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);
158 data[i] = data[i - 1] + val;
161 for (j = 1; j < height; j++) {
162 /* restore left column */
163 val = loco_get_rice(&rc);
165 return AVERROR_INVALIDDATA;
166 data[0] = data[-stride] + val;
167 /* restore all other pixels */
168 for (i = 1; i < width; i++) {
169 val = loco_get_rice(&rc);
172 data[i] = loco_predict(&data[i], stride) + val;
177 return (get_bits_count(&rc.gb) + 7) >> 3;
180 static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride)
184 for (y=1; y<height; y++) {
186 memmove(data + y*stride,
187 data + y*(stride + 1),
190 memmove(data + y*stride + (width-y),
191 data + (y+1)*stride, y);
196 static int decode_frame(AVCodecContext *avctx,
197 void *data, int *got_frame,
200 LOCOContext * const l = avctx->priv_data;
201 const uint8_t *buf = avpkt->data;
202 int buf_size = avpkt->size;
203 AVFrame * const p = data;
206 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
210 #define ADVANCE_BY_DECODED do { \
211 if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
212 buf += decoded; buf_size -= decoded; \
215 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
216 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
217 p->linesize[0], buf, buf_size);
219 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
220 p->linesize[1], buf, buf_size);
222 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
223 p->linesize[2], buf, buf_size);
225 case LOCO_CYV12: case LOCO_YV12:
226 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
227 p->linesize[0], buf, buf_size);
229 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
230 p->linesize[2], buf, buf_size);
232 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
233 p->linesize[1], buf, buf_size);
235 case LOCO_CRGB: case LOCO_RGB:
236 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
237 -p->linesize[1], buf, buf_size);
239 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
240 -p->linesize[0], buf, buf_size);
242 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
243 -p->linesize[2], buf, buf_size);
244 if (avctx->width & 1) {
245 rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]);
246 rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]);
247 rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]);
252 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
253 -p->linesize[1], buf, buf_size);
255 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
256 -p->linesize[0], buf, buf_size);
258 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
259 -p->linesize[2], buf, buf_size);
261 decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height,
262 -p->linesize[3], buf, buf_size);
268 if (decoded < 0 || decoded > buf_size)
274 return avpkt->size - buf_size;
276 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
277 return AVERROR(EINVAL);
280 static av_cold int decode_init(AVCodecContext *avctx)
282 LOCOContext * const l = avctx->priv_data;
286 if (avctx->extradata_size < 12) {
287 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
288 avctx->extradata_size);
289 return AVERROR_INVALIDDATA;
291 version = AV_RL32(avctx->extradata);
297 l->lossy = AV_RL32(avctx->extradata + 8);
300 l->lossy = AV_RL32(avctx->extradata + 8);
301 avpriv_request_sample(avctx, "LOCO codec version %i", version);
304 if (l->lossy > 65536U) {
305 av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
306 return AVERROR_INVALIDDATA;
309 l->mode = AV_RL32(avctx->extradata + 4);
314 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
318 avctx->pix_fmt = AV_PIX_FMT_GBRP;
322 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
326 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
329 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
330 return AVERROR_INVALIDDATA;
332 if (avctx->debug & FF_DEBUG_PICT_INFO)
333 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
338 AVCodec ff_loco_decoder = {
340 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
341 .type = AVMEDIA_TYPE_VIDEO,
342 .id = AV_CODEC_ID_LOCO,
343 .priv_data_size = sizeof(LOCOContext),
345 .decode = decode_frame,
346 .capabilities = AV_CODEC_CAP_DR1,