93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
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#include "audio.h"
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#include "freertos/FreeRTOS.h"
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#include <freertos/task.h>
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#include "esp_system.h"
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#include "driver/i2s.h"
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#include "driver/rtc_io.h"
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#include <stdio.h>
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#include <string.h>
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void _audio_init(int i2s_num) {
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i2s_config_t i2s_config = {
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.mode = I2S_MODE_MASTER | I2S_MODE_TX,
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.sample_rate = 8000,
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.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
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.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
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.communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
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.dma_buf_count = 8,
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.dma_buf_len = 256,
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.intr_alloc_flags = 0,
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.use_apll = false,
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.bits_per_chan = I2S_BITS_PER_SAMPLE_16BIT
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};
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i2s_driver_install(i2s_num, &i2s_config, 0, NULL);
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i2s_pin_config_t pin_config = {
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.mck_io_num = 0,
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.bck_io_num = 4,
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.ws_io_num = 12,
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.data_out_num = 13,
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.data_in_num = I2S_PIN_NO_CHANGE
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};
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i2s_set_pin(i2s_num, &pin_config);
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}
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typedef struct _audio_player_cfg {
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uint8_t* buffer;
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size_t size;
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bool free_buffer;
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} audio_player_cfg_t;
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void audio_player_task(void* arg) {
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audio_player_cfg_t* config = (audio_player_cfg_t*) arg;
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size_t sample_length = config->size;
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uint8_t* sample_buffer = config->buffer;
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size_t count;
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size_t position = 0;
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while (position < sample_length) {
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size_t length = sample_length - position;
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if (length > 256) length = 256;
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uint8_t buffer[256];
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memcpy(buffer, &sample_buffer[position], length);
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for (size_t l = 0; l < length; l+=2) {
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int16_t* sample = (int16_t*) &buffer[l];
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*sample *= 0.50;
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}
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i2s_write(0, buffer, length, &count, portMAX_DELAY);
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if (count != length) {
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printf("i2s_write_bytes: count (%d) != length (%d)\n", count, length);
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abort();
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}
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position += length;
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}
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i2s_zero_dma_buffer(0); // Fill buffer with silence
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if (config->free_buffer) free(sample_buffer);
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vTaskDelete(NULL); // Tell FreeRTOS that the task is done
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}
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void audio_init() {
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_audio_init(0);
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}
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extern const uint8_t boot_snd_start[] asm("_binary_boot_snd_start");
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extern const uint8_t boot_snd_end[] asm("_binary_boot_snd_end");
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audio_player_cfg_t bootsound;
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void play_bootsound() {
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TaskHandle_t handle;
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bootsound.buffer = boot_snd_start,
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bootsound.size = boot_snd_end - boot_snd_start;
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bootsound.free_buffer = false;
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xTaskCreate(&audio_player_task, "Audio player", 4096, (void*) &bootsound, 10, &handle);
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}
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