diff options
Diffstat (limited to 'third_party/aom/common/y4minput.c')
| -rw-r--r-- | third_party/aom/common/y4minput.c | 1222 |
1 files changed, 1222 insertions, 0 deletions
diff --git a/third_party/aom/common/y4minput.c b/third_party/aom/common/y4minput.c new file mode 100644 index 0000000000..1974d76f1f --- /dev/null +++ b/third_party/aom/common/y4minput.c @@ -0,0 +1,1222 @@ +/* + * 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 <assert.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +#include "aom/aom_integer.h" +#include "aom_ports/msvc.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 kMaxTries = 5; + int try_count = 0; + int file_error = 0; + size_t len = 0; + while (!feof(file) && len < size && try_count < kMaxTries) { + const size_t n = fread((uint8_t *)buf + len, 1, size - len, file); + ++try_count; + 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; + } + } + } + + if (!feof(file) && len != size) { + fprintf(stderr, + "Error reading file: %u of %u bytes read," + " error: %d, tries: %d, %d: %s\n", + (uint32_t)len, (uint32_t)size, file_error, try_count, errno, + strerror(errno)); + } + return len == size; +} + +// Stores the color range in 'y4m_ctx', returning 1 if successfully parsed, +// 0 otherwise. +static int parse_color_range(y4m_input *y4m_ctx, const char *buf) { + // Note that default is studio range. + if (strcmp(buf, "LIMITED") == 0) { + return 1; + } + if (strcmp(buf, "FULL") == 0) { + y4m_ctx->color_range = AOM_CR_FULL_RANGE; + return 1; + } + fprintf(stderr, "Unknown color range value: %s\n", buf); + return 0; +} + +static int parse_metadata(y4m_input *y4m_ctx, const char *buf) { + if (strncmp(buf, "COLORRANGE=", 11) == 0) { + return parse_color_range(y4m_ctx, buf + 11); + } + return 1; // No support for other metadata, just ignore them. +} + +static int y4m_parse_tags(y4m_input *_y4m, char *_tags) { + char *p; + char *q; + 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; + } break; + case 'H': { + if (sscanf(p + 1, "%d", &_y4m->pic_h) != 1) return -1; + } break; + case 'F': { + if (sscanf(p + 1, "%d:%d", &_y4m->fps_n, &_y4m->fps_d) != 2) { + return -1; + } + } break; + case 'I': { + _y4m->interlace = p[1]; + } break; + case 'A': { + if (sscanf(p + 1, "%d:%d", &_y4m->par_n, &_y4m->par_d) != 2) { + return -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'; + } break; + case 'X': { + if (!parse_metadata(_y4m, p + 1)) return -1; + } break; + default: break; /*Ignore unknown tags.*/ + } + } + return 0; +} + +// Copy a single tag into the buffer, along with a null character. +// Returns 0 if any file IO errors occur. +static int copy_tag(char *buf, size_t buf_len, char *end_tag, FILE *file) { + size_t i; + assert(buf_len >= 1); + // Skip leading space characters. + do { + if (!file_read(buf, 1, file)) { + return 0; + } + } while (buf[0] == ' '); + + // If we hit the newline, treat this as the "empty" tag. + if (buf[0] == '\n') { + buf[0] = '\0'; + *end_tag = '\n'; + return 1; + } + + // Copy over characters until a space is hit, or the buffer is exhausted. + for (i = 1; i < buf_len; ++i) { + if (!file_read(buf + i, 1, file)) { + return 0; + } + if (buf[i] == ' ' || buf[i] == '\n') { + break; + } + } + if (i == buf_len) { + fprintf(stderr, "Error: Y4M header tags must be less than %lu characters\n", + (unsigned long)i); + return 0; + } + *end_tag = buf[i]; + buf[i] = '\0'; + return 1; +} + +// Returns 1 if tags were parsed successfully, 0 otherwise. +static int parse_tags(y4m_input *y4m_ctx, FILE *file) { + char tag[256]; + char end; // Character denoting the end of the tag, ' ' or '\n'. + // Set Y4M tags to defaults, updating them as processing occurs. Mandatory + // fields are marked with -1 and will be checked after the tags are parsed. + y4m_ctx->pic_w = -1; + y4m_ctx->pic_h = -1; + y4m_ctx->fps_n = -1; // Also serves as marker for fps_d + y4m_ctx->par_n = 0; + y4m_ctx->par_d = 0; + y4m_ctx->interlace = '?'; + y4m_ctx->color_range = AOM_CR_STUDIO_RANGE; + snprintf(y4m_ctx->chroma_type, sizeof(y4m_ctx->chroma_type), "420"); + + // Find one tag at a time. + do { + if (!copy_tag(tag, sizeof(tag), &end, file)) { + return 0; + } + // y4m_parse_tags returns 0 on success. + if (y4m_parse_tags(y4m_ctx, tag)) { + return 0; + } + } while (end != '\n'); + + // Check the mandatory fields. + if (y4m_ctx->pic_w == -1) { + fprintf(stderr, "Width field missing\n"); + return 0; + } + if (y4m_ctx->pic_h == -1) { + fprintf(stderr, "Height field missing\n"); + return 0; + } + if (y4m_ctx->fps_n == -1) { + fprintf(stderr, "FPS field missing\n"); + return 0; + } + return 1; +} + +/*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; + } +} + +/*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; +} + +static const char TAG[] = "YUV4MPEG2"; + +int y4m_input_open(y4m_input *y4m_ctx, FILE *file, char *skip_buffer, + int num_skip, aom_chroma_sample_position_t csp, + int only_420) { + // File must start with |TAG|. + char tag_buffer[9]; // 9 == strlen(TAG) + // Read as much as possible from |skip_buffer|, which were characters + // that were previously read from the file to do input-type detection. + assert(num_skip >= 0 && num_skip <= 8); + if (num_skip > 0) { + memcpy(tag_buffer, skip_buffer, num_skip); + } + // Start reading from the file now that the |skip_buffer| is depleted. + if (!file_read(tag_buffer + num_skip, 9 - num_skip, file)) { + return -1; + } + if (memcmp(TAG, tag_buffer, 9) != 0) { + fprintf(stderr, "Error parsing header: must start with %s\n", TAG); + return -1; + } + // Next character must be a space. + if (!file_read(tag_buffer, 1, file) || tag_buffer[0] != ' ') { + fprintf(stderr, "Error parsing header: space must follow %s\n", TAG); + return -1; + } + if (!parse_tags(y4m_ctx, file)) { + fprintf(stderr, "Error parsing %s header.\n", TAG); + return -1; + } + if (y4m_ctx->interlace == '?') { + fprintf(stderr, + "Warning: Input video interlacing format unknown; " + "assuming progressive scan.\n"); + } else if (y4m_ctx->interlace != 'p') { + fprintf(stderr, + "Input video is interlaced; " + "Only progressive scan handled.\n"); + return -1; + } + /* Only support vertical chroma sample position if the input format is + * already 420mpeg2. Colocated is not supported in Y4M. + */ + if (csp == AOM_CSP_VERTICAL && + strcmp(y4m_ctx->chroma_type, "420mpeg2") != 0) { + fprintf(stderr, + "Vertical chroma sample position only supported " + "for 420mpeg2 input\n"); + return -1; + } + if (csp == AOM_CSP_COLOCATED) { + // TODO(any): check the right way to handle this in y4m + fprintf(stderr, + "Ignoring colocated chroma sample position for reading in Y4M\n"); + } + y4m_ctx->aom_fmt = AOM_IMG_FMT_I420; + y4m_ctx->bps = 12; + y4m_ctx->bit_depth = 8; + y4m_ctx->aux_buf = NULL; + y4m_ctx->dst_buf = NULL; + if (strcmp(y4m_ctx->chroma_type, "420") == 0 || + strcmp(y4m_ctx->chroma_type, "420jpeg") == 0 || + strcmp(y4m_ctx->chroma_type, "420mpeg2") == 0) { + y4m_ctx->src_c_dec_h = y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_v = + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = + y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * ((y4m_ctx->pic_h + 1) / 2); + /* Natively supported: no conversion required. */ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + } else if (strcmp(y4m_ctx->chroma_type, "420p10") == 0) { + y4m_ctx->src_c_dec_h = 2; + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 2; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = + 2 * (y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * ((y4m_ctx->pic_h + 1) / 2)); + /* Natively supported: no conversion required. */ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + y4m_ctx->bit_depth = 10; + y4m_ctx->bps = 15; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I42016; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 420p10 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "420p12") == 0) { + y4m_ctx->src_c_dec_h = 2; + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 2; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = + 2 * (y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * ((y4m_ctx->pic_h + 1) / 2)); + /* Natively supported: no conversion required. */ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + y4m_ctx->bit_depth = 12; + y4m_ctx->bps = 18; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I42016; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 420p12 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "420paldv") == 0) { + y4m_ctx->src_c_dec_h = y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_v = + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->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_ctx->aux_buf_sz = + 3 * ((y4m_ctx->pic_w + 1) / 2) * ((y4m_ctx->pic_h + 1) / 2); + y4m_ctx->aux_buf_read_sz = + 2 * ((y4m_ctx->pic_w + 1) / 2) * ((y4m_ctx->pic_h + 1) / 2); + y4m_ctx->convert = y4m_convert_42xpaldv_42xjpeg; + } else if (strcmp(y4m_ctx->chroma_type, "422jpeg") == 0) { + y4m_ctx->src_c_dec_h = y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->pic_h; + /*Chroma filter required: read into the aux buf first.*/ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = + 2 * ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + y4m_ctx->convert = y4m_convert_422jpeg_420jpeg; + } else if (strcmp(y4m_ctx->chroma_type, "422") == 0) { + y4m_ctx->src_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 1; + if (only_420) { + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->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_ctx->aux_buf_read_sz = + 2 * ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz + + ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + y4m_ctx->convert = y4m_convert_422_420jpeg; + } else { + y4m_ctx->aom_fmt = AOM_IMG_FMT_I422; + y4m_ctx->bps = 16; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = + y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + /*Natively supported: no conversion required.*/ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + } + } else if (strcmp(y4m_ctx->chroma_type, "422p10") == 0) { + y4m_ctx->src_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I42216; + y4m_ctx->bps = 20; + y4m_ctx->bit_depth = 10; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = + 2 * (y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h); + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 422p10 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "422p12") == 0) { + y4m_ctx->src_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I42216; + y4m_ctx->bps = 24; + y4m_ctx->bit_depth = 12; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = + 2 * (y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h); + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 422p12 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "411") == 0) { + y4m_ctx->src_c_dec_h = 4; + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->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_ctx->aux_buf_read_sz = 2 * ((y4m_ctx->pic_w + 3) / 4) * y4m_ctx->pic_h; + y4m_ctx->aux_buf_sz = + y4m_ctx->aux_buf_read_sz + ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + y4m_ctx->convert = y4m_convert_411_420jpeg; + } else if (strcmp(y4m_ctx->chroma_type, "444") == 0) { + y4m_ctx->src_c_dec_h = 1; + y4m_ctx->src_c_dec_v = 1; + if (only_420) { + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->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_ctx->aux_buf_read_sz = 2 * y4m_ctx->pic_w * y4m_ctx->pic_h; + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz + + ((y4m_ctx->pic_w + 1) / 2) * y4m_ctx->pic_h; + y4m_ctx->convert = y4m_convert_444_420jpeg; + } else { + y4m_ctx->aom_fmt = AOM_IMG_FMT_I444; + y4m_ctx->bps = 24; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = 3 * y4m_ctx->pic_w * y4m_ctx->pic_h; + /*Natively supported: no conversion required.*/ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + } + } else if (strcmp(y4m_ctx->chroma_type, "444p10") == 0) { + y4m_ctx->src_c_dec_h = 1; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I44416; + y4m_ctx->bps = 30; + y4m_ctx->bit_depth = 10; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = 2 * 3 * y4m_ctx->pic_w * y4m_ctx->pic_h; + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 444p10 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "444p12") == 0) { + y4m_ctx->src_c_dec_h = 1; + y4m_ctx->src_c_dec_v = 1; + y4m_ctx->aom_fmt = AOM_IMG_FMT_I44416; + y4m_ctx->bps = 36; + y4m_ctx->bit_depth = 12; + y4m_ctx->dst_c_dec_h = y4m_ctx->src_c_dec_h; + y4m_ctx->dst_c_dec_v = y4m_ctx->src_c_dec_v; + y4m_ctx->dst_buf_read_sz = 2 * 3 * y4m_ctx->pic_w * y4m_ctx->pic_h; + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_null; + if (only_420) { + fprintf(stderr, "Unsupported conversion from 444p12 to 420jpeg\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "444alpha") == 0) { + y4m_ctx->src_c_dec_h = 1; + y4m_ctx->src_c_dec_v = 1; + if (only_420) { + y4m_ctx->dst_c_dec_h = 2; + y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->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_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = + 3 * y4m_ctx->pic_w * y4m_ctx->pic_h; + y4m_ctx->convert = y4m_convert_444_420jpeg; + } else { + fprintf(stderr, "Unsupported format: 444A\n"); + return -1; + } + } else if (strcmp(y4m_ctx->chroma_type, "mono") == 0) { + y4m_ctx->src_c_dec_h = y4m_ctx->src_c_dec_v = 0; + y4m_ctx->dst_c_dec_h = y4m_ctx->dst_c_dec_v = 2; + y4m_ctx->dst_buf_read_sz = y4m_ctx->pic_w * y4m_ctx->pic_h; + /*No extra space required, but we need to clear the chroma planes.*/ + y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0; + y4m_ctx->convert = y4m_convert_mono_420jpeg; + } else { + fprintf(stderr, "Unknown chroma sampling type: %s\n", y4m_ctx->chroma_type); + return -1; + } + /*The size of the final frame buffers is always computed from the + destination chroma decimation type.*/ + y4m_ctx->dst_buf_sz = + y4m_ctx->pic_w * y4m_ctx->pic_h + + 2 * ((y4m_ctx->pic_w + y4m_ctx->dst_c_dec_h - 1) / y4m_ctx->dst_c_dec_h) * + ((y4m_ctx->pic_h + y4m_ctx->dst_c_dec_v - 1) / y4m_ctx->dst_c_dec_v); + if (y4m_ctx->bit_depth == 8) + y4m_ctx->dst_buf = (unsigned char *)malloc(y4m_ctx->dst_buf_sz); + else + y4m_ctx->dst_buf = (unsigned char *)malloc(2 * y4m_ctx->dst_buf_sz); + if (!y4m_ctx->dst_buf) return -1; + + if (y4m_ctx->aux_buf_sz > 0) { + y4m_ctx->aux_buf = (unsigned char *)malloc(y4m_ctx->aux_buf_sz); + if (!y4m_ctx->aux_buf) { + free(y4m_ctx->dst_buf); + return -1; + } + } + 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->bit_depth = _y4m->bit_depth; + _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] = _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; + return 1; +} |