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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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388 lines
9.3 KiB
C
388 lines
9.3 KiB
C
/*
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* gstcmmlutils.c - GStreamer CMML utility functions
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* Copyright (C) 2005 Alessandro Decina
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*
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* Authors:
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* Alessandro Decina <alessandro@nnva.org>
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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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#include "gstcmmlutils.h"
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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typedef struct
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{
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GList *clips;
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gpointer user_data;
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} GstCmmlTrack;
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GstClockTime
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gst_cmml_clock_time_from_npt (const gchar * time)
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{
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GstClockTime res;
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gint fields;
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gint hours = 0;
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gint minutes = 0;
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gint seconds = 0;
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gint mseconds = 0;
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GstClockTime hours_t = 0, seconds_t = 0;
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if (!strncmp (time, "npt:", 4))
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time += 4;
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/* parse npt-hhmmss */
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fields = sscanf (time, "%d:%d:%d.%d", &hours, &minutes, &seconds, &mseconds);
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if (fields == 4) {
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if (hours < 0 || (guint) minutes > 59 || (guint) seconds > 59)
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goto bad_input;
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hours_t = gst_util_uint64_scale (hours, GST_SECOND * 3600, 1);
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if (hours_t == G_MAXUINT64)
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goto overflow;
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seconds_t = seconds * GST_SECOND;
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} else {
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guint64 u64seconds;
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/* parse npt-sec */
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hours_t = 0;
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minutes = 0;
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fields = sscanf (time, "%" G_GUINT64_FORMAT ".%d", &u64seconds, &mseconds);
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if (seconds < 0)
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goto bad_input;
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seconds_t = gst_util_uint64_scale_int (u64seconds, GST_SECOND, 1);
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if (seconds_t == G_MAXUINT64)
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goto overflow;
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}
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if ((guint) mseconds > 999)
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goto bad_input;
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res = (minutes * 60) * GST_SECOND + mseconds * GST_MSECOND;
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if (G_MAXUINT64 - hours_t - seconds_t < res)
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goto overflow;
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res += hours_t + seconds_t;
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return res;
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bad_input:
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overflow:
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return GST_CLOCK_TIME_NONE;
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}
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GstClockTime
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gst_cmml_clock_time_from_smpte (const gchar * time)
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{
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GstClockTime res;
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GstClockTime hours_t;
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gint hours, minutes, seconds;
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gdouble framerate;
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gfloat frames;
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gint fields;
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if (!strncmp (time, "smpte-24:", 9)) {
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framerate = 24.0;
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time += 9;
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} else if (!strncmp (time, "smpte-24-drop:", 14)) {
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framerate = 23.976;
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time += 14;
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} else if (!strncmp (time, "smpte-25:", 9)) {
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framerate = 25.0;
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time += 9;
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} else if (!strncmp (time, "smpte-30:", 9)) {
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framerate = 30.0;
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time += 9;
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} else if (!strncmp (time, "smpte-30-drop:", 14)) {
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framerate = 29.976;
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time += 14;
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} else if (!strncmp (time, "smpte-50:", 9)) {
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framerate = 50.0;
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time += 9;
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} else if (!strncmp (time, "smpte-60:", 9)) {
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framerate = 60.0;
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time += 9;
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} else if (!strncmp (time, "smpte-60-drop:", 14)) {
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framerate = 59.94;
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time += 14;
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} else {
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return GST_CLOCK_TIME_NONE;
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}
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fields = sscanf (time, "%d:%d:%d:%f", &hours, &minutes, &seconds, &frames);
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if (fields == 4) {
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if (hours < 0 || (guint) minutes > 59 || (guint) seconds > 59 ||
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frames < 0 || frames > ceil (framerate)) {
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res = GST_CLOCK_TIME_NONE;
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} else {
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hours_t = gst_util_uint64_scale (hours, GST_SECOND * 3600, 1);
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if (hours_t == G_MAXUINT64)
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goto overflow;
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res = ((minutes * 60) + seconds + (frames / framerate))
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* GST_SECOND;
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if (G_MAXUINT64 - hours_t < res)
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goto overflow;
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res = hours_t + res;
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}
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} else {
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res = GST_CLOCK_TIME_NONE;
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}
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return res;
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overflow:
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return GST_CLOCK_TIME_NONE;
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}
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gchar *
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gst_cmml_clock_time_to_npt (const GstClockTime time)
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{
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guint seconds, hours, minutes, mseconds;
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gchar *res;
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g_return_val_if_fail (time != GST_CLOCK_TIME_NONE, NULL);
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hours = time / (GST_SECOND * 3600);
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minutes = (time / ((GST_SECOND * 60)) % 60);
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seconds = (time / GST_SECOND) % 60;
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mseconds = (time % GST_SECOND) / GST_MSECOND;
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if (mseconds < 100)
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mseconds *= 10;
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res = g_strdup_printf ("%u:%02u:%02u.%03u",
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hours, minutes, seconds, mseconds);
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return res;
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}
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gint64
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gst_cmml_clock_time_to_granule (GstClockTime prev_time,
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GstClockTime current_time, gint64 granulerate_n, gint64 granulerate_d,
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guint8 granuleshift)
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{
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guint64 keyindex, keyoffset, granulepos, maxoffset;
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gint64 granulerate;
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g_return_val_if_fail (granulerate_d != 0, -1);
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g_return_val_if_fail (granuleshift > 0, -1);
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g_return_val_if_fail (granuleshift <= 64, -1);
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if (prev_time == GST_CLOCK_TIME_NONE)
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prev_time = 0;
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if (prev_time > current_time)
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return -1;
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/* GST_SECOND / (granulerate_n / granulerate_d) */
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granulerate = gst_util_uint64_scale (GST_SECOND,
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granulerate_d, granulerate_n);
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prev_time = prev_time / granulerate;
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/* granuleshift == 64 should be a << 0 shift, which is defined */
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maxoffset = ((guint64) 1 << (64 - granuleshift)) - 1;
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if (prev_time > maxoffset)
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/* we need more than 64 - granuleshift bits to encode prev_time */
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goto overflow;
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keyindex = prev_time << granuleshift;
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keyoffset = (current_time / granulerate) - prev_time;
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/* make sure we don't shift to the limits of the types as this is undefined. */
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if (granuleshift == 64)
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maxoffset = G_MAXUINT64;
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else
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maxoffset = ((guint64) 1 << granuleshift) - 1;
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if (keyoffset > maxoffset)
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/* we need more than granuleshift bits to encode prev_time - current_time */
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goto overflow;
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granulepos = keyindex + keyoffset;
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return granulepos;
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overflow:
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return -1;
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}
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/* track list */
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GHashTable *
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gst_cmml_track_list_new (void)
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{
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return g_hash_table_new (g_str_hash, g_str_equal);
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}
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static gboolean
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gst_cmml_track_list_destroy_track (gchar * key,
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GstCmmlTrack * track, gpointer user_data)
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{
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GList *walk;
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for (walk = track->clips; walk; walk = g_list_next (walk))
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g_object_unref (G_OBJECT (walk->data));
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g_free (key);
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g_list_free (track->clips);
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g_free (track);
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return TRUE;
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}
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void
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gst_cmml_track_list_destroy (GHashTable * tracks)
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{
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g_hash_table_foreach_remove (tracks,
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(GHRFunc) gst_cmml_track_list_destroy_track, NULL);
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g_hash_table_destroy (tracks);
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}
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static gint
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gst_cmml_track_list_compare_clips (GstCmmlTagClip * a, GstCmmlTagClip * b)
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{
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if (a->start_time < b->start_time)
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return -1;
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return 1;
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}
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void
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gst_cmml_track_list_add_clip (GHashTable * tracks, GstCmmlTagClip * clip)
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{
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gpointer key, value;
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GstCmmlTrack *track;
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gchar *track_name;
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g_return_if_fail (clip->track != NULL);
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if (g_hash_table_lookup_extended (tracks, clip->track, &key, &value)) {
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track_name = (gchar *) key;
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track = (GstCmmlTrack *) value;
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} else {
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track_name = g_strdup ((gchar *) clip->track);
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track = g_new0 (GstCmmlTrack, 1);
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g_hash_table_insert (tracks, track_name, track);
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}
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/* add clip to the tracklist */
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track->clips = g_list_insert_sorted (track->clips, g_object_ref (clip),
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(GCompareFunc) gst_cmml_track_list_compare_clips);
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}
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gboolean
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gst_cmml_track_list_del_clip (GHashTable * tracks, GstCmmlTagClip * clip)
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{
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GstCmmlTrack *track;
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GList *link;
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gboolean res = FALSE;
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g_return_val_if_fail (clip->track != NULL, FALSE);
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track = g_hash_table_lookup (tracks, clip->track);
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if (track) {
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link = g_list_find (track->clips, clip);
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if (link) {
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g_object_unref (G_OBJECT (link->data));
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track->clips = g_list_delete_link (track->clips, link);
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res = TRUE;
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}
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}
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return res;
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}
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gboolean
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gst_cmml_track_list_has_clip (GHashTable * tracks, GstCmmlTagClip * clip)
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{
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GstCmmlTrack *track;
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GList *walk;
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GstCmmlTagClip *tmp;
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gboolean res = FALSE;
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track = g_hash_table_lookup (tracks, (gchar *) clip->track);
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if (track) {
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for (walk = track->clips; walk; walk = g_list_next (walk)) {
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tmp = GST_CMML_TAG_CLIP (walk->data);
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if (tmp->start_time == clip->start_time) {
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res = TRUE;
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break;
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}
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}
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}
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return res;
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}
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static gboolean
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gst_cmml_track_list_merge_track (gchar * track_name,
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GstCmmlTrack * track, GList ** list)
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{
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GList *walk;
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GstCmmlTagClip *cur;
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for (walk = track->clips; walk; walk = g_list_next (walk)) {
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cur = GST_CMML_TAG_CLIP (walk->data);
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*list = g_list_insert_sorted (*list, cur,
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(GCompareFunc) gst_cmml_track_list_compare_clips);
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}
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return TRUE;
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}
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GList *
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gst_cmml_track_list_get_track_clips (GHashTable * tracks,
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const gchar * track_name)
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{
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GstCmmlTrack *track;
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g_return_val_if_fail (track_name != NULL, NULL);
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track = g_hash_table_lookup (tracks, track_name);
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return track ? track->clips : NULL;
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}
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GList *
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gst_cmml_track_list_get_clips (GHashTable * tracks)
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{
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GList *list = NULL;
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g_hash_table_foreach (tracks,
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(GHFunc) gst_cmml_track_list_merge_track, &list);
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return list;
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}
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GstCmmlTagClip *
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gst_cmml_track_list_get_track_last_clip (GHashTable * tracks,
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const gchar * track_name)
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{
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GstCmmlTrack *track;
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GList *res = NULL;
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g_return_val_if_fail (track_name != NULL, NULL);
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track = g_hash_table_lookup (tracks, track_name);
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if (track && track->clips)
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res = g_list_last (track->clips);
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return res ? GST_CMML_TAG_CLIP (res->data) : NULL;
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}
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