postproc.c 4.49 KB
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/*
 *  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>
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#include "vpx/vp8dx.h"
#include "vpx/vpx_decoder.h"

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#include "../tools_common.h"
#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(void) {
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  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
  exit(EXIT_FAILURE);
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}

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int main(int argc, char **argv) {
  int frame_cnt = 0;
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  FILE *outfile = NULL;
  vpx_codec_ctx_t codec;
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  vpx_codec_err_t res;
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  VpxVideoReader *reader = NULL;
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  const VpxInterface *decoder = NULL;
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  const VpxVideoInfo *info = NULL;
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  exec_name = argv[0];
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  if (argc != 3) die("Invalid number of arguments.");
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  reader = vpx_video_reader_open(argv[1]);
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  if (!reader) die("Failed to open %s for reading.", argv[1]);
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  if (!(outfile = fopen(argv[2], "wb")))
    die("Failed to open %s for writing", argv[2]);
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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) die("Unknown input codec.");
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  printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface()));
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  res = vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL,
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                           VPX_CODEC_USE_POSTPROC);
  if (res == VPX_CODEC_INCAPABLE)
    die_codec(&codec, "Postproc not supported by this decoder.");
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  if (res) 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;
    vpx_image_t *img = NULL;
    size_t frame_size = 0;
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    const unsigned char *frame =
        vpx_video_reader_get_frame(reader, &frame_size);
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    ++frame_cnt;

    if (frame_cnt % 30 == 1) {
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      vp8_postproc_cfg_t pp = { 0, 0, 0 };
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      if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
        die_codec(&codec, "Failed to turn off postproc.");
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    } else if (frame_cnt % 30 == 16) {
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      vp8_postproc_cfg_t pp = { VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE, 4,
                                0 };
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      if (vpx_codec_control(&codec, VP8_SET_POSTPROC, &pp))
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        die_codec(&codec, "Failed to turn on postproc.");
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    };

    // Decode the frame with 15ms deadline
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    if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 15000))
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      die_codec(&codec, "Failed to decode frame");

    while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
      vpx_img_write(img, outfile);
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    }
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  }

  printf("Processed %d frames.\n", frame_cnt);
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  if (vpx_codec_destroy(&codec)) 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);
  return EXIT_SUCCESS;
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}