int decode_scan(void)
{
#ifdef _JPEG_DEBUG
printf("%d MCUs in total.\n", iceenv.num_mcu_x * iceenv.num_mcu_y);
printf("MCU dimension: %dx%d\n", iceenv.max_samp_x << 3, iceenv.max_samp_y << 3);
#endif
// if (iceenv.scan_buffer[iceenv.buf_pos] == 0xFF && iceenv.scan_buffer[iceenv.buf_pos + 1] == 0x00)
// skip_stuff_byte = 1;
init_idct();
for (iceenv.cur_mcu_x = iceenv.cur_mcu_y = 0;;)
{
//printf("Decoding MCU [%d,%d]\n", iceenv.cur_mcu_x, iceenv.cur_mcu_y);
decode_mcu();
iceenv.cur_mcu_x++;
if (iceenv.cur_mcu_x == iceenv.num_mcu_x)
{
iceenv.cur_mcu_x = 0;
iceenv.cur_mcu_y++;
if (iceenv.cur_mcu_y == iceenv.num_mcu_y)
break;
}
if (!iceenv.restart_interval)
continue;
iceenv.rstcount--;
if (!iceenv.rstcount)
{
int err = process_rst();
if (err != ERR_OK)
return err;
}
}
//if (iceenv.cur_byte_remaining > 0)
iceenv.buf_pos++;
return ERR_OK;
}
int JPEGDecoder::read(void)
{
int y, x;
uint8 *pDst_row;
if(is_available == 0) return 0;
if (mcu_y >= image_info.m_MCUSPerCol)
{
delete pImage;
g_pInFile.close();
return 0;
}
if (reduce)
{
// In reduce mode, only the first pixel of each 8x8 block is valid.
pDst_row = pImage;
if (image_info.m_scanType == PJPG_GRAYSCALE)
{
*pDst_row = image_info.m_pMCUBufR[0];
}
else
{
uint y, x;
for (y = 0; y < col_blocks_per_mcu; y++)
{
uint src_ofs = (y * 128U);
for (x = 0; x < row_blocks_per_mcu; x++)
{
pDst_row[0] = image_info.m_pMCUBufR[src_ofs];
pDst_row[1] = image_info.m_pMCUBufG[src_ofs];
pDst_row[2] = image_info.m_pMCUBufB[src_ofs];
pDst_row += 3;
src_ofs += 64;
}
pDst_row += row_pitch - 3 * row_blocks_per_mcu;
}
}
}
else
{
// Copy MCU's pixel blocks into the destination bitmap.
pDst_row = pImage;
for (y = 0; y < image_info.m_MCUHeight; y += 8)
{
const int by_limit = min(8, image_info.m_height - (mcu_y * image_info.m_MCUHeight + y));
for (x = 0; x < image_info.m_MCUWidth; x += 8)
{
uint8 *pDst_block = pDst_row + x * image_info.m_comps;
// Compute source byte offset of the block in the decoder's MCU buffer.
uint src_ofs = (x * 8U) + (y * 16U);
const uint8 *pSrcR = image_info.m_pMCUBufR + src_ofs;
const uint8 *pSrcG = image_info.m_pMCUBufG + src_ofs;
const uint8 *pSrcB = image_info.m_pMCUBufB + src_ofs;
const int bx_limit = min(8, image_info.m_width - (mcu_x * image_info.m_MCUWidth + x));
if (image_info.m_scanType == PJPG_GRAYSCALE)
{
int bx, by;
for (by = 0; by < by_limit; by++)
{
uint8 *pDst = pDst_block;
for (bx = 0; bx < bx_limit; bx++)
*pDst++ = *pSrcR++;
pSrcR += (8 - bx_limit);
pDst_block += row_pitch;
}
}
else
{
int bx, by;
for (by = 0; by < by_limit; by++)
{
uint8 *pDst = pDst_block;
for (bx = 0; bx < bx_limit; bx++)
{
pDst[0] = *pSrcR++;
pDst[1] = *pSrcG++;
pDst[2] = *pSrcB++;
pDst += 3;
}
pSrcR += (8 - bx_limit);
pSrcG += (8 - bx_limit);
pSrcB += (8 - bx_limit);
pDst_block += row_pitch;
}
}
}
pDst_row += (row_pitch * 8);
}
}
MCUx = mcu_x;
MCUy = mcu_y;
mcu_x++;
if (mcu_x == image_info.m_MCUSPerRow)
{
mcu_x = 0;
mcu_y++;
}
if(decode_mcu()==-1) is_available = 0 ;
return 1;
}
int JPEGDecoder::decode(char* pFilename, unsigned char pReduce){
if(pReduce) reduce = pReduce;
g_pInFile = SD.open(pFilename, FILE_READ);
if (!g_pInFile)
return -1;
g_nInFileOfs = 0;
g_nInFileSize = g_pInFile.size();
status = pjpeg_decode_init(&image_info, pjpeg_callback, NULL, (unsigned char)reduce);
if (status)
{
#ifdef DEBUG
Serial.print("pjpeg_decode_init() failed with status ");
Serial.println(status);
if (status == PJPG_UNSUPPORTED_MODE)
{
Serial.println("Progressive JPEG files are not supported.");
}
#endif
g_pInFile.close();
return -1;
}
// In reduce mode output 1 pixel per 8x8 block.
decoded_width = reduce ? (image_info.m_MCUSPerRow * image_info.m_MCUWidth) / 8 : image_info.m_width;
decoded_height = reduce ? (image_info.m_MCUSPerCol * image_info.m_MCUHeight) / 8 : image_info.m_height;
row_pitch = image_info.m_MCUWidth * image_info.m_comps;
//pImage = (uint8 *)malloc(image_info.m_MCUWidth * image_info.m_MCUHeight * image_info.m_comps);
pImage = new uint8[image_info.m_MCUWidth * image_info.m_MCUHeight * image_info.m_comps];
if (!pImage)
{
g_pInFile.close();
#ifdef DEBUG
Serial.println("Memory Allocation Failure");
#endif
return -1;
}
memset(pImage , 0 , sizeof(pImage));
row_blocks_per_mcu = image_info.m_MCUWidth >> 3;
col_blocks_per_mcu = image_info.m_MCUHeight >> 3;
is_available = 1 ;
width = decoded_width;
height = decoded_height;
comps = image_info.m_comps;
MCUSPerRow = image_info.m_MCUSPerRow;
MCUSPerCol = image_info.m_MCUSPerCol;
scanType = image_info.m_scanType;
MCUWidth = image_info.m_MCUWidth;
MCUHeight = image_info.m_MCUHeight;
return decode_mcu();
}
int JPEGDecoder::decode(File pInFile, unsigned char pReduce){
if(pReduce) reduce = pReduce;
// g_pInFile = SD.open(pFilename, FILE_READ);
g_pInFile = pInFile;
if (!g_pInFile){
#ifdef DEBUG_JPEG
Serial.println("failed to open jpeg file");
#endif
return -1;
}
g_nInFileOfs = 0;
g_nInFileSize = g_pInFile.size();
#ifdef DEBUG_JPEG
Serial.print("file size = ");
Serial.println(g_nInFileSize);
#endif
status = pjpeg_decode_init(&image_info, pjpeg_callback, NULL, (unsigned char)reduce);
if (status)
{
#ifdef DEBUG_JPEG
Serial.print("ERROR : pjpeg_decode_init() : ");
/*
switch(status & 63){
case PJPG_NO_MORE_BLOCKS: Serial.print("NO_MORE_BLOCKS"); break;
case PJPG_BAD_DHT_COUNTS: Serial.print("BAD_DHT_COUNTS"); break;
case PJPG_BAD_DHT_INDEX: Serial.print("BAD_DHT_INDEX"); break;
case PJPG_BAD_DHT_MARKER: Serial.print("BAD_DHT_MARKER"); break;
case PJPG_BAD_DQT_MARKER: Serial.print("BAD_DQT_MARKER"); break;
case PJPG_BAD_DQT_TABLE: Serial.print("BAD_DQT_TABLE"); break;
case PJPG_BAD_PRECISION: Serial.print("BAD_PRECISION"); break;
case PJPG_BAD_HEIGHT: Serial.print("BAD_HEIGHT"); break;
case PJPG_BAD_WIDTH: Serial.print("BAD_WIDTH"); break;
case PJPG_TOO_MANY_COMPONENTS: Serial.print("TOO_MANY_COMPONENTS"); break;
case PJPG_BAD_SOF_LENGTH: Serial.print("BAD_SOF_LENGTH"); break;
case PJPG_BAD_VARIABLE_MARKER: Serial.print("BAD_VARIABLE_MARKER"); break;
case PJPG_BAD_DRI_LENGTH: Serial.print("BAD_DRI_LENGTH"); break;
case PJPG_BAD_SOS_LENGTH: Serial.print("BAD_SOS_LENGTH"); break;
case PJPG_BAD_SOS_COMP_ID: Serial.print("BAD_SOS_COMP_ID"); break;
case PJPG_W_EXTRA_BYTES_BEFORE_MARKER: Serial.print("W_EXTRA_BYTES"); break;
case PJPG_NO_ARITHMITIC_SUPPORT: Serial.print("ARITHMITIC"); break;
case PJPG_UNEXPECTED_MARKER: Serial.print("UNEXPECTED_MARKER"); break;
case PJPG_NOT_JPEG: Serial.print("NOT_JPEG"); break;
case PJPG_UNSUPPORTED_MARKER: Serial.print("UNSUPPORTED_MARKER"); break;
case PJPG_BAD_DQT_LENGTH: Serial.print("BAD_DQT_LENGTH"); break;
case PJPG_TOO_MANY_BLOCKS: Serial.print("TOO_MANY_BLOCKS"); break;
case PJPG_UNDEFINED_QUANT_TABLE: Serial.print("QUANT_TABLE"); break;
case PJPG_UNDEFINED_HUFF_TABLE: Serial.print("HUFF_TABLE"); break;
case PJPG_NOT_SINGLE_SCAN: Serial.print("SINGLE_SCAN"); break;
case PJPG_UNSUPPORTED_COLORSPACE: Serial.print("COLORSPACE"); break;
case PJPG_UNSUPPORTED_SAMP_FACTORS: Serial.print("SAMP_FACTORS"); break;
case PJPG_DECODE_ERROR: Serial.print("DECODE_ERROR"); break;
case PJPG_BAD_RESTART_MARKER: Serial.print("RESTART_MARKER"); break;
case PJPG_ASSERTION_ERROR: Serial.print("ASSERTION"); break;
case PJPG_BAD_SOS_SPECTRAL: Serial.print("SOS_SPECTRAL"); break;
case PJPG_BAD_SOS_SUCCESSIVE: Serial.print("SOS_SUCCESSIVE"); break;
case PJPG_STREAM_READ_ERROR: Serial.print("STREAM_READ_ERRO"); break;
case PJPG_NOTENOUGHMEM: Serial.print("NOTENOUGHMEM"); break;
case PJPG_UNSUPPORTED_COMP_IDENT: Serial.print("COMP_IDENT"); break;
case PJPG_UNSUPPORTED_QUANT_TABLE: Serial.print("QUANT_TABLE"); break;
case PJPG_UNSUPPORTED_MODE: Serial.print("progressive JPEG"); break;
default:
Serial.print("Unknown");
break;
}
*/
Serial.print(' ');
Serial.print(status);
Serial.print(' ');
Serial.println(status,BIN);
#endif
g_pInFile.close();
return -1;
}
#ifdef DEBUG_JPEG
Serial.print("Width :");
Serial.println(image_info.m_width);
Serial.print("Height :");
Serial.println(image_info.m_height);
Serial.print("Components:");
Serial.println(image_info.m_comps);
Serial.print("MCU / row :");
Serial.println(image_info.m_MCUSPerRow);
Serial.print("MCU / col :");
Serial.println(image_info.m_MCUSPerCol);
Serial.print("Scan type :");
Serial.println(image_info.m_scanType);
Serial.print("MCU width :");
Serial.println(image_info.m_MCUWidth);
Serial.print("MCU height:");
Serial.println(image_info.m_MCUHeight);
Serial.println("");
#endif
// In reduce mode output 1 pixel per 8x8 block.
decoded_width = reduce ? (image_info.m_MCUSPerRow * image_info.m_MCUWidth) / 8 : image_info.m_width;
decoded_height = reduce ? (image_info.m_MCUSPerCol * image_info.m_MCUHeight) / 8 : image_info.m_height;
row_pitch = image_info.m_MCUWidth * image_info.m_comps;
//pImage = (uint8 *)malloc(image_info.m_MCUWidth * image_info.m_MCUHeight * image_info.m_comps);
pImage = new uint8[image_info.m_MCUWidth * image_info.m_MCUHeight * image_info.m_comps];
if (!pImage)
{
g_pInFile.close();
#ifdef DEBUG_JPEG
Serial.println("Memory Allocation Failure");
#endif
return -1;
}
// memset(pImage , 0 , sizeof(pImage));
memset(pImage , 0 , image_info.m_MCUWidth * image_info.m_MCUHeight * image_info.m_comps);
row_blocks_per_mcu = image_info.m_MCUWidth >> 3;
col_blocks_per_mcu = image_info.m_MCUHeight >> 3;
is_available = 1 ;
width = decoded_width;
height = decoded_height;
comps = image_info.m_comps;
MCUSPerRow = image_info.m_MCUSPerRow;
MCUSPerCol = image_info.m_MCUSPerCol;
scanType = image_info.m_scanType;
MCUWidth = image_info.m_MCUWidth;
MCUHeight = image_info.m_MCUHeight;
return decode_mcu();
}
