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 "codec_internal.h"
47 typedef struct LOCOContext {
48 AVCodecContext *avctx;
53 typedef struct RICEContext {
55 int save, run, run2; /* internal rice decoder state */
56 int sum, count; /* sum and count for getting rice parameter */
60 static int loco_get_rice_param(RICEContext *r)
65 while (r->sum > val && cnt < 9) {
73 static inline void loco_update_rice_param(RICEContext *r, int val)
84 static inline int loco_get_rice(RICEContext *r)
87 if (r->run > 0) { /* we have zero run */
89 loco_update_rice_param(r, 0);
92 if (get_bits_left(&r->gb) < 1)
94 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
95 loco_update_rice_param(r, (v + 1) >> 1);
98 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
100 r->save += r->run + 1;
106 v = ((v >> 1) + r->lossy) ^ -(v & 1);
119 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
120 static inline int loco_predict(uint8_t* data, int stride)
126 c = data[-stride - 1];
128 return mid_pred(a, a + b - c, b);
131 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
132 int stride, const uint8_t *buf, int buf_size)
142 if ((ret = init_get_bits8(&rc.gb, buf, buf_size)) < 0)
153 /* restore top left pixel */
154 val = loco_get_rice(&rc);
156 /* restore top line */
157 for (i = 1; i < width; i++) {
158 val = loco_get_rice(&rc);
160 return AVERROR_INVALIDDATA;
161 data[i] = data[i - 1] + val;
164 for (j = 1; j < height; j++) {
165 /* restore left column */
166 val = loco_get_rice(&rc);
168 return AVERROR_INVALIDDATA;
169 data[0] = data[-stride] + val;
170 /* restore all other pixels */
171 for (i = 1; i < width; i++) {
172 val = loco_get_rice(&rc);
175 data[i] = loco_predict(&data[i], stride) + val;
180 return (get_bits_count(&rc.gb) + 7) >> 3;
183 static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride)
187 for (y=1; y<height; y++) {
189 memmove(data + y*stride,
190 data + y*(stride + 1),
193 memmove(data + y*stride + (width-y),
194 data + (y+1)*stride, y);
199 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
200 int *got_frame, AVPacket *avpkt)
202 LOCOContext * const l = avctx->priv_data;
203 const uint8_t *buf = avpkt->data;
204 int buf_size = avpkt->size;
207 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
209 p->flags |= AV_FRAME_FLAG_KEY;
211 #define ADVANCE_BY_DECODED do { \
212 if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
213 buf += decoded; buf_size -= decoded; \
216 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
217 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
218 p->linesize[0], buf, buf_size);
220 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
221 p->linesize[1], buf, buf_size);
223 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
224 p->linesize[2], buf, buf_size);
226 case LOCO_CYV12: case LOCO_YV12:
227 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
228 p->linesize[0], buf, buf_size);
230 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
231 p->linesize[2], buf, buf_size);
233 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
234 p->linesize[1], buf, buf_size);
236 case LOCO_CRGB: case LOCO_RGB:
237 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
238 -p->linesize[1], buf, buf_size);
240 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
241 -p->linesize[0], buf, buf_size);
243 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
244 -p->linesize[2], buf, buf_size);
245 if (avctx->width & 1) {
246 rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]);
247 rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]);
248 rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]);
253 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
254 -p->linesize[1], buf, buf_size);
256 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
257 -p->linesize[0], buf, buf_size);
259 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
260 -p->linesize[2], buf, buf_size);
262 decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height,
263 -p->linesize[3], buf, buf_size);
269 if (decoded < 0 || decoded > buf_size)
275 return avpkt->size - buf_size;
277 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
278 return AVERROR(EINVAL);
281 static av_cold int decode_init(AVCodecContext *avctx)
283 LOCOContext * const l = avctx->priv_data;
287 if (avctx->extradata_size < 12) {
288 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
289 avctx->extradata_size);
290 return AVERROR_INVALIDDATA;
292 version = AV_RL32(avctx->extradata);
298 l->lossy = AV_RL32(avctx->extradata + 8);
301 l->lossy = AV_RL32(avctx->extradata + 8);
302 avpriv_request_sample(avctx, "LOCO codec version %i", version);
305 if (l->lossy > 65536U) {
306 av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
307 return AVERROR_INVALIDDATA;
310 l->mode = AV_RL32(avctx->extradata + 4);
315 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
319 avctx->pix_fmt = AV_PIX_FMT_GBRP;
323 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
327 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
330 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
331 return AVERROR_INVALIDDATA;
333 if (avctx->debug & FF_DEBUG_PICT_INFO)
334 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
339 const FFCodec ff_loco_decoder = {
341 CODEC_LONG_NAME("LOCO"),
342 .p.type = AVMEDIA_TYPE_VIDEO,
343 .p.id = AV_CODEC_ID_LOCO,
344 .priv_data_size = sizeof(LOCOContext),
346 FF_CODEC_DECODE_CB(decode_frame),
347 .p.capabilities = AV_CODEC_CAP_DR1,