gstreamer/gst-libs/gst/vaapi/gstvaapiimage.c

/*
 *  gstvaapiimage.c - VA image abstraction
 *
 *  Copyright (C) 2010-2011 Splitted-Desktop Systems
 *  Copyright (C) 2011-2012 Intel Corporation
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2.1
 *  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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301 USA
 */

/**
 * SECTION:gstvaapiimage
 * @short_description: VA image abstraction
 */

#include "sysdeps.h"
#include <string.h>
#include "gstvaapicompat.h"
#include "gstvaapiutils.h"
#include "gstvaapiimage.h"
#include "gstvaapiobject_priv.h"

#define DEBUG 1
#include "gstvaapidebug.h"

typedef struct _GstVaapiImageClass              GstVaapiImageClass;

/**
 * GstVaapiImage:
 *
 * A VA image wrapper
 */
struct _GstVaapiImage {
    /*< private >*/
    GstVaapiObject      parent_instance;

    VAImage             internal_image;
    VAImage             image;
    guchar             *image_data;
    GstVideoFormat      internal_format;
    GstVideoFormat      format;
    guint               width;
    guint               height;
    guint               is_linear       : 1;
};

/**
 * GstVaapiImageClass:
 *
 * A VA image wrapper class
 */
struct _GstVaapiImageClass {
    /*< private >*/
    GstVaapiObjectClass parent_class;
};

#define SWAP_UINT(a, b) do { \
        guint v = a;         \
        a = b;               \
        b = v;               \
    } while (0)

static gboolean
_gst_vaapi_image_map(GstVaapiImage *image, GstVaapiImageRaw *raw_image);

static gboolean
_gst_vaapi_image_unmap(GstVaapiImage *image);

static gboolean
_gst_vaapi_image_set_image(GstVaapiImage *image, const VAImage *va_image);

/*
 * VAImage wrapper
 */

static gboolean
vaapi_image_is_linear(const VAImage *va_image)
{
    guint i, width, height, width2, height2, data_size;

    for (i = 1; i < va_image->num_planes; i++)
        if (va_image->offsets[i] < va_image->offsets[i - 1])
            return FALSE;

    width   = va_image->width;
    height  = va_image->height;
    width2  = (width  + 1) / 2;
    height2 = (height + 1) / 2;

    switch (va_image->format.fourcc) {
    case VA_FOURCC('N','V','1','2'):
    case VA_FOURCC('Y','V','1','2'):
    case VA_FOURCC('I','4','2','0'):
        data_size = width * height + 2 * width2 * height2;
        break;
    case VA_FOURCC('A','Y','U','V'):
    case VA_FOURCC('A','R','G','B'):
    case VA_FOURCC('R','G','B','A'):
    case VA_FOURCC('A','B','G','R'):
    case VA_FOURCC('B','G','R','A'):
        data_size = 4 * width * height;
        break;
    default:
        g_error("FIXME: incomplete formats");
        break;
    }
    return va_image->data_size == data_size;
}

static void
gst_vaapi_image_destroy(GstVaapiImage *image)
{
    GstVaapiDisplay * const display = GST_VAAPI_OBJECT_DISPLAY(image);
    VAImageID image_id;
    VAStatus status;

    _gst_vaapi_image_unmap(image);

    image_id = GST_VAAPI_OBJECT_ID(image);
    GST_DEBUG("image %" GST_VAAPI_ID_FORMAT, GST_VAAPI_ID_ARGS(image_id));

    if (image_id != VA_INVALID_ID) {
        GST_VAAPI_DISPLAY_LOCK(display);
        status = vaDestroyImage(GST_VAAPI_DISPLAY_VADISPLAY(display), image_id);
        GST_VAAPI_DISPLAY_UNLOCK(display);
        if (!vaapi_check_status(status, "vaDestroyImage()"))
            g_warning("failed to destroy image %" GST_VAAPI_ID_FORMAT,
                      GST_VAAPI_ID_ARGS(image_id));
        GST_VAAPI_OBJECT_ID(image) = VA_INVALID_ID;
    }
}

static gboolean
_gst_vaapi_image_create(GstVaapiImage *image, GstVideoFormat format)
{
    GstVaapiDisplay * const display = GST_VAAPI_OBJECT_DISPLAY(image);
    const VAImageFormat *va_format;
    VAStatus status;

    if (!gst_vaapi_display_has_image_format(display, format))
        return FALSE;

    va_format = gst_video_format_to_va_format(format);
    if (!va_format)
        return FALSE;

    GST_VAAPI_DISPLAY_LOCK(display);
    status = vaCreateImage(
        GST_VAAPI_DISPLAY_VADISPLAY(display),
        (VAImageFormat *)va_format,
        image->width,
        image->height,
        &image->internal_image
    );
    GST_VAAPI_DISPLAY_UNLOCK(display);
    if (status != VA_STATUS_SUCCESS ||
        image->internal_image.format.fourcc != va_format->fourcc)
        return FALSE;

    image->internal_format = format;
    return TRUE;
}

static gboolean
gst_vaapi_image_create(GstVaapiImage *image, GstVideoFormat format,
    guint width, guint height)
{
    const VAImageFormat *va_format;
    VAImageID image_id;

    image->format = format;
    image->width  = width;
    image->height = height;

    if (!_gst_vaapi_image_create(image, format)) {
        switch (format) {
        case GST_VIDEO_FORMAT_I420:
            format = GST_VIDEO_FORMAT_YV12;
            break;
        case GST_VIDEO_FORMAT_YV12:
            format = GST_VIDEO_FORMAT_I420;
            break;
        default:
            format = 0;
            break;
        }
        if (!format || !_gst_vaapi_image_create(image, format))
            return FALSE;
    }
    image->image = image->internal_image;
    image_id     = image->image.image_id;

    if (image->format != image->internal_format) {
        switch (image->format) {
        case GST_VIDEO_FORMAT_YV12:
        case GST_VIDEO_FORMAT_I420:
            va_format = gst_video_format_to_va_format(image->format);
            if (!va_format)
                return FALSE;
            image->image.format = *va_format;
            SWAP_UINT(image->image.offsets[1], image->image.offsets[2]);
            SWAP_UINT(image->image.pitches[1], image->image.pitches[2]);
            break;
        default:
            break;
        }
    }
    image->is_linear = vaapi_image_is_linear(&image->image);

    GST_DEBUG("image %" GST_VAAPI_ID_FORMAT, GST_VAAPI_ID_ARGS(image_id));
    GST_VAAPI_OBJECT_ID(image) = image_id;
    return TRUE;
}

static void
gst_vaapi_image_init(GstVaapiImage *image)
{
    image->internal_image.image_id = VA_INVALID_ID;
    image->internal_image.buf = VA_INVALID_ID;
    image->image.image_id = VA_INVALID_ID;
    image->image.buf = VA_INVALID_ID;
}

static void
gst_vaapi_image_class_init(GstVaapiImageClass *klass)
{
    GstVaapiObjectClass * const object_class =
        GST_VAAPI_OBJECT_CLASS(klass);

    object_class->init = (GstVaapiObjectInitFunc)gst_vaapi_image_init;
}

#define gst_vaapi_image_finalize gst_vaapi_image_destroy
GST_VAAPI_OBJECT_DEFINE_CLASS_WITH_CODE(
    GstVaapiImage,
    gst_vaapi_image,
    gst_vaapi_image_class_init(&g_class))

/**
 * gst_vaapi_image_new:
 * @display: a #GstVaapiDisplay
 * @format: a #GstVideoFormat
 * @width: the requested image width
 * @height: the requested image height
 *
 * Creates a new #GstVaapiImage with the specified format and
 * dimensions.
 *
 * Return value: the newly allocated #GstVaapiImage object
 */
GstVaapiImage *
gst_vaapi_image_new(
    GstVaapiDisplay    *display,
    GstVideoFormat      format,
    guint               width,
    guint               height
)
{
    GstVaapiImage *image;

    g_return_val_if_fail(width > 0, NULL);
    g_return_val_if_fail(height > 0, NULL);

    GST_DEBUG("format %" GST_FOURCC_FORMAT ", size %ux%u",
              GST_FOURCC_ARGS(format), width, height);

    image = gst_vaapi_object_new(gst_vaapi_image_class(), display);
    if (!image)
        return NULL;

    if (!gst_vaapi_image_create(image, format, width, height))
        goto error;
    return image;

error:
    gst_vaapi_object_unref(image);
    return NULL;
}

/**
 * gst_vaapi_image_new_with_image:
 * @display: a #GstVaapiDisplay
 * @va_image: a VA image
 *
 * Creates a new #GstVaapiImage from a foreign VA image. The image
 * format and dimensions will be extracted from @va_image. This
 * function is mainly used by gst_vaapi_surface_derive_image() to bind
 * a VA image to a #GstVaapiImage object.
 *
 * Return value: the newly allocated #GstVaapiImage object
 */
GstVaapiImage *
gst_vaapi_image_new_with_image(GstVaapiDisplay *display, VAImage *va_image)
{
    GstVaapiImage *image;

    g_return_val_if_fail(va_image, NULL);
    g_return_val_if_fail(va_image->image_id != VA_INVALID_ID, NULL);
    g_return_val_if_fail(va_image->buf != VA_INVALID_ID, NULL);

    GST_DEBUG("VA image 0x%08x, format %" GST_FOURCC_FORMAT ", size %ux%u",
              va_image->image_id,
              GST_FOURCC_ARGS(va_image->format.fourcc),
              va_image->width, va_image->height);

    image = gst_vaapi_object_new(gst_vaapi_image_class(), display);
    if (!image)
        return NULL;

    if (!_gst_vaapi_image_set_image(image, va_image))
        goto error;
    return image;

error:
    gst_vaapi_object_unref(image);
    return NULL;
}

/**
 * gst_vaapi_image_get_id:
 * @image: a #GstVaapiImage
 *
 * Returns the underlying VAImageID of the @image.
 *
 * Return value: the underlying VA image id
 */
GstVaapiID
gst_vaapi_image_get_id(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, VA_INVALID_ID);

    return GST_VAAPI_OBJECT_ID(image);
}

/**
 * gst_vaapi_image_get_image:
 * @image: a #GstVaapiImage
 * @va_image: a VA image
 *
 * Fills @va_image with the VA image used internally.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_get_image(GstVaapiImage *image, VAImage *va_image)
{
    g_return_val_if_fail(image != NULL, FALSE);

    if (va_image)
        *va_image = image->image;

    return TRUE;
}

/*
 * _gst_vaapi_image_set_image:
 * @image: a #GstVaapiImage
 * @va_image: a VA image
 *
 * Initializes #GstVaapiImage with a foreign VA image. This function
 * will try to "linearize" the VA image. i.e. making sure that the VA
 * image offsets into the data buffer are in increasing order with the
 * number of planes available in the image.
 *
 * This is an internal function used by gst_vaapi_image_new_with_image().
 *
 * Return value: %TRUE on success
 */
gboolean
_gst_vaapi_image_set_image(GstVaapiImage *image, const VAImage *va_image)
{
    GstVideoFormat format;
    VAImage alt_va_image;
    const VAImageFormat *alt_va_format;

    format = gst_video_format_from_va_format(&va_image->format);
    if (format == GST_VIDEO_FORMAT_UNKNOWN)
        return FALSE;

    image->internal_image  = *va_image;
    image->internal_format = format;
    image->is_linear       = vaapi_image_is_linear(va_image);
    image->image           = *va_image;
    image->format          = format;
    image->width           = va_image->width;
    image->height          = va_image->height;

    GST_VAAPI_OBJECT_ID(image) = va_image->image_id;

    /* Try to linearize image */
    if (!image->is_linear) {
        switch (format) {
        case GST_VIDEO_FORMAT_I420:
            format = GST_VIDEO_FORMAT_YV12;
            break;
        case GST_VIDEO_FORMAT_YV12:
            format = GST_VIDEO_FORMAT_I420;
            break;
        default:
            format = 0;
            break;
        }
        if (format &&
            (alt_va_format = gst_video_format_to_va_format(format))) {
            alt_va_image = *va_image;
            alt_va_image.format = *alt_va_format;
            SWAP_UINT(alt_va_image.offsets[1], alt_va_image.offsets[2]);
            SWAP_UINT(alt_va_image.pitches[1], alt_va_image.pitches[2]);
            if (vaapi_image_is_linear(&alt_va_image)) {
                image->image     = alt_va_image;
                image->format    = format;
                image->is_linear = TRUE;
                GST_DEBUG("linearized image to %" GST_FOURCC_FORMAT " format",
                          GST_FOURCC_ARGS(format));
            }
        }
    }
    return TRUE;
}

/**
 * gst_vaapi_image_get_format:
 * @image: a #GstVaapiImage
 *
 * Returns the #GstVideoFormat the @image was created with.
 *
 * Return value: the #GstVideoFormat
 */
GstVideoFormat
gst_vaapi_image_get_format(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, 0);

    return image->format;
}

/**
 * gst_vaapi_image_get_width:
 * @image: a #GstVaapiImage
 *
 * Returns the @image width.
 *
 * Return value: the image width, in pixels
 */
guint
gst_vaapi_image_get_width(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, 0);

    return image->width;
}

/**
 * gst_vaapi_image_get_height:
 * @image: a #GstVaapiImage
 *
 * Returns the @image height.
 *
 * Return value: the image height, in pixels.
 */
guint
gst_vaapi_image_get_height(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, 0);

    return image->height;
}

/**
 * gst_vaapi_image_get_size:
 * @image: a #GstVaapiImage
 * @pwidth: return location for the width, or %NULL
 * @pheight: return location for the height, or %NULL
 *
 * Retrieves the dimensions of a #GstVaapiImage.
 */
void
gst_vaapi_image_get_size(GstVaapiImage *image, guint *pwidth, guint *pheight)
{
    g_return_if_fail(image != NULL);

    if (pwidth)
        *pwidth = image->width;

    if (pheight)
        *pheight = image->height;
}

/**
 * gst_vaapi_image_is_linear:
 * @image: a #GstVaapiImage
 *
 * Checks whether the @image has data planes allocated from a single
 * buffer and offsets into that buffer are in increasing order with
 * the number of planes.
 *
 * Return value: %TRUE if image data planes are allocated from a single buffer
 */
gboolean
gst_vaapi_image_is_linear(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, FALSE);

    return image->is_linear;
}

/**
 * gst_vaapi_image_is_mapped:
 * @image: a #GstVaapiImage
 *
 * Checks whether the @image is currently mapped or not.
 *
 * Return value: %TRUE if the @image is mapped
 */
static inline gboolean
_gst_vaapi_image_is_mapped(GstVaapiImage *image)
{
    return image->image_data != NULL;
}

gboolean
gst_vaapi_image_is_mapped(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, FALSE);

    return _gst_vaapi_image_is_mapped(image);
}

/**
 * gst_vaapi_image_map:
 * @image: a #GstVaapiImage
 *
 * Maps the image data buffer. The actual pixels are returned by the
 * gst_vaapi_image_get_plane() function.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_map(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, FALSE);

    return _gst_vaapi_image_map(image, NULL);
}

gboolean
_gst_vaapi_image_map(GstVaapiImage *image, GstVaapiImageRaw *raw_image)
{
    GstVaapiDisplay *display;
    VAStatus status;
    guint i;

    if (_gst_vaapi_image_is_mapped(image))
        goto map_success;

    display = GST_VAAPI_OBJECT_DISPLAY(image);
    if (!display)
        return FALSE;

    GST_VAAPI_DISPLAY_LOCK(display);
    status = vaMapBuffer(
        GST_VAAPI_DISPLAY_VADISPLAY(display),
        image->image.buf,
        (void **)&image->image_data
    );
    GST_VAAPI_DISPLAY_UNLOCK(display);
    if (!vaapi_check_status(status, "vaMapBuffer()"))
        return FALSE;

map_success:
    if (raw_image) {
        const VAImage * const va_image = &image->image;
        raw_image->format     = image->format;
        raw_image->width      = va_image->width;
        raw_image->height     = va_image->height;
        raw_image->num_planes = va_image->num_planes;
        for (i = 0; i < raw_image->num_planes; i++) {
            raw_image->pixels[i] = (guchar *)image->image_data +
                va_image->offsets[i];
            raw_image->stride[i] = va_image->pitches[i];
        }
    }
    return TRUE;
}

/**
 * gst_vaapi_image_unmap:
 * @image: a #GstVaapiImage
 *
 * Unmaps the image data buffer. Pointers to pixels returned by
 * gst_vaapi_image_get_plane() are then no longer valid.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_unmap(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, FALSE);

    return _gst_vaapi_image_unmap(image);
}

gboolean
_gst_vaapi_image_unmap(GstVaapiImage *image)
{
    GstVaapiDisplay *display;
    VAStatus status;

    if (!_gst_vaapi_image_is_mapped(image))
        return TRUE;

    display = GST_VAAPI_OBJECT_DISPLAY(image);
    if (!display)
        return FALSE;

    GST_VAAPI_DISPLAY_LOCK(display);
    status = vaUnmapBuffer(
        GST_VAAPI_DISPLAY_VADISPLAY(display),
        image->image.buf
    );
    GST_VAAPI_DISPLAY_UNLOCK(display);
    if (!vaapi_check_status(status, "vaUnmapBuffer()"))
        return FALSE;

    image->image_data = NULL;
    return TRUE;
}

/**
 * gst_vaapi_image_get_plane_count:
 * @image: a #GstVaapiImage
 *
 * Retrieves the number of planes available in the @image. The @image
 * must be mapped for this function to work properly.
 *
 * Return value: the number of planes available in the @image
 */
guint
gst_vaapi_image_get_plane_count(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, 0);
    g_return_val_if_fail(_gst_vaapi_image_is_mapped(image), 0);

    return image->image.num_planes;
}

/**
 * gst_vaapi_image_get_plane:
 * @image: a #GstVaapiImage
 * @plane: the requested plane number
 *
 * Retrieves the pixels data to the specified @plane. The @image must
 * be mapped for this function to work properly.
 *
 * Return value: the pixels data of the specified @plane
 */
guchar *
gst_vaapi_image_get_plane(GstVaapiImage *image, guint plane)
{
    g_return_val_if_fail(image != NULL, NULL);
    g_return_val_if_fail(_gst_vaapi_image_is_mapped(image), NULL);
    g_return_val_if_fail(plane < image->image.num_planes, NULL);

    return image->image_data + image->image.offsets[plane];
}

/**
 * gst_vaapi_image_get_pitch:
 * @image: a #GstVaapiImage
 * @plane: the requested plane number
 *
 * Retrieves the line size (stride) of the specified @plane. The
 * @image must be mapped for this function to work properly.
 *
 * Return value: the line size (stride) of the specified plane
 */
guint
gst_vaapi_image_get_pitch(GstVaapiImage *image, guint plane)
{
    g_return_val_if_fail(image != NULL, 0);
    g_return_val_if_fail(_gst_vaapi_image_is_mapped(image), 0);
    g_return_val_if_fail(plane < image->image.num_planes, 0);

    return image->image.pitches[plane];
}

/**
 * gst_vaapi_image_get_data_size:
 * @image: a #GstVaapiImage
 *
 * Retrieves the underlying image data size. This function could be
 * used to determine whether the image has a compatible layout with
 * another image structure.
 *
 * Return value: the whole image data size of the @image
 */
guint
gst_vaapi_image_get_data_size(GstVaapiImage *image)
{
    g_return_val_if_fail(image != NULL, 0);

    return image->image.data_size;
}

#if GST_CHECK_VERSION(1,0,0)
#include <gst/video/gstvideometa.h>

static gboolean
init_image_from_video_meta(GstVaapiImageRaw *raw_image, GstVideoMeta *vmeta)
{
    GST_FIXME("map from GstVideoMeta + add fini_image_from_buffer()");
    return FALSE;
}

static gboolean
init_image_from_buffer(GstVaapiImageRaw *raw_image, GstBuffer *buffer)
{
    GstVideoMeta * const vmeta = gst_buffer_get_video_meta(buffer);

    return vmeta ? init_image_from_video_meta(raw_image, vmeta) : FALSE;
}
#else
static gboolean
init_image_from_buffer(GstVaapiImageRaw *raw_image, GstBuffer *buffer)
{
    GstCaps *caps;
    guchar *data;
    guint32 data_size;
    GstVideoInfo vi;
    guint i, frame_size;

    data      = GST_BUFFER_DATA(buffer);
    data_size = GST_BUFFER_SIZE(buffer);
    caps      = GST_BUFFER_CAPS(buffer);

    if (!caps)
        return FALSE;

    if (!gst_video_info_from_caps(&vi, caps))
        goto error_unsupported_caps;

    /* Check for compatible data size */
    frame_size = GST_VIDEO_INFO_SIZE(&vi);
    if (frame_size != data_size)
        goto error_incompatible_size;

    raw_image->format = GST_VIDEO_INFO_FORMAT(&vi);
    raw_image->width  = GST_VIDEO_INFO_WIDTH(&vi);
    raw_image->height = GST_VIDEO_INFO_HEIGHT(&vi);

    raw_image->num_planes = GST_VIDEO_INFO_N_PLANES(&vi);
    for (i = 0; i < raw_image->num_planes; i++) {
        raw_image->pixels[i] = data + GST_VIDEO_INFO_PLANE_OFFSET(&vi, i);
        raw_image->stride[i] = GST_VIDEO_INFO_PLANE_STRIDE(&vi, i);
    }
    return TRUE;

    /* ERRORS */
error_unsupported_caps:
    GST_ERROR("unsupported caps %" GST_PTR_FORMAT, caps);
    return FALSE;
error_incompatible_size:
    GST_ERROR("incompatible frame size (%u) with buffer size (%u)",
              frame_size, data_size);
    return FALSE;
}
#endif

/* Copy N lines of an image */
static inline void
memcpy_pic(
    guchar       *dst,
    guint         dst_stride,
    const guchar *src,
    guint         src_stride,
    guint         len,
    guint         height
)
{
    guint i;

    for (i = 0; i < height; i++)  {
        memcpy(dst, src, len);
        dst += dst_stride;
        src += src_stride;
    }
}

/* Copy NV12 images */
static void
copy_image_NV12(
    GstVaapiImageRaw        *dst_image,
    GstVaapiImageRaw        *src_image,
    const GstVaapiRectangle *rect
)
{
    guchar *dst, *src;
    guint dst_stride, src_stride;

    /* Y plane */
    dst_stride = dst_image->stride[0];
    dst = dst_image->pixels[0] + rect->y * dst_stride + rect->x;
    src_stride = src_image->stride[0];
    src = src_image->pixels[0] + rect->y * src_stride + rect->x;
    memcpy_pic(dst, dst_stride, src, src_stride, rect->width, rect->height);

    /* UV plane */
    dst_stride = dst_image->stride[1];
    dst = dst_image->pixels[1] + (rect->y / 2) * dst_stride + (rect->x & -2);
    src_stride = src_image->stride[1];
    src = src_image->pixels[1] + (rect->y / 2) * src_stride + (rect->x & -2);
    memcpy_pic(dst, dst_stride, src, src_stride, rect->width, rect->height / 2);
}

/* Copy YV12 images */
static void
copy_image_YV12(
    GstVaapiImageRaw        *dst_image,
    GstVaapiImageRaw        *src_image,
    const GstVaapiRectangle *rect
)
{
    guchar *dst, *src;
    guint dst_stride, src_stride;
    guint i, x, y, w, h;

    /* Y plane */
    dst_stride = dst_image->stride[0];
    dst = dst_image->pixels[0] + rect->y * dst_stride + rect->x;
    src_stride = src_image->stride[0];
    src = src_image->pixels[0] + rect->y * src_stride + rect->x;
    memcpy_pic(dst, dst_stride, src, src_stride, rect->width, rect->height);

    /* U/V planes */
    x = rect->x / 2;
    y = rect->y / 2;
    w = rect->width / 2;
    h = rect->height / 2;
    for (i = 1; i < dst_image->num_planes; i++) {
        dst_stride = dst_image->stride[i];
        dst = dst_image->pixels[i] + y * dst_stride + x;
        src_stride = src_image->stride[i];
        src = src_image->pixels[i] + y * src_stride + x;
        memcpy_pic(dst, dst_stride, src, src_stride, w, h);
    }
}

/* Copy RGBA images */
static void
copy_image_RGBA(
    GstVaapiImageRaw        *dst_image,
    GstVaapiImageRaw        *src_image,
    const GstVaapiRectangle *rect
)
{
    guchar *dst, *src;
    guint dst_stride, src_stride;

    dst_stride = dst_image->stride[0];
    dst = dst_image->pixels[0] + rect->y * dst_stride + rect->x;
    src_stride = src_image->stride[0];
    src = src_image->pixels[0] + rect->y * src_stride + rect->x;
    memcpy_pic(dst, dst_stride, src, src_stride, 4 * rect->width, rect->height);
}

static gboolean
copy_image(
    GstVaapiImageRaw        *dst_image,
    GstVaapiImageRaw        *src_image,
    const GstVaapiRectangle *rect
)
{
    GstVaapiRectangle default_rect;

    if (dst_image->format != src_image->format ||
        dst_image->width  != src_image->width  ||
        dst_image->height != src_image->height)
        return FALSE;

    if (rect) {
        if (rect->x >= src_image->width ||
            rect->x + rect->width > src_image->width ||
            rect->y >= src_image->height ||
            rect->y + rect->height > src_image->height)
            return FALSE;
    }
    else {
        default_rect.x      = 0;
        default_rect.y      = 0;
        default_rect.width  = src_image->width;
        default_rect.height = src_image->height;
        rect                = &default_rect;
    }

    switch (dst_image->format) {
    case GST_VIDEO_FORMAT_NV12:
        copy_image_NV12(dst_image, src_image, rect);
        break;
    case GST_VIDEO_FORMAT_YV12:
    case GST_VIDEO_FORMAT_I420:
        copy_image_YV12(dst_image, src_image, rect);
        break;
    case GST_VIDEO_FORMAT_ARGB:
    case GST_VIDEO_FORMAT_RGBA:
    case GST_VIDEO_FORMAT_ABGR:
    case GST_VIDEO_FORMAT_BGRA:
        copy_image_RGBA(dst_image, src_image, rect);
        break;
    default:
        GST_ERROR("unsupported image format for copy");
        return FALSE;
    }
    return TRUE;
}

/**
 * gst_vaapi_image_get_buffer:
 * @image: a #GstVaapiImage
 * @buffer: a #GstBuffer
 * @rect: a #GstVaapiRectangle expressing a region, or %NULL for the
 *   whole image
 *
 * Transfers pixels data contained in the @image into the #GstBuffer.
 * Both image structures shall have the same format.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_get_buffer(
    GstVaapiImage     *image,
    GstBuffer         *buffer,
    GstVaapiRectangle *rect
)
{
    GstVaapiImageRaw dst_image, src_image;
    gboolean success;

    g_return_val_if_fail(image != NULL, FALSE);
    g_return_val_if_fail(GST_IS_BUFFER(buffer), FALSE);

    if (!init_image_from_buffer(&dst_image, buffer))
        return FALSE;
    if (dst_image.format != image->format)
        return FALSE;
    if (dst_image.width != image->width || dst_image.height != image->height)
        return FALSE;

    if (!_gst_vaapi_image_map(image, &src_image))
        return FALSE;

    success = copy_image(&dst_image, &src_image, rect);

    if (!_gst_vaapi_image_unmap(image))
        return FALSE;

    return success;
}

/**
 * gst_vaapi_image_get_raw:
 * @image: a #GstVaapiImage
 * @dst_image: a #GstVaapiImageRaw
 * @rect: a #GstVaapiRectangle expressing a region, or %NULL for the
 *   whole image
 *
 * Transfers pixels data contained in the @image into the #GstVaapiImageRaw.
 * Both image structures shall have the same format.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_get_raw(
    GstVaapiImage     *image,
    GstVaapiImageRaw  *dst_image,
    GstVaapiRectangle *rect
)
{
    GstVaapiImageRaw src_image;
    gboolean success;

    g_return_val_if_fail(image != NULL, FALSE);

    if (!_gst_vaapi_image_map(image, &src_image))
        return FALSE;

    success = copy_image(dst_image, &src_image, rect);

    if (!_gst_vaapi_image_unmap(image))
        return FALSE;

    return success;
}

/**
 * gst_vaapi_image_update_from_buffer:
 * @image: a #GstVaapiImage
 * @buffer: a #GstBuffer
 * @rect: a #GstVaapiRectangle expressing a region, or %NULL for the
 *   whole image
 *
 * Transfers pixels data contained in the #GstBuffer into the
 * @image. Both image structures shall have the same format.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_update_from_buffer(
    GstVaapiImage     *image,
    GstBuffer         *buffer,
    GstVaapiRectangle *rect
)
{
    GstVaapiImageRaw dst_image, src_image;
    gboolean success;

    g_return_val_if_fail(image != NULL, FALSE);
    g_return_val_if_fail(GST_IS_BUFFER(buffer), FALSE);

    if (!init_image_from_buffer(&src_image, buffer))
        return FALSE;
    if (src_image.format != image->format)
        return FALSE;
    if (src_image.width != image->width || src_image.height != image->height)
        return FALSE;

    if (!_gst_vaapi_image_map(image, &dst_image))
        return FALSE;

    success = copy_image(&dst_image, &src_image, rect);

    if (!_gst_vaapi_image_unmap(image))
        return FALSE;

    return success;
}

/**
 * gst_vaapi_image_update_from_raw:
 * @image: a #GstVaapiImage
 * @src_image: a #GstVaapiImageRaw
 * @buffer: a #GstBuffer
 * @rect: a #GstVaapiRectangle expressing a region, or %NULL for the
 *   whole image
 *
 * Transfers pixels data contained in the #GstVaapiImageRaw into the
 * @image. Both image structures shall have the same format.
 *
 * Return value: %TRUE on success
 */
gboolean
gst_vaapi_image_update_from_raw(
    GstVaapiImage     *image,
    GstVaapiImageRaw  *src_image,
    GstVaapiRectangle *rect
)
{
    GstVaapiImageRaw dst_image;
    gboolean success;

    g_return_val_if_fail(image != NULL, FALSE);

    if (!_gst_vaapi_image_map(image, &dst_image))
        return FALSE;

    success = copy_image(&dst_image, src_image, rect);

    if (!_gst_vaapi_image_unmap(image))
        return FALSE;

    return success;
}