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gstreamer/gst-libs/gst/rtsp/gstrtsprange.c

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/* 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 <math.h>
#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' || str[0] == '-') {
time->type = GST_RTSP_TIME_END;
} else if (strstr (str, ":")) {
gint hours, mins;
if (sscanf (str, "%2d:%2d:", &hours, &mins) != 2)
return GST_RTSP_EINVAL;
str = strchr (str, ':');
str = strchr (str + 1, ':');
if (str == NULL)
return GST_RTSP_EINVAL;
time->type = GST_RTSP_TIME_SECONDS;
time->seconds = ((hours * 60) + mins) * 60 + gst_strtod (str + 1);
} 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);
/* a single - is not allowed */
if (range->min.type == GST_RTSP_TIME_END
&& range->max.type == GST_RTSP_TIME_END)
return GST_RTSP_EINVAL;
done:
return res;
}
/* utc-time = utc-date "T" utc-time "Z"
* utc-date = 8DIGIT ; < YYYYMMDD >
* utc-time = 6DIGIT [ "." fraction ] ; < HHMMSS.fraction >
*
* Example for November 8, 1996 at 14h37 and 20 and a quarter seconds
* UTC:
*
* 19961108T143720.25Z
*/
static GstRTSPResult
parse_utc_time (const gchar * str, GstRTSPTime * time, GstRTSPTime2 * time2,
const gchar * limit)
{
if (str[0] == '\0') {
time->type = GST_RTSP_TIME_END;
return GST_RTSP_OK;
} else {
gint year, month, day;
gint hours, mins;
gdouble secs;
gchar *T, *Z;
T = strchr (str, 'T');
if (T == NULL || T != str + 8)
return GST_RTSP_EINVAL;
Z = strchr (T + 1, 'Z');
if (Z == NULL)
return GST_RTSP_EINVAL;
time->type = GST_RTSP_TIME_UTC;
if (sscanf (str, "%4d%2d%2dT%2d%2d%lfZ", &year, &month, &day, &hours,
&mins, &secs) != 6)
return GST_RTSP_EINVAL;
time2->year = year;
time2->month = month;
time2->day = day;
time->seconds = ((hours * 60) + mins) * 60 + secs;
}
return GST_RTSP_OK;
}
/* utc-range = "clock" "=" utc-time "-" [ utc-time ]
*/
static GstRTSPResult
parse_utc_range (const gchar * str, GstRTSPTimeRange * range)
{
GstRTSPResult res;
gchar *p;
range->unit = GST_RTSP_RANGE_CLOCK;
/* find '-' separator, can't have a single - */
p = strstr (str, "-");
if (p == NULL || p == str)
return GST_RTSP_EINVAL;
if ((res = parse_utc_time (str, &range->min, &range->min2, p)) != GST_RTSP_OK)
goto done;
res = parse_utc_time (p + 1, &range->max, &range->max2, NULL);
done:
return res;
}
/* smpte-time = 1*2DIGIT ":" 1*2DIGIT ":" 1*2DIGIT [ ":" 1*2DIGIT ]
* [ "." 1*2DIGIT ]
* hours:minutes:seconds:frames.subframes
*/
static GstRTSPResult
parse_smpte_time (const gchar * str, GstRTSPTime * time, GstRTSPTime2 * time2,
const gchar * limit)
{
gint hours, mins, secs;
if (str[0] == '\0') {
time->type = GST_RTSP_TIME_END;
return GST_RTSP_OK;
} else {
if (sscanf (str, "%2d:%2d:%2d", &hours, &mins, &secs) != 3)
return GST_RTSP_EINVAL;
time->type = GST_RTSP_TIME_FRAMES;
time->seconds = ((hours * 60) + mins) * 60 + secs;
str = strchr (str, ':');
str = strchr (str + 1, ':');
str = strchr (str + 1, ':');
if (str && (limit == NULL || str < limit))
time2->frames = gst_strtod (str + 1);
}
return GST_RTSP_OK;
}
/* smpte-range = smpte-type "=" smpte-time "-" [ smpte-time ]
*/
static GstRTSPResult
parse_smpte_range (const gchar * str, GstRTSPTimeRange * range)
{
GstRTSPResult res;
gchar *p;
/* find '-' separator, can't have a single - */
p = strstr (str, "-");
if (p == NULL || p == str)
return GST_RTSP_EINVAL;
if ((res =
parse_smpte_time (str, &range->min, &range->min2, p)) != GST_RTSP_OK)
goto done;
res = parse_smpte_time (p + 1, &range->max, &range->max2, NULL);
done:
return res;
}
/**
* 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_utc_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 void
string_append_dtostr (GString * string, gdouble value, guint precision)
{
gchar dstrbuf[G_ASCII_DTOSTR_BUF_SIZE] = { 0, };
gchar *dot;
guint len;
precision++;
if (value != 0.0)
value += 4.9 * pow (10.0, precision * -1.0);
g_ascii_dtostr (dstrbuf, G_ASCII_DTOSTR_BUF_SIZE, value);
dot = strchr (dstrbuf, '.');
if (dot == NULL)
goto done;
for (; *dot != '.' && *dot != '0'; dot++);
if ((dot - dstrbuf) + precision < G_ASCII_DTOSTR_BUF_SIZE)
dot[precision] = 0;
len = strlen (dstrbuf);
while (dstrbuf[len - 1] == '0')
dstrbuf[--len] = 0;
if (dstrbuf[len - 1] == '.')
dstrbuf[--len] = 0;
done:
g_string_append (string, dstrbuf);
}
static gboolean
time_to_string (const GstRTSPTime * t1, const GstRTSPTime2 * t2,
GString * string)
{
gboolean res = TRUE;;
switch (t1->type) {
case GST_RTSP_TIME_SECONDS:
/* need to format floating point value strings as in C locale */
string_append_dtostr (string, t1->seconds +
(t1->seconds ? 0.00000000005 : 0), 9);
break;
case GST_RTSP_TIME_NOW:
g_string_append (string, "now");
break;
case GST_RTSP_TIME_END:
break;
case GST_RTSP_TIME_FRAMES:
{
gint64 sec = t1->seconds;
/* need to format floating point value strings as in C locale */
g_string_append_printf (string, "%d:%02d:%02d", (gint) sec / (60 * 60),
(gint) (sec % (60 * 60)) / 60, (gint) sec % 60);
if (t2->frames > 0.0) {
g_string_append_printf (string, ":%s", t2->frames < 10 ? "0" : "");
string_append_dtostr (string, t2->frames + 0.005, 2);
}
break;
}
case GST_RTSP_TIME_UTC:
{
gint64 sec = t1->seconds;
gint hours, minutes;
gdouble seconds;
hours = sec / (60 * 60);
sec -= hours * 60 * 60;
minutes = sec / 60;
sec = ((hours * 60) + minutes) * 60;
seconds = t1->seconds - sec;
if (seconds)
seconds += 0.00000000005;
g_string_append_printf (string, "%04d%02d%02dT%02d%02d%s",
t2->year, t2->month, t2->day, hours, minutes,
seconds < 10 ? "0" : "");
string_append_dtostr (string, seconds, 9);
g_string_append (string, "Z");
break;
}
default:
res = FALSE;
break;
}
return res;
}
static gboolean
range_to_string (const GstRTSPTimeRange * range, GString * string)
{
gboolean res;
if (!(res = time_to_string (&range->min, &range->min2, string)))
goto done;
g_string_append (string, "-");
if (!(res = time_to_string (&range->max, &range->max2, 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)
{
GString *string;
g_return_val_if_fail (range != NULL, NULL);
switch (range->unit) {
case GST_RTSP_RANGE_NPT:
string = g_string_new ("npt=");
break;
case GST_RTSP_RANGE_SMPTE:
case GST_RTSP_RANGE_SMPTE_30_DROP:
string = g_string_new ("smpte=");
break;
case GST_RTSP_RANGE_SMPTE_25:
string = g_string_new ("smpte-25=");
break;
case GST_RTSP_RANGE_CLOCK:
string = g_string_new ("clock=");
break;
default:
goto not_implemented;
}
if (!range_to_string (range, string))
goto format_failed;
return g_string_free (string, FALSE);
/* ERRORS */
not_implemented:
{
g_warning ("time range unit not yet implemented");
return NULL;
}
format_failed:
{
g_string_free (string, TRUE);
return NULL;
}
}
/**
* gst_rtsp_range_free:
* @range: a #GstRTSPTimeRange
*
* Free the memory allocated by @range.
*/
void
gst_rtsp_range_free (GstRTSPTimeRange * range)
{
g_return_if_fail (range != NULL);
g_free (range);
}
static GstClockTime
get_seconds (const GstRTSPTime * t)
{
if (t->seconds < G_MAXINT) {
gint num, denom;
/* Don't do direct multiply with GST_SECOND to avoid rounding
* errors.
* This only works for "small" numbers, because num is limited to 32-bit
*/
gst_util_double_to_fraction (t->seconds, &num, &denom);
return gst_util_uint64_scale_int (GST_SECOND, num, denom);
} else {
return gst_util_gdouble_to_guint64 (t->seconds * GST_SECOND);
}
}
static GstClockTime
get_frames (const GstRTSPTime2 * t, GstRTSPRangeUnit unit)
{
gint num, denom;
gst_util_double_to_fraction (t->frames, &num, &denom);
switch (unit) {
case GST_RTSP_RANGE_SMPTE_25:
denom *= 25;
break;
case GST_RTSP_RANGE_SMPTE:
case GST_RTSP_RANGE_SMPTE_30_DROP:
default:
num *= 1001;
denom *= 30003;
break;
}
return gst_util_uint64_scale_int (GST_SECOND, num, denom);
}
static GstClockTime
get_time (GstRTSPRangeUnit unit, const GstRTSPTime * t1,
const GstRTSPTime2 * t2)
{
GstClockTime res;
switch (t1->type) {
case GST_RTSP_TIME_SECONDS:
{
res = get_seconds (t1);
break;
}
case GST_RTSP_TIME_UTC:
{
GDateTime *dt, *bt;
GTimeSpan span;
/* make time base, we use 1900 */
bt = g_date_time_new_utc (1900, 1, 1, 0, 0, 0.0);
/* convert to GDateTime without the seconds */
dt = g_date_time_new_utc (t2->year, t2->month, t2->day, 0, 0, 0.0);
/* get amount of microseconds */
span = g_date_time_difference (dt, bt);
g_date_time_unref (bt);
g_date_time_unref (dt);
/* add seconds */
res = get_seconds (t1) + (span * 1000);
break;
}
case GST_RTSP_TIME_FRAMES:
res = get_seconds (t1);
res += get_frames (t2, unit);
break;
default:
case GST_RTSP_TIME_NOW:
case GST_RTSP_TIME_END:
res = GST_CLOCK_TIME_NONE;
break;
}
return res;
}
/**
* gst_rtsp_range_get_times:
* @range: a #GstRTSPTimeRange
* @min: result minimum #GstClockTime
* @max: result maximum #GstClockTime
*
* Retrieve the minimum and maximum values from @range converted to
* #GstClockTime in @min and @max.
*
* A value of %GST_CLOCK_TIME_NONE will be used to signal #GST_RTSP_TIME_NOW
* and #GST_RTSP_TIME_END for @min and @max respectively.
*
* UTC times will be converted to nanoseconds since 1900.
*
* Returns: %TRUE on success.
*
* Since: 1.1.1
*/
gboolean
gst_rtsp_range_get_times (const GstRTSPTimeRange * range,
GstClockTime * min, GstClockTime * max)
{
g_return_val_if_fail (range != NULL, FALSE);
if (min)
*min = get_time (range->unit, &range->min, &range->min2);
if (max)
*max = get_time (range->unit, &range->max, &range->max2);
return TRUE;
}
static void
set_time (GstRTSPTime * time, GstRTSPTime2 * time2, GstRTSPRangeUnit unit,
GstClockTime clock_time)
{
memset (time, 0, sizeof (GstRTSPTime));
memset (time2, 0, sizeof (GstRTSPTime2));
if (clock_time == GST_CLOCK_TIME_NONE) {
time->type = GST_RTSP_TIME_END;
return;
}
switch (unit) {
case GST_RTSP_RANGE_SMPTE:
case GST_RTSP_RANGE_SMPTE_30_DROP:
{
time->seconds = (guint64) (clock_time / GST_SECOND);
time2->frames = 30003 * (clock_time % GST_SECOND) /
(gdouble) (1001 * GST_SECOND);
time->type = GST_RTSP_TIME_FRAMES;
g_assert (time2->frames < 30);
break;
}
case GST_RTSP_RANGE_SMPTE_25:
{
time->seconds = (guint64) (clock_time / GST_SECOND);
time2->frames = (25 * (clock_time % GST_SECOND)) / (gdouble) GST_SECOND;
time->type = GST_RTSP_TIME_FRAMES;
g_assert (time2->frames < 25);
break;
}
case GST_RTSP_RANGE_NPT:
{
time->seconds = (gdouble) clock_time / (gdouble) GST_SECOND;
time->type = GST_RTSP_TIME_SECONDS;
break;
}
case GST_RTSP_RANGE_CLOCK:
{
GDateTime *bt, *datetime;
GstClockTime subsecond = clock_time % GST_SECOND;
bt = g_date_time_new_utc (1900, 1, 1, 0, 0, 0.0);
datetime = g_date_time_add_seconds (bt, clock_time / GST_SECOND);
time2->year = g_date_time_get_year (datetime);
time2->month = g_date_time_get_month (datetime);
time2->day = g_date_time_get_day_of_month (datetime);
time->seconds = g_date_time_get_hour (datetime) * 60 * 60;
time->seconds += g_date_time_get_minute (datetime) * 60;
time->seconds += g_date_time_get_seconds (datetime);
time->seconds += (gdouble) subsecond / (gdouble) GST_SECOND;
time->type = GST_RTSP_TIME_UTC;
g_date_time_unref (bt);
g_date_time_unref (datetime);
break;
}
}
if (time->seconds < 0.000000001)
time->seconds = 0;
if (time2->frames < 0.000000001)
time2->frames = 0;
}
/**
* gst_rtsp_range_convert_units:
* @range: a #GstRTSPTimeRange
* @unit: the unit to convert the range into
*
* Converts the range in-place between different types of units.
* Ranges containing the special value #GST_RTSP_TIME_NOW can not be
* converted as these are only valid for #GST_RTSP_RANGE_NPT.
*
* Returns: %TRUE if the range could be converted
*/
gboolean
gst_rtsp_range_convert_units (GstRTSPTimeRange * range, GstRTSPRangeUnit unit)
{
if (range->unit == unit)
return TRUE;
if (range->min.type == GST_RTSP_TIME_NOW ||
range->max.type == GST_RTSP_TIME_NOW)
return FALSE;
set_time (&range->min, &range->min2, unit,
get_time (range->unit, &range->min, &range->min2));
set_time (&range->max, &range->max2, unit,
get_time (range->unit, &range->max, &range->max2));
range->unit = unit;
return TRUE;
}
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