gstreamer/ext/mplex/yuv4mpeg.cc

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/*
* yuv4mpeg.c: Functions for reading and writing "new" YUV4MPEG streams
*
* Copyright (C) 2001 Matthew J. Marjanovic <maddog@mir.com>
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <config.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "yuv4mpeg.h"
#include "yuv4mpeg_intern.h"
#include "mjpeg_logging.h"
static int _y4mparam_allow_unknown_tags = 1; /* default is forgiveness */
static void *(*_y4m_alloc) (size_t bytes) = malloc;
static void (*_y4m_free) (void *ptr) = free;
int
y4m_allow_unknown_tags (int yn)
{
int old = _y4mparam_allow_unknown_tags;
if (yn >= 0)
_y4mparam_allow_unknown_tags = (yn) ? 1 : 0;
return old;
}
/*************************************************************************
*
* Convenience functions for fd read/write
*
* - guaranteed to transfer entire payload (or fail)
* - returns:
* 0 on complete success
* +(# of remaining bytes) on eof (for y4m_read)
* -(# of rem. bytes) on error (and ERRNO should be set)
*
*************************************************************************/
ssize_t
y4m_read (int fd, void *buf, size_t len)
{
ssize_t n;
uint8_t *ptr = (uint8_t *) buf;
while (len > 0) {
n = read (fd, ptr, len);
if (n <= 0) {
/* return amount left to read */
if (n == 0)
return len; /* n == 0 --> eof */
else
return -len; /* n < 0 --> error */
}
ptr += n;
len -= n;
}
return 0;
}
ssize_t
y4m_write (int fd, const void *buf, size_t len)
{
ssize_t n;
const uint8_t *ptr = (const uint8_t *) buf;
while (len > 0) {
n = write (fd, ptr, len);
if (n <= 0)
return -len; /* return amount left to write */
ptr += n;
len -= n;
}
return 0;
}
/*************************************************************************
*
* "Extra tags" handling
*
*************************************************************************/
static char *
y4m_new_xtag (void)
{
return (char *) _y4m_alloc (Y4M_MAX_XTAG_SIZE * sizeof (char));
}
void
y4m_init_xtag_list (y4m_xtag_list_t * xtags)
{
int i;
xtags->count = 0;
for (i = 0; i < Y4M_MAX_XTAGS; i++) {
xtags->tags[i] = NULL;
}
}
void
y4m_fini_xtag_list (y4m_xtag_list_t * xtags)
{
int i;
for (i = 0; i < Y4M_MAX_XTAGS; i++) {
if (xtags->tags[i] != NULL) {
_y4m_free (xtags->tags[i]);
xtags->tags[i] = NULL;
}
}
xtags->count = 0;
}
void
y4m_copy_xtag_list (y4m_xtag_list_t * dest, const y4m_xtag_list_t * src)
{
int i;
for (i = 0; i < src->count; i++) {
if (dest->tags[i] == NULL)
dest->tags[i] = y4m_new_xtag ();
strncpy (dest->tags[i], src->tags[i], Y4M_MAX_XTAG_SIZE);
}
dest->count = src->count;
}
static int
y4m_snprint_xtags (char *s, int maxn, const y4m_xtag_list_t * xtags)
{
int i, room;
for (i = 0, room = maxn - 1; i < xtags->count; i++) {
int n = snprintf (s, room + 1, " %s", xtags->tags[i]);
if ((n < 0) || (n > room))
return Y4M_ERR_HEADER;
s += n;
room -= n;
}
s[0] = '\n'; /* finish off header with newline */
s[1] = '\0'; /* ...and end-of-string */
return Y4M_OK;
}
int
y4m_xtag_count (const y4m_xtag_list_t * xtags)
{
return xtags->count;
}
const char *
y4m_xtag_get (const y4m_xtag_list_t * xtags, int n)
{
if (n >= xtags->count)
return NULL;
else
return xtags->tags[n];
}
int
y4m_xtag_add (y4m_xtag_list_t * xtags, const char *tag)
{
if (xtags->count >= Y4M_MAX_XTAGS)
return Y4M_ERR_XXTAGS;
if (xtags->tags[xtags->count] == NULL)
xtags->tags[xtags->count] = y4m_new_xtag ();
strncpy (xtags->tags[xtags->count], tag, Y4M_MAX_XTAG_SIZE);
(xtags->count)++;
return Y4M_OK;
}
int
y4m_xtag_remove (y4m_xtag_list_t * xtags, int n)
{
int i;
char *q;
if ((n < 0) || (n >= xtags->count))
return Y4M_ERR_RANGE;
q = xtags->tags[n];
for (i = n; i < (xtags->count - 1); i++)
xtags->tags[i] = xtags->tags[i + 1];
xtags->tags[i] = q;
(xtags->count)--;
return Y4M_OK;
}
int
y4m_xtag_clearlist (y4m_xtag_list_t * xtags)
{
xtags->count = 0;
return Y4M_OK;
}
int
y4m_xtag_addlist (y4m_xtag_list_t * dest, const y4m_xtag_list_t * src)
{
int i, j;
if ((dest->count + src->count) > Y4M_MAX_XTAGS)
return Y4M_ERR_XXTAGS;
for (i = dest->count, j = 0; j < src->count; i++, j++) {
if (dest->tags[i] == NULL)
dest->tags[i] = y4m_new_xtag ();
strncpy (dest->tags[i], src->tags[i], Y4M_MAX_XTAG_SIZE);
}
dest->count += src->count;
return Y4M_OK;
}
/*************************************************************************
*
* Creators/destructors for y4m_*_info_t structures
*
*************************************************************************/
void
y4m_init_stream_info (y4m_stream_info_t * info)
{
if (info == NULL)
return;
/* initialize info */
info->width = Y4M_UNKNOWN;
info->height = Y4M_UNKNOWN;
info->interlace = Y4M_UNKNOWN;
info->framerate = y4m_fps_UNKNOWN;
info->sampleaspect = y4m_sar_UNKNOWN;
y4m_init_xtag_list (&(info->x_tags));
}
void
y4m_copy_stream_info (y4m_stream_info_t * dest, const y4m_stream_info_t * src)
{
if ((dest == NULL) || (src == NULL))
return;
/* copy info */
dest->width = src->width;
dest->height = src->height;
dest->interlace = src->interlace;
dest->framerate = src->framerate;
dest->sampleaspect = src->sampleaspect;
dest->framelength = src->framelength;
y4m_copy_xtag_list (&(dest->x_tags), &(src->x_tags));
}
void
y4m_fini_stream_info (y4m_stream_info_t * info)
{
if (info == NULL)
return;
y4m_fini_xtag_list (&(info->x_tags));
}
void
y4m_si_set_width (y4m_stream_info_t * si, int width)
{
si->width = width;
si->framelength = (si->height * si->width) * 3 / 2;
}
int
y4m_si_get_width (const y4m_stream_info_t * si)
{
return si->width;
}
void
y4m_si_set_height (y4m_stream_info_t * si, int height)
{
si->height = height;
si->framelength = (si->height * si->width) * 3 / 2;
}
int
y4m_si_get_height (const y4m_stream_info_t * si)
{
return si->height;
}
void
y4m_si_set_interlace (y4m_stream_info_t * si, int interlace)
{
si->interlace = interlace;
}
int
y4m_si_get_interlace (const y4m_stream_info_t * si)
{
return si->interlace;
}
void
y4m_si_set_framerate (y4m_stream_info_t * si, y4m_ratio_t framerate)
{
si->framerate = framerate;
}
y4m_ratio_t
y4m_si_get_framerate (const y4m_stream_info_t * si)
{
return si->framerate;
}
void
y4m_si_set_sampleaspect (y4m_stream_info_t * si, y4m_ratio_t sar)
{
si->sampleaspect = sar;
}
y4m_ratio_t
y4m_si_get_sampleaspect (const y4m_stream_info_t * si)
{
return si->sampleaspect;
}
int
y4m_si_get_framelength (const y4m_stream_info_t * si)
{
return si->framelength;
}
y4m_xtag_list_t *
y4m_si_xtags (y4m_stream_info_t * si)
{
return &(si->x_tags);
}
void
y4m_init_frame_info (y4m_frame_info_t * info)
{
if (info == NULL)
return;
/* initialize info */
y4m_init_xtag_list (&(info->x_tags));
}
void
y4m_copy_frame_info (y4m_frame_info_t * dest, const y4m_frame_info_t * src)
{
if ((dest == NULL) || (src == NULL))
return;
/* copy info */
y4m_copy_xtag_list (&(dest->x_tags), &(src->x_tags));
}
void
y4m_fini_frame_info (y4m_frame_info_t * info)
{
if (info == NULL)
return;
y4m_fini_xtag_list (&(info->x_tags));
}
/*************************************************************************
*
* Tag parsing
*
*************************************************************************/
int
y4m_parse_stream_tags (char *s, y4m_stream_info_t * i)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok (s, Y4M_DELIM); token != NULL; token = strtok (NULL, Y4M_DELIM)) {
if (token[0] == '\0')
continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'W': /* width */
i->width = atoi (value);
if (i->width <= 0)
return Y4M_ERR_RANGE;
break;
case 'H': /* height */
i->height = atoi (value);
if (i->height <= 0)
return Y4M_ERR_RANGE;
break;
case 'F': /* frame rate (fps) */
if ((err = y4m_parse_ratio (&(i->framerate), value)) != Y4M_OK)
return err;
if (i->framerate.n < 0)
return Y4M_ERR_RANGE;
break;
case 'I': /* interlacing */
switch (value[0]) {
case 'p':
i->interlace = Y4M_ILACE_NONE;
break;
case 't':
i->interlace = Y4M_ILACE_TOP_FIRST;
break;
case 'b':
i->interlace = Y4M_ILACE_BOTTOM_FIRST;
break;
case '?':
default:
i->interlace = Y4M_UNKNOWN;
break;
}
break;
case 'A': /* sample (pixel) aspect ratio */
if ((err = y4m_parse_ratio (&(i->sampleaspect), value)) != Y4M_OK)
return err;
if (i->sampleaspect.n < 0)
return Y4M_ERR_RANGE;
break;
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add (&(i->x_tags), token)) != Y4M_OK)
return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add (&(i->x_tags), token)) != Y4M_OK)
return err;
mjpeg_warn ("Unknown stream tag encountered: '%s'", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* Error checking... width and height must be known since we can't
* parse without them
*/
if (i->width == Y4M_UNKNOWN || i->height == Y4M_UNKNOWN)
return Y4M_ERR_HEADER;
/* ta da! done. */
return Y4M_OK;
}
static int
y4m_parse_frame_tags (char *s, y4m_frame_info_t * i)
{
char *token, *value;
char tag;
int err;
/* parse fields */
for (token = strtok (s, Y4M_DELIM); token != NULL; token = strtok (NULL, Y4M_DELIM)) {
if (token[0] == '\0')
continue; /* skip empty strings */
tag = token[0];
value = token + 1;
switch (tag) {
case 'X': /* 'X' meta-tag */
if ((err = y4m_xtag_add (&(i->x_tags), token)) != Y4M_OK)
return err;
break;
default:
/* possible error on unknown options */
if (_y4mparam_allow_unknown_tags) {
/* unknown tags ok: store in xtag list and warn... */
if ((err = y4m_xtag_add (&(i->x_tags), token)) != Y4M_OK)
return err;
mjpeg_warn ("Unknown frame tag encountered: '%s'", token);
} else {
/* unknown tags are *not* ok */
return Y4M_ERR_BADTAG;
}
break;
}
}
/* ta da! done. */
return Y4M_OK;
}
/*************************************************************************
*
* Read/Write stream header
*
*************************************************************************/
int
y4m_read_stream_header (int fd, y4m_stream_info_t * i)
{
char line[Y4M_LINE_MAX];
char *p;
int n;
int err;
/* read the header line */
for (n = 0, p = line; n < Y4M_LINE_MAX; n++, p++) {
if (read (fd, p, 1) < 1)
return Y4M_ERR_SYSTEM;
if (*p == '\n') {
*p = '\0'; /* Replace linefeed by end of string */
break;
}
}
if (n >= Y4M_LINE_MAX)
return Y4M_ERR_HEADER;
/* look for keyword in header */
if (strncmp (line, Y4M_MAGIC, strlen (Y4M_MAGIC)))
return Y4M_ERR_MAGIC;
if ((err = y4m_parse_stream_tags (line + strlen (Y4M_MAGIC), i)) != Y4M_OK)
return err;
i->framelength = (i->height * i->width) * 3 / 2;
return Y4M_OK;
}
int
y4m_write_stream_header (int fd, const y4m_stream_info_t * i)
{
char s[Y4M_LINE_MAX + 1];
int n;
int err;
y4m_ratio_t rate = i->framerate;
y4m_ratio_t aspect = i->sampleaspect;
y4m_ratio_reduce (&rate);
y4m_ratio_reduce (&aspect);
n = snprintf (s, sizeof (s), "%s W%d H%d F%d:%d I%s A%d:%d",
Y4M_MAGIC,
i->width,
i->height,
rate.n, rate.d,
(i->interlace == Y4M_ILACE_NONE) ? "p" :
(i->interlace == Y4M_ILACE_TOP_FIRST) ? "t" :
(i->interlace == Y4M_ILACE_BOTTOM_FIRST) ? "b" : "?", aspect.n, aspect.d);
if ((n < 0) || (n > Y4M_LINE_MAX))
return Y4M_ERR_HEADER;
if ((err = y4m_snprint_xtags (s + n, sizeof (s) - n - 1, &(i->x_tags)))
!= Y4M_OK)
return err;
/* non-zero on error */
return (y4m_write (fd, s, strlen (s)) ? Y4M_ERR_SYSTEM : Y4M_OK);
}
/*************************************************************************
*
* Read/Write frame header
*
*************************************************************************/
int
y4m_read_frame_header (int fd, y4m_frame_info_t * i)
{
char line[Y4M_LINE_MAX];
char *p;
int n;
ssize_t remain;
/* This is more clever than read_stream_header...
Try to read "FRAME\n" all at once, and don't try to parse
if nothing else is there...
*/
remain = y4m_read (fd, line, sizeof (Y4M_FRAME_MAGIC) - 1 + 1); /* -'\0', +'\n' */
if (remain < 0)
return Y4M_ERR_SYSTEM;
if (remain > 0) {
/* A clean EOF should end exactly at a frame-boundary */
if (remain == sizeof (Y4M_FRAME_MAGIC))
return Y4M_ERR_EOF;
else
return Y4M_ERR_BADEOF;
}
if (strncmp (line, Y4M_FRAME_MAGIC, sizeof (Y4M_FRAME_MAGIC) - 1))
return Y4M_ERR_MAGIC;
if (line[sizeof (Y4M_FRAME_MAGIC) - 1] == '\n')
return Y4M_OK; /* done -- no tags: that was the end-of-line. */
if (line[sizeof (Y4M_FRAME_MAGIC) - 1] != Y4M_DELIM[0]) {
return Y4M_ERR_MAGIC; /* wasn't a space -- what was it? */
}
/* proceed to get the tags... (overwrite the magic) */
for (n = 0, p = line; n < Y4M_LINE_MAX; n++, p++) {
if (y4m_read (fd, p, 1))
return Y4M_ERR_SYSTEM;
if (*p == '\n') {
*p = '\0'; /* Replace linefeed by end of string */
break;
}
}
if (n >= Y4M_LINE_MAX)
return Y4M_ERR_HEADER;
/* non-zero on error */
return y4m_parse_frame_tags (line, i);
}
int
y4m_write_frame_header (int fd, const y4m_frame_info_t * i)
{
char s[Y4M_LINE_MAX + 1];
int n;
int err;
n = snprintf (s, sizeof (s), "%s", Y4M_FRAME_MAGIC);
if ((n < 0) || (n > Y4M_LINE_MAX))
return Y4M_ERR_HEADER;
if ((err = y4m_snprint_xtags (s + n, sizeof (s) - n - 1, &(i->x_tags)))
!= Y4M_OK)
return err;
/* non-zero on error */
return (y4m_write (fd, s, strlen (s)) ? Y4M_ERR_SYSTEM : Y4M_OK);
}
/*************************************************************************
*
* Read/Write entire frame
*
*************************************************************************/
int
y4m_read_frame (int fd, const y4m_stream_info_t * si, y4m_frame_info_t * fi, uint8_t * const yuv[3])
{
int err;
int w = si->width;
int h = si->height;
/* Read frame header */
if ((err = y4m_read_frame_header (fd, fi)) != Y4M_OK)
return err;
/* Read luminance scanlines */
if (y4m_read (fd, yuv[0], w * h))
return Y4M_ERR_SYSTEM;
/* Read chrominance scanlines */
if (y4m_read (fd, yuv[1], w * h / 4))
return Y4M_ERR_SYSTEM;
if (y4m_read (fd, yuv[2], w * h / 4))
return Y4M_ERR_SYSTEM;
return Y4M_OK;
}
int
y4m_write_frame (int fd, const y4m_stream_info_t * si,
const y4m_frame_info_t * fi, uint8_t * const yuv[3])
{
int err;
int w = si->width;
int h = si->height;
/* Write frame header */
if ((err = y4m_write_frame_header (fd, fi)) != Y4M_OK)
return err;
/* Write luminance,chrominance scanlines */
if (y4m_write (fd, yuv[0], w * h) ||
y4m_write (fd, yuv[1], w * h / 4) || y4m_write (fd, yuv[2], w * h / 4))
return Y4M_ERR_SYSTEM;
return Y4M_OK;
}
/*************************************************************************
*
* Read/Write entire frame, (de)interleaved (to)from two separate fields
*
*************************************************************************/
int
y4m_read_fields (int fd, const y4m_stream_info_t * si, y4m_frame_info_t * fi,
uint8_t * const upper_field[3], uint8_t * const lower_field[3])
{
int i, y, err;
int width = si->width;
int height = si->height;
/* Read frame header */
if ((err = y4m_read_frame_header (fd, fi)) != Y4M_OK)
return err;
/* Read Y', Cb, and Cr planes */
for (i = 0; i < 3; i++) {
uint8_t *srctop = upper_field[i];
uint8_t *srcbot = lower_field[i];
/* alternately write one line from each */
for (y = 0; y < height; y += 2) {
if (y4m_read (fd, srctop, width))
return Y4M_ERR_SYSTEM;
srctop += width;
if (y4m_read (fd, srcbot, width))
return Y4M_ERR_SYSTEM;
srcbot += width;
}
/* for chroma, width/height are half as big */
if (i == 0) {
width /= 2;
height /= 2;
}
}
return Y4M_OK;
}
int
y4m_write_fields (int fd, const y4m_stream_info_t * si,
const y4m_frame_info_t * fi,
uint8_t * const upper_field[3], uint8_t * const lower_field[3])
{
int i, y, err;
int width = si->width;
int height = si->height;
/* Write frame header */
if ((err = y4m_write_frame_header (fd, fi)) != Y4M_OK)
return err;
/* Write Y', Cb, and Cr planes */
for (i = 0; i < 3; i++) {
uint8_t *srctop = upper_field[i];
uint8_t *srcbot = lower_field[i];
/* alternately write one line from each */
for (y = 0; y < height; y += 2) {
if (y4m_write (fd, srctop, width))
return Y4M_ERR_SYSTEM;
srctop += width;
if (y4m_write (fd, srcbot, width))
return Y4M_ERR_SYSTEM;
srcbot += width;
}
/* for chroma, width/height are half as big */
if (i == 0) {
width /= 2;
height /= 2;
}
}
return Y4M_OK;
}
/*************************************************************************
*
* Handy logging of stream info
*
*************************************************************************/
void
y4m_log_stream_info (log_level_t level, const char *prefix, const y4m_stream_info_t * i)
{
char s[256];
snprintf (s, sizeof (s), " frame size: ");
if (i->width == Y4M_UNKNOWN)
snprintf (s + strlen (s), sizeof (s) - strlen (s), "(?)x");
else
snprintf (s + strlen (s), sizeof (s) - strlen (s), "%dx", i->width);
if (i->height == Y4M_UNKNOWN)
snprintf (s + strlen (s), sizeof (s) - strlen (s), "(?) pixels ");
else
snprintf (s + strlen (s), sizeof (s) - strlen (s), "%d pixels ", i->height);
if (i->framelength == Y4M_UNKNOWN)
snprintf (s + strlen (s), sizeof (s) - strlen (s), "(? bytes)");
else
snprintf (s + strlen (s), sizeof (s) - strlen (s), "(%d bytes)", i->framelength);
mjpeg_log (level, "%s%s", prefix, s);
if ((i->framerate.n == 0) && (i->framerate.d == 0))
mjpeg_log (level, "%s frame rate: ??? fps", prefix);
else
mjpeg_log (level, "%s frame rate: %d/%d fps (~%f)", prefix,
i->framerate.n, i->framerate.d, (double) i->framerate.n / (double) i->framerate.d);
mjpeg_log (level, "%s interlace: %s", prefix,
(i->interlace == Y4M_ILACE_NONE) ? "none/progressive" :
(i->interlace == Y4M_ILACE_TOP_FIRST) ? "top-field-first" :
(i->interlace == Y4M_ILACE_BOTTOM_FIRST) ? "bottom-field-first" : "anyone's guess");
if ((i->sampleaspect.n == 0) && (i->sampleaspect.d == 0))
mjpeg_log (level, "%ssample aspect ratio: ?:?", prefix);
else
mjpeg_log (level, "%ssample aspect ratio: %d:%d", prefix,
i->sampleaspect.n, i->sampleaspect.d);
}
/*************************************************************************
*
* Convert error code to string
*
*************************************************************************/
const char *
y4m_strerr (int err)
{
switch (err) {
case Y4M_OK:
return "no error";
case Y4M_ERR_RANGE:
return "parameter out of range";
case Y4M_ERR_SYSTEM:
return "system error (failed read/write)";
case Y4M_ERR_HEADER:
return "bad stream or frame header";
case Y4M_ERR_BADTAG:
return "unknown header tag";
case Y4M_ERR_MAGIC:
return "bad header magic";
case Y4M_ERR_XXTAGS:
return "too many xtags";
case Y4M_ERR_EOF:
return "end-of-file";
case Y4M_ERR_BADEOF:
return "stream ended unexpectedly (EOF)";
default:
return "unknown error code";
}
}