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dwebp: change -yuv option to -raw

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change the layout to IMC2

This is easier visually
(cf http://www.fourcc.org/yuv.php#IMC2)

Change-Id: I8e8495908f98a392bf629d41f14eb7835ba027e1
This commit is contained in:
Pascal Massimino 2010-12-17 05:53:50 -08:00
parent d72180a489
commit e12109eefc
1 changed files with 30 additions and 16 deletions
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46
examples/dwebp.c
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@ -27,13 +27,16 @@ extern "C" {
static void help(const char *s) { static void help(const char *s) {
printf("Usage: dwebp " printf("Usage: dwebp "
"[options] [in_file] [-h] [-yuv] [-o ppm_file]\n"); "[options] [in_file] [-h] [-raw] [-o ppm_file]\n\n"
" -raw: save the raw YUV samples as a grayscale PGM\n"
" file with IMC2 layout.\n"
);
} }
int main(int argc, char *argv[]) { int main(int argc, char *argv[]) {
const char *in_file = NULL; const char *in_file = NULL;
const char *out_file = NULL; const char *out_file = NULL;
int yuv_out = 0; int raw_output = 0;
int width, height, stride, uv_stride; int width, height, stride, uv_stride;
uint8_t* out = NULL, *u = NULL, *v = NULL; uint8_t* out = NULL, *u = NULL, *v = NULL;
@ -45,8 +48,8 @@ int main(int argc, char *argv[]) {
return 0; return 0;
} else if (!strcmp(argv[c], "-o") && c < argc - 1) { } else if (!strcmp(argv[c], "-o") && c < argc - 1) {
out_file = argv[++c]; out_file = argv[++c];
} else if (!strcmp(argv[c], "-yuv")) { } else if (!strcmp(argv[c], "-raw")) {
yuv_out = 1; raw_output = 1;
} else if (argv[c][0] == '-') { } else if (argv[c][0] == '-') {
printf("Unknown option '%s'\n", argv[c]); printf("Unknown option '%s'\n", argv[c]);
help(argv[0]); help(argv[0]);
@ -81,7 +84,7 @@ int main(int argc, char *argv[]) {
return -1; return -1;
} }
if (!yuv_out) { if (!raw_output) {
out = WebPDecodeRGB(data, data_size, &width, &height); out = WebPDecodeRGB(data, data_size, &width, &height);
} else { } else {
out = WebPDecodeYUV(data, data_size, &width, &height, out = WebPDecodeYUV(data, data_size, &width, &height,
@ -98,24 +101,35 @@ int main(int argc, char *argv[]) {
if (out_file) { if (out_file) {
FILE* const fout = fopen(out_file, "wb"); FILE* const fout = fopen(out_file, "wb");
if (fout) { if (fout) {
if (!yuv_out) { int ok = 1;
if (!raw_output) {
fprintf(fout, "P6\n%d %d\n255\n", width, height); fprintf(fout, "P6\n%d %d\n255\n", width, height);
fwrite(out, width * height, 3, fout); ok &= (fwrite(out, width * height, 3, fout) == 3);
} else { } else {
// Save a grayscale PGM file using the IMC2 layout
// (http://www.fourcc.org/yuv.php#IMC2). This is a very
// convenient format for viewing the samples, esp. for
// odd dimensions.
int y; int y;
fprintf(fout, "P5\n%d %d\n255\n", width, height * 3 / 2); const int uv_width = (width + 1) / 2;
for (y = 0; y < height; ++y) { const int uv_height = (height + 1) / 2;
fwrite(out + y * stride, width, 1, fout); const int out_stride = (width + 1) & ~1;
fprintf(fout, "P5\n%d %d\n255\n", out_stride, height + uv_height);
for (y = 0; ok && y < height; ++y) {
ok &= (fwrite(out + y * stride, width, 1, fout) == 1);
if (width & 1) fputc(0, fout); // padding byte
} }
for (y = 0; y < (height + 1) / 2; ++y) { for (y = 0; ok && y < uv_height; ++y) {
fwrite(u + y * uv_stride, (width + 1) / 2, 1, fout); ok &= (fwrite(u + y * uv_stride, uv_width, 1, fout) == 1);
} ok &= (fwrite(v + y * uv_stride, uv_width, 1, fout) == 1);
for (y = 0; y < (height + 1) / 2; ++y) {
fwrite(v + y * uv_stride, (width + 1) / 2, 1, fout);
} }
} }
fclose(fout); fclose(fout);
printf("Saved file %s\n", out_file); if (ok) {
printf("Saved file %s\n", out_file);
} else {
printf("Error writing file %s !!\n", out_file);
}
} else { } else {
printf("Error opening output file %s\n", out_file); printf("Error opening output file %s\n", out_file);
} }