From 22a0827dff29a94e7fd07ad2782f169b2703c70d Mon Sep 17 00:00:00 2001 From: Luca Barbato Date: Fri, 26 Oct 2012 16:36:56 +0200 Subject: hlsenc: stand alone hls segmenter Simplifies usage but has higher latency. --- libavformat/hlsenc.c | 324 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 324 insertions(+) create mode 100644 libavformat/hlsenc.c (limited to 'libavformat/hlsenc.c') diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c new file mode 100644 index 0000000..88f47e0 --- /dev/null +++ b/libavformat/hlsenc.c @@ -0,0 +1,324 @@ +/* + * 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 "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. + int number; + 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; + ListEntry *list; + ListEntry *end_list; + char *basename; + 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_get_frame_filename(en->name, sizeof(en->name), hls->basename, + hls->number -1); + + en->duration = duration; + en->next = NULL; + + if (!hls->list) + hls->list = en; + else + hls->end_list->next = en; + + hls->end_list = en; + + if (hls->number >= hls->size) { + en = hls->list; + hls->list = en->next; + av_free(en); + } + + 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 ret = 0; + + if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE, + &s->interrupt_callback, NULL)) < 0) + goto fail; + + avio_printf(hls->pb, "#EXTM3U\n"); + avio_printf(hls->pb, "#EXT-X-VERSION:3\n"); + avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", (int)hls->time); + avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", + FFMAX(0, hls->number - hls->size)); + + for (en = hls->list; en; en = en->next) { + avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration); + 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 (c->wrap) + c->number %= c->wrap; + + if (av_get_frame_filename(oc->filename, sizeof(oc->filename), + c->basename, 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->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); + + hls->number = 0; + + hls->recording_time = hls->time * 1000000; + 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, "%d.ts", 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; + + if (hls->start_pts == AV_NOPTS_VALUE) { + hls->start_pts = pkt->pts; + hls->end_pts = pkt->pts; + } + end_pts += hls->start_pts; + + if ((hls->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) { + + append_entry(hls, av_rescale(pkt->pts - hls->end_pts, + st->time_base.num, + st->time_base.den)); + hls->end_pts = pkt->pts; + + 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); + 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[] = { + {"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}, + { 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("hls"), + .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, +}; -- cgit v1.1