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author | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-12-27 02:08:31 +0000 |
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committer | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2001-12-27 02:08:31 +0000 |
commit | 5194d8791e30f968e569b6b452f9b4374298a539 (patch) | |
tree | 17046c404b6a50823a0a5992328c33403f405559 /libmpdemux/yuv4mpeg.c | |
parent | fc8277500b16781708ab2ac5a2c6cbe25913bb77 (diff) | |
download | mpv-5194d8791e30f968e569b6b452f9b4374298a539.tar.bz2 mpv-5194d8791e30f968e569b6b452f9b4374298a539.tar.xz |
yuv4mpeg2 (mjpegtools) support by Rik Snel <rsnel@cube.dyndns.org>
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3787 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpdemux/yuv4mpeg.c')
-rw-r--r-- | libmpdemux/yuv4mpeg.c | 766 |
1 files changed, 766 insertions, 0 deletions
diff --git a/libmpdemux/yuv4mpeg.c b/libmpdemux/yuv4mpeg.c new file mode 100644 index 0000000000..c96843e86e --- /dev/null +++ b/libmpdemux/yuv4mpeg.c @@ -0,0 +1,766 @@ +/* + * 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"; + } +} + + |