| /* |
| * Apple HTTP Live Streaming segmenter |
| * Copyright (c) 2012, Luca Barbato |
| * |
| * 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 |
| */ |
| |
| #include <float.h> |
| |
| #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; |
| int nb_entries; |
| 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_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)); |
| |
| 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) { |
| av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename); |
| 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) + 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 (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base, |
| end_pts, AV_TIME_BASE_Q) >= 0) { |
| ret = append_entry(hls, av_rescale(pkt->pts - hls->end_pts, |
| st->time_base.num, |
| st->time_base.den)); |
| if (ret) |
| return ret; |
| |
| 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[] = { |
| { "start_number", "set first number in the sequence", OFFSET(number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E}, |
| { "hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E}, |
| { "hls_list_size","set maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E}, |
| { "hls_wrap", "set 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("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, |
| }; |