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#include "jpeg_decoder.h"
#include <string.h>
#include "driver/jpeg_decode.h"
#include "esp_check.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
static const char *TAG = "jpeg";
static jpeg_decoder_handle_t s_engine;
static SemaphoreHandle_t s_mutex;
static void *s_in_buf;
static size_t s_in_cap;
static void *s_out_buf;
static size_t s_out_cap;
esp_err_t jpeg_decoder_init(void)
{
s_mutex = xSemaphoreCreateMutex();
if (!s_mutex) return ESP_ERR_NO_MEM;
jpeg_decode_engine_cfg_t cfg = {
.intr_priority = 0,
.timeout_ms = 200,
};
ESP_RETURN_ON_ERROR(jpeg_new_decoder_engine(&cfg, &s_engine),
TAG, "jpeg_new_decoder_engine");
// DMA-aligned PSRAM scratch buffers. Allocate once, reuse.
jpeg_decode_memory_alloc_cfg_t in_cfg = { .buffer_direction = JPEG_DEC_ALLOC_INPUT_BUFFER };
jpeg_decode_memory_alloc_cfg_t out_cfg = { .buffer_direction = JPEG_DEC_ALLOC_OUTPUT_BUFFER };
s_in_buf = jpeg_alloc_decoder_mem(JPEG_DECODER_MAX_INPUT_BYTES, &in_cfg, &s_in_cap);
if (!s_in_buf) {
ESP_LOGE(TAG, "jpeg input buf alloc failed");
return ESP_ERR_NO_MEM;
}
s_out_buf = jpeg_alloc_decoder_mem(JPEG_DECODER_MAX_OUTPUT_BYTES, &out_cfg, &s_out_cap);
if (!s_out_buf) {
ESP_LOGE(TAG, "jpeg output buf alloc failed");
return ESP_ERR_NO_MEM;
}
ESP_LOGI(TAG, "decoder ready (in=%u bytes, out=%u bytes)",
(unsigned)s_in_cap, (unsigned)s_out_cap);
return ESP_OK;
}
bool jpeg_decoder_try_lock(uint32_t timeout_ms)
{
return xSemaphoreTake(s_mutex, pdMS_TO_TICKS(timeout_ms)) == pdTRUE;
}
void jpeg_decoder_unlock(void)
{
xSemaphoreGive(s_mutex);
}
void *jpeg_decoder_input_buffer(void) { return s_in_buf; }
esp_err_t jpeg_decoder_decode(size_t jpeg_len,
void **out_rgb565,
uint16_t *out_width,
uint16_t *out_height)
{
if (jpeg_len == 0 || jpeg_len > s_in_cap) return ESP_ERR_INVALID_SIZE;
jpeg_decode_cfg_t dec_cfg = {
.output_format = JPEG_DECODE_OUT_FORMAT_RGB565,
.rgb_order = JPEG_DEC_RGB_ELEMENT_ORDER_RGB,
// TODO: known color bug on M5 — solid red renders correctly but solid
// green renders ~black and solid blue renders green. Likely a JPEG
// colorspace / channel-permutation issue, not a byte-order one
// (swapping to BGR turns red into blue, confirming RGB is the right
// element ordering). Needs follow-up.
.conv_std = JPEG_YUV_RGB_CONV_STD_BT601,
};
jpeg_decode_picture_info_t info = {0};
esp_err_t err = jpeg_decoder_get_info(s_in_buf, jpeg_len, &info);
if (err != ESP_OK) {
ESP_LOGW(TAG, "jpeg_decoder_get_info: %s", esp_err_to_name(err));
return err;
}
uint32_t out_size = 0;
err = jpeg_decoder_process(s_engine, &dec_cfg,
s_in_buf, jpeg_len,
s_out_buf, s_out_cap, &out_size);
if (err != ESP_OK) {
ESP_LOGW(TAG, "jpeg_decoder_process: %s", esp_err_to_name(err));
return err;
}
*out_rgb565 = s_out_buf;
*out_width = info.width;
*out_height = info.height;
return ESP_OK;
}
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