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  1. /*
  2.  * Apple HTTP Live Streaming segmenter
  3.  * Copyright (c) 2012, Luca Barbato
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <float.h>
  23.  
  24. #include "libavutil/mathematics.h"
  25. #include "libavutil/parseutils.h"
  26. #include "libavutil/avstring.h"
  27. #include "libavutil/opt.h"
  28. #include "libavutil/log.h"
  29.  
  30. #include "avformat.h"
  31. #include "internal.h"
  32.  
  33. typedef struct ListEntry {
  34.     char  name[1024];
  35.     int   duration;
  36.     struct ListEntry *next;
  37. } ListEntry;
  38.  
  39. typedef struct HLSContext {
  40.     const AVClass *class;  // Class for private options.
  41.     unsigned number;
  42.     int64_t sequence;
  43.     AVOutputFormat *oformat;
  44.     AVFormatContext *avf;
  45.     float time;            // Set by a private option.
  46.     int  size;             // Set by a private option.
  47.     int  wrap;             // Set by a private option.
  48.     int64_t recording_time;
  49.     int has_video;
  50.     int64_t start_pts;
  51.     int64_t end_pts;
  52.     int64_t duration;      // last segment duration computed so far, in seconds
  53.     int nb_entries;
  54.     ListEntry *list;
  55.     ListEntry *end_list;
  56.     char *basename;
  57.     AVIOContext *pb;
  58. } HLSContext;
  59.  
  60. static int hls_mux_init(AVFormatContext *s)
  61. {
  62.     HLSContext *hls = s->priv_data;
  63.     AVFormatContext *oc;
  64.     int i;
  65.  
  66.     hls->avf = oc = avformat_alloc_context();
  67.     if (!oc)
  68.         return AVERROR(ENOMEM);
  69.  
  70.     oc->oformat            = hls->oformat;
  71.     oc->interrupt_callback = s->interrupt_callback;
  72.  
  73.     for (i = 0; i < s->nb_streams; i++) {
  74.         AVStream *st;
  75.         if (!(st = avformat_new_stream(oc, NULL)))
  76.             return AVERROR(ENOMEM);
  77.         avcodec_copy_context(st->codec, s->streams[i]->codec);
  78.         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
  79.     }
  80.  
  81.     return 0;
  82. }
  83.  
  84. static int append_entry(HLSContext *hls, uint64_t duration)
  85. {
  86.     ListEntry *en = av_malloc(sizeof(*en));
  87.  
  88.     if (!en)
  89.         return AVERROR(ENOMEM);
  90.  
  91.     av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name));
  92.  
  93.     en->duration = duration;
  94.     en->next     = NULL;
  95.  
  96.     if (!hls->list)
  97.         hls->list = en;
  98.     else
  99.         hls->end_list->next = en;
  100.  
  101.     hls->end_list = en;
  102.  
  103.     if (hls->nb_entries >= hls->size) {
  104.         en = hls->list;
  105.         hls->list = en->next;
  106.         av_free(en);
  107.     } else
  108.         hls->nb_entries++;
  109.  
  110.     hls->sequence++;
  111.  
  112.     return 0;
  113. }
  114.  
  115. static void free_entries(HLSContext *hls)
  116. {
  117.     ListEntry *p = hls->list, *en;
  118.  
  119.     while(p) {
  120.         en = p;
  121.         p = p->next;
  122.         av_free(en);
  123.     }
  124. }
  125.  
  126. static int hls_window(AVFormatContext *s, int last)
  127. {
  128.     HLSContext *hls = s->priv_data;
  129.     ListEntry *en;
  130.     int target_duration = 0;
  131.     int ret = 0;
  132.  
  133.     if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE,
  134.                           &s->interrupt_callback, NULL)) < 0)
  135.         goto fail;
  136.  
  137.     for (en = hls->list; en; en = en->next) {
  138.         if (target_duration < en->duration)
  139.             target_duration = en->duration;
  140.     }
  141.  
  142.     avio_printf(hls->pb, "#EXTM3U\n");
  143.     avio_printf(hls->pb, "#EXT-X-VERSION:3\n");
  144.     avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration);
  145.     avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
  146.                 FFMAX(0, hls->sequence - hls->size));
  147.  
  148.     for (en = hls->list; en; en = en->next) {
  149.         avio_printf(hls->pb, "#EXTINF:%d,\n", en->duration);
  150.         avio_printf(hls->pb, "%s\n", en->name);
  151.     }
  152.  
  153.     if (last)
  154.         avio_printf(hls->pb, "#EXT-X-ENDLIST\n");
  155.  
  156. fail:
  157.     avio_closep(&hls->pb);
  158.     return ret;
  159. }
  160.  
  161. static int hls_start(AVFormatContext *s)
  162. {
  163.     HLSContext *c = s->priv_data;
  164.     AVFormatContext *oc = c->avf;
  165.     int err = 0;
  166.  
  167.     if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
  168.                               c->basename, c->wrap ? c->number % c->wrap : c->number) < 0) {
  169.         av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename);
  170.         return AVERROR(EINVAL);
  171.     }
  172.     c->number++;
  173.  
  174.     if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
  175.                           &s->interrupt_callback, NULL)) < 0)
  176.         return err;
  177.  
  178.     if (oc->oformat->priv_class && oc->priv_data)
  179.         av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0);
  180.  
  181.     return 0;
  182. }
  183.  
  184. static int hls_write_header(AVFormatContext *s)
  185. {
  186.     HLSContext *hls = s->priv_data;
  187.     int ret, i;
  188.     char *p;
  189.     const char *pattern = "%d.ts";
  190.     int basename_size = strlen(s->filename) + strlen(pattern) + 1;
  191.  
  192.     hls->number      = 0;
  193.  
  194.     hls->recording_time = hls->time * AV_TIME_BASE;
  195.     hls->start_pts      = AV_NOPTS_VALUE;
  196.  
  197.     for (i = 0; i < s->nb_streams; i++)
  198.         hls->has_video +=
  199.             s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
  200.  
  201.     if (hls->has_video > 1)
  202.         av_log(s, AV_LOG_WARNING,
  203.                "More than a single video stream present, "
  204.                "expect issues decoding it.\n");
  205.  
  206.     hls->oformat = av_guess_format("mpegts", NULL, NULL);
  207.  
  208.     if (!hls->oformat) {
  209.         ret = AVERROR_MUXER_NOT_FOUND;
  210.         goto fail;
  211.     }
  212.  
  213.     hls->basename = av_malloc(basename_size);
  214.  
  215.     if (!hls->basename) {
  216.         ret = AVERROR(ENOMEM);
  217.         goto fail;
  218.     }
  219.  
  220.     strcpy(hls->basename, s->filename);
  221.  
  222.     p = strrchr(hls->basename, '.');
  223.  
  224.     if (p)
  225.         *p = '\0';
  226.  
  227.     av_strlcat(hls->basename, pattern, basename_size);
  228.  
  229.     if ((ret = hls_mux_init(s)) < 0)
  230.         goto fail;
  231.  
  232.     if ((ret = hls_start(s)) < 0)
  233.         goto fail;
  234.  
  235.     if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
  236.         return ret;
  237.  
  238.  
  239. fail:
  240.     if (ret) {
  241.         av_free(hls->basename);
  242.         if (hls->avf)
  243.             avformat_free_context(hls->avf);
  244.     }
  245.     return ret;
  246. }
  247.  
  248. static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
  249. {
  250.     HLSContext *hls = s->priv_data;
  251.     AVFormatContext *oc = hls->avf;
  252.     AVStream *st = s->streams[pkt->stream_index];
  253.     int64_t end_pts = hls->recording_time * hls->number;
  254.     int is_ref_pkt = 1;
  255.     int ret, can_split = 1;
  256.  
  257.     if (hls->start_pts == AV_NOPTS_VALUE) {
  258.         hls->start_pts = pkt->pts;
  259.         hls->end_pts   = pkt->pts;
  260.     }
  261.  
  262.     if (hls->has_video) {
  263.         can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
  264.                     pkt->flags & AV_PKT_FLAG_KEY;
  265.         is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
  266.     }
  267.     if (pkt->pts == AV_NOPTS_VALUE)
  268.         is_ref_pkt = can_split = 0;
  269.  
  270.     if (is_ref_pkt)
  271.         hls->duration = av_rescale(pkt->pts - hls->end_pts,
  272.                                    st->time_base.num, st->time_base.den);
  273.  
  274.     if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
  275.                                    end_pts, AV_TIME_BASE_Q) >= 0) {
  276.         ret = append_entry(hls, hls->duration);
  277.         if (ret)
  278.             return ret;
  279.  
  280.         hls->end_pts = pkt->pts;
  281.         hls->duration = 0;
  282.  
  283.         av_write_frame(oc, NULL); /* Flush any buffered data */
  284.         avio_close(oc->pb);
  285.  
  286.         ret = hls_start(s);
  287.  
  288.         if (ret)
  289.             return ret;
  290.  
  291.         oc = hls->avf;
  292.  
  293.         if ((ret = hls_window(s, 0)) < 0)
  294.             return ret;
  295.     }
  296.  
  297.     ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
  298.  
  299.     return ret;
  300. }
  301.  
  302. static int hls_write_trailer(struct AVFormatContext *s)
  303. {
  304.     HLSContext *hls = s->priv_data;
  305.     AVFormatContext *oc = hls->avf;
  306.  
  307.     av_write_trailer(oc);
  308.     avio_closep(&oc->pb);
  309.     avformat_free_context(oc);
  310.     av_free(hls->basename);
  311.     append_entry(hls, hls->duration);
  312.     hls_window(s, 1);
  313.  
  314.     free_entries(hls);
  315.     avio_close(hls->pb);
  316.     return 0;
  317. }
  318.  
  319. #define OFFSET(x) offsetof(HLSContext, x)
  320. #define E AV_OPT_FLAG_ENCODING_PARAM
  321. static const AVOption options[] = {
  322.     {"start_number",  "set first number in the sequence",        OFFSET(sequence),AV_OPT_TYPE_INT64,  {.i64 = 0},     0, INT64_MAX, E},
  323.     {"hls_time",      "set segment length in seconds",           OFFSET(time),    AV_OPT_TYPE_FLOAT,  {.dbl = 2},     0, FLT_MAX, E},
  324.     {"hls_list_size", "set maximum number of playlist entries",  OFFSET(size),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},
  325.     {"hls_wrap",      "set number after which the index wraps",  OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
  326.     { NULL },
  327. };
  328.  
  329. static const AVClass hls_class = {
  330.     .class_name = "hls muxer",
  331.     .item_name  = av_default_item_name,
  332.     .option     = options,
  333.     .version    = LIBAVUTIL_VERSION_INT,
  334. };
  335.  
  336.  
  337. AVOutputFormat ff_hls_muxer = {
  338.     .name           = "hls",
  339.     .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
  340.     .extensions     = "m3u8",
  341.     .priv_data_size = sizeof(HLSContext),
  342.     .audio_codec    = AV_CODEC_ID_MP2,
  343.     .video_codec    = AV_CODEC_ID_MPEG2VIDEO,
  344.     .flags          = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
  345.     .write_header   = hls_write_header,
  346.     .write_packet   = hls_write_packet,
  347.     .write_trailer  = hls_write_trailer,
  348.     .priv_class     = &hls_class,
  349. };
  350.