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1 ccbfd4ba Roberto Togni
/*
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 * LCL (LossLess Codec Library) Codec
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 * Copyright (c) 2002-2004 Roberto Togni
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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/**
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 * @file lcl.c
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 * LCL (LossLess Codec Library) Video Codec
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 * Decoder for MSZH and ZLIB codecs
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 * Experimental encoder for ZLIB RGB24
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 *
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 * Fourcc: MSZH, ZLIB
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 *
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 * Original Win32 dll:
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 * Ver2.23 By Kenji Oshima 2000.09.20
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 * avimszh.dll, avizlib.dll
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 *
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 * A description of the decoding algorithm can be found here:
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 *   http://www.pcisys.net/~melanson/codecs
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 *
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 * Supports: BGR24 (RGB 24bpp)
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include "common.h"
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#include "avcodec.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#define BMPTYPE_YUV 1
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#define BMPTYPE_RGB 2
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#define IMGTYPE_YUV111 0
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#define IMGTYPE_YUV422 1
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#define IMGTYPE_RGB24 2
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#define IMGTYPE_YUV411 3
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#define IMGTYPE_YUV211 4
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#define IMGTYPE_YUV420 5
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#define COMP_MSZH 0
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#define COMP_MSZH_NOCOMP 1
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#define COMP_ZLIB_HISPEED 1
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#define COMP_ZLIB_HICOMP 9
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#define COMP_ZLIB_NORMAL -1
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#define FLAG_MULTITHREAD 1
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#define FLAG_NULLFRAME 2
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#define FLAG_PNGFILTER 4
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#define FLAGMASK_UNUSED 0xf8
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#define CODEC_MSZH 1
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#define CODEC_ZLIB 3
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#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
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#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
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/*
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 * Decoder context
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 */
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typedef struct LclContext {
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        AVCodecContext *avctx;
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        AVFrame pic;
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    PutBitContext pb;
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    // Image type
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    int imgtype;
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    // Compression type
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    int compression;
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    // Flags
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    int flags;
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    // Decompressed data size
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    unsigned int decomp_size;
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    // Decompression buffer
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    unsigned char* decomp_buf;
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    // Maximum compressed data size
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    unsigned int max_comp_size;
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    // Compression buffer
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    unsigned char* comp_buf;
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#ifdef CONFIG_ZLIB
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    z_stream zstream;
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#endif
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} LclContext;
105
106
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/*
108
 *
109
 * Helper functions
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 *
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 */
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static inline unsigned char fix (int pix14)
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{
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    int tmp;
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    tmp = (pix14 + 0x80000) >> 20;
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    if (tmp < 0)
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        return 0;
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    if (tmp > 255)
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        return 255;
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    return tmp;
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}
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static inline unsigned char get_b (unsigned char yq, signed char bq)
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{
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    return fix((yq << 20) + bq * 1858076);
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}
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static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
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{
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    return fix((yq << 20) - bq * 360857 - rq * 748830);
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}
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static inline unsigned char get_r (unsigned char yq, signed char rq)
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{
142
    return fix((yq << 20) + rq * 1470103);
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}
144
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146
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static int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr)
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{
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    unsigned char *destptr_bak = destptr;
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    unsigned char mask = 0;
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    unsigned char maskbit = 0;
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    unsigned int ofs, cnt;
153
  
154
    while (srclen > 0) {
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        if (maskbit == 0) {
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            mask = *(srcptr++);
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            maskbit = 8;
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            srclen--;
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            continue;
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        }
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        if ((mask & (1 << (--maskbit))) == 0) {
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            *(int*)destptr = *(int*)srcptr;
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            srclen -= 4;
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            destptr += 4;
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            srcptr += 4;
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        } else {
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            ofs = *(srcptr++);
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            cnt = *(srcptr++);
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            ofs += cnt * 256;;
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            cnt = ((cnt >> 3) & 0x1f) + 1;
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            ofs &= 0x7ff;
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            srclen -= 2;
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            cnt *= 4;
174
            for (; cnt > 0; cnt--) {
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                *(destptr) = *(destptr - ofs);
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                destptr++;
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            }
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        }
179
    }
180
181
    return (destptr - destptr_bak);
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}
183
184
185
186
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/*
188
 *
189
 * Decode a frame
190
 *
191
 */
192
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
193
{
194
        LclContext * const c = (LclContext *)avctx->priv_data;
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        unsigned char *encoded = (unsigned char *)buf;
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    int pixel_ptr;
197
    int row, col;
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    unsigned char *outptr;
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    unsigned int width = avctx->width; // Real image width
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    unsigned int height = avctx->height; // Real image height
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    unsigned int mszh_dlen;
202
    unsigned char yq, y1q, uq, vq;
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    int uqvq;
204
    unsigned int mthread_inlen, mthread_outlen;
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#ifdef CONFIG_ZLIB
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    int zret; // Zlib return code
207
#endif
208
    int len = buf_size;
209
210
        /* no supplementary picture */
211
        if (buf_size == 0)
212
                return 0;
213
214
        if(c->pic.data[0])
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                avctx->release_buffer(avctx, &c->pic);
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217
        c->pic.reference = 0;
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        c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
219
        if(avctx->get_buffer(avctx, &c->pic) < 0){
220
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
221
                return -1;
222
        }
223
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    outptr = c->pic.data[0]; // Output image pointer
225
226
    /* Decompress frame */
227
    switch (avctx->codec_id) {
228
        case CODEC_ID_MSZH:
229
            switch (c->compression) {
230
                case COMP_MSZH:
231
                    if (c->flags & FLAG_MULTITHREAD) {
232
                        mthread_inlen = *((unsigned int*)encoded);
233
                        mthread_outlen = *((unsigned int*)(encoded+4));
234
                        mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf);
235
                        if (mthread_outlen != mszh_dlen) {
236
                            av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
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                                   mthread_outlen, mszh_dlen);
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                        }
239
                        mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
240
                                                c->decomp_buf + mthread_outlen);
241
                        if ((c->decomp_size - mthread_outlen) != mszh_dlen) {
242
                            av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
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                                   c->decomp_size - mthread_outlen, mszh_dlen);
244
                        }
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                        encoded = c->decomp_buf;
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                        len = c->decomp_size;
247
                    } else {
248
                        mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf);
249
                        if (c->decomp_size != mszh_dlen) {
250
                            av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
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                                   c->decomp_size, mszh_dlen);
252
                        }
253
                        encoded = c->decomp_buf;
254
                        len = mszh_dlen;
255
                    }
256
                    break;
257
                case COMP_MSZH_NOCOMP:
258
                    break;
259
                default:
260
                    av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
261
                    return -1;
262
            }
263
            break;
264
        case CODEC_ID_ZLIB:
265
#ifdef CONFIG_ZLIB
266
            /* Using the original dll with normal compression (-1) and RGB format
267
             * gives a file with ZLIB fourcc, but frame is really uncompressed.
268
             * To be sure that's true check also frame size */
269
            if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
270
               (len == width * height * 3))
271
                break;
272
            zret = inflateReset(&(c->zstream));
273
            if (zret != Z_OK) {
274
                av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
275
                return -1;
276
            }
277
            if (c->flags & FLAG_MULTITHREAD) {
278
                mthread_inlen = *((unsigned int*)encoded);
279
                mthread_outlen = *((unsigned int*)(encoded+4));
280
                c->zstream.next_in = encoded + 8;
281
                c->zstream.avail_in = mthread_inlen;
282
                c->zstream.next_out = c->decomp_buf;
283
                c->zstream.avail_out = mthread_outlen;    
284
                zret = inflate(&(c->zstream), Z_FINISH);
285
                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
286
                    av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
287
                    return -1;
288
                }
289
                if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
290
                    av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
291
                           mthread_outlen, c->zstream.total_out);
292
                }
293
                zret = inflateReset(&(c->zstream));
294
                if (zret != Z_OK) {
295
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
296
                    return -1;
297
                }
298
                c->zstream.next_in = encoded + 8 + mthread_inlen;
299
                c->zstream.avail_in = len - mthread_inlen;
300
                c->zstream.next_out = c->decomp_buf + mthread_outlen;
301
                c->zstream.avail_out = mthread_outlen;    
302
                zret = inflate(&(c->zstream), Z_FINISH);
303
                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
304
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
305
                    return -1;
306
                }
307
                if ((c->decomp_size - mthread_outlen) != (unsigned int)(c->zstream.total_out)) {
308
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
309
                           c->decomp_size - mthread_outlen, c->zstream.total_out);
310
                }
311
            } else {
312
                c->zstream.next_in = encoded;
313
                c->zstream.avail_in = len;
314
                c->zstream.next_out = c->decomp_buf;
315
                c->zstream.avail_out = c->decomp_size;
316
                zret = inflate(&(c->zstream), Z_FINISH);
317
                if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
318
                    av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
319
                    return -1;
320
                }
321
                if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
322
                    av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
323
                           c->decomp_size, c->zstream.total_out);
324
                }
325
            }
326
            encoded = c->decomp_buf;
327
            len = c->decomp_size;;
328
#else
329
            av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
330
            return -1;
331
#endif
332
            break;
333
        default:
334
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
335
            return -1;
336
    }
337
338
339
    /* Apply PNG filter */
340
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
341
        switch (c->imgtype) {
342
            case IMGTYPE_YUV111:
343
            case IMGTYPE_RGB24:
344
                for (row = 0; row < height; row++) {
345
                    pixel_ptr = row * width * 3;
346
                    yq = encoded[pixel_ptr++];
347
                    uqvq = encoded[pixel_ptr++];
348
                        uqvq+=(encoded[pixel_ptr++] << 8);
349
                    for (col = 1; col < width; col++) {
350
                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
351
                        uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
352
                        encoded[pixel_ptr+1] = (uqvq) & 0xff;
353
                        encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
354
                        pixel_ptr += 3;
355
                    }
356
                }
357
                break;
358
            case IMGTYPE_YUV422:
359
                for (row = 0; row < height; row++) {
360
                    pixel_ptr = row * width * 2;
361
                    yq = uq = vq =0;
362
                    for (col = 0; col < width/4; col++) {
363
                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
364
                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
365
                        encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
366
                        encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
367
                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
368
                        encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
369
                        encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
370
                        encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
371
                        pixel_ptr += 8;
372
                    }
373
                }
374
                break;
375
            case IMGTYPE_YUV411:
376
                for (row = 0; row < height; row++) {
377
                    pixel_ptr = row * width / 2 * 3;
378
                    yq = uq = vq =0;
379
                    for (col = 0; col < width/4; col++) {
380
                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
381
                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
382
                        encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
383
                        encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
384
                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
385
                        encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
386
                        pixel_ptr += 6;
387
                    }
388
                }
389
                break;
390
            case IMGTYPE_YUV211:
391
                for (row = 0; row < height; row++) {
392
                    pixel_ptr = row * width * 2;
393
                    yq = uq = vq =0;
394
                    for (col = 0; col < width/2; col++) {
395
                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
396
                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
397
                        encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
398
                        encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
399
                        pixel_ptr += 4;
400
                    }
401
                }
402
                break;
403
            case IMGTYPE_YUV420:
404
                for (row = 0; row < height/2; row++) {
405
                    pixel_ptr = row * width * 3;
406
                    yq = y1q = uq = vq =0;
407
                    for (col = 0; col < width/2; col++) {
408
                        encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
409
                        encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
410
                        encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
411
                        encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
412
                        encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
413
                        encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
414
                        pixel_ptr += 6;
415
                    }
416
                }
417
                break;
418
            default:
419
                av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
420
                return -1;
421
        }
422
    }
423
424
    /* Convert colorspace */
425
    switch (c->imgtype) {
426
        case IMGTYPE_YUV111:
427
            for (row = height - 1; row >= 0; row--) {
428
                pixel_ptr = row * c->pic.linesize[0];
429
                for (col = 0; col < width; col++) {
430
                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
431
                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
432
                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
433
                    encoded += 3;
434
                }
435
            }
436
            break;
437
        case IMGTYPE_YUV422:
438
            for (row = height - 1; row >= 0; row--) {
439
                pixel_ptr = row * c->pic.linesize[0];
440
                for (col = 0; col < width/4; col++) {
441
                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
442
                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
443
                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
444
                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
445
                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
446
                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
447
                    outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
448
                    outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
449
                    outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
450
                    outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
451
                    outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
452
                    outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
453
                    encoded += 8;
454
                }
455
            }
456
            break;
457
        case IMGTYPE_RGB24:
458
            for (row = height - 1; row >= 0; row--) {
459
                pixel_ptr = row * c->pic.linesize[0];
460
                for (col = 0; col < width; col++) {
461
                    outptr[pixel_ptr++] = encoded[0];
462
                    outptr[pixel_ptr++] = encoded[1];
463
                    outptr[pixel_ptr++] = encoded[2];
464
                    encoded += 3;
465
                }
466
            }
467
            break;
468
        case IMGTYPE_YUV411:
469
            for (row = height - 1; row >= 0; row--) {
470
                pixel_ptr = row * c->pic.linesize[0];
471
                for (col = 0; col < width/4; col++) {
472
                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
473
                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
474
                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
475
                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
476
                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
477
                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
478
                    outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
479
                    outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
480
                    outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
481
                    outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
482
                    outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
483
                    outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
484
                    encoded += 6;
485
                }
486
            }
487
            break;
488
        case IMGTYPE_YUV211:
489
            for (row = height - 1; row >= 0; row--) {
490
                pixel_ptr = row * c->pic.linesize[0];
491
                for (col = 0; col < width/2; col++) {
492
                    outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
493
                    outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
494
                    outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
495
                    outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
496
                    outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
497
                    outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
498
                    encoded += 4;
499
                }
500
            }
501
            break;
502
        case IMGTYPE_YUV420:
503
            for (row = height / 2 - 1; row >= 0; row--) {
504
                pixel_ptr = 2 * row * c->pic.linesize[0];
505
                for (col = 0; col < width/2; col++) {
506
                    outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
507
                    outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
508
                    outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
509
                    outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
510
                    outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
511
                    outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
512
                    outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
513
                    outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
514
                    outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
515
                    outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
516
                    outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
517
                    outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
518
                    pixel_ptr += 6;
519
                    encoded += 6;
520
                }
521
            }
522
            break;
523
        default:
524
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
525
            return -1;
526
    }
527
528
    *data_size = sizeof(AVFrame);
529
    *(AVFrame*)data = c->pic;
530
531
    /* always report that the buffer was completely consumed */
532
    return buf_size;
533
}
534
535
536
537
/*
538
 *
539
 * Encode a frame
540
 *
541
 */
542
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
543
    LclContext *c = avctx->priv_data;
544
    AVFrame *pict = data;
545
    AVFrame * const p = &c->pic;
546
    int i;
547
    int zret; // Zlib return code
548
549
#ifndef CONFIG_ZLIB
550
    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
551
    return -1;
552
#else
553
554
    init_put_bits(&c->pb, buf, buf_size);
555
    
556
    *p = *pict;
557
    p->pict_type= FF_I_TYPE;
558
    p->key_frame= 1;
559
    
560
    if(avctx->pix_fmt != PIX_FMT_BGR24){
561
        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
562
        return -1;
563
    }
564
565
    zret = deflateReset(&(c->zstream));
566
    if (zret != Z_OK) {
567
        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
568
        return -1;
569
    }
570
    c->zstream.next_in = p->data[0];
571
    c->zstream.avail_in = c->decomp_size;
572
    c->zstream.next_out = c->comp_buf;
573
    c->zstream.avail_out = c->max_comp_size;
574
575
    zret = deflate(&(c->zstream), Z_FINISH);
576
    if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
577
        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
578
        return -1;
579
    }
580
581
    for (i = 0; i < c->zstream.total_out; i++)
582
        put_bits(&c->pb, 8, c->comp_buf[i]);
583
    flush_put_bits(&c->pb);
584
585
    return c->zstream.total_out;
586
#endif
587
}
588
589
590
591
/*
592
 *
593
 * Init lcl decoder
594
 *
595
 */
596
static int decode_init(AVCodecContext *avctx)
597
{
598
    LclContext * const c = (LclContext *)avctx->priv_data;
599
    int basesize = avctx->width * avctx->height;
600
    int zret; // Zlib return code
601
602
    c->avctx = avctx;
603
    avctx->has_b_frames = 0;
604
605
    c->pic.data[0] = NULL;
606
607
#ifdef CONFIG_ZLIB
608
    // Needed if zlib unused or init aborted before inflateInit
609
    memset(&(c->zstream), 0, sizeof(z_stream)); 
610
#endif
611
612
    if (avctx->extradata_size < 8) {
613
        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
614
        return 1;
615
    }
616
617
    /* Check codec type */ 
618
    if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
619
        ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
620
        av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
621
    }
622
623
    /* Detect image type */
624
    switch (c->imgtype = *((char *)avctx->extradata + 4)) {
625
        case IMGTYPE_YUV111:
626
            c->decomp_size = basesize * 3;
627
            av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
628
            break;
629
        case IMGTYPE_YUV422:
630
            c->decomp_size = basesize * 2;
631
            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
632
            break;
633
        case IMGTYPE_RGB24:
634
            c->decomp_size = basesize * 3;
635
            av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
636
            break;
637
        case IMGTYPE_YUV411:
638
            c->decomp_size = basesize / 2 * 3;
639
            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
640
            break;
641
        case IMGTYPE_YUV211:
642
            c->decomp_size = basesize * 2;
643
            av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
644
            break;
645
        case IMGTYPE_YUV420:
646
            c->decomp_size = basesize / 2 * 3;
647
            av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
648
            break;
649
        default:
650
            av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
651
            return 1;
652
    }
653
654
    /* Detect compression method */
655
    c->compression = *((char *)avctx->extradata + 5);
656
    switch (avctx->codec_id) {
657
        case CODEC_ID_MSZH:
658
            switch (c->compression) {
659
                case COMP_MSZH:
660
                    av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
661
                    break;
662
                case COMP_MSZH_NOCOMP:
663
                    c->decomp_size = 0;
664
                    av_log(avctx, AV_LOG_INFO, "No compression.\n");
665
                    break;
666
                default:
667
                    av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
668
                    return 1;
669
            }
670
            break;
671
        case CODEC_ID_ZLIB:
672
#ifdef CONFIG_ZLIB
673
            switch (c->compression) {
674
                case COMP_ZLIB_HISPEED:
675
                    av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
676
                    break;
677
                case COMP_ZLIB_HICOMP:
678
                    av_log(avctx, AV_LOG_INFO, "High compression.\n");
679
                    break;
680
                case COMP_ZLIB_NORMAL:
681
                    av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
682
                    break;
683
                default:
684
                    if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
685
                            av_log(avctx, AV_LOG_ERROR, "Unusupported compression level for ZLIB: (%d).\n", c->compression);
686
                        return 1;
687
                    }
688
                    av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
689
            }
690
#else
691
            av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
692
            return 1;
693
#endif
694
            break;
695
        default:
696
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
697
            return 1;
698
    }
699
700
    /* Allocate decompression buffer */
701
    /* 4*8 max overflow space for mszh decomp algorithm */
702
    if (c->decomp_size) {
703
        if ((c->decomp_buf = av_malloc(c->decomp_size+4*8)) == NULL) {
704
            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
705
            return 1;
706
        }
707
    }
708
  
709
    /* Detect flags */ 
710
    c->flags = *((char *)avctx->extradata + 6);
711
    if (c->flags & FLAG_MULTITHREAD)
712
        av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
713
    if (c->flags & FLAG_NULLFRAME)
714
        av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
715
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
716
        av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
717
    if (c->flags & FLAGMASK_UNUSED)
718
        av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
719
720
    /* If needed init zlib */
721
    if (avctx->codec_id == CODEC_ID_ZLIB) {
722
#ifdef CONFIG_ZLIB
723
        c->zstream.zalloc = Z_NULL;
724
        c->zstream.zfree = Z_NULL;
725
        c->zstream.opaque = Z_NULL;
726
        zret = inflateInit(&(c->zstream));
727
        if (zret != Z_OK) {
728
            av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
729
            return 1;
730
        }
731
#else
732
    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
733
    return 1;
734
#endif
735
    }
736
737
    avctx->pix_fmt = PIX_FMT_BGR24;
738
739
    return 0;
740
}
741
742
743
744
/*
745
 *
746
 * Init lcl encoder
747
 *
748
 */
749
static int encode_init(AVCodecContext *avctx)
750
{
751
    LclContext *c = avctx->priv_data;
752
    int zret; // Zlib return code
753
754
#ifndef CONFIG_ZLIB
755
    av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
756
    return 1;
757
#else
758
759
    c->avctx= avctx;
760
        
761
    assert(avctx->width && avctx->height);
762
    
763
    avctx->extradata= av_mallocz(8);
764
    avctx->coded_frame= &c->pic;
765
766
    // Will be user settable someday
767
    c->compression = 6;
768
    c->flags = 0;
769
770
    switch(avctx->pix_fmt){
771
        case PIX_FMT_BGR24:
772
            c->imgtype = IMGTYPE_RGB24;
773
            c->decomp_size = avctx->width * avctx->height * 3;
774
            avctx->bits_per_sample= 24;
775
            break;
776
        default:
777
            av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
778
            return -1;
779
    }
780
781
    ((uint8_t*)avctx->extradata)[0]= 4;
782
    ((uint8_t*)avctx->extradata)[1]= 0;
783
    ((uint8_t*)avctx->extradata)[2]= 0;
784
    ((uint8_t*)avctx->extradata)[3]= 0;
785
    ((uint8_t*)avctx->extradata)[4]= c->imgtype;
786
    ((uint8_t*)avctx->extradata)[5]= c->compression;
787
    ((uint8_t*)avctx->extradata)[6]= c->flags;
788
    ((uint8_t*)avctx->extradata)[7]= 0;
789
    c->avctx->extradata_size= 8;
790
    
791
    c->zstream.zalloc = Z_NULL;
792
    c->zstream.zfree = Z_NULL;
793
    c->zstream.opaque = Z_NULL;
794
    zret = deflateInit(&(c->zstream), c->compression);
795
    if (zret != Z_OK) {
796
        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
797
        return 1;
798
    }
799
800
        /* Conservative upper bound taken from zlib v1.2.1 source */
801
        c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
802
                           ((c->decomp_size + 63) >> 6) + 11;
803
    if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
804
        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
805
        return 1;
806
    }
807
808
    return 0;
809
#endif
810
}
811
812
813
814
815
816
/*
817
 *
818
 * Uninit lcl decoder
819
 *
820
 */
821
static int decode_end(AVCodecContext *avctx)
822
{
823
        LclContext * const c = (LclContext *)avctx->priv_data;
824
825
        if (c->pic.data[0])
826
                avctx->release_buffer(avctx, &c->pic);
827
#ifdef CONFIG_ZLIB
828
    inflateEnd(&(c->zstream));
829
#endif
830
831
        return 0;
832
}
833
834
835
836
/*
837
 *
838
 * Uninit lcl encoder
839
 *
840
 */
841
static int encode_end(AVCodecContext *avctx)
842
{
843
    LclContext *c = avctx->priv_data;
844
845
    av_freep(&avctx->extradata);
846
    av_freep(c->comp_buf);
847
#ifdef CONFIG_ZLIB
848
    deflateEnd(&(c->zstream));
849
#endif
850
    
851
    return 0;
852
}
853
854
AVCodec mszh_decoder = {
855
        "mszh",
856
        CODEC_TYPE_VIDEO,
857
        CODEC_ID_MSZH,
858
        sizeof(LclContext),
859
        decode_init,
860
        NULL,
861
        decode_end,
862
        decode_frame,
863
        CODEC_CAP_DR1,
864
};
865
866
867
AVCodec zlib_decoder = {
868
        "zlib",
869
        CODEC_TYPE_VIDEO,
870
        CODEC_ID_ZLIB,
871
        sizeof(LclContext),
872
        decode_init,
873
        NULL,
874
        decode_end,
875
        decode_frame,
876
        CODEC_CAP_DR1,
877
};
878
879
#ifdef CONFIG_ENCODERS
880
881
AVCodec zlib_encoder = {
882
    "zlib",
883
    CODEC_TYPE_VIDEO,
884
    CODEC_ID_ZLIB,
885
    sizeof(LclContext),
886
    encode_init,
887
    encode_frame,
888
    encode_end,
889
//    .options = lcl_options,
890
};
891
892
#endif //CONFIG_ENCODERS