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/libavformat/segment.c

http://github.com/FFmpeg/FFmpeg
C | 1135 lines | 953 code | 146 blank | 36 comment | 226 complexity | 9c7d381eab4c0ab0e701aa845b7e6300 MD5 | raw file
   1/*
   2 * Copyright (c) 2011, Luca Barbato
   3 *
   4 * This file is part of FFmpeg.
   5 *
   6 * FFmpeg is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2.1 of the License, or (at your option) any later version.
  10 *
  11 * FFmpeg is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with FFmpeg; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19 */
  20
  21/**
  22 * @file generic segmenter
  23 * M3U8 specification can be find here:
  24 * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
  25 */
  26
  27#include <float.h>
  28#include <time.h>
  29
  30#include "avformat.h"
  31#include "avio_internal.h"
  32#include "internal.h"
  33
  34#include "libavutil/avassert.h"
  35#include "libavutil/internal.h"
  36#include "libavutil/log.h"
  37#include "libavutil/opt.h"
  38#include "libavutil/avstring.h"
  39#include "libavutil/parseutils.h"
  40#include "libavutil/mathematics.h"
  41#include "libavutil/time.h"
  42#include "libavutil/timecode.h"
  43#include "libavutil/time_internal.h"
  44#include "libavutil/timestamp.h"
  45
  46typedef struct SegmentListEntry {
  47    int index;
  48    double start_time, end_time;
  49    int64_t start_pts;
  50    int64_t offset_pts;
  51    char *filename;
  52    struct SegmentListEntry *next;
  53    int64_t last_duration;
  54} SegmentListEntry;
  55
  56typedef enum {
  57    LIST_TYPE_UNDEFINED = -1,
  58    LIST_TYPE_FLAT = 0,
  59    LIST_TYPE_CSV,
  60    LIST_TYPE_M3U8,
  61    LIST_TYPE_EXT, ///< deprecated
  62    LIST_TYPE_FFCONCAT,
  63    LIST_TYPE_NB,
  64} ListType;
  65
  66#define SEGMENT_LIST_FLAG_CACHE 1
  67#define SEGMENT_LIST_FLAG_LIVE  2
  68
  69typedef struct SegmentContext {
  70    const AVClass *class;  /**< Class for private options. */
  71    int segment_idx;       ///< index of the segment file to write, starting from 0
  72    int segment_idx_wrap;  ///< number after which the index wraps
  73    int segment_idx_wrap_nb;  ///< number of time the index has wraped
  74    int segment_count;     ///< number of segment files already written
  75    ff_const59 AVOutputFormat *oformat;
  76    AVFormatContext *avf;
  77    char *format;              ///< format to use for output segment files
  78    AVDictionary *format_options;
  79    char *list;            ///< filename for the segment list file
  80    int   list_flags;      ///< flags affecting list generation
  81    int   list_size;       ///< number of entries for the segment list file
  82
  83    int use_clocktime;    ///< flag to cut segments at regular clock time
  84    int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
  85    int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
  86    int64_t last_val;      ///< remember last time for wrap around detection
  87    int cut_pending;
  88    int header_written;    ///< whether we've already called avformat_write_header
  89
  90    char *entry_prefix;    ///< prefix to add to list entry filenames
  91    int list_type;         ///< set the list type
  92    AVIOContext *list_pb;  ///< list file put-byte context
  93    char *time_str;        ///< segment duration specification string
  94    int64_t time;          ///< segment duration
  95    int use_strftime;      ///< flag to expand filename with strftime
  96    int increment_tc;      ///< flag to increment timecode if found
  97
  98    char *times_str;       ///< segment times specification string
  99    int64_t *times;        ///< list of segment interval specification
 100    int nb_times;          ///< number of elments in the times array
 101
 102    char *frames_str;      ///< segment frame numbers specification string
 103    int *frames;           ///< list of frame number specification
 104    int nb_frames;         ///< number of elments in the frames array
 105    int frame_count;       ///< total number of reference frames
 106    int segment_frame_count; ///< number of reference frames in the segment
 107
 108    int64_t time_delta;
 109    int  individual_header_trailer; /**< Set by a private option. */
 110    int  write_header_trailer; /**< Set by a private option. */
 111    char *header_filename;  ///< filename to write the output header to
 112
 113    int reset_timestamps;  ///< reset timestamps at the beginning of each segment
 114    int64_t initial_offset;    ///< initial timestamps offset, expressed in microseconds
 115    char *reference_stream_specifier; ///< reference stream specifier
 116    int   reference_stream_index;
 117    int   break_non_keyframes;
 118    int   write_empty;
 119
 120    int use_rename;
 121    char temp_list_filename[1024];
 122
 123    SegmentListEntry cur_entry;
 124    SegmentListEntry *segment_list_entries;
 125    SegmentListEntry *segment_list_entries_end;
 126} SegmentContext;
 127
 128static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
 129{
 130    int needs_quoting = !!str[strcspn(str, "\",\n\r")];
 131
 132    if (needs_quoting)
 133        avio_w8(ctx, '"');
 134
 135    for (; *str; str++) {
 136        if (*str == '"')
 137            avio_w8(ctx, '"');
 138        avio_w8(ctx, *str);
 139    }
 140    if (needs_quoting)
 141        avio_w8(ctx, '"');
 142}
 143
 144static int segment_mux_init(AVFormatContext *s)
 145{
 146    SegmentContext *seg = s->priv_data;
 147    AVFormatContext *oc;
 148    int i;
 149    int ret;
 150
 151    ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
 152    if (ret < 0)
 153        return ret;
 154    oc = seg->avf;
 155
 156    oc->interrupt_callback = s->interrupt_callback;
 157    oc->max_delay          = s->max_delay;
 158    av_dict_copy(&oc->metadata, s->metadata, 0);
 159    oc->opaque             = s->opaque;
 160    oc->io_close           = s->io_close;
 161    oc->io_open            = s->io_open;
 162    oc->flags              = s->flags;
 163
 164    for (i = 0; i < s->nb_streams; i++) {
 165        AVStream *st;
 166        AVCodecParameters *ipar, *opar;
 167
 168        if (!(st = avformat_new_stream(oc, NULL)))
 169            return AVERROR(ENOMEM);
 170        ipar = s->streams[i]->codecpar;
 171        opar = st->codecpar;
 172        avcodec_parameters_copy(opar, ipar);
 173        if (!oc->oformat->codec_tag ||
 174            av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
 175            av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
 176            opar->codec_tag = ipar->codec_tag;
 177        } else {
 178            opar->codec_tag = 0;
 179        }
 180        st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
 181        st->time_base = s->streams[i]->time_base;
 182        st->avg_frame_rate = s->streams[i]->avg_frame_rate;
 183#if FF_API_LAVF_AVCTX
 184FF_DISABLE_DEPRECATION_WARNINGS
 185        if (s->streams[i]->codecpar->codec_tag == MKTAG('t','m','c','d'))
 186            st->codec->time_base = s->streams[i]->codec->time_base;
 187FF_ENABLE_DEPRECATION_WARNINGS
 188#endif
 189        av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
 190    }
 191
 192    return 0;
 193}
 194
 195static int set_segment_filename(AVFormatContext *s)
 196{
 197    SegmentContext *seg = s->priv_data;
 198    AVFormatContext *oc = seg->avf;
 199    size_t size;
 200    int ret;
 201    char buf[1024];
 202    char *new_name;
 203
 204    if (seg->segment_idx_wrap)
 205        seg->segment_idx %= seg->segment_idx_wrap;
 206    if (seg->use_strftime) {
 207        time_t now0;
 208        struct tm *tm, tmpbuf;
 209        time(&now0);
 210        tm = localtime_r(&now0, &tmpbuf);
 211        if (!strftime(buf, sizeof(buf), s->url, tm)) {
 212            av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
 213            return AVERROR(EINVAL);
 214        }
 215    } else if (av_get_frame_filename(buf, sizeof(buf),
 216                                     s->url, seg->segment_idx) < 0) {
 217        av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->url);
 218        return AVERROR(EINVAL);
 219    }
 220    new_name = av_strdup(buf);
 221    if (!new_name)
 222        return AVERROR(ENOMEM);
 223    ff_format_set_url(oc, new_name);
 224
 225    /* copy modified name in list entry */
 226    size = strlen(av_basename(oc->url)) + 1;
 227    if (seg->entry_prefix)
 228        size += strlen(seg->entry_prefix);
 229
 230    if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
 231        return ret;
 232    snprintf(seg->cur_entry.filename, size, "%s%s",
 233             seg->entry_prefix ? seg->entry_prefix : "",
 234             av_basename(oc->url));
 235
 236    return 0;
 237}
 238
 239static int segment_start(AVFormatContext *s, int write_header)
 240{
 241    SegmentContext *seg = s->priv_data;
 242    AVFormatContext *oc = seg->avf;
 243    int err = 0;
 244
 245    if (write_header) {
 246        avformat_free_context(oc);
 247        seg->avf = NULL;
 248        if ((err = segment_mux_init(s)) < 0)
 249            return err;
 250        oc = seg->avf;
 251    }
 252
 253    seg->segment_idx++;
 254    if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
 255        seg->segment_idx_wrap_nb++;
 256
 257    if ((err = set_segment_filename(s)) < 0)
 258        return err;
 259
 260    if ((err = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0) {
 261        av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
 262        return err;
 263    }
 264    if (!seg->individual_header_trailer)
 265        oc->pb->seekable = 0;
 266
 267    if (oc->oformat->priv_class && oc->priv_data)
 268        av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
 269
 270    if (write_header) {
 271        AVDictionary *options = NULL;
 272        av_dict_copy(&options, seg->format_options, 0);
 273        av_dict_set(&options, "fflags", "-autobsf", 0);
 274        err = avformat_write_header(oc, &options);
 275        av_dict_free(&options);
 276        if (err < 0)
 277            return err;
 278    }
 279
 280    seg->segment_frame_count = 0;
 281    return 0;
 282}
 283
 284static int segment_list_open(AVFormatContext *s)
 285{
 286    SegmentContext *seg = s->priv_data;
 287    int ret;
 288
 289    snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
 290    ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
 291    if (ret < 0) {
 292        av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
 293        return ret;
 294    }
 295
 296    if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
 297        SegmentListEntry *entry;
 298        double max_duration = 0;
 299
 300        avio_printf(seg->list_pb, "#EXTM3U\n");
 301        avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
 302        avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
 303        avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
 304                    seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
 305
 306        av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
 307               seg->segment_list_entries->index);
 308
 309        for (entry = seg->segment_list_entries; entry; entry = entry->next)
 310            max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
 311        avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
 312    } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
 313        avio_printf(seg->list_pb, "ffconcat version 1.0\n");
 314    }
 315
 316    return ret;
 317}
 318
 319static void segment_list_print_entry(AVIOContext      *list_ioctx,
 320                                     ListType          list_type,
 321                                     const SegmentListEntry *list_entry,
 322                                     void *log_ctx)
 323{
 324    switch (list_type) {
 325    case LIST_TYPE_FLAT:
 326        avio_printf(list_ioctx, "%s\n", list_entry->filename);
 327        break;
 328    case LIST_TYPE_CSV:
 329    case LIST_TYPE_EXT:
 330        print_csv_escaped_str(list_ioctx, list_entry->filename);
 331        avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
 332        break;
 333    case LIST_TYPE_M3U8:
 334        avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
 335                    list_entry->end_time - list_entry->start_time, list_entry->filename);
 336        break;
 337    case LIST_TYPE_FFCONCAT:
 338    {
 339        char *buf;
 340        if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
 341            av_log(log_ctx, AV_LOG_WARNING,
 342                   "Error writing list entry '%s' in list file\n", list_entry->filename);
 343            return;
 344        }
 345        avio_printf(list_ioctx, "file %s\n", buf);
 346        av_free(buf);
 347        break;
 348    }
 349    default:
 350        av_assert0(!"Invalid list type");
 351    }
 352}
 353
 354static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
 355{
 356    SegmentContext *seg = s->priv_data;
 357    AVFormatContext *oc = seg->avf;
 358    int ret = 0;
 359    AVTimecode tc;
 360    AVRational rate;
 361    AVDictionaryEntry *tcr;
 362    char buf[AV_TIMECODE_STR_SIZE];
 363    int i;
 364    int err;
 365
 366    if (!oc || !oc->pb)
 367        return AVERROR(EINVAL);
 368
 369    av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
 370    if (write_trailer)
 371        ret = av_write_trailer(oc);
 372
 373    if (ret < 0)
 374        av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
 375               oc->url);
 376
 377    if (seg->list) {
 378        if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
 379            SegmentListEntry *entry = av_mallocz(sizeof(*entry));
 380            if (!entry) {
 381                ret = AVERROR(ENOMEM);
 382                goto end;
 383            }
 384
 385            /* append new element */
 386            memcpy(entry, &seg->cur_entry, sizeof(*entry));
 387            entry->filename = av_strdup(entry->filename);
 388            if (!seg->segment_list_entries)
 389                seg->segment_list_entries = seg->segment_list_entries_end = entry;
 390            else
 391                seg->segment_list_entries_end->next = entry;
 392            seg->segment_list_entries_end = entry;
 393
 394            /* drop first item */
 395            if (seg->list_size && seg->segment_count >= seg->list_size) {
 396                entry = seg->segment_list_entries;
 397                seg->segment_list_entries = seg->segment_list_entries->next;
 398                av_freep(&entry->filename);
 399                av_freep(&entry);
 400            }
 401
 402            if ((ret = segment_list_open(s)) < 0)
 403                goto end;
 404            for (entry = seg->segment_list_entries; entry; entry = entry->next)
 405                segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
 406            if (seg->list_type == LIST_TYPE_M3U8 && is_last)
 407                avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
 408            ff_format_io_close(s, &seg->list_pb);
 409            if (seg->use_rename)
 410                ff_rename(seg->temp_list_filename, seg->list, s);
 411        } else {
 412            segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
 413            avio_flush(seg->list_pb);
 414        }
 415    }
 416
 417    av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
 418           seg->avf->url, seg->segment_count);
 419    seg->segment_count++;
 420
 421    if (seg->increment_tc) {
 422        tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
 423        if (tcr) {
 424            /* search the first video stream */
 425            for (i = 0; i < s->nb_streams; i++) {
 426                if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 427                    rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
 428                    err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
 429                    if (err < 0) {
 430                        av_log(s, AV_LOG_WARNING, "Could not increment global timecode, error occurred during timecode creation.\n");
 431                        break;
 432                    }
 433                    tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
 434                    av_dict_set(&s->metadata, "timecode",
 435                                av_timecode_make_string(&tc, buf, 0), 0);
 436                    break;
 437                }
 438            }
 439        } else {
 440            av_log(s, AV_LOG_WARNING, "Could not increment global timecode, no global timecode metadata found.\n");
 441        }
 442        for (i = 0; i < s->nb_streams; i++) {
 443            if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 444                char st_buf[AV_TIMECODE_STR_SIZE];
 445                AVTimecode st_tc;
 446                AVRational st_rate = s->streams[i]->avg_frame_rate;
 447                AVDictionaryEntry *st_tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
 448                if (st_tcr) {
 449                    if ((av_timecode_init_from_string(&st_tc, st_rate, st_tcr->value, s) < 0)) {
 450                        av_log(s, AV_LOG_WARNING, "Could not increment stream %d timecode, error occurred during timecode creation.\n", i);
 451                        continue;
 452                    }
 453                st_tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(st_rate));    // increment timecode
 454                av_dict_set(&s->streams[i]->metadata, "timecode", av_timecode_make_string(&st_tc, st_buf, 0), 0);
 455                }
 456            }
 457        }
 458    }
 459
 460end:
 461    ff_format_io_close(oc, &oc->pb);
 462
 463    return ret;
 464}
 465
 466static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
 467                       const char *times_str)
 468{
 469    char *p;
 470    int i, ret = 0;
 471    char *times_str1 = av_strdup(times_str);
 472    char *saveptr = NULL;
 473
 474    if (!times_str1)
 475        return AVERROR(ENOMEM);
 476
 477#define FAIL(err) ret = err; goto end
 478
 479    *nb_times = 1;
 480    for (p = times_str1; *p; p++)
 481        if (*p == ',')
 482            (*nb_times)++;
 483
 484    *times = av_malloc_array(*nb_times, sizeof(**times));
 485    if (!*times) {
 486        av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
 487        FAIL(AVERROR(ENOMEM));
 488    }
 489
 490    p = times_str1;
 491    for (i = 0; i < *nb_times; i++) {
 492        int64_t t;
 493        char *tstr = av_strtok(p, ",", &saveptr);
 494        p = NULL;
 495
 496        if (!tstr || !tstr[0]) {
 497            av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
 498                   times_str);
 499            FAIL(AVERROR(EINVAL));
 500        }
 501
 502        ret = av_parse_time(&t, tstr, 1);
 503        if (ret < 0) {
 504            av_log(log_ctx, AV_LOG_ERROR,
 505                   "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
 506            FAIL(AVERROR(EINVAL));
 507        }
 508        (*times)[i] = t;
 509
 510        /* check on monotonicity */
 511        if (i && (*times)[i-1] > (*times)[i]) {
 512            av_log(log_ctx, AV_LOG_ERROR,
 513                   "Specified time %f is greater than the following time %f\n",
 514                   (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
 515            FAIL(AVERROR(EINVAL));
 516        }
 517    }
 518
 519end:
 520    av_free(times_str1);
 521    return ret;
 522}
 523
 524static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
 525                        const char *frames_str)
 526{
 527    char *p;
 528    int i, ret = 0;
 529    char *frames_str1 = av_strdup(frames_str);
 530    char *saveptr = NULL;
 531
 532    if (!frames_str1)
 533        return AVERROR(ENOMEM);
 534
 535#define FAIL(err) ret = err; goto end
 536
 537    *nb_frames = 1;
 538    for (p = frames_str1; *p; p++)
 539        if (*p == ',')
 540            (*nb_frames)++;
 541
 542    *frames = av_malloc_array(*nb_frames, sizeof(**frames));
 543    if (!*frames) {
 544        av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
 545        FAIL(AVERROR(ENOMEM));
 546    }
 547
 548    p = frames_str1;
 549    for (i = 0; i < *nb_frames; i++) {
 550        long int f;
 551        char *tailptr;
 552        char *fstr = av_strtok(p, ",", &saveptr);
 553
 554        p = NULL;
 555        if (!fstr) {
 556            av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
 557                   frames_str);
 558            FAIL(AVERROR(EINVAL));
 559        }
 560        f = strtol(fstr, &tailptr, 10);
 561        if (*tailptr || f <= 0 || f >= INT_MAX) {
 562            av_log(log_ctx, AV_LOG_ERROR,
 563                   "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
 564                   fstr);
 565            FAIL(AVERROR(EINVAL));
 566        }
 567        (*frames)[i] = f;
 568
 569        /* check on monotonicity */
 570        if (i && (*frames)[i-1] > (*frames)[i]) {
 571            av_log(log_ctx, AV_LOG_ERROR,
 572                   "Specified frame %d is greater than the following frame %d\n",
 573                   (*frames)[i], (*frames)[i-1]);
 574            FAIL(AVERROR(EINVAL));
 575        }
 576    }
 577
 578end:
 579    av_free(frames_str1);
 580    return ret;
 581}
 582
 583static int open_null_ctx(AVIOContext **ctx)
 584{
 585    int buf_size = 32768;
 586    uint8_t *buf = av_malloc(buf_size);
 587    if (!buf)
 588        return AVERROR(ENOMEM);
 589    *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
 590    if (!*ctx) {
 591        av_free(buf);
 592        return AVERROR(ENOMEM);
 593    }
 594    return 0;
 595}
 596
 597static void close_null_ctxp(AVIOContext **pb)
 598{
 599    av_freep(&(*pb)->buffer);
 600    avio_context_free(pb);
 601}
 602
 603static int select_reference_stream(AVFormatContext *s)
 604{
 605    SegmentContext *seg = s->priv_data;
 606    int ret, i;
 607
 608    seg->reference_stream_index = -1;
 609    if (!strcmp(seg->reference_stream_specifier, "auto")) {
 610        /* select first index of type with highest priority */
 611        int type_index_map[AVMEDIA_TYPE_NB];
 612        static const enum AVMediaType type_priority_list[] = {
 613            AVMEDIA_TYPE_VIDEO,
 614            AVMEDIA_TYPE_AUDIO,
 615            AVMEDIA_TYPE_SUBTITLE,
 616            AVMEDIA_TYPE_DATA,
 617            AVMEDIA_TYPE_ATTACHMENT
 618        };
 619        enum AVMediaType type;
 620
 621        for (i = 0; i < AVMEDIA_TYPE_NB; i++)
 622            type_index_map[i] = -1;
 623
 624        /* select first index for each type */
 625        for (i = 0; i < s->nb_streams; i++) {
 626            type = s->streams[i]->codecpar->codec_type;
 627            if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
 628                /* ignore attached pictures/cover art streams */
 629                && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
 630                type_index_map[type] = i;
 631        }
 632
 633        for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
 634            type = type_priority_list[i];
 635            if ((seg->reference_stream_index = type_index_map[type]) >= 0)
 636                break;
 637        }
 638    } else {
 639        for (i = 0; i < s->nb_streams; i++) {
 640            ret = avformat_match_stream_specifier(s, s->streams[i],
 641                                                  seg->reference_stream_specifier);
 642            if (ret < 0)
 643                return ret;
 644            if (ret > 0) {
 645                seg->reference_stream_index = i;
 646                break;
 647            }
 648        }
 649    }
 650
 651    if (seg->reference_stream_index < 0) {
 652        av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
 653               seg->reference_stream_specifier);
 654        return AVERROR(EINVAL);
 655    }
 656
 657    return 0;
 658}
 659
 660static void seg_free(AVFormatContext *s)
 661{
 662    SegmentContext *seg = s->priv_data;
 663    ff_format_io_close(seg->avf, &seg->list_pb);
 664    avformat_free_context(seg->avf);
 665    seg->avf = NULL;
 666}
 667
 668static int seg_init(AVFormatContext *s)
 669{
 670    SegmentContext *seg = s->priv_data;
 671    AVFormatContext *oc = seg->avf;
 672    AVDictionary *options = NULL;
 673    int ret;
 674    int i;
 675
 676    seg->segment_count = 0;
 677    if (!seg->write_header_trailer)
 678        seg->individual_header_trailer = 0;
 679
 680    if (seg->header_filename) {
 681        seg->write_header_trailer = 1;
 682        seg->individual_header_trailer = 0;
 683    }
 684
 685    if (seg->initial_offset > 0) {
 686        av_log(s, AV_LOG_WARNING, "NOTE: the option initial_offset is deprecated,"
 687               "you can use output_ts_offset instead of it\n");
 688    }
 689
 690    if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
 691        av_log(s, AV_LOG_ERROR,
 692               "segment_time, segment_times, and segment_frames options "
 693               "are mutually exclusive, select just one of them\n");
 694        return AVERROR(EINVAL);
 695    }
 696
 697    if (seg->times_str) {
 698        if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
 699            return ret;
 700    } else if (seg->frames_str) {
 701        if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
 702            return ret;
 703    } else {
 704        /* set default value if not specified */
 705        if (!seg->time_str)
 706            seg->time_str = av_strdup("2");
 707        if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
 708            av_log(s, AV_LOG_ERROR,
 709                   "Invalid time duration specification '%s' for segment_time option\n",
 710                   seg->time_str);
 711            return ret;
 712        }
 713        if (seg->use_clocktime) {
 714            if (seg->time <= 0) {
 715                av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
 716                return AVERROR(EINVAL);
 717            }
 718            seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
 719        }
 720    }
 721
 722    if (seg->list) {
 723        if (seg->list_type == LIST_TYPE_UNDEFINED) {
 724            if      (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
 725            else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
 726            else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
 727            else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
 728            else                                      seg->list_type = LIST_TYPE_FLAT;
 729        }
 730        if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
 731            if ((ret = segment_list_open(s)) < 0)
 732                return ret;
 733        } else {
 734            const char *proto = avio_find_protocol_name(seg->list);
 735            seg->use_rename = proto && !strcmp(proto, "file");
 736        }
 737    }
 738
 739    if (seg->list_type == LIST_TYPE_EXT)
 740        av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
 741
 742    if ((ret = select_reference_stream(s)) < 0)
 743        return ret;
 744    av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
 745           seg->reference_stream_index,
 746           av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
 747
 748    seg->oformat = av_guess_format(seg->format, s->url, NULL);
 749
 750    if (!seg->oformat)
 751        return AVERROR_MUXER_NOT_FOUND;
 752    if (seg->oformat->flags & AVFMT_NOFILE) {
 753        av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
 754               seg->oformat->name);
 755        return AVERROR(EINVAL);
 756    }
 757
 758    if ((ret = segment_mux_init(s)) < 0)
 759        return ret;
 760
 761    if ((ret = set_segment_filename(s)) < 0)
 762        return ret;
 763    oc = seg->avf;
 764
 765    if (seg->write_header_trailer) {
 766        if ((ret = s->io_open(s, &oc->pb,
 767                              seg->header_filename ? seg->header_filename : oc->url,
 768                              AVIO_FLAG_WRITE, NULL)) < 0) {
 769            av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
 770            return ret;
 771        }
 772        if (!seg->individual_header_trailer)
 773            oc->pb->seekable = 0;
 774    } else {
 775        if ((ret = open_null_ctx(&oc->pb)) < 0)
 776            return ret;
 777    }
 778
 779    av_dict_copy(&options, seg->format_options, 0);
 780    av_dict_set(&options, "fflags", "-autobsf", 0);
 781    ret = avformat_init_output(oc, &options);
 782    if (av_dict_count(options)) {
 783        av_log(s, AV_LOG_ERROR,
 784               "Some of the provided format options are not recognized\n");
 785        av_dict_free(&options);
 786        return AVERROR(EINVAL);
 787    }
 788    av_dict_free(&options);
 789
 790    if (ret < 0) {
 791        ff_format_io_close(oc, &oc->pb);
 792        return ret;
 793    }
 794    seg->segment_frame_count = 0;
 795
 796    av_assert0(s->nb_streams == oc->nb_streams);
 797    if (ret == AVSTREAM_INIT_IN_WRITE_HEADER) {
 798        ret = avformat_write_header(oc, NULL);
 799        if (ret < 0)
 800            return ret;
 801        seg->header_written = 1;
 802    }
 803
 804    for (i = 0; i < s->nb_streams; i++) {
 805        AVStream *inner_st  = oc->streams[i];
 806        AVStream *outer_st = s->streams[i];
 807        avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
 808    }
 809
 810    if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
 811        s->avoid_negative_ts = 1;
 812
 813    return ret;
 814}
 815
 816static int seg_write_header(AVFormatContext *s)
 817{
 818    SegmentContext *seg = s->priv_data;
 819    AVFormatContext *oc = seg->avf;
 820    int ret, i;
 821
 822    if (!seg->header_written) {
 823        for (i = 0; i < s->nb_streams; i++) {
 824            AVStream *st = oc->streams[i];
 825            AVCodecParameters *ipar, *opar;
 826
 827            ipar = s->streams[i]->codecpar;
 828            opar = oc->streams[i]->codecpar;
 829            avcodec_parameters_copy(opar, ipar);
 830            if (!oc->oformat->codec_tag ||
 831                av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
 832                av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
 833                opar->codec_tag = ipar->codec_tag;
 834            } else {
 835                opar->codec_tag = 0;
 836            }
 837            st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
 838            st->time_base = s->streams[i]->time_base;
 839        }
 840        ret = avformat_write_header(oc, NULL);
 841        if (ret < 0)
 842            return ret;
 843    }
 844
 845    if (!seg->write_header_trailer || seg->header_filename) {
 846        if (seg->header_filename) {
 847            av_write_frame(oc, NULL);
 848            ff_format_io_close(oc, &oc->pb);
 849        } else {
 850            close_null_ctxp(&oc->pb);
 851        }
 852        if ((ret = oc->io_open(oc, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0)
 853            return ret;
 854        if (!seg->individual_header_trailer)
 855            oc->pb->seekable = 0;
 856    }
 857
 858    return 0;
 859}
 860
 861static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
 862{
 863    SegmentContext *seg = s->priv_data;
 864    AVStream *st = s->streams[pkt->stream_index];
 865    int64_t end_pts = INT64_MAX, offset;
 866    int start_frame = INT_MAX;
 867    int ret;
 868    struct tm ti;
 869    int64_t usecs;
 870    int64_t wrapped_val;
 871
 872    if (!seg->avf || !seg->avf->pb)
 873        return AVERROR(EINVAL);
 874
 875    if (!st->codecpar->extradata_size) {
 876        int pkt_extradata_size = 0;
 877        uint8_t *pkt_extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &pkt_extradata_size);
 878        if (pkt_extradata && pkt_extradata_size > 0) {
 879            ret = ff_alloc_extradata(st->codecpar, pkt_extradata_size);
 880            if (ret < 0) {
 881                av_log(s, AV_LOG_WARNING, "Unable to add extradata to stream. Output segments may be invalid.\n");
 882                goto calc_times;
 883            }
 884            memcpy(st->codecpar->extradata, pkt_extradata, pkt_extradata_size);
 885        }
 886    }
 887
 888calc_times:
 889    if (seg->times) {
 890        end_pts = seg->segment_count < seg->nb_times ?
 891            seg->times[seg->segment_count] : INT64_MAX;
 892    } else if (seg->frames) {
 893        start_frame = seg->segment_count < seg->nb_frames ?
 894            seg->frames[seg->segment_count] : INT_MAX;
 895    } else {
 896        if (seg->use_clocktime) {
 897            int64_t avgt = av_gettime();
 898            time_t sec = avgt / 1000000;
 899            localtime_r(&sec, &ti);
 900            usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
 901            wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
 902            if (wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration)
 903                seg->cut_pending = 1;
 904            seg->last_val = wrapped_val;
 905        } else {
 906            end_pts = seg->time * (seg->segment_count + 1);
 907        }
 908    }
 909
 910    ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
 911            pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
 912            av_ts2timestr(pkt->duration, &st->time_base),
 913            pkt->flags & AV_PKT_FLAG_KEY,
 914            pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
 915
 916    if (pkt->stream_index == seg->reference_stream_index &&
 917        (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
 918        (seg->segment_frame_count > 0 || seg->write_empty) &&
 919        (seg->cut_pending || seg->frame_count >= start_frame ||
 920         (pkt->pts != AV_NOPTS_VALUE &&
 921          av_compare_ts(pkt->pts, st->time_base,
 922                        end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
 923        /* sanitize end time in case last packet didn't have a defined duration */
 924        if (seg->cur_entry.last_duration == 0)
 925            seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
 926
 927        if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
 928            goto fail;
 929
 930        if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
 931            goto fail;
 932
 933        seg->cut_pending = 0;
 934        seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
 935        seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
 936        seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
 937        seg->cur_entry.end_time = seg->cur_entry.start_time;
 938
 939        if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
 940            goto calc_times;
 941    }
 942
 943    if (pkt->stream_index == seg->reference_stream_index) {
 944        if (pkt->pts != AV_NOPTS_VALUE)
 945            seg->cur_entry.end_time =
 946                FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
 947        seg->cur_entry.last_duration = pkt->duration;
 948    }
 949
 950    if (seg->segment_frame_count == 0) {
 951        av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
 952               seg->avf->url, pkt->stream_index,
 953               av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
 954    }
 955
 956    av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
 957           pkt->stream_index,
 958           av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
 959           av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
 960           av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
 961
 962    /* compute new timestamps */
 963    offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
 964                          AV_TIME_BASE_Q, st->time_base);
 965    if (pkt->pts != AV_NOPTS_VALUE)
 966        pkt->pts += offset;
 967    if (pkt->dts != AV_NOPTS_VALUE)
 968        pkt->dts += offset;
 969
 970    av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
 971           av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
 972           av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
 973
 974    ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s,
 975                           seg->initial_offset || seg->reset_timestamps || seg->avf->oformat->interleave_packet);
 976
 977fail:
 978    if (pkt->stream_index == seg->reference_stream_index) {
 979        seg->frame_count++;
 980        seg->segment_frame_count++;
 981    }
 982
 983    return ret;
 984}
 985
 986static int seg_write_trailer(struct AVFormatContext *s)
 987{
 988    SegmentContext *seg = s->priv_data;
 989    AVFormatContext *oc = seg->avf;
 990    SegmentListEntry *cur, *next;
 991    int ret = 0;
 992
 993    if (!oc)
 994        goto fail;
 995
 996    if (!seg->write_header_trailer) {
 997        if ((ret = segment_end(s, 0, 1)) < 0)
 998            goto fail;
 999        if ((ret = open_null_ctx(&oc->pb)) < 0)
1000            goto fail;
1001        ret = av_write_trailer(oc);
1002        close_null_ctxp(&oc->pb);
1003    } else {
1004        ret = segment_end(s, 1, 1);
1005    }
1006fail:
1007    if (seg->list)
1008        ff_format_io_close(s, &seg->list_pb);
1009
1010    av_opt_free(seg);
1011    av_freep(&seg->times);
1012    av_freep(&seg->frames);
1013    av_freep(&seg->cur_entry.filename);
1014
1015    cur = seg->segment_list_entries;
1016    while (cur) {
1017        next = cur->next;
1018        av_freep(&cur->filename);
1019        av_free(cur);
1020        cur = next;
1021    }
1022
1023    avformat_free_context(oc);
1024    seg->avf = NULL;
1025    return ret;
1026}
1027
1028static int seg_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
1029{
1030    SegmentContext *seg = s->priv_data;
1031    AVFormatContext *oc = seg->avf;
1032    if (oc->oformat->check_bitstream) {
1033        int ret = oc->oformat->check_bitstream(oc, pkt);
1034        if (ret == 1) {
1035            AVStream *st = s->streams[pkt->stream_index];
1036            AVStream *ost = oc->streams[pkt->stream_index];
1037            st->internal->bsfc = ost->internal->bsfc;
1038            ost->internal->bsfc = NULL;
1039        }
1040        return ret;
1041    }
1042    return 1;
1043}
1044
1045#define OFFSET(x) offsetof(SegmentContext, x)
1046#define E AV_OPT_FLAG_ENCODING_PARAM
1047static const AVOption options[] = {
1048    { "reference_stream",  "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, 0, 0, E },
1049    { "segment_format",    "set container format used for the segments", OFFSET(format),  AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
1050    { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
1051    { "segment_list",      "set the segment list filename",              OFFSET(list),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
1052    { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1053
1054    { "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},
1055    { "cache",             "allow list caching",                                    0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX,   E, "list_flags"},
1056    { "live",              "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX,    E, "list_flags"},
1057
1058    { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT,  {.i64 = 0},     0, INT_MAX, E },
1059
1060    { "segment_list_type", "set the segment list type",                  OFFSET(list_type), AV_OPT_TYPE_INT,  {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },
1061    { "flat", "flat format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
1062    { "csv",  "csv format",      0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV  }, INT_MIN, INT_MAX, E, "list_type" },
1063    { "ext",  "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT  }, INT_MIN, INT_MAX, E, "list_type" },
1064    { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
1065    { "m3u8", "M3U8 format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1066    { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1067
1068    { "segment_atclocktime",      "set segment to be cut at clocktime",  OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
1069    { "segment_clocktime_offset", "set segment clocktime offset",        OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
1070    { "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
1071    { "segment_time",      "set segment duration",                       OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
1072    { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, E },
1073    { "segment_times",     "set segment split time points",              OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
1074    { "segment_frames",    "set segment split frame numbers",            OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
1075    { "segment_wrap",      "set number after which the index wraps",     OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1076    { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING,  {.str = NULL}, 0, 0, E },
1077    { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1078    { "segment_wrap_number", "set the number of wrap before the first segment", OFFSET(segment_idx_wrap_nb), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1079    { "strftime",          "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1080    { "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1081    { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1082
1083    { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1084    { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1085    { "reset_timestamps", "reset timestamps at the beginning of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1086    { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
1087    { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1088    { NULL },
1089};
1090
1091#if CONFIG_SEGMENT_MUXER
1092static const AVClass seg_class = {
1093    .class_name = "segment muxer",
1094    .item_name  = av_default_item_name,
1095    .option     = options,
1096    .version    = LIBAVUTIL_VERSION_INT,
1097};
1098
1099AVOutputFormat ff_segment_muxer = {
1100    .name           = "segment",
1101    .long_name      = NULL_IF_CONFIG_SMALL("segment"),
1102    .priv_data_size = sizeof(SegmentContext),
1103    .flags          = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
1104    .init           = seg_init,
1105    .write_header   = seg_write_header,
1106    .write_packet   = seg_write_packet,
1107    .write_trailer  = seg_write_trailer,
1108    .deinit         = seg_free,
1109    .check_bitstream = seg_check_bitstream,
1110    .priv_class     = &seg_class,
1111};
1112#endif
1113
1114#if CONFIG_STREAM_SEGMENT_MUXER
1115static const AVClass sseg_class = {
1116    .class_name = "stream_segment muxer",
1117    .item_name  = av_default_item_name,
1118    .option     = options,
1119    .version    = LIBAVUTIL_VERSION_INT,
1120};
1121
1122AVOutputFormat ff_stream_segment_muxer = {
1123    .name           = "stream_segment,ssegment",
1124    .long_name      = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
1125    .priv_data_size = sizeof(SegmentContext),
1126    .flags          = AVFMT_NOFILE,
1127    .init           = seg_init,
1128    .write_header   = seg_write_header,
1129    .write_packet   = seg_write_packet,
1130    .write_trailer  = seg_write_trailer,
1131    .deinit         = seg_free,
1132    .check_bitstream = seg_check_bitstream,
1133    .priv_class     = &sseg_class,
1134};
1135#endif