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 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             break;
00234         default:
00235             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
00236             return -1;
00237         }
00238         break;
00239 #if CONFIG_ZLIB_DECODER
00240     case CODEC_ID_ZLIB:
00241         /* Using the original dll with normal compression (-1) and RGB format
00242          * gives a file with ZLIB fourcc, but frame is really uncompressed.
00243          * To be sure that's true check also frame size */
00244         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
00245             len == width * height * 3)
00246             break;
00247         if (c->flags & FLAG_MULTITHREAD) {
00248             int ret;
00249             mthread_inlen = AV_RL32(encoded);
00250             mthread_inlen = FFMIN(mthread_inlen, len - 8);
00251             mthread_outlen = AV_RL32(encoded+4);
00252             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
00253             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
00254             if (ret < 0) return ret;
00255             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
00256                               mthread_outlen, mthread_outlen);
00257             if (ret < 0) return ret;
00258         } else {
00259             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
00260             if (ret < 0) return ret;
00261         }
00262         encoded = c->decomp_buf;
00263         len = c->decomp_size;
00264         break;
00265 #endif
00266     default:
00267         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
00268         return -1;
00269     }
00270 
00271 
00272     /* Apply PNG filter */
00273     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
00274         switch (c->imgtype) {
00275         case IMGTYPE_YUV111:
00276         case IMGTYPE_RGB24:
00277             for (row = 0; row < height; row++) {
00278                 pixel_ptr = row * width * 3;
00279                 yq = encoded[pixel_ptr++];
00280                 uqvq = AV_RL16(encoded+pixel_ptr);
00281                 pixel_ptr += 2;
00282                 for (col = 1; col < width; col++) {
00283                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00284                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
00285                     AV_WL16(encoded+pixel_ptr+1, uqvq);
00286                     pixel_ptr += 3;
00287                 }
00288             }
00289             break;
00290         case IMGTYPE_YUV422:
00291             for (row = 0; row < height; row++) {
00292                 pixel_ptr = row * width * 2;
00293                 yq = uq = vq =0;
00294                 for (col = 0; col < width/4; col++) {
00295                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00296                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00297                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00298                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00299                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00300                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
00301                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
00302                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
00303                     pixel_ptr += 8;
00304                 }
00305             }
00306             break;
00307         case IMGTYPE_YUV411:
00308             for (row = 0; row < height; row++) {
00309                 pixel_ptr = row * width / 2 * 3;
00310                 yq = uq = vq =0;
00311                 for (col = 0; col < width/4; col++) {
00312                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00313                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00314                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00315                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00316                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00317                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00318                     pixel_ptr += 6;
00319                 }
00320             }
00321             break;
00322         case IMGTYPE_YUV211:
00323             for (row = 0; row < height; row++) {
00324                 pixel_ptr = row * width * 2;
00325                 yq = uq = vq =0;
00326                 for (col = 0; col < width/2; col++) {
00327                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00328                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00329                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
00330                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
00331                     pixel_ptr += 4;
00332                 }
00333             }
00334             break;
00335         case IMGTYPE_YUV420:
00336             for (row = 0; row < height/2; row++) {
00337                 pixel_ptr = row * width * 3;
00338                 yq = y1q = uq = vq =0;
00339                 for (col = 0; col < width/2; col++) {
00340                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00341                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00342                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
00343                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
00344                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00345                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00346                     pixel_ptr += 6;
00347                 }
00348             }
00349             break;
00350         default:
00351             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
00352             return -1;
00353         }
00354     }
00355 
00356     /* Convert colorspace */
00357     y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
00358     u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
00359     v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];
00360     switch (c->imgtype) {
00361     case IMGTYPE_YUV111:
00362         for (row = 0; row < height; row++) {
00363             for (col = 0; col < width; col++) {
00364                 y_out[col] = *encoded++;
00365                 u_out[col] = *encoded++ + 128;
00366                 v_out[col] = *encoded++ + 128;
00367             }
00368             y_out -= c->pic.linesize[0];
00369             u_out -= c->pic.linesize[1];
00370             v_out -= c->pic.linesize[2];
00371         }
00372         break;
00373     case IMGTYPE_YUV422:
00374         for (row = 0; row < height; row++) {
00375             for (col = 0; col < width - 3; col += 4) {
00376                 memcpy(y_out + col, encoded, 4);
00377                 encoded += 4;
00378                 u_out[ col >> 1     ] = *encoded++ + 128;
00379                 u_out[(col >> 1) + 1] = *encoded++ + 128;
00380                 v_out[ col >> 1     ] = *encoded++ + 128;
00381                 v_out[(col >> 1) + 1] = *encoded++ + 128;
00382             }
00383             y_out -= c->pic.linesize[0];
00384             u_out -= c->pic.linesize[1];
00385             v_out -= c->pic.linesize[2];
00386         }
00387         break;
00388     case IMGTYPE_RGB24:
00389         for (row = height - 1; row >= 0; row--) {
00390             pixel_ptr = row * c->pic.linesize[0];
00391             memcpy(outptr + pixel_ptr, encoded, 3 * width);
00392             encoded += 3 * width;
00393         }
00394         break;
00395     case IMGTYPE_YUV411:
00396         for (row = 0; row < height; row++) {
00397             for (col = 0; col < width - 3; col += 4) {
00398                 memcpy(y_out + col, encoded, 4);
00399                 encoded += 4;
00400                 u_out[col >> 2] = *encoded++ + 128;
00401                 v_out[col >> 2] = *encoded++ + 128;
00402             }
00403             y_out -= c->pic.linesize[0];
00404             u_out -= c->pic.linesize[1];
00405             v_out -= c->pic.linesize[2];
00406         }
00407         break;
00408     case IMGTYPE_YUV211:
00409         for (row = 0; row < height; row++) {
00410             for (col = 0; col < width - 1; col += 2) {
00411                 memcpy(y_out + col, encoded, 2);
00412                 encoded += 2;
00413                 u_out[col >> 1] = *encoded++ + 128;
00414                 v_out[col >> 1] = *encoded++ + 128;
00415             }
00416             y_out -= c->pic.linesize[0];
00417             u_out -= c->pic.linesize[1];
00418             v_out -= c->pic.linesize[2];
00419         }
00420         break;
00421     case IMGTYPE_YUV420:
00422         u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
00423         v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
00424         for (row = 0; row < height - 1; row += 2) {
00425             for (col = 0; col < width - 1; col += 2) {
00426                 memcpy(y_out + col, encoded, 2);
00427                 encoded += 2;
00428                 memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
00429                 encoded += 2;
00430                 u_out[col >> 1] = *encoded++ + 128;
00431                 v_out[col >> 1] = *encoded++ + 128;
00432             }
00433             y_out -= c->pic.linesize[0] << 1;
00434             u_out -= c->pic.linesize[1];
00435             v_out -= c->pic.linesize[2];
00436         }
00437         break;
00438     default:
00439         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
00440         return -1;
00441     }
00442 
00443     *data_size = sizeof(AVFrame);
00444     *(AVFrame*)data = c->pic;
00445 
00446     /* always report that the buffer was completely consumed */
00447     return buf_size;
00448 }
00449 
00450 /*
00451  *
00452  * Init lcl decoder
00453  *
00454  */
00455 static av_cold int decode_init(AVCodecContext *avctx)
00456 {
00457     LclDecContext * const c = avctx->priv_data;
00458     unsigned int basesize = avctx->width * avctx->height;
00459     unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
00460     unsigned int max_decomp_size;
00461 
00462     avcodec_get_frame_defaults(&c->pic);
00463     if (avctx->extradata_size < 8) {
00464         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
00465         return 1;
00466     }
00467 
00468     /* Check codec type */
00469     if ((avctx->codec_id == CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
00470         (avctx->codec_id == CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
00471         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
00472     }
00473 
00474     /* Detect image type */
00475     switch (c->imgtype = avctx->extradata[4]) {
00476     case IMGTYPE_YUV111:
00477         c->decomp_size = basesize * 3;
00478         max_decomp_size = max_basesize * 3;
00479         avctx->pix_fmt = PIX_FMT_YUV444P;
00480         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
00481         break;
00482     case IMGTYPE_YUV422:
00483         c->decomp_size = basesize * 2;
00484         max_decomp_size = max_basesize * 2;
00485         avctx->pix_fmt = PIX_FMT_YUV422P;
00486         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
00487         break;
00488     case IMGTYPE_RGB24:
00489         c->decomp_size = basesize * 3;
00490         max_decomp_size = max_basesize * 3;
00491         avctx->pix_fmt = PIX_FMT_BGR24;
00492         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
00493         break;
00494     case IMGTYPE_YUV411:
00495         c->decomp_size = basesize / 2 * 3;
00496         max_decomp_size = max_basesize / 2 * 3;
00497         avctx->pix_fmt = PIX_FMT_YUV411P;
00498         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
00499         break;
00500     case IMGTYPE_YUV211:
00501         c->decomp_size = basesize * 2;
00502         max_decomp_size = max_basesize * 2;
00503         avctx->pix_fmt = PIX_FMT_YUV422P;
00504         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
00505         break;
00506     case IMGTYPE_YUV420:
00507         c->decomp_size = basesize / 2 * 3;
00508         max_decomp_size = max_basesize / 2 * 3;
00509         avctx->pix_fmt = PIX_FMT_YUV420P;
00510         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
00511         break;
00512     default:
00513         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
00514         return 1;
00515     }
00516 
00517     /* Detect compression method */
00518     c->compression = (int8_t)avctx->extradata[5];
00519     switch (avctx->codec_id) {
00520     case CODEC_ID_MSZH:
00521         switch (c->compression) {
00522         case COMP_MSZH:
00523             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
00524             break;
00525         case COMP_MSZH_NOCOMP:
00526             c->decomp_size = 0;
00527             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
00528             break;
00529         default:
00530             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
00531             return 1;
00532         }
00533         break;
00534 #if CONFIG_ZLIB_DECODER
00535     case CODEC_ID_ZLIB:
00536         switch (c->compression) {
00537         case COMP_ZLIB_HISPEED:
00538             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
00539             break;
00540         case COMP_ZLIB_HICOMP:
00541             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
00542             break;
00543         case COMP_ZLIB_NORMAL:
00544             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
00545             break;
00546         default:
00547             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
00548                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
00549                 return 1;
00550             }
00551             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
00552         }
00553         break;
00554 #endif
00555     default:
00556         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
00557         return 1;
00558     }
00559 
00560     /* Allocate decompression buffer */
00561     if (c->decomp_size) {
00562         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
00563             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
00564             return 1;
00565         }
00566     }
00567 
00568     /* Detect flags */
00569     c->flags = avctx->extradata[6];
00570     if (c->flags & FLAG_MULTITHREAD)
00571         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
00572     if (c->flags & FLAG_NULLFRAME)
00573         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
00574     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
00575         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
00576     if (c->flags & FLAGMASK_UNUSED)
00577         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
00578 
00579     /* If needed init zlib */
00580 #if CONFIG_ZLIB_DECODER
00581     if (avctx->codec_id == CODEC_ID_ZLIB) {
00582         int zret;
00583         c->zstream.zalloc = Z_NULL;
00584         c->zstream.zfree = Z_NULL;
00585         c->zstream.opaque = Z_NULL;
00586         zret = inflateInit(&c->zstream);
00587         if (zret != Z_OK) {
00588             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00589             av_freep(&c->decomp_buf);
00590             return 1;
00591         }
00592     }
00593 #endif
00594 
00595     return 0;
00596 }
00597 
00598 /*
00599  *
00600  * Uninit lcl decoder
00601  *
00602  */
00603 static av_cold int decode_end(AVCodecContext *avctx)
00604 {
00605     LclDecContext * const c = avctx->priv_data;
00606 
00607     av_freep(&c->decomp_buf);
00608     if (c->pic.data[0])
00609         avctx->release_buffer(avctx, &c->pic);
00610 #if CONFIG_ZLIB_DECODER
00611     if (avctx->codec_id == CODEC_ID_ZLIB)
00612         inflateEnd(&c->zstream);
00613 #endif
00614 
00615     return 0;
00616 }
00617 
00618 #if CONFIG_MSZH_DECODER
00619 AVCodec ff_mszh_decoder = {
00620     .name           = "mszh",
00621     .type           = AVMEDIA_TYPE_VIDEO,
00622     .id             = CODEC_ID_MSZH,
00623     .priv_data_size = sizeof(LclDecContext),
00624     .init           = decode_init,
00625     .close          = decode_end,
00626     .decode         = decode_frame,
00627     .capabilities   = CODEC_CAP_DR1,
00628     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
00629 };
00630 #endif
00631 
00632 #if CONFIG_ZLIB_DECODER
00633 AVCodec ff_zlib_decoder = {
00634     .name           = "zlib",
00635     .type           = AVMEDIA_TYPE_VIDEO,
00636     .id             = CODEC_ID_ZLIB,
00637     .priv_data_size = sizeof(LclDecContext),
00638     .init           = decode_init,
00639     .close          = decode_end,
00640     .decode         = decode_frame,
00641     .capabilities   = CODEC_CAP_DR1,
00642     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
00643 };
00644 #endif