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FFmpeg/libavcodec/lcl.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 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. /**

  24.  * @file lcl.c

  25.  * LCL (LossLess Codec Library) Video Codec

  26.  * Decoder for MSZH and ZLIB codecs

  27.  * Experimental encoder for ZLIB RGB24

  28.  *

  29.  * Fourcc: MSZH, ZLIB

  30.  *

  31.  * Original Win32 dll:

  32.  * Ver2.23 By Kenji Oshima 2000.09.20

  33.  * avimszh.dll, avizlib.dll

  34.  *

  35.  * A description of the decoding algorithm can be found here:

  36.  *   http://www.pcisys.net/~melanson/codecs

  37.  *

  38.  * Supports: BGR24 (RGB 24bpp)

  39.  *

  40.  */

  41. 

  42. #include <stdio.h>

  43. #include <stdlib.h>

  44. 

  45. #include "avcodec.h"

  46. #include "bitstream.h"

  47. 

  48. #ifdef CONFIG_ZLIB

  49. #include <zlib.h>

  50. #endif

  51. 

  52. 

  53. #define BMPTYPE_YUV 1

  54. #define BMPTYPE_RGB 2

  55. 

  56. #define IMGTYPE_YUV111 0

  57. #define IMGTYPE_YUV422 1

  58. #define IMGTYPE_RGB24 2

  59. #define IMGTYPE_YUV411 3

  60. #define IMGTYPE_YUV211 4

  61. #define IMGTYPE_YUV420 5

  62. 

  63. #define COMP_MSZH 0

  64. #define COMP_MSZH_NOCOMP 1

  65. #define COMP_ZLIB_HISPEED 1

  66. #define COMP_ZLIB_HICOMP 9

  67. #define COMP_ZLIB_NORMAL -1

  68. 

  69. #define FLAG_MULTITHREAD 1

  70. #define FLAG_NULLFRAME 2

  71. #define FLAG_PNGFILTER 4

  72. #define FLAGMASK_UNUSED 0xf8

  73. 

  74. #define CODEC_MSZH 1

  75. #define CODEC_ZLIB 3

  76. 

  77. #define FOURCC_MSZH mmioFOURCC('M','S','Z','H')

  78. #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')

  79. 

  80. /*

  81.  * Decoder context

  82.  */

  83. typedef struct LclContext {

  84. 

  85.         AVCodecContext *avctx;

  86.         AVFrame pic;

  87.     PutBitContext pb;

  88. 

  89.     // Image type

  90.     int imgtype;

  91.     // Compression type

  92.     int compression;

  93.     // Flags

  94.     int flags;

  95.     // Decompressed data size

  96.     unsigned int decomp_size;

  97.     // Decompression buffer

  98.     unsigned char* decomp_buf;

  99.     // Maximum compressed data size

  100.     unsigned int max_comp_size;

  101.     // Compression buffer

  102.     unsigned char* comp_buf;

  103. #ifdef CONFIG_ZLIB

  104.     z_stream zstream;

  105. #endif

  106. } LclContext;

  107. 

  108. 

  109. /*

  110.  *

  111.  * Helper functions

  112.  *

  113.  */

  114. static inline unsigned char fix (int pix14)

  115. {

  116.     int tmp;

  117. 

  118.     tmp = (pix14 + 0x80000) >> 20;

  119.     if (tmp < 0)

  120.         return 0;

  121.     if (tmp > 255)

  122.         return 255;

  123.     return tmp;

  124. }

  125. 

  126. 

  127. 

  128. static inline unsigned char get_b (unsigned char yq, signed char bq)

  129. {

  130.     return fix((yq << 20) + bq * 1858076);

  131. }

  132. 

  133. 

  134. 

  135. static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)

  136. {

  137.     return fix((yq << 20) - bq * 360857 - rq * 748830);

  138. }

  139. 

  140. 

  141. 

  142. static inline unsigned char get_r (unsigned char yq, signed char rq)

  143. {

  144.     return fix((yq << 20) + rq * 1470103);

  145. }

  146. 

  147. 

  148. 

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

  150. {

  151.     unsigned char *destptr_bak = destptr;

  152.     unsigned char *destptr_end = destptr + destsize;

  153.     unsigned char mask = 0;

  154.     unsigned char maskbit = 0;

  155.     unsigned int ofs, cnt;

  156. 

  157.     while ((srclen > 0) && (destptr < destptr_end)) {

  158.         if (maskbit == 0) {

  159.             mask = *(srcptr++);

  160.             maskbit = 8;

  161.             srclen--;

  162.             continue;

  163.         }

  164.         if ((mask & (1 << (--maskbit))) == 0) {

  165.             if (destptr + 4 > destptr_end)

  166.                 break;

  167.             *(int*)destptr = *(int*)srcptr;

  168.             srclen -= 4;

  169.             destptr += 4;

  170.             srcptr += 4;

  171.         } else {

  172.             ofs = *(srcptr++);

  173.             cnt = *(srcptr++);

  174.             ofs += cnt * 256;;

  175.             cnt = ((cnt >> 3) & 0x1f) + 1;

  176.             ofs &= 0x7ff;

  177.             srclen -= 2;

  178.             cnt *= 4;

  179.             if (destptr + cnt > destptr_end) {

  180.                 cnt =  destptr_end - destptr;

  181.             }

  182.             for (; cnt > 0; cnt--) {

  183.                 *(destptr) = *(destptr - ofs);

  184.                 destptr++;

  185.             }

  186.         }

  187.     }

  188. 

  189.     return (destptr - destptr_bak);

  190. }

  191. 

  192. 

  193. 

  194. #ifdef CONFIG_DECODERS

  195. /*

  196.  *

  197.  * Decode a frame

  198.  *

  199.  */

  200. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)

  201. {

  202.         LclContext * const c = avctx->priv_data;

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

  204.     unsigned int pixel_ptr;

  205.     int row, col;

  206.     unsigned char *outptr;

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

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

  209.     unsigned int mszh_dlen;

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

  211.     int uqvq;

  212.     unsigned int mthread_inlen, mthread_outlen;

  213. #ifdef CONFIG_ZLIB

  214.     int zret; // Zlib return code

  215. #endif

  216.     unsigned int len = buf_size;

  217. 

  218.         if(c->pic.data[0])

  219.                 avctx->release_buffer(avctx, &c->pic);

  220. 

  221.         c->pic.reference = 0;

  222.         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;

  223.         if(avctx->get_buffer(avctx, &c->pic) < 0){

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

  225.                 return -1;

  226.         }

  227. 

  228.     outptr = c->pic.data[0]; // Output image pointer

  229. 

  230.     /* Decompress frame */

  231.     switch (avctx->codec_id) {

  232.         case CODEC_ID_MSZH:

  233.             switch (c->compression) {

  234.                 case COMP_MSZH:

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

  236.                         mthread_inlen = *((unsigned int*)encoded);

  237.                         mthread_outlen = *((unsigned int*)(encoded+4));

  238.                         if (mthread_outlen > c->decomp_size) // this should not happen

  239.                             mthread_outlen = c->decomp_size;

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

  241.                         if (mthread_outlen != mszh_dlen) {

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

  243.                                    mthread_outlen, mszh_dlen);

  244.                             return -1;

  245.                         }

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

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

  248.                         if (mthread_outlen != mszh_dlen) {

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

  250.                                    mthread_outlen, mszh_dlen);

  251.                             return -1;

  252.                         }

  253.                         encoded = c->decomp_buf;

  254.                         len = c->decomp_size;

  255.                     } else {

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

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

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

  259.                                    c->decomp_size, mszh_dlen);

  260.                             return -1;

  261.                         }

  262.                         encoded = c->decomp_buf;

  263.                         len = mszh_dlen;

  264.                     }

  265.                     break;

  266.                 case COMP_MSZH_NOCOMP:

  267.                     break;

  268.                 default:

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

  270.                     return -1;

  271.             }

  272.             break;

  273.         case CODEC_ID_ZLIB:

  274. #ifdef CONFIG_ZLIB

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

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

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

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

  279.                (len == width * height * 3))

  280.                 break;

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

  282.             if (zret != Z_OK) {

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

  284.                 return -1;

  285.             }

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

  287.                 mthread_inlen = *((unsigned int*)encoded);

  288.                 mthread_outlen = *((unsigned int*)(encoded+4));

  289.                 if (mthread_outlen > c->decomp_size)

  290.                     mthread_outlen = c->decomp_size;

  291.                 c->zstream.next_in = encoded + 8;

  292.                 c->zstream.avail_in = mthread_inlen;

  293.                 c->zstream.next_out = c->decomp_buf;

  294.                 c->zstream.avail_out = c->decomp_size;

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

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

  297.                     av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);

  298.                     return -1;

  299.                 }

  300.                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {

  301.                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",

  302.                            mthread_outlen, c->zstream.total_out);

  303.                     return -1;

  304.                 }

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

  306.                 if (zret != Z_OK) {

  307.                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);

  308.                     return -1;

  309.                 }

  310.                 c->zstream.next_in = encoded + 8 + mthread_inlen;

  311.                 c->zstream.avail_in = len - mthread_inlen;

  312.                 c->zstream.next_out = c->decomp_buf + mthread_outlen;

  313.                 c->zstream.avail_out = c->decomp_size - mthread_outlen;

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

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

  316.                     av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);

  317.                     return -1;

  318.                 }

  319.                 if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {

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

  321.                            mthread_outlen, c->zstream.total_out);

  322.                     return -1;

  323.                 }

  324.             } else {

  325.                 c->zstream.next_in = encoded;

  326.                 c->zstream.avail_in = len;

  327.                 c->zstream.next_out = c->decomp_buf;

  328.                 c->zstream.avail_out = c->decomp_size;

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

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

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

  332.                     return -1;

  333.                 }

  334.                 if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {

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

  336.                            c->decomp_size, c->zstream.total_out);

  337.                     return -1;

  338.                 }

  339.             }

  340.             encoded = c->decomp_buf;

  341.             len = c->decomp_size;;

  342. #else

  343.             av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");

  344.             return -1;

  345. #endif

  346.             break;

  347.         default:

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

  349.             return -1;

  350.     }

  351. 

  352. 

  353.     /* Apply PNG filter */

  354.     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {

  355.         switch (c->imgtype) {

  356.             case IMGTYPE_YUV111:

  357.             case IMGTYPE_RGB24:

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

  359.                     pixel_ptr = row * width * 3;

  360.                     yq = encoded[pixel_ptr++];

  361.                     uqvq = encoded[pixel_ptr++];

  362.                     uqvq+=(encoded[pixel_ptr++] << 8);

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

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

  365.                         uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));

  366.                         encoded[pixel_ptr+1] = (uqvq) & 0xff;

  367.                         encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;

  368.                         pixel_ptr += 3;

  369.                     }

  370.                 }

  371.                 break;

  372.             case IMGTYPE_YUV422:

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

  374.                     pixel_ptr = row * width * 2;

  375.                     yq = uq = vq =0;

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

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

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

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

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

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

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

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

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

  385.                         pixel_ptr += 8;

  386.                     }

  387.                 }

  388.                 break;

  389.             case IMGTYPE_YUV411:

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

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

  392.                     yq = uq = vq =0;

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

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

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

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

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

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

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

  400.                         pixel_ptr += 6;

  401.                     }

  402.                 }

  403.                 break;

  404.             case IMGTYPE_YUV211:

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

  406.                     pixel_ptr = row * width * 2;

  407.                     yq = uq = vq =0;

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

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

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

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

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

  413.                         pixel_ptr += 4;

  414.                     }

  415.                 }

  416.                 break;

  417.             case IMGTYPE_YUV420:

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

  419.                     pixel_ptr = row * width * 3;

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

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

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

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

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

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

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

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

  428.                         pixel_ptr += 6;

  429.                     }

  430.                 }

  431.                 break;

  432.             default:

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

  434.                 return -1;

  435.         }

  436.     }

  437. 

  438.     /* Convert colorspace */

  439.     switch (c->imgtype) {

  440.         case IMGTYPE_YUV111:

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

  442.                 pixel_ptr = row * c->pic.linesize[0];

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

  444.                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);

  445.                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);

  446.                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);

  447.                     encoded += 3;

  448.                 }

  449.             }

  450.             break;

  451.         case IMGTYPE_YUV422:

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

  453.                 pixel_ptr = row * c->pic.linesize[0];

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

  455.                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);

  456.                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);

  457.                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);

  458.                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);

  459.                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);

  460.                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);

  461.                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);

  462.                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);

  463.                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);

  464.                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);

  465.                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);

  466.                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);

  467.                     encoded += 8;

  468.                 }

  469.             }

  470.             break;

  471.         case IMGTYPE_RGB24:

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

  473.                 pixel_ptr = row * c->pic.linesize[0];

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

  475.                     outptr[pixel_ptr++] = encoded[0];

  476.                     outptr[pixel_ptr++] = encoded[1];

  477.                     outptr[pixel_ptr++] = encoded[2];

  478.                     encoded += 3;

  479.                 }

  480.             }

  481.             break;

  482.         case IMGTYPE_YUV411:

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

  484.                 pixel_ptr = row * c->pic.linesize[0];

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

  486.                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);

  487.                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);

  488.                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);

  489.                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);

  490.                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);

  491.                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);

  492.                     outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);

  493.                     outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);

  494.                     outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);

  495.                     outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);

  496.                     outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);

  497.                     outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);

  498.                     encoded += 6;

  499.                 }

  500.             }

  501.             break;

  502.         case IMGTYPE_YUV211:

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

  504.                 pixel_ptr = row * c->pic.linesize[0];

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

  506.                     outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);

  507.                     outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);

  508.                     outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);

  509.                     outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);

  510.                     outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);

  511.                     outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);

  512.                     encoded += 4;

  513.                 }

  514.             }

  515.             break;

  516.         case IMGTYPE_YUV420:

  517.             for (row = height / 2 - 1; row >= 0; row--) {

  518.                 pixel_ptr = 2 * row * c->pic.linesize[0];

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

  520.                     outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);

  521.                     outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);

  522.                     outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);

  523.                     outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);

  524.                     outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);

  525.                     outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);

  526.                     outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);

  527.                     outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);

  528.                     outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);

  529.                     outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);

  530.                     outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);

  531.                     outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);

  532.                     pixel_ptr += 6;

  533.                     encoded += 6;

  534.                 }

  535.             }

  536.             break;

  537.         default:

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

  539.             return -1;

  540.     }

  541. 

  542.     *data_size = sizeof(AVFrame);

  543.     *(AVFrame*)data = c->pic;

  544. 

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

  546.     return buf_size;

  547. }

  548. #endif

  549. 

  550. #ifdef CONFIG_ENCODERS

  551. /*

  552.  *

  553.  * Encode a frame

  554.  *

  555.  */

  556. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  557.     LclContext *c = avctx->priv_data;

  558.     AVFrame *pict = data;

  559.     AVFrame * const p = &c->pic;

  560.     int i;

  561.     int zret; // Zlib return code

  562. 

  563. #ifndef CONFIG_ZLIB

  564.     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");

  565.     return -1;

  566. #else

  567. 

  568.     init_put_bits(&c->pb, buf, buf_size);

  569. 

  570.     *p = *pict;

  571.     p->pict_type= FF_I_TYPE;

  572.     p->key_frame= 1;

  573. 

  574.     if(avctx->pix_fmt != PIX_FMT_BGR24){

  575.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  576.         return -1;

  577.     }

  578. 

  579.     zret = deflateReset(&(c->zstream));

  580.     if (zret != Z_OK) {

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

  582.         return -1;

  583.     }

  584.     c->zstream.next_out = c->comp_buf;

  585.     c->zstream.avail_out = c->max_comp_size;

  586. 

  587.     for(i = avctx->height - 1; i >= 0; i--) {

  588.         c->zstream.next_in = p->data[0]+p->linesize[0]*i;

  589.         c->zstream.avail_in = avctx->width*3;

  590.         zret = deflate(&(c->zstream), Z_NO_FLUSH);

  591.         if (zret != Z_OK) {

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

  593.             return -1;

  594.         }

  595.     }

  596.     zret = deflate(&(c->zstream), Z_FINISH);

  597.     if (zret != Z_STREAM_END) {

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

  599.         return -1;

  600.     }

  601. 

  602.     for (i = 0; i < c->zstream.total_out; i++)

  603.         put_bits(&c->pb, 8, c->comp_buf[i]);

  604.     flush_put_bits(&c->pb);

  605. 

  606.     return c->zstream.total_out;

  607. #endif

  608. }

  609. #endif /* CONFIG_ENCODERS */

  610. 

  611. #ifdef CONFIG_DECODERS

  612. /*

  613.  *

  614.  * Init lcl decoder

  615.  *

  616.  */

  617. static int decode_init(AVCodecContext *avctx)

  618. {

  619.     LclContext * const c = avctx->priv_data;

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

  621.     unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);

  622.     unsigned int max_decomp_size;

  623.     int zret; // Zlib return code

  624. 

  625.     c->avctx = avctx;

  626. 

  627.     c->pic.data[0] = NULL;

  628. 

  629. #ifdef CONFIG_ZLIB

  630.     // Needed if zlib unused or init aborted before inflateInit

  631.     memset(&(c->zstream), 0, sizeof(z_stream));

  632. #endif

  633. 

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

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

  636.         return 1;

  637.     }

  638. 

  639.     if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {

  640.         return 1;

  641.     }

  642. 

  643.     /* Check codec type */

  644.     if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||

  645.         ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {

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

  647.     }

  648. 

  649.     /* Detect image type */

  650.     switch (c->imgtype = *((char *)avctx->extradata + 4)) {

  651.         case IMGTYPE_YUV111:

  652.             c->decomp_size = basesize * 3;

  653.             max_decomp_size = max_basesize * 3;

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

  655.             break;

  656.         case IMGTYPE_YUV422:

  657.             c->decomp_size = basesize * 2;

  658.             max_decomp_size = max_basesize * 2;

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

  660.             break;

  661.         case IMGTYPE_RGB24:

  662.             c->decomp_size = basesize * 3;

  663.             max_decomp_size = max_basesize * 3;

  664.             av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");

  665.             break;

  666.         case IMGTYPE_YUV411:

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

  668.             max_decomp_size = max_basesize / 2 * 3;

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

  670.             break;

  671.         case IMGTYPE_YUV211:

  672.             c->decomp_size = basesize * 2;

  673.             max_decomp_size = max_basesize * 2;

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

  675.             break;

  676.         case IMGTYPE_YUV420:

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

  678.             max_decomp_size = max_basesize / 2 * 3;

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

  680.             break;

  681.         default:

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

  683.             return 1;

  684.     }

  685. 

  686.     /* Detect compression method */

  687.     c->compression = *((char *)avctx->extradata + 5);

  688.     switch (avctx->codec_id) {

  689.         case CODEC_ID_MSZH:

  690.             switch (c->compression) {

  691.                 case COMP_MSZH:

  692.                     av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");

  693.                     break;

  694.                 case COMP_MSZH_NOCOMP:

  695.                     c->decomp_size = 0;

  696.                     av_log(avctx, AV_LOG_INFO, "No compression.\n");

  697.                     break;

  698.                 default:

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

  700.                     return 1;

  701.             }

  702.             break;

  703.         case CODEC_ID_ZLIB:

  704. #ifdef CONFIG_ZLIB

  705.             switch (c->compression) {

  706.                 case COMP_ZLIB_HISPEED:

  707.                     av_log(avctx, AV_LOG_INFO, "High speed compression.\n");

  708.                     break;

  709.                 case COMP_ZLIB_HICOMP:

  710.                     av_log(avctx, AV_LOG_INFO, "High compression.\n");

  711.                     break;

  712.                 case COMP_ZLIB_NORMAL:

  713.                     av_log(avctx, AV_LOG_INFO, "Normal compression.\n");

  714.                     break;

  715.                 default:

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

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

  718.                         return 1;

  719.                     }

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

  721.             }

  722. #else

  723.             av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");

  724.             return 1;

  725. #endif

  726.             break;

  727.         default:

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

  729.             return 1;

  730.     }

  731. 

  732.     /* Allocate decompression buffer */

  733.     if (c->decomp_size) {

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

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

  736.             return 1;

  737.         }

  738.     }

  739. 

  740.     /* Detect flags */

  741.     c->flags = *((char *)avctx->extradata + 6);

  742.     if (c->flags & FLAG_MULTITHREAD)

  743.         av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");

  744.     if (c->flags & FLAG_NULLFRAME)

  745.         av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");

  746.     if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))

  747.         av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");

  748.     if (c->flags & FLAGMASK_UNUSED)

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

  750. 

  751.     /* If needed init zlib */

  752.     if (avctx->codec_id == CODEC_ID_ZLIB) {

  753. #ifdef CONFIG_ZLIB

  754.         c->zstream.zalloc = Z_NULL;

  755.         c->zstream.zfree = Z_NULL;

  756.         c->zstream.opaque = Z_NULL;

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

  758.         if (zret != Z_OK) {

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

  760.             return 1;

  761.         }

  762. #else

  763.     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");

  764.     return 1;

  765. #endif

  766.     }

  767. 

  768.     avctx->pix_fmt = PIX_FMT_BGR24;

  769. 

  770.     return 0;

  771. }

  772. #endif /* CONFIG_DECODERS */

  773. 

  774. #ifdef CONFIG_ENCODERS

  775. /*

  776.  *

  777.  * Init lcl encoder

  778.  *

  779.  */

  780. static int encode_init(AVCodecContext *avctx)

  781. {

  782.     LclContext *c = avctx->priv_data;

  783.     int zret; // Zlib return code

  784. 

  785. #ifndef CONFIG_ZLIB

  786.     av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");

  787.     return 1;

  788. #else

  789. 

  790.     c->avctx= avctx;

  791. 

  792.     assert(avctx->width && avctx->height);

  793. 

  794.     avctx->extradata= av_mallocz(8);

  795.     avctx->coded_frame= &c->pic;

  796. 

  797.     // Will be user settable someday

  798.     c->compression = 6;

  799.     c->flags = 0;

  800. 

  801.     switch(avctx->pix_fmt){

  802.         case PIX_FMT_BGR24:

  803.             c->imgtype = IMGTYPE_RGB24;

  804.             c->decomp_size = avctx->width * avctx->height * 3;

  805.             avctx->bits_per_sample= 24;

  806.             break;

  807.         default:

  808.             av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);

  809.             return -1;

  810.     }

  811. 

  812.     ((uint8_t*)avctx->extradata)[0]= 4;

  813.     ((uint8_t*)avctx->extradata)[1]= 0;

  814.     ((uint8_t*)avctx->extradata)[2]= 0;

  815.     ((uint8_t*)avctx->extradata)[3]= 0;

  816.     ((uint8_t*)avctx->extradata)[4]= c->imgtype;

  817.     ((uint8_t*)avctx->extradata)[5]= c->compression;

  818.     ((uint8_t*)avctx->extradata)[6]= c->flags;

  819.     ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;

  820.     c->avctx->extradata_size= 8;

  821. 

  822.     c->zstream.zalloc = Z_NULL;

  823.     c->zstream.zfree = Z_NULL;

  824.     c->zstream.opaque = Z_NULL;

  825.     zret = deflateInit(&(c->zstream), c->compression);

  826.     if (zret != Z_OK) {

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

  828.         return 1;

  829.     }

  830. 

  831.         /* Conservative upper bound taken from zlib v1.2.1 source */

  832.         c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +

  833.                            ((c->decomp_size + 63) >> 6) + 11;

  834.     if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {

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

  836.         return 1;

  837.     }

  838. 

  839.     return 0;

  840. #endif

  841. }

  842. #endif /* CONFIG_ENCODERS */

  843. 

  844. 

  845. 

  846. #ifdef CONFIG_DECODERS

  847. /*

  848.  *

  849.  * Uninit lcl decoder

  850.  *

  851.  */

  852. static int decode_end(AVCodecContext *avctx)

  853. {

  854.         LclContext * const c = avctx->priv_data;

  855. 

  856.         if (c->pic.data[0])

  857.                 avctx->release_buffer(avctx, &c->pic);

  858. #ifdef CONFIG_ZLIB

  859.     inflateEnd(&(c->zstream));

  860. #endif

  861. 

  862.         return 0;

  863. }

  864. #endif

  865. 

  866. #ifdef CONFIG_ENCODERS

  867. /*

  868.  *

  869.  * Uninit lcl encoder

  870.  *

  871.  */

  872. static int encode_end(AVCodecContext *avctx)

  873. {

  874.     LclContext *c = avctx->priv_data;

  875. 

  876.     av_freep(&avctx->extradata);

  877.     av_freep(&c->comp_buf);

  878. #ifdef CONFIG_ZLIB

  879.     deflateEnd(&(c->zstream));

  880. #endif

  881. 

  882.     return 0;

  883. }

  884. #endif

  885. 

  886. #ifdef CONFIG_MSZH_DECODER

  887. AVCodec mszh_decoder = {

  888.         "mszh",

  889.         CODEC_TYPE_VIDEO,

  890.         CODEC_ID_MSZH,

  891.         sizeof(LclContext),

  892.         decode_init,

  893.         NULL,

  894.         decode_end,

  895.         decode_frame,

  896.         CODEC_CAP_DR1,

  897. };

  898. #endif

  899. 

  900. #ifdef CONFIG_ZLIB_DECODER

  901. AVCodec zlib_decoder = {

  902.         "zlib",

  903.         CODEC_TYPE_VIDEO,

  904.         CODEC_ID_ZLIB,

  905.         sizeof(LclContext),

  906.         decode_init,

  907.         NULL,

  908.         decode_end,

  909.         decode_frame,

  910.         CODEC_CAP_DR1,

  911. };

  912. #endif

  913. 

  914. #ifdef CONFIG_ENCODERS

  915. 

  916. AVCodec zlib_encoder = {

  917.     "zlib",

  918.     CODEC_TYPE_VIDEO,

  919.     CODEC_ID_ZLIB,

  920.     sizeof(LclContext),

  921.     encode_init,

  922.     encode_frame,

  923.     encode_end,

  924. };

  925. 

  926. #endif //CONFIG_ENCODERS