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;
52 typedef struct RICEContext {
54 int save, run, run2; /* internal rice decoder state */
55 int sum, count; /* sum and count for getting rice parameter */
59 static int loco_get_rice_param(RICEContext *r)
64 while (r->sum > val && cnt < 9) {
72 static inline void loco_update_rice_param(RICEContext *r, int val)
83 static inline int loco_get_rice(RICEContext *r)
86 if (r->run > 0) { /* we have zero run */
88 loco_update_rice_param(r, 0);
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);
95 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
97 r->save += r->run + 1;
103 v = ((v >> 1) + r->lossy) ^ -(v & 1);
116 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
117 static inline int loco_predict(uint8_t* data, int stride, int step)
123 c = data[-stride - step];
125 return mid_pred(a, a + b - c, b);
128 static 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)
135 init_get_bits(&rc.gb, buf, buf_size*8);
144 /* restore top left pixel */
145 val = loco_get_rice(&rc);
147 /* restore top line */
148 for (i = 1; i < width; i++) {
149 val = loco_get_rice(&rc);
150 data[i * step] = data[i * step - step] + val;
153 for (j = 1; j < height; j++) {
154 /* restore left column */
155 val = loco_get_rice(&rc);
156 data[0] = data[-stride] + val;
157 /* restore all other pixels */
158 for (i = 1; i < width; i++) {
159 val = loco_get_rice(&rc);
160 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
165 return (get_bits_count(&rc.gb) + 7) >> 3;
168 static int decode_frame(AVCodecContext *avctx,
169 void *data, int *got_frame,
172 LOCOContext * const l = avctx->priv_data;
173 const uint8_t *buf = avpkt->data;
174 int buf_size = avpkt->size;
175 AVFrame * const p = data;
178 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
179 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
185 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
186 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
187 p->linesize[0], buf, buf_size, 1);
188 if (decoded >= buf_size)
190 buf += decoded; buf_size -= decoded;
192 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
193 p->linesize[1], buf, buf_size, 1);
194 if (decoded >= buf_size)
196 buf += decoded; buf_size -= decoded;
198 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
199 p->linesize[2], buf, buf_size, 1);
201 case LOCO_CYV12: case LOCO_YV12:
202 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
203 p->linesize[0], buf, buf_size, 1);
204 if (decoded >= buf_size)
206 buf += decoded; buf_size -= decoded;
208 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
209 p->linesize[2], buf, buf_size, 1);
210 if (decoded >= buf_size)
212 buf += decoded; buf_size -= decoded;
214 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
215 p->linesize[1], buf, buf_size, 1);
217 case LOCO_CRGB: case LOCO_RGB:
218 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
219 -p->linesize[0], buf, buf_size, 3);
220 if (decoded >= buf_size)
222 buf += decoded; buf_size -= decoded;
224 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
225 -p->linesize[0], buf, buf_size, 3);
226 if (decoded >= buf_size)
228 buf += decoded; buf_size -= decoded;
230 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
231 -p->linesize[0], buf, buf_size, 3);
234 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
235 p->linesize[0], buf, buf_size, 4);
236 if (decoded >= buf_size)
238 buf += decoded; buf_size -= decoded;
240 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
241 p->linesize[0], buf, buf_size, 4);
242 if (decoded >= buf_size)
244 buf += decoded; buf_size -= decoded;
246 decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
247 p->linesize[0], buf, buf_size, 4);
248 if (decoded >= buf_size)
250 buf += decoded; buf_size -= decoded;
252 decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
253 p->linesize[0], buf, buf_size, 4);
261 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
262 return AVERROR(EINVAL);
265 static av_cold int decode_init(AVCodecContext *avctx)
267 LOCOContext * const l = avctx->priv_data;
271 if (avctx->extradata_size < 12) {
272 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
273 avctx->extradata_size);
274 return AVERROR_INVALIDDATA;
276 version = AV_RL32(avctx->extradata);
282 l->lossy = AV_RL32(avctx->extradata + 8);
285 l->lossy = AV_RL32(avctx->extradata + 8);
286 avpriv_request_sample(avctx, "LOCO codec version %i", version);
289 l->mode = AV_RL32(avctx->extradata + 4);
294 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
298 avctx->pix_fmt = AV_PIX_FMT_BGR24;
302 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
306 avctx->pix_fmt = AV_PIX_FMT_RGB32;
309 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
310 return AVERROR_INVALIDDATA;
312 if (avctx->debug & FF_DEBUG_PICT_INFO)
313 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
318 AVCodec ff_loco_decoder = {
320 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
321 .type = AVMEDIA_TYPE_VIDEO,
322 .id = AV_CODEC_ID_LOCO,
323 .priv_data_size = sizeof(LOCOContext),
325 .decode = decode_frame,
326 .capabilities = CODEC_CAP_DR1,