1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* Duck TrueMotion 2.0 Real Time decoder
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
typedef struct TrueMotion2RTContext {
GetBitContext gb;
int delta_size;
int hscale;
} TrueMotion2RTContext;
static const int16_t delta_tab2[] = {
5, -7, 36, -36,
};
static const int16_t delta_tab3[] = {
2, -3, 8, -8, 18, -18, 36, -36,
};
static const int16_t delta_tab4[] = {
1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
};
static const int16_t *const delta_tabs[] = {
delta_tab2, delta_tab3, delta_tab4,
};
/* Returns the number of bytes consumed from the bytestream, or
* AVERROR_INVALIDDATA if there was an error while decoding the header. */
static int truemotion2rt_decode_header(AVCodecContext *avctx, AVPacket *avpkt)
{
TrueMotion2RTContext *s = avctx->priv_data;
int header_size;
uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */
const uint8_t *buf = avpkt->data;
int size = avpkt->size;
int width, height;
int ret, i;
if (size < 1) {
av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
return AVERROR_INVALIDDATA;
}
header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
if (header_size < 10) {
av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
return AVERROR_INVALIDDATA;
}
if (header_size + 1 > size) {
av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
return AVERROR_INVALIDDATA;
}
/* unscramble the header bytes with a XOR operation */
for (i = 1; i < header_size; i++)
header_buffer[i - 1] = buf[i] ^ buf[i + 1];
s->delta_size = header_buffer[1];
s->hscale = 1 + !!header_buffer[3];
if (s->delta_size < 2 || s->delta_size > 4)
return AVERROR_INVALIDDATA;
height = AV_RL16(header_buffer + 5);
width = AV_RL16(header_buffer + 7);
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
return header_size;
}
static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
TrueMotion2RTContext *s = avctx->priv_data;
AVFrame * const p = data;
GetBitContext *gb = &s->gb;
uint8_t *dst;
int x, y, delta_mode;
int ret;
ret = truemotion2rt_decode_header(avctx, avpkt);
if (ret < 0)
return ret;
ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
if (ret < 0)
return ret;
ret = ff_get_buffer(avctx, p, 0);
if (ret < 0)
return ret;
skip_bits(gb, 32);
delta_mode = s->delta_size - 2;
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
int diff = 0;
for (x = 0; x < avctx->width; x += s->hscale) {
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
}
dst += p->linesize[0];
}
if (s->hscale > 1) {
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
for (x = 1; x < avctx->width; x += s->hscale)
dst[x] = dst[x - 1];
dst += p->linesize[0];
}
}
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
for (x = 0; x < avctx->width; x++)
dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
dst += p->linesize[0];
}
dst = p->data[1];
for (y = 0; y < avctx->height >> 2; y++) {
int diff = 0;
for (x = 0; x < avctx->width >> 2; x += s->hscale) {
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
}
dst += p->linesize[1];
}
if (s->hscale > 1) {
dst = p->data[1];
for (y = 0; y < avctx->height >> 2; y++) {
for (x = 1; x < avctx->width >> 2; x += s->hscale)
dst[x] = dst[x - 1];
dst += p->linesize[1];
}
}
dst = p->data[1];
for (y = 0; y < avctx->height >> 2; y++) {
for (x = 0; x < avctx->width >> 2; x++)
dst[x] += (dst[x] - 128) / 8;
dst += p->linesize[1];
}
dst = p->data[2];
for (y = 0; y < avctx->height >> 2; y++) {
int diff = 0;
for (x = 0; x < avctx->width >> 2; x += s->hscale) {
diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
}
dst += p->linesize[2];
}
if (s->hscale > 1) {
dst = p->data[2];
for (y = 0; y < avctx->height >> 2; y++) {
for (x = 1; x < avctx->width >> 2; x += s->hscale)
dst[x] = dst[x - 1];
dst += p->linesize[2];
}
}
dst = p->data[2];
for (y = 0; y < avctx->height >> 2; y++) {
for (x = 0; x < avctx->width >> 2; x++)
dst[x] += (dst[x] - 128) / 8;
dst += p->linesize[2];
}
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
return 0;
}
AVCodec ff_truemotion2rt_decoder = {
.name = "truemotion2rt",
.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TRUEMOTION2RT,
.priv_data_size = sizeof(TrueMotion2RTContext),
.init = truemotion2rt_decode_init,
.decode = truemotion2rt_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
|
