3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of Libav.
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.
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.
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
46 typedef struct LOCOContext {
47 AVCodecContext *avctx;
53 typedef struct RICEContext {
55 int save, run, run2; /* internal rice decoder state */
56 int sum, count; /* sum and count for getting rice parameter */
60 static int loco_get_rice_param(RICEContext *r)
65 while (r->sum > val && cnt < 9) {
73 static inline void loco_update_rice_param(RICEContext *r, int val)
84 static inline int loco_get_rice(RICEContext *r)
87 if (r->run > 0) { /* we have zero run */
89 loco_update_rice_param(r, 0);
92 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
93 loco_update_rice_param(r, (v + 1) >> 1);
96 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
98 r->save += r->run + 1;
104 v = ((v >> 1) + r->lossy) ^ -(v & 1);
117 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
118 static inline int loco_predict(uint8_t* data, int stride, int step)
124 c = data[-stride - step];
126 return mid_pred(a, a + b - c, b);
129 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
130 int stride, const uint8_t *buf, int buf_size, int step)
136 init_get_bits(&rc.gb, buf, buf_size*8);
145 /* restore top left pixel */
146 val = loco_get_rice(&rc);
148 /* restore top line */
149 for (i = 1; i < width; i++) {
150 val = loco_get_rice(&rc);
151 data[i * step] = data[i * step - step] + val;
154 for (j = 1; j < height; j++) {
155 /* restore left column */
156 val = loco_get_rice(&rc);
157 data[0] = data[-stride] + val;
158 /* restore all other pixels */
159 for (i = 1; i < width; i++) {
160 val = loco_get_rice(&rc);
161 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
166 return (get_bits_count(&rc.gb) + 7) >> 3;
169 static int decode_frame(AVCodecContext *avctx,
170 void *data, int *got_frame,
173 LOCOContext * const l = avctx->priv_data;
174 const uint8_t *buf = avpkt->data;
175 int buf_size = avpkt->size;
176 AVFrame * const p = &l->pic;
180 avctx->release_buffer(avctx, p);
183 if ((ret = ff_get_buffer(avctx, p)) < 0) {
184 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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 if (decoded >= buf_size)
195 buf += decoded; buf_size -= decoded;
197 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
198 p->linesize[1], buf, buf_size, 1);
199 if (decoded >= buf_size)
201 buf += decoded; buf_size -= decoded;
203 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
204 p->linesize[2], buf, buf_size, 1);
206 case LOCO_CYV12: case LOCO_YV12:
207 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
208 p->linesize[0], buf, buf_size, 1);
209 if (decoded >= buf_size)
211 buf += decoded; buf_size -= decoded;
213 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
214 p->linesize[2], buf, buf_size, 1);
215 if (decoded >= buf_size)
217 buf += decoded; buf_size -= decoded;
219 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
220 p->linesize[1], buf, buf_size, 1);
222 case LOCO_CRGB: case LOCO_RGB:
223 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
224 -p->linesize[0], buf, buf_size, 3);
225 if (decoded >= buf_size)
227 buf += decoded; buf_size -= decoded;
229 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
230 -p->linesize[0], buf, buf_size, 3);
231 if (decoded >= buf_size)
233 buf += decoded; buf_size -= decoded;
235 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
236 -p->linesize[0], buf, buf_size, 3);
239 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
240 p->linesize[0], buf, buf_size, 4);
241 if (decoded >= buf_size)
243 buf += decoded; buf_size -= decoded;
245 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
246 p->linesize[0], buf, buf_size, 4);
247 if (decoded >= buf_size)
249 buf += decoded; buf_size -= decoded;
251 decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
252 p->linesize[0], buf, buf_size, 4);
253 if (decoded >= buf_size)
255 buf += decoded; buf_size -= decoded;
257 decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
258 p->linesize[0], buf, buf_size, 4);
263 *(AVFrame*)data = l->pic;
267 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
268 return AVERROR(EINVAL);
271 static av_cold int decode_init(AVCodecContext *avctx)
273 LOCOContext * const l = avctx->priv_data;
277 if (avctx->extradata_size < 12) {
278 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
279 avctx->extradata_size);
280 return AVERROR_INVALIDDATA;
282 version = AV_RL32(avctx->extradata);
288 l->lossy = AV_RL32(avctx->extradata + 8);
291 l->lossy = AV_RL32(avctx->extradata + 8);
292 av_log_ask_for_sample(avctx, "This is LOCO codec version %i.\n", version);
295 l->mode = AV_RL32(avctx->extradata + 4);
300 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
304 avctx->pix_fmt = AV_PIX_FMT_BGR24;
308 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
312 avctx->pix_fmt = AV_PIX_FMT_RGB32;
315 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
316 return AVERROR_INVALIDDATA;
318 if (avctx->debug & FF_DEBUG_PICT_INFO)
319 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
324 static av_cold int decode_end(AVCodecContext *avctx)
326 LOCOContext * const l = avctx->priv_data;
327 AVFrame *pic = &l->pic;
330 avctx->release_buffer(avctx, pic);
335 AVCodec ff_loco_decoder = {
337 .type = AVMEDIA_TYPE_VIDEO,
338 .id = AV_CODEC_ID_LOCO,
339 .priv_data_size = sizeof(LOCOContext),
342 .decode = decode_frame,
343 .capabilities = CODEC_CAP_DR1,
344 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),