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
23 * @file libavcodec/loco.c
28 #include "bitstream.h"
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)
126 init_get_bits(&rc.gb, buf, buf_size*8);
135 /* restore top left pixel */
136 val = loco_get_rice(&rc);
138 /* restore top line */
139 for (i = 1; i < width; i++) {
140 val = loco_get_rice(&rc);
141 data[i * step] = data[i * step - step] + val;
144 for (j = 1; j < height; j++) {
145 /* restore left column */
146 val = loco_get_rice(&rc);
147 data[0] = data[-stride] + val;
148 /* restore all other pixels */
149 for (i = 1; i < width; i++) {
150 val = loco_get_rice(&rc);
151 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
156 return (get_bits_count(&rc.gb) + 7) >> 3;
159 static int decode_frame(AVCodecContext *avctx,
160 void *data, int *data_size,
161 const uint8_t *buf, int buf_size)
163 LOCOContext * const l = avctx->priv_data;
164 AVFrame * const p= (AVFrame*)&l->pic;
168 avctx->release_buffer(avctx, p);
171 if(avctx->get_buffer(avctx, p) < 0){
172 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
178 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
179 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
180 p->linesize[0], buf, buf_size, 1);
181 buf += decoded; buf_size -= decoded;
182 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
183 p->linesize[1], buf, buf_size, 1);
184 buf += decoded; buf_size -= decoded;
185 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
186 p->linesize[2], buf, buf_size, 1);
188 case LOCO_CYV12: case LOCO_YV12:
189 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
190 p->linesize[0], buf, buf_size, 1);
191 buf += decoded; buf_size -= decoded;
192 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
193 p->linesize[2], buf, buf_size, 1);
194 buf += decoded; buf_size -= decoded;
195 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
196 p->linesize[1], buf, buf_size, 1);
198 case LOCO_CRGB: case LOCO_RGB:
199 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
200 -p->linesize[0], buf, buf_size, 3);
201 buf += decoded; buf_size -= decoded;
202 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 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) + 2, avctx->width, avctx->height,
206 -p->linesize[0], buf, buf_size, 3);
209 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
210 p->linesize[0], buf, buf_size, 4);
211 buf += decoded; buf_size -= decoded;
212 decoded = loco_decode_plane(l, p->data[0] + 1, 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] + 2, 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] + 3, avctx->width, avctx->height,
219 p->linesize[0], buf, buf_size, 4);
223 *data_size = sizeof(AVFrame);
224 *(AVFrame*)data = l->pic;
229 static av_cold int decode_init(AVCodecContext *avctx){
230 LOCOContext * const l = avctx->priv_data;
234 if (avctx->extradata_size < 12) {
235 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
236 avctx->extradata_size);
239 version = AV_RL32(avctx->extradata);
245 l->lossy = AV_RL32(avctx->extradata + 8);
248 l->lossy = AV_RL32(avctx->extradata + 8);
249 av_log(avctx, AV_LOG_INFO, "This is LOCO codec version %i, please upload file for study\n", version);
252 l->mode = AV_RL32(avctx->extradata + 4);
254 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
255 avctx->pix_fmt = PIX_FMT_YUV422P;
257 case LOCO_CRGB: case LOCO_RGB:
258 avctx->pix_fmt = PIX_FMT_BGR24;
260 case LOCO_CYV12: case LOCO_YV12:
261 avctx->pix_fmt = PIX_FMT_YUV420P;
263 case LOCO_CRGBA: case LOCO_RGBA:
264 avctx->pix_fmt = PIX_FMT_RGB32;
267 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
270 if(avctx->debug & FF_DEBUG_PICT_INFO)
271 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
276 AVCodec loco_decoder = {
286 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),