examples/postproc.c

   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
  55 static const char *exec_name;
  56
  57 void usage_exit() {
  58   fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
  59   exit(EXIT_FAILURE);
  60 }
  61
  62 int 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->codec_interface()));
  90
  91   res = vpx_codec_dec_init(&codec, decoder->codec_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 }