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Lavc: added pixfmt change from 420p to rgb

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This commit is contained in:
Martin Pulec
2013-01-25 12:45:11 +01:00
parent 8ce05c6711
commit 62d8a59ded
1 changed files with 47 additions and 2 deletions
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49
src/video_decompress/libavcodec.c
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@@ -82,6 +82,8 @@ static void yuv422p_to_yuv422(char *dst_buffer, AVFrame *in_frame,
int width, int height);
static void yuv422p_to_rgb24(char *dst_buffer, AVFrame *in_frame,
int width, int height);
static void yuv420p_to_rgb24(char *dst_buffer, AVFrame *in_frame,
int width, int height);
static int change_pixfmt(AVFrame *frame, unsigned char *dst, int av_codec,
codec_t out_codec, int width, int height);
@@ -291,6 +293,46 @@ static void yuv422p_to_rgb24(char *dst_buffer, AVFrame *in_frame,
}
}
/**
* Changes pixel format from planar YUV 422 to packed RGB.
* Color space is assumed ITU-T Rec. 609. YUV is expected to be full scale (aka in JPEG).
*/
static void yuv420p_to_rgb24(char *dst_buffer, AVFrame *in_frame,
int width, int height)
{
for(int y = 0; y < (int) height / 2; ++y) {
unsigned char *src_y1 = (unsigned char *) in_frame->data[0] + in_frame->linesize[0] * y * 2;
unsigned char *src_y2 = (unsigned char *) in_frame->data[0] + in_frame->linesize[0] * (y * 2 + 1);
unsigned char *src_cb = (unsigned char *) in_frame->data[1] + in_frame->linesize[1] * y;
unsigned char *src_cr = (unsigned char *) in_frame->data[2] + in_frame->linesize[2] * y;
unsigned char *dst1 = (unsigned char *) dst_buffer + width * (y * 2) * 3;
unsigned char *dst2 = (unsigned char *) dst_buffer + width * (y * 2 + 1) * 3;
for(int x = 0; x < width / 2; ++x) {
int cb = *src_cb++ - 128;
int cr = *src_cr++ - 128;
int y = *src_y1++ << 16;
int r = 75700 * cr;
int g = -26864 * cb - 38050 * cr;
int b = 133176 * cb;
*dst1++ = min(max(r + y, 0), (1<<24) - 1) >> 16;
*dst1++ = min(max(g + y, 0), (1<<24) - 1) >> 16;
*dst1++ = min(max(b + y, 0), (1<<24) - 1) >> 16;
y = *src_y1++ << 16;
*dst1++ = min(max(r + y, 0), (1<<24) - 1) >> 16;
*dst1++ = min(max(g + y, 0), (1<<24) - 1) >> 16;
*dst1++ = min(max(b + y, 0), (1<<24) - 1) >> 16;
y = *src_y2++ << 16;
*dst2++ = min(max(r + y, 0), (1<<24) - 1) >> 16;
*dst2++ = min(max(g + y, 0), (1<<24) - 1) >> 16;
*dst2++ = min(max(b + y, 0), (1<<24) - 1) >> 16;
y = *src_y2++ << 16;
*dst2++ = min(max(r + y, 0), (1<<24) - 1) >> 16;
*dst2++ = min(max(g + y, 0), (1<<24) - 1) >> 16;
*dst2++ = min(max(b + y, 0), (1<<24) - 1) >> 16;
}
}
}
/**
* Changes pixel format from frame to native (currently UYVY).
*
@@ -332,8 +374,11 @@ static int change_pixfmt(AVFrame *frame, unsigned char *dst, int av_codec,
case PIX_FMT_YUV420P:
case PIX_FMT_YUVJ420P:
#endif
assert(out_codec == UYVY);
yuv420p_to_yuv422((char *) dst, frame, width, height);
if(out_codec == UYVY) {
yuv420p_to_yuv422((char *) dst, frame, width, height);
} else {
yuv420p_to_rgb24((char *) dst, frame, width, height);
}
break;
default:
fprintf(stderr, "Unsupported pixel "