1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11// Postprocessing Decoder
12// ======================
13//
14// This example adds postprocessing to the simple decoder loop.
15//
16// Initializing Postprocessing
17// ---------------------------
18// You must inform the codec that you might request postprocessing at
19// initialization time. This is done by passing the VPX_CODEC_USE_POSTPROC
20// flag to `vpx_codec_dec_init`. If the codec does not support
21// postprocessing, this call will return VPX_CODEC_INCAPABLE. For
22// demonstration purposes, we also fall back to default initialization if
23// the codec does not provide support.
24//
25// Using Adaptive Postprocessing
26// -----------------------------
27// VP6 provides "adaptive postprocessing." It will automatically select the
28// best postprocessing filter on a frame by frame basis based on the amount
29// of time remaining before the user's specified deadline expires. The
30// special value 0 indicates that the codec should take as long as
31// necessary to provide the best quality frame. This example gives the
32// codec 15ms (15000us) to return a frame. Remember that this is a soft
33// deadline, and the codec may exceed it doing its regular processing. In
34// these cases, no additional postprocessing will be done.
35//
36// Codec Specific Postprocessing Controls
37// --------------------------------------
38// Some codecs provide fine grained controls over their built-in
39// postprocessors. VP8 is one example. The following sample code toggles
40// postprocessing on and off every 15 frames.
41
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45
46#define VPX_CODEC_DISABLE_COMPAT 1
47
48#include "vpx/vp8dx.h"
49#include "vpx/vpx_decoder.h"
50
51#include "./tools_common.h"
52#include "./video_reader.h"
53#include "./vpx_config.h"
54
55static const char *exec_name;
56
57void usage_exit() {
58  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
59  exit(EXIT_FAILURE);
60}
61
62int main(int argc, char **argv) {
63  int frame_cnt = 0;
64  FILE *outfile = NULL;
65  vpx_codec_ctx_t codec;
66  vpx_codec_err_t res;
67  VpxVideoReader *reader = NULL;
68  const VpxInterface *decoder = NULL;
69  const VpxVideoInfo *info = NULL;
70
71  exec_name = argv[0];
72
73  if (argc != 3)
74    die("Invalid number of arguments.");
75
76  reader = vpx_video_reader_open(argv[1]);
77  if (!reader)
78    die("Failed to open %s for reading.", argv[1]);
79
80  if (!(outfile = fopen(argv[2], "wb")))
81    die("Failed to open %s for writing", argv[2]);
82
83  info = vpx_video_reader_get_info(reader);
84
85  decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
86  if (!decoder)
87    die("Unknown input codec.");
88
89  printf("Using %s\n", vpx_codec_iface_name(decoder->interface()));
90
91  res = vpx_codec_dec_init(&codec, decoder->interface(), NULL,
92                           VPX_CODEC_USE_POSTPROC);
93  if (res == VPX_CODEC_INCAPABLE)
94    die_codec(&codec, "Postproc not supported by this decoder.");
95
96  if (res)
97    die_codec(&codec, "Failed to initialize decoder.");
98
99  while (vpx_video_reader_read_frame(reader)) {
100    vpx_codec_iter_t iter = NULL;
101    vpx_image_t *img = NULL;
102    size_t frame_size = 0;
103    const unsigned char *frame = vpx_video_reader_get_frame(reader,
104                                                            &frame_size);
105
106    ++frame_cnt;
107
108    if (frame_cnt % 30 == 1) {
109      vp8_postproc_cfg_t pp = {0, 0, 0};
110
111    if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
112      die_codec(&codec, "Failed to turn off postproc.");
113    } else if (frame_cnt % 30 == 16) {
114      vp8_postproc_cfg_t pp = {VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE,
115                               4, 0};
116      if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
117        die_codec(&codec, "Failed to turn on postproc.");
118    };
119
120    // Decode the frame with 15ms deadline
121    if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))
122      die_codec(&codec, "Failed to decode frame");
123
124    while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
125      vpx_img_write(img, outfile);
126    }
127  }
128
129  printf("Processed %d frames.\n", frame_cnt);
130  if (vpx_codec_destroy(&codec))
131    die_codec(&codec, "Failed to destroy codec");
132
133  printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
134         info->frame_width, info->frame_height, argv[2]);
135
136  vpx_video_reader_close(reader);
137
138  fclose(outfile);
139  return EXIT_SUCCESS;
140}
141