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plugin: util: add helper function build_template_coded_caps_by_codec()

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Like build_template_raw_caps_by_codec(), this function can detect and
build the caps for specified codec based on the query of the profiles.
The result is coded caps such as video/x-h265, video/x-h264. The result
can be used as the template of encode's src or decode's sink.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/354>
This commit is contained in:
He Junyan 2020-07-08 18:30:00 +08:00 committed by Víctor Manuel Jáquez Leal
parent 617dba3869
commit 53d5302cde
2 changed files with 81 additions and 1 deletions
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74
gst/vaapi/gstvaapipluginutil.c
View file

@ -1275,3 +1275,77 @@ gst_vaapi_structure_set_profiles (GstStructure * st, gchar ** list)
g_value_unset (&value);
g_value_unset (&vlist);
}
/**
* gst_vaapi_build_template_coded_caps_by_codec:
* @display: a #GstVaapiDisplay
* @usage: used for encode or decode
* @codec: a #GstVaapiCodec specify the codec to detect
* @caps_str: a string of basic caps
*
* Called by vaapi elements to detect the all possible profiles belong to the
* specified codec and build the caps based on the basic caps description.
*
* Returns: a built #GstCaps if succeeds, or %NULL if error.
**/
GstCaps *
gst_vaapi_build_template_coded_caps_by_codec (GstVaapiDisplay * display,
GstVaapiContextUsage usage, GstVaapiCodec codec, const char *caps_str,
GstVaapiProfileToStrFunc func)
{
GValue v_profiles = G_VALUE_INIT;
GValue v_profile = G_VALUE_INIT;
GstCaps *caps = NULL;
guint i, num;
GArray *profiles = NULL;
GstVaapiProfile profile;
const gchar *str;
caps = gst_caps_from_string (caps_str);
if (!caps)
goto out;
if (!func)
goto out;
/* If no profiles, just ignore the profile field. */
if (usage == GST_VAAPI_CONTEXT_USAGE_ENCODE) {
profiles = gst_vaapi_display_get_encode_profiles (display);
} else if (usage == GST_VAAPI_CONTEXT_USAGE_DECODE) {
profiles = gst_vaapi_display_get_decode_profiles (display);
}
if (!profiles || profiles->len == 0)
goto out;
num = 0;
g_value_init (&v_profiles, GST_TYPE_LIST);
g_value_init (&v_profile, G_TYPE_STRING);
for (i = 0; i < profiles->len; i++) {
profile = g_array_index (profiles, GstVaapiProfile, i);
if (gst_vaapi_profile_get_codec (profile) != codec)
continue;
str = func (profile);
if (!str)
continue;
g_value_set_string (&v_profile, str);
num++;
gst_value_list_append_value (&v_profiles, &v_profile);
}
if (num == 1) {
gst_caps_set_value (caps, "profile", &v_profile);
} else if (num > 1) {
gst_caps_set_value (caps, "profile", &v_profiles);
}
out:
g_value_unset (&v_profile);
g_value_unset (&v_profiles);
if (profiles)
g_array_unref (profiles);
return caps;
}

8
gst/vaapi/gstvaapipluginutil.h
View file

@ -31,7 +31,7 @@
#include "gstvaapivideomemory.h"
typedef GstVaapiProfile (*GstVaapiStrToProfileFunc) (const gchar * str);
typedef const gchar * (*GstVaapiProfileToStrFunc) (GstVaapiProfile profile);
G_GNUC_INTERNAL
gboolean
@ -175,4 +175,10 @@ G_GNUC_INTERNAL
void
gst_vaapi_structure_set_profiles (GstStructure * st, gchar ** list);
G_GNUC_INTERNAL
GstCaps *
gst_vaapi_build_template_coded_caps_by_codec (GstVaapiDisplay * display,
GstVaapiContextUsage usage, GstVaapiCodec codec, const char *caps_str,
GstVaapiProfileToStrFunc func);
#endif /* GST_VAAPI_PLUGIN_UTIL_H */