* LOCO codec
* Copyright (c) 2005 Konstantin Shishkov
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
+
/**
- * @file loco.c
+ * @file
* LOCO codec.
*/
-
+
#include "avcodec.h"
-#include "common.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "golomb.h"
+#include "mathops.h"
-enum LOCO_MODE {LOCO_UNKN=0, LOCO_CYUY2=-1, LOCO_CRGB=-2, LOCO_CYV12=-3,
+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{
GetBitContext gb;
int save, run, run2; /* internal rice decoder state */
int sum, count; /* sum and count for getting rice parameter */
+ int lossy;
}RICEContext;
-/* could use get_sr_golomb() but is behaves differently on numbers like Rice(2, -64) */
-static inline int get_rice(GetBitContext *gb, int K)
-{
- int i;
- int V = 0;
- for(i = 0; !get_bits1(gb); i++);
- V = i;
- for(i = 0; i < K; i++) V = (V << 1) | get_bits1(gb);
- if(V & 1) return (V + 1) >> 1;
- return -(V >> 1);
-}
-
-static inline int get_u_rice(GetBitContext *gb, int K)
-{
- int i;
- int V = 0;
- for(i = 0; !get_bits1(gb); i++);
- V = i;
- for(i = 0; i < K; i++) V = (V << 1) | get_bits1(gb);
- return V;
-}
-
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)
{
- if (val < 0)
- val = -val;
r->sum += val;
r->count++;
-
+
if(r->count == 16) {
r->sum >>= 1;
r->count >>= 1;
static inline int loco_get_rice(RICEContext *r)
{
int v;
-
if (r->run > 0) { /* we have zero run */
r->run--;
+ loco_update_rice_param(r, 0);
return 0;
}
- v = -get_rice(&r->gb, loco_get_rice_param(r));
+ 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_u_rice(&r->gb, 2);
+ r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
if(r->run > 1)
r->save += r->run + 1;
else
}
else
r->run2++;
- } else if (r->run2 > 0) {
- if (r->run2 > 2)
- r->save += r->run2;
- else
- r->save -= 3;
- r->run2 = 0;
+ } 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 step)
{
- int max_ab, min_ab;
int a, b, c;
-
+
a = data[-stride];
b = data[-step];
c = data[-stride - step];
-
- max_ab = (a > b) ? a : b;
- min_ab = (a < b) ? a : b;
-
- if (c >= max_ab) return min_ab;
- if (c <= min_ab) return max_ab;
- return (a + b - c);
+
+ return mid_pred(a, a + b - c, b);
}
static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
- int stride, uint8_t *buf, int buf_size, int step)
+ int stride, const uint8_t *buf, int buf_size, int step)
{
RICEContext rc;
int val;
int i, j;
-
+
init_get_bits(&rc.gb, buf, buf_size*8);
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);
- loco_update_rice_param(&rc, val);
- if (val < 0) val -= l->lossy;
- if (val > 0) val += l->lossy;
data[0] = 128 + val;
/* restore top line */
for (i = 1; i < width; i++) {
val = loco_get_rice(&rc);
- loco_update_rice_param(&rc, val);
- if (val < 0) val -= l->lossy;
- if (val > 0) val += l->lossy;
data[i * step] = data[i * step - step] + val;
}
data += stride;
for (j = 1; j < height; j++) {
/* restore left column */
val = loco_get_rice(&rc);
- loco_update_rice_param(&rc, val);
- if (val < 0) val -= l->lossy;
- if (val > 0) val += l->lossy;
data[0] = data[-stride] + val;
/* restore all other pixels */
for (i = 1; i < width; i++) {
val = loco_get_rice(&rc);
- loco_update_rice_param(&rc, val);
- if (val < 0) val -= l->lossy;
- if (val > 0) val += l->lossy;
data[i * step] = loco_predict(&data[i * step], stride, step) + val;
}
data += stride;
}
-
- return ((get_bits_count(&rc.gb) + 7) >> 3);
+
+ return (get_bits_count(&rc.gb) + 7) >> 3;
}
-static int decode_frame(AVCodecContext *avctx,
+static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
LOCOContext * const l = avctx->priv_data;
AVFrame * const p= (AVFrame*)&l->pic;
int decoded;
decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
p->linesize[0], buf, buf_size, 1);
buf += decoded; buf_size -= decoded;
- decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
- p->linesize[1], buf, buf_size, 1);
- buf += decoded; buf_size -= decoded;
decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
p->linesize[2], buf, buf_size, 1);
+ buf += decoded; buf_size -= decoded;
+ decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
+ p->linesize[1], buf, buf_size, 1);
break;
case LOCO_CRGB: case LOCO_RGB:
- decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
- p->linesize[0], buf, buf_size, 3);
+ decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
+ -p->linesize[0], buf, buf_size, 3);
buf += decoded; buf_size -= decoded;
- decoded = loco_decode_plane(l, p->data[0] + 1, avctx->width, avctx->height,
- p->linesize[0], buf, buf_size, 3);
+ decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
+ -p->linesize[0], buf, buf_size, 3);
buf += decoded; buf_size -= decoded;
- decoded = loco_decode_plane(l, p->data[0] + 2, avctx->width, avctx->height,
- p->linesize[0], buf, buf_size, 3);
+ decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
+ -p->linesize[0], buf, buf_size, 3);
break;
case LOCO_RGBA:
decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
*data_size = sizeof(AVFrame);
*(AVFrame*)data = l->pic;
-
+
return buf_size;
}
-static int decode_init(AVCodecContext *avctx){
+static av_cold int decode_init(AVCodecContext *avctx){
LOCOContext * const l = avctx->priv_data;
int version;
avctx->extradata_size);
return -1;
}
- version = LE_32(avctx->extradata);
+ version = AV_RL32(avctx->extradata);
switch(version) {
case 1:
l->lossy = 0;
break;
case 2:
- l->lossy = LE_32(avctx->extradata + 8);
+ l->lossy = AV_RL32(avctx->extradata + 8);
break;
default:
- l->lossy = LE_32(avctx->extradata + 8);
- av_log(avctx, AV_LOG_INFO, "This is LOCO codec version %i, please upload file for study\n", version);
+ l->lossy = AV_RL32(avctx->extradata + 8);
+ av_log_ask_for_sample(avctx, "This is LOCO codec version %i.\n", version);
}
-
- l->mode = LE_32(avctx->extradata + 4);
+
+ l->mode = AV_RL32(avctx->extradata + 4);
switch(l->mode) {
case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
avctx->pix_fmt = PIX_FMT_YUV422P;
case LOCO_CYV12: case LOCO_YV12:
avctx->pix_fmt = PIX_FMT_YUV420P;
break;
- case LOCO_RGBA:
- avctx->pix_fmt = PIX_FMT_RGBA32;
+ case LOCO_CRGBA: case LOCO_RGBA:
+ avctx->pix_fmt = PIX_FMT_RGB32;
break;
default:
av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
return -1;
}
+ 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;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx){
+ LOCOContext * const l = avctx->priv_data;
+ AVFrame *pic = &l->pic;
+
+ if (pic->data[0])
+ avctx->release_buffer(avctx, pic);
return 0;
}
-AVCodec loco_decoder = {
- "loco",
- CODEC_TYPE_VIDEO,
- CODEC_ID_LOCO,
- sizeof(LOCOContext),
- decode_init,
- NULL,
- NULL,
- decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_loco_decoder = {
+ .name = "loco",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_LOCO,
+ .priv_data_size = sizeof(LOCOContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
};
projects / ffmpeg / blobdiff