4bf90e095b
To make it consistent with other muxers. The user can still control the generic flushing behaviour after write_header (same way as after packets) using the -flush_packets option, the default typically means to flush unless a non-streamed file output is used. Therefore this change should have no adverse effect on streaming, even if it is assumed that the first packet has a clean buffer, so small seekbacks within the output buffer work even when the IO context is not seekable. Signed-off-by: Marton Balint <cus@passwd.hu>
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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* Metadata muxer
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* Copyright (c) 2010 Anton Khirnov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "avformat.h"
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#include "ffmeta.h"
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#include "libavutil/dict.h"
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static void write_escape_str(AVIOContext *s, const uint8_t *str)
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{
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const uint8_t *p = str;
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while (*p) {
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if (*p == '#' || *p == ';' || *p == '=' || *p == '\\' || *p == '\n')
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avio_w8(s, '\\');
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avio_w8(s, *p);
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p++;
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}
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}
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static void write_tags(AVIOContext *s, AVDictionary *m)
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{
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AVDictionaryEntry *t = NULL;
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while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX))) {
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write_escape_str(s, t->key);
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avio_w8(s, '=');
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write_escape_str(s, t->value);
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avio_w8(s, '\n');
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}
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}
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static int write_header(AVFormatContext *s)
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{
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avio_write(s->pb, ID_STRING, sizeof(ID_STRING) - 1);
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avio_w8(s->pb, '1'); // version
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avio_w8(s->pb, '\n');
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return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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int i;
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write_tags(s->pb, s->metadata);
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for (i = 0; i < s->nb_streams; i++) {
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avio_write(s->pb, ID_STREAM, sizeof(ID_STREAM) - 1);
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avio_w8(s->pb, '\n');
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write_tags(s->pb, s->streams[i]->metadata);
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}
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for (i = 0; i < s->nb_chapters; i++) {
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AVChapter *ch = s->chapters[i];
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avio_write(s->pb, ID_CHAPTER, sizeof(ID_CHAPTER) - 1);
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avio_w8(s->pb, '\n');
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avio_printf(s->pb, "TIMEBASE=%d/%d\n", ch->time_base.num, ch->time_base.den);
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avio_printf(s->pb, "START=%"PRId64"\n", ch->start);
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avio_printf(s->pb, "END=%"PRId64"\n", ch->end);
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write_tags(s->pb, ch->metadata);
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}
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return 0;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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return 0;
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}
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AVOutputFormat ff_ffmetadata_muxer = {
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.name = "ffmetadata",
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.long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"),
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.extensions = "ffmeta",
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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.flags = AVFMT_NOTIMESTAMPS | AVFMT_NOSTREAMS,
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};
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