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 <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24
25 #include "libavutil/imgutils.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "internal.h"
34
35 typedef struct TrueMotion2RTContext {
36 GetBitContext gb;
37 int delta_size;
38 int hscale;
39 } TrueMotion2RTContext;
40
41 static const int16_t delta_tab2[] = {
42 5, -7, 36, -36,
43 };
44
45 static const int16_t delta_tab3[] = {
46 2, -3, 8, -8, 18, -18, 36, -36,
47 };
48
49 static const int16_t delta_tab4[] = {
50 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144,
51 };
52
53 static const int16_t *const delta_tabs[] = {
54 delta_tab2, delta_tab3, delta_tab4,
55 };
56
57 /* Returns the number of bytes consumed from the bytestream, or
58 * AVERROR_INVALIDDATA if there was an error while decoding the header. */
truemotion2rt_decode_header(AVCodecContext * avctx,const AVPacket * avpkt)59 static int truemotion2rt_decode_header(AVCodecContext *avctx, const AVPacket *avpkt)
60 {
61 TrueMotion2RTContext *s = avctx->priv_data;
62 int header_size;
63 uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */
64 const uint8_t *buf = avpkt->data;
65 int size = avpkt->size;
66 int width, height;
67 int ret, i;
68
69 if (size < 1) {
70 av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
71 return AVERROR_INVALIDDATA;
72 }
73
74 header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f;
75 if (header_size < 10) {
76 av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size);
77 return AVERROR_INVALIDDATA;
78 }
79
80 if (header_size + 1 > size) {
81 av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size);
82 return AVERROR_INVALIDDATA;
83 }
84
85 /* unscramble the header bytes with a XOR operation */
86 for (i = 1; i < header_size; i++)
87 header_buffer[i - 1] = buf[i] ^ buf[i + 1];
88
89 s->delta_size = header_buffer[1];
90 s->hscale = 1 + !!header_buffer[3];
91 if (s->delta_size < 2 || s->delta_size > 4)
92 return AVERROR_INVALIDDATA;
93
94 height = AV_RL16(header_buffer + 5);
95 width = AV_RL16(header_buffer + 7);
96
97 ret = ff_set_dimensions(avctx, width, height);
98 if (ret < 0)
99 return ret;
100
101 av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size);
102 return header_size;
103 }
104
truemotion2rt_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)105 static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data,
106 int *got_frame, AVPacket *avpkt)
107 {
108 TrueMotion2RTContext *s = avctx->priv_data;
109 AVFrame * const p = data;
110 GetBitContext *gb = &s->gb;
111 uint8_t *dst;
112 int x, y, delta_mode;
113 int ret;
114
115 ret = truemotion2rt_decode_header(avctx, avpkt);
116 if (ret < 0)
117 return ret;
118
119 if ((avctx->width + s->hscale - 1)/ s->hscale * avctx->height * s->delta_size > avpkt->size * 8LL * 4)
120 return AVERROR_INVALIDDATA;
121
122 ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret);
123 if (ret < 0)
124 return ret;
125
126 ret = ff_get_buffer(avctx, p, 0);
127 if (ret < 0)
128 return ret;
129
130 skip_bits(gb, 32);
131 delta_mode = s->delta_size - 2;
132 dst = p->data[0];
133 for (y = 0; y < avctx->height; y++) {
134 int diff = 0;
135 for (x = 0; x < avctx->width; x += s->hscale) {
136 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
137 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff);
138 }
139 dst += p->linesize[0];
140 }
141
142 if (s->hscale > 1) {
143 dst = p->data[0];
144 for (y = 0; y < avctx->height; y++) {
145 for (x = 1; x < avctx->width; x += s->hscale)
146 dst[x] = dst[x - 1];
147 dst += p->linesize[0];
148 }
149 }
150
151 dst = p->data[0];
152 for (y = 0; y < avctx->height; y++) {
153 for (x = 0; x < avctx->width; x++)
154 dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3);
155 dst += p->linesize[0];
156 }
157
158 dst = p->data[1];
159 for (y = 0; y < avctx->height >> 2; y++) {
160 int diff = 0;
161 for (x = 0; x < avctx->width >> 2; x += s->hscale) {
162 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
163 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff);
164 }
165 dst += p->linesize[1];
166 }
167
168 if (s->hscale > 1) {
169 dst = p->data[1];
170 for (y = 0; y < avctx->height >> 2; y++) {
171 for (x = 1; x < avctx->width >> 2; x += s->hscale)
172 dst[x] = dst[x - 1];
173 dst += p->linesize[1];
174 }
175 }
176
177 dst = p->data[1];
178 for (y = 0; y < avctx->height >> 2; y++) {
179 for (x = 0; x < avctx->width >> 2; x++)
180 dst[x] += (dst[x] - 128) / 8;
181 dst += p->linesize[1];
182 }
183
184 dst = p->data[2];
185 for (y = 0; y < avctx->height >> 2; y++) {
186 int diff = 0;
187 for (x = 0; x < avctx->width >> 2; x += s->hscale) {
188 diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)];
189 dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff);
190 }
191 dst += p->linesize[2];
192 }
193
194 if (s->hscale > 1) {
195 dst = p->data[2];
196 for (y = 0; y < avctx->height >> 2; y++) {
197 for (x = 1; x < avctx->width >> 2; x += s->hscale)
198 dst[x] = dst[x - 1];
199 dst += p->linesize[2];
200 }
201 }
202
203 dst = p->data[2];
204 for (y = 0; y < avctx->height >> 2; y++) {
205 for (x = 0; x < avctx->width >> 2; x++)
206 dst[x] += (dst[x] - 128) / 8;
207 dst += p->linesize[2];
208 }
209
210 p->pict_type = AV_PICTURE_TYPE_I;
211 p->key_frame = 1;
212 *got_frame = 1;
213
214 return avpkt->size;
215 }
216
truemotion2rt_decode_init(AVCodecContext * avctx)217 static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx)
218 {
219 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
220 return 0;
221 }
222
223 AVCodec ff_truemotion2rt_decoder = {
224 .name = "truemotion2rt",
225 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"),
226 .type = AVMEDIA_TYPE_VIDEO,
227 .id = AV_CODEC_ID_TRUEMOTION2RT,
228 .priv_data_size = sizeof(TrueMotion2RTContext),
229 .init = truemotion2rt_decode_init,
230 .decode = truemotion2rt_decode_frame,
231 .capabilities = AV_CODEC_CAP_DR1,
232 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
233 };
234