3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
32 enum LOCO_MODE {LOCO_UNKN=0, LOCO_CYUY2=-1, LOCO_CRGB=-2, LOCO_CRGBA=-3, LOCO_CYV12=-4,
33 LOCO_YUY2=1, LOCO_UYVY=2, LOCO_RGB=3, LOCO_RGBA=4, LOCO_YV12=5};
35 typedef struct LOCOContext{
36 AVCodecContext *avctx;
42 typedef struct RICEContext{
44 int save, run, run2; /* internal rice decoder state */
45 int sum, count; /* sum and count for getting rice parameter */
49 static int loco_get_rice_param(RICEContext *r)
54 while(r->sum > val && cnt < 9) {
62 static inline void loco_update_rice_param(RICEContext *r, int val)
73 static inline int loco_get_rice(RICEContext *r)
76 if (r->run > 0) { /* we have zero run */
78 loco_update_rice_param(r, 0);
81 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
82 loco_update_rice_param(r, (v+1)>>1);
85 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
87 r->save += r->run + 1;
94 v = ((v>>1) + r->lossy) ^ -(v&1);
107 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
108 static inline int loco_predict(uint8_t* data, int stride, int step)
114 c = data[-stride - step];
116 return mid_pred(a, a + b - c, b);
119 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
120 int stride, const uint8_t *buf, int buf_size, int step)
129 init_get_bits(&rc.gb, buf, buf_size*8);
138 /* restore top left pixel */
139 val = loco_get_rice(&rc);
141 /* restore top line */
142 for (i = 1; i < width; i++) {
143 val = loco_get_rice(&rc);
144 data[i * step] = data[i * step - step] + val;
147 for (j = 1; j < height; j++) {
148 /* restore left column */
149 val = loco_get_rice(&rc);
150 data[0] = data[-stride] + val;
151 /* restore all other pixels */
152 for (i = 1; i < width; i++) {
153 val = loco_get_rice(&rc);
154 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
159 return (get_bits_count(&rc.gb) + 7) >> 3;
162 static int decode_frame(AVCodecContext *avctx,
163 void *data, int *data_size,
166 const uint8_t *buf = avpkt->data;
167 int buf_size = avpkt->size;
168 LOCOContext * const l = avctx->priv_data;
169 AVFrame * const p = &l->pic;
173 avctx->release_buffer(avctx, p);
176 if(avctx->get_buffer(avctx, p) < 0){
177 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
183 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
184 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
185 p->linesize[0], buf, buf_size, 1);
186 buf += decoded; buf_size -= decoded;
187 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
188 p->linesize[1], buf, buf_size, 1);
189 buf += decoded; buf_size -= decoded;
190 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
191 p->linesize[2], buf, buf_size, 1);
193 case LOCO_CYV12: case LOCO_YV12:
194 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
195 p->linesize[0], buf, buf_size, 1);
196 buf += decoded; buf_size -= decoded;
197 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
198 p->linesize[2], buf, buf_size, 1);
199 buf += decoded; buf_size -= decoded;
200 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
201 p->linesize[1], buf, buf_size, 1);
203 case LOCO_CRGB: case LOCO_RGB:
204 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
205 -p->linesize[0], buf, buf_size, 3);
206 buf += decoded; buf_size -= decoded;
207 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
208 -p->linesize[0], buf, buf_size, 3);
209 buf += decoded; buf_size -= decoded;
210 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
211 -p->linesize[0], buf, buf_size, 3);
214 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
215 p->linesize[0], buf, buf_size, 4);
216 buf += decoded; buf_size -= decoded;
217 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
218 p->linesize[0], buf, buf_size, 4);
219 buf += decoded; buf_size -= decoded;
220 decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
221 p->linesize[0], buf, buf_size, 4);
222 buf += decoded; buf_size -= decoded;
223 decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
224 p->linesize[0], buf, buf_size, 4);
228 *data_size = sizeof(AVFrame);
229 *(AVFrame*)data = l->pic;
231 return buf_size < 0 ? -1 : buf_size;
234 static av_cold int decode_init(AVCodecContext *avctx){
235 LOCOContext * const l = avctx->priv_data;
239 if (avctx->extradata_size < 12) {
240 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
241 avctx->extradata_size);
244 version = AV_RL32(avctx->extradata);
250 l->lossy = AV_RL32(avctx->extradata + 8);
253 l->lossy = AV_RL32(avctx->extradata + 8);
254 av_log_ask_for_sample(avctx, "This is LOCO codec version %i.\n", version);
257 l->mode = AV_RL32(avctx->extradata + 4);
259 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
260 avctx->pix_fmt = PIX_FMT_YUV422P;
262 case LOCO_CRGB: case LOCO_RGB:
263 avctx->pix_fmt = PIX_FMT_BGR24;
265 case LOCO_CYV12: case LOCO_YV12:
266 avctx->pix_fmt = PIX_FMT_YUV420P;
268 case LOCO_CRGBA: case LOCO_RGBA:
269 avctx->pix_fmt = PIX_FMT_RGB32;
272 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
275 if(avctx->debug & FF_DEBUG_PICT_INFO)
276 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
278 avcodec_get_frame_defaults(&l->pic);
283 static av_cold int decode_end(AVCodecContext *avctx){
284 LOCOContext * const l = avctx->priv_data;
285 AVFrame *pic = &l->pic;
288 avctx->release_buffer(avctx, pic);
293 AVCodec ff_loco_decoder = {
295 .type = AVMEDIA_TYPE_VIDEO,
297 .priv_data_size = sizeof(LOCOContext),
300 .decode = decode_frame,
301 .capabilities = CODEC_CAP_DR1,
302 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),