[FFmpeg-devel] [PATCH 1/7] lavf: add cue sheet demuxer
Rodger Combs
rodger.combs at gmail.com
Tue Aug 1 09:33:48 EEST 2017
---
Changelog | 2 +
doc/demuxers.texi | 8 ++
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/cuedec.c | 215 +++++++++++++++++++++++++++++++++++++++++++++++
libavformat/version.h | 2 +-
6 files changed, 228 insertions(+), 1 deletion(-)
create mode 100644 libavformat/cuedec.c
diff --git a/Changelog b/Changelog
index 187ae79..6701d30 100644
--- a/Changelog
+++ b/Changelog
@@ -29,6 +29,8 @@ version <next>:
- limiter video filter
- libvmaf video filter
- Dolby E decoder and SMPTE 337M demuxer
+- Cue sheet demuxer
+
version 3.3:
- CrystalHD decoder moved to new decode API
diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 29a23d4..7ea4f27 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -244,6 +244,14 @@ file subdir/file-2.wav
@end example
@end itemize
+ at section cue
+
+Cue sheet demuxer.
+
+This demuxer reads a cue sheet (text file) and exports its track listing in
+the form of AVChapters. Packet data is read from the file listed in the sheet.
+To override the path the packet data is read from, use the @code{url} option.
+
@section flv, live_flv
Adobe Flash Video Format demuxer.
diff --git a/libavformat/Makefile b/libavformat/Makefile
index b0ef82c..4381c42 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -130,6 +130,7 @@ OBJS-$(CONFIG_CDXL_DEMUXER) += cdxl.o
OBJS-$(CONFIG_CINE_DEMUXER) += cinedec.o
OBJS-$(CONFIG_CONCAT_DEMUXER) += concatdec.o
OBJS-$(CONFIG_CRC_MUXER) += crcenc.o
+OBJS-$(CONFIG_CUE_DEMUXER) += cuedec.o
OBJS-$(CONFIG_DATA_DEMUXER) += rawdec.o
OBJS-$(CONFIG_DATA_MUXER) += rawenc.o
OBJS-$(CONFIG_DASH_MUXER) += dashenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 1ebc142..25afa8b 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -96,6 +96,7 @@ static void register_all(void)
REGISTER_DEMUXER (CINE, cine);
REGISTER_DEMUXER (CONCAT, concat);
REGISTER_MUXER (CRC, crc);
+ REGISTER_DEMUXER (CUE, cue);
REGISTER_MUXER (DASH, dash);
REGISTER_MUXDEMUX(DATA, data);
REGISTER_MUXDEMUX(DAUD, daud);
diff --git a/libavformat/cuedec.c b/libavformat/cuedec.c
new file mode 100644
index 0000000..d0dcac4
--- /dev/null
+++ b/libavformat/cuedec.c
@@ -0,0 +1,215 @@
+/*
+ * Cue sheet demuxer
+ * Copyright (c) 2016 The FFmpeg Project
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Cue sheet demuxer
+ * @author Rodger Combs <rodger.combs at gmail.com>
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "url.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+
+typedef struct CueDemuxContext {
+ AVClass *class;
+ char *url;
+ AVFormatContext *avf;
+} CueDemuxContext;
+
+static int cue_probe(AVProbeData *p)
+{
+ const unsigned char *ptr = p->buf;
+
+ if (AV_RB24(ptr) == 0xEFBBBF)
+ ptr += 3; /* skip UTF-8 BOM */
+ while (*ptr && strncmp(ptr, "FILE ", 5))
+ ptr += ff_subtitles_next_line(ptr);
+ if (!strncmp(ptr, "FILE ", 5))
+ return AVPROBE_SCORE_MAX - 5;
+ return 0;
+}
+
+static char *get_token(char *in)
+{
+ char *end;
+ while (av_isspace(*in))
+ in++;
+ if (*in == '"') {
+ in++;
+ end = in + strcspn(in, "\"\n\t\r");
+ } else {
+ end = in + strcspn(in, " \n\t\r");
+ }
+ *end = '\0';
+ return in;
+}
+
+static int cue_read_header(AVFormatContext *s)
+{
+ int ret, i;
+ CueDemuxContext *cue = s->priv_data;
+ char line[4096], *ptr;
+ AVDictionary **meta = &s->metadata;
+ AVChapter *chap = NULL;
+ while (ff_get_line(s->pb, line, sizeof(line))) {
+ ptr = line;
+ if (AV_RB24(ptr) == 0xEFBBBF)
+ ptr += 3; /* skip UTF-8 BOM */
+ while (*ptr == ' ' || *ptr == '\t')
+ ptr++;
+ if (!strncmp(ptr, "REM ", 4)) {
+ char *end = ptr + strcspn(ptr, "\r\n");
+ *end = '\0';
+ av_log(s, AV_LOG_INFO, "Comment: \"%s\"\n", ptr + 4);
+ } else if (!strncmp(ptr, "TITLE ", 6)) {
+ ptr = get_token(ptr + 6);
+ av_dict_set(meta, chap ? "title" : "album", ptr, 0);
+ } else if (!strncmp(ptr, "PERFORMER ", 10)) {
+ ptr = get_token(ptr + 10);
+ av_dict_set(meta, chap ? "artist" : "album_artist", ptr, 0);
+ } else if (!strncmp(ptr, "FILE ", 5)) {
+ if (!cue->url || !*cue->url) {
+ const char *filename = get_token(ptr + 5);
+ char url[4096] = {0};
+
+ if (filename[strcspn(filename, "/\\:")] != 0) {
+ av_log(s, AV_LOG_ERROR, "Only bare filenames are allowed in cue FILE directives.\n"
+ "To read from '%s', use the 'url' option explicitly.", filename);
+ return AVERROR_INVALIDDATA;
+ }
+
+ av_freep(&cue->url);
+ ff_make_absolute_url(url, sizeof(url), s->filename, filename);
+ if (!(cue->url = av_strdup(url)))
+ return AVERROR(ENOMEM);
+ }
+ } else if (!strncmp(ptr, "TRACK ", 6)) {
+ int index = strtol(ptr + 6, &ptr, 10);
+ chap = avpriv_new_chapter(s, index, (AVRational){1, 75}, AV_NOPTS_VALUE, AV_NOPTS_VALUE, NULL);
+ if (!chap)
+ return AVERROR(ENOMEM);
+ meta = &chap->metadata;
+ if ((ret = av_dict_copy(meta, s->metadata, 0)) < 0)
+ return ret;
+ av_dict_set_int(meta, "track", index, 0);
+ } else if (!strncmp(ptr, "INDEX ", 6)) {
+ int min, sec, frame;
+ int index = strtol(ptr + 6, &ptr, 10);
+ if (!chap)
+ return AVERROR_INVALIDDATA;
+ if (sscanf(ptr, "%u:%u:%u", &min, &sec, &frame) != 3)
+ return AVERROR_INVALIDDATA;
+ if (index == 1 || chap->start == 0)
+ chap->start = min * 75 * 60 + sec * 75 + frame;
+ } else {
+ av_log(s, AV_LOG_WARNING, "Unknown command: \"%s\"\n", ptr);
+ }
+ }
+
+ if (!cue->url || !*cue->url)
+ return AVERROR_INVALIDDATA;
+
+ if (!(cue->avf = avformat_alloc_context()))
+ return AVERROR(ENOMEM);
+
+ cue->avf->interrupt_callback = s->interrupt_callback;
+ if ((ret = ff_copy_whiteblacklists(cue->avf, s)) < 0)
+ return ret;
+
+ if ((ret = avformat_open_input(&cue->avf, cue->url, NULL, NULL)) < 0 ||
+ (ret = avformat_find_stream_info(cue->avf, NULL)) < 0) {
+ av_log(s, AV_LOG_ERROR, "Failed to open '%s'\n", cue->url);
+ avformat_close_input(&cue->avf);
+ return ret;
+ }
+
+ ff_read_frame_flush(cue->avf);
+
+ for (i = 0; i < cue->avf->nb_streams; i++) {
+ AVStream *st = avformat_new_stream(s, NULL);
+ AVStream *ist = cue->avf->streams[i];
+ if (!st)
+ return AVERROR(ENOMEM);
+ st->id = i;
+
+ avcodec_parameters_copy(st->codecpar, ist->codecpar);
+
+ st->disposition = ist->disposition;
+ avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
+ av_copy_packet(&st->attached_pic, &ist->attached_pic);
+ }
+
+ s->duration = cue->avf->duration;
+
+ return 0;
+}
+
+static int cue_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ CueDemuxContext *cue = s->priv_data;
+ return av_read_frame(cue->avf, pkt);
+}
+
+static int cue_read_seek(AVFormatContext *s, int stream_index,
+ int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+ CueDemuxContext *cue = s->priv_data;
+ return avformat_seek_file(cue->avf, stream_index, min_ts, ts, max_ts, flags);
+}
+
+static int cue_read_close(AVFormatContext *s)
+{
+ CueDemuxContext *cue = s->priv_data;
+ avformat_close_input(&cue->avf);
+ return 0;
+}
+
+#define OFFSET(x) offsetof(CueDemuxContext, x)
+#define E AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ { "url", "override underlying audio location", OFFSET(url), AV_OPT_TYPE_STRING, {.str = ""}, CHAR_MIN, CHAR_MAX, E },
+ { NULL }
+};
+
+static const AVClass cue_class = {
+ .class_name = "Cue sheet demuxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_cue_demuxer = {
+ .name = "cue",
+ .long_name = NULL_IF_CONFIG_SMALL("Cue sheet"),
+ .extensions = "cue",
+ .priv_data_size = sizeof(CueDemuxContext),
+ .read_probe = cue_probe,
+ .read_header = cue_read_header,
+ .read_packet = cue_read_packet,
+ .read_seek2 = cue_read_seek,
+ .read_close = cue_read_close,
+ .priv_class = &cue_class,
+};
diff --git a/libavformat/version.h b/libavformat/version.h
index 48b81f2..a8cf4c1 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,7 +32,7 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR 76
+#define LIBAVFORMAT_VERSION_MINOR 77
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
2.6.4
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