/*
 * Video Acceleration API (video decoding)
 * HW decode acceleration for MPEG-2, MPEG-4, H.264 and VC-1
 *
 * Copyright (C) 2008-2009 Splitted-Desktop Systems
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "vaapi_internal.h"

/**
 * @addtogroup VAAPI_Decoding
 *
 * @{
 */

static void destroy_buffers(VADisplay display, VABufferID *buffers, unsigned int n_buffers)
{
    unsigned int i;
    for (i = 0; i < n_buffers; i++) {
        if (buffers[i]) {
            vaDestroyBuffer(display, buffers[i]);
            buffers[i] = 0;
        }
    }
}

static int render_picture(struct vaapi_context *vactx, VASurfaceID surface)
{
    VABufferID va_buffers[3];
    unsigned int n_va_buffers = 0;

    vaUnmapBuffer(vactx->display, vactx->pic_param_buf_id);
    va_buffers[n_va_buffers++] = vactx->pic_param_buf_id;

    if (vactx->iq_matrix_buf_id) {
        vaUnmapBuffer(vactx->display, vactx->iq_matrix_buf_id);
        va_buffers[n_va_buffers++] = vactx->iq_matrix_buf_id;
    }

    if (vactx->bitplane_buf_id) {
        vaUnmapBuffer(vactx->display, vactx->bitplane_buf_id);
        va_buffers[n_va_buffers++] = vactx->bitplane_buf_id;
    }

    if (vaBeginPicture(vactx->display, vactx->context_id,
                       surface) != VA_STATUS_SUCCESS)
        return -1;

    if (vaRenderPicture(vactx->display, vactx->context_id,
                        va_buffers, n_va_buffers) != VA_STATUS_SUCCESS)
        return -1;

    if (vaRenderPicture(vactx->display, vactx->context_id,
                        vactx->slice_buf_ids,
                        vactx->n_slice_buf_ids) != VA_STATUS_SUCCESS)
        return -1;

    if (vaEndPicture(vactx->display, vactx->context_id) != VA_STATUS_SUCCESS)
        return -1;

    return 0;
}

static int commit_slices(struct vaapi_context *vactx)
{
    VABufferID *slice_buf_ids;
    VABufferID slice_param_buf_id, slice_data_buf_id;

    if (vactx->slice_count == 0)
        return 0;

    slice_buf_ids =
        av_fast_realloc(vactx->slice_buf_ids,
                        &vactx->slice_buf_ids_alloc,
                        (vactx->n_slice_buf_ids + 2) * sizeof(slice_buf_ids[0]));
    if (!slice_buf_ids)
        return -1;
    vactx->slice_buf_ids = slice_buf_ids;

    slice_param_buf_id = 0;
    if (vaCreateBuffer(vactx->display, vactx->context_id,
                       VASliceParameterBufferType,
                       vactx->slice_param_size,
                       vactx->slice_count, vactx->slice_params,
                       &slice_param_buf_id) != VA_STATUS_SUCCESS)
        return -1;
    vactx->slice_count = 0;

    slice_data_buf_id = 0;
    if (vaCreateBuffer(vactx->display, vactx->context_id,
                       VASliceDataBufferType,
                       vactx->slice_data_size,
                       1, (void *)vactx->slice_data,
                       &slice_data_buf_id) != VA_STATUS_SUCCESS)
        return -1;
    vactx->slice_data = NULL;
    vactx->slice_data_size = 0;

    slice_buf_ids[vactx->n_slice_buf_ids++] = slice_param_buf_id;
    slice_buf_ids[vactx->n_slice_buf_ids++] = slice_data_buf_id;
    return 0;
}

static void *alloc_buffer(struct vaapi_context *vactx, int type, unsigned int size, uint32_t *buf_id)
{
    void *data = NULL;

    *buf_id = 0;
    if (vaCreateBuffer(vactx->display, vactx->context_id,
                       type, size, 1, NULL, buf_id) == VA_STATUS_SUCCESS)
        vaMapBuffer(vactx->display, *buf_id, &data);

    return data;
}

void *ff_vaapi_alloc_pic_param(struct vaapi_context *vactx, unsigned int size)
{
    return alloc_buffer(vactx, VAPictureParameterBufferType, size, &vactx->pic_param_buf_id);
}

void *ff_vaapi_alloc_iq_matrix(struct vaapi_context *vactx, unsigned int size)
{
    return alloc_buffer(vactx, VAIQMatrixBufferType, size, &vactx->iq_matrix_buf_id);
}

uint8_t *ff_vaapi_alloc_bitplane(struct vaapi_context *vactx, uint32_t size)
{
    return alloc_buffer(vactx, VABitPlaneBufferType, size, &vactx->bitplane_buf_id);
}

VASliceParameterBufferBase *ff_vaapi_alloc_slice(struct vaapi_context *vactx, const uint8_t *buffer, uint32_t size)
{
    uint8_t *slice_params;
    VASliceParameterBufferBase *slice_param;

    if (!vactx->slice_data)
        vactx->slice_data = buffer;
    if (vactx->slice_data + vactx->slice_data_size != buffer) {
        if (commit_slices(vactx) < 0)
            return NULL;
        vactx->slice_data = buffer;
    }

    slice_params =
        av_fast_realloc(vactx->slice_params,
                        &vactx->slice_params_alloc,
                        (vactx->slice_count + 1) * vactx->slice_param_size);
    if (!slice_params)
        return NULL;
    vactx->slice_params = slice_params;

    slice_param = (VASliceParameterBufferBase *)(slice_params + vactx->slice_count * vactx->slice_param_size);
    slice_param->slice_data_size   = size;
    slice_param->slice_data_offset = vactx->slice_data_size;
    slice_param->slice_data_flag   = VA_SLICE_DATA_FLAG_ALL;

    vactx->slice_count++;
    vactx->slice_data_size += size;
    return slice_param;
}

int ff_vaapi_common_end_frame(MpegEncContext *s)
{
    struct vaapi_context * const vactx = s->avctx->hwaccel_context;
    int ret = -1;

    av_dlog(s->avctx, "ff_vaapi_common_end_frame()\n");

    if (commit_slices(vactx) < 0)
        goto done;
    if (vactx->n_slice_buf_ids > 0) {
        if (render_picture(vactx, ff_vaapi_get_surface_id(s->current_picture_ptr)) < 0)
            goto done;
        ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);
    }
    ret = 0;

done:
    destroy_buffers(vactx->display, &vactx->pic_param_buf_id, 1);
    destroy_buffers(vactx->display, &vactx->iq_matrix_buf_id, 1);
    destroy_buffers(vactx->display, &vactx->bitplane_buf_id, 1);
    destroy_buffers(vactx->display, vactx->slice_buf_ids, vactx->n_slice_buf_ids);
    av_freep(&vactx->slice_buf_ids);
    av_freep(&vactx->slice_params);
    vactx->n_slice_buf_ids     = 0;
    vactx->slice_buf_ids_alloc = 0;
    vactx->slice_count         = 0;
    vactx->slice_params_alloc  = 0;
    return ret;
}

/* @} */