FFmpeg: libavcodec/lcldec.c Source File

00001 /*
00002  * LCL (LossLess Codec Library) Codec
00003  * Copyright (c) 2002-2004 Roberto Togni
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00041 #include <stdio.h>
00042 #include <stdlib.h>
00043 
00044 #include "avcodec.h"
00045 #include "bytestream.h"
00046 #include "lcl.h"
00047 #include "libavutil/lzo.h"
00048 
00049 #if CONFIG_ZLIB_DECODER
00050 #include <zlib.h>
00051 #endif
00052 
00053 /*
00054  * Decoder context
00055  */
00056 typedef struct LclDecContext {
00057     AVFrame pic;
00058 
00059     // Image type
00060     int imgtype;
00061     // Compression type
00062     int compression;
00063     // Flags
00064     int flags;
00065     // Decompressed data size
00066     unsigned int decomp_size;
00067     // Decompression buffer
00068     unsigned char* decomp_buf;
00069 #if CONFIG_ZLIB_DECODER
00070     z_stream zstream;
00071 #endif
00072 } LclDecContext;
00073 
00074 
00079 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
00080 {
00081     unsigned char *destptr_bak = destptr;
00082     unsigned char *destptr_end = destptr + destsize;
00083     const unsigned char *srcptr_end = srcptr + srclen;
00084     unsigned mask = *srcptr++;
00085     unsigned maskbit = 0x80;
00086 
00087     while (srcptr < srcptr_end && destptr < destptr_end) {
00088         if (!(mask & maskbit)) {
00089             memcpy(destptr, srcptr, 4);
00090             destptr += 4;
00091             srcptr += 4;
00092         } else {
00093             unsigned ofs = bytestream_get_le16(&srcptr);
00094             unsigned cnt = (ofs >> 11) + 1;
00095             ofs &= 0x7ff;
00096             ofs = FFMIN(ofs, destptr - destptr_bak);
00097             cnt *= 4;
00098             cnt = FFMIN(cnt, destptr_end - destptr);
00099             if (ofs) {
00100                 av_memcpy_backptr(destptr, ofs, cnt);
00101             } else {
00102                 // Not known what the correct behaviour is, but
00103                 // this at least avoids uninitialized data.
00104                 memset(destptr, 0, cnt);
00105             }
00106             destptr += cnt;
00107         }
00108         maskbit >>= 1;
00109         if (!maskbit) {
00110             mask = *srcptr++;
00111             while (!mask) {
00112                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
00113                 memcpy(destptr, srcptr, 32);
00114                 destptr += 32;
00115                 srcptr += 32;
00116                 mask = *srcptr++;
00117             }
00118             maskbit = 0x80;
00119         }
00120     }
00121 
00122     return destptr - destptr_bak;
00123 }
00124 
00125 
00126 #if CONFIG_ZLIB_DECODER
00127 
00134 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
00135 {
00136     LclDecContext *c = avctx->priv_data;
00137     int zret = inflateReset(&c->zstream);
00138     if (zret != Z_OK) {
00139         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
00140         return -1;
00141     }
00142     c->zstream.next_in = src;
00143     c->zstream.avail_in = src_len;
00144     c->zstream.next_out = c->decomp_buf + offset;
00145     c->zstream.avail_out = c->decomp_size - offset;
00146     zret = inflate(&c->zstream, Z_FINISH);
00147     if (zret != Z_OK && zret != Z_STREAM_END) {
00148         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
00149         return -1;
00150     }
00151     if (expected != (unsigned int)c->zstream.total_out) {
00152         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
00153                expected, c->zstream.total_out);
00154         return -1;
00155     }
00156     return c->zstream.total_out;
00157 }
00158 #endif
00159 
00160 
00161 /*
00162  *
00163  * Decode a frame
00164  *
00165  */
00166 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
00167 {
00168     const uint8_t *buf = avpkt->data;
00169     int buf_size = avpkt->size;
00170     LclDecContext * const c = avctx->priv_data;
00171     unsigned char *encoded = (unsigned char *)buf;
00172     unsigned int pixel_ptr;
00173     int row, col;
00174     unsigned char *outptr;
00175     uint8_t *y_out, *u_out, *v_out;
00176     unsigned int width = avctx->width; // Real image width
00177     unsigned int height = avctx->height; // Real image height
00178     unsigned int mszh_dlen;
00179     unsigned char yq, y1q, uq, vq;
00180     int uqvq;
00181     unsigned int mthread_inlen, mthread_outlen;
00182     unsigned int len = buf_size;
00183 
00184     if(c->pic.data[0])
00185         avctx->release_buffer(avctx, &c->pic);
00186 
00187     c->pic.reference = 0;
00188     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
00189     if(avctx->get_buffer(avctx, &c->pic) < 0){
00190         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00191         return -1;
00192     }
00193 
00194     outptr = c->pic.data[0]; // Output image pointer
00195 
00196     /* Decompress frame */
00197     switch (avctx->codec_id) {
00198     case AV_CODEC_ID_MSZH:
00199         switch (c->compression) {
00200         case COMP_MSZH:
00201             if (c->flags & FLAG_MULTITHREAD) {
00202                 mthread_inlen = AV_RL32(encoded);
00203                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
00204                 mthread_outlen = AV_RL32(encoded+4);
00205                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
00206                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
00207                 if (mthread_outlen != mszh_dlen) {
00208                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
00209                            mthread_outlen, mszh_dlen);
00210                     return -1;
00211                 }
00212                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
00213                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
00214                 if (mthread_outlen != mszh_dlen) {
00215                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
00216                            mthread_outlen, mszh_dlen);
00217                     return -1;
00218                 }
00219                 encoded = c->decomp_buf;
00220                 len = c->decomp_size;
00221             } else {
00222                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
00223                 if (c->decomp_size != mszh_dlen) {
00224                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
00225                            c->decomp_size, mszh_dlen);
00226                     return -1;
00227                 }
00228                 encoded = c->decomp_buf;
00229                 len = mszh_dlen;
00230             }
00231             break;
00232         case COMP_MSZH_NOCOMP: {
00233             int bppx2;
00234             switch (c->imgtype) {
00235             case IMGTYPE_YUV111:
00236             case IMGTYPE_RGB24:
00237                 bppx2 = 6;
00238                 break;
00239             case IMGTYPE_YUV422:
00240             case IMGTYPE_YUV211:
00241                 bppx2 = 4;
00242                 break;
00243             case IMGTYPE_YUV411:
00244             case IMGTYPE_YUV420:
00245                 bppx2 = 3;
00246                 break;
00247             default:
00248                 bppx2 = 0; // will error out below
00249                 break;
00250             }
00251             if (len < ((width * height * bppx2) >> 1))
00252                 return AVERROR_INVALIDDATA;
00253             break;
00254         }
00255         default:
00256             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
00257             return -1;
00258         }
00259         break;
00260 #if CONFIG_ZLIB_DECODER
00261     case AV_CODEC_ID_ZLIB:
00262         /* Using the original dll with normal compression (-1) and RGB format
00263          * gives a file with ZLIB fourcc, but frame is really uncompressed.
00264          * To be sure that's true check also frame size */
00265         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
00266             len == width * height * 3) {
00267             if (c->flags & FLAG_PNGFILTER) {
00268                 memcpy(c->decomp_buf, encoded, len);
00269                 encoded = c->decomp_buf;
00270             } else {
00271                 break;
00272             }
00273         } else if (c->flags & FLAG_MULTITHREAD) {
00274             int ret;
00275             mthread_inlen = AV_RL32(encoded);
00276             mthread_inlen = FFMIN(mthread_inlen, len - 8);
00277             mthread_outlen = AV_RL32(encoded+4);
00278             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
00279             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
00280             if (ret < 0) return ret;
00281             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
00282                               mthread_outlen, mthread_outlen);
00283             if (ret < 0) return ret;
00284         } else {
00285             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
00286             if (ret < 0) return ret;
00287         }
00288         encoded = c->decomp_buf;
00289         len = c->decomp_size;
00290         break;
00291 #endif
00292     default:
00293         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
00294         return -1;
00295     }
00296 
00297 
00298     /* Apply PNG filter */
00299     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
00300         switch (c->imgtype) {
00301         case IMGTYPE_YUV111:
00302         case IMGTYPE_RGB24:
00303             for (row = 0; row < height; row++) {
00304                 pixel_ptr = row * width * 3;
00305                 yq = encoded[pixel_ptr++];
00306                 uqvq = AV_RL16(encoded+pixel_ptr);
00307                 pixel_ptr += 2;
00308                 for (col = 1; col < width; col++) {
00309                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00310                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
00311                     AV_WL16(encoded+pixel_ptr+1, uqvq);
00312                     pixel_ptr += 3;
00313                 }
00314             }
00315             break;
00316         case IMGTYPE_YUV422:
00317             for (row = 0; row < height; row++) {
00318                 pixel_ptr = row * width * 2;
00319                 yq = uq = vq =0;
00320                 for (col = 0; col < width/4; col++) {
00321                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00322                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00323                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00324                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00325                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00326                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
00327                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
00328                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
00329                     pixel_ptr += 8;
00330                 }
00331             }
00332             break;
00333         case IMGTYPE_YUV411:
00334             for (row = 0; row < height; row++) {
00335                 pixel_ptr = row * width / 2 * 3;
00336                 yq = uq = vq =0;
00337                 for (col = 0; col < width/4; col++) {
00338                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00339                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00340                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00341                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00342                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00343                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00344                     pixel_ptr += 6;
00345                 }
00346             }
00347             break;
00348         case IMGTYPE_YUV211:
00349             for (row = 0; row < height; row++) {
00350                 pixel_ptr = row * width * 2;
00351                 yq = uq = vq =0;
00352                 for (col = 0; col < width/2; col++) {
00353                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00354                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00355                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
00356                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
00357                     pixel_ptr += 4;
00358                 }
00359             }
00360             break;
00361         case IMGTYPE_YUV420:
00362             for (row = 0; row < height/2; row++) {
00363                 pixel_ptr = row * width * 3;
00364                 yq = y1q = uq = vq =0;
00365                 for (col = 0; col < width/2; col++) {
00366                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00367                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00368                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
00369                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
00370                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00371                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00372                     pixel_ptr += 6;
00373                 }
00374             }
00375             break;
00376         default:
00377             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
00378             return -1;
00379         }
00380     }
00381 
00382     /* Convert colorspace */
00383     y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
00384     u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
00385     v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];
00386     switch (c->imgtype) {
00387     case IMGTYPE_YUV111:
00388         for (row = 0; row < height; row++) {
00389             for (col = 0; col < width; col++) {
00390                 y_out[col] = *encoded++;
00391                 u_out[col] = *encoded++ + 128;
00392                 v_out[col] = *encoded++ + 128;
00393             }
00394             y_out -= c->pic.linesize[0];
00395             u_out -= c->pic.linesize[1];
00396             v_out -= c->pic.linesize[2];
00397         }
00398         break;
00399     case IMGTYPE_YUV422:
00400         for (row = 0; row < height; row++) {
00401             for (col = 0; col < width - 3; col += 4) {
00402                 memcpy(y_out + col, encoded, 4);
00403                 encoded += 4;
00404                 u_out[ col >> 1     ] = *encoded++ + 128;
00405                 u_out[(col >> 1) + 1] = *encoded++ + 128;
00406                 v_out[ col >> 1     ] = *encoded++ + 128;
00407                 v_out[(col >> 1) + 1] = *encoded++ + 128;
00408             }
00409             y_out -= c->pic.linesize[0];
00410             u_out -= c->pic.linesize[1];
00411             v_out -= c->pic.linesize[2];
00412         }
00413         break;
00414     case IMGTYPE_RGB24:
00415         for (row = height - 1; row >= 0; row--) {
00416             pixel_ptr = row * c->pic.linesize[0];
00417             memcpy(outptr + pixel_ptr, encoded, 3 * width);
00418             encoded += 3 * width;
00419         }
00420         break;
00421     case IMGTYPE_YUV411:
00422         for (row = 0; row < height; row++) {
00423             for (col = 0; col < width - 3; col += 4) {
00424                 memcpy(y_out + col, encoded, 4);
00425                 encoded += 4;
00426                 u_out[col >> 2] = *encoded++ + 128;
00427                 v_out[col >> 2] = *encoded++ + 128;
00428             }
00429             y_out -= c->pic.linesize[0];
00430             u_out -= c->pic.linesize[1];
00431             v_out -= c->pic.linesize[2];
00432         }
00433         break;
00434     case IMGTYPE_YUV211:
00435         for (row = 0; row < height; row++) {
00436             for (col = 0; col < width - 1; col += 2) {
00437                 memcpy(y_out + col, encoded, 2);
00438                 encoded += 2;
00439                 u_out[col >> 1] = *encoded++ + 128;
00440                 v_out[col >> 1] = *encoded++ + 128;
00441             }
00442             y_out -= c->pic.linesize[0];
00443             u_out -= c->pic.linesize[1];
00444             v_out -= c->pic.linesize[2];
00445         }
00446         break;
00447     case IMGTYPE_YUV420:
00448         u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
00449         v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
00450         for (row = 0; row < height - 1; row += 2) {
00451             for (col = 0; col < width - 1; col += 2) {
00452                 memcpy(y_out + col, encoded, 2);
00453                 encoded += 2;
00454                 memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
00455                 encoded += 2;
00456                 u_out[col >> 1] = *encoded++ + 128;
00457                 v_out[col >> 1] = *encoded++ + 128;
00458             }
00459             y_out -= c->pic.linesize[0] << 1;
00460             u_out -= c->pic.linesize[1];
00461             v_out -= c->pic.linesize[2];
00462         }
00463         break;
00464     default:
00465         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
00466         return -1;
00467     }
00468 
00469     *data_size = sizeof(AVFrame);
00470     *(AVFrame*)data = c->pic;
00471 
00472     /* always report that the buffer was completely consumed */
00473     return buf_size;
00474 }
00475 
00476 /*
00477  *
00478  * Init lcl decoder
00479  *
00480  */
00481 static av_cold int decode_init(AVCodecContext *avctx)
00482 {
00483     LclDecContext * const c = avctx->priv_data;
00484     unsigned int basesize = avctx->width * avctx->height;
00485     unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
00486     unsigned int max_decomp_size;
00487 
00488     avcodec_get_frame_defaults(&c->pic);
00489     if (avctx->extradata_size < 8) {
00490         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
00491         return AVERROR_INVALIDDATA;
00492     }
00493 
00494     /* Check codec type */
00495     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
00496         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
00497         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
00498     }
00499 
00500     /* Detect image type */
00501     switch (c->imgtype = avctx->extradata[4]) {
00502     case IMGTYPE_YUV111:
00503         c->decomp_size = basesize * 3;
00504         max_decomp_size = max_basesize * 3;
00505         avctx->pix_fmt = PIX_FMT_YUV444P;
00506         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
00507         break;
00508     case IMGTYPE_YUV422:
00509         c->decomp_size = basesize * 2;
00510         max_decomp_size = max_basesize * 2;
00511         avctx->pix_fmt = PIX_FMT_YUV422P;
00512         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
00513         break;
00514     case IMGTYPE_RGB24:
00515         c->decomp_size = basesize * 3;
00516         max_decomp_size = max_basesize * 3;
00517         avctx->pix_fmt = PIX_FMT_BGR24;
00518         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
00519         break;
00520     case IMGTYPE_YUV411:
00521         c->decomp_size = basesize / 2 * 3;
00522         max_decomp_size = max_basesize / 2 * 3;
00523         avctx->pix_fmt = PIX_FMT_YUV411P;
00524         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
00525         break;
00526     case IMGTYPE_YUV211:
00527         c->decomp_size = basesize * 2;
00528         max_decomp_size = max_basesize * 2;
00529         avctx->pix_fmt = PIX_FMT_YUV422P;
00530         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
00531         break;
00532     case IMGTYPE_YUV420:
00533         c->decomp_size = basesize / 2 * 3;
00534         max_decomp_size = max_basesize / 2 * 3;
00535         avctx->pix_fmt = PIX_FMT_YUV420P;
00536         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
00537         break;
00538     default:
00539         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
00540         return AVERROR_INVALIDDATA;
00541     }
00542 
00543     /* Detect compression method */
00544     c->compression = (int8_t)avctx->extradata[5];
00545     switch (avctx->codec_id) {
00546     case AV_CODEC_ID_MSZH:
00547         switch (c->compression) {
00548         case COMP_MSZH:
00549             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
00550             break;
00551         case COMP_MSZH_NOCOMP:
00552             c->decomp_size = 0;
00553             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
00554             break;
00555         default:
00556             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
00557             return AVERROR_INVALIDDATA;
00558         }
00559         break;
00560 #if CONFIG_ZLIB_DECODER
00561     case AV_CODEC_ID_ZLIB:
00562         switch (c->compression) {
00563         case COMP_ZLIB_HISPEED:
00564             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
00565             break;
00566         case COMP_ZLIB_HICOMP:
00567             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
00568             break;
00569         case COMP_ZLIB_NORMAL:
00570             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
00571             break;
00572         default:
00573             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
00574                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
00575                 return AVERROR_INVALIDDATA;
00576             }
00577             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
00578         }
00579         break;
00580 #endif
00581     default:
00582         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
00583         return AVERROR_INVALIDDATA;
00584     }
00585 
00586     /* Allocate decompression buffer */
00587     if (c->decomp_size) {
00588         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
00589             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
00590             return AVERROR(ENOMEM);
00591         }
00592     }
00593 
00594     /* Detect flags */
00595     c->flags = avctx->extradata[6];
00596     if (c->flags & FLAG_MULTITHREAD)
00597         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
00598     if (c->flags & FLAG_NULLFRAME)
00599         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
00600     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
00601         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
00602     if (c->flags & FLAGMASK_UNUSED)
00603         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
00604 
00605     /* If needed init zlib */
00606 #if CONFIG_ZLIB_DECODER
00607     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
00608         int zret;
00609         c->zstream.zalloc = Z_NULL;
00610         c->zstream.zfree = Z_NULL;
00611         c->zstream.opaque = Z_NULL;
00612         zret = inflateInit(&c->zstream);
00613         if (zret != Z_OK) {
00614             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00615             av_freep(&c->decomp_buf);
00616             return AVERROR_UNKNOWN;
00617         }
00618     }
00619 #endif
00620 
00621     return 0;
00622 }
00623 
00624 /*
00625  *
00626  * Uninit lcl decoder
00627  *
00628  */
00629 static av_cold int decode_end(AVCodecContext *avctx)
00630 {
00631     LclDecContext * const c = avctx->priv_data;
00632 
00633     av_freep(&c->decomp_buf);
00634     if (c->pic.data[0])
00635         avctx->release_buffer(avctx, &c->pic);
00636 #if CONFIG_ZLIB_DECODER
00637     if (avctx->codec_id == AV_CODEC_ID_ZLIB)
00638         inflateEnd(&c->zstream);
00639 #endif
00640 
00641     return 0;
00642 }
00643 
00644 #if CONFIG_MSZH_DECODER
00645 AVCodec ff_mszh_decoder = {
00646     .name           = "mszh",
00647     .type           = AVMEDIA_TYPE_VIDEO,
00648     .id             = AV_CODEC_ID_MSZH,
00649     .priv_data_size = sizeof(LclDecContext),
00650     .init           = decode_init,
00651     .close          = decode_end,
00652     .decode         = decode_frame,
00653     .capabilities   = CODEC_CAP_DR1,
00654     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
00655 };
00656 #endif
00657 
00658 #if CONFIG_ZLIB_DECODER
00659 AVCodec ff_zlib_decoder = {
00660     .name           = "zlib",
00661     .type           = AVMEDIA_TYPE_VIDEO,
00662     .id             = AV_CODEC_ID_ZLIB,
00663     .priv_data_size = sizeof(LclDecContext),
00664     .init           = decode_init,
00665     .close          = decode_end,
00666     .decode         = decode_frame,
00667     .capabilities   = CODEC_CAP_DR1,
00668     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
00669 };
00670 #endif