diff ffmpeg/libavcodec/zmbvenc.c @ 10:6840f77b83aa

commit

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ffmpeg/libavcodec/zmbvenc.c	Sun Apr 21 10:55:35 2013 +0200
@@ -0,0 +1,348 @@
+/*
+ * Zip Motion Blocks Video (ZMBV) encoder
+ * 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
+ * Zip Motion Blocks Video encoder
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#include <zlib.h>
+
+#define ZMBV_KEYFRAME 1
+#define ZMBV_DELTAPAL 2
+
+#define ZMBV_BLOCK 16
+
+/**
+ * Encoder context
+ */
+typedef struct ZmbvEncContext {
+    AVCodecContext *avctx;
+    AVFrame pic;
+
+    int range;
+    uint8_t *comp_buf, *work_buf;
+    uint8_t pal[768];
+    uint32_t pal2[256]; //for quick comparisons
+    uint8_t *prev;
+    int pstride;
+    int comp_size;
+    int keyint, curfrm;
+    z_stream zstream;
+} ZmbvEncContext;
+
+static int score_tab[256];
+
+/** Block comparing function
+ * XXX should be optimized and moved to DSPContext
+ * TODO handle out of edge ME
+ */
+static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2,
+                            int bw, int bh, int *xored)
+{
+    int sum = 0;
+    int i, j;
+    uint8_t histogram[256] = {0};
+
+    *xored = 0;
+    for(j = 0; j < bh; j++){
+        for(i = 0; i < bw; i++){
+            int t = src[i] ^ src2[i];
+            histogram[t]++;
+            *xored |= t;
+        }
+        src += stride;
+        src2 += stride2;
+    }
+
+    for(i = 1; i < 256; i++)
+        sum += score_tab[histogram[i]];
+
+    return sum;
+}
+
+/** Motion estimation function
+ * TODO make better ME decisions
+ */
+static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev,
+                   int pstride, int x, int y, int *mx, int *my, int *xored)
+{
+    int dx, dy, tx, ty, tv, bv, bw, bh;
+
+    *mx = *my = 0;
+    bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
+    bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
+    bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);
+    if(!bv) return 0;
+    for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
+        for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
+            if(tx == x && ty == y) continue; // we already tested this block
+            dx = tx - x;
+            dy = ty - y;
+            tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);
+            if(tv < bv){
+                 bv = tv;
+                 *mx = dx;
+                 *my = dy;
+                 if(!bv) return 0;
+             }
+         }
+    }
+    return bv;
+}
+
+static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                        const AVFrame *pict, int *got_packet)
+{
+    ZmbvEncContext * const c = avctx->priv_data;
+    AVFrame * const p = &c->pic;
+    uint8_t *src, *prev, *buf;
+    uint32_t *palptr;
+    int keyframe, chpal;
+    int fl;
+    int work_size = 0, pkt_size;
+    int bw, bh;
+    int i, j, ret;
+
+    keyframe = !c->curfrm;
+    c->curfrm++;
+    if(c->curfrm == c->keyint)
+        c->curfrm = 0;
+    *p = *pict;
+    p->pict_type= keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
+    p->key_frame= keyframe;
+    chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
+
+    palptr = (uint32_t*)p->data[1];
+    src = p->data[0];
+    prev = c->prev;
+    if(chpal){
+        uint8_t tpal[3];
+        for(i = 0; i < 256; i++){
+            AV_WB24(tpal, palptr[i]);
+            c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
+            c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
+            c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
+            c->pal[i * 3 + 0] = tpal[0];
+            c->pal[i * 3 + 1] = tpal[1];
+            c->pal[i * 3 + 2] = tpal[2];
+        }
+        memcpy(c->pal2, p->data[1], 1024);
+    }
+    if(keyframe){
+        for(i = 0; i < 256; i++){
+            AV_WB24(c->pal+(i*3), palptr[i]);
+        }
+        memcpy(c->work_buf, c->pal, 768);
+        memcpy(c->pal2, p->data[1], 1024);
+        work_size = 768;
+        for(i = 0; i < avctx->height; i++){
+            memcpy(c->work_buf + work_size, src, avctx->width);
+            src += p->linesize[0];
+            work_size += avctx->width;
+        }
+    }else{
+        int x, y, bh2, bw2, xored;
+        uint8_t *tsrc, *tprev;
+        uint8_t *mv;
+        int mx, my;
+
+        bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
+        bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
+        mv = c->work_buf + work_size;
+        memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
+        work_size += (bw * bh * 2 + 3) & ~3;
+        /* for now just XOR'ing */
+        for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
+            bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
+            for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
+                bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
+
+                tsrc = src + x;
+                tprev = prev + x;
+
+                zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
+                mv[0] = (mx << 1) | !!xored;
+                mv[1] = my << 1;
+                tprev += mx + my * c->pstride;
+                if(xored){
+                    for(j = 0; j < bh2; j++){
+                        for(i = 0; i < bw2; i++)
+                            c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
+                        tsrc += p->linesize[0];
+                        tprev += c->pstride;
+                    }
+                }
+            }
+            src += p->linesize[0] * ZMBV_BLOCK;
+            prev += c->pstride * ZMBV_BLOCK;
+        }
+    }
+    /* save the previous frame */
+    src = p->data[0];
+    prev = c->prev;
+    for(i = 0; i < avctx->height; i++){
+        memcpy(prev, src, avctx->width);
+        prev += c->pstride;
+        src += p->linesize[0];
+    }
+
+    if (keyframe)
+        deflateReset(&c->zstream);
+
+    c->zstream.next_in = c->work_buf;
+    c->zstream.avail_in = work_size;
+    c->zstream.total_in = 0;
+
+    c->zstream.next_out = c->comp_buf;
+    c->zstream.avail_out = c->comp_size;
+    c->zstream.total_out = 0;
+    if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){
+        av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
+        return -1;
+    }
+
+    pkt_size = c->zstream.total_out + 1 + 6*keyframe;
+    if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size)) < 0)
+        return ret;
+    buf = pkt->data;
+
+    fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
+    *buf++ = fl;
+    if (keyframe) {
+        *buf++ = 0; // hi ver
+        *buf++ = 1; // lo ver
+        *buf++ = 1; // comp
+        *buf++ = 4; // format - 8bpp
+        *buf++ = ZMBV_BLOCK; // block width
+        *buf++ = ZMBV_BLOCK; // block height
+    }
+    memcpy(buf, c->comp_buf, c->zstream.total_out);
+
+    pkt->flags |= AV_PKT_FLAG_KEY*keyframe;
+    *got_packet = 1;
+
+    return 0;
+}
+
+
+/**
+ * Init zmbv encoder
+ */
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+    ZmbvEncContext * const c = avctx->priv_data;
+    int zret; // Zlib return code
+    int i;
+    int lvl = 9;
+
+    for(i=1; i<256; i++)
+        score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);
+
+    c->avctx = avctx;
+
+    c->curfrm = 0;
+    c->keyint = avctx->keyint_min;
+    c->range = 8;
+    if(avctx->me_range > 0)
+        c->range = FFMIN(avctx->me_range, 127);
+
+    if(avctx->compression_level >= 0)
+        lvl = avctx->compression_level;
+    if(lvl < 0 || lvl > 9){
+        av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
+        return AVERROR(EINVAL);
+    }
+
+    // Needed if zlib unused or init aborted before deflateInit
+    memset(&c->zstream, 0, sizeof(z_stream));
+    c->comp_size = avctx->width * avctx->height + 1024 +
+        ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
+    if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+    /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
+    c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
+                           ((c->comp_size + 63) >> 6) + 11;
+
+    /* Allocate compression buffer */
+    if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
+        return AVERROR(ENOMEM);
+    }
+    c->pstride = FFALIGN(avctx->width, 16);
+    if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    c->zstream.zalloc = Z_NULL;
+    c->zstream.zfree = Z_NULL;
+    c->zstream.opaque = Z_NULL;
+    zret = deflateInit(&c->zstream, lvl);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+        return -1;
+    }
+
+    avctx->coded_frame = &c->pic;
+
+    return 0;
+}
+
+
+
+/**
+ * Uninit zmbv encoder
+ */
+static av_cold int encode_end(AVCodecContext *avctx)
+{
+    ZmbvEncContext * const c = avctx->priv_data;
+
+    av_freep(&c->comp_buf);
+    av_freep(&c->work_buf);
+
+    deflateEnd(&c->zstream);
+    av_freep(&c->prev);
+
+    return 0;
+}
+
+AVCodec ff_zmbv_encoder = {
+    .name           = "zmbv",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_ZMBV,
+    .priv_data_size = sizeof(ZmbvEncContext),
+    .init           = encode_init,
+    .encode2        = encode_frame,
+    .close          = encode_end,
+    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE },
+    .long_name      = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
+};