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#include <stdint.h> 24 25#include "libavutil/mathematics.h" 26#include "libavutil/parseutils.h" 27#include "libavutil/avstring.h" 28#include "libavutil/opt.h" 29#include "libavutil/log.h" 30 31#include "avformat.h" 32#include "internal.h" 33 34typedef struct ListEntry { 35 char name[1024]; 36 double duration; 37 struct ListEntry *next; 38} ListEntry; 39 40typedef struct HLSContext { 41 const AVClass *class; // Class for private options. 42 unsigned number; 43 int64_t sequence; 44 int64_t start_sequence; 45 AVOutputFormat *oformat; 46 AVFormatContext *avf; 47 float time; // Set by a private option. 48 int size; // Set by a private option. 49 int wrap; // Set by a private option. 50 int64_t recording_time; 51 int has_video; 52 int64_t start_pts; 53 int64_t end_pts; 54 double duration; // last segment duration computed so far, in seconds 55 int nb_entries; 56 ListEntry *list; 57 ListEntry *end_list; 58 char *basename; 59 char *baseurl; 60 AVIOContext *pb; 61} HLSContext; 62 63static int hls_mux_init(AVFormatContext *s) 64{ 65 HLSContext *hls = s->priv_data; 66 AVFormatContext *oc; 67 int i; 68 69 hls->avf = oc = avformat_alloc_context(); 70 if (!oc) 71 return AVERROR(ENOMEM); 72 73 oc->oformat = hls->oformat; 74 oc->interrupt_callback = s->interrupt_callback; 75 av_dict_copy(&oc->metadata, s->metadata, 0); 76 77 for (i = 0; i < s->nb_streams; i++) { 78 AVStream *st; 79 if (!(st = avformat_new_stream(oc, NULL))) 80 return AVERROR(ENOMEM); 81 avcodec_copy_context(st->codec, s->streams[i]->codec); 82 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio; 83 } 84 85 return 0; 86} 87 88static int append_entry(HLSContext *hls, double duration) 89{ 90 ListEntry *en = av_malloc(sizeof(*en)); 91 92 if (!en) 93 return AVERROR(ENOMEM); 94 95 av_strlcpy(en->name, av_basename(hls->avf->filename), sizeof(en->name)); 96 97 en->duration = duration; 98 en->next = NULL; 99 100 if (!hls->list) 101 hls->list = en; 102 else 103 hls->end_list->next = en; 104 105 hls->end_list = en; 106 107 if (hls->size && hls->nb_entries >= hls->size) { 108 en = hls->list; 109 hls->list = en->next; 110 av_free(en); 111 } else 112 hls->nb_entries++; 113 114 hls->sequence++; 115 116 return 0; 117} 118 119static void free_entries(HLSContext *hls) 120{ 121 ListEntry *p = hls->list, *en; 122 123 while(p) { 124 en = p; 125 p = p->next; 126 av_free(en); 127 } 128} 129 130static int hls_window(AVFormatContext *s, int last) 131{ 132 HLSContext *hls = s->priv_data; 133 ListEntry *en; 134 int target_duration = 0; 135 int ret = 0; 136 int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries); 137 138 if ((ret = avio_open2(&hls->pb, s->filename, AVIO_FLAG_WRITE, 139 &s->interrupt_callback, NULL)) < 0) 140 goto fail; 141 142 for (en = hls->list; en; en = en->next) { 143 if (target_duration < en->duration) 144 target_duration = ceil(en->duration); 145 } 146 147 avio_printf(hls->pb, "#EXTM3U\n"); 148 avio_printf(hls->pb, "#EXT-X-VERSION:3\n"); 149 avio_printf(hls->pb, "#EXT-X-TARGETDURATION:%d\n", target_duration); 150 avio_printf(hls->pb, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence); 151 152 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", 153 sequence); 154 155 for (en = hls->list; en; en = en->next) { 156 avio_printf(hls->pb, "#EXTINF:%f,\n", en->duration); 157 if (hls->baseurl) 158 avio_printf(hls->pb, "%s", hls->baseurl); 159 avio_printf(hls->pb, "%s\n", en->name); 160 } 161 162 if (last) 163 avio_printf(hls->pb, "#EXT-X-ENDLIST\n"); 164 165fail: 166 avio_closep(&hls->pb); 167 return ret; 168} 169 170static int hls_start(AVFormatContext *s) 171{ 172 HLSContext *c = s->priv_data; 173 AVFormatContext *oc = c->avf; 174 int err = 0; 175 176 if (av_get_frame_filename(oc->filename, sizeof(oc->filename), 177 c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) { 178 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename); 179 return AVERROR(EINVAL); 180 } 181 c->number++; 182 183 if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE, 184 &s->interrupt_callback, NULL)) < 0) 185 return err; 186 187 if (oc->oformat->priv_class && oc->priv_data) 188 av_opt_set(oc->priv_data, "mpegts_flags", "resend_headers", 0); 189 190 return 0; 191} 192 193static int hls_write_header(AVFormatContext *s) 194{ 195 HLSContext *hls = s->priv_data; 196 int ret, i; 197 char *p; 198 const char *pattern = "%d.ts"; 199 int basename_size = strlen(s->filename) + strlen(pattern) + 1; 200 201 hls->sequence = hls->start_sequence; 202 hls->recording_time = hls->time * AV_TIME_BASE; 203 hls->start_pts = AV_NOPTS_VALUE; 204 205 for (i = 0; i < s->nb_streams; i++) 206 hls->has_video += 207 s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO; 208 209 if (hls->has_video > 1) 210 av_log(s, AV_LOG_WARNING, 211 "More than a single video stream present, " 212 "expect issues decoding it.\n"); 213 214 hls->oformat = av_guess_format("mpegts", NULL, NULL); 215 216 if (!hls->oformat) { 217 ret = AVERROR_MUXER_NOT_FOUND; 218 goto fail; 219 } 220 221 hls->basename = av_malloc(basename_size); 222 223 if (!hls->basename) { 224 ret = AVERROR(ENOMEM); 225 goto fail; 226 } 227 228 strcpy(hls->basename, s->filename); 229 230 p = strrchr(hls->basename, '.'); 231 232 if (p) 233 *p = '\0'; 234 235 av_strlcat(hls->basename, pattern, basename_size); 236 237 if ((ret = hls_mux_init(s)) < 0) 238 goto fail; 239 240 if ((ret = hls_start(s)) < 0) 241 goto fail; 242 243 if ((ret = avformat_write_header(hls->avf, NULL)) < 0) 244 return ret; 245 246 247fail: 248 if (ret) { 249 av_free(hls->basename); 250 if (hls->avf) 251 avformat_free_context(hls->avf); 252 } 253 return ret; 254} 255 256static int hls_write_packet(AVFormatContext *s, AVPacket *pkt) 257{ 258 HLSContext *hls = s->priv_data; 259 AVFormatContext *oc = hls->avf; 260 AVStream *st = s->streams[pkt->stream_index]; 261 int64_t end_pts = hls->recording_time * hls->number; 262 int is_ref_pkt = 1; 263 int ret, can_split = 1; 264 265 if (hls->start_pts == AV_NOPTS_VALUE) { 266 hls->start_pts = pkt->pts; 267 hls->end_pts = pkt->pts; 268 } 269 270 if (hls->has_video) { 271 can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && 272 pkt->flags & AV_PKT_FLAG_KEY; 273 is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO; 274 } 275 if (pkt->pts == AV_NOPTS_VALUE) 276 is_ref_pkt = can_split = 0; 277 278 if (is_ref_pkt) 279 hls->duration = (double)(pkt->pts - hls->end_pts) 280 * st->time_base.num / st->time_base.den; 281 282 if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base, 283 end_pts, AV_TIME_BASE_Q) >= 0) { 284 ret = append_entry(hls, hls->duration); 285 if (ret) 286 return ret; 287 288 hls->end_pts = pkt->pts; 289 hls->duration = 0; 290 291 av_write_frame(oc, NULL); /* Flush any buffered data */ 292 avio_close(oc->pb); 293 294 ret = hls_start(s); 295 296 if (ret) 297 return ret; 298 299 oc = hls->avf; 300 301 if ((ret = hls_window(s, 0)) < 0) 302 return ret; 303 } 304 305 ret = ff_write_chained(oc, pkt->stream_index, pkt, s); 306 307 return ret; 308} 309 310static int hls_write_trailer(struct AVFormatContext *s) 311{ 312 HLSContext *hls = s->priv_data; 313 AVFormatContext *oc = hls->avf; 314 315 av_write_trailer(oc); 316 avio_closep(&oc->pb); 317 avformat_free_context(oc); 318 av_free(hls->basename); 319 append_entry(hls, hls->duration); 320 hls_window(s, 1); 321 322 free_entries(hls); 323 avio_close(hls->pb); 324 return 0; 325} 326 327#define OFFSET(x) offsetof(HLSContext, x) 328#define E AV_OPT_FLAG_ENCODING_PARAM 329static const AVOption options[] = { 330 {"start_number", "set first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E}, 331 {"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E}, 332 {"hls_list_size", "set maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E}, 333 {"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E}, 334 {"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E}, 335 { NULL }, 336}; 337 338static const AVClass hls_class = { 339 .class_name = "hls muxer", 340 .item_name = av_default_item_name, 341 .option = options, 342 .version = LIBAVUTIL_VERSION_INT, 343}; 344 345 346AVOutputFormat ff_hls_muxer = { 347 .name = "hls", 348 .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), 349 .extensions = "m3u8", 350 .priv_data_size = sizeof(HLSContext), 351 .audio_codec = AV_CODEC_ID_AAC, 352 .video_codec = AV_CODEC_ID_H264, 353 .flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH, 354 .write_header = hls_write_header, 355 .write_packet = hls_write_packet, 356 .write_trailer = hls_write_trailer, 357 .priv_class = &hls_class, 358}; 359