src/video/directfb/SDL_DirectFB_yuv.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2006 Sam Lantinga

    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 St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/* This is the DirectFB implementation of YUV video overlays */

#include "SDL_video.h"
#include "SDL_DirectFB_yuv.h"
#include "../SDL_yuvfuncs.h"


/* The functions used to manipulate software video overlays */
static struct private_yuvhwfuncs directfb_yuvfuncs = {
    DirectFB_LockYUVOverlay,
    DirectFB_UnlockYUVOverlay,
    DirectFB_DisplayYUVOverlay,
    DirectFB_FreeYUVOverlay
};

struct private_yuvhwdata
{
    DFBDisplayLayerID layer_id;

    IDirectFBDisplayLayer *layer;
    IDirectFBSurface *surface;

    /* These are just so we don't have to allocate them separately */
    Uint16 pitches[3];
    Uint8 *planes[3];
};

static DFBEnumerationResult
enum_layers_callback(DFBDisplayLayerID id,
                     DFBDisplayLayerDescription desc, void *data)
{
    struct private_yuvhwdata *hwdata = (struct private_yuvhwdata *) data;

    /* we don't want the primary */
    if (id == DLID_PRIMARY)
        return DFENUM_OK;

    /* take the one with a surface for video */
    if ((desc.caps & DLCAPS_SURFACE) && (desc.type & DLTF_VIDEO)) {
        hwdata->layer_id = id;

        return DFENUM_CANCEL;
    }

    return DFENUM_OK;
}


static DFBResult
CreateYUVSurface(_THIS, struct private_yuvhwdata *hwdata,
                 int width, int height, Uint32 format)
{
    DFBResult ret;
    IDirectFB *dfb = HIDDEN->dfb;
    IDirectFBDisplayLayer *layer;
    DFBDisplayLayerConfig conf;

    ret = dfb->EnumDisplayLayers(dfb, enum_layers_callback, hwdata);
    if (ret) {
        SetDirectFBerror("IDirectFB::EnumDisplayLayers", ret);
        return ret;
    }

    if (!hwdata->layer_id)
        return DFB_UNSUPPORTED;

    ret = dfb->GetDisplayLayer(dfb, hwdata->layer_id, &layer);
    if (ret) {
        SetDirectFBerror("IDirectFB::GetDisplayLayer", ret);
        return ret;
    }

    conf.flags = DLCONF_WIDTH | DLCONF_HEIGHT | DLCONF_PIXELFORMAT;
    conf.width = width;
    conf.height = height;

    switch (format) {
    case SDL_YV12_OVERLAY:
        conf.pixelformat = DSPF_YV12;
        break;
    case SDL_IYUV_OVERLAY:
        conf.pixelformat = DSPF_I420;
        break;
    case SDL_YUY2_OVERLAY:
        conf.pixelformat = DSPF_YUY2;
        break;
    case SDL_UYVY_OVERLAY:
        conf.pixelformat = DSPF_UYVY;
        break;
    default:
        fprintf(stderr, "SDL_DirectFB: Unsupported YUV format (0x%08x)!\n",
                format);
        break;
    }

    ret = layer->SetConfiguration(layer, &conf);
    if (ret) {
        SetDirectFBerror("IDirectFBDisplayLayer::SetConfiguration", ret);
        layer->Release(layer);
        return ret;
    }

    ret = layer->GetSurface(layer, &hwdata->surface);
    if (ret) {
        SetDirectFBerror("IDirectFBDisplayLayer::GetSurface", ret);
        layer->Release(layer);
        return ret;
    }

    hwdata->layer = layer;

    return DFB_OK;
}

SDL_Overlay *
DirectFB_CreateYUVOverlay(_THIS, int width, int height, Uint32 format,
                          SDL_Surface * display)
{
    SDL_Overlay *overlay;
    struct private_yuvhwdata *hwdata;

    /* Create the overlay structure */
    overlay = SDL_calloc(1, sizeof(SDL_Overlay));
    if (!overlay) {
        SDL_OutOfMemory();
        return NULL;
    }

    /* Fill in the basic members */
    overlay->format = format;
    overlay->w = width;
    overlay->h = height;

    /* Set up the YUV surface function structure */
    overlay->hwfuncs = &directfb_yuvfuncs;

    /* Create the pixel data and lookup tables */
    hwdata = SDL_calloc(1, sizeof(struct private_yuvhwdata));
    overlay->hwdata = hwdata;
    if (!hwdata) {
        SDL_OutOfMemory();
        SDL_FreeYUVOverlay(overlay);
        return NULL;
    }

    if (CreateYUVSurface(this, hwdata, width, height, format)) {
        SDL_FreeYUVOverlay(overlay);
        return NULL;
    }

    overlay->hw_overlay = 1;

    /* Set up the plane pointers */
    overlay->pitches = hwdata->pitches;
    overlay->pixels = hwdata->planes;
    switch (format) {
    case SDL_YV12_OVERLAY:
    case SDL_IYUV_OVERLAY:
        overlay->planes = 3;
        break;
    default:
        overlay->planes = 1;
        break;
    }

    /* We're all done.. */
    return overlay;
}

int
DirectFB_LockYUVOverlay(_THIS, SDL_Overlay * overlay)
{
    DFBResult ret;
    void *data;
    int pitch;
    IDirectFBSurface *surface = overlay->hwdata->surface;

    ret = surface->Lock(surface, DSLF_READ | DSLF_WRITE, &data, &pitch);
    if (ret) {
        SetDirectFBerror("IDirectFBSurface::Lock", ret);
        return -1;
    }

    /* Find the pitch and offset values for the overlay */
    overlay->pitches[0] = (Uint16) pitch;
    overlay->pixels[0] = (Uint8 *) data;

    switch (overlay->format) {
    case SDL_YV12_OVERLAY:
    case SDL_IYUV_OVERLAY:
        /* Add the two extra planes */
        overlay->pitches[1] = overlay->pitches[0] / 2;
        overlay->pitches[2] = overlay->pitches[0] / 2;
        overlay->pixels[1] =
            overlay->pixels[0] + overlay->pitches[0] * overlay->h;
        overlay->pixels[2] =
            overlay->pixels[1] + overlay->pitches[1] * overlay->h / 2;
        break;
    default:
        /* Only one plane, no worries */
        break;
    }

    return 0;
}

void
DirectFB_UnlockYUVOverlay(_THIS, SDL_Overlay * overlay)
{
    IDirectFBSurface *surface = overlay->hwdata->surface;

    overlay->pixels[0] = overlay->pixels[1] = overlay->pixels[2] = NULL;

    surface->Unlock(surface);
}

int
DirectFB_DisplayYUVOverlay(_THIS, SDL_Overlay * overlay, SDL_Rect * src,
                           SDL_Rect * dst)
{
    DFBResult ret;
    DFBDisplayLayerConfig conf;
    IDirectFBDisplayLayer *primary = HIDDEN->layer;
    IDirectFBDisplayLayer *layer = overlay->hwdata->layer;

    primary->GetConfiguration(primary, &conf);

    ret = layer->SetScreenLocation(layer,
                                   dst->x / (float) conf.width,
                                   dst->y / (float) conf.height,
                                   dst->w / (float) conf.width,
                                   dst->h / (float) conf.height);
    if (ret) {
        SetDirectFBerror("IDirectFBDisplayLayer::SetScreenLocation", ret);
        return -1;
    }

    return 0;
}

void
DirectFB_FreeYUVOverlay(_THIS, SDL_Overlay * overlay)
{
    struct private_yuvhwdata *hwdata;

    hwdata = overlay->hwdata;
    if (hwdata) {
        if (hwdata->surface)
            hwdata->surface->Release(hwdata->surface);

        if (hwdata->layer)
            hwdata->layer->Release(hwdata->layer);

        free(hwdata);
    }
}

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