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cine-extract.c
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cine-extract.c
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/*
* cine-extract.c -- extract one or more images from a CINE file.
*
* part of vrptools -- https://github.com/lindes/vrptools
*
* Copyright 2011, 2013 by David Lindes. All rights reserved.
*
* Available under terms in the LICENSE file that should accompany
* this file. Please consider that file to be included herein by
* reference.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <assert.h>
#include "vrptools.h"
#include "util.h"
/* extract_image_by_offset - extract the numbered image into a buffer
*
* input parameters:
* handle - handle to opened VRP Cine file
* offset - offset of image we want to extract
*
* output parameters:
* rows_out - storage location to store number of rows extracted
* cols_out - " " " " " " cols "
* outbuf_out - optional buffer; contract:
* if a NULL pointer is passed, it will be allocated;
* may be re-used, when doing multiple calls;
* Caller's responsibility to free it when done.
*
* side effects:
* allocates memory for outbuf_out, if null pointer passed
*/
void extract_image_by_offset(VRP_Handle handle, int offset,
int *rows_out, int *cols_out,
uint16_t **outbuf_out)
{
VRP_ImageOffset *theImagePointer;
VRP_ImageAnnotation *theAnnotation;
VRP_ImageData *theImage;
VRP_WORD *pixelData;
int i, j, row, col, rows, cols;
int left, right, top, bottom;
int bufsiz;
uint16_t *outbuf;
float wb_b, wb_r;
struct _ppm_pixel {
VRP_WORD r;
VRP_WORD g;
VRP_WORD b;
} pixel;
if (handle->header->Compression != VRP_CC_UNINT)
{
fprintf(stderr, "Woah, sorry, don't (yet) know how to handle Compression type %d\n",
handle->header->Compression);
return;
}
if (handle->setup->CFA != VRP_CFA_BAYER)
{
fprintf(stderr, "Woah, sorry, don't (yet) know how to handle CFA type %d\n", handle->setup->CFA);
return;
}
theImagePointer = handle->firstImageOffset + offset;
theAnnotation = handle->start + *theImagePointer;
theImage = handle->start + *theImagePointer + theAnnotation->AnnotationSize - sizeof(VRP_DWORD);
pixelData = handle->start + *theImagePointer + theAnnotation->AnnotationSize;
rows = handle->imageHeader->biHeight;
cols = handle->imageHeader->biWidth;
bufsiz = 3*rows*cols;
wb_r = handle->setup->WBGain[0].R;
wb_b = handle->setup->WBGain[0].B;
assert(outbuf_out);
outbuf = *outbuf_out;
if (!outbuf)
{
outbuf=calloc(bufsiz, sizeof(*outbuf));
if (!outbuf)
{
perror("calloc");
return;
}
*outbuf_out = outbuf;
}
*rows_out = rows;
*cols_out = cols;
/* go through rows backwards, to convert bottom-up format to top-down: */
for (i = rows - 1; i >= 0; --i)
{
row = rows - i - 1;
/* columns go in regular (left-to-right) order: */
for (j = 0; j < cols; ++j)
{
col = j;
/* XXX very naive and simple demosaicing right now */
/* TODO: find a better algorithm; see http://en.wikipedia.org/wiki/Demosaicing */
left = 2*(col/2);
right = left+1;
top = 2*(row/2);
bottom = top + 1;
switch((row % 2) << 1 | col % 2)
{
case 0: /* bottom-left: red */
pixel.r = pixelData[row*cols+col]; /* real */
pixel.g = pixelData[row*cols+col+1]; /* from the right */
pixel.b = pixelData[(row+1)*cols+col+1]; /* from above, right */
break;
case 1: /* bottom-right: green */
pixel.r = pixelData[row*cols+col-1]; /* from the left */
pixel.g = pixelData[row*cols+col]; /* real value */
pixel.b = pixelData[(row+1)*cols+col]; /* from above */
break;
case 2: /* top-left: green */
pixel.r = pixelData[(row-1)*cols+col]; /* from below */
pixel.g = pixelData[row*cols+col]; /* real value */
pixel.b = pixelData[row*cols+col+1]; /* from the right */
break;
case 3: /* top-right: blue */
pixel.r = pixelData[(row-1)*cols+col-1]; /* from below, left */
pixel.g = pixelData[row*cols+col-1]; /* from the left */
pixel.b = pixelData[row*cols+col]; /* real value */
break;
}
/* adjust white balance */
pixel.r = wb_r * pixel.r;
if (pixel.r >= handle->imageHeader->biClrImportant)
pixel.r = handle->imageHeader->biClrImportant - 1;
pixel.b = wb_b * pixel.b;
if (pixel.b >= handle->imageHeader->biClrImportant)
pixel.b = handle->imageHeader->biClrImportant - 1;
/* prepare to store -- using network byte order (big-endian) */
pixel.r = htons(pixel.r);
pixel.g = htons(pixel.g);
pixel.b = htons(pixel.b);
outbuf[3*(i*cols+j)+0] = pixel.r;
outbuf[3*(i*cols+j)+1] = pixel.g;
outbuf[3*(i*cols+j)+2] = pixel.b;
}
}
}
/*
* extract_to_ppm_dir - extract a sequence of PPM images into outdir
* inputs:
* handle - VRP cine file handle
* outdir - directory in which to place files (must already exist)
*
* outputs:
* none (see side effects)
*
* side effects:
* creates and/or over-writes files in outdir
*/
void extract_to_ppm_dir(VRP_Handle handle, const char *outdir)
{
unsigned int j;
/* by default, all frames, 1 at a time */
/* TODO: make these command-line args */
int first = 0, increment = 1;
uint16_t *outbuf = NULL;
int rows, cols;
if (first < 0)
first = 0;
for (j = first; j < handle->header->ImageCount; j += increment)
{
char filename[BUFSIZ];
FILE *outfile;
sprintf(filename, "%s/img-%05u.ppm", outdir, j);
fprintf(stderr, "Extracting image at offset %d into %s\n", j, filename);
if (!(outfile = fopen(filename, "wb")))
{
perror(filename);
return;
}
extract_image_by_offset(handle, j, &rows, &cols, &outbuf);
fprintf(outfile, "P6\n%d %d\n%d\n", cols, rows, handle->imageHeader->biClrImportant);
fwrite(outbuf, sizeof(short), 3*cols*rows, outfile);
fclose(outfile);
}
if (outbuf)
free(outbuf);
}
/* offset_for_frame_id - return offset for a numbered frame
* inputs:
* handle - handle to VRP Cine file
* frame - frame number, in Cine reckoning
*
* return value:
* zero-based offset of the identified frame (-1 means invalid frame number)
*
* side-effects:
* none, unless frame is out of bounds in Cine file
*/
int extract_image_by_frame_id(VRP_Handle handle, int frame)
{
int offset, last;
offset = frame - handle->header->FirstImageNo;
last = handle->header->FirstImageNo + handle->header->ImageCount;
if (offset < 0 || (unsigned)offset > handle->header->ImageCount)
{
fprintf(stderr, "Asking for frame %d, which is outside of range %d -> %d\n",
frame, handle->header->FirstImageNo, last);
return -1;
}
return offset;
}
/* main - main program for cine-extract
*/
int main(int argc, char *argv[])
{
int i;
const char *outdir = "cine-extract.d";
for (i = 1; i < argc; ++i)
{
VRP_Handle handle;
int first, trigger, last;
if (!strcmp(argv[i], "-d"))
{
i ++;
outdir = argv[i];
if (!outdir)
{
fprintf(stderr, "Directory name must follow -d option\n");
exit(1);
}
continue;
}
fprintf(stderr, "--=> reading %s <=--\n", argv[i]);
if (!(handle = read_cine(argv[i])))
{
fprintf(stderr, "Failed to get handle on %s\n", argv[i]);
continue;
}
if ((first = handle->header->FirstImageNo) > 0)
{
fprintf(stderr, "Sorry, trigger frame is not saved in this file (starts with frame %d).\n", first);
}
/* the offset of the frame we actually want: */
trigger = 0;
last = handle->header->ImageCount + first;
if (trigger < first)
{
fprintf(stderr, "NOTICE: trigger frame 0 not in range %d -> %d, setting to %d\n", first, last, first);
trigger = first;
}
else if (trigger > last)
{
fprintf(stderr, "NOTICE: trigger frame 0 not in range %d -> %d, setting to %d\n", first, last, last);
trigger = last;
}
fprintf(stderr, "DEBUG: first = %d, trig = %d, last = %d\n", first, trigger, last);
fprintf(stderr, "Capturing the %d%s frame (frame #0 out of %d through %d)\n", trigger+1,
ordinal_suffix(trigger+1), first, last);
extract_to_ppm_dir(handle, outdir);
free_cine_handle(handle);
}
return(0);
}