Move aom source to a sub-directory under media/libaom

There is no damned reason to treat this differently than any other media lib given its license and there never was.

1 files changed, 0 insertions, 1142 deletions

diff --git a/third_party/aom/common/y4minput.c b/third_party/aom/common/y4minput.c
deleted file mode 100644
index eca8b1bba..000000000
--- a/third_party/aom/common/y4minput.c
+++ /dev/null
@@ -1,1142 +0,0 @@
-/*
- * Copyright (c) 2016, Alliance for Open Media. All rights reserved
- *
- * This source code is subject to the terms of the BSD 2 Clause License and
- * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
- * was not distributed with this source code in the LICENSE file, you can
- * obtain it at www.aomedia.org/license/software. If the Alliance for Open
- * Media Patent License 1.0 was not distributed with this source code in the
- * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
- *
- * Based on code from the OggTheora software codec source code,
- * Copyright (C) 2002-2010 The Xiph.Org Foundation and contributors.
- */
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "aom/aom_integer.h"
-#include "y4minput.h"
-
-// Reads 'size' bytes from 'file' into 'buf' with some fault tolerance.
-// Returns true on success.
-static int file_read(void *buf, size_t size, FILE *file) {
-  const int kMaxRetries = 5;
-  int retry_count = 0;
-  int file_error;
-  size_t len = 0;
-  do {
-    const size_t n = fread((uint8_t *)buf + len, 1, size - len, file);
-    len += n;
-    file_error = ferror(file);
-    if (file_error) {
-      if (errno == EINTR || errno == EAGAIN) {
-        clearerr(file);
-        continue;
-      } else {
-        fprintf(stderr, "Error reading file: %u of %u bytes read, %d: %s\n",
-                (uint32_t)len, (uint32_t)size, errno, strerror(errno));
-        return 0;
-      }
-    }
-  } while (!feof(file) && len < size && ++retry_count < kMaxRetries);
-
-  if (!feof(file) && len != size) {
-    fprintf(stderr,
-            "Error reading file: %u of %u bytes read,"
-            " error: %d, retries: %d, %d: %s\n",
-            (uint32_t)len, (uint32_t)size, file_error, retry_count, errno,
-            strerror(errno));
-  }
-  return len == size;
-}
-
-static int y4m_parse_tags(y4m_input *_y4m, char *_tags) {
-  int got_w;
-  int got_h;
-  int got_fps;
-  int got_interlace;
-  int got_par;
-  int got_chroma;
-  char *p;
-  char *q;
-  got_w = got_h = got_fps = got_interlace = got_par = got_chroma = 0;
-  for (p = _tags;; p = q) {
-    /*Skip any leading spaces.*/
-    while (*p == ' ') p++;
-    /*If that's all we have, stop.*/
-    if (p[0] == '\0') break;
-    /*Find the end of this tag.*/
-    for (q = p + 1; *q != '\0' && *q != ' '; q++) {
-    }
-    /*Process the tag.*/
-    switch (p[0]) {
-      case 'W': {
-        if (sscanf(p + 1, "%d", &_y4m->pic_w) != 1) return -1;
-        got_w = 1;
-      } break;
-      case 'H': {
-        if (sscanf(p + 1, "%d", &_y4m->pic_h) != 1) return -1;
-        got_h = 1;
-      } break;
-      case 'F': {
-        if (sscanf(p + 1, "%d:%d", &_y4m->fps_n, &_y4m->fps_d) != 2) {
-          return -1;
-        }
-        got_fps = 1;
-      } break;
-      case 'I': {
-        _y4m->interlace = p[1];
-        got_interlace = 1;
-      } break;
-      case 'A': {
-        if (sscanf(p + 1, "%d:%d", &_y4m->par_n, &_y4m->par_d) != 2) {
-          return -1;
-        }
-        got_par = 1;
-      } break;
-      case 'C': {
-        if (q - p > 16) return -1;
-        memcpy(_y4m->chroma_type, p + 1, q - p - 1);
-        _y4m->chroma_type[q - p - 1] = '\0';
-        got_chroma = 1;
-      } break;
-        /*Ignore unknown tags.*/
-    }
-  }
-  if (!got_w || !got_h || !got_fps) return -1;
-  if (!got_interlace) _y4m->interlace = '?';
-  if (!got_par) _y4m->par_n = _y4m->par_d = 0;
-  /*Chroma-type is not specified in older files, e.g., those generated by
-     mplayer.*/
-  if (!got_chroma) strcpy(_y4m->chroma_type, "420");
-  return 0;
-}
-
-/*All anti-aliasing filters in the following conversion functions are based on
-   one of two window functions:
-  The 6-tap Lanczos window (for down-sampling and shifts):
-   sinc(\pi*t)*sinc(\pi*t/3), |t|<3  (sinc(t)==sin(t)/t)
-   0,                         |t|>=3
-  The 4-tap Mitchell window (for up-sampling):
-   7|t|^3-12|t|^2+16/3,             |t|<1
-   -(7/3)|x|^3+12|x|^2-20|x|+32/3,  |t|<2
-   0,                               |t|>=2
-  The number of taps is intentionally kept small to reduce computational
-   overhead and limit ringing.
-
-  The taps from these filters are scaled so that their sum is 1, and the
-  result is scaled by 128 and rounded to integers to create a filter whose
-   intermediate values fit inside 16 bits.
-  Coefficients are rounded in such a way as to ensure their sum is still 128,
-   which is usually equivalent to normal rounding.
-
-  Conversions which require both horizontal and vertical filtering could
-   have these steps pipelined, for less memory consumption and better cache
-   performance, but we do them separately for simplicity.*/
-#define OC_MINI(_a, _b) ((_a) > (_b) ? (_b) : (_a))
-#define OC_MAXI(_a, _b) ((_a) < (_b) ? (_b) : (_a))
-#define OC_CLAMPI(_a, _b, _c) (OC_MAXI(_a, OC_MINI(_b, _c)))
-
-/*420jpeg chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  420mpeg2 chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  BR      |       BR      |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  BR      |       BR      |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  We use a resampling filter to shift the site locations one quarter pixel (at
-   the chroma plane's resolution) to the right.
-  The 4:2:2 modes look exactly the same, except there are twice as many chroma
-   lines, and they are vertically co-sited with the luma samples in both the
-   mpeg2 and jpeg cases (thus requiring no vertical resampling).*/
-static void y4m_42xmpeg2_42xjpeg_helper(unsigned char *_dst,
-                                        const unsigned char *_src, int _c_w,
-                                        int _c_h) {
-  int y;
-  int x;
-  for (y = 0; y < _c_h; y++) {
-    /*Filter: [4 -17 114 35 -9 1]/128, derived from a 6-tap Lanczos
-       window.*/
-    for (x = 0; x < OC_MINI(_c_w, 2); x++) {
-      _dst[x] = (unsigned char)OC_CLAMPI(
-          0,
-          (4 * _src[0] - 17 * _src[OC_MAXI(x - 1, 0)] + 114 * _src[x] +
-           35 * _src[OC_MINI(x + 1, _c_w - 1)] -
-           9 * _src[OC_MINI(x + 2, _c_w - 1)] + _src[OC_MINI(x + 3, _c_w - 1)] +
-           64) >>
-              7,
-          255);
-    }
-    for (; x < _c_w - 3; x++) {
-      _dst[x] = (unsigned char)OC_CLAMPI(
-          0,
-          (4 * _src[x - 2] - 17 * _src[x - 1] + 114 * _src[x] +
-           35 * _src[x + 1] - 9 * _src[x + 2] + _src[x + 3] + 64) >>
-              7,
-          255);
-    }
-    for (; x < _c_w; x++) {
-      _dst[x] = (unsigned char)OC_CLAMPI(
-          0,
-          (4 * _src[x - 2] - 17 * _src[x - 1] + 114 * _src[x] +
-           35 * _src[OC_MINI(x + 1, _c_w - 1)] -
-           9 * _src[OC_MINI(x + 2, _c_w - 1)] + _src[_c_w - 1] + 64) >>
-              7,
-          255);
-    }
-    _dst += _c_w;
-    _src += _c_w;
-  }
-}
-
-/*Handles both 422 and 420mpeg2 to 422jpeg and 420jpeg, respectively.*/
-static void y4m_convert_42xmpeg2_42xjpeg(y4m_input *_y4m, unsigned char *_dst,
-                                         unsigned char *_aux) {
-  int c_w;
-  int c_h;
-  int c_sz;
-  int pli;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  for (pli = 1; pli < 3; pli++) {
-    y4m_42xmpeg2_42xjpeg_helper(_dst, _aux, c_w, c_h);
-    _dst += c_sz;
-    _aux += c_sz;
-  }
-}
-
-/*This format is only used for interlaced content, but is included for
-   completeness.
-
-  420jpeg chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  420paldv chroma samples are sited like:
-  YR------Y-------YR------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YB------Y-------YB------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YR------Y-------YR------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YB------Y-------YB------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  We use a resampling filter to shift the site locations one quarter pixel (at
-   the chroma plane's resolution) to the right.
-  Then we use another filter to move the C_r location down one quarter pixel,
-   and the C_b location up one quarter pixel.*/
-static void y4m_convert_42xpaldv_42xjpeg(y4m_input *_y4m, unsigned char *_dst,
-                                         unsigned char *_aux) {
-  unsigned char *tmp;
-  int c_w;
-  int c_h;
-  int c_sz;
-  int pli;
-  int y;
-  int x;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + 1) / 2;
-  c_h = (_y4m->pic_h + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  c_sz = c_w * c_h;
-  tmp = _aux + 2 * c_sz;
-  for (pli = 1; pli < 3; pli++) {
-    /*First do the horizontal re-sampling.
-      This is the same as the mpeg2 case, except that after the horizontal
-       case, we need to apply a second vertical filter.*/
-    y4m_42xmpeg2_42xjpeg_helper(tmp, _aux, c_w, c_h);
-    _aux += c_sz;
-    switch (pli) {
-      case 1: {
-        /*Slide C_b up a quarter-pel.
-          This is the same filter used above, but in the other order.*/
-        for (x = 0; x < c_w; x++) {
-          for (y = 0; y < OC_MINI(c_h, 3); y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (tmp[0] - 9 * tmp[OC_MAXI(y - 2, 0) * c_w] +
-                 35 * tmp[OC_MAXI(y - 1, 0) * c_w] + 114 * tmp[y * c_w] -
-                 17 * tmp[OC_MINI(y + 1, c_h - 1) * c_w] +
-                 4 * tmp[OC_MINI(y + 2, c_h - 1) * c_w] + 64) >>
-                    7,
-                255);
-          }
-          for (; y < c_h - 2; y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (tmp[(y - 3) * c_w] - 9 * tmp[(y - 2) * c_w] +
-                 35 * tmp[(y - 1) * c_w] + 114 * tmp[y * c_w] -
-                 17 * tmp[(y + 1) * c_w] + 4 * tmp[(y + 2) * c_w] + 64) >>
-                    7,
-                255);
-          }
-          for (; y < c_h; y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (tmp[(y - 3) * c_w] - 9 * tmp[(y - 2) * c_w] +
-                 35 * tmp[(y - 1) * c_w] + 114 * tmp[y * c_w] -
-                 17 * tmp[OC_MINI(y + 1, c_h - 1) * c_w] +
-                 4 * tmp[(c_h - 1) * c_w] + 64) >>
-                    7,
-                255);
-          }
-          _dst++;
-          tmp++;
-        }
-        _dst += c_sz - c_w;
-        tmp -= c_w;
-      } break;
-      case 2: {
-        /*Slide C_r down a quarter-pel.
-          This is the same as the horizontal filter.*/
-        for (x = 0; x < c_w; x++) {
-          for (y = 0; y < OC_MINI(c_h, 2); y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (4 * tmp[0] - 17 * tmp[OC_MAXI(y - 1, 0) * c_w] +
-                 114 * tmp[y * c_w] + 35 * tmp[OC_MINI(y + 1, c_h - 1) * c_w] -
-                 9 * tmp[OC_MINI(y + 2, c_h - 1) * c_w] +
-                 tmp[OC_MINI(y + 3, c_h - 1) * c_w] + 64) >>
-                    7,
-                255);
-          }
-          for (; y < c_h - 3; y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (4 * tmp[(y - 2) * c_w] - 17 * tmp[(y - 1) * c_w] +
-                 114 * tmp[y * c_w] + 35 * tmp[(y + 1) * c_w] -
-                 9 * tmp[(y + 2) * c_w] + tmp[(y + 3) * c_w] + 64) >>
-                    7,
-                255);
-          }
-          for (; y < c_h; y++) {
-            _dst[y * c_w] = (unsigned char)OC_CLAMPI(
-                0,
-                (4 * tmp[(y - 2) * c_w] - 17 * tmp[(y - 1) * c_w] +
-                 114 * tmp[y * c_w] + 35 * tmp[OC_MINI(y + 1, c_h - 1) * c_w] -
-                 9 * tmp[OC_MINI(y + 2, c_h - 1) * c_w] + tmp[(c_h - 1) * c_w] +
-                 64) >>
-                    7,
-                255);
-          }
-          _dst++;
-          tmp++;
-        }
-      } break;
-    }
-    /*For actual interlaced material, this would have to be done separately on
-       each field, and the shift amounts would be different.
-      C_r moves down 1/8, C_b up 3/8 in the top field, and C_r moves down 3/8,
-       C_b up 1/8 in the bottom field.
-      The corresponding filters would be:
-       Down 1/8 (reverse order for up): [3 -11 125 15 -4 0]/128
-       Down 3/8 (reverse order for up): [4 -19 98 56 -13 2]/128*/
-  }
-}
-
-/*Perform vertical filtering to reduce a single plane from 4:2:2 to 4:2:0.
-  This is used as a helper by several conversion routines.*/
-static void y4m_422jpeg_420jpeg_helper(unsigned char *_dst,
-                                       const unsigned char *_src, int _c_w,
-                                       int _c_h) {
-  int y;
-  int x;
-  /*Filter: [3 -17 78 78 -17 3]/128, derived from a 6-tap Lanczos window.*/
-  for (x = 0; x < _c_w; x++) {
-    for (y = 0; y < OC_MINI(_c_h, 2); y += 2) {
-      _dst[(y >> 1) * _c_w] =
-          OC_CLAMPI(0,
-                    (64 * _src[0] + 78 * _src[OC_MINI(1, _c_h - 1) * _c_w] -
-                     17 * _src[OC_MINI(2, _c_h - 1) * _c_w] +
-                     3 * _src[OC_MINI(3, _c_h - 1) * _c_w] + 64) >>
-                        7,
-                    255);
-    }
-    for (; y < _c_h - 3; y += 2) {
-      _dst[(y >> 1) * _c_w] =
-          OC_CLAMPI(0,
-                    (3 * (_src[(y - 2) * _c_w] + _src[(y + 3) * _c_w]) -
-                     17 * (_src[(y - 1) * _c_w] + _src[(y + 2) * _c_w]) +
-                     78 * (_src[y * _c_w] + _src[(y + 1) * _c_w]) + 64) >>
-                        7,
-                    255);
-    }
-    for (; y < _c_h; y += 2) {
-      _dst[(y >> 1) * _c_w] = OC_CLAMPI(
-          0,
-          (3 * (_src[(y - 2) * _c_w] + _src[(_c_h - 1) * _c_w]) -
-           17 * (_src[(y - 1) * _c_w] + _src[OC_MINI(y + 2, _c_h - 1) * _c_w]) +
-           78 * (_src[y * _c_w] + _src[OC_MINI(y + 1, _c_h - 1) * _c_w]) +
-           64) >>
-              7,
-          255);
-    }
-    _src++;
-    _dst++;
-  }
-}
-
-/*420jpeg chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  422jpeg chroma samples are sited like:
-  Y---BR--Y-------Y---BR--Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y---BR--Y-------Y---BR--Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y---BR--Y-------Y---BR--Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y---BR--Y-------Y---BR--Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  We use a resampling filter to decimate the chroma planes by two in the
-   vertical direction.*/
-static void y4m_convert_422jpeg_420jpeg(y4m_input *_y4m, unsigned char *_dst,
-                                        unsigned char *_aux) {
-  int c_w;
-  int c_h;
-  int c_sz;
-  int dst_c_w;
-  int dst_c_h;
-  int dst_c_sz;
-  int pli;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + _y4m->src_c_dec_h - 1) / _y4m->src_c_dec_h;
-  c_h = _y4m->pic_h;
-  dst_c_w = (_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  dst_c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  dst_c_sz = dst_c_w * dst_c_h;
-  for (pli = 1; pli < 3; pli++) {
-    y4m_422jpeg_420jpeg_helper(_dst, _aux, c_w, c_h);
-    _aux += c_sz;
-    _dst += dst_c_sz;
-  }
-}
-
-/*420jpeg chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  422 chroma samples are sited like:
-  YBR-----Y-------YBR-----Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------YBR-----Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------YBR-----Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------YBR-----Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  We use a resampling filter to shift the original site locations one quarter
-   pixel (at the original chroma resolution) to the right.
-  Then we use a second resampling filter to decimate the chroma planes by two
-   in the vertical direction.*/
-static void y4m_convert_422_420jpeg(y4m_input *_y4m, unsigned char *_dst,
-                                    unsigned char *_aux) {
-  unsigned char *tmp;
-  int c_w;
-  int c_h;
-  int c_sz;
-  int dst_c_h;
-  int dst_c_sz;
-  int pli;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + _y4m->src_c_dec_h - 1) / _y4m->src_c_dec_h;
-  c_h = _y4m->pic_h;
-  dst_c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  dst_c_sz = c_w * dst_c_h;
-  tmp = _aux + 2 * c_sz;
-  for (pli = 1; pli < 3; pli++) {
-    /*In reality, the horizontal and vertical steps could be pipelined, for
-       less memory consumption and better cache performance, but we do them
-       separately for simplicity.*/
-    /*First do horizontal filtering (convert to 422jpeg)*/
-    y4m_42xmpeg2_42xjpeg_helper(tmp, _aux, c_w, c_h);
-    /*Now do the vertical filtering.*/
-    y4m_422jpeg_420jpeg_helper(_dst, tmp, c_w, c_h);
-    _aux += c_sz;
-    _dst += dst_c_sz;
-  }
-}
-
-/*420jpeg chroma samples are sited like:
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |   BR  |       |   BR  |
-  |       |       |       |
-  Y-------Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  411 chroma samples are sited like:
-  YBR-----Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-  YBR-----Y-------Y-------Y-------
-  |       |       |       |
-  |       |       |       |
-  |       |       |       |
-
-  We use a filter to resample at site locations one eighth pixel (at the source
-   chroma plane's horizontal resolution) and five eighths of a pixel to the
-   right.
-  Then we use another filter to decimate the planes by 2 in the vertical
-   direction.*/
-static void y4m_convert_411_420jpeg(y4m_input *_y4m, unsigned char *_dst,
-                                    unsigned char *_aux) {
-  unsigned char *tmp;
-  int c_w;
-  int c_h;
-  int c_sz;
-  int dst_c_w;
-  int dst_c_h;
-  int dst_c_sz;
-  int tmp_sz;
-  int pli;
-  int y;
-  int x;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + _y4m->src_c_dec_h - 1) / _y4m->src_c_dec_h;
-  c_h = _y4m->pic_h;
-  dst_c_w = (_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  dst_c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  dst_c_sz = dst_c_w * dst_c_h;
-  tmp_sz = dst_c_w * c_h;
-  tmp = _aux + 2 * c_sz;
-  for (pli = 1; pli < 3; pli++) {
-    /*In reality, the horizontal and vertical steps could be pipelined, for
-       less memory consumption and better cache performance, but we do them
-       separately for simplicity.*/
-    /*First do horizontal filtering (convert to 422jpeg)*/
-    for (y = 0; y < c_h; y++) {
-      /*Filters: [1 110 18 -1]/128 and [-3 50 86 -5]/128, both derived from a
-         4-tap Mitchell window.*/
-      for (x = 0; x < OC_MINI(c_w, 1); x++) {
-        tmp[x << 1] = (unsigned char)OC_CLAMPI(
-            0,
-            (111 * _aux[0] + 18 * _aux[OC_MINI(1, c_w - 1)] -
-             _aux[OC_MINI(2, c_w - 1)] + 64) >>
-                7,
-            255);
-        tmp[x << 1 | 1] = (unsigned char)OC_CLAMPI(
-            0,
-            (47 * _aux[0] + 86 * _aux[OC_MINI(1, c_w - 1)] -
-             5 * _aux[OC_MINI(2, c_w - 1)] + 64) >>
-                7,
-            255);
-      }
-      for (; x < c_w - 2; x++) {
-        tmp[x << 1] =
-            (unsigned char)OC_CLAMPI(0,
-                                     (_aux[x - 1] + 110 * _aux[x] +
-                                      18 * _aux[x + 1] - _aux[x + 2] + 64) >>
-                                         7,
-                                     255);
-        tmp[x << 1 | 1] = (unsigned char)OC_CLAMPI(
-            0,
-            (-3 * _aux[x - 1] + 50 * _aux[x] + 86 * _aux[x + 1] -
-             5 * _aux[x + 2] + 64) >>
-                7,
-            255);
-      }
-      for (; x < c_w; x++) {
-        tmp[x << 1] = (unsigned char)OC_CLAMPI(
-            0,
-            (_aux[x - 1] + 110 * _aux[x] + 18 * _aux[OC_MINI(x + 1, c_w - 1)] -
-             _aux[c_w - 1] + 64) >>
-                7,
-            255);
-        if ((x << 1 | 1) < dst_c_w) {
-          tmp[x << 1 | 1] = (unsigned char)OC_CLAMPI(
-              0,
-              (-3 * _aux[x - 1] + 50 * _aux[x] +
-               86 * _aux[OC_MINI(x + 1, c_w - 1)] - 5 * _aux[c_w - 1] + 64) >>
-                  7,
-              255);
-        }
-      }
-      tmp += dst_c_w;
-      _aux += c_w;
-    }
-    tmp -= tmp_sz;
-    /*Now do the vertical filtering.*/
-    y4m_422jpeg_420jpeg_helper(_dst, tmp, dst_c_w, c_h);
-    _dst += dst_c_sz;
-  }
-}
-
-/*Convert 444 to 420jpeg.*/
-static void y4m_convert_444_420jpeg(y4m_input *_y4m, unsigned char *_dst,
-                                    unsigned char *_aux) {
-  unsigned char *tmp;
-  int c_w;
-  int c_h;
-  int c_sz;
-  int dst_c_w;
-  int dst_c_h;
-  int dst_c_sz;
-  int tmp_sz;
-  int pli;
-  int y;
-  int x;
-  /*Skip past the luma data.*/
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  /*Compute the size of each chroma plane.*/
-  c_w = (_y4m->pic_w + _y4m->src_c_dec_h - 1) / _y4m->src_c_dec_h;
-  c_h = _y4m->pic_h;
-  dst_c_w = (_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  dst_c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  dst_c_sz = dst_c_w * dst_c_h;
-  tmp_sz = dst_c_w * c_h;
-  tmp = _aux + 2 * c_sz;
-  for (pli = 1; pli < 3; pli++) {
-    /*Filter: [3 -17 78 78 -17 3]/128, derived from a 6-tap Lanczos window.*/
-    for (y = 0; y < c_h; y++) {
-      for (x = 0; x < OC_MINI(c_w, 2); x += 2) {
-        tmp[x >> 1] = OC_CLAMPI(0,
-                                (64 * _aux[0] + 78 * _aux[OC_MINI(1, c_w - 1)] -
-                                 17 * _aux[OC_MINI(2, c_w - 1)] +
-                                 3 * _aux[OC_MINI(3, c_w - 1)] + 64) >>
-                                    7,
-                                255);
-      }
-      for (; x < c_w - 3; x += 2) {
-        tmp[x >> 1] = OC_CLAMPI(0,
-                                (3 * (_aux[x - 2] + _aux[x + 3]) -
-                                 17 * (_aux[x - 1] + _aux[x + 2]) +
-                                 78 * (_aux[x] + _aux[x + 1]) + 64) >>
-                                    7,
-                                255);
-      }
-      for (; x < c_w; x += 2) {
-        tmp[x >> 1] =
-            OC_CLAMPI(0,
-                      (3 * (_aux[x - 2] + _aux[c_w - 1]) -
-                       17 * (_aux[x - 1] + _aux[OC_MINI(x + 2, c_w - 1)]) +
-                       78 * (_aux[x] + _aux[OC_MINI(x + 1, c_w - 1)]) + 64) >>
-                          7,
-                      255);
-      }
-      tmp += dst_c_w;
-      _aux += c_w;
-    }
-    tmp -= tmp_sz;
-    /*Now do the vertical filtering.*/
-    y4m_422jpeg_420jpeg_helper(_dst, tmp, dst_c_w, c_h);
-    _dst += dst_c_sz;
-  }
-}
-
-/*The image is padded with empty chroma components at 4:2:0.*/
-static void y4m_convert_mono_420jpeg(y4m_input *_y4m, unsigned char *_dst,
-                                     unsigned char *_aux) {
-  int c_sz;
-  (void)_aux;
-  _dst += _y4m->pic_w * _y4m->pic_h;
-  c_sz = ((_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h) *
-         ((_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v);
-  memset(_dst, 128, c_sz * 2);
-}
-
-/*No conversion function needed.*/
-static void y4m_convert_null(y4m_input *_y4m, unsigned char *_dst,
-                             unsigned char *_aux) {
-  (void)_y4m;
-  (void)_dst;
-  (void)_aux;
-}
-
-int y4m_input_open(y4m_input *_y4m, FILE *_fin, char *_skip, int _nskip,
-                   int only_420) {
-  char buffer[80] = { 0 };
-  int ret;
-  int i;
-  /*Read until newline, or 80 cols, whichever happens first.*/
-  for (i = 0; i < 79; i++) {
-    if (_nskip > 0) {
-      buffer[i] = *_skip++;
-      _nskip--;
-    } else {
-      if (!file_read(buffer + i, 1, _fin)) return -1;
-    }
-    if (buffer[i] == '\n') break;
-  }
-  /*We skipped too much header data.*/
-  if (_nskip > 0) return -1;
-  if (i == 79) {
-    fprintf(stderr, "Error parsing header; not a YUV2MPEG2 file?\n");
-    return -1;
-  }
-  buffer[i] = '\0';
-  if (memcmp(buffer, "YUV4MPEG", 8)) {
-    fprintf(stderr, "Incomplete magic for YUV4MPEG file.\n");
-    return -1;
-  }
-  if (buffer[8] != '2') {
-    fprintf(stderr, "Incorrect YUV input file version; YUV4MPEG2 required.\n");
-  }
-  ret = y4m_parse_tags(_y4m, buffer + 5);
-  if (ret < 0) {
-    fprintf(stderr, "Error parsing YUV4MPEG2 header.\n");
-    return ret;
-  }
-  if (_y4m->interlace == '?') {
-    fprintf(stderr,
-            "Warning: Input video interlacing format unknown; "
-            "assuming progressive scan.\n");
-  } else if (_y4m->interlace != 'p') {
-    fprintf(stderr,
-            "Input video is interlaced; "
-            "Only progressive scan handled.\n");
-    return -1;
-  }
-  _y4m->aom_fmt = AOM_IMG_FMT_I420;
-  _y4m->bps = 12;
-  _y4m->bit_depth = 8;
-  if (strcmp(_y4m->chroma_type, "420") == 0 ||
-      strcmp(_y4m->chroma_type, "420jpeg") == 0) {
-    _y4m->src_c_dec_h = _y4m->dst_c_dec_h = _y4m->src_c_dec_v =
-        _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz =
-        _y4m->pic_w * _y4m->pic_h +
-        2 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2);
-    /* Natively supported: no conversion required. */
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-  } else if (strcmp(_y4m->chroma_type, "420p10") == 0) {
-    _y4m->src_c_dec_h = 2;
-    _y4m->dst_c_dec_h = 2;
-    _y4m->src_c_dec_v = 2;
-    _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz =
-        2 * (_y4m->pic_w * _y4m->pic_h +
-             2 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2));
-    /* Natively supported: no conversion required. */
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    _y4m->bit_depth = 10;
-    _y4m->bps = 15;
-    _y4m->aom_fmt = AOM_IMG_FMT_I42016;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 420p10 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "420p12") == 0) {
-    _y4m->src_c_dec_h = 2;
-    _y4m->dst_c_dec_h = 2;
-    _y4m->src_c_dec_v = 2;
-    _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz =
-        2 * (_y4m->pic_w * _y4m->pic_h +
-             2 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2));
-    /* Natively supported: no conversion required. */
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    _y4m->bit_depth = 12;
-    _y4m->bps = 18;
-    _y4m->aom_fmt = AOM_IMG_FMT_I42016;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 420p12 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "420mpeg2") == 0) {
-    _y4m->src_c_dec_h = _y4m->dst_c_dec_h = _y4m->src_c_dec_v =
-        _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-    /*Chroma filter required: read into the aux buf first.*/
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz =
-        2 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2);
-    _y4m->convert = y4m_convert_42xmpeg2_42xjpeg;
-  } else if (strcmp(_y4m->chroma_type, "420paldv") == 0) {
-    _y4m->src_c_dec_h = _y4m->dst_c_dec_h = _y4m->src_c_dec_v =
-        _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-    /*Chroma filter required: read into the aux buf first.
-      We need to make two filter passes, so we need some extra space in the
-       aux buffer.*/
-    _y4m->aux_buf_sz = 3 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2);
-    _y4m->aux_buf_read_sz =
-        2 * ((_y4m->pic_w + 1) / 2) * ((_y4m->pic_h + 1) / 2);
-    _y4m->convert = y4m_convert_42xpaldv_42xjpeg;
-  } else if (strcmp(_y4m->chroma_type, "422jpeg") == 0) {
-    _y4m->src_c_dec_h = _y4m->dst_c_dec_h = 2;
-    _y4m->src_c_dec_v = 1;
-    _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-    /*Chroma filter required: read into the aux buf first.*/
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz =
-        2 * ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-    _y4m->convert = y4m_convert_422jpeg_420jpeg;
-  } else if (strcmp(_y4m->chroma_type, "422") == 0) {
-    _y4m->src_c_dec_h = 2;
-    _y4m->src_c_dec_v = 1;
-    if (only_420) {
-      _y4m->dst_c_dec_h = 2;
-      _y4m->dst_c_dec_v = 2;
-      _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-      /*Chroma filter required: read into the aux buf first.
-        We need to make two filter passes, so we need some extra space in the
-         aux buffer.*/
-      _y4m->aux_buf_read_sz = 2 * ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-      _y4m->aux_buf_sz =
-          _y4m->aux_buf_read_sz + ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-      _y4m->convert = y4m_convert_422_420jpeg;
-    } else {
-      _y4m->aom_fmt = AOM_IMG_FMT_I422;
-      _y4m->bps = 16;
-      _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-      _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-      _y4m->dst_buf_read_sz =
-          _y4m->pic_w * _y4m->pic_h + 2 * ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-      /*Natively supported: no conversion required.*/
-      _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-      _y4m->convert = y4m_convert_null;
-    }
-  } else if (strcmp(_y4m->chroma_type, "422p10") == 0) {
-    _y4m->src_c_dec_h = 2;
-    _y4m->src_c_dec_v = 1;
-    _y4m->aom_fmt = AOM_IMG_FMT_I42216;
-    _y4m->bps = 20;
-    _y4m->bit_depth = 10;
-    _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-    _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-    _y4m->dst_buf_read_sz = 2 * (_y4m->pic_w * _y4m->pic_h +
-                                 2 * ((_y4m->pic_w + 1) / 2) * _y4m->pic_h);
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 422p10 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "422p12") == 0) {
-    _y4m->src_c_dec_h = 2;
-    _y4m->src_c_dec_v = 1;
-    _y4m->aom_fmt = AOM_IMG_FMT_I42216;
-    _y4m->bps = 24;
-    _y4m->bit_depth = 12;
-    _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-    _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-    _y4m->dst_buf_read_sz = 2 * (_y4m->pic_w * _y4m->pic_h +
-                                 2 * ((_y4m->pic_w + 1) / 2) * _y4m->pic_h);
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 422p12 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "411") == 0) {
-    _y4m->src_c_dec_h = 4;
-    _y4m->dst_c_dec_h = 2;
-    _y4m->src_c_dec_v = 1;
-    _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-    /*Chroma filter required: read into the aux buf first.
-      We need to make two filter passes, so we need some extra space in the
-       aux buffer.*/
-    _y4m->aux_buf_read_sz = 2 * ((_y4m->pic_w + 3) / 4) * _y4m->pic_h;
-    _y4m->aux_buf_sz =
-        _y4m->aux_buf_read_sz + ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-    _y4m->convert = y4m_convert_411_420jpeg;
-  } else if (strcmp(_y4m->chroma_type, "444") == 0) {
-    _y4m->src_c_dec_h = 1;
-    _y4m->src_c_dec_v = 1;
-    if (only_420) {
-      _y4m->dst_c_dec_h = 2;
-      _y4m->dst_c_dec_v = 2;
-      _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-      /*Chroma filter required: read into the aux buf first.
-        We need to make two filter passes, so we need some extra space in the
-         aux buffer.*/
-      _y4m->aux_buf_read_sz = 2 * _y4m->pic_w * _y4m->pic_h;
-      _y4m->aux_buf_sz =
-          _y4m->aux_buf_read_sz + ((_y4m->pic_w + 1) / 2) * _y4m->pic_h;
-      _y4m->convert = y4m_convert_444_420jpeg;
-    } else {
-      _y4m->aom_fmt = AOM_IMG_FMT_I444;
-      _y4m->bps = 24;
-      _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-      _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-      _y4m->dst_buf_read_sz = 3 * _y4m->pic_w * _y4m->pic_h;
-      /*Natively supported: no conversion required.*/
-      _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-      _y4m->convert = y4m_convert_null;
-    }
-  } else if (strcmp(_y4m->chroma_type, "444p10") == 0) {
-    _y4m->src_c_dec_h = 1;
-    _y4m->src_c_dec_v = 1;
-    _y4m->aom_fmt = AOM_IMG_FMT_I44416;
-    _y4m->bps = 30;
-    _y4m->bit_depth = 10;
-    _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-    _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-    _y4m->dst_buf_read_sz = 2 * 3 * _y4m->pic_w * _y4m->pic_h;
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 444p10 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "444p12") == 0) {
-    _y4m->src_c_dec_h = 1;
-    _y4m->src_c_dec_v = 1;
-    _y4m->aom_fmt = AOM_IMG_FMT_I44416;
-    _y4m->bps = 36;
-    _y4m->bit_depth = 12;
-    _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-    _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-    _y4m->dst_buf_read_sz = 2 * 3 * _y4m->pic_w * _y4m->pic_h;
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_null;
-    if (only_420) {
-      fprintf(stderr, "Unsupported conversion from 444p12 to 420jpeg\n");
-      return -1;
-    }
-  } else if (strcmp(_y4m->chroma_type, "444alpha") == 0) {
-    _y4m->src_c_dec_h = 1;
-    _y4m->src_c_dec_v = 1;
-    if (only_420) {
-      _y4m->dst_c_dec_h = 2;
-      _y4m->dst_c_dec_v = 2;
-      _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-      /*Chroma filter required: read into the aux buf first.
-        We need to make two filter passes, so we need some extra space in the
-         aux buffer.
-        The extra plane also gets read into the aux buf.
-        It will be discarded.*/
-      _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 3 * _y4m->pic_w * _y4m->pic_h;
-      _y4m->convert = y4m_convert_444_420jpeg;
-    } else {
-      _y4m->aom_fmt = AOM_IMG_FMT_444A;
-      _y4m->bps = 32;
-      _y4m->dst_c_dec_h = _y4m->src_c_dec_h;
-      _y4m->dst_c_dec_v = _y4m->src_c_dec_v;
-      _y4m->dst_buf_read_sz = 4 * _y4m->pic_w * _y4m->pic_h;
-      /*Natively supported: no conversion required.*/
-      _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-      _y4m->convert = y4m_convert_null;
-    }
-  } else if (strcmp(_y4m->chroma_type, "mono") == 0) {
-    _y4m->src_c_dec_h = _y4m->src_c_dec_v = 0;
-    _y4m->dst_c_dec_h = _y4m->dst_c_dec_v = 2;
-    _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
-    /*No extra space required, but we need to clear the chroma planes.*/
-    _y4m->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
-    _y4m->convert = y4m_convert_mono_420jpeg;
-  } else {
-    fprintf(stderr, "Unknown chroma sampling type: %s\n", _y4m->chroma_type);
-    return -1;
-  }
-  /*The size of the final frame buffers is always computed from the
-     destination chroma decimation type.*/
-  _y4m->dst_buf_sz =
-      _y4m->pic_w * _y4m->pic_h +
-      2 * ((_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h) *
-          ((_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v);
-  if (_y4m->bit_depth == 8)
-    _y4m->dst_buf = (unsigned char *)malloc(_y4m->dst_buf_sz);
-  else
-    _y4m->dst_buf = (unsigned char *)malloc(2 * _y4m->dst_buf_sz);
-
-  if (_y4m->aux_buf_sz > 0)
-    _y4m->aux_buf = (unsigned char *)malloc(_y4m->aux_buf_sz);
-  return 0;
-}
-
-void y4m_input_close(y4m_input *_y4m) {
-  free(_y4m->dst_buf);
-  free(_y4m->aux_buf);
-}
-
-int y4m_input_fetch_frame(y4m_input *_y4m, FILE *_fin, aom_image_t *_img) {
-  char frame[6];
-  int pic_sz;
-  int c_w;
-  int c_h;
-  int c_sz;
-  int bytes_per_sample = _y4m->bit_depth > 8 ? 2 : 1;
-  /*Read and skip the frame header.*/
-  if (!file_read(frame, 6, _fin)) return 0;
-  if (memcmp(frame, "FRAME", 5)) {
-    fprintf(stderr, "Loss of framing in Y4M input data\n");
-    return -1;
-  }
-  if (frame[5] != '\n') {
-    char c;
-    int j;
-    for (j = 0; j < 79 && file_read(&c, 1, _fin) && c != '\n'; j++) {
-    }
-    if (j == 79) {
-      fprintf(stderr, "Error parsing Y4M frame header\n");
-      return -1;
-    }
-  }
-  /*Read the frame data that needs no conversion.*/
-  if (!file_read(_y4m->dst_buf, _y4m->dst_buf_read_sz, _fin)) {
-    fprintf(stderr, "Error reading Y4M frame data.\n");
-    return -1;
-  }
-  /*Read the frame data that does need conversion.*/
-  if (!file_read(_y4m->aux_buf, _y4m->aux_buf_read_sz, _fin)) {
-    fprintf(stderr, "Error reading Y4M frame data.\n");
-    return -1;
-  }
-  /*Now convert the just read frame.*/
-  (*_y4m->convert)(_y4m, _y4m->dst_buf, _y4m->aux_buf);
-  /*Fill in the frame buffer pointers.
-    We don't use aom_img_wrap() because it forces padding for odd picture
-     sizes, which would require a separate fread call for every row.*/
-  memset(_img, 0, sizeof(*_img));
-  /*Y4M has the planes in Y'CbCr order, which libaom calls Y, U, and V.*/
-  _img->fmt = _y4m->aom_fmt;
-  _img->w = _img->d_w = _y4m->pic_w;
-  _img->h = _img->d_h = _y4m->pic_h;
-  _img->x_chroma_shift = _y4m->dst_c_dec_h >> 1;
-  _img->y_chroma_shift = _y4m->dst_c_dec_v >> 1;
-  _img->bps = _y4m->bps;
-
-  /*Set up the buffer pointers.*/
-  pic_sz = _y4m->pic_w * _y4m->pic_h * bytes_per_sample;
-  c_w = (_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h;
-  c_w *= bytes_per_sample;
-  c_h = (_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v;
-  c_sz = c_w * c_h;
-  _img->stride[AOM_PLANE_Y] = _img->stride[AOM_PLANE_ALPHA] =
-      _y4m->pic_w * bytes_per_sample;
-  _img->stride[AOM_PLANE_U] = _img->stride[AOM_PLANE_V] = c_w;
-  _img->planes[AOM_PLANE_Y] = _y4m->dst_buf;
-  _img->planes[AOM_PLANE_U] = _y4m->dst_buf + pic_sz;
-  _img->planes[AOM_PLANE_V] = _y4m->dst_buf + pic_sz + c_sz;
-  _img->planes[AOM_PLANE_ALPHA] = _y4m->dst_buf + pic_sz + 2 * c_sz;
-  return 1;
-}