From d5691344cee9285725b0128e11438155bf15bd9a Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Wed, 6 Nov 2019 15:07:44 +0800
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Subject: [PATCH 4/5] v4l2: Support preferred formats
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Set env "GST_V4L2_PREFERRED_FOURCC" to specify preferred formats, for
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example:
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export GST_V4L2SRC_PREFERRED_FOURCC=YU12:NV12
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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sys/v4l2/gstv4l2object.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
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index cf32bd6..37e1244 100644
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--- a/sys/v4l2/gstv4l2object.c
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+++ b/sys/v4l2/gstv4l2object.c
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@@ -25,6 +25,7 @@
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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+#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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@@ -1135,6 +1136,22 @@ gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt)
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break;
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}
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+ {
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+ const char *buf = g_getenv ("GST_V4L2_PREFERRED_FOURCC");
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+ int max_rank = YUV_BASE_RANK * 2;
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+
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+ while (buf) {
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+ if (buf[0] == ':')
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+ buf++;
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+
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+ if (!strncmp (buf, (char *) &fourcc, 4))
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+ rank = max_rank;
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+
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+ buf = strchr (buf, ':');
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+ max_rank--;
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+ }
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+ }
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+
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/* All ranks are below 1<<15 so a shift by 15
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* will a) make all non-emulated formats larger
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* than emulated and b) will not overflow
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--
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2.17.1
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