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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 library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

  17.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  18.  *

  19.  */

  20. 

  21. /**

  22.  * @file lcl.c

  23.  * LCL (LossLess Codec Library) Video Codec

  24.  * Decoder for MSZH and ZLIB codecs

  25.  * Experimental encoder for ZLIB RGB24

  26.  *

  27.  * Fourcc: MSZH, ZLIB

  28.  *

  29.  * Original Win32 dll:

  30.  * Ver2.23 By Kenji Oshima 2000.09.20

  31.  * avimszh.dll, avizlib.dll

  32.  *

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

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

  35.  *

  36.  * Supports: BGR24 (RGB 24bpp)

  37.  *

  38.  */

  39. 

  40. #include <stdio.h>

  41. #include <stdlib.h>

  42. 

  43. #include "common.h"

  44. #include "bitstream.h"

  45. #include "avcodec.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. 

  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 = (LclContext *)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 = encoded[pixel_ptr++];

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

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

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

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

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

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

  367.                         pixel_ptr += 3;

  368.                     }

  369.                 }

  370.                 break;

  371.             case IMGTYPE_YUV422:

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

  373.                     pixel_ptr = row * width * 2;

  374.                     yq = uq = vq =0;

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

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

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

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

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

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

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

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

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

  384.                         pixel_ptr += 8;

  385.                     }

  386.                 }

  387.                 break;

  388.             case IMGTYPE_YUV411:

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

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

  391.                     yq = uq = vq =0;

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

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

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

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

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

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

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

  399.                         pixel_ptr += 6;

  400.                     }

  401.                 }

  402.                 break;

  403.             case IMGTYPE_YUV211:

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

  405.                     pixel_ptr = row * width * 2;

  406.                     yq = uq = vq =0;

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

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

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

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

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

  412.                         pixel_ptr += 4;

  413.                     }

  414.                 }

  415.                 break;

  416.             case IMGTYPE_YUV420:

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

  418.                     pixel_ptr = row * width * 3;

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

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

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

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

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

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

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

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

  427.                         pixel_ptr += 6;

  428.                     }

  429.                 }

  430.                 break;

  431.             default:

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

  433.                 return -1;

  434.         }

  435.     }

  436. 

  437.     /* Convert colorspace */

  438.     switch (c->imgtype) {

  439.         case IMGTYPE_YUV111:

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

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

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

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

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

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

  446.                     encoded += 3;

  447.                 }

  448.             }

  449.             break;

  450.         case IMGTYPE_YUV422:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  466.                     encoded += 8;

  467.                 }

  468.             }

  469.             break;

  470.         case IMGTYPE_RGB24:

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

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

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

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

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

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

  477.                     encoded += 3;

  478.                 }

  479.             }

  480.             break;

  481.         case IMGTYPE_YUV411:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  497.                     encoded += 6;

  498.                 }

  499.             }

  500.             break;

  501.         case IMGTYPE_YUV211:

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

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

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

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

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

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

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

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

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

  511.                     encoded += 4;

  512.                 }

  513.             }

  514.             break;

  515.         case IMGTYPE_YUV420:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  531.                     pixel_ptr += 6;

  532.                     encoded += 6;

  533.                 }

  534.             }

  535.             break;

  536.         default:

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

  538.             return -1;

  539.     }

  540. 

  541.     *data_size = sizeof(AVFrame);

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

  543. 

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

  545.     return buf_size;

  546. }

  547. 

  548. 

  549. 

  550. /*

  551.  *

  552.  * Encode a frame

  553.  *

  554.  */

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

  556.     LclContext *c = avctx->priv_data;

  557.     AVFrame *pict = data;

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

  559.     int i;

  560.     int zret; // Zlib return code

  561. 

  562. #ifndef CONFIG_ZLIB

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

  564.     return -1;

  565. #else

  566. 

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

  568.     

  569.     *p = *pict;

  570.     p->pict_type= FF_I_TYPE;

  571.     p->key_frame= 1;

  572.     

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

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

  575.         return -1;

  576.     }

  577. 

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

  579.     if (zret != Z_OK) {

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

  581.         return -1;

  582.     }

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

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

  585. 

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

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

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

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

  590.         if (zret != Z_OK) {

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

  592.     	    return -1;

  593.         }

  594.     }

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

  596.     if (zret != Z_STREAM_END) {

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

  598.         return -1;

  599.     }

  600. 

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

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

  603.     flush_put_bits(&c->pb);

  604. 

  605.     return c->zstream.total_out;

  606. #endif

  607. }

  608. 

  609. 

  610. 

  611. /*

  612.  *

  613.  * Init lcl decoder

  614.  *

  615.  */

  616. static int decode_init(AVCodecContext *avctx)

  617. {

  618.     LclContext * const c = (LclContext *)avctx->priv_data;

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

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

  621.     unsigned int max_decomp_size;

  622.     int zret; // Zlib return code

  623. 

  624.     c->avctx = avctx;

  625.     avctx->has_b_frames = 0;

  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. 

  773. 

  774. 

  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. 

  843. 

  844. 

  845. 

  846. 

  847. /*

  848.  *

  849.  * Uninit lcl decoder

  850.  *

  851.  */

  852. static int decode_end(AVCodecContext *avctx)

  853. {

  854. 	LclContext * const c = (LclContext *)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. 

  865. 

  866. 

  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. 

  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. 

  897. 

  898. AVCodec zlib_decoder = {

  899. 	"zlib",

  900. 	CODEC_TYPE_VIDEO,

  901. 	CODEC_ID_ZLIB,

  902. 	sizeof(LclContext),

  903. 	decode_init,

  904. 	NULL,

  905. 	decode_end,

  906. 	decode_frame,

  907. 	CODEC_CAP_DR1,

  908. };

  909. 

  910. #ifdef CONFIG_ENCODERS

  911. 

  912. AVCodec zlib_encoder = {

  913.     "zlib",

  914.     CODEC_TYPE_VIDEO,

  915.     CODEC_ID_ZLIB,

  916.     sizeof(LclContext),

  917.     encode_init,

  918.     encode_frame,

  919.     encode_end,

  920. };

  921. 

  922. #endif //CONFIG_ENCODERS