/* * Apple HTTP Live Streaming segmenter * Copyright (c) 2012, 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 #include #include "libavutil/mathematics.h" #include "libavutil/parseutils.h" #include "libavutil/avstring.h" #include "libavutil/opt.h" #include "libavutil/log.h" #include "avformat.h" #include "internal.h" typedef struct ListEntry { char name[1024]; int duration; struct ListEntry *next; } ListEntry; typedef struct HLSContext { const AVClass *class; // Class for private options. unsigned number; int64_t sequence; AVOutputFormat *oformat; AVFormatContext *avf; float time; // Set by a private option. int size; // Set by a private option. int wrap; // Set by a private option. int64_t recording_time; int has_video; int64_t start_pts; int64_t end_pts; int64_t duration; // last segment duration computed so far, in seconds int nb_entries; ListEntry *list; ListEntry *end_list; char *basename; char *baseurl; AVIOContext *pb; } HLSContext; static int hls_mux_init(AVFormatContext *s) { HLSContext *hls = s->priv_data; AVFormatContext *oc; int i; hls->avf = oc = avformat_alloc_context(); if (!oc) return AVERROR(ENOMEM); oc->oformat = hls->oformat; oc->interrupt_callback = s->interrupt_callback; for (i = 0; i < s->nb_streams; i++) { AVStream *st; if (!(st = avformat_new_stream(oc, NULL))) return AVERROR(ENOMEM); avcodec_copy_context(st->codec, s->streams[i]->codec); st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio; } return 0; } static int append_entry(HLSContext *hls, uint64_t duration) { ListEntry *en = av_malloc(sizeof(*en)); if (!en) return AVERROR(ENOMEM); av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name)); en->duration = duration; en->next = NULL; if (!hls->list) hls->list = en; else hls->end_list->next = en; hls->end_list = en; if (hls->nb_entries >= hls->size) { en = hls->list; hls->list = en->next; av_free(en); } else hls->nb_entries++; hls->sequence++; return 0; } static void free_entries(HLSContext *hls) { ListEntry *p = hls->list, *en; while(p) { en = p; p = p->next; av_free(en); } } static int hls_window(AVFormatContext *s, int last) { HLSContext *hls = s->priv_data; ListEntry *en; int target_duration = 0; int ret = 0; if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) goto fail; for (en = hls->list; en; en = en->next) { if (target_duration < en->duration) target_duration = en->duration; } avio_printf(hls->pb, "#EXTM3U\n"); avio_printf(hls->pb, "#EXT-X-VERSION:3\n"); avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration); avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", FFMAX(0, hls->sequence - hls->size)); av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", FFMAX(0, hls->sequence - hls->size)); for (en = hls->list; en; en = en->next) { avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration); if (hls->baseurl) avio_printf(hls->pb, "%s", hls->baseurl); avio_printf(hls->pb, "%s\n", en->name); } if (last) avio_printf(hls->pb, "#EXT-X-ENDLIST\n"); fail: avio_closep(&hls->pb); return ret; } static int hls_start(AVFormatContext *s) { HLSContext *c = s->priv_data; AVFormatContext *oc = c->avf; int err = 0; if (av_get_frame_filename(oc->filename, sizeof(oc->filename), c->basename, c->wrap ? c->number % c->wrap : c->number) < 0) return AVERROR(EINVAL); c->number++; if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) return err; if (oc->oformat->priv_class && oc->priv_data) av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0); return 0; } static int hls_write_header(AVFormatContext *s) { HLSContext *hls = s->priv_data; int ret, i; char *p; const char *pattern = "%d.ts"; int basename_size = strlen(s->filename) + strlen(pattern) + 1; hls->number = 0; hls->recording_time = hls->time * AV_TIME_BASE; hls->start_pts = AV_NOPTS_VALUE; for (i = 0; i < s->nb_streams; i++) hls->has_video += s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO; if (hls->has_video > 1) av_log(s, AV_LOG_WARNING, "More than a single video stream present, " "expect issues decoding it.\n"); hls->oformat = av_guess_format("mpegts", NULL, NULL); if (!hls->oformat) { ret = AVERROR_MUXER_NOT_FOUND; goto fail; } hls->basename = av_malloc(basename_size); if (!hls->basename) { ret = AVERROR(ENOMEM); goto fail; } strcpy(hls->basename, s->filename); p = strrchr(hls->basename, '.'); if (p) *p = '\0'; av_strlcat(hls->basename, pattern, basename_size); if ((ret = hls_mux_init(s)) < 0) goto fail; if ((ret = hls_start(s)) < 0) goto fail; if ((ret = avformat_write_header(hls->avf, NULL)) < 0) return ret; fail: if (ret) { av_free(hls->basename); if (hls->avf) avformat_free_context(hls->avf); } return ret; } static int hls_write_packet(AVFormatContext *s, AVPacket *pkt) { HLSContext *hls = s->priv_data; AVFormatContext *oc = hls->avf; AVStream *st = s->streams[pkt->stream_index]; int64_t end_pts = hls->recording_time * hls->number; int ret, can_split = 1; if (hls->start_pts == AV_NOPTS_VALUE) { hls->start_pts = pkt->pts; hls->end_pts = pkt->pts; } if (hls->has_video) { can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && pkt->flags & AV_PKT_FLAG_KEY; } if (pkt->pts == AV_NOPTS_VALUE) can_split = 0; else hls->duration = av_rescale(pkt->pts - hls->end_pts, st->time_base.num, st->time_base.den); if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base, end_pts, AV_TIME_BASE_Q) >= 0) { ret = append_entry(hls, hls->duration); if (ret) return ret; hls->end_pts = pkt->pts; hls->duration = 0; av_write_frame(oc, NULL); /* Flush any buffered data */ avio_close(oc->pb); ret = hls_start(s); if (ret) return ret; oc = hls->avf; if ((ret = hls_window(s, 0)) < 0) return ret; } ret = ff_write_chained(oc, pkt->stream_index, pkt, s); return ret; } static int hls_write_trailer(struct AVFormatContext *s) { HLSContext *hls = s->priv_data; AVFormatContext *oc = hls->avf; av_write_trailer(oc); avio_closep(&oc->pb); avformat_free_context(oc); av_free(hls->basename); append_entry(hls, hls->duration); hls_window(s, 1); free_entries(hls); avio_close(hls->pb); return 0; } #define OFFSET(x) offsetof(HLSContext, x) #define E AV_OPT_FLAG_ENCODING_PARAM static const AVOption options[] = { {"start_number", "first number in the sequence", OFFSET(sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E}, {"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E}, {"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E}, {"hls_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E}, {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E}, { NULL }, }; static const AVClass hls_class = { .class_name = "hls muxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVOutputFormat ff_hls_muxer = { .name = "hls", .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), .extensions = "m3u8", .priv_data_size = sizeof(HLSContext), .audio_codec = AV_CODEC_ID_MP2, .video_codec = AV_CODEC_ID_MPEG2VIDEO, .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH, .write_header = hls_write_header, .write_packet = hls_write_packet, .write_trailer = hls_write_trailer, .priv_class = &hls_class, };