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/*

 * BRender PIX (.pix) image decoder

 * Copyright (c) 2012 Aleksi Nurmi

 *

 * 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

 */

/*

 * Tested against samples from I-War / Independence War and Defiance.

 * If the PIX file does not contain a palette, the

 * palette_has_changed property of the AVFrame is set to 0.

 */

#include "libavutil/imgutils.h"

#include "avcodec.h"

#include "bytestream.h"

#include "internal.h"

typedef struct BRPixHeader {

    int format;

    unsigned int width, height;

} BRPixHeader;

static int brpix_decode_header(BRPixHeader *out, GetByteContext *pgb)

{

    unsigned int header_len = bytestream2_get_be32(pgb);

    out->format = bytestream2_get_byte(pgb);

    bytestream2_skip(pgb, 2);

    out->width = bytestream2_get_be16(pgb);

    out->height = bytestream2_get_be16(pgb);

    // the header is at least 11 bytes long; we read the first 7

    if (header_len < 11) {

        return 0;

    }

    // skip the rest of the header

    bytestream2_skip(pgb, header_len-7);

    return 1;

}

static int brpix_decode_frame(AVCodecContext *avctx,

                              void *data, int *got_frame,

                              AVPacket *avpkt)

{

    AVFrame *frame = data;

    int ret;

    GetByteContext gb;

    unsigned int bytes_pp;

    unsigned int magic[4];

    unsigned int chunk_type;

    unsigned int data_len;

    BRPixHeader hdr;

    bytestream2_init(&gb, avpkt->data, avpkt->size);

    magic[0] = bytestream2_get_be32(&gb);

    magic[1] = bytestream2_get_be32(&gb);

    magic[2] = bytestream2_get_be32(&gb);

    magic[3] = bytestream2_get_be32(&gb);

    if (magic[0] != 0x12 ||

        magic[1] != 0x8 ||

        magic[2] != 0x2 ||

        magic[3] != 0x2) {

        av_log(avctx, AV_LOG_ERROR, "Not a BRender PIX file\n");

        return AVERROR_INVALIDDATA;

    }

    chunk_type = bytestream2_get_be32(&gb);

    if (chunk_type != 0x3 && chunk_type != 0x3d) {

        av_log(avctx, AV_LOG_ERROR, "Invalid chunk type %d\n", chunk_type);

        return AVERROR_INVALIDDATA;

    }

    ret = brpix_decode_header(&hdr, &gb);

    if (!ret) {

        av_log(avctx, AV_LOG_ERROR, "Invalid header length\n");

        return AVERROR_INVALIDDATA;

    }

    switch (hdr.format) {

    case 3:

        avctx->pix_fmt = AV_PIX_FMT_PAL8;

        bytes_pp = 1;

        break;

    case 4:

        avctx->pix_fmt = AV_PIX_FMT_RGB555BE;

        bytes_pp = 2;

        break;

    case 5:

        avctx->pix_fmt = AV_PIX_FMT_RGB565BE;

        bytes_pp = 2;

        break;

    case 6:

        avctx->pix_fmt = AV_PIX_FMT_RGB24;

        bytes_pp = 3;

        break;

    case 7:

        avctx->pix_fmt = AV_PIX_FMT_0RGB;

        bytes_pp = 4;

        break;

    case 18:

        avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

        bytes_pp = 2;

        break;

    default:

        av_log(avctx, AV_LOG_ERROR, "Format %d is not supported\n",

                                    hdr.format);

        return AVERROR_PATCHWELCOME;

    }

    if (av_image_check_size(hdr.width, hdr.height, 0, avctx) < 0)

        return AVERROR_INVALIDDATA;

    if (hdr.width != avctx->width || hdr.height != avctx->height)

        avcodec_set_dimensions(avctx, hdr.width, hdr.height);

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

        return ret;

    chunk_type = bytestream2_get_be32(&gb);

    if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&

        (chunk_type == 0x3 || chunk_type == 0x3d)) {

        BRPixHeader palhdr;

        uint32_t *pal_out = (uint32_t *)frame->data[1];

        int i;

        ret = brpix_decode_header(&palhdr, &gb);

        if (!ret) {

            av_log(avctx, AV_LOG_ERROR, "Invalid palette header length\n");

            return AVERROR_INVALIDDATA;

        }

        if (palhdr.format != 7) {

            av_log(avctx, AV_LOG_ERROR, "Palette is not in 0RGB format\n");

            return AVERROR_INVALIDDATA;

        }

        chunk_type = bytestream2_get_be32(&gb);

        data_len = bytestream2_get_be32(&gb);

        bytestream2_skip(&gb, 8);

        if (chunk_type != 0x21 || data_len != 1032 ||

            bytestream2_get_bytes_left(&gb) < 1032) {

            av_log(avctx, AV_LOG_ERROR, "Invalid palette data\n");

            return AVERROR_INVALIDDATA;

        }

        // convert 0RGB to machine endian format (ARGB32)

        for (i = 0; i < 256; ++i) {

            bytestream2_skipu(&gb, 1);

            *pal_out++ = (0xFFU << 24) | bytestream2_get_be24u(&gb);

        }

        bytestream2_skip(&gb, 8);

        frame->palette_has_changed = 1;

        chunk_type = bytestream2_get_be32(&gb);

    } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

        uint32_t *pal_out = (uint32_t *)frame->data[1];

        int i;

        for (i = 0; i < 256; ++i) {

            *pal_out++ = (0xFFU << 24) | (i * 0x010101);

        }

        frame->palette_has_changed = 1;

    }

    data_len = bytestream2_get_be32(&gb);

    bytestream2_skip(&gb, 8);

    // read the image data to the buffer

    {

        unsigned int bytes_per_scanline = bytes_pp * hdr.width;

        unsigned int bytes_left = bytestream2_get_bytes_left(&gb);

        if (chunk_type != 0x21 || data_len != bytes_left ||

            bytes_left / bytes_per_scanline < hdr.height)

        {

            av_log(avctx, AV_LOG_ERROR, "Invalid image data\n");

            return AVERROR_INVALIDDATA;

        }

        av_image_copy_plane(frame->data[0], frame->linesize[0],

                            avpkt->data + bytestream2_tell(&gb),

                            bytes_per_scanline,

                            bytes_per_scanline, hdr.height);

    }

    *got_frame = 1;

    return avpkt->size;

}

AVCodec ff_brender_pix_decoder = {

    .name           = "brender_pix",

    .long_name      = NULL_IF_CONFIG_SMALL("BRender PIX image"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_BRENDER_PIX,

    .decode         = brpix_decode_frame,

    .capabilities   = CODEC_CAP_DR1,

};