| /* |
| * 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; |
| } |