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mpv/libmpdemux/yuv4mpeg.c

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/*
* yuv4mpeg.c: Functions for reading and writing "new" YUV4MPEG streams
*
* Copyright (C) 2001 Matthew J. Marjanovic <maddog@mir.com>
*
* This file is ripped from the lavtools package (mjpeg.sourceforge.net)
* Ported to mplayer by Rik Snel <snel@phys.uu.nl>
*
* 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 "mp_msg.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(stream_t *s, char *buf, size_t len)
{
ssize_t n;
while (len > 0) {
n = stream_read(s, buf, len);
if (n <= 0) {
/* return amount left to read */
if (n == 0)
return len; /* n == 0 --> eof */
else
return -len; /* n < 0 --> error */
}
buf += n;
len -= n;
}
return 0;
}
#if 0 /* not needed */
ssize_t y4m_write(int fd, char *buf, size_t len)
{
ssize_t n;
while (len > 0) {
n = write(fd, buf, len);
if (n < 0) return -len; /* return amount left to write */
buf += n;
len -= n;
}
return 0;
}
#endif
/*************************************************************************
*
* "Extra tags" handling
*
*************************************************************************/
static char *y4m_new_xtag()
{
return _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, 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, 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;
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(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(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(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(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(y4m_stream_info_t *si)
{ return si->sampleaspect; }
int y4m_si_get_framelength(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, 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;
mp_msg(MSGT_DEMUX, MSGL_WARN, "Unknown stream tag encountered: '%s'\n", 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;
mp_msg(MSGT_DEMUX, MSGL_WARN, "Unknown frame tag encountered: '%s'\n", 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(stream_t *s, 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 (y4m_read(s, 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;
/* 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;
}
#if 0
int y4m_write_stream_header(int fd, y4m_stream_info_t *i)
{
char s[Y4M_LINE_MAX+1];
int n;
int err;
y4m_ratio_reduce(&(i->framerate));
y4m_ratio_reduce(&(i->sampleaspect));
n = snprintf(s, sizeof(s), "%s W%d H%d F%d:%d I%s A%d:%d",
Y4M_MAGIC,
i->width,
i->height,
i->framerate.n, i->framerate.d,
(i->interlace == Y4M_ILACE_NONE) ? "p" :
(i->interlace == Y4M_ILACE_TOP_FIRST) ? "t" :
(i->interlace == Y4M_ILACE_BOTTOM_FIRST) ? "b" : "?",
i->sampleaspect.n, i->sampleaspect.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);
}
#endif
/*************************************************************************
*
* Read/Write frame header
*
*************************************************************************/
int y4m_read_frame_header(stream_t *s, 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(s, line, sizeof(Y4M_FRAME_MAGIC));
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_SYSTEM;
}
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(s, 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);
}
#if 0
int y4m_write_frame_header(int fd, 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);
}
#endif
/*************************************************************************
*
* Read/Write entire frame
*
*************************************************************************/
int y4m_read_frame(stream_t *s, y4m_stream_info_t *si,
y4m_frame_info_t *fi, unsigned char *yuv[3])
{
int err;
int w = si->width;
int h = si->height;
/* Read frame header */
if ((err = y4m_read_frame_header(s, fi)) != Y4M_OK) return err;
/* Read luminance scanlines */
if (y4m_read(s, yuv[0], w*h)) return Y4M_ERR_SYSTEM;
/* Read chrominance scanlines */
if (y4m_read(s, yuv[1], w*h/4)) return Y4M_ERR_SYSTEM;
if (y4m_read(s, yuv[2], w*h/4)) return Y4M_ERR_SYSTEM;
return Y4M_OK;
}
#if 0
int y4m_write_frame(int fd, y4m_stream_info_t *si,
y4m_frame_info_t *fi, unsigned char *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;
}
#endif
/*************************************************************************
*
* Read/Write entire frame, (de)interleaved (to)from two separate fields
*
*************************************************************************/
#if 0
int y4m_read_fields(int fd, y4m_stream_info_t *si, y4m_frame_info_t *fi,
unsigned char *upper_field[3],
unsigned char *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++) {
unsigned char *srctop = upper_field[i];
unsigned char *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, y4m_stream_info_t *si, y4m_frame_info_t *fi,
unsigned char *upper_field[3],
unsigned char *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++) {
unsigned char *srctop = upper_field[i];
unsigned char *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;
}
#endif
/*************************************************************************
*
* Handy logging of stream info
*
*************************************************************************/
void y4m_log_stream_info(const char *prefix, 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);
mp_msg(MSGT_DEMUX, MSGL_V, "%s%s\n", prefix, s);
if ((i->framerate.n == 0) && (i->framerate.d == 0))
mp_msg(MSGT_DEMUX, MSGL_V, "%s frame rate: ??? fps\n", prefix);
else
mp_msg(MSGT_DEMUX, MSGL_V, "%s frame rate: %d/%d fps (~%f)\n", prefix,
i->framerate.n, i->framerate.d,
(double) i->framerate.n / (double) i->framerate.d);
mp_msg(MSGT_DEMUX, MSGL_V, "%s interlace: %s\n", 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))
mp_msg(MSGT_DEMUX, MSGL_V, "%ssample aspect ratio: ?:?\n", prefix);
else
mp_msg(MSGT_DEMUX, MSGL_V, "%ssample aspect ratio: %d:%d\n", 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 "stream ended unexpectedly (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";
default:
return "unknown error code";
}
}
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