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FFmpeg/libavcodec/jpeglsenc.c

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/*
* 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
*/
/**
* @file
* JPEG-LS encoder.
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "encode.h"
#include "get_bits.h"
#include "put_bits.h"
#include "put_golomb.h"
#include "mathops.h"
#include "mjpeg.h"
#include "jpegls.h"
typedef struct JPEGLSContext {
AVClass *class;
int pred;
int comps;
size_t size;
uint8_t *buf;
} JPEGLSContext;
static inline void put_marker_byteu(PutByteContext *pb, enum JpegMarker code)
{
bytestream2_put_byteu(pb, 0xff);
bytestream2_put_byteu(pb, code);
}
/**
* Encode error from regular symbol
*/
static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
int err)
{
int k;
int val;
int map;
for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
;
map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
if (err < 0)
err += state->range;
if (err >= (state->range + 1 >> 1)) {
err -= state->range;
val = 2 * FFABS(err) - 1 - map;
} 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
*/
static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
int RItype, int err, int limit_add)
{
int k;
int val, map;
int Q = 365 + RItype;
int temp;
temp = state->A[Q];
if (RItype)
temp += state->N[Q] >> 1;
for (k = 0; (state->N[Q] << k) < temp; k++)
;
map = 0;
if (!k && err && (2 * state->B[Q] < state->N[Q]))
map = 1;
if (err < 0)
val = -(2 * err) - 1 - RItype + map;
else
val = 2 * err - RItype - map;
set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
if (err < 0)
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
*/
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]])) {
put_bits(pb, 1, 1);
run -= 1 << ff_log2_run[state->run_index[comp]];
if (state->run_index[comp] < 31)
state->run_index[comp]++;
}
/* if hit EOL, encode another full run, else encode aborted run */
if (!trail && run) {
put_bits(pb, 1, 1);
} else if (trail) {
put_bits(pb, 1, 0);
if (ff_log2_run[state->run_index[comp]])
put_bits(pb, ff_log2_run[state->run_index[comp]], run);
}
}
/**
* Encode one line of image
*/
static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
void *tmp, const void *in, int last2, int w,
int stride, int comp, int bits)
{
int x = 0;
int Ra = R(tmp, 0), Rb, Rc = last2, Rd;
int D0, D1, D2;
while (x < w) {
int err, pred, sign;
/* compute gradients */
Rb = R(tmp, x);
Rd = (x >= w - stride) ? R(tmp, x) : R(tmp, x + stride);
D0 = Rd - Rb;
D1 = Rb - Rc;
D2 = Rc - Ra;
/* run mode */
if ((FFABS(D0) <= state->near) &&
(FFABS(D1) <= state->near) &&
(FFABS(D2) <= state->near)) {
int RUNval, RItype, run;
run = 0;
RUNval = Ra;
while (x < w && (FFABS(R(in, x) - RUNval) <= state->near)) {
run++;
W(tmp, x, Ra);
x += stride;
}
ls_encode_run(state, pb, run, comp, x < w);
if (x >= w)
return;
Rb = R(tmp, x);
RItype = FFABS(Ra - Rb) <= state->near;
pred = RItype ? Ra : Rb;
err = R(in, x) - pred;
if (!RItype && Ra > Rb)
err = -err;
if (state->near) {
if (err > 0)
err = (state->near + err) / state->twonear;
else
err = -(state->near - err) / state->twonear;
if (RItype || (Rb >= Ra))
Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
else
Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
} else
Ra = R(in, x);
W(tmp, x, Ra);
if (err < 0)
err += state->range;
if (err >= state->range + 1 >> 1)
err -= state->range;
ls_encode_runterm(state, pb, RItype, err,
ff_log2_run[state->run_index[comp]]);
if (state->run_index[comp] > 0)
state->run_index[comp]--;
} else { /* regular mode */
int context;
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);
if (context < 0) {
context = -context;
sign = 1;
pred = av_clip(pred - state->C[context], 0, state->maxval);
err = pred - R(in, x);
} else {
sign = 0;
pred = av_clip(pred + state->C[context], 0, state->maxval);
err = R(in, x) - pred;
}
if (state->near) {
if (err > 0)
err = (state->near + err) / state->twonear;
else
err = -(state->near - err) / state->twonear;
if (!sign)
Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
else
Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
} else
Ra = R(in, x);
W(tmp, x, Ra);
ls_encode_regular(state, pb, context, err);
}
Rc = Rb;
x += stride;
}
}
static void ls_store_lse(JLSState *state, PutByteContext *pb)
{
/* Test if we have default params and don't need to store LSE */
JLSState state2 = { 0 };
state2.bpp = state->bpp;
state2.near = state->near;
ff_jpegls_reset_coding_parameters(&state2, 1);
if (state->T1 == state2.T1 &&
state->T2 == state2.T2 &&
state->T3 == state2.T3 &&
state->reset == state2.reset)
return;
/* store LSE type 1 */
put_marker_byteu(pb, LSE);
bytestream2_put_be16u(pb, 13);
bytestream2_put_byteu(pb, 1);
bytestream2_put_be16u(pb, state->maxval);
bytestream2_put_be16u(pb, state->T1);
bytestream2_put_be16u(pb, state->T2);
bytestream2_put_be16u(pb, state->T3);
bytestream2_put_be16u(pb, state->reset);
}
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static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
JPEGLSContext *ctx = avctx->priv_data;
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const AVFrame *const p = pict;
PutByteContext pb;
PutBitContext pb2;
GetBitContext gb;
const uint8_t *in;
uint8_t *last = NULL;
JLSState state = { 0 };
size_t size;
int i, ret, size_in_bits;
int comps;
last = av_mallocz(FFABS(p->linesize[0]));
if (!last)
return AVERROR(ENOMEM);
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init_put_bits(&pb2, ctx->buf, ctx->size);
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comps = ctx->comps;
/* initialize JPEG-LS state from JPEG parameters */
state.near = ctx->pred;
state.bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
ff_jpegls_reset_coding_parameters(&state, 0);
ff_jpegls_init_state(&state);
in = p->data[0];
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
int t = 0;
for (i = 0; i < avctx->height; i++) {
int last0 = last[0];
ls_encode_line(&state, &pb2, last, in, t, avctx->width, 1, 0, 8);
t = last0;
in += p->linesize[0];
}
} else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
int t = 0;
for (i = 0; i < avctx->height; i++) {
int last0 = *((uint16_t *)last);
ls_encode_line(&state, &pb2, last, in, t, avctx->width, 1, 0, 16);
t = last0;
in += p->linesize[0];
}
} else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
int j, width;
int Rc[3] = { 0, 0, 0 };
width = avctx->width * 3;
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < 3; j++) {
int last0 = last[j];
ls_encode_line(&state, &pb2, last + j, in + j, Rc[j],
width, 3, j, 8);
Rc[j] = last0;
}
in += p->linesize[0];
}
} else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
int j, width;
int Rc[3] = { 0, 0, 0 };
width = avctx->width * 3;
for (i = 0; i < avctx->height; i++) {
for (j = 2; j >= 0; j--) {
int last0 = last[j];
ls_encode_line(&state, &pb2, last + j, in + j, Rc[j],
width, 3, j, 8);
Rc[j] = last0;
}
in += p->linesize[0];
}
}
av_free(last);
/* Now the actual image data has been written, which enables us to estimate
* the needed packet size: For every 15 input bits, an escape bit might be
* added below; and if put_bits_count % 15 is >= 8, then another bit might
* be added.
* Furthermore 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. This also simplifies the size calculation:
* Properly rounding up is now automatically baked-in. */
put_bits(&pb2, 7, 0);
/* Make sure that the bit count + padding is representable in an int;
necessary for put_bits_count() as well as for using a GetBitContext. */
if (put_bytes_count(&pb2, 0) > INT_MAX / 8 - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(ERANGE);
size_in_bits = put_bits_count(&pb2);
flush_put_bits(&pb2);
size = size_in_bits * 2U / 15;
size += 2 + 2 + 2 + 1 + 2 + 2 + 1 + comps * (1 + 1 + 1) + 2 + 2 + 1
+ comps * (1 + 1) + 1 + 1 + 1; /* Header */
size += 2 + 2 + 1 + 2 + 2 + 2 + 2 + 2; /* LSE */
size += 2; /* EOI */
if ((ret = ff_get_encode_buffer(avctx, pkt, size, 0)) < 0)
return ret;
bytestream2_init_writer(&pb, pkt->data, pkt->size);
/* write our own JPEG header, can't use mjpeg_picture_header */
put_marker_byteu(&pb, SOI);
put_marker_byteu(&pb, SOF48);
bytestream2_put_be16u(&pb, 8 + comps * 3); // header size depends on components
bytestream2_put_byteu(&pb, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
bytestream2_put_be16u(&pb, avctx->height);
bytestream2_put_be16u(&pb, avctx->width);
bytestream2_put_byteu(&pb, comps); // components
for (i = 1; i <= comps; i++) {
bytestream2_put_byteu(&pb, i); // component ID
bytestream2_put_byteu(&pb, 0x11); // subsampling: none
bytestream2_put_byteu(&pb, 0); // Tiq, used by JPEG-LS ext
}
put_marker_byteu(&pb, SOS);
bytestream2_put_be16u(&pb, 6 + comps * 2);
bytestream2_put_byteu(&pb, comps);
for (i = 1; i <= comps; i++) {
bytestream2_put_byteu(&pb, i); // component ID
bytestream2_put_byteu(&pb, 0); // mapping index: none
}
bytestream2_put_byteu(&pb, ctx->pred);
bytestream2_put_byteu(&pb, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
bytestream2_put_byteu(&pb, 0); // point transform: none
ls_store_lse(&state, &pb);
/* do escape coding */
init_get_bits(&gb, pb2.buf, size_in_bits);
size_in_bits -= 7;
while (get_bits_count(&gb) < size_in_bits) {
int v;
v = get_bits(&gb, 8);
bytestream2_put_byteu(&pb, v);
if (v == 0xFF) {
v = get_bits(&gb, 7);
bytestream2_put_byteu(&pb, v);
}
}
/* End of image */
put_marker_byteu(&pb, EOI);
av_shrink_packet(pkt, bytestream2_tell_p(&pb));
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*got_packet = 1;
return 0;
}
static av_cold int encode_jpegls_init(AVCodecContext *avctx)
{
JPEGLSContext *ctx = avctx->priv_data;
size_t size;
if ((avctx->width | avctx->height) > UINT16_MAX) {
av_log(avctx, AV_LOG_ERROR, "Dimensions exceeding 65535x65535\n");
return AVERROR(EINVAL);
}
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
avctx->pix_fmt == AV_PIX_FMT_GRAY16)
ctx->comps = 1;
else
ctx->comps = 3;
size = AV_INPUT_BUFFER_MIN_SIZE;
/* INT_MAX due to PutBit-API. */
if (avctx->width * (unsigned)avctx->height > (INT_MAX - size) / 4 / ctx->comps)
return AVERROR(ERANGE);
size += 4 * ctx->comps * avctx->width * avctx->height;
ctx->size = size;
ctx->buf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!ctx->buf)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int encode_jpegls_close(AVCodecContext *avctx)
{
JPEGLSContext *ctx = avctx->priv_data;
av_freep(&ctx->buf);
return 0;
}
#define OFFSET(x) offsetof(JPEGLSContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "pred" },
{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
{ "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
{ "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
{ NULL},
};
static const AVClass jpegls_class = {
.class_name = "jpegls",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_jpegls_encoder = {
.p.name = "jpegls",
.p.long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_JPEGLS,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.priv_data_size = sizeof(JPEGLSContext),
.p.priv_class = &jpegls_class,
.init = encode_jpegls_init,
FF_CODEC_ENCODE_CB(encode_picture_ls),
.close = encode_jpegls_close,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
},
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};