/*
 * Fraps FPS1 decoder
 * Copyright (c) 2005 Roine Gustafsson
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * 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
 */

/**
 * @file
 * Lossless Fraps 'FPS1' decoder
 * @author Roine Gustafsson (roine at users sf net)
 * @author Konstantin Shishkov
 *
 * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
 *
 * Version 2 files support by Konstantin Shishkov
 */

#include "avcodec.h"
#include "get_bits.h"
#include "huffman.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "internal.h"

#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
#define VLC_BITS 11

/**
 * local variable storage
 */
typedef struct FrapsContext {
    AVCodecContext *avctx;
    BswapDSPContext bdsp;
    AVFrame *frame;
    uint8_t *tmpbuf;
    int tmpbuf_size;
} FrapsContext;


/**
 * initializes decoder
 * @param avctx codec context
 * @return 0 on success or negative if fails
 */
static av_cold int decode_init(AVCodecContext *avctx)
{
    FrapsContext * const s = avctx->priv_data;

    avctx->pix_fmt     = AV_PIX_FMT_NONE; /* set in decode_frame */

    s->avctx  = avctx;
    s->tmpbuf = NULL;

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    ff_bswapdsp_init(&s->bdsp);

    return 0;
}

/**
 * Comparator - our nodes should ascend by count
 * but with preserved symbol order
 */
static int huff_cmp(const void *va, const void *vb)
{
    const Node *a = va, *b = vb;
    return (a->count - b->count)*256 + a->sym - b->sym;
}

/**
 * decode Fraps v2 packed plane
 */
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
                               int h, const uint8_t *src, int size, int Uoff,
                               const int step)
{
    int i, j, ret;
    GetBitContext gb;
    VLC vlc;
    Node nodes[512];

    for (i = 0; i < 256; i++)
        nodes[i].count = bytestream_get_le32(&src);
    size -= 1024;
    if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
                                  nodes, huff_cmp,
                                  FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
        return ret;
    /* we have built Huffman table and are ready to decode plane */

    /* convert bits so they may be used by standard bitreader */
    s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
                      (const uint32_t *) src, size >> 2);

    init_get_bits(&gb, s->tmpbuf, size * 8);
    for (j = 0; j < h; j++) {
        for (i = 0; i < w*step; i += step) {
            dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
            /* lines are stored as deltas between previous lines
             * and we need to add 0x80 to the first lines of chroma planes
             */
            if (j)
                dst[i] += dst[i - stride];
            else if (Uoff)
                dst[i] += 0x80;
            if (get_bits_left(&gb) < 0) {
                ff_free_vlc(&vlc);
                return AVERROR_INVALIDDATA;
            }
        }
        dst += stride;
    }
    ff_free_vlc(&vlc);
    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame,
                        AVPacket *avpkt)
{
    FrapsContext * const s = avctx->priv_data;
    const uint8_t *buf     = avpkt->data;
    int buf_size           = avpkt->size;
    AVFrame *frame         = data;
    AVFrame * const f      = s->frame;
    uint32_t header;
    unsigned int version,header_size;
    unsigned int x, y;
    const uint32_t *buf32;
    uint32_t *luma1,*luma2,*cb,*cr;
    uint32_t offs[4];
    int i, j, ret, is_chroma, planes;
    enum AVPixelFormat pix_fmt;
    int prev_pic_bit, expected_size;

    if (buf_size < 4) {
        av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
        return AVERROR_INVALIDDATA;
    }

    header      = AV_RL32(buf);
    version     = header & 0xff;
    header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
    prev_pic_bit = header & (1U << 31); /* bit 31 means same as previous pic */

    if (version > 5) {
        av_log(avctx, AV_LOG_ERROR,
               "This file is encoded with Fraps version %u. "
               "This codec can only decode versions <= 5.\n", version);
        return AVERROR_PATCHWELCOME;
    }

    buf += 4;
    if (header_size == 8)
        buf += 4;

    pix_fmt = version & 1 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
    if (avctx->pix_fmt != pix_fmt && f->data[0]) {
        av_frame_unref(f);
    }
    avctx->pix_fmt = pix_fmt;
    avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
                                     : AVCOL_RANGE_JPEG;

    expected_size = header_size;

    switch (version) {
    case 0:
    default:
        /* Fraps v0 is a reordered YUV420 */
        if (!prev_pic_bit)
            expected_size += avctx->width * avctx->height * 3 / 2;
        if (buf_size != expected_size) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid frame length %d (should be %d)\n",
                   buf_size, expected_size);
            return AVERROR_INVALIDDATA;
        }

        if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
            av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
                   avctx->width, avctx->height);
            return AVERROR_INVALIDDATA;
        }

        if ((ret = ff_reget_buffer(avctx, f)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
            return ret;
        }
        f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
        f->key_frame = f->pict_type == AV_PICTURE_TYPE_I;

        if (f->pict_type == AV_PICTURE_TYPE_I) {
            buf32 = (const uint32_t*)buf;
            for (y = 0; y < avctx->height / 2; y++) {
                luma1 = (uint32_t*)&f->data[0][ y * 2      * f->linesize[0]];
                luma2 = (uint32_t*)&f->data[0][(y * 2 + 1) * f->linesize[0]];
                cr    = (uint32_t*)&f->data[1][ y          * f->linesize[1]];
                cb    = (uint32_t*)&f->data[2][ y          * f->linesize[2]];
                for (x = 0; x < avctx->width; x += 8) {
                    *(luma1++) = *(buf32++);
                    *(luma1++) = *(buf32++);
                    *(luma2++) = *(buf32++);
                    *(luma2++) = *(buf32++);
                    *(cr++) = *(buf32++);
                    *(cb++) = *(buf32++);
                }
            }
        }
        break;

    case 1:
        /* Fraps v1 is an upside-down BGR24 */
        if (!prev_pic_bit)
            expected_size += avctx->width * avctx->height * 3;
        if (buf_size != expected_size) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid frame length %d (should be %d)\n",
                   buf_size, expected_size);
            return AVERROR_INVALIDDATA;
        }

        if ((ret = ff_reget_buffer(avctx, f)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
            return ret;
        }
        f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
        f->key_frame = f->pict_type == AV_PICTURE_TYPE_I;

        if (f->pict_type == AV_PICTURE_TYPE_I) {
            for (y = 0; y<avctx->height; y++)
                memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
                       &buf[y * avctx->width * 3],
                       3 * avctx->width);
        }
        break;

    case 2:
    case 4:
        /**
         * Fraps v2 is Huffman-coded YUV420 planes
         * Fraps v4 is virtually the same
         */
        planes = 3;
        if ((ret = ff_reget_buffer(avctx, f)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
            return ret;
        }
        /* skip frame */
        if (buf_size == 8) {
            f->pict_type = AV_PICTURE_TYPE_P;
            f->key_frame = 0;
            break;
        }
        f->pict_type = AV_PICTURE_TYPE_I;
        f->key_frame = 1;
        if ((AV_RL32(buf) != FPS_TAG) || (buf_size < (planes * 1024 + 24))) {
            av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
            return AVERROR_INVALIDDATA;
        }
        for (i = 0; i < planes; i++) {
            offs[i] = AV_RL32(buf + 4 + i * 4);
            if (offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
                av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
                return AVERROR_INVALIDDATA;
            }
        }
        offs[planes] = buf_size;
        for (i = 0; i < planes; i++) {
            is_chroma = !!i;
            av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size,
                                  offs[i + 1] - offs[i] - 1024);
            if (!s->tmpbuf)
                return AVERROR(ENOMEM);
            if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
                                           avctx->width  >> is_chroma,
                                           avctx->height >> is_chroma,
                                           buf + offs[i], offs[i + 1] - offs[i],
                                           is_chroma, 1)) < 0) {
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
                return ret;
            }
        }
        break;
    case 3:
    case 5:
        /* Virtually the same as version 4, but is for RGB24 */
        planes = 3;
        if ((ret = ff_reget_buffer(avctx, f)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
            return ret;
        }
        /* skip frame */
        if (buf_size == 8) {
            f->pict_type = AV_PICTURE_TYPE_P;
            f->key_frame = 0;
            break;
        }
        f->pict_type = AV_PICTURE_TYPE_I;
        f->key_frame = 1;
        if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
            av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
            return AVERROR_INVALIDDATA;
        }
        for (i = 0; i < planes; i++) {
            offs[i] = AV_RL32(buf + 4 + i * 4);
            if (offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
                av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
                return AVERROR_INVALIDDATA;
            }
        }
        offs[planes] = buf_size;
        for (i = 0; i < planes; i++) {
            av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size,
                                  offs[i + 1] - offs[i] - 1024);
            if (!s->tmpbuf)
                return AVERROR(ENOMEM);
            if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
                                           -f->linesize[0], avctx->width, avctx->height,
                                           buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
                return ret;
            }
        }
        // convert pseudo-YUV into real RGB
        for (j = 0; j < avctx->height; j++) {
            for (i = 0; i < avctx->width; i++) {
                f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
                f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
            }
        }
        break;
    }

    if ((ret = av_frame_ref(frame, f)) < 0)
        return ret;
    *got_frame = 1;

    return buf_size;
}


/**
 * closes decoder
 * @param avctx codec context
 * @return 0 on success or negative if fails
 */
static av_cold int decode_end(AVCodecContext *avctx)
{
    FrapsContext *s = (FrapsContext*)avctx->priv_data;

    av_frame_free(&s->frame);

    av_freep(&s->tmpbuf);
    return 0;
}


AVCodec ff_fraps_decoder = {
    .name           = "fraps",
    .long_name      = NULL_IF_CONFIG_SMALL("Fraps"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_FRAPS,
    .priv_data_size = sizeof(FrapsContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};