/* * Copyright (c) 2010 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ // Frame-by-frame MD5 Checksum // =========================== // // This example builds upon the simple decoder loop to show how checksums // of the decoded output can be generated. These are used for validating // decoder implementations against the reference implementation, for example. // // MD5 algorithm // ------------- // The Message-Digest 5 (MD5) is a well known hash function. We have provided // an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest // Algorithm for your use. Our implmentation only changes the interface of this // reference code. You must include the `md5_utils.h` header for access to these // functions. // // Processing The Decoded Data // --------------------------- // Each row of the image is passed to the MD5 accumulator. First the Y plane // is processed, then U, then V. It is important to honor the image's `stride` // values. #include #include #include #include #define VPX_CODEC_DISABLE_COMPAT 1 #include "./vpx_config.h" #include "vpx/vp8dx.h" #include "vpx/vpx_decoder.h" #define interface (vpx_codec_vp8_dx()) #include "md5_utils.h" #define IVF_FILE_HDR_SZ (32) #define IVF_FRAME_HDR_SZ (12) static unsigned int mem_get_le32(const unsigned char *mem) { return (mem[3] << 24) | (mem[2] << 16) | (mem[1] << 8) | (mem[0]); } static void die(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vprintf(fmt, ap); if(fmt[strlen(fmt)-1] != '\n') printf("\n"); exit(EXIT_FAILURE); } static void die_codec(vpx_codec_ctx_t *ctx, const char *s) { const char *detail = vpx_codec_error_detail(ctx); printf("%s: %s\n", s, vpx_codec_error(ctx)); if(detail) printf(" %s\n",detail); exit(EXIT_FAILURE); } static void get_image_md5(const vpx_image_t *img, unsigned char md5_sum[16]) { int plane, y; MD5Context md5; MD5Init(&md5); for (plane = 0; plane < 3; ++plane) { const unsigned char *buf = img->planes[plane]; const int stride = img->stride[plane]; const int w = plane ? (img->d_w + 1) >> 1 : img->d_w; const int h = plane ? (img->d_h + 1) >> 1 : img->d_h; for (y = 0; y < h; ++y) { MD5Update(&md5, buf, w); buf += stride; } } MD5Final(md5_sum, &md5); } int main(int argc, char **argv) { FILE *infile, *outfile; vpx_codec_ctx_t codec; int flags = 0, frame_cnt = 0; unsigned char file_hdr[IVF_FILE_HDR_SZ]; unsigned char frame_hdr[IVF_FRAME_HDR_SZ]; unsigned char frame[256 * 1024]; if (argc != 3) die("Usage: %s \n", argv[0]); if (!(infile = fopen(argv[1], "rb"))) die("Failed to open %s for reading", argv[1]); if (!(outfile = fopen(argv[2], "wb"))) die("Failed to open %s for writing", argv[2]); if (!(fread(file_hdr, 1, IVF_FILE_HDR_SZ, infile) == IVF_FILE_HDR_SZ && file_hdr[0] == 'D' && file_hdr[1] == 'K' && file_hdr[2] == 'I' && file_hdr[3] == 'F')) die("%s is not an IVF file.", argv[1]); printf("Using %s\n",vpx_codec_iface_name(interface)); if (vpx_codec_dec_init(&codec, interface, NULL, flags)) die_codec(&codec, "Failed to initialize decoder"); while (fread(frame_hdr, 1, IVF_FRAME_HDR_SZ, infile) == IVF_FRAME_HDR_SZ) { const int frame_size = mem_get_le32(frame_hdr); vpx_codec_iter_t iter = NULL; vpx_image_t *img; frame_cnt++; if (frame_size > sizeof(frame)) die("Frame %d data too big for example code buffer", frame_size); if (fread(frame, 1, frame_size, infile) != frame_size) die("Frame %d failed to read complete frame", frame_cnt); if (vpx_codec_decode(&codec, frame, frame_size, NULL, 0)) die_codec(&codec, "Failed to decode frame"); while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) { int i; unsigned char md5_sum[16]; get_image_md5(img, md5_sum); for (i = 0; i < 16; ++i) fprintf(outfile, "%02x", md5_sum[i]); fprintf(outfile, " img-%dx%d-%04d.i420\n", img->d_w, img->d_h, frame_cnt); } } printf("Processed %d frames.\n", frame_cnt); if (vpx_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec"); fclose(outfile); fclose(infile); return EXIT_SUCCESS; }