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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.  * @file lcl.c

  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 "avcodec.h"

  45. #include "bitstream.h"

  46. 

  47. #ifdef CONFIG_ZLIB

  48. #include <zlib.h>

  49. #endif

  50. 

  51. 

  52. #define BMPTYPE_YUV 1

  53. #define BMPTYPE_RGB 2

  54. 

  55. #define IMGTYPE_YUV111 0

  56. #define IMGTYPE_YUV422 1

  57. #define IMGTYPE_RGB24 2

  58. #define IMGTYPE_YUV411 3

  59. #define IMGTYPE_YUV211 4

  60. #define IMGTYPE_YUV420 5

  61. 

  62. #define COMP_MSZH 0

  63. #define COMP_MSZH_NOCOMP 1

  64. #define COMP_ZLIB_HISPEED 1

  65. #define COMP_ZLIB_HICOMP 9

  66. #define COMP_ZLIB_NORMAL -1

  67. 

  68. #define FLAG_MULTITHREAD 1

  69. #define FLAG_NULLFRAME 2

  70. #define FLAG_PNGFILTER 4

  71. #define FLAGMASK_UNUSED 0xf8

  72. 

  73. #define CODEC_MSZH 1

  74. #define CODEC_ZLIB 3

  75. 

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

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

  78. 

  79. /*

  80.  * Decoder context

  81.  */

  82. typedef struct LclContext {

  83. 

  84.         AVCodecContext *avctx;

  85.         AVFrame pic;

  86.     PutBitContext pb;

  87. 

  88.     // Image type

  89.     int imgtype;

  90.     // Compression type

  91.     int compression;

  92.     // Flags

  93.     int flags;

  94.     // Decompressed data size

  95.     unsigned int decomp_size;

  96.     // Decompression buffer

  97.     unsigned char* decomp_buf;

  98.     // Maximum compressed data size

  99.     unsigned int max_comp_size;

  100.     // Compression buffer

  101.     unsigned char* comp_buf;

  102. #ifdef CONFIG_ZLIB

  103.     z_stream zstream;

  104. #endif

  105. } LclContext;

  106. 

  107. 

  108. /*

  109.  *

  110.  * Helper functions

  111.  *

  112.  */

  113. static inline unsigned char fix (int pix14)

  114. {

  115.     int tmp;

  116. 

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

  118.     if (tmp < 0)

  119.         return 0;

  120.     if (tmp > 255)

  121.         return 255;

  122.     return tmp;

  123. }

  124. 

  125. 

  126. 

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

  128. {

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

  130. }

  131. 

  132. 

  133. 

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

  135. {

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

  137. }

  138. 

  139. 

  140. 

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

  142. {

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

  144. }

  145. 

  146. 

  147. 

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

  149. {

  150.     unsigned char *destptr_bak = destptr;

  151.     unsigned char *destptr_end = destptr + destsize;

  152.     unsigned char mask = 0;

  153.     unsigned char maskbit = 0;

  154.     unsigned int ofs, cnt;

  155. 

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

  157.         if (maskbit == 0) {

  158.             mask = *(srcptr++);

  159.             maskbit = 8;

  160.             srclen--;

  161.             continue;

  162.         }

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

  164.             if (destptr + 4 > destptr_end)

  165.                 break;

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

  167.             srclen -= 4;

  168.             destptr += 4;

  169.             srcptr += 4;

  170.         } else {

  171.             ofs = *(srcptr++);

  172.             cnt = *(srcptr++);

  173.             ofs += cnt * 256;;

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

  175.             ofs &= 0x7ff;

  176.             srclen -= 2;

  177.             cnt *= 4;

  178.             if (destptr + cnt > destptr_end) {

  179.                 cnt =  destptr_end - destptr;

  180.             }

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

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

  183.                 destptr++;

  184.             }

  185.         }

  186.     }

  187. 

  188.     return (destptr - destptr_bak);

  189. }

  190. 

  191. 

  192. 

  193. #ifdef CONFIG_DECODERS

  194. /*

  195.  *

  196.  * Decode a frame

  197.  *

  198.  */

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

  200. {

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

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

  203.     unsigned int pixel_ptr;

  204.     int row, col;

  205.     unsigned char *outptr;

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

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

  208.     unsigned int mszh_dlen;

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

  210.     int uqvq;

  211.     unsigned int mthread_inlen, mthread_outlen;

  212. #ifdef CONFIG_ZLIB

  213.     int zret; // Zlib return code

  214. #endif

  215.     unsigned int len = buf_size;

  216. 

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

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

  219. 

  220.         c->pic.reference = 0;

  221.         c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;

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

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

  224.                 return -1;

  225.         }

  226. 

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

  228. 

  229.     /* Decompress frame */

  230.     switch (avctx->codec_id) {

  231.         case CODEC_ID_MSZH:

  232.             switch (c->compression) {

  233.                 case COMP_MSZH:

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

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

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

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

  238.                             mthread_outlen = c->decomp_size;

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

  240.                         if (mthread_outlen != mszh_dlen) {

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

  242.                                    mthread_outlen, mszh_dlen);

  243.                             return -1;

  244.                         }

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

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

  247.                         if (mthread_outlen != mszh_dlen) {

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

  249.                                    mthread_outlen, mszh_dlen);

  250.                             return -1;

  251.                         }

  252.                         encoded = c->decomp_buf;

  253.                         len = c->decomp_size;

  254.                     } else {

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

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

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

  258.                                    c->decomp_size, mszh_dlen);

  259.                             return -1;

  260.                         }

  261.                         encoded = c->decomp_buf;

  262.                         len = mszh_dlen;

  263.                     }

  264.                     break;

  265.                 case COMP_MSZH_NOCOMP:

  266.                     break;

  267.                 default:

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

  269.                     return -1;

  270.             }

  271.             break;

  272.         case CODEC_ID_ZLIB:

  273. #ifdef CONFIG_ZLIB

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

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

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

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

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

  279.                 break;

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

  281.             if (zret != Z_OK) {

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

  283.                 return -1;

  284.             }

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

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

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

  288.                 if (mthread_outlen > c->decomp_size)

  289.                     mthread_outlen = c->decomp_size;

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

  291.                 c->zstream.avail_in = mthread_inlen;

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

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

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

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

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

  297.                     return -1;

  298.                 }

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

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

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

  302.                     return -1;

  303.                 }

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

  305.                 if (zret != Z_OK) {

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

  307.                     return -1;

  308.                 }

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

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

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

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

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

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

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

  316.                     return -1;

  317.                 }

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

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

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

  321.                     return -1;

  322.                 }

  323.             } else {

  324.                 c->zstream.next_in = encoded;

  325.                 c->zstream.avail_in = len;

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

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

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

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

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

  331.                     return -1;

  332.                 }

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

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

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

  336.                     return -1;

  337.                 }

  338.             }

  339.             encoded = c->decomp_buf;

  340.             len = c->decomp_size;;

  341. #else

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

  343.             return -1;

  344. #endif

  345.             break;

  346.         default:

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

  348.             return -1;

  349.     }

  350. 

  351. 

  352.     /* Apply PNG filter */

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

  354.         switch (c->imgtype) {

  355.             case IMGTYPE_YUV111:

  356.             case IMGTYPE_RGB24:

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

  358.                     pixel_ptr = row * width * 3;

  359.                     yq = encoded[pixel_ptr++];

  360.                     uqvq = AV_RL16(encoded+pixel_ptr);

  361.                     pixel_ptr += 2;

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

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

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

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

  366.                         pixel_ptr += 3;

  367.                     }

  368.                 }

  369.                 break;

  370.             case IMGTYPE_YUV422:

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

  372.                     pixel_ptr = row * width * 2;

  373.                     yq = uq = vq =0;

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

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

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

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

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

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

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

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

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

  383.                         pixel_ptr += 8;

  384.                     }

  385.                 }

  386.                 break;

  387.             case IMGTYPE_YUV411:

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

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

  390.                     yq = uq = vq =0;

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

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

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

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

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

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

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

  398.                         pixel_ptr += 6;

  399.                     }

  400.                 }

  401.                 break;

  402.             case IMGTYPE_YUV211:

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

  404.                     pixel_ptr = row * width * 2;

  405.                     yq = uq = vq =0;

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

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

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

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

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

  411.                         pixel_ptr += 4;

  412.                     }

  413.                 }

  414.                 break;

  415.             case IMGTYPE_YUV420:

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

  417.                     pixel_ptr = row * width * 3;

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

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

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

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

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

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

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

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

  426.                         pixel_ptr += 6;

  427.                     }

  428.                 }

  429.                 break;

  430.             default:

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

  432.                 return -1;

  433.         }

  434.     }

  435. 

  436.     /* Convert colorspace */

  437.     switch (c->imgtype) {

  438.         case IMGTYPE_YUV111:

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

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

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

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

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

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

  445.                     encoded += 3;

  446.                 }

  447.             }

  448.             break;

  449.         case IMGTYPE_YUV422:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  465.                     encoded += 8;

  466.                 }

  467.             }

  468.             break;

  469.         case IMGTYPE_RGB24:

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

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

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

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

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

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

  476.                     encoded += 3;

  477.                 }

  478.             }

  479.             break;

  480.         case IMGTYPE_YUV411:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  496.                     encoded += 6;

  497.                 }

  498.             }

  499.             break;

  500.         case IMGTYPE_YUV211:

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

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

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

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

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

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

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

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

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

  510.                     encoded += 4;

  511.                 }

  512.             }

  513.             break;

  514.         case IMGTYPE_YUV420:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  530.                     pixel_ptr += 6;

  531.                     encoded += 6;

  532.                 }

  533.             }

  534.             break;

  535.         default:

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

  537.             return -1;

  538.     }

  539. 

  540.     *data_size = sizeof(AVFrame);

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

  542. 

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

  544.     return buf_size;

  545. }

  546. #endif

  547. 

  548. #ifdef CONFIG_ENCODERS

  549. /*

  550.  *

  551.  * Encode a frame

  552.  *

  553.  */

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

  555.     LclContext *c = avctx->priv_data;

  556.     AVFrame *pict = data;

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

  558.     int i;

  559.     int zret; // Zlib return code

  560. 

  561. #ifndef CONFIG_ZLIB

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

  563.     return -1;

  564. #else

  565. 

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

  567. 

  568.     *p = *pict;

  569.     p->pict_type= FF_I_TYPE;

  570.     p->key_frame= 1;

  571. 

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

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

  574.         return -1;

  575.     }

  576. 

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

  578.     if (zret != Z_OK) {

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

  580.         return -1;

  581.     }

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

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

  584. 

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

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

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

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

  589.         if (zret != Z_OK) {

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

  591.             return -1;

  592.         }

  593.     }

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

  595.     if (zret != Z_STREAM_END) {

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

  597.         return -1;

  598.     }

  599. 

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

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

  602.     flush_put_bits(&c->pb);

  603. 

  604.     return c->zstream.total_out;

  605. #endif

  606. }

  607. #endif /* CONFIG_ENCODERS */

  608. 

  609. #ifdef CONFIG_DECODERS

  610. /*

  611.  *

  612.  * Init lcl decoder

  613.  *

  614.  */

  615. static int decode_init(AVCodecContext *avctx)

  616. {

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

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

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

  620.     unsigned int max_decomp_size;

  621.     int zret; // Zlib return code

  622. 

  623.     c->avctx = avctx;

  624. 

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

  626. 

  627. #ifdef CONFIG_ZLIB

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

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

  630. #endif

  631. 

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

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

  634.         return 1;

  635.     }

  636. 

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

  638.         return 1;

  639.     }

  640. 

  641.     /* Check codec type */

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

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

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

  645.     }

  646. 

  647.     /* Detect image type */

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

  649.         case IMGTYPE_YUV111:

  650.             c->decomp_size = basesize * 3;

  651.             max_decomp_size = max_basesize * 3;

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

  653.             break;

  654.         case IMGTYPE_YUV422:

  655.             c->decomp_size = basesize * 2;

  656.             max_decomp_size = max_basesize * 2;

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

  658.             break;

  659.         case IMGTYPE_RGB24:

  660.             c->decomp_size = basesize * 3;

  661.             max_decomp_size = max_basesize * 3;

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

  663.             break;

  664.         case IMGTYPE_YUV411:

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

  666.             max_decomp_size = max_basesize / 2 * 3;

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

  668.             break;

  669.         case IMGTYPE_YUV211:

  670.             c->decomp_size = basesize * 2;

  671.             max_decomp_size = max_basesize * 2;

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

  673.             break;

  674.         case IMGTYPE_YUV420:

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

  676.             max_decomp_size = max_basesize / 2 * 3;

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

  678.             break;

  679.         default:

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

  681.             return 1;

  682.     }

  683. 

  684.     /* Detect compression method */

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

  686.     switch (avctx->codec_id) {

  687.         case CODEC_ID_MSZH:

  688.             switch (c->compression) {

  689.                 case COMP_MSZH:

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

  691.                     break;

  692.                 case COMP_MSZH_NOCOMP:

  693.                     c->decomp_size = 0;

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

  695.                     break;

  696.                 default:

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

  698.                     return 1;

  699.             }

  700.             break;

  701.         case CODEC_ID_ZLIB:

  702. #ifdef CONFIG_ZLIB

  703.             switch (c->compression) {

  704.                 case COMP_ZLIB_HISPEED:

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

  706.                     break;

  707.                 case COMP_ZLIB_HICOMP:

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

  709.                     break;

  710.                 case COMP_ZLIB_NORMAL:

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

  712.                     break;

  713.                 default:

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

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

  716.                         return 1;

  717.                     }

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

  719.             }

  720. #else

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

  722.             return 1;

  723. #endif

  724.             break;

  725.         default:

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

  727.             return 1;

  728.     }

  729. 

  730.     /* Allocate decompression buffer */

  731.     if (c->decomp_size) {

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

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

  734.             return 1;

  735.         }

  736.     }

  737. 

  738.     /* Detect flags */

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

  740.     if (c->flags & FLAG_MULTITHREAD)

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

  742.     if (c->flags & FLAG_NULLFRAME)

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

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

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

  746.     if (c->flags & FLAGMASK_UNUSED)

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

  748. 

  749.     /* If needed init zlib */

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

  751. #ifdef CONFIG_ZLIB

  752.         c->zstream.zalloc = Z_NULL;

  753.         c->zstream.zfree = Z_NULL;

  754.         c->zstream.opaque = Z_NULL;

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

  756.         if (zret != Z_OK) {

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

  758.             return 1;

  759.         }

  760. #else

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

  762.     return 1;

  763. #endif

  764.     }

  765. 

  766.     avctx->pix_fmt = PIX_FMT_BGR24;

  767. 

  768.     return 0;

  769. }

  770. #endif /* CONFIG_DECODERS */

  771. 

  772. #ifdef CONFIG_ENCODERS

  773. /*

  774.  *

  775.  * Init lcl encoder

  776.  *

  777.  */

  778. static int encode_init(AVCodecContext *avctx)

  779. {

  780.     LclContext *c = avctx->priv_data;

  781.     int zret; // Zlib return code

  782. 

  783. #ifndef CONFIG_ZLIB

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

  785.     return 1;

  786. #else

  787. 

  788.     c->avctx= avctx;

  789. 

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

  791. 

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

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

  794. 

  795.     // Will be user settable someday

  796.     c->compression = 6;

  797.     c->flags = 0;

  798. 

  799.     switch(avctx->pix_fmt){

  800.         case PIX_FMT_BGR24:

  801.             c->imgtype = IMGTYPE_RGB24;

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

  803.             avctx->bits_per_sample= 24;

  804.             break;

  805.         default:

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

  807.             return -1;

  808.     }

  809. 

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

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

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

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

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

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

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

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

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

  819. 

  820.     c->zstream.zalloc = Z_NULL;

  821.     c->zstream.zfree = Z_NULL;

  822.     c->zstream.opaque = Z_NULL;

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

  824.     if (zret != Z_OK) {

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

  826.         return 1;

  827.     }

  828. 

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

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

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

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

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

  834.         return 1;

  835.     }

  836. 

  837.     return 0;

  838. #endif

  839. }

  840. #endif /* CONFIG_ENCODERS */

  841. 

  842. 

  843. 

  844. #ifdef CONFIG_DECODERS

  845. /*

  846.  *

  847.  * Uninit lcl decoder

  848.  *

  849.  */

  850. static int decode_end(AVCodecContext *avctx)

  851. {

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

  853. 

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

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

  856. #ifdef CONFIG_ZLIB

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

  858. #endif

  859. 

  860.         return 0;

  861. }

  862. #endif

  863. 

  864. #ifdef CONFIG_ENCODERS

  865. /*

  866.  *

  867.  * Uninit lcl encoder

  868.  *

  869.  */

  870. static int encode_end(AVCodecContext *avctx)

  871. {

  872.     LclContext *c = avctx->priv_data;

  873. 

  874.     av_freep(&avctx->extradata);

  875.     av_freep(&c->comp_buf);

  876. #ifdef CONFIG_ZLIB

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

  878. #endif

  879. 

  880.     return 0;

  881. }

  882. #endif

  883. 

  884. #ifdef CONFIG_MSZH_DECODER

  885. AVCodec mszh_decoder = {

  886.         "mszh",

  887.         CODEC_TYPE_VIDEO,

  888.         CODEC_ID_MSZH,

  889.         sizeof(LclContext),

  890.         decode_init,

  891.         NULL,

  892.         decode_end,

  893.         decode_frame,

  894.         CODEC_CAP_DR1,

  895. };

  896. #endif

  897. 

  898. #ifdef CONFIG_ZLIB_DECODER

  899. AVCodec zlib_decoder = {

  900.         "zlib",

  901.         CODEC_TYPE_VIDEO,

  902.         CODEC_ID_ZLIB,

  903.         sizeof(LclContext),

  904.         decode_init,

  905.         NULL,

  906.         decode_end,

  907.         decode_frame,

  908.         CODEC_CAP_DR1,

  909. };

  910. #endif

  911. 

  912. #ifdef CONFIG_ENCODERS

  913. 

  914. AVCodec zlib_encoder = {

  915.     "zlib",

  916.     CODEC_TYPE_VIDEO,

  917.     CODEC_ID_ZLIB,

  918.     sizeof(LclContext),

  919.     encode_init,

  920.     encode_frame,

  921.     encode_end,

  922. };

  923. 

  924. #endif //CONFIG_ENCODERS