/* 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);

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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;

}

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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)

 *

 * 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

 * represent 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.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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 == 32 && 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:

 *

 * 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.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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:

 * @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.

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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

 */

#ifdef __SYMBIAN32__

EXPORT_C

#endif

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;