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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 int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr)

  149. {

  150.     unsigned char *destptr_bak = destptr;

  151.     unsigned char mask = 0;

  152.     unsigned char maskbit = 0;

  153.     unsigned int ofs, cnt;

  154.   

  155.     while (srclen > 0) {

  156.         if (maskbit == 0) {

  157.             mask = *(srcptr++);

  158.             maskbit = 8;

  159.             srclen--;

  160.             continue;

  161.         }

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

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

  164.             srclen -= 4;

  165.             destptr += 4;

  166.             srcptr += 4;

  167.         } else {

  168.             ofs = *(srcptr++);

  169.             cnt = *(srcptr++);

  170.             ofs += cnt * 256;;

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

  172.             ofs &= 0x7ff;

  173.             srclen -= 2;

  174.             cnt *= 4;

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

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

  177.                 destptr++;

  178.             }

  179.         }

  180.     }

  181. 

  182.     return (destptr - destptr_bak);

  183. }

  184. 

  185. 

  186. 

  187. 

  188. /*

  189.  *

  190.  * Decode a frame

  191.  *

  192.  */

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

  194. {

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

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

  197.     int pixel_ptr;

  198.     int row, col;

  199.     unsigned char *outptr;

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

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

  202.     unsigned int mszh_dlen;

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

  204.     int uqvq;

  205.     unsigned int mthread_inlen, mthread_outlen;

  206. #ifdef CONFIG_ZLIB

  207.     int zret; // Zlib return code

  208. #endif

  209.     int len = buf_size;

  210. 

  211. 	/* no supplementary picture */

  212. 	if (buf_size == 0)

  213. 		return 0;

  214. 

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

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

  217. 

  218. 	c->pic.reference = 0;

  219. 	c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;

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

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

  222. 		return -1;

  223. 	}

  224. 

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

  226. 

  227.     /* Decompress frame */

  228.     switch (avctx->codec_id) {

  229.         case CODEC_ID_MSZH:

  230.             switch (c->compression) {

  231.                 case COMP_MSZH:

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

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

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

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

  236.                         if (mthread_outlen != mszh_dlen) {

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

  238.                                    mthread_outlen, mszh_dlen);

  239.                         }

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

  241.                                                 c->decomp_buf + mthread_outlen);

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

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

  244.                                    c->decomp_size - mthread_outlen, mszh_dlen);

  245.                         }

  246.                         encoded = c->decomp_buf;

  247.                         len = c->decomp_size;

  248.                     } else {

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

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

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

  252.                                    c->decomp_size, mszh_dlen);

  253.                         }

  254.                         encoded = c->decomp_buf;

  255.                         len = mszh_dlen;

  256.                     }

  257.                     break;

  258.                 case COMP_MSZH_NOCOMP:

  259.                     break;

  260.                 default:

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

  262.                     return -1;

  263.             }

  264.             break;

  265.         case CODEC_ID_ZLIB:

  266. #ifdef CONFIG_ZLIB

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

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

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

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

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

  272.                 break;

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

  274.             if (zret != Z_OK) {

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

  276.                 return -1;

  277.             }

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

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

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

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

  282.                 c->zstream.avail_in = mthread_inlen;

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

  284.                 c->zstream.avail_out = mthread_outlen;    

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

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

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

  288.                     return -1;

  289.                 }

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

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

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

  293.                 }

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

  295.                 if (zret != Z_OK) {

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

  297.                     return -1;

  298.                 }

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

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

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

  302.                 c->zstream.avail_out = mthread_outlen;    

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

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

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

  306.                     return -1;

  307.                 }

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

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

  310.                            c->decomp_size - mthread_outlen, c->zstream.total_out);

  311.                 }

  312.             } else {

  313.                 c->zstream.next_in = encoded;

  314.                 c->zstream.avail_in = len;

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

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

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

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

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

  320.                     return -1;

  321.                 }

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

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

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

  325.                 }

  326.             }

  327.             encoded = c->decomp_buf;

  328.             len = c->decomp_size;;

  329. #else

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

  331.             return -1;

  332. #endif

  333.             break;

  334.         default:

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

  336.             return -1;

  337.     }

  338. 

  339. 

  340.     /* Apply PNG filter */

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

  342.         switch (c->imgtype) {

  343.             case IMGTYPE_YUV111:

  344.             case IMGTYPE_RGB24:

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

  346.                     pixel_ptr = row * width * 3;

  347.                     yq = encoded[pixel_ptr++];

  348.                     uqvq = encoded[pixel_ptr++];

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

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

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

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

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

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

  355.                         pixel_ptr += 3;

  356.                     }

  357.                 }

  358.                 break;

  359.             case IMGTYPE_YUV422:

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

  361.                     pixel_ptr = row * width * 2;

  362.                     yq = uq = vq =0;

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

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

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

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

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

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

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

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

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

  372.                         pixel_ptr += 8;

  373.                     }

  374.                 }

  375.                 break;

  376.             case IMGTYPE_YUV411:

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

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

  379.                     yq = uq = vq =0;

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

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

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

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

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

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

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

  387.                         pixel_ptr += 6;

  388.                     }

  389.                 }

  390.                 break;

  391.             case IMGTYPE_YUV211:

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

  393.                     pixel_ptr = row * width * 2;

  394.                     yq = uq = vq =0;

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

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

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

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

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

  400.                         pixel_ptr += 4;

  401.                     }

  402.                 }

  403.                 break;

  404.             case IMGTYPE_YUV420:

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

  406.                     pixel_ptr = row * width * 3;

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

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

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

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

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

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

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

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

  415.                         pixel_ptr += 6;

  416.                     }

  417.                 }

  418.                 break;

  419.             default:

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

  421.                 return -1;

  422.         }

  423.     }

  424. 

  425.     /* Convert colorspace */

  426.     switch (c->imgtype) {

  427.         case IMGTYPE_YUV111:

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

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

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

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

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

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

  434.                     encoded += 3;

  435.                 }

  436.             }

  437.             break;

  438.         case IMGTYPE_YUV422:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  454.                     encoded += 8;

  455.                 }

  456.             }

  457.             break;

  458.         case IMGTYPE_RGB24:

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

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

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

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

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

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

  465.                     encoded += 3;

  466.                 }

  467.             }

  468.             break;

  469.         case IMGTYPE_YUV411:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  485.                     encoded += 6;

  486.                 }

  487.             }

  488.             break;

  489.         case IMGTYPE_YUV211:

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

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

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

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

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

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

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

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

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

  499.                     encoded += 4;

  500.                 }

  501.             }

  502.             break;

  503.         case IMGTYPE_YUV420:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  519.                     pixel_ptr += 6;

  520.                     encoded += 6;

  521.                 }

  522.             }

  523.             break;

  524.         default:

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

  526.             return -1;

  527.     }

  528. 

  529.     *data_size = sizeof(AVFrame);

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

  531. 

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

  533.     return buf_size;

  534. }

  535. 

  536. 

  537. 

  538. /*

  539.  *

  540.  * Encode a frame

  541.  *

  542.  */

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

  544.     LclContext *c = avctx->priv_data;

  545.     AVFrame *pict = data;

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

  547.     int i;

  548.     int zret; // Zlib return code

  549. 

  550. #ifndef CONFIG_ZLIB

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

  552.     return -1;

  553. #else

  554. 

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

  556.     

  557.     *p = *pict;

  558.     p->pict_type= FF_I_TYPE;

  559.     p->key_frame= 1;

  560.     

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

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

  563.         return -1;

  564.     }

  565. 

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

  567.     if (zret != Z_OK) {

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

  569.         return -1;

  570.     }

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

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

  573. 

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

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

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

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

  578.         if (zret != Z_OK) {

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

  580.     	    return -1;

  581.         }

  582.     }

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

  584.     if (zret != Z_STREAM_END) {

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

  586.         return -1;

  587.     }

  588. 

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

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

  591.     flush_put_bits(&c->pb);

  592. 

  593.     return c->zstream.total_out;

  594. #endif

  595. }

  596. 

  597. 

  598. 

  599. /*

  600.  *

  601.  * Init lcl decoder

  602.  *

  603.  */

  604. static int decode_init(AVCodecContext *avctx)

  605. {

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

  607.     int basesize = avctx->width * avctx->height;

  608.     int zret; // Zlib return code

  609. 

  610.     c->avctx = avctx;

  611.     avctx->has_b_frames = 0;

  612. 

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

  614. 

  615. #ifdef CONFIG_ZLIB

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

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

  618. #endif

  619. 

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

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

  622.         return 1;

  623.     }

  624. 

  625.     /* Check codec type */ 

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

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

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

  629.     }

  630. 

  631.     /* Detect image type */

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

  633.         case IMGTYPE_YUV111:

  634.             c->decomp_size = basesize * 3;

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

  636.             break;

  637.         case IMGTYPE_YUV422:

  638.             c->decomp_size = basesize * 2;

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

  640.             break;

  641.         case IMGTYPE_RGB24:

  642.             c->decomp_size = basesize * 3;

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

  644.             break;

  645.         case IMGTYPE_YUV411:

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

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

  648.             break;

  649.         case IMGTYPE_YUV211:

  650.             c->decomp_size = basesize * 2;

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

  652.             break;

  653.         case IMGTYPE_YUV420:

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

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

  656.             break;

  657.         default:

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

  659.             return 1;

  660.     }

  661. 

  662.     /* Detect compression method */

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

  664.     switch (avctx->codec_id) {

  665.         case CODEC_ID_MSZH:

  666.             switch (c->compression) {

  667.                 case COMP_MSZH:

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

  669.                     break;

  670.                 case COMP_MSZH_NOCOMP:

  671.                     c->decomp_size = 0;

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

  673.                     break;

  674.                 default:

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

  676.                     return 1;

  677.             }

  678.             break;

  679.         case CODEC_ID_ZLIB:

  680. #ifdef CONFIG_ZLIB

  681.             switch (c->compression) {

  682.                 case COMP_ZLIB_HISPEED:

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

  684.                     break;

  685.                 case COMP_ZLIB_HICOMP:

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

  687.                     break;

  688.                 case COMP_ZLIB_NORMAL:

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

  690.                     break;

  691.                 default:

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

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

  694.                         return 1;

  695.                     }

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

  697.             }

  698. #else

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

  700.             return 1;

  701. #endif

  702.             break;

  703.         default:

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

  705.             return 1;

  706.     }

  707. 

  708.     /* Allocate decompression buffer */

  709.     /* 4*8 max overflow space for mszh decomp algorithm */

  710.     if (c->decomp_size) {

  711.         if ((c->decomp_buf = av_malloc(c->decomp_size+4*8)) == NULL) {

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

  713.             return 1;

  714.         }

  715.     }

  716.   

  717.     /* Detect flags */ 

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

  719.     if (c->flags & FLAG_MULTITHREAD)

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

  721.     if (c->flags & FLAG_NULLFRAME)

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

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

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

  725.     if (c->flags & FLAGMASK_UNUSED)

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

  727. 

  728.     /* If needed init zlib */

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

  730. #ifdef CONFIG_ZLIB

  731.         c->zstream.zalloc = Z_NULL;

  732.         c->zstream.zfree = Z_NULL;

  733.         c->zstream.opaque = Z_NULL;

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

  735.         if (zret != Z_OK) {

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

  737.             return 1;

  738.         }

  739. #else

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

  741.     return 1;

  742. #endif

  743.     }

  744. 

  745.     avctx->pix_fmt = PIX_FMT_BGR24;

  746. 

  747.     return 0;

  748. }

  749. 

  750. 

  751. 

  752. /*

  753.  *

  754.  * Init lcl encoder

  755.  *

  756.  */

  757. static int encode_init(AVCodecContext *avctx)

  758. {

  759.     LclContext *c = avctx->priv_data;

  760.     int zret; // Zlib return code

  761. 

  762. #ifndef CONFIG_ZLIB

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

  764.     return 1;

  765. #else

  766. 

  767.     c->avctx= avctx;

  768.         

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

  770.     

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

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

  773. 

  774.     // Will be user settable someday

  775.     c->compression = 6;

  776.     c->flags = 0;

  777. 

  778.     switch(avctx->pix_fmt){

  779.         case PIX_FMT_BGR24:

  780.             c->imgtype = IMGTYPE_RGB24;

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

  782.             avctx->bits_per_sample= 24;

  783.             break;

  784.         default:

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

  786.             return -1;

  787.     }

  788. 

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

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

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

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

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

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

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

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

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

  798.     

  799.     c->zstream.zalloc = Z_NULL;

  800.     c->zstream.zfree = Z_NULL;

  801.     c->zstream.opaque = Z_NULL;

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

  803.     if (zret != Z_OK) {

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

  805.         return 1;

  806.     }

  807. 

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

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

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

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

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

  813.         return 1;

  814.     }

  815. 

  816.     return 0;

  817. #endif

  818. }

  819. 

  820. 

  821. 

  822. 

  823. 

  824. /*

  825.  *

  826.  * Uninit lcl decoder

  827.  *

  828.  */

  829. static int decode_end(AVCodecContext *avctx)

  830. {

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

  832. 

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

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

  835. #ifdef CONFIG_ZLIB

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

  837. #endif

  838. 

  839. 	return 0;

  840. }

  841. 

  842. 

  843. 

  844. /*

  845.  *

  846.  * Uninit lcl encoder

  847.  *

  848.  */

  849. static int encode_end(AVCodecContext *avctx)

  850. {

  851.     LclContext *c = avctx->priv_data;

  852. 

  853.     av_freep(&avctx->extradata);

  854.     av_freep(&c->comp_buf);

  855. #ifdef CONFIG_ZLIB

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

  857. #endif

  858.     

  859.     return 0;

  860. }

  861. 

  862. AVCodec mszh_decoder = {

  863. 	"mszh",

  864. 	CODEC_TYPE_VIDEO,

  865. 	CODEC_ID_MSZH,

  866. 	sizeof(LclContext),

  867. 	decode_init,

  868. 	NULL,

  869. 	decode_end,

  870. 	decode_frame,

  871. 	CODEC_CAP_DR1,

  872. };

  873. 

  874. 

  875. AVCodec zlib_decoder = {

  876. 	"zlib",

  877. 	CODEC_TYPE_VIDEO,

  878. 	CODEC_ID_ZLIB,

  879. 	sizeof(LclContext),

  880. 	decode_init,

  881. 	NULL,

  882. 	decode_end,

  883. 	decode_frame,

  884. 	CODEC_CAP_DR1,

  885. };

  886. 

  887. #ifdef CONFIG_ENCODERS

  888. 

  889. AVCodec zlib_encoder = {

  890.     "zlib",

  891.     CODEC_TYPE_VIDEO,

  892.     CODEC_ID_ZLIB,

  893.     sizeof(LclContext),

  894.     encode_init,

  895.     encode_frame,

  896.     encode_end,

  897. //    .options = lcl_options,

  898. };

  899. 

  900. #endif //CONFIG_ENCODERS