GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/eatgq.c Lines: 125 139 89.9 %
Date: 2019-11-22 03:34:36 Branches: 40 53 75.5 %

Line Branch Exec Source
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/*
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 * Electronic Arts TGQ Video Decoder
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 * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
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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 St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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/**
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 * @file
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 * Electronic Arts TGQ Video Decoder
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 * @author Peter Ross <pross@xvid.org>
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 *
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 * Technical details here:
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 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
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 */
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#define BITSTREAM_READER_LE
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#include "aandcttab.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "eaidct.h"
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#include "get_bits.h"
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#include "idctdsp.h"
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#include "internal.h"
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typedef struct TgqContext {
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    AVCodecContext *avctx;
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    int width, height;
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    ScanTable scantable;
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    int qtable[64];
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    DECLARE_ALIGNED(16, int16_t, block)[6][64];
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    GetByteContext gb;
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} TgqContext;
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2
static av_cold int tgq_decode_init(AVCodecContext *avctx)
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{
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2
    TgqContext *s = avctx->priv_data;
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    uint8_t idct_permutation[64];
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2
    s->avctx = avctx;
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2
    ff_init_scantable_permutation(idct_permutation, FF_IDCT_PERM_NONE);
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2
    ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
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2
    avctx->framerate = (AVRational){ 15, 1 };
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2
    avctx->pix_fmt   = AV_PIX_FMT_YUV420P;
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2
    return 0;
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}
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101826
static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
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{
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101826
    uint8_t *perm = s->scantable.permutated;
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    int i, j, value;
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101826
    block[0] = get_sbits(gb, 8) * s->qtable[0];
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101826
    for (i = 1; i < 64;) {
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1463527
        switch (show_bits(gb, 3)) {
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152397
        case 4:
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152397
            block[perm[i++]] = 0;
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370656
        case 0:
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370656
            block[perm[i++]] = 0;
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370656
            skip_bits(gb, 3);
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370656
            break;
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148778
        case 5:
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        case 1:
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148778
            skip_bits(gb, 2);
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148778
            value = get_bits(gb, 6);
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5096670
            for (j = 0; j < value; j++)
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4947892
                block[perm[i++]] = 0;
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148778
            break;
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333783
        case 6:
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333783
            skip_bits(gb, 3);
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333783
            block[perm[i]] = -s->qtable[perm[i]];
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333783
            i++;
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333783
            break;
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339292
        case 2:
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339292
            skip_bits(gb, 3);
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339292
            block[perm[i]] = s->qtable[perm[i]];
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339292
            i++;
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339292
            break;
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271018
        case 7: // 111b
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        case 3: // 011b
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271018
            skip_bits(gb, 2);
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271018
            if (show_bits(gb, 6) == 0x3F) {
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1440
                skip_bits(gb, 6);
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1440
                block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
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            } else {
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269578
                block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
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            }
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271018
            i++;
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271018
            break;
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        }
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1565353
    }
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101826
    block[0] += 128 << 4;
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101826
}
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16971
static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
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                            int mb_x, int mb_y)
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{
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16971
    ptrdiff_t linesize = frame->linesize[0];
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16971
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
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16971
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
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16971
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
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16971
    ff_ea_idct_put_c(dest_y                   , linesize, block[0]);
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16971
    ff_ea_idct_put_c(dest_y                + 8, linesize, block[1]);
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16971
    ff_ea_idct_put_c(dest_y + 8 * linesize    , linesize, block[2]);
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16971
    ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
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16971
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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16971
         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
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16971
         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
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    }
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16971
}
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50508
static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
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                              ptrdiff_t dst_stride, int dc)
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{
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50508
    int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
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    int j;
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454572
    for (j = 0; j < 8; j++)
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404064
        memset(dst + j * dst_stride, level, 8);
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50508
}
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8418
static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
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                                   int mb_x, int mb_y, const int8_t *dc)
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{
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8418
    ptrdiff_t linesize = frame->linesize[0];
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8418
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)             + mb_x * 16;
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8418
    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
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8418
    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
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8418
    tgq_dconly(s, dest_y,                    linesize, dc[0]);
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8418
    tgq_dconly(s, dest_y                + 8, linesize, dc[1]);
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8418
    tgq_dconly(s, dest_y + 8 * linesize,     linesize, dc[2]);
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8418
    tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
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8418
    if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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8418
        tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
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8418
        tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
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    }
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8418
}
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25389
static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
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{
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    int mode;
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    int i;
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    int8_t dc[6];
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157
25389
    mode = bytestream2_get_byte(&s->gb);
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25389
    if (mode > 12) {
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        GetBitContext gb;
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16971
        int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
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16971
        if (ret < 0)
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            return ret;
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118797
        for (i = 0; i < 6; i++)
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101826
            tgq_decode_block(s, s->block[i], &gb);
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16971
        tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
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16971
        bytestream2_skip(&s->gb, mode);
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    } else {
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8418
        if (mode == 3) {
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            memset(dc, bytestream2_get_byte(&s->gb), 4);
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            dc[4] = bytestream2_get_byte(&s->gb);
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            dc[5] = bytestream2_get_byte(&s->gb);
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8418
        } else if (mode == 6) {
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            bytestream2_get_buffer(&s->gb, dc, 6);
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8418
        } else if (mode == 12) {
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58926
            for (i = 0; i < 6; i++) {
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50508
                dc[i] = bytestream2_get_byte(&s->gb);
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50508
                bytestream2_skip(&s->gb, 1);
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            }
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        } else {
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            av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
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            return -1;
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        }
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8418
        tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
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    }
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25389
    return 0;
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}
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189
279
static void tgq_calculate_qtable(TgqContext *s, int quant)
190
{
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    int i, j;
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279
    const int a = (14 * (100 - quant)) / 100 + 1;
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279
    const int b = (11 * (100 - quant)) / 100 + 4;
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2511
    for (j = 0; j < 8; j++)
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20088
        for (i = 0; i < 8; i++)
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17856
            s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
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17856
                                    ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
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279
}
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200
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static int tgq_decode_frame(AVCodecContext *avctx,
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                            void *data, int *got_frame,
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                            AVPacket *avpkt)
203
{
204
279
    const uint8_t *buf = avpkt->data;
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279
    int buf_size       = avpkt->size;
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279
    TgqContext *s      = avctx->priv_data;
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279
    AVFrame *frame     = data;
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    int x, y, ret;
209
    int big_endian;
210
211
279
    if (buf_size < 16) {
212
        av_log(avctx, AV_LOG_WARNING, "truncated header\n");
213
        return AVERROR_INVALIDDATA;
214
    }
215
279
    big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
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279
    bytestream2_init(&s->gb, buf + 8, buf_size - 8);
217
279
    if (big_endian) {
218
279
        s->width  = bytestream2_get_be16u(&s->gb);
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279
        s->height = bytestream2_get_be16u(&s->gb);
220
    } else {
221
        s->width  = bytestream2_get_le16u(&s->gb);
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        s->height = bytestream2_get_le16u(&s->gb);
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    }
224
225
279
    ret = ff_set_dimensions(s->avctx, s->width, s->height);
226
279
    if (ret < 0)
227
        return ret;
228
229
279
    tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
230
279
    bytestream2_skip(&s->gb, 3);
231
232
279
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
233
        return ret;
234
279
    frame->key_frame = 1;
235
279
    frame->pict_type = AV_PICTURE_TYPE_I;
236
237
2232
    for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
238
27342
        for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
239
25389
            if (tgq_decode_mb(s, frame, y, x) < 0)
240
                return AVERROR_INVALIDDATA;
241
242
279
    *got_frame = 1;
243
244
279
    return avpkt->size;
245
}
246
247
AVCodec ff_eatgq_decoder = {
248
    .name           = "eatgq",
249
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
250
    .type           = AVMEDIA_TYPE_VIDEO,
251
    .id             = AV_CODEC_ID_TGQ,
252
    .priv_data_size = sizeof(TgqContext),
253
    .init           = tgq_decode_init,
254
    .decode         = tgq_decode_frame,
255
    .capabilities   = AV_CODEC_CAP_DR1,
256
};