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
30 #include "bitstream.h"
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, 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,
162 uint8_t *buf, int buf_size)
164 LOCOContext * const l = avctx->priv_data;
165 AVFrame * const p= (AVFrame*)&l->pic;
169 avctx->release_buffer(avctx, p);
172 if(avctx->get_buffer(avctx, p) < 0){
173 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
179 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
180 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
181 p->linesize[0], buf, buf_size, 1);
182 buf += decoded; buf_size -= decoded;
183 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
184 p->linesize[1], buf, buf_size, 1);
185 buf += decoded; buf_size -= decoded;
186 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
187 p->linesize[2], buf, buf_size, 1);
189 case LOCO_CYV12: case LOCO_YV12:
190 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
191 p->linesize[0], buf, buf_size, 1);
192 buf += decoded; buf_size -= decoded;
193 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
194 p->linesize[2], buf, buf_size, 1);
195 buf += decoded; buf_size -= decoded;
196 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
197 p->linesize[1], buf, buf_size, 1);
199 case LOCO_CRGB: case LOCO_RGB:
200 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
201 -p->linesize[0], buf, buf_size, 3);
202 buf += decoded; buf_size -= decoded;
203 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
204 -p->linesize[0], buf, buf_size, 3);
205 buf += decoded; buf_size -= decoded;
206 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
207 -p->linesize[0], buf, buf_size, 3);
210 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
211 p->linesize[0], buf, buf_size, 4);
212 buf += decoded; buf_size -= decoded;
213 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
214 p->linesize[0], buf, buf_size, 4);
215 buf += decoded; buf_size -= decoded;
216 decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
217 p->linesize[0], buf, buf_size, 4);
218 buf += decoded; buf_size -= decoded;
219 decoded = loco_decode_plane(l, p->data[0] + 3, avctx->width, avctx->height,
220 p->linesize[0], buf, buf_size, 4);
224 *data_size = sizeof(AVFrame);
225 *(AVFrame*)data = l->pic;
230 static int decode_init(AVCodecContext *avctx){
231 LOCOContext * const l = avctx->priv_data;
235 if (avctx->extradata_size < 12) {
236 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
237 avctx->extradata_size);
240 version = AV_RL32(avctx->extradata);
246 l->lossy = AV_RL32(avctx->extradata + 8);
249 l->lossy = AV_RL32(avctx->extradata + 8);
250 av_log(avctx, AV_LOG_INFO, "This is LOCO codec version %i, please upload file for study\n", version);
253 l->mode = AV_RL32(avctx->extradata + 4);
255 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
256 avctx->pix_fmt = PIX_FMT_YUV422P;
258 case LOCO_CRGB: case LOCO_RGB:
259 avctx->pix_fmt = PIX_FMT_BGR24;
261 case LOCO_CYV12: case LOCO_YV12:
262 avctx->pix_fmt = PIX_FMT_YUV420P;
264 case LOCO_CRGBA: case LOCO_RGBA:
265 avctx->pix_fmt = PIX_FMT_RGB32;
268 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
271 if(avctx->debug & FF_DEBUG_PICT_INFO)
272 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
277 AVCodec loco_decoder = {