esp32 使用TFTe_SPI库在TFTlcd播放视频
播放思路来自：https://www.instructables.com/Play-Video-With-ESP32/
参考代码：https://github.com/moononournation/RGB565_video
我参考的是这个工程：
但是这里教程里面使用的是Arduino_GFX Library库来驱动TFT lcd，存在两个问题：
1，lvgl采用Arduino_GFX Library库来移植到TFTlcd上时，显示会畸变，颜色不对（我的是这样的）。
2，所以要使用lvgl，得用TFTe_SPI库，但是该参考项目是基于Arduino_GFX Library库的，我们的移植过来。
视频格式采用MJPEG，这样更快点，视频支持的帧率会更高。
视频播放是在前面博客搭建的框架下加入的。
移植：
1，参考前面的工程代码，需要在display.h，display.c中加入一些东西，其实就是将TFT_eSPI *tft实例声明一下，让外部文件也可以用，这是因为在lvgl中播放视频的话，参考前面博客讲解的思路，处理很慢，视频估计就几帧的帧率，所以需要直接去操控TFT_eSPI *tft，增加刷新速度，以此增加视频帧率。代码如下红色方框所示：
.c文件：
.h文件：
2，如下图所示，参考工程里面除了arduino文件外，还有三个代码，他们就是实现视频播放，视频格式解码的。
先贴上里面的源代码：
MjpegClass.h
#ifndef _MJPEGCLASS_H_ #define _MJPEGCLASS_H_ #pragma GCC optimize("O3") #define READ_BUFFER_SIZE 2048 #include <esp_heap_caps.h> #include <FS.h> #include <Arduino_TFT.h> #include "tjpgdClass.h" class MjpegClass { public: bool setup(File input, uint8_t *mjpeg_buf, Arduino_TFT *tft, bool multiTask) { _input = input; _mjpeg_buf = mjpeg_buf; _tft = tft; _multiTask = multiTask; _tft_width = gfx->width(); _tft_height = gfx->height(); if (!_read_buf) { _read_buf = (uint8_t *)malloc(READ_BUFFER_SIZE); } for (int i = 0; i < 2; ++i) { if (!_out_bufs[i]) { _out_bufs[i] = (uint8_t *)heap_caps_malloc(_tft_width * 48 * 2, MALLOC_CAP_DMA); } } _out_buf = _out_bufs[0]; if (_multiTask) { _jdec.multitask_begin(); } return true; } bool readMjpegBuf() { if (_inputindex == 0) { _buf_read = _input.read(_read_buf, READ_BUFFER_SIZE); _inputindex += _buf_read; } _mjpeg_buf_offset = 0; int i = 3; bool found_FFD9 = false; if (_buf_read > 0) { i = 3; while ((_buf_read > 0) && (!found_FFD9)) { if ((_mjpeg_buf_offset > 0) && (_mjpeg_buf[_mjpeg_buf_offset - 1] == 0xFF) && (_read_buf[0] == 0xD9)) // JPEG trailer { found_FFD9 = true; } else { while ((i < _buf_read) && (!found_FFD9)) { if ((_read_buf[i] == 0xFF) && (_read_buf[i + 1] == 0xD9)) // JPEG trailer { found_FFD9 = true; ++i; } ++i; } } // Serial.printf("i: %d\n", i); memcpy(_mjpeg_buf + _mjpeg_buf_offset, _read_buf, i); _mjpeg_buf_offset += i; size_t o = _buf_read - i; if (o > 0) { // Serial.printf("o: %d\n", o); memcpy(_read_buf, _read_buf + i, o); _buf_read = _input.read(_read_buf + o, READ_BUFFER_SIZE - o); _inputindex += _buf_read; _buf_read += o; // Serial.printf("_buf_read: %d\n", _buf_read); } else { _buf_read = _input.read(_read_buf, READ_BUFFER_SIZE); _inputindex += _buf_read; } i = 0; } if (found_FFD9) { return true; } } return false; } bool drawJpg() { _fileindex = 0; _remain = _mjpeg_buf_offset; TJpgD::JRESULT jres = _jdec.prepare(jpgRead, this); if (jres != TJpgD::JDR_OK) { Serial.printf("prepare failed! %d\r\n", jres); return false; } _out_width = std::min<int32_t>(_jdec.width, _tft_width); _jpg_x = (_tft_width - _jdec.width) >> 1; if (0 > _jpg_x) { _off_x = -_jpg_x; _jpg_x = 0; } else { _off_x = 0; } _out_height = std::min<int32_t>(_jdec.height, _tft_height); _jpg_y = (_tft_height - _jdec.height) >> 1; if (0 > _jpg_y) { _off_y = -_jpg_y; _jpg_y = 0; } else { _off_y = 0; } if (_multiTask) { jres = _jdec.decomp_multitask(jpgWrite16, jpgWriteRow); } else { jres = _jdec.decomp(jpgWrite16, jpgWriteRow); } if (jres != TJpgD::JDR_OK) { Serial.printf("decomp failed! %d\r\n", jres); return false; } return true; } private: File _input; uint8_t *_read_buf; uint8_t *_mjpeg_buf; int32_t _mjpeg_buf_offset = 0; Arduino_TFT *_tft; bool _multiTask; uint8_t *_out_bufs[2]; uint8_t *_out_buf; TJpgD _jdec; int32_t _inputindex = 0; int32_t _buf_read; int32_t _remain = 0; uint32_t _fileindex; int32_t _tft_width; int32_t _tft_height; int32_t _out_width; int32_t _out_height; int32_t _off_x; int32_t _off_y; int32_t _jpg_x; int32_t _jpg_y; static uint32_t jpgRead(TJpgD *jdec, uint8_t *buf, uint32_t len) { MjpegClass *me = (MjpegClass *)jdec->device; if (len > me->_remain) len = me->_remain; if (buf) { memcpy(buf, (const uint8_t *)me->_mjpeg_buf + me->_fileindex, len); } me->_fileindex += len; me->_remain -= len; return len; } // for 16bit color panel static uint32_t jpgWrite16(TJpgD *jdec, void *bitmap, TJpgD::JRECT *rect) { MjpegClass *me = (MjpegClass *)jdec->device; uint16_t *dst = (uint16_t *)me->_out_buf; uint_fast16_t x = rect->left; uint_fast16_t y = rect->top; uint_fast16_t w = rect->right + 1 - x; uint_fast16_t h = rect->bottom + 1 - y; uint_fast16_t outWidth = me->_out_width; uint_fast16_t outHeight = me->_out_height; uint8_t *src = (uint8_t *)bitmap; uint_fast16_t oL = 0, oR = 0; if (rect->right < me->_off_x) return 1; if (x >= (me->_off_x + outWidth)) return 1; if (rect->bottom < me->_off_y) return 1; if (y >= (me->_off_y + outHeight)) return 1; if (me->_off_y > y) { uint_fast16_t linesToSkip = me->_off_y - y; src += linesToSkip * w * 3; h -= linesToSkip; } if (me->_off_x > x) { oL = me->_off_x - x; } if (rect->right >= (me->_off_x + outWidth)) { oR = (rect->right + 1) - (me->_off_x + outWidth); } int_fast16_t line = (w - (oL + oR)); dst += oL + x - me->_off_x; src += oL * 3; do { int i = 0; do { uint_fast8_t r8 = src[i * 3 + 0] & 0xF8; uint_fast8_t g8 = src[i * 3 + 1]; uint_fast8_t b5 = src[i * 3 + 2] >> 3; r8 |= g8 >> 5; g8 &= 0x1C; b5 = (g8 << 3) + b5; dst[i] = r8 | b5 << 8; } while (++i != line); dst += outWidth; src += w * 3; } while (--h); return 1; } static uint32_t jpgWriteRow(TJpgD *jdec, uint32_t y, uint32_t h) { static int flip = 0; MjpegClass *me = (MjpegClass *)jdec->device; if (y == 0) { me->_tft->setAddrWindow(me->_jpg_x, me->_jpg_y, jdec->width, jdec->height); } me->_tft->startWrite(); me->_tft->writeBytes((uint8_t *)me->_out_buf, jdec->width * h * 2); me->_tft->endWrite(); flip = !flip; me->_out_buf = me->_out_bufs[flip]; return 1; } }; #endif // _MJPEGCLASS_H_
tjpgdClass.cpp
/*----------------------------------------------------------------------------/ / TJpgDec - Tiny JPEG Decompressor R0.01c (C)ChaN, 2019 /-----------------------------------------------------------------------------/ / The TJpgDec is a generic JPEG decompressor module for tiny embedded systems. / This is a free software that opened for education, research and commercial / developments under license policy of following terms. / / Copyright (C) 2019, ChaN, all right reserved. / / * The TJpgDec module is a free software and there is NO WARRANTY. / * No restriction on use. You can use, modify and redistribute it for / personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY. / * Redistributions of source code must retain the above copyright notice. / /-----------------------------------------------------------------------------/ / Oct 04, 2011 R0.01 First release. / Feb 19, 2012 R0.01a Fixed decompression fails when scan starts with an escape seq. / Sep 03, 2012 R0.01b Added JD_TBLCLIP option. / Mar 16, 2019 R0.01c Supprted stdint.h. /----------------------------------------------------------------------------/ / May 2019 ～ July 2020 Tweak for ESP32 ( modify by lovyan03 ) /----------------------------------------------------------------------------*/ #pragma GCC optimize ("O3") #include "tjpgdClass.h" #include <string.h> // for memcpy memset #include <freertos/FreeRTOS.h> #include <freertos/task.h> #include <freertos/queue.h> /*-----------------------------------------------*/ /* Zigzag-order to raster-order conversion table */ /*-----------------------------------------------*/ #define ZIG(n) Zig[n] static const uint8_t Zig[64] = { /* Zigzag-order to raster-order conversion table */ 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63 }; /*-------------------------------------------------*/ /* Input scale factor of Arai algorithm */ /* (scaled up 16 bits for fixed point operations) */ /*-------------------------------------------------*/ #define IPSF(n) Ipsf[n] static const uint16_t Ipsf[64] = { /* See also aa_idct.png */ (uint16_t)(1.00000*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.17588*8192), (uint16_t)(1.00000*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.27590*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.92388*8192), (uint16_t)(1.81226*8192), (uint16_t)(1.63099*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.08979*8192), (uint16_t)(0.75066*8192), (uint16_t)(0.38268*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.81226*8192), (uint16_t)(1.70711*8192), (uint16_t)(1.53636*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.02656*8192), (uint16_t)(0.70711*8192), (uint16_t)(0.36048*8192), (uint16_t)(1.17588*8192), (uint16_t)(1.63099*8192), (uint16_t)(1.53636*8192), (uint16_t)(1.38268*8192), (uint16_t)(1.17588*8192), (uint16_t)(0.92388*8192), (uint16_t)(0.63638*8192), (uint16_t)(0.32442*8192), (uint16_t)(1.00000*8192), (uint16_t)(1.38704*8192), (uint16_t)(1.30656*8192), (uint16_t)(1.17588*8192), (uint16_t)(1.00000*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.27590*8192), (uint16_t)(0.78570*8192), (uint16_t)(1.08979*8192), (uint16_t)(1.02656*8192), (uint16_t)(0.92388*8192), (uint16_t)(0.78570*8192), (uint16_t)(0.61732*8192), (uint16_t)(0.42522*8192), (uint16_t)(0.21677*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.75066*8192), (uint16_t)(0.70711*8192), (uint16_t)(0.63638*8192), (uint16_t)(0.54120*8192), (uint16_t)(0.42522*8192), (uint16_t)(0.29290*8192), (uint16_t)(0.14932*8192), (uint16_t)(0.27590*8192), (uint16_t)(0.38268*8192), (uint16_t)(0.36048*8192), (uint16_t)(0.32442*8192), (uint16_t)(0.27590*8192), (uint16_t)(0.21678*8192), (uint16_t)(0.14932*8192), (uint16_t)(0.07612*8192) }; /*---------------------------------------------*/ /* Output bayer pattern table */ /*---------------------------------------------*/ static const int8_t Bayer[8][32] = { { 0, 4, 1, 5, 0, 4, 1, 5, -2, 2,-1, 3, -2, 2,-1, 3, 1, 5, 0, 4, 1, 5, 0, 4, -1, 3,-2, 2, -1, 3,-2, 2}, { 1, 5, 0, 4, 1, 5, 0, 4, -1, 3,-2, 2, -1, 3,-2, 2, 0, 4, 1, 5, 0, 4, 1, 5, -2, 2,-1, 3, -2, 2,-1, 3}, { 2,-1, 3,-2, 2,-1, 3,-2, 5, 0, 4, 1, 5, 0, 4, 1, 3,-2, 2,-1, 3,-2, 2,-1, 4, 1, 5, 0, 4, 1, 5, 0}, { 3,-2, 2,-1, 3,-2, 2,-1, 4, 1, 5, 0, 4, 1, 5, 0, 2,-1, 3,-2, 2,-1, 3,-2, 5, 0, 4, 1, 5, 0, 4, 1}, { 4, 1, 5, 0, 4, 1, 5, 0, 2,-1, 3,-2, 2,-1, 3,-2, 5, 0, 4, 1, 5, 0, 4, 1, 3,-2, 2,-1, 3,-2, 2,-1}, { 5, 0, 4, 1, 5, 0, 4, 1, 3,-2, 2,-1, 3,-2, 2,-1, 4, 1, 5, 0, 4, 1, 5, 0, 2,-1, 3,-2, 2,-1, 3,-2}, {-2, 2,-1, 3, -2, 2,-1, 3, 1, 5, 0, 4, 1, 5, 0, 4, -1, 3,-2, 2, -1, 3,-2, 2, 0, 4, 1, 5, 0, 4, 1, 5}, {-1, 3,-2, 2, -1, 3,-2, 2, 0, 4, 1, 5, 0, 4, 1, 5, -2, 2,-1, 3, -2, 2,-1, 3, 1, 5, 0, 4, 1, 5, 0, 4} }; /*---------------------------------------------*/ /* Conversion table for fast clipping process */ /*---------------------------------------------*/ #if JD_TBLCLIP #define BYTECLIP(v) Clip8[(uint16_t)(v) & 0x3FF] static const uint8_t Clip8[1024] = { /* 0..255 */ 0, 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, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, /* 256..511 */ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, /* -512..-257 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* -256..-1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; #else /* JD_TBLCLIP */ inline uint_fast8_t BYTECLIP ( int32_t val ) { if (val < 0) val = 0; else if (val > 255) val = 255; return val; } #endif /*-----------------------------------------------------------------------*/ /* Allocate a memory block from memory pool */ /*-----------------------------------------------------------------------*/ static void* alloc_pool ( /* Pointer to allocated memory block (NULL:no memory available) */ TJpgD* jd, /* Pointer to the decompressor object */ uint_fast16_t nd /* Number of bytes to allocate */ ) { char *rp = 0; nd = (nd + 3) & ~3; /* Align block size to the word boundary */ if (jd->sz_pool >= nd) { jd->sz_pool -= nd; rp = (char*)jd->pool; /* Get start of available memory pool */ jd->pool = (void*)(rp + nd); /* Allocate requierd bytes */ } return (void*)rp; /* Return allocated memory block (NULL:no memory to allocate) */ } /*-----------------------------------------------------------------------*/ /* Create de-quantization and prescaling tables with a DQT segment */ /*-----------------------------------------------------------------------*/ static int create_qt_tbl ( /* 0:OK, !0:Failed */ TJpgD* jd, /* Pointer to the decompressor object */ const uint8_t* data, /* Pointer to the quantizer tables */ uint_fast16_t ndata /* Size of input data */ ) { uint_fast8_t d, z; int32_t *pb; do { /* Process all tables in the segment */ d = *data++; /* Get table property */ if (d & 0xF0) return TJpgD::JDR_FMT1; /* Err: not 8-bit resolution */ pb = (int32_t*)alloc_pool(jd, 64 * sizeof (int32_t));/* Allocate a memory block for the table */ if (!pb) return TJpgD::JDR_MEM1; /* Err: not enough memory */ jd->qttbl[d & 3] = pb; /* Register the table */ for (size_t i = 0; i < 64; ++i) { /* Load the table */ z = ZIG(i); /* Zigzag-order to raster-order conversion */ pb[z] = (int32_t)((uint32_t)data[i] * IPSF(z)); /* Apply scale factor of Arai algorithm to the de-quantizers */ } data += 64; } while (ndata -= 65); return TJpgD::JDR_OK; } /*-----------------------------------------------------------------------*/ /* Create huffman code tables with a DHT segment */ /*-----------------------------------------------------------------------*/ static int create_huffman_tbl ( /* 0:OK, !0:Failed */ TJpgD* jd, /* Pointer to the decompressor object */ const uint8_t* data, /* Pointer to the packed huffman tables */ uint_fast16_t ndata /* Size of input data */ ) { uint_fast16_t d, b, np, cls, num, hc; uint8_t *pb, *pd; uint_fast16_t *ph; do { /* Process all tables in the segment */ d = *data++; /* Get table number and class */ if (d & 0xEE) return TJpgD::JDR_FMT1; /* Err: invalid class/number */ cls = d >> 4; num = d & 0x0F; /* class = dc(0)/ac(1), table number = 0/1 */ pb = (uint8_t*)alloc_pool(jd, 16); /* Allocate a memory block for the bit distribution table */ if (!pb) return TJpgD::JDR_MEM1; /* Err: not enough memory */ jd->huffbits[num][cls] = pb - 1; np = 0; for (size_t i = 0; i < 16; ++i) { /* Load number of patterns for 1 to 16-bit code */ np += (pb[i] = data[i]); /* Get sum of code words for each code */ } ph = (uint_fast16_t*)alloc_pool(jd, (np * sizeof (uint_fast16_t)));/* Allocate a memory block for the code word table */ if (!ph) return TJpgD::JDR_MEM1; /* Err: not enough memory */ jd->huffcode[num][cls] = ph - 1; hc = 0; for (size_t i = 0; i < 16; ++i) { /* Re-build huffman code word table */ b = pb[i]; while (b--) *ph++ = hc++; hc <<= 1; } pd = (uint8_t*)alloc_pool(jd, np); /* Allocate a memory block for the decoded data */ if (!pd) return TJpgD::JDR_MEM1; /* Err: not enough memory */ jd->huffdata[num][cls] = pd - 1; memcpy(pd, data += 16, np); /* Load decoded data corresponds to each code ward */ data += np; } while (ndata -= 17 + np); return TJpgD::JDR_OK; } /*-----------------------------------------------------------------------*/ /* Extract N bits from input stream */ /*-----------------------------------------------------------------------*/ static inline int_fast16_t bitext ( /* >=0: extracted data, <0: error code */ TJpgD* jd, /* Pointer to the decompressor object */ int_fast16_t nbit /* Number of bits to extract (1 to 11) */ ) { uint8_t *dp = jd->dptr; /* Bit mask, number of data available, read ptr */ uint_fast8_t s = *dp; uint_fast8_t msk = jd->dmsk; uint_fast16_t v = 0; if (msk) { if (msk >= nbit) { msk -= nbit; jd->dmsk = msk; return (s >> msk) & ((1 << nbit) - 1); /* Get bits */ } nbit -= msk; v = (s & ((1 << msk) - 1)) << nbit; /* Get bits */ } uint8_t *dpend = jd->dpend; for (;;) { if (++dp == dpend) { /* No input data is available, re-fill input buffer */ dp = jd->inbuf; /* Top of input buffer */ jd->dpend = dpend = dp + jd->infunc(jd, dp, TJPGD_SZBUF); if (dp == dpend) return 0 - (int_fast16_t)TJpgD::JDR_INP; /* Err: read error or wrong stream termination */ } s = *dp; /* Get next data byte */ if (s == 0xFF) { /* Is start of flag sequence? */ if (++dp == dpend) { /* No input data is available, re-fill input buffer */ dp = jd->inbuf; /* Top of input buffer */ jd->dpend = dpend = dp + jd->infunc(jd, dp, TJPGD_SZBUF); if (dp == dpend) return 0 - (int_fast16_t)TJpgD::JDR_INP; /* Err: read error or wrong stream termination */ } if (*dp != 0) return 0 - (int_fast16_t)TJpgD::JDR_FMT1; /* Err: unexpected flag is detected (may be collapted data) */ *dp = s; /* The flag is a data 0xFF */ } if (8 >= nbit) { msk = 8 - nbit; jd->dmsk = msk; jd->dptr = dp; return v + ((s >> msk) & ((1 << nbit) - 1)); /* Get bits */ } nbit -= 8; v |= s << nbit; /* Get bits */ } } /*-----------------------------------------------------------------------*/ /* Extract a huffman decoded data from input stream */ /*-----------------------------------------------------------------------*/ static int_fast16_t huffext ( /* >=0: decoded data, <0: error code */ TJpgD* jd, /* Pointer to the decompressor object */ const uint8_t* hbits, /* Pointer to the bit distribution table */ const uint_fast16_t* hcode, /* Pointer to the code word table */ const uint8_t* hdata /* Pointer to the data table */ ) { uint_fast8_t msk = jd->dmsk; uint8_t *dpend = jd->dpend; /* Bit mask, number of data available, read ptr */ uint8_t *dp = jd->dptr; uint_fast8_t s = *dp; uint_fast8_t v = 0; uint_fast8_t bl = 16; /* Max code length */ for (;;) { if (!msk) { /* Next byte? */ msk = 8; /* Read from MSB */ if (++dp == dpend) { /* No input data is available, re-fill input buffer */ dp = jd->inbuf; /* Top of input buffer */ jd->dpend = dpend = dp + jd->infunc(jd, dp, TJPGD_SZBUF); if (dp == dpend) return 0 - (int_fast16_t)TJpgD::JDR_INP; /* Err: read error or wrong stream termination */ } s = *dp; /* Get next data byte */ if (s == 0xFF) { /* Is start of flag sequence? */ if (++dp == dpend) { /* No input data is available, re-fill input buffer */ dp = jd->inbuf; /* Top of input buffer */ jd->dpend = dpend = dp + jd->infunc(jd, dp, TJPGD_SZBUF); if (dp == dpend) return 0 - (int_fast16_t)TJpgD::JDR_INP; /* Err: read error or wrong stream termination */ } if (*dp != 0) return 0 - (int_fast16_t)TJpgD::JDR_FMT1; /* Err: unexpected flag is detected (may be collapted data) */ *dp = s; /* The flag is a data 0xFF */ } } do { v = (v << 1) + ((s >> (--msk)) & 1); /* Get a bit */ uint_fast8_t nd = *++hbits; if (nd) { do { ++hdata; if (v == *++hcode) goto huffext_match; /* Matched? */ } while (--nd); /* Search the code word in this bit length */ } if (!--bl) return 0 - (int_fast16_t)TJpgD::JDR_FMT1; /* Err: code not found (may be collapted data) */ } while (msk); } huffext_match: jd->dmsk = msk; jd->dptr = dp; return *hdata; /* Return the decoded data */ } /*-----------------------------------------------------------------------*/ /* Apply Inverse-DCT in Arai Algorithm (see also aa_idct.png) */ /*-----------------------------------------------------------------------*/ static void block_idct ( int32_t* src, /* Input block data (de-quantized and pre-scaled for Arai Algorithm) */ uint8_t* dst /* Pointer to the destination to store the block as byte array */ ) { const int32_t M13 = (int32_t)(1.41421*256), M4 = (int32_t)(2.61313*256); const float F2 = 1.08239, F5 = 1.84776; int32_t v0, v1, v2, v3, v4, v5, v6, v7; int32_t t10, t11, t12, t13; /* Process columns */ for (size_t i = 0; i < 8; ++i) { /* Get and Process the even elements */ t12 = src[8 * 0]; t10 = src[8 * 4]; t10 += t12; t12 = (t12 << 1) - t10; t11 = src[8 * 2]; t13 = src[8 * 6]; t13 += t11; t11 = (t11 << 1) - t13; t11 = t11 * M13 >> 8; t11 = t11 - t13; v0 = t10 + t13; v3 = t10 - t13; v1 = t12 + t11; v2 = t12 - t11; /* Get and Process the odd elements */ v4 = src[8 * 1]; v5 = src[8 * 7]; v5 += v4; v4 = (v4 << 1) - v5; v7 = src[8 * 3]; v6 = src[8 * 5]; v6 -= v7; v7 = (v7 << 1) + v6; v7 += v5; t13 = v4 + v6; t13 *= F5; v6 = v6 * M4 >> 8; v6 += v7; v6 = t13 - v6; v5 = (v5 << 1) - v7; v5 = v5 * M13 >> 8; v5 -= v6; v4 *= F2; v4 += v5; v4 = t13 - v4; /* Write-back transformed values */ src[8 * 0] = v0 + v7; src[8 * 7] = v0 - v7; src[8 * 1] = v1 + v6; src[8 * 6] = v1 - v6; src[8 * 2] = v2 + v5; src[8 * 5] = v2 - v5; src[8 * 3] = v3 + v4; src[8 * 4] = v3 - v4; ++src; /* Next column */ } /* Process rows */ src -= 8; for (size_t i = 0; i < 8; ++i) { /* Get and Process the even elements */ t12 = src[0] + (128L << 8); /* remove DC offset (-128) here */ t10 = src[4]; t10 += t12; t12 = (t12 << 1) - t10; t11 = src[2]; t13 = src[6]; t13 += t11; t11 = (t11 << 1) - t13; t11 = t11 * M13 >> 8; t11 -= t13; v0 = t10 + t13; v3 = t10 - t13; v1 = t12 + t11; v2 = t12 - t11; /* Get and Process the odd elements */ v4 = src[1]; v5 = src[7]; v5 += v4; v4 = (v4 << 1) - v5; v7 = src[3]; v6 = src[5]; v6 -= v7; v7 = (v7 << 1) + v6; v7 += v5; t13 = v4 + v6; t13 *= F5; v6 = v6 * M4 >> 8; v6 += v7; v6 = t13 - v6; v5 = (v5 << 1) - v7; v5 = v5 * M13 >> 8; v5 -= v6; v4 *= F2; v4 += v5; v4 = t13 - v4; /* Descale the transformed values 8 bits and output */ dst[0] = BYTECLIP((v0 + v7) >> 8); dst[7] = BYTECLIP((v0 - v7) >> 8); dst[1] = BYTECLIP((v1 + v6) >> 8); dst[6] = BYTECLIP((v1 - v6) >> 8); dst[2] = BYTECLIP((v2 + v5) >> 8); dst[5] = BYTECLIP((v2 - v5) >> 8); dst[3] = BYTECLIP((v3 + v4) >> 8); dst[4] = BYTECLIP((v3 - v4) >> 8); dst += 8; src += 8; /* Next row */ } } /*-----------------------------------------------------------------------*/ /* Load all blocks in the MCU into working buffer */ /*-----------------------------------------------------------------------*/ static TJpgD::JRESULT mcu_load ( TJpgD* jd, /* Pointer to the decompressor object */ uint8_t* bp, /* mcubuf */ int32_t* tmp /* Block working buffer for de-quantize and IDCT */ ) { int_fast16_t b, d, e; uint_fast8_t blk, nby, nbc, i, z; const uint8_t *hb, *hd; const uint_fast16_t *hc; nby = jd->msx * jd->msy; /* Number of Y blocks (1, 2 or 4) */ nbc = 2; /* Number of C blocks (2) */ for (blk = 0; blk < nby + nbc; blk++) { uint_fast8_t cmp = (blk < nby) ? 0 : blk - nby + 1; /* Component number 0:Y, 1:Cb, 2:Cr */ uint_fast8_t id = cmp ? 1 : 0; /* Huffman table ID of the component */ /* Extract a DC element from input stream */ hb = jd->huffbits[id][0]; /* Huffman table for the DC element */ hc = jd->huffcode[id][0]; hd = jd->huffdata[id][0]; b = huffext(jd, hb, hc, hd); /* Extract a huffman coded data (bit length) */ if (b < 0) return (TJpgD::JRESULT)(-b); /* Err: invalid code or input */ d = jd->dcv[cmp]; /* DC value of previous block */ if (b) { /* If there is any difference from previous block */ e = bitext(jd, b); /* Extract data bits */ if (e < 0) return (TJpgD::JRESULT)(-e); /* Err: input */ b = 1 << (b - 1); /* MSB position */ if (!(e & b)) e -= (b << 1) - 1; /* Restore sign if needed */ d += e; /* Get current value */ jd->dcv[cmp] = d; /* Save current DC value for next block */ } const int32_t *dqf = jd->qttbl[jd->qtid[cmp]]; /* De-quantizer table ID for this component */ tmp[0] = d * dqf[0] >> 8; /* De-quantize, apply scale factor of Arai algorithm and descale 8 bits */ /* Extract following 63 AC elements from input stream */ memset(&tmp[1], 0, 4 * 63); /* Clear rest of elements */ hb = jd->huffbits[id][1]; /* Huffman table for the AC elements */ hc = jd->huffcode[id][1]; hd = jd->huffdata[id][1]; i = 1; /* Top of the AC elements */ do { b = huffext(jd, hb, hc, hd); /* Extract a huffman coded value (zero runs and bit length) */ if (b == 0) break; /* EOB? */ if (b < 0) return (TJpgD::JRESULT)(-b); /* Err: invalid code or input error */ i += b >> 4; if (b &= 0x0F) { /* Bit length */ d = bitext(jd, b); /* Extract data bits */ if (d < 0) return (TJpgD::JRESULT)(-d);/* Err: input device */ b = 1 << (b - 1); /* MSB position */ if (!(d & b)) d -= (b << 1) - 1;/* Restore negative value if needed */ z = ZIG(i); /* Zigzag-order to raster-order converted index */ tmp[z] = d * dqf[z] >> 8; /* De-quantize, apply scale factor of Arai algorithm and descale 8 bits */ } } while (++i != 64); /* Next AC element */ block_idct(tmp, bp); /* Apply IDCT and store the block to the MCU buffer */ bp += 64; /* Next block */ } return TJpgD::JDR_OK; /* All blocks have been loaded successfully */ } /*-----------------------------------------------------------------------*/ /* Output an MCU: Convert YCrCb to RGB and output it in RGB form */ /*-----------------------------------------------------------------------*/ static TJpgD::JRESULT mcu_output ( TJpgD* jd, /* Pointer to the decompressor object */ uint8_t* mcubuf, uint8_t* workbuf, uint32_t (*outfunc)(TJpgD*, void*, TJpgD::JRECT*), /* RGB output function */ uint_fast16_t x, /* MCU position in the image (left of the MCU) */ uint_fast16_t y /* MCU position in the image (top of the MCU) */ ) { uint_fast16_t ix, iy, mx, my, rx, ry; uint8_t *py, *pc; TJpgD::JRECT rect; mx = jd->msx * 8; my = jd->msy * 8; /* MCU size (pixel) */ rx = (x + mx <= jd->width) ? mx : jd->width - x; /* Output rectangular size (it may be clipped at right/bottom end) */ ry = (y + my <= jd->height) ? my : jd->height - y; rect.left = x; rect.right = x + rx - 1; /* Rectangular area in the frame buffer */ rect.top = y; rect.bottom = y + ry - 1; static constexpr float frr = 1.402; static constexpr float fgr = 0.71414; static constexpr float fgb = 0.34414; static constexpr float fbb = 1.772; /* Build an RGB MCU from discrete comopnents */ const int8_t* btbase = Bayer[jd->bayer]; const int8_t* btbl; uint_fast8_t ixshift = (mx == 16); uint_fast8_t iyshift = (my == 16); iy = 0; uint8_t* prgb = workbuf; do { btbl = &btbase[(iy & 3) << 3]; py = &mcubuf[((iy & 8) + iy) << 3]; pc = &mcubuf[((mx << iyshift) + (iy >> iyshift)) << 3]; ix = 0; do { do { float cb = (pc[ 0] - 128); /* Get Cb/Cr component and restore right level */ float cr = (pc[64] - 128); ++pc; /* Convert CbCr to RGB */ int32_t gg = fgb * cb + fgr * cr; int32_t rr = frr * cr; int32_t bb = fbb * cb; int32_t yy = btbl[0] + py[0]; /* Get Y component */ prgb[0] = BYTECLIP(yy + rr); prgb[1] = BYTECLIP(yy - gg); prgb[2] = BYTECLIP(yy + bb); if (ixshift) { yy = btbl[1] + py[1]; /* Get Y component */ prgb[3] = BYTECLIP(yy + rr); prgb[4] = BYTECLIP(yy - gg); prgb[5] = BYTECLIP(yy + bb); } prgb += 3 << ixshift; btbl += 1 << ixshift; py += 1 << ixshift; ix += 1 << ixshift; } while (ix & 7); btbl -= 8; py += 64 - 8; /* Jump to next block if double block heigt */ } while (ix != mx); } while (++iy != my); if (rx < mx) { uint8_t *s, *d; s = d = (uint8_t*)workbuf; rx *= 3; mx *= 3; for (size_t y = 1; y < ry; ++y) { memcpy(d += rx, s += mx, rx); /* Copy effective pixels */ } } /* Output the RGB rectangular */ return outfunc(jd, workbuf, &rect) ? TJpgD::JDR_OK : TJpgD::JDR_INTR; } /*-----------------------------------------------------------------------*/ /* Process restart interval */ /*-----------------------------------------------------------------------*/ static TJpgD::JRESULT restart ( TJpgD* jd, /* Pointer to the decompressor object */ uint_fast16_t rstn /* Expected restert sequense number */ ) { uint_fast16_t d; uint8_t *dp, *dpend; /* Discard padding bits and get two bytes from the input stream */ dp = jd->dptr; dpend = jd->dpend; d = 0; for (size_t i = 0; i < 2; i++) { if (++dp == dpend) { /* No input data is available, re-fill input buffer */ dp = jd->inbuf; jd->dpend = dpend = dp + jd->infunc(jd, dp, TJPGD_SZBUF); if (dp == dpend) return TJpgD::JDR_INP; } d = (d << 8) | *dp; /* Get a byte */ } jd->dptr = dp; jd->dmsk = 0; /* Check the marker */ if ((d & 0xFFD8) != 0xFFD0 || (d & 7) != (rstn & 7)) { return TJpgD::JDR_FMT1; /* Err: expected RSTn marker is not detected (may be collapted data) */ } /* Reset DC offset */ jd->dcv[2] = jd->dcv[1] = jd->dcv[0] = 0; return TJpgD::JDR_OK; } /*-----------------------------------------------------------------------*/ /* Analyze the JPEG image and Initialize decompressor object */ /*-----------------------------------------------------------------------*/ #define LDB_WORD(ptr) (uint16_t)(((uint16_t)*((uint8_t*)(ptr))<<8)|(uint16_t)*(uint8_t*)((ptr)+1)) TJpgD::JRESULT TJpgD::prepare ( uint32_t (*infunc)(TJpgD*, uint8_t*, uint32_t), /* JPEG strem input function */ void* dev /* I/O device identifier for the session */ ) { uint8_t *seg; uint_fast8_t b, marker; uint_fast16_t i, len; TJpgD::JRESULT rc; static constexpr uint_fast16_t sz_pool = 3900; static uint8_t pool[sz_pool]; this->pool = pool; /* Work memroy */ this->sz_pool = sz_pool; /* Size of given work memory */ this->infunc = infunc; /* Stream input function */ this->device = dev; /* I/O device identifier */ this->nrst = 0; /* No restart interval (default) */ inbuf = seg = dptr = (uint8_t*)alloc_pool(this, TJPGD_SZBUF); /* Allocate stream input buffer */ if (!seg) return TJpgD::JDR_MEM1; uint32_t dctr = infunc(this, dptr, TJPGD_SZBUF); seg = dptr; if (dctr <= 2) return TJpgD::JDR_INP;/* Check SOI marker */ if (LDB_WORD(seg) != 0xFFD8) return TJpgD::JDR_FMT1; /* Err: SOI is not detected */ dptr += 2; dctr -= 2; for (;;) { /* Get a JPEG marker */ if (dctr < 4) { if (4 > (TJPGD_SZBUF - (dptr - inbuf))) return TJpgD::JDR_MEM2; dctr += infunc(this, dptr + dctr, 4); if (dctr < 4) return TJpgD::JDR_INP; } seg = dptr; dptr += 4; dctr -= 4; if (*seg++ != 0xFF) return TJpgD::JDR_FMT1; marker = *(seg++); /* Marker */ len = LDB_WORD(seg); /* Length field */ if (len <= 2) return TJpgD::JDR_FMT1; len -= 2; /* Content size excluding length field */ /* Load segment data */ if (dctr < len) { if (len - dctr > (TJPGD_SZBUF - (dptr - inbuf))) return TJpgD::JDR_MEM2; dctr += infunc(this, dptr + dctr, len - dctr); if (dctr < len) return TJpgD::JDR_INP; } seg = dptr; dptr += len; dctr -= len; switch (marker) { case 0xC0: /* SOF0 (baseline JPEG) */ width = LDB_WORD(seg+3); /* Image width in unit of pixel */ height = LDB_WORD(seg+1); /* Image height in unit of pixel */ if (seg[5] != 3) return TJpgD::JDR_FMT3; /* Err: Supports only Y/Cb/Cr format */ /* Check three image components */ for (i = 0; i < 3; i++) { b = seg[7 + 3 * i]; /* Get sampling factor */ if (!i) { /* Y component */ if (b != 0x11 && b != 0x22 && b != 0x21) { /* Check sampling factor */ return TJpgD::JDR_FMT3; /* Err: Supports only 4:4:4, 4:2:0 or 4:2:2 */ } msx = b >> 4; msy = b & 15; /* Size of MCU [blocks] */ } else { /* Cb/Cr component */ if (b != 0x11) return TJpgD::JDR_FMT3; /* Err: Sampling factor of Cr/Cb must be 1 */ } b = seg[8 + 3 * i]; /* Get dequantizer table ID for this component */ if (b > 3) return TJpgD::JDR_FMT3; /* Err: Invalid ID */ qtid[i] = b; } break; case 0xDD: /* DRI */ /* Get restart interval (MCUs) */ nrst = LDB_WORD(seg); break; case 0xC4: /* DHT */ /* Create huffman tables */ rc = (TJpgD::JRESULT)create_huffman_tbl(this, seg, len); if (rc) return rc; break; case 0xDB: /* DQT */ /* Create de-quantizer tables */ rc = (TJpgD::JRESULT)create_qt_tbl(this, seg, len); if (rc) return rc; break; case 0xDA: /* SOS */ if (!width || !height) return TJpgD::JDR_FMT1; /* Err: Invalid image size */ if (seg[0] != 3) return TJpgD::JDR_FMT3; /* Err: Supports only three color components format */ /* Check if all tables corresponding to each components have been loaded */ for (i = 0; i < 3; i++) { b = seg[2 + 2 * i]; /* Get huffman table ID */ if (b != 0x00 && b != 0x11) return TJpgD::JDR_FMT3; /* Err: Different table number for DC/AC element */ b = i ? 1 : 0; if (!huffbits[b][0] || !huffbits[b][1]) { /* Check dc/ac huffman table for this component */ return TJpgD::JDR_FMT1; /* Err: Nnot loaded */ } if (!qttbl[qtid[i]]) { /* Check dequantizer table for this component */ return TJpgD::JDR_FMT1; /* Err: Not loaded */ } } /* Allocate working buffer for MCU and RGB */ if (!msy || !msx) return TJpgD::JDR_FMT1; /* Err: SOF0 has not been loaded */ dmsk = 0; dpend = dptr + dctr; --dptr; return TJpgD::JDR_OK; /* Initialization succeeded. Ready to decompress the JPEG image. */ case 0xC1: /* SOF1 */ case 0xC2: /* SOF2 */ case 0xC3: /* SOF3 */ case 0xC5: /* SOF5 */ case 0xC6: /* SOF6 */ case 0xC7: /* SOF7 */ case 0xC9: /* SOF9 */ case 0xCA: /* SOF10 */ case 0xCB: /* SOF11 */ case 0xCD: /* SOF13 */ case 0xCE: /* SOF14 */ case 0xCF: /* SOF15 */ case 0xD9: /* EOI */ return TJpgD::JDR_FMT3; /* Unsuppoted JPEG standard (may be progressive JPEG) */ default: /* Unknown segment (comment, exif or etc..) */ break; } } } /*-----------------------------------------------------------------------*/ /* Start to decompress the JPEG picture */ /*-----------------------------------------------------------------------*/ TJpgD::JRESULT TJpgD::decomp ( uint32_t (*outfunc)(TJpgD*, void*, TJpgD::JRECT*), /* RGB output function */ uint32_t (*linefunc)(TJpgD*,uint32_t,uint32_t), uint32_t lineskip /* linefunc skip number */ ) { uint16_t x, y, mx, my; uint16_t rst, rsc; TJpgD::JRESULT rc; uint8_t workbuf[768]; uint8_t mcubuf[384]; uint8_t yidx = 0; bayer = (bayer + 1) & 7; mx = msx * 8; my = msy * 8; /* Size of the MCU (pixel) */ uint16_t lasty = ((height - 1) / my) * my; dcv[2] = dcv[1] = dcv[0] = 0; /* Initialize DC values */ rst = rsc = 0; rc = TJpgD::JDR_OK; for (y = 0; y < height; y += my) { /* Vertical loop of MCUs */ for (x = 0; x < width; x += mx) { /* Horizontal loop of MCUs */ if (nrst && rst++ == nrst) { /* Process restart interval if enabled */ rc = restart(this, rsc++); if (rc != TJpgD::JDR_OK) return rc; rst = 1; } rc = mcu_load(this, mcubuf, (int32_t*)workbuf); /* Load an MCU (decompress huffman coded stream and apply IDCT) */ if (rc != TJpgD::JDR_OK) return rc; rc = mcu_output(this, mcubuf, (uint8_t*)workbuf, outfunc, x, y); /* Output the MCU (color space conversion, scaling and output) */ if (rc != TJpgD::JDR_OK) return rc; } if (linefunc && (yidx == lineskip || y == lasty)) { linefunc(this, y - yidx * my, yidx * my + ((height < y + my) ? height - y : my)); yidx = 0; } else { ++yidx; } } return rc; } typedef struct { uint8_t* mcubuf = NULL; uint_fast16_t x = 0; uint_fast16_t y = 0; uint_fast8_t h = 0; volatile uint_fast8_t queue = false; } queue_t; typedef struct { TJpgD* jd; uint32_t (*outfunc)(TJpgD*, void*, TJpgD::JRECT*); uint32_t (*linefunc)(TJpgD*,uint32_t,uint32_t); QueueHandle_t sem; TaskHandle_t task; } param_task_output; static constexpr uint_fast8_t queue_max = 20; static param_task_output param; static uint8_t mcubufs[queue_max + 1][384]; static queue_t qwrites[queue_max]; static queue_t qline; static uint_fast8_t qidx = 0; static uint_fast8_t mcuidx = 0; static void task_output(void* arg) { uint8_t workbuf[768]; param_task_output* p = (param_task_output*)arg; queue_t* q; //Serial.println("task_output start"); for (;;) { if (!xQueueReceive(p->sem, &q, portMAX_DELAY)) continue; if (!q) break; //Serial.printf("task work: X=%d,Y=%d\r\n",q->x,q->y); if (q->h == 0) { mcu_output(p->jd, q->mcubuf, workbuf, p->outfunc, q->x, q->y); } else { p->linefunc(p->jd, q->y, q->h); } q->queue = false; //Serial.println("task work done"); } vQueueDelete(p->sem); //Serial.println("task_output end"); vTaskDelete(NULL); } void TJpgD::multitask_begin () { param.sem = xQueueCreate(queue_max + 1, sizeof(queue_t*)); xTaskCreatePinnedToCore(task_output, "task_output", 1600, ¶m, 1, ¶m.task, 0); } void TJpgD::multitask_end () { queue_t* q = NULL; xQueueSend(param.sem, &q, 0); vTaskDelay(10); } TJpgD::JRESULT TJpgD::decomp_multitask ( uint32_t (*outfunc)(TJpgD*, void*, TJpgD::JRECT*), /* RGB output function */ uint32_t (*linefunc)(TJpgD*,uint32_t,uint32_t), uint32_t lineskip /* linefunc skip number */ ) { uint_fast16_t x, y, mx, my; uint_fast16_t rst, rsc; TJpgD::JRESULT rc; uint8_t workbuf[768]; uint_fast16_t yidx = 0; bayer = (bayer + 1) & 7; param.jd = this; param.outfunc = outfunc; param.linefunc = linefunc; queue_t* q = &qwrites[qidx]; queue_t* ql = &qline; queue_t* qtmp = NULL; mx = msx * 8; my = msy * 8; /* Size of the MCU (pixel) */ dcv[2] = dcv[1] = dcv[0] = 0; /* Initialize DC values */ rst = rsc = 0; uint_fast16_t lasty = ((height - 1) / my) * my; rc = TJpgD::JDR_OK; y = 0; do { /* Vertical loop of MCUs */ x = 0; do { /* Horizontal loop of MCUs */ if (nrst && rst++ == nrst) { /* Process restart interval if enabled */ rc = restart(this, rsc++); if (rc != TJpgD::JDR_OK) break; rst = 1; } rc = mcu_load(this, mcubufs[mcuidx], (int32_t*)workbuf); if (rc != TJpgD::JDR_OK) break; if (!q->queue) { //mcubufs[mcuidx][0] = 0; //mcubufs[mcuidx][1] = 0; q->mcubuf = mcubufs[mcuidx]; q->x = x; q->y = y; q->queue = true; xQueueSend(param.sem, &q, 0); mcuidx = (1 + mcuidx) % (queue_max + 1); qidx = (1 + qidx) % queue_max; q = &qwrites[qidx]; } else { while (ql->queue) taskYIELD(); //mcubufs[mcuidx][0] = 0xFF; //mcubufs[mcuidx][1] = 0xFF; rc = mcu_output(this, mcubufs[mcuidx], workbuf, outfunc, x, y); } } while ((x += mx) < width); if (rc != TJpgD::JDR_OK) break; if (linefunc && (yidx == lineskip || y == lasty)) { while (ql->queue) taskYIELD(); while (xQueueReceive(param.sem, &qtmp, 0)) { //qtmp->mcubuf[0] = 0xFF; //qtmp->mcubuf[1] = 0xFF; mcu_output(this, qtmp->mcubuf, workbuf, outfunc, qtmp->x, qtmp->y); qtmp->queue = false; } ql->h = (y == lasty) ? (yidx * my + height - y) : ((lineskip + 1) * my); ql->y = y - yidx * my; ql->queue = true; xQueueSend(param.sem, &ql, 0); yidx = 0; } else { ++yidx; } } while ((y += my) < height); return rc; }
tjpgdClass.h
/*----------------------------------------------------------------------------/ / TJpgDec - Tiny JPEG Decompressor include file (C)ChaN, 2019 /-----------------------------------------------------------------------------/ / modify by lovyan03 / May 29, 2019 Tweak for ArduinoESP32 /----------------------------------------------------------------------------*/ #ifndef _TJPGDEC_H_ #define _TJPGDEC_H_ /*---------------------------------------------------------------------------*/ /* System Configurations */ #define TJPGD_SZBUF 1426 /* Size of stream input buffer */ #define JD_FORMAT 0 /* Output pixel format 0:RGB888 (3 BYTE/pix), 1:RGB565 (1 WORD/pix) */ #define JD_TBLCLIP 0 /* Use table for saturation (might be a bit faster but increases 1K bytes of code size) */ /*---------------------------------------------------------------------------*/ #if defined(_WIN32) /* Main development platform */ typedef unsigned char uint8_t; typedef unsigned short uint16_t; typedef short int16_t; typedef unsigned long uint32_t; typedef long int32_t; #else #include "stdint.h" #endif /* Decompressor object structure */ typedef struct TJpgD TJpgD; struct TJpgD { /* Error code */ typedef enum { JDR_OK = 0, /* 0: Succeeded */ JDR_INTR, /* 1: Interrupted by output function */ JDR_INP, /* 2: Device error or wrong termination of input stream */ JDR_MEM1, /* 3: Insufficient memory pool for the image */ JDR_MEM2, /* 4: Insufficient stream input buffer */ JDR_PAR, /* 5: Parameter error */ JDR_FMT1, /* 6: Data format error (may be damaged data) */ JDR_FMT2, /* 7: Right format but not supported */ JDR_FMT3 /* 8: Not supported JPEG standard */ } JRESULT; /* Rectangular structure */ typedef struct { int_fast16_t left, right, top, bottom; } JRECT; uint8_t* dptr; /* Current data read ptr */ uint8_t* dpend; /* data end ptr */ uint8_t* inbuf; /* Bit stream input buffer */ uint_fast8_t dmsk; /* Current bit in the current read byte */ uint_fast8_t bayer; /* Output bayer gain */ uint_fast8_t msx, msy; /* MCU size in unit of block (width, height) */ uint_fast8_t qtid[3]; /* Quantization table ID of each component */ int_fast16_t dcv[3]; /* Previous DC element of each component */ uint_fast16_t nrst; /* Restart inverval */ int32_t width, height; /* Size of the input image (pixel) */ uint8_t* huffbits[2][2]; /* Huffman bit distribution tables [id][dcac] */ uint_fast16_t* huffcode[2][2]; /* Huffman code word tables [id][dcac] */ uint8_t* huffdata[2][2]; /* Huffman decoded data tables [id][dcac] */ int32_t* qttbl[4]; /* Dequantizer tables [id] */ void* pool; /* Pointer to available memory pool */ uint_fast16_t sz_pool; /* Size of momory pool (bytes available) */ uint32_t (*infunc)(TJpgD*, uint8_t*, uint32_t);/* Pointer to jpeg stream input function */ void* device; /* Pointer to I/O device identifiler for the session */ JRESULT prepare (uint32_t(*)(TJpgD*,uint8_t*,uint32_t), void*); JRESULT decomp (uint32_t(*)(TJpgD*,void*,JRECT*), uint32_t(*)(TJpgD*,uint32_t,uint32_t) = 0, uint32_t = 0); JRESULT decomp_multitask (uint32_t(*)(TJpgD*,void*,JRECT*), uint32_t(*)(TJpgD*,uint32_t,uint32_t) = 0, uint32_t = 0); static void multitask_begin (); static void multitask_end (); }; #endif /* _TJPGDEC */
如果没有找到这个参考工程的话，直接复制这里的代码也是可以的
在这里需要修改MjpegClass.H文件，让他使用TFTe_SPI库
A：把库头文件更换为TFTe_SPI库
B：setup函数的传入参数tft 更改为TFT_eSPI类型，然后下面的使用耶做相应的修改。
C：jpgWriteRow函数里面，写数据入TFTlcd使用下面这个TFTe_SPI库里面的函数。
D：tft变量的声明中变量类型也要修改一下
3，实现视频播放首先定义一些东西，如下所示。
/******播放视频需要*******/ #define MJPEG_FILENAME "/movie/pikachu-dance_240x240_20fps.mjpeg" #define MJPEG_BUFFER_SIZE (220 * 176 * 2 / 4) #include "MjpegClass.h" static MjpegClass mjpeg;
然后播放视频，代码如下，与参考工程的基本差不多，只是由于我在LVGL初始化的时候已经初始化过屏幕，所以不需要在初始化
/******播放视频*******/ void videoplay(){ // gfx->begin(); // gfx->fillScreen(BLACK); delay(600); File vFile = SD.open(MJPEG_FILENAME); if (!vFile || vFile.isDirectory()) Serial.println(F("ERROR: Failed to open " MJPEG_FILENAME " file for reading")); else{ uint8_t *mjpeg_buf = (uint8_t *)malloc(MJPEG_BUFFER_SIZE); if (!mjpeg_buf) Serial.println(F("mjpeg_buf malloc failed!")); else{ Serial.println(F("MJPEG video start")); mjpeg.setup(vFile, mjpeg_buf, tft, true); // Read video while(mjpeg.readMjpegBuf()) mjpeg.drawJpg();// Play video Serial.println(F("MJPEG video end")); vFile.close(); } } }
备注：
采用这种方式播放视频是兼容lvgl的，也就是在播放视频时不去刷新lv_task_handler()时，则就不会出现播放视频刷新屏幕，而lvgl也在刷新屏幕的情况，他们分开刷新屏幕，屏幕显示没有问题。
