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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. 	/* no supplementary picture */

  218. 	if (buf_size == 0)

  219. 		return 0;

  220. 

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

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

  223. 

  224. 	c->pic.reference = 0;

  225. 	c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;

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

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

  228. 		return -1;

  229. 	}

  230. 

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

  232. 

  233.     /* Decompress frame */

  234.     switch (avctx->codec_id) {

  235.         case CODEC_ID_MSZH:

  236.             switch (c->compression) {

  237.                 case COMP_MSZH:

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

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

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

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

  242.                             mthread_outlen = c->decomp_size;

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

  244.                         if (mthread_outlen != mszh_dlen) {

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

  246.                                    mthread_outlen, mszh_dlen);

  247.                             return -1;

  248.                         }

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

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

  251.                         if (mthread_outlen != mszh_dlen) {

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

  253.                                    mthread_outlen, mszh_dlen);

  254.                             return -1;

  255.                         }

  256.                         encoded = c->decomp_buf;

  257.                         len = c->decomp_size;

  258.                     } else {

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

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

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

  262.                                    c->decomp_size, mszh_dlen);

  263.                             return -1;

  264.                         }

  265.                         encoded = c->decomp_buf;

  266.                         len = mszh_dlen;

  267.                     }

  268.                     break;

  269.                 case COMP_MSZH_NOCOMP:

  270.                     break;

  271.                 default:

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

  273.                     return -1;

  274.             }

  275.             break;

  276.         case CODEC_ID_ZLIB:

  277. #ifdef CONFIG_ZLIB

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

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

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

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

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

  283.                 break;

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

  285.             if (zret != Z_OK) {

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

  287.                 return -1;

  288.             }

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

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

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

  292.                 if (mthread_outlen > c->decomp_size)

  293.                     mthread_outlen = c->decomp_size;

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

  295.                 c->zstream.avail_in = mthread_inlen;

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

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

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

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

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

  301.                     return -1;

  302.                 }

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

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

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

  306.                     return -1;

  307.                 }

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

  309.                 if (zret != Z_OK) {

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

  311.                     return -1;

  312.                 }

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

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

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

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

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

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

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

  320.                     return -1;

  321.                 }

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

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

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

  325.                     return -1;

  326.                 }

  327.             } else {

  328.                 c->zstream.next_in = encoded;

  329.                 c->zstream.avail_in = len;

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

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

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

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

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

  335.                     return -1;

  336.                 }

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

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

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

  340.                     return -1;

  341.                 }

  342.             }

  343.             encoded = c->decomp_buf;

  344.             len = c->decomp_size;;

  345. #else

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

  347.             return -1;

  348. #endif

  349.             break;

  350.         default:

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

  352.             return -1;

  353.     }

  354. 

  355. 

  356.     /* Apply PNG filter */

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

  358.         switch (c->imgtype) {

  359.             case IMGTYPE_YUV111:

  360.             case IMGTYPE_RGB24:

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

  362.                     pixel_ptr = row * width * 3;

  363.                     yq = encoded[pixel_ptr++];

  364.                     uqvq = encoded[pixel_ptr++];

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

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

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

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

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

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

  371.                         pixel_ptr += 3;

  372.                     }

  373.                 }

  374.                 break;

  375.             case IMGTYPE_YUV422:

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

  377.                     pixel_ptr = row * width * 2;

  378.                     yq = uq = vq =0;

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

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

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

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

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

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

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

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

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

  388.                         pixel_ptr += 8;

  389.                     }

  390.                 }

  391.                 break;

  392.             case IMGTYPE_YUV411:

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

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

  395.                     yq = uq = vq =0;

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

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

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

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

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

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

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

  403.                         pixel_ptr += 6;

  404.                     }

  405.                 }

  406.                 break;

  407.             case IMGTYPE_YUV211:

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

  409.                     pixel_ptr = row * width * 2;

  410.                     yq = uq = vq =0;

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

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

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

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

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

  416.                         pixel_ptr += 4;

  417.                     }

  418.                 }

  419.                 break;

  420.             case IMGTYPE_YUV420:

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

  422.                     pixel_ptr = row * width * 3;

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

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

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

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

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

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

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

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

  431.                         pixel_ptr += 6;

  432.                     }

  433.                 }

  434.                 break;

  435.             default:

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

  437.                 return -1;

  438.         }

  439.     }

  440. 

  441.     /* Convert colorspace */

  442.     switch (c->imgtype) {

  443.         case IMGTYPE_YUV111:

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

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

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

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

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

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

  450.                     encoded += 3;

  451.                 }

  452.             }

  453.             break;

  454.         case IMGTYPE_YUV422:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  470.                     encoded += 8;

  471.                 }

  472.             }

  473.             break;

  474.         case IMGTYPE_RGB24:

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

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

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

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

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

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

  481.                     encoded += 3;

  482.                 }

  483.             }

  484.             break;

  485.         case IMGTYPE_YUV411:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  501.                     encoded += 6;

  502.                 }

  503.             }

  504.             break;

  505.         case IMGTYPE_YUV211:

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

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

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

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

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

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

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

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

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

  515.                     encoded += 4;

  516.                 }

  517.             }

  518.             break;

  519.         case IMGTYPE_YUV420:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  535.                     pixel_ptr += 6;

  536.                     encoded += 6;

  537.                 }

  538.             }

  539.             break;

  540.         default:

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

  542.             return -1;

  543.     }

  544. 

  545.     *data_size = sizeof(AVFrame);

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

  547. 

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

  549.     return buf_size;

  550. }

  551. 

  552. 

  553. 

  554. /*

  555.  *

  556.  * Encode a frame

  557.  *

  558.  */

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

  560.     LclContext *c = avctx->priv_data;

  561.     AVFrame *pict = data;

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

  563.     int i;

  564.     int zret; // Zlib return code

  565. 

  566. #ifndef CONFIG_ZLIB

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

  568.     return -1;

  569. #else

  570. 

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

  572.     

  573.     *p = *pict;

  574.     p->pict_type= FF_I_TYPE;

  575.     p->key_frame= 1;

  576.     

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

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

  579.         return -1;

  580.     }

  581. 

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

  583.     if (zret != Z_OK) {

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

  585.         return -1;

  586.     }

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

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

  589. 

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

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

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

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

  594.         if (zret != Z_OK) {

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

  596.     	    return -1;

  597.         }

  598.     }

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

  600.     if (zret != Z_STREAM_END) {

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

  602.         return -1;

  603.     }

  604. 

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

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

  607.     flush_put_bits(&c->pb);

  608. 

  609.     return c->zstream.total_out;

  610. #endif

  611. }

  612. 

  613. 

  614. 

  615. /*

  616.  *

  617.  * Init lcl decoder

  618.  *

  619.  */

  620. static int decode_init(AVCodecContext *avctx)

  621. {

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

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

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

  625.     unsigned int max_decomp_size;

  626.     int zret; // Zlib return code

  627. 

  628.     c->avctx = avctx;

  629.     avctx->has_b_frames = 0;

  630. 

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

  632. 

  633. #ifdef CONFIG_ZLIB

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

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

  636. #endif

  637. 

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

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

  640.         return 1;

  641.     }

  642. 

  643.     // FIXME: find a better way to prevent integer overflow

  644.     if (((unsigned int)avctx->width > 32000) || ((unsigned int)avctx->height > 32000)) {

  645.         av_log(avctx, AV_LOG_ERROR, "Bad image size (w = %d, h = %d).\n", avctx->width, avctx->height);

  646.         return 1;

  647.     }

  648. 

  649.     /* Check codec type */ 

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

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

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

  653.     }

  654. 

  655.     /* Detect image type */

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

  657.         case IMGTYPE_YUV111:

  658.             c->decomp_size = basesize * 3;

  659.             max_decomp_size = max_basesize * 3;

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

  661.             break;

  662.         case IMGTYPE_YUV422:

  663.             c->decomp_size = basesize * 2;

  664.             max_decomp_size = max_basesize * 2;

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

  666.             break;

  667.         case IMGTYPE_RGB24:

  668.             c->decomp_size = basesize * 3;

  669.             max_decomp_size = max_basesize * 3;

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

  671.             break;

  672.         case IMGTYPE_YUV411:

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

  674.             max_decomp_size = max_basesize / 2 * 3;

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

  676.             break;

  677.         case IMGTYPE_YUV211:

  678.             c->decomp_size = basesize * 2;

  679.             max_decomp_size = max_basesize * 2;

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

  681.             break;

  682.         case IMGTYPE_YUV420:

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

  684.             max_decomp_size = max_basesize / 2 * 3;

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

  686.             break;

  687.         default:

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

  689.             return 1;

  690.     }

  691. 

  692.     /* Detect compression method */

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

  694.     switch (avctx->codec_id) {

  695.         case CODEC_ID_MSZH:

  696.             switch (c->compression) {

  697.                 case COMP_MSZH:

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

  699.                     break;

  700.                 case COMP_MSZH_NOCOMP:

  701.                     c->decomp_size = 0;

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

  703.                     break;

  704.                 default:

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

  706.                     return 1;

  707.             }

  708.             break;

  709.         case CODEC_ID_ZLIB:

  710. #ifdef CONFIG_ZLIB

  711.             switch (c->compression) {

  712.                 case COMP_ZLIB_HISPEED:

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

  714.                     break;

  715.                 case COMP_ZLIB_HICOMP:

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

  717.                     break;

  718.                 case COMP_ZLIB_NORMAL:

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

  720.                     break;

  721.                 default:

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

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

  724.                         return 1;

  725.                     }

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

  727.             }

  728. #else

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

  730.             return 1;

  731. #endif

  732.             break;

  733.         default:

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

  735.             return 1;

  736.     }

  737. 

  738.     /* Allocate decompression buffer */

  739.     if (c->decomp_size) {

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

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

  742.             return 1;

  743.         }

  744.     }

  745.   

  746.     /* Detect flags */ 

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

  748.     if (c->flags & FLAG_MULTITHREAD)

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

  750.     if (c->flags & FLAG_NULLFRAME)

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

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

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

  754.     if (c->flags & FLAGMASK_UNUSED)

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

  756. 

  757.     /* If needed init zlib */

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

  759. #ifdef CONFIG_ZLIB

  760.         c->zstream.zalloc = Z_NULL;

  761.         c->zstream.zfree = Z_NULL;

  762.         c->zstream.opaque = Z_NULL;

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

  764.         if (zret != Z_OK) {

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

  766.             return 1;

  767.         }

  768. #else

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

  770.     return 1;

  771. #endif

  772.     }

  773. 

  774.     avctx->pix_fmt = PIX_FMT_BGR24;

  775. 

  776.     return 0;

  777. }

  778. 

  779. 

  780. 

  781. /*

  782.  *

  783.  * Init lcl encoder

  784.  *

  785.  */

  786. static int encode_init(AVCodecContext *avctx)

  787. {

  788.     LclContext *c = avctx->priv_data;

  789.     int zret; // Zlib return code

  790. 

  791. #ifndef CONFIG_ZLIB

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

  793.     return 1;

  794. #else

  795. 

  796.     c->avctx= avctx;

  797.         

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

  799.     

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

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

  802. 

  803.     // Will be user settable someday

  804.     c->compression = 6;

  805.     c->flags = 0;

  806. 

  807.     switch(avctx->pix_fmt){

  808.         case PIX_FMT_BGR24:

  809.             c->imgtype = IMGTYPE_RGB24;

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

  811.             avctx->bits_per_sample= 24;

  812.             break;

  813.         default:

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

  815.             return -1;

  816.     }

  817. 

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

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

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

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

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

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

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

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

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

  827.     

  828.     c->zstream.zalloc = Z_NULL;

  829.     c->zstream.zfree = Z_NULL;

  830.     c->zstream.opaque = Z_NULL;

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

  832.     if (zret != Z_OK) {

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

  834.         return 1;

  835.     }

  836. 

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

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

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

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

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

  842.         return 1;

  843.     }

  844. 

  845.     return 0;

  846. #endif

  847. }

  848. 

  849. 

  850. 

  851. 

  852. 

  853. /*

  854.  *

  855.  * Uninit lcl decoder

  856.  *

  857.  */

  858. static int decode_end(AVCodecContext *avctx)

  859. {

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

  861. 

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

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

  864. #ifdef CONFIG_ZLIB

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

  866. #endif

  867. 

  868. 	return 0;

  869. }

  870. 

  871. 

  872. 

  873. /*

  874.  *

  875.  * Uninit lcl encoder

  876.  *

  877.  */

  878. static int encode_end(AVCodecContext *avctx)

  879. {

  880.     LclContext *c = avctx->priv_data;

  881. 

  882.     av_freep(&avctx->extradata);

  883.     av_freep(&c->comp_buf);

  884. #ifdef CONFIG_ZLIB

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

  886. #endif

  887.     

  888.     return 0;

  889. }

  890. 

  891. AVCodec mszh_decoder = {

  892. 	"mszh",

  893. 	CODEC_TYPE_VIDEO,

  894. 	CODEC_ID_MSZH,

  895. 	sizeof(LclContext),

  896. 	decode_init,

  897. 	NULL,

  898. 	decode_end,

  899. 	decode_frame,

  900. 	CODEC_CAP_DR1,

  901. };

  902. 

  903. 

  904. AVCodec zlib_decoder = {

  905. 	"zlib",

  906. 	CODEC_TYPE_VIDEO,

  907. 	CODEC_ID_ZLIB,

  908. 	sizeof(LclContext),

  909. 	decode_init,

  910. 	NULL,

  911. 	decode_end,

  912. 	decode_frame,

  913. 	CODEC_CAP_DR1,

  914. };

  915. 

  916. #ifdef CONFIG_ENCODERS

  917. 

  918. AVCodec zlib_encoder = {

  919.     "zlib",

  920.     CODEC_TYPE_VIDEO,

  921.     CODEC_ID_ZLIB,

  922.     sizeof(LclContext),

  923.     encode_init,

  924.     encode_frame,

  925.     encode_end,

  926. //    .options = lcl_options,

  927. };

  928. 

  929. #endif //CONFIG_ENCODERS