FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/tiertexseqv.c	Lines:	112	131	85.5 %
Date:	2021-04-22 14:24:15	Branches:	54	77	70.1 %


/*
 * Tiertex Limited SEQ Video Decoder
 * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
 *
 * 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
 * Tiertex Limited SEQ video decoder
 */

#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"


typedef struct SeqVideoContext {
    AVCodecContext *avctx;
    AVFrame *frame;
} SeqVideoContext;


static const unsigned char *seq_unpack_rle_block(const unsigned char *src,
                                                 const unsigned char *src_end,
                                                 unsigned char *dst, int dst_size)
{
    int i, len, sz;
    GetBitContext gb;
    int code_table[64];

    /* get the rle codes */
    init_get_bits(&gb, src, (src_end - src) * 8);
    for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
        if (get_bits_left(&gb) < 4)
            return NULL;
        code_table[i] = get_sbits(&gb, 4);
        sz += FFABS(code_table[i]);
    }
    src += (get_bits_count(&gb) + 7) / 8;

    /* do the rle unpacking */
    for (i = 0; i < 64 && dst_size > 0; i++) {
        len = code_table[i];
        if (len < 0) {
            len = -len;
            if (src_end - src < 1)
                return NULL;
            memset(dst, *src++, FFMIN(len, dst_size));
        } else {
            if (src_end - src < len)
                return NULL;
            memcpy(dst, src, FFMIN(len, dst_size));
            src += len;
        }
        dst += len;
        dst_size -= len;
    }
    return src;
}

static const unsigned char *seq_decode_op1(SeqVideoContext *seq,
                                           const unsigned char *src,
                                           const unsigned char *src_end,
                                           unsigned char *dst)
{
    const unsigned char *color_table;
    int b, i, len, bits;
    GetBitContext gb;
    unsigned char block[8 * 8];

    if (src_end - src < 1)
        return NULL;
    len = *src++;
    if (len & 0x80) {
        switch (len & 3) {
        case 1:
            src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
            for (b = 0; b < 8; b++) {
                memcpy(dst, &block[b * 8], 8);
                dst += seq->frame->linesize[0];
            }
            break;
        case 2:
            src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
            for (i = 0; i < 8; i++) {
                for (b = 0; b < 8; b++)
                    dst[b * seq->frame->linesize[0]] = block[i * 8 + b];
                ++dst;
            }
            break;
        }
    } else {
        if (len <= 0)
            return NULL;
        bits = ff_log2_tab[len - 1] + 1;
        if (src_end - src < len + 8 * bits)
            return NULL;
        color_table = src;
        src += len;
        init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
        for (b = 0; b < 8; b++) {
            for (i = 0; i < 8; i++)
                dst[i] = color_table[get_bits(&gb, bits)];
            dst += seq->frame->linesize[0];
        }
    }

    return src;
}

static const unsigned char *seq_decode_op2(SeqVideoContext *seq,
                                           const unsigned char *src,
                                           const unsigned char *src_end,
                                           unsigned char *dst)
{
    int i;

    if (src_end - src < 8 * 8)
        return NULL;

    for (i = 0; i < 8; i++) {
        memcpy(dst, src, 8);
        src += 8;
        dst += seq->frame->linesize[0];
    }

    return src;
}

static const unsigned char *seq_decode_op3(SeqVideoContext *seq,
                                           const unsigned char *src,
                                           const unsigned char *src_end,
                                           unsigned char *dst)
{
    int pos, offset;

    do {
        if (src_end - src < 2)
            return NULL;
        pos = *src++;
        offset = ((pos >> 3) & 7) * seq->frame->linesize[0] + (pos & 7);
        dst[offset] = *src++;
    } while (!(pos & 0x80));

    return src;
}

static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
{
    const unsigned char *data_end = data + data_size;
    GetBitContext gb;
    int flags, i, j, x, y, op;
    unsigned char c[3];
    unsigned char *dst;
    uint32_t *palette;

    flags = *data++;

    if (flags & 1) {
        palette = (uint32_t *)seq->frame->data[1];
        if (data_end - data < 256 * 3)
            return AVERROR_INVALIDDATA;
        for (i = 0; i < 256; i++) {
            for (j = 0; j < 3; j++, data++)
                c[j] = (*data << 2) | (*data >> 4);
            palette[i] = 0xFFU << 24 | AV_RB24(c);
        }
        seq->frame->palette_has_changed = 1;
    }

    if (flags & 2) {
        if (data_end - data < 128)
            return AVERROR_INVALIDDATA;
        init_get_bits(&gb, data, 128 * 8); data += 128;
        for (y = 0; y < 128; y += 8)
            for (x = 0; x < 256; x += 8) {
                dst = &seq->frame->data[0][y * seq->frame->linesize[0] + x];
                op = get_bits(&gb, 2);
                switch (op) {
                case 1:
                    data = seq_decode_op1(seq, data, data_end, dst);
                    break;
                case 2:
                    data = seq_decode_op2(seq, data, data_end, dst);
                    break;
                case 3:
                    data = seq_decode_op3(seq, data, data_end, dst);
                    break;
                }
                if (!data)
                    return AVERROR_INVALIDDATA;
            }
    }
    return 0;
}

static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
{
    SeqVideoContext *seq = avctx->priv_data;
    int ret;

    seq->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    ret = ff_set_dimensions(avctx, 256, 128);
    if (ret < 0)
        return ret;

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

    return 0;
}

static int seqvideo_decode_frame(AVCodecContext *avctx,
                                 void *data, int *got_frame,
                                 AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    int ret;

    SeqVideoContext *seq = avctx->priv_data;

    if ((ret = ff_reget_buffer(avctx, seq->frame, 0)) < 0)
        return ret;

    if (seqvideo_decode(seq, buf, buf_size))
        return AVERROR_INVALIDDATA;

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

    return buf_size;
}

static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
{
    SeqVideoContext *seq = avctx->priv_data;

    av_frame_free(&seq->frame);

    return 0;
}

AVCodec ff_tiertexseqvideo_decoder = {
    .name           = "tiertexseqvideo",
    .long_name      = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TIERTEXSEQVIDEO,
    .priv_data_size = sizeof(SeqVideoContext),
    .init           = seqvideo_decode_init,
    .close          = seqvideo_decode_end,
    .decode         = seqvideo_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Tiertex Limited SEQ Video Decoder
3			* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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			* Tiertex Limited SEQ video decoder
25			*/
26
27			#define BITSTREAM_READER_LE
28			#include "avcodec.h"
29			#include "get_bits.h"
30			#include "internal.h"
31
32
33			typedef struct SeqVideoContext {
34			AVCodecContext *avctx;
35			AVFrame *frame;
36			} SeqVideoContext;
37
38
39		2508	static const unsigned char seq_unpack_rle_block(const unsigned char src,
40			const unsigned char *src_end,
41			unsigned char *dst, int dst_size)
42			{
43			int i, len, sz;
44			GetBitContext gb;
45			int code_table[64];
46
47			/* get the rle codes */
48		2508	init_get_bits(&gb, src, (src_end - src) * 8);
49	✓✗✓✓	53386	for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
50	✗✓	50878	if (get_bits_left(&gb) < 4)
51			return NULL;
52		50878	code_table[i] = get_sbits(&gb, 4);
53		50878	sz += FFABS(code_table[i]);
54			}
55		2508	src += (get_bits_count(&gb) + 7) / 8;
56
57			/* do the rle unpacking */
58	✓✗✓✓	53386	for (i = 0; i < 64 && dst_size > 0; i++) {
59		50878	len = code_table[i];
60	✓✗	50878	if (len < 0) {
61		50878	len = -len;
62	✗✓	50878	if (src_end - src < 1)
63			return NULL;
64		50878	memset(dst, *src++, FFMIN(len, dst_size));
65			} else {
66			if (src_end - src < len)
67			return NULL;
68			memcpy(dst, src, FFMIN(len, dst_size));
69			src += len;
70			}
71		50878	dst += len;
72		50878	dst_size -= len;
73			}
74		2508	return src;
75			}
76
77		6758	static const unsigned char seq_decode_op1(SeqVideoContext seq,
78			const unsigned char *src,
79			const unsigned char *src_end,
80			unsigned char *dst)
81			{
82			const unsigned char *color_table;
83			int b, i, len, bits;
84			GetBitContext gb;
85			unsigned char block[8 * 8];
86
87	✗✓	6758	if (src_end - src < 1)
88			return NULL;
89		6758	len = *src++;
90	✓✓	6758	if (len & 0x80) {
91	✓✓✗	2508	switch (len & 3) {
92		1099	case 1:
93		1099	src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
94	✓✓	9891	for (b = 0; b < 8; b++) {
95		8792	memcpy(dst, &block[b * 8], 8);
96		8792	dst += seq->frame->linesize[0];
97			}
98		1099	break;
99		1409	case 2:
100		1409	src = seq_unpack_rle_block(src, src_end, block, sizeof(block));
101	✓✓	12681	for (i = 0; i < 8; i++) {
102	✓✓	101448	for (b = 0; b < 8; b++)
103		90176	dst[b * seq->frame->linesize[0]] = block[i * 8 + b];
104		11272	++dst;
105			}
106		1409	break;
107			}
108		2508	} else {
109	✗✓	4250	if (len <= 0)
110			return NULL;
111		4250	bits = ff_log2_tab[len - 1] + 1;
112	✗✓	4250	if (src_end - src < len + 8 * bits)
113			return NULL;
114		4250	color_table = src;
115		4250	src += len;
116		4250	init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8;
117	✓✓	38250	for (b = 0; b < 8; b++) {
118	✓✓	306000	for (i = 0; i < 8; i++)
119		272000	dst[i] = color_table[get_bits(&gb, bits)];
120		34000	dst += seq->frame->linesize[0];
121			}
122			}
123
124		6758	return src;
125			}
126
127		197	static const unsigned char seq_decode_op2(SeqVideoContext seq,
128			const unsigned char *src,
129			const unsigned char *src_end,
130			unsigned char *dst)
131			{
132			int i;
133
134	✗✓	197	if (src_end - src < 8 * 8)
135			return NULL;
136
137	✓✓	1773	for (i = 0; i < 8; i++) {
138		1576	memcpy(dst, src, 8);
139		1576	src += 8;
140		1576	dst += seq->frame->linesize[0];
141			}
142
143		197	return src;
144			}
145
146		3101	static const unsigned char seq_decode_op3(SeqVideoContext seq,
147			const unsigned char *src,
148			const unsigned char *src_end,
149			unsigned char *dst)
150			{
151			int pos, offset;
152
153			do {
154	✗✓	3101	if (src_end - src < 2)
155			return NULL;
156		3101	pos = *src++;
157		3101	offset = ((pos >> 3) & 7) * seq->frame->linesize[0] + (pos & 7);
158		3101	dst[offset] = *src++;
159	✓✓	3101	} while (!(pos & 0x80));
160
161		595	return src;
162			}
163
164		21	static int seqvideo_decode(SeqVideoContext seq, const unsigned char data, int data_size)
165			{
166		21	const unsigned char *data_end = data + data_size;
167			GetBitContext gb;
168			int flags, i, j, x, y, op;
169			unsigned char c[3];
170			unsigned char *dst;
171			uint32_t *palette;
172
173		21	flags = *data++;
174
175	✓✗	21	if (flags & 1) {
176		21	palette = (uint32_t *)seq->frame->data[1];
177	✗✓	21	if (data_end - data < 256 * 3)
178			return AVERROR_INVALIDDATA;
179	✓✓	5397	for (i = 0; i < 256; i++) {
180	✓✓	21504	for (j = 0; j < 3; j++, data++)
181		16128	c[j] = (data << 2) \| (data >> 4);
182		5376	palette[i] = 0xFFU << 24 \| AV_RB24(c);
183			}
184		21	seq->frame->palette_has_changed = 1;
185			}
186
187	✓✗	21	if (flags & 2) {
188	✗✓	21	if (data_end - data < 128)
189			return AVERROR_INVALIDDATA;
190		21	init_get_bits(&gb, data, 128 * 8); data += 128;
191	✓✓	357	for (y = 0; y < 128; y += 8)
192	✓✓	11088	for (x = 0; x < 256; x += 8) {
193		10752	dst = &seq->frame->data[0][y * seq->frame->linesize[0] + x];
194		10752	op = get_bits(&gb, 2);
195	✓✓✓✓	10752	switch (op) {
196		6758	case 1:
197		6758	data = seq_decode_op1(seq, data, data_end, dst);
198		6758	break;
199		197	case 2:
200		197	data = seq_decode_op2(seq, data, data_end, dst);
201		197	break;
202		595	case 3:
203		595	data = seq_decode_op3(seq, data, data_end, dst);
204		595	break;
205			}
206	✗✓	10752	if (!data)
207			return AVERROR_INVALIDDATA;
208			}
209			}
210		21	return 0;
211			}
212
213		2	static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
214			{
215		2	SeqVideoContext *seq = avctx->priv_data;
216			int ret;
217
218		2	seq->avctx = avctx;
219		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
220
221		2	ret = ff_set_dimensions(avctx, 256, 128);
222	✗✓	2	if (ret < 0)
223			return ret;
224
225		2	seq->frame = av_frame_alloc();
226	✗✓	2	if (!seq->frame)
227			return AVERROR(ENOMEM);
228
229		2	return 0;
230			}
231
232		21	static int seqvideo_decode_frame(AVCodecContext *avctx,
233			void data, int got_frame,
234			AVPacket *avpkt)
235			{
236		21	const uint8_t *buf = avpkt->data;
237		21	int buf_size = avpkt->size;
238			int ret;
239
240		21	SeqVideoContext *seq = avctx->priv_data;
241
242	✗✓	21	if ((ret = ff_reget_buffer(avctx, seq->frame, 0)) < 0)
243			return ret;
244
245	✗✓	21	if (seqvideo_decode(seq, buf, buf_size))
246			return AVERROR_INVALIDDATA;
247
248	✗✓	21	if ((ret = av_frame_ref(data, seq->frame)) < 0)
249			return ret;
250		21	*got_frame = 1;
251
252		21	return buf_size;
253			}
254
255		2	static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
256			{
257		2	SeqVideoContext *seq = avctx->priv_data;
258
259		2	av_frame_free(&seq->frame);
260
261		2	return 0;
262			}
263
264			AVCodec ff_tiertexseqvideo_decoder = {
265			.name = "tiertexseqvideo",
266			.long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"),
267			.type = AVMEDIA_TYPE_VIDEO,
268			.id = AV_CODEC_ID_TIERTEXSEQVIDEO,
269			.priv_data_size = sizeof(SeqVideoContext),
270			.init = seqvideo_decode_init,
271			.close = seqvideo_decode_end,
272			.decode = seqvideo_decode_frame,
273			.capabilities = AV_CODEC_CAP_DR1,
274			};