FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/indeo2.c
Date: 2025-07-01 21:35:40
Exec Total Coverage
Lines: 104 127 81.9%
Functions: 7 7 100.0%
Branches: 44 66 66.7%
Line Branch Exec Source
1 /*
2 * Intel Indeo 2 codec
3 * Copyright (c) 2005 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 * Intel Indeo 2 decoder.
25 */
26
27 #include "libavutil/attributes.h"
28 #include "libavutil/thread.h"
29
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "get_bits.h"
35 #include "indeo2data.h"
36
37 typedef struct Ir2Context{
38 AVCodecContext *avctx;
39 AVFrame *picture;
40 GetBitContext gb;
41 int decode_delta;
42 } Ir2Context;
43
44 #define CODE_VLC_BITS 14
45 static VLCElem ir2_vlc[1 << CODE_VLC_BITS];
46
47 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
48 2449607 static inline int ir2_get_code(GetBitContext *gb)
49 {
50 2449607 return get_vlc2(gb, ir2_vlc, CODE_VLC_BITS, 1);
51 }
52
53 633 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
54 int pitch, const uint8_t *table)
55 {
56 int i;
57 int j;
58 633 int out = 0;
59
60
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 633 if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
61 ✗ return AVERROR_INVALIDDATA;
62
63 /* first line contain absolute values, other lines contain deltas */
64
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 25864 while (out < width) {
65 25231 int c = ir2_get_code(&ctx->gb);
66
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 25231 if (c >= 0x80) { /* we have a run */
67 338 c -= 0x7F;
68
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 338 if (out + c*2 > width)
69 ✗ return AVERROR_INVALIDDATA;
70
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 1192 for (i = 0; i < c * 2; i++)
71 854 dst[out++] = 0x80;
72 } else { /* copy two values from table */
73
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 24893 if (c <= 0)
74 ✗ return AVERROR_INVALIDDATA;
75 24893 dst[out++] = table[c * 2];
76 24893 dst[out++] = table[(c * 2) + 1];
77 }
78 }
79 633 dst += pitch;
80
81
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 37980 for (j = 1; j < height; j++) {
82 37347 out = 0;
83
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 2152428 while (out < width) {
84 int c;
85
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 2115081 if (get_bits_left(&ctx->gb) <= 0)
86 ✗ return AVERROR_INVALIDDATA;
87 2115081 c = ir2_get_code(&ctx->gb);
88
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 2115081 if (c >= 0x80) { /* we have a skip */
89 228280 c -= 0x7F;
90
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 228280 if (out + c*2 > width)
91 ✗ return AVERROR_INVALIDDATA;
92
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 961638 for (i = 0; i < c * 2; i++) {
93 733358 dst[out] = dst[out - pitch];
94 733358 out++;
95 }
96 } else { /* add two deltas from table */
97 int t;
98
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 1886801 if (c <= 0)
99 ✗ return AVERROR_INVALIDDATA;
100 1886801 t = dst[out - pitch] + (table[c * 2] - 128);
101 1886801 t = av_clip_uint8(t);
102 1886801 dst[out] = t;
103 1886801 out++;
104 1886801 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
105 1886801 t = av_clip_uint8(t);
106 1886801 dst[out] = t;
107 1886801 out++;
108 }
109 }
110 37347 dst += pitch;
111 }
112 633 return 0;
113 }
114
115 99 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
116 int pitch, const uint8_t *table)
117 {
118 int j;
119 99 int out = 0;
120 int c;
121 int t;
122
123
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 99 if (width & 1)
124 ✗ return AVERROR_INVALIDDATA;
125
126
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 6039 for (j = 0; j < height; j++) {
127 5940 out = 0;
128
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 315235 while (out < width) {
129
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 309295 if (get_bits_left(&ctx->gb) <= 0)
130 ✗ return AVERROR_INVALIDDATA;
131 309295 c = ir2_get_code(&ctx->gb);
132
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 309295 if (c >= 0x80) { /* we have a skip */
133 56657 c -= 0x7F;
134 56657 out += c * 2;
135 } else { /* add two deltas from table */
136
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 252638 if (c <= 0)
137 ✗ return AVERROR_INVALIDDATA;
138 252638 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
139 252638 t = av_clip_uint8(t);
140 252638 dst[out] = t;
141 252638 out++;
142 252638 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
143 252638 t = av_clip_uint8(t);
144 252638 dst[out] = t;
145 252638 out++;
146 }
147 }
148 5940 dst += pitch;
149 }
150 99 return 0;
151 }
152
153 244 static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture,
154 int *got_frame, AVPacket *avpkt)
155 {
156 244 Ir2Context * const s = avctx->priv_data;
157 244 const uint8_t *buf = avpkt->data;
158 244 int buf_size = avpkt->size;
159 244 AVFrame * const p = s->picture;
160 int start, ret;
161 int ltab, ctab;
162
163
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 244 if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
164 ✗ return ret;
165
166 244 start = 48; /* hardcoded for now */
167
168
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 244 if (start >= buf_size) {
169 ✗ av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
170 ✗ return AVERROR_INVALIDDATA;
171 }
172
173 244 s->decode_delta = buf[18];
174
175 /* decide whether frame uses deltas or not */
176
177
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 244 if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
178 ✗ return ret;
179
180 244 ltab = buf[0x22] & 3;
181 244 ctab = buf[0x22] >> 2;
182
183
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 244 if (ctab > 3) {
184 ✗ av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
185 ✗ return AVERROR_INVALIDDATA;
186 }
187
188
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 244 if (s->decode_delta) { /* intraframe */
189
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 211 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
190 p->data[0], p->linesize[0],
191 211 ir2_delta_table[ltab])) < 0)
192 ✗ return ret;
193
194 /* swapped U and V */
195
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 211 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
196 p->data[2], p->linesize[2],
197 211 ir2_delta_table[ctab])) < 0)
198 ✗ return ret;
199
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 211 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
200 p->data[1], p->linesize[1],
201 211 ir2_delta_table[ctab])) < 0)
202 ✗ return ret;
203 } else { /* interframe */
204
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 33 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
205 p->data[0], p->linesize[0],
206 33 ir2_delta_table[ltab])) < 0)
207 ✗ return ret;
208 /* swapped U and V */
209
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 33 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
210 p->data[2], p->linesize[2],
211 33 ir2_delta_table[ctab])) < 0)
212 ✗ return ret;
213
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 33 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
214 p->data[1], p->linesize[1],
215 33 ir2_delta_table[ctab])) < 0)
216 ✗ return ret;
217 }
218
219
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 244 if ((ret = av_frame_ref(picture, p)) < 0)
220 ✗ return ret;
221
222 244 *got_frame = 1;
223
224 244 return buf_size;
225 }
226
227 2 static av_cold void ir2_init_static(void)
228 {
229 2 VLC_INIT_STATIC_TABLE_FROM_LENGTHS(ir2_vlc, CODE_VLC_BITS, IR2_CODES,
230 &ir2_tab[0][1], 2, &ir2_tab[0][0], 2, 1,
231 0, VLC_INIT_OUTPUT_LE);
232 2 }
233
234 4 static av_cold int ir2_decode_init(AVCodecContext *avctx)
235 {
236 static AVOnce init_static_once = AV_ONCE_INIT;
237 4 Ir2Context * const ic = avctx->priv_data;
238
239 4 ic->avctx = avctx;
240
241 4 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
242
243 4 ic->picture = av_frame_alloc();
244
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 4 if (!ic->picture)
245 ✗ return AVERROR(ENOMEM);
246
247 4 ff_thread_once(&init_static_once, ir2_init_static);
248
249 4 return 0;
250 }
251
252 4 static av_cold int ir2_decode_end(AVCodecContext *avctx)
253 {
254 4 Ir2Context * const ic = avctx->priv_data;
255
256 4 av_frame_free(&ic->picture);
257
258 4 return 0;
259 }
260
261 const FFCodec ff_indeo2_decoder = {
262 .p.name = "indeo2",
263 CODEC_LONG_NAME("Intel Indeo 2"),
264 .p.type = AVMEDIA_TYPE_VIDEO,
265 .p.id = AV_CODEC_ID_INDEO2,
266 .priv_data_size = sizeof(Ir2Context),
267 .init = ir2_decode_init,
268 .close = ir2_decode_end,
269 FF_CODEC_DECODE_CB(ir2_decode_frame),
270 .p.capabilities = AV_CODEC_CAP_DR1,
271 };
272