mirror of
https://github.com/badaix/snapcast.git
synced 2025-05-01 11:17:36 +02:00
323 lines
9 KiB
C++
323 lines
9 KiB
C++
#include "stream.h"
|
|
#include <iostream>
|
|
#include <string.h>
|
|
#include "common/log.h"
|
|
#include "timeProvider.h"
|
|
|
|
using namespace std;
|
|
using namespace chronos;
|
|
|
|
|
|
Stream::Stream(const msg::SampleFormat& sampleFormat) : format(format_), format_(sampleFormat), sleep(0), median(0), shortMedian(0), lastUpdate(0), playedFrames(0)
|
|
{
|
|
buffer.setSize(500);
|
|
shortBuffer.setSize(100);
|
|
miniBuffer.setSize(20);
|
|
// cardBuffer.setSize(50);
|
|
bufferMs = msec(500);
|
|
|
|
/*
|
|
48000 x
|
|
------- = -----
|
|
47999,2 x - 1
|
|
|
|
x = 1,000016667 / (1,000016667 - 1)
|
|
*/
|
|
setRealSampleRate(format.rate);
|
|
}
|
|
|
|
|
|
void Stream::setRealSampleRate(double sampleRate)
|
|
{
|
|
if (sampleRate == format.rate)
|
|
correctAfterXFrames = 0;
|
|
else
|
|
correctAfterXFrames = round((format.rate / sampleRate) / (format.rate / sampleRate - 1.));
|
|
// cout << "Correct after X: " << correctAfterXFrames << " (Real rate: " << sampleRate << ", rate: " << format.rate << ")\n";
|
|
}
|
|
|
|
|
|
void Stream::setBufferLen(size_t bufferLenMs)
|
|
{
|
|
bufferMs = msec(bufferLenMs);
|
|
}
|
|
|
|
|
|
|
|
void Stream::clearChunks()
|
|
{
|
|
while (chunks.size() > 0)
|
|
chunks.pop();
|
|
}
|
|
|
|
|
|
void Stream::addChunk(msg::PcmChunk* chunk)
|
|
{
|
|
while (chunks.size() * chunk->duration<chronos::msec>().count() > 10000)
|
|
chunks.pop();
|
|
chunks.push(shared_ptr<msg::PcmChunk>(chunk));
|
|
// cout << "new chunk: " << chunk->getDuration() << ", Chunks: " << chunks.size() << "\n";
|
|
}
|
|
|
|
|
|
|
|
time_point_hrc Stream::getSilentPlayerChunk(void* outputBuffer, unsigned long framesPerBuffer)
|
|
{
|
|
if (!chunk)
|
|
chunk = chunks.pop();
|
|
time_point_hrc tp = chunk->start();
|
|
memset(outputBuffer, 0, framesPerBuffer * format.frameSize);
|
|
return tp;
|
|
}
|
|
|
|
|
|
/*
|
|
time_point_ms Stream::seekTo(const time_point_ms& to)
|
|
{
|
|
if (!chunk)
|
|
chunk = chunks.pop();
|
|
// time_point_ms tp = chunk->timePoint();
|
|
while (to > chunk->timePoint())// + std::chrono::milliseconds((long int)chunk->getDuration()))//
|
|
{
|
|
chunk = chunks.pop();
|
|
cout << "\nto: " << Chunk::getAge(to) << "\t chunk: " << Chunk::getAge(chunk->timePoint()) << "\n";
|
|
cout << "diff: " << std::chrono::duration_cast<std::chrono::milliseconds>((to - chunk->timePoint())).count() << "\n";
|
|
}
|
|
chunk->seek(std::chrono::duration_cast<std::chrono::milliseconds>(to - chunk->timePoint()).count() * format.msRate());
|
|
return chunk->timePoint();
|
|
}
|
|
*/
|
|
|
|
/*
|
|
time_point_hrc Stream::seek(long ms)
|
|
{
|
|
if (!chunk)
|
|
chunk = chunks.pop();
|
|
|
|
if (ms <= 0)
|
|
return chunk->start();
|
|
|
|
// time_point_ms tp = chunk->timePoint();
|
|
while (ms > chunk->duration<chronos::msec>().count())
|
|
{
|
|
chunk = chunks.pop();
|
|
ms -= min(ms, (long)chunk->durationLeft<chronos::msec>().count());
|
|
}
|
|
chunk->seek(ms * format.msRate());
|
|
return chunk->start();
|
|
}
|
|
*/
|
|
|
|
|
|
time_point_hrc Stream::getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer)
|
|
{
|
|
if (!chunk && !chunks.try_pop(chunk, timeout))
|
|
throw 0;
|
|
|
|
time_point_hrc tp = chunk->start();
|
|
char* buffer = (char*)outputBuffer;
|
|
unsigned long read = 0;
|
|
while (read < framesPerBuffer)
|
|
{
|
|
read += chunk->readFrames(buffer + read*format.frameSize, framesPerBuffer - read);
|
|
if (chunk->isEndOfChunk() && !chunks.try_pop(chunk, timeout))
|
|
throw 0;
|
|
}
|
|
return tp;
|
|
}
|
|
|
|
|
|
time_point_hrc Stream::getNextPlayerChunk(void* outputBuffer, const chronos::usec& timeout, unsigned long framesPerBuffer, long framesCorrection)
|
|
{
|
|
if (framesCorrection == 0)
|
|
return getNextPlayerChunk(outputBuffer, timeout, framesPerBuffer);
|
|
|
|
long toRead = framesPerBuffer + framesCorrection;
|
|
char* buffer = (char*)malloc(toRead * format.frameSize);
|
|
time_point_hrc tp = getNextPlayerChunk(buffer, timeout, toRead);
|
|
|
|
float factor = (float)toRead / framesPerBuffer;//(float)(framesPerBuffer*channels_);
|
|
if (abs(framesCorrection) > 1)
|
|
std::cout << "correction: " << framesCorrection << ", factor: " << factor << "\n";
|
|
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;
|
|
}
|
|
free(buffer);
|
|
|
|
return tp;
|
|
}
|
|
|
|
|
|
|
|
void Stream::updateBuffers(int age)
|
|
{
|
|
buffer.add(age);
|
|
miniBuffer.add(age);
|
|
shortBuffer.add(age);
|
|
}
|
|
|
|
|
|
void Stream::resetBuffers()
|
|
{
|
|
buffer.clear();
|
|
miniBuffer.clear();
|
|
shortBuffer.clear();
|
|
}
|
|
|
|
|
|
|
|
bool Stream::getPlayerChunk(void* outputBuffer, const chronos::usec& outputBufferDacTime, unsigned long framesPerBuffer)
|
|
{
|
|
if (outputBufferDacTime > bufferMs)
|
|
return false;
|
|
|
|
if (!chunk && !chunks.try_pop(chunk, outputBufferDacTime))
|
|
return false;
|
|
|
|
playedFrames += framesPerBuffer;
|
|
|
|
chronos::usec age = std::chrono::duration_cast<usec>(TimeProvider::serverNow() - chunk->start() - bufferMs + outputBufferDacTime);
|
|
if ((sleep.count() == 0) && (chronos::abs(age) > chronos::msec(200)))
|
|
{
|
|
cout << "age > 200: " << age.count() << "\n";
|
|
sleep = age;
|
|
}
|
|
|
|
try
|
|
{
|
|
|
|
//cout << "framesPerBuffer: " << framesPerBuffer << "\tms: " << framesPerBuffer*2 / PLAYER_CHUNK_MS_SIZE << "\t" << PLAYER_CHUNK_SIZE << "\n";
|
|
chronos::nsec bufferDuration = chronos::nsec(chronos::usec::rep(framesPerBuffer / format_.nsRate()));
|
|
// cout << "buffer duration: " << bufferDuration.count() << "\n";
|
|
|
|
chronos::usec correction = chronos::usec(0);
|
|
if (sleep.count() != 0)
|
|
{
|
|
resetBuffers();
|
|
if (sleep < -bufferDuration/2)
|
|
{
|
|
// We're early: not enough chunks. play silence. Reference chunk is the oldest (front) one
|
|
sleep = chrono::duration_cast<usec>(TimeProvider::serverNow() - getSilentPlayerChunk(outputBuffer, framesPerBuffer) - bufferMs + outputBufferDacTime);
|
|
//cout << "-sleep: " << sleep.count() << " " << -bufferDuration.count() / 2000 << "\n";
|
|
if (sleep < -bufferDuration/2)
|
|
return true;
|
|
}
|
|
else if (sleep > bufferDuration/2)
|
|
{
|
|
// We're late: discard oldest chunks
|
|
while (sleep > chunk->duration<chronos::usec>())
|
|
{
|
|
cout << "sleep > chunk->getDuration(): " << sleep.count() << " > " << chunk->duration<chronos::msec>().count() << ", chunks: " << chunks.size() << ", out: " << outputBufferDacTime.count() << ", needed: " << bufferDuration.count() << "\n";
|
|
sleep = std::chrono::duration_cast<usec>(TimeProvider::serverNow() - chunk->start() - bufferMs + outputBufferDacTime);
|
|
if (!chunks.try_pop(chunk, outputBufferDacTime))
|
|
{
|
|
cout << "no chunks available\n";
|
|
chunk = NULL;
|
|
sleep = chronos::usec(0);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// out of sync, can be corrected by playing faster/slower
|
|
if (sleep < -chronos::usec(100))
|
|
{
|
|
sleep += chronos::usec(100);
|
|
correction = -chronos::usec(100);
|
|
}
|
|
else if (sleep > chronos::usec(100))
|
|
{
|
|
sleep -= chronos::usec(100);
|
|
correction = chronos::usec(100);
|
|
}
|
|
else
|
|
{
|
|
cout << "Sleep " << sleep.count() << "\n";
|
|
correction = sleep;
|
|
sleep = chronos::usec(0);
|
|
}
|
|
}
|
|
|
|
long framesCorrection = correction.count()*format.usRate();
|
|
if ((correctAfterXFrames != 0) && (playedFrames >= (unsigned long)abs(correctAfterXFrames)))
|
|
{
|
|
framesCorrection += (correctAfterXFrames > 0)?1:-1;
|
|
playedFrames -= abs(correctAfterXFrames);
|
|
}
|
|
|
|
age = std::chrono::duration_cast<usec>(TimeProvider::serverNow() - getNextPlayerChunk(outputBuffer, outputBufferDacTime, framesPerBuffer, framesCorrection) - bufferMs + outputBufferDacTime);
|
|
|
|
setRealSampleRate(format.rate);
|
|
if (sleep.count() == 0)
|
|
{
|
|
if (buffer.full())
|
|
{
|
|
if (chronos::usec(abs(median)) > chronos::msec(1))
|
|
{
|
|
cout << "pBuffer->full() && (abs(median) > 1): " << median << "\n";
|
|
sleep = chronos::usec(shortMedian);
|
|
}
|
|
/* else if (chronos::usec(median) > chronos::usec(300))
|
|
{
|
|
setRealSampleRate(format.rate - format.rate / 1000);
|
|
}
|
|
else if (chronos::usec(median) < -chronos::usec(300))
|
|
{
|
|
setRealSampleRate(format.rate + format.rate / 1000);
|
|
}
|
|
*/ }
|
|
else if (shortBuffer.full())
|
|
{
|
|
if (chronos::usec(abs(shortMedian)) > chronos::msec(5))
|
|
{
|
|
cout << "pShortBuffer->full() && (abs(shortMedian) > 5): " << shortMedian << "\n";
|
|
sleep = chronos::usec(shortMedian);
|
|
}
|
|
/* else
|
|
{
|
|
setRealSampleRate(format.rate + -shortMedian / 100);
|
|
}
|
|
*/ }
|
|
else if (miniBuffer.full() && (chronos::usec(abs(miniBuffer.median())) > chronos::msec(50)))
|
|
{
|
|
cout << "pMiniBuffer->full() && (abs(pMiniBuffer->mean()) > 50): " << miniBuffer.median() << "\n";
|
|
sleep = chronos::usec((chronos::msec::rep)miniBuffer.mean());
|
|
}
|
|
}
|
|
|
|
if (sleep.count() != 0)
|
|
std::cerr << "Sleep: " << sleep.count() << "\n";
|
|
else if (shortBuffer.full())
|
|
{
|
|
if (chronos::usec(shortMedian) > chronos::usec(100))
|
|
setRealSampleRate(format.rate * 0.9999);
|
|
else if (chronos::usec(shortMedian) < -chronos::usec(100))
|
|
setRealSampleRate(format.rate * 1.0001);
|
|
}
|
|
|
|
updateBuffers(age.count());
|
|
|
|
// print sync stats
|
|
time_t now = time(NULL);
|
|
if (now != lastUpdate)
|
|
{
|
|
lastUpdate = now;
|
|
median = buffer.median();
|
|
shortMedian = shortBuffer.median();
|
|
std::cerr << "Chunk: " << age.count()/100 << "\t" << miniBuffer.median()/100 << "\t" << shortMedian/100 << "\t" << median/100 << "\t" << buffer.size() << "\t" << outputBufferDacTime.count() << "\n";
|
|
}
|
|
return true;
|
|
}
|
|
catch(int e)
|
|
{
|
|
sleep = chronos::usec(0);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
|