155 lines
4.4 KiB
C
155 lines
4.4 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Decode With Drops Example
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// =========================
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//
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// This is an example utility which drops a series of frames, as specified
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// on the command line. This is useful for observing the error recovery
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// features of the codec.
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//
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// Usage
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// -----
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// This example adds a single argument to the `simple_decoder` example,
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// which specifies the range or pattern of frames to drop. The parameter is
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// parsed as follows:
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//
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// Dropping A Range Of Frames
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// --------------------------
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// To drop a range of frames, specify the starting frame and the ending
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// frame to drop, separated by a dash. The following command will drop
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// frames 5 through 10 (base 1).
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//
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// $ ./decode_with_drops in.ivf out.i420 5-10
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//
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//
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// Dropping A Pattern Of Frames
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// ----------------------------
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// To drop a pattern of frames, specify the number of frames to drop and
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// the number of frames after which to repeat the pattern, separated by
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// a forward-slash. The following command will drop 3 of 7 frames.
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// Specifically, it will decode 4 frames, then drop 3 frames, and then
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// repeat.
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//
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// $ ./decode_with_drops in.ivf out.i420 3/7
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//
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//
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// Extra Variables
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// ---------------
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// This example maintains the pattern passed on the command line in the
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// `n`, `m`, and `is_range` variables:
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//
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//
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// Making The Drop Decision
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// ------------------------
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// The example decides whether to drop the frame based on the current
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// frame number, immediately before decoding the frame.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define VPX_CODEC_DISABLE_COMPAT 1
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#include "vpx/vp8dx.h"
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#include "vpx/vpx_decoder.h"
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#include "./tools_common.h"
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#include "./video_reader.h"
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#include "./vpx_config.h"
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static const char *exec_name;
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void usage_exit() {
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fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name);
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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;
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FILE *outfile = NULL;
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vpx_codec_ctx_t codec;
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const VpxInterface *decoder = NULL;
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VpxVideoReader *reader = NULL;
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const VpxVideoInfo *info = NULL;
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int n = 0;
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int m = 0;
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int is_range = 0;
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char *nptr = NULL;
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exec_name = argv[0];
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if (argc != 4)
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die("Invalid number of arguments.");
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reader = vpx_video_reader_open(argv[1]);
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if (!reader)
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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);
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m = strtol(nptr + 1, NULL, 0);
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is_range = (*nptr == '-');
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if (!n || !m || (*nptr != '-' && *nptr != '/'))
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die("Couldn't parse pattern %s.\n", argv[3]);
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info = vpx_video_reader_get_info(reader);
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decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
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if (!decoder)
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die("Unknown input codec.");
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printf("Using %s\n", vpx_codec_iface_name(decoder->interface()));
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if (vpx_codec_dec_init(&codec, decoder->interface(), NULL, 0))
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die_codec(&codec, "Failed to initialize decoder.");
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while (vpx_video_reader_read_frame(reader)) {
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vpx_codec_iter_t iter = NULL;
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vpx_image_t *img = NULL;
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size_t frame_size = 0;
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int skip;
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const unsigned char *frame = vpx_video_reader_get_frame(reader,
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&frame_size);
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if (vpx_codec_decode(&codec, frame, frame_size, NULL, 0))
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die_codec(&codec, "Failed to decode frame.");
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++frame_cnt;
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skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
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(!is_range && m - (frame_cnt - 1) % m <= n);
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if (!skip) {
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putc('.', stdout);
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while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL)
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vpx_img_write(img, outfile);
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} else {
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putc('X', stdout);
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}
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fflush(stdout);
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}
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printf("Processed %d frames.\n", frame_cnt);
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if (vpx_codec_destroy(&codec))
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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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vpx_video_reader_close(reader);
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fclose(outfile);
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return EXIT_SUCCESS;
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}
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