decode_with_drops.c 4.41 KB
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/*
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 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
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 *
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 * 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.
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 */

// 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>
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#include "aom/vp8dx.h"
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#include "aom/aom_decoder.h"
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#include "../tools_common.h"
#include "../video_reader.h"
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#include "./aom_config.h"
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static const char *exec_name;
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void usage_exit(void) {
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  fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name);
  exit(EXIT_FAILURE);
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}

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int main(int argc, char **argv) {
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  int frame_cnt = 0;
  FILE *outfile = NULL;
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  aom_codec_ctx_t codec;
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  const VpxInterface *decoder = NULL;
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  VpxVideoReader *reader = NULL;
  const VpxVideoInfo *info = NULL;
  int n = 0;
  int m = 0;
  int is_range = 0;
  char *nptr = NULL;
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  exec_name = argv[0];
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  if (argc != 4) die("Invalid number of arguments.");
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  reader = aom_video_reader_open(argv[1]);
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  if (!reader) die("Failed to open %s for reading.", argv[1]);
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  if (!(outfile = fopen(argv[2], "wb")))
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    die("Failed to open %s for writing.", argv[2]);
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  n = strtol(argv[3], &nptr, 0);
  m = strtol(nptr + 1, NULL, 0);
  is_range = (*nptr == '-');
  if (!n || !m || (*nptr != '-' && *nptr != '/'))
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    die("Couldn't parse pattern %s.\n", argv[3]);
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  info = aom_video_reader_get_info(reader);
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  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
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  if (!decoder) die("Unknown input codec.");
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  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
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  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
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    die_codec(&codec, "Failed to initialize decoder.");
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  while (aom_video_reader_read_frame(reader)) {
    aom_codec_iter_t iter = NULL;
    aom_image_t *img = NULL;
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    size_t frame_size = 0;
    int skip;
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    const unsigned char *frame =
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        aom_video_reader_get_frame(reader, &frame_size);
    if (aom_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0))
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      die_codec(&codec, "Failed to decode frame.");
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    ++frame_cnt;

    skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
           (!is_range && m - (frame_cnt - 1) % m <= n);

    if (!skip) {
      putc('.', stdout);

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      while ((img = aom_codec_get_frame(&codec, &iter)) != NULL)
        aom_img_write(img, outfile);
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    } else {
      putc('X', stdout);
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    }

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    fflush(stdout);
  }

  printf("Processed %d frames.\n", frame_cnt);
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  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
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  printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
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         info->frame_width, info->frame_height, argv[2]);
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  aom_video_reader_close(reader);
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  fclose(outfile);

  return EXIT_SUCCESS;
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}