FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/truemotion2rt.c
Date: 2025-07-15 19:03:42
Exec Total Coverage
Lines: 91 103 88.3%
Functions: 3 3 100.0%
Branches: 62 72 86.1%
Line Branch Exec Source
1 /*
2 * Duck TrueMotion 2.0 Real Time decoder
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/internal.h"
22 #include "libavutil/intreadwrite.h"
23
24 #define BITSTREAM_READER_LE
25 #include "avcodec.h"
26 #include "codec_internal.h"
27 #include "decode.h"
28 #include "get_bits.h"
29
30 typedef struct TrueMotion2RTContext {
31 GetBitContext gb;
32 int delta_size;
33 int hscale;
34 } TrueMotion2RTContext;
35
36 static const int16_t delta_tab2[] = {
37 5, -7, 36, -36,
38 };
39
40 static const int16_t delta_tab3[] = {
41 2, -3, 8, -8, 18, -18, 36, -36,
42 };
43
44 static const int16_t delta_tab4[] = {
45 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
46 };
47
48 static const int16_t *const delta_tabs[] = {
49 delta_tab2, delta_tab3, delta_tab4,
50 };
51
52 /* Returns the number of bytes consumed from the bytestream, or
53 * AVERROR_INVALIDDATA if there was an error while decoding the header. */
54 3 static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
55 {
56 3 TrueMotion2RTContext *s = avctx->priv_data;
57 int header_size;
58 3 uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */
59 3 const uint8_t *buf = avpkt->data;
60 3 int size = avpkt->size;
61 int width, height;
62 int ret, i;
63
64
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 3 if (size < 1) {
65 ✗ av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
66 ✗ return AVERROR_INVALIDDATA;
67 }
68
69 3 header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
70
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 3 if (header_size < 10) {
71 ✗ av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
72 ✗ return AVERROR_INVALIDDATA;
73 }
74
75
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 3 if (header_size + 1 > size) {
76 ✗ av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
77 ✗ return AVERROR_INVALIDDATA;
78 }
79
80 /* unscramble the header bytes with a XOR operation */
81
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 60 for (i = 1; i < header_size; i++)
82 57 header_buffer[i - 1] = buf[i] ^ buf[i + 1];
83
84 3 s->delta_size = header_buffer[1];
85
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 3 s->hscale = 1 + !!header_buffer[3];
86
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 3 if (s->delta_size < 2 || s->delta_size > 4)
87 ✗ return AVERROR_INVALIDDATA;
88
89 3 height = AV_RL16(header_buffer + 5);
90 3 width = AV_RL16(header_buffer + 7);
91
92 3 ret = ff_set_dimensions(avctx, width, height);
93
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 3 if (ret < 0)
94 ✗ return ret;
95
96 3 av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
97 3 return header_size;
98 }
99
100 3 static int truemotion2rt_decode_frame(AVCodecContext *avctx, AVFrame *p,
101 int *got_frame, AVPacket *avpkt)
102 {
103 3 TrueMotion2RTContext *s = avctx->priv_data;
104 3 GetBitContext *gb = &s->gb;
105 uint8_t *dst;
106 int x, y, delta_mode;
107 int ret;
108
109 3 ret = truemotion2rt_decode_header(avctx, avpkt);
110
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 3 if (ret < 0)
111 ✗ return ret;
112
113
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 3 if ((avctx->width + s->hscale - 1)/ s->hscale * avctx->height * s->delta_size > avpkt->size * 8LL * 4)
114 ✗ return AVERROR_INVALIDDATA;
115
116 3 ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
117
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 3 if (ret < 0)
118 ✗ return ret;
119
120 3 ret = ff_get_buffer(avctx, p, 0);
121
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 3 if (ret < 0)
122 ✗ return ret;
123
124 3 skip_bits(gb, 32);
125 3 delta_mode = s->delta_size - 2;
126 3 dst = p->data[0];
127
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 663 for (y = 0; y < avctx->height; y++) {
128 660 int diff = 0;
129
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 93428 for (x = 0; x < avctx->width; x += s->hscale) {
130 92768 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
131
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 92768 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
132 }
133 660 dst += p->linesize[0];
134 }
135
136
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 3 if (s->hscale > 1) {
137 2 dst = p->data[0];
138
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 430 for (y = 0; y < avctx->height; y++) {
139
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 44940 for (x = 1; x < avctx->width; x += s->hscale)
140 44512 dst[x] = dst[x - 1];
141 428 dst += p->linesize[0];
142 }
143 }
144
145 3 dst = p->data[0];
146
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147
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 137940 for (x = 0; x < avctx->width; x++)
148 137280 dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
149 660 dst += p->linesize[0];
150 }
151
152 3 dst = p->data[1];
153
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 168 for (y = 0; y < avctx->height >> 2; y++) {
154 165 int diff = 0;
155
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 5963 for (x = 0; x < avctx->width >> 2; x += s->hscale) {
156 5798 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
157
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 5798 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
158 }
159 165 dst += p->linesize[1];
160 }
161
162
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 3 if (s->hscale > 1) {
163 2 dst = p->data[1];
164
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165
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 2889 for (x = 1; x < avctx->width >> 2; x += s->hscale)
166 2782 dst[x] = dst[x - 1];
167 107 dst += p->linesize[1];
168 }
169 }
170
171 3 dst = p->data[1];
172
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173
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174 8580 dst[x] += (dst[x] - 128) / 8;
175 165 dst += p->linesize[1];
176 }
177
178 3 dst = p->data[2];
179
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 168 for (y = 0; y < avctx->height >> 2; y++) {
180 165 int diff = 0;
181
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182 5798 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
183
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 5798 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
184 }
185 165 dst += p->linesize[2];
186 }
187
188
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 3 if (s->hscale > 1) {
189 2 dst = p->data[2];
190
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191
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192 2782 dst[x] = dst[x - 1];
193 107 dst += p->linesize[2];
194 }
195 }
196
197 3 dst = p->data[2];
198
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199
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200 8580 dst[x] += (dst[x] - 128) / 8;
201 165 dst += p->linesize[2];
202 }
203
204 3 *got_frame = 1;
205
206 3 return avpkt->size;
207 }
208
209 6 static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
210 {
211 6 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
212 6 return 0;
213 }
214
215 const FFCodec ff_truemotion2rt_decoder = {
216 .p.name = "truemotion2rt",
217 CODEC_LONG_NAME("Duck TrueMotion 2.0 Real Time"),
218 .p.type = AVMEDIA_TYPE_VIDEO,
219 .p.id = AV_CODEC_ID_TRUEMOTION2RT,
220 .priv_data_size = sizeof(TrueMotion2RTContext),
221 .init = truemotion2rt_decode_init,
222 FF_CODEC_DECODE_CB(truemotion2rt_decode_frame),
223 .p.capabilities = AV_CODEC_CAP_DR1,
224 };
225