Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / loco.c
CommitLineData
2ba45a60
DM
1/*
2 * LOCO 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 * LOCO codec.
25 */
26
27#include "avcodec.h"
28#include "get_bits.h"
29#include "golomb.h"
30#include "internal.h"
31#include "mathops.h"
32
33enum LOCO_MODE {
34 LOCO_UNKN = 0,
35 LOCO_CYUY2 = -1,
36 LOCO_CRGB = -2,
37 LOCO_CRGBA = -3,
38 LOCO_CYV12 = -4,
39 LOCO_YUY2 = 1,
40 LOCO_UYVY = 2,
41 LOCO_RGB = 3,
42 LOCO_RGBA = 4,
43 LOCO_YV12 = 5,
44};
45
46typedef struct LOCOContext {
47 AVCodecContext *avctx;
48 int lossy;
49 int mode;
50} LOCOContext;
51
52typedef struct RICEContext {
53 GetBitContext gb;
54 int save, run, run2; /* internal rice decoder state */
55 int sum, count; /* sum and count for getting rice parameter */
56 int lossy;
57} RICEContext;
58
59static int loco_get_rice_param(RICEContext *r)
60{
61 int cnt = 0;
62 int val = r->count;
63
64 while (r->sum > val && cnt < 9) {
65 val <<= 1;
66 cnt++;
67 }
68
69 return cnt;
70}
71
72static inline void loco_update_rice_param(RICEContext *r, int val)
73{
74 r->sum += val;
75 r->count++;
76
77 if (r->count == 16) {
78 r->sum >>= 1;
79 r->count >>= 1;
80 }
81}
82
83static inline int loco_get_rice(RICEContext *r)
84{
85 int v;
86 if (r->run > 0) { /* we have zero run */
87 r->run--;
88 loco_update_rice_param(r, 0);
89 return 0;
90 }
91 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
92 loco_update_rice_param(r, (v + 1) >> 1);
93 if (!v) {
94 if (r->save >= 0) {
95 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
96 if (r->run > 1)
97 r->save += r->run + 1;
98 else
99 r->save -= 3;
100 } else
101 r->run2++;
102 } else {
103 v = ((v >> 1) + r->lossy) ^ -(v & 1);
104 if (r->run2 > 0) {
105 if (r->run2 > 2)
106 r->save += r->run2;
107 else
108 r->save -= 3;
109 r->run2 = 0;
110 }
111 }
112
113 return v;
114}
115
116/* LOCO main predictor - LOCO-I/JPEG-LS predictor */
117static inline int loco_predict(uint8_t* data, int stride, int step)
118{
119 int a, b, c;
120
121 a = data[-stride];
122 b = data[-step];
123 c = data[-stride - step];
124
125 return mid_pred(a, a + b - c, b);
126}
127
128static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
129 int stride, const uint8_t *buf, int buf_size, int step)
130{
131 RICEContext rc;
132 int val;
133 int i, j;
134
135 if(buf_size<=0)
136 return -1;
137
138 init_get_bits8(&rc.gb, buf, buf_size);
139 rc.save = 0;
140 rc.run = 0;
141 rc.run2 = 0;
142 rc.lossy = l->lossy;
143
144 rc.sum = 8;
145 rc.count = 1;
146
147 /* restore top left pixel */
148 val = loco_get_rice(&rc);
149 data[0] = 128 + val;
150 /* restore top line */
151 for (i = 1; i < width; i++) {
152 val = loco_get_rice(&rc);
153 data[i * step] = data[i * step - step] + val;
154 }
155 data += stride;
156 for (j = 1; j < height; j++) {
157 /* restore left column */
158 val = loco_get_rice(&rc);
159 data[0] = data[-stride] + val;
160 /* restore all other pixels */
161 for (i = 1; i < width; i++) {
162 val = loco_get_rice(&rc);
163 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
164 }
165 data += stride;
166 }
167
168 return (get_bits_count(&rc.gb) + 7) >> 3;
169}
170
171static int decode_frame(AVCodecContext *avctx,
172 void *data, int *got_frame,
173 AVPacket *avpkt)
174{
175 LOCOContext * const l = avctx->priv_data;
176 const uint8_t *buf = avpkt->data;
177 int buf_size = avpkt->size;
178 AVFrame * const p = data;
179 int decoded, ret;
180
181 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
182 return ret;
183 p->key_frame = 1;
184
185#define ADVANCE_BY_DECODED do { \
186 if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
187 buf += decoded; buf_size -= decoded; \
188} while(0)
189 switch(l->mode) {
190 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
191 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
192 p->linesize[0], buf, buf_size, 1);
193 ADVANCE_BY_DECODED;
194 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
195 p->linesize[1], buf, buf_size, 1);
196 ADVANCE_BY_DECODED;
197 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
198 p->linesize[2], buf, buf_size, 1);
199 break;
200 case LOCO_CYV12: case LOCO_YV12:
201 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
202 p->linesize[0], buf, buf_size, 1);
203 ADVANCE_BY_DECODED;
204 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
205 p->linesize[2], buf, buf_size, 1);
206 ADVANCE_BY_DECODED;
207 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
208 p->linesize[1], buf, buf_size, 1);
209 break;
210 case LOCO_CRGB: case LOCO_RGB:
211 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
212 -p->linesize[0], buf, buf_size, 3);
213 ADVANCE_BY_DECODED;
214 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
215 -p->linesize[0], buf, buf_size, 3);
216 ADVANCE_BY_DECODED;
217 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
218 -p->linesize[0], buf, buf_size, 3);
219 break;
220 case LOCO_CRGBA:
221 case LOCO_RGBA:
222 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
223 -p->linesize[0], buf, buf_size, 4);
224 ADVANCE_BY_DECODED;
225 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
226 -p->linesize[0], buf, buf_size, 4);
227 ADVANCE_BY_DECODED;
228 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
229 -p->linesize[0], buf, buf_size, 4);
230 ADVANCE_BY_DECODED;
231 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height,
232 -p->linesize[0], buf, buf_size, 4);
233 break;
234 default:
235 av_assert0(0);
236 }
237
238 if (decoded < 0 || decoded > buf_size)
239 goto buf_too_small;
240 buf_size -= decoded;
241
242 *got_frame = 1;
243
244 return avpkt->size - buf_size;
245buf_too_small:
246 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
247 return AVERROR(EINVAL);
248}
249
250static av_cold int decode_init(AVCodecContext *avctx)
251{
252 LOCOContext * const l = avctx->priv_data;
253 int version;
254
255 l->avctx = avctx;
256 if (avctx->extradata_size < 12) {
257 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
258 avctx->extradata_size);
259 return AVERROR_INVALIDDATA;
260 }
261 version = AV_RL32(avctx->extradata);
262 switch (version) {
263 case 1:
264 l->lossy = 0;
265 break;
266 case 2:
267 l->lossy = AV_RL32(avctx->extradata + 8);
268 break;
269 default:
270 l->lossy = AV_RL32(avctx->extradata + 8);
271 avpriv_request_sample(avctx, "LOCO codec version %i", version);
272 }
273
274 l->mode = AV_RL32(avctx->extradata + 4);
275 switch (l->mode) {
276 case LOCO_CYUY2:
277 case LOCO_YUY2:
278 case LOCO_UYVY:
279 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
280 break;
281 case LOCO_CRGB:
282 case LOCO_RGB:
283 avctx->pix_fmt = AV_PIX_FMT_BGR24;
284 break;
285 case LOCO_CYV12:
286 case LOCO_YV12:
287 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
288 break;
289 case LOCO_CRGBA:
290 case LOCO_RGBA:
291 avctx->pix_fmt = AV_PIX_FMT_BGRA;
292 break;
293 default:
294 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
295 return AVERROR_INVALIDDATA;
296 }
297 if (avctx->debug & FF_DEBUG_PICT_INFO)
298 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
299
300 return 0;
301}
302
303AVCodec ff_loco_decoder = {
304 .name = "loco",
305 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
306 .type = AVMEDIA_TYPE_VIDEO,
307 .id = AV_CODEC_ID_LOCO,
308 .priv_data_size = sizeof(LOCOContext),
309 .init = decode_init,
310 .decode = decode_frame,
311 .capabilities = CODEC_CAP_DR1,
312};