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Subject: v4l2grab: add the basic logic to support planar formats Author: Mauro Carvalho Chehab <[email protected]> Date: Sun Oct 31 16:31:56 2021 +0000 Planar formats usually place 3 planes. On YUV formats, the plane 0 is luma, and planes 1 and 2 are for the chroma components, which are usually decimated. Add support for that at the core of the conversion logic. Signed-off-by: Mauro Carvalho Chehab <[email protected]> contrib/test/v4l2grab.c | 65 ++++++++++++++++++++++++++++++++++++------------- 1 file changed, 48 insertions(+), 17 deletions(-) --- http://git.linuxtv.org/cgit.cgi/v4l-utils.git/commit/?id=a76053007b95c8942cfd39d437e6ecdcbc902c08 diff --git a/contrib/test/v4l2grab.c b/contrib/test/v4l2grab.c index aae9c0a6a461..5dab5bb09d93 100644 --- a/contrib/test/v4l2grab.c +++ b/contrib/test/v4l2grab.c @@ -235,7 +235,9 @@ static void convert_yuv(enum v4l2_ycbcr_encoding enc, static void copy_two_pixels(struct v4l2_format *fmt, enum v4l2_ycbcr_encoding enc, - unsigned char *src, + unsigned char *plane0, + unsigned char *plane1, + unsigned char *plane2, unsigned char **dst) { uint32_t fourcc = fmt->fmt.pix.pixelformat; @@ -246,24 +248,24 @@ static void copy_two_pixels(struct v4l2_format *fmt, switch (fmt->fmt.pix.pixelformat) { case V4L2_PIX_FMT_RGB565: /* rrrrrggg gggbbbbb */ for (i = 0; i < 2; i++) { - pix = (src[0] << 8) + src[1]; + pix = (plane0[0] << 8) + plane0[1]; *(*dst)++ = (unsigned char)(((pix & 0xf800) >> 11) << 3) | 0x07; *(*dst)++ = (unsigned char)((((pix & 0x07e0) >> 5)) << 2) | 0x03; *(*dst)++ = (unsigned char)((pix & 0x1f) << 3) | 0x07; - src += 2; + plane0 += 2; } break; case V4L2_PIX_FMT_RGB565X: /* gggbbbbb rrrrrggg */ for (i = 0; i < 2; i++) { - pix = (src[1] << 8) + src[0]; + pix = (plane0[1] << 8) + plane0[0]; *(*dst)++ = (unsigned char)(((pix & 0xf800) >> 11) << 3) | 0x07; *(*dst)++ = (unsigned char)((((pix & 0x07e0) >> 5)) << 2) | 0x03; *(*dst)++ = (unsigned char)((pix & 0x1f) << 3) | 0x07; - src += 2; + plane0 += 2; } break; case V4L2_PIX_FMT_YUYV: @@ -273,34 +275,45 @@ static void copy_two_pixels(struct v4l2_format *fmt, y_off = (fourcc == V4L2_PIX_FMT_YUYV || fourcc == V4L2_PIX_FMT_YVYU) ? 0 : 1; u_off = (fourcc == V4L2_PIX_FMT_YUYV || fourcc == V4L2_PIX_FMT_UYVY) ? 0 : 2; - u = src[(1 - y_off) + u_off]; - v = src[(1 - y_off) + (2 - u_off)]; + u = plane0[(1 - y_off) + u_off]; + v = plane0[(1 - y_off) + (2 - u_off)]; for (i = 0; i < 2; i++) - convert_yuv(enc, src[y_off + (i << 1)], u, v, dst); + convert_yuv(enc, plane0[y_off + (i << 1)], u, v, dst); break; default: case V4L2_PIX_FMT_BGR24: for (i = 0; i < 2; i++) { - *(*dst)++ = src[2]; - *(*dst)++ = src[1]; - *(*dst)++ = src[0]; + *(*dst)++ = plane0[2]; + *(*dst)++ = plane0[1]; + *(*dst)++ = plane0[0]; - src += 3; + plane0 += 3; } break; } } -static unsigned int convert_to_rgb24(struct v4l2_format *fmt, unsigned char *p_in, +static unsigned int convert_to_rgb24(struct v4l2_format *fmt, + unsigned char *plane0, unsigned char *p_out) { - unsigned char *p_start; - unsigned int x, y, depth; uint32_t width = fmt->fmt.pix.width; uint32_t height = fmt->fmt.pix.height; + uint32_t bytesperline = fmt->fmt.pix.bytesperline; + unsigned char *plane0_start = plane0; + unsigned char *plane1_start = NULL; + unsigned char *plane2_start = NULL; + unsigned char *plane1 = NULL; + unsigned char *plane2 = NULL; enum v4l2_ycbcr_encoding enc; + unsigned int x, y, depth; + uint32_t num_planes = 1; + unsigned char *p_start; + uint32_t plane0_size; + uint32_t w_dec = 0; + uint32_t h_dec = 0; if (fmt->fmt.pix.ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT) enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->fmt.pix.colorspace); @@ -325,11 +338,29 @@ static unsigned int convert_to_rgb24(struct v4l2_format *fmt, unsigned char *p_i p_start = p_out; + if (num_planes > 1) { + plane0_size = (width * height * depth) >> 3; + plane1_start = plane0_start + plane0_size; + } + + if (num_planes > 2) + plane2_start = plane1_start + (plane0_size >> (w_dec + h_dec)); + for (y = 0; y < height; y++) { + plane0 = plane0_start + bytesperline * y; + if (num_planes > 1) + plane1 = plane1_start + (bytesperline >> w_dec) * (y >> h_dec); + if (num_planes > 2) + plane2 = plane2_start + (bytesperline >> w_dec) * (y >> h_dec); + for (x = 0; x < width >> 1; x++) { - copy_two_pixels(fmt, enc, p_in, &p_out); + copy_two_pixels(fmt, enc, plane0, plane1, plane2, &p_out); - p_in += depth >> 2; + plane0 += depth >> 2; + if (num_planes > 1) + plane1 += depth >> (2 + w_dec); + if (num_planes > 2) + plane2 += depth >> (2 + w_dec); } } _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
