mirror of https://git.videolan.org/git/ffmpeg.git
136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
/*
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* LRC lyrics file format muxer
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* Copyright (c) 2014 StarBrilliant <m13253@hotmail.com>
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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 <stdint.h>
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#include <string.h>
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#include "avformat.h"
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#include "internal.h"
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#include "lrc.h"
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#include "metadata.h"
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#include "mux.h"
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#include "version.h"
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#include "libavutil/dict.h"
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#include "libavutil/log.h"
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#include "libavutil/macros.h"
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static int lrc_write_header(AVFormatContext *s)
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{
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const AVDictionaryEntry *metadata_item;
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if(s->streams[0]->codecpar->codec_id != AV_CODEC_ID_SUBRIP &&
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s->streams[0]->codecpar->codec_id != AV_CODEC_ID_TEXT) {
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av_log(s, AV_LOG_ERROR, "Unsupported subtitle codec: %s\n",
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avcodec_get_name(s->streams[0]->codecpar->codec_id));
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return AVERROR(EINVAL);
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}
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avpriv_set_pts_info(s->streams[0], 64, 1, 100);
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ff_standardize_creation_time(s);
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ff_metadata_conv_ctx(s, ff_lrc_metadata_conv, NULL);
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if(!(s->flags & AVFMT_FLAG_BITEXACT)) { // avoid breaking regression tests
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/* LRC provides a metadata slot for specifying encoder version
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* in addition to encoder name. We will store LIBAVFORMAT_VERSION
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* to it.
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*/
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av_dict_set(&s->metadata, "ve", AV_STRINGIFY(LIBAVFORMAT_VERSION), 0);
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} else {
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av_dict_set(&s->metadata, "ve", NULL, 0);
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}
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for(metadata_item = NULL;
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(metadata_item = av_dict_iterate(s->metadata, metadata_item));) {
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char *delim;
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if(!metadata_item->value[0]) {
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continue;
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}
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while((delim = strchr(metadata_item->value, '\n'))) {
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*delim = ' ';
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}
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while((delim = strchr(metadata_item->value, '\r'))) {
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*delim = ' ';
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}
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avio_printf(s->pb, "[%s:%s]\n",
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metadata_item->key, metadata_item->value);
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}
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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 lrc_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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if(pkt->pts != AV_NOPTS_VALUE) {
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const uint8_t *line = pkt->data;
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const uint8_t *end = pkt->data + pkt->size;
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while (end > line && (end[-1] == '\n' || end[-1] == '\r'))
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end--;
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if (line != end) {
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while (line[0] == '\n' || line[0] == '\r')
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line++; // Skip first empty lines
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}
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while(line) {
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const uint8_t *next_line = memchr(line, '\n', end - line);
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size_t size = end - line;
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if (next_line) {
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size = next_line - line;
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if (next_line > line && next_line[-1] == '\r')
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size--;
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next_line++;
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}
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if (size && line[0] == '[') {
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av_log(s, AV_LOG_WARNING,
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"Subtitle starts with '[', may cause problems with LRC format.\n");
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}
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/* Offset feature of LRC can easily make pts negative,
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* we just output it directly and let the player drop it. */
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avio_write(s->pb, "[-", 1 + (pkt->pts < 0));
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avio_printf(s->pb, "%02"PRIu64":%02"PRIu64".%02"PRIu64"]",
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(FFABS64U(pkt->pts) / 6000),
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((FFABS64U(pkt->pts) / 100) % 60),
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(FFABS64U(pkt->pts) % 100));
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avio_write(s->pb, line, size);
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avio_w8(s->pb, '\n');
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line = next_line;
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}
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}
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return 0;
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}
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const FFOutputFormat ff_lrc_muxer = {
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.p.name = "lrc",
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.p.long_name = NULL_IF_CONFIG_SMALL("LRC lyrics"),
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.p.extensions = "lrc",
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.p.flags = AVFMT_VARIABLE_FPS | AVFMT_GLOBALHEADER |
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AVFMT_TS_NEGATIVE | AVFMT_TS_NONSTRICT,
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.p.video_codec = AV_CODEC_ID_NONE,
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.p.audio_codec = AV_CODEC_ID_NONE,
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.p.subtitle_codec = AV_CODEC_ID_SUBRIP,
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.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
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.priv_data_size = 0,
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.write_header = lrc_write_header,
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.write_packet = lrc_write_packet,
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};
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