mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 15:08:23 -05:00
158 lines
6.2 KiB
C
Executable File
158 lines
6.2 KiB
C
Executable File
/*
|
|
* MPEG-DASH ISO BMFF segmenter
|
|
* Copyright (c) 2014 Martin Storsjo
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/rational.h"
|
|
#include "libavutil/time_internal.h"
|
|
|
|
#include "avc.h"
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "internal.h"
|
|
#include "isom.h"
|
|
#include "os_support.h"
|
|
#include "url.h"
|
|
#include "dash.h"
|
|
|
|
static DASHTmplId dash_read_tmpl_id(const char *identifier, char *format_tag,
|
|
size_t format_tag_size, const char **ptr) {
|
|
const char *next_ptr;
|
|
DASHTmplId id_type = DASH_TMPL_ID_UNDEFINED;
|
|
|
|
if (av_strstart(identifier, "$$", &next_ptr)) {
|
|
id_type = DASH_TMPL_ID_ESCAPE;
|
|
*ptr = next_ptr;
|
|
} else if (av_strstart(identifier, "$RepresentationID$", &next_ptr)) {
|
|
id_type = DASH_TMPL_ID_REP_ID;
|
|
// default to basic format, as $RepresentationID$ identifiers
|
|
// are not allowed to have custom format-tags.
|
|
av_strlcpy(format_tag, "%d", format_tag_size);
|
|
*ptr = next_ptr;
|
|
} else { // the following identifiers may have an explicit format_tag
|
|
if (av_strstart(identifier, "$Number", &next_ptr))
|
|
id_type = DASH_TMPL_ID_NUMBER;
|
|
else if (av_strstart(identifier, "$Bandwidth", &next_ptr))
|
|
id_type = DASH_TMPL_ID_BANDWIDTH;
|
|
else if (av_strstart(identifier, "$Time", &next_ptr))
|
|
id_type = DASH_TMPL_ID_TIME;
|
|
else
|
|
id_type = DASH_TMPL_ID_UNDEFINED;
|
|
|
|
// next parse the dash format-tag and generate a c-string format tag
|
|
// (next_ptr now points at the first '%' at the beginning of the format-tag)
|
|
if (id_type != DASH_TMPL_ID_UNDEFINED) {
|
|
const char *number_format = (id_type == DASH_TMPL_ID_TIME) ? PRId64 : "d";
|
|
if (next_ptr[0] == '$') { // no dash format-tag
|
|
snprintf(format_tag, format_tag_size, "%%%s", number_format);
|
|
*ptr = &next_ptr[1];
|
|
} else {
|
|
const char *width_ptr;
|
|
// only tolerate single-digit width-field (i.e. up to 9-digit width)
|
|
if (av_strstart(next_ptr, "%0", &width_ptr) &&
|
|
av_isdigit(width_ptr[0]) &&
|
|
av_strstart(&width_ptr[1], "d$", &next_ptr)) {
|
|
// yes, we're using a format tag to build format_tag.
|
|
snprintf(format_tag, format_tag_size, "%s%c%s", "%0", width_ptr[0], number_format);
|
|
*ptr = next_ptr;
|
|
} else {
|
|
av_log(NULL, AV_LOG_WARNING, "Failed to parse format-tag beginning with %s. Expected either a "
|
|
"closing '$' character or a format-string like '%%0[width]d', "
|
|
"where width must be a single digit\n", next_ptr);
|
|
id_type = DASH_TMPL_ID_UNDEFINED;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return id_type;
|
|
}
|
|
|
|
void ff_dash_fill_tmpl_params(char *dst, size_t buffer_size,
|
|
const char *template, int rep_id,
|
|
int number, int bit_rate,
|
|
int64_t time) {
|
|
int dst_pos = 0;
|
|
const char *t_cur = template;
|
|
while (dst_pos < buffer_size - 1 && *t_cur) {
|
|
char format_tag[7]; // May be "%d", "%0Xd", or "%0Xlld" (for $Time$), where X is in [0-9]
|
|
int n = 0;
|
|
DASHTmplId id_type;
|
|
const char *t_next = strchr(t_cur, '$'); // copy over everything up to the first '$' character
|
|
if (t_next) {
|
|
int num_copy_bytes = FFMIN(t_next - t_cur, buffer_size - dst_pos - 1);
|
|
av_strlcpy(&dst[dst_pos], t_cur, num_copy_bytes + 1);
|
|
// advance
|
|
dst_pos += num_copy_bytes;
|
|
t_cur = t_next;
|
|
} else { // no more DASH identifiers to substitute - just copy the rest over and break
|
|
av_strlcpy(&dst[dst_pos], t_cur, buffer_size - dst_pos);
|
|
break;
|
|
}
|
|
|
|
if (dst_pos >= buffer_size - 1 || !*t_cur)
|
|
break;
|
|
|
|
// t_cur is now pointing to a '$' character
|
|
id_type = dash_read_tmpl_id(t_cur, format_tag, sizeof(format_tag), &t_next);
|
|
switch (id_type) {
|
|
case DASH_TMPL_ID_ESCAPE:
|
|
av_strlcpy(&dst[dst_pos], "$", 2);
|
|
n = 1;
|
|
break;
|
|
case DASH_TMPL_ID_REP_ID:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, rep_id);
|
|
break;
|
|
case DASH_TMPL_ID_NUMBER:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, number);
|
|
break;
|
|
case DASH_TMPL_ID_BANDWIDTH:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, bit_rate);
|
|
break;
|
|
case DASH_TMPL_ID_TIME:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, time);
|
|
break;
|
|
case DASH_TMPL_ID_UNDEFINED:
|
|
// copy over one byte and advance
|
|
av_strlcpy(&dst[dst_pos], t_cur, 2);
|
|
n = 1;
|
|
t_next = &t_cur[1];
|
|
break;
|
|
}
|
|
// t_next points just past the processed identifier
|
|
// n is the number of bytes that were attempted to be written to dst
|
|
// (may have failed to write all because buffer_size).
|
|
|
|
// advance
|
|
dst_pos += FFMIN(n, buffer_size - dst_pos - 1);
|
|
t_cur = t_next;
|
|
}
|
|
}
|
|
|
|
|