FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* MidiVid decoder
3			* Copyright (c) 2019 Paul B Mahol
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			#include "libavutil/attributes.h"
23			#include "libavutil/imgutils.h"
24			#include "libavutil/internal.h"
25			#include "libavutil/mem.h"
26
27			#define BITSTREAM_READER_LE
28			#include "avcodec.h"
29			#include "get_bits.h"
30			#include "bytestream.h"
31			#include "codec_internal.h"
32			#include "decode.h"
33
34			typedef struct MidiVidContext {
35			GetByteContext gb;
36
37			uint8_t *uncompressed;
38			unsigned int uncompressed_size;
39			uint8_t *skip;
40
41			AVFrame *frame;
42			} MidiVidContext;
43
44		✗	static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame)
45			{
46		✗	GetByteContext *gb = &s->gb;
47			GetBitContext mask;
48			GetByteContext idx9;
49			uint16_t nb_vectors, intra_flag;
50			const uint8_t *vec;
51			const uint8_t *mask_start;
52			uint8_t *skip;
53			uint32_t mask_size;
54		✗	int idx9bits = 0;
55		✗	int idx9val = 0;
56			uint32_t nb_blocks;
57
58		✗	nb_vectors = bytestream2_get_le16(gb);
59		✗	intra_flag = !!bytestream2_get_le16(gb);
60		✗	if (intra_flag) {
61		✗	nb_blocks = (avctx->width / 2) * (avctx->height / 2);
62			} else {
63			int ret, skip_linesize, padding;
64
65		✗	nb_blocks = bytestream2_get_le32(gb);
66		✗	skip_linesize = avctx->width >> 1;
67		✗	mask_start = gb->buffer_start + bytestream2_tell(gb);
68		✗	mask_size = (FFALIGN(avctx->width, 32) >> 2) * (avctx->height >> 2) >> 3;
69		✗	padding = (FFALIGN(avctx->width, 32) - avctx->width) >> 2;
70
71		✗	if (bytestream2_get_bytes_left(gb) < mask_size)
72		✗	return AVERROR_INVALIDDATA;
73
74		✗	ret = init_get_bits8(&mask, mask_start, mask_size);
75		✗	if (ret < 0)
76		✗	return ret;
77		✗	bytestream2_skip(gb, mask_size);
78		✗	skip = s->skip;
79
80		✗	for (int y = 0; y < avctx->height >> 2; y++) {
81		✗	for (int x = 0; x < avctx->width >> 2; x++) {
82		✗	int flag = !get_bits1(&mask);
83
84		✗	skip[(y*2) *skip_linesize + x*2 ] = flag;
85		✗	skip[(y*2) *skip_linesize + x*2+1] = flag;
86		✗	skip[(y*2+1)*skip_linesize + x*2 ] = flag;
87		✗	skip[(y*2+1)*skip_linesize + x*2+1] = flag;
88			}
89		✗	skip_bits_long(&mask, padding);
90			}
91			}
92
93		✗	vec = gb->buffer_start + bytestream2_tell(gb);
94		✗	if (bytestream2_get_bytes_left(gb) < nb_vectors * 12)
95		✗	return AVERROR_INVALIDDATA;
96		✗	bytestream2_skip(gb, nb_vectors * 12);
97		✗	if (nb_vectors > 256) {
98		✗	if (bytestream2_get_bytes_left(gb) < (nb_blocks + 7 * !intra_flag) / 8)
99		✗	return AVERROR_INVALIDDATA;
100		✗	bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7 * !intra_flag) / 8);
101		✗	bytestream2_skip(gb, (nb_blocks + 7 * !intra_flag) / 8);
102			}
103
104		✗	skip = s->skip;
105
106		✗	for (int y = avctx->height - 2; y >= 0; y -= 2) {
107		✗	uint8_t *dsty = frame->data[0] + y * frame->linesize[0];
108		✗	uint8_t *dstu = frame->data[1] + y * frame->linesize[1];
109		✗	uint8_t *dstv = frame->data[2] + y * frame->linesize[2];
110
111		✗	for (int x = 0; x < avctx->width; x += 2) {
112			int idx;
113
114		✗	if (!intra_flag && *skip++)
115		✗	continue;
116		✗	if (bytestream2_get_bytes_left(gb) <= 0)
117		✗	return AVERROR_INVALIDDATA;
118		✗	if (nb_vectors <= 256) {
119		✗	idx = bytestream2_get_byte(gb);
120			} else {
121		✗	if (idx9bits == 0) {
122		✗	idx9val = bytestream2_get_byte(&idx9);
123		✗	idx9bits = 8;
124			}
125		✗	idx9bits--;
126		✗	idx = bytestream2_get_byte(gb) | (((idx9val >> (7 - idx9bits)) & 1) << 8);
127			}
128		✗	if (idx >= nb_vectors)
129		✗	return AVERROR_INVALIDDATA;
130
131		✗	dsty[x +frame->linesize[0]] = vec[idx * 12 + 0];
132		✗	dsty[x+1+frame->linesize[0]] = vec[idx * 12 + 3];
133		✗	dsty[x] = vec[idx * 12 + 6];
134		✗	dsty[x+1] = vec[idx * 12 + 9];
135
136		✗	dstu[x +frame->linesize[1]] = vec[idx * 12 + 1];
137		✗	dstu[x+1+frame->linesize[1]] = vec[idx * 12 + 4];
138		✗	dstu[x] = vec[idx * 12 + 7];
139		✗	dstu[x+1] = vec[idx * 12 +10];
140
141		✗	dstv[x +frame->linesize[2]] = vec[idx * 12 + 2];
142		✗	dstv[x+1+frame->linesize[2]] = vec[idx * 12 + 5];
143		✗	dstv[x] = vec[idx * 12 + 8];
144		✗	dstv[x+1] = vec[idx * 12 +11];
145			}
146			}
147
148		✗	return intra_flag;
149			}
150
151		✗	static ptrdiff_t lzss_uncompress(MidiVidContext *s, GetByteContext *gb, uint8_t *dst, unsigned int size)
152			{
153		✗	uint8_t *dst_start = dst;
154		✗	uint8_t *dst_end = dst + size;
155
156		✗	for (;bytestream2_get_bytes_left(gb) >= 3;) {
157		✗	int op = bytestream2_get_le16(gb);
158
159		✗	for (int i = 0; i < 16; i++) {
160		✗	if (op & 1) {
161		✗	int s0 = bytestream2_get_byte(gb);
162		✗	int s1 = bytestream2_get_byte(gb);
163		✗	int offset = ((s0 & 0xF0) << 4) | s1;
164		✗	int length = (s0 & 0xF) + 3;
165
166		✗	if (dst + length > dst_end ||
167		✗	dst - offset < dst_start)
168		✗	return AVERROR_INVALIDDATA;
169		✗	if (offset > 0) {
170		✗	for (int j = 0; j < length; j++) {
171		✗	dst[j] = dst[j - offset];
172			}
173			}
174		✗	dst += length;
175			} else {
176		✗	if (dst >= dst_end)
177		✗	return AVERROR_INVALIDDATA;
178		✗	*dst++ = bytestream2_get_byte(gb);
179			}
180		✗	op >>= 1;
181			}
182			}
183
184		✗	return dst - dst_start;
185			}
186
187		✗	static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
188			int *got_frame, AVPacket *avpkt)
189			{
190		✗	MidiVidContext *s = avctx->priv_data;
191		✗	GetByteContext *gb = &s->gb;
192		✗	AVFrame *frame = s->frame;
193			int ret, key, uncompressed;
194
195		✗	if (avpkt->size <= 13)
196		✗	return AVERROR_INVALIDDATA;
197
198		✗	bytestream2_init(gb, avpkt->data, avpkt->size);
199		✗	bytestream2_skip(gb, 8);
200		✗	uncompressed = bytestream2_get_le32(gb);
201
202		✗	if (!uncompressed) {
203		✗	av_fast_padded_malloc(&s->uncompressed, &s->uncompressed_size, 16LL * (avpkt->size - 12));
204		✗	if (!s->uncompressed)
205		✗	return AVERROR(ENOMEM);
206
207		✗	ret = lzss_uncompress(s, gb, s->uncompressed, s->uncompressed_size);
208		✗	if (ret < 0)
209		✗	return ret;
210		✗	bytestream2_init(gb, s->uncompressed, ret);
211			}
212
213		✗	if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
214		✗	return ret;
215
216		✗	ret = decode_mvdv(s, avctx, frame);
217
218		✗	if (ret < 0)
219		✗	return ret;
220		✗	key = ret;
221
222		✗	if ((ret = av_frame_ref(rframe, s->frame)) < 0)
223		✗	return ret;
224
225		✗	frame->pict_type = key ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
226		✗	if (key)
227		✗	frame->flags |= AV_FRAME_FLAG_KEY;
228			else
229		✗	frame->flags &= ~AV_FRAME_FLAG_KEY;
230		✗	*got_frame = 1;
231
232		✗	return avpkt->size;
233			}
234
235		✗	static av_cold int decode_init(AVCodecContext *avctx)
236			{
237		✗	MidiVidContext *s = avctx->priv_data;
238		✗	int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
239
240		✗	if (avctx->width & 3 || avctx->height & 3)
241		✗	ret = AVERROR_INVALIDDATA;
242
243		✗	if (ret < 0) {
244		✗	av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
245			avctx->width, avctx->height);
246		✗	return ret;
247			}
248
249		✗	avctx->pix_fmt = AV_PIX_FMT_YUV444P;
250
251		✗	s->frame = av_frame_alloc();
252		✗	if (!s->frame)
253		✗	return AVERROR(ENOMEM);
254		✗	s->skip = av_calloc(avctx->width >> 1, avctx->height >> 1);
255		✗	if (!s->skip)
256		✗	return AVERROR(ENOMEM);
257
258		✗	return 0;
259			}
260
261		✗	static av_cold void decode_flush(AVCodecContext *avctx)
262			{
263		✗	MidiVidContext *s = avctx->priv_data;
264
265		✗	av_frame_unref(s->frame);
266		✗	}
267
268		✗	static av_cold int decode_close(AVCodecContext *avctx)
269			{
270		✗	MidiVidContext *s = avctx->priv_data;
271
272		✗	av_frame_free(&s->frame);
273		✗	av_freep(&s->uncompressed);
274		✗	av_freep(&s->skip);
275
276		✗	return 0;
277			}
278
279			const FFCodec ff_mvdv_decoder = {
280			.p.name = "mvdv",
281			CODEC_LONG_NAME("MidiVid VQ"),
282			.p.type = AVMEDIA_TYPE_VIDEO,
283			.p.id = AV_CODEC_ID_MVDV,
284			.priv_data_size = sizeof(MidiVidContext),
285			.init = decode_init,
286			FF_CODEC_DECODE_CB(decode_frame),
287			.flush = decode_flush,
288			.close = decode_close,
289			.p.capabilities = AV_CODEC_CAP_DR1,
290			.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
291			};
292