FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/vb.c	Lines:	125	145	86.2 %
Date:	2020-10-23 17:01:47	Branches:	62	84	73.8 %


/*
 * Beam Software VB decoder
 * Copyright (c) 2007 Konstantin Shishkov
 *
 * 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
 * VB Video decoder
 */

#include <stdio.h>
#include <stdlib.h>

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

enum VBFlags {
    VB_HAS_GMC     = 0x01,
    VB_HAS_AUDIO   = 0x04,
    VB_HAS_VIDEO   = 0x08,
    VB_HAS_PALETTE = 0x10,
    VB_HAS_LENGTH  = 0x20
};

typedef struct VBDecContext {
    AVCodecContext *avctx;

    uint8_t *frame, *prev_frame;
    uint32_t pal[AVPALETTE_COUNT];
    GetByteContext stream;
} VBDecContext;

static const uint16_t vb_patterns[64] = {
    0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
    0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
    0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
    0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
    0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
    0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
    0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
    0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
};

static void vb_decode_palette(VBDecContext *c, int data_size)
{
    int start, size, i;

    start = bytestream2_get_byte(&c->stream);
    size  = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
    if (start + size > 255) {
        av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
        return;
    }
    if (size*3+2 > data_size) {
        av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
        return;
    }
    for (i = start; i <= start + size; i++)
        c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream);
}

static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
{
    return buf >= start && buf < end;
}

static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
{
    return buf >= start && (buf + 4) <= end;
}

static int vb_decode_framedata(VBDecContext *c, int offset)
{
    GetByteContext g;
    uint8_t *prev, *cur;
    int blk, blocks, t, blk2;
    int blocktypes = 0;
    int x, y, a, b;
    int pattype, pattern;
    const int width = c->avctx->width;
    uint8_t *pstart = c->prev_frame;
    uint8_t *pend   = c->prev_frame + width*c->avctx->height;

    g = c->stream;

    prev = c->prev_frame + offset;
    cur  = c->frame;

    blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
    blk2   = 0;
    for (blk = 0; blk < blocks; blk++) {
        if (!(blk & 3)) {
            if (bytestream2_get_bytes_left(&g) < 1) {
                av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
                return AVERROR_INVALIDDATA;
            }
            blocktypes = bytestream2_get_byte(&g);
        }
        switch (blocktypes & 0xC0) {
        case 0x00: //skip
            for (y = 0; y < 4; y++)
                if (check_line(prev + y*width, pstart, pend))
                    memcpy(cur + y*width, prev + y*width, 4);
                else
                    memset(cur + y*width, 0, 4);
            break;
        case 0x40:
            t = bytestream2_get_byte(&g);
            if (!t) { //raw block
                if (bytestream2_get_bytes_left(&g) < 16) {
                    av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
                    return AVERROR_INVALIDDATA;
                }
                for (y = 0; y < 4; y++)
                    bytestream2_get_buffer(&g, cur + y * width, 4);
            } else { // motion compensation
                x = ((t & 0xF)^8) - 8;
                y = ((t >> 4) ^8) - 8;
                t = x + y*width;
                for (y = 0; y < 4; y++)
                    if (check_line(prev + t + y*width, pstart, pend))
                        memcpy(cur + y*width, prev + t + y*width, 4);
                    else
                        memset(cur + y*width, 0, 4);
            }
            break;
        case 0x80: // fill
            t = bytestream2_get_byte(&g);
            for (y = 0; y < 4; y++)
                memset(cur + y*width, t, 4);
            break;
        case 0xC0: // pattern fill
            t       = bytestream2_get_byte(&g);
            pattype = t >> 6;
            pattern = vb_patterns[t & 0x3F];
            switch (pattype) {
            case 0:
                a = bytestream2_get_byte(&g);
                b = bytestream2_get_byte(&g);
                for (y = 0; y < 4; y++)
                    for (x = 0; x < 4; x++, pattern >>= 1)
                        cur[x + y*width] = (pattern & 1) ? b : a;
                break;
            case 1:
                pattern = ~pattern;
            case 2:
                a = bytestream2_get_byte(&g);
                for (y = 0; y < 4; y++)
                    for (x = 0; x < 4; x++, pattern >>= 1)
                        if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
                            cur[x + y*width] = prev[x + y*width];
                        else
                            cur[x + y*width] = a;
                break;
            case 3:
                av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
                return AVERROR_INVALIDDATA;
            }
            break;
        }
        blocktypes <<= 2;
        cur  += 4;
        prev += 4;
        blk2++;
        if (blk2 == (width >> 2)) {
            blk2  = 0;
            cur  += width * 3;
            prev += width * 3;
        }
    }
    return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                        AVPacket *avpkt)
{
    VBDecContext * const c = avctx->priv_data;
    AVFrame *frame         = data;
    uint8_t *outptr, *srcptr;
    int i, j, ret;
    int flags;
    uint32_t size;
    int offset = 0;

    if (avpkt->size < 2)
        return AVERROR_INVALIDDATA;

    bytestream2_init(&c->stream, avpkt->data, avpkt->size);

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

    flags = bytestream2_get_le16(&c->stream);

    if (flags & VB_HAS_GMC) {
        i = (int16_t)bytestream2_get_le16(&c->stream);
        j = (int16_t)bytestream2_get_le16(&c->stream);
        if (FFABS(j) > avctx->height) {
            av_log(avctx, AV_LOG_ERROR, "GMV out of range\n");
            return AVERROR_INVALIDDATA;
        }
        offset = i + j * avctx->width;
    }
    if (flags & VB_HAS_VIDEO) {
        size = bytestream2_get_le32(&c->stream);
        if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){
            av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n");
            return -1;
        }
        vb_decode_framedata(c, offset);
        bytestream2_skip(&c->stream, size - 4);
    }
    if (flags & VB_HAS_PALETTE) {
        size = bytestream2_get_le32(&c->stream);
        vb_decode_palette(c, size);
    }

    memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
    frame->palette_has_changed = flags & VB_HAS_PALETTE;

    outptr = frame->data[0];
    srcptr = c->frame;

    for (i = 0; i < avctx->height; i++) {
        memcpy(outptr, srcptr, avctx->width);
        srcptr += avctx->width;
        outptr += frame->linesize[0];
    }

    FFSWAP(uint8_t*, c->frame, c->prev_frame);

    *got_frame = 1;

    /* always report that the buffer was completely consumed */
    return avpkt->size;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    VBDecContext * const c = avctx->priv_data;

    c->avctx       = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    c->frame      = av_mallocz(avctx->width * avctx->height);
    c->prev_frame = av_mallocz(avctx->width * avctx->height);

    if (!c->frame || !c->prev_frame)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    VBDecContext *c = avctx->priv_data;

    av_freep(&c->frame);
    av_freep(&c->prev_frame);

    return 0;
}

AVCodec ff_vb_decoder = {
    .name           = "vb",
    .long_name      = NULL_IF_CONFIG_SMALL("Beam Software VB"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_VB,
    .priv_data_size = sizeof(VBDecContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Beam Software VB decoder
3			* Copyright (c) 2007 Konstantin Shishkov
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			* VB Video decoder
25			*/
26
27			#include <stdio.h>
28			#include <stdlib.h>
29
30			#include "avcodec.h"
31			#include "bytestream.h"
32			#include "internal.h"
33
34			enum VBFlags {
35			VB_HAS_GMC = 0x01,
36			VB_HAS_AUDIO = 0x04,
37			VB_HAS_VIDEO = 0x08,
38			VB_HAS_PALETTE = 0x10,
39			VB_HAS_LENGTH = 0x20
40			};
41
42			typedef struct VBDecContext {
43			AVCodecContext *avctx;
44
45			uint8_t frame, prev_frame;
46			uint32_t pal[AVPALETTE_COUNT];
47			GetByteContext stream;
48			} VBDecContext;
49
50			static const uint16_t vb_patterns[64] = {
51			0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
52			0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
53			0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
54			0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
55			0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
56			0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
57			0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
58			0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
59			};
60
61		1	static void vb_decode_palette(VBDecContext *c, int data_size)
62			{
63			int start, size, i;
64
65		1	start = bytestream2_get_byte(&c->stream);
66		1	size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
67	✗✓	1	if (start + size > 255) {
68			av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
69			return;
70			}
71	✗✓	1	if (size*3+2 > data_size) {
72			av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
73			return;
74			}
75	✓✓	237	for (i = start; i <= start + size; i++)
76		236	c->pal[i] = 0xFFU << 24 \| bytestream2_get_be24(&c->stream);
77			}
78
79		67819	static inline int check_pixel(uint8_t buf, uint8_t start, uint8_t *end)
80			{
81	✓✗✓✗	67819	return buf >= start && buf < end;
82			}
83
84		369468	static inline int check_line(uint8_t buf, uint8_t start, uint8_t *end)
85			{
86	✓✗✓✗	369468	return buf >= start && (buf + 4) <= end;
87			}
88
89		37	static int vb_decode_framedata(VBDecContext *c, int offset)
90			{
91			GetByteContext g;
92			uint8_t prev, cur;
93			int blk, blocks, t, blk2;
94		37	int blocktypes = 0;
95			int x, y, a, b;
96			int pattype, pattern;
97		37	const int width = c->avctx->width;
98		37	uint8_t *pstart = c->prev_frame;
99		37	uint8_t pend = c->prev_frame + widthc->avctx->height;
100
101		37	g = c->stream;
102
103		37	prev = c->prev_frame + offset;
104		37	cur = c->frame;
105
106		37	blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
107		37	blk2 = 0;
108	✓✓	177637	for (blk = 0; blk < blocks; blk++) {
109	✓✓	177600	if (!(blk & 3)) {
110	✗✓	44400	if (bytestream2_get_bytes_left(&g) < 1) {
111			av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
112			return AVERROR_INVALIDDATA;
113			}
114		44400	blocktypes = bytestream2_get_byte(&g);
115			}
116	✓✓✓✓ ✗	177600	switch (blocktypes & 0xC0) {
117		14413	case 0x00: //skip
118	✓✓	72065	for (y = 0; y < 4; y++)
119	✓✗	57652	if (check_line(prev + y*width, pstart, pend))
120		57652	memcpy(cur + ywidth, prev + ywidth, 4);
121			else
122			memset(cur + y*width, 0, 4);
123		14413	break;
124		93230	case 0x40:
125		93230	t = bytestream2_get_byte(&g);
126	✓✓	93230	if (!t) { //raw block
127	✗✓	15276	if (bytestream2_get_bytes_left(&g) < 16) {
128			av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
129			return AVERROR_INVALIDDATA;
130			}
131	✓✓	76380	for (y = 0; y < 4; y++)
132		61104	bytestream2_get_buffer(&g, cur + y * width, 4);
133			} else { // motion compensation
134		77954	x = ((t & 0xF)^8) - 8;
135		77954	y = ((t >> 4) ^8) - 8;
136		77954	t = x + y*width;
137	✓✓	389770	for (y = 0; y < 4; y++)
138	✓✗	311816	if (check_line(prev + t + y*width, pstart, pend))
139		311816	memcpy(cur + ywidth, prev + t + ywidth, 4);
140			else
141			memset(cur + y*width, 0, 4);
142			}
143		93230	break;
144		11328	case 0x80: // fill
145		11328	t = bytestream2_get_byte(&g);
146	✓✓	56640	for (y = 0; y < 4; y++)
147		45312	memset(cur + y*width, t, 4);
148		11328	break;
149		58629	case 0xC0: // pattern fill
150		58629	t = bytestream2_get_byte(&g);
151		58629	pattype = t >> 6;
152	✓✓✓✗ ✗	58629	pattern = vb_patterns[t & 0x3F];
153			switch (pattype) {
154		51372	case 0:
155		51372	a = bytestream2_get_byte(&g);
156		51372	b = bytestream2_get_byte(&g);
157	✓✓	256860	for (y = 0; y < 4; y++)
158	✓✓	1027440	for (x = 0; x < 4; x++, pattern >>= 1)
159	✓✓	821952	cur[x + y*width] = (pattern & 1) ? b : a;
160		51372	break;
161		4746	case 1:
162		4746	pattern = ~pattern;
163		7257	case 2:
164		7257	a = bytestream2_get_byte(&g);
165	✓✓	36285	for (y = 0; y < 4; y++)
166	✓✓	145140	for (x = 0; x < 4; x++, pattern >>= 1)
167	✓✓✓✗	116112	if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
168		67819	cur[x + ywidth] = prev[x + ywidth];
169			else
170		48293	cur[x + y*width] = a;
171		7257	break;
172			case 3:
173			av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
174			return AVERROR_INVALIDDATA;
175			}
176		58629	break;
177			}
178		177600	blocktypes <<= 2;
179		177600	cur += 4;
180		177600	prev += 4;
181		177600	blk2++;
182	✓✓	177600	if (blk2 == (width >> 2)) {
183		2220	blk2 = 0;
184		2220	cur += width * 3;
185		2220	prev += width * 3;
186			}
187			}
188		37	return 0;
189			}
190
191		37	static int decode_frame(AVCodecContext avctx, void data, int *got_frame,
192			AVPacket *avpkt)
193			{
194		37	VBDecContext * const c = avctx->priv_data;
195		37	AVFrame *frame = data;
196			uint8_t outptr, srcptr;
197			int i, j, ret;
198			int flags;
199			uint32_t size;
200		37	int offset = 0;
201
202	✗✓	37	if (avpkt->size < 2)
203			return AVERROR_INVALIDDATA;
204
205		37	bytestream2_init(&c->stream, avpkt->data, avpkt->size);
206
207	✗✓	37	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
208			return ret;
209
210		37	flags = bytestream2_get_le16(&c->stream);
211
212	✓✓	37	if (flags & VB_HAS_GMC) {
213		8	i = (int16_t)bytestream2_get_le16(&c->stream);
214		8	j = (int16_t)bytestream2_get_le16(&c->stream);
215	✗✓	8	if (FFABS(j) > avctx->height) {
216			av_log(avctx, AV_LOG_ERROR, "GMV out of range\n");
217			return AVERROR_INVALIDDATA;
218			}
219		8	offset = i + j * avctx->width;
220			}
221	✓✗	37	if (flags & VB_HAS_VIDEO) {
222		37	size = bytestream2_get_le32(&c->stream);
223	✓✗✗✓	37	if(size > bytestream2_get_bytes_left(&c->stream)+4 \|\| size<4){
224			av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n");
225			return -1;
226			}
227		37	vb_decode_framedata(c, offset);
228		37	bytestream2_skip(&c->stream, size - 4);
229			}
230	✓✓	37	if (flags & VB_HAS_PALETTE) {
231		1	size = bytestream2_get_le32(&c->stream);
232		1	vb_decode_palette(c, size);
233			}
234
235		37	memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
236		37	frame->palette_has_changed = flags & VB_HAS_PALETTE;
237
238		37	outptr = frame->data[0];
239		37	srcptr = c->frame;
240
241	✓✓	8917	for (i = 0; i < avctx->height; i++) {
242		8880	memcpy(outptr, srcptr, avctx->width);
243		8880	srcptr += avctx->width;
244		8880	outptr += frame->linesize[0];
245			}
246
247		37	FFSWAP(uint8_t*, c->frame, c->prev_frame);
248
249		37	*got_frame = 1;
250
251			/* always report that the buffer was completely consumed */
252		37	return avpkt->size;
253			}
254
255		3	static av_cold int decode_init(AVCodecContext *avctx)
256			{
257		3	VBDecContext * const c = avctx->priv_data;
258
259		3	c->avctx = avctx;
260		3	avctx->pix_fmt = AV_PIX_FMT_PAL8;
261
262		3	c->frame = av_mallocz(avctx->width * avctx->height);
263		3	c->prev_frame = av_mallocz(avctx->width * avctx->height);
264
265	✓✗✗✓	3	if (!c->frame \|\| !c->prev_frame)
266			return AVERROR(ENOMEM);
267
268		3	return 0;
269			}
270
271		3	static av_cold int decode_end(AVCodecContext *avctx)
272			{
273		3	VBDecContext *c = avctx->priv_data;
274
275		3	av_freep(&c->frame);
276		3	av_freep(&c->prev_frame);
277
278		3	return 0;
279			}
280
281			AVCodec ff_vb_decoder = {
282			.name = "vb",
283			.long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"),
284			.type = AVMEDIA_TYPE_VIDEO,
285			.id = AV_CODEC_ID_VB,
286			.priv_data_size = sizeof(VBDecContext),
287			.init = decode_init,
288			.close = decode_end,
289			.decode = decode_frame,
290			.capabilities = AV_CODEC_CAP_DR1,
291			.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
292			};