GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/tiertexseqv.c Lines: 112 131 85.5 %
Date: 2020-08-14 10:39:37 Branches: 54 77 70.1 %

Line Branch Exec Source
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/*
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 * Tiertex Limited SEQ Video Decoder
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 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Tiertex Limited SEQ video decoder
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 */
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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typedef struct SeqVideoContext {
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    AVCodecContext *avctx;
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    AVFrame *frame;
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} SeqVideoContext;
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2508
static const unsigned char *seq_unpack_rle_block(const unsigned char *src,
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                                                 const unsigned char *src_end,
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                                                 unsigned char *dst, int dst_size)
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{
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    int i, len, sz;
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    GetBitContext gb;
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    int code_table[64];
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    /* get the rle codes */
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2508
    init_get_bits(&gb, src, (src_end - src) * 8);
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53386
    for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
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50878
        if (get_bits_left(&gb) < 4)
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            return NULL;
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50878
        code_table[i] = get_sbits(&gb, 4);
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50878
        sz += FFABS(code_table[i]);
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    }
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2508
    src += (get_bits_count(&gb) + 7) / 8;
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    /* do the rle unpacking */
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53386
    for (i = 0; i < 64 && dst_size > 0; i++) {
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50878
        len = code_table[i];
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50878
        if (len < 0) {
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50878
            len = -len;
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50878
            if (src_end - src < 1)
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                return NULL;
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50878
            memset(dst, *src++, FFMIN(len, dst_size));
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        } else {
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            if (src_end - src < len)
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                return NULL;
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            memcpy(dst, src, FFMIN(len, dst_size));
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            src += len;
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        }
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50878
        dst += len;
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50878
        dst_size -= len;
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    }
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2508
    return src;
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}
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6758
static const unsigned char *seq_decode_op1(SeqVideoContext *seq,
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                                           const unsigned char *src,
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                                           const unsigned char *src_end,
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                                           unsigned char *dst)
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{
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    const unsigned char *color_table;
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    int b, i, len, bits;
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    GetBitContext gb;
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    unsigned char block[8 * 8];
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6758
    if (src_end - src < 1)
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        return NULL;
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6758
    len = *src++;
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6758
    if (len & 0x80) {
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2508
        switch (len & 3) {
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1099
        case 1:
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1099
            src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
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9891
            for (b = 0; b < 8; b++) {
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8792
                memcpy(dst, &block[b * 8], 8);
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8792
                dst += seq->frame->linesize[0];
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            }
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1099
            break;
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1409
        case 2:
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1409
            src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
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12681
            for (i = 0; i < 8; i++) {
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101448
                for (b = 0; b < 8; b++)
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90176
                    dst[b * seq->frame->linesize[0]] = block[i * 8 + b];
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11272
                ++dst;
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            }
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1409
            break;
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        }
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2508
    } else {
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4250
        if (len <= 0)
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            return NULL;
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4250
        bits = ff_log2_tab[len - 1] + 1;
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4250
        if (src_end - src < len + 8 * bits)
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            return NULL;
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4250
        color_table = src;
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4250
        src += len;
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4250
        init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
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38250
        for (b = 0; b < 8; b++) {
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306000
            for (i = 0; i < 8; i++)
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272000
                dst[i] = color_table[get_bits(&gb, bits)];
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34000
            dst += seq->frame->linesize[0];
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        }
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    }
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6758
    return src;
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}
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static const unsigned char *seq_decode_op2(SeqVideoContext *seq,
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                                           const unsigned char *src,
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                                           const unsigned char *src_end,
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                                           unsigned char *dst)
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{
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    int i;
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    if (src_end - src < 8 * 8)
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        return NULL;
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1773
    for (i = 0; i < 8; i++) {
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1576
        memcpy(dst, src, 8);
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1576
        src += 8;
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1576
        dst += seq->frame->linesize[0];
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    }
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    return src;
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}
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3101
static const unsigned char *seq_decode_op3(SeqVideoContext *seq,
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                                           const unsigned char *src,
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                                           const unsigned char *src_end,
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                                           unsigned char *dst)
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{
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    int pos, offset;
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    do {
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3101
        if (src_end - src < 2)
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            return NULL;
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3101
        pos = *src++;
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3101
        offset = ((pos >> 3) & 7) * seq->frame->linesize[0] + (pos & 7);
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3101
        dst[offset] = *src++;
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3101
    } while (!(pos & 0x80));
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595
    return src;
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}
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static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
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{
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    const unsigned char *data_end = data + data_size;
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    GetBitContext gb;
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    int flags, i, j, x, y, op;
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    unsigned char c[3];
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    unsigned char *dst;
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    uint32_t *palette;
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    flags = *data++;
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    if (flags & 1) {
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        palette = (uint32_t *)seq->frame->data[1];
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        if (data_end - data < 256 * 3)
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            return AVERROR_INVALIDDATA;
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5397
        for (i = 0; i < 256; i++) {
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21504
            for (j = 0; j < 3; j++, data++)
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16128
                c[j] = (*data << 2) | (*data >> 4);
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5376
            palette[i] = 0xFFU << 24 | AV_RB24(c);
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        }
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        seq->frame->palette_has_changed = 1;
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    }
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    if (flags & 2) {
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21
        if (data_end - data < 128)
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            return AVERROR_INVALIDDATA;
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21
        init_get_bits(&gb, data, 128 * 8); data += 128;
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357
        for (y = 0; y < 128; y += 8)
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11088
            for (x = 0; x < 256; x += 8) {
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10752
                dst = &seq->frame->data[0][y * seq->frame->linesize[0] + x];
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10752
                op = get_bits(&gb, 2);
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10752
                switch (op) {
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6758
                case 1:
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6758
                    data = seq_decode_op1(seq, data, data_end, dst);
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6758
                    break;
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197
                case 2:
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197
                    data = seq_decode_op2(seq, data, data_end, dst);
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197
                    break;
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595
                case 3:
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595
                    data = seq_decode_op3(seq, data, data_end, dst);
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595
                    break;
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                }
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10752
                if (!data)
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                    return AVERROR_INVALIDDATA;
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            }
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    }
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    return 0;
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}
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static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
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{
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2
    SeqVideoContext *seq = avctx->priv_data;
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    int ret;
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    seq->avctx = avctx;
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2
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
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    ret = ff_set_dimensions(avctx, 256, 128);
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2
    if (ret < 0)
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        return ret;
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    seq->frame = av_frame_alloc();
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2
    if (!seq->frame)
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        return AVERROR(ENOMEM);
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    return 0;
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}
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static int seqvideo_decode_frame(AVCodecContext *avctx,
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                                 void *data, int *got_frame,
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                                 AVPacket *avpkt)
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{
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    int ret;
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    SeqVideoContext *seq = avctx->priv_data;
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    if ((ret = ff_reget_buffer(avctx, seq->frame, 0)) < 0)
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        return ret;
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    if (seqvideo_decode(seq, buf, buf_size))
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        return AVERROR_INVALIDDATA;
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    if ((ret = av_frame_ref(data, seq->frame)) < 0)
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        return ret;
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    *got_frame       = 1;
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    return buf_size;
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}
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255
2
static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
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{
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2
    SeqVideoContext *seq = avctx->priv_data;
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2
    av_frame_free(&seq->frame);
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2
    return 0;
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}
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AVCodec ff_tiertexseqvideo_decoder = {
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    .name           = "tiertexseqvideo",
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    .long_name      = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_TIERTEXSEQVIDEO,
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    .priv_data_size = sizeof(SeqVideoContext),
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    .init           = seqvideo_decode_init,
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    .close          = seqvideo_decode_end,
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    .decode         = seqvideo_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};