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/*

 * CDXL video decoder

 * Copyright (c) 2011-2012 Paul B Mahol

 *

 * 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

 */

/**

 * @file

 * Commodore CDXL video decoder

 * @author Paul B Mahol

 */

#define UNCHECKED_BITSTREAM_READER 1

#include "libavutil/intreadwrite.h"

#include "libavutil/imgutils.h"

#include "avcodec.h"

#include "get_bits.h"

#include "internal.h"

#define BIT_PLANAR   0x00

#define CHUNKY       0x20

#define BYTE_PLANAR  0x40

#define BIT_LINE     0x80

#define BYTE_LINE    0xC0

typedef struct CDXLVideoContext {

    AVCodecContext *avctx;

    int            bpp;

    int            format;

    int            padded_bits;

    const uint8_t  *palette;

    int            palette_size;

    const uint8_t  *video;

    int            video_size;

    uint8_t        *new_video;

    int            new_video_size;

} CDXLVideoContext;

static av_cold int cdxl_decode_init(AVCodecContext *avctx)

{

    CDXLVideoContext *c = avctx->priv_data;

    c->new_video_size = 0;

    c->avctx          = avctx;

    return 0;

}

static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)

{

    int i;

    for (i = 0; i < c->palette_size / 2; i++) {

        unsigned rgb = AV_RB16(&c->palette[i * 2]);

        unsigned r   = ((rgb >> 8) & 0xF) * 0x11;

        unsigned g   = ((rgb >> 4) & 0xF) * 0x11;

        unsigned b   =  (rgb       & 0xF) * 0x11;

        AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);

    }

}

static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)

{

    GetBitContext gb;

    int x, y, plane;

    if (init_get_bits8(&gb, c->video, c->video_size) < 0)

        return;

    for (plane = 0; plane < c->bpp; plane++) {

        for (y = 0; y < c->avctx->height; y++) {

            for (x = 0; x < c->avctx->width; x++)

                out[linesize * y + x] |= get_bits1(&gb) << plane;

            skip_bits(&gb, c->padded_bits);

        }

    }

}

static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)

{

    GetBitContext  gb;

    int x, y, plane;

    if (init_get_bits8(&gb, c->video, c->video_size) < 0)

        return;

    for (y = 0; y < c->avctx->height; y++) {

        for (plane = 0; plane < c->bpp; plane++) {

            for (x = 0; x < c->avctx->width; x++)

                out[linesize * y + x] |= get_bits1(&gb) << plane;

            skip_bits(&gb, c->padded_bits);

        }

    }

}

static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)

{

    memset(out, 0, linesize * c->avctx->height);

    switch (c->format) {

    case BIT_PLANAR:

        bitplanar2chunky(c, linesize, out);

        break;

    case BIT_LINE:

        bitline2chunky(c, linesize, out);

        break;

    }

}

static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)

{

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

    memset(frame->data[1], 0, AVPALETTE_SIZE);

    import_palette(c, new_palette);

    import_format(c, frame->linesize[0], frame->data[0]);

}

static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)

{

    AVCodecContext *avctx = c->avctx;

    uint32_t new_palette[16], r, g, b;

    uint8_t *ptr, *out, index, op;

    int x, y;

    ptr = c->new_video;

    out = frame->data[0];

    import_palette(c, new_palette);

    import_format(c, avctx->width, c->new_video);

    for (y = 0; y < avctx->height; y++) {

        r = new_palette[0] & 0xFF0000;

        g = new_palette[0] & 0xFF00;

        b = new_palette[0] & 0xFF;

        for (x = 0; x < avctx->width; x++) {

            index  = *ptr++;

            op     = index >> 4;

            index &= 15;

            switch (op) {

            case 0:

                r = new_palette[index] & 0xFF0000;

                g = new_palette[index] & 0xFF00;

                b = new_palette[index] & 0xFF;

                break;

            case 1:

                b = index * 0x11;

                break;

            case 2:

                r = index * 0x11 << 16;

                break;

            case 3:

                g = index * 0x11 << 8;

                break;

            }

            AV_WL24(out + x * 3, r | g | b);

        }

        out += frame->linesize[0];

    }

}

static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)

{

    AVCodecContext *avctx = c->avctx;

    uint32_t new_palette[64], r, g, b;

    uint8_t *ptr, *out, index, op;

    int x, y;

    ptr = c->new_video;

    out = frame->data[0];

    import_palette(c, new_palette);

    import_format(c, avctx->width, c->new_video);

    for (y = 0; y < avctx->height; y++) {

        r = new_palette[0] & 0xFF0000;

        g = new_palette[0] & 0xFF00;

        b = new_palette[0] & 0xFF;

        for (x = 0; x < avctx->width; x++) {

            index  = *ptr++;

            op     = index >> 6;

            index &= 63;

            switch (op) {

            case 0:

                r = new_palette[index] & 0xFF0000;

                g = new_palette[index] & 0xFF00;

                b = new_palette[index] & 0xFF;

                break;

            case 1:

                b = (index <<  2) | (b & 3);

                break;

            case 2:

                r = (index << 18) | (r & (3 << 16));

                break;

            case 3:

                g = (index << 10) | (g & (3 << 8));

                break;

            }

            AV_WL24(out + x * 3, r | g | b);

        }

        out += frame->linesize[0];

    }

}

static int cdxl_decode_frame(AVCodecContext *avctx, void *data,

                             int *got_frame, AVPacket *pkt)

{

    CDXLVideoContext *c = avctx->priv_data;

    AVFrame * const p = data;

    int ret, w, h, encoding, aligned_width, buf_size = pkt->size;

    const uint8_t *buf = pkt->data;

    if (buf_size < 32)

        return AVERROR_INVALIDDATA;

    encoding        = buf[1] & 7;

    c->format       = buf[1] & 0xE0;

    w               = AV_RB16(&buf[14]);

    h               = AV_RB16(&buf[16]);

    c->bpp          = buf[19];

    c->palette_size = AV_RB16(&buf[20]);

    c->palette      = buf + 32;

    c->video        = c->palette + c->palette_size;

    c->video_size   = buf_size - c->palette_size - 32;

    if (c->palette_size > 512)

        return AVERROR_INVALIDDATA;

    if (buf_size < c->palette_size + 32)

        return AVERROR_INVALIDDATA;

    if (c->bpp < 1)

        return AVERROR_INVALIDDATA;

    if (c->format != BIT_PLANAR && c->format != BIT_LINE) {

        avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);

        return AVERROR_PATCHWELCOME;

    }

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

        return ret;

    aligned_width = FFALIGN(c->avctx->width, 16);

    c->padded_bits  = aligned_width - c->avctx->width;

    if (c->video_size < aligned_width * avctx->height * c->bpp / 8)

        return AVERROR_INVALIDDATA;

    if (!encoding && c->palette_size && c->bpp <= 8) {

        avctx->pix_fmt = AV_PIX_FMT_PAL8;

    } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {

        if (c->palette_size != (1 << (c->bpp - 1)))

            return AVERROR_INVALIDDATA;

        avctx->pix_fmt = AV_PIX_FMT_BGR24;

    } else {

        avpriv_request_sample(avctx, "Encoding %d and bpp %d",

                              encoding, c->bpp);

        return AVERROR_PATCHWELCOME;

    }

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

        return ret;

    p->pict_type = AV_PICTURE_TYPE_I;

    if (encoding) {

        av_fast_padded_malloc(&c->new_video, &c->new_video_size,

                              h * w + AV_INPUT_BUFFER_PADDING_SIZE);

        if (!c->new_video)

            return AVERROR(ENOMEM);

        if (c->bpp == 8)

            cdxl_decode_ham8(c, p);

        else

            cdxl_decode_ham6(c, p);

    } else {

        cdxl_decode_rgb(c, p);

    }

    *got_frame = 1;

    return buf_size;

}

static av_cold int cdxl_decode_end(AVCodecContext *avctx)

{

    CDXLVideoContext *c = avctx->priv_data;

    av_freep(&c->new_video);

    return 0;

}

AVCodec ff_cdxl_decoder = {

    .name           = "cdxl",

    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_CDXL,

    .priv_data_size = sizeof(CDXLVideoContext),

    .init           = cdxl_decode_init,

    .close          = cdxl_decode_end,

    .decode         = cdxl_decode_frame,

    .capabilities   = AV_CODEC_CAP_DR1,

};