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Code Issues Releases Wiki Activity

SPDIF Speaker support

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This commit is contained in:
John Boiles 2025-01-11 03:02:38 -08:00
parent 739edce268
commit 9431848bea
7 changed files with 884 additions and 0 deletions
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2
CODEOWNERS
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@ -382,6 +382,8 @@ esphome/components/smt100/* @piechade
esphome/components/sn74hc165/* @jesserockz esphome/components/sn74hc165/* @jesserockz
esphome/components/socket/* @esphome/core esphome/components/socket/* @esphome/core
esphome/components/sonoff_d1/* @anatoly-savchenkov esphome/components/sonoff_d1/* @anatoly-savchenkov
esphome/components/spdif_audio/* @johnboiles
esphome/components/spdif_audio/speaker/* @johnboiles
esphome/components/speaker/* @jesserockz @kahrendt esphome/components/speaker/* @jesserockz @kahrendt
esphome/components/spi/* @clydebarrow @esphome/core esphome/components/spi/* @clydebarrow @esphome/core
esphome/components/spi_device/* @clydebarrow esphome/components/spi_device/* @clydebarrow

7
esphome/components/spdif_audio/__init__.py Normal file
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import esphome.codegen as cg
CODEOWNERS = ["@johnboiles"]
DEPENDENCIES = ["esp32"]
MULTI_CONF = True
spdif_audio_ns = cg.esphome_ns.namespace("spdif_audio")

61
esphome/components/spdif_audio/speaker/__init__.py Normal file
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from esphome import pins
import esphome.codegen as cg
from esphome.components import speaker
from esphome.components.i2s_audio import I2SAudioComponent
import esphome.config_validation as cv
from esphome.const import (
CONF_DATA_PIN,
CONF_DEBUG,
CONF_ID,
CONF_SAMPLE_RATE,
CONF_TIMEOUT,
)
from .. import spdif_audio_ns
DEPENDENCIES = ["i2s_audio"]
CODEOWNERS = ["@johnboiles"]
SPDIFSpeaker = spdif_audio_ns.class_(
"SPDIFSpeaker", cg.Component, speaker.Speaker, I2SAudioComponent
)
CONF_BUFFER_DURATION = "buffer_duration"
CONF_NEVER = "never"
CONF_I2S_AUDIO_ID = "i2s_audio_id"
CONF_FILL_SILENCE = "fill_silence"
CONFIG_SCHEMA = speaker.SPEAKER_SCHEMA.extend(
{
cv.GenerateID(): cv.declare_id(SPDIFSpeaker),
cv.GenerateID(CONF_I2S_AUDIO_ID): cv.use_id(I2SAudioComponent),
cv.Required(CONF_DATA_PIN): pins.internal_gpio_output_pin_number,
cv.Optional(CONF_SAMPLE_RATE, default=48000): cv.positive_int,
cv.Optional(
CONF_BUFFER_DURATION, default="500ms"
): cv.positive_time_period_milliseconds,
cv.Optional(CONF_TIMEOUT, default="500ms"): cv.Any(
cv.positive_time_period_milliseconds,
cv.one_of(CONF_NEVER, lower=True),
),
cv.Optional(CONF_FILL_SILENCE, default=True): cv.boolean,
cv.Optional(CONF_DEBUG, default=False): cv.boolean,
}
).extend(cv.COMPONENT_SCHEMA)
async def to_code(config):
var = cg.new_Pvariable(config[CONF_ID])
await cg.register_component(var, config)
await cg.register_parented(var, config[CONF_I2S_AUDIO_ID])
await speaker.register_speaker(var, config)
cg.add(var.set_data_pin(config[CONF_DATA_PIN]))
cg.add(var.set_sample_rate(config[CONF_SAMPLE_RATE]))
cg.add(var.set_buffer_duration(config[CONF_BUFFER_DURATION]))
if config[CONF_TIMEOUT] != CONF_NEVER:
cg.add(var.set_timeout(config[CONF_TIMEOUT]))
cg.add_define("SPDIF_FILL_SILENCE", config[CONF_FILL_SILENCE])
cg.add_define("SPDIF_DEBUG", config[CONF_DEBUG])

90
esphome/components/spdif_audio/speaker/spdif.cpp Normal file
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#include "spdif.h"
#include "esphome/core/defines.h"
#include "esphome/core/log.h"
#include <esp_timer.h>
namespace esphome {
namespace spdif_audio {
static const char *const TAG = "spdif";
/*
* 8bit PCM to 16bit BMC conversion table, LSb first, 1 end
*/
static const uint16_t BMC_TABLE[256] = {
0x3333, 0xb333, 0xd333, 0x5333, 0xcb33, 0x4b33, 0x2b33, 0xab33, 0xcd33, 0x4d33, 0x2d33, 0xad33, 0x3533, 0xb533,
0xd533, 0x5533, 0xccb3, 0x4cb3, 0x2cb3, 0xacb3, 0x34b3, 0xb4b3, 0xd4b3, 0x54b3, 0x32b3, 0xb2b3, 0xd2b3, 0x52b3,
0xcab3, 0x4ab3, 0x2ab3, 0xaab3, 0xccd3, 0x4cd3, 0x2cd3, 0xacd3, 0x34d3, 0xb4d3, 0xd4d3, 0x54d3, 0x32d3, 0xb2d3,
0xd2d3, 0x52d3, 0xcad3, 0x4ad3, 0x2ad3, 0xaad3, 0x3353, 0xb353, 0xd353, 0x5353, 0xcb53, 0x4b53, 0x2b53, 0xab53,
0xcd53, 0x4d53, 0x2d53, 0xad53, 0x3553, 0xb553, 0xd553, 0x5553, 0xcccb, 0x4ccb, 0x2ccb, 0xaccb, 0x34cb, 0xb4cb,
0xd4cb, 0x54cb, 0x32cb, 0xb2cb, 0xd2cb, 0x52cb, 0xcacb, 0x4acb, 0x2acb, 0xaacb, 0x334b, 0xb34b, 0xd34b, 0x534b,
0xcb4b, 0x4b4b, 0x2b4b, 0xab4b, 0xcd4b, 0x4d4b, 0x2d4b, 0xad4b, 0x354b, 0xb54b, 0xd54b, 0x554b, 0x332b, 0xb32b,
0xd32b, 0x532b, 0xcb2b, 0x4b2b, 0x2b2b, 0xab2b, 0xcd2b, 0x4d2b, 0x2d2b, 0xad2b, 0x352b, 0xb52b, 0xd52b, 0x552b,
0xccab, 0x4cab, 0x2cab, 0xacab, 0x34ab, 0xb4ab, 0xd4ab, 0x54ab, 0x32ab, 0xb2ab, 0xd2ab, 0x52ab, 0xcaab, 0x4aab,
0x2aab, 0xaaab, 0xcccd, 0x4ccd, 0x2ccd, 0xaccd, 0x34cd, 0xb4cd, 0xd4cd, 0x54cd, 0x32cd, 0xb2cd, 0xd2cd, 0x52cd,
0xcacd, 0x4acd, 0x2acd, 0xaacd, 0x334d, 0xb34d, 0xd34d, 0x534d, 0xcb4d, 0x4b4d, 0x2b4d, 0xab4d, 0xcd4d, 0x4d4d,
0x2d4d, 0xad4d, 0x354d, 0xb54d, 0xd54d, 0x554d, 0x332d, 0xb32d, 0xd32d, 0x532d, 0xcb2d, 0x4b2d, 0x2b2d, 0xab2d,
0xcd2d, 0x4d2d, 0x2d2d, 0xad2d, 0x352d, 0xb52d, 0xd52d, 0x552d, 0xccad, 0x4cad, 0x2cad, 0xacad, 0x34ad, 0xb4ad,
0xd4ad, 0x54ad, 0x32ad, 0xb2ad, 0xd2ad, 0x52ad, 0xcaad, 0x4aad, 0x2aad, 0xaaad, 0x3335, 0xb335, 0xd335, 0x5335,
0xcb35, 0x4b35, 0x2b35, 0xab35, 0xcd35, 0x4d35, 0x2d35, 0xad35, 0x3535, 0xb535, 0xd535, 0x5535, 0xccb5, 0x4cb5,
0x2cb5, 0xacb5, 0x34b5, 0xb4b5, 0xd4b5, 0x54b5, 0x32b5, 0xb2b5, 0xd2b5, 0x52b5, 0xcab5, 0x4ab5, 0x2ab5, 0xaab5,
0xccd5, 0x4cd5, 0x2cd5, 0xacd5, 0x34d5, 0xb4d5, 0xd4d5, 0x54d5, 0x32d5, 0xb2d5, 0xd2d5, 0x52d5, 0xcad5, 0x4ad5,
0x2ad5, 0xaad5, 0x3355, 0xb355, 0xd355, 0x5355, 0xcb55, 0x4b55, 0x2b55, 0xab55, 0xcd55, 0x4d55, 0x2d55, 0xad55,
0x3555, 0xb555, 0xd555, 0x5555,
};
// BMC preamble
static const uint32_t BMC_B = 0x33173333; // block start
static const uint32_t BMC_M = 0x331d3333; // left ch
static const uint32_t BMC_W = 0x331b3333; // right ch
static const uint32_t BMC_MW_DIF = (BMC_M ^ BMC_W);
static const uint8_t SYNC_OFFSET = 2; // byte offset of SYNC
static const uint32_t SYNC_FLIP = ((BMC_B ^ BMC_M) >> (SYNC_OFFSET * 8));
// initialize S/PDIF buffer
void SPDIF::setup() {
ESP_LOGCONFIG(TAG, "Setting up SPDIF...");
int i;
uint32_t bmc_mw = BMC_W;
for (i = 0; i < SPDIF_BLOCK_SIZE_U32; i += 2) {
spdif_block_buf_[i] = bmc_mw ^= BMC_MW_DIF;
}
ESP_LOGD(TAG, "SPDIF buffer initialized to %zu bytes", sizeof(spdif_block_buf_));
spdif_block_ptr_ = spdif_block_buf_;
}
esp_err_t SPDIF::write(const uint8_t *src, size_t size, TickType_t ticks_to_wait) {
const uint8_t *p = reinterpret_cast<const uint8_t *>(src);
while (p < (uint8_t *) src + size) {
// convert PCM 16bit data to BMC 32bit pulse pattern (which is 64 i2s bits to emulate BMC)
// We cast to int16_t to avoid sign extension issues when XOR-ing
*(spdif_block_ptr_ + 1) =
(uint32_t) (((static_cast<int16_t>(BMC_TABLE[*p]) << 16) ^ static_cast<int16_t>(BMC_TABLE[*(p + 1)])) << 1) >>
1;
p += 2;
spdif_block_ptr_ += 2; // advance to next audio data
if (spdif_block_ptr_ >= &spdif_block_buf_[SPDIF_BLOCK_SIZE_U32]) {
// set block start preamble
((uint8_t *) spdif_block_buf_)[SYNC_OFFSET] ^= SYNC_FLIP;
esp_err_t err = block_complete_callback_(spdif_block_buf_, sizeof(spdif_block_buf_), ticks_to_wait);
if (err != ESP_OK) {
return err;
}
spdif_block_ptr_ = spdif_block_buf_;
}
}
return ESP_OK;
}
} // namespace spdif_audio
} // namespace esphome

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esphome/components/spdif_audio/speaker/spdif.h Normal file
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#pragma once
#include <cstdint>
#include <functional>
#include <freertos/FreeRTOS.h>
// Number of samples in a SPDIF block
static const uint16_t SPDIF_BLOCK_SAMPLES = 192;
// A SPDIF sample is 64-bit
static const uint8_t SPDIF_BITS_PER_SAMPLE = 64;
// To emulate bi-phase mark code (BMC) (aka differential Manchester encoding) we are send
// twice as many bits per sample so that we can generate the transitions this encoding requires.
static const uint8_t EMULATED_BMC_BITS_PER_SAMPLE = SPDIF_BITS_PER_SAMPLE * 2;
#define SPDIF_BLOCK_SIZE_BYTES (SPDIF_BLOCK_SAMPLES * (EMULATED_BMC_BITS_PER_SAMPLE / 8))
#define SPDIF_BLOCK_SIZE_U32 (SPDIF_BLOCK_SIZE_BYTES / sizeof(uint32_t)) // One block, 1536 bytes
namespace esphome {
namespace spdif_audio {
class SPDIF {
public:
/// @brief Initialize the BMC lookup table and working buffer
void setup();
/// @brief Function to call when a block of data is complete (called from write)
void set_block_complete_callback(
std::function<esp_err_t(uint32_t *data, size_t size, TickType_t ticks_to_wait)> callback) {
block_complete_callback_ = std::move(callback);
}
/// @brief Convert PCM audio data to SPDIF BMC encoded data
/// @param src Source PCM audio data
/// @param size Size of source data in bytes
/// @return esp_err_t as returned from block_complete_callback_
esp_err_t write(const uint8_t *src, size_t size, TickType_t ticks_to_wait);
/// @brief Reset the SPDIF block buffer
void reset() { spdif_block_ptr_ = spdif_block_buf_; }
protected:
// BMC lookup table for converting 8-bits to 16-bit emulated BMC waveform
static const uint16_t BMC_LOOKUP_TABLE[256];
std::function<esp_err_t(uint32_t *data, size_t size, TickType_t ticks_to_wait)> block_complete_callback_;
// Working buffer that holds an entire SPDIF block ready for I2S output
uint32_t spdif_block_buf_[SPDIF_BLOCK_SIZE_U32];
uint32_t *spdif_block_ptr_{nullptr};
};
} // namespace spdif_audio
} // namespace esphome

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esphome/components/spdif_audio/speaker/spdif_speaker.cpp Normal file
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#include "spdif_speaker.h"
#ifdef USE_ESP32
#include <driver/i2s.h>
#include <esp_timer.h>
#include "esphome/components/audio/audio.h"
#include "esphome/core/application.h"
#include "esphome/core/hal.h"
#include "esphome/core/log.h"
namespace esphome {
namespace spdif_audio {
static const size_t DMA_BUFFERS_COUNT = 4;
static const size_t TASK_STACK_SIZE = 4096;
static const ssize_t TASK_PRIORITY = 23;
static const size_t I2S_EVENT_QUEUE_COUNT = DMA_BUFFERS_COUNT + 1;
static const char *const TAG = "spdif_audio.speaker";
#if SPDIF_FILL_SILENCE
// A full BMC block's worth of 16-big stereo samples
int16_t silence[SPDIF_BLOCK_SAMPLES * 2];
#endif
enum SpeakerEventGroupBits : uint32_t {
COMMAND_START = (1 << 0), // starts the speaker task
COMMAND_STOP = (1 << 1), // stops the speaker task
COMMAND_STOP_GRACEFULLY = (1 << 2), // Stops the speaker task once all data has been written
STATE_STARTING = (1 << 10),
STATE_RUNNING = (1 << 11),
STATE_STOPPING = (1 << 12),
STATE_STOPPED = (1 << 13),
ERR_TASK_FAILED_TO_START = (1 << 14),
ERR_ESP_INVALID_STATE = (1 << 15),
ERR_ESP_NOT_SUPPORTED = (1 << 16),
ERR_ESP_INVALID_ARG = (1 << 17),
ERR_ESP_INVALID_SIZE = (1 << 18),
ERR_ESP_NO_MEM = (1 << 19),
ERR_ESP_FAIL = (1 << 20),
ALL_ERR_ESP_BITS = ERR_ESP_INVALID_STATE | ERR_ESP_NOT_SUPPORTED | ERR_ESP_INVALID_ARG | ERR_ESP_INVALID_SIZE |
ERR_ESP_NO_MEM | ERR_ESP_FAIL,
ALL_BITS = 0x00FFFFFF, // All valid FreeRTOS event group bits
};
// Translates a SpeakerEventGroupBits ERR_ESP bit to the coressponding esp_err_t
static esp_err_t err_bit_to_esp_err(uint32_t bit) {
switch (bit) {
case SpeakerEventGroupBits::ERR_ESP_INVALID_STATE:
return ESP_ERR_INVALID_STATE;
case SpeakerEventGroupBits::ERR_ESP_INVALID_ARG:
return ESP_ERR_INVALID_ARG;
case SpeakerEventGroupBits::ERR_ESP_INVALID_SIZE:
return ESP_ERR_INVALID_SIZE;
case SpeakerEventGroupBits::ERR_ESP_NO_MEM:
return ESP_ERR_NO_MEM;
case SpeakerEventGroupBits::ERR_ESP_NOT_SUPPORTED:
return ESP_ERR_NOT_SUPPORTED;
default:
return ESP_FAIL;
}
}
/// @brief Multiplies the input array of Q15 numbers by a Q15 constant factor
///
/// Based on `dsps_mulc_s16_ansi` from the esp-dsp library:
/// https://github.com/espressif/esp-dsp/blob/master/modules/math/mulc/fixed/dsps_mulc_s16_ansi.c
/// (accessed on 2024-09-30).
/// @param input Array of Q15 numbers
/// @param output Array of Q15 numbers
/// @param len Length of array
/// @param c Q15 constant factor
static void q15_multiplication(const int16_t *input, int16_t *output, size_t len, int16_t c) {
for (int i = 0; i < len; i++) {
int32_t acc = (int32_t) input[i] * (int32_t) c;
output[i] = (int16_t) (acc >> 15);
}
}
// Lists the Q15 fixed point scaling factor for volume reduction.
// Has 100 values representing silence and a reduction [49, 48.5, ... 0.5, 0] dB.
// dB to PCM scaling factor formula: floating_point_scale_factor = 2^(-db/6.014)
// float to Q15 fixed point formula: q15_scale_factor = floating_point_scale_factor * 2^(15)
static const std::vector<int16_t> Q15_VOLUME_SCALING_FACTORS = {
0, 116, 122, 130, 137, 146, 154, 163, 173, 183, 194, 206, 218, 231, 244,
259, 274, 291, 308, 326, 345, 366, 388, 411, 435, 461, 488, 517, 548, 580,
615, 651, 690, 731, 774, 820, 868, 920, 974, 1032, 1094, 1158, 1227, 1300, 1377,
1459, 1545, 1637, 1734, 1837, 1946, 2061, 2184, 2313, 2450, 2596, 2750, 2913, 3085, 3269,
3462, 3668, 3885, 4116, 4360, 4619, 4893, 5183, 5490, 5816, 6161, 6527, 6914, 7324, 7758,
8218, 8706, 9222, 9770, 10349, 10963, 11613, 12302, 13032, 13805, 14624, 15491, 16410, 17384, 18415,
19508, 20665, 21891, 23189, 24565, 26022, 27566, 29201, 30933, 32767};
void SPDIFSpeaker::setup() {
ESP_LOGCONFIG(TAG, "Setting up SPDIF Audio Speaker...");
this->event_group_ = xEventGroupCreate();
if (this->event_group_ == nullptr) {
ESP_LOGE(TAG, "Failed to create event group");
this->mark_failed();
return;
}
this->spdif_->setup();
this->spdif_->set_block_complete_callback([this](uint32_t *data, size_t size, TickType_t ticks_to_wait) -> esp_err_t {
size_t i2s_write_len;
return i2s_write(this->parent_->get_port(), data, size, &i2s_write_len, ticks_to_wait);
});
#if SPDIF_FILL_SILENCE
memset(silence, 0, sizeof(silence));
#endif
}
void SPDIFSpeaker::loop() {
uint32_t event_group_bits = xEventGroupGetBits(this->event_group_);
if (event_group_bits & SpeakerEventGroupBits::STATE_STARTING) {
ESP_LOGD(TAG, "Starting Speaker");
this->state_ = speaker::STATE_STARTING;
xEventGroupClearBits(this->event_group_, SpeakerEventGroupBits::STATE_STARTING);
}
if (event_group_bits & SpeakerEventGroupBits::STATE_RUNNING) {
ESP_LOGD(TAG, "Started Speaker");
this->state_ = speaker::STATE_RUNNING;
xEventGroupClearBits(this->event_group_, SpeakerEventGroupBits::STATE_RUNNING);
this->status_clear_warning();
this->status_clear_error();
}
if (event_group_bits & SpeakerEventGroupBits::STATE_STOPPING) {
ESP_LOGD(TAG, "Stopping Speaker");
this->state_ = speaker::STATE_STOPPING;
xEventGroupClearBits(this->event_group_, SpeakerEventGroupBits::STATE_STOPPING);
}
if (event_group_bits & SpeakerEventGroupBits::STATE_STOPPED) {
if (!this->task_created_) {
ESP_LOGD(TAG, "Stopped Speaker");
this->state_ = speaker::STATE_STOPPED;
xEventGroupClearBits(this->event_group_, SpeakerEventGroupBits::ALL_BITS);
this->speaker_task_handle_ = nullptr;
}
}
if (event_group_bits & SpeakerEventGroupBits::ERR_TASK_FAILED_TO_START) {
this->status_set_error("Failed to start speaker task");
xEventGroupClearBits(this->event_group_, SpeakerEventGroupBits::ERR_TASK_FAILED_TO_START);
}
if (event_group_bits & SpeakerEventGroupBits::ALL_ERR_ESP_BITS) {
uint32_t error_bits = event_group_bits & SpeakerEventGroupBits::ALL_ERR_ESP_BITS;
ESP_LOGW(TAG, "Error writing to I2S: %s", esp_err_to_name(err_bit_to_esp_err(error_bits)));
this->status_set_warning();
}
if (event_group_bits & SpeakerEventGroupBits::ERR_ESP_NOT_SUPPORTED) {
this->status_set_error("Failed to adjust I2S bus to match the incoming audio");
ESP_LOGE(TAG,
"Incompatible audio format: sample rate = %" PRIu32 ", channels = %" PRIu8 ", bits per sample = %" PRIu8,
this->audio_stream_info_.sample_rate, this->audio_stream_info_.channels,
this->audio_stream_info_.bits_per_sample);
}
}
void SPDIFSpeaker::set_volume(float volume) {
this->volume_ = volume;
// Software volume control by using a Q15 fixed point scaling factor
ssize_t decibel_index = remap<ssize_t, float>(volume, 0.0f, 1.0f, 0, Q15_VOLUME_SCALING_FACTORS.size() - 1);
this->q15_volume_factor_ = Q15_VOLUME_SCALING_FACTORS[decibel_index];
}
void SPDIFSpeaker::set_mute_state(bool mute_state) {
this->mute_state_ = mute_state;
if (mute_state) {
// Software volume control and scale by 0
this->q15_volume_factor_ = 0;
} else {
// Revert to previous volume when unmuting
this->set_volume(this->volume_);
}
}
size_t SPDIFSpeaker::play(const uint8_t *data, size_t length, TickType_t ticks_to_wait) {
if (this->is_failed()) {
ESP_LOGE(TAG, "Cannot play audio, speaker failed to setup");
return 0;
}
if (this->state_ != speaker::STATE_RUNNING && this->state_ != speaker::STATE_STARTING) {
this->start();
}
size_t bytes_written = 0;
if ((this->state_ == speaker::STATE_RUNNING) && (this->audio_ring_buffer_.use_count() == 1)) {
// Only one owner of the ring buffer (the speaker task), so the ring buffer is allocated and no other components are
// attempting to write to it.
// Temporarily share ownership of the ring buffer so it won't be deallocated while writing
std::shared_ptr<RingBuffer> temp_ring_buffer = this->audio_ring_buffer_;
bytes_written = temp_ring_buffer->write_without_replacement((void *) data, length, ticks_to_wait);
}
return bytes_written;
}
bool SPDIFSpeaker::has_buffered_data() const {
if (this->audio_ring_buffer_ != nullptr) {
return this->audio_ring_buffer_->available() > 0;
}
return false;
}
void SPDIFSpeaker::speaker_task(void *params) {
SPDIFSpeaker *this_speaker = (SPDIFSpeaker *) params;
uint32_t event_group_bits =
xEventGroupWaitBits(this_speaker->event_group_,
SpeakerEventGroupBits::COMMAND_START | SpeakerEventGroupBits::COMMAND_STOP |
SpeakerEventGroupBits::COMMAND_STOP_GRACEFULLY, // Bit message to read
pdTRUE, // Clear the bits on exit
pdFALSE, // Don't wait for all the bits,
portMAX_DELAY); // Block indefinitely until a bit is set
if (event_group_bits & (SpeakerEventGroupBits::COMMAND_STOP | SpeakerEventGroupBits::COMMAND_STOP_GRACEFULLY)) {
// Received a stop signal before the task was requested to start
this_speaker->delete_task_(0);
}
xEventGroupSetBits(this_speaker->event_group_, SpeakerEventGroupBits::STATE_STARTING);
audio::AudioStreamInfo audio_stream_info = this_speaker->audio_stream_info_;
const uint32_t bytes_per_ms =
audio_stream_info.channels * audio_stream_info.get_bytes_per_sample() * audio_stream_info.sample_rate / 1000;
const size_t dma_buffers_size =
DMA_BUFFERS_COUNT * SPDIF_BLOCK_SAMPLES * audio_stream_info.channels * audio_stream_info.get_bytes_per_sample();
int task_delay_ms = bytes_per_ms * DMA_BUFFERS_COUNT / 2;
// Ensure ring buffer is at least as large as the total size of the DMA buffers
const size_t ring_buffer_size =
std::max((uint32_t) dma_buffers_size, this_speaker->buffer_duration_ms_ * bytes_per_ms);
if (this_speaker->send_esp_err_to_event_group_(this_speaker->allocate_buffers_(dma_buffers_size, ring_buffer_size))) {
// Failed to allocate buffers
xEventGroupSetBits(this_speaker->event_group_, SpeakerEventGroupBits::ERR_ESP_NO_MEM);
this_speaker->delete_task_(dma_buffers_size);
}
if (!this_speaker->send_esp_err_to_event_group_(this_speaker->start_i2s_driver_(audio_stream_info))) {
xEventGroupSetBits(this_speaker->event_group_, SpeakerEventGroupBits::STATE_RUNNING);
bool stop_gracefully = false;
uint32_t last_data_received_time = millis();
bool tx_dma_underflow = false;
while (!this_speaker->timeout_.has_value() ||
(millis() - last_data_received_time) <= this_speaker->timeout_.value()) {
event_group_bits = xEventGroupGetBits(this_speaker->event_group_);
if (event_group_bits & SpeakerEventGroupBits::COMMAND_STOP) {
break;
}
if (event_group_bits & SpeakerEventGroupBits::COMMAND_STOP_GRACEFULLY) {
stop_gracefully = true;
}
if (this_speaker->audio_stream_info_ != audio_stream_info) {
// Audio stream info has changed, stop the speaker task so it will restart with the proper settings.
break;
}
i2s_event_t i2s_event;
while (xQueueReceive(this_speaker->i2s_event_queue_, &i2s_event, 0)) {
if (i2s_event.type == I2S_EVENT_TX_Q_OVF) {
#if SPDIF_DEBUG
int64_t last_overflow_log_time = 0;
const int64_t min_log_interval_us = 1000000;
int64_t current_time = esp_timer_get_time();
if (current_time - last_overflow_log_time >= min_log_interval_us) {
ESP_LOGE(TAG, "I2S_EVENT_TX_Q_OVF");
last_overflow_log_time = current_time;
}
#endif
#if SPDIF_FILL_SILENCE
// Queue DMA a couple buffers full of silence when we don't have anything else to play
this_speaker->spdif_->reset();
this_speaker->spdif_->write(reinterpret_cast<uint8_t *>(silence), sizeof(silence), 0);
this_speaker->spdif_->write(reinterpret_cast<uint8_t *>(silence), sizeof(silence), 0);
// this_speaker->spdif_->write(reinterpret_cast<uint8_t *>(silence), sizeof(silence), 0);
// this_speaker->spdif_->write(reinterpret_cast<uint8_t *>(silence), sizeof(silence), 0);
#endif
tx_dma_underflow = true;
}
}
size_t bytes_to_read = dma_buffers_size;
size_t bytes_read = this_speaker->audio_ring_buffer_->read((void *) this_speaker->data_buffer_, bytes_to_read,
pdMS_TO_TICKS(task_delay_ms));
if (bytes_read > 0) {
if ((audio_stream_info.bits_per_sample == 16) && (this_speaker->q15_volume_factor_ < INT16_MAX)) {
// Scale samples by the volume factor in place
q15_multiplication((int16_t *) this_speaker->data_buffer_, (int16_t *) this_speaker->data_buffer_,
bytes_read / sizeof(int16_t), this_speaker->q15_volume_factor_);
}
this_speaker->spdif_->write(this_speaker->data_buffer_, bytes_read, portMAX_DELAY);
#if SPDIF_DEBUG
static uint64_t total_bytes = 0;
static uint64_t last_log_time = 0;
static uint64_t last_log_bytes = 0;
total_bytes += bytes_read;
int64_t current_time = esp_timer_get_time();
if (last_log_time == 0) {
last_log_time = current_time;
last_log_bytes = total_bytes;
}
// Check if it's time to log sample statistics (every minute)
if (current_time - last_log_time >= 5000000) {
uint64_t elapsed_time = current_time - last_log_time;
uint64_t bytes_since_last_log = total_bytes - last_log_bytes;
// 4 bytes per 16-bit stereo sample
uint64_t samples = bytes_since_last_log / 4;
float seconds = elapsed_time / 1000000.0f;
float hz = samples / seconds;
ESP_LOGD(TAG, "%llu samples in %.2fs (%.2fHz)", samples, seconds, hz);
// Reset for next log
last_log_time = current_time;
last_log_bytes = total_bytes;
}
#endif
tx_dma_underflow = false;
last_data_received_time = millis();
} else {
// No data received
if (stop_gracefully && tx_dma_underflow) {
break;
}
}
}
xEventGroupSetBits(this_speaker->event_group_, SpeakerEventGroupBits::STATE_STOPPING);
i2s_driver_uninstall(this_speaker->parent_->get_port());
this_speaker->parent_->unlock();
}
this_speaker->delete_task_(dma_buffers_size);
}
void SPDIFSpeaker::start() {
if (!this->is_ready() || this->is_failed() || this->status_has_error())
return;
if ((this->state_ == speaker::STATE_STARTING) || (this->state_ == speaker::STATE_RUNNING))
return;
if (this->speaker_task_handle_ == nullptr) {
xTaskCreate(SPDIFSpeaker::speaker_task, "speaker_task", TASK_STACK_SIZE, (void *) this, TASK_PRIORITY,
&this->speaker_task_handle_);
}
if (this->speaker_task_handle_ != nullptr) {
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::COMMAND_START);
this->task_created_ = true;
} else {
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_TASK_FAILED_TO_START);
}
}
void SPDIFSpeaker::stop() { this->stop_(false); }
void SPDIFSpeaker::finish() { this->stop_(true); }
void SPDIFSpeaker::stop_(bool wait_on_empty) {
if (this->is_failed())
return;
if (this->state_ == speaker::STATE_STOPPED)
return;
if (wait_on_empty) {
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::COMMAND_STOP_GRACEFULLY);
} else {
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::COMMAND_STOP);
}
}
bool SPDIFSpeaker::send_esp_err_to_event_group_(esp_err_t err) {
switch (err) {
case ESP_OK:
return false;
case ESP_ERR_INVALID_STATE:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_INVALID_STATE);
return true;
case ESP_ERR_INVALID_ARG:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_INVALID_ARG);
return true;
case ESP_ERR_INVALID_SIZE:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_INVALID_SIZE);
return true;
case ESP_ERR_NO_MEM:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_NO_MEM);
return true;
case ESP_ERR_NOT_SUPPORTED:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_NOT_SUPPORTED);
return true;
default:
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::ERR_ESP_FAIL);
return true;
}
}
esp_err_t SPDIFSpeaker::allocate_buffers_(size_t data_buffer_size, size_t ring_buffer_size) {
if (this->data_buffer_ == nullptr) {
// Allocate data buffer for temporarily storing audio from the ring buffer before writing to the I2S bus
ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
this->data_buffer_ = allocator.allocate(data_buffer_size);
}
if (this->data_buffer_ == nullptr) {
ESP_LOGE(TAG, "Failed to allocate data_buffer_");
return ESP_ERR_NO_MEM;
}
if (this->audio_ring_buffer_.use_count() == 0) {
// Allocate ring buffer. Uses a shared_ptr to ensure it isn't improperly deallocated.
this->audio_ring_buffer_ = RingBuffer::create(ring_buffer_size);
}
if (this->audio_ring_buffer_ == nullptr) {
ESP_LOGE(TAG, "Failed to allocate audio_ring_buffer_");
return ESP_ERR_NO_MEM;
}
return ESP_OK;
}
esp_err_t SPDIFSpeaker::start_i2s_driver_(audio::AudioStreamInfo &audio_stream_info) {
if (this->sample_rate_ != audio_stream_info.sample_rate) { // NOLINT
// Can't reconfigure I2S bus, so the sample rate must match the configured value
ESP_LOGE(TAG, "SPDIF only supports a single sample rate");
return ESP_ERR_NOT_SUPPORTED;
}
// Currently only 16-bit samples are supported
if (audio_stream_info.bits_per_sample != 16) {
ESP_LOGE(TAG, "SPDIF only supports 16 bits per sample");
return ESP_ERR_NOT_SUPPORTED;
}
// Currently only stereo is supported
if (audio_stream_info.channels != 2) {
ESP_LOGE(TAG, "SPDIF only supports stereo");
return ESP_ERR_NOT_SUPPORTED;
}
if (!this->parent_->try_lock()) {
return ESP_ERR_INVALID_STATE;
}
constexpr uint32_t i2s_bits_per_sample = 32;
uint32_t sample_rate = this->sample_rate_ * 2;
i2s_config_t config = {
.mode = static_cast<i2s_mode_t>(I2S_MODE_MASTER | I2S_MODE_TX),
.sample_rate = sample_rate,
.bits_per_sample = static_cast<i2s_bits_per_sample_t>(i2s_bits_per_sample),
.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
.communication_format = I2S_COMM_FORMAT_STAND_I2S,
.intr_alloc_flags = 0,
.dma_buf_count = DMA_BUFFERS_COUNT,
.dma_buf_len = SPDIF_BLOCK_SIZE_U32,
.use_apll = true,
#if SPDIF_FILL_SILENCE
.tx_desc_auto_clear = false,
#else
.tx_desc_auto_clear = true,
#endif
.fixed_mclk = 0,
.mclk_multiple = I2S_MCLK_MULTIPLE_256,
.bits_per_chan = I2S_BITS_PER_CHAN_DEFAULT,
};
esp_err_t err =
i2s_driver_install(this->parent_->get_port(), &config, I2S_EVENT_QUEUE_COUNT, &this->i2s_event_queue_);
if (err != ESP_OK) {
// Failed to install the driver, so unlock the I2S port
this->parent_->unlock();
return err;
}
i2s_pin_config_t pin_config = {
.mck_io_num = -1,
.bck_io_num = -1,
.ws_io_num = -1,
.data_out_num = this->data_pin_,
.data_in_num = -1,
};
err = i2s_set_pin(this->parent_->get_port(), &pin_config);
if (err != ESP_OK) {
// Failed to set the data out pin, so uninstall the driver and unlock the I2S port
i2s_driver_uninstall(this->parent_->get_port());
this->parent_->unlock();
}
return err;
}
void SPDIFSpeaker::delete_task_(size_t buffer_size) {
this->audio_ring_buffer_.reset(); // Releases ownership of the shared_ptr
if (this->data_buffer_ != nullptr) {
ExternalRAMAllocator<uint8_t> allocator(ExternalRAMAllocator<uint8_t>::ALLOW_FAILURE);
allocator.deallocate(this->data_buffer_, buffer_size);
this->data_buffer_ = nullptr;
}
xEventGroupSetBits(this->event_group_, SpeakerEventGroupBits::STATE_STOPPED);
this->task_created_ = false;
vTaskDelete(nullptr);
}
} // namespace spdif_audio
} // namespace esphome
#endif // USE_ESP32

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#pragma once
#ifdef USE_ESP32
#include "esphome/components/i2s_audio/i2s_audio.h"
#include <driver/i2s.h>
#include <freertos/event_groups.h>
#include <freertos/queue.h>
#include <freertos/FreeRTOS.h>
#include "spdif.h"
#include "esphome/components/audio/audio.h"
#include "esphome/components/speaker/speaker.h"
#include "esphome/core/component.h"
#include "esphome/core/gpio.h"
#include "esphome/core/helpers.h"
#include "esphome/core/ring_buffer.h"
namespace esphome {
namespace spdif_audio {
class SPDIFSpeaker : public Parented<esphome::i2s_audio::I2SAudioComponent>, public speaker::Speaker, public Component {
public:
SPDIFSpeaker() : spdif_(new SPDIF()) {}
float get_setup_priority() const override { return esphome::setup_priority::PROCESSOR; }
void setup() override;
void loop() override;
void set_buffer_duration(uint32_t buffer_duration_ms) { this->buffer_duration_ms_ = buffer_duration_ms; }
void set_timeout(uint32_t ms) { this->timeout_ = ms; }
void set_data_pin(uint8_t pin) { this->data_pin_ = pin; }
void set_sample_rate(uint32_t rate) { this->sample_rate_ = rate; }
void start() override;
void stop() override;
void finish() override;
/// @brief Plays the provided audio data.
/// Starts the speaker task, if necessary. Writes the audio data to the ring buffer.
/// @param data Audio data in the format set by the parent speaker classes ``set_audio_stream_info`` method.
/// @param length The length of the audio data in bytes.
/// @param ticks_to_wait The FreeRTOS ticks to wait before writing as much data as possible to the ring buffer.
/// @return The number of bytes that were actually written to the ring buffer.
size_t play(const uint8_t *data, size_t length, TickType_t ticks_to_wait) override;
size_t play(const uint8_t *data, size_t length) override { return play(data, length, 0); }
bool has_buffered_data() const override;
/// @brief Sets the volume of the speaker. Uses the speaker's configured audio dac component. If unavailble, it is
/// implemented as a software volume control. Overrides the default setter to convert the floating point volume to a
/// Q15 fixed-point factor.
/// @param volume between 0.0 and 1.0
void set_volume(float volume) override;
/// @brief Mutes or unmute the speaker. Uses the speaker's configured audio dac component. If unavailble, it is
/// implemented as a software volume control. Overrides the default setter to convert the floating point volume to a
/// Q15 fixed-point factor.
/// @param mute_state true for muting, false for unmuting
void set_mute_state(bool mute_state) override;
protected:
/// @brief Function for the FreeRTOS task handling audio output.
/// After receiving the COMMAND_START signal, allocates space for the buffers, starts the I2S driver, and reads
/// audio from the ring buffer and writes audio to the I2S port. Stops immmiately after receiving the COMMAND_STOP
/// signal and stops only after the ring buffer is empty after receiving the COMMAND_STOP_GRACEFULLY signal. Stops if
/// the ring buffer hasn't read data for more than timeout_ milliseconds. When stopping, it deallocates the buffers,
/// stops the I2S driver, unlocks the I2S port, and deletes the task. It communicates the state and any errors via
/// event_group_.
/// @param params I2SAudioSpeaker component
static void speaker_task(void *params);
/// @brief Sends a stop command to the speaker task via event_group_.
/// @param wait_on_empty If false, sends the COMMAND_STOP signal. If true, sends the COMMAND_STOP_GRACEFULLY signal.
void stop_(bool wait_on_empty);
/// @brief Sets the corresponding ERR_ESP event group bits.
/// @param err esp_err_t error code.
/// @return True if an ERR_ESP bit is set and false if err == ESP_OK
bool send_esp_err_to_event_group_(esp_err_t err);
/// @brief Allocates the data buffer and ring buffer
/// @param data_buffer_size Number of bytes to allocate for the data buffer.
/// @param ring_buffer_size Number of bytes to allocate for the ring buffer.
/// @return ESP_ERR_NO_MEM if either buffer fails to allocate
/// ESP_OK if successful
esp_err_t allocate_buffers_(size_t data_buffer_size, size_t ring_buffer_size);
/// @brief Starts the ESP32 I2S driver.
/// Attempts to lock the I2S port, starts the I2S driver using the passed in stream information, and sets the data out
/// pin. If it fails, it will unlock the I2S port and uninstall the driver, if necessary.
/// @param audio_stream_info Stream information for the I2S driver.
/// @return ESP_ERR_NOT_ALLOWED if the I2S port can't play the incoming audio stream.
/// ESP_ERR_INVALID_STATE if the I2S port is already locked.
/// ESP_ERR_INVALID_ARG if nstalling the driver or setting the data outpin fails due to a parameter error.
/// ESP_ERR_NO_MEM if the driver fails to install due to a memory allocation error.
/// ESP_FAIL if setting the data out pin fails due to an IO error ESP_OK if successful
esp_err_t start_i2s_driver_(audio::AudioStreamInfo &audio_stream_info);
/// @brief Deletes the speaker's task.
/// Deallocates the data_buffer_ and audio_ring_buffer_, if necessary, and deletes the task. Should only be called by
/// the speaker_task itself.
/// @param buffer_size The allocated size of the data_buffer_.
void delete_task_(size_t buffer_size);
SPDIF *spdif_{nullptr};
TaskHandle_t speaker_task_handle_{nullptr};
EventGroupHandle_t event_group_{nullptr};
QueueHandle_t i2s_event_queue_;
uint8_t *data_buffer_{nullptr};
std::shared_ptr<RingBuffer> audio_ring_buffer_;
uint32_t buffer_duration_ms_;
optional<uint32_t> timeout_;
uint8_t data_pin_;
uint32_t sample_rate_;
bool task_created_{false};
int16_t q15_volume_factor_{INT16_MAX};
};
} // namespace spdif_audio
} // namespace esphome
#endif // USE_ESP32