| 0,0 → 1,175 |
|---|
| /* |
| * 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 "libavutil/mathematics.h" |
| #include "avformat.h" |
| #include "ffmeta.h" |
| #include "internal.h" |
| #include "libavutil/dict.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(AVIOContext *s, uint8_t *buf, int size) |
| { |
| do { |
| uint8_t c; |
| int i = 0; |
| |
| while ((c = avio_r8(s))) { |
| if (c == '\\') { |
| if (i < size - 1) |
| buf[i++] = c; |
| c = avio_r8(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=%"SCNd64, &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=%"SCNd64, &end)) { |
| av_log(s, AV_LOG_ERROR, "Expected chapter end timestamp, found %s.\n", line); |
| end = AV_NOPTS_VALUE; |
| } |
| |
| return avpriv_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, AVDictionary **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_dict_set(m, key, value, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); |
| return 0; |
| } |
| |
| static int read_header(AVFormatContext *s) |
| { |
| AVDictionary **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 = avformat_new_stream(s, NULL); |
| |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codec->codec_type = AVMEDIA_TYPE_DATA; |
| st->codec->codec_id = AV_CODEC_ID_FFMETADATA; |
| |
| m = &st->metadata; |
| } else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) { |
| AVChapter *ch = read_chapter(s); |
| |
| if (!ch) |
| return AVERROR(ENOMEM); |
| |
| 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 ff_ffmetadata_demuxer = { |
| .name = "ffmetadata", |
| .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"), |
| .read_probe = probe, |
| .read_header = read_header, |
| .read_packet = read_packet, |
| }; |