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gstreamer/gst-libs/gst/video/video.c
Mark Nauwelaerts 40aad050e2 video: init video info to some sensible defaults
2011-07-10 21:47:12 +02:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Library <2002> Ronald Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2007 David A. Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include "video.h"
#include "gstmetavideo.h"
static int fill_planes (GstVideoInfo * info);
typedef struct
{
guint32 fourcc;
GstVideoFormatInfo info;
} VideoFormat;
/* depths */
#define DPTH0 0, { 0, 0, 0, 0 }
#define DPTH8 1, { 8, 0, 0, 0 }
#define DPTH888 3, { 8, 8, 8, 0 }
#define DPTH8888 4, { 8, 8, 8, 8 }
#define DPTH10_10_10 3, { 10, 10, 10, 0 }
#define DPTH16 1, { 16, 0, 0, 0 }
#define DPTH16_16_16 3, { 16, 16, 16, 0 }
#define DPTH16_16_16_16 4, { 16, 16, 16, 16 }
#define DPTH555 3, { 5, 5, 5, 0 }
#define DPTH565 3, { 5, 6, 5, 0 }
/* pixel strides */
#define PSTR0 { 0, 0, 0, 0 }
#define PSTR1 { 1, 0, 0, 0 }
#define PSTR111 { 1, 1, 1, 0 }
#define PSTR1111 { 1, 1, 1, 1 }
#define PSTR122 { 1, 2, 2, 0 }
#define PSTR2 { 2, 0, 0, 0 }
#define PSTR222 { 2, 2, 2, 0 }
#define PSTR244 { 2, 4, 4, 0 }
#define PSTR444 { 4, 4, 4, 0 }
#define PSTR4444 { 4, 4, 4, 4 }
#define PSTR333 { 3, 3, 3, 0 }
#define PSTR488 { 4, 8, 8, 0 }
#define PSTR8888 { 8, 8, 8, 8 }
/* planes */
#define PLANE_NA 0, { 0, 0, 0, 0 }
#define PLANE0 1, { 0, 0, 0, 0 }
#define PLANE011 2, { 0, 1, 1, 0 }
#define PLANE012 3, { 0, 1, 2, 0 }
#define PLANE0123 4, { 0, 1, 2, 3 }
#define PLANE021 3, { 0, 2, 1, 0 }
/* offsets */
#define OFFS0 { 0, 0, 0, 0 }
#define OFFS013 { 0, 1, 3, 0 }
#define OFFS102 { 1, 0, 2, 0 }
#define OFFS1230 { 1, 2, 3, 0 }
#define OFFS012 { 0, 1, 2, 0 }
#define OFFS210 { 2, 1, 0, 0 }
#define OFFS123 { 1, 2, 3, 0 }
#define OFFS321 { 3, 2, 1, 0 }
#define OFFS0123 { 0, 1, 2, 3 }
#define OFFS2103 { 2, 1, 0, 3 }
#define OFFS3210 { 3, 2, 1, 0 }
#define OFFS031 { 0, 3, 1, 0 }
#define OFFS026 { 0, 2, 6, 0 }
#define OFFS001 { 0, 0, 1, 0 }
#define OFFS010 { 0, 1, 0, 0 }
#define OFFS104 { 1, 0, 4, 0 }
#define OFFS2460 { 2, 4, 6, 0 }
/* subsampling */
#define SUB410 { 0, 2, 2, 0 }, { 0, 2, 2, 0 }
#define SUB411 { 0, 2, 2, 0 }, { 0, 0, 0, 0 }
#define SUB420 { 0, 1, 1, 0 }, { 0, 1, 1, 0 }
#define SUB422 { 0, 1, 1, 0 }, { 0, 0, 0, 0 }
#define SUB4 { 0, 0, 0, 0 }, { 0, 0, 0, 0 }
#define SUB444 { 0, 0, 0, 0 }, { 0, 0, 0, 0 }
#define SUB4444 { 0, 0, 0, 0 }, { 0, 0, 0, 0 }
#define SUB4204 { 0, 1, 1, 0 }, { 0, 1, 1, 0 }
#define MAKE_YUV_FORMAT(name, fourcc, depth, pstride, plane, offs, sub ) \
{ fourcc, {GST_VIDEO_FORMAT_ ##name, G_STRINGIFY(name), GST_VIDEO_FORMAT_FLAG_YUV, depth, pstride, plane, offs, sub } }
#define MAKE_YUVA_FORMAT(name, fourcc, depth, pstride, plane, offs, sub) \
{ fourcc, {GST_VIDEO_FORMAT_ ##name, G_STRINGIFY(name), GST_VIDEO_FORMAT_FLAG_YUV | GST_VIDEO_FORMAT_FLAG_ALPHA, depth, pstride, plane, offs, sub } }
#define MAKE_RGB_FORMAT(name, depth, pstride, plane, offs, sub) \
{ 0x00000000, {GST_VIDEO_FORMAT_ ##name, G_STRINGIFY(name), GST_VIDEO_FORMAT_FLAG_RGB, depth, pstride, plane, offs, sub } }
#define MAKE_RGBA_FORMAT(name, depth, pstride, plane, offs, sub) \
{ 0x00000000, {GST_VIDEO_FORMAT_ ##name, G_STRINGIFY(name), GST_VIDEO_FORMAT_FLAG_RGB | GST_VIDEO_FORMAT_FLAG_ALPHA, depth, pstride, plane, offs, sub } }
#define MAKE_GRAY_FORMAT(name, depth, pstride, plane, offs, sub) \
{ 0x00000000, {GST_VIDEO_FORMAT_ ##name, G_STRINGIFY(name), GST_VIDEO_FORMAT_FLAG_GRAY, depth, pstride, plane, offs, sub } }
static VideoFormat formats[] = {
{0x00000000, {GST_VIDEO_FORMAT_UNKNOWN, "UNKNOWN", 0, DPTH0, PSTR0, PLANE_NA,
OFFS0}},
MAKE_YUV_FORMAT (I420, GST_MAKE_FOURCC ('I', '4', '2', '0'), DPTH888, PSTR111,
PLANE012, OFFS0, SUB420),
MAKE_YUV_FORMAT (YV12, GST_MAKE_FOURCC ('Y', 'V', '1', '2'), DPTH888, PSTR111,
PLANE021, OFFS0, SUB420),
MAKE_YUV_FORMAT (YUY2, GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'), DPTH888, PSTR244,
PLANE0, OFFS013, SUB422),
MAKE_YUV_FORMAT (UYVY, GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'), DPTH888, PSTR244,
PLANE0, OFFS102, SUB422),
MAKE_YUVA_FORMAT (AYUV, GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'), DPTH8888,
PSTR4444, PLANE0, OFFS1230, SUB4444),
MAKE_RGB_FORMAT (RGBx, DPTH888, PSTR444, PLANE0, OFFS012, SUB444),
MAKE_RGB_FORMAT (BGRx, DPTH888, PSTR444, PLANE0, OFFS210, SUB444),
MAKE_RGB_FORMAT (xRGB, DPTH888, PSTR444, PLANE0, OFFS123, SUB444),
MAKE_RGB_FORMAT (xBGR, DPTH888, PSTR444, PLANE0, OFFS321, SUB444),
MAKE_RGBA_FORMAT (RGBA, DPTH8888, PSTR4444, PLANE0, OFFS0123, SUB4444),
MAKE_RGBA_FORMAT (BGRA, DPTH8888, PSTR4444, PLANE0, OFFS2103, SUB4444),
MAKE_RGBA_FORMAT (ARGB, DPTH8888, PSTR4444, PLANE0, OFFS1230, SUB4444),
MAKE_RGBA_FORMAT (ABGR, DPTH8888, PSTR4444, PLANE0, OFFS3210, SUB4444),
MAKE_RGB_FORMAT (RGB, DPTH888, PSTR333, PLANE0, OFFS012, SUB444),
MAKE_RGB_FORMAT (BGR, DPTH888, PSTR333, PLANE0, OFFS210, SUB444),
MAKE_YUV_FORMAT (Y41B, GST_MAKE_FOURCC ('Y', '4', '1', 'B'), DPTH888, PSTR111,
PLANE012, OFFS0, SUB411),
MAKE_YUV_FORMAT (Y42B, GST_MAKE_FOURCC ('Y', '4', '2', 'B'), DPTH888, PSTR111,
PLANE012, OFFS0, SUB422),
MAKE_YUV_FORMAT (YVYU, GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'), DPTH888, PSTR244,
PLANE0, OFFS031, SUB422),
MAKE_YUV_FORMAT (Y444, GST_MAKE_FOURCC ('Y', '4', '4', '4'), DPTH888, PSTR111,
PLANE012, OFFS0, SUB444),
MAKE_YUV_FORMAT (v210, GST_MAKE_FOURCC ('v', '2', '1', '0'), DPTH10_10_10,
PSTR0, PLANE0, OFFS0, SUB422),
MAKE_YUV_FORMAT (v216, GST_MAKE_FOURCC ('v', '2', '1', '6'), DPTH16_16_16,
PSTR488, PLANE0, OFFS026, SUB422),
MAKE_YUV_FORMAT (NV12, GST_MAKE_FOURCC ('N', 'V', '1', '2'), DPTH888, PSTR122,
PLANE011, OFFS001, SUB420),
MAKE_YUV_FORMAT (NV21, GST_MAKE_FOURCC ('N', 'V', '2', '1'), DPTH888, PSTR122,
PLANE011, OFFS010, SUB420),
MAKE_GRAY_FORMAT (GRAY8, DPTH8, PSTR1, PLANE0, OFFS0, SUB4),
MAKE_GRAY_FORMAT (GRAY16_BE, DPTH16, PSTR2, PLANE0, OFFS0, SUB4),
MAKE_GRAY_FORMAT (GRAY16_LE, DPTH16, PSTR2, PLANE0, OFFS0, SUB4),
MAKE_YUV_FORMAT (v308, GST_MAKE_FOURCC ('v', '3', '0', '8'), DPTH888, PSTR333,
PLANE0, OFFS012, SUB444),
MAKE_YUV_FORMAT (Y800, GST_MAKE_FOURCC ('Y', '8', '0', '0'), DPTH8, PSTR1,
PLANE0, OFFS0, SUB4),
MAKE_YUV_FORMAT (Y16, GST_MAKE_FOURCC ('Y', '1', '6', ' '), DPTH16, PSTR2,
PLANE0, OFFS0, SUB4),
MAKE_RGB_FORMAT (RGB16, DPTH565, PSTR222, PLANE0, OFFS0, SUB444),
MAKE_RGB_FORMAT (BGR16, DPTH565, PSTR222, PLANE0, OFFS0, SUB444),
MAKE_RGB_FORMAT (RGB15, DPTH555, PSTR222, PLANE0, OFFS0, SUB444),
MAKE_RGB_FORMAT (BGR15, DPTH555, PSTR222, PLANE0, OFFS0, SUB444),
MAKE_YUV_FORMAT (UYVP, GST_MAKE_FOURCC ('U', 'Y', 'V', 'P'), DPTH10_10_10,
PSTR0, PLANE0, OFFS0, SUB422),
MAKE_YUVA_FORMAT (A420, GST_MAKE_FOURCC ('A', '4', '2', '0'), DPTH8888,
PSTR1111, PLANE0123, OFFS0, SUB4204),
MAKE_RGBA_FORMAT (RGB8_PALETTED, DPTH8888, PSTR1111, PLANE0, OFFS0, SUB4444),
MAKE_YUV_FORMAT (YUV9, GST_MAKE_FOURCC ('Y', 'U', 'V', '9'), DPTH888, PSTR111,
PLANE012, OFFS0, SUB410),
MAKE_YUV_FORMAT (YVU9, GST_MAKE_FOURCC ('Y', 'V', 'U', '9'), DPTH888, PSTR111,
PLANE021, OFFS0, SUB410),
MAKE_YUV_FORMAT (IYU1, GST_MAKE_FOURCC ('I', 'Y', 'U', '1'), DPTH888, PSTR0,
PLANE0, OFFS104, SUB411),
MAKE_RGBA_FORMAT (ARGB64, DPTH16_16_16_16, PSTR8888, PLANE0, OFFS2460,
SUB444),
MAKE_YUVA_FORMAT (AYUV64, 0x00000000, DPTH16_16_16_16, PSTR8888, PLANE0,
OFFS2460, SUB444),
MAKE_YUV_FORMAT (r210, GST_MAKE_FOURCC ('r', '2', '1', '0'), DPTH10_10_10,
PSTR444, PLANE0, OFFS0, SUB444),
};
/**
* SECTION:gstvideo
* @short_description: Support library for video operations
*
* <refsect2>
* <para>
* This library contains some helper functions and includes the
* videosink and videofilter base classes.
* </para>
* </refsect2>
*/
/**
* gst_video_calculate_display_ratio:
* @dar_n: Numerator of the calculated display_ratio
* @dar_d: Denominator of the calculated display_ratio
* @video_width: Width of the video frame in pixels
* @video_height: Height of the video frame in pixels
* @video_par_n: Numerator of the pixel aspect ratio of the input video.
* @video_par_d: Denominator of the pixel aspect ratio of the input video.
* @display_par_n: Numerator of the pixel aspect ratio of the display device
* @display_par_d: Denominator of the pixel aspect ratio of the display device
*
* Given the Pixel Aspect Ratio and size of an input video frame, and the
* pixel aspect ratio of the intended display device, calculates the actual
* display ratio the video will be rendered with.
*
* Returns: A boolean indicating success and a calculated Display Ratio in the
* dar_n and dar_d parameters.
* The return value is FALSE in the case of integer overflow or other error.
*
* Since: 0.10.7
*/
gboolean
gst_video_calculate_display_ratio (guint * dar_n, guint * dar_d,
guint video_width, guint video_height,
guint video_par_n, guint video_par_d,
guint display_par_n, guint display_par_d)
{
gint num, den;
gint tmp_n, tmp_d;
g_return_val_if_fail (dar_n != NULL, FALSE);
g_return_val_if_fail (dar_d != NULL, FALSE);
/* Calculate (video_width * video_par_n * display_par_d) /
* (video_height * video_par_d * display_par_n) */
if (!gst_util_fraction_multiply (video_width, video_height, video_par_n,
video_par_d, &tmp_n, &tmp_d))
goto error_overflow;
if (!gst_util_fraction_multiply (tmp_n, tmp_d, display_par_d, display_par_n,
&num, &den))
goto error_overflow;
g_return_val_if_fail (num > 0, FALSE);
g_return_val_if_fail (den > 0, FALSE);
*dar_n = num;
*dar_d = den;
return TRUE;
/* ERRORS */
error_overflow:
{
GST_WARNING ("overflow in multiply");
return FALSE;
}
}
static GstVideoFormat
gst_video_format_from_rgb32_masks (int red_mask, int green_mask, int blue_mask)
{
if (red_mask == 0xff000000 && green_mask == 0x00ff0000 &&
blue_mask == 0x0000ff00) {
return GST_VIDEO_FORMAT_RGBx;
}
if (red_mask == 0x0000ff00 && green_mask == 0x00ff0000 &&
blue_mask == 0xff000000) {
return GST_VIDEO_FORMAT_BGRx;
}
if (red_mask == 0x00ff0000 && green_mask == 0x0000ff00 &&
blue_mask == 0x000000ff) {
return GST_VIDEO_FORMAT_xRGB;
}
if (red_mask == 0x000000ff && green_mask == 0x0000ff00 &&
blue_mask == 0x00ff0000) {
return GST_VIDEO_FORMAT_xBGR;
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
static GstVideoFormat
gst_video_format_from_rgba32_masks (int red_mask, int green_mask,
int blue_mask, int alpha_mask)
{
if (red_mask == 0xff000000 && green_mask == 0x00ff0000 &&
blue_mask == 0x0000ff00 && alpha_mask == 0x000000ff) {
return GST_VIDEO_FORMAT_RGBA;
}
if (red_mask == 0x0000ff00 && green_mask == 0x00ff0000 &&
blue_mask == 0xff000000 && alpha_mask == 0x000000ff) {
return GST_VIDEO_FORMAT_BGRA;
}
if (red_mask == 0x00ff0000 && green_mask == 0x0000ff00 &&
blue_mask == 0x000000ff && alpha_mask == 0xff000000) {
return GST_VIDEO_FORMAT_ARGB;
}
if (red_mask == 0x000000ff && green_mask == 0x0000ff00 &&
blue_mask == 0x00ff0000 && alpha_mask == 0xff000000) {
return GST_VIDEO_FORMAT_ABGR;
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
static GstVideoFormat
gst_video_format_from_rgb24_masks (int red_mask, int green_mask, int blue_mask)
{
if (red_mask == 0xff0000 && green_mask == 0x00ff00 && blue_mask == 0x0000ff) {
return GST_VIDEO_FORMAT_RGB;
}
if (red_mask == 0x0000ff && green_mask == 0x00ff00 && blue_mask == 0xff0000) {
return GST_VIDEO_FORMAT_BGR;
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
#define GST_VIDEO_COMP1_MASK_16_INT 0xf800
#define GST_VIDEO_COMP2_MASK_16_INT 0x07e0
#define GST_VIDEO_COMP3_MASK_16_INT 0x001f
#define GST_VIDEO_COMP1_MASK_15_INT 0x7c00
#define GST_VIDEO_COMP2_MASK_15_INT 0x03e0
#define GST_VIDEO_COMP3_MASK_15_INT 0x001f
static GstVideoFormat
gst_video_format_from_rgb16_masks (int red_mask, int green_mask, int blue_mask)
{
if (red_mask == GST_VIDEO_COMP1_MASK_16_INT
&& green_mask == GST_VIDEO_COMP2_MASK_16_INT
&& blue_mask == GST_VIDEO_COMP3_MASK_16_INT) {
return GST_VIDEO_FORMAT_RGB16;
}
if (red_mask == GST_VIDEO_COMP3_MASK_16_INT
&& green_mask == GST_VIDEO_COMP2_MASK_16_INT
&& blue_mask == GST_VIDEO_COMP1_MASK_16_INT) {
return GST_VIDEO_FORMAT_BGR16;
}
if (red_mask == GST_VIDEO_COMP1_MASK_15_INT
&& green_mask == GST_VIDEO_COMP2_MASK_15_INT
&& blue_mask == GST_VIDEO_COMP3_MASK_15_INT) {
return GST_VIDEO_FORMAT_RGB15;
}
if (red_mask == GST_VIDEO_COMP3_MASK_15_INT
&& green_mask == GST_VIDEO_COMP2_MASK_15_INT
&& blue_mask == GST_VIDEO_COMP1_MASK_15_INT) {
return GST_VIDEO_FORMAT_BGR15;
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
/**
* gst_video_format_from_masks:
* @depth: the amount of bits used for a pixel
* @bpp: the amount of bits used to store a pixel. This value is bigger than
* @depth
* @endianness: the endianness of the masks
* @red_mask: the red mask
* @green_mask: the green mask
* @blue_mask: the blue mask
* @alpha_mask: the optional alpha mask
*
* Find the #GstVideoFormat for the given parameters.
*
* Returns: a #GstVideoFormat or GST_VIDEO_FORMAT_UNKNOWN when the parameters to
* not specify a known format.
*/
GstVideoFormat
gst_video_format_from_masks (gint depth, gint bpp, gint endianness,
gint red_mask, gint green_mask, gint blue_mask, gint alpha_mask)
{
GstVideoFormat format;
/* our caps system handles 24/32bpp RGB as big-endian. */
if ((bpp == 24 || bpp == 32) && endianness == G_LITTLE_ENDIAN) {
red_mask = GUINT32_TO_BE (red_mask);
green_mask = GUINT32_TO_BE (green_mask);
blue_mask = GUINT32_TO_BE (blue_mask);
endianness = G_BIG_ENDIAN;
if (bpp == 24) {
red_mask >>= 8;
green_mask >>= 8;
blue_mask >>= 8;
}
}
if (depth == 30 && bpp == 32) {
format = GST_VIDEO_FORMAT_r210;
} else if (depth == 24 && bpp == 32) {
format = gst_video_format_from_rgb32_masks (red_mask, green_mask,
blue_mask);
} else if (depth == 32 && bpp == 32 && alpha_mask) {
format = gst_video_format_from_rgba32_masks (red_mask, green_mask,
blue_mask, alpha_mask);
} else if (depth == 24 && bpp == 24) {
format = gst_video_format_from_rgb24_masks (red_mask, green_mask,
blue_mask);
} else if ((depth == 15 || depth == 16) && bpp == 16 &&
endianness == G_BYTE_ORDER) {
format = gst_video_format_from_rgb16_masks (red_mask, green_mask,
blue_mask);
} else if (depth == 8 && bpp == 8) {
format = GST_VIDEO_FORMAT_RGB8_PALETTED;
} else if (depth == 64 && bpp == 64) {
format = gst_video_format_from_rgba32_masks (red_mask, green_mask,
blue_mask, alpha_mask);
if (format == GST_VIDEO_FORMAT_ARGB) {
format = GST_VIDEO_FORMAT_ARGB64;
} else {
format = GST_VIDEO_FORMAT_UNKNOWN;
}
} else {
format = GST_VIDEO_FORMAT_UNKNOWN;
}
return format;
}
/**
* gst_video_format_from_fourcc:
* @fourcc: a FOURCC value representing raw YUV video
*
* Converts a FOURCC value into the corresponding #GstVideoFormat.
* If the FOURCC cannot be represented by #GstVideoFormat,
* #GST_VIDEO_FORMAT_UNKNOWN is returned.
*
* Since: 0.10.16
*
* Returns: the #GstVideoFormat describing the FOURCC value
*/
GstVideoFormat
gst_video_format_from_fourcc (guint32 fourcc)
{
switch (fourcc) {
case GST_MAKE_FOURCC ('I', '4', '2', '0'):
return GST_VIDEO_FORMAT_I420;
case GST_MAKE_FOURCC ('Y', 'V', '1', '2'):
return GST_VIDEO_FORMAT_YV12;
case GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'):
return GST_VIDEO_FORMAT_YUY2;
case GST_MAKE_FOURCC ('Y', 'V', 'Y', 'U'):
return GST_VIDEO_FORMAT_YVYU;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y'):
return GST_VIDEO_FORMAT_UYVY;
case GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'):
return GST_VIDEO_FORMAT_AYUV;
case GST_MAKE_FOURCC ('Y', '4', '1', 'B'):
return GST_VIDEO_FORMAT_Y41B;
case GST_MAKE_FOURCC ('Y', '4', '2', 'B'):
return GST_VIDEO_FORMAT_Y42B;
case GST_MAKE_FOURCC ('Y', '4', '4', '4'):
return GST_VIDEO_FORMAT_Y444;
case GST_MAKE_FOURCC ('v', '2', '1', '0'):
return GST_VIDEO_FORMAT_v210;
case GST_MAKE_FOURCC ('v', '2', '1', '6'):
return GST_VIDEO_FORMAT_v216;
case GST_MAKE_FOURCC ('N', 'V', '1', '2'):
return GST_VIDEO_FORMAT_NV12;
case GST_MAKE_FOURCC ('N', 'V', '2', '1'):
return GST_VIDEO_FORMAT_NV21;
case GST_MAKE_FOURCC ('v', '3', '0', '8'):
return GST_VIDEO_FORMAT_v308;
case GST_MAKE_FOURCC ('Y', '8', '0', '0'):
case GST_MAKE_FOURCC ('Y', '8', ' ', ' '):
case GST_MAKE_FOURCC ('G', 'R', 'E', 'Y'):
return GST_VIDEO_FORMAT_Y800;
case GST_MAKE_FOURCC ('Y', '1', '6', ' '):
return GST_VIDEO_FORMAT_Y16;
case GST_MAKE_FOURCC ('U', 'Y', 'V', 'P'):
return GST_VIDEO_FORMAT_UYVP;
case GST_MAKE_FOURCC ('A', '4', '2', '0'):
return GST_VIDEO_FORMAT_A420;
case GST_MAKE_FOURCC ('Y', 'U', 'V', '9'):
return GST_VIDEO_FORMAT_YUV9;
case GST_MAKE_FOURCC ('Y', 'V', 'U', '9'):
return GST_VIDEO_FORMAT_YVU9;
case GST_MAKE_FOURCC ('I', 'Y', 'U', '1'):
return GST_VIDEO_FORMAT_IYU1;
case GST_MAKE_FOURCC ('A', 'Y', '6', '4'):
return GST_VIDEO_FORMAT_AYUV64;
default:
return GST_VIDEO_FORMAT_UNKNOWN;
}
}
/**
* gst_video_format_from_string:
* @format: a format string
*
* Convert the @format string to its #GstVideoFormat.
*
* Returns: the #GstVideoFormat for @format or GST_VIDEO_FORMAT_UNKNOWN when the
* string is not a known format.
*/
GstVideoFormat
gst_video_format_from_string (const gchar * format)
{
guint i;
for (i = 0; i < G_N_ELEMENTS (formats); i++) {
if (strcmp (GST_VIDEO_FORMAT_INFO_NAME (&formats[i].info), format) == 0)
return GST_VIDEO_FORMAT_INFO_FORMAT (&formats[i].info);
}
return GST_VIDEO_FORMAT_UNKNOWN;
}
/**
* gst_video_format_to_fourcc:
* @format: a #GstVideoFormat video format
*
* Converts a #GstVideoFormat value into the corresponding FOURCC. Only
* a few YUV formats have corresponding FOURCC values. If @format has
* no corresponding FOURCC value, 0 is returned.
*
* Since: 0.10.16
*
* Returns: the FOURCC corresponding to @format
*/
guint32
gst_video_format_to_fourcc (GstVideoFormat format)
{
g_return_val_if_fail (format != GST_VIDEO_FORMAT_UNKNOWN, 0);
if (format >= G_N_ELEMENTS (formats))
return 0;
return formats[format].fourcc;
}
const gchar *
gst_video_format_to_string (GstVideoFormat format)
{
g_return_val_if_fail (format != GST_VIDEO_FORMAT_UNKNOWN, NULL);
if (format >= G_N_ELEMENTS (formats))
return NULL;
return GST_VIDEO_FORMAT_INFO_NAME (&formats[format].info);
}
/**
* gst_video_format_get_info:
* @format: a #GstVideoFormat
*
* Get the #GstVideoFormatInfo for @format
*
* Returns: The #GstVideoFormatInfo for @format.
*/
const GstVideoFormatInfo *
gst_video_format_get_info (GstVideoFormat format)
{
g_return_val_if_fail (format != GST_VIDEO_FORMAT_UNKNOWN, NULL);
g_return_val_if_fail (format < G_N_ELEMENTS (formats), NULL);
return &formats[format].info;
}
/**
* gst_video_info_init:
* @info: a #GstVideoInfo
*
* Initialize @info with default values.
*/
void
gst_video_info_init (GstVideoInfo * info)
{
g_return_if_fail (info != NULL);
memset (info, 0, sizeof (GstVideoInfo));
/* arrange for sensible defaults, e.g. if turned into caps */
info->fps_n = 0;
info->fps_d = 1;
info->par_n = 1;
info->par_d = 1;
}
/**
* gst_video_info_set_format:
* @info: a #GstVideoInfo
* @format: the format
* @width: a width
* @height: a height
*
* Set the default info for a video frame of @format and @width and @height.
*/
void
gst_video_info_set_format (GstVideoInfo * info, GstVideoFormat format,
guint width, guint height)
{
const GstVideoFormatInfo *finfo;
g_return_if_fail (info != NULL);
g_return_if_fail (format != GST_VIDEO_FORMAT_UNKNOWN);
finfo = &formats[format].info;
info->flags = 0;
info->finfo = finfo;
info->width = width;
info->height = height;
fill_planes (info);
}
/**
* gst_video_info_from_caps:
* @info: a #GstVideoInfo
* @caps: a #GstCaps
*
* Parse @caps and update @info.
*
* Returns: TRUE if @caps could be parsed
*/
gboolean
gst_video_info_from_caps (GstVideoInfo * info, const GstCaps * caps)
{
GstStructure *structure;
const gchar *s;
GstVideoFormat format;
gint width, height;
gint fps_n, fps_d;
gboolean interlaced;
gint par_n, par_d;
g_return_val_if_fail (info != NULL, FALSE);
g_return_val_if_fail (caps != NULL, FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
GST_DEBUG ("parsing caps %" GST_PTR_FORMAT, caps);
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_has_name (structure, "video/x-raw"))
goto wrong_name;
if (!(s = gst_structure_get_string (structure, "format")))
goto no_format;
format = gst_video_format_from_string (s);
if (format == GST_VIDEO_FORMAT_UNKNOWN)
goto unknown_format;
if (!gst_structure_get_int (structure, "width", &width))
goto no_width;
if (!gst_structure_get_int (structure, "height", &height))
goto no_height;
gst_video_info_set_format (info, format, width, height);
if (gst_structure_get_fraction (structure, "framerate", &fps_n, &fps_d)) {
info->fps_n = fps_n;
info->fps_d = fps_d;
} else {
info->fps_n = 0;
info->fps_d = 1;
}
if (!gst_structure_get_boolean (structure, "interlaced", &interlaced))
interlaced = FALSE;
if (interlaced)
info->flags |= GST_VIDEO_FLAG_INTERLACED;
else
info->flags &= ~GST_VIDEO_FLAG_INTERLACED;
s = gst_structure_get_string (structure, "color-matrix");
if (s)
info->color_matrix = s;
else
info->color_matrix = "sdtv";
s = gst_structure_get_string (structure, "chroma-site");
if (s)
info->chroma_site = s;
else
info->chroma_site = "mpeg2";
if (gst_structure_get_fraction (structure, "pixel-aspect-ratio",
&par_n, &par_d)) {
info->par_n = par_n;
info->par_d = par_d;
} else {
info->par_n = 1;
info->par_d = 1;
}
return TRUE;
/* ERROR */
wrong_name:
{
GST_ERROR ("wrong name, expected video/x-raw");
return FALSE;
}
no_format:
{
GST_ERROR ("no format given");
return FALSE;
}
unknown_format:
{
GST_ERROR ("unknown format given");
return FALSE;
}
no_width:
{
GST_ERROR ("no width property given");
return FALSE;
}
no_height:
{
GST_ERROR ("no height property given");
return FALSE;
}
}
/**
* gst_video_info_to_caps:
* @info: a #GstVideoInfo
*
* Convert the values of @info into a #GstCaps.
*
* Returns: a new #GstCaps containing the info of @info.
*/
GstCaps *
gst_video_info_to_caps (GstVideoInfo * info)
{
GstCaps *caps;
const gchar *format;
g_return_val_if_fail (info != NULL, NULL);
g_return_val_if_fail (info->finfo != NULL, NULL);
g_return_val_if_fail (info->finfo->format != GST_VIDEO_FORMAT_UNKNOWN, NULL);
format = gst_video_format_to_string (info->finfo->format);
g_return_val_if_fail (format != NULL, NULL);
caps = gst_caps_new_simple ("video/x-raw",
"format", G_TYPE_STRING, format,
"width", G_TYPE_INT, info->width,
"height", G_TYPE_INT, info->height,
"framerate", GST_TYPE_FRACTION, info->fps_n, info->fps_d,
"pixel-aspect-ratio", GST_TYPE_FRACTION, info->par_n, info->par_d, NULL);
if (info->flags & GST_VIDEO_FLAG_INTERLACED)
gst_caps_set_simple (caps, "interlaced", G_TYPE_BOOLEAN, TRUE, NULL);
if (info->color_matrix)
gst_caps_set_simple (caps, "color-matrix", G_TYPE_STRING,
info->color_matrix, NULL);
if (info->chroma_site)
gst_caps_set_simple (caps, "chroma-site", G_TYPE_STRING, info->chroma_site,
NULL);
return caps;
}
/**
* gst_video_frame_map:
* @frame: pointer to #GstVideoFrame
* @info: a #GstVideoInfo
* @buffer: the buffer to map
*
* Use @info and @buffer to fill in the values of @frame.
*
* All video planes of @buffer will be mapped and the pointers will be set in
* @frame->data.
*
* Returns: %TRUE on success.
*/
gboolean
gst_video_frame_map (GstVideoFrame * frame, GstVideoInfo * info,
GstBuffer * buffer, GstMapFlags flags)
{
GstMetaVideo *meta;
guint8 *data;
gsize size;
gint i;
g_return_val_if_fail (frame != NULL, FALSE);
g_return_val_if_fail (info != NULL, FALSE);
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
frame->buffer = buffer;
meta = gst_buffer_get_meta_video (buffer);
frame->meta = meta;
if (meta) {
frame->info.flags = meta->flags;
frame->info.finfo = &formats[meta->format].info;
frame->info.width = meta->width;
frame->info.height = meta->height;
for (i = 0; i < info->finfo->n_planes; i++) {
frame->data[i] =
gst_meta_video_map (meta, i, &frame->info.stride[i], flags);
}
} else {
/* copy the info */
frame->info = *info;
data = gst_buffer_map (buffer, &size, NULL, flags);
/* do some sanity checks */
if (size < info->size)
goto invalid_size;
/* set up pointers */
for (i = 0; i < info->finfo->n_planes; i++) {
frame->data[i] = data + info->offset[i];
}
}
return TRUE;
/* ERRORS */
invalid_size:
{
GST_ERROR ("invalid buffer size");
gst_buffer_unmap (buffer, data, size);
return FALSE;
}
}
/**
* gst_video_frame_unmap:
* @frame: a #GstVideoFrame
*
* Unmap the memory previously mapped with gst_video_frame_map.
*/
void
gst_video_frame_unmap (GstVideoFrame * frame)
{
GstBuffer *buffer;
GstMetaVideo *meta;
gint i;
g_return_if_fail (frame != NULL);
buffer = frame->buffer;
meta = frame->meta;
if (meta) {
for (i = 0; i < frame->info.finfo->n_planes; i++) {
gst_meta_video_unmap (meta, i, frame->data[i]);
}
} else {
guint8 *data;
data = frame->data[0];
data -= frame->info.offset[0];
gst_buffer_unmap (buffer, data, -1);
}
}
/**
* gst_video_frame_copy:
* @dest: a #GstVideoFrame
* @src: a #GstVideoFrame
*
* Copy the contents from @src to @dest.
*
* Returns: TRUE if the contents could be copied.
*/
gboolean
gst_video_frame_copy (GstVideoFrame * dest, const GstVideoFrame * src)
{
guint i, n_planes;
const GstVideoInfo *sinfo;
GstVideoInfo *dinfo;
sinfo = &src->info;
dinfo = &dest->info;
g_return_val_if_fail (dinfo->finfo->format == sinfo->finfo->format, FALSE);
g_return_val_if_fail (dinfo->width == sinfo->width
&& dinfo->height == sinfo->height, FALSE);
n_planes = dinfo->finfo->n_planes;
for (i = 0; i < n_planes; i++) {
guint w, h, j;
guint8 *sp, *dp;
gint ss, ds;
sp = src->data[i];
dp = dest->data[i];
ss = sinfo->stride[i];
ds = dinfo->stride[i];
w = MIN (ABS (ss), ABS (ds));
h = GST_VIDEO_FRAME_COMP_HEIGHT (dest, i);
GST_DEBUG ("w %d h %d", w, h);
for (j = 0; j < h; j++) {
memcpy (dp, sp, w);
dp += ds;
sp += ss;
}
}
return TRUE;
}
static int
fill_planes (GstVideoInfo * info)
{
gint width, height;
width = info->width;
height = info->height;
switch (info->finfo->format) {
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_YVYU:
case GST_VIDEO_FORMAT_UYVY:
info->stride[0] = GST_ROUND_UP_4 (width * 2);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_r210:
info->stride[0] = width * 4;
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_RGB16:
case GST_VIDEO_FORMAT_BGR16:
case GST_VIDEO_FORMAT_RGB15:
case GST_VIDEO_FORMAT_BGR15:
info->stride[0] = GST_ROUND_UP_4 (width * 2);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
case GST_VIDEO_FORMAT_v308:
info->stride[0] = GST_ROUND_UP_4 (width * 3);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_v210:
info->stride[0] = ((width + 47) / 48) * 128;
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_v216:
info->stride[0] = GST_ROUND_UP_8 (width * 4);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_GRAY8:
case GST_VIDEO_FORMAT_Y800:
info->stride[0] = GST_ROUND_UP_4 (width);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_GRAY16_BE:
case GST_VIDEO_FORMAT_GRAY16_LE:
case GST_VIDEO_FORMAT_Y16:
info->stride[0] = GST_ROUND_UP_4 (width * 2);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_UYVP:
info->stride[0] = GST_ROUND_UP_4 ((width * 2 * 5 + 3) / 4);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_RGB8_PALETTED:
info->stride[0] = GST_ROUND_UP_4 (width);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_IYU1:
info->stride[0] = GST_ROUND_UP_4 (GST_ROUND_UP_4 (width) +
GST_ROUND_UP_4 (width) / 2);
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_ARGB64:
case GST_VIDEO_FORMAT_AYUV64:
info->stride[0] = width * 8;
info->offset[0] = 0;
info->size = info->stride[0] * height;
break;
case GST_VIDEO_FORMAT_I420:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2);
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * GST_ROUND_UP_2 (height);
info->offset[2] = info->offset[1] +
info->stride[1] * (GST_ROUND_UP_2 (height) / 2);
info->size = info->offset[2] +
info->stride[2] * (GST_ROUND_UP_2 (height) / 2);
break;
case GST_VIDEO_FORMAT_YV12: /* same as I420, but plane 1+2 swapped */
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2);
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[2] = info->stride[0] * GST_ROUND_UP_2 (height);
info->offset[1] = info->offset[2] +
info->stride[1] * (GST_ROUND_UP_2 (height) / 2);
info->size = info->offset[1] +
info->stride[2] * (GST_ROUND_UP_2 (height) / 2);
break;
case GST_VIDEO_FORMAT_Y41B:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_16 (width) / 4;
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * height;
info->offset[2] = info->offset[1] + info->stride[1] * height;
/* simplification of ROUNDUP4(w)*h + 2*((ROUNDUP16(w)/4)*h */
info->size = (info->stride[0] + (GST_ROUND_UP_16 (width) / 2)) * height;
break;
case GST_VIDEO_FORMAT_Y42B:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_8 (width) / 2;
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * height;
info->offset[2] = info->offset[1] + info->stride[1] * height;
/* simplification of ROUNDUP4(w)*h + 2*(ROUNDUP8(w)/2)*h */
info->size = (info->stride[0] + GST_ROUND_UP_8 (width)) * height;
break;
case GST_VIDEO_FORMAT_Y444:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = info->stride[0];
info->stride[2] = info->stride[0];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * height;
info->offset[2] = info->offset[1] * 2;
info->size = info->stride[0] * height * 3;
break;
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV21:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = info->stride[0];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * GST_ROUND_UP_2 (height);
info->size = info->stride[0] * GST_ROUND_UP_2 (height) * 3 / 2;
break;
case GST_VIDEO_FORMAT_A420:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2);
info->stride[2] = info->stride[1];
info->stride[3] = info->stride[0];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * GST_ROUND_UP_2 (height);
info->offset[2] = info->offset[1] +
info->stride[1] * (GST_ROUND_UP_2 (height) / 2);
info->offset[3] = info->offset[2] +
info->stride[2] * (GST_ROUND_UP_2 (height) / 2);
info->size = info->offset[3] + info->stride[0];
break;
case GST_VIDEO_FORMAT_YUV9:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_4 (GST_ROUND_UP_4 (width) / 4);
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[1] = info->stride[0] * height;
info->offset[2] = info->offset[1] +
info->stride[1] * (GST_ROUND_UP_4 (height) / 4);
info->size = info->offset[2] +
info->stride[2] * (GST_ROUND_UP_4 (height) / 4);
break;
case GST_VIDEO_FORMAT_YVU9:
info->stride[0] = GST_ROUND_UP_4 (width);
info->stride[1] = GST_ROUND_UP_4 (GST_ROUND_UP_4 (width) / 4);
info->stride[2] = info->stride[1];
info->offset[0] = 0;
info->offset[2] = info->stride[0] * height;
info->offset[1] = info->offset[2] +
info->stride[1] * (GST_ROUND_UP_4 (height) / 4);
info->size = info->offset[2] +
info->stride[2] * (GST_ROUND_UP_4 (height) / 4);
break;
case GST_VIDEO_FORMAT_UNKNOWN:
GST_ERROR ("invalid format");
g_warning ("invalid format");
break;
}
return 0;
}
/**
* gst_video_format_convert:
* @info: a #GstVideoInfo
* @src_format: #GstFormat of the @src_value
* @src_value: value to convert
* @dest_format: #GstFormat of the @dest_value
* @dest_value: pointer to destination value
*
* Converts among various #GstFormat types. This function handles
* GST_FORMAT_BYTES, GST_FORMAT_TIME, and GST_FORMAT_DEFAULT. For
* raw video, GST_FORMAT_DEFAULT corresponds to video frames. This
* function can be used to handle pad queries of the type GST_QUERY_CONVERT.
*
* Since: 0.10.16
*
* Returns: TRUE if the conversion was successful.
*/
gboolean
gst_video_info_convert (GstVideoInfo * info,
GstFormat src_format, gint64 src_value,
GstFormat dest_format, gint64 * dest_value)
{
gboolean ret = FALSE;
int size, fps_n, fps_d;
g_return_val_if_fail (info != NULL, 0);
g_return_val_if_fail (info->finfo != NULL, 0);
g_return_val_if_fail (info->finfo->format != GST_VIDEO_FORMAT_UNKNOWN, 0);
g_return_val_if_fail (info->size > 0, 0);
size = info->size;
fps_n = info->fps_n;
fps_d = info->fps_d;
GST_DEBUG ("converting value %" G_GINT64_FORMAT " from %s to %s",
src_value, gst_format_get_name (src_format),
gst_format_get_name (dest_format));
if (src_format == dest_format) {
*dest_value = src_value;
ret = TRUE;
goto done;
}
if (src_value == -1) {
*dest_value = -1;
ret = TRUE;
goto done;
}
/* bytes to frames */
if (src_format == GST_FORMAT_BYTES && dest_format == GST_FORMAT_DEFAULT) {
if (size != 0) {
*dest_value = gst_util_uint64_scale_int (src_value, 1, size);
} else {
GST_ERROR ("blocksize is 0");
*dest_value = 0;
}
ret = TRUE;
goto done;
}
/* frames to bytes */
if (src_format == GST_FORMAT_DEFAULT && dest_format == GST_FORMAT_BYTES) {
*dest_value = gst_util_uint64_scale_int (src_value, size, 1);
ret = TRUE;
goto done;
}
/* time to frames */
if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_DEFAULT) {
if (fps_d != 0) {
*dest_value = gst_util_uint64_scale (src_value,
fps_n, GST_SECOND * fps_d);
} else {
GST_ERROR ("framerate denominator is 0");
*dest_value = 0;
}
ret = TRUE;
goto done;
}
/* frames to time */
if (src_format == GST_FORMAT_DEFAULT && dest_format == GST_FORMAT_TIME) {
if (fps_n != 0) {
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * fps_d, fps_n);
} else {
GST_ERROR ("framerate numerator is 0");
*dest_value = 0;
}
ret = TRUE;
goto done;
}
/* time to bytes */
if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
if (fps_d != 0) {
*dest_value = gst_util_uint64_scale (src_value,
fps_n * size, GST_SECOND * fps_d);
} else {
GST_ERROR ("framerate denominator is 0");
*dest_value = 0;
}
ret = TRUE;
goto done;
}
/* bytes to time */
if (src_format == GST_FORMAT_BYTES && dest_format == GST_FORMAT_TIME) {
if (fps_n != 0 && size != 0) {
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * fps_d, fps_n * size);
} else {
GST_ERROR ("framerate denominator and/or blocksize is 0");
*dest_value = 0;
}
ret = TRUE;
}
done:
GST_DEBUG ("ret=%d result %" G_GINT64_FORMAT, ret, *dest_value);
return ret;
}
#define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
/**
* gst_video_event_new_still_frame:
* @in_still: boolean value for the still-frame state of the event.
*
* Creates a new Still Frame event. If @in_still is %TRUE, then the event
* represents the start of a still frame sequence. If it is %FALSE, then
* the event ends a still frame sequence.
*
* To parse an event created by gst_video_event_new_still_frame() use
* gst_video_event_parse_still_frame().
*
* Returns: The new GstEvent
* Since: 0.10.26
*/
GstEvent *
gst_video_event_new_still_frame (gboolean in_still)
{
GstEvent *still_event;
GstStructure *s;
s = gst_structure_new (GST_VIDEO_EVENT_STILL_STATE_NAME,
"still-state", G_TYPE_BOOLEAN, in_still, NULL);
still_event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
return still_event;
}
/**
* gst_video_event_parse_still_frame:
* @event: A #GstEvent to parse
* @in_still: A boolean to receive the still-frame status from the event, or NULL
*
* Parse a #GstEvent, identify if it is a Still Frame event, and
* return the still-frame state from the event if it is.
* If the event represents the start of a still frame, the in_still
* variable will be set to TRUE, otherwise FALSE. It is OK to pass NULL for the
* in_still variable order to just check whether the event is a valid still-frame
* event.
*
* Create a still frame event using gst_video_event_new_still_frame()
*
* Returns: %TRUE if the event is a valid still-frame event. %FALSE if not
* Since: 0.10.26
*/
gboolean
gst_video_event_parse_still_frame (GstEvent * event, gboolean * in_still)
{
const GstStructure *s;
gboolean ev_still_state;
g_return_val_if_fail (event != NULL, FALSE);
if (GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_DOWNSTREAM)
return FALSE; /* Not a still frame event */
s = gst_event_get_structure (event);
if (s == NULL
|| !gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME))
return FALSE; /* Not a still frame event */
if (!gst_structure_get_boolean (s, "still-state", &ev_still_state))
return FALSE; /* Not a still frame event */
if (in_still)
*in_still = ev_still_state;
return TRUE;
}
/**
* gst_video_parse_caps_framerate:
* @caps: pointer to a #GstCaps instance
* @fps_n: pointer to integer to hold numerator of frame rate (output)
* @fps_d: pointer to integer to hold denominator of frame rate (output)
*
* Extracts the frame rate from @caps and places the values in the locations
* pointed to by @fps_n and @fps_d. Returns TRUE if the values could be
* parsed correctly, FALSE if not.
*
* This function can be used with #GstCaps that have any media type; it
* is not limited to formats handled by #GstVideoFormat.
*
* Since: 0.10.16
*
* Returns: TRUE if @caps was parsed correctly.
*/
gboolean
gst_video_parse_caps_framerate (GstCaps * caps, int *fps_n, int *fps_d)
{
GstStructure *structure;
if (!gst_caps_is_fixed (caps))
return FALSE;
structure = gst_caps_get_structure (caps, 0);
return gst_structure_get_fraction (structure, "framerate", fps_n, fps_d);
}
/**
* gst_video_parse_caps_palette:
* @caps: #GstCaps to parse
*
* Returns the palette data from the caps as a #GstBuffer. For
* #GST_VIDEO_FORMAT_RGB8_PALETTED this is containing 256 #guint32
* values, each containing ARGB colors in native endianness.
*
* Returns: a #GstBuffer containing the palette data. Unref after usage.
* Since: 0.10.32
*/
GstBuffer *
gst_video_parse_caps_palette (GstCaps * caps)
{
GstStructure *s;
const GValue *p_v;
GstBuffer *p;
if (!gst_caps_is_fixed (caps))
return NULL;
s = gst_caps_get_structure (caps, 0);
p_v = gst_structure_get_value (s, "palette_data");
if (!p_v || !GST_VALUE_HOLDS_BUFFER (p_v))
return NULL;
p = gst_buffer_ref (gst_value_get_buffer (p_v));
return p;
}
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