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/*
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 * Duck/ON2 TrueMotion 2 Decoder
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 * Copyright (c) 2005 Konstantin Shishkov
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 *
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 * This library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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 this library; 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 truemotion2.c
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 * Duck TrueMotion2 decoder.
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 */
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#include "avcodec.h"
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#include "common.h"
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#include "bitstream.h"
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#include "dsputil.h"
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#define TM2_ESCAPE 0x80000000
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#define TM2_DELTAS 64
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/* Huffman-coded streams of different types of blocks */
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enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
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     TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
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/* Block types */
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enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
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                 TM2_UPDATE, TM2_STILL, TM2_MOTION};
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typedef struct TM2Context{
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    AVCodecContext *avctx;
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    AVFrame pic;
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    GetBitContext gb;
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    DSPContext dsp;
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    /* TM2 streams */
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    int *tokens[TM2_NUM_STREAMS];
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    int tok_lens[TM2_NUM_STREAMS];
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    int tok_ptrs[TM2_NUM_STREAMS];
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    int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
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    /* for blocks decoding */
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    int D[4];
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    int CD[4];
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    int *last;
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    int *clast;
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    /* data for current and previous frame */
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    int *Y1, *U1, *V1, *Y2, *U2, *V2;
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    int cur;
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} TM2Context;
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/**
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* Huffman codes for each of streams
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*/
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typedef struct TM2Codes{
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    VLC vlc; ///< table for FFmpeg bitstream reader
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    int bits;
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    int *recode; ///< table for converting from code indexes to values
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    int length;
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} TM2Codes;
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/**
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* structure for gathering Huffman codes information
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*/
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typedef struct TM2Huff{
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    int val_bits; ///< length of literal
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    int max_bits; ///< maximum length of code
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    int min_bits; ///< minimum length of code
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    int nodes; ///< total number of nodes in tree
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    int num; ///< current number filled
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    int max_num; ///< total number of codes
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    int *nums; ///< literals
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    uint32_t *bits; ///< codes
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    int *lens; ///< codelengths
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} TM2Huff;
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static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
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{
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    if(length > huff->max_bits) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
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        return -1;
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    }
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    if(!get_bits1(&ctx->gb)) { /* literal */
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        if (length == 0) {
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            length = 1;
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        }
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        if(huff->num >= huff->max_num) {
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            av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
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            return -1;
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        }
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        huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
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        huff->bits[huff->num] = prefix;
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        huff->lens[huff->num] = length;
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        huff->num++;
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        return 0;
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    } else { /* non-terminal node */
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        if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
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            return -1;
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        if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
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            return -1;
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    }
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    return 0;
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}
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static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
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{
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    TM2Huff huff;
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    int res = 0;
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    huff.val_bits = get_bits(&ctx->gb, 5);
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    huff.max_bits = get_bits(&ctx->gb, 5);
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    huff.min_bits = get_bits(&ctx->gb, 5);
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    huff.nodes = get_bits_long(&ctx->gb, 17);
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    huff.num = 0;
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    /* check for correct codes parameters */
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    if((huff.val_bits < 1) || (huff.val_bits > 32) ||
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       (huff.max_bits < 0) || (huff.max_bits > 32)) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
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               huff.val_bits, huff.max_bits);
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        return -1;
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    }
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    if((huff.nodes < 0) || (huff.nodes > 0x10000)) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
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        return -1;
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    }
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    /* one-node tree */
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    if(huff.max_bits == 0)
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        huff.max_bits = 1;
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    /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
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    huff.max_num = (huff.nodes + 1) >> 1;
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    huff.nums = av_mallocz(huff.max_num * sizeof(int));
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    huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
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    huff.lens = av_mallocz(huff.max_num * sizeof(int));
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    if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
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        res = -1;
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    if(huff.num != huff.max_num) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
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               huff.num, huff.max_num);
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        res = -1;
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    }
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    /* convert codes to vlc_table */
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    if(res != -1) {
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        int i;
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        res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
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                    huff.lens, sizeof(int), sizeof(int),
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                    huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
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        if(res < 0) {
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            av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
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            res = -1;
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        } else
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            res = 0;
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        if(res != -1) {
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            code->bits = huff.max_bits;
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            code->length = huff.max_num;
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            code->recode = av_malloc(code->length * sizeof(int));
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            for(i = 0; i < code->length; i++)
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                code->recode[i] = huff.nums[i];
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        }
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    }
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    /* free allocated memory */
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    av_free(huff.nums);
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    av_free(huff.bits);
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    av_free(huff.lens);
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    return res;
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}
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static void tm2_free_codes(TM2Codes *code)
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{
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    if(code->recode)
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        av_free(code->recode);
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    if(code->vlc.table)
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        free_vlc(&code->vlc);
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}
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static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
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{
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    int val;
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    val = get_vlc2(gb, code->vlc.table, code->bits, 1);
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    return code->recode[val];
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}
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static inline int tm2_read_header(TM2Context *ctx, uint8_t *buf)
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{
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    uint32_t magic;
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    uint8_t *obuf;
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    int length;
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    obuf = buf;
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    magic = LE_32(buf);
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    buf += 4;
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    if(magic == 0x00000100) { /* old header */
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/*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
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        return 40;
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    } else if(magic == 0x00000101) { /* new header */
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        int w, h, size, flags, xr, yr;
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        length = LE_32(buf);
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        buf += 4;
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        init_get_bits(&ctx->gb, buf, 32 * 8);
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        size = get_bits_long(&ctx->gb, 31);
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        h = get_bits(&ctx->gb, 15);
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        w = get_bits(&ctx->gb, 15);
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        flags = get_bits_long(&ctx->gb, 31);
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        yr = get_bits(&ctx->gb, 9);
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        xr = get_bits(&ctx->gb, 9);
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        return 40;
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    } else {
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        av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
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        return -1;
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    }
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    return (buf - obuf);
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}
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static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
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    int d, mb;
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    int i, v;
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    d = get_bits(&ctx->gb, 9);
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    mb = get_bits(&ctx->gb, 5);
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    if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
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        return -1;
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    }
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    for(i = 0; i < d; i++) {
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        v = get_bits_long(&ctx->gb, mb);
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        if(v & (1 << (mb - 1)))
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            ctx->deltas[stream_id][i] = v - (1 << mb);
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        else
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            ctx->deltas[stream_id][i] = v;
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    }
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    for(; i < TM2_DELTAS; i++)
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        ctx->deltas[stream_id][i] = 0;
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    return 0;
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}
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static int tm2_read_stream(TM2Context *ctx, uint8_t *buf, int stream_id) {
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    int i;
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    int cur = 0;
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    int skip = 0;
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    int len, toks;
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    TM2Codes codes;
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    /* get stream length in dwords */
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    len = BE_32(buf); buf += 4; cur += 4;
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    skip = len * 4 + 4;
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    if(len == 0)
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        return 4;
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    toks = BE_32(buf); buf += 4; cur += 4;
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    if(toks & 1) {
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        len = BE_32(buf); buf += 4; cur += 4;
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        if(len == TM2_ESCAPE) {
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            len = BE_32(buf); buf += 4; cur += 4;
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        }
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        if(len > 0) {
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            init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
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            if(tm2_read_deltas(ctx, stream_id) == -1)
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                return -1;
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            buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
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            cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
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        }
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    }
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    /* skip unused fields */
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    if(BE_32(buf) == TM2_ESCAPE) {
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        buf += 4; cur += 4; /* some unknown length - could be escaped too */
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    }
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    buf += 4; cur += 4;
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    buf += 4; cur += 4; /* unused by decoder */
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    init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
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    if(tm2_build_huff_table(ctx, &codes) == -1)
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        return -1;
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    buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
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    cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
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    toks >>= 1;
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    /* check if we have sane number of tokens */
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    if((toks < 0) || (toks > 0xFFFFFF)){
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        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
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        tm2_free_codes(&codes);
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        return -1;
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    }
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    ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
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    ctx->tok_lens[stream_id] = toks;
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    len = BE_32(buf); buf += 4; cur += 4;
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    if(len > 0) {
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        init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
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        for(i = 0; i < toks; i++)
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            ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
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    } else {
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        for(i = 0; i < toks; i++)
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            ctx->tokens[stream_id][i] = codes.recode[0];
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    }
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    tm2_free_codes(&codes);
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    return skip;
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}
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static inline int GET_TOK(TM2Context *ctx,int type) {
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    if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);
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        return 0;
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    }
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    if(type <= TM2_MOT)
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        return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
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    return ctx->tokens[type][ctx->tok_ptrs[type]++];
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}
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/* blocks decoding routines */
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/* common Y, U, V pointers initialisation */
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#define TM2_INIT_POINTERS() \
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    int *last, *clast; \
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    int *Y, *U, *V;\
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    int Ystride, Ustride, Vstride;\
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\
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    Ystride = ctx->avctx->width;\
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    Vstride = (ctx->avctx->width + 1) >> 1;\
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    Ustride = (ctx->avctx->width + 1) >> 1;\
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    Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
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    V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
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    U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
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    last = ctx->last + bx * 4;\
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    clast = ctx->clast + bx * 4;
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#define TM2_INIT_POINTERS_2() \
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    int *Yo, *Uo, *Vo;\
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    int oYstride, oUstride, oVstride;\
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\
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    TM2_INIT_POINTERS();\
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    oYstride = Ystride;\
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    oVstride = Vstride;\
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    oUstride = Ustride;\
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    Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
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    Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
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    Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
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/* recalculate last and delta values for next blocks */
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#define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
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    CD[0] = (CHR[1] - 128) - last[1];\
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    CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
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    last[0] = (int)CHR[stride + 0] - 128;\
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    last[1] = (int)CHR[stride + 1] - 128;}
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/* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
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static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
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{
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    int ct, d;
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    int i, j;
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    for(j = 0; j < 4; j++){
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        ct = ctx->D[j];
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        for(i = 0; i < 4; i++){
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            d = deltas[i + j * 4];
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            ct += d;
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            last[i] += ct;
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            Y[i] = clip_uint8(last[i]);
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        }
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        Y += stride;
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        ctx->D[j] = ct;
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    }
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}
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static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
393
{
394
    int i, j;
395
    for(j = 0; j < 2; j++){
396
        for(i = 0; i < 2; i++){
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            CD[j] += deltas[i + j * 2];
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            last[i] += CD[j];
399
            data[i] = last[i] + 128;
400
        }
401
        data += stride;
402
    }
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}
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static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
406
{
407
    int t;
408
    int l;
409
    int prev;
410
411
    if(bx > 0)
412
        prev = clast[-3];
413
    else
414
        prev = 0;
415
    t = (CD[0] + CD[1]) >> 1;
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    l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
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    CD[1] = CD[0] + CD[1] - t;
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    CD[0] = t;
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    clast[0] = l;
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    tm2_high_chroma(data, stride, clast, CD, deltas);
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}
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static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
425
{
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    int i;
427
    int deltas[16];
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    TM2_INIT_POINTERS();
429
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    /* hi-res chroma */
431
    for(i = 0; i < 4; i++) {
432
        deltas[i] = GET_TOK(ctx, TM2_C_HI);
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        deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
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    }
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    tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
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    tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
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    /* hi-res luma */
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    for(i = 0; i < 16; i++)
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        deltas[i] = GET_TOK(ctx, TM2_L_HI);
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    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
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}
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static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
446
{
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    int i;
448
    int deltas[16];
449
    TM2_INIT_POINTERS();
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    /* low-res chroma */
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    deltas[0] = GET_TOK(ctx, TM2_C_LO);
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    deltas[1] = deltas[2] = deltas[3] = 0;
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    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
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    deltas[0] = GET_TOK(ctx, TM2_C_LO);
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    deltas[1] = deltas[2] = deltas[3] = 0;
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    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
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    /* hi-res luma */
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    for(i = 0; i < 16; i++)
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        deltas[i] = GET_TOK(ctx, TM2_L_HI);
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    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
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}
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static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
468
{
469
    int i;
470
    int t1, t2;
471
    int deltas[16];
472
    TM2_INIT_POINTERS();
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    /* low-res chroma */
475
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
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    deltas[1] = deltas[2] = deltas[3] = 0;
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    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
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    deltas[0] = GET_TOK(ctx, TM2_C_LO);
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    deltas[1] = deltas[2] = deltas[3] = 0;
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    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
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    /* low-res luma */
484
    for(i = 0; i < 16; i++)
485
        deltas[i] = 0;
486 115329f1 Diego Biurrun
487 64af6168 Mike Melanson
    deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
488
    deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
489
    deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
490
    deltas[10] = GET_TOK(ctx, TM2_L_LO);
491 115329f1 Diego Biurrun
492 64af6168 Mike Melanson
    if(bx > 0)
493
        last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
494
    else
495
        last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
496
    last[2] = (last[1] + last[3]) >> 1;
497
498
    t1 = ctx->D[0] + ctx->D[1];
499
    ctx->D[0] = t1 >> 1;
500
    ctx->D[1] = t1 - (t1 >> 1);
501
    t2 = ctx->D[2] + ctx->D[3];
502
    ctx->D[2] = t2 >> 1;
503
    ctx->D[3] = t2 - (t2 >> 1);
504 115329f1 Diego Biurrun
505 64af6168 Mike Melanson
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
506
}
507
508
static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
509
{
510
    int i;
511
    int ct;
512
    int left, right, diff;
513
    int deltas[16];
514
    TM2_INIT_POINTERS();
515 115329f1 Diego Biurrun
516 64af6168 Mike Melanson
    /* null chroma */
517
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
518
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
519
520
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
521
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
522 115329f1 Diego Biurrun
523 64af6168 Mike Melanson
    /* null luma */
524
    for(i = 0; i < 16; i++)
525
        deltas[i] = 0;
526
527
    ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
528 115329f1 Diego Biurrun
529 64af6168 Mike Melanson
    if(bx > 0)
530
        left = last[-1] - ct;
531
    else
532
        left = 0;
533 115329f1 Diego Biurrun
534 64af6168 Mike Melanson
    right = last[3];
535
    diff = right - left;
536
    last[0] = left + (diff >> 2);
537
    last[1] = left + (diff >> 1);
538
    last[2] = right - (diff >> 2);
539
    last[3] = right;
540
    {
541
        int tp = left;
542 115329f1 Diego Biurrun
543 64af6168 Mike Melanson
        ctx->D[0] = (tp + (ct >> 2)) - left;
544
        left += ctx->D[0];
545
        ctx->D[1] = (tp + (ct >> 1)) - left;
546
        left += ctx->D[1];
547
        ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
548
        left += ctx->D[2];
549
        ctx->D[3] = (tp + ct) - left;
550
    }
551
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
552
}
553
554
static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
555
{
556
    int i, j;
557
    TM2_INIT_POINTERS_2();
558
559
    /* update chroma */
560
    for(j = 0; j < 2; j++){
561
        for(i = 0; i < 2; i++){
562
            U[i] = Uo[i];
563
            V[i] = Vo[i];
564
        }
565
        U += Ustride; V += Vstride;
566
        Uo += oUstride; Vo += oVstride;
567
    }
568
    U -= Ustride * 2;
569
    V -= Vstride * 2;
570
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
571
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
572
573
    /* update deltas */
574
    ctx->D[0] = Yo[3] - last[3];
575
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
576
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
577
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
578
579
    for(j = 0; j < 4; j++){
580
        for(i = 0; i < 4; i++){
581
            Y[i] = Yo[i];
582
            last[i] = Yo[i];
583
        }
584
        Y += Ystride;
585
        Yo += oYstride;
586
    }
587
}
588
589
static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
590
{
591
    int i, j;
592
    int d;
593
    TM2_INIT_POINTERS_2();
594 115329f1 Diego Biurrun
595 64af6168 Mike Melanson
    /* update chroma */
596
    for(j = 0; j < 2; j++){
597
        for(i = 0; i < 2; i++){
598
            U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
599
            V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
600
        }
601
        U += Ustride; V += Vstride;
602
        Uo += oUstride; Vo += oVstride;
603
    }
604
    U -= Ustride * 2;
605
    V -= Vstride * 2;
606
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
607
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
608
609
    /* update deltas */
610
    ctx->D[0] = Yo[3] - last[3];
611
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
612
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
613
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
614
615
    for(j = 0; j < 4; j++){
616
        d = last[3];
617
        for(i = 0; i < 4; i++){
618
            Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
619
            last[i] = Y[i];
620
        }
621
        ctx->D[j] = last[3] - d;
622
        Y += Ystride;
623
        Yo += oYstride;
624
    }
625
}
626
627
static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
628
{
629
    int i, j;
630
    int mx, my;
631
    TM2_INIT_POINTERS_2();
632
633
    mx = GET_TOK(ctx, TM2_MOT);
634
    my = GET_TOK(ctx, TM2_MOT);
635 115329f1 Diego Biurrun
636 64af6168 Mike Melanson
    Yo += my * oYstride + mx;
637
    Uo += (my >> 1) * oUstride + (mx >> 1);
638
    Vo += (my >> 1) * oVstride + (mx >> 1);
639 115329f1 Diego Biurrun
640 64af6168 Mike Melanson
    /* copy chroma */
641
    for(j = 0; j < 2; j++){
642
        for(i = 0; i < 2; i++){
643
            U[i] = Uo[i];
644
            V[i] = Vo[i];
645
        }
646
        U += Ustride; V += Vstride;
647
        Uo += oUstride; Vo += oVstride;
648
    }
649
    U -= Ustride * 2;
650
    V -= Vstride * 2;
651
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
652
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
653
654
    /* copy luma */
655
    for(j = 0; j < 4; j++){
656
        for(i = 0; i < 4; i++){
657
            Y[i] = Yo[i];
658
        }
659
        Y += Ystride;
660
        Yo += oYstride;
661
    }
662
    /* calculate deltas */
663
    Y -= Ystride * 4;
664
    ctx->D[0] = Y[3] - last[3];
665
    ctx->D[1] = Y[3 + Ystride] - Y[3];
666
    ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
667
    ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
668
    for(i = 0; i < 4; i++)
669
        last[i] = Y[i + Ystride * 3];
670
}
671
672
static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
673
{
674
    int i, j;
675
    int bw, bh;
676
    int type;
677
    int keyframe = 1;
678
    uint8_t *Y, *U, *V;
679
    int *src;
680 115329f1 Diego Biurrun
681 64af6168 Mike Melanson
    bw = ctx->avctx->width >> 2;
682
    bh = ctx->avctx->height >> 2;
683
684
    for(i = 0; i < TM2_NUM_STREAMS; i++)
685
        ctx->tok_ptrs[i] = 0;
686 115329f1 Diego Biurrun
687 64af6168 Mike Melanson
    if (ctx->tok_lens[TM2_TYPE]<bw*bh){
688
        av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
689
        return -1;
690
    }
691 115329f1 Diego Biurrun
692 64af6168 Mike Melanson
    memset(ctx->last, 0, 4 * bw * sizeof(int));
693
    memset(ctx->clast, 0, 4 * bw * sizeof(int));
694
695
    for(j = 0; j < bh; j++) {
696
        memset(ctx->D, 0, 4 * sizeof(int));
697
        memset(ctx->CD, 0, 4 * sizeof(int));
698
        for(i = 0; i < bw; i++) {
699
            type = GET_TOK(ctx, TM2_TYPE);
700
            switch(type) {
701
            case TM2_HI_RES:
702
                tm2_hi_res_block(ctx, p, i, j);
703
                break;
704
            case TM2_MED_RES:
705
                tm2_med_res_block(ctx, p, i, j);
706
                break;
707
            case TM2_LOW_RES:
708
                tm2_low_res_block(ctx, p, i, j);
709
                break;
710
            case TM2_NULL_RES:
711
                tm2_null_res_block(ctx, p, i, j);
712
                break;
713
            case TM2_UPDATE:
714
                tm2_update_block(ctx, p, i, j);
715
                keyframe = 0;
716
                break;
717
            case TM2_STILL:
718
                tm2_still_block(ctx, p, i, j);
719
                keyframe = 0;
720
                break;
721
            case TM2_MOTION:
722
                tm2_motion_block(ctx, p, i, j);
723
                keyframe = 0;
724
                break;
725
            default:
726
                av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
727
            }
728
        }
729
    }
730 115329f1 Diego Biurrun
731
    /* copy data from our buffer to AVFrame */
732 64af6168 Mike Melanson
    Y = p->data[0];
733
    src = (ctx->cur?ctx->Y2:ctx->Y1);
734
    for(j = 0; j < ctx->avctx->height; j++){
735
        for(i = 0; i < ctx->avctx->width; i++){
736
            Y[i] = clip_uint8(*src++);
737
        }
738
        Y += p->linesize[0];
739
    }
740
    U = p->data[2];
741
    src = (ctx->cur?ctx->U2:ctx->U1);
742
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
743
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
744
            U[i] = clip_uint8(*src++);
745
        }
746
        U += p->linesize[2];
747
    }
748
    V = p->data[1];
749
    src = (ctx->cur?ctx->V2:ctx->V1);
750
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
751
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
752
            V[i] = clip_uint8(*src++);
753
        }
754
        V += p->linesize[1];
755
    }
756 115329f1 Diego Biurrun
757 64af6168 Mike Melanson
    return keyframe;
758
}
759
760 115329f1 Diego Biurrun
static int decode_frame(AVCodecContext *avctx,
761 64af6168 Mike Melanson
                        void *data, int *data_size,
762
                        uint8_t *buf, int buf_size)
763
{
764
    TM2Context * const l = avctx->priv_data;
765
    AVFrame * const p= (AVFrame*)&l->pic;
766
    int skip, t;
767
768
    p->reference = 1;
769 adeba281 Mike Melanson
    p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
770
    if(avctx->reget_buffer(avctx, p) < 0){
771 64af6168 Mike Melanson
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
772
        return -1;
773
    }
774
775
    l->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, buf_size >> 2);
776
    skip = tm2_read_header(l, buf);
777 115329f1 Diego Biurrun
778 64af6168 Mike Melanson
    if(skip == -1)
779
        return -1;
780 115329f1 Diego Biurrun
781 64af6168 Mike Melanson
    t = tm2_read_stream(l, buf + skip, TM2_C_HI);
782
    if(t == -1)
783
        return -1;
784
    skip += t;
785
    t = tm2_read_stream(l, buf + skip, TM2_C_LO);
786
    if(t == -1)
787
        return -1;
788
    skip += t;
789
    t = tm2_read_stream(l, buf + skip, TM2_L_HI);
790
    if(t == -1)
791
        return -1;
792
    skip += t;
793
    t = tm2_read_stream(l, buf + skip, TM2_L_LO);
794
    if(t == -1)
795
        return -1;
796
    skip += t;
797
    t = tm2_read_stream(l, buf + skip, TM2_UPD);
798
    if(t == -1)
799
        return -1;
800
    skip += t;
801
    t = tm2_read_stream(l, buf + skip, TM2_MOT);
802
    if(t == -1)
803
        return -1;
804
    skip += t;
805
    t = tm2_read_stream(l, buf + skip, TM2_TYPE);
806
    if(t == -1)
807
        return -1;
808
    p->key_frame = tm2_decode_blocks(l, p);
809
    if(p->key_frame)
810
        p->pict_type = FF_I_TYPE;
811
    else
812
        p->pict_type = FF_P_TYPE;
813 115329f1 Diego Biurrun
814 64af6168 Mike Melanson
    l->cur = !l->cur;
815
    *data_size = sizeof(AVFrame);
816
    *(AVFrame*)data = l->pic;
817 115329f1 Diego Biurrun
818 64af6168 Mike Melanson
    return buf_size;
819
}
820
821
static int decode_init(AVCodecContext *avctx){
822
    TM2Context * const l = avctx->priv_data;
823
    int i;
824
825
    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
826
        return -1;
827
    }
828
    if((avctx->width & 3) || (avctx->height & 3)){
829
        av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
830
        return -1;
831
    }
832 115329f1 Diego Biurrun
833 64af6168 Mike Melanson
    l->avctx = avctx;
834
    l->pic.data[0]=NULL;
835
    avctx->has_b_frames = 0;
836
    avctx->pix_fmt = PIX_FMT_YUV420P;
837
838
    dsputil_init(&l->dsp, avctx);
839 115329f1 Diego Biurrun
840 64af6168 Mike Melanson
    l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
841
    l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
842 115329f1 Diego Biurrun
843 64af6168 Mike Melanson
    for(i = 0; i < TM2_NUM_STREAMS; i++) {
844
        l->tokens[i] = NULL;
845
        l->tok_lens[i] = 0;
846
    }
847 115329f1 Diego Biurrun
848 64af6168 Mike Melanson
    l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
849
    l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
850
    l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
851
    l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
852
    l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
853
    l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
854
    l->cur = 0;
855 115329f1 Diego Biurrun
856 64af6168 Mike Melanson
    return 0;
857
}
858
859
static int decode_end(AVCodecContext *avctx){
860
    TM2Context * const l = avctx->priv_data;
861
    int i;
862
863
    if(l->last)
864
        av_free(l->last);
865
    if(l->clast)
866
        av_free(l->clast);
867
    for(i = 0; i < TM2_NUM_STREAMS; i++)
868
        if(l->tokens[i])
869
            av_free(l->tokens[i]);
870
    if(l->Y1){
871
        av_free(l->Y1);
872
        av_free(l->U1);
873
        av_free(l->V1);
874
        av_free(l->Y2);
875
        av_free(l->U2);
876
        av_free(l->V2);
877
    }
878
    return 0;
879
}
880
881
AVCodec truemotion2_decoder = {
882
    "truemotion2",
883
    CODEC_TYPE_VIDEO,
884
    CODEC_ID_TRUEMOTION2,
885
    sizeof(TM2Context),
886
    decode_init,
887
    NULL,
888
    decode_end,
889
    decode_frame,
890
    CODEC_CAP_DR1,
891
};