GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/anm.c Lines: 72 88 81.8 %
Date: 2019-11-22 03:34:36 Branches: 43 58 74.1 %

Line Branch Exec Source
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/*
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 * Deluxe Paint Animation decoder
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 * Copyright (c) 2009 Peter Ross
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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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 * Deluxe Paint Animation decoder
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 */
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct AnmContext {
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    AVFrame *frame;
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    int palette[AVPALETTE_COUNT];
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    GetByteContext gb;
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    int x;  ///< x coordinate position
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} AnmContext;
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2
static av_cold int decode_init(AVCodecContext *avctx)
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{
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2
    AnmContext *s = avctx->priv_data;
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    int i;
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2
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
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2
    s->frame = av_frame_alloc();
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2
    if (!s->frame)
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        return AVERROR(ENOMEM);
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2
    bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size);
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2
    if (bytestream2_get_bytes_left(&s->gb) < 16 * 8 + 4 * 256) {
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        av_frame_free(&s->frame);
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        return AVERROR_INVALIDDATA;
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    }
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2
    bytestream2_skipu(&s->gb, 16 * 8);
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514
    for (i = 0; i < 256; i++)
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512
        s->palette[i] = (0xFFU << 24) | bytestream2_get_le32u(&s->gb);
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2
    return 0;
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}
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/**
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 * Perform decode operation
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 * @param dst     pointer to destination image buffer
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 * @param dst_end pointer to end of destination image buffer
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 * @param gb GetByteContext (optional, see below)
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 * @param pixel Fill color (optional, see below)
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 * @param count Pixel count
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 * @param x Pointer to x-axis counter
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 * @param width Image width
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 * @param linesize Destination image buffer linesize
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 * @return non-zero if destination buffer is exhausted
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 *
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 * a copy operation is achieved when 'gb' is set
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 * a fill operation is achieved when 'gb' is null and pixel is >= 0
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 * a skip operation is achieved when 'gb' is null and pixel is < 0
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 */
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107093
static inline int op(uint8_t **dst, const uint8_t *dst_end,
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                     GetByteContext *gb,
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                     int pixel, int count,
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                     int *x, int width, int linesize)
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{
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107093
    int remaining = width - *x;
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231721
    while(count > 0) {
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124635
        int striplen = FFMIN(count, remaining);
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124635
        if (gb) {
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43244
            if (bytestream2_get_bytes_left(gb) < striplen)
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                goto exhausted;
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43244
            bytestream2_get_bufferu(gb, *dst, striplen);
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81391
        } else if (pixel >= 0)
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29042
            memset(*dst, pixel, striplen);
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124635
        *dst      += striplen;
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124635
        remaining -= striplen;
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124635
        count     -= striplen;
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124635
        if (remaining <= 0) {
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18753
            *dst      += linesize - width;
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18753
            remaining  = width;
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        }
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124635
        if (linesize > 0) {
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124635
            if (*dst >= dst_end) goto exhausted;
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        } else {
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            if (*dst <= dst_end) goto exhausted;
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        }
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    }
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107086
    *x = width - remaining;
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107086
    return 0;
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108
7
exhausted:
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7
    *x = width - remaining;
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7
    return 1;
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}
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123
static int 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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123
    AnmContext *s = avctx->priv_data;
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123
    const int buf_size = avpkt->size;
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    uint8_t *dst, *dst_end;
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    int count, ret;
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122
123
    if (buf_size < 7)
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        return AVERROR_INVALIDDATA;
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125
123
    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
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        return ret;
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123
    dst     = s->frame->data[0];
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123
    dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;
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130
123
    bytestream2_init(&s->gb, avpkt->data, buf_size);
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132
123
    if (bytestream2_get_byte(&s->gb) != 0x42) {
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        avpriv_request_sample(avctx, "Unknown record type");
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        return AVERROR_INVALIDDATA;
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    }
136
123
    if (bytestream2_get_byte(&s->gb)) {
137
        avpriv_request_sample(avctx, "Padding bytes");
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        return AVERROR_PATCHWELCOME;
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    }
140
123
    bytestream2_skip(&s->gb, 2);
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142
123
    s->x = 0;
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    do {
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        /* if statements are ordered by probability */
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#define OP(gb, pixel, count) \
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    op(&dst, dst_end, (gb), (pixel), (count), &s->x, avctx->width, s->frame->linesize[0])
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148
107209
        int type = bytestream2_get_byte(&s->gb);
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107209
        count = type & 0x7F;
150
107209
        type >>= 7;
151
107209
        if (count) {
152

74301
            if (OP(type ? NULL : &s->gb, -1, count)) break;
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32908
        } else if (!type) {
154
            int pixel;
155
28842
            count = bytestream2_get_byte(&s->gb);  /* count==0 gives nop */
156
28842
            pixel = bytestream2_get_byte(&s->gb);
157
28842
            if (OP(NULL, pixel, count)) break;
158
        } else {
159
            int pixel;
160
4066
            type = bytestream2_get_le16(&s->gb);
161
4066
            count = type & 0x3FFF;
162
4066
            type >>= 14;
163
4066
            if (!count) {
164
116
                if (type == 0)
165
116
                    break; // stop
166
                if (type == 2) {
167
                    avpriv_request_sample(avctx, "Unknown opcode");
168
                    return AVERROR_PATCHWELCOME;
169
                }
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                continue;
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            }
172
3950
            pixel = type == 3 ? bytestream2_get_byte(&s->gb) : -1;
173
3950
            if (type == 1) count += 0x4000;
174

3950
            if (OP(type == 2 ? &s->gb : NULL, pixel, count)) break;
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        }
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107086
    } while (bytestream2_get_bytes_left(&s->gb) > 0);
177
178
123
    memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
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180
123
    *got_frame = 1;
181
123
    if ((ret = av_frame_ref(data, s->frame)) < 0)
182
        return ret;
183
184
123
    return buf_size;
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}
186
187
2
static av_cold int decode_end(AVCodecContext *avctx)
188
{
189
2
    AnmContext *s = avctx->priv_data;
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191
2
    av_frame_free(&s->frame);
192
2
    return 0;
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}
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195
AVCodec ff_anm_decoder = {
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    .name           = "anm",
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    .long_name      = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_ANM,
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    .priv_data_size = sizeof(AnmContext),
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    .init           = decode_init,
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    .close          = decode_end,
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    .decode         = decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
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};