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
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)
130 init_get_bits(&rc.gb, buf, buf_size*8);
139 /* restore top left pixel */
140 val = loco_get_rice(&rc);
142 /* restore top line */
143 for (i = 1; i < width; i++) {
144 val = loco_get_rice(&rc);
145 data[i * step] = data[i * step - step] + val;
148 for (j = 1; j < height; j++) {
149 /* restore left column */
150 val = loco_get_rice(&rc);
151 data[0] = data[-stride] + val;
152 /* restore all other pixels */
153 for (i = 1; i < width; i++) {
154 val = loco_get_rice(&rc);
155 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
160 return (get_bits_count(&rc.gb) + 7) >> 3;
163 static int decode_frame(AVCodecContext *avctx,
164 void *data, int *got_frame,
167 const uint8_t *buf = avpkt->data;
168 int buf_size = avpkt->size;
169 LOCOContext * const l = avctx->priv_data;
170 AVFrame * const p = &l->pic;
174 avctx->release_buffer(avctx, p);
177 if(ff_get_buffer(avctx, p) < 0){
178 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
183 #define ADVANCE_BY_DECODED do { \
184 if (decoded < 0) goto stop; \
185 buf += decoded; buf_size -= decoded; \
188 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
189 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
190 p->linesize[0], buf, buf_size, 1);
192 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
193 p->linesize[1], buf, buf_size, 1);
195 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
196 p->linesize[2], buf, buf_size, 1);
198 case LOCO_CYV12: case LOCO_YV12:
199 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
200 p->linesize[0], buf, buf_size, 1);
202 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
203 p->linesize[2], buf, buf_size, 1);
205 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
206 p->linesize[1], buf, buf_size, 1);
208 case LOCO_CRGB: case LOCO_RGB:
209 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
210 -p->linesize[0], buf, buf_size, 3);
212 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
213 -p->linesize[0], buf, buf_size, 3);
215 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
216 -p->linesize[0], buf, buf_size, 3);
218 case LOCO_CRGBA: case LOCO_RGBA:
219 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
220 -p->linesize[0], buf, buf_size, 4);
222 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
223 -p->linesize[0], buf, buf_size, 4);
225 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
226 -p->linesize[0], buf, buf_size, 4);
228 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height,
229 -p->linesize[0], buf, buf_size, 4);
235 *(AVFrame*)data = l->pic;
237 return buf_size < 0 ? -1 : avpkt->size - buf_size;
240 static av_cold int decode_init(AVCodecContext *avctx){
241 LOCOContext * const l = avctx->priv_data;
245 if (avctx->extradata_size < 12) {
246 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
247 avctx->extradata_size);
250 version = AV_RL32(avctx->extradata);
256 l->lossy = AV_RL32(avctx->extradata + 8);
259 l->lossy = AV_RL32(avctx->extradata + 8);
260 av_log_ask_for_sample(avctx, "This is LOCO codec version %i.\n", version);
263 l->mode = AV_RL32(avctx->extradata + 4);
265 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
266 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
268 case LOCO_CRGB: case LOCO_RGB:
269 avctx->pix_fmt = AV_PIX_FMT_BGR24;
271 case LOCO_CYV12: case LOCO_YV12:
272 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
274 case LOCO_CRGBA: case LOCO_RGBA:
275 avctx->pix_fmt = AV_PIX_FMT_RGB32;
278 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
281 if(avctx->debug & FF_DEBUG_PICT_INFO)
282 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
284 avcodec_get_frame_defaults(&l->pic);
289 static av_cold int decode_end(AVCodecContext *avctx){
290 LOCOContext * const l = avctx->priv_data;
291 AVFrame *pic = &l->pic;
294 avctx->release_buffer(avctx, pic);
299 AVCodec ff_loco_decoder = {
301 .type = AVMEDIA_TYPE_VIDEO,
302 .id = AV_CODEC_ID_LOCO,
303 .priv_data_size = sizeof(LOCOContext),
306 .decode = decode_frame,
307 .capabilities = CODEC_CAP_DR1,
308 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),