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
33 enum LOCO_MODE {LOCO_UNKN=0, LOCO_CYUY2=-1, LOCO_CRGB=-2, LOCO_CRGBA=-3, LOCO_CYV12=-4,
34 LOCO_YUY2=1, LOCO_UYVY=2, LOCO_RGB=3, LOCO_RGBA=4, LOCO_YV12=5};
36 typedef struct LOCOContext{
37 AVCodecContext *avctx;
43 typedef struct RICEContext{
45 int save, run, run2; /* internal rice decoder state */
46 int sum, count; /* sum and count for getting rice parameter */
50 static int loco_get_rice_param(RICEContext *r)
55 while(r->sum > val && cnt < 9) {
63 static inline void loco_update_rice_param(RICEContext *r, int val)
74 static inline int loco_get_rice(RICEContext *r)
77 if (r->run > 0) { /* we have zero run */
79 loco_update_rice_param(r, 0);
82 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
83 loco_update_rice_param(r, (v+1)>>1);
86 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
88 r->save += r->run + 1;
95 v = ((v>>1) + r->lossy) ^ -(v&1);
108 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
109 static inline int loco_predict(uint8_t* data, int stride, int step)
115 c = data[-stride - step];
117 return mid_pred(a, a + b - c, b);
120 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
121 int stride, const uint8_t *buf, int buf_size, int step)
127 init_get_bits(&rc.gb, buf, buf_size*8);
136 /* restore top left pixel */
137 val = loco_get_rice(&rc);
139 /* restore top line */
140 for (i = 1; i < width; i++) {
141 val = loco_get_rice(&rc);
142 data[i * step] = data[i * step - step] + val;
145 for (j = 1; j < height; j++) {
146 /* restore left column */
147 val = loco_get_rice(&rc);
148 data[0] = data[-stride] + val;
149 /* restore all other pixels */
150 for (i = 1; i < width; i++) {
151 val = loco_get_rice(&rc);
152 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
157 return (get_bits_count(&rc.gb) + 7) >> 3;
160 static int decode_frame(AVCodecContext *avctx,
161 void *data, int *data_size,
164 const uint8_t *buf = avpkt->data;
165 int buf_size = avpkt->size;
166 LOCOContext * const l = avctx->priv_data;
167 AVFrame * const p = &l->pic;
171 avctx->release_buffer(avctx, p);
174 if(ff_get_buffer(avctx, p) < 0){
175 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
181 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
182 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
183 p->linesize[0], buf, buf_size, 1);
184 buf += decoded; buf_size -= decoded;
185 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
186 p->linesize[1], buf, buf_size, 1);
187 buf += decoded; buf_size -= decoded;
188 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
189 p->linesize[2], buf, buf_size, 1);
191 case LOCO_CYV12: case LOCO_YV12:
192 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
193 p->linesize[0], buf, buf_size, 1);
194 buf += decoded; buf_size -= decoded;
195 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
196 p->linesize[2], buf, buf_size, 1);
197 buf += decoded; buf_size -= decoded;
198 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
199 p->linesize[1], buf, buf_size, 1);
201 case LOCO_CRGB: case LOCO_RGB:
202 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
203 -p->linesize[0], buf, buf_size, 3);
204 buf += decoded; buf_size -= decoded;
205 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
206 -p->linesize[0], buf, buf_size, 3);
207 buf += decoded; buf_size -= decoded;
208 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
209 -p->linesize[0], buf, buf_size, 3);
212 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
213 p->linesize[0], buf, buf_size, 4);
214 buf += decoded; buf_size -= decoded;
215 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
216 p->linesize[0], buf, buf_size, 4);
217 buf += decoded; buf_size -= decoded;
218 decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
219 p->linesize[0], buf, buf_size, 4);
220 buf += decoded; buf_size -= decoded;
221 decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
222 p->linesize[0], buf, buf_size, 4);
226 *data_size = sizeof(AVFrame);
227 *(AVFrame*)data = l->pic;
232 static av_cold int decode_init(AVCodecContext *avctx){
233 LOCOContext * const l = avctx->priv_data;
237 if (avctx->extradata_size < 12) {
238 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
239 avctx->extradata_size);
242 version = AV_RL32(avctx->extradata);
248 l->lossy = AV_RL32(avctx->extradata + 8);
251 l->lossy = AV_RL32(avctx->extradata + 8);
252 av_log_ask_for_sample(avctx, "This is LOCO codec version %i.\n", version);
255 l->mode = AV_RL32(avctx->extradata + 4);
257 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
258 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
260 case LOCO_CRGB: case LOCO_RGB:
261 avctx->pix_fmt = AV_PIX_FMT_BGR24;
263 case LOCO_CYV12: case LOCO_YV12:
264 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
266 case LOCO_CRGBA: case LOCO_RGBA:
267 avctx->pix_fmt = AV_PIX_FMT_RGB32;
270 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
273 if(avctx->debug & FF_DEBUG_PICT_INFO)
274 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
279 static av_cold int decode_end(AVCodecContext *avctx){
280 LOCOContext * const l = avctx->priv_data;
281 AVFrame *pic = &l->pic;
284 avctx->release_buffer(avctx, pic);
289 AVCodec ff_loco_decoder = {
291 .type = AVMEDIA_TYPE_VIDEO,
292 .id = AV_CODEC_ID_LOCO,
293 .priv_data_size = sizeof(LOCOContext),
296 .decode = decode_frame,
297 .capabilities = CODEC_CAP_DR1,
298 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),