6ba04c2b |
/*
* JPEG-LS encoder
* Copyright (c) 2003 Michael Niedermayer
* Copyright (c) 2006 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
*/
/** |
ba87f080 |
* @file |
6ba04c2b |
* JPEG-LS encoder.
*/
#include "avcodec.h" |
9106a698 |
#include "get_bits.h" |
a2dd988b |
#include "put_bits.h" |
6ba04c2b |
#include "golomb.h" |
6d9c27dc |
#include "internal.h" |
199436b9 |
#include "mathops.h" |
6ba04c2b |
#include "mjpeg.h"
#include "jpegls.h"
/**
* Encode error from regular symbol
*/ |
ff4fc5ef |
static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
int err)
{ |
6ba04c2b |
int k;
int val;
int map;
|
ff4fc5ef |
for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
; |
6ba04c2b |
map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
|
ff4fc5ef |
if (err < 0) |
6ba04c2b |
err += state->range; |
9cacdabd |
if (err >= (state->range + 1 >> 1)) { |
6ba04c2b |
err -= state->range; |
ff4fc5ef |
val = 2 * FFABS(err) - 1 - map; |
6ba04c2b |
} else
val = 2 * err + map;
set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
ff_jpegls_update_state_regular(state, Q, err);
}
/**
* Encode error from run termination
*/ |
ff4fc5ef |
static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
int RItype, int err, int limit_add)
{ |
6ba04c2b |
int k;
int val, map;
int Q = 365 + RItype;
int temp;
temp = state->A[Q]; |
ff4fc5ef |
if (RItype) |
6ba04c2b |
temp += state->N[Q] >> 1; |
ff4fc5ef |
for (k = 0; (state->N[Q] << k) < temp; k++)
; |
6ba04c2b |
map = 0; |
ff4fc5ef |
if (!k && err && (2 * state->B[Q] < state->N[Q])) |
6ba04c2b |
map = 1;
|
ff4fc5ef |
if (err < 0)
val = -(2 * err) - 1 - RItype + map; |
6ba04c2b |
else
val = 2 * err - RItype - map;
set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
|
ff4fc5ef |
if (err < 0) |
6ba04c2b |
state->B[Q]++;
state->A[Q] += (val + 1 - RItype) >> 1;
ff_jpegls_downscale_state(state, Q);
}
/**
* Encode run value as specified by JPEG-LS standard
*/ |
ff4fc5ef |
static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
int comp, int trail)
{
while (run >= (1 << ff_log2_run[state->run_index[comp]])) { |
6ba04c2b |
put_bits(pb, 1, 1);
run -= 1 << ff_log2_run[state->run_index[comp]]; |
ff4fc5ef |
if (state->run_index[comp] < 31) |
6ba04c2b |
state->run_index[comp]++;
}
/* if hit EOL, encode another full run, else encode aborted run */ |
ff4fc5ef |
if (!trail && run) { |
6ba04c2b |
put_bits(pb, 1, 1); |
ff4fc5ef |
} else if (trail) { |
6ba04c2b |
put_bits(pb, 1, 0); |
ff4fc5ef |
if (ff_log2_run[state->run_index[comp]]) |
6ba04c2b |
put_bits(pb, ff_log2_run[state->run_index[comp]], run);
}
}
/**
* Encode one line of image
*/ |
ff4fc5ef |
static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
void *last, void *cur, int last2, int w,
int stride, int comp, int bits)
{ |
6ba04c2b |
int x = 0;
int Ra, Rb, Rc, Rd;
int D0, D1, D2;
|
ff4fc5ef |
while (x < w) { |
6ba04c2b |
int err, pred, sign;
/* compute gradients */
Ra = x ? R(cur, x - stride) : R(last, x);
Rb = R(last, x);
Rc = x ? R(last, x - stride) : last2;
Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
D0 = Rd - Rb;
D1 = Rb - Rc;
D2 = Rc - Ra;
/* run mode */ |
ff4fc5ef |
if ((FFABS(D0) <= state->near) &&
(FFABS(D1) <= state->near) &&
(FFABS(D2) <= state->near)) { |
6ba04c2b |
int RUNval, RItype, run;
|
ff4fc5ef |
run = 0; |
6ba04c2b |
RUNval = Ra; |
ff4fc5ef |
while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) { |
6ba04c2b |
run++;
W(cur, x, Ra);
x += stride;
}
ls_encode_run(state, pb, run, comp, x < w); |
ff4fc5ef |
if (x >= w) |
6ba04c2b |
return; |
ff4fc5ef |
Rb = R(last, x); |
9cacdabd |
RItype = FFABS(Ra - Rb) <= state->near; |
ff4fc5ef |
pred = RItype ? Ra : Rb;
err = R(cur, x) - pred; |
6ba04c2b |
|
ff4fc5ef |
if (!RItype && Ra > Rb) |
6ba04c2b |
err = -err;
|
ff4fc5ef |
if (state->near) {
if (err > 0)
err = (state->near + err) / state->twonear; |
6ba04c2b |
else
err = -(state->near - err) / state->twonear;
|
ff4fc5ef |
if (RItype || (Rb >= Ra)) |
6ba04c2b |
Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
else
Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
W(cur, x, Ra);
} |
ff4fc5ef |
if (err < 0) |
6ba04c2b |
err += state->range; |
9cacdabd |
if (err >= state->range + 1 >> 1) |
6ba04c2b |
err -= state->range;
|
ff4fc5ef |
ls_encode_runterm(state, pb, RItype, err,
ff_log2_run[state->run_index[comp]]); |
6ba04c2b |
|
ff4fc5ef |
if (state->run_index[comp] > 0) |
6ba04c2b |
state->run_index[comp]--;
} else { /* regular mode */
int context;
|
ff4fc5ef |
context = ff_jpegls_quantize(state, D0) * 81 +
ff_jpegls_quantize(state, D1) * 9 +
ff_jpegls_quantize(state, D2);
pred = mid_pred(Ra, Ra + Rb - Rc, Rb); |
6ba04c2b |
|
ff4fc5ef |
if (context < 0) { |
6ba04c2b |
context = -context; |
ff4fc5ef |
sign = 1;
pred = av_clip(pred - state->C[context], 0, state->maxval);
err = pred - R(cur, x);
} else { |
6ba04c2b |
sign = 0;
pred = av_clip(pred + state->C[context], 0, state->maxval); |
ff4fc5ef |
err = R(cur, x) - pred; |
6ba04c2b |
}
|
ff4fc5ef |
if (state->near) {
if (err > 0)
err = (state->near + err) / state->twonear; |
6ba04c2b |
else
err = -(state->near - err) / state->twonear; |
ff4fc5ef |
if (!sign) |
6ba04c2b |
Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
else
Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
W(cur, x, Ra);
}
ls_encode_regular(state, pb, context, err);
}
x += stride;
}
}
|
ff4fc5ef |
static void ls_store_lse(JLSState *state, PutBitContext *pb)
{ |
6ba04c2b |
/* Test if we have default params and don't need to store LSE */ |
a92be9b8 |
JLSState state2 = { 0 }; |
ff4fc5ef |
state2.bpp = state->bpp; |
6ba04c2b |
state2.near = state->near;
ff_jpegls_reset_coding_parameters(&state2, 1); |
ff4fc5ef |
if (state->T1 == state2.T1 &&
state->T2 == state2.T2 &&
state->T3 == state2.T3 &&
state->reset == state2.reset) |
6ba04c2b |
return;
/* store LSE type 1 */
put_marker(pb, LSE);
put_bits(pb, 16, 13); |
ff4fc5ef |
put_bits(pb, 8, 1); |
6ba04c2b |
put_bits(pb, 16, state->maxval);
put_bits(pb, 16, state->T1);
put_bits(pb, 16, state->T2);
put_bits(pb, 16, state->T3);
put_bits(pb, 16, state->reset);
}
|
6d9c27dc |
static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{ |
706a9292 |
const AVFrame *const p = pict; |
ff4fc5ef |
const int near = avctx->prediction_method; |
6ba04c2b |
PutBitContext pb, pb2;
GetBitContext gb;
uint8_t *buf2, *zero, *cur, *last;
JLSState *state; |
6d9c27dc |
int i, size, ret; |
6ba04c2b |
int comps;
|
ff4fc5ef |
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
avctx->pix_fmt == AV_PIX_FMT_GRAY16) |
6ba04c2b |
comps = 1;
else
comps = 3;
|
39354d60 |
if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
FF_MIN_BUFFER_SIZE)) < 0) |
6d9c27dc |
return ret;
buf2 = av_malloc(pkt->size);
init_put_bits(&pb, pkt->data, pkt->size);
init_put_bits(&pb2, buf2, pkt->size);
|
6ba04c2b |
/* write our own JPEG header, can't use mjpeg_picture_header */
put_marker(&pb, SOI);
put_marker(&pb, SOF48);
put_bits(&pb, 16, 8 + comps * 3); // header size depends on components |
ff4fc5ef |
put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp |
6ba04c2b |
put_bits(&pb, 16, avctx->height);
put_bits(&pb, 16, avctx->width); |
ff4fc5ef |
put_bits(&pb, 8, comps); // components
for (i = 1; i <= comps; i++) {
put_bits(&pb, 8, i); // component ID
put_bits(&pb, 8, 0x11); // subsampling: none
put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext |
6ba04c2b |
}
put_marker(&pb, SOS);
put_bits(&pb, 16, 6 + comps * 2); |
ff4fc5ef |
put_bits(&pb, 8, comps);
for (i = 1; i <= comps; i++) {
put_bits(&pb, 8, i); // component ID
put_bits(&pb, 8, 0); // mapping index: none |
6ba04c2b |
} |
ff4fc5ef |
put_bits(&pb, 8, near);
put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
put_bits(&pb, 8, 0); // point transform: none |
6ba04c2b |
state = av_mallocz(sizeof(JLSState));
/* initialize JPEG-LS state from JPEG parameters */
state->near = near; |
ff4fc5ef |
state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8; |
6ba04c2b |
ff_jpegls_reset_coding_parameters(state, 0);
ff_jpegls_init_state(state);
ls_store_lse(state, &pb);
|
0ca15aa0 |
zero = av_mallocz(FFABS(p->linesize[0])); |
34bbab43 |
if (!zero) {
av_free(state); |
0ca15aa0 |
return AVERROR(ENOMEM); |
34bbab43 |
} |
6ba04c2b |
last = zero; |
ff4fc5ef |
cur = p->data[0];
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { |
6ba04c2b |
int t = 0;
|
ff4fc5ef |
for (i = 0; i < avctx->height; i++) {
ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
t = last[0]; |
6ba04c2b |
last = cur;
cur += p->linesize[0];
} |
ff4fc5ef |
} else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) { |
6ba04c2b |
int t = 0;
|
ff4fc5ef |
for (i = 0; i < avctx->height; i++) { |
6ba04c2b |
ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16); |
ff4fc5ef |
t = *((uint16_t *)last); |
6ba04c2b |
last = cur;
cur += p->linesize[0];
} |
ff4fc5ef |
} else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { |
6ba04c2b |
int j, width; |
ff4fc5ef |
int Rc[3] = { 0, 0, 0 }; |
6ba04c2b |
width = avctx->width * 3; |
ff4fc5ef |
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < 3; j++) {
ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
width, 3, j, 8); |
6ba04c2b |
Rc[j] = last[j];
}
last = cur; |
706a9292 |
cur += p->linesize[0]; |
6ba04c2b |
} |
ff4fc5ef |
} else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) { |
6ba04c2b |
int j, width; |
ff4fc5ef |
int Rc[3] = { 0, 0, 0 }; |
6ba04c2b |
width = avctx->width * 3; |
ff4fc5ef |
for (i = 0; i < avctx->height; i++) {
for (j = 2; j >= 0; j--) {
ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
width, 3, j, 8); |
6ba04c2b |
Rc[j] = last[j];
}
last = cur; |
706a9292 |
cur += p->linesize[0]; |
6ba04c2b |
}
}
|
b96d1859 |
av_freep(&zero);
av_freep(&state); |
6ba04c2b |
|
ff4fc5ef |
/* the specification says that after doing 0xff escaping unused bits in
* the last byte must be set to 0, so just append 7 "optional" zero-bits
* to avoid special-casing. */ |
6ba04c2b |
put_bits(&pb2, 7, 0);
size = put_bits_count(&pb2);
flush_put_bits(&pb2);
/* do escape coding */
init_get_bits(&gb, buf2, size);
size -= 7; |
ff4fc5ef |
while (get_bits_count(&gb) < size) { |
6ba04c2b |
int v;
v = get_bits(&gb, 8);
put_bits(&pb, 8, v); |
ff4fc5ef |
if (v == 0xFF) { |
6ba04c2b |
v = get_bits(&gb, 7);
put_bits(&pb, 8, v);
}
} |
9f51c682 |
avpriv_align_put_bits(&pb); |
6ba04c2b |
av_free(buf2);
/* End of image */
put_marker(&pb, EOI);
flush_put_bits(&pb);
emms_c();
|
6d9c27dc |
pkt->size = put_bits_count(&pb) >> 3;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0; |
6ba04c2b |
}
|
706a9292 |
static av_cold int encode_close(AVCodecContext *avctx)
{
av_frame_free(&avctx->coded_frame);
return 0;
}
|
ff4fc5ef |
static av_cold int encode_init_ls(AVCodecContext *ctx)
{ |
706a9292 |
ctx->coded_frame = av_frame_alloc();
if (!ctx->coded_frame)
return AVERROR(ENOMEM); |
6ba04c2b |
|
706a9292 |
ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
ctx->coded_frame->key_frame = 1; |
6ba04c2b |
|
ff4fc5ef |
if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
ctx->pix_fmt != AV_PIX_FMT_BGR24) {
av_log(ctx, AV_LOG_ERROR,
"Only grayscale and RGB24/BGR24 images are supported\n"); |
6ba04c2b |
return -1;
}
return 0;
}
|
02c2a54b |
AVCodec ff_jpegls_encoder = { |
86714887 |
.name = "jpegls", |
ff4fc5ef |
.long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"), |
86714887 |
.type = AVMEDIA_TYPE_VIDEO, |
36ef5369 |
.id = AV_CODEC_ID_JPEGLS, |
86714887 |
.init = encode_init_ls, |
706a9292 |
.close = encode_close, |
6d9c27dc |
.encode2 = encode_picture_ls, |
ff4fc5ef |
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16, |
716d413c |
AV_PIX_FMT_NONE |
00c3b67b |
}, |
6ba04c2b |
}; |