Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * LCL (LossLess Codec Library) Codec
  3.  * Copyright (c) 2002-2004 Roberto Togni
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * LCL (LossLess Codec Library) Video Codec
  25.  * Decoder for MSZH and ZLIB codecs
  26.  * Experimental encoder for ZLIB RGB24
  27.  *
  28.  * Fourcc: MSZH, ZLIB
  29.  *
  30.  * Original Win32 dll:
  31.  * Ver2.23 By Kenji Oshima 2000.09.20
  32.  * avimszh.dll, avizlib.dll
  33.  *
  34.  * A description of the decoding algorithm can be found here:
  35.  *   http://www.pcisys.net/~melanson/codecs
  36.  *
  37.  * Supports: BGR24 (RGB 24bpp)
  38.  *
  39.  */
  40.  
  41. #include <stdio.h>
  42. #include <stdlib.h>
  43.  
  44. #include "libavutil/mem.h"
  45. #include "libavutil/pixdesc.h"
  46. #include "avcodec.h"
  47. #include "bytestream.h"
  48. #include "internal.h"
  49. #include "lcl.h"
  50.  
  51. #if CONFIG_ZLIB_DECODER
  52. #include <zlib.h>
  53. #endif
  54.  
  55. /*
  56.  * Decoder context
  57.  */
  58. typedef struct LclDecContext {
  59.     // Image type
  60.     int imgtype;
  61.     // Compression type
  62.     int compression;
  63.     // Flags
  64.     int flags;
  65.     // Decompressed data size
  66.     unsigned int decomp_size;
  67.     // Decompression buffer
  68.     unsigned char* decomp_buf;
  69. #if CONFIG_ZLIB_DECODER
  70.     z_stream zstream;
  71. #endif
  72. } LclDecContext;
  73.  
  74.  
  75. /**
  76.  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
  77.  * @param destptr must be padded sufficiently for av_memcpy_backptr
  78.  */
  79. static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
  80. {
  81.     unsigned char *destptr_bak = destptr;
  82.     unsigned char *destptr_end = destptr + destsize;
  83.     const unsigned char *srcptr_end = srcptr + srclen;
  84.     unsigned mask = *srcptr++;
  85.     unsigned maskbit = 0x80;
  86.  
  87.     while (srcptr < srcptr_end && destptr < destptr_end) {
  88.         if (!(mask & maskbit)) {
  89.             memcpy(destptr, srcptr, 4);
  90.             destptr += 4;
  91.             srcptr += 4;
  92.         } else {
  93.             unsigned ofs = bytestream_get_le16(&srcptr);
  94.             unsigned cnt = (ofs >> 11) + 1;
  95.             ofs &= 0x7ff;
  96.             ofs = FFMIN(ofs, destptr - destptr_bak);
  97.             cnt *= 4;
  98.             cnt = FFMIN(cnt, destptr_end - destptr);
  99.             if (ofs) {
  100.                 av_memcpy_backptr(destptr, ofs, cnt);
  101.             } else {
  102.                 // Not known what the correct behaviour is, but
  103.                 // this at least avoids uninitialized data.
  104.                 memset(destptr, 0, cnt);
  105.             }
  106.             destptr += cnt;
  107.         }
  108.         maskbit >>= 1;
  109.         if (!maskbit) {
  110.             mask = *srcptr++;
  111.             while (!mask) {
  112.                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
  113.                 memcpy(destptr, srcptr, 32);
  114.                 destptr += 32;
  115.                 srcptr += 32;
  116.                 mask = *srcptr++;
  117.             }
  118.             maskbit = 0x80;
  119.         }
  120.     }
  121.  
  122.     return destptr - destptr_bak;
  123. }
  124.  
  125.  
  126. #if CONFIG_ZLIB_DECODER
  127. /**
  128.  * @brief decompress a zlib-compressed data block into decomp_buf
  129.  * @param src compressed input buffer
  130.  * @param src_len data length in input buffer
  131.  * @param offset offset in decomp_buf
  132.  * @param expected expected decompressed length
  133.  */
  134. static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
  135. {
  136.     LclDecContext *c = avctx->priv_data;
  137.     int zret = inflateReset(&c->zstream);
  138.     if (zret != Z_OK) {
  139.         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
  140.         return AVERROR_UNKNOWN;
  141.     }
  142.     c->zstream.next_in = (uint8_t *)src;
  143.     c->zstream.avail_in = src_len;
  144.     c->zstream.next_out = c->decomp_buf + offset;
  145.     c->zstream.avail_out = c->decomp_size - offset;
  146.     zret = inflate(&c->zstream, Z_FINISH);
  147.     if (zret != Z_OK && zret != Z_STREAM_END) {
  148.         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
  149.         return AVERROR_UNKNOWN;
  150.     }
  151.     if (expected != (unsigned int)c->zstream.total_out) {
  152.         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
  153.                expected, c->zstream.total_out);
  154.         return AVERROR_UNKNOWN;
  155.     }
  156.     return c->zstream.total_out;
  157. }
  158. #endif
  159.  
  160.  
  161. /*
  162.  *
  163.  * Decode a frame
  164.  *
  165.  */
  166. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
  167. {
  168.     AVFrame *frame = data;
  169.     const uint8_t *buf = avpkt->data;
  170.     int buf_size = avpkt->size;
  171.     LclDecContext * const c = avctx->priv_data;
  172.     unsigned char *encoded = (unsigned char *)buf;
  173.     unsigned int pixel_ptr;
  174.     int row, col;
  175.     unsigned char *outptr;
  176.     uint8_t *y_out, *u_out, *v_out;
  177.     unsigned int width = avctx->width; // Real image width
  178.     unsigned int height = avctx->height; // Real image height
  179.     unsigned int mszh_dlen;
  180.     unsigned char yq, y1q, uq, vq;
  181.     int uqvq, ret;
  182.     unsigned int mthread_inlen, mthread_outlen;
  183.     unsigned int len = buf_size;
  184.  
  185.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  186.         return ret;
  187.  
  188.     outptr = frame->data[0]; // Output image pointer
  189.  
  190.     /* Decompress frame */
  191.     switch (avctx->codec_id) {
  192.     case AV_CODEC_ID_MSZH:
  193.         switch (c->compression) {
  194.         case COMP_MSZH:
  195.             if (c->imgtype == IMGTYPE_RGB24 && len == width * height * 3) {
  196.                 ;
  197.             } else if (c->flags & FLAG_MULTITHREAD) {
  198.                 mthread_inlen = AV_RL32(encoded);
  199.                 if (len < 8) {
  200.                     av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
  201.                     return AVERROR_INVALIDDATA;
  202.                 }
  203.                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
  204.                 mthread_outlen = AV_RL32(encoded+4);
  205.                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
  206.                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
  207.                 if (mthread_outlen != mszh_dlen) {
  208.                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
  209.                            mthread_outlen, mszh_dlen);
  210.                     return AVERROR_INVALIDDATA;
  211.                 }
  212.                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
  213.                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
  214.                 if (mthread_outlen != mszh_dlen) {
  215.                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
  216.                            mthread_outlen, mszh_dlen);
  217.                     return AVERROR_INVALIDDATA;
  218.                 }
  219.                 encoded = c->decomp_buf;
  220.                 len = c->decomp_size;
  221.             } else {
  222.                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
  223.                 if (c->decomp_size != mszh_dlen) {
  224.                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
  225.                            c->decomp_size, mszh_dlen);
  226.                     return AVERROR_INVALIDDATA;
  227.                 }
  228.                 encoded = c->decomp_buf;
  229.                 len = mszh_dlen;
  230.             }
  231.             break;
  232.         case COMP_MSZH_NOCOMP: {
  233.             int bppx2;
  234.             switch (c->imgtype) {
  235.             case IMGTYPE_YUV111:
  236.             case IMGTYPE_RGB24:
  237.                 bppx2 = 6;
  238.                 break;
  239.             case IMGTYPE_YUV422:
  240.             case IMGTYPE_YUV211:
  241.                 bppx2 = 4;
  242.                 break;
  243.             case IMGTYPE_YUV411:
  244.             case IMGTYPE_YUV420:
  245.                 bppx2 = 3;
  246.                 break;
  247.             default:
  248.                 bppx2 = 0; // will error out below
  249.                 break;
  250.             }
  251.             if (len < ((width * height * bppx2) >> 1))
  252.                 return AVERROR_INVALIDDATA;
  253.             break;
  254.         }
  255.         default:
  256.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
  257.             return AVERROR_INVALIDDATA;
  258.         }
  259.         break;
  260. #if CONFIG_ZLIB_DECODER
  261.     case AV_CODEC_ID_ZLIB:
  262.         /* Using the original dll with normal compression (-1) and RGB format
  263.          * gives a file with ZLIB fourcc, but frame is really uncompressed.
  264.          * To be sure that's true check also frame size */
  265.         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
  266.             len == width * height * 3) {
  267.             if (c->flags & FLAG_PNGFILTER) {
  268.                 memcpy(c->decomp_buf, encoded, len);
  269.                 encoded = c->decomp_buf;
  270.             } else {
  271.                 break;
  272.             }
  273.         } else if (c->flags & FLAG_MULTITHREAD) {
  274.             mthread_inlen = AV_RL32(encoded);
  275.             mthread_inlen = FFMIN(mthread_inlen, len - 8);
  276.             mthread_outlen = AV_RL32(encoded+4);
  277.             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
  278.             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
  279.             if (ret < 0) return ret;
  280.             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
  281.                               mthread_outlen, mthread_outlen);
  282.             if (ret < 0) return ret;
  283.         } else {
  284.             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
  285.             if (ret < 0) return ret;
  286.         }
  287.         encoded = c->decomp_buf;
  288.         len = c->decomp_size;
  289.         break;
  290. #endif
  291.     default:
  292.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
  293.         return AVERROR_INVALIDDATA;
  294.     }
  295.  
  296.  
  297.     /* Apply PNG filter */
  298.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
  299.         switch (c->imgtype) {
  300.         case IMGTYPE_YUV111:
  301.         case IMGTYPE_RGB24:
  302.             for (row = 0; row < height; row++) {
  303.                 pixel_ptr = row * width * 3;
  304.                 yq = encoded[pixel_ptr++];
  305.                 uqvq = AV_RL16(encoded+pixel_ptr);
  306.                 pixel_ptr += 2;
  307.                 for (col = 1; col < width; col++) {
  308.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  309.                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
  310.                     AV_WL16(encoded+pixel_ptr+1, uqvq);
  311.                     pixel_ptr += 3;
  312.                 }
  313.             }
  314.             break;
  315.         case IMGTYPE_YUV422:
  316.             for (row = 0; row < height; row++) {
  317.                 pixel_ptr = row * width * 2;
  318.                 yq = uq = vq =0;
  319.                 for (col = 0; col < width/4; col++) {
  320.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  321.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  322.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
  323.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
  324.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  325.                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
  326.                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
  327.                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
  328.                     pixel_ptr += 8;
  329.                 }
  330.             }
  331.             break;
  332.         case IMGTYPE_YUV411:
  333.             for (row = 0; row < height; row++) {
  334.                 pixel_ptr = row * width / 2 * 3;
  335.                 yq = uq = vq =0;
  336.                 for (col = 0; col < width/4; col++) {
  337.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  338.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  339.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
  340.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
  341.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  342.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
  343.                     pixel_ptr += 6;
  344.                 }
  345.             }
  346.             break;
  347.         case IMGTYPE_YUV211:
  348.             for (row = 0; row < height; row++) {
  349.                 pixel_ptr = row * width * 2;
  350.                 yq = uq = vq =0;
  351.                 for (col = 0; col < width/2; col++) {
  352.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  353.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  354.                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
  355.                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
  356.                     pixel_ptr += 4;
  357.                 }
  358.             }
  359.             break;
  360.         case IMGTYPE_YUV420:
  361.             for (row = 0; row < height/2; row++) {
  362.                 pixel_ptr = row * width * 3;
  363.                 yq = y1q = uq = vq =0;
  364.                 for (col = 0; col < width/2; col++) {
  365.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  366.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  367.                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
  368.                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
  369.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  370.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
  371.                     pixel_ptr += 6;
  372.                 }
  373.             }
  374.             break;
  375.         default:
  376.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
  377.             return AVERROR_INVALIDDATA;
  378.         }
  379.     }
  380.  
  381.     /* Convert colorspace */
  382.     y_out = frame->data[0] + (height - 1) * frame->linesize[0];
  383.     u_out = frame->data[1] + (height - 1) * frame->linesize[1];
  384.     v_out = frame->data[2] + (height - 1) * frame->linesize[2];
  385.     switch (c->imgtype) {
  386.     case IMGTYPE_YUV111:
  387.         for (row = 0; row < height; row++) {
  388.             for (col = 0; col < width; col++) {
  389.                 y_out[col] = *encoded++;
  390.                 u_out[col] = *encoded++ + 128;
  391.                 v_out[col] = *encoded++ + 128;
  392.             }
  393.             y_out -= frame->linesize[0];
  394.             u_out -= frame->linesize[1];
  395.             v_out -= frame->linesize[2];
  396.         }
  397.         break;
  398.     case IMGTYPE_YUV422:
  399.         for (row = 0; row < height; row++) {
  400.             for (col = 0; col < width - 3; col += 4) {
  401.                 memcpy(y_out + col, encoded, 4);
  402.                 encoded += 4;
  403.                 u_out[ col >> 1     ] = *encoded++ + 128;
  404.                 u_out[(col >> 1) + 1] = *encoded++ + 128;
  405.                 v_out[ col >> 1     ] = *encoded++ + 128;
  406.                 v_out[(col >> 1) + 1] = *encoded++ + 128;
  407.             }
  408.             y_out -= frame->linesize[0];
  409.             u_out -= frame->linesize[1];
  410.             v_out -= frame->linesize[2];
  411.         }
  412.         break;
  413.     case IMGTYPE_RGB24:
  414.         for (row = height - 1; row >= 0; row--) {
  415.             pixel_ptr = row * frame->linesize[0];
  416.             memcpy(outptr + pixel_ptr, encoded, 3 * width);
  417.             encoded += 3 * width;
  418.         }
  419.         break;
  420.     case IMGTYPE_YUV411:
  421.         for (row = 0; row < height; row++) {
  422.             for (col = 0; col < width - 3; col += 4) {
  423.                 memcpy(y_out + col, encoded, 4);
  424.                 encoded += 4;
  425.                 u_out[col >> 2] = *encoded++ + 128;
  426.                 v_out[col >> 2] = *encoded++ + 128;
  427.             }
  428.             y_out -= frame->linesize[0];
  429.             u_out -= frame->linesize[1];
  430.             v_out -= frame->linesize[2];
  431.         }
  432.         break;
  433.     case IMGTYPE_YUV211:
  434.         for (row = 0; row < height; row++) {
  435.             for (col = 0; col < width - 1; col += 2) {
  436.                 memcpy(y_out + col, encoded, 2);
  437.                 encoded += 2;
  438.                 u_out[col >> 1] = *encoded++ + 128;
  439.                 v_out[col >> 1] = *encoded++ + 128;
  440.             }
  441.             y_out -= frame->linesize[0];
  442.             u_out -= frame->linesize[1];
  443.             v_out -= frame->linesize[2];
  444.         }
  445.         break;
  446.     case IMGTYPE_YUV420:
  447.         u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
  448.         v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
  449.         for (row = 0; row < height - 1; row += 2) {
  450.             for (col = 0; col < width - 1; col += 2) {
  451.                 memcpy(y_out + col, encoded, 2);
  452.                 encoded += 2;
  453.                 memcpy(y_out + col - frame->linesize[0], encoded, 2);
  454.                 encoded += 2;
  455.                 u_out[col >> 1] = *encoded++ + 128;
  456.                 v_out[col >> 1] = *encoded++ + 128;
  457.             }
  458.             y_out -= frame->linesize[0] << 1;
  459.             u_out -= frame->linesize[1];
  460.             v_out -= frame->linesize[2];
  461.         }
  462.         break;
  463.     default:
  464.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
  465.         return AVERROR_INVALIDDATA;
  466.     }
  467.  
  468.     *got_frame = 1;
  469.  
  470.     /* always report that the buffer was completely consumed */
  471.     return buf_size;
  472. }
  473.  
  474. /*
  475.  *
  476.  * Init lcl decoder
  477.  *
  478.  */
  479. static av_cold int decode_init(AVCodecContext *avctx)
  480. {
  481.     LclDecContext * const c = avctx->priv_data;
  482.     unsigned int basesize = avctx->width * avctx->height;
  483.     unsigned int max_basesize = FFALIGN(avctx->width,  4) *
  484.                                 FFALIGN(avctx->height, 4);
  485.     unsigned int max_decomp_size;
  486.     int subsample_h, subsample_v;
  487.  
  488.     if (avctx->extradata_size < 8) {
  489.         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
  490.         return AVERROR_INVALIDDATA;
  491.     }
  492.  
  493.     /* Check codec type */
  494.     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
  495.         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
  496.         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
  497.     }
  498.  
  499.     /* Detect image type */
  500.     switch (c->imgtype = avctx->extradata[4]) {
  501.     case IMGTYPE_YUV111:
  502.         c->decomp_size = basesize * 3;
  503.         max_decomp_size = max_basesize * 3;
  504.         avctx->pix_fmt = AV_PIX_FMT_YUV444P;
  505.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
  506.         break;
  507.     case IMGTYPE_YUV422:
  508.         c->decomp_size = basesize * 2;
  509.         max_decomp_size = max_basesize * 2;
  510.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
  511.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
  512.         if (avctx->width % 4) {
  513.             avpriv_request_sample(avctx, "Unsupported dimensions\n");
  514.             return AVERROR_INVALIDDATA;
  515.         }
  516.         break;
  517.     case IMGTYPE_RGB24:
  518.         c->decomp_size = basesize * 3;
  519.         max_decomp_size = max_basesize * 3;
  520.         avctx->pix_fmt = AV_PIX_FMT_BGR24;
  521.         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
  522.         break;
  523.     case IMGTYPE_YUV411:
  524.         c->decomp_size = basesize / 2 * 3;
  525.         max_decomp_size = max_basesize / 2 * 3;
  526.         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
  527.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
  528.         break;
  529.     case IMGTYPE_YUV211:
  530.         c->decomp_size = basesize * 2;
  531.         max_decomp_size = max_basesize * 2;
  532.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
  533.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
  534.         break;
  535.     case IMGTYPE_YUV420:
  536.         c->decomp_size = basesize / 2 * 3;
  537.         max_decomp_size = max_basesize / 2 * 3;
  538.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  539.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
  540.         break;
  541.     default:
  542.         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
  543.         return AVERROR_INVALIDDATA;
  544.     }
  545.  
  546.     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
  547.     if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
  548.         avpriv_request_sample(avctx, "Unsupported dimensions\n");
  549.         return AVERROR_INVALIDDATA;
  550.     }
  551.  
  552.     /* Detect compression method */
  553.     c->compression = (int8_t)avctx->extradata[5];
  554.     switch (avctx->codec_id) {
  555.     case AV_CODEC_ID_MSZH:
  556.         switch (c->compression) {
  557.         case COMP_MSZH:
  558.             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
  559.             break;
  560.         case COMP_MSZH_NOCOMP:
  561.             c->decomp_size = 0;
  562.             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
  563.             break;
  564.         default:
  565.             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
  566.             return AVERROR_INVALIDDATA;
  567.         }
  568.         break;
  569. #if CONFIG_ZLIB_DECODER
  570.     case AV_CODEC_ID_ZLIB:
  571.         switch (c->compression) {
  572.         case COMP_ZLIB_HISPEED:
  573.             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
  574.             break;
  575.         case COMP_ZLIB_HICOMP:
  576.             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
  577.             break;
  578.         case COMP_ZLIB_NORMAL:
  579.             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
  580.             break;
  581.         default:
  582.             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
  583.                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
  584.                 return AVERROR_INVALIDDATA;
  585.             }
  586.             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
  587.         }
  588.         break;
  589. #endif
  590.     default:
  591.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
  592.         return AVERROR_INVALIDDATA;
  593.     }
  594.  
  595.     /* Allocate decompression buffer */
  596.     if (c->decomp_size) {
  597.         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
  598.             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
  599.             return AVERROR(ENOMEM);
  600.         }
  601.     }
  602.  
  603.     /* Detect flags */
  604.     c->flags = avctx->extradata[6];
  605.     if (c->flags & FLAG_MULTITHREAD)
  606.         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
  607.     if (c->flags & FLAG_NULLFRAME)
  608.         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
  609.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
  610.         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
  611.     if (c->flags & FLAGMASK_UNUSED)
  612.         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
  613.  
  614.     /* If needed init zlib */
  615. #if CONFIG_ZLIB_DECODER
  616.     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
  617.         int zret;
  618.         c->zstream.zalloc = Z_NULL;
  619.         c->zstream.zfree = Z_NULL;
  620.         c->zstream.opaque = Z_NULL;
  621.         zret = inflateInit(&c->zstream);
  622.         if (zret != Z_OK) {
  623.             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
  624.             av_freep(&c->decomp_buf);
  625.             return AVERROR_UNKNOWN;
  626.         }
  627.     }
  628. #endif
  629.  
  630.     return 0;
  631. }
  632.  
  633. /*
  634.  *
  635.  * Uninit lcl decoder
  636.  *
  637.  */
  638. static av_cold int decode_end(AVCodecContext *avctx)
  639. {
  640.     LclDecContext * const c = avctx->priv_data;
  641.  
  642.     av_freep(&c->decomp_buf);
  643. #if CONFIG_ZLIB_DECODER
  644.     if (avctx->codec_id == AV_CODEC_ID_ZLIB)
  645.         inflateEnd(&c->zstream);
  646. #endif
  647.  
  648.     return 0;
  649. }
  650.  
  651. #if CONFIG_MSZH_DECODER
  652. AVCodec ff_mszh_decoder = {
  653.     .name           = "mszh",
  654.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
  655.     .type           = AVMEDIA_TYPE_VIDEO,
  656.     .id             = AV_CODEC_ID_MSZH,
  657.     .priv_data_size = sizeof(LclDecContext),
  658.     .init           = decode_init,
  659.     .close          = decode_end,
  660.     .decode         = decode_frame,
  661.     .capabilities   = CODEC_CAP_DR1,
  662. };
  663. #endif
  664.  
  665. #if CONFIG_ZLIB_DECODER
  666. AVCodec ff_zlib_decoder = {
  667.     .name           = "zlib",
  668.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
  669.     .type           = AVMEDIA_TYPE_VIDEO,
  670.     .id             = AV_CODEC_ID_ZLIB,
  671.     .priv_data_size = sizeof(LclDecContext),
  672.     .init           = decode_init,
  673.     .close          = decode_end,
  674.     .decode         = decode_frame,
  675.     .capabilities   = CODEC_CAP_DR1,
  676. };
  677. #endif
  678.