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
29 #define BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "indeo2data.h"
33 #include "internal.h"
34 #include "mathops.h"
35
36 typedef struct Ir2Context{
37 AVCodecContext *avctx;
38 AVFrame *picture;
39 GetBitContext gb;
40 int decode_delta;
41 } Ir2Context;
42
43 #define CODE_VLC_BITS 14
44 static VLC ir2_vlc;
45
46 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
ir2_get_code(GetBitContext * gb)47 static inline int ir2_get_code(GetBitContext *gb)
48 {
49 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
50 }
51
ir2_decode_plane(Ir2Context * ctx,int width,int height,uint8_t * dst,int pitch,const uint8_t * table)52 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
53 int pitch, const uint8_t *table)
54 {
55 int i;
56 int j;
57 int out = 0;
58
59 if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
60 return AVERROR_INVALIDDATA;
61
62 /* first line contain absolute values, other lines contain deltas */
63 while (out < width) {
64 int c = ir2_get_code(&ctx->gb);
65 if (c >= 0x80) { /* we have a run */
66 c -= 0x7F;
67 if (out + c*2 > width)
68 return AVERROR_INVALIDDATA;
69 for (i = 0; i < c * 2; i++)
70 dst[out++] = 0x80;
71 } else { /* copy two values from table */
72 if (c <= 0)
73 return AVERROR_INVALIDDATA;
74 dst[out++] = table[c * 2];
75 dst[out++] = table[(c * 2) + 1];
76 }
77 }
78 dst += pitch;
79
80 for (j = 1; j < height; j++) {
81 out = 0;
82 while (out < width) {
83 int c;
84 if (get_bits_left(&ctx->gb) <= 0)
85 return AVERROR_INVALIDDATA;
86 c = ir2_get_code(&ctx->gb);
87 if (c >= 0x80) { /* we have a skip */
88 c -= 0x7F;
89 if (out + c*2 > width)
90 return AVERROR_INVALIDDATA;
91 for (i = 0; i < c * 2; i++) {
92 dst[out] = dst[out - pitch];
93 out++;
94 }
95 } else { /* add two deltas from table */
96 int t;
97 if (c <= 0)
98 return AVERROR_INVALIDDATA;
99 t = dst[out - pitch] + (table[c * 2] - 128);
100 t = av_clip_uint8(t);
101 dst[out] = t;
102 out++;
103 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
104 t = av_clip_uint8(t);
105 dst[out] = t;
106 out++;
107 }
108 }
109 dst += pitch;
110 }
111 return 0;
112 }
113
ir2_decode_plane_inter(Ir2Context * ctx,int width,int height,uint8_t * dst,int pitch,const uint8_t * table)114 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
115 int pitch, const uint8_t *table)
116 {
117 int j;
118 int out = 0;
119 int c;
120 int t;
121
122 if (width & 1)
123 return AVERROR_INVALIDDATA;
124
125 for (j = 0; j < height; j++) {
126 out = 0;
127 while (out < width) {
128 if (get_bits_left(&ctx->gb) <= 0)
129 return AVERROR_INVALIDDATA;
130 c = ir2_get_code(&ctx->gb);
131 if (c >= 0x80) { /* we have a skip */
132 c -= 0x7F;
133 out += c * 2;
134 } else { /* add two deltas from table */
135 if (c <= 0)
136 return AVERROR_INVALIDDATA;
137 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
138 t = av_clip_uint8(t);
139 dst[out] = t;
140 out++;
141 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
142 t = av_clip_uint8(t);
143 dst[out] = t;
144 out++;
145 }
146 }
147 dst += pitch;
148 }
149 return 0;
150 }
151
ir2_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)152 static int ir2_decode_frame(AVCodecContext *avctx,
153 void *data, int *got_frame,
154 AVPacket *avpkt)
155 {
156 Ir2Context * const s = avctx->priv_data;
157 const uint8_t *buf = avpkt->data;
158 int buf_size = avpkt->size;
159 AVFrame *picture = data;
160 AVFrame * const p = s->picture;
161 int start, ret;
162 int ltab, ctab;
163
164 if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
165 return ret;
166
167 start = 48; /* hardcoded for now */
168
169 if (start >= buf_size) {
170 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
171 return AVERROR_INVALIDDATA;
172 }
173
174 s->decode_delta = buf[18];
175
176 /* decide whether frame uses deltas or not */
177 #ifndef BITSTREAM_READER_LE
178 for (i = 0; i < buf_size; i++)
179 buf[i] = ff_reverse[buf[i]];
180 #endif
181
182 if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
183 return ret;
184
185 ltab = buf[0x22] & 3;
186 ctab = buf[0x22] >> 2;
187
188 if (ctab > 3) {
189 av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
190 return AVERROR_INVALIDDATA;
191 }
192
193 if (s->decode_delta) { /* intraframe */
194 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
195 p->data[0], p->linesize[0],
196 ir2_delta_table[ltab])) < 0)
197 return ret;
198
199 /* swapped U and V */
200 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
201 p->data[2], p->linesize[2],
202 ir2_delta_table[ctab])) < 0)
203 return ret;
204 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
205 p->data[1], p->linesize[1],
206 ir2_delta_table[ctab])) < 0)
207 return ret;
208 } else { /* interframe */
209 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
210 p->data[0], p->linesize[0],
211 ir2_delta_table[ltab])) < 0)
212 return ret;
213 /* swapped U and V */
214 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
215 p->data[2], p->linesize[2],
216 ir2_delta_table[ctab])) < 0)
217 return ret;
218 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
219 p->data[1], p->linesize[1],
220 ir2_delta_table[ctab])) < 0)
221 return ret;
222 }
223
224 if ((ret = av_frame_ref(picture, p)) < 0)
225 return ret;
226
227 *got_frame = 1;
228
229 return buf_size;
230 }
231
ir2_decode_init(AVCodecContext * avctx)232 static av_cold int ir2_decode_init(AVCodecContext *avctx)
233 {
234 Ir2Context * const ic = avctx->priv_data;
235 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
236
237 ic->avctx = avctx;
238
239 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
240
241 ic->picture = av_frame_alloc();
242 if (!ic->picture)
243 return AVERROR(ENOMEM);
244
245 ir2_vlc.table = vlc_tables;
246 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
247 #ifdef BITSTREAM_READER_LE
248 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
249 &ir2_codes[0][1], 4, 2,
250 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
251 #else
252 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
253 &ir2_codes[0][1], 4, 2,
254 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
255 #endif
256
257 return 0;
258 }
259
ir2_decode_end(AVCodecContext * avctx)260 static av_cold int ir2_decode_end(AVCodecContext *avctx)
261 {
262 Ir2Context * const ic = avctx->priv_data;
263
264 av_frame_free(&ic->picture);
265
266 return 0;
267 }
268
269 AVCodec ff_indeo2_decoder = {
270 .name = "indeo2",
271 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
272 .type = AVMEDIA_TYPE_VIDEO,
273 .id = AV_CODEC_ID_INDEO2,
274 .priv_data_size = sizeof(Ir2Context),
275 .init = ir2_decode_init,
276 .close = ir2_decode_end,
277 .decode = ir2_decode_frame,
278 .capabilities = AV_CODEC_CAP_DR1,
279 };
280