From 30176c223b5c45f44754551b58db4a105ff1231f 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 4/8] 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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sys/v4l2/gstv4l2src.c | 37 +++++++++++++++++++++++++++++++++++++
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2 files changed, 54 insertions(+)
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diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
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index 9eb3b8e..a7b7ea7 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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@@ -1137,6 +1138,22 @@ 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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diff --git a/sys/v4l2/gstv4l2src.c b/sys/v4l2/gstv4l2src.c
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index d00f7a8..1b2c1a6 100644
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--- a/sys/v4l2/gstv4l2src.c
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+++ b/sys/v4l2/gstv4l2src.c
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@@ -308,6 +308,38 @@ gst_v4l2_src_parse_fixed_struct (GstStructure * s,
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gst_structure_get_fraction (s, "framerate", fps_n, fps_d);
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}
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+static gint
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+gst_v4l2src_get_format_loss (GstStructure * s)
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+{
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+ GstVideoFormat format;
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+ const gchar *buf = g_getenv ("GST_V4L2_PREFERRED_FOURCC");
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+ guint32 fourcc, loss;
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+
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+ if (!buf)
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+ return 0;
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+
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+ format =
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+ gst_video_format_from_string (gst_structure_get_string (s, "format"));
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+ if (format == GST_VIDEO_FORMAT_UNKNOWN)
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+ return 0;
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+
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+ fourcc = gst_video_format_to_fourcc (format);
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+
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+ loss = 0;
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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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+ return loss;
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+
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+ buf = strchr (buf, ':');
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+ loss++;
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+ }
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+
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+ return loss;
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+}
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+
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/* TODO Consider framerate */
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static gint
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gst_v4l2src_fixed_caps_compare (GstCaps * caps_a, GstCaps * caps_b,
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@@ -360,6 +392,11 @@ gst_v4l2src_fixed_caps_compare (GstCaps * caps_a, GstCaps * caps_b,
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if (bh == pref->height)
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bd -= 1;
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+ if (ad == bd) {
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+ ad = gst_v4l2src_get_format_loss (a);
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+ bd = gst_v4l2src_get_format_loss (b);
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+ }
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+
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/* If the choices are equivalent, maintain the order */
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if (ad == bd)
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ret = 1;
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--
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2.20.1
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