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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "i2s_audio_output.hpp"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <variant>
#include "esp_err.h"
#include "esp_heap_caps.h"
#include "freertos/portmacro.h"
#include "freertos/projdefs.h"
#include "audio_sink.hpp"
#include "gpios.hpp"
#include "i2c.hpp"
#include "i2s_dac.hpp"
#include "result.hpp"
#include "wm8523.hpp"
static const char* kTag = "I2SOUT";
namespace audio {
// Consumer line level = 0.316 VRMS = -10db = 61
// Professional line level = 1.228 VRMS = +4dB = 111
// Cliipping level = 2.44 VRMS = 133?
// all into 650 ohms
static constexpr uint16_t kMaxVolume = 0x1ff;
static constexpr uint16_t kMinVolume = 0b0;
static constexpr uint16_t kMaxVolumeBeforeClipping = 0x185;
static constexpr uint16_t kLineLevelVolume = 0x13d;
static constexpr uint16_t kDefaultVolume = 0x100;
static constexpr size_t kDrainBufferSize = 8 * 1024;
I2SAudioOutput::I2SAudioOutput(drivers::IGpios& expander,
std::unique_ptr<drivers::I2SDac> dac)
: IAudioOutput(kDrainBufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT),
expander_(expander),
dac_(std::move(dac)),
current_config_(),
left_difference_(0),
current_volume_(kDefaultVolume),
max_volume_(kLineLevelVolume) {
SetVolume(GetVolume());
dac_->SetSource(stream());
}
I2SAudioOutput::~I2SAudioOutput() {
dac_->Stop();
dac_->SetSource(nullptr);
}
auto I2SAudioOutput::SetInUse(bool in_use) -> void {
if (in_use) {
dac_->Start();
} else {
dac_->Stop();
}
}
auto I2SAudioOutput::SetVolumeImbalance(int_fast8_t balance) -> void {
left_difference_ = balance;
SetVolume(GetVolume());
}
auto I2SAudioOutput::SetVolume(uint_fast8_t percent) -> void {
percent = std::min<uint_fast8_t>(percent, 100);
float new_value = static_cast<float>(max_volume_) / 100 * percent;
current_volume_ = std::max<float>(new_value, kMinVolume);
ESP_LOGI(kTag, "set volume to %u%% = %u", percent, current_volume_);
int32_t left_unclamped = current_volume_ + left_difference_;
uint16_t left = std::clamp<int32_t>(left_unclamped, kMinVolume, max_volume_);
using drivers::wm8523::Register;
drivers::wm8523::WriteRegister(Register::kDacGainLeft, left);
drivers::wm8523::WriteRegister(Register::kDacGainRight,
current_volume_ | 0x200);
}
auto I2SAudioOutput::GetVolume() -> uint_fast8_t {
return static_cast<uint_fast8_t>(static_cast<float>(current_volume_) /
max_volume_ * 100.0f);
}
auto I2SAudioOutput::AdjustVolumeUp() -> bool {
if (GetVolume() >= 100) {
return false;
}
if (GetVolume() >= 95) {
SetVolume(100);
} else {
SetVolume(GetVolume() + 5);
}
return true;
}
auto I2SAudioOutput::AdjustVolumeDown() -> bool {
if (GetVolume() == 0) {
return false;
}
if (GetVolume() <= 5) {
SetVolume(0);
} else {
SetVolume(GetVolume() - 5);
}
return true;
}
auto I2SAudioOutput::PrepareFormat(const Format& orig) -> Format {
return Format{
.sample_rate = std::clamp<uint32_t>(orig.sample_rate, 8000, 96000),
.num_channels = std::min<uint8_t>(orig.num_channels, 2),
.bits_per_sample = std::clamp<uint8_t>(orig.bits_per_sample, 16, 32),
};
}
auto I2SAudioOutput::Configure(const Format& fmt) -> void {
if (current_config_ && fmt == *current_config_) {
ESP_LOGI(kTag, "ignoring unchanged format");
return;
}
ESP_LOGI(kTag, "incoming audio stream: %u ch %u bpp @ %lu Hz",
fmt.num_channels, fmt.bits_per_sample, fmt.sample_rate);
drivers::I2SDac::Channels ch;
switch (fmt.num_channels) {
case 1:
ch = drivers::I2SDac::CHANNELS_MONO;
break;
case 2:
ch = drivers::I2SDac::CHANNELS_STEREO;
break;
default:
ESP_LOGE(kTag, "dropping stream with out of bounds channels");
return;
}
drivers::I2SDac::BitsPerSample bps;
switch (fmt.bits_per_sample) {
case 16:
bps = drivers::I2SDac::BPS_16;
break;
case 24:
bps = drivers::I2SDac::BPS_24;
break;
case 32:
bps = drivers::I2SDac::BPS_32;
break;
default:
ESP_LOGE(kTag, "dropping stream with unknown bps");
return;
}
drivers::I2SDac::SampleRate sample_rate;
switch (fmt.sample_rate) {
case 8000:
sample_rate = drivers::I2SDac::SAMPLE_RATE_8;
break;
case 32000:
sample_rate = drivers::I2SDac::SAMPLE_RATE_32;
break;
case 44100:
sample_rate = drivers::I2SDac::SAMPLE_RATE_44_1;
break;
case 48000:
sample_rate = drivers::I2SDac::SAMPLE_RATE_48;
break;
case 88200:
sample_rate = drivers::I2SDac::SAMPLE_RATE_88_2;
break;
case 96000:
sample_rate = drivers::I2SDac::SAMPLE_RATE_96;
break;
default:
ESP_LOGE(kTag, "dropping stream with unknown rate");
return;
}
dac_->Reconfigure(ch, bps, sample_rate);
current_config_ = fmt;
}
} // namespace audio
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