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gstreamer/gst-libs/gst/video/video.c
David Schleef d605ca3ba2 gst-libs/gst/video/video.*: Add additional RGBA and RGB-24 video formats. 
Original commit message from CVS:
* gst-libs/gst/video/video.c:
* gst-libs/gst/video/video.h:
Add additional RGBA and RGB-24 video formats.
2007-12-22 05:19:00 +00:00

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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 "video.h"
/**
* 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>
*/
static GstVideoFormat gst_video_format_from_rgb32_masks (int red_mask,
int green_mask, int blue_mask);
static GstVideoFormat gst_video_format_from_rgba32_masks (int red_mask,
int green_mask, int blue_mask, int alpha_mask);
static GstVideoFormat gst_video_format_from_rgb24_masks (int red_mask,
int green_mask, int blue_mask);
/* This is simply a convenience function, nothing more or less */
const GValue *
gst_video_frame_rate (GstPad * pad)
{
const GValue *fps;
gchar *fps_string;
const GstCaps *caps = NULL;
GstStructure *structure;
/* get pad caps */
caps = GST_PAD_CAPS (pad);
if (caps == NULL) {
g_warning ("gstvideo: failed to get caps of pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
return NULL;
}
structure = gst_caps_get_structure (caps, 0);
if ((fps = gst_structure_get_value (structure, "framerate")) == NULL) {
g_warning ("gstvideo: failed to get framerate property of pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
return NULL;
}
if (!GST_VALUE_HOLDS_FRACTION (fps)) {
g_warning
("gstvideo: framerate property of pad %s:%s is not of type Fraction",
GST_DEBUG_PAD_NAME (pad));
return NULL;
}
fps_string = gst_value_serialize (fps);
GST_DEBUG ("Framerate request on pad %s:%s: %s",
GST_DEBUG_PAD_NAME (pad), fps_string);
g_free (fps_string);
return fps;
}
gboolean
gst_video_get_size (GstPad * pad, gint * width, gint * height)
{
const GstCaps *caps = NULL;
GstStructure *structure;
gboolean ret;
g_return_val_if_fail (pad != NULL, FALSE);
g_return_val_if_fail (width != NULL, FALSE);
g_return_val_if_fail (height != NULL, FALSE);
caps = GST_PAD_CAPS (pad);
if (caps == NULL) {
g_warning ("gstvideo: failed to get caps of pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
return FALSE;
}
structure = gst_caps_get_structure (caps, 0);
ret = gst_structure_get_int (structure, "width", width);
ret &= gst_structure_get_int (structure, "height", height);
if (!ret) {
g_warning ("gstvideo: failed to get size properties on pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
return FALSE;
}
GST_DEBUG ("size request on pad %s:%s: %dx%d",
GST_DEBUG_PAD_NAME (pad), width ? *width : -1, height ? *height : -1);
return TRUE;
}
/**
* 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;
GValue display_ratio = { 0, };
GValue tmp = { 0, };
GValue tmp2 = { 0, };
g_return_val_if_fail (dar_n != NULL, FALSE);
g_return_val_if_fail (dar_d != NULL, FALSE);
g_value_init (&display_ratio, GST_TYPE_FRACTION);
g_value_init (&tmp, GST_TYPE_FRACTION);
g_value_init (&tmp2, GST_TYPE_FRACTION);
/* Calculate (video_width * video_par_n * display_par_d) /
* (video_height * video_par_d * display_par_n) */
gst_value_set_fraction (&display_ratio, video_width, video_height);
gst_value_set_fraction (&tmp, video_par_n, video_par_d);
if (!gst_value_fraction_multiply (&tmp2, &display_ratio, &tmp))
goto error_overflow;
gst_value_set_fraction (&tmp, display_par_d, display_par_n);
if (!gst_value_fraction_multiply (&display_ratio, &tmp2, &tmp))
goto error_overflow;
num = gst_value_get_fraction_numerator (&display_ratio);
den = gst_value_get_fraction_denominator (&display_ratio);
g_value_unset (&display_ratio);
g_value_unset (&tmp);
g_value_unset (&tmp2);
g_return_val_if_fail (num > 0, FALSE);
g_return_val_if_fail (den > 0, FALSE);
*dar_n = num;
*dar_d = den;
return TRUE;
error_overflow:
g_value_unset (&display_ratio);
g_value_unset (&tmp);
g_value_unset (&tmp2);
return FALSE;
}
/**
* gst_video_format_parse_caps:
* @caps: the #GstCaps to parse
* @format: the #GstVideoFormat of the video represented by @caps (output)
* @width: the width of the video represented by @caps (output)
* @height: the height of the video represented by @caps (output)
*
* Determines the #GstVideoFormat of @caps and places it in the location
* pointed to by @format. Extracts the size of the video and places it
* in the location pointed to by @width and @height. If @caps does not
* reprsent one of the raw video formats listed in #GstVideoFormat, the
* function will fail and return FALSE.
*
* Since: 0.10.16
*
* Returns: TRUE if @caps was parsed correctly.
*/
gboolean
gst_video_format_parse_caps (GstCaps * caps, GstVideoFormat * format,
int *width, int *height)
{
GstStructure *structure;
gboolean ok = TRUE;
if (!gst_caps_is_fixed (caps))
return FALSE;
structure = gst_caps_get_structure (caps, 0);
if (format) {
if (gst_structure_has_name (structure, "video/x-raw-yuv")) {
guint32 fourcc;
ok &= gst_structure_get_fourcc (structure, "format", &fourcc);
*format = gst_video_format_from_fourcc (fourcc);
if (*format == GST_VIDEO_FORMAT_UNKNOWN) {
ok = FALSE;
}
} else if (gst_structure_has_name (structure, "video/x-raw-rgb")) {
int depth;
int bpp;
int endianness;
int red_mask;
int green_mask;
int blue_mask;
int alpha_mask;
gboolean have_alpha;
ok &= gst_structure_get_int (structure, "depth", &depth);
ok &= gst_structure_get_int (structure, "bpp", &bpp);
ok &= gst_structure_get_int (structure, "endianness", &endianness);
ok &= gst_structure_get_int (structure, "red_mask", &red_mask);
ok &= gst_structure_get_int (structure, "green_mask", &green_mask);
ok &= gst_structure_get_int (structure, "blue_mask", &blue_mask);
have_alpha = gst_structure_get_int (structure, "alpha_mask", &alpha_mask);
if (depth == 24 && bpp == 32 && endianness == G_BIG_ENDIAN) {
*format = gst_video_format_from_rgb32_masks (red_mask, green_mask,
blue_mask);
if (*format == GST_VIDEO_FORMAT_UNKNOWN) {
ok = FALSE;
}
} else if (depth == 24 && bpp == 32 && endianness == G_BIG_ENDIAN &&
have_alpha) {
*format = gst_video_format_from_rgba32_masks (red_mask, green_mask,
blue_mask, alpha_mask);
if (*format == GST_VIDEO_FORMAT_UNKNOWN) {
ok = FALSE;
}
} else if (depth == 24 && bpp == 24 && endianness == G_BIG_ENDIAN) {
*format = gst_video_format_from_rgb24_masks (red_mask, green_mask,
blue_mask);
if (*format == GST_VIDEO_FORMAT_UNKNOWN) {
ok = FALSE;
}
} else {
ok = FALSE;
}
} else {
ok = FALSE;
}
}
if (width) {
ok &= gst_structure_get_int (structure, "width", width);
}
if (height) {
ok &= gst_structure_get_int (structure, "height", height);
}
return ok;
}
/**
* gst_video_parse_caps_framerate:
* @caps:
* @fps_n: pointer to numerator of frame rate (output)
* @fps_d: pointer to 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_pixel_aspect_ratio:
* @caps:
* @par_n: pointer to numerator of pixel aspect ratio (output)
* @par_d: pointer to denominator of pixel aspect ratio (output)
*
* Extracts the pixel aspect ratio from @caps and places the values in
* the locations pointed to by @par_n and @par_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_pixel_aspect_ratio (GstCaps * caps, int *par_n, int *par_d)
{
GstStructure *structure;
if (!gst_caps_is_fixed (caps))
return FALSE;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_fraction (structure, "pixel-aspect-ratio",
par_n, par_d)) {
*par_n = 1;
*par_d = 1;
}
return TRUE;
}
/**
* gst_video_format_new_caps:
* @format: the #GstVideoFormat describing the raw video format
* @width: width of video
* @height: height of video
* @framerate_n: numerator of frame rate
* @framerate_d: denominator of frame rate
* @par_n: numerator of pixel aspect ratio
* @par_d: denominator of pixel aspect ratio
*
* Creates a new #GstCaps object based on the parameters provided.
*
* Since: 0.10.16
*
* Returns: a new #GstCaps object, or NULL if there was an error
*/
GstCaps *
gst_video_format_new_caps (GstVideoFormat format, int width, int height,
int framerate_n, int framerate_d, int par_n, int par_d)
{
if (gst_video_format_is_yuv (format)) {
return gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, gst_video_format_to_fourcc (format),
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, framerate_n, framerate_d,
"pixel-aspect-ratio", GST_TYPE_FRACTION, par_n, par_d, NULL);
}
if (gst_video_format_is_rgb (format)) {
GstCaps *caps;
int red_mask;
int blue_mask;
int green_mask;
int alpha_mask;
int depth;
int bpp;
gboolean have_alpha;
unsigned int mask;
switch (format) {
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
bpp = 32;
depth = 24;
have_alpha = FALSE;
break;
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
bpp = 32;
depth = 32;
have_alpha = TRUE;
break;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
bpp = 24;
depth = 24;
have_alpha = FALSE;
break;
default:
return NULL;
}
if (bpp == 32) {
mask = 0xff000000;
} else {
mask = 0xff0000;
}
red_mask =
mask >> (8 * gst_video_format_get_component_offset (format, 0, width,
height));
green_mask =
mask >> (8 * gst_video_format_get_component_offset (format, 1, width,
height));
blue_mask =
mask >> (8 * gst_video_format_get_component_offset (format, 2, width,
height));
caps = gst_caps_new_simple ("video/x-raw-rgb",
"bpp", G_TYPE_INT, bpp,
"depth", G_TYPE_INT, depth,
"endianness", G_TYPE_INT, G_BIG_ENDIAN,
"red_mask", G_TYPE_INT, red_mask,
"green_mask", G_TYPE_INT, green_mask,
"blue_mask", G_TYPE_INT, blue_mask,
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
"framerate", GST_TYPE_FRACTION, framerate_n, framerate_d,
"pixel-aspect-ratio", GST_TYPE_FRACTION, par_n, par_d, NULL);
if (have_alpha) {
alpha_mask =
mask >> (8 * gst_video_format_get_component_offset (format, 3, width,
height));
gst_caps_set_simple (caps, "alpha_mask", G_TYPE_INT, alpha_mask, NULL);
}
return caps;
}
return NULL;
}
/**
* 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 ('U', 'Y', 'V', 'Y'):
return GST_VIDEO_FORMAT_UYVY;
case GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'):
return GST_VIDEO_FORMAT_AYUV;
default:
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)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
return GST_MAKE_FOURCC ('I', '4', '2', '0');
case GST_VIDEO_FORMAT_YV12:
return GST_MAKE_FOURCC ('Y', 'V', '1', '2');
case GST_VIDEO_FORMAT_YUY2:
return GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
case GST_VIDEO_FORMAT_UYVY:
return GST_MAKE_FOURCC ('U', 'Y', 'V', 'Y');
case GST_VIDEO_FORMAT_AYUV:
return GST_MAKE_FOURCC ('A', 'Y', 'U', 'V');
default:
return 0;
}
}
/**
* gst_video_format_from_rgb32_masks:
* @red_mask: red bit mask
* @green_mask: green bit mask
* @blue_mask: blue bit mask
*
* Converts red, green, blue bit masks into the corresponding
* #GstVideoFormat.
*
* Since: 0.10.16
*
* Returns: the #GstVideoFormat corresponding to the bit masks
*/
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 == 0x0000ff00 && alpha_mask == 0xff000000) {
return GST_VIDEO_FORMAT_ARGB;
}
if (red_mask == 0x000000ff && green_mask == 0x0000ff00 &&
blue_mask == 0xff000000 && 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;
}
/**
* gst_video_format_is_rgb:
* @format: a #GstVideoFormat
*
* Since: 0.10.16
*
* Returns: TRUE if @format represents RGB video
*/
gboolean
gst_video_format_is_rgb (GstVideoFormat format)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
case GST_VIDEO_FORMAT_AYUV:
return FALSE;
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return TRUE;
default:
return FALSE;
}
}
/**
* gst_video_format_is_yuv:
* @format: a #GstVideoFormat
*
* Since: 0.10.16
*
* Returns: TRUE if @format represents YUV video
*/
gboolean
gst_video_format_is_yuv (GstVideoFormat format)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
case GST_VIDEO_FORMAT_AYUV:
return TRUE;
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return FALSE;
default:
return FALSE;
}
}
/**
* gst_video_format_has_alpha:
* @format: a #GstVideoFormat
*
* Since: 0.10.16
*
* Returns: TRUE if @format has an alpha channel
*/
gboolean
gst_video_format_has_alpha (GstVideoFormat format)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
return FALSE;
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
return TRUE;
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return FALSE;
default:
return FALSE;
}
}
/**
* gst_video_format_get_row_stride:
* @format: a #GstVideoFormat
* @component: the component index
* @width: the width of video
*
* Calculates the row stride (number of bytes from one row of pixels to
* the next) for the video component with an index of @component. For
* YUV video, Y, U, and V have component indices of 0, 1, and 2,
* respectively. For RGB video, R, G, and B have component indicies of
* 0, 1, and 2, respectively. Alpha channels, if present, have a component
* index of 3. The @width parameter always represents the width of the
* video, not the component.
*
* Since: 0.10.16
*
* Returns: row stride of component @component
*/
int
gst_video_format_get_row_stride (GstVideoFormat format, int component,
int width)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
if (component == 0) {
return GST_ROUND_UP_4 (width);
} else {
return GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2);
}
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
return GST_ROUND_UP_4 (width * 2);
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
return width * 4;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return GST_ROUND_UP_4 (width * 3);
default:
return 0;
}
}
/**
* gst_video_format_get_pixel_stride:
* @format: a #GstVideoFormat
* @component: the component index
*
* Calculates the pixel stride (number of bytes from one pixel to the
* pixel to its immediate left) for the video component with an index
* of @component. See @gst_video_format_get_row_stride for a description
* of the component index.
*
* Since: 0.10.16
*
* Returns: pixel stride of component @component
*/
int
gst_video_format_get_pixel_stride (GstVideoFormat format, int component)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
return 1;
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
if (component == 0) {
return 2;
} else {
return 4;
}
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
return 4;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return 3;
default:
return 0;
}
}
/**
* gst_video_format_get_component_width:
* @format: a #GstVideoFormat
* @component: the component index
* @width: the width of video
*
* Calculates the width of the component. See
* @gst_video_format_get_row_stride for a description
* of the component index.
*
* Since: 0.10.16
*
* Returns: width of component @component
*/
int
gst_video_format_get_component_width (GstVideoFormat format, int component,
int width)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
if (component == 0) {
return width;
} else {
return GST_ROUND_UP_2 (width) / 2;
}
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return width;
default:
return 0;
}
}
/**
* gst_video_format_get_component_height:
* @format: a #GstVideoFormat
* @component: the component index
* @height: the height of video
*
* Calculates the height of the component. See
* @gst_video_format_get_row_stride for a description
* of the component index.
*
* Since: 0.10.16
*
* Returns: height of component @component
*/
int
gst_video_format_get_component_height (GstVideoFormat format, int component,
int height)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
if (component == 0) {
return height;
} else {
return GST_ROUND_UP_2 (height) / 2;
}
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return height;
default:
return 0;
}
}
/**
* gst_video_format_get_component_offset:
* @format: a #GstVideoFormat
* @component: the component index
* @width: the width of video
* @height: the height of video
*
* Calculates the offset (in bytes) of the first pixel of the component
* with index @component. For packed formats, this will typically be a
* small integer (0, 1, 2, 3). For planar formats, this will be a
* (relatively) large offset to the beginning of the second or third
* component planes. See @gst_video_format_get_row_stride for a description
* of the component index.
*
* Since: 0.10.16
*
* Returns: offset of component @component
*/
int
gst_video_format_get_component_offset (GstVideoFormat format, int component,
int width, int height)
{
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
if (component == 0) {
return 0;
} else {
int offset;
offset = GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height);
if (component == 2) {
offset += GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2) *
(GST_ROUND_UP_2 (height) / 2);
}
return offset;
}
case GST_VIDEO_FORMAT_YUY2:
if (component == 0)
return 0;
if (component == 1)
return 1;
if (component == 2)
return 3;
return 0;
case GST_VIDEO_FORMAT_UYVY:
if (component == 0)
return 1;
if (component == 1)
return 0;
if (component == 2)
return 2;
return 0;
case GST_VIDEO_FORMAT_AYUV:
if (component == 0)
return 1;
if (component == 1)
return 2;
if (component == 2)
return 3;
if (component == 3)
return 0;
return 0;
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_RGBA:
if (component == 0)
return 0;
if (component == 1)
return 1;
if (component == 2)
return 2;
if (component == 3)
return 3;
return 0;
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_BGRA:
if (component == 0)
return 2;
if (component == 1)
return 1;
if (component == 2)
return 0;
if (component == 3)
return 3;
return 0;
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_ARGB:
if (component == 0)
return 1;
if (component == 1)
return 2;
if (component == 2)
return 3;
if (component == 3)
return 0;
return 0;
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_ABGR:
if (component == 0)
return 3;
if (component == 1)
return 2;
if (component == 2)
return 1;
if (component == 3)
return 0;
return 0;
case GST_VIDEO_FORMAT_RGB:
if (component == 0)
return 0;
if (component == 1)
return 1;
if (component == 2)
return 2;
return 0;
case GST_VIDEO_FORMAT_BGR:
if (component == 0)
return 2;
if (component == 1)
return 1;
if (component == 2)
return 0;
return 0;
default:
return 0;
}
}
/**
* gst_video_format_get_size:
* @format: a #GstVideoFormat
* @width: the width of video
* @height: the height of video
*
* Calculates the total number of bytes in the raw video format. This
* number should be used when allocating a buffer for raw video.
*
* Since: 0.10.16
*
* Returns: size (in bytes) of raw video format
*/
int
gst_video_format_get_size (GstVideoFormat format, int width, int height)
{
int size;
switch (format) {
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
size = GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height);
size += GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2) *
(GST_ROUND_UP_2 (height) / 2) * 2;
return size;
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_UYVY:
return GST_ROUND_UP_4 (width * 2) * height;
case GST_VIDEO_FORMAT_AYUV:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
return width * 4 * height;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return GST_ROUND_UP_4 (width * 3) * height;
default:
return 0;
}
}
/**
* gst_video_format_convert:
* @format: a #GstVideoFormat
* @width: the width of video
* @height: the height of video
* @fps_n: frame rate numerator
* @fps_d: frame rate denominator
* @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 to handle pad queries of the type GST_QUERY_CONVERT.
*
* Since: 0.10.16
*
* Returns: TRUE if the conversion was successful.
*/
gboolean
gst_video_format_convert (GstVideoFormat format, int width, int height,
int fps_n, int fps_d,
GstFormat src_format, gint64 src_value,
GstFormat dest_format, gint64 * dest_value)
{
gboolean ret = FALSE;
int size;
size = gst_video_format_get_size (format, width, height);
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;
}
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