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
28 #include "bitstream.h"
31 enum LOCO_MODE {LOCO_UNKN=0, LOCO_CYUY2=-1, LOCO_CRGB=-2, LOCO_CRGBA=-3, LOCO_CYV12=-4,
32 LOCO_YUY2=1, LOCO_UYVY=2, LOCO_RGB=3, LOCO_RGBA=4, LOCO_YV12=5};
34 typedef struct LOCOContext{
35 AVCodecContext *avctx;
41 typedef struct RICEContext{
43 int save, run, run2; /* internal rice decoder state */
44 int sum, count; /* sum and count for getting rice parameter */
48 static int loco_get_rice_param(RICEContext *r)
53 while(r->sum > val && cnt < 9) {
61 static inline void loco_update_rice_param(RICEContext *r, int val)
72 static inline int loco_get_rice(RICEContext *r)
75 if (r->run > 0) { /* we have zero run */
77 loco_update_rice_param(r, 0);
80 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
81 loco_update_rice_param(r, (v+1)>>1);
84 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
86 r->save += r->run + 1;
93 v = ((v>>1) + r->lossy) ^ -(v&1);
106 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
107 static inline int loco_predict(uint8_t* data, int stride, int step)
113 c = data[-stride - step];
115 return mid_pred(a, a + b - c, b);
118 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
119 int stride, const uint8_t *buf, int buf_size, int step)
125 init_get_bits(&rc.gb, buf, buf_size*8);
134 /* restore top left pixel */
135 val = loco_get_rice(&rc);
137 /* restore top line */
138 for (i = 1; i < width; i++) {
139 val = loco_get_rice(&rc);
140 data[i * step] = data[i * step - step] + val;
143 for (j = 1; j < height; j++) {
144 /* restore left column */
145 val = loco_get_rice(&rc);
146 data[0] = data[-stride] + val;
147 /* restore all other pixels */
148 for (i = 1; i < width; i++) {
149 val = loco_get_rice(&rc);
150 data[i * step] = loco_predict(&data[i * step], stride, step) + val;
155 return ((get_bits_count(&rc.gb) + 7) >> 3);
158 static int decode_frame(AVCodecContext *avctx,
159 void *data, int *data_size,
160 const uint8_t *buf, int buf_size)
162 LOCOContext * const l = avctx->priv_data;
163 AVFrame * const p= (AVFrame*)&l->pic;
167 avctx->release_buffer(avctx, p);
170 if(avctx->get_buffer(avctx, p) < 0){
171 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
177 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
178 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
179 p->linesize[0], buf, buf_size, 1);
180 buf += decoded; buf_size -= decoded;
181 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
182 p->linesize[1], buf, buf_size, 1);
183 buf += decoded; buf_size -= decoded;
184 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
185 p->linesize[2], buf, buf_size, 1);
187 case LOCO_CYV12: case LOCO_YV12:
188 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
189 p->linesize[0], buf, buf_size, 1);
190 buf += decoded; buf_size -= decoded;
191 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
192 p->linesize[2], buf, buf_size, 1);
193 buf += decoded; buf_size -= decoded;
194 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
195 p->linesize[1], buf, buf_size, 1);
197 case LOCO_CRGB: case LOCO_RGB:
198 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
199 -p->linesize[0], buf, buf_size, 3);
200 buf += decoded; buf_size -= decoded;
201 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
202 -p->linesize[0], buf, buf_size, 3);
203 buf += decoded; buf_size -= decoded;
204 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
205 -p->linesize[0], buf, buf_size, 3);
208 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
209 p->linesize[0], buf, buf_size, 4);
210 buf += decoded; buf_size -= decoded;
211 decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
212 p->linesize[0], buf, buf_size, 4);
213 buf += decoded; buf_size -= decoded;
214 decoded = loco_decode_plane(l, p->data[0] + 2, 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] + 3, avctx->width, avctx->height,
218 p->linesize[0], buf, buf_size, 4);
222 *data_size = sizeof(AVFrame);
223 *(AVFrame*)data = l->pic;
228 static int decode_init(AVCodecContext *avctx){
229 LOCOContext * const l = avctx->priv_data;
233 if (avctx->extradata_size < 12) {
234 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
235 avctx->extradata_size);
238 version = AV_RL32(avctx->extradata);
244 l->lossy = AV_RL32(avctx->extradata + 8);
247 l->lossy = AV_RL32(avctx->extradata + 8);
248 av_log(avctx, AV_LOG_INFO, "This is LOCO codec version %i, please upload file for study\n", version);
251 l->mode = AV_RL32(avctx->extradata + 4);
253 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
254 avctx->pix_fmt = PIX_FMT_YUV422P;
256 case LOCO_CRGB: case LOCO_RGB:
257 avctx->pix_fmt = PIX_FMT_BGR24;
259 case LOCO_CYV12: case LOCO_YV12:
260 avctx->pix_fmt = PIX_FMT_YUV420P;
262 case LOCO_CRGBA: case LOCO_RGBA:
263 avctx->pix_fmt = PIX_FMT_RGB32;
266 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
269 if(avctx->debug & FF_DEBUG_PICT_INFO)
270 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
275 AVCodec loco_decoder = {