| AOMedia AV1 Codec

decode_with_drops
1/*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12// Decode With Drops Example
13// =========================
14//
15// This is an example utility which drops a series of frames, as specified
16// on the command line. This is useful for observing the error recovery
17// features of the codec.
18//
19// Usage
20// -----
21// This example adds a single argument to the `simple_decoder` example,
22// which specifies the range or pattern of frames to drop. The parameter is
23// parsed as follows:
24//
25// Dropping A Range Of Frames
26// --------------------------
27// To drop a range of frames, specify the starting frame and the ending
28// frame to drop, separated by a dash. The following command will drop
29// frames 5 through 10 (base 1).
30//
31// $ ./decode_with_drops in.ivf out.i420 5-10
32//
33//
34// Dropping A Pattern Of Frames
35// ----------------------------
36// To drop a pattern of frames, specify the number of frames to drop and
37// the number of frames after which to repeat the pattern, separated by
38// a forward-slash. The following command will drop 3 of 7 frames.
39// Specifically, it will decode 4 frames, then drop 3 frames, and then
40// repeat.
41//
42// $ ./decode_with_drops in.ivf out.i420 3/7
43//
44//
45// Extra Variables
46// ---------------
47// This example maintains the pattern passed on the command line in the
48// `n`, `m`, and `is_range` variables:
49//
50//
51// Making The Drop Decision
52// ------------------------
53// The example decides whether to drop the frame based on the current
54// frame number, immediately before decoding the frame.
55
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59
60#include "aom/aom_decoder.h"
61#include "aom/aomdx.h"
62#include "common/tools_common.h"
63#include "common/video_reader.h"
64
65 static const char *exec_name;
66
67 void usage_exit(void) {
68 fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name);
69 exit(EXIT_FAILURE);
70}
71
72 int main(int argc, char **argv) {
73 int frame_cnt = 0;
74 FILE *outfile = NULL;
75 AvxVideoReader *reader = NULL;
76 const AvxVideoInfo *info = NULL;
77 int n = 0;
78 int m = 0;
79 int is_range = 0;
80 char *nptr = NULL;
81
82 exec_name = argv[0];
83
84 if (argc != 4) die("Invalid number of arguments.");
85
86 reader = aom_video_reader_open(argv[1]);
87 if (!reader) die("Failed to open %s for reading.", argv[1]);
88
89 if (!(outfile = fopen(argv[2], "wb")))
90 die("Failed to open %s for writing.", argv[2]);
91
92 n = (int)strtol(argv[3], &nptr, 0);
93 m = (int)strtol(nptr + 1, NULL, 0);
94 is_range = (*nptr == '-');
95 if (!n || !m || (*nptr != '-' && *nptr != '/'))
96 die("Couldn't parse pattern %s.\n", argv[3]);
97
98 info = aom_video_reader_get_info(reader);
99
100 aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
101 if (!decoder) die("Unknown input codec.");
102
103 printf("Using %s\n", aom_codec_iface_name(decoder));
104 aom_codec_ctx_t codec;
105 if (aom_codec_dec_init(&codec, decoder, NULL, 0))
106 die("Failed to initialize decoder.");
107
108 while (aom_video_reader_read_frame(reader)) {
109 aom_codec_iter_t iter = NULL;
110 aom_image_t *img = NULL;
111 size_t frame_size = 0;
112 int skip;
113 const unsigned char *frame =
114 aom_video_reader_get_frame(reader, &frame_size);
115 ++frame_cnt;
116
117 skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
118 (!is_range && m - (frame_cnt - 1) % m <= n);
119
120 if (!skip) {
121 putc('.', stdout);
122 if (aom_codec_decode(&codec, frame, frame_size, NULL))
123 die_codec(&codec, "Failed to decode frame.");
124
125 while ((img = aom_codec_get_frame(&codec, &iter)) != NULL)
126 aom_img_write(img, outfile);
127 } else {
128 putc('X', stdout);
129 }
130
131 fflush(stdout);
132 }
133
134 printf("Processed %d frames.\n", frame_cnt);
135 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
136
137 printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
138 info->frame_width, info->frame_height, argv[2]);
139
140 aom_video_reader_close(reader);
141 fclose(outfile);
142
143 return EXIT_SUCCESS;
144}
aom_decoder.h
Describes the decoder algorithm interface to applications.
aomdx.h
Provides definitions for using AOM or AV1 within the aom Decoder interface.
aom_codec_iface_name
const char * aom_codec_iface_name(aom_codec_iface_t *iface)
Return the name for a given interface.
aom_codec_iface_t
const struct aom_codec_iface aom_codec_iface_t
Codec interface structure.
Definition aom_codec.h:271
aom_codec_destroy
aom_codec_err_t aom_codec_destroy(aom_codec_ctx_t *ctx)
Destroy a codec instance.
aom_codec_iter_t
const void * aom_codec_iter_t
Iterator.
Definition aom_codec.h:305
aom_codec_get_frame
aom_image_t * aom_codec_get_frame(aom_codec_ctx_t *ctx, aom_codec_iter_t *iter)
Decoded frames iterator.
aom_codec_decode
aom_codec_err_t aom_codec_decode(aom_codec_ctx_t *ctx, const uint8_t *data, size_t data_sz, void *user_priv)
Decode data.
aom_codec_dec_init
#define aom_codec_dec_init(ctx, iface, cfg, flags)
Convenience macro for aom_codec_dec_init_ver()
Definition aom_decoder.h:129
aom_codec_ctx
Codec context structure.
Definition aom_codec.h:315
aom_image
Image Descriptor.
Definition aom_image.h:182