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FFmpeg/libavcodec/loco.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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