Fix for older version of zlib

Originally committed as revision 2695 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/lcl.c

+/*
+ * LCL (LossLess Codec Library) Codec
+ * Copyright (c) 2002-2004 Roberto Togni
+ *
+ * This library 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.
+ *
+ * This library 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
+ *
+ */
+
+/**
+ * @file lcl.c
+ * LCL (LossLess Codec Library) Video Codec
+ * Decoder for MSZH and ZLIB codecs
+ * Experimental encoder for ZLIB RGB24
+ *
+ * Fourcc: MSZH, ZLIB
+ *
+ * Original Win32 dll:
+ * Ver2.23 By Kenji Oshima 2000.09.20
+ * avimszh.dll, avizlib.dll
+ *
+ * A description of the decoding algorithm can be found here:
+ *   http://www.pcisys.net/~melanson/codecs
+ *
+ * Supports: BGR24 (RGB 24bpp)
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
+
+#define BMPTYPE_YUV 1
+#define BMPTYPE_RGB 2
+
+#define IMGTYPE_YUV111 0
+#define IMGTYPE_YUV422 1
+#define IMGTYPE_RGB24 2
+#define IMGTYPE_YUV411 3
+#define IMGTYPE_YUV211 4
+#define IMGTYPE_YUV420 5
+
+#define COMP_MSZH 0
+#define COMP_MSZH_NOCOMP 1
+#define COMP_ZLIB_HISPEED 1
+#define COMP_ZLIB_HICOMP 9
+#define COMP_ZLIB_NORMAL -1
+
+#define FLAG_MULTITHREAD 1
+#define FLAG_NULLFRAME 2
+#define FLAG_PNGFILTER 4
+#define FLAGMASK_UNUSED 0xf8
+
+#define CODEC_MSZH 1
+#define CODEC_ZLIB 3
+
+#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
+#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
+
+/*
+ * Decoder context
+ */
+typedef struct LclContext {
+
+	AVCodecContext *avctx;
+	AVFrame pic;
+    PutBitContext pb;
+
+    // Image type
+    int imgtype;
+    // Compression type
+    int compression;
+    // Flags
+    int flags;
+    // Decompressed data size
+    unsigned int decomp_size;
+    // Decompression buffer
+    unsigned char* decomp_buf;
+    // Maximum compressed data size
+    unsigned int max_comp_size;
+    // Compression buffer
+    unsigned char* comp_buf;
+#ifdef CONFIG_ZLIB
+    z_stream zstream;
+#endif
+} LclContext;
+
+
+/*
+ *
+ * Helper functions
+ *
+ */
+static inline unsigned char fix (int pix14)
+{
+    int tmp;
+
+    tmp = (pix14 + 0x80000) >> 20;
+    if (tmp < 0)
+        return 0;
+    if (tmp > 255)
+        return 255;
+    return tmp;
+}
+
+
+
+static inline unsigned char get_b (unsigned char yq, signed char bq)
+{
+    return fix((yq << 20) + bq * 1858076);
+}
+
+
+
+static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
+{
+    return fix((yq << 20) - bq * 360857 - rq * 748830);
+}
+
+
+
+static inline unsigned char get_r (unsigned char yq, signed char rq)
+{
+    return fix((yq << 20) + rq * 1470103);
+}
+
+
+
+static int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr)
+{
+    unsigned char *destptr_bak = destptr;
+    unsigned char mask = 0;
+    unsigned char maskbit = 0;
+    unsigned int ofs, cnt;
+  
+    while (srclen > 0) {
+        if (maskbit == 0) {
+            mask = *(srcptr++);
+            maskbit = 8;
+            srclen--;
+            continue;
+        }
+        if ((mask & (1 << (--maskbit))) == 0) {
+            *(int*)destptr = *(int*)srcptr;
+            srclen -= 4;
+            destptr += 4;
+            srcptr += 4;
+        } else {
+            ofs = *(srcptr++);
+            cnt = *(srcptr++);
+            ofs += cnt * 256;;
+            cnt = ((cnt >> 3) & 0x1f) + 1;
+            ofs &= 0x7ff;
+            srclen -= 2;
+            cnt *= 4;
+            for (; cnt > 0; cnt--) {
+                *(destptr) = *(destptr - ofs);
+                destptr++;
+            }
+        }
+    }
+
+    return (destptr - destptr_bak);
+}
+
+
+
+
+/*
+ *
+ * Decode a frame
+ *
+ */
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+	LclContext * const c = (LclContext *)avctx->priv_data;
+	unsigned char *encoded = (unsigned char *)buf;
+    int pixel_ptr;
+    int row, col;
+    unsigned char *outptr;
+    unsigned int width = avctx->width; // Real image width
+    unsigned int height = avctx->height; // Real image height
+    unsigned int mszh_dlen;
+    unsigned char yq, y1q, uq, vq;
+    int uqvq;
+    unsigned int mthread_inlen, mthread_outlen;
+#ifdef CONFIG_ZLIB
+    int zret; // Zlib return code
+#endif
+    int len = buf_size;
+
+	/* no supplementary picture */
+	if (buf_size == 0)
+		return 0;
+
+	if(c->pic.data[0])
+		avctx->release_buffer(avctx, &c->pic);
+
+	c->pic.reference = 0;
+	c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
+	if(avctx->get_buffer(avctx, &c->pic) < 0){
+		av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+		return -1;
+	}
+
+    outptr = c->pic.data[0]; // Output image pointer
+
+    /* Decompress frame */
+    switch (avctx->codec_id) {
+        case CODEC_ID_MSZH:
+            switch (c->compression) {
+                case COMP_MSZH:
+                    if (c->flags & FLAG_MULTITHREAD) {
+                        mthread_inlen = *((unsigned int*)encoded);
+                        mthread_outlen = *((unsigned int*)(encoded+4));
+                        mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf);
+                        if (mthread_outlen != mszh_dlen) {
+                            av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
+                                   mthread_outlen, mszh_dlen);
+                        }
+                        mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
+                                                c->decomp_buf + mthread_outlen);
+                        if ((c->decomp_size - mthread_outlen) != mszh_dlen) {
+                            av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
+                                   c->decomp_size - mthread_outlen, mszh_dlen);
+                        }
+                        encoded = c->decomp_buf;
+                        len = c->decomp_size;
+                    } else {
+                        mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf);
+                        if (c->decomp_size != mszh_dlen) {
+                            av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
+                                   c->decomp_size, mszh_dlen);
+                        }
+                        encoded = c->decomp_buf;
+                        len = mszh_dlen;
+                    }
+                    break;
+                case COMP_MSZH_NOCOMP:
+                    break;
+                default:
+                    av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
+                    return -1;
+            }
+            break;
+        case CODEC_ID_ZLIB:
+#ifdef CONFIG_ZLIB
+            /* Using the original dll with normal compression (-1) and RGB format
+             * gives a file with ZLIB fourcc, but frame is really uncompressed.
+             * To be sure that's true check also frame size */
+            if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
+               (len == width * height * 3))
+                break;
+            zret = inflateReset(&(c->zstream));
+            if (zret != Z_OK) {
+                av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
+                return -1;
+            }
+            if (c->flags & FLAG_MULTITHREAD) {
+                mthread_inlen = *((unsigned int*)encoded);
+                mthread_outlen = *((unsigned int*)(encoded+4));
+                c->zstream.next_in = encoded + 8;
+                c->zstream.avail_in = mthread_inlen;
+                c->zstream.next_out = c->decomp_buf;
+                c->zstream.avail_out = mthread_outlen;    
+                zret = inflate(&(c->zstream), Z_FINISH);
+                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
+                    av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
+                    return -1;
+                }
+                if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
+                    av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
+                           mthread_outlen, c->zstream.total_out);
+                }
+                zret = inflateReset(&(c->zstream));
+                if (zret != Z_OK) {
+                    av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
+                    return -1;
+                }
+                c->zstream.next_in = encoded + 8 + mthread_inlen;
+                c->zstream.avail_in = len - mthread_inlen;
+                c->zstream.next_out = c->decomp_buf + mthread_outlen;
+                c->zstream.avail_out = mthread_outlen;    
+                zret = inflate(&(c->zstream), Z_FINISH);
+                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
+                    av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
+                    return -1;
+                }
+                if ((c->decomp_size - mthread_outlen) != (unsigned int)(c->zstream.total_out)) {
+                    av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
+                           c->decomp_size - mthread_outlen, c->zstream.total_out);
+                }
+            } else {
+                c->zstream.next_in = encoded;
+                c->zstream.avail_in = len;
+                c->zstream.next_out = c->decomp_buf;
+                c->zstream.avail_out = c->decomp_size;
+                zret = inflate(&(c->zstream), Z_FINISH);
+                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
+                    av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
+                    return -1;
+                }
+                if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
+                    av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
+                           c->decomp_size, c->zstream.total_out);
+                }
+            }
+            encoded = c->decomp_buf;
+            len = c->decomp_size;;
+#else
+            av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
+            return -1;
+#endif
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
+            return -1;
+    }
+
+
+    /* Apply PNG filter */
+    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
+        switch (c->imgtype) {
+            case IMGTYPE_YUV111:
+            case IMGTYPE_RGB24:
+                for (row = 0; row < height; row++) {
+                    pixel_ptr = row * width * 3;
+                    yq = encoded[pixel_ptr++];
+                    uqvq = encoded[pixel_ptr++];
+              	  uqvq+=(encoded[pixel_ptr++] << 8);
+                    for (col = 1; col < width; col++) {
+                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
+                        uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
+                        encoded[pixel_ptr+1] = (uqvq) & 0xff;
+                        encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
+                        pixel_ptr += 3;
+                    }
+                }
+                break;
+            case IMGTYPE_YUV422:
+                for (row = 0; row < height; row++) {
+                    pixel_ptr = row * width * 2;
+                    yq = uq = vq =0;
+                    for (col = 0; col < width/4; col++) {
+                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
+                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
+                        encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
+                        encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
+                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
+                        encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
+                        encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
+                        encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
+                        pixel_ptr += 8;
+                    }
+                }
+                break;
+            case IMGTYPE_YUV411:
+                for (row = 0; row < height; row++) {
+                    pixel_ptr = row * width / 2 * 3;
+                    yq = uq = vq =0;
+                    for (col = 0; col < width/4; col++) {
+                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
+                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
+                        encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
+                        encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
+                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
+                        encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
+                        pixel_ptr += 6;
+                    }
+                }
+                break;
+            case IMGTYPE_YUV211:
+                for (row = 0; row < height; row++) {
+                    pixel_ptr = row * width * 2;
+                    yq = uq = vq =0;
+                    for (col = 0; col < width/2; col++) {
+                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
+                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
+                        encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
+                        encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
+                        pixel_ptr += 4;
+                    }
+                }
+                break;
+            case IMGTYPE_YUV420:
+                for (row = 0; row < height/2; row++) {
+                    pixel_ptr = row * width * 3;
+                    yq = y1q = uq = vq =0;
+                    for (col = 0; col < width/2; col++) {
+                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
+                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
+                        encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
+                        encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
+                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
+                        encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
+                        pixel_ptr += 6;
+                    }
+                }
+                break;
+            default:
+                av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
+                return -1;
+        }
+    }
+
+    /* Convert colorspace */
+    switch (c->imgtype) {
+        case IMGTYPE_YUV111:
+            for (row = height - 1; row >= 0; row--) {
+                pixel_ptr = row * c->pic.linesize[0];
+                for (col = 0; col < width; col++) {
+                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
+                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
+                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
+                    encoded += 3;
+                }
+            }
+            break;
+        case IMGTYPE_YUV422:
+            for (row = height - 1; row >= 0; row--) {
+                pixel_ptr = row * c->pic.linesize[0];
+                for (col = 0; col < width/4; col++) {
+                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
+                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
+                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
+                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
+                    outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
+                    outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
+                    outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
+                    outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
+                    outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
+                    outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
+                    encoded += 8;
+                }
+            }
+            break;
+        case IMGTYPE_RGB24:
+            for (row = height - 1; row >= 0; row--) {
+                pixel_ptr = row * c->pic.linesize[0];
+                for (col = 0; col < width; col++) {
+                    outptr[pixel_ptr++] = encoded[0];
+                    outptr[pixel_ptr++] = encoded[1];
+                    outptr[pixel_ptr++] = encoded[2];
+                    encoded += 3;
+                }
+            }
+            break;
+        case IMGTYPE_YUV411:
+            for (row = height - 1; row >= 0; row--) {
+                pixel_ptr = row * c->pic.linesize[0];
+                for (col = 0; col < width/4; col++) {
+                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
+                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
+                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
+                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
+                    outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
+                    outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
+                    outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
+                    outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
+                    outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
+                    encoded += 6;
+                }
+            }
+            break;
+        case IMGTYPE_YUV211:
+            for (row = height - 1; row >= 0; row--) {
+                pixel_ptr = row * c->pic.linesize[0];
+                for (col = 0; col < width/2; col++) {
+                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
+                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
+                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
+                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
+                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
+                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
+                    encoded += 4;
+                }
+            }
+            break;
+        case IMGTYPE_YUV420:
+            for (row = height / 2 - 1; row >= 0; row--) {
+                pixel_ptr = 2 * row * c->pic.linesize[0];
+                for (col = 0; col < width/2; col++) {
+                    outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
+                    outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
+                    outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
+                    outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
+                    outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
+                    outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
+                    outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
+                    outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
+                    outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
+                    outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
+                    outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
+                    outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
+                    pixel_ptr += 6;
+                    encoded += 6;
+                }
+            }
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
+            return -1;
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = c->pic;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+
+
+/*
+ *
+ * Encode a frame
+ *
+ */
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
+    LclContext *c = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p = &c->pic;
+    int i;
+    int zret; // Zlib return code
+
+#ifndef CONFIG_ZLIB
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
+    return -1;
+#else
+
+    init_put_bits(&c->pb, buf, buf_size);
+    
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+    
+    if(avctx->pix_fmt != PIX_FMT_BGR24){
+        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
+        return -1;
+    }
+
+    zret = deflateReset(&(c->zstream));
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
+        return -1;
+    }
+    c->zstream.next_in = p->data[0];
+    c->zstream.avail_in = c->decomp_size;
+    c->zstream.next_out = c->comp_buf;
+    c->zstream.avail_out = c->max_comp_size;
+
+    zret = deflate(&(c->zstream), Z_FINISH);
+    if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
+        return -1;
+    }
+
+    for (i = 0; i < c->zstream.total_out; i++)
+        put_bits(&c->pb, 8, c->comp_buf[i]);
+    flush_put_bits(&c->pb);
+
+    return c->zstream.total_out;
+#endif
+}
+
+
+
+/*
+ *
+ * Init lcl decoder
+ *
+ */
+static int decode_init(AVCodecContext *avctx)
+{
+    LclContext * const c = (LclContext *)avctx->priv_data;
+    int basesize = avctx->width * avctx->height;
+    int zret; // Zlib return code
+
+    c->avctx = avctx;
+    avctx->has_b_frames = 0;
+
+    c->pic.data[0] = NULL;
+
+#ifdef CONFIG_ZLIB
+    // Needed if zlib unused or init aborted before inflateInit
+    memset(&(c->zstream), 0, sizeof(z_stream)); 
+#endif
+
+    if (avctx->extradata_size < 8) {
+        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
+        return 1;
+    }
+
+    /* Check codec type */ 
+    if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
+        ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
+        av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
+    }
+
+    /* Detect image type */
+    switch (c->imgtype = *((char *)avctx->extradata + 4)) {
+        case IMGTYPE_YUV111:
+            c->decomp_size = basesize * 3;
+            av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
+            break;
+        case IMGTYPE_YUV422:
+            c->decomp_size = basesize * 2;
+            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
+            break;
+        case IMGTYPE_RGB24:
+            c->decomp_size = basesize * 3;
+            av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
+            break;
+        case IMGTYPE_YUV411:
+            c->decomp_size = basesize / 2 * 3;
+            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
+            break;
+        case IMGTYPE_YUV211:
+            c->decomp_size = basesize * 2;
+            av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
+            break;
+        case IMGTYPE_YUV420:
+            c->decomp_size = basesize / 2 * 3;
+            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
+            return 1;
+    }
+
+    /* Detect compression method */
+    c->compression = *((char *)avctx->extradata + 5);
+    switch (avctx->codec_id) {
+        case CODEC_ID_MSZH:
+            switch (c->compression) {
+                case COMP_MSZH:
+                    av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
+                    break;
+                case COMP_MSZH_NOCOMP:
+                    c->decomp_size = 0;
+                    av_log(avctx, AV_LOG_INFO, "No compression.\n");
+                    break;
+                default:
+                    av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
+                    return 1;
+            }
+            break;
+        case CODEC_ID_ZLIB:
+#ifdef CONFIG_ZLIB
+            switch (c->compression) {
+                case COMP_ZLIB_HISPEED:
+                    av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
+                    break;
+                case COMP_ZLIB_HICOMP:
+                    av_log(avctx, AV_LOG_INFO, "High compression.\n");
+                    break;
+                case COMP_ZLIB_NORMAL:
+                    av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
+                    break;
+                default:
+                    if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
+                	    av_log(avctx, AV_LOG_ERROR, "Unusupported compression level for ZLIB: (%d).\n", c->compression);
+                        return 1;
+                    }
+                    av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
+            }
+#else
+            av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+            return 1;
+#endif
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
+            return 1;
+    }
+
+    /* Allocate decompression buffer */
+    /* 4*8 max overflow space for mszh decomp algorithm */
+    if (c->decomp_size) {
+        if ((c->decomp_buf = av_malloc(c->decomp_size+4*8)) == NULL) {
+            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
+            return 1;
+        }
+    }
+  
+    /* Detect flags */ 
+    c->flags = *((char *)avctx->extradata + 6);
+    if (c->flags & FLAG_MULTITHREAD)
+        av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
+    if (c->flags & FLAG_NULLFRAME)
+        av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
+    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
+        av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
+    if (c->flags & FLAGMASK_UNUSED)
+        av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
+
+    /* If needed init zlib */
+    if (avctx->codec_id == CODEC_ID_ZLIB) {
+#ifdef CONFIG_ZLIB
+        c->zstream.zalloc = Z_NULL;
+        c->zstream.zfree = Z_NULL;
+        c->zstream.opaque = Z_NULL;
+        zret = inflateInit(&(c->zstream));
+        if (zret != Z_OK) {
+            av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+            return 1;
+        }
+#else
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+    return 1;
+#endif
+    }
+
+    avctx->pix_fmt = PIX_FMT_BGR24;
+
+    return 0;
+}
+
+
+
+/*
+ *
+ * Init lcl encoder
+ *
+ */
+static int encode_init(AVCodecContext *avctx)
+{
+    LclContext *c = avctx->priv_data;
+    int zret; // Zlib return code
+
+#ifndef CONFIG_ZLIB
+    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
+    return 1;
+#else
+
+    c->avctx= avctx;
+        
+    assert(avctx->width && avctx->height);
+    
+    avctx->extradata= av_mallocz(8);
+    avctx->coded_frame= &c->pic;
+
+    // Will be user settable someday
+    c->compression = 6;
+    c->flags = 0;
+
+    switch(avctx->pix_fmt){
+        case PIX_FMT_BGR24:
+            c->imgtype = IMGTYPE_RGB24;
+            c->decomp_size = avctx->width * avctx->height * 3;
+            avctx->bits_per_sample= 24;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
+            return -1;
+    }
+
+    ((uint8_t*)avctx->extradata)[0]= 4;
+    ((uint8_t*)avctx->extradata)[1]= 0;
+    ((uint8_t*)avctx->extradata)[2]= 0;
+    ((uint8_t*)avctx->extradata)[3]= 0;
+    ((uint8_t*)avctx->extradata)[4]= c->imgtype;
+    ((uint8_t*)avctx->extradata)[5]= c->compression;
+    ((uint8_t*)avctx->extradata)[6]= c->flags;
+    ((uint8_t*)avctx->extradata)[7]= 0;
+    c->avctx->extradata_size= 8;
+    
+    c->zstream.zalloc = Z_NULL;
+    c->zstream.zfree = Z_NULL;
+    c->zstream.opaque = Z_NULL;
+    zret = deflateInit(&(c->zstream), c->compression);
+    if (zret != Z_OK) {
+        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
+        return 1;
+    }
+
+    if ((strlen(zlibVersion()) > 4) && (zlibVersion()[0] >= '1') && (zlibVersion()[2] >= '2')&&
+        (zlibVersion()[4] >= '0'))
+        c->max_comp_size = deflateBound(&(c->zstream), c->decomp_size);
+    else
+        /* Conservative upper bound taken from zlib v1.2.1 source */
+        c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
+                           ((c->decomp_size + 63) >> 6) + 11;
+    if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
+        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
+        return 1;
+    }
+
+    return 0;
+#endif
+}
+
+
+
+
+
+/*
+ *
+ * Uninit lcl decoder
+ *
+ */
+static int decode_end(AVCodecContext *avctx)
+{
+	LclContext * const c = (LclContext *)avctx->priv_data;
+
+	if (c->pic.data[0])
+		avctx->release_buffer(avctx, &c->pic);
+#ifdef CONFIG_ZLIB
+    inflateEnd(&(c->zstream));
+#endif
+
+	return 0;
+}
+
+
+
+/*
+ *
+ * Uninit lcl encoder
+ *
+ */
+static int encode_end(AVCodecContext *avctx)
+{
+    LclContext *c = avctx->priv_data;
+
+    av_freep(&avctx->extradata);
+    av_freep(c->comp_buf);
+#ifdef CONFIG_ZLIB
+    deflateEnd(&(c->zstream));
+#endif
+    
+    return 0;
+}
+
+AVCodec mszh_decoder = {
+	"mszh",
+	CODEC_TYPE_VIDEO,
+	CODEC_ID_MSZH,
+	sizeof(LclContext),
+	decode_init,
+	NULL,
+	decode_end,
+	decode_frame,
+	CODEC_CAP_DR1,
+};
+
+
+AVCodec zlib_decoder = {
+	"zlib",
+	CODEC_TYPE_VIDEO,
+	CODEC_ID_ZLIB,
+	sizeof(LclContext),
+	decode_init,
+	NULL,
+	decode_end,
+	decode_frame,
+	CODEC_CAP_DR1,
+};
+
+#ifdef CONFIG_ENCODERS
+
+AVCodec zlib_encoder = {
+    "zlib",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_ZLIB,
+    sizeof(LclContext),
+    encode_init,
+    encode_frame,
+    encode_end,
+//    .options = lcl_options,
+};
+
+#endif //CONFIG_ENCODERS