1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
#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;
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 buffer for the inbound JPEG body. The
// OUTPUT buffer is no longer owned here — callers pass in a target
// (the display back-buffer) so the decoder writes the BGR888 pixels
// straight into the panel framebuffer with no intermediate copy.
jpeg_decode_memory_alloc_cfg_t in_cfg = { .buffer_direction = JPEG_DEC_ALLOC_INPUT_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;
}
ESP_LOGI(TAG, "decoder ready (in=%u bytes)", (unsigned)s_in_cap);
return ESP_OK;
}
bool jpeg_decoder_try_lock(uint32_t timeout_ms)
{
// Callable before jpeg_decoder_init (e.g. a wake POST landing in the
// display-task boot window) — treat "no decoder yet" as busy.
if (!s_mutex) return false;
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; }
void *jpeg_decoder_alloc_input_buffer(size_t *out_cap)
{
jpeg_decode_memory_alloc_cfg_t in_cfg = { .buffer_direction = JPEG_DEC_ALLOC_INPUT_BUFFER };
size_t cap = 0;
void *buf = jpeg_alloc_decoder_mem(JPEG_DECODER_MAX_INPUT_BYTES, &in_cfg, &cap);
if (out_cap) *out_cap = buf ? cap : 0;
return buf;
}
esp_err_t jpeg_decoder_decode(void *in_buf,
size_t jpeg_len,
void *out_buf,
size_t out_cap,
uint16_t *out_width,
uint16_t *out_height)
{
if (!in_buf) return ESP_ERR_INVALID_ARG;
if (jpeg_len == 0 ||
jpeg_len > JPEG_DECODER_MAX_INPUT_BYTES) return ESP_ERR_INVALID_SIZE;
if (!out_buf || out_cap == 0) return ESP_ERR_INVALID_ARG;
// Hardware decode directly into the caller's BGR888 buffer (the
// panel back-framebuffer in the /frame path). _BGR rgb_order swaps
// the channel layout so memory ends up as [B, G, R] per pixel —
// exactly what the ESP32-P4 DSI engine + TC358762 + Pi panel
// pipeline wants. Zero firmware-side pixel work.
jpeg_decode_cfg_t dec_cfg = {
.output_format = JPEG_DECODE_OUT_FORMAT_RGB888,
.rgb_order = JPEG_DEC_RGB_ELEMENT_ORDER_BGR,
.conv_std = JPEG_YUV_RGB_CONV_STD_BT601,
};
jpeg_decode_picture_info_t info = {0};
esp_err_t err = jpeg_decoder_get_info(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,
in_buf, jpeg_len,
out_buf, out_cap, &out_size);
if (err != ESP_OK) {
ESP_LOGW(TAG, "jpeg_decoder_process: %s", esp_err_to_name(err));
return err;
}
*out_width = info.width;
*out_height = info.height;
return ESP_OK;
}
|
