text: /*
   * video_out_pgm.c
   * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
   * Copyright (C) 2003      Regis Duchesne <hpreg@zoy.org>
   * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   * MD5 code derived from linux kernel GPL implementation
   *
   * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
   * See http://libmpeg2.sourceforge.net/ for updates.
   *
   * mpeg2dec is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * mpeg2dec is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include "config.h"
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <inttypes.h>
  
  #include "video_out.h"
  
  typedef struct pgm_instance_s {
      vo_instance_t vo;
      int framenum;
      int width;
      int height;
      int chroma_width;
      int chroma_height;
      char header[1024];
      void (* writer) (struct pgm_instance_s *, uint8_t *, size_t);
      FILE * file;
      uint32_t md5_hash[4];
      uint32_t md5_block[16];
      uint32_t md5_bytes;
  } pgm_instance_t;
  
  static void file_writer (pgm_instance_t * instance, uint8_t * ptr, size_t size)
  {
      fwrite (ptr, size, 1, instance->file);
  }
  
  static void internal_draw_frame (pgm_instance_t * instance,
  				 uint8_t * const * buf)
  {
      static uint8_t black[16384] = { 0 };
      int i;
  
      instance->writer (instance, (uint8_t *)instance->header,
  		      strlen (instance->header));
      for (i = 0; i < instance->height; i++) {
  	instance->writer (instance, buf[0] + i * instance->width,
  			  instance->width);
  	instance->writer (instance, black,
  			  2 * instance->chroma_width - instance->width);
      }
      for (i = 0; i < instance->chroma_height; i++) {
  	instance->writer (instance, buf[1] + i * instance->chroma_width,
  			  instance->chroma_width);
  	instance->writer (instance, buf[2] + i * instance->chroma_width,
  			  instance->chroma_width);
      }
  }
  
  static void pgm_draw_frame (vo_instance_t * _instance,
  			    uint8_t * const * buf, void * id)
  {
      pgm_instance_t * instance = (pgm_instance_t *) _instance;
      char filename[128];
  
      sprintf (filename, "%d.pgm", instance->framenum++);
      instance->file = fopen (filename, "wb");
      if (instance->file == NULL)
  	return;
      internal_draw_frame (instance, buf);
      fclose (instance->file);
  }
  
  static int pgm_setup (vo_instance_t * _instance, unsigned int width,
  		      unsigned int height, unsigned int chroma_width,
  		      unsigned int chroma_height, vo_setup_result_t * result)
  {
      pgm_instance_t * instance;
  
      instance = (pgm_instance_t *) _instance;
  
      /*
       * Layout of the Y, U, and V buffers in our pgm image
       *
       *      YY        YY        YY
       * 420: YY   422: YY   444: YY
       *      UV        UV        UUVV
       *                UV        UUVV
       */
      if (width > 2 * chroma_width)
  	return 1;
  
      instance->width = width;
      instance->height = height;
      instance->chroma_width = chroma_width;
      instance->chroma_height = chroma_height;
      sprintf (instance->header, "P5\n%d %d\n255\n", 2 * chroma_width,
  	     height + chroma_height);
      result->convert = NULL;
      return 0;
  }
  
  static vo_instance_t * internal_open (void draw (vo_instance_t *,
  						 uint8_t * const *, void *),
  				      void writer (pgm_instance_t *,
  						   uint8_t *, size_t))
  {
      pgm_instance_t * instance;
  
      instance = (pgm_instance_t *) malloc (sizeof (pgm_instance_t));
      if (instance == NULL)
          return NULL;
  
      instance->vo.setup = pgm_setup;
      instance->vo.setup_fbuf = NULL;
      instance->vo.set_fbuf = NULL;
      instance->vo.start_fbuf = NULL;
      instance->vo.draw = draw;
      instance->vo.discard = NULL;
      instance->vo.close = (void (*) (vo_instance_t *)) free;
      instance->framenum = 0;
      instance->writer = writer;
      instance->file = stdout;
  
      return (vo_instance_t *) instance;
  }
  
  vo_instance_t * vo_pgm_open (void)
  {
      return internal_open (pgm_draw_frame, file_writer);
  }
  
  static void pgmpipe_draw_frame (vo_instance_t * _instance,
  				uint8_t * const * buf, void * id)
  {
      pgm_instance_t * instance = (pgm_instance_t *) _instance;
      internal_draw_frame (instance, buf);
  }
  
  vo_instance_t * vo_pgmpipe_open (void)
  {
      return internal_open (pgmpipe_draw_frame, file_writer);
  }
  
  #define F1(x,y,z)	(z ^ (x & (y ^ z)))
  #define F2(x,y,z)	F1 (z, x, y)
  #define F3(x,y,z)	(x ^ y ^ z)
  #define F4(x,y,z)	(y ^ (x | ~z))
  
  #define MD5STEP(f,w,x,y,z,in,s) do {					\
      w += f (x, y, z) + in; w = ((w << s) | (w >> (32 - s))) + x;	\
  } while (0)
  
  static void md5_transform (uint32_t * hash, uint32_t const * in)
  {
      uint32_t a, b, c, d;
  
      a = hash[0];
      b = hash[1];
      c = hash[2];
      d = hash[3];
  
      MD5STEP (F1, a, b, c, d, in[0] + 0xd76aa478, 7);
      MD5STEP (F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
      MD5STEP (F1, c, d, a, b, in[2] + 0x242070db, 17);
      MD5STEP (F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
      MD5STEP (F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
      MD5STEP (F1, d, a, b, c, in[5] + 0x4787c62a, 12);
      MD5STEP (F1, c, d, a, b, in[6] + 0xa8304613, 17);
      MD5STEP (F1, b, c, d, a, in[7] + 0xfd469501, 22);
      MD5STEP (F1, a, b, c, d, in[8] + 0x698098d8, 7);
      MD5STEP (F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
      MD5STEP (F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
      MD5STEP (F1, b, c, d, a, in[11] + 0x895cd7be, 22);
      MD5STEP (F1, a, b, c, d, in[12] + 0x6b901122, 7);
      MD5STEP (F1, d, a, b, c, in[13] + 0xfd987193, 12);
      MD5STEP (F1, c, d, a, b, in[14] + 0xa679438e, 17);
      MD5STEP (F1, b, c, d, a, in[15] + 0x49b40821, 22);
  
      MD5STEP (F2, a, b, c, d, in[1] + 0xf61e2562, 5);
      MD5STEP (F2, d, a, b, c, in[6] + 0xc040b340, 9);
      MD5STEP (F2, c, d, a, b, in[11] + 0x265e5a51, 14);
      MD5STEP (F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
      MD5STEP (F2, a, b, c, d, in[5] + 0xd62f105d, 5);
      MD5STEP (F2, d, a, b, c, in[10] + 0x02441453, 9);
      MD5STEP (F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
      MD5STEP (F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
      MD5STEP (F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
      MD5STEP (F2, d, a, b, c, in[14] + 0xc33707d6, 9);
      MD5STEP (F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
      MD5STEP (F2, b, c, d, a, in[8] + 0x455a14ed, 20);
      MD5STEP (F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
      MD5STEP (F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
      MD5STEP (F2, c, d, a, b, in[7] + 0x676f02d9, 14);
      MD5STEP (F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
  
      MD5STEP (F3, a, b, c, d, in[5] + 0xfffa3942, 4);
      MD5STEP (F3, d, a, b, c, in[8] + 0x8771f681, 11);
      MD5STEP (F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
      MD5STEP (F3, b, c, d, a, in[14] + 0xfde5380c, 23);
      MD5STEP (F3, a, b, c, d, in[1] + 0xa4beea44, 4);
      MD5STEP (F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
      MD5STEP (F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
      MD5STEP (F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
      MD5STEP (F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
      MD5STEP (F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
      MD5STEP (F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
      MD5STEP (F3, b, c, d, a, in[6] + 0x04881d05, 23);
      MD5STEP (F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
      MD5STEP (F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
      MD5STEP (F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
      MD5STEP (F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
  
      MD5STEP (F4, a, b, c, d, in[0] + 0xf4292244, 6);
      MD5STEP (F4, d, a, b, c, in[7] + 0x432aff97, 10);
      MD5STEP (F4, c, d, a, b, in[14] + 0xab9423a7, 15);
      MD5STEP (F4, b, c, d, a, in[5] + 0xfc93a039, 21);
      MD5STEP (F4, a, b, c, d, in[12] + 0x655b59c3, 6);
      MD5STEP (F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
      MD5STEP (F4, c, d, a, b, in[10] + 0xffeff47d, 15);
      MD5STEP (F4, b, c, d, a, in[1] + 0x85845dd1, 21);
      MD5STEP (F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
      MD5STEP (F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
      MD5STEP (F4, c, d, a, b, in[6] + 0xa3014314, 15);
      MD5STEP (F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
      MD5STEP (F4, a, b, c, d, in[4] + 0xf7537e82, 6);
      MD5STEP (F4, d, a, b, c, in[11] + 0xbd3af235, 10);
      MD5STEP (F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
      MD5STEP (F4, b, c, d, a, in[9] + 0xeb86d391, 21);
  
      hash[0] += a;
      hash[1] += b;
      hash[2] += c;
      hash[3] += d;
  }
  
  static inline uint32_t swap (uint32_t x) 
  {
      return (((x & 0xff) << 24) | ((x & 0xff00) << 8) |
  	    ((x & 0xff0000) >> 8) | ((x & 0xff000000) >> 24));
  }
  
  static inline void little_endian (uint32_t * buf, unsigned int words)
  {
  #ifdef WORDS_BIGENDIAN
      while (words--)
  	buf[words] = swap (buf[words]);
  #endif
  }
  
  static void md5_writer (pgm_instance_t * instance, uint8_t * ptr, size_t size)
  {
      const unsigned int offset = instance->md5_bytes & 0x3f;
  
      instance->md5_bytes += size;
  
      if (offset + size < 64) {
  	memcpy ((char *)instance->md5_block + offset, ptr, size);
  	return;
      } else if (offset) {
  	const int avail = 64 - offset;
  	memcpy ((char *)instance->md5_block + offset, ptr, avail);
  	little_endian (instance->md5_block, 16);
  	md5_transform (instance->md5_hash, instance->md5_block);
  	ptr += avail;
  	size -= avail;
      }
  
      while (size >= 64) {
  #ifndef ARCH_X86
  	memcpy (instance->md5_block, ptr, 64);
  	little_endian (instance->md5_block, 16);
  	md5_transform (instance->md5_hash, instance->md5_block);
  #else
  	md5_transform (instance->md5_hash, (uint32_t *)ptr);
  #endif
  	ptr += 64;
  	size -= 64;
      }
  
      memcpy (instance->md5_block, ptr, size);
  }
  
  static void md5_draw_frame (vo_instance_t * _instance,
  			    uint8_t * const * buf, void * id)
  {
      pgm_instance_t * instance = (pgm_instance_t *) _instance;
      unsigned int offset;
      char * p;
      int padding;
  
      instance->md5_hash[0] = 0x67452301;
      instance->md5_hash[1] = 0xefcdab89;
      instance->md5_hash[2] = 0x98badcfe;
      instance->md5_hash[3] = 0x10325476;
      instance->md5_bytes = 0;
  
      internal_draw_frame (instance, buf);
  
      offset = instance->md5_bytes & 0x3f;
      p = (char *)instance->md5_block + offset;
      padding = 55 - offset;
  
      *p++ = 0x80;
      if (padding < 0) {
  	memset (p, 0, padding + 8);
  	little_endian (instance->md5_block, 16);
  	md5_transform (instance->md5_hash, instance->md5_block);
  	p = (char *)instance->md5_block;
  	padding = 56;
      }
  
      memset (p, 0, padding);
      instance->md5_block[14] = instance->md5_bytes << 3;
      instance->md5_block[15] = instance->md5_bytes >> 29;
      little_endian (instance->md5_block, 14);
      md5_transform (instance->md5_hash, instance->md5_block);
  
      printf ("%08x%08x%08x%08x *%d.pgm\n", swap (instance->md5_hash[0]),
  	    swap (instance->md5_hash[1]) , swap (instance->md5_hash[2]),
  	    swap (instance->md5_hash[3]), instance->framenum++);
  }
  
  vo_instance_t * vo_md5_open (void)
  {
      return internal_open (md5_draw_frame, md5_writer);
  }
  