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FFmpeg/libavcodec/lcldec.c

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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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 "avcodec.h"

  46. #include "bytestream.h"

  47. #include "internal.h"

  48. #include "lcl.h"

  49. 

  50. #if CONFIG_ZLIB_DECODER

  51. #include <zlib.h>

  52. #endif

  53. 

  54. /*

  55.  * Decoder context

  56.  */

  57. typedef struct LclDecContext {

  58.     // Image type

  59.     int imgtype;

  60.     // Compression type

  61.     int compression;

  62.     // Flags

  63.     int flags;

  64.     // Decompressed data size

  65.     unsigned int decomp_size;

  66.     // Decompression buffer

  67.     unsigned char* decomp_buf;

  68. #if CONFIG_ZLIB_DECODER

  69.     z_stream zstream;

  70. #endif

  71. } LclDecContext;

  72. 

  73. 

  74. /**

  75.  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes

  76.  * @param destptr must be padded sufficiently for av_memcpy_backptr

  77.  */

  78. static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)

  79. {

  80.     unsigned char *destptr_bak = destptr;

  81.     unsigned char *destptr_end = destptr + destsize;

  82.     const unsigned char *srcptr_end = srcptr + srclen;

  83.     unsigned mask = *srcptr++;

  84.     unsigned maskbit = 0x80;

  85. 

  86.     while (srcptr < srcptr_end && destptr < destptr_end) {

  87.         if (!(mask & maskbit)) {

  88.             memcpy(destptr, srcptr, 4);

  89.             destptr += 4;

  90.             srcptr += 4;

  91.         } else {

  92.             unsigned ofs = bytestream_get_le16(&srcptr);

  93.             unsigned cnt = (ofs >> 11) + 1;

  94.             ofs &= 0x7ff;

  95.             ofs = FFMIN(ofs, destptr - destptr_bak);

  96.             cnt *= 4;

  97.             cnt = FFMIN(cnt, destptr_end - destptr);

  98.             av_memcpy_backptr(destptr, ofs, cnt);

  99.             destptr += cnt;

  100.         }

  101.         maskbit >>= 1;

  102.         if (!maskbit) {

  103.             mask = *srcptr++;

  104.             while (!mask) {

  105.                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;

  106.                 memcpy(destptr, srcptr, 32);

  107.                 destptr += 32;

  108.                 srcptr += 32;

  109.                 mask = *srcptr++;

  110.             }

  111.             maskbit = 0x80;

  112.         }

  113.     }

  114. 

  115.     return destptr - destptr_bak;

  116. }

  117. 

  118. 

  119. #if CONFIG_ZLIB_DECODER

  120. /**

  121.  * @brief decompress a zlib-compressed data block into decomp_buf

  122.  * @param src compressed input buffer

  123.  * @param src_len data length in input buffer

  124.  * @param offset offset in decomp_buf

  125.  * @param expected expected decompressed length

  126.  */

  127. static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)

  128. {

  129.     LclDecContext *c = avctx->priv_data;

  130.     int zret = inflateReset(&c->zstream);

  131.     if (zret != Z_OK) {

  132.         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);

  133.         return AVERROR_UNKNOWN;

  134.     }

  135.     c->zstream.next_in = src;

  136.     c->zstream.avail_in = src_len;

  137.     c->zstream.next_out = c->decomp_buf + offset;

  138.     c->zstream.avail_out = c->decomp_size - offset;

  139.     zret = inflate(&c->zstream, Z_FINISH);

  140.     if (zret != Z_OK && zret != Z_STREAM_END) {

  141.         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);

  142.         return AVERROR_UNKNOWN;

  143.     }

  144.     if (expected != (unsigned int)c->zstream.total_out) {

  145.         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",

  146.                expected, c->zstream.total_out);

  147.         return AVERROR_UNKNOWN;

  148.     }

  149.     return c->zstream.total_out;

  150. }

  151. #endif

  152. 

  153. 

  154. /*

  155.  *

  156.  * Decode a frame

  157.  *

  158.  */

  159. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

  160. {

  161.     AVFrame *frame = data;

  162.     const uint8_t *buf = avpkt->data;

  163.     int buf_size = avpkt->size;

  164.     LclDecContext * const c = avctx->priv_data;

  165.     unsigned char *encoded = (unsigned char *)buf;

  166.     unsigned int pixel_ptr;

  167.     int row, col;

  168.     unsigned char *outptr;

  169.     uint8_t *y_out, *u_out, *v_out;

  170.     unsigned int width = avctx->width; // Real image width

  171.     unsigned int height = avctx->height; // Real image height

  172.     unsigned int mszh_dlen;

  173.     unsigned char yq, y1q, uq, vq;

  174.     int uqvq, ret;

  175.     unsigned int mthread_inlen, mthread_outlen;

  176.     unsigned int len = buf_size;

  177. 

  178.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {

  179.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  180.         return ret;

  181.     }

  182. 

  183.     outptr = frame->data[0]; // Output image pointer

  184. 

  185.     /* Decompress frame */

  186.     switch (avctx->codec_id) {

  187.     case AV_CODEC_ID_MSZH:

  188.         switch (c->compression) {

  189.         case COMP_MSZH:

  190.             if (c->flags & FLAG_MULTITHREAD) {

  191.                 mthread_inlen = AV_RL32(encoded);

  192.                 mthread_inlen = FFMIN(mthread_inlen, len - 8);

  193.                 mthread_outlen = AV_RL32(encoded+4);

  194.                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);

  195.                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);

  196.                 if (mthread_outlen != mszh_dlen) {

  197.                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",

  198.                            mthread_outlen, mszh_dlen);

  199.                     return AVERROR_INVALIDDATA;

  200.                 }

  201.                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,

  202.                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);

  203.                 if (mthread_outlen != mszh_dlen) {

  204.                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",

  205.                            mthread_outlen, mszh_dlen);

  206.                     return AVERROR_INVALIDDATA;

  207.                 }

  208.                 encoded = c->decomp_buf;

  209.                 len = c->decomp_size;

  210.             } else {

  211.                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);

  212.                 if (c->decomp_size != mszh_dlen) {

  213.                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",

  214.                            c->decomp_size, mszh_dlen);

  215.                     return AVERROR_INVALIDDATA;

  216.                 }

  217.                 encoded = c->decomp_buf;

  218.                 len = mszh_dlen;

  219.             }

  220.             break;

  221.         case COMP_MSZH_NOCOMP: {

  222.             int bppx2;

  223.             switch (c->imgtype) {

  224.             case IMGTYPE_YUV111:

  225.             case IMGTYPE_RGB24:

  226.                 bppx2 = 6;

  227.                 break;

  228.             case IMGTYPE_YUV422:

  229.             case IMGTYPE_YUV211:

  230.                 bppx2 = 4;

  231.                 break;

  232.             case IMGTYPE_YUV411:

  233.             case IMGTYPE_YUV420:

  234.                 bppx2 = 3;

  235.                 break;

  236.             default:

  237.                 bppx2 = 0; // will error out below

  238.                 break;

  239.             }

  240.             if (len < ((width * height * bppx2) >> 1))

  241.                 return AVERROR_INVALIDDATA;

  242.             break;

  243.         }

  244.         default:

  245.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");

  246.             return AVERROR_INVALIDDATA;

  247.         }

  248.         break;

  249. #if CONFIG_ZLIB_DECODER

  250.     case AV_CODEC_ID_ZLIB:

  251.         /* Using the original dll with normal compression (-1) and RGB format

  252.          * gives a file with ZLIB fourcc, but frame is really uncompressed.

  253.          * To be sure that's true check also frame size */

  254.         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&

  255.             len == width * height * 3) {

  256.             if (c->flags & FLAG_PNGFILTER) {

  257.                 memcpy(c->decomp_buf, encoded, len);

  258.                 encoded = c->decomp_buf;

  259.             } else {

  260.                 break;

  261.             }

  262.         } else if (c->flags & FLAG_MULTITHREAD) {

  263.             mthread_inlen = AV_RL32(encoded);

  264.             mthread_inlen = FFMIN(mthread_inlen, len - 8);

  265.             mthread_outlen = AV_RL32(encoded+4);

  266.             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);

  267.             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);

  268.             if (ret < 0) return ret;

  269.             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,

  270.                               mthread_outlen, mthread_outlen);

  271.             if (ret < 0) return ret;

  272.         } else {

  273.             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);

  274.             if (ret < 0) return ret;

  275.         }

  276.         encoded = c->decomp_buf;

  277.         len = c->decomp_size;

  278.         break;

  279. #endif

  280.     default:

  281.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");

  282.         return AVERROR_INVALIDDATA;

  283.     }

  284. 

  285. 

  286.     /* Apply PNG filter */

  287.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {

  288.         switch (c->imgtype) {

  289.         case IMGTYPE_YUV111:

  290.         case IMGTYPE_RGB24:

  291.             for (row = 0; row < height; row++) {

  292.                 pixel_ptr = row * width * 3;

  293.                 yq = encoded[pixel_ptr++];

  294.                 uqvq = AV_RL16(encoded+pixel_ptr);

  295.                 pixel_ptr += 2;

  296.                 for (col = 1; col < width; col++) {

  297.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];

  298.                     uqvq -= AV_RL16(encoded+pixel_ptr+1);

  299.                     AV_WL16(encoded+pixel_ptr+1, uqvq);

  300.                     pixel_ptr += 3;

  301.                 }

  302.             }

  303.             break;

  304.         case IMGTYPE_YUV422:

  305.             for (row = 0; row < height; row++) {

  306.                 pixel_ptr = row * width * 2;

  307.                 yq = uq = vq =0;

  308.                 for (col = 0; col < width/4; col++) {

  309.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];

  310.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];

  311.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];

  312.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];

  313.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];

  314.                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];

  315.                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];

  316.                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];

  317.                     pixel_ptr += 8;

  318.                 }

  319.             }

  320.             break;

  321.         case IMGTYPE_YUV411:

  322.             for (row = 0; row < height; row++) {

  323.                 pixel_ptr = row * width / 2 * 3;

  324.                 yq = uq = vq =0;

  325.                 for (col = 0; col < width/4; col++) {

  326.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];

  327.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];

  328.                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];

  329.                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];

  330.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];

  331.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];

  332.                     pixel_ptr += 6;

  333.                 }

  334.             }

  335.             break;

  336.         case IMGTYPE_YUV211:

  337.             for (row = 0; row < height; row++) {

  338.                 pixel_ptr = row * width * 2;

  339.                 yq = uq = vq =0;

  340.                 for (col = 0; col < width/2; col++) {

  341.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];

  342.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];

  343.                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];

  344.                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];

  345.                     pixel_ptr += 4;

  346.                 }

  347.             }

  348.             break;

  349.         case IMGTYPE_YUV420:

  350.             for (row = 0; row < height/2; row++) {

  351.                 pixel_ptr = row * width * 3;

  352.                 yq = y1q = uq = vq =0;

  353.                 for (col = 0; col < width/2; col++) {

  354.                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];

  355.                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];

  356.                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];

  357.                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];

  358.                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];

  359.                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];

  360.                     pixel_ptr += 6;

  361.                 }

  362.             }

  363.             break;

  364.         default:

  365.             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");

  366.             return AVERROR_INVALIDDATA;

  367.         }

  368.     }

  369. 

  370.     /* Convert colorspace */

  371.     y_out = frame->data[0] + (height - 1) * frame->linesize[0];

  372.     u_out = frame->data[1] + (height - 1) * frame->linesize[1];

  373.     v_out = frame->data[2] + (height - 1) * frame->linesize[2];

  374.     switch (c->imgtype) {

  375.     case IMGTYPE_YUV111:

  376.         for (row = 0; row < height; row++) {

  377.             for (col = 0; col < width; col++) {

  378.                 y_out[col] = *encoded++;

  379.                 u_out[col] = *encoded++ + 128;

  380.                 v_out[col] = *encoded++ + 128;

  381.             }

  382.             y_out -= frame->linesize[0];

  383.             u_out -= frame->linesize[1];

  384.             v_out -= frame->linesize[2];

  385.         }

  386.         break;

  387.     case IMGTYPE_YUV422:

  388.         for (row = 0; row < height; row++) {

  389.             for (col = 0; col < width - 3; col += 4) {

  390.                 memcpy(y_out + col, encoded, 4);

  391.                 encoded += 4;

  392.                 u_out[ col >> 1     ] = *encoded++ + 128;

  393.                 u_out[(col >> 1) + 1] = *encoded++ + 128;

  394.                 v_out[ col >> 1     ] = *encoded++ + 128;

  395.                 v_out[(col >> 1) + 1] = *encoded++ + 128;

  396.             }

  397.             y_out -= frame->linesize[0];

  398.             u_out -= frame->linesize[1];

  399.             v_out -= frame->linesize[2];

  400.         }

  401.         break;

  402.     case IMGTYPE_RGB24:

  403.         for (row = height - 1; row >= 0; row--) {

  404.             pixel_ptr = row * frame->linesize[0];

  405.             memcpy(outptr + pixel_ptr, encoded, 3 * width);

  406.             encoded += 3 * width;

  407.         }

  408.         break;

  409.     case IMGTYPE_YUV411:

  410.         for (row = 0; row < height; row++) {

  411.             for (col = 0; col < width - 3; col += 4) {

  412.                 memcpy(y_out + col, encoded, 4);

  413.                 encoded += 4;

  414.                 u_out[col >> 2] = *encoded++ + 128;

  415.                 v_out[col >> 2] = *encoded++ + 128;

  416.             }

  417.             y_out -= frame->linesize[0];

  418.             u_out -= frame->linesize[1];

  419.             v_out -= frame->linesize[2];

  420.         }

  421.         break;

  422.     case IMGTYPE_YUV211:

  423.         for (row = 0; row < height; row++) {

  424.             for (col = 0; col < width - 1; col += 2) {

  425.                 memcpy(y_out + col, encoded, 2);

  426.                 encoded += 2;

  427.                 u_out[col >> 1] = *encoded++ + 128;

  428.                 v_out[col >> 1] = *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_YUV420:

  436.         u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];

  437.         v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];

  438.         for (row = 0; row < height - 1; row += 2) {

  439.             for (col = 0; col < width - 1; col += 2) {

  440.                 memcpy(y_out + col, encoded, 2);

  441.                 encoded += 2;

  442.                 memcpy(y_out + col - frame->linesize[0], encoded, 2);

  443.                 encoded += 2;

  444.                 u_out[col >> 1] = *encoded++ + 128;

  445.                 v_out[col >> 1] = *encoded++ + 128;

  446.             }

  447.             y_out -= frame->linesize[0] << 1;

  448.             u_out -= frame->linesize[1];

  449.             v_out -= frame->linesize[2];

  450.         }

  451.         break;

  452.     default:

  453.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");

  454.         return AVERROR_INVALIDDATA;

  455.     }

  456. 

  457.     *got_frame = 1;

  458. 

  459.     /* always report that the buffer was completely consumed */

  460.     return buf_size;

  461. }

  462. 

  463. /*

  464.  *

  465.  * Init lcl decoder

  466.  *

  467.  */

  468. static av_cold int decode_init(AVCodecContext *avctx)

  469. {

  470.     LclDecContext * const c = avctx->priv_data;

  471.     unsigned int basesize = avctx->width * avctx->height;

  472.     unsigned int max_basesize = FFALIGN(avctx->width,  4) *

  473.                                 FFALIGN(avctx->height, 4);

  474.     unsigned int max_decomp_size;

  475. 

  476.     if (avctx->extradata_size < 8) {

  477.         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");

  478.         return AVERROR_INVALIDDATA;

  479.     }

  480. 

  481.     /* Check codec type */

  482.     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||

  483.         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {

  484.         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");

  485.     }

  486. 

  487.     /* Detect image type */

  488.     switch (c->imgtype = avctx->extradata[4]) {

  489.     case IMGTYPE_YUV111:

  490.         c->decomp_size = basesize * 3;

  491.         max_decomp_size = max_basesize * 3;

  492.         avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  493.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");

  494.         break;

  495.     case IMGTYPE_YUV422:

  496.         c->decomp_size = basesize * 2;

  497.         max_decomp_size = max_basesize * 2;

  498.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  499.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");

  500.         break;

  501.     case IMGTYPE_RGB24:

  502.         c->decomp_size = basesize * 3;

  503.         max_decomp_size = max_basesize * 3;

  504.         avctx->pix_fmt = AV_PIX_FMT_BGR24;

  505.         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");

  506.         break;

  507.     case IMGTYPE_YUV411:

  508.         c->decomp_size = basesize / 2 * 3;

  509.         max_decomp_size = max_basesize / 2 * 3;

  510.         avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  511.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");

  512.         break;

  513.     case IMGTYPE_YUV211:

  514.         c->decomp_size = basesize * 2;

  515.         max_decomp_size = max_basesize * 2;

  516.         avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  517.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");

  518.         break;

  519.     case IMGTYPE_YUV420:

  520.         c->decomp_size = basesize / 2 * 3;

  521.         max_decomp_size = max_basesize / 2 * 3;

  522.         avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  523.         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");

  524.         break;

  525.     default:

  526.         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);

  527.         return AVERROR_INVALIDDATA;

  528.     }

  529. 

  530.     /* Detect compression method */

  531.     c->compression = (int8_t)avctx->extradata[5];

  532.     switch (avctx->codec_id) {

  533.     case AV_CODEC_ID_MSZH:

  534.         switch (c->compression) {

  535.         case COMP_MSZH:

  536.             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");

  537.             break;

  538.         case COMP_MSZH_NOCOMP:

  539.             c->decomp_size = 0;

  540.             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");

  541.             break;

  542.         default:

  543.             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);

  544.             return AVERROR_INVALIDDATA;

  545.         }

  546.         break;

  547. #if CONFIG_ZLIB_DECODER

  548.     case AV_CODEC_ID_ZLIB:

  549.         switch (c->compression) {

  550.         case COMP_ZLIB_HISPEED:

  551.             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");

  552.             break;

  553.         case COMP_ZLIB_HICOMP:

  554.             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");

  555.             break;

  556.         case COMP_ZLIB_NORMAL:

  557.             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");

  558.             break;

  559.         default:

  560.             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {

  561.                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);

  562.                 return AVERROR_INVALIDDATA;

  563.             }

  564.             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);

  565.         }

  566.         break;

  567. #endif

  568.     default:

  569.         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");

  570.         return AVERROR_INVALIDDATA;

  571.     }

  572. 

  573.     /* Allocate decompression buffer */

  574.     if (c->decomp_size) {

  575.         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {

  576.             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");

  577.             return AVERROR(ENOMEM);

  578.         }

  579.     }

  580. 

  581.     /* Detect flags */

  582.     c->flags = avctx->extradata[6];

  583.     if (c->flags & FLAG_MULTITHREAD)

  584.         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");

  585.     if (c->flags & FLAG_NULLFRAME)

  586.         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");

  587.     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))

  588.         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");

  589.     if (c->flags & FLAGMASK_UNUSED)

  590.         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);

  591. 

  592.     /* If needed init zlib */

  593. #if CONFIG_ZLIB_DECODER

  594.     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {

  595.         int zret;

  596.         c->zstream.zalloc = Z_NULL;

  597.         c->zstream.zfree = Z_NULL;

  598.         c->zstream.opaque = Z_NULL;

  599.         zret = inflateInit(&c->zstream);

  600.         if (zret != Z_OK) {

  601.             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

  602.             av_freep(&c->decomp_buf);

  603.             return AVERROR_UNKNOWN;

  604.         }

  605.     }

  606. #endif

  607. 

  608.     return 0;

  609. }

  610. 

  611. /*

  612.  *

  613.  * Uninit lcl decoder

  614.  *

  615.  */

  616. static av_cold int decode_end(AVCodecContext *avctx)

  617. {

  618.     LclDecContext * const c = avctx->priv_data;

  619. 

  620.     av_freep(&c->decomp_buf);

  621. #if CONFIG_ZLIB_DECODER

  622.     if (avctx->codec_id == AV_CODEC_ID_ZLIB)

  623.         inflateEnd(&c->zstream);

  624. #endif

  625. 

  626.     return 0;

  627. }

  628. 

  629. #if CONFIG_MSZH_DECODER

  630. AVCodec ff_mszh_decoder = {

  631.     .name           = "mszh",

  632.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),

  633.     .type           = AVMEDIA_TYPE_VIDEO,

  634.     .id             = AV_CODEC_ID_MSZH,

  635.     .priv_data_size = sizeof(LclDecContext),

  636.     .init           = decode_init,

  637.     .close          = decode_end,

  638.     .decode         = decode_frame,

  639.     .capabilities   = CODEC_CAP_DR1,

  640. };

  641. #endif

  642. 

  643. #if CONFIG_ZLIB_DECODER

  644. AVCodec ff_zlib_decoder = {

  645.     .name           = "zlib",

  646.     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),

  647.     .type           = AVMEDIA_TYPE_VIDEO,

  648.     .id             = AV_CODEC_ID_ZLIB,

  649.     .priv_data_size = sizeof(LclDecContext),

  650.     .init           = decode_init,

  651.     .close          = decode_end,

  652.     .decode         = decode_frame,

  653.     .capabilities   = CODEC_CAP_DR1,

  654. };

  655. #endif