@@ -109,6 +109,7 @@ easier to use. The changes are:

 - Dxtory capture format decoder

 - v410 QuickTime uncompressed 4:4:4 10-bit encoder and decoder

 - OpenMG Audio muxer

+- Simple segmenting muxer

 version 0.7:

@@ -90,6 +90,7 @@ avconv -i INPUT -c:a pcm_u8 -c:v mpeg2video -f framecrc -

 See also the @ref{crc} muxer.

+@anchor{image2}

 @section image2

 Image file muxer.

@@ -267,4 +268,35 @@ For example a 3D WebM clip can be created using the following command line:

 avconv -i sample_left_right_clip.mpg -an -c:v libvpx -metadata STEREO_MODE=left_right -y stereo_clip.webm

 @end example

+@section segment

+

+Basic stream segmenter.

+

+The segmenter muxer outputs streams to a number of separate files of nearly

+fixed duration. Output filename pattern can be set in a fashion similar to

+@ref{image2}.

+

+Every segment starts with a video keyframe, if a video stream is present.

+The segment muxer works best with a single constant frame rate video.

+

+Optionally it can generate a flat list of the created segments, one segment

+per line.

+

+@table @option

+@item segment_format @var{format}

+Override the inner container format, by default it is guessed by the filename

+extension.

+@item segment_time @var{t}

+Set segment duration to @var{t} seconds.

+@item segment_list @var{name}

+Generate also a listfile named @var{name}.

+@item segment_list_size @var{size}

+Overwrite the listfile once it reaches @var{size} entries.

+@end table

+

+@example

+avconv -i in.mkv -c copy -map 0 -f segment -list out.list out%03d.nut

+@end example

+

+

 @c man end MUXERS

@@ -268,6 +268,7 @@ OBJS-$(CONFIG_SAP_DEMUXER)               += sapdec.o

 OBJS-$(CONFIG_SAP_MUXER)                 += sapenc.o rtpenc_chain.o

 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o

 OBJS-$(CONFIG_SEGAFILM_DEMUXER)          += segafilm.o

+OBJS-$(CONFIG_SEGMENT_MUXER)             += segment.o

 OBJS-$(CONFIG_SHORTEN_DEMUXER)           += rawdec.o

 OBJS-$(CONFIG_SIFF_DEMUXER)              += siff.o

 OBJS-$(CONFIG_SMACKER_DEMUXER)           += smacker.o

@@ -197,6 +197,7 @@ void av_register_all(void)

     av_register_rdt_dynamic_payload_handlers();

 #endif

     REGISTER_DEMUXER  (SEGAFILM, segafilm);

+    REGISTER_MUXER    (SEGMENT, segment);

     REGISTER_DEMUXER  (SHORTEN, shorten);

     REGISTER_DEMUXER  (SIFF, siff);

     REGISTER_DEMUXER  (SMACKER, smacker);

new file mode 100644

@@ -0,0 +1,273 @@

+/*

+ * Generic segmenter

+ * Copyright (c) 2011, Luca Barbato

+ *

+ * This file is part of Libav.

+ *

+ * Libav 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.

+ *

+ * Libav 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 Libav; if not, write to the Free Software

+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

+ */

+

+#include <strings.h>

+#include <float.h>

+

+#include "avformat.h"

+#include "internal.h"

+

+#include "libavutil/log.h"

+#include "libavutil/opt.h"

+#include "libavutil/avstring.h"

+#include "libavutil/parseutils.h"

+#include "libavutil/mathematics.h"

+

+typedef struct {

+    const AVClass *class;  /**< Class for private options. */

+    int number;

+    AVFormatContext *avf;

+    char *format;          /**< Set by a private option. */

+    char *list;            /**< Set by a private option. */

+    float time;            /**< Set by a private option. */

+    int  size;             /**< Set by a private option. */

+    int64_t offset_time;

+    int64_t recording_time;

+    int has_video;

+    AVIOContext *pb;

+} SegmentContext;

+

+static int segment_start(AVFormatContext *s)

+{

+    SegmentContext *c = s->priv_data;

+    AVFormatContext *oc = c->avf;

+    int err = 0;

+

+    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),

+                              s->filename, c->number++) < 0)

+        return AVERROR(EINVAL);

+

+    if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

+                          &s->interrupt_callback, NULL)) < 0)

+        return err;

+

+    if (!oc->priv_data && oc->oformat->priv_data_size > 0) {

+        oc->priv_data = av_mallocz(oc->oformat->priv_data_size);

+        if (!oc->priv_data) {

+            avio_close(oc->pb);

+            return AVERROR(ENOMEM);

+        }

+        if (oc->oformat->priv_class) {

+            *(const AVClass**)oc->priv_data = oc->oformat->priv_class;

+            av_opt_set_defaults(oc->priv_data);

+        }

+    }

+

+    if ((err = oc->oformat->write_header(oc)) < 0) {

+        goto fail;

+    }

+

+    return 0;

+

+fail:

+    avio_close(oc->pb);

+    av_freep(&oc->priv_data);

+

+    return err;

+}

+

+static int segment_end(AVFormatContext *oc)

+{

+    int ret = 0;

+

+    if (oc->oformat->write_trailer)

+        ret = oc->oformat->write_trailer(oc);

+

+    avio_close(oc->pb);

+    if (oc->oformat->priv_class)

+        av_opt_free(oc->priv_data);

+    av_freep(&oc->priv_data);

+

+    return ret;

+}

+

+static int seg_write_header(AVFormatContext *s)

+{

+    SegmentContext *seg = s->priv_data;

+    AVFormatContext *oc;

+    int ret, i;

+

+    seg->number = 0;

+    seg->offset_time = 0;

+    seg->recording_time = seg->time * 1000000;

+

+    if (seg->list)

+        if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,

+                              &s->interrupt_callback, NULL)) < 0)

+            return ret;

+

+    for (i = 0; i< s->nb_streams; i++)

+        seg->has_video +=

+            (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);

+

+    if (seg->has_video > 1)

+        av_log(s, AV_LOG_WARNING,

+               "More than a single video stream present, "

+               "expect issues decoding it.\n");

+

+    oc = avformat_alloc_context();

+

+    if (!oc) {

+        ret = AVERROR(ENOMEM);

+        goto fail;

+    }

+

+    oc->oformat = av_guess_format(seg->format, s->filename, NULL);

+

+    if (!oc->oformat) {

+        ret = AVERROR_MUXER_NOT_FOUND;

+        goto fail;

+    }

+    if (oc->oformat->flags & AVFMT_NOFILE) {

+        av_log(s, AV_LOG_ERROR, "format %s not supported.\n",

+               oc->oformat->name);

+        ret = AVERROR(EINVAL);

+        goto fail;

+    }

+

+    seg->avf = oc;

+

+    oc->streams = s->streams;

+    oc->nb_streams = s->nb_streams;

+

+    if (av_get_frame_filename(oc->filename, sizeof(oc->filename),

+                              s->filename, seg->number++) < 0) {

+        ret = AVERROR(EINVAL);

+        goto fail;

+    }

+

+    if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,

+                          &s->interrupt_callback, NULL)) < 0)

+        goto fail;

+

+    if ((ret = avformat_write_header(oc, NULL)) < 0) {

+        avio_close(oc->pb);

+        goto fail;

+    }

+

+    if (seg->list) {

+        avio_printf(seg->pb, "%s\n", oc->filename);

+        avio_flush(seg->pb);

+    }

+

+fail:

+    if (ret) {

+        oc->streams = NULL;

+        oc->nb_streams = 0;

+        if (seg->list)

+            avio_close(seg->pb);

+        avformat_free_context(oc);

+    }

+    return ret;

+}

+

+static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)

+{

+    SegmentContext *seg = s->priv_data;

+    AVFormatContext *oc = seg->avf;

+    AVStream *st = oc->streams[pkt->stream_index];

+    int64_t end_pts = seg->recording_time * seg->number;

+    int ret;

+

+    if ((seg->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&

+        av_compare_ts(pkt->pts, st->time_base,

+                      end_pts, AV_TIME_BASE_Q) >= 0 &&

+        pkt->flags & AV_PKT_FLAG_KEY) {

+

+        av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n",

+               pkt->stream_index, pkt->pts);

+

+        ret = segment_end(oc);

+

+        if (!ret)

+            ret = segment_start(s);

+

+        if (ret)

+            goto fail;

+

+        if (seg->list) {

+            avio_printf(seg->pb, "%s\n", oc->filename);

+            avio_flush(seg->pb);

+            if (!(seg->number % seg->size)) {

+                avio_close(seg->pb);

+                if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,

+                                      &s->interrupt_callback, NULL)) < 0)

+                    goto fail;

+

+            }

+        }

+    }

+

+    ret = oc->oformat->write_packet(oc, pkt);

+

+fail:

+    if (ret < 0) {

+        oc->streams = NULL;

+        oc->nb_streams = 0;

+        if (seg->list)

+            avio_close(seg->pb);

+        avformat_free_context(oc);

+    }

+

+    return ret;

+}

+

+static int seg_write_trailer(struct AVFormatContext *s)

+{

+    SegmentContext *seg = s->priv_data;

+    AVFormatContext *oc = seg->avf;

+    int ret = segment_end(oc);

+    if (seg->list)

+        avio_close(seg->pb);

+    oc->streams = NULL;

+    oc->nb_streams = 0;

+    avformat_free_context(oc);

+    return ret;

+}

+

+#define OFFSET(x) offsetof(SegmentContext, x)

+#define E AV_OPT_FLAG_ENCODING_PARAM

+static const AVOption options[] = {

+    { "segment_format",    "container format used for the segments",  OFFSET(format),  AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },

+    { "segment_time",      "segment length in seconds",               OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E },

+    { "segment_list",      "output the segment list",                 OFFSET(list),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },

+    { "segment_list_size", "maximum number of playlist entries",      OFFSET(size),    AV_OPT_TYPE_INT,    {.dbl = 5},     0, INT_MAX, E },

+    { NULL },

+};

+

+static const AVClass seg_class = {

+    .class_name = "segment muxer",

+    .item_name  = av_default_item_name,

+    .option     = options,

+    .version    = LIBAVUTIL_VERSION_INT,

+};

+

+

+AVOutputFormat ff_segment_muxer = {

+    .name           = "segment",

+    .long_name      = NULL_IF_CONFIG_SMALL("segment muxer"),

+    .priv_data_size = sizeof(SegmentContext),

+    .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,

+    .write_header   = seg_write_header,

+    .write_packet   = seg_write_packet,

+    .write_trailer  = seg_write_trailer,

+    .priv_class     = &seg_class,

+};