* 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>
}
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++;
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;
}
+// 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 = '?';
+ 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):
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)))
}
}
-/*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.
(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;
+static const char TAG[] = "YUV4MPEG2";
+
+int y4m_input_open(y4m_input *y4m_ctx, FILE *file, char *skip_buffer,
+ int num_skip, 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);
}
- /*We skipped too much header data.*/
- if (_nskip > 0) return -1;
- if (i == 79) {
- fprintf(stderr, "Error parsing header; not a YUV2MPEG2 file?\n");
+ // 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;
}
- buffer[i] = '\0';
- if (memcmp(buffer, "YUV4MPEG", 8)) {
- fprintf(stderr, "Incomplete magic for YUV4MPEG file.\n");
+ if (memcmp(TAG, tag_buffer, 9) != 0) {
+ fprintf(stderr, "Error parsing header: must start with %s\n", TAG);
return -1;
}
- if (buffer[8] != '2') {
- fprintf(stderr, "Incorrect YUV input file version; YUV4MPEG2 required.\n");
+ // 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;
}
- ret = y4m_parse_tags(_y4m, buffer + 5);
- if (ret < 0) {
- fprintf(stderr, "Error parsing YUV4MPEG2 header.\n");
- return ret;
+ if (!parse_tags(y4m_ctx, file)) {
+ fprintf(stderr, "Error parsing %s header.\n", TAG);
}
- if (_y4m->interlace == '?') {
+ if (y4m_ctx->interlace == '?') {
fprintf(stderr,
"Warning: Input video interlacing format unknown; "
"assuming progressive scan.\n");
- } else if (_y4m->interlace != 'p') {
+ } else if (y4m_ctx->interlace != 'p') {
fprintf(stderr,
"Input video is interlaced; "
"Only progressive scan handled.\n");
return -1;
}
- _y4m->vpx_fmt = VPX_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);
+ y4m_ctx->vpx_fmt = VPX_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->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));
+ 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->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
- _y4m->convert = y4m_convert_null;
- _y4m->bit_depth = 10;
- _y4m->bps = 15;
- _y4m->vpx_fmt = VPX_IMG_FMT_I42016;
+ 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->vpx_fmt = VPX_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));
+ } 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->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
- _y4m->convert = y4m_convert_null;
- _y4m->bit_depth = 12;
- _y4m->bps = 18;
- _y4m->vpx_fmt = VPX_IMG_FMT_I42016;
+ 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->vpx_fmt = VPX_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;
+ } 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->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;
+ 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->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;
+ 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->dst_c_dec_h = 2;
- _y4m->dst_c_dec_v = 2;
- _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
+ 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->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;
+ 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->vpx_fmt = VPX_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;
+ y4m_ctx->vpx_fmt = VPX_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->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
- _y4m->convert = y4m_convert_null;
+ y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0;
+ y4m_ctx->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->vpx_fmt = VPX_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;
+ } 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->vpx_fmt = VPX_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->chroma_type, "422p12") == 0) {
- _y4m->src_c_dec_h = 2;
- _y4m->src_c_dec_v = 1;
- _y4m->vpx_fmt = VPX_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;
+ } 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->vpx_fmt = VPX_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->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;
+ } 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->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;
+ 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;
+ fprintf(stderr, "Unsupported conversion from yuv 411\n");
+ return -1;
+ } 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->dst_c_dec_h = 2;
- _y4m->dst_c_dec_v = 2;
- _y4m->dst_buf_read_sz = _y4m->pic_w * _y4m->pic_h;
+ 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->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;
+ 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->vpx_fmt = VPX_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;
+ y4m_ctx->vpx_fmt = VPX_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->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
- _y4m->convert = y4m_convert_null;
+ y4m_ctx->aux_buf_sz = y4m_ctx->aux_buf_read_sz = 0;
+ y4m_ctx->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->vpx_fmt = VPX_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;
+ } 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->vpx_fmt = VPX_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->chroma_type, "444p12") == 0) {
- _y4m->src_c_dec_h = 1;
- _y4m->src_c_dec_v = 1;
- _y4m->vpx_fmt = VPX_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;
+ } 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->vpx_fmt = VPX_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->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->vpx_fmt = VPX_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;
+ } 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->aux_buf_sz = _y4m->aux_buf_read_sz = 0;
- _y4m->convert = y4m_convert_mono_420jpeg;
+ 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->chroma_type);
+ 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->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);
+ 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->dst_buf = (unsigned char *)malloc(2 * _y4m->dst_buf_sz);
+ y4m_ctx->dst_buf = (unsigned char *)malloc(2 * y4m_ctx->dst_buf_sz);
+ if (!y4m_ctx->dst_buf) return -1;
- if (_y4m->aux_buf_sz > 0)
- _y4m->aux_buf = (unsigned char *)malloc(_y4m->aux_buf_sz);
+ 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;
}