/*

 * V.Flash PTX (.ptx) image decoder

 * Copyright (c) 2007 Ivo van Poorten

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "libavutil/common.h"

#include "libavutil/intreadwrite.h"

#include "avcodec.h"

#include "codec_internal.h"

#include "decode.h"

static int ptx_decode_frame(AVCodecContext *avctx, AVFrame *p,

                            int *got_frame, AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    const uint8_t *buf_end = avpkt->data + avpkt->size;

    unsigned int offset, w, h, y, stride, bytes_per_pixel;

    int ret;

    uint8_t *ptr;

    if (buf_end - buf < 14)

        return AVERROR_INVALIDDATA;

    offset          = AV_RL16(buf);

    w               = AV_RL16(buf+8);

    h               = AV_RL16(buf+10);

    bytes_per_pixel = AV_RL16(buf+12) >> 3;

    if (bytes_per_pixel != 2) {

        avpriv_request_sample(avctx, "Image format not RGB15");

        return AVERROR_PATCHWELCOME;

    }

    avctx->pix_fmt = AV_PIX_FMT_BGR555LE;

    if (buf_end - buf < offset)

        return AVERROR_INVALIDDATA;

    if (offset != 0x2c)

        avpriv_request_sample(avctx, "offset != 0x2c");

    buf += offset;

    if (buf_end - buf < w * bytes_per_pixel)

        return AVERROR_INVALIDDATA;

    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)

        return ret;

    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

        return ret;

    p->pict_type = AV_PICTURE_TYPE_I;

    ptr    = p->data[0];

    stride = p->linesize[0];

    for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {

        memcpy(ptr, buf, w*bytes_per_pixel);

        ptr += stride;

        buf += w*bytes_per_pixel;

    }

    *got_frame = 1;

    if (y < h) {

        av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");

        return avpkt->size;

    }

    return offset + w*h*bytes_per_pixel;

}

const FFCodec ff_ptx_decoder = {

    .p.name         = "ptx",

    CODEC_LONG_NAME("V.Flash PTX image"),

    .p.type         = AVMEDIA_TYPE_VIDEO,

    .p.id           = AV_CODEC_ID_PTX,

    .p.capabilities = AV_CODEC_CAP_DR1,

    FF_CODEC_DECODE_CB(ptx_decode_frame),

};