使用libjpeg 压缩yuv420到jpg (内存方式)
#include <Windows.h>
#include <stdio.h>
extern "C" {
#include <jpeglib.h>
}
#define WIDTH 352
#define HEIGHT 288
#define QUALITY 80
#define BUFFER_SZIE (WIDTH*HEIGHT*2)
/* The following declarations and 5 functions are jpeg related
* functions used by put_jpeg_grey_memory and put_jpeg_yuv420p_memory
*/
typedef struct {
struct jpeg_destination_mgr pub;
JOCTET *buf;
size_t bufsize;
size_t jpegsize;
} mem_destination_mgr;
typedef mem_destination_mgr *mem_dest_ptr;
METHODDEF(void) init_destination(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
dest->pub.next_output_byte = dest->buf;
dest->pub.free_in_buffer = dest->bufsize;
dest->jpegsize = ;
}
METHODDEF(boolean) empty_output_buffer(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
dest->pub.next_output_byte = dest->buf;
dest->pub.free_in_buffer = dest->bufsize;
return FALSE;
}
METHODDEF(void) term_destination(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
dest->jpegsize = dest->bufsize - dest->pub.free_in_buffer;
}
static GLOBAL(void) jpeg_mem_dest(j_compress_ptr cinfo, JOCTET* buf, size_t bufsize)
{
mem_dest_ptr dest;
if (cinfo->dest == NULL) {
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small)((j_common_ptr)cinfo, JPOOL_PERMANENT,
sizeof(mem_destination_mgr));
}
dest = (mem_dest_ptr) cinfo->dest;
dest->pub.init_destination = init_destination;
dest->pub.empty_output_buffer = empty_output_buffer;
dest->pub.term_destination = term_destination;
dest->buf = buf;
dest->bufsize = bufsize;
dest->jpegsize = ;
}
static GLOBAL(int) jpeg_mem_size(j_compress_ptr cinfo)
{
mem_dest_ptr dest = (mem_dest_ptr) cinfo->dest;
return dest->jpegsize;
}
/* put_jpeg_yuv420p_memory converts an input image in the YUV420P format into a jpeg image and puts
* it in a memory buffer.
* Inputs:
* - input_image is the image in YUV420P format.
* - width and height are the dimensions of the image
* Output:
* - dest_image is a pointer to the jpeg image buffer
* Returns buffer size of jpeg image
*/
static int put_jpeg_yuv420p_memory(unsigned char *dest_image,
unsigned char *input_image, int width, int height)
{
int i, j, jpeg_image_size;
JSAMPROW y[],cb[],cr[]; // y[2][5] = color sample of row 2 and pixel column 5; (one plane)
JSAMPARRAY data[]; // t[0][2][5] = color sample 0 of row 2 and column 5
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
data[] = y;
data[] = cb;
data[] = cr;
cinfo.err = jpeg_std_error(&jerr); // errors get written to stderr
jpeg_create_compress(&cinfo);
cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = ;
jpeg_set_defaults (&cinfo);
jpeg_set_colorspace(&cinfo, JCS_YCbCr);
cinfo.raw_data_in = TRUE; // supply downsampled data
cinfo.do_fancy_downsampling = FALSE; // fix segfaulst with v7
cinfo.comp_info[].h_samp_factor = ;
cinfo.comp_info[].v_samp_factor = ;
cinfo.comp_info[].h_samp_factor = ;
cinfo.comp_info[].v_samp_factor = ;
cinfo.comp_info[].h_samp_factor = ;
cinfo.comp_info[].v_samp_factor = ;
jpeg_set_quality(&cinfo, QUALITY, TRUE);
cinfo.dct_method = JDCT_FASTEST;
jpeg_mem_dest(&cinfo, dest_image, BUFFER_SZIE); // data written to mem
jpeg_start_compress (&cinfo, TRUE);
; j < height; j += ) {
; i < ; i++) {
y[i] = input_image + width * (i + j);
== ) {
cb[i/] = input_image + width * height + width / * ((i + j) / );
cr[i/] = input_image + width * height + width * height / + width / * ((i + j) / );
}
}
jpeg_write_raw_data(&cinfo, data, );
}
jpeg_finish_compress(&cinfo);
jpeg_image_size = jpeg_mem_size(&cinfo);
jpeg_destroy_compress(&cinfo);
return jpeg_image_size;
}
int main( int argc, TCHAR * argv[], TCHAR * envp[] )
{
HANDLE fyuv,fyuvjpg;
BYTE *pSrc ,*pDst;
LONG lSize = ;
DWORD readsize;
DWORD writesize;
pSrc = new BYTE[BUFFER_SZIE];
fyuv = CreateFile(L, NULL, OPEN_EXISTING, , NULL);
ReadFile(fyuv , pSrc ,BUFFER_SZIE ,&readsize,NULL);
pDst = new BYTE[BUFFER_SZIE];
lSize = put_jpeg_yuv420p_memory(pDst,pSrc , WIDTH ,HEIGHT);
fyuvjpg = CreateFile(L, NULL, CREATE_ALWAYS, , NULL);
WriteFile(fyuvjpg, pDst, lSize, &writesize, NULL);
CloseHandle(fyuv);
CloseHandle(fyuvjpg);
;
}
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