/*
- * Generic segmenter
* Copyright (c) 2011, Luca Barbato
*
* This file is part of Libav.
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file generic segmenter
+ * M3U8 specification can be find here:
+ * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming-08.txt}
+ */
+
#include <float.h>
#include "avformat.h"
#include "internal.h"
+#include "libavutil/avassert.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/parseutils.h"
#include "libavutil/mathematics.h"
+typedef enum {
+ LIST_TYPE_UNDEFINED = -1,
+ LIST_TYPE_FLAT = 0,
+ LIST_TYPE_EXT,
+ LIST_TYPE_M3U8,
+ LIST_TYPE_NB,
+} ListType;
+
typedef struct {
const AVClass *class; /**< Class for private options. */
- int number;
+ int segment_idx; ///< index of the segment file to write, starting from 0
+ int segment_idx_wrap; ///< number after which the index wraps
+ int segment_count; ///< number of segment files already written
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. */
- int wrap; /**< Set by a private option. */
- int64_t offset_time;
- int64_t recording_time;
+ char *format; ///< format to use for output segment files
+ char *list; ///< filename for the segment list file
+ int list_size; ///< number of entries for the segment list file
+ double list_max_segment_time; ///< max segment time in the current list
+ ListType list_type; ///< set the list type
+ AVIOContext *list_pb; ///< list file put-byte context
+ char *time_str; ///< segment duration specification string
+ int64_t time; ///< segment duration
+ char *times_str; ///< segment times specification string
+ int64_t *times; ///< list of segment interval specification
+ int nb_times; ///< number of elments in the times array
+ char *time_delta_str; ///< approximation value duration used for the segment times
+ int64_t time_delta;
int has_video;
- AVIOContext *pb;
+ double start_time, end_time;
} SegmentContext;
static int segment_start(AVFormatContext *s)
{
- SegmentContext *c = s->priv_data;
- AVFormatContext *oc = c->avf;
+ SegmentContext *seg = s->priv_data;
+ AVFormatContext *oc = seg->avf;
int err = 0;
- if (c->wrap)
- c->number %= c->wrap;
+ if (seg->segment_idx_wrap)
+ seg->segment_idx %= seg->segment_idx_wrap;
if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
- s->filename, c->number++) < 0)
+ s->filename, seg->segment_idx++) < 0) {
+ av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
return AVERROR(EINVAL);
+ }
+ seg->segment_count++;
if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
return 0;
fail:
+ av_log(oc, AV_LOG_ERROR, "Failure occurred when starting segment '%s'\n",
+ oc->filename);
avio_close(oc->pb);
av_freep(&oc->priv_data);
return err;
}
-static int segment_end(AVFormatContext *oc)
+static int segment_list_open(AVFormatContext *s)
+{
+ SegmentContext *seg = s->priv_data;
+ int ret;
+
+ ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
+ &s->interrupt_callback, NULL);
+ if (ret < 0)
+ return ret;
+ seg->list_max_segment_time = 0;
+
+ if (seg->list_type == LIST_TYPE_M3U8) {
+ avio_printf(seg->list_pb, "#EXTM3U\n");
+ avio_printf(seg->list_pb, "#EXT-X-VERSION:4\n");
+ }
+
+ return ret;
+}
+
+static void segment_list_close(AVFormatContext *s)
+{
+ SegmentContext *seg = s->priv_data;
+
+ if (seg->list_type == LIST_TYPE_M3U8) {
+ avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%d\n",
+ (int)ceil(seg->list_max_segment_time));
+ avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
+ }
+
+ avio_close(seg->list_pb);
+}
+
+static int segment_end(AVFormatContext *s)
{
+ SegmentContext *seg = s->priv_data;
+ AVFormatContext *oc = seg->avf;
int ret = 0;
if (oc->oformat->write_trailer)
ret = oc->oformat->write_trailer(oc);
+ if (ret < 0)
+ av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
+ oc->filename);
+
+ if (seg->list) {
+ if (seg->list_size && !(seg->segment_count % seg->list_size)) {
+ segment_list_close(s);
+ if ((ret = segment_list_open(s)) < 0)
+ goto end;
+ }
+
+ if (seg->list_type == LIST_TYPE_FLAT) {
+ avio_printf(seg->list_pb, "%s\n", oc->filename);
+ } else if (seg->list_type == LIST_TYPE_EXT) {
+ avio_printf(seg->list_pb, "%s,%f,%f\n", oc->filename, seg->start_time, seg->end_time);
+ } else if (seg->list_type == LIST_TYPE_M3U8) {
+ avio_printf(seg->list_pb, "#EXTINF:%f,\n%s\n",
+ seg->end_time - seg->start_time, oc->filename);
+ }
+ seg->list_max_segment_time = FFMAX(seg->end_time - seg->start_time, seg->list_max_segment_time);
+ avio_flush(seg->list_pb);
+ }
+
+end:
avio_close(oc->pb);
if (oc->oformat->priv_class)
av_opt_free(oc->priv_data);
return ret;
}
+static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
+ const char *times_str)
+{
+ char *p;
+ int i, ret = 0;
+ char *times_str1 = av_strdup(times_str);
+ char *saveptr = NULL;
+
+ if (!times_str1)
+ return AVERROR(ENOMEM);
+
+#define FAIL(err) ret = err; goto end
+
+ *nb_times = 1;
+ for (p = times_str1; *p; p++)
+ if (*p == ',')
+ (*nb_times)++;
+
+ *times = av_malloc(sizeof(**times) * *nb_times);
+ if (!*times) {
+ av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
+ FAIL(AVERROR(ENOMEM));
+ }
+
+ p = times_str1;
+ for (i = 0; i < *nb_times; i++) {
+ int64_t t;
+ char *tstr = av_strtok(p, ",", &saveptr);
+ av_assert0(tstr);
+ p = NULL;
+
+ ret = av_parse_time(&t, tstr, 1);
+ if (ret < 0) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Invalid time duration specification in %s\n", p);
+ FAIL(AVERROR(EINVAL));
+ }
+ (*times)[i] = t;
+
+ /* check on monotonicity */
+ if (i && (*times)[i-1] > (*times)[i]) {
+ av_log(log_ctx, AV_LOG_ERROR,
+ "Specified time %f is greater than the following time %f\n",
+ (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
+ FAIL(AVERROR(EINVAL));
+ }
+ }
+
+end:
+ av_free(times_str1);
+ 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;
+ seg->segment_count = 0;
+
+ if (seg->time_str && seg->times_str) {
+ av_log(s, AV_LOG_ERROR,
+ "segment_time and segment_times options are mutually exclusive, select just one of them\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (seg->times_str) {
+ if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
+ return ret;
+ } else {
+ /* set default value if not specified */
+ if (!seg->time_str)
+ seg->time_str = av_strdup("2");
+ if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
+ av_log(s, AV_LOG_ERROR,
+ "Invalid time duration specification '%s' for segment_time option\n",
+ seg->time_str);
+ return ret;
+ }
+ }
+
+ if (seg->time_delta_str) {
+ if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) {
+ av_log(s, AV_LOG_ERROR,
+ "Invalid time duration specification '%s' for delta option\n",
+ seg->time_delta_str);
+ return ret;
+ }
+ }
oc = avformat_alloc_context();
if (!oc)
return AVERROR(ENOMEM);
- if (seg->list)
- if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
- &s->interrupt_callback, NULL)) < 0)
+ if (seg->list) {
+ if (seg->list_type == LIST_TYPE_UNDEFINED) {
+ if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
+ else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
+ else seg->list_type = LIST_TYPE_FLAT;
+ }
+ if ((ret = segment_list_open(s)) < 0)
goto fail;
+ }
for (i = 0; i< s->nb_streams; i++)
seg->has_video +=
oc->nb_streams = s->nb_streams;
if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
- s->filename, seg->number++) < 0) {
+ s->filename, seg->segment_idx++) < 0) {
ret = AVERROR(EINVAL);
goto fail;
}
+ seg->segment_count++;
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
}
- if (seg->list) {
- avio_printf(seg->pb, "%s\n", oc->filename);
- avio_flush(seg->pb);
- }
-
fail:
if (ret) {
if (oc) {
avformat_free_context(oc);
}
if (seg->list)
- avio_close(seg->pb);
+ segment_list_close(s);
}
return ret;
}
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;
+ int64_t end_pts;
int ret;
- if ((seg->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
+ if (seg->times) {
+ end_pts = seg->segment_count <= seg->nb_times ?
+ seg->times[seg->segment_count-1] : INT64_MAX;
+ } else {
+ end_pts = seg->time * seg->segment_count;
+ }
+
+ /* if the segment has video, start a new segment *only* with a key video frame */
+ if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO || !seg->has_video) &&
av_compare_ts(pkt->pts, st->time_base,
- end_pts, AV_TIME_BASE_Q) >= 0 &&
+ end_pts-seg->time_delta, 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);
+ av_log(s, AV_LOG_DEBUG, "Next segment starts with packet stream:%d pts:%"PRId64" pts_time:%f\n",
+ pkt->stream_index, pkt->pts, pkt->pts * av_q2d(st->time_base));
- if (!ret)
- ret = segment_start(s);
-
- if (ret)
+ if ((ret = segment_end(s)) < 0 || (ret = segment_start(s)) < 0)
goto fail;
-
- if (seg->list) {
- avio_printf(seg->pb, "%s\n", oc->filename);
- avio_flush(seg->pb);
- if (seg->size && !(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;
- }
- }
+ seg->start_time = (double)pkt->pts * av_q2d(st->time_base);
+ } else if (pkt->pts != AV_NOPTS_VALUE) {
+ seg->end_time = FFMAX(seg->end_time,
+ (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
}
ret = oc->oformat->write_packet(oc, pkt);
oc->streams = NULL;
oc->nb_streams = 0;
if (seg->list)
- avio_close(seg->pb);
+ avio_close(seg->list_pb);
avformat_free_context(oc);
}
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
- int ret = segment_end(oc);
+ int ret = segment_end(s);
if (seg->list)
- avio_close(seg->pb);
+ segment_list_close(s);
+
+ av_opt_free(seg);
+ av_freep(&seg->times);
+
oc->streams = NULL;
oc->nb_streams = 0;
avformat_free_context(oc);
#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 },
- { "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, E },
+ { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
+ { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
+ { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, E },
+ { "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.dbl = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },
+ { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.dbl=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, 0, "list_type" },
+ { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.dbl=LIST_TYPE_EXT }, INT_MIN, INT_MAX, 0, "list_type" },
+ { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.dbl=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, 0, "list_type" },
+ { "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
+ { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E },
+ { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
+ { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, E },
{ NULL },
};
.version = LIBAVUTIL_VERSION_INT,
};
-
AVOutputFormat ff_segment_muxer = {
.name = "segment",
- .long_name = NULL_IF_CONFIG_SMALL("segment muxer"),
+ .long_name = NULL_IF_CONFIG_SMALL("segment"),
.priv_data_size = sizeof(SegmentContext),
.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
.write_header = seg_write_header,
.write_trailer = seg_write_trailer,
.priv_class = &seg_class,
};
+
+static const AVClass sseg_class = {
+ .class_name = "stream_segment muxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_stream_segment_muxer = {
+ .name = "stream_segment,ssegment",
+ .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
+ .priv_data_size = sizeof(SegmentContext),
+ .flags = AVFMT_NOFILE,
+ .write_header = seg_write_header,
+ .write_packet = seg_write_packet,
+ .write_trailer = seg_write_trailer,
+ .priv_class = &sseg_class,
+};
projects / ffmpeg / blobdiff