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- #include <string.h>
- #include "tiny-nv12-scale.h"
- /* TODO: optimize this stuff later, or replace with something better. it's
- * kind of garbage. although normally it shouldn't be called that often. plus
- * it's nearest neighbor so not really a huge deal. at the very least it
- * should be sse2 at some point. */
- void nv12_scale_init(nv12_scale_t *s, enum target_format format, int dst_cx, int dst_cy, int src_cx, int src_cy)
- {
- s->format = format;
- s->src_cx = src_cx;
- s->src_cy = src_cy;
- s->dst_cx = dst_cx;
- s->dst_cy = dst_cy;
- }
- static void nv12_scale_nearest(nv12_scale_t *s, uint8_t *dst_start, const uint8_t *src)
- {
- register uint8_t *dst = dst_start;
- const int src_cx = s->src_cx;
- const int src_cy = s->src_cy;
- const int dst_cx = s->dst_cx;
- const int dst_cy = s->dst_cy;
- /* lum */
- for (int y = 0; y < dst_cy; y++) {
- const int src_line = y * src_cy / dst_cy * s->src_cx;
- for (int x = 0; x < dst_cx; x++) {
- const int src_x = x * src_cx / dst_cx;
- *(dst++) = src[src_line + src_x];
- }
- }
- src += src_cx * src_cy;
- /* uv */
- const int dst_cx_d2 = dst_cx / 2;
- const int dst_cy_d2 = dst_cy / 2;
- for (int y = 0; y < dst_cy_d2; y++) {
- const int src_line = y * src_cy / dst_cy * src_cx;
- for (int x = 0; x < dst_cx_d2; x++) {
- const int src_x = x * src_cx / dst_cx * 2;
- const int pos = src_line + src_x;
- *(dst++) = src[pos];
- *(dst++) = src[pos + 1];
- }
- }
- }
- static void nv12_scale_nearest_to_i420(nv12_scale_t *s, uint8_t *dst_start, const uint8_t *src)
- {
- register uint8_t *dst = dst_start;
- const int src_cx = s->src_cx;
- const int src_cy = s->src_cy;
- const int dst_cx = s->dst_cx;
- const int dst_cy = s->dst_cy;
- const int size = src_cx * src_cy;
- /* lum */
- for (int y = 0; y < dst_cy; y++) {
- const int src_line = y * src_cy / dst_cy * s->src_cx;
- for (int x = 0; x < dst_cx; x++) {
- const int src_x = x * src_cx / dst_cx;
- *(dst++) = src[src_line + src_x];
- }
- }
- src += size;
- /* uv */
- const int dst_cx_d2 = dst_cx / 2;
- const int dst_cy_d2 = dst_cy / 2;
- register uint8_t *dst2 = dst + dst_cx * dst_cy / 4;
- for (int y = 0; y < dst_cy_d2; y++) {
- const int src_line = y * src_cy / dst_cy * src_cx;
- for (int x = 0; x < dst_cx_d2; x++) {
- const int src_x = x * src_cx / dst_cx * 2;
- const int pos = src_line + src_x;
- *(dst++) = src[pos];
- *(dst2++) = src[pos + 1];
- }
- }
- }
- static void nv12_convert_to_i420(nv12_scale_t *s, uint8_t *dst_start, const uint8_t *src_start)
- {
- const int size = s->src_cx * s->src_cy;
- const int size_d4 = size / 4;
- memcpy(dst_start, src_start, size);
- register uint8_t *dst1 = dst_start + size;
- register uint8_t *dst2 = dst1 + size_d4;
- register uint8_t *dst_end = dst2 + size_d4;
- register const uint8_t *src = src_start + size;
- while (dst2 < dst_end) {
- *(dst1++) = *(src++);
- *(dst2++) = *(src++);
- }
- }
- static void nv12_scale_nearest_to_yuy2(nv12_scale_t *s, uint8_t *dst_start, const uint8_t *src)
- {
- register uint8_t *dst = dst_start;
- const int src_cx = s->src_cx;
- const int src_cy = s->src_cy;
- const int dst_cx = s->dst_cx;
- const int dst_cy = s->dst_cy;
- const int src_cx_d2 = src_cx / 2;
- const int src_cy_d2 = src_cy / 2;
- const int dst_cx_d2 = dst_cx / 2;
- const int dst_cy_d2 = dst_cy / 2;
- const int size = src_cx * src_cy;
- const uint8_t *src_uv = src + size;
- register int uv_flip = 0;
- for (int y = 0; y < dst_cy; y++) {
- const int src_line = y * src_cy / dst_cy * s->src_cx;
- const int src_line_d2 = y / 2 * src_cy_d2 / dst_cy_d2 * s->src_cx;
- for (int x = 0; x < dst_cx; x++) {
- const int src_x = x * src_cx / dst_cx;
- const int src_x_d2 = x / 2 * src_cx_d2 / dst_cx_d2;
- const int pos = src_line + src_x;
- const int pos_uv = src_line_d2 + src_x_d2 * 2 + uv_flip;
- *(dst++) = src[pos];
- *(dst++) = src_uv[pos_uv];
- uv_flip ^= 1;
- }
- }
- }
- static void nv12_convert_to_yuy2(nv12_scale_t *s, uint8_t *dst_start, const uint8_t *src_start)
- {
- const int size = s->src_cx * s->src_cy;
- const int size_dst_line = s->src_cx * 2;
- register const uint8_t *src_y = src_start;
- register const uint8_t *src_uv = src_y + size;
- register uint8_t *dst = dst_start;
- register uint8_t *dst_end = dst + size * 2;
- while (dst < dst_end) {
- register uint8_t *dst_line_end = dst + size_dst_line;
- const uint8_t *src_uv_start = src_uv;
- while (dst < dst_line_end) {
- *(dst++) = *(src_y++);
- *(dst++) = *(src_uv++);
- *(dst++) = *(src_y++);
- *(dst++) = *(src_uv++);
- }
- dst_line_end = dst + size_dst_line;
- src_uv = src_uv_start;
- while (dst < dst_line_end) {
- *(dst++) = *(src_y++);
- *(dst++) = *(src_uv++);
- *(dst++) = *(src_y++);
- *(dst++) = *(src_uv++);
- }
- }
- }
- void nv12_do_scale(nv12_scale_t *s, uint8_t *dst, const uint8_t *src)
- {
- if (s->src_cx == s->dst_cx && s->src_cy == s->dst_cy) {
- if (s->format == TARGET_FORMAT_I420)
- nv12_convert_to_i420(s, dst, src);
- else if (s->format == TARGET_FORMAT_YUY2)
- nv12_convert_to_yuy2(s, dst, src);
- else
- memcpy(dst, src, s->src_cx * s->src_cy * 3 / 2);
- } else {
- if (s->format == TARGET_FORMAT_I420)
- nv12_scale_nearest_to_i420(s, dst, src);
- else if (s->format == TARGET_FORMAT_YUY2)
- nv12_scale_nearest_to_yuy2(s, dst, src);
- else
- nv12_scale_nearest(s, dst, src);
- }
- }
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