From 645439c3c3ce39114e4f46a9198cd8b9a11c3e66 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Tue, 28 Dec 2010 09:03:33 +0000 Subject: lavf: rename meta{dec,enc}.c -> ffmeta{dec,enc}.c Originally committed as revision 26113 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/ffmetadec.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 libavformat/ffmetadec.c (limited to 'libavformat/ffmetadec.c') diff --git a/libavformat/ffmetadec.c b/libavformat/ffmetadec.c new file mode 100644 index 0000000000..0269ac5a0b --- /dev/null +++ b/libavformat/ffmetadec.c @@ -0,0 +1,172 @@ +/* + * Metadata demuxer + * Copyright (c) 2010 Anton Khirnov + * + * 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 "avformat.h" +#include "meta.h" + +static int probe(AVProbeData *p) +{ + if(!memcmp(p->buf, ID_STRING, strlen(ID_STRING))) + return AVPROBE_SCORE_MAX; + return 0; +} + +static void get_line(ByteIOContext *s, uint8_t *buf, int size) +{ + do { + uint8_t c; + int i = 0; + + while ((c = get_byte(s))) { + if (c == '\\') { + if (i < size - 1) + buf[i++] = c; + c = get_byte(s); + } else if (c == '\n') + break; + + if (i < size - 1) + buf[i++] = c; + } + buf[i] = 0; + } while (!url_feof(s) && (buf[0] == ';' || buf[0] == '#' || buf[0] == 0)); +} + +static AVChapter *read_chapter(AVFormatContext *s) +{ + uint8_t line[256]; + int64_t start, end; + AVRational tb = {1, 1e9}; + + get_line(s->pb, line, sizeof(line)); + + if (sscanf(line, "TIMEBASE=%d/%d", &tb.num, &tb.den)) + get_line(s->pb, line, sizeof(line)); + if (!sscanf(line, "START=%lld", &start)) { + av_log(s, AV_LOG_ERROR, "Expected chapter start timestamp, found %s.\n", line); + start = (s->nb_chapters && s->chapters[s->nb_chapters - 1]->end != AV_NOPTS_VALUE) ? + s->chapters[s->nb_chapters - 1]->end : 0; + } else + get_line(s->pb, line, sizeof(line)); + + if (!sscanf(line, "END=%lld", &end)) { + av_log(s, AV_LOG_ERROR, "Expected chapter end timestamp, found %s.\n", line); + end = AV_NOPTS_VALUE; + } + + return ff_new_chapter(s, s->nb_chapters, tb, start, end, NULL); +} + +static uint8_t *unescape(uint8_t *buf, int size) +{ + uint8_t *ret = av_malloc(size + 1); + uint8_t *p1 = ret, *p2 = buf; + + if (!ret) + return NULL; + + while (p2 < buf + size) { + if (*p2 == '\\') + p2++; + *p1++ = *p2++; + } + *p1 = 0; + return ret; +} + +static int read_tag(uint8_t *line, AVMetadata **m) +{ + uint8_t *key, *value, *p = line; + + /* find first not escaped '=' */ + while (1) { + if (*p == '=') + break; + else if (*p == '\\') + p++; + + if (*p++) + continue; + + return 0; + } + + if (!(key = unescape(line, p - line))) + return AVERROR(ENOMEM); + if (!(value = unescape(p + 1, strlen(p + 1)))) { + av_free(key); + return AVERROR(ENOMEM); + } + + av_metadata_set2(m, key, value, AV_METADATA_DONT_STRDUP_KEY | AV_METADATA_DONT_STRDUP_VAL); + return 0; +} + +static int read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + AVMetadata **m = &s->metadata; + uint8_t line[1024]; + + while(!url_feof(s->pb)) { + get_line(s->pb, line, sizeof(line)); + + if (!memcmp(line, ID_STREAM, strlen(ID_STREAM))) { + AVStream *st = av_new_stream(s, 0); + + if (!st) + return -1; + + st->codec->codec_type = AVMEDIA_TYPE_DATA; + st->codec->codec_id = CODEC_ID_FFMETADATA; + + m = &st->metadata; + } else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) { + AVChapter *ch = read_chapter(s); + + if (!ch) + return -1; + + m = &ch->metadata; + } else + read_tag(line, m); + } + + s->start_time = 0; + if (s->nb_chapters) + s->duration = av_rescale_q(s->chapters[s->nb_chapters - 1]->end, + s->chapters[s->nb_chapters - 1]->time_base, + AV_TIME_BASE_Q); + + return 0; +} + +static int read_packet(AVFormatContext *s, AVPacket *pkt) +{ + return AVERROR_EOF; +} + +AVInputFormat ffmetadata_demuxer = { + .name = "ffmetadata", + .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text format"), + .read_probe = probe, + .read_header = read_header, + .read_packet = read_packet, +}; -- cgit v1.2.3