/* *  Copyright (c) 2010 The WebM project authors. All Rights Reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS.  All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */ // Postprocessing Decoder// ======================//// This example adds postprocessing to the simple decoder loop.//// Initializing Postprocessing// ---------------------------// You must inform the codec that you might request postprocessing at// initialization time. This is done by passing the VPX_CODEC_USE_POSTPROC// flag to `vpx_codec_dec_init`. If the codec does not support// postprocessing, this call will return VPX_CODEC_INCAPABLE. For// demonstration purposes, we also fall back to default initialization if// the codec does not provide support.//// Using Adaptive Postprocessing// -----------------------------// VP6 provides "adaptive postprocessing." It will automatically select the// best postprocessing filter on a frame by frame basis based on the amount// of time remaining before the user's specified deadline expires. The// special value 0 indicates that the codec should take as long as// necessary to provide the best quality frame. This example gives the// codec 15ms (15000us) to return a frame. Remember that this is a soft// deadline, and the codec may exceed it doing its regular processing. In// these cases, no additional postprocessing will be done.//// Codec Specific Postprocessing Controls// --------------------------------------// Some codecs provide fine grained controls over their built-in// postprocessors. VP8 is one example. The following sample code toggles// postprocessing on and off every 15 frames. #include <stdio.h>#include <stdlib.h>#include <string.h> #include "vpx/vp8dx.h"#include "vpx/vpx_decoder.h" #include "../tools_common.h"#include "../video_reader.h"#include "./vpx_config.h" static const char *exec_name; void usage_exit() {  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);  exit(EXIT_FAILURE);} int main(int argc, char **argv) {  int frame_cnt = 0;  FILE *outfile = NULL;  vpx_codec_ctx_t codec;  vpx_codec_err_t res;  VpxVideoReader *reader = NULL;  const VpxInterface *decoder = NULL;  const VpxVideoInfo *info = NULL;   exec_name = argv[0];   if (argc != 3)    die("Invalid number of arguments.");   reader = vpx_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]);   info = vpx_video_reader_get_info(reader);   decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);  if (!decoder)    die("Unknown input codec.");   printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface()));   res = vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL,                           VPX_CODEC_USE_POSTPROC);  if (res == VPX_CODEC_INCAPABLE)    die_codec(&codec, "Postproc not supported by this decoder.");   if (res)    die_codec(&codec, "Failed to initialize decoder.");   while (vpx_video_reader_read_frame(reader)) {    vpx_codec_iter_t iter = NULL;    vpx_image_t *img = NULL;    size_t frame_size = 0;    const unsigned char *frame = vpx_video_reader_get_frame(reader,                                                            &frame_size);     ++frame_cnt;     if (frame_cnt % 30 == 1) {      vp8_postproc_cfg_t pp = {0, 0, 0};     if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))      die_codec(&codec, "Failed to turn off postproc.");    } else if (frame_cnt % 30 == 16) {      vp8_postproc_cfg_t pp = {VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE,                               4, 0};      if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))        die_codec(&codec, "Failed to turn on postproc.");    };     // Decode the frame with 15ms deadline    if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))      die_codec(&codec, "Failed to decode frame");     while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {      vpx_img_write(img, outfile);    }  }   printf("Processed %d frames.\n", frame_cnt);  if (vpx_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]);   vpx_video_reader_close(reader);   fclose(outfile);  return EXIT_SUCCESS;}