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Merge pull request #108 from markondej/rpi4-fix 

Rpi4 fix
pull/117/head 0.9.4
Marcin Kondej 2020-03-30 10:28:45 +02:00 zatwierdzone przez GitHub
rodzic 7c623eb5df f4c1d038e6
commit 24d1a85f69
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13
README.md
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@ -25,11 +25,22 @@ Other options:
* -r - Loops the playback
After transmission has begun, simply tune an FM receiver to chosen frequency, You should hear the playback.
### Raspberry Pi 4
On Raspberry Pi 4 other built-in hardware probably interfers somehow with this software making transmitting not possible on all standard FM broadcasting frequencies. In this case it is recommended to:
1. Compile executable with option to use GPIO21 instead of GPIO4 (PIN 40 on GPIO header):
```
make GPIO21=1
```
2. Change either ARM core frequency scaling governor settings to "performance" or to change ARM minium and maximum core frequencies to one constant value (see: https://www.raspberrypi.org/forums/viewtopic.php?t=152692 ).
```
echo "performance"| sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
```
3. Using lower FM broadcasting frequencies (below 93 MHz) when transmitting.
### Supported audio formats
You can transmitt uncompressed WAV (.wav) files directly or read audio data from stdin, eg.:
```
sudo apt-get install sox
sox star_wars.wav -r 22050 -c 1 -b 16 -t wav - | sudo ./fm_transmitter -f 100.6 -
sox acoustic_guitar_duet.wav -r 22050 -c 1 -b 16 -t wav - | sudo ./fm_transmitter -f 100.6 -
```
Please note only uncompressed WAV files are supported. If you receive the "corrupted data" error try converting the file, eg. by using SoX:
```

38
main.cpp
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@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -37,21 +37,21 @@
#include <iostream>
#include <unistd.h>
bool play = true;
Transmitter *transmitter = NULL;
bool stop = false;
Transmitter *transmitter = nullptr;
void sigIntHandler(int sigNum)
{
if (transmitter != NULL) {
if (transmitter != nullptr) {
std::cout << "Stopping..." << std::endl;
transmitter->stop();
play = false;
transmitter->Stop();
stop = true;
}
}
int main(int argc, char** argv)
{
float frequency = 100.f, bandwidth = 100.f;
float frequency = 100.f, bandwidth = 200.f;
uint16_t dmaChannel = 0;
bool showUsage = true, loop = false;
int opt, filesOffset;
@ -87,27 +87,33 @@ int main(int argc, char** argv)
signal(SIGINT, sigIntHandler);
signal(SIGTSTP, sigIntHandler);
auto finally = [&]() {
delete transmitter;
transmitter = nullptr;
};
try {
transmitter = &Transmitter::getInstance();
transmitter = new Transmitter();
std::cout << "Broadcasting at " << frequency << " MHz with "
<< bandwidth << " kHz bandwidth" << std::endl;
do {
std::string filename = argv[optind++];
if ((optind == argc) && loop) {
optind = filesOffset;
}
WaveReader reader(filename != "-" ? filename : std::string(), play);
PCMWaveHeader header = reader.getHeader();
std::cout << "Broadcasting at " << frequency << " MHz with "
<< bandwidth << " kHz bandwidth" << std::endl;
std::cout << "Playing: " << reader.getFilename() << ", "
WaveReader reader(filename != "-" ? filename : std::string(), stop);
WaveHeader header = reader.GetHeader();
std::cout << "Playing: " << reader.GetFilename() << ", "
<< header.sampleRate << " Hz, "
<< header.bitsPerSample << " bits, "
<< ((header.channels > 0x01) ? "stereo" : "mono") << std::endl;
transmitter->transmit(reader, frequency, bandwidth, dmaChannel, optind < argc);
} while (play && (optind < argc));
transmitter->Transmit(reader, frequency, bandwidth, dmaChannel, optind < argc);
} while (!stop && (optind < argc));
} catch (std::exception &catched) {
std::cout << "Error: " << catched.what() << std::endl;
finally();
return 1;
}
finally();
return 0;
}

8
makefile
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@ -1,6 +1,10 @@
EXECUTABLE = fm_transmitter
VERSION = 0.9.3
VERSION = 0.9.4
FLAGS = -Wall -O3 -std=c++11
TRANSMITTER = -fno-strict-aliasing -I/opt/vc/include
ifeq ($(GPIO21), 1)
TRANSMITTER += -DGPIO21
endif
all: main.o mailbox.o sample.o wave_reader.o transmitter.o
g++ -L/opt/vc/lib -lm -lpthread -lbcm_host -o $(EXECUTABLE) main.o mailbox.o sample.o wave_reader.o transmitter.o
@ -15,7 +19,7 @@ wave_reader.o: wave_reader.cpp wave_reader.hpp
g++ $(FLAGS) -c wave_reader.cpp
transmitter.o: transmitter.cpp transmitter.hpp
g++ $(FLAGS) -fno-strict-aliasing -I/opt/vc/include -c transmitter.cpp
g++ $(FLAGS) $(TRANSMITTER) -c transmitter.cpp
main.o: main.cpp
g++ $(FLAGS) -DVERSION=\"$(VERSION)\" -DEXECUTABLE=\"$(EXECUTABLE)\" -c main.cpp

58
pcm_wave_header.hpp
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@ -1,58 +0,0 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or other
materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be
used to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PCM_WAVE_HEADER_HPP
#define PCM_WAVE_HEADER_HPP
#include <cstdint>
#define WAVE_FORMAT_PCM 0x0001
struct PCMWaveHeader
{
uint8_t chunkID[4];
uint32_t chunkSize;
uint8_t format[4];
uint8_t subchunk1ID[4];
uint32_t subchunk1Size;
uint16_t audioFormat;
uint16_t channels;
uint32_t sampleRate;
uint32_t byteRate;
uint16_t blockAlign;
uint16_t bitsPerSample;
uint8_t subchunk2ID[4];
uint32_t subchunk2Size;
};
#endif // PCM_WAVE_HEADER_HPP

26
sample.cpp
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@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -34,25 +34,27 @@
#include "sample.hpp"
#include <climits>
Sample::Sample(uint8_t *data, uint16_t channels, uint16_t bitsPerChannel)
Sample::Sample(uint8_t *data, unsigned channels, unsigned bitsPerChannel)
: value(0.f)
{
int32_t sum = 0;
int sum = 0;
int16_t *channelValues = new int16_t[channels];
int16_t multiplier = bitsPerChannel >> 3;
for (uint32_t i = 0; i < channels; i++) {
if (multiplier > 1) {
channelValues[i] = (data[(i + 1) * multiplier - 1] << 8) | data[(i + 1) * multiplier - 2];
} else {
for (unsigned i = 0; i < channels; i++) {
switch (bitsPerChannel >> 3) {
case 2:
channelValues[i] = (data[((i + 1) << 1) - 1] << 8) | data[((i + 1) << 1) - 2];
break;
case 1:
channelValues[i] = (static_cast<int16_t>(data[i]) - 0x80) << 8;
break;
}
sum += channelValues[i];
}
value = 2 * sum / channels / static_cast<float>(USHRT_MAX);
value = 2 * sum / (static_cast<float>(USHRT_MAX) * channels);
delete[] channelValues;
}
float Sample::getMonoValue() const
float Sample::GetMonoValue() const
{
return value;
}
}

8
sample.hpp
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@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -39,8 +39,8 @@
class Sample
{
public:
Sample(uint8_t *data, uint16_t channels, uint16_t bitsPerChannel);
float getMonoValue() const;
Sample(uint8_t *data, unsigned channels, unsigned bitsPerChannel);
float GetMonoValue() const;
protected:
float value;
};

557
transmitter.cpp
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@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -40,18 +40,19 @@
#include <fcntl.h>
#include <sys/mman.h>
#define PERIPHERALS_PHYS_BASE 0x7E000000
#define PERIPHERALS_PHYS_BASE 0x7e000000
#define BCM2835_PERI_VIRT_BASE 0x20000000
#define BCM2838_PERI_VIRT_BASE 0xFE000000
#define BCM2838_PERI_VIRT_BASE 0xfe000000
#define DMA0_BASE_OFFSET 0x00007000
#define DMA15_BASE_OFFSET 0x00E05000
#define DMA15_BASE_OFFSET 0x00e05000
#define CLK0_BASE_OFFSET 0x00101070
#define PWMCLK_BASE_OFFSET 0x001010A0
#define CLK1_BASE_OFFSET 0x00101078
#define PWMCLK_BASE_OFFSET 0x001010a0
#define GPIO_BASE_OFFSET 0x00200000
#define PWM_BASE_OFFSET 0x0020C000
#define PWM_BASE_OFFSET 0x0020c000
#define TIMER_BASE_OFFSET 0x00003000
#define BCM2835_MEM_FLAG 0x0C
#define BCM2835_MEM_FLAG 0x0c
#define BCM2838_MEM_FLAG 0x04
#define BCM2835_PLLD_FREQ 500
@ -113,240 +114,294 @@ struct DMARegisters {
uint32_t debug;
};
struct AllocatedMemory {
uint32_t handle, size, physicalBase, virtualBase;
int mBoxFd;
class Peripherals
{
public:
virtual ~Peripherals() {
munmap(peripherals, GetSize());
}
Peripherals(const Peripherals &) = delete;
Peripherals(Peripherals &&) = delete;
Peripherals &operator=(const Peripherals &) = delete;
static Peripherals &GetInstance() {
static Peripherals instance;
return instance;
}
inline uint32_t GetPhysicalAddress(volatile void *object) const {
return PERIPHERALS_PHYS_BASE + (reinterpret_cast<uint32_t>(object) - reinterpret_cast<uint32_t>(peripherals));
}
inline uint32_t GetVirtualAddress(uint32_t offset) const {
return reinterpret_cast<uint32_t>(peripherals) + offset;
}
inline static uint32_t GetVirtualBaseAddress() {
return (bcm_host_get_peripheral_size() == BCM2838_PERI_VIRT_BASE) ? BCM2838_PERI_VIRT_BASE : bcm_host_get_peripheral_address();
}
inline static float GetClockFrequency() {
return (Peripherals::GetVirtualBaseAddress() == BCM2838_PERI_VIRT_BASE) ? BCM2838_PLLD_FREQ : BCM2835_PLLD_FREQ;
}
private:
Peripherals() {
int memFd;
if ((memFd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
throw std::runtime_error("Cannot open /dev/mem file (permission denied)");
}
peripherals = mmap(nullptr, GetSize(), PROT_READ | PROT_WRITE, MAP_SHARED, memFd, GetVirtualBaseAddress());
close(memFd);
if (peripherals == MAP_FAILED) {
throw std::runtime_error("Cannot obtain access to peripherals (mmap error)");
}
}
unsigned GetSize() {
unsigned size = bcm_host_get_peripheral_size();
if (size == BCM2838_PERI_VIRT_BASE) {
size = 0x01000000;
}
return size;
}
void *peripherals;
};
class AllocatedMemory
{
public:
AllocatedMemory(unsigned size) {
mBoxFd = mbox_open();
memSize = size;
if (memSize % PAGE_SIZE) {
memSize = (memSize / PAGE_SIZE + 1) * PAGE_SIZE;
}
memHandle = mem_alloc(mBoxFd, size, PAGE_SIZE, (Peripherals::GetVirtualBaseAddress() == BCM2835_PERI_VIRT_BASE) ? BCM2835_MEM_FLAG : BCM2838_MEM_FLAG);
if (!memHandle) {
mbox_close(mBoxFd);
memSize = 0;
throw std::runtime_error("Cannot allocate memory (" + std::to_string(size) + "bytes");
}
memAddress = mem_lock(mBoxFd, memHandle);
memAllocated = mapmem(memAddress & ~0xc0000000, memSize);
}
virtual ~AllocatedMemory() {
unmapmem(memAllocated, memSize);
mem_unlock(mBoxFd, memHandle);
mem_free(mBoxFd, memHandle);
mbox_close(mBoxFd);
memSize = 0;
}
AllocatedMemory(const AllocatedMemory &) = delete;
AllocatedMemory(AllocatedMemory &&) = delete;
AllocatedMemory &operator=(const AllocatedMemory &) = delete;
inline uint32_t GetPhysicalAddress(volatile void *object) const {
return (memSize) ? memAddress + (reinterpret_cast<uint32_t>(object) - reinterpret_cast<uint32_t>(memAllocated)) : 0x00000000;
}
inline uint32_t GetAddress() const {
return reinterpret_cast<uint32_t>(memAllocated);
}
private:
unsigned memSize, memHandle;
uint32_t memAddress;
void *memAllocated;
int mBoxFd;
};
class Device
{
public:
Device() {
peripherals = &Peripherals::GetInstance();
}
Device(const Device &) = delete;
Device(Device &&) = delete;
Device &operator=(const Device &) = delete;
protected:
Peripherals *peripherals;
};
class ClockDevice : public Device
{
public:
ClockDevice(uint32_t clockAddress, unsigned divisor) {
clock = reinterpret_cast<ClockRegisters *>(peripherals->GetVirtualAddress(clockAddress));
clock->ctl = (0x5a << 24) | 0x06;
std::this_thread::sleep_for(std::chrono::microseconds(1000));
clock->div = (0x5a << 24) | (0xffffff & divisor);
clock->ctl = (0x5a << 24) | (0x01 << 9) | (0x01 << 4) | 0x06;
}
virtual ~ClockDevice() {
clock->ctl = (0x5a << 24) | 0x06;
}
protected:
volatile ClockRegisters *clock;
};
class ClockOutput : public ClockDevice
{
public:
#ifndef GPIO21
ClockOutput(unsigned divisor) : ClockDevice(CLK0_BASE_OFFSET, divisor) {
output = reinterpret_cast<uint32_t *>(peripherals->GetVirtualAddress(GPIO_BASE_OFFSET));
*output = (*output & 0xffff8fff) | (0x04 << 12);
#else
ClockOutput(unsigned divisor) : ClockDevice(CLK1_BASE_OFFSET, divisor) {
output = reinterpret_cast<uint32_t *>(peripherals->GetVirtualAddress(GPIO_BASE_OFFSET + 0x08));
*output = (*output & 0xffffffc7) | (0x02 << 3);
#endif
}
virtual ~ClockOutput() {
#ifndef GPIO21
*output = (*output & 0xffff8fff) | (0x01 << 12);
#else
*output = (*output & 0xffffffc7) | (0x02 << 3);
#endif
}
inline void SetDivisor(unsigned divisor) {
clock->div = (0x5a << 24) | (0xffffff & divisor);
}
inline volatile uint32_t &GetDivisor() {
return clock->div;
}
private:
volatile uint32_t *output;
};
class PWMController : public ClockDevice
{
public:
PWMController(unsigned sampleRate) : ClockDevice(PWMCLK_BASE_OFFSET, static_cast<unsigned>(Peripherals::GetClockFrequency() * 1000000.f * (0x01 << 12) / (PWM_WRITES_PER_SAMPLE * PWM_CHANNEL_RANGE * sampleRate))) {
pwm = reinterpret_cast<PWMRegisters *>(peripherals->GetVirtualAddress(PWM_BASE_OFFSET));
pwm->ctl = 0x00000000;
std::this_thread::sleep_for(std::chrono::microseconds(1000));
pwm->status = 0x01fc;
pwm->ctl = (0x01 << 6);
std::this_thread::sleep_for(std::chrono::microseconds(1000));
pwm->chn1Range = PWM_CHANNEL_RANGE;
pwm->dmaConf = (0x01 << 31) | 0x0707;
pwm->ctl = (0x01 << 5) | (0x01 << 2) | 0x01;
}
virtual ~PWMController() {
pwm->ctl = 0x00000000;
}
inline volatile uint32_t &GetFifoIn() {
return pwm->fifoIn;
}
private:
volatile PWMRegisters *pwm;
};
class DMAController : public Device
{
public:
DMAController(uint32_t controllBlockAddress, unsigned dmaChannel) {
dma = reinterpret_cast<DMARegisters *>(peripherals->GetVirtualAddress((dmaChannel < 15) ? DMA0_BASE_OFFSET + dmaChannel * 0x100 : DMA15_BASE_OFFSET));
dma->ctlStatus = (0x01 << 31);
std::this_thread::sleep_for(std::chrono::microseconds(1000));
dma->ctlStatus = (0x01 << 2) | (0x01 << 1);
dma->cbAddress = controllBlockAddress;
dma->ctlStatus = (0xff << 16) | 0x01;
}
virtual ~DMAController() {
dma->ctlStatus = (0x01 << 31);
}
inline void SetControllBlockAddress(uint32_t address) {
dma->cbAddress = address;
}
inline volatile uint32_t &GetControllBlockAddress() {
return dma->cbAddress;
}
private:
volatile DMARegisters *dma;
};
bool Transmitter::transmitting = false;
volatile ClockRegisters *Transmitter::output = nullptr;
uint32_t Transmitter::sampleOffset, Transmitter::clockDivisor, Transmitter::divisorRange, Transmitter::sampleRate;
std::vector<Sample> Transmitter::samples;
std::mutex Transmitter::samplesMutex;
void *Transmitter::peripherals;
Transmitter::Transmitter()
: output(nullptr), stopped(true)
{
int memFd;
if ((memFd = open("/dev/mem", O_RDWR | O_SYNC)) < 0) {
throw std::runtime_error("Cannot open /dev/mem (permission denied)");
}
}
peripherals = mmap(nullptr, getPeripheralsSize(), PROT_READ | PROT_WRITE, MAP_SHARED, memFd, getPeripheralsVirtBaseAddress());
close(memFd);
if (peripherals == MAP_FAILED) {
throw std::runtime_error("Cannot obtain access to peripherals (mmap error)");
Transmitter::~Transmitter() {
if (output != nullptr) {
delete output;
}
}
Transmitter::~Transmitter()
{
munmap(peripherals, getPeripheralsSize());
}
Transmitter &Transmitter::getInstance()
{
static Transmitter instance;
return instance;
}
uint32_t Transmitter::getPeripheralsVirtBaseAddress() const
{
return (bcm_host_get_peripheral_size() == BCM2838_PERI_VIRT_BASE) ? BCM2838_PERI_VIRT_BASE : bcm_host_get_peripheral_address();
}
uint32_t Transmitter::getPeripheralsSize() const
{
uint32_t size = bcm_host_get_peripheral_size();
if (size == BCM2838_PERI_VIRT_BASE) {
size = 0x01000000;
}
return size;
}
float Transmitter::getSourceFreq() const
{
return (getPeripheralsVirtBaseAddress() == BCM2838_PERI_VIRT_BASE) ? BCM2838_PLLD_FREQ : BCM2835_PLLD_FREQ;
}
uint32_t Transmitter::getPeripheralPhysAddress(volatile void *object) const
{
return PERIPHERALS_PHYS_BASE + (reinterpret_cast<uint32_t>(object) - reinterpret_cast<uint32_t>(peripherals));
}
uint32_t Transmitter::getPeripheralVirtAddress(uint32_t offset)
{
return reinterpret_cast<uint32_t>(peripherals) + offset;
}
uint32_t Transmitter::getMemoryPhysAddress(AllocatedMemory &memory, volatile void *object) const
{
return memory.physicalBase + (reinterpret_cast<uint32_t>(object) - memory.virtualBase);
}
AllocatedMemory Transmitter::allocateMemory(uint32_t size)
{
AllocatedMemory memory;
memory.size = 0x00000000;
memory.mBoxFd = mbox_open();
if (size % PAGE_SIZE) {
size = (size / PAGE_SIZE + 1) * PAGE_SIZE;
}
memory.handle = mem_alloc(memory.mBoxFd, size, PAGE_SIZE, (getPeripheralsVirtBaseAddress() == BCM2835_PERI_VIRT_BASE) ? BCM2835_MEM_FLAG : BCM2838_MEM_FLAG);
if (!memory.handle) {
mbox_close(memory.mBoxFd);
return memory;
}
memory.physicalBase = mem_lock(memory.mBoxFd, memory.handle);
memory.virtualBase = reinterpret_cast<uint32_t>(mapmem(memory.physicalBase & ~0xC0000000, size));
memory.size = size;
return memory;
}
void Transmitter::freeMemory(AllocatedMemory &memory)
{
unmapmem(reinterpret_cast<void *>(memory.virtualBase), memory.size);
mem_unlock(memory.mBoxFd, memory.handle);
mem_free(memory.mBoxFd, memory.handle);
mbox_close(memory.mBoxFd);
memory.size = 0x00000000;
}
volatile PWMRegisters *Transmitter::initPwmController()
{
volatile ClockRegisters *pwmClk = reinterpret_cast<ClockRegisters *>(getPeripheralVirtAddress(PWMCLK_BASE_OFFSET));
float pwmClkFreq = PWM_WRITES_PER_SAMPLE * PWM_CHANNEL_RANGE * sampleRate / 1000000;
pwmClk->ctl = (0x5A << 24) | 0x06;
std::this_thread::sleep_for(std::chrono::microseconds(1000));
pwmClk->div = (0x5A << 24) | static_cast<uint32_t>(getSourceFreq() * (0x01 << 12) / pwmClkFreq);
pwmClk->ctl = (0x5A << 24) | (0x01 << 4) | 0x06;
volatile PWMRegisters *pwm = reinterpret_cast<PWMRegisters *>(getPeripheralVirtAddress(PWM_BASE_OFFSET));
pwm->ctl = 0x00000000;
std::this_thread::sleep_for(std::chrono::microseconds(1000));
pwm->status = 0x01FC;
pwm->ctl = (0x01 << 6);
std::this_thread::sleep_for(std::chrono::microseconds(1000));
pwm->chn1Range = PWM_CHANNEL_RANGE;
pwm->dmaConf = (0x01 << 31) | 0x0707;
pwm->ctl = (0x01 << 5) | (0x01 << 2) | 0x01;
return pwm;
}
void Transmitter::closePwmController(volatile PWMRegisters *pwm)
{
pwm->ctl = 0x00000000;
}
volatile DMARegisters *Transmitter::startDma(AllocatedMemory &memory, volatile DMAControllBlock *dmaCb, uint8_t dmaChannel)
{
volatile DMARegisters *dma = reinterpret_cast<DMARegisters *>(getPeripheralVirtAddress((dmaChannel < 15) ? DMA0_BASE_OFFSET + dmaChannel * 0x100 : DMA15_BASE_OFFSET));
dma->ctlStatus = (0x01 << 31);
std::this_thread::sleep_for(std::chrono::microseconds(1000));
dma->ctlStatus = (0x01 << 2) | (0x01 << 1);
dma->cbAddress = getMemoryPhysAddress(memory, dmaCb);
dma->ctlStatus = (0xFF << 16) | 0x01;
return dma;
}
void Transmitter::closeDma(volatile DMARegisters *dma)
{
dma->ctlStatus = (0x01 << 31);
}
volatile ClockRegisters *Transmitter::initClockOutput()
{
volatile ClockRegisters *clock = reinterpret_cast<ClockRegisters *>(getPeripheralVirtAddress(CLK0_BASE_OFFSET));
volatile uint32_t *gpio = reinterpret_cast<uint32_t *>(getPeripheralVirtAddress(GPIO_BASE_OFFSET));
clock->ctl = (0x5A << 24) | 0x06;
std::this_thread::sleep_for(std::chrono::microseconds(1000));
clock->div = (0x5A << 24) | clockDivisor;
clock->ctl = (0x5A << 24) | (0x01 << 9) | (0x01 << 4) | 0x06;
*gpio = (*gpio & 0xFFFF8FFF) | (0x01 << 14);
return clock;
}
void Transmitter::closeClockOutput(volatile ClockRegisters *clock)
{
clock->ctl = (0x5A << 24) | 0x06;
}
void Transmitter::transmit(WaveReader &reader, float frequency, float bandwidth, uint8_t dmaChannel, bool preserveCarrierOnExit)
void Transmitter::Transmit(WaveReader &reader, float frequency, float bandwidth, unsigned dmaChannel, bool preserveCarrier)
{
if (transmitting) {
throw std::runtime_error("Cannot play, transmitter already in use");
throw std::runtime_error("Cannot transmit, transmitter already in use");
}
transmitting = true;
stopped = false;
PCMWaveHeader header = reader.getHeader();
uint32_t bufferSize = static_cast<uint32_t>(static_cast<uint64_t>(header.sampleRate) * BUFFER_TIME / 1000000);
WaveHeader header = reader.GetHeader();
unsigned bufferSize = static_cast<unsigned>(static_cast<unsigned long long>(header.sampleRate) * BUFFER_TIME / 1000000);
preserveCarrier = preserveCarrierOnExit;
clockDivisor = static_cast<uint32_t>(round(getSourceFreq() * (0x01 << 12) / frequency));
divisorRange = clockDivisor - static_cast<uint32_t>(round(getSourceFreq() * (0x01 << 12) / (frequency + 0.0005f * bandwidth)));
sampleRate = header.sampleRate;
unsigned clockDivisor = static_cast<unsigned>(round(Peripherals::GetClockFrequency() * (0x01 << 12) / frequency));
unsigned divisorRange = clockDivisor - static_cast<unsigned>(round(Peripherals::GetClockFrequency() * (0x01 << 12) / (frequency + 0.0005f * bandwidth)));
if (output == nullptr) {
output = initClockOutput();
output = new ClockOutput(clockDivisor);
}
auto finally = [&]() {
if (!preserveCarrier) {
closeClockOutput(output);
delete output;
output = nullptr;
}
transmitting = false;
};
try {
if (dmaChannel != 0xFF) {
transmitViaDma(reader, bufferSize, dmaChannel);
if (dmaChannel != 0xff) {
TransmitViaDma(reader, *output, header.sampleRate, bufferSize, clockDivisor, divisorRange, dmaChannel);
} else {
transmitViaCpu(reader, bufferSize);
TransmitViaCpu(reader, *output, header.sampleRate, bufferSize, clockDivisor, divisorRange);
}
} catch (...) {
preserveCarrier = false;
finally();
throw;
}
finally();
}
void Transmitter::transmitViaCpu(WaveReader &reader, uint32_t bufferSize)
void Transmitter::Stop()
{
samples = reader.getSamples(bufferSize, transmitting);
if (!samples.size()) {
stopped = true;
}
void Transmitter::TransmitViaCpu(WaveReader &reader, ClockOutput &output, unsigned sampleRate, unsigned bufferSize, unsigned clockDivisor, unsigned divisorRange)
{
std::vector<Sample> samples = reader.GetSamples(bufferSize, stopped);
if (samples.empty()) {
return;
}
sampleOffset = 0;
unsigned sampleOffset = 0;
bool eof = samples.size() < bufferSize;
std::thread txThread(Transmitter::transmitThread);
std::thread transmitterThread(Transmitter::TransmitterThread, this, &output, sampleRate, clockDivisor, divisorRange, &sampleOffset, &samples);
std::this_thread::sleep_for(std::chrono::microseconds(BUFFER_TIME / 2));
bool wait = false;
auto finally = [&]() {
transmitting = false;
txThread.join();
stopped = true;
transmitterThread.join();
samples.clear();
};
try {
while (!eof && transmitting) {
if (wait) {
std::this_thread::sleep_for(std::chrono::microseconds(BUFFER_TIME / 2));
}
std::lock_guard<std::mutex> locked(samplesMutex);
if (!samples.size()) {
if (!reader.setSampleOffset(sampleOffset + bufferSize)) {
break;
while (!eof && !stopped) {
{
std::lock_guard<std::mutex> lock(access);
if (samples.empty()) {
if (!reader.SetSampleOffset(sampleOffset + bufferSize)) {
break;
}
samples = reader.GetSamples(bufferSize, stopped);
if (samples.empty()) {
break;
}
eof = samples.size() < bufferSize;
}
samples = reader.getSamples(bufferSize, transmitting);
if (!samples.size()) {
break;
}
eof = samples.size() < bufferSize;
}
wait = true;
std::this_thread::sleep_for(std::chrono::microseconds(BUFFER_TIME / 2));
}
} catch (...) {
finally();
@ -355,86 +410,80 @@ void Transmitter::transmitViaCpu(WaveReader &reader, uint32_t bufferSize)
finally();
}
void Transmitter::transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_t dmaChannel)
void Transmitter::TransmitViaDma(WaveReader &reader, ClockOutput &output, unsigned sampleRate, unsigned bufferSize, unsigned clockDivisor, unsigned divisorRange, unsigned dmaChannel)
{
if (dmaChannel > 15) {
throw std::runtime_error("DMA channel number out of range (0 - 15)");
}
samples = reader.getSamples(bufferSize, transmitting);
if (!samples.size()) {
AllocatedMemory allocated(sizeof(uint32_t) * (bufferSize) + sizeof(DMAControllBlock) * (2 * bufferSize) + sizeof(uint32_t));
std::vector<Sample> samples = reader.GetSamples(bufferSize, stopped);
if (samples.empty()) {
return;
}
bool eof = false;
if (samples.size() < bufferSize) {
bufferSize = samples.size();
eof = true;
}
AllocatedMemory dmaMemory = allocateMemory(sizeof(uint32_t) * (bufferSize + 1) + sizeof(DMAControllBlock) * (2 * bufferSize));
if (!dmaMemory.size) {
throw std::runtime_error("Cannot allocate memory");
}
PWMController pwm(sampleRate);
Peripherals &peripherals = Peripherals::GetInstance();
volatile PWMRegisters *pwm = initPwmController();
unsigned i, cbOffset = 0;
uint32_t i, cbOffset = 0;
volatile DMAControllBlock *dmaCb = reinterpret_cast<DMAControllBlock *>(dmaMemory.virtualBase);
volatile DMAControllBlock *dmaCb = reinterpret_cast<DMAControllBlock *>(allocated.GetAddress());
volatile uint32_t *clkDiv = reinterpret_cast<uint32_t *>(reinterpret_cast<uint32_t>(dmaCb) + 2 * sizeof(DMAControllBlock) * bufferSize);
volatile uint32_t *pwmFifoData = reinterpret_cast<uint32_t *>(reinterpret_cast<uint32_t>(clkDiv) + sizeof(uint32_t) * bufferSize);
for (i = 0; i < bufferSize; i++) {
float value = samples[i].getMonoValue();
clkDiv[i] = (0x5A << 24) | (clockDivisor - static_cast<int32_t>(round(value * divisorRange)));
float value = samples[i].GetMonoValue();
clkDiv[i] = (0x5a << 24) | (0xffffff & (clockDivisor - static_cast<int>(round(value * divisorRange))));
dmaCb[cbOffset].transferInfo = (0x01 << 26) | (0x01 << 3);
dmaCb[cbOffset].srcAddress = getMemoryPhysAddress(dmaMemory, &clkDiv[i]);
dmaCb[cbOffset].dstAddress = getPeripheralPhysAddress(&output->div);
dmaCb[cbOffset].srcAddress = allocated.GetPhysicalAddress(&clkDiv[i]);
dmaCb[cbOffset].dstAddress = peripherals.GetPhysicalAddress(&output.GetDivisor());
dmaCb[cbOffset].transferLen = sizeof(uint32_t);
dmaCb[cbOffset].stride = 0;
dmaCb[cbOffset].nextCbAddress = getMemoryPhysAddress(dmaMemory, &dmaCb[cbOffset + 1]);
dmaCb[cbOffset].nextCbAddress = allocated.GetPhysicalAddress(&dmaCb[cbOffset + 1]);
cbOffset++;
dmaCb[cbOffset].transferInfo = (0x01 << 26) | (0x05 << 16) | (0x01 << 6) | (0x01 << 3);
dmaCb[cbOffset].srcAddress = getMemoryPhysAddress(dmaMemory, pwmFifoData);
dmaCb[cbOffset].dstAddress = getPeripheralPhysAddress(&pwm->fifoIn);
dmaCb[cbOffset].srcAddress = allocated.GetPhysicalAddress(pwmFifoData);
dmaCb[cbOffset].dstAddress = peripherals.GetPhysicalAddress(&pwm.GetFifoIn());
dmaCb[cbOffset].transferLen = sizeof(uint32_t) * PWM_WRITES_PER_SAMPLE;
dmaCb[cbOffset].stride = 0;
dmaCb[cbOffset].nextCbAddress = getMemoryPhysAddress(dmaMemory, (i < bufferSize - 1) ? &dmaCb[cbOffset + 1] : dmaCb);
dmaCb[cbOffset].nextCbAddress = allocated.GetPhysicalAddress((i < bufferSize - 1) ? &dmaCb[cbOffset + 1] : dmaCb);
cbOffset++;
}
*pwmFifoData = 0x00000000;
volatile DMARegisters *dma = startDma(dmaMemory, dmaCb, dmaChannel);
DMAController dma(allocated.GetPhysicalAddress(dmaCb), dmaChannel);
std::this_thread::sleep_for(std::chrono::microseconds(BUFFER_TIME / 4));
auto finally = [&]() {
dmaCb[(cbOffset < 2 * bufferSize) ? cbOffset : 0].nextCbAddress = 0x00000000;
while (dma->cbAddress != 0x00000000) {
while (dma.GetControllBlockAddress() != 0x00000000) {
std::this_thread::sleep_for(std::chrono::microseconds(1000));
}
closeDma(dma);
closePwmController(pwm);
freeMemory(dmaMemory);
transmitting = false;
stopped = true;
samples.clear();
};
try {
while (!eof && transmitting) {
samples = reader.getSamples(bufferSize, transmitting);
while (!eof && !stopped) {
samples = reader.GetSamples(bufferSize, stopped);
if (!samples.size()) {
break;
}
cbOffset = 0;
eof = samples.size() < bufferSize;
for (i = 0; i < samples.size(); i++) {
float value = samples[i].getMonoValue();
while (i == ((dma->cbAddress - getMemoryPhysAddress(dmaMemory, dmaCb)) / (2 * sizeof(DMAControllBlock)))) {
float value = samples[i].GetMonoValue();
while (i == ((dma.GetControllBlockAddress() - allocated.GetPhysicalAddress(dmaCb)) / (2 * sizeof(DMAControllBlock)))) {
std::this_thread::sleep_for(std::chrono::microseconds(1000));
}
clkDiv[i] = (0x5A << 24) | (clockDivisor - static_cast<int32_t>(round(value * divisorRange)));
clkDiv[i] = (0x5a << 24) | (0xffffff & (clockDivisor - static_cast<int>(round(value * divisorRange))));
cbOffset += 2;
}
}
@ -445,44 +494,42 @@ void Transmitter::transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_
finally();
}
void Transmitter::transmitThread()
void Transmitter::TransmitterThread(Transmitter *instance, ClockOutput *output, unsigned sampleRate, unsigned clockDivisor, unsigned divisorRange, unsigned *sampleOffset, std::vector<Sample> *samples)
{
volatile TimerRegisters *timer = reinterpret_cast<TimerRegisters *>(getPeripheralVirtAddress(TIMER_BASE_OFFSET));
Peripherals &peripherals = Peripherals::GetInstance();
volatile TimerRegisters *timer = reinterpret_cast<TimerRegisters *>(peripherals.GetVirtualAddress(TIMER_BASE_OFFSET));
uint64_t current = *(reinterpret_cast<volatile uint64_t *>(&timer->low));
uint64_t playbackStart = current;
while (transmitting) {
uint64_t start = current;
bool locked = samplesMutex.try_lock();
auto unlock = [&]() {
if (locked) {
samplesMutex.unlock();
while (true) {
std::vector<Sample> loadedSamples;
while (true) {
{
std::lock_guard<std::mutex> lock(instance->access);
if (instance->stopped) {
return;
}
loadedSamples = std::move(*samples);
current = *(reinterpret_cast<volatile uint64_t *>(&timer->low));
if (!loadedSamples.empty()) {
*sampleOffset = (current - playbackStart) * sampleRate / 1000000;
break;
}
}
};
while ((!locked || !samples.size()) && transmitting) {
unlock();
std::this_thread::sleep_for(std::chrono::microseconds(1));
current = *(reinterpret_cast<volatile uint64_t *>(&timer->low));
locked = samplesMutex.try_lock();
}
if (!transmitting) {
unlock();
break;
}
std::vector<Sample> loaded = std::move(samples);
unlock();
};
sampleOffset = (current - playbackStart) * sampleRate / 1000000;
uint32_t offset = (current - start) * sampleRate / 1000000;
uint64_t start = current;
unsigned offset = (current - start) * sampleRate / 1000000;
while (true) {
if (offset >= loaded.size()) {
if (offset >= loadedSamples.size()) {
break;
}
uint32_t prevOffset = offset;
float value = loaded[offset].getMonoValue();
output->div = (0x5A << 24) | (clockDivisor - static_cast<int32_t>(round(value * divisorRange)));
unsigned prevOffset = offset;
float value = loadedSamples[offset].GetMonoValue();
instance->output->SetDivisor(clockDivisor - static_cast<int>(round(value * divisorRange)));
while (offset == prevOffset) {
std::this_thread::sleep_for(std::chrono::microseconds(1)); // asm("nop");
current = *(reinterpret_cast<volatile uint64_t *>(&timer->low));;
@ -491,9 +538,3 @@ void Transmitter::transmitThread()
}
}
}
void Transmitter::stop()
{
preserveCarrier = false;
transmitting = false;
}

49
transmitter.hpp
Wyświetl plik

@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -37,50 +37,27 @@
#include "wave_reader.hpp"
#include <mutex>
struct AllocatedMemory;
struct PWMRegisters;
struct DMARegisters;
struct DMAControllBlock;
struct ClockRegisters;
class ClockOutput;
class Transmitter
{
public:
~Transmitter();
Transmitter();
virtual ~Transmitter();
Transmitter(const Transmitter &) = delete;
Transmitter(Transmitter &&) = delete;
Transmitter &operator=(const Transmitter &) = delete;
static Transmitter &getInstance();
void transmit(WaveReader &reader, float frequency, float bandwidth, uint8_t dmaChannel, bool preserveCarrierOnExit);
void stop();
void Transmit(WaveReader &reader, float frequency, float bandwidth, unsigned dmaChannel, bool preserveCarrier);
void Stop();
private:
Transmitter();
uint32_t getPeripheralsVirtBaseAddress() const;
uint32_t getPeripheralsSize() const;
float getSourceFreq() const;
uint32_t getPeripheralPhysAddress(volatile void *object) const;
static uint32_t getPeripheralVirtAddress(uint32_t offset);
uint32_t getMemoryPhysAddress(AllocatedMemory &memory, volatile void *object) const;
AllocatedMemory allocateMemory(uint32_t size);
void freeMemory(AllocatedMemory &memory);
volatile PWMRegisters *initPwmController();
void closePwmController(volatile PWMRegisters *pwm);
volatile DMARegisters *startDma(AllocatedMemory &memory, volatile DMAControllBlock *dmaCb, uint8_t dmaChannel);
void closeDma(volatile DMARegisters *dma);
volatile ClockRegisters *initClockOutput();
void closeClockOutput(volatile ClockRegisters *clock);
void transmitViaCpu(WaveReader &reader, uint32_t bufferSize);
void transmitViaDma(WaveReader &reader, uint32_t bufferSize, uint8_t dmaChannel);
static void transmitThread();
void TransmitViaCpu(WaveReader &reader, ClockOutput &output, unsigned sampleRate, unsigned bufferSize, unsigned clockDivisor, unsigned divisorRange);
void TransmitViaDma(WaveReader &reader, ClockOutput &output, unsigned sampleRate, unsigned bufferSize, unsigned clockDivisor, unsigned divisorRange, unsigned dmaChannel);
static void TransmitterThread(Transmitter *instance, ClockOutput *output, unsigned sampleRate, unsigned clockDivisor, unsigned divisorRange, unsigned *sampleOffset, std::vector<Sample> *samples);
bool preserveCarrier;
static void *peripherals;
static bool transmitting;
static uint32_t sampleOffset, clockDivisor, divisorRange, sampleRate;
static volatile ClockRegisters *output;
static std::vector<Sample> samples;
static std::mutex samplesMutex;
ClockOutput *output;
std::mutex access;
bool stopped;
};
#endif // TRANSMITTER_HPP

127
wave_reader.cpp
Wyświetl plik

@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -39,7 +39,7 @@
#include <unistd.h>
#include <fcntl.h>
WaveReader::WaveReader(const std::string &filename, bool &continueFlag) :
WaveReader::WaveReader(const std::string &filename, bool &stop) :
filename(filename), headerOffset(0), currentDataOffset(0)
{
if (!filename.empty()) {
@ -50,34 +50,34 @@ WaveReader::WaveReader(const std::string &filename, bool &continueFlag) :
}
if (fileDescriptor == -1) {
throw std::runtime_error(std::string("Cannot open ") + getFilename() + std::string(", file does not exist"));
throw std::runtime_error(std::string("Cannot open ") + GetFilename() + std::string(", file does not exist"));
}
try {
readData(sizeof(PCMWaveHeader::chunkID) + sizeof(PCMWaveHeader::chunkSize) + sizeof(PCMWaveHeader::format), true, continueFlag);
ReadData(sizeof(WaveHeader::chunkID) + sizeof(WaveHeader::chunkSize) + sizeof(WaveHeader::format), true, stop);
if ((std::string(reinterpret_cast<char *>(header.chunkID), 4) != std::string("RIFF")) || (std::string(reinterpret_cast<char *>(header.format), 4) != std::string("WAVE"))) {
throw std::runtime_error(std::string("Error while opening ") + getFilename() + std::string(", WAVE file expected"));
throw std::runtime_error(std::string("Error while opening ") + GetFilename() + std::string(", WAVE file expected"));
}
readData(sizeof(PCMWaveHeader::subchunk1ID) + sizeof(PCMWaveHeader::subchunk1Size), true, continueFlag);
uint32_t subchunk1MinSize = sizeof(PCMWaveHeader::audioFormat) + sizeof(PCMWaveHeader::channels) +
sizeof(PCMWaveHeader::sampleRate) + sizeof(PCMWaveHeader::byteRate) + sizeof(PCMWaveHeader::blockAlign) +
sizeof(PCMWaveHeader::bitsPerSample);
ReadData(sizeof(WaveHeader::subchunk1ID) + sizeof(WaveHeader::subchunk1Size), true, stop);
unsigned subchunk1MinSize = sizeof(WaveHeader::audioFormat) + sizeof(WaveHeader::channels) +
sizeof(WaveHeader::sampleRate) + sizeof(WaveHeader::byteRate) + sizeof(WaveHeader::blockAlign) +
sizeof(WaveHeader::bitsPerSample);
if ((std::string(reinterpret_cast<char *>(header.subchunk1ID), 4) != std::string("fmt ")) || (header.subchunk1Size < subchunk1MinSize)) {
throw std::runtime_error(std::string("Error while opening ") + getFilename() + std::string(", data corrupted"));
throw std::runtime_error(std::string("Error while opening ") + GetFilename() + std::string(", data corrupted"));
}
readData(header.subchunk1Size, true, continueFlag);
ReadData(header.subchunk1Size, true, stop);
if ((header.audioFormat != WAVE_FORMAT_PCM) ||
(header.byteRate != (header.bitsPerSample >> 3) * header.channels * header.sampleRate) ||
(header.blockAlign != (header.bitsPerSample >> 3) * header.channels) ||
(((header.bitsPerSample >> 3) != 1) && ((header.bitsPerSample >> 3) != 2))) {
throw std::runtime_error(std::string("Error while opening ") + getFilename() + std::string(", unsupported WAVE format"));
throw std::runtime_error(std::string("Error while opening ") + GetFilename() + std::string(", unsupported WAVE format"));
}
readData(sizeof(PCMWaveHeader::subchunk2ID) + sizeof(PCMWaveHeader::subchunk2Size), true, continueFlag);
ReadData(sizeof(WaveHeader::subchunk2ID) + sizeof(WaveHeader::subchunk2Size), true, stop);
if (std::string(reinterpret_cast<char *>(header.subchunk2ID), 4) != std::string("data")) {
throw std::runtime_error(std::string("Error while opening ") + getFilename() + std::string(", data corrupted"));
throw std::runtime_error(std::string("Error while opening ") + GetFilename() + std::string(", data corrupted"));
}
} catch (...) {
if (fileDescriptor != STDIN_FILENO) {
@ -98,65 +98,38 @@ WaveReader::~WaveReader()
}
}
std::vector<uint8_t> WaveReader::readData(uint32_t bytesToRead, bool headerBytes, bool &continueFlag)
std::string WaveReader::GetFilename() const
{
uint32_t bytesRead = 0;
std::vector<uint8_t> data;
data.resize(bytesToRead);
while ((bytesRead < bytesToRead) && continueFlag) {
int bytes = read(fileDescriptor, &data[bytesRead], bytesToRead - bytesRead);
if (((bytes == -1) && ((fileDescriptor != STDIN_FILENO) || (errno != EAGAIN))) ||
((static_cast<uint32_t>(bytes) < bytesToRead) && headerBytes && (fileDescriptor != STDIN_FILENO))) {
throw std::runtime_error(std::string("Error while opening ") + getFilename() + std::string(", data corrupted"));
}
if (bytes > 0) {
bytesRead += bytes;
}
if (bytesRead < bytesToRead) {
if (fileDescriptor != STDIN_FILENO) {
data.resize(bytes);
break;
} else {
std::this_thread::sleep_for(std::chrono::microseconds(1));
}
}
}
if (headerBytes) {
if (!continueFlag) {
throw std::runtime_error("Cannot obtain header, program interrupted");
}
std::memcpy(&(reinterpret_cast<uint8_t *>(&header))[headerOffset], data.data(), bytesRead);
headerOffset += bytesRead;
} else {
currentDataOffset += bytesRead;
}
return data;
return fileDescriptor != STDIN_FILENO ? filename : "STDIN";
}
std::vector<Sample> WaveReader::getSamples(uint32_t quantity, bool &continueFlag) {
uint32_t bytesPerSample = (header.bitsPerSample >> 3) * header.channels;
uint32_t bytesToRead = quantity * bytesPerSample;
uint32_t bytesLeft = header.subchunk2Size - currentDataOffset;
const WaveHeader &WaveReader::GetHeader() const
{
return header;
}
std::vector<Sample> WaveReader::GetSamples(unsigned quantity, bool &stop) {
unsigned bytesPerSample = (header.bitsPerSample >> 3) * header.channels;
unsigned bytesToRead = quantity * bytesPerSample;
unsigned bytesLeft = header.subchunk2Size - currentDataOffset;
if (bytesToRead > bytesLeft) {
bytesToRead = bytesLeft - bytesLeft % bytesPerSample;
quantity = bytesToRead / bytesPerSample;
}
std::vector<uint8_t> data = std::move(readData(bytesToRead, false, continueFlag));
std::vector<uint8_t> data = std::move(ReadData(bytesToRead, false, stop));
if (data.size() < bytesToRead) {
quantity = data.size() / bytesPerSample;
}
std::vector<Sample> samples;
for (uint32_t i = 0; i < quantity; i++) {
for (unsigned i = 0; i < quantity; i++) {
samples.push_back(Sample(&data[bytesPerSample * i], header.channels, header.bitsPerSample));
}
return samples;
}
bool WaveReader::setSampleOffset(uint32_t offset) {
bool WaveReader::SetSampleOffset(unsigned offset) {
if (fileDescriptor != STDIN_FILENO) {
currentDataOffset = offset * (header.bitsPerSample >> 3) * header.channels;
if (lseek(fileDescriptor, dataOffset + currentDataOffset, SEEK_SET) == -1) {
@ -166,12 +139,42 @@ bool WaveReader::setSampleOffset(uint32_t offset) {
return true;
}
std::string WaveReader::getFilename() const
std::vector<uint8_t> WaveReader::ReadData(unsigned bytesToRead, bool headerBytes, bool &stop)
{
return fileDescriptor != STDIN_FILENO ? filename : "STDIN";
}
unsigned bytesRead = 0;
std::vector<uint8_t> data;
data.resize(bytesToRead);
while ((bytesRead < bytesToRead) && !stop) {
int bytes = read(fileDescriptor, &data[bytesRead], bytesToRead - bytesRead);
if (((bytes == -1) && ((fileDescriptor != STDIN_FILENO) || (errno != EAGAIN))) ||
((static_cast<unsigned>(bytes) < bytesToRead) && headerBytes && (fileDescriptor != STDIN_FILENO))) {
throw std::runtime_error(std::string("Error while opening ") + GetFilename() + std::string(", data corrupted"));
}
if (bytes > 0) {
bytesRead += bytes;
}
if (bytesRead < bytesToRead) {
if (fileDescriptor != STDIN_FILENO) {
data.resize(bytesRead);
break;
} else {
std::this_thread::sleep_for(std::chrono::microseconds(1));
}
}
}
PCMWaveHeader WaveReader::getHeader() const
{
return header;
if (headerBytes) {
if (stop) {
throw std::runtime_error("Cannot obtain header, program interrupted");
}
std::memcpy(&(reinterpret_cast<uint8_t *>(&header))[headerOffset], data.data(), bytesRead);
headerOffset += bytesRead;
} else {
if (stop) {
data.resize(bytesRead);
}
currentDataOffset += bytesRead;
}
return data;
}

40
wave_reader.hpp
Wyświetl plik

@ -1,7 +1,7 @@
/*
fm_transmitter - use Raspberry Pi as FM transmitter
FM Transmitter - use Raspberry Pi as FM transmitter
Copyright (c) 2019, Marcin Kondej
Copyright (c) 2020, Marcin Kondej
All rights reserved.
See https://github.com/markondej/fm_transmitter
@ -34,29 +34,47 @@
#ifndef WAVE_READER_HPP
#define WAVE_READER_HPP
#include "pcm_wave_header.hpp"
#include "sample.hpp"
#include <string>
#include <vector>
#define WAVE_FORMAT_PCM 0x0001
struct WaveHeader
{
uint8_t chunkID[4];
uint32_t chunkSize;
uint8_t format[4];
uint8_t subchunk1ID[4];
uint32_t subchunk1Size;
uint16_t audioFormat;
uint16_t channels;
uint32_t sampleRate;
uint32_t byteRate;
uint16_t blockAlign;
uint16_t bitsPerSample;
uint8_t subchunk2ID[4];
uint32_t subchunk2Size;
};
class WaveReader
{
public:
WaveReader(const std::string &filename, bool &continueFlag);
WaveReader(const std::string &filename, bool &stop);
virtual ~WaveReader();
WaveReader(const WaveReader &) = delete;
WaveReader(WaveReader &&) = delete;
WaveReader &operator=(const WaveReader &) = delete;
std::string getFilename() const;
PCMWaveHeader getHeader() const;
std::vector<Sample> getSamples(uint32_t quantity, bool &continueFlag);
bool setSampleOffset(uint32_t offset);
std::string GetFilename() const;
const WaveHeader &GetHeader() const;
std::vector<Sample> GetSamples(unsigned quantity, bool &stop);
bool SetSampleOffset(unsigned offset);
private:
std::vector<uint8_t> readData(uint32_t bytesToRead, bool headerBytes, bool &continueFlag);
std::vector<uint8_t> ReadData(unsigned bytesToRead, bool headerBytes, bool &stop);
std::string filename;
PCMWaveHeader header;
uint32_t dataOffset, headerOffset, currentDataOffset;
WaveHeader header;
unsigned dataOffset, headerOffset, currentDataOffset;
int fileDescriptor;
};