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/*
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 * IBM Ultimotion Video Decoder
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 * Copyright (C) 2004 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
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/**
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 * @file ulti.c
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 * IBM Ultimotion Video Decoder.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "avcodec.h"
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#include "ulti_cb.h"
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typedef struct UltimotionDecodeContext {
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    AVCodecContext *avctx;
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    int width, height, blocks;
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    AVFrame frame;
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    const uint8_t *ulti_codebook;
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} UltimotionDecodeContext;
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static int ulti_decode_init(AVCodecContext *avctx)
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{
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    UltimotionDecodeContext *s = avctx->priv_data;
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    s->avctx = avctx;
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    s->width = avctx->width;
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    s->height = avctx->height;
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    s->blocks = (s->width / 8) * (s->height / 8);
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    avctx->pix_fmt = PIX_FMT_YUV410P;
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    avctx->coded_frame = (AVFrame*) &s->frame;
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    s->ulti_codebook = ulti_codebook;
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    return 0;
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}
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static int block_coords[8] = // 4x4 block coords in 8x8 superblock
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    { 0, 0, 0, 4, 4, 4, 4, 0};
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static int angle_by_index[4] = { 0, 2, 6, 12};
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/* Lookup tables for luma and chroma - used by ulti_convert_yuv() */
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static uint8_t ulti_lumas[64] =
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    { 0x10, 0x13, 0x17, 0x1A, 0x1E, 0x21, 0x25, 0x28,
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      0x2C, 0x2F, 0x33, 0x36, 0x3A, 0x3D, 0x41, 0x44,
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      0x48, 0x4B, 0x4F, 0x52, 0x56, 0x59, 0x5C, 0x60,
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      0x63, 0x67, 0x6A, 0x6E, 0x71, 0x75, 0x78, 0x7C,
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      0x7F, 0x83, 0x86, 0x8A, 0x8D, 0x91, 0x94, 0x98,
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      0x9B, 0x9F, 0xA2, 0xA5, 0xA9, 0xAC, 0xB0, 0xB3,
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      0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8, 0xCC, 0xCF,
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      0xD3, 0xD6, 0xDA, 0xDD, 0xE1, 0xE4, 0xE8, 0xEB};
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static uint8_t ulti_chromas[16] =
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    { 0x60, 0x67, 0x6D, 0x73, 0x7A, 0x80, 0x86, 0x8D,
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      0x93, 0x99, 0xA0, 0xA6, 0xAC, 0xB3, 0xB9, 0xC0};
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/* convert Ultimotion YUV block (sixteen 6-bit Y samples and
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 two 4-bit chroma samples) into standard YUV and put it into frame */
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static void ulti_convert_yuv(AVFrame *frame, int x, int y,
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                             uint8_t *luma,int chroma)
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{
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    uint8_t *y_plane, *cr_plane, *cb_plane;
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    int i;
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    y_plane = frame->data[0] + x + y * frame->linesize[0];
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    cr_plane = frame->data[1] + (x / 4) + (y / 4) * frame->linesize[1];
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    cb_plane = frame->data[2] + (x / 4) + (y / 4) * frame->linesize[2];
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    cr_plane[0] = ulti_chromas[chroma >> 4];
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    cb_plane[0] = ulti_chromas[chroma & 0xF];
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    for(i = 0; i < 16; i++){
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        y_plane[i & 3] = ulti_lumas[luma[i]];
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        if((i & 3) == 3) { //next row
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            y_plane += frame->linesize[0];
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        }
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    }
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}
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/* generate block like in MS Video1 */
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static void ulti_pattern(AVFrame *frame, int x, int y,
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                         int f0, int f1, int Y0, int Y1, int chroma)
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{
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    uint8_t Luma[16];
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    int mask, i;
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    for(mask = 0x80, i = 0; mask; mask >>= 1, i++) {
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        if(f0 & mask)
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            Luma[i] = Y1;
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        else
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            Luma[i] = Y0;
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    }
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    for(mask = 0x80, i = 8; mask; mask >>= 1, i++) {
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        if(f1 & mask)
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            Luma[i] = Y1;
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        else
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            Luma[i] = Y0;
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    }
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    ulti_convert_yuv(frame, x, y, Luma, chroma);
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}
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/* fill block with some gradient */
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static void ulti_grad(AVFrame *frame, int x, int y, uint8_t *Y, int chroma, int angle)
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{
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    uint8_t Luma[16];
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    if(angle & 8) { //reverse order
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        int t;
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        angle &= 0x7;
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        t = Y[0];
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        Y[0] = Y[3];
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        Y[3] = t;
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        t = Y[1];
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        Y[1] = Y[2];
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        Y[2] = t;
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    }
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    switch(angle){
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    case 0:
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        Luma[0]  = Y[0]; Luma[1]  = Y[1]; Luma[2]  = Y[2]; Luma[3]  = Y[3];
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        Luma[4]  = Y[0]; Luma[5]  = Y[1]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
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        Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
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        Luma[12] = Y[0]; Luma[13] = Y[1]; Luma[14] = Y[2]; Luma[15] = Y[3];
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        break;
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    case 1:
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        Luma[0]  = Y[1]; Luma[1]  = Y[2]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
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        Luma[4]  = Y[0]; Luma[5]  = Y[1]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
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        Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[2]; Luma[11] = Y[3];
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        Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
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        break;
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    case 2:
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        Luma[0]  = Y[1]; Luma[1]  = Y[2]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
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        Luma[4]  = Y[1]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
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        Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
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        Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[1]; Luma[15] = Y[2];
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        break;
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    case 3:
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        Luma[0]  = Y[2]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
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        Luma[4]  = Y[1]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[3];
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        Luma[8]  = Y[0]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[2];
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        Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[1];
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        break;
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    case 4:
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        Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[3];
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        Luma[4]  = Y[2]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[2];
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        Luma[8]  = Y[1]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[1];
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        Luma[12] = Y[0]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
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        break;
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    case 5:
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        Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[3]; Luma[3]  = Y[2];
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        Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[2]; Luma[7]  = Y[1];
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        Luma[8]  = Y[2]; Luma[9]  = Y[1]; Luma[10] = Y[1]; Luma[11] = Y[0];
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        Luma[12] = Y[1]; Luma[13] = Y[0]; Luma[14] = Y[0]; Luma[15] = Y[0];
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        break;
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    case 6:
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        Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[2]; Luma[3]  = Y[2];
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        Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[1]; Luma[7]  = Y[1];
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        Luma[8]  = Y[2]; Luma[9]  = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
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        Luma[12] = Y[1]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
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        break;
184
    case 7:
185
        Luma[0]  = Y[3]; Luma[1]  = Y[3]; Luma[2]  = Y[2]; Luma[3]  = Y[1];
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        Luma[4]  = Y[3]; Luma[5]  = Y[2]; Luma[6]  = Y[1]; Luma[7]  = Y[0];
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        Luma[8]  = Y[3]; Luma[9]  = Y[2]; Luma[10] = Y[1]; Luma[11] = Y[0];
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        Luma[12] = Y[2]; Luma[13] = Y[1]; Luma[14] = Y[0]; Luma[15] = Y[0];
189
        break;
190
    default:
191
        Luma[0]  = Y[0]; Luma[1]  = Y[0]; Luma[2]  = Y[1]; Luma[3]  = Y[1];
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        Luma[4]  = Y[0]; Luma[5]  = Y[0]; Luma[6]  = Y[1]; Luma[7]  = Y[1];
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        Luma[8]  = Y[2]; Luma[9]  = Y[2]; Luma[10] = Y[3]; Luma[11] = Y[3];
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        Luma[12] = Y[2]; Luma[13] = Y[2]; Luma[14] = Y[3]; Luma[15] = Y[3];
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        break;
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    }
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    ulti_convert_yuv(frame, x, y, Luma, chroma);
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}
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static int ulti_decode_frame(AVCodecContext *avctx,
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                             void *data, int *data_size,
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                             uint8_t *buf, int buf_size)
204
{
205
    UltimotionDecodeContext *s=avctx->priv_data;
206
    int modifier = 0;
207
    int uniq = 0;
208
    int mode = 0;
209
    int blocks = 0;
210
    int done = 0;
211
    int x = 0, y = 0;
212
    int i;
213
    int skip;
214
    int tmp;
215

    
216
    if(s->frame.data[0])
217
        avctx->release_buffer(avctx, &s->frame);
218

    
219
    s->frame.reference = 1;
220
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
221
    if(avctx->get_buffer(avctx, &s->frame) < 0) {
222
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
223
        return -1;
224
    }
225

    
226
    while(!done) {
227
        int idx;
228
        if(blocks >= s->blocks || y >= s->height)
229
            break;//all blocks decoded
230

    
231
        idx = *buf++;
232
        if((idx & 0xF8) == 0x70) {
233
            switch(idx) {
234
            case 0x70: //change modifier
235
                modifier = *buf++;
236
                if(modifier>1)
237
                    av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
238
                break;
239
            case 0x71: // set uniq flag
240
                uniq = 1;
241
                break;
242
            case 0x72: //toggle mode
243
                mode = !mode;
244
                break;
245
            case 0x73: //end-of-frame
246
                done = 1;
247
                break;
248
            case 0x74: //skip some blocks
249
                skip = *buf++;
250
                if ((blocks + skip) >= s->blocks)
251
                    break;
252
                blocks += skip;
253
                x += skip * 8;
254
                while(x >= s->width) {
255
                    x -= s->width;
256
                    y += 8;
257
                }
258
                break;
259
            default:
260
                av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
261
            }
262
        } else { //handle one block
263
            int code;
264
            int cf;
265
            int angle = 0;
266
            uint8_t Y[4]; // luma samples of block
267
            int tx = 0, ty = 0; //coords of subblock
268
            int chroma = 0;
269
            if (mode || uniq) {
270
                uniq = 0;
271
                cf = 1;
272
                chroma = 0;
273
            } else {
274
                cf = 0;
275
                if (idx)
276
                    chroma = *buf++;
277
            }
278
            for (i = 0; i < 4; i++) { // for every subblock
279
                code = (idx >> (6 - i*2)) & 3; //extract 2 bits
280
                if(!code) //skip subblock
281
                    continue;
282
                if(cf)
283
                    chroma = *buf++;
284
                tx = x + block_coords[i * 2];
285
                ty = y + block_coords[(i * 2) + 1];
286
                switch(code) {
287
                case 1:
288
                    tmp = *buf++;
289

    
290
                    angle = angle_by_index[(tmp >> 6) & 0x3];
291

    
292
                    Y[0] = tmp & 0x3F;
293
                    Y[1] = Y[0];
294

    
295
                    if (angle) {
296
                        Y[2] = Y[0]+1;
297
                        if (Y[2] > 0x3F)
298
                            Y[2] = 0x3F;
299
                        Y[3] = Y[2];
300
                    } else {
301
                        Y[2] = Y[0];
302
                        Y[3] = Y[0];
303
                    }
304
                    break;
305

    
306
                case 2:
307
                    if (modifier) { // unpack four luma samples
308
                        tmp = (*buf++) << 16;
309
                        tmp += (*buf++) << 8;
310
                        tmp += *buf++;
311

    
312
                        Y[0] = (tmp >> 18) & 0x3F;
313
                        Y[1] = (tmp >> 12) & 0x3F;
314
                        Y[2] = (tmp >> 6) & 0x3F;
315
                        Y[3] = tmp & 0x3F;
316
                        angle = 16;
317
                    } else { // retrieve luma samples from codebook
318
                        tmp = (*buf++) << 8;
319
                        tmp += (*buf++);
320

    
321
                        angle = (tmp >> 12) & 0xF;
322
                        tmp &= 0xFFF;
323
                        tmp <<= 2;
324
                        Y[0] = s->ulti_codebook[tmp];
325
                        Y[1] = s->ulti_codebook[tmp + 1];
326
                        Y[2] = s->ulti_codebook[tmp + 2];
327
                        Y[3] = s->ulti_codebook[tmp + 3];
328
                    }
329
                    break;
330

    
331
                case 3:
332
                    if (modifier) { // all 16 luma samples
333
                        uint8_t Luma[16];
334

    
335
                        tmp = (*buf++) << 16;
336
                        tmp += (*buf++) << 8;
337
                        tmp += *buf++;
338
                        Luma[0] = (tmp >> 18) & 0x3F;
339
                        Luma[1] = (tmp >> 12) & 0x3F;
340
                        Luma[2] = (tmp >> 6) & 0x3F;
341
                        Luma[3] = tmp & 0x3F;
342

    
343
                        tmp = (*buf++) << 16;
344
                        tmp += (*buf++) << 8;
345
                        tmp += *buf++;
346
                        Luma[4] = (tmp >> 18) & 0x3F;
347
                        Luma[5] = (tmp >> 12) & 0x3F;
348
                        Luma[6] = (tmp >> 6) & 0x3F;
349
                        Luma[7] = tmp & 0x3F;
350

    
351
                        tmp = (*buf++) << 16;
352
                        tmp += (*buf++) << 8;
353
                        tmp += *buf++;
354
                        Luma[8] = (tmp >> 18) & 0x3F;
355
                        Luma[9] = (tmp >> 12) & 0x3F;
356
                        Luma[10] = (tmp >> 6) & 0x3F;
357
                        Luma[11] = tmp & 0x3F;
358

    
359
                        tmp = (*buf++) << 16;
360
                        tmp += (*buf++) << 8;
361
                        tmp += *buf++;
362
                        Luma[12] = (tmp >> 18) & 0x3F;
363
                        Luma[13] = (tmp >> 12) & 0x3F;
364
                        Luma[14] = (tmp >> 6) & 0x3F;
365
                        Luma[15] = tmp & 0x3F;
366

    
367
                        ulti_convert_yuv(&s->frame, tx, ty, Luma, chroma);
368
                    } else {
369
                        tmp = *buf++;
370
                        if(tmp & 0x80) {
371
                            angle = (tmp >> 4) & 0x7;
372
                            tmp = (tmp << 8) + *buf++;
373
                            Y[0] = (tmp >> 6) & 0x3F;
374
                            Y[1] = tmp & 0x3F;
375
                            Y[2] = (*buf++) & 0x3F;
376
                            Y[3] = (*buf++) & 0x3F;
377
                            ulti_grad(&s->frame, tx, ty, Y, chroma, angle); //draw block
378
                        } else { // some patterns
379
                            int f0, f1;
380
                            f0 = *buf++;
381
                            f1 = tmp;
382
                            Y[0] = (*buf++) & 0x3F;
383
                            Y[1] = (*buf++) & 0x3F;
384
                            ulti_pattern(&s->frame, tx, ty, f1, f0, Y[0], Y[1], chroma);
385
                        }
386
                    }
387
                    break;
388
                }
389
                if(code != 3)
390
                    ulti_grad(&s->frame, tx, ty, Y, chroma, angle); // draw block
391
            }
392
            blocks++;
393
                x += 8;
394
            if(x >= s->width) {
395
                x = 0;
396
                y += 8;
397
            }
398
        }
399
    }
400

    
401
    *data_size=sizeof(AVFrame);
402
    *(AVFrame*)data= s->frame;
403

    
404
    return buf_size;
405
}
406

    
407
static int ulti_decode_end(AVCodecContext *avctx)
408
{
409
/*    UltimotionDecodeContext *s = avctx->priv_data;*/
410

    
411
    return 0;
412
}
413

    
414
AVCodec ulti_decoder = {
415
    "ultimotion",
416
    CODEC_TYPE_VIDEO,
417
    CODEC_ID_ULTI,
418
    sizeof(UltimotionDecodeContext),
419
    ulti_decode_init,
420
    NULL,
421
    ulti_decode_end,
422
    ulti_decode_frame,
423
    CODEC_CAP_DR1,
424
    NULL
425
};
426