[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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