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+/*
+ * 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.
+ */
+
+// Decode With Drops Example
+// =========================
+//
+// This is an example utility which drops a series of frames, as specified
+// on the command line. This is useful for observing the error recovery
+// features of the codec.
+//
+// Usage
+// -----
+// This example adds a single argument to the `simple_decoder` example,
+// which specifies the range or pattern of frames to drop. The parameter is
+// parsed as follows:
+//
+// Dropping A Range Of Frames
+// --------------------------
+// To drop a range of frames, specify the starting frame and the ending
+// frame to drop, separated by a dash. The following command will drop
+// frames 5 through 10 (base 1).
+//
+// $ ./decode_with_drops in.ivf out.i420 5-10
+//
+//
+// Dropping A Pattern Of Frames
+// ----------------------------
+// To drop a pattern of frames, specify the number of frames to drop and
+// the number of frames after which to repeat the pattern, separated by
+// a forward-slash. The following command will drop 3 of 7 frames.
+// Specifically, it will decode 4 frames, then drop 3 frames, and then
+// repeat.
+//
+// $ ./decode_with_drops in.ivf out.i420 3/7
+//
+//
+// Extra Variables
+// ---------------
+// This example maintains the pattern passed on the command line in the
+// `n`, `m`, and `is_range` variables:
+//
+//
+// Making The Drop Decision
+// ------------------------
+// The example decides whether to drop the frame based on the current
+// frame number, immediately before decoding the frame.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+ fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\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;
+ int n = 0;
+ int m = 0;
+ int is_range = 0;
+ char *nptr = NULL;
+
+ exec_name = argv[0];
+
+ if (argc != 4) 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]);
+
+ n = (int)strtol(argv[3], &nptr, 0);
+ m = (int)strtol(nptr + 1, NULL, 0);
+ is_range = (*nptr == '-');
+ if (!n || !m || (*nptr != '-' && *nptr != '/'))
+ die("Couldn't parse pattern %s.\n", argv[3]);
+
+ 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;
+ int skip;
+ const unsigned char *frame =
+ aom_video_reader_get_frame(reader, &frame_size);
+ ++frame_cnt;
+
+ skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
+ (!is_range && m - (frame_cnt - 1) % m <= n);
+
+ if (!skip) {
+ putc('.', stdout);
+ 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)
+ aom_img_write(img, outfile);
+ } else {
+ putc('X', stdout);
+ }
+
+ fflush(stdout);
+ }
+
+ printf("Processed %d frames.\n", frame_cnt);
+ if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+ printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
+ info->frame_width, info->frame_height, argv[2]);
+
+ aom_video_reader_close(reader);
+ fclose(outfile);
+
+ return EXIT_SUCCESS;
+}