2 * Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
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44 * SECTION:gstrtsprange
45 * @short_description: dealing with time ranges
47 * Provides helper functions to deal with time ranges.
49 * Last reviewed on 2007-07-25 (0.10.14)
56 #include "gstrtsprange.h"
59 gst_strtod (const gchar * dstr)
61 gchar s[G_ASCII_DTOSTR_BUF_SIZE] = { 0, };
63 /* canonicalise floating point string so we can handle float strings
64 * in the form "24.930" or "24,930" irrespective of the current locale.
65 * We should always be getting floats in 24.930 format with a floating point,
66 * but let's accept malformed ones as well, easy mistake to make after all */
67 g_strlcpy (s, dstr, sizeof (s));
68 g_strdelimit (s, ",", '.');
69 return g_ascii_strtod (s, NULL);
72 /* npt-time = "now" | npt-sec | npt-hhmmss
73 * npt-sec = 1*DIGIT [ "." *DIGIT ]
74 * npt-hhmmss = npt-hh ":" npt-mm ":" npt-ss [ "." *DIGIT ]
75 * npt-hh = 1*DIGIT ; any positive number
76 * npt-mm = 1*2DIGIT ; 0-59
77 * npt-ss = 1*2DIGIT ; 0-59
80 parse_npt_time (const gchar * str, GstRTSPTime * time)
82 if (strncmp (str, "now", 3) == 0) {
83 time->type = GST_RTSP_TIME_NOW;
84 } else if (str[0] == '\0' || str[0] == '-') {
85 time->type = GST_RTSP_TIME_END;
86 } else if (strstr (str, ":")) {
89 if (sscanf (str, "%2d:%2d:", &hours, &mins) != 2)
90 return GST_RTSP_EINVAL;
92 str = strchr (str, ':');
93 str = strchr (str + 1, ':');
95 return GST_RTSP_EINVAL;
97 time->type = GST_RTSP_TIME_SECONDS;
98 time->seconds = ((hours * 60) + mins) * 60 + gst_strtod (str + 1);
100 time->type = GST_RTSP_TIME_SECONDS;
101 time->seconds = gst_strtod (str);
106 /* npt-range = ( npt-time "-" [ npt-time ] ) | ( "-" npt-time )
109 parse_npt_range (const gchar * str, GstRTSPTimeRange * range)
114 range->unit = GST_RTSP_RANGE_NPT;
116 /* find '-' separator */
117 p = strstr (str, "-");
119 return GST_RTSP_EINVAL;
121 if ((res = parse_npt_time (str, &range->min)) != GST_RTSP_OK)
124 res = parse_npt_time (p + 1, &range->max);
126 /* a single - is not allowed */
127 if (range->min.type == GST_RTSP_TIME_END
128 && range->max.type == GST_RTSP_TIME_END)
129 return GST_RTSP_EINVAL;
137 parse_clock_range (const gchar * str, GstRTSPTimeRange * range)
139 return GST_RTSP_ENOTIMPL;
142 /* smpte-time = 1*2DIGIT ":" 1*2DIGIT ":" 1*2DIGIT [ ":" 1*2DIGIT ]
144 * hours:minutes:seconds:frames.subframes
147 parse_smpte_time (const gchar * str, GstRTSPTime * time, const gchar * limit)
149 gint hours, mins, secs;
151 if (str[0] == '\0') {
152 time->type = GST_RTSP_TIME_END;
155 if (sscanf (str, "%02d:%2d:%02d", &hours, &mins, &secs) != 3)
156 return GST_RTSP_EINVAL;
158 time->type = GST_RTSP_TIME_FRAMES;
159 time->seconds = ((hours * 60) + mins) * 60 + secs;
160 str = strchr (str, ':');
161 str = strchr (str + 1, ':');
162 str = strchr (str + 1, ':');
163 if (str && (limit == NULL || str < limit))
164 time->frames = gst_strtod (str + 1);
169 /* smpte-range = smpte-type "=" smpte-time "-" [ smpte-time ]
172 parse_smpte_range (const gchar * str, GstRTSPTimeRange * range)
177 range->unit = GST_RTSP_RANGE_SMPTE;
179 /* find '-' separator, can't have a single - */
180 p = strstr (str, "-");
181 if (p == NULL || p == str)
182 return GST_RTSP_EINVAL;
184 if ((res = parse_smpte_time (str, &range->min, p)) != GST_RTSP_OK)
187 res = parse_smpte_time (p + 1, &range->max, NULL);
194 * gst_rtsp_range_parse:
195 * @rangestr: a range string to parse
196 * @range: location to hold the #GstRTSPTimeRange result
198 * Parse @rangestr to a #GstRTSPTimeRange.
200 * Returns: #GST_RTSP_OK on success.
203 gst_rtsp_range_parse (const gchar * rangestr, GstRTSPTimeRange ** range)
206 GstRTSPTimeRange *res;
209 g_return_val_if_fail (rangestr != NULL, GST_RTSP_EINVAL);
210 g_return_val_if_fail (range != NULL, GST_RTSP_EINVAL);
212 res = g_new0 (GstRTSPTimeRange, 1);
214 p = (gchar *) rangestr;
215 /* first figure out the units of the range */
216 if (g_str_has_prefix (p, "npt=")) {
217 ret = parse_npt_range (p + 4, res);
218 } else if (g_str_has_prefix (p, "clock=")) {
219 ret = parse_clock_range (p + 6, res);
220 } else if (g_str_has_prefix (p, "smpte=")) {
221 res->unit = GST_RTSP_RANGE_SMPTE;
222 ret = parse_smpte_range (p + 6, res);
223 } else if (g_str_has_prefix (p, "smpte-30-drop=")) {
224 res->unit = GST_RTSP_RANGE_SMPTE_30_DROP;
225 ret = parse_smpte_range (p + 14, res);
226 } else if (g_str_has_prefix (p, "smpte-25=")) {
227 res->unit = GST_RTSP_RANGE_SMPTE_25;
228 ret = parse_smpte_range (p + 9, res);
232 if (ret != GST_RTSP_OK)
241 gst_rtsp_range_free (res);
242 return GST_RTSP_EINVAL;
247 npt_time_string (const GstRTSPTime * time, GString * string)
249 gchar dstrbuf[G_ASCII_DTOSTR_BUF_SIZE] = { 0, };
250 gboolean res = TRUE;;
252 switch (time->type) {
253 case GST_RTSP_TIME_SECONDS:
254 /* need to format floating point value strings as in C locale */
255 g_ascii_dtostr (dstrbuf, G_ASCII_DTOSTR_BUF_SIZE, time->seconds);
256 g_string_append (string, dstrbuf);
258 case GST_RTSP_TIME_NOW:
259 g_string_append (string, "now");
261 case GST_RTSP_TIME_END:
271 npt_range_string (const GstRTSPTimeRange * range, GString * string)
275 if (!(res = npt_time_string (&range->min, string)))
278 g_string_append (string, "-");
280 if (!(res = npt_time_string (&range->max, string)))
288 * gst_rtsp_range_to_string:
289 * @range: a #GstRTSPTimeRange
291 * Convert @range into a string representation.
293 * Returns: The string representation of @range. g_free() after usage.
296 gst_rtsp_range_to_string (const GstRTSPTimeRange * range)
298 gchar *result = NULL;
301 g_return_val_if_fail (range != NULL, NULL);
303 string = g_string_new ("");
305 switch (range->unit) {
306 case GST_RTSP_RANGE_NPT:
307 g_string_append (string, "npt=");
308 if (!npt_range_string (range, string)) {
309 g_string_free (string, TRUE);
313 case GST_RTSP_RANGE_SMPTE:
314 case GST_RTSP_RANGE_SMPTE_30_DROP:
315 case GST_RTSP_RANGE_SMPTE_25:
316 case GST_RTSP_RANGE_CLOCK:
318 g_warning ("time range unit not yet implemented");
319 g_string_free (string, TRUE);
324 result = g_string_free (string, FALSE);
330 * gst_rtsp_range_free:
331 * @range: a #GstRTSPTimeRange
333 * Free the memory allocated by @range.
336 gst_rtsp_range_free (GstRTSPTimeRange * range)