jpeg_idct_islow_intellib(
j_decompress_ptr cinfo,
jpeg_component_info* compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf,
JDIMENSION output_col)
{
int ctr;
JCOEFPTR inptr;
Ipp16u* quantptr;
Ipp8u* wsptr;
Ipp8u workspace[DCTSIZE2];
JSAMPROW outptr;
inptr = coef_block;
quantptr = (Ipp16u*)compptr->dct_table;
wsptr = workspace;
ippiDCTQuantInv8x8LS_JPEG_16s8u_C1R(inptr,workspace,8,quantptr);
for(ctr = 0; ctr < DCTSIZE; ctr++)
{
outptr = output_buf[ctr] + output_col;
outptr[0] = wsptr[0];
outptr[1] = wsptr[1];
outptr[2] = wsptr[2];
outptr[3] = wsptr[3];
outptr[4] = wsptr[4];
outptr[5] = wsptr[5];
outptr[6] = wsptr[6];
outptr[7] = wsptr[7];
wsptr += DCTSIZE; /* advance pointer to next row */
}
return;
} /* jpeg_idct_islow_intellib() */
int
jpeg_decompress_8u_rgb_IPP (const uint8_t * src, int src_size,
uint8_t * dest, int width, int height, int stride)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
struct jpeg_source_mgr jsrc;
cinfo.err = jpeg_std_error (&jerr);
jpeg_create_decompress (&cinfo);
jsrc.next_input_byte = src;
jsrc.bytes_in_buffer = src_size;
jsrc.init_source = init_source;
jsrc.fill_input_buffer = fill_input_buffer;
jsrc.skip_input_data = skip_input_data;
jsrc.resync_to_restart = jpeg_resync_to_restart;
jsrc.term_source = term_source;
cinfo.src = &jsrc;
jpeg_read_header (&cinfo, TRUE);
cinfo.out_color_space = JCS_RGB;
jpeg_calc_output_dimensions (&cinfo);
if (cinfo.output_height < height || cinfo.output_width < width) {
fprintf (stderr, "Error: Buffer is %dx%d but JPEG image is %dx%d\n",
width, height, cinfo.output_width, cinfo.output_height);
jpeg_destroy_decompress (&cinfo);
return -1;
}
jvirt_barray_ptr * dct_planes = jpeg_read_coefficients (&cinfo);
uint8_t * tmp_plane = NULL;
uint8_t * full_plane[cinfo.num_components];
int full_stride;
int tmp_stride;
int max_h_samp=1, max_v_samp=1;
int c, i, j;
jpeg_component_info * c0 = cinfo.cur_comp_info[0];
for (c = 0; c < cinfo.num_components; c++) {
full_plane[c] = ippiMalloc_8u_C1 (c0->width_in_blocks*8,
c0->height_in_blocks*8, &full_stride);
jpeg_component_info * comp = cinfo.cur_comp_info[c];
if (comp->h_samp_factor > max_h_samp)
max_h_samp = comp->h_samp_factor;
if (comp->v_samp_factor > max_v_samp)
max_v_samp = comp->v_samp_factor;
}
for (c = 0; c < cinfo.num_components; c++) {
jpeg_component_info * comp = cinfo.cur_comp_info[c];
uint8_t * plane;
int pstride, offset;
int h_samp = max_h_samp / comp->h_samp_factor;
int v_samp = max_v_samp / comp->v_samp_factor;
if (h_samp == 2 && v_samp == 2) {
if (!tmp_plane)
tmp_plane = ippiMalloc_8u_C1 (comp->width_in_blocks*8 + 16,
comp->height_in_blocks*8 + 2, &tmp_stride);
plane = tmp_plane;
pstride = tmp_stride;
offset = tmp_stride + 8;
}
else if (h_samp == 1 && v_samp == 1) {
plane = full_plane[c];
pstride = full_stride;
offset = 0;
}
for (i = 0; i < comp->height_in_blocks; i++) {
JBLOCKARRAY bar = cinfo.mem->access_virt_barray (
(j_common_ptr) &cinfo, dct_planes[c],
i, 1, FALSE);
JBLOCKROW row = bar[0];
uint8_t * drow = plane + 8*i*pstride + offset;
for (j = 0; j < comp->width_in_blocks; j++) {
JBLOCK * blk = row + j;
ippiDCTQuantInv8x8LS_JPEG_16s8u_C1R (*blk, drow + j*8,
pstride,
cinfo.quant_tbl_ptrs[comp->quant_tbl_no]->quantval);
}
}
if (h_samp == 2 && v_samp == 2) {
IppiSize srcroi = { 8*comp->width_in_blocks,
8*comp->height_in_blocks };
IppiSize dstroi = { 8*comp->width_in_blocks + 2,
8*comp->height_in_blocks + 2 };
ippiCopyReplicateBorder_8u_C1IR (tmp_plane + tmp_stride + 8,
tmp_stride, srcroi, dstroi, 1, 1);
dstroi.width = width;
dstroi.height = height;
ippiSampleUpH2V2_JPEG_8u_C1R (tmp_plane + tmp_stride + 8,
tmp_stride, srcroi, full_plane[c], full_stride, dstroi);
}
}
IppiSize dstroi = { width, height };
ippiYCbCrToRGB_JPEG_8u_P3C3R ((const uint8_t **)full_plane,
full_stride, dest, stride, dstroi);
for (c = 0; c < cinfo.num_components; c++)
ippiFree (full_plane[c]);
if (tmp_plane)
ippiFree (tmp_plane);
jpeg_finish_decompress (&cinfo);
jpeg_destroy_decompress (&cinfo);
return 0;
}
