vpxdec.c 28.5 KB
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/*
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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
 *  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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#include <assert.h>
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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
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#include <limits.h>
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#include "third_party/libyuv/include/libyuv/scale.h"

#include "./args.h"
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#include "./ivfdec.h"

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#define VPX_CODEC_DISABLE_COMPAT 1
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#include "./vpx_config.h"
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#include "vpx/vpx_decoder.h"
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#include "vpx_ports/vpx_timer.h"
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#if CONFIG_VP8_DECODER || CONFIG_VP9_DECODER
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#include "vpx/vp8dx.h"
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#endif
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#if CONFIG_MD5
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#include "./md5_utils.h"
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#endif
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#include "./tools_common.h"
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#include "./webmdec.h"
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static const char *exec_name;

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static const struct {
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  char const *name;
  const vpx_codec_iface_t *(*iface)(void);
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  uint32_t fourcc;
  uint32_t fourcc_mask;
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} ifaces[] = {
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#if CONFIG_VP8_DECODER
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  {"vp8",  vpx_codec_vp8_dx,   VP8_FOURCC_MASK, 0x00FFFFFF},
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#endif
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#if CONFIG_VP9_DECODER
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  {"vp9",  vpx_codec_vp9_dx,   VP9_FOURCC_MASK, 0x00FFFFFF},
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#endif
};

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struct VpxDecInputContext {
  struct VpxInputContext *vpx_input_ctx;
  struct WebmInputContext *webm_ctx;
};

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static const arg_def_t looparg = ARG_DEF(NULL, "loops", 1,
                                          "Number of times to decode the file");
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static const arg_def_t codecarg = ARG_DEF(NULL, "codec", 1,
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                                          "Codec to use");
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static const arg_def_t use_yv12 = ARG_DEF(NULL, "yv12", 0,
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                                          "Output raw YV12 frames");
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static const arg_def_t use_i420 = ARG_DEF(NULL, "i420", 0,
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                                          "Output raw I420 frames");
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static const arg_def_t flipuvarg = ARG_DEF(NULL, "flipuv", 0,
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                                           "Flip the chroma planes in the output");
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static const arg_def_t noblitarg = ARG_DEF(NULL, "noblit", 0,
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                                           "Don't process the decoded frames");
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static const arg_def_t progressarg = ARG_DEF(NULL, "progress", 0,
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                                             "Show progress after each frame decodes");
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static const arg_def_t limitarg = ARG_DEF(NULL, "limit", 1,
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                                          "Stop decoding after n frames");
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static const arg_def_t skiparg = ARG_DEF(NULL, "skip", 1,
                                         "Skip the first n input frames");
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static const arg_def_t postprocarg = ARG_DEF(NULL, "postproc", 0,
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                                             "Postprocess decoded frames");
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static const arg_def_t summaryarg = ARG_DEF(NULL, "summary", 0,
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                                            "Show timing summary");
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static const arg_def_t outputfile = ARG_DEF("o", "output", 1,
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                                            "Output file name pattern (see below)");
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static const arg_def_t threadsarg = ARG_DEF("t", "threads", 1,
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                                            "Max threads to use");
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static const arg_def_t verbosearg = ARG_DEF("v", "verbose", 0,
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                                            "Show version string");
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static const arg_def_t error_concealment = ARG_DEF(NULL, "error-concealment", 0,
                                                   "Enable decoder error-concealment");
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static const arg_def_t scalearg = ARG_DEF("S", "scale", 0,
                                            "Scale output frames uniformly");
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#if CONFIG_MD5
static const arg_def_t md5arg = ARG_DEF(NULL, "md5", 0,
                                        "Compute the MD5 sum of the decoded frame");
#endif
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static const arg_def_t *all_args[] = {
  &codecarg, &use_yv12, &use_i420, &flipuvarg, &noblitarg,
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  &progressarg, &limitarg, &skiparg, &postprocarg, &summaryarg, &outputfile,
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  &threadsarg, &verbosearg, &scalearg,
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#if CONFIG_MD5
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  &md5arg,
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#endif
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  &error_concealment,
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  NULL
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};

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#if CONFIG_VP8_DECODER
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static const arg_def_t addnoise_level = ARG_DEF(NULL, "noise-level", 1,
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                                                "Enable VP8 postproc add noise");
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static const arg_def_t deblock = ARG_DEF(NULL, "deblock", 0,
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                                         "Enable VP8 deblocking");
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static const arg_def_t demacroblock_level = ARG_DEF(NULL, "demacroblock-level", 1,
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                                                    "Enable VP8 demacroblocking, w/ level");
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static const arg_def_t pp_debug_info = ARG_DEF(NULL, "pp-debug-info", 1,
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                                               "Enable VP8 visible debug info");
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static const arg_def_t pp_disp_ref_frame = ARG_DEF(NULL, "pp-dbg-ref-frame", 1,
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                                                   "Display only selected reference frame per macro block");
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static const arg_def_t pp_disp_mb_modes = ARG_DEF(NULL, "pp-dbg-mb-modes", 1,
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                                                  "Display only selected macro block modes");
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static const arg_def_t pp_disp_b_modes = ARG_DEF(NULL, "pp-dbg-b-modes", 1,
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                                                 "Display only selected block modes");
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static const arg_def_t pp_disp_mvs = ARG_DEF(NULL, "pp-dbg-mvs", 1,
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                                             "Draw only selected motion vectors");
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static const arg_def_t mfqe = ARG_DEF(NULL, "mfqe", 0,
                                      "Enable multiframe quality enhancement");
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static const arg_def_t *vp8_pp_args[] = {
  &addnoise_level, &deblock, &demacroblock_level, &pp_debug_info,
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  &pp_disp_ref_frame, &pp_disp_mb_modes, &pp_disp_b_modes, &pp_disp_mvs, &mfqe,
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  NULL
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};
#endif

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void usage_exit() {
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  int i;
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  fprintf(stderr, "Usage: %s <options> filename\n\n"
          "Options:\n", exec_name);
  arg_show_usage(stderr, all_args);
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#if CONFIG_VP8_DECODER
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  fprintf(stderr, "\nVP8 Postprocessing Options:\n");
  arg_show_usage(stderr, vp8_pp_args);
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#endif
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  fprintf(stderr,
          "\nOutput File Patterns:\n\n"
          "  The -o argument specifies the name of the file(s) to "
          "write to. If the\n  argument does not include any escape "
          "characters, the output will be\n  written to a single file. "
          "Otherwise, the filename will be calculated by\n  expanding "
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          "the following escape characters:\n");
  fprintf(stderr,
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          "\n\t%%w   - Frame width"
          "\n\t%%h   - Frame height"
          "\n\t%%<n> - Frame number, zero padded to <n> places (1..9)"
          "\n\n  Pattern arguments are only supported in conjunction "
          "with the --yv12 and\n  --i420 options. If the -o option is "
          "not specified, the output will be\n  directed to stdout.\n"
         );
  fprintf(stderr, "\nIncluded decoders:\n\n");

  for (i = 0; i < sizeof(ifaces) / sizeof(ifaces[0]); i++)
    fprintf(stderr, "    %-6s - %s\n",
            ifaces[i].name,
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            vpx_codec_iface_name(ifaces[i].iface()));
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  exit(EXIT_FAILURE);
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}

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static int read_frame(struct VpxDecInputContext *input,
                      uint8_t **buf,
                      size_t *bytes_in_buffer,
                      size_t *buffer_size) {
  char raw_hdr[RAW_FRAME_HDR_SZ];
  size_t bytes_to_read = 0;
  FILE *infile = input->vpx_input_ctx->file;
  enum VideoFileType kind = input->vpx_input_ctx->file_type;
  if (kind == FILE_TYPE_WEBM) {
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    return webm_read_frame(input->webm_ctx,
                           buf, bytes_in_buffer, buffer_size);
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  } else if (kind == FILE_TYPE_RAW) {
    if (fread(raw_hdr, RAW_FRAME_HDR_SZ, 1, infile) != 1) {
      if (!feof(infile))
        warn("Failed to read RAW frame size\n");
    } else {
      const int kCorruptFrameThreshold = 256 * 1024 * 1024;
      const int kFrameTooSmallThreshold = 256 * 1024;
      bytes_to_read = mem_get_le32(raw_hdr);
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      if (bytes_to_read > kCorruptFrameThreshold) {
        warn("Read invalid frame size (%u)\n", (unsigned int)bytes_to_read);
        bytes_to_read = 0;
      }
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      if (kind == FILE_TYPE_RAW && bytes_to_read < kFrameTooSmallThreshold) {
        warn("Warning: Read invalid frame size (%u) - not a raw file?\n",
             (unsigned int)bytes_to_read);
      }
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      if (bytes_to_read > *buffer_size) {
        uint8_t *new_buf = realloc(*buf, 2 * bytes_to_read);
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        if (new_buf) {
          *buf = new_buf;
          *buffer_size = 2 * bytes_to_read;
        } else {
          warn("Failed to allocate compressed data buffer\n");
          bytes_to_read = 0;
        }
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      }
    }
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    if (!feof(infile)) {
      if (fread(*buf, 1, bytes_to_read, infile) != bytes_to_read) {
        warn("Failed to read full frame\n");
        return 1;
      }
      *bytes_in_buffer = bytes_to_read;
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    }

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    return 0;
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  } else if (kind == FILE_TYPE_IVF) {
    return ivf_read_frame(input->vpx_input_ctx,
                          buf, bytes_in_buffer, buffer_size);
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  }

  return 1;
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}

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void *out_open(const char *out_fn, int do_md5) {
  void *out = NULL;
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  if (do_md5) {
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#if CONFIG_MD5
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    MD5Context *md5_ctx = out = malloc(sizeof(MD5Context));
    (void)out_fn;
    MD5Init(md5_ctx);
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#endif
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  } else {
    FILE *outfile = out = strcmp("-", out_fn) ? fopen(out_fn, "wb")
                          : set_binary_mode(stdout);

    if (!outfile) {
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      fatal("Failed to output file");
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    }
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  }
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  return out;
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}

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void out_put(void *out, const uint8_t *buf, unsigned int len, int do_md5) {
  if (do_md5) {
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#if CONFIG_MD5
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    MD5Update(out, buf, len);
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#endif
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  } else {
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    (void) fwrite(buf, 1, len, out);
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  }
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}

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void out_close(void *out, const char *out_fn, int do_md5) {
  if (do_md5) {
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#if CONFIG_MD5
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    uint8_t md5[16];
    int i;
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    MD5Final(md5, out);
    free(out);
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    for (i = 0; i < 16; i++)
      printf("%02x", md5[i]);
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    printf("  %s\n", out_fn);
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#endif
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  } else {
    fclose(out);
  }
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}

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int file_is_raw(struct VpxInputContext *input) {
  uint8_t buf[32];
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  int is_raw = 0;
  vpx_codec_stream_info_t si;
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  si.sz = sizeof(si);

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  if (fread(buf, 1, 32, input->file) == 32) {
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    int i;

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    if (mem_get_le32(buf) < 256 * 1024 * 1024) {
      for (i = 0; i < sizeof(ifaces) / sizeof(ifaces[0]); i++) {
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        if (!vpx_codec_peek_stream_info(ifaces[i].iface(),
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                                        buf + 4, 32 - 4, &si)) {
          is_raw = 1;
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          input->fourcc = ifaces[i].fourcc;
          input->width = si.w;
          input->height = si.h;
          input->framerate.numerator = 30;
          input->framerate.denominator = 1;
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          break;
        }
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      }
    }
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  }

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  rewind(input->file);
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  return is_raw;
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}

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void show_progress(int frame_in, int frame_out, unsigned long dx_time) {
  fprintf(stderr, "%d decoded frames/%d showed frames in %lu us (%.2f fps)\r",
          frame_in, frame_out, dx_time,
          (float)frame_out * 1000000.0 / (float)dx_time);
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}

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void generate_filename(const char *pattern, char *out, size_t q_len,
                       unsigned int d_w, unsigned int d_h,
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                       unsigned int frame_in) {
  const char *p = pattern;
  char *q = out;

  do {
    char *next_pat = strchr(p, '%');

    if (p == next_pat) {
      size_t pat_len;

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      /* parse the pattern */
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      q[q_len - 1] = '\0';
      switch (p[1]) {
        case 'w':
          snprintf(q, q_len - 1, "%d", d_w);
          break;
        case 'h':
          snprintf(q, q_len - 1, "%d", d_h);
          break;
        case '1':
          snprintf(q, q_len - 1, "%d", frame_in);
          break;
        case '2':
          snprintf(q, q_len - 1, "%02d", frame_in);
          break;
        case '3':
          snprintf(q, q_len - 1, "%03d", frame_in);
          break;
        case '4':
          snprintf(q, q_len - 1, "%04d", frame_in);
          break;
        case '5':
          snprintf(q, q_len - 1, "%05d", frame_in);
          break;
        case '6':
          snprintf(q, q_len - 1, "%06d", frame_in);
          break;
        case '7':
          snprintf(q, q_len - 1, "%07d", frame_in);
          break;
        case '8':
          snprintf(q, q_len - 1, "%08d", frame_in);
          break;
        case '9':
          snprintf(q, q_len - 1, "%09d", frame_in);
          break;
        default:
          die("Unrecognized pattern %%%c\n", p[1]);
      }

      pat_len = strlen(q);
      if (pat_len >= q_len - 1)
        die("Output filename too long.\n");
      q += pat_len;
      p += 2;
      q_len -= pat_len;
    } else {
      size_t copy_len;

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      /* copy the next segment */
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      if (!next_pat)
        copy_len = strlen(p);
      else
        copy_len = next_pat - p;

      if (copy_len >= q_len - 1)
        die("Output filename too long.\n");

      memcpy(q, p, copy_len);
      q[copy_len] = '\0';
      q += copy_len;
      p += copy_len;
      q_len -= copy_len;
    }
  } while (*p);
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}


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int main_loop(int argc, const char **argv_) {
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  vpx_codec_ctx_t       decoder;
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  char                  *fn = NULL;
  int                    i;
  uint8_t               *buf = NULL;
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  size_t                 bytes_in_buffer = 0, buffer_size = 0;
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  FILE                  *infile;
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  int                    frame_in = 0, frame_out = 0, flipuv = 0, noblit = 0;
  int                    do_md5 = 0, progress = 0;
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  int                    stop_after = 0, postproc = 0, summary = 0, quiet = 1;
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  int                    arg_skip = 0;
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  int                    ec_enabled = 0;
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  vpx_codec_iface_t       *iface = NULL;
  unsigned long          dx_time = 0;
  struct arg               arg;
  char                   **argv, **argi, **argj;
  const char             *outfile_pattern = 0;
  char                    outfile[PATH_MAX];
  int                     single_file;
  int                     use_y4m = 1;
  void                   *out = NULL;
  vpx_codec_dec_cfg_t     cfg = {0};
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#if CONFIG_VP8_DECODER
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  vp8_postproc_cfg_t      vp8_pp_cfg = {0};
  int                     vp8_dbg_color_ref_frame = 0;
  int                     vp8_dbg_color_mb_modes = 0;
  int                     vp8_dbg_color_b_modes = 0;
  int                     vp8_dbg_display_mv = 0;
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#endif
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  int                     frames_corrupted = 0;
  int                     dec_flags = 0;
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  int                     do_scale = 0;
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  vpx_image_t             *scaled_img = NULL;
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  int                     frame_avail, got_data;
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  struct VpxDecInputContext input = {0};
  struct VpxInputContext vpx_input_ctx = {0};
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  struct WebmInputContext webm_ctx = {0};
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  input.vpx_input_ctx = &vpx_input_ctx;
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  input.webm_ctx = &webm_ctx;
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  /* Parse command line */
  exec_name = argv_[0];
  argv = argv_dup(argc - 1, argv_ + 1);

  for (argi = argj = argv; (*argj = *argi); argi += arg.argv_step) {
    memset(&arg, 0, sizeof(arg));
    arg.argv_step = 1;

    if (arg_match(&arg, &codecarg, argi)) {
      int j, k = -1;

      for (j = 0; j < sizeof(ifaces) / sizeof(ifaces[0]); j++)
        if (!strcmp(ifaces[j].name, arg.val))
          k = j;

      if (k >= 0)
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        iface = ifaces[k].iface();
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      else
        die("Error: Unrecognized argument (%s) to --codec\n",
            arg.val);
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    } else if (arg_match(&arg, &looparg, argi)) {
      // no-op
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    } else if (arg_match(&arg, &outputfile, argi))
      outfile_pattern = arg.val;
    else if (arg_match(&arg, &use_yv12, argi)) {
      use_y4m = 0;
      flipuv = 1;
    } else if (arg_match(&arg, &use_i420, argi)) {
      use_y4m = 0;
      flipuv = 0;
    } else if (arg_match(&arg, &flipuvarg, argi))
      flipuv = 1;
    else if (arg_match(&arg, &noblitarg, argi))
      noblit = 1;
    else if (arg_match(&arg, &progressarg, argi))
      progress = 1;
    else if (arg_match(&arg, &limitarg, argi))
      stop_after = arg_parse_uint(&arg);
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    else if (arg_match(&arg, &skiparg, argi))
      arg_skip = arg_parse_uint(&arg);
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    else if (arg_match(&arg, &postprocarg, argi))
      postproc = 1;
    else if (arg_match(&arg, &md5arg, argi))
      do_md5 = 1;
    else if (arg_match(&arg, &summaryarg, argi))
      summary = 1;
    else if (arg_match(&arg, &threadsarg, argi))
      cfg.threads = arg_parse_uint(&arg);
    else if (arg_match(&arg, &verbosearg, argi))
      quiet = 0;
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    else if (arg_match(&arg, &scalearg, argi))
      do_scale = 1;
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#if CONFIG_VP8_DECODER
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    else if (arg_match(&arg, &addnoise_level, argi)) {
      postproc = 1;
      vp8_pp_cfg.post_proc_flag |= VP8_ADDNOISE;
      vp8_pp_cfg.noise_level = arg_parse_uint(&arg);
    } else if (arg_match(&arg, &demacroblock_level, argi)) {
      postproc = 1;
      vp8_pp_cfg.post_proc_flag |= VP8_DEMACROBLOCK;
      vp8_pp_cfg.deblocking_level = arg_parse_uint(&arg);
    } else if (arg_match(&arg, &deblock, argi)) {
      postproc = 1;
      vp8_pp_cfg.post_proc_flag |= VP8_DEBLOCK;
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    } else if (arg_match(&arg, &mfqe, argi)) {
      postproc = 1;
      vp8_pp_cfg.post_proc_flag |= VP8_MFQE;
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    } else if (arg_match(&arg, &pp_debug_info, argi)) {
      unsigned int level = arg_parse_uint(&arg);

      postproc = 1;
      vp8_pp_cfg.post_proc_flag &= ~0x7;

      if (level)
        vp8_pp_cfg.post_proc_flag |= level;
    } else if (arg_match(&arg, &pp_disp_ref_frame, argi)) {
      unsigned int flags = arg_parse_int(&arg);
      if (flags) {
        postproc = 1;
        vp8_dbg_color_ref_frame = flags;
      }
    } else if (arg_match(&arg, &pp_disp_mb_modes, argi)) {
      unsigned int flags = arg_parse_int(&arg);
      if (flags) {
        postproc = 1;
        vp8_dbg_color_mb_modes = flags;
      }
    } else if (arg_match(&arg, &pp_disp_b_modes, argi)) {
      unsigned int flags = arg_parse_int(&arg);
      if (flags) {
        postproc = 1;
        vp8_dbg_color_b_modes = flags;
      }
    } else if (arg_match(&arg, &pp_disp_mvs, argi)) {
      unsigned int flags = arg_parse_int(&arg);
      if (flags) {
        postproc = 1;
        vp8_dbg_display_mv = flags;
      }
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    } else if (arg_match(&arg, &error_concealment, argi)) {
      ec_enabled = 1;
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    }
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#endif
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    else
      argj++;
  }
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  /* Check for unrecognized options */
  for (argi = argv; *argi; argi++)
    if (argi[0][0] == '-' && strlen(argi[0]) > 1)
      die("Error: Unrecognized option %s\n", *argi);
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  /* Handle non-option arguments */
  fn = argv[0];
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  if (!fn)
    usage_exit();
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  /* Open file */
  infile = strcmp(fn, "-") ? fopen(fn, "rb") : set_binary_mode(stdin);
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  if (!infile) {
    fprintf(stderr, "Failed to open file '%s'",
            strcmp(fn, "-") ? fn : "stdin");
    return EXIT_FAILURE;
  }
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#if CONFIG_OS_SUPPORT
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  /* Make sure we don't dump to the terminal, unless forced to with -o - */
  if (!outfile_pattern && isatty(fileno(stdout)) && !do_md5 && !noblit) {
    fprintf(stderr,
            "Not dumping raw video to your terminal. Use '-o -' to "
            "override.\n");
    return EXIT_FAILURE;
  }
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  input.vpx_input_ctx->file = infile;
  if (file_is_ivf(input.vpx_input_ctx))
    input.vpx_input_ctx->file_type = FILE_TYPE_IVF;
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  else if (file_is_webm(input.webm_ctx, input.vpx_input_ctx))
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    input.vpx_input_ctx->file_type = FILE_TYPE_WEBM;
  else if (file_is_raw(input.vpx_input_ctx))
    input.vpx_input_ctx->file_type = FILE_TYPE_RAW;
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  else {
    fprintf(stderr, "Unrecognized input file type.\n");
    return EXIT_FAILURE;
  }

  /* If the output file is not set or doesn't have a sequence number in
   * it, then we only open it once.
   */
  outfile_pattern = outfile_pattern ? outfile_pattern : "-";
  single_file = 1;
  {
    const char *p = outfile_pattern;
    do {
      p = strchr(p, '%');
      if (p && p[1] >= '1' && p[1] <= '9') {
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        /* pattern contains sequence number, so it's not unique. */
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        single_file = 0;
        break;
      }
      if (p)
        p++;
    } while (p);
  }

  if (single_file && !noblit) {
    generate_filename(outfile_pattern, outfile, sizeof(outfile) - 1,
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                      vpx_input_ctx.width, vpx_input_ctx.height, 0);
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    out = out_open(outfile, do_md5);
  }

  if (use_y4m && !noblit) {
    char buffer[128];
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    if (!single_file) {
      fprintf(stderr, "YUV4MPEG2 not supported with output patterns,"
              " try --i420 or --yv12.\n");
      return EXIT_FAILURE;
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    }
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    if (vpx_input_ctx.file_type == FILE_TYPE_WEBM)
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      if (webm_guess_framerate(input.webm_ctx, input.vpx_input_ctx)) {
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        fprintf(stderr, "Failed to guess framerate -- error parsing "
                "webm file?\n");
        return EXIT_FAILURE;
      }
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    /*Note: We can't output an aspect ratio here because IVF doesn't
       store one, and neither does VP8.
      That will have to wait until these tools support WebM natively.*/
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    snprintf(buffer, sizeof(buffer), "YUV4MPEG2 W%u H%u F%u:%u I%c ",
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             vpx_input_ctx.width, vpx_input_ctx.height,
             vpx_input_ctx.framerate.numerator,
             vpx_input_ctx.framerate.denominator,
             'p');
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    out_put(out, (unsigned char *)buffer,
            (unsigned int)strlen(buffer), do_md5);
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  }

  /* Try to determine the codec from the fourcc. */
  for (i = 0; i < sizeof(ifaces) / sizeof(ifaces[0]); i++)
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    if ((vpx_input_ctx.fourcc & ifaces[i].fourcc_mask) == ifaces[i].fourcc) {
      vpx_codec_iface_t *vpx_iface = ifaces[i].iface();
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      if (iface && iface != vpx_iface)
        warn("Header indicates codec: %s\n", ifaces[i].name);
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      else
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        iface = vpx_iface;
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      break;
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    }
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  dec_flags = (postproc ? VPX_CODEC_USE_POSTPROC : 0) |
              (ec_enabled ? VPX_CODEC_USE_ERROR_CONCEALMENT : 0);
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  if (vpx_codec_dec_init(&decoder, iface ? iface :  ifaces[0].iface(), &cfg,
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                         dec_flags)) {
    fprintf(stderr, "Failed to initialize decoder: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }
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  if (!quiet)
    fprintf(stderr, "%s\n", decoder.name);
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#if CONFIG_VP8_DECODER
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  if (vp8_pp_cfg.post_proc_flag
      && vpx_codec_control(&decoder, VP8_SET_POSTPROC, &vp8_pp_cfg)) {
    fprintf(stderr, "Failed to configure postproc: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }

  if (vp8_dbg_color_ref_frame
      && vpx_codec_control(&decoder, VP8_SET_DBG_COLOR_REF_FRAME, vp8_dbg_color_ref_frame)) {
    fprintf(stderr, "Failed to configure reference block visualizer: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }

  if (vp8_dbg_color_mb_modes
      && vpx_codec_control(&decoder, VP8_SET_DBG_COLOR_MB_MODES, vp8_dbg_color_mb_modes)) {
    fprintf(stderr, "Failed to configure macro block visualizer: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }

  if (vp8_dbg_color_b_modes
      && vpx_codec_control(&decoder, VP8_SET_DBG_COLOR_B_MODES, vp8_dbg_color_b_modes)) {
    fprintf(stderr, "Failed to configure block visualizer: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }

  if (vp8_dbg_display_mv
      && vpx_codec_control(&decoder, VP8_SET_DBG_DISPLAY_MV, vp8_dbg_display_mv)) {
    fprintf(stderr, "Failed to configure motion vector visualizer: %s\n", vpx_codec_error(&decoder));
    return EXIT_FAILURE;
  }
#endif
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  if (arg_skip)
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    fprintf(stderr, "Skiping first %d frames.\n", arg_skip);
  while (arg_skip) {
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    if (read_frame(&input, &buf, &bytes_in_buffer, &buffer_size))
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      break;
    arg_skip--;
  }

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  frame_avail = 1;
  got_data = 0;

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  /* Decode file */
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  while (frame_avail || got_data) {
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    vpx_codec_iter_t  iter = NULL;
    vpx_image_t    *img;
    struct vpx_usec_timer timer;
    int                   corrupted;
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    frame_avail = 0;
    if (!stop_after || frame_in < stop_after) {
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      if (!read_frame(&input, &buf, &bytes_in_buffer, &buffer_size)) {
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        frame_avail = 1;
        frame_in++;
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        vpx_usec_timer_start(&timer);
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        if (vpx_codec_decode(&decoder, buf, bytes_in_buffer, NULL, 0)) {
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          const char *detail = vpx_codec_error_detail(&decoder);
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          warn("Failed to decode frame %d: %s",
               frame_in, vpx_codec_error(&decoder));
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          if (detail)
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            warn("Additional information: %s", detail);
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          goto fail;
        }

        vpx_usec_timer_mark(&timer);
        dx_time += (unsigned int)vpx_usec_timer_elapsed(&timer);
      }
    }

    vpx_usec_timer_start(&timer);

    got_data = 0;
    if ((img = vpx_codec_get_frame(&decoder, &iter))) {
      ++frame_out;
      got_data = 1;
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    }

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    vpx_usec_timer_mark(&timer);
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    dx_time += (unsigned int)vpx_usec_timer_elapsed(&timer);
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    if (vpx_codec_control(&decoder, VP8D_GET_FRAME_CORRUPTED, &corrupted)) {
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      warn("Failed VP8_GET_FRAME_CORRUPTED: %s", vpx_codec_error(&decoder));
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      goto fail;
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    }
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    frames_corrupted += corrupted;
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    if (progress)
      show_progress(frame_in, frame_out, dx_time);
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    if (!noblit) {
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      if (frame_out == 1 && img && use_y4m) {
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        /* Write out the color format to terminate the header line */
        const char *color =
            img->fmt == VPX_IMG_FMT_444A ? "C444alpha\n" :
            img->fmt == VPX_IMG_FMT_I444 ? "C444\n" :
            img->fmt == VPX_IMG_FMT_I422 ? "C422\n" :
            "C420jpeg\n";

        out_put(out, (const unsigned char*)color, strlen(color), do_md5);
      }

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      if (do_scale) {
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        int stream_w = 0, stream_h = 0;
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        if (img && frame_out == 1) {
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          int display_size[2];
          if (vpx_codec_control(&decoder, VP9D_GET_DISPLAY_SIZE,
                                display_size)) {
            // Fallback to use raw image size if display size not available.
            stream_w = img->d_w;
            stream_h = img->d_h;
          } else {
            stream_w = display_size[0];
            stream_h = display_size[1];
          }
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          scaled_img = vpx_img_alloc(NULL, VPX_IMG_FMT_I420,
                                     stream_w, stream_h, 16);
        }
        if (img && (img->d_w != stream_w || img->d_h != stream_h)) {
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          assert(img->fmt == VPX_IMG_FMT_I420);
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          I420Scale(img->planes[VPX_PLANE_Y], img->stride[VPX_PLANE_Y],
                    img->planes[VPX_PLANE_U], img->stride[VPX_PLANE_U],
                    img->planes[VPX_PLANE_V], img->stride[VPX_PLANE_V],
                    img->d_w, img->d_h,
                    scaled_img->planes[VPX_PLANE_Y],
                    scaled_img->stride[VPX_PLANE_Y],
                    scaled_img->planes[VPX_PLANE_U],
                    scaled_img->stride[VPX_PLANE_U],
                    scaled_img->planes[VPX_PLANE_V],
                    scaled_img->stride[VPX_PLANE_V],
                    stream_w, stream_h,
                    kFilterBox);
          img = scaled_img;
        }
      }
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      if (img) {
        unsigned int y;
        char out_fn[PATH_MAX];
        uint8_t *buf;
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        unsigned int c_w =
            img->x_chroma_shift ? (1 + img->d_w) >> img->x_chroma_shift
                                : img->d_w;
        unsigned int c_h =
            img->y_chroma_shift ? (1 + img->d_h) >> img->y_chroma_shift
                                : img->d_h;
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        if (!single_file) {
          size_t len = sizeof(out_fn) - 1;
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          out_fn[len] = '\0';
          generate_filename(outfile_pattern, out_fn, len - 1,
                            img->d_w, img->d_h, frame_in);
          out = out_open(out_fn, do_md5);
        } else if (use_y4m)
          out_put(out, (unsigned char *)"FRAME\n", 6, do_md5);

        buf = img->planes[VPX_PLANE_Y];
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        for (y = 0; y < img->d_h; y++) {
          out_put(out, buf, img->d_w, do_md5);
          buf += img->stride[VPX_PLANE_Y];
        }
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        buf = img->planes[flipuv ? VPX_PLANE_V : VPX_PLANE_U];
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        for (y = 0; y < c_h; y++) {
          out_put(out, buf, c_w, do_md5);
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          buf += img->stride[VPX_PLANE_U];
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        }
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        buf = img->planes[flipuv ? VPX_PLANE_U : VPX_PLANE_V];

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        for (y = 0; y < c_h; y++) {
          out_put(out, buf, c_w, do_md5);
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          buf += img->stride[VPX_PLANE_V];
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        }

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        if (!single_file)
          out_close(out, out_fn, do_md5);
      }
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    }

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    if (stop_after && frame_in >= stop_after)
      break;
  }
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  if (summary || progress) {
    show_progress(frame_in, frame_out, dx_time);
    fprintf(stderr, "\n");
  }

  if (frames_corrupted)
    fprintf(stderr, "WARNING: %d frames corrupted.\n", frames_corrupted);
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fail:

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  if (vpx_codec_destroy(&decoder)) {
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    fprintf(stderr, "Failed to destroy decoder: %s\n",
            vpx_codec_error(&decoder));
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    return EXIT_FAILURE;
  }
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  if (single_file && !noblit)
    out_close(out, outfile, do_md5);
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  if (input.vpx_input_ctx->file_type == FILE_TYPE_WEBM)
    webm_free(input.webm_ctx);
  else
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    free(buf);
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  if (scaled_img) vpx_img_free(scaled_img);

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  fclose(infile);
  free(argv);
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  return frames_corrupted ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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int main(int argc, const char **argv_) {
  unsigned int loops = 1, i;
  char **argv, **argi, **argj;
  struct arg arg;
  int error = 0;

  argv = argv_dup(argc - 1, argv_ + 1);
  for (argi = argj = argv; (*argj = *argi); argi += arg.argv_step) {
    memset(&arg, 0, sizeof(arg));
    arg.argv_step = 1;

    if (arg_match(&arg, &looparg, argi)) {
      loops = arg_parse_uint(&arg);
      break;
    }
  }
  free(argv);
  for (i = 0; !error && i < loops; i++)
    error = main_loop(argc, argv_);
  return error;
}