7b355f39b98cfb75ffacf3f018685fd06638b158
[libav.git] / libavcodec / indeo2.c
1 /*
2 * Intel Indeo 2 codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 #define BITSTREAM_READER_LE
28 #include "libavutil/attributes.h"
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "indeo2data.h"
32 #include "internal.h"
33 #include "mathops.h"
34
35 typedef struct Ir2Context{
36 AVCodecContext *avctx;
37 AVFrame *picture;
38 GetBitContext gb;
39 int decode_delta;
40 } Ir2Context;
41
42 #define CODE_VLC_BITS 14
43 static VLC ir2_vlc;
44
45 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
46 static inline int ir2_get_code(GetBitContext *gb)
47 {
48 return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
49 }
50
51 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
52 int pitch, const uint8_t *table)
53 {
54 int i;
55 int j;
56 int out = 0;
57 int c;
58 int t;
59
60 if (width & 1)
61 return AVERROR_INVALIDDATA;
62
63 /* first line contain absolute values, other lines contain deltas */
64 while (out < width) {
65 c = ir2_get_code(&ctx->gb);
66 if (c >= 0x80) { /* we have a run */
67 c -= 0x7F;
68 if (out + c*2 > width)
69 return AVERROR_INVALIDDATA;
70 for (i = 0; i < c * 2; i++)
71 dst[out++] = 0x80;
72 } else { /* copy two values from table */
73 dst[out++] = table[c * 2];
74 dst[out++] = table[(c * 2) + 1];
75 }
76 }
77 dst += pitch;
78
79 for (j = 1; j < height; j++) {
80 out = 0;
81 while (out < width) {
82 c = ir2_get_code(&ctx->gb);
83 if (c >= 0x80) { /* we have a skip */
84 c -= 0x7F;
85 if (out + c*2 > width)
86 return AVERROR_INVALIDDATA;
87 for (i = 0; i < c * 2; i++) {
88 dst[out] = dst[out - pitch];
89 out++;
90 }
91 } else { /* add two deltas from table */
92 t = dst[out - pitch] + (table[c * 2] - 128);
93 t = av_clip_uint8(t);
94 dst[out] = t;
95 out++;
96 t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
97 t = av_clip_uint8(t);
98 dst[out] = t;
99 out++;
100 }
101 }
102 dst += pitch;
103 }
104 return 0;
105 }
106
107 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
108 int pitch, const uint8_t *table)
109 {
110 int j;
111 int out = 0;
112 int c;
113 int t;
114
115 if (width & 1)
116 return AVERROR_INVALIDDATA;
117
118 for (j = 0; j < height; j++) {
119 out = 0;
120 while (out < width) {
121 c = ir2_get_code(&ctx->gb);
122 if (c >= 0x80) { /* we have a skip */
123 c -= 0x7F;
124 out += c * 2;
125 } else { /* add two deltas from table */
126 t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
127 t = av_clip_uint8(t);
128 dst[out] = t;
129 out++;
130 t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
131 t = av_clip_uint8(t);
132 dst[out] = t;
133 out++;
134 }
135 }
136 dst += pitch;
137 }
138 return 0;
139 }
140
141 static int ir2_decode_frame(AVCodecContext *avctx,
142 void *data, int *got_frame,
143 AVPacket *avpkt)
144 {
145 Ir2Context * const s = avctx->priv_data;
146 const uint8_t *buf = avpkt->data;
147 int buf_size = avpkt->size;
148 AVFrame *picture = data;
149 AVFrame * const p = s->picture;
150 int start, ret;
151
152 if ((ret = ff_reget_buffer(avctx, p)) < 0) {
153 av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
154 return ret;
155 }
156
157 start = 48; /* hardcoded for now */
158
159 if (start >= buf_size) {
160 av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
161 return AVERROR_INVALIDDATA;
162 }
163
164 s->decode_delta = buf[18];
165
166 /* decide whether frame uses deltas or not */
167 #ifndef BITSTREAM_READER_LE
168 for (i = 0; i < buf_size; i++)
169 buf[i] = ff_reverse[buf[i]];
170 #endif
171
172 init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
173
174 if (s->decode_delta) { /* intraframe */
175 if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
176 p->data[0], p->linesize[0],
177 ir2_luma_table)) < 0)
178 return ret;
179
180 /* swapped U and V */
181 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
182 p->data[2], p->linesize[2],
183 ir2_luma_table)) < 0)
184 return ret;
185 if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
186 p->data[1], p->linesize[1],
187 ir2_luma_table)) < 0)
188 return ret;
189 } else { /* interframe */
190 if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
191 p->data[0], p->linesize[0],
192 ir2_luma_table)) < 0)
193 return ret;
194 /* swapped U and V */
195 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
196 p->data[2], p->linesize[2],
197 ir2_luma_table)) < 0)
198 return ret;
199 if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
200 p->data[1], p->linesize[1],
201 ir2_luma_table)) < 0)
202 return ret;
203 }
204
205 if ((ret = av_frame_ref(picture, p)) < 0)
206 return ret;
207
208 *got_frame = 1;
209
210 return buf_size;
211 }
212
213 static av_cold int ir2_decode_init(AVCodecContext *avctx)
214 {
215 Ir2Context * const ic = avctx->priv_data;
216 static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
217
218 ic->avctx = avctx;
219
220 avctx->pix_fmt= AV_PIX_FMT_YUV410P;
221
222 ic->picture = av_frame_alloc();
223 if (!ic->picture)
224 return AVERROR(ENOMEM);
225
226 ir2_vlc.table = vlc_tables;
227 ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
228 #ifdef BITSTREAM_READER_LE
229 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
230 &ir2_codes[0][1], 4, 2,
231 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
232 #else
233 init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
234 &ir2_codes[0][1], 4, 2,
235 &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
236 #endif
237
238 return 0;
239 }
240
241 static av_cold int ir2_decode_end(AVCodecContext *avctx)
242 {
243 Ir2Context * const ic = avctx->priv_data;
244
245 av_frame_free(&ic->picture);
246
247 return 0;
248 }
249
250 AVCodec ff_indeo2_decoder = {
251 .name = "indeo2",
252 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
253 .type = AVMEDIA_TYPE_VIDEO,
254 .id = AV_CODEC_ID_INDEO2,
255 .priv_data_size = sizeof(Ir2Context),
256 .init = ir2_decode_init,
257 .close = ir2_decode_end,
258 .decode = ir2_decode_frame,
259 .capabilities = AV_CODEC_CAP_DR1,
260 };