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libavcodec/lcldec.c

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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             av_memcpy_backptr(destptr, ofs, cnt);
00100             destptr += cnt;
00101         }
00102         maskbit >>= 1;
00103         if (!maskbit) {
00104             mask = *srcptr++;
00105             while (!mask) {
00106                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
00107                 memcpy(destptr, srcptr, 32);
00108                 destptr += 32;
00109                 srcptr += 32;
00110                 mask = *srcptr++;
00111             }
00112             maskbit = 0x80;
00113         }
00114     }
00115 
00116     return destptr - destptr_bak;
00117 }
00118 
00119 
00127 #if CONFIG_ZLIB_DECODER
00128 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
00129 {
00130     LclDecContext *c = avctx->priv_data;
00131     int zret = inflateReset(&c->zstream);
00132     if (zret != Z_OK) {
00133         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
00134         return -1;
00135     }
00136     c->zstream.next_in = src;
00137     c->zstream.avail_in = src_len;
00138     c->zstream.next_out = c->decomp_buf + offset;
00139     c->zstream.avail_out = c->decomp_size - offset;
00140     zret = inflate(&c->zstream, Z_FINISH);
00141     if (zret != Z_OK && zret != Z_STREAM_END) {
00142         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
00143         return -1;
00144     }
00145     if (expected != (unsigned int)c->zstream.total_out) {
00146         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
00147                expected, c->zstream.total_out);
00148         return -1;
00149     }
00150     return c->zstream.total_out;
00151 }
00152 #endif
00153 
00154 
00155 /*
00156  *
00157  * Decode a frame
00158  *
00159  */
00160 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
00161 {
00162     const uint8_t *buf = avpkt->data;
00163     int buf_size = avpkt->size;
00164     LclDecContext * const c = avctx->priv_data;
00165     unsigned char *encoded = (unsigned char *)buf;
00166     unsigned int pixel_ptr;
00167     int row, col;
00168     unsigned char *outptr;
00169     uint8_t *y_out, *u_out, *v_out;
00170     unsigned int width = avctx->width; // Real image width
00171     unsigned int height = avctx->height; // Real image height
00172     unsigned int mszh_dlen;
00173     unsigned char yq, y1q, uq, vq;
00174     int uqvq;
00175     unsigned int mthread_inlen, mthread_outlen;
00176     unsigned int len = buf_size;
00177 
00178     if(c->pic.data[0])
00179         avctx->release_buffer(avctx, &c->pic);
00180 
00181     c->pic.reference = 0;
00182     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
00183     if(avctx->get_buffer(avctx, &c->pic) < 0){
00184         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00185         return -1;
00186     }
00187 
00188     outptr = c->pic.data[0]; // Output image pointer
00189 
00190     /* Decompress frame */
00191     switch (avctx->codec_id) {
00192     case CODEC_ID_MSZH:
00193         switch (c->compression) {
00194         case COMP_MSZH:
00195             if (c->flags & FLAG_MULTITHREAD) {
00196                 mthread_inlen = AV_RL32(encoded);
00197                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
00198                 mthread_outlen = AV_RL32(encoded+4);
00199                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
00200                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
00201                 if (mthread_outlen != mszh_dlen) {
00202                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
00203                            mthread_outlen, mszh_dlen);
00204                     return -1;
00205                 }
00206                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
00207                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
00208                 if (mthread_outlen != mszh_dlen) {
00209                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
00210                            mthread_outlen, mszh_dlen);
00211                     return -1;
00212                 }
00213                 encoded = c->decomp_buf;
00214                 len = c->decomp_size;
00215             } else {
00216                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
00217                 if (c->decomp_size != mszh_dlen) {
00218                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
00219                            c->decomp_size, mszh_dlen);
00220                     return -1;
00221                 }
00222                 encoded = c->decomp_buf;
00223                 len = mszh_dlen;
00224             }
00225             break;
00226         case COMP_MSZH_NOCOMP:
00227             break;
00228         default:
00229             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
00230             return -1;
00231         }
00232         break;
00233 #if CONFIG_ZLIB_DECODER
00234     case CODEC_ID_ZLIB:
00235         /* Using the original dll with normal compression (-1) and RGB format
00236          * gives a file with ZLIB fourcc, but frame is really uncompressed.
00237          * To be sure that's true check also frame size */
00238         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
00239             len == width * height * 3)
00240             break;
00241         if (c->flags & FLAG_MULTITHREAD) {
00242             int ret;
00243             mthread_inlen = AV_RL32(encoded);
00244             mthread_inlen = FFMIN(mthread_inlen, len - 8);
00245             mthread_outlen = AV_RL32(encoded+4);
00246             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
00247             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
00248             if (ret < 0) return ret;
00249             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
00250                               mthread_outlen, mthread_outlen);
00251             if (ret < 0) return ret;
00252         } else {
00253             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
00254             if (ret < 0) return ret;
00255         }
00256         encoded = c->decomp_buf;
00257         len = c->decomp_size;
00258         break;
00259 #endif
00260     default:
00261         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
00262         return -1;
00263     }
00264 
00265 
00266     /* Apply PNG filter */
00267     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
00268         switch (c->imgtype) {
00269         case IMGTYPE_YUV111:
00270         case IMGTYPE_RGB24:
00271             for (row = 0; row < height; row++) {
00272                 pixel_ptr = row * width * 3;
00273                 yq = encoded[pixel_ptr++];
00274                 uqvq = AV_RL16(encoded+pixel_ptr);
00275                 pixel_ptr += 2;
00276                 for (col = 1; col < width; col++) {
00277                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00278                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
00279                     AV_WL16(encoded+pixel_ptr+1, uqvq);
00280                     pixel_ptr += 3;
00281                 }
00282             }
00283             break;
00284         case IMGTYPE_YUV422:
00285             for (row = 0; row < height; row++) {
00286                 pixel_ptr = row * width * 2;
00287                 yq = uq = vq =0;
00288                 for (col = 0; col < width/4; col++) {
00289                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00290                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00291                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00292                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00293                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00294                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
00295                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
00296                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
00297                     pixel_ptr += 8;
00298                 }
00299             }
00300             break;
00301         case IMGTYPE_YUV411:
00302             for (row = 0; row < height; row++) {
00303                 pixel_ptr = row * width / 2 * 3;
00304                 yq = uq = vq =0;
00305                 for (col = 0; col < width/4; col++) {
00306                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00307                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00308                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
00309                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
00310                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00311                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00312                     pixel_ptr += 6;
00313                 }
00314             }
00315             break;
00316         case IMGTYPE_YUV211:
00317             for (row = 0; row < height; row++) {
00318                 pixel_ptr = row * width * 2;
00319                 yq = uq = vq =0;
00320                 for (col = 0; col < width/2; col++) {
00321                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00322                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00323                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
00324                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
00325                     pixel_ptr += 4;
00326                 }
00327             }
00328             break;
00329         case IMGTYPE_YUV420:
00330             for (row = 0; row < height/2; row++) {
00331                 pixel_ptr = row * width * 3;
00332                 yq = y1q = uq = vq =0;
00333                 for (col = 0; col < width/2; col++) {
00334                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
00335                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
00336                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
00337                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
00338                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
00339                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
00340                     pixel_ptr += 6;
00341                 }
00342             }
00343             break;
00344         default:
00345             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
00346             return -1;
00347         }
00348     }
00349 
00350     /* Convert colorspace */
00351     y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
00352     u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
00353     v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];
00354     switch (c->imgtype) {
00355     case IMGTYPE_YUV111:
00356         for (row = 0; row < height; row++) {
00357             for (col = 0; col < width; col++) {
00358                 y_out[col] = *encoded++;
00359                 u_out[col] = *encoded++ + 128;
00360                 v_out[col] = *encoded++ + 128;
00361             }
00362             y_out -= c->pic.linesize[0];
00363             u_out -= c->pic.linesize[1];
00364             v_out -= c->pic.linesize[2];
00365         }
00366         break;
00367     case IMGTYPE_YUV422:
00368         for (row = 0; row < height; row++) {
00369             for (col = 0; col < width - 3; col += 4) {
00370                 memcpy(y_out + col, encoded, 4);
00371                 encoded += 4;
00372                 u_out[ col >> 1     ] = *encoded++ + 128;
00373                 u_out[(col >> 1) + 1] = *encoded++ + 128;
00374                 v_out[ col >> 1     ] = *encoded++ + 128;
00375                 v_out[(col >> 1) + 1] = *encoded++ + 128;
00376             }
00377             y_out -= c->pic.linesize[0];
00378             u_out -= c->pic.linesize[1];
00379             v_out -= c->pic.linesize[2];
00380         }
00381         break;
00382     case IMGTYPE_RGB24:
00383         for (row = height - 1; row >= 0; row--) {
00384             pixel_ptr = row * c->pic.linesize[0];
00385             memcpy(outptr + pixel_ptr, encoded, 3 * width);
00386             encoded += 3 * width;
00387         }
00388         break;
00389     case IMGTYPE_YUV411:
00390         for (row = 0; row < height; row++) {
00391             for (col = 0; col < width - 3; col += 4) {
00392                 memcpy(y_out + col, encoded, 4);
00393                 encoded += 4;
00394                 u_out[col >> 2] = *encoded++ + 128;
00395                 v_out[col >> 2] = *encoded++ + 128;
00396             }
00397             y_out -= c->pic.linesize[0];
00398             u_out -= c->pic.linesize[1];
00399             v_out -= c->pic.linesize[2];
00400         }
00401         break;
00402     case IMGTYPE_YUV211:
00403         for (row = 0; row < height; row++) {
00404             for (col = 0; col < width - 1; col += 2) {
00405                 memcpy(y_out + col, encoded, 2);
00406                 encoded += 2;
00407                 u_out[col >> 1] = *encoded++ + 128;
00408                 v_out[col >> 1] = *encoded++ + 128;
00409             }
00410             y_out -= c->pic.linesize[0];
00411             u_out -= c->pic.linesize[1];
00412             v_out -= c->pic.linesize[2];
00413         }
00414         break;
00415     case IMGTYPE_YUV420:
00416         u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
00417         v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
00418         for (row = 0; row < height - 1; row += 2) {
00419             for (col = 0; col < width - 1; col += 2) {
00420                 memcpy(y_out + col, encoded, 2);
00421                 encoded += 2;
00422                 memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
00423                 encoded += 2;
00424                 u_out[col >> 1] = *encoded++ + 128;
00425                 v_out[col >> 1] = *encoded++ + 128;
00426             }
00427             y_out -= c->pic.linesize[0] << 1;
00428             u_out -= c->pic.linesize[1];
00429             v_out -= c->pic.linesize[2];
00430         }
00431         break;
00432     default:
00433         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
00434         return -1;
00435     }
00436 
00437     *data_size = sizeof(AVFrame);
00438     *(AVFrame*)data = c->pic;
00439 
00440     /* always report that the buffer was completely consumed */
00441     return buf_size;
00442 }
00443 
00444 /*
00445  *
00446  * Init lcl decoder
00447  *
00448  */
00449 static av_cold int decode_init(AVCodecContext *avctx)
00450 {
00451     LclDecContext * const c = avctx->priv_data;
00452     unsigned int basesize = avctx->width * avctx->height;
00453     unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
00454     unsigned int max_decomp_size;
00455 
00456     if (avctx->extradata_size < 8) {
00457         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
00458         return 1;
00459     }
00460 
00461     /* Check codec type */
00462     if ((avctx->codec_id == CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
00463         (avctx->codec_id == CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
00464         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
00465     }
00466 
00467     /* Detect image type */
00468     switch (c->imgtype = avctx->extradata[4]) {
00469     case IMGTYPE_YUV111:
00470         c->decomp_size = basesize * 3;
00471         max_decomp_size = max_basesize * 3;
00472         avctx->pix_fmt = PIX_FMT_YUV444P;
00473         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
00474         break;
00475     case IMGTYPE_YUV422:
00476         c->decomp_size = basesize * 2;
00477         max_decomp_size = max_basesize * 2;
00478         avctx->pix_fmt = PIX_FMT_YUV422P;
00479         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
00480         break;
00481     case IMGTYPE_RGB24:
00482         c->decomp_size = basesize * 3;
00483         max_decomp_size = max_basesize * 3;
00484         avctx->pix_fmt = PIX_FMT_BGR24;
00485         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
00486         break;
00487     case IMGTYPE_YUV411:
00488         c->decomp_size = basesize / 2 * 3;
00489         max_decomp_size = max_basesize / 2 * 3;
00490         avctx->pix_fmt = PIX_FMT_YUV411P;
00491         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
00492         break;
00493     case IMGTYPE_YUV211:
00494         c->decomp_size = basesize * 2;
00495         max_decomp_size = max_basesize * 2;
00496         avctx->pix_fmt = PIX_FMT_YUV422P;
00497         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
00498         break;
00499     case IMGTYPE_YUV420:
00500         c->decomp_size = basesize / 2 * 3;
00501         max_decomp_size = max_basesize / 2 * 3;
00502         avctx->pix_fmt = PIX_FMT_YUV420P;
00503         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
00504         break;
00505     default:
00506         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
00507         return 1;
00508     }
00509 
00510     /* Detect compression method */
00511     c->compression = (int8_t)avctx->extradata[5];
00512     switch (avctx->codec_id) {
00513     case CODEC_ID_MSZH:
00514         switch (c->compression) {
00515         case COMP_MSZH:
00516             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
00517             break;
00518         case COMP_MSZH_NOCOMP:
00519             c->decomp_size = 0;
00520             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
00521             break;
00522         default:
00523             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
00524             return 1;
00525         }
00526         break;
00527 #if CONFIG_ZLIB_DECODER
00528     case CODEC_ID_ZLIB:
00529         switch (c->compression) {
00530         case COMP_ZLIB_HISPEED:
00531             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
00532             break;
00533         case COMP_ZLIB_HICOMP:
00534             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
00535             break;
00536         case COMP_ZLIB_NORMAL:
00537             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
00538             break;
00539         default:
00540             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
00541                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
00542                 return 1;
00543             }
00544             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
00545         }
00546         break;
00547 #endif
00548     default:
00549         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
00550         return 1;
00551     }
00552 
00553     /* Allocate decompression buffer */
00554     if (c->decomp_size) {
00555         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
00556             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
00557             return 1;
00558         }
00559     }
00560 
00561     /* Detect flags */
00562     c->flags = avctx->extradata[6];
00563     if (c->flags & FLAG_MULTITHREAD)
00564         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
00565     if (c->flags & FLAG_NULLFRAME)
00566         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
00567     if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
00568         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
00569     if (c->flags & FLAGMASK_UNUSED)
00570         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
00571 
00572     /* If needed init zlib */
00573 #if CONFIG_ZLIB_DECODER
00574     if (avctx->codec_id == CODEC_ID_ZLIB) {
00575         int zret;
00576         c->zstream.zalloc = Z_NULL;
00577         c->zstream.zfree = Z_NULL;
00578         c->zstream.opaque = Z_NULL;
00579         zret = inflateInit(&c->zstream);
00580         if (zret != Z_OK) {
00581             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00582             av_freep(&c->decomp_buf);
00583             return 1;
00584         }
00585     }
00586 #endif
00587 
00588     return 0;
00589 }
00590 
00591 /*
00592  *
00593  * Uninit lcl decoder
00594  *
00595  */
00596 static av_cold int decode_end(AVCodecContext *avctx)
00597 {
00598     LclDecContext * const c = avctx->priv_data;
00599 
00600     av_freep(&c->decomp_buf);
00601     if (c->pic.data[0])
00602         avctx->release_buffer(avctx, &c->pic);
00603 #if CONFIG_ZLIB_DECODER
00604     if (avctx->codec_id == CODEC_ID_ZLIB)
00605         inflateEnd(&c->zstream);
00606 #endif
00607 
00608     return 0;
00609 }
00610 
00611 #if CONFIG_MSZH_DECODER
00612 AVCodec mszh_decoder = {
00613     "mszh",
00614     AVMEDIA_TYPE_VIDEO,
00615     CODEC_ID_MSZH,
00616     sizeof(LclDecContext),
00617     decode_init,
00618     NULL,
00619     decode_end,
00620     decode_frame,
00621     CODEC_CAP_DR1,
00622     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
00623 };
00624 #endif
00625 
00626 #if CONFIG_ZLIB_DECODER
00627 AVCodec zlib_decoder = {
00628     "zlib",
00629     AVMEDIA_TYPE_VIDEO,
00630     CODEC_ID_ZLIB,
00631     sizeof(LclDecContext),
00632     decode_init,
00633     NULL,
00634     decode_end,
00635     decode_frame,
00636     CODEC_CAP_DR1,
00637     .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
00638 };
00639 #endif

Generated on Fri Sep 16 2011 17:17:38 for FFmpeg by  doxygen 1.7.1