gstreamer/gst-libs/gst/rtsp/gstrtsprange.c
2012-11-03 23:05:09 +00:00

283 lines
7.7 KiB
C

/* GStreamer
* Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/**
* SECTION:gstrtsprange
* @short_description: dealing with time ranges
*
* Provides helper functions to deal with time ranges.
*
* Last reviewed on 2007-07-25 (0.10.14)
*/
#include <stdio.h>
#include <string.h>
#include "gstrtsprange.h"
static gdouble
gst_strtod (const gchar * dstr)
{
gchar s[G_ASCII_DTOSTR_BUF_SIZE] = { 0, };
/* canonicalise floating point string so we can handle float strings
* in the form "24.930" or "24,930" irrespective of the current locale.
* We should always be getting floats in 24.930 format with a floating point,
* but let's accept malformed ones as well, easy mistake to make after all */
g_strlcpy (s, dstr, sizeof (s));
g_strdelimit (s, ",", '.');
return g_ascii_strtod (s, NULL);
}
/* npt-time = "now" | npt-sec | npt-hhmmss
* npt-sec = 1*DIGIT [ "." *DIGIT ]
* npt-hhmmss = npt-hh ":" npt-mm ":" npt-ss [ "." *DIGIT ]
* npt-hh = 1*DIGIT ; any positive number
* npt-mm = 1*2DIGIT ; 0-59
* npt-ss = 1*2DIGIT ; 0-59
*/
static GstRTSPResult
parse_npt_time (const gchar * str, GstRTSPTime * time)
{
if (strncmp (str, "now", 3) == 0) {
time->type = GST_RTSP_TIME_NOW;
} else if (str[0] == '\0') {
time->type = GST_RTSP_TIME_END;
} else if (strstr (str, ":")) {
gint hours, mins;
sscanf (str, "%2d:%2d:", &hours, &mins);
str = strchr (str, ':') + 1;
str = strchr (str, ':') + 1;
time->type = GST_RTSP_TIME_SECONDS;
time->seconds = ((hours * 60) + mins) * 60 + gst_strtod (str);
} else {
time->type = GST_RTSP_TIME_SECONDS;
time->seconds = gst_strtod (str);
}
return GST_RTSP_OK;
}
/* npt-range = ( npt-time "-" [ npt-time ] ) | ( "-" npt-time )
*/
static GstRTSPResult
parse_npt_range (const gchar * str, GstRTSPTimeRange * range)
{
GstRTSPResult res;
gchar *p;
range->unit = GST_RTSP_RANGE_NPT;
/* find '-' separator */
p = strstr (str, "-");
if (p == NULL)
return GST_RTSP_EINVAL;
if ((res = parse_npt_time (str, &range->min)) != GST_RTSP_OK)
goto done;
res = parse_npt_time (p + 1, &range->max);
done:
return res;
}
static GstRTSPResult
parse_clock_range (const gchar * str, GstRTSPTimeRange * range)
{
return GST_RTSP_ENOTIMPL;
}
static GstRTSPResult
parse_smpte_range (const gchar * str, GstRTSPTimeRange * range)
{
return GST_RTSP_ENOTIMPL;
}
/**
* gst_rtsp_range_parse:
* @rangestr: a range string to parse
* @range: location to hold the #GstRTSPTimeRange result
*
* Parse @rangestr to a #GstRTSPTimeRange.
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_range_parse (const gchar * rangestr, GstRTSPTimeRange ** range)
{
GstRTSPResult ret;
GstRTSPTimeRange *res;
gchar *p;
g_return_val_if_fail (rangestr != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (range != NULL, GST_RTSP_EINVAL);
res = g_new0 (GstRTSPTimeRange, 1);
p = (gchar *) rangestr;
/* first figure out the units of the range */
if (g_str_has_prefix (p, "npt=")) {
ret = parse_npt_range (p + 4, res);
} else if (g_str_has_prefix (p, "clock=")) {
ret = parse_clock_range (p + 6, res);
} else if (g_str_has_prefix (p, "smpte=")) {
res->unit = GST_RTSP_RANGE_SMPTE;
ret = parse_smpte_range (p + 6, res);
} else if (g_str_has_prefix (p, "smpte-30-drop=")) {
res->unit = GST_RTSP_RANGE_SMPTE_30_DROP;
ret = parse_smpte_range (p + 14, res);
} else if (g_str_has_prefix (p, "smpte-25=")) {
res->unit = GST_RTSP_RANGE_SMPTE_25;
ret = parse_smpte_range (p + 9, res);
} else
goto invalid;
if (ret != GST_RTSP_OK)
goto invalid;
*range = res;
return ret;
/* ERRORS */
invalid:
{
gst_rtsp_range_free (res);
return GST_RTSP_EINVAL;
}
}
static gboolean
npt_time_string (const GstRTSPTime * time, GString * string)
{
gchar dstrbuf[G_ASCII_DTOSTR_BUF_SIZE] = { 0, };
gboolean res = TRUE;;
switch (time->type) {
case GST_RTSP_TIME_SECONDS:
/* need to format floating point value strings as in C locale */
g_ascii_dtostr (dstrbuf, G_ASCII_DTOSTR_BUF_SIZE, time->seconds);
g_string_append (string, dstrbuf);
break;
case GST_RTSP_TIME_NOW:
g_string_append (string, "now");
break;
case GST_RTSP_TIME_END:
break;
default:
res = FALSE;
break;
}
return res;
}
static gboolean
npt_range_string (const GstRTSPTimeRange * range, GString * string)
{
gboolean res;
if (!(res = npt_time_string (&range->min, string)))
goto done;
g_string_append (string, "-");
if (!(res = npt_time_string (&range->max, string)))
goto done;
done:
return res;
}
/**
* gst_rtsp_range_to_string:
* @range: a #GstRTSPTimeRange
*
* Convert @range into a string representation.
*
* Returns: The string representation of @range. g_free() after usage.
*/
gchar *
gst_rtsp_range_to_string (const GstRTSPTimeRange * range)
{
gchar *result = NULL;
GString *string;
g_return_val_if_fail (range != NULL, NULL);
string = g_string_new ("");
switch (range->unit) {
case GST_RTSP_RANGE_NPT:
g_string_append (string, "npt=");
if (!npt_range_string (range, string)) {
g_string_free (string, TRUE);
string = NULL;
}
break;
case GST_RTSP_RANGE_SMPTE:
case GST_RTSP_RANGE_SMPTE_30_DROP:
case GST_RTSP_RANGE_SMPTE_25:
case GST_RTSP_RANGE_CLOCK:
default:
g_warning ("time range unit not yet implemented");
g_string_free (string, TRUE);
string = NULL;
break;
}
if (string)
result = g_string_free (string, FALSE);
return result;
}
/**
* gst_rtsp_range_free:
* @range: a #GstRTSPTimeRange
*
* Free the memory allocated by @range.
*/
void
gst_rtsp_range_free (GstRTSPTimeRange * range)
{
g_free (range);
}