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gstvideo: Add gst_video_get_size_from_caps function

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gst_video_get_size_from_caps () allows easy calculation of the raw video
buffer size from some fixed video caps.

API: gst_video_get_size_from_caps()
This commit is contained in:
Robert Swain 2011-05-18 13:18:15 +02:00
parent c475464600
commit ad2010d379
3 changed files with 57 additions and 3 deletions
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32
gst-libs/gst/video/video.c
View file

@ -325,7 +325,7 @@ gst_video_parse_caps_chroma_site (GstCaps * caps)
* Returns: TRUE if @caps was parsed correctly.
*/
gboolean
gst_video_format_parse_caps (GstCaps * caps, GstVideoFormat * format,
gst_video_format_parse_caps (const GstCaps * caps, GstVideoFormat * format,
int *width, int *height)
{
GstStructure *structure;
@ -2066,6 +2066,36 @@ gst_video_format_get_size (GstVideoFormat format, int width, int height)
}
}
/**
* gst_video_get_size_from_caps:
* @caps: a pointer to #GstCaps
* @size: a pointer to a gint that will be assigned the size (in bytes) of a video frame with the given caps
*
* Calculates the total number of bytes in the raw video format for the given
* caps. This number should be used when allocating a buffer for raw video.
*
* Since: 0.10.34
*
* Returns: %TRUE if the size could be calculated from the caps
*/
gboolean
gst_video_get_size_from_caps (const GstCaps * caps, gint * size)
{
GstVideoFormat format = 0;
gint width = 0, height = 0;
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
g_return_val_if_fail (size != NULL, FALSE);
if (gst_video_format_parse_caps (caps, &format, &width, &height) == FALSE) {
GST_WARNING ("Could not parse caps: %" GST_PTR_FORMAT, caps);
return FALSE;
}
*size = gst_video_format_get_size (format, width, height);
return TRUE;
}
/**
* gst_video_format_convert:
* @format: a #GstVideoFormat

5
gst-libs/gst/video/video.h
View file

@ -446,8 +446,8 @@ gboolean gst_video_calculate_display_ratio (guint *dar_n, guint *dar_d,
guint video_par_n, guint video_par_d,
guint display_par_n, guint display_par_d);
gboolean gst_video_format_parse_caps (GstCaps *caps, GstVideoFormat *format,
int *width, int *height);
gboolean gst_video_format_parse_caps (const GstCaps *caps,
GstVideoFormat *format, int *width, int *height);
gboolean gst_video_format_parse_caps_interlaced (GstCaps *caps, gboolean *interlaced);
gboolean gst_video_parse_caps_framerate (GstCaps *caps,
int *fps_n, int *fps_d);
@ -480,6 +480,7 @@ int gst_video_format_get_component_height (GstVideoFormat format, int component,
int gst_video_format_get_component_offset (GstVideoFormat format, int component,
int width, int height);
int gst_video_format_get_size (GstVideoFormat format, int width, int height);
gboolean gst_video_get_size_from_caps (const GstCaps * caps, gint * size);
gboolean gst_video_format_convert (GstVideoFormat format, int width, int height,
int fps_n, int fps_d,
GstFormat src_format, gint64 src_value,

23
tests/check/libs/video.c
View file

@ -748,6 +748,28 @@ GST_START_TEST (test_convert_frame_async)
GST_END_TEST;
GST_START_TEST (test_video_size_from_caps)
{
gint size;
guint32 fourcc = GST_MAKE_FOURCC ('Y', 'V', '1', '2');
GstCaps *caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fourcc,
"width", G_TYPE_INT, 640,
"height", G_TYPE_INT, 480,
"framerate", GST_TYPE_FRACTION, 25, 1,
NULL);
fail_unless (gst_video_get_size_from_caps (caps, &size));
fail_unless (size ==
gst_video_format_get_size (gst_video_format_from_fourcc (fourcc), 640,
480));
fail_unless (size == (640 * 480 * 12 / 8));
gst_caps_unref (caps);
}
GST_END_TEST;
static Suite *
video_suite (void)
{
@ -763,6 +785,7 @@ video_suite (void)
tcase_add_test (tc_chain, test_events);
tcase_add_test (tc_chain, test_convert_frame);
tcase_add_test (tc_chain, test_convert_frame_async);
tcase_add_test (tc_chain, test_video_size_from_caps);
return s;
}