1856f2213d
The RSA Data Security, Inc. implementation license bears a requirement similar to the old problematic BSD license with advertising clause. Change-Id: I877b71ff0548934b1c4fd87245696f53dedbdf26
49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
@TEMPLATE decoder_tmpl.c
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Frame-by-frame MD5 Checksum
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===========================
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION
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This example builds upon the simple decoder loop to show how checksums
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of the decoded output can be generated. These are used for validating
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decoder implementations against the reference implementation, for example.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ INTRODUCTION
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MD5 algorithm
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-------------
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The Message-Digest 5 (MD5) is a well known hash function. We have provided
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an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
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Algorithm for your use. Our implmentation only changes the interface of this
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reference code. You must include the `md5_utils.h` header for access to these
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functions.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_INCLUDES
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#include "md5_utils.h"
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ EXTRA_INCLUDES
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Processing The Decoded Data
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---------------------------
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Each row of the image is passed to the MD5 accumulator. First the Y plane
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is processed, then U, then V. It is important to honor the image's `stride`
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values.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PROCESS_DX
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unsigned char md5_sum[16];
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MD5Context md5;
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int i;
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MD5Init(&md5);
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for(plane=0; plane < 3; plane++) {
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unsigned char *buf =img->planes[plane];
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for(y=0; y<img->d_h >> (plane?1:0); y++) {
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MD5Update(&md5, buf, img->d_w >> (plane?1:0));
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buf += img->stride[plane];
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}
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}
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MD5Final(md5_sum, &md5);
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for(i=0; i<16; i++)
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fprintf(outfile, "%02x",md5_sum[i]);
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fprintf(outfile, " img-%dx%d-%04d.i420\n", img->d_w, img->d_h,
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frame_cnt);
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PROCESS_DX
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