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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/examples/decode_to_md5.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/third_party/aom/examples/decode_to_md5.c b/third_party/aom/examples/decode_to_md5.c new file mode 100644 index 0000000000..07f788ff97 --- /dev/null +++ b/third_party/aom/examples/decode_to_md5.c @@ -0,0 +1,130 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +// 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 <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "aom/aom_decoder.h" +#include "aom/aomdx.h" +#include "common/md5_utils.h" +#include "common/tools_common.h" +#include "common/video_reader.h" + +static void get_image_md5(const aom_image_t *img, unsigned char digest[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(digest, &md5); +} + +static void print_md5(FILE *stream, unsigned char digest[16]) { + int i; + + for (i = 0; i < 16; ++i) fprintf(stream, "%02x", digest[i]); +} + +static const char *exec_name; + +void usage_exit(void) { + fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name); + exit(EXIT_FAILURE); +} + +int main(int argc, char **argv) { + int frame_cnt = 0; + FILE *outfile = NULL; + AvxVideoReader *reader = NULL; + const AvxVideoInfo *info = NULL; + + exec_name = argv[0]; + + if (argc != 3) die("Invalid number of arguments."); + + reader = aom_video_reader_open(argv[1]); + if (!reader) die("Failed to open %s for reading.", argv[1]); + + if (!(outfile = fopen(argv[2], "wb"))) + die("Failed to open %s for writing.", argv[2]); + + info = aom_video_reader_get_info(reader); + + aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc); + if (!decoder) die("Unknown input codec."); + + printf("Using %s\n", aom_codec_iface_name(decoder)); + + aom_codec_ctx_t codec; + if (aom_codec_dec_init(&codec, decoder, NULL, 0)) + die("Failed to initialize decoder"); + + while (aom_video_reader_read_frame(reader)) { + aom_codec_iter_t iter = NULL; + aom_image_t *img = NULL; + size_t frame_size = 0; + const unsigned char *frame = + aom_video_reader_get_frame(reader, &frame_size); + if (aom_codec_decode(&codec, frame, frame_size, NULL)) + die_codec(&codec, "Failed to decode frame"); + + while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) { + unsigned char digest[16]; + + get_image_md5(img, digest); + print_md5(outfile, digest); + fprintf(outfile, " img-%ux%u-%04d.i420\n", img->d_w, img->d_h, + ++frame_cnt); + } + } + + printf("Processed %d frames.\n", frame_cnt); + if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec."); + + aom_video_reader_close(reader); + + fclose(outfile); + return EXIT_SUCCESS; +} |