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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 Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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 * @file
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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 "avcodec.h"
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#include "bytestream.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 av_cold 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 av_cold int ulti_decode_end(AVCodecContext *avctx){
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    UltimotionDecodeContext *s = avctx->priv_data;
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    AVFrame *pic = &s->frame;
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    if (pic->data[0])
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        avctx->release_buffer(avctx, pic);
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    return 0;
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}
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static const 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 const 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 const 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 const 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;
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    case 7:
194
        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];
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        break;
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    default:
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        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,
212
                             AVPacket *avpkt)
213
{
214
    const uint8_t *buf = avpkt->data;
215
    int buf_size = avpkt->size;
216
    UltimotionDecodeContext *s=avctx->priv_data;
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    int modifier = 0;
218
    int uniq = 0;
219
    int mode = 0;
220
    int blocks = 0;
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    int done = 0;
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    int x = 0, y = 0;
223
    int i;
224
    int skip;
225
    int tmp;
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227
    if(s->frame.data[0])
228
        avctx->release_buffer(avctx, &s->frame);
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230
    s->frame.reference = 1;
231
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
232
    if(avctx->get_buffer(avctx, &s->frame) < 0) {
233
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
234
        return -1;
235
    }
236

    
237
    while(!done) {
238
        int idx;
239
        if(blocks >= s->blocks || y >= s->height)
240
            break;//all blocks decoded
241

    
242
        idx = *buf++;
243
        if((idx & 0xF8) == 0x70) {
244
            switch(idx) {
245
            case 0x70: //change modifier
246
                modifier = *buf++;
247
                if(modifier>1)
248
                    av_log(avctx, AV_LOG_INFO, "warning: modifier must be 0 or 1, got %i\n", modifier);
249
                break;
250
            case 0x71: // set uniq flag
251
                uniq = 1;
252
                break;
253
            case 0x72: //toggle mode
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                mode = !mode;
255
                break;
256
            case 0x73: //end-of-frame
257
                done = 1;
258
                break;
259
            case 0x74: //skip some blocks
260
                skip = *buf++;
261
                if ((blocks + skip) >= s->blocks)
262
                    break;
263
                blocks += skip;
264
                x += skip * 8;
265
                while(x >= s->width) {
266
                    x -= s->width;
267
                    y += 8;
268
                }
269
                break;
270
            default:
271
                av_log(avctx, AV_LOG_INFO, "warning: unknown escape 0x%02X\n", idx);
272
            }
273
        } else { //handle one block
274
            int code;
275
            int cf;
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            int angle = 0;
277
            uint8_t Y[4]; // luma samples of block
278
            int tx = 0, ty = 0; //coords of subblock
279
            int chroma = 0;
280
            if (mode || uniq) {
281
                uniq = 0;
282
                cf = 1;
283
                chroma = 0;
284
            } else {
285
                cf = 0;
286
                if (idx)
287
                    chroma = *buf++;
288
            }
289
            for (i = 0; i < 4; i++) { // for every subblock
290
                code = (idx >> (6 - i*2)) & 3; //extract 2 bits
291
                if(!code) //skip subblock
292
                    continue;
293
                if(cf)
294
                    chroma = *buf++;
295
                tx = x + block_coords[i * 2];
296
                ty = y + block_coords[(i * 2) + 1];
297
                switch(code) {
298
                case 1:
299
                    tmp = *buf++;
300

    
301
                    angle = angle_by_index[(tmp >> 6) & 0x3];
302

    
303
                    Y[0] = tmp & 0x3F;
304
                    Y[1] = Y[0];
305

    
306
                    if (angle) {
307
                        Y[2] = Y[0]+1;
308
                        if (Y[2] > 0x3F)
309
                            Y[2] = 0x3F;
310
                        Y[3] = Y[2];
311
                    } else {
312
                        Y[2] = Y[0];
313
                        Y[3] = Y[0];
314
                    }
315
                    break;
316

    
317
                case 2:
318
                    if (modifier) { // unpack four luma samples
319
                        tmp = bytestream_get_be24(&buf);
320

    
321
                        Y[0] = (tmp >> 18) & 0x3F;
322
                        Y[1] = (tmp >> 12) & 0x3F;
323
                        Y[2] = (tmp >> 6) & 0x3F;
324
                        Y[3] = tmp & 0x3F;
325
                        angle = 16;
326
                    } else { // retrieve luma samples from codebook
327
                        tmp = bytestream_get_be16(&buf);
328

    
329
                        angle = (tmp >> 12) & 0xF;
330
                        tmp &= 0xFFF;
331
                        tmp <<= 2;
332
                        Y[0] = s->ulti_codebook[tmp];
333
                        Y[1] = s->ulti_codebook[tmp + 1];
334
                        Y[2] = s->ulti_codebook[tmp + 2];
335
                        Y[3] = s->ulti_codebook[tmp + 3];
336
                    }
337
                    break;
338

    
339
                case 3:
340
                    if (modifier) { // all 16 luma samples
341
                        uint8_t Luma[16];
342

    
343
                        tmp = bytestream_get_be24(&buf);
344
                        Luma[0] = (tmp >> 18) & 0x3F;
345
                        Luma[1] = (tmp >> 12) & 0x3F;
346
                        Luma[2] = (tmp >> 6) & 0x3F;
347
                        Luma[3] = tmp & 0x3F;
348

    
349
                        tmp = bytestream_get_be24(&buf);
350
                        Luma[4] = (tmp >> 18) & 0x3F;
351
                        Luma[5] = (tmp >> 12) & 0x3F;
352
                        Luma[6] = (tmp >> 6) & 0x3F;
353
                        Luma[7] = tmp & 0x3F;
354

    
355
                        tmp = bytestream_get_be24(&buf);
356
                        Luma[8] = (tmp >> 18) & 0x3F;
357
                        Luma[9] = (tmp >> 12) & 0x3F;
358
                        Luma[10] = (tmp >> 6) & 0x3F;
359
                        Luma[11] = tmp & 0x3F;
360

    
361
                        tmp = bytestream_get_be24(&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
AVCodec ff_ulti_decoder = {
408
    "ultimotion",
409
    AVMEDIA_TYPE_VIDEO,
410
    CODEC_ID_ULTI,
411
    sizeof(UltimotionDecodeContext),
412
    ulti_decode_init,
413
    NULL,
414
    ulti_decode_end,
415
    ulti_decode_frame,
416
    CODEC_CAP_DR1,
417
    NULL,
418
    .long_name = NULL_IF_CONFIG_SMALL("IBM UltiMotion"),
419
};
420