";
// LOG(TRACE) << "duplicate - requested: " << frames << ", read: " << toRead << ", slice: " << n << ", size: " << size << ", out pos: " << pos << ",
// source pos: " << pos - n << "\n";
memcpy(static_cast<char*>(outputBuffer) + pos * format_.frameSize, buffer + (pos - n) * format_.frameSize, size * format_.frameSize);
}
else
{
// Read all input frames, but skip a frame per slice when writing to the output.
// LOG(TRACE) << "slice: " << n << ", size: " << size << ", out pos: " << pos - n << ", source pos: " << pos << "\n";
// LOG(TRACE) << "remove - requested: " << frames << ", read: " << toRead << ", slice: " << n << ", size: " << size << ", out pos: " << pos - n <<
// ", source pos: " << pos << "\n";
memcpy(static_cast<char*>(outputBuffer) + (pos - n) * format_.frameSize, buffer + pos * format_.frameSize, size * format_.frameSize);
}
pos += size;
}
// float idx = 0;
// for (size_t n = 0; n < framesPerBuffer; ++n)
// {
// size_t index(floor(idx)); // = (int)(ceil(n*factor));
// memcpy((char*)outputBuffer + n * format_.frameSize, buffer + index * format_.frameSize, format_.frameSize);
// idx += factor;
// }
delete[] buffer;
return tp;
}
@ -312,7 +372,7 @@ void Stream::resetBuffers()
}
bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacTime, unsigned long framesPerBuffer)
bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacTime, unsigned long frames)
{
if (outputBufferDacTime > bufferMs_)
{
@ -328,7 +388,7 @@ bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacT
return false;
}
playedFrames_ += framesPerBuffer;
playedFrames_ += frames;
/// we have a chunk
/// age = chunk age (server now - rec time: some positive value) - buffer (e.g. 1000ms) + time to DAC
@ -346,8 +406,8 @@ bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacT
try
{
// LOG(DEBUG) << "framesPerBuffer: " << framesPerBuffer << "\tms: " << framesPerBuffer*2 / PLAYER_CHUNK_MS_SIZE << "\t" << PLAYER_CHUNK_SIZE << "\n";
cs::nsec bufferDuration = cs::nsec(static_cast<cs::nsec::rep>(framesPerBuffer / format_.nsRate()));
// LOG(DEBUG) << "frames: " << frames << "\tms: " << frames*2 / PLAYER_CHUNK_MS_SIZE << "\t" << PLAYER_CHUNK_SIZE << "\n";
cs::nsec bufferDuration = cs::nsec(static_cast<cs::nsec::rep>(frames / format_.nsRate()));
// LOG(DEBUG) << "buffer duration: " << bufferDuration.count() << "\n";
cs::usec correction = cs::usec(0);
@ -358,8 +418,8 @@ bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacT
{
LOG(INFO) << "sleep < -bufferDuration/2: " << cs::duration<cs::msec>(sleep_) << " < " << -cs::duration<cs::msec>(bufferDuration) / 2 << ", ";
// We're early: not enough chunks_. play silence. Reference chunk_ is the oldest (front) one
sleep_ = chrono::duration_cast<cs::usec>(TimeProvider::serverNow() - getSilentPlayerChunk(outputBuffer, framesPerBuffer) - bufferMs_ +
outputBufferDacTime);
sleep_ =
chrono::duration_cast<cs::usec>(TimeProvider::serverNow() - getSilentPlayerChunk(outputBuffer, frames) - bufferMs_ + outputBufferDacTime);
LOG(INFO) << "sleep: " << cs::duration<cs::msec>(sleep_) << "\n";
if (sleep_ < -bufferDuration / 2)
return true;
@ -413,9 +473,8 @@ bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacT
playedFrames_ = 0; //-= abs(correctAfterXFrames_);
}
age = std::chrono::duration_cast<cs::usec>(TimeProvider::serverNow() -
getNextPlayerChunk(outputBuffer, outputBufferDacTime, framesPerBuffer, framesCorrection) - bufferMs_ +
outputBufferDacTime);
age = std::chrono::duration_cast<cs::usec>(TimeProvider::serverNow() - getNextPlayerChunk(outputBuffer, outputBufferDacTime, frames, framesCorrection) -
bufferMs_ + outputBufferDacTime);
setRealSampleRate(format_.rate);
if (sleep_.count() == 0)
@ -495,9 +554,10 @@ bool Stream::getPlayerChunk(void* outputBuffer, const cs::usec& outputBufferDacT
median_ = buffer_.median();
shortMedian_ = shortBuffer_.median();
LOG(INFO) << "Chunk: " << age.count() / 100 << "\t" << miniBuffer_.median() / 100 << "\t" << shortMedian_ / 100 << "\t" << median_ / 100 << "\t"
<< buffer_.size() << "\t" << cs::duration<cs::msec>(outputBufferDacTime) << "\n";
<< buffer_.size() << "\t" << cs::duration<cs::msec>(outputBufferDacTime) << "\t" << frame_delta_ << "\n";
// LOG(INFO) << "Chunk: " << age.count()/1000 << "\t" << miniBuffer_.median()/1000 << "\t" << shortMedian_/1000 << "\t" << median_/1000 << "\t" <<
// buffer_.size() << "\t" << cs::duration<cs::msec>(outputBufferDacTime) << "\n";
frame_delta_ = 0;
}
return (abs(cs::duration<cs::msec>(age)) < 500);
}

20
client/stream.hpp
View file

@ -26,7 +26,7 @@
#include "message/pcm_chunk.hpp"
#include <deque>
#include <memory>
// #include <soxr.h>
#include <soxr.h>
/// Time synchronized audio stream
@ -37,7 +37,8 @@
class Stream
{
public:
Stream(const SampleFormat& format);
Stream(const SampleFormat& in_format, const SampleFormat& out_format);
virtual ~Stream();
/// Adds PCM data to the queue
void addChunk(std::unique_ptr<msg::PcmChunk> chunk);
@ -58,9 +59,9 @@ public:
bool waitForChunk(size_t ms) const;
private:
chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer);
chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer, long framesCorrection);
chronos::time_point_clk getSilentPlayerChunk(void* outputBuffer, unsigned long framesPerBuffer);
chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long frames);
chronos::time_point_clk getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long frames, long framesCorrection);
chronos::time_point_clk getSilentPlayerChunk(void* outputBuffer, unsigned long frames);
chronos::time_point_clk seek(long ms);
// time_point_ms seekTo(const time_point_ms& to);
void updateBuffers(int age);
@ -68,6 +69,7 @@ private:
void setRealSampleRate(double sampleRate);
SampleFormat format_;
SampleFormat in_format_;
chronos::usec sleep_;
@ -84,9 +86,11 @@ private:
unsigned long playedFrames_;
long correctAfterXFrames_;
chronos::msec bufferMs_;
// size_t input_rate_;
// double output_rate_;
// soxr_t soxr_;
soxr_t soxr_;
std::vector<char> resample_buffer_;
int frame_delta_;
// int64_t next_us_;
};

5
common/sample_format.cpp
View file

@ -30,7 +30,10 @@
using namespace std;
SampleFormat::SampleFormat() = default;
SampleFormat::SampleFormat()
{
setFormat(0, 0, 0);
}
SampleFormat::SampleFormat(const std::string& format)

18
externals/Makefile vendored
View file

@ -14,9 +14,9 @@
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
.PHONY: all check-env flac ogg opus tremor oboe
.PHONY: all check-env flac ogg opus tremor oboe soxr
all: flac ogg opus tremor oboe
all: flac ogg opus tremor oboe soxr
check-env:
# if [ ! -d "flac" ]; then \
@ -128,3 +128,17 @@ oboe: check-env
make clean; \
cd ..; \
rm -rf build;
soxr: check-env
@cd /home/johannes/Develop/soxr; \
export CC="$(CC)"; \
export CXX="$(CXX)"; \
export CPPFLAGS="$(CPPFLAGS)"; \
mkdir build; \
cd build; \
cmake -DBUILD_SHARED_LIBS=OFF -DBUILD_TESTS=OFF -DWITH_OPENMP=OFF ..; \
make; \
make DESTDIR=$(NDK_DIR) install; \
make clean; \
cd ..; \
rm -rf build;