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270 lines
7 KiB
C
270 lines
7 KiB
C
/* GStreamer
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* Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Unless otherwise indicated, Source Code is licensed under MIT license.
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* See further explanation attached in License Statement (distributed in the file
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* LICENSE).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/**
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* SECTION:gstrtsprange
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* @short_description: dealing with time ranges
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*
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* Provides helper functions to deal with time ranges.
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*
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* Last reviewed on 2007-07-25 (0.10.14)
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*/
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#include <stdio.h>
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#include <string.h>
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#include "gstrtsprange.h"
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/* npt-time = "now" | npt-sec | npt-hhmmss
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* npt-sec = 1*DIGIT [ "." *DIGIT ]
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* npt-hhmmss = npt-hh ":" npt-mm ":" npt-ss [ "." *DIGIT ]
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* npt-hh = 1*DIGIT ; any positive number
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* npt-mm = 1*2DIGIT ; 0-59
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* npt-ss = 1*2DIGIT ; 0-59
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*/
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static GstRTSPResult
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parse_npt_time (const gchar * str, GstRTSPTime * time)
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{
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if (strncmp (str, "now", 3) == 0) {
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time->type = GST_RTSP_TIME_NOW;
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} else if (str[0] == '\0') {
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time->type = GST_RTSP_TIME_END;
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} else if (strstr (str, ":")) {
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gfloat seconds;
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gint hours, mins;
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sscanf (str, "%2d:%2d:%f", &hours, &mins, &seconds);
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time->type = GST_RTSP_TIME_SECONDS;
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time->seconds = ((hours * 60) + mins) * 60 + seconds;
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} else {
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gfloat seconds;
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sscanf (str, "%f", &seconds);
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time->type = GST_RTSP_TIME_SECONDS;
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time->seconds = seconds;
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}
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return GST_RTSP_OK;
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}
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/* npt-range = ( npt-time "-" [ npt-time ] ) | ( "-" npt-time )
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*/
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static GstRTSPResult
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parse_npt_range (const gchar * str, GstRTSPTimeRange * range)
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{
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GstRTSPResult res;
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gchar *p;
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range->unit = GST_RTSP_RANGE_NPT;
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/* find '-' separator */
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p = strstr (str, "-");
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if (p == NULL)
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return GST_RTSP_EINVAL;
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if ((res = parse_npt_time (str, &range->min)) != GST_RTSP_OK)
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goto done;
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res = parse_npt_time (p + 1, &range->max);
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done:
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return res;
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}
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static GstRTSPResult
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parse_clock_range (const gchar * str, GstRTSPTimeRange * range)
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{
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return GST_RTSP_ENOTIMPL;
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}
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static GstRTSPResult
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parse_smpte_range (const gchar * str, GstRTSPTimeRange * range)
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{
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return GST_RTSP_ENOTIMPL;
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}
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/**
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* gst_rtsp_range_parse:
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* @rangestr: a range string to parse
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* @range: location to hold the #GstRTSPTimeRange result
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*
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* Parse @rangestr to a #GstRTSPTimeRange.
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*
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* Returns: #GST_RTSP_OK on success.
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*/
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GstRTSPResult
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gst_rtsp_range_parse (const gchar * rangestr, GstRTSPTimeRange ** range)
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{
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GstRTSPResult ret;
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GstRTSPTimeRange *res;
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gchar *p;
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g_return_val_if_fail (rangestr != NULL, GST_RTSP_EINVAL);
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g_return_val_if_fail (range != NULL, GST_RTSP_EINVAL);
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res = g_new0 (GstRTSPTimeRange, 1);
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p = (gchar *) rangestr;
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/* first figure out the units of the range */
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if (g_str_has_prefix (p, "npt=")) {
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ret = parse_npt_range (p + 4, res);
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} else if (g_str_has_prefix (p, "clock=")) {
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ret = parse_clock_range (p + 6, res);
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} else if (g_str_has_prefix (p, "smpte=")) {
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res->unit = GST_RTSP_RANGE_SMPTE;
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ret = parse_smpte_range (p + 6, res);
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} else if (g_str_has_prefix (p, "smpte-30-drop=")) {
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res->unit = GST_RTSP_RANGE_SMPTE_30_DROP;
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ret = parse_smpte_range (p + 14, res);
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} else if (g_str_has_prefix (p, "smpte-25=")) {
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res->unit = GST_RTSP_RANGE_SMPTE_25;
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ret = parse_smpte_range (p + 9, res);
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} else
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goto invalid;
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if (ret != GST_RTSP_OK)
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goto invalid;
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*range = res;
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return ret;
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/* ERRORS */
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invalid:
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{
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gst_rtsp_range_free (res);
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return GST_RTSP_EINVAL;
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}
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}
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static gboolean
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npt_time_string (const GstRTSPTime * time, GString * string)
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{
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gboolean res = TRUE;;
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switch (time->type) {
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case GST_RTSP_TIME_SECONDS:
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g_string_append_printf (string, "%f", time->seconds);
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break;
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case GST_RTSP_TIME_NOW:
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g_string_append (string, "now");
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break;
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case GST_RTSP_TIME_END:
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break;
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default:
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res = FALSE;
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break;
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}
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return res;
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}
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static gboolean
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npt_range_string (const GstRTSPTimeRange * range, GString * string)
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{
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gboolean res;
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if (!(res = npt_time_string (&range->min, string)))
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goto done;
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g_string_append (string, "-");
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if (!(res = npt_time_string (&range->max, string)))
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goto done;
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done:
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return res;
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}
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/**
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* gst_rtsp_range_to_string:
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* @range: a #GstRTSPTimeRange
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*
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* Convert @range into a string representation.
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*
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* Returns: The string representation of @range. g_free() after usage.
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*/
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gchar *
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gst_rtsp_range_to_string (const GstRTSPTimeRange * range)
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{
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gchar *result = NULL;
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GString *string;
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g_return_val_if_fail (range != NULL, NULL);
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string = g_string_new ("");
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switch (range->unit) {
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case GST_RTSP_RANGE_NPT:
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g_string_append (string, "npt=");
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if (!npt_range_string (range, string)) {
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g_string_free (string, TRUE);
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string = NULL;
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}
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break;
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case GST_RTSP_RANGE_SMPTE:
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case GST_RTSP_RANGE_SMPTE_30_DROP:
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case GST_RTSP_RANGE_SMPTE_25:
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case GST_RTSP_RANGE_CLOCK:
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default:
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g_warning ("time range unit not yet implemented");
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g_string_free (string, TRUE);
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string = NULL;
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break;
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}
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if (string)
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result = g_string_free (string, FALSE);
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return result;
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}
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/**
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* gst_rtsp_range_free:
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* @range: a #GstRTSPTimeRange
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*
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* Free the memory allocated by @range.
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*/
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void
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gst_rtsp_range_free (GstRTSPTimeRange * range)
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{
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g_free (range);
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}
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