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
46 typedef struct LOCOContext {
47 AVCodecContext *avctx;
52 typedef struct RICEContext {
54 int save, run, run2; /* internal rice decoder state */
55 int sum, count; /* sum and count for getting rice parameter */
59 static int loco_get_rice_param(RICEContext *r)
64 while (r->sum > val && cnt < 9) {
72 static inline void loco_update_rice_param(RICEContext *r, int val)
83 static inline int loco_get_rice(RICEContext *r)
86 if (r->run > 0) { /* we have zero run */
88 loco_update_rice_param(r, 0);
91 if (get_bits_left(&r->gb) < 1)
93 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
94 loco_update_rice_param(r, (v + 1) >> 1);
97 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
99 r->save += r->run + 1;
105 v = ((v >> 1) + r->lossy) ^ -(v & 1);
118 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
119 static inline int loco_predict(uint8_t* data, int stride)
125 c = data[-stride - 1];
127 return mid_pred(a, a + b - c, b);
130 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
131 int stride, const uint8_t *buf, int buf_size)
141 if ((ret = init_get_bits8(&rc.gb, buf, buf_size)) < 0)
152 /* restore top left pixel */
153 val = loco_get_rice(&rc);
155 /* restore top line */
156 for (i = 1; i < width; i++) {
157 val = loco_get_rice(&rc);
159 return AVERROR_INVALIDDATA;
160 data[i] = data[i - 1] + val;
163 for (j = 1; j < height; j++) {
164 /* restore left column */
165 val = loco_get_rice(&rc);
167 return AVERROR_INVALIDDATA;
168 data[0] = data[-stride] + val;
169 /* restore all other pixels */
170 for (i = 1; i < width; i++) {
171 val = loco_get_rice(&rc);
174 data[i] = loco_predict(&data[i], stride) + val;
179 return (get_bits_count(&rc.gb) + 7) >> 3;
182 static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride)
186 for (y=1; y<height; y++) {
188 memmove(data + y*stride,
189 data + y*(stride + 1),
192 memmove(data + y*stride + (width-y),
193 data + (y+1)*stride, y);
198 static int decode_frame(AVCodecContext *avctx,
199 void *data, int *got_frame,
202 LOCOContext * const l = avctx->priv_data;
203 const uint8_t *buf = avpkt->data;
204 int buf_size = avpkt->size;
205 AVFrame * const p = data;
208 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
212 #define ADVANCE_BY_DECODED do { \
213 if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
214 buf += decoded; buf_size -= decoded; \
217 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
218 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
219 p->linesize[0], buf, buf_size);
221 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
222 p->linesize[1], buf, buf_size);
224 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
225 p->linesize[2], buf, buf_size);
227 case LOCO_CYV12: case LOCO_YV12:
228 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
229 p->linesize[0], buf, buf_size);
231 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
232 p->linesize[2], buf, buf_size);
234 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
235 p->linesize[1], buf, buf_size);
237 case LOCO_CRGB: case LOCO_RGB:
238 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
239 -p->linesize[1], buf, buf_size);
241 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
242 -p->linesize[0], buf, buf_size);
244 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
245 -p->linesize[2], buf, buf_size);
246 if (avctx->width & 1) {
247 rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]);
248 rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]);
249 rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]);
254 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
255 -p->linesize[1], buf, buf_size);
257 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
258 -p->linesize[0], buf, buf_size);
260 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
261 -p->linesize[2], buf, buf_size);
263 decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height,
264 -p->linesize[3], buf, buf_size);
270 if (decoded < 0 || decoded > buf_size)
276 return avpkt->size - buf_size;
278 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
279 return AVERROR(EINVAL);
282 static av_cold int decode_init(AVCodecContext *avctx)
284 LOCOContext * const l = avctx->priv_data;
288 if (avctx->extradata_size < 12) {
289 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
290 avctx->extradata_size);
291 return AVERROR_INVALIDDATA;
293 version = AV_RL32(avctx->extradata);
299 l->lossy = AV_RL32(avctx->extradata + 8);
302 l->lossy = AV_RL32(avctx->extradata + 8);
303 avpriv_request_sample(avctx, "LOCO codec version %i", version);
306 if (l->lossy > 65536U) {
307 av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
308 return AVERROR_INVALIDDATA;
311 l->mode = AV_RL32(avctx->extradata + 4);
316 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
320 avctx->pix_fmt = AV_PIX_FMT_GBRP;
324 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
328 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
331 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
332 return AVERROR_INVALIDDATA;
334 if (avctx->debug & FF_DEBUG_PICT_INFO)
335 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
340 AVCodec ff_loco_decoder = {
342 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
343 .type = AVMEDIA_TYPE_VIDEO,
344 .id = AV_CODEC_ID_LOCO,
345 .priv_data_size = sizeof(LOCOContext),
347 .decode = decode_frame,
348 .capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,