FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/anm.c	Lines:	72	87	82.8 %
Date:	2021-04-20 15:25:36	Branches:	43	58	74.1 %


/*
 * Deluxe Paint Animation decoder
 * Copyright (c) 2009 Peter Ross
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Deluxe Paint Animation decoder
 */

#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

typedef struct AnmContext {
    AVFrame *frame;
    int palette[AVPALETTE_COUNT];
} AnmContext;

static av_cold int decode_init(AVCodecContext *avctx)
{
    AnmContext *s = avctx->priv_data;
    GetByteContext gb;
    int i;

    if (avctx->extradata_size < 16 * 8 + 4 * 256)
        return AVERROR_INVALIDDATA;

    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    bytestream2_init(&gb, avctx->extradata, avctx->extradata_size);
    bytestream2_skipu(&gb, 16 * 8);
    for (i = 0; i < 256; i++)
        s->palette[i] = (0xFFU << 24) | bytestream2_get_le32u(&gb);

    return 0;
}

/**
 * Perform decode operation
 * @param dst     pointer to destination image buffer
 * @param dst_end pointer to end of destination image buffer
 * @param gb GetByteContext (optional, see below)
 * @param pixel Fill color (optional, see below)
 * @param count Pixel count
 * @param x Pointer to x-axis counter
 * @param width Image width
 * @param linesize Destination image buffer linesize
 * @return non-zero if destination buffer is exhausted
 *
 * a copy operation is achieved when 'gb' is set
 * a fill operation is achieved when 'gb' is null and pixel is >= 0
 * a skip operation is achieved when 'gb' is null and pixel is < 0
 */
static inline int op(uint8_t **dst, const uint8_t *dst_end,
                     GetByteContext *gb,
                     int pixel, int count,
                     int *x, int width, int linesize)
{
    int remaining = width - *x;
    while(count > 0) {
        int striplen = FFMIN(count, remaining);
        if (gb) {
            if (bytestream2_get_bytes_left(gb) < striplen)
                goto exhausted;
            bytestream2_get_bufferu(gb, *dst, striplen);
        } else if (pixel >= 0)
            memset(*dst, pixel, striplen);
        *dst      += striplen;
        remaining -= striplen;
        count     -= striplen;
        if (remaining <= 0) {
            *dst      += linesize - width;
            remaining  = width;
        }
        if (linesize > 0) {
            if (*dst >= dst_end) goto exhausted;
        } else {
            if (*dst <= dst_end) goto exhausted;
        }
    }
    *x = width - remaining;
    return 0;

exhausted:
    *x = width - remaining;
    return 1;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame,
                        AVPacket *avpkt)
{
    AnmContext *s = avctx->priv_data;
    const int buf_size = avpkt->size;
    uint8_t *dst, *dst_end;
    GetByteContext gb;
    int count, ret, x = 0;

    if (buf_size < 7)
        return AVERROR_INVALIDDATA;

    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
        return ret;
    dst     = s->frame->data[0];
    dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;

    bytestream2_init(&gb, avpkt->data, buf_size);

    if (bytestream2_get_byte(&gb) != 0x42) {
        avpriv_request_sample(avctx, "Unknown record type");
        return AVERROR_INVALIDDATA;
    }
    if (bytestream2_get_byte(&gb)) {
        avpriv_request_sample(avctx, "Padding bytes");
        return AVERROR_PATCHWELCOME;
    }
    bytestream2_skip(&gb, 2);

    do {
        /* if statements are ordered by probability */
#define OP(gb, pixel, count) \
    op(&dst, dst_end, (gb), (pixel), (count), &x, avctx->width, s->frame->linesize[0])

        int type = bytestream2_get_byte(&gb);
        count = type & 0x7F;
        type >>= 7;
        if (count) {
            if (OP(type ? NULL : &gb, -1, count)) break;
        } else if (!type) {
            int pixel;
            count = bytestream2_get_byte(&gb);  /* count==0 gives nop */
            pixel = bytestream2_get_byte(&gb);
            if (OP(NULL, pixel, count)) break;
        } else {
            int pixel;
            type = bytestream2_get_le16(&gb);
            count = type & 0x3FFF;
            type >>= 14;
            if (!count) {
                if (type == 0)
                    break; // stop
                if (type == 2) {
                    avpriv_request_sample(avctx, "Unknown opcode");
                    return AVERROR_PATCHWELCOME;
                }
                continue;
            }
            pixel = type == 3 ? bytestream2_get_byte(&gb) : -1;
            if (type == 1) count += 0x4000;
            if (OP(type == 2 ? &gb : NULL, pixel, count)) break;
        }
    } while (bytestream2_get_bytes_left(&gb) > 0);

    memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);

    *got_frame = 1;
    if ((ret = av_frame_ref(data, s->frame)) < 0)
        return ret;

    return buf_size;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    AnmContext *s = avctx->priv_data;

    av_frame_free(&s->frame);
    return 0;
}

AVCodec ff_anm_decoder = {
    .name           = "anm",
    .long_name      = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_ANM,
    .priv_data_size = sizeof(AnmContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Deluxe Paint Animation decoder
3			* Copyright (c) 2009 Peter Ross
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* Deluxe Paint Animation decoder
25			*/
26
27			#include "avcodec.h"
28			#include "bytestream.h"
29			#include "internal.h"
30
31			typedef struct AnmContext {
32			AVFrame *frame;
33			int palette[AVPALETTE_COUNT];
34			} AnmContext;
35
36		2	static av_cold int decode_init(AVCodecContext *avctx)
37			{
38		2	AnmContext *s = avctx->priv_data;
39			GetByteContext gb;
40			int i;
41
42	✗✓	2	if (avctx->extradata_size < 16 * 8 + 4 * 256)
43			return AVERROR_INVALIDDATA;
44
45		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
46
47		2	s->frame = av_frame_alloc();
48	✗✓	2	if (!s->frame)
49			return AVERROR(ENOMEM);
50
51		2	bytestream2_init(&gb, avctx->extradata, avctx->extradata_size);
52		2	bytestream2_skipu(&gb, 16 * 8);
53	✓✓	514	for (i = 0; i < 256; i++)
54		512	s->palette[i] = (0xFFU << 24) \| bytestream2_get_le32u(&gb);
55
56		2	return 0;
57			}
58
59			/**
60			* Perform decode operation
61			* @param dst pointer to destination image buffer
62			* @param dst_end pointer to end of destination image buffer
63			* @param gb GetByteContext (optional, see below)
64			* @param pixel Fill color (optional, see below)
65			* @param count Pixel count
66			* @param x Pointer to x-axis counter
67			* @param width Image width
68			* @param linesize Destination image buffer linesize
69			* @return non-zero if destination buffer is exhausted
70			*
71			* a copy operation is achieved when 'gb' is set
72			* a fill operation is achieved when 'gb' is null and pixel is >= 0
73			* a skip operation is achieved when 'gb' is null and pixel is < 0
74			*/
75		107093	static inline int op(uint8_t *dst, const uint8_t dst_end,
76			GetByteContext *gb,
77			int pixel, int count,
78			int *x, int width, int linesize)
79			{
80		107093	int remaining = width - *x;
81	✓✓	231721	while(count > 0) {
82		124635	int striplen = FFMIN(count, remaining);
83	✓✓	124635	if (gb) {
84	✗✓	43244	if (bytestream2_get_bytes_left(gb) < striplen)
85			goto exhausted;
86		43244	bytestream2_get_bufferu(gb, *dst, striplen);
87	✓✓	81391	} else if (pixel >= 0)
88		29042	memset(*dst, pixel, striplen);
89		124635	*dst += striplen;
90		124635	remaining -= striplen;
91		124635	count -= striplen;
92	✓✓	124635	if (remaining <= 0) {
93		18753	*dst += linesize - width;
94		18753	remaining = width;
95			}
96	✓✗	124635	if (linesize > 0) {
97	✓✓	124635	if (*dst >= dst_end) goto exhausted;
98			} else {
99			if (*dst <= dst_end) goto exhausted;
100			}
101			}
102		107086	*x = width - remaining;
103		107086	return 0;
104
105		7	exhausted:
106		7	*x = width - remaining;
107		7	return 1;
108			}
109
110		123	static int decode_frame(AVCodecContext *avctx,
111			void data, int got_frame,
112			AVPacket *avpkt)
113			{
114		123	AnmContext *s = avctx->priv_data;
115		123	const int buf_size = avpkt->size;
116			uint8_t dst, dst_end;
117			GetByteContext gb;
118		123	int count, ret, x = 0;
119
120	✗✓	123	if (buf_size < 7)
121			return AVERROR_INVALIDDATA;
122
123	✗✓	123	if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
124			return ret;
125		123	dst = s->frame->data[0];
126		123	dst_end = s->frame->data[0] + s->frame->linesize[0]*avctx->height;
127
128		123	bytestream2_init(&gb, avpkt->data, buf_size);
129
130	✗✓	123	if (bytestream2_get_byte(&gb) != 0x42) {
131			avpriv_request_sample(avctx, "Unknown record type");
132			return AVERROR_INVALIDDATA;
133			}
134	✗✓	123	if (bytestream2_get_byte(&gb)) {
135			avpriv_request_sample(avctx, "Padding bytes");
136			return AVERROR_PATCHWELCOME;
137			}
138		123	bytestream2_skip(&gb, 2);
139
140			do {
141			/* if statements are ordered by probability */
142			#define OP(gb, pixel, count) \
143			op(&dst, dst_end, (gb), (pixel), (count), &x, avctx->width, s->frame->linesize[0])
144
145		107209	int type = bytestream2_get_byte(&gb);
146		107209	count = type & 0x7F;
147		107209	type >>= 7;
148	✓✓	107209	if (count) {
149	✓✓✓✓	74301	if (OP(type ? NULL : &gb, -1, count)) break;
150	✓✓	32908	} else if (!type) {
151			int pixel;
152		28842	count = bytestream2_get_byte(&gb); /* count==0 gives nop */
153		28842	pixel = bytestream2_get_byte(&gb);
154	✓✓	28842	if (OP(NULL, pixel, count)) break;
155			} else {
156			int pixel;
157		4066	type = bytestream2_get_le16(&gb);
158		4066	count = type & 0x3FFF;
159		4066	type >>= 14;
160	✓✓	4066	if (!count) {
161	✓✗	116	if (type == 0)
162		116	break; // stop
163			if (type == 2) {
164			avpriv_request_sample(avctx, "Unknown opcode");
165			return AVERROR_PATCHWELCOME;
166			}
167			continue;
168			}
169	✓✓	3950	pixel = type == 3 ? bytestream2_get_byte(&gb) : -1;
170	✓✓	3950	if (type == 1) count += 0x4000;
171	✓✓✓✓	3950	if (OP(type == 2 ? &gb : NULL, pixel, count)) break;
172			}
173	✓✗	107086	} while (bytestream2_get_bytes_left(&gb) > 0);
174
175		123	memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
176
177		123	*got_frame = 1;
178	✗✓	123	if ((ret = av_frame_ref(data, s->frame)) < 0)
179			return ret;
180
181		123	return buf_size;
182			}
183
184		2	static av_cold int decode_end(AVCodecContext *avctx)
185			{
186		2	AnmContext *s = avctx->priv_data;
187
188		2	av_frame_free(&s->frame);
189		2	return 0;
190			}
191
192			AVCodec ff_anm_decoder = {
193			.name = "anm",
194			.long_name = NULL_IF_CONFIG_SMALL("Deluxe Paint Animation"),
195			.type = AVMEDIA_TYPE_VIDEO,
196			.id = AV_CODEC_ID_ANM,
197			.priv_data_size = sizeof(AnmContext),
198			.init = decode_init,
199			.close = decode_end,
200			.decode = decode_frame,
201			.capabilities = AV_CODEC_CAP_DR1,
202			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
203			};