decode_with_drops
/*
* 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;
}
aom_decoder.h
Describes the decoder algorithm interface to applications.
aom_image_t
struct aom_image aom_image_t
Image Descriptor.
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_ctx_t
struct aom_codec_ctx aom_codec_ctx_t
Codec context structure.
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:133