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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/bfi.c	Lines:	84	95	88.4 %
Date:	2020-01-27 20:17:04	Branches:	34	43	79.1 %


/*
 * Brute Force & Ignorance (BFI) video decoder
 * Copyright (c) 2008 Sisir Koppaka
 *
 * 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
 * @brief Brute Force & Ignorance (.bfi) video decoder
 * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
 * @see http://wiki.multimedia.cx/index.php?title=BFI
 */

#include "libavutil/common.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

typedef struct BFIContext {
    AVCodecContext *avctx;
    uint8_t *dst;
    uint32_t pal[256];
} BFIContext;

static av_cold int bfi_decode_init(AVCodecContext *avctx)
{
    BFIContext *bfi = avctx->priv_data;
    avctx->pix_fmt  = AV_PIX_FMT_PAL8;
    bfi->dst        = av_mallocz(avctx->width * avctx->height);
    if (!bfi->dst)
        return AVERROR(ENOMEM);
    return 0;
}

static int bfi_decode_frame(AVCodecContext *avctx, void *data,
                            int *got_frame, AVPacket *avpkt)
{
    AVFrame *frame = data;
    GetByteContext g;
    int buf_size    = avpkt->size;
    BFIContext *bfi = avctx->priv_data;
    uint8_t *dst    = bfi->dst;
    uint8_t *src, *dst_offset, colour1, colour2;
    uint8_t *frame_end = bfi->dst + avctx->width * avctx->height;
    uint32_t *pal;
    int i, j, ret, height = avctx->height;

    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;

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

    /* Set frame parameters and palette, if necessary */
    if (!avctx->frame_number) {
        frame->pict_type = AV_PICTURE_TYPE_I;
        frame->key_frame = 1;
        /* Setting the palette */
        if (avctx->extradata_size > 768) {
            av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n");
            return AVERROR_INVALIDDATA;
        }
        pal = (uint32_t *)frame->data[1];
        for (i = 0; i < avctx->extradata_size / 3; i++) {
            int shift = 16;
            *pal = 0xFFU << 24;
            for (j = 0; j < 3; j++, shift -= 8)
                *pal += ((avctx->extradata[i * 3 + j] << 2) |
                         (avctx->extradata[i * 3 + j] >> 4)) << shift;
            pal++;
        }
        memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
        frame->palette_has_changed = 1;
    } else {
        frame->pict_type = AV_PICTURE_TYPE_P;
        frame->key_frame = 0;
        frame->palette_has_changed = 0;
        memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
    }

    bytestream2_skip(&g, 4); // Unpacked size, not required.

    while (dst != frame_end) {
        static const uint8_t lentab[4] = { 0, 2, 0, 1 };
        unsigned int byte   = bytestream2_get_byte(&g), av_uninit(offset);
        unsigned int code   = byte >> 6;
        unsigned int length = byte & ~0xC0;

        if (!bytestream2_get_bytes_left(&g)) {
            av_log(avctx, AV_LOG_ERROR,
                   "Input resolution larger than actual frame.\n");
            return AVERROR_INVALIDDATA;
        }

        /* Get length and offset (if required) */
        if (length == 0) {
            if (code == 1) {
                length = bytestream2_get_byte(&g);
                offset = bytestream2_get_le16(&g);
            } else {
                length = bytestream2_get_le16(&g);
                if (code == 2 && length == 0)
                    break;
            }
        } else {
            if (code == 1)
                offset = bytestream2_get_byte(&g);
        }

        /* Do boundary check */
        if (dst + (length << lentab[code]) > frame_end)
            break;

        switch (code) {
        case 0:                // normal chain
            if (length >= bytestream2_get_bytes_left(&g)) {
                av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
                return AVERROR_INVALIDDATA;
            }
            bytestream2_get_buffer(&g, dst, length);
            dst += length;
            break;
        case 1:                // back chain
            dst_offset = dst - offset;
            length    *= 4;     // Convert dwords to bytes.
            if (dst_offset < bfi->dst)
                break;
            while (length--)
                *dst++ = *dst_offset++;
            break;
        case 2:                // skip chain
            dst += length;
            break;
        case 3:                // fill chain
            colour1 = bytestream2_get_byte(&g);
            colour2 = bytestream2_get_byte(&g);
            while (length--) {
                *dst++ = colour1;
                *dst++ = colour2;
            }
            break;
        }
    }

    src = bfi->dst;
    dst = frame->data[0];
    while (height--) {
        memcpy(dst, src, avctx->width);
        src += avctx->width;
        dst += frame->linesize[0];
    }
    *got_frame = 1;

    return buf_size;
}

static av_cold int bfi_decode_close(AVCodecContext *avctx)
{
    BFIContext *bfi = avctx->priv_data;
    av_freep(&bfi->dst);
    return 0;
}

AVCodec ff_bfi_decoder = {
    .name           = "bfi",
    .long_name      = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_BFI,
    .priv_data_size = sizeof(BFIContext),
    .init           = bfi_decode_init,
    .close          = bfi_decode_close,
    .decode         = bfi_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* Brute Force & Ignorance (BFI) video decoder
3			* Copyright (c) 2008 Sisir Koppaka
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			* @brief Brute Force & Ignorance (.bfi) video decoder
25			* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
26			* @see http://wiki.multimedia.cx/index.php?title=BFI
27			*/
28
29			#include "libavutil/common.h"
30			#include "avcodec.h"
31			#include "bytestream.h"
32			#include "internal.h"
33
34			typedef struct BFIContext {
35			AVCodecContext *avctx;
36			uint8_t *dst;
37			uint32_t pal[256];
38			} BFIContext;
39
40		2	static av_cold int bfi_decode_init(AVCodecContext *avctx)
41			{
42		2	BFIContext *bfi = avctx->priv_data;
43		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
44		2	bfi->dst = av_mallocz(avctx->width * avctx->height);
45	✗✓	2	if (!bfi->dst)
46			return AVERROR(ENOMEM);
47		2	return 0;
48			}
49
50		57	static int bfi_decode_frame(AVCodecContext avctx, void data,
51			int got_frame, AVPacket avpkt)
52			{
53		57	AVFrame *frame = data;
54			GetByteContext g;
55		57	int buf_size = avpkt->size;
56		57	BFIContext *bfi = avctx->priv_data;
57		57	uint8_t *dst = bfi->dst;
58			uint8_t src, dst_offset, colour1, colour2;
59		57	uint8_t frame_end = bfi->dst + avctx->width avctx->height;
60			uint32_t *pal;
61		57	int i, j, ret, height = avctx->height;
62
63	✗✓	57	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
64			return ret;
65
66		57	bytestream2_init(&g, avpkt->data, buf_size);
67
68			/* Set frame parameters and palette, if necessary */
69	✓✓	57	if (!avctx->frame_number) {
70		1	frame->pict_type = AV_PICTURE_TYPE_I;
71		1	frame->key_frame = 1;
72			/* Setting the palette */
73	✗✓	1	if (avctx->extradata_size > 768) {
74			av_log(avctx, AV_LOG_ERROR, "Palette is too large.\n");
75			return AVERROR_INVALIDDATA;
76			}
77		1	pal = (uint32_t *)frame->data[1];
78	✓✓	257	for (i = 0; i < avctx->extradata_size / 3; i++) {
79		256	int shift = 16;
80		256	*pal = 0xFFU << 24;
81	✓✓	1024	for (j = 0; j < 3; j++, shift -= 8)
82		768	pal += ((avctx->extradata[i 3 + j] << 2) \|
83		768	(avctx->extradata[i * 3 + j] >> 4)) << shift;
84		256	pal++;
85			}
86		1	memcpy(bfi->pal, frame->data[1], sizeof(bfi->pal));
87		1	frame->palette_has_changed = 1;
88			} else {
89		56	frame->pict_type = AV_PICTURE_TYPE_P;
90		56	frame->key_frame = 0;
91		56	frame->palette_has_changed = 0;
92		56	memcpy(frame->data[1], bfi->pal, sizeof(bfi->pal));
93			}
94
95		57	bytestream2_skip(&g, 4); // Unpacked size, not required.
96
97		57	while (dst != frame_end) {
98			static const uint8_t lentab[4] = { 0, 2, 0, 1 };
99		319585	unsigned int byte = bytestream2_get_byte(&g), av_uninit(offset);
100		319585	unsigned int code = byte >> 6;
101		319585	unsigned int length = byte & ~0xC0;
102
103	✗✓	319585	if (!bytestream2_get_bytes_left(&g)) {
104			av_log(avctx, AV_LOG_ERROR,
105			"Input resolution larger than actual frame.\n");
106			return AVERROR_INVALIDDATA;
107			}
108
109			/* Get length and offset (if required) */
110	✓✓	319585	if (length == 0) {
111	✓✓	46045	if (code == 1) {
112		44996	length = bytestream2_get_byte(&g);
113		44996	offset = bytestream2_get_le16(&g);
114			} else {
115		1049	length = bytestream2_get_le16(&g);
116	✓✓✗✓	1049	if (code == 2 && length == 0)
117			break;
118			}
119			} else {
120	✓✓	273540	if (code == 1)
121		7005	offset = bytestream2_get_byte(&g);
122			}
123
124			/* Do boundary check */
125	✗✓	319585	if (dst + (length << lentab[code]) > frame_end)
126			break;
127
128	✓✓✓✓ ✗	319585	switch (code) {
129		124968	case 0: // normal chain
130	✗✓	124968	if (length >= bytestream2_get_bytes_left(&g)) {
131			av_log(avctx, AV_LOG_ERROR, "Frame larger than buffer.\n");
132			return AVERROR_INVALIDDATA;
133			}
134		124968	bytestream2_get_buffer(&g, dst, length);
135		124968	dst += length;
136		124968	break;
137		52001	case 1: // back chain
138		52001	dst_offset = dst - offset;
139		52001	length *= 4; // Convert dwords to bytes.
140	✗✓	52001	if (dst_offset < bfi->dst)
141			break;
142	✓✓	871277	while (length--)
143		819276	dst++ = dst_offset++;
144		52001	break;
145		133856	case 2: // skip chain
146		133856	dst += length;
147		133856	break;
148		8760	case 3: // fill chain
149		8760	colour1 = bytestream2_get_byte(&g);
150		8760	colour2 = bytestream2_get_byte(&g);
151	✓✓	44349	while (length--) {
152		35589	*dst++ = colour1;
153		35589	*dst++ = colour2;
154			}
155		8760	break;
156			}
157	✓✓	319642	}
158
159		57	src = bfi->dst;
160		57	dst = frame->data[0];
161	✓✓	8037	while (height--) {
162		7980	memcpy(dst, src, avctx->width);
163		7980	src += avctx->width;
164		7980	dst += frame->linesize[0];
165			}
166		57	*got_frame = 1;
167
168		57	return buf_size;
169			}
170
171		2	static av_cold int bfi_decode_close(AVCodecContext *avctx)
172			{
173		2	BFIContext *bfi = avctx->priv_data;
174		2	av_freep(&bfi->dst);
175		2	return 0;
176			}
177
178			AVCodec ff_bfi_decoder = {
179			.name = "bfi",
180			.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
181			.type = AVMEDIA_TYPE_VIDEO,
182			.id = AV_CODEC_ID_BFI,
183			.priv_data_size = sizeof(BFIContext),
184			.init = bfi_decode_init,
185			.close = bfi_decode_close,
186			.decode = bfi_decode_frame,
187			.capabilities = AV_CODEC_CAP_DR1,
188			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
189			};