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  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 int pixel_ptr;
  173.     int row, col;
  174.     unsigned char *encoded = avpkt->data, *outptr;
  175.     uint8_t *y_out, *u_out, *v_out;
  176.     unsigned int width = avctx->width; // Real image width
  177.     unsigned int height = avctx->height; // Real image height
  178.     unsigned int mszh_dlen;
  179.     unsigned char yq, y1q, uq, vq;
  180.     int uqvq, ret;
  181.     unsigned int mthread_inlen, mthread_outlen;
  182.     unsigned int len = buf_size;
  183.     int linesize;
  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 == FFALIGN(width * 3, 4) * height ||
  196.                 c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
  197.                 ;
  198.             } else if (c->flags & FLAG_MULTITHREAD) {
  199.                 mthread_inlen = AV_RL32(buf);
  200.                 if (len < 8) {
  201.                     av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
  202.                     return AVERROR_INVALIDDATA;
  203.                 }
  204.                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
  205.                 mthread_outlen = AV_RL32(buf + 4);
  206.                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
  207.                 mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
  208.                 if (mthread_outlen != mszh_dlen) {
  209.                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
  210.                            mthread_outlen, mszh_dlen);
  211.                     return AVERROR_INVALIDDATA;
  212.                 }
  213.                 mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
  214.                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
  215.                 if (mthread_outlen != mszh_dlen) {
  216.                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
  217.                            mthread_outlen, mszh_dlen);
  218.                     return AVERROR_INVALIDDATA;
  219.                 }
  220.                 encoded = c->decomp_buf;
  221.                 len = c->decomp_size;
  222.             } else {
  223.                 mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
  224.                 if (c->decomp_size != mszh_dlen) {
  225.                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
  226.                            c->decomp_size, mszh_dlen);
  227.                     return AVERROR_INVALIDDATA;
  228.                 }
  229.                 encoded = c->decomp_buf;
  230.                 len = mszh_dlen;
  231.             }
  232.             break;
  233.         case COMP_MSZH_NOCOMP: {
  234.             int bppx2;
  235.             switch (c->imgtype) {
  236.             case IMGTYPE_YUV111:
  237.             case IMGTYPE_RGB24:
  238.                 bppx2 = 6;
  239.                 break;
  240.             case IMGTYPE_YUV422:
  241.             case IMGTYPE_YUV211:
  242.                 bppx2 = 4;
  243.                 break;
  244.             case IMGTYPE_YUV411:
  245.             case IMGTYPE_YUV420:
  246.                 bppx2 = 3;
  247.                 break;
  248.             default:
  249.                 bppx2 = 0; // will error out below
  250.                 break;
  251.             }
  252.             if (len < ((width * height * bppx2) >> 1))
  253.                 return AVERROR_INVALIDDATA;
  254.             break;
  255.         }
  256.         default:
  257.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
  258.             return AVERROR_INVALIDDATA;
  259.         }
  260.         break;
  261. #if CONFIG_ZLIB_DECODER
  262.     case AV_CODEC_ID_ZLIB:
  263.         /* Using the original dll with normal compression (-1) and RGB format
  264.          * gives a file with ZLIB fourcc, but frame is really uncompressed.
  265.          * To be sure that's true check also frame size */
  266.         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
  267.             len == width * height * 3) {
  268.             if (c->flags & FLAG_PNGFILTER) {
  269.                 memcpy(c->decomp_buf, buf, len);
  270.                 encoded = c->decomp_buf;
  271.             } else {
  272.                 break;
  273.             }
  274.         } else if (c->flags & FLAG_MULTITHREAD) {
  275.             mthread_inlen = AV_RL32(buf);
  276.             mthread_inlen = FFMIN(mthread_inlen, len - 8);
  277.             mthread_outlen = AV_RL32(buf + 4);
  278.             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
  279.             ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
  280.             if (ret < 0) return ret;
  281.             ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
  282.                               mthread_outlen, mthread_outlen);
  283.             if (ret < 0) return ret;
  284.         } else {
  285.             int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
  286.             if (ret < 0) return ret;
  287.         }
  288.         encoded = c->decomp_buf;
  289.         len = c->decomp_size;
  290.         break;
  291. #endif
  292.     default:
  293.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
  294.         return AVERROR_INVALIDDATA;
  295.     }
  296.  
  297.  
  298.     /* Apply PNG filter */
  299.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
  300.         switch (c->imgtype) {
  301.         case IMGTYPE_YUV111:
  302.         case IMGTYPE_RGB24:
  303.             for (row = 0; row < height; row++) {
  304.                 pixel_ptr = row * width * 3;
  305.                 yq = encoded[pixel_ptr++];
  306.                 uqvq = AV_RL16(encoded+pixel_ptr);
  307.                 pixel_ptr += 2;
  308.                 for (col = 1; col < width; col++) {
  309.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  310.                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
  311.                     AV_WL16(encoded+pixel_ptr+1, uqvq);
  312.                     pixel_ptr += 3;
  313.                 }
  314.             }
  315.             break;
  316.         case IMGTYPE_YUV422:
  317.             for (row = 0; row < height; row++) {
  318.                 pixel_ptr = row * width * 2;
  319.                 yq = uq = vq =0;
  320.                 for (col = 0; col < width/4; col++) {
  321.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  322.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  323.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
  324.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
  325.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  326.                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
  327.                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
  328.                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
  329.                     pixel_ptr += 8;
  330.                 }
  331.             }
  332.             break;
  333.         case IMGTYPE_YUV411:
  334.             for (row = 0; row < height; row++) {
  335.                 pixel_ptr = row * width / 2 * 3;
  336.                 yq = uq = vq =0;
  337.                 for (col = 0; col < width/4; col++) {
  338.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  339.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  340.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
  341.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
  342.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  343.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
  344.                     pixel_ptr += 6;
  345.                 }
  346.             }
  347.             break;
  348.         case IMGTYPE_YUV211:
  349.             for (row = 0; row < height; row++) {
  350.                 pixel_ptr = row * width * 2;
  351.                 yq = uq = vq =0;
  352.                 for (col = 0; col < width/2; col++) {
  353.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  354.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  355.                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
  356.                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
  357.                     pixel_ptr += 4;
  358.                 }
  359.             }
  360.             break;
  361.         case IMGTYPE_YUV420:
  362.             for (row = 0; row < height/2; row++) {
  363.                 pixel_ptr = row * width * 3;
  364.                 yq = y1q = uq = vq =0;
  365.                 for (col = 0; col < width/2; col++) {
  366.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
  367.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
  368.                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
  369.                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
  370.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
  371.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
  372.                     pixel_ptr += 6;
  373.                 }
  374.             }
  375.             break;
  376.         default:
  377.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
  378.             return AVERROR_INVALIDDATA;
  379.         }
  380.     }
  381.  
  382.     /* Convert colorspace */
  383.     y_out = frame->data[0] + (height - 1) * frame->linesize[0];
  384.     u_out = frame->data[1] + (height - 1) * frame->linesize[1];
  385.     v_out = frame->data[2] + (height - 1) * frame->linesize[2];
  386.     switch (c->imgtype) {
  387.     case IMGTYPE_YUV111:
  388.         for (row = 0; row < height; row++) {
  389.             for (col = 0; col < width; col++) {
  390.                 y_out[col] = *encoded++;
  391.                 u_out[col] = *encoded++ + 128;
  392.                 v_out[col] = *encoded++ + 128;
  393.             }
  394.             y_out -= frame->linesize[0];
  395.             u_out -= frame->linesize[1];
  396.             v_out -= frame->linesize[2];
  397.         }
  398.         break;
  399.     case IMGTYPE_YUV422:
  400.         for (row = 0; row < height; row++) {
  401.             for (col = 0; col < width - 3; col += 4) {
  402.                 memcpy(y_out + col, encoded, 4);
  403.                 encoded += 4;
  404.                 u_out[ col >> 1     ] = *encoded++ + 128;
  405.                 u_out[(col >> 1) + 1] = *encoded++ + 128;
  406.                 v_out[ col >> 1     ] = *encoded++ + 128;
  407.                 v_out[(col >> 1) + 1] = *encoded++ + 128;
  408.             }
  409.             y_out -= frame->linesize[0];
  410.             u_out -= frame->linesize[1];
  411.             v_out -= frame->linesize[2];
  412.         }
  413.         break;
  414.     case IMGTYPE_RGB24:
  415.         linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
  416.         for (row = height - 1; row >= 0; row--) {
  417.             pixel_ptr = row * frame->linesize[0];
  418.             memcpy(outptr + pixel_ptr, encoded, 3 * width);
  419.             encoded += linesize;
  420.         }
  421.         break;
  422.     case IMGTYPE_YUV411:
  423.         for (row = 0; row < height; row++) {
  424.             for (col = 0; col < width - 3; col += 4) {
  425.                 memcpy(y_out + col, encoded, 4);
  426.                 encoded += 4;
  427.                 u_out[col >> 2] = *encoded++ + 128;
  428.                 v_out[col >> 2] = *encoded++ + 128;
  429.             }
  430.             y_out -= frame->linesize[0];
  431.             u_out -= frame->linesize[1];
  432.             v_out -= frame->linesize[2];
  433.         }
  434.         break;
  435.     case IMGTYPE_YUV211:
  436.         for (row = 0; row < height; row++) {
  437.             for (col = 0; col < width - 1; col += 2) {
  438.                 memcpy(y_out + col, encoded, 2);
  439.                 encoded += 2;
  440.                 u_out[col >> 1] = *encoded++ + 128;
  441.                 v_out[col >> 1] = *encoded++ + 128;
  442.             }
  443.             y_out -= frame->linesize[0];
  444.             u_out -= frame->linesize[1];
  445.             v_out -= frame->linesize[2];
  446.         }
  447.         break;
  448.     case IMGTYPE_YUV420:
  449.         u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
  450.         v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
  451.         for (row = 0; row < height - 1; row += 2) {
  452.             for (col = 0; col < width - 1; col += 2) {
  453.                 memcpy(y_out + col, encoded, 2);
  454.                 encoded += 2;
  455.                 memcpy(y_out + col - frame->linesize[0], encoded, 2);
  456.                 encoded += 2;
  457.                 u_out[col >> 1] = *encoded++ + 128;
  458.                 v_out[col >> 1] = *encoded++ + 128;
  459.             }
  460.             y_out -= frame->linesize[0] << 1;
  461.             u_out -= frame->linesize[1];
  462.             v_out -= frame->linesize[2];
  463.         }
  464.         break;
  465.     default:
  466.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
  467.         return AVERROR_INVALIDDATA;
  468.     }
  469.  
  470.     *got_frame = 1;
  471.  
  472.     /* always report that the buffer was completely consumed */
  473.     return buf_size;
  474. }
  475.  
  476. /*
  477.  *
  478.  * Init lcl decoder
  479.  *
  480.  */
  481. static av_cold int decode_init(AVCodecContext *avctx)
  482. {
  483.     LclDecContext * const c = avctx->priv_data;
  484.     unsigned int basesize = avctx->width * avctx->height;
  485.     unsigned int max_basesize = FFALIGN(avctx->width,  4) *
  486.                                 FFALIGN(avctx->height, 4);
  487.     unsigned int max_decomp_size;
  488.     int subsample_h, subsample_v;
  489.  
  490.     if (avctx->extradata_size < 8) {
  491.         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
  492.         return AVERROR_INVALIDDATA;
  493.     }
  494.  
  495.     /* Check codec type */
  496.     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
  497.         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
  498.         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
  499.     }
  500.  
  501.     /* Detect image type */
  502.     switch (c->imgtype = avctx->extradata[4]) {
  503.     case IMGTYPE_YUV111:
  504.         c->decomp_size = basesize * 3;
  505.         max_decomp_size = max_basesize * 3;
  506.         avctx->pix_fmt = AV_PIX_FMT_YUV444P;
  507.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
  508.         break;
  509.     case IMGTYPE_YUV422:
  510.         c->decomp_size = basesize * 2;
  511.         max_decomp_size = max_basesize * 2;
  512.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
  513.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
  514.         if (avctx->width % 4) {
  515.             avpriv_request_sample(avctx, "Unsupported dimensions");
  516.             return AVERROR_INVALIDDATA;
  517.         }
  518.         break;
  519.     case IMGTYPE_RGB24:
  520.         c->decomp_size = basesize * 3;
  521.         max_decomp_size = max_basesize * 3;
  522.         avctx->pix_fmt = AV_PIX_FMT_BGR24;
  523.         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
  524.         break;
  525.     case IMGTYPE_YUV411:
  526.         c->decomp_size = basesize / 2 * 3;
  527.         max_decomp_size = max_basesize / 2 * 3;
  528.         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
  529.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
  530.         break;
  531.     case IMGTYPE_YUV211:
  532.         c->decomp_size = basesize * 2;
  533.         max_decomp_size = max_basesize * 2;
  534.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
  535.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
  536.         break;
  537.     case IMGTYPE_YUV420:
  538.         c->decomp_size = basesize / 2 * 3;
  539.         max_decomp_size = max_basesize / 2 * 3;
  540.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  541.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
  542.         break;
  543.     default:
  544.         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
  545.         return AVERROR_INVALIDDATA;
  546.     }
  547.  
  548.     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
  549.     if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
  550.         avpriv_request_sample(avctx, "Unsupported dimensions");
  551.         return AVERROR_INVALIDDATA;
  552.     }
  553.  
  554.     /* Detect compression method */
  555.     c->compression = (int8_t)avctx->extradata[5];
  556.     switch (avctx->codec_id) {
  557.     case AV_CODEC_ID_MSZH:
  558.         switch (c->compression) {
  559.         case COMP_MSZH:
  560.             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
  561.             break;
  562.         case COMP_MSZH_NOCOMP:
  563.             c->decomp_size = 0;
  564.             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
  565.             break;
  566.         default:
  567.             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
  568.             return AVERROR_INVALIDDATA;
  569.         }
  570.         break;
  571. #if CONFIG_ZLIB_DECODER
  572.     case AV_CODEC_ID_ZLIB:
  573.         switch (c->compression) {
  574.         case COMP_ZLIB_HISPEED:
  575.             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
  576.             break;
  577.         case COMP_ZLIB_HICOMP:
  578.             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
  579.             break;
  580.         case COMP_ZLIB_NORMAL:
  581.             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
  582.             break;
  583.         default:
  584.             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
  585.                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
  586.                 return AVERROR_INVALIDDATA;
  587.             }
  588.             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
  589.         }
  590.         break;
  591. #endif
  592.     default:
  593.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
  594.         return AVERROR_INVALIDDATA;
  595.     }
  596.  
  597.     /* Allocate decompression buffer */
  598.     if (c->decomp_size) {
  599.         if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
  600.             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
  601.             return AVERROR(ENOMEM);
  602.         }
  603.     }
  604.  
  605.     /* Detect flags */
  606.     c->flags = avctx->extradata[6];
  607.     if (c->flags & FLAG_MULTITHREAD)
  608.         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
  609.     if (c->flags & FLAG_NULLFRAME)
  610.         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
  611.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
  612.         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
  613.     if (c->flags & FLAGMASK_UNUSED)
  614.         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
  615.  
  616.     /* If needed init zlib */
  617. #if CONFIG_ZLIB_DECODER
  618.     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
  619.         int zret;
  620.         c->zstream.zalloc = Z_NULL;
  621.         c->zstream.zfree = Z_NULL;
  622.         c->zstream.opaque = Z_NULL;
  623.         zret = inflateInit(&c->zstream);
  624.         if (zret != Z_OK) {
  625.             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
  626.             av_freep(&c->decomp_buf);
  627.             return AVERROR_UNKNOWN;
  628.         }
  629.     }
  630. #endif
  631.  
  632.     return 0;
  633. }
  634.  
  635. /*
  636.  *
  637.  * Uninit lcl decoder
  638.  *
  639.  */
  640. static av_cold int decode_end(AVCodecContext *avctx)
  641. {
  642.     LclDecContext * const c = avctx->priv_data;
  643.  
  644.     av_freep(&c->decomp_buf);
  645. #if CONFIG_ZLIB_DECODER
  646.     if (avctx->codec_id == AV_CODEC_ID_ZLIB)
  647.         inflateEnd(&c->zstream);
  648. #endif
  649.  
  650.     return 0;
  651. }
  652.  
  653. #if CONFIG_MSZH_DECODER
  654. AVCodec ff_mszh_decoder = {
  655.     .name           = "mszh",
  656.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
  657.     .type           = AVMEDIA_TYPE_VIDEO,
  658.     .id             = AV_CODEC_ID_MSZH,
  659.     .priv_data_size = sizeof(LclDecContext),
  660.     .init           = decode_init,
  661.     .close          = decode_end,
  662.     .decode         = decode_frame,
  663.     .capabilities   = AV_CODEC_CAP_DR1,
  664. };
  665. #endif
  666.  
  667. #if CONFIG_ZLIB_DECODER
  668. AVCodec ff_zlib_decoder = {
  669.     .name           = "zlib",
  670.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
  671.     .type           = AVMEDIA_TYPE_VIDEO,
  672.     .id             = AV_CODEC_ID_ZLIB,
  673.     .priv_data_size = sizeof(LclDecContext),
  674.     .init           = decode_init,
  675.     .close          = decode_end,
  676.     .decode         = decode_frame,
  677.     .capabilities   = AV_CODEC_CAP_DR1,
  678. };
  679. #endif
  680.