[SCM] libav/experimental: Metadata demuxer.
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 17:20:53 UTC 2013
The following commit has been merged in the experimental branch:
commit fd5b124d748249d5f5b33f5901042738d0c893d8
Author: Anton Khirnov <wyskas at gmail.com>
Date: Mon Dec 27 07:46:53 2010 +0000
Metadata demuxer.
Originally committed as revision 26102 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/Changelog b/Changelog
index d12ea42..fa9f41f 100644
--- a/Changelog
+++ b/Changelog
@@ -68,6 +68,7 @@ version <next>:
- AMR-WB decoder
- replace the ocv_smooth filter with a more generic ocv filter
- Windows Televison (WTV) demuxer
+- FFmpeg metadata format muxer and demuxer
version 0.6:
diff --git a/doc/general.texi b/doc/general.texi
index 75c6f57..8004925 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -118,7 +118,7 @@ library:
@tab VR native stream format, used by Leitch/Harris' video servers.
@item Matroska @tab X @tab X
@item Matroska audio @tab X @tab
- at item FFmpeg metadata @tab X @tab
+ at item FFmpeg metadata @tab X @tab X
@tab Metadata in text format.
@item MAXIS XA @tab @tab X
@tab Used in Sim City 3000; file extension .xa.
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 9c111bb..871a592 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -406,6 +406,7 @@ enum CodecID {
CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
* stream (only used by libavformat) */
+ CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
};
#if LIBAVCODEC_VERSION_MAJOR < 53
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 0cd817f..4b031f4 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -71,6 +71,7 @@ OBJS-$(CONFIG_EAC3_DEMUXER) += ac3dec.o rawdec.o
OBJS-$(CONFIG_EAC3_MUXER) += rawenc.o
OBJS-$(CONFIG_FFM_DEMUXER) += ffmdec.o
OBJS-$(CONFIG_FFM_MUXER) += ffmenc.o
+OBJS-$(CONFIG_FFMETADATA_DEMUXER) += metadec.o
OBJS-$(CONFIG_FFMETADATA_MUXER) += metaenc.o
OBJS-$(CONFIG_FILMSTRIP_DEMUXER) += filmstripdec.o
OBJS-$(CONFIG_FILMSTRIP_MUXER) += filmstripenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d61b3d2..d543ad1 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -85,7 +85,7 @@ void av_register_all(void)
REGISTER_DEMUXER (EA_CDATA, ea_cdata);
REGISTER_MUXDEMUX (EAC3, eac3);
REGISTER_MUXDEMUX (FFM, ffm);
- REGISTER_MUXER (FFMETADATA, ffmetadata);
+ REGISTER_MUXDEMUX (FFMETADATA, ffmetadata);
REGISTER_MUXDEMUX (FILMSTRIP, filmstrip);
REGISTER_MUXDEMUX (FLAC, flac);
REGISTER_DEMUXER (FLIC, flic);
diff --git a/libavformat/metadec.c b/libavformat/metadec.c
new file mode 100644
index 0000000..0269ac5
--- /dev/null
+++ b/libavformat/metadec.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,
+};
--
Libav/FFmpeg packaging
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