split jpeg_ls into jpeglsdec, jpeglsenc and jpegls

Originally committed as revision 9021 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 392 insertions, 0 deletions

diff --git a/libavcodec/jpeglsenc.c b/libavcodec/jpeglsenc.c
new file mode 100644
index 0000000000..d8e8bda763
--- /dev/null
+++ b/libavcodec/jpeglsenc.c
@@ -0,0 +1,392 @@
+/*
+ * 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 jpeglsenc.c
+ * JPEG-LS encoder.
+ */
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "golomb.h"
+#include "mjpeg.h"
+#include "jpegls.h"
+
+
+/**
+ * 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 *last, void *cur, int last2, int w, int stride, int comp, int bits){
+    int x = 0;
+    int Ra, Rb, Rc, Rd;
+    int D0, D1, D2;
+
+    while(x < w) {
+        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 */
+        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(cur, x) - RUNval) <= state->near)){
+                run++;
+                W(cur, x, Ra);
+                x += stride;
+            }
+            ls_encode_run(state, pb, run, comp, x < w);
+            if(x >= w)
+                return;
+            Rb = R(last, x);
+            RItype = (FFABS(Ra - Rb) <= state->near);
+            pred = RItype ? Ra : Rb;
+            err = R(cur, 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);
+                W(cur, 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(cur, x);
+            }else{
+                sign = 0;
+                pred = av_clip(pred + state->C[context], 0, state->maxval);
+                err = R(cur, 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);
+                W(cur, x, Ra);
+            }
+
+            ls_encode_regular(state, pb, context, err);
+        }
+        x += stride;
+    }
+}
+
+static void ls_store_lse(JLSState *state, PutBitContext *pb){
+    /* Test if we have default params and don't need to store LSE */
+    JLSState state2;
+    memset(&state2, 0, sizeof(JLSState));
+    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(pb, LSE);
+    put_bits(pb, 16, 13);
+    put_bits(pb, 8,   1);
+    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);
+}
+
+static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+    JpeglsContext * const s = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    const int near = avctx->prediction_method;
+    PutBitContext pb, pb2;
+    GetBitContext gb;
+    uint8_t *buf2, *zero, *cur, *last;
+    JLSState *state;
+    int i, size;
+    int comps;
+
+    buf2 = av_malloc(buf_size);
+
+    init_put_bits(&pb, buf, buf_size);
+    init_put_bits(&pb2, buf2, buf_size);
+
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
+        comps = 1;
+    else
+        comps = 3;
+
+    /* 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
+    put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
+    put_bits(&pb, 16, avctx->height);
+    put_bits(&pb, 16, avctx->width);
+    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
+    }
+
+    put_marker(&pb, SOS);
+    put_bits(&pb, 16, 6 + comps * 2);
+    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
+    }
+    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
+
+    state = av_mallocz(sizeof(JLSState));
+    /* initialize JPEG-LS state from JPEG parameters */
+    state->near = near;
+    state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
+    ff_jpegls_reset_coding_parameters(state, 0);
+    ff_jpegls_init_state(state);
+
+    ls_store_lse(state, &pb);
+
+    zero = av_mallocz(p->linesize[0]);
+    last = zero;
+    cur = p->data[0];
+    if(avctx->pix_fmt == PIX_FMT_GRAY8){
+        int t = 0;
+
+        for(i = 0; i < avctx->height; i++) {
+            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
+            t = last[0];
+            last = cur;
+            cur += p->linesize[0];
+        }
+    }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
+        int t = 0;
+
+        for(i = 0; i < avctx->height; i++) {
+            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
+            t = *((uint16_t*)last);
+            last = cur;
+            cur += p->linesize[0];
+        }
+    }else if(avctx->pix_fmt == 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++) {
+                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
+                Rc[j] = last[j];
+            }
+            last = cur;
+            cur += s->picture.linesize[0];
+        }
+    }else if(avctx->pix_fmt == 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--) {
+                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
+                Rc[j] = last[j];
+            }
+            last = cur;
+            cur += s->picture.linesize[0];
+        }
+    }
+
+    av_free(zero);
+    av_free(state);
+
+    // 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.
+    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;
+    while(get_bits_count(&gb) < size){
+        int v;
+        v = get_bits(&gb, 8);
+        put_bits(&pb, 8, v);
+        if(v == 0xFF){
+            v = get_bits(&gb, 7);
+            put_bits(&pb, 8, v);
+        }
+    }
+    align_put_bits(&pb);
+    av_free(buf2);
+
+    /* End of image */
+    put_marker(&pb, EOI);
+    flush_put_bits(&pb);
+
+    emms_c();
+
+    return put_bits_count(&pb) >> 3;
+}
+
+static int encode_init_ls(AVCodecContext *ctx) {
+    JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
+
+    c->avctx = ctx;
+    ctx->coded_frame = &c->picture;
+
+    if(ctx->pix_fmt != PIX_FMT_GRAY8 && ctx->pix_fmt != PIX_FMT_GRAY16 && ctx->pix_fmt != PIX_FMT_RGB24 && ctx->pix_fmt != PIX_FMT_BGR24){
+        av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
+        return -1;
+    }
+    return 0;
+}
+
+AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
+    "jpegls",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_JPEGLS,
+    sizeof(JpeglsContext),
+    encode_init_ls,
+    encode_picture_ls,
+    NULL,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, -1},
+};