350 lines
10 KiB
C
350 lines
10 KiB
C
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/*
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* LOCO codec
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* Copyright (c) 2005 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* LOCO codec.
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "internal.h"
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#include "mathops.h"
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enum LOCO_MODE {
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LOCO_UNKN = 0,
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LOCO_CYUY2 = -1,
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LOCO_CRGB = -2,
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LOCO_CRGBA = -3,
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LOCO_CYV12 = -4,
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LOCO_YUY2 = 1,
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LOCO_UYVY = 2,
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LOCO_RGB = 3,
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LOCO_RGBA = 4,
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LOCO_YV12 = 5,
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};
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typedef struct LOCOContext {
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AVCodecContext *avctx;
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int lossy;
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enum LOCO_MODE mode;
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} LOCOContext;
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typedef struct RICEContext {
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GetBitContext gb;
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int save, run, run2; /* internal rice decoder state */
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int sum, count; /* sum and count for getting rice parameter */
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int lossy;
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} RICEContext;
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static int loco_get_rice_param(RICEContext *r)
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{
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int cnt = 0;
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int val = r->count;
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while (r->sum > val && cnt < 9) {
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val <<= 1;
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cnt++;
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}
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return cnt;
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}
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static inline void loco_update_rice_param(RICEContext *r, int val)
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{
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r->sum += val;
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r->count++;
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if (r->count == 16) {
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r->sum >>= 1;
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r->count >>= 1;
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}
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}
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static inline int loco_get_rice(RICEContext *r)
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{
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unsigned v;
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if (r->run > 0) { /* we have zero run */
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r->run--;
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loco_update_rice_param(r, 0);
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return 0;
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}
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if (get_bits_left(&r->gb) < 1)
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return INT_MIN;
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v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
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loco_update_rice_param(r, (v + 1) >> 1);
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if (!v) {
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if (r->save >= 0) {
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r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
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if (r->run > 1)
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r->save += r->run + 1;
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else
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r->save -= 3;
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} else
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r->run2++;
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} else {
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v = ((v >> 1) + r->lossy) ^ -(v & 1);
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if (r->run2 > 0) {
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if (r->run2 > 2)
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r->save += r->run2;
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else
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r->save -= 3;
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r->run2 = 0;
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}
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}
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return v;
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}
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/* LOCO main predictor - LOCO-I/JPEG-LS predictor */
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static inline int loco_predict(uint8_t* data, int stride)
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{
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int a, b, c;
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a = data[-stride];
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b = data[-1];
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c = data[-stride - 1];
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return mid_pred(a, a + b - c, b);
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}
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static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
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int stride, const uint8_t *buf, int buf_size)
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{
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RICEContext rc;
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unsigned val;
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int ret;
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int i, j;
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if(buf_size<=0)
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return -1;
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if ((ret = init_get_bits8(&rc.gb, buf, buf_size)) < 0)
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return ret;
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rc.save = 0;
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rc.run = 0;
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rc.run2 = 0;
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rc.lossy = l->lossy;
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rc.sum = 8;
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rc.count = 1;
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/* restore top left pixel */
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val = loco_get_rice(&rc);
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data[0] = 128 + val;
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/* restore top line */
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for (i = 1; i < width; i++) {
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val = loco_get_rice(&rc);
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if (val == INT_MIN)
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return AVERROR_INVALIDDATA;
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data[i] = data[i - 1] + val;
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}
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data += stride;
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for (j = 1; j < height; j++) {
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/* restore left column */
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val = loco_get_rice(&rc);
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if (val == INT_MIN)
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return AVERROR_INVALIDDATA;
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data[0] = data[-stride] + val;
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/* restore all other pixels */
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for (i = 1; i < width; i++) {
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val = loco_get_rice(&rc);
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if (val == INT_MIN)
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return -1;
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data[i] = loco_predict(&data[i], stride) + val;
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}
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data += stride;
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}
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return (get_bits_count(&rc.gb) + 7) >> 3;
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}
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static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride)
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{
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int y;
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for (y=1; y<height; y++) {
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if (width>=y) {
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memmove(data + y*stride,
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data + y*(stride + 1),
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(width-y));
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if (y+1 < height)
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memmove(data + y*stride + (width-y),
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data + (y+1)*stride, y);
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}
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}
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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LOCOContext * const l = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVFrame * const p = data;
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int decoded, ret;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->key_frame = 1;
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#define ADVANCE_BY_DECODED do { \
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if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
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buf += decoded; buf_size -= decoded; \
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} while(0)
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switch(l->mode) {
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case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
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decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
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p->linesize[0], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
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p->linesize[1], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
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p->linesize[2], buf, buf_size);
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break;
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case LOCO_CYV12: case LOCO_YV12:
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decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
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p->linesize[0], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
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p->linesize[2], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
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p->linesize[1], buf, buf_size);
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break;
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case LOCO_CRGB: case LOCO_RGB:
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decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[1], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[0], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[2], buf, buf_size);
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if (avctx->width & 1) {
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rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]);
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rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]);
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rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]);
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}
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break;
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case LOCO_CRGBA:
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case LOCO_RGBA:
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decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[1], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[0], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[2], buf, buf_size);
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ADVANCE_BY_DECODED;
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decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height,
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-p->linesize[3], buf, buf_size);
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break;
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default:
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av_assert0(0);
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}
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if (decoded < 0 || decoded > buf_size)
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goto buf_too_small;
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buf_size -= decoded;
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*got_frame = 1;
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return avpkt->size - buf_size;
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buf_too_small:
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av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
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return AVERROR(EINVAL);
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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LOCOContext * const l = avctx->priv_data;
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int version;
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l->avctx = avctx;
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if (avctx->extradata_size < 12) {
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av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
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avctx->extradata_size);
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return AVERROR_INVALIDDATA;
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}
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version = AV_RL32(avctx->extradata);
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switch (version) {
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case 1:
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l->lossy = 0;
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break;
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case 2:
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l->lossy = AV_RL32(avctx->extradata + 8);
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break;
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default:
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l->lossy = AV_RL32(avctx->extradata + 8);
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avpriv_request_sample(avctx, "LOCO codec version %i", version);
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}
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if (l->lossy > 65536U) {
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av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
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return AVERROR_INVALIDDATA;
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}
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l->mode = AV_RL32(avctx->extradata + 4);
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switch (l->mode) {
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case LOCO_CYUY2:
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case LOCO_YUY2:
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case LOCO_UYVY:
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avctx->pix_fmt = AV_PIX_FMT_YUV422P;
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break;
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case LOCO_CRGB:
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case LOCO_RGB:
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avctx->pix_fmt = AV_PIX_FMT_GBRP;
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break;
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case LOCO_CYV12:
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case LOCO_YV12:
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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break;
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case LOCO_CRGBA:
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case LOCO_RGBA:
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avctx->pix_fmt = AV_PIX_FMT_GBRAP;
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break;
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default:
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av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
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return AVERROR_INVALIDDATA;
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}
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if (avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
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return 0;
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}
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AVCodec ff_loco_decoder = {
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.name = "loco",
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.long_name = NULL_IF_CONFIG_SMALL("LOCO"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_LOCO,
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.priv_data_size = sizeof(LOCOContext),
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.init = decode_init,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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