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plugins: add helpers to create video caps with features.

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Add gst_vaapi_video_format_new_template_caps_with_features() helper
function to add the supplied caps feature string on GStreamer >= 1.2.

Add gst_vaapi_find_preferred_caps_feature() helper function to discover
the "best" caps feature to use for the supplied pad. In practice, we
will always favor memory:VASurface first, then meta:GLTextureUploadMeta,
and finally the system memory caps.

https://bugzilla.gnome.org/show_bug.cgi?id=719372
This commit is contained in:
Gwenole Beauchesne 2014-01-14 19:08:36 +01:00
parent b065ae7d7f
commit ef9819ecf4
2 changed files with 111 additions and 0 deletions
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92
gst/vaapi/gstvaapipluginutil.c
View file

@ -475,6 +475,98 @@ gst_vaapi_video_format_new_template_caps_from_list (GArray * formats)
return caps;
}
GstCaps *
gst_vaapi_video_format_new_template_caps_with_features (GstVideoFormat format,
const gchar * features_string)
{
GstCaps *caps;
caps = gst_vaapi_video_format_new_template_caps (format);
if (!caps)
return NULL;
#if GST_CHECK_VERSION(1,1,0)
GstCapsFeatures *const features =
gst_caps_features_new (features_string, NULL);
if (!features) {
gst_caps_unref (caps);
return NULL;
}
gst_caps_set_features (caps, 0, features);
#endif
return caps;
}
GstVaapiCapsFeature
gst_vaapi_find_preferred_caps_feature (GstPad * pad, GstVideoFormat format)
{
GstVaapiCapsFeature feature = GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY;
#if GST_CHECK_VERSION(1,1,0)
guint i, num_structures;
GstCaps *caps = NULL;
GstCaps *gl_texture_upload_caps = NULL;
GstCaps *sysmem_caps = NULL;
GstCaps *vaapi_caps = NULL;
GstCaps *out_caps;
out_caps = gst_pad_peer_query_caps (pad, NULL);
if (!out_caps)
goto cleanup;
gl_texture_upload_caps =
gst_vaapi_video_format_new_template_caps_with_features
(GST_VIDEO_FORMAT_RGBA,
GST_CAPS_FEATURE_META_GST_VIDEO_GL_TEXTURE_UPLOAD_META);
if (!gl_texture_upload_caps)
goto cleanup;
if (format == GST_VIDEO_FORMAT_ENCODED)
format = GST_VIDEO_FORMAT_NV12;
vaapi_caps =
gst_vaapi_video_format_new_template_caps_with_features (format,
GST_CAPS_FEATURE_MEMORY_VAAPI_SURFACE);
if (!vaapi_caps)
goto cleanup;
sysmem_caps =
gst_vaapi_video_format_new_template_caps_with_features (format,
GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
if (!sysmem_caps)
goto cleanup;
num_structures = gst_caps_get_size (out_caps);
for (i = 0; i < num_structures; i++) {
GstCapsFeatures *const features = gst_caps_get_features (out_caps, i);
GstStructure *const structure = gst_caps_get_structure (out_caps, i);
caps = gst_caps_new_full (gst_structure_copy (structure), NULL);
if (!caps)
continue;
gst_caps_set_features (caps, 0, gst_caps_features_copy (features));
if (gst_caps_can_intersect (caps, vaapi_caps) &&
feature < GST_VAAPI_CAPS_FEATURE_VAAPI_SURFACE)
feature = GST_VAAPI_CAPS_FEATURE_VAAPI_SURFACE;
else if (gst_caps_can_intersect (caps, gl_texture_upload_caps) &&
feature < GST_VAAPI_CAPS_FEATURE_GL_TEXTURE_UPLOAD_META)
feature = GST_VAAPI_CAPS_FEATURE_GL_TEXTURE_UPLOAD_META;
else if (gst_caps_can_intersect (caps, sysmem_caps) &&
feature < GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY)
feature = GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY;
gst_caps_replace (&caps, NULL);
}
cleanup:
gst_caps_replace (&gl_texture_upload_caps, NULL);
gst_caps_replace (&sysmem_caps, NULL);
gst_caps_replace (&vaapi_caps, NULL);
gst_caps_replace (&caps, NULL);
gst_caps_replace (&out_caps, NULL);
#endif
return feature;
}
gboolean
gst_caps_set_interlaced (GstCaps * caps, GstVideoInfo * vip)
{

19
gst/vaapi/gstvaapipluginutil.h
View file

@ -27,6 +27,9 @@
#include <gst/vaapi/gstvaapidisplay.h>
#include <gst/vaapi/gstvaapisurface.h>
#if GST_CHECK_VERSION(1,0,0)
#include "gstvaapivideomemory.h"
#endif
G_GNUC_INTERNAL
gboolean
@ -65,6 +68,13 @@ gboolean
gst_vaapi_value_set_format_list (GValue * value, GArray * formats);
/* Helpers to build video caps */
typedef enum
{
GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY = 1,
GST_VAAPI_CAPS_FEATURE_GL_TEXTURE_UPLOAD_META,
GST_VAAPI_CAPS_FEATURE_VAAPI_SURFACE,
} GstVaapiCapsFeature;
G_GNUC_INTERNAL
GstCaps *
gst_vaapi_video_format_new_template_caps (GstVideoFormat format);
@ -73,6 +83,15 @@ G_GNUC_INTERNAL
GstCaps *
gst_vaapi_video_format_new_template_caps_from_list (GArray * formats);
G_GNUC_INTERNAL
GstCaps *
gst_vaapi_video_format_new_template_caps_with_features (GstVideoFormat format,
const gchar * features_string);
G_GNUC_INTERNAL
GstVaapiCapsFeature
gst_vaapi_find_preferred_caps_feature (GstPad * pad, GstVideoFormat format);
/* Helpers to handle interlaced contents */
#if GST_CHECK_VERSION(1,0,0)
# define GST_CAPS_INTERLACED_MODES \