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  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. /* #define DEBUG */
  28.  
  29. #include <float.h>
  30. #include <time.h>
  31.  
  32. #include "avformat.h"
  33. #include "internal.h"
  34.  
  35. #include "libavutil/avassert.h"
  36. #include "libavutil/internal.h"
  37. #include "libavutil/log.h"
  38. #include "libavutil/opt.h"
  39. #include "libavutil/avstring.h"
  40. #include "libavutil/parseutils.h"
  41. #include "libavutil/mathematics.h"
  42. #include "libavutil/time.h"
  43. #include "libavutil/time_internal.h"
  44. #include "libavutil/timestamp.h"
  45.  
  46. typedef 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.  
  56. typedef 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.  
  69. typedef 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.     AVOutputFormat *oformat;
  76.     AVFormatContext *avf;
  77.     char *format;              ///< format to use for output segment files
  78.     char *format_options_str;  ///< format options to use for output segment files
  79.     AVDictionary *format_options;
  80.     char *list;            ///< filename for the segment list file
  81.     int   list_flags;      ///< flags affecting list generation
  82.     int   list_size;       ///< number of entries for the segment list file
  83.  
  84.     int use_clocktime;    ///< flag to cut segments at regular clock time
  85.     int64_t last_val;      ///< remember last time for wrap around detection
  86.     int64_t last_cut;      ///< remember last cut
  87.     int cut_pending;
  88.  
  89.     char *entry_prefix;    ///< prefix to add to list entry filenames
  90.     int list_type;         ///< set the list type
  91.     AVIOContext *list_pb;  ///< list file put-byte context
  92.     char *time_str;        ///< segment duration specification string
  93.     int64_t time;          ///< segment duration
  94.     int use_strftime;      ///< flag to expand filename with strftime
  95.  
  96.     char *times_str;       ///< segment times specification string
  97.     int64_t *times;        ///< list of segment interval specification
  98.     int nb_times;          ///< number of elments in the times array
  99.  
  100.     char *frames_str;      ///< segment frame numbers specification string
  101.     int *frames;           ///< list of frame number specification
  102.     int nb_frames;         ///< number of elments in the frames array
  103.     int frame_count;       ///< total number of reference frames
  104.     int segment_frame_count; ///< number of reference frames in the segment
  105.  
  106.     int64_t time_delta;
  107.     int  individual_header_trailer; /**< Set by a private option. */
  108.     int  write_header_trailer; /**< Set by a private option. */
  109.     char *header_filename;  ///< filename to write the output header to
  110.  
  111.     int reset_timestamps;  ///< reset timestamps at the begin of each segment
  112.     int64_t initial_offset;    ///< initial timestamps offset, expressed in microseconds
  113.     char *reference_stream_specifier; ///< reference stream specifier
  114.     int   reference_stream_index;
  115.     int   break_non_keyframes;
  116.  
  117.     int use_rename;
  118.     char temp_list_filename[1024];
  119.  
  120.     SegmentListEntry cur_entry;
  121.     SegmentListEntry *segment_list_entries;
  122.     SegmentListEntry *segment_list_entries_end;
  123. } SegmentContext;
  124.  
  125. static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
  126. {
  127.     int needs_quoting = !!str[strcspn(str, "\",\n\r")];
  128.  
  129.     if (needs_quoting)
  130.         avio_w8(ctx, '"');
  131.  
  132.     for (; *str; str++) {
  133.         if (*str == '"')
  134.             avio_w8(ctx, '"');
  135.         avio_w8(ctx, *str);
  136.     }
  137.     if (needs_quoting)
  138.         avio_w8(ctx, '"');
  139. }
  140.  
  141. static int segment_mux_init(AVFormatContext *s)
  142. {
  143.     SegmentContext *seg = s->priv_data;
  144.     AVFormatContext *oc;
  145.     int i;
  146.     int ret;
  147.  
  148.     ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
  149.     if (ret < 0)
  150.         return ret;
  151.     oc = seg->avf;
  152.  
  153.     oc->interrupt_callback = s->interrupt_callback;
  154.     oc->max_delay          = s->max_delay;
  155.     av_dict_copy(&oc->metadata, s->metadata, 0);
  156.  
  157.     for (i = 0; i < s->nb_streams; i++) {
  158.         AVStream *st;
  159.         AVCodecContext *icodec, *ocodec;
  160.  
  161.         if (!(st = avformat_new_stream(oc, NULL)))
  162.             return AVERROR(ENOMEM);
  163.         icodec = s->streams[i]->codec;
  164.         ocodec = st->codec;
  165.         avcodec_copy_context(ocodec, icodec);
  166.         if (!oc->oformat->codec_tag ||
  167.             av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||
  168.             av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {
  169.             ocodec->codec_tag = icodec->codec_tag;
  170.         } else {
  171.             ocodec->codec_tag = 0;
  172.         }
  173.         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
  174.         st->time_base = s->streams[i]->time_base;
  175.         av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
  176.     }
  177.  
  178.     return 0;
  179. }
  180.  
  181. static int set_segment_filename(AVFormatContext *s)
  182. {
  183.     SegmentContext *seg = s->priv_data;
  184.     AVFormatContext *oc = seg->avf;
  185.     size_t size;
  186.  
  187.     if (seg->segment_idx_wrap)
  188.         seg->segment_idx %= seg->segment_idx_wrap;
  189.     if (seg->use_strftime) {
  190.         time_t now0;
  191.         struct tm *tm, tmpbuf;
  192.         time(&now0);
  193.         tm = localtime_r(&now0, &tmpbuf);
  194.         if (!strftime(oc->filename, sizeof(oc->filename), s->filename, tm)) {
  195.             av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
  196.             return AVERROR(EINVAL);
  197.         }
  198.     } else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
  199.                                      s->filename, seg->segment_idx) < 0) {
  200.         av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
  201.         return AVERROR(EINVAL);
  202.     }
  203.  
  204.     /* copy modified name in list entry */
  205.     size = strlen(av_basename(oc->filename)) + 1;
  206.     if (seg->entry_prefix)
  207.         size += strlen(seg->entry_prefix);
  208.  
  209.     seg->cur_entry.filename = av_mallocz(size);
  210.     if (!seg->cur_entry.filename)
  211.         return AVERROR(ENOMEM);
  212.     snprintf(seg->cur_entry.filename, size, "%s%s",
  213.              seg->entry_prefix ? seg->entry_prefix : "",
  214.              av_basename(oc->filename));
  215.  
  216.     return 0;
  217. }
  218.  
  219. static int segment_start(AVFormatContext *s, int write_header)
  220. {
  221.     SegmentContext *seg = s->priv_data;
  222.     AVFormatContext *oc = seg->avf;
  223.     int err = 0;
  224.  
  225.     if (write_header) {
  226.         avformat_free_context(oc);
  227.         seg->avf = NULL;
  228.         if ((err = segment_mux_init(s)) < 0)
  229.             return err;
  230.         oc = seg->avf;
  231.     }
  232.  
  233.     seg->segment_idx++;
  234.     if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
  235.         seg->segment_idx_wrap_nb++;
  236.  
  237.     if ((err = set_segment_filename(s)) < 0)
  238.         return err;
  239.  
  240.     if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
  241.                           &s->interrupt_callback, NULL)) < 0) {
  242.         av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
  243.         return err;
  244.     }
  245.     if (!seg->individual_header_trailer)
  246.         oc->pb->seekable = 0;
  247.  
  248.     if (oc->oformat->priv_class && oc->priv_data)
  249.         av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
  250.  
  251.     if (write_header) {
  252.         if ((err = avformat_write_header(oc, NULL)) < 0)
  253.             return err;
  254.     }
  255.  
  256.     seg->segment_frame_count = 0;
  257.     return 0;
  258. }
  259.  
  260. static int segment_list_open(AVFormatContext *s)
  261. {
  262.     SegmentContext *seg = s->priv_data;
  263.     int ret;
  264.  
  265.     snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
  266.     ret = avio_open2(&seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE,
  267.                      &s->interrupt_callback, NULL);
  268.     if (ret < 0) {
  269.         av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
  270.         return ret;
  271.     }
  272.  
  273.     if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
  274.         SegmentListEntry *entry;
  275.         double max_duration = 0;
  276.  
  277.         avio_printf(seg->list_pb, "#EXTM3U\n");
  278.         avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
  279.         avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
  280.         avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
  281.                     seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
  282.  
  283.         av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
  284.                seg->segment_list_entries->index);
  285.  
  286.         for (entry = seg->segment_list_entries; entry; entry = entry->next)
  287.             max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
  288.         avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
  289.     } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
  290.         avio_printf(seg->list_pb, "ffconcat version 1.0\n");
  291.     }
  292.  
  293.     return ret;
  294. }
  295.  
  296. static void segment_list_print_entry(AVIOContext      *list_ioctx,
  297.                                      ListType          list_type,
  298.                                      const SegmentListEntry *list_entry,
  299.                                      void *log_ctx)
  300. {
  301.     switch (list_type) {
  302.     case LIST_TYPE_FLAT:
  303.         avio_printf(list_ioctx, "%s\n", list_entry->filename);
  304.         break;
  305.     case LIST_TYPE_CSV:
  306.     case LIST_TYPE_EXT:
  307.         print_csv_escaped_str(list_ioctx, list_entry->filename);
  308.         avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
  309.         break;
  310.     case LIST_TYPE_M3U8:
  311.         avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
  312.                     list_entry->end_time - list_entry->start_time, list_entry->filename);
  313.         break;
  314.     case LIST_TYPE_FFCONCAT:
  315.     {
  316.         char *buf;
  317.         if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
  318.             av_log(log_ctx, AV_LOG_WARNING,
  319.                    "Error writing list entry '%s' in list file\n", list_entry->filename);
  320.             return;
  321.         }
  322.         avio_printf(list_ioctx, "file %s\n", buf);
  323.         av_free(buf);
  324.         break;
  325.     }
  326.     default:
  327.         av_assert0(!"Invalid list type");
  328.     }
  329. }
  330.  
  331. static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
  332. {
  333.     SegmentContext *seg = s->priv_data;
  334.     AVFormatContext *oc = seg->avf;
  335.     int ret = 0;
  336.  
  337.     av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
  338.     if (write_trailer)
  339.         ret = av_write_trailer(oc);
  340.  
  341.     if (ret < 0)
  342.         av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
  343.                oc->filename);
  344.  
  345.     if (seg->list) {
  346.         if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
  347.             SegmentListEntry *entry = av_mallocz(sizeof(*entry));
  348.             if (!entry) {
  349.                 ret = AVERROR(ENOMEM);
  350.                 goto end;
  351.             }
  352.  
  353.             /* append new element */
  354.             memcpy(entry, &seg->cur_entry, sizeof(*entry));
  355.             entry->filename = av_strdup(entry->filename);
  356.             if (!seg->segment_list_entries)
  357.                 seg->segment_list_entries = seg->segment_list_entries_end = entry;
  358.             else
  359.                 seg->segment_list_entries_end->next = entry;
  360.             seg->segment_list_entries_end = entry;
  361.  
  362.             /* drop first item */
  363.             if (seg->list_size && seg->segment_count >= seg->list_size) {
  364.                 entry = seg->segment_list_entries;
  365.                 seg->segment_list_entries = seg->segment_list_entries->next;
  366.                 av_freep(&entry->filename);
  367.                 av_freep(&entry);
  368.             }
  369.  
  370.             if ((ret = segment_list_open(s)) < 0)
  371.                 goto end;
  372.             for (entry = seg->segment_list_entries; entry; entry = entry->next)
  373.                 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
  374.             if (seg->list_type == LIST_TYPE_M3U8 && is_last)
  375.                 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
  376.             avio_closep(&seg->list_pb);
  377.             if (seg->use_rename)
  378.                 ff_rename(seg->temp_list_filename, seg->list, s);
  379.         } else {
  380.             segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
  381.             avio_flush(seg->list_pb);
  382.         }
  383.     }
  384.  
  385.     av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
  386.            seg->avf->filename, seg->segment_count);
  387.     seg->segment_count++;
  388.  
  389. end:
  390.     avio_closep(&oc->pb);
  391.  
  392.     return ret;
  393. }
  394.  
  395. static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
  396.                        const char *times_str)
  397. {
  398.     char *p;
  399.     int i, ret = 0;
  400.     char *times_str1 = av_strdup(times_str);
  401.     char *saveptr = NULL;
  402.  
  403.     if (!times_str1)
  404.         return AVERROR(ENOMEM);
  405.  
  406. #define FAIL(err) ret = err; goto end
  407.  
  408.     *nb_times = 1;
  409.     for (p = times_str1; *p; p++)
  410.         if (*p == ',')
  411.             (*nb_times)++;
  412.  
  413.     *times = av_malloc_array(*nb_times, sizeof(**times));
  414.     if (!*times) {
  415.         av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
  416.         FAIL(AVERROR(ENOMEM));
  417.     }
  418.  
  419.     p = times_str1;
  420.     for (i = 0; i < *nb_times; i++) {
  421.         int64_t t;
  422.         char *tstr = av_strtok(p, ",", &saveptr);
  423.         p = NULL;
  424.  
  425.         if (!tstr || !tstr[0]) {
  426.             av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
  427.                    times_str);
  428.             FAIL(AVERROR(EINVAL));
  429.         }
  430.  
  431.         ret = av_parse_time(&t, tstr, 1);
  432.         if (ret < 0) {
  433.             av_log(log_ctx, AV_LOG_ERROR,
  434.                    "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
  435.             FAIL(AVERROR(EINVAL));
  436.         }
  437.         (*times)[i] = t;
  438.  
  439.         /* check on monotonicity */
  440.         if (i && (*times)[i-1] > (*times)[i]) {
  441.             av_log(log_ctx, AV_LOG_ERROR,
  442.                    "Specified time %f is greater than the following time %f\n",
  443.                    (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
  444.             FAIL(AVERROR(EINVAL));
  445.         }
  446.     }
  447.  
  448. end:
  449.     av_free(times_str1);
  450.     return ret;
  451. }
  452.  
  453. static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
  454.                         const char *frames_str)
  455. {
  456.     char *p;
  457.     int i, ret = 0;
  458.     char *frames_str1 = av_strdup(frames_str);
  459.     char *saveptr = NULL;
  460.  
  461.     if (!frames_str1)
  462.         return AVERROR(ENOMEM);
  463.  
  464. #define FAIL(err) ret = err; goto end
  465.  
  466.     *nb_frames = 1;
  467.     for (p = frames_str1; *p; p++)
  468.         if (*p == ',')
  469.             (*nb_frames)++;
  470.  
  471.     *frames = av_malloc_array(*nb_frames, sizeof(**frames));
  472.     if (!*frames) {
  473.         av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
  474.         FAIL(AVERROR(ENOMEM));
  475.     }
  476.  
  477.     p = frames_str1;
  478.     for (i = 0; i < *nb_frames; i++) {
  479.         long int f;
  480.         char *tailptr;
  481.         char *fstr = av_strtok(p, ",", &saveptr);
  482.  
  483.         p = NULL;
  484.         if (!fstr) {
  485.             av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
  486.                    frames_str);
  487.             FAIL(AVERROR(EINVAL));
  488.         }
  489.         f = strtol(fstr, &tailptr, 10);
  490.         if (*tailptr || f <= 0 || f >= INT_MAX) {
  491.             av_log(log_ctx, AV_LOG_ERROR,
  492.                    "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
  493.                    fstr);
  494.             FAIL(AVERROR(EINVAL));
  495.         }
  496.         (*frames)[i] = f;
  497.  
  498.         /* check on monotonicity */
  499.         if (i && (*frames)[i-1] > (*frames)[i]) {
  500.             av_log(log_ctx, AV_LOG_ERROR,
  501.                    "Specified frame %d is greater than the following frame %d\n",
  502.                    (*frames)[i], (*frames)[i-1]);
  503.             FAIL(AVERROR(EINVAL));
  504.         }
  505.     }
  506.  
  507. end:
  508.     av_free(frames_str1);
  509.     return ret;
  510. }
  511.  
  512. static int open_null_ctx(AVIOContext **ctx)
  513. {
  514.     int buf_size = 32768;
  515.     uint8_t *buf = av_malloc(buf_size);
  516.     if (!buf)
  517.         return AVERROR(ENOMEM);
  518.     *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
  519.     if (!*ctx) {
  520.         av_free(buf);
  521.         return AVERROR(ENOMEM);
  522.     }
  523.     return 0;
  524. }
  525.  
  526. static void close_null_ctxp(AVIOContext **pb)
  527. {
  528.     av_freep(&(*pb)->buffer);
  529.     av_freep(pb);
  530. }
  531.  
  532. static int select_reference_stream(AVFormatContext *s)
  533. {
  534.     SegmentContext *seg = s->priv_data;
  535.     int ret, i;
  536.  
  537.     seg->reference_stream_index = -1;
  538.     if (!strcmp(seg->reference_stream_specifier, "auto")) {
  539.         /* select first index of type with highest priority */
  540.         int type_index_map[AVMEDIA_TYPE_NB];
  541.         static const enum AVMediaType type_priority_list[] = {
  542.             AVMEDIA_TYPE_VIDEO,
  543.             AVMEDIA_TYPE_AUDIO,
  544.             AVMEDIA_TYPE_SUBTITLE,
  545.             AVMEDIA_TYPE_DATA,
  546.             AVMEDIA_TYPE_ATTACHMENT
  547.         };
  548.         enum AVMediaType type;
  549.  
  550.         for (i = 0; i < AVMEDIA_TYPE_NB; i++)
  551.             type_index_map[i] = -1;
  552.  
  553.         /* select first index for each type */
  554.         for (i = 0; i < s->nb_streams; i++) {
  555.             type = s->streams[i]->codec->codec_type;
  556.             if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
  557.                 /* ignore attached pictures/cover art streams */
  558.                 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
  559.                 type_index_map[type] = i;
  560.         }
  561.  
  562.         for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
  563.             type = type_priority_list[i];
  564.             if ((seg->reference_stream_index = type_index_map[type]) >= 0)
  565.                 break;
  566.         }
  567.     } else {
  568.         for (i = 0; i < s->nb_streams; i++) {
  569.             ret = avformat_match_stream_specifier(s, s->streams[i],
  570.                                                   seg->reference_stream_specifier);
  571.             if (ret < 0)
  572.                 return ret;
  573.             if (ret > 0) {
  574.                 seg->reference_stream_index = i;
  575.                 break;
  576.             }
  577.         }
  578.     }
  579.  
  580.     if (seg->reference_stream_index < 0) {
  581.         av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
  582.                seg->reference_stream_specifier);
  583.         return AVERROR(EINVAL);
  584.     }
  585.  
  586.     return 0;
  587. }
  588.  
  589. static void seg_free_context(SegmentContext *seg)
  590. {
  591.     avio_closep(&seg->list_pb);
  592.     avformat_free_context(seg->avf);
  593.     seg->avf = NULL;
  594. }
  595.  
  596. static int seg_write_header(AVFormatContext *s)
  597. {
  598.     SegmentContext *seg = s->priv_data;
  599.     AVFormatContext *oc = NULL;
  600.     AVDictionary *options = NULL;
  601.     int ret;
  602.     int i;
  603.  
  604.     seg->segment_count = 0;
  605.     if (!seg->write_header_trailer)
  606.         seg->individual_header_trailer = 0;
  607.  
  608.     if (seg->header_filename) {
  609.         seg->write_header_trailer = 1;
  610.         seg->individual_header_trailer = 0;
  611.     }
  612.  
  613.     if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
  614.         av_log(s, AV_LOG_ERROR,
  615.                "segment_time, segment_times, and segment_frames options "
  616.                "are mutually exclusive, select just one of them\n");
  617.         return AVERROR(EINVAL);
  618.     }
  619.  
  620.     if (seg->times_str) {
  621.         if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
  622.             return ret;
  623.     } else if (seg->frames_str) {
  624.         if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
  625.             return ret;
  626.     } else {
  627.         /* set default value if not specified */
  628.         if (!seg->time_str)
  629.             seg->time_str = av_strdup("2");
  630.         if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
  631.             av_log(s, AV_LOG_ERROR,
  632.                    "Invalid time duration specification '%s' for segment_time option\n",
  633.                    seg->time_str);
  634.             return ret;
  635.         }
  636.     }
  637.  
  638.     if (seg->format_options_str) {
  639.         ret = av_dict_parse_string(&seg->format_options, seg->format_options_str, "=", ":", 0);
  640.         if (ret < 0) {
  641.             av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
  642.                    seg->format_options_str);
  643.             goto fail;
  644.         }
  645.     }
  646.  
  647.     if (seg->list) {
  648.         if (seg->list_type == LIST_TYPE_UNDEFINED) {
  649.             if      (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
  650.             else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
  651.             else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
  652.             else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
  653.             else                                      seg->list_type = LIST_TYPE_FLAT;
  654.         }
  655.         if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
  656.             if ((ret = segment_list_open(s)) < 0)
  657.                 goto fail;
  658.         } else {
  659.             const char *proto = avio_find_protocol_name(s->filename);
  660.             seg->use_rename = proto && !strcmp(proto, "file");
  661.         }
  662.     }
  663.     if (seg->list_type == LIST_TYPE_EXT)
  664.         av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
  665.  
  666.     if ((ret = select_reference_stream(s)) < 0)
  667.         goto fail;
  668.     av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
  669.            seg->reference_stream_index,
  670.            av_get_media_type_string(s->streams[seg->reference_stream_index]->codec->codec_type));
  671.  
  672.     seg->oformat = av_guess_format(seg->format, s->filename, NULL);
  673.  
  674.     if (!seg->oformat) {
  675.         ret = AVERROR_MUXER_NOT_FOUND;
  676.         goto fail;
  677.     }
  678.     if (seg->oformat->flags & AVFMT_NOFILE) {
  679.         av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
  680.                seg->oformat->name);
  681.         ret = AVERROR(EINVAL);
  682.         goto fail;
  683.     }
  684.  
  685.     if ((ret = segment_mux_init(s)) < 0)
  686.         goto fail;
  687.     oc = seg->avf;
  688.  
  689.     if ((ret = set_segment_filename(s)) < 0)
  690.         goto fail;
  691.  
  692.     if (seg->write_header_trailer) {
  693.         if ((ret = avio_open2(&oc->pb, seg->header_filename ? seg->header_filename : oc->filename, AVIO_FLAG_WRITE,
  694.                               &s->interrupt_callback, NULL)) < 0) {
  695.             av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
  696.             goto fail;
  697.         }
  698.         if (!seg->individual_header_trailer)
  699.             oc->pb->seekable = 0;
  700.     } else {
  701.         if ((ret = open_null_ctx(&oc->pb)) < 0)
  702.             goto fail;
  703.     }
  704.  
  705.     av_dict_copy(&options, seg->format_options, 0);
  706.     ret = avformat_write_header(oc, &options);
  707.     if (av_dict_count(options)) {
  708.         av_log(s, AV_LOG_ERROR,
  709.                "Some of the provided format options in '%s' are not recognized\n", seg->format_options_str);
  710.         ret = AVERROR(EINVAL);
  711.         goto fail;
  712.     }
  713.  
  714.     if (ret < 0) {
  715.         avio_closep(&oc->pb);
  716.         goto fail;
  717.     }
  718.     seg->segment_frame_count = 0;
  719.  
  720.     av_assert0(s->nb_streams == oc->nb_streams);
  721.     for (i = 0; i < s->nb_streams; i++) {
  722.         AVStream *inner_st  = oc->streams[i];
  723.         AVStream *outer_st = s->streams[i];
  724.         avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
  725.     }
  726.  
  727.     if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
  728.         s->avoid_negative_ts = 1;
  729.  
  730.     if (!seg->write_header_trailer || seg->header_filename) {
  731.         if (seg->header_filename) {
  732.             av_write_frame(oc, NULL);
  733.             avio_closep(&oc->pb);
  734.         } else {
  735.             close_null_ctxp(&oc->pb);
  736.         }
  737.         if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
  738.                               &s->interrupt_callback, NULL)) < 0)
  739.             goto fail;
  740.         if (!seg->individual_header_trailer)
  741.             oc->pb->seekable = 0;
  742.     }
  743.  
  744. fail:
  745.     av_dict_free(&options);
  746.     if (ret < 0)
  747.         seg_free_context(seg);
  748.  
  749.     return ret;
  750. }
  751.  
  752. static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
  753. {
  754.     SegmentContext *seg = s->priv_data;
  755.     AVStream *st = s->streams[pkt->stream_index];
  756.     int64_t end_pts = INT64_MAX, offset;
  757.     int start_frame = INT_MAX;
  758.     int ret;
  759.     struct tm ti;
  760.     int64_t usecs;
  761.     int64_t wrapped_val;
  762.  
  763.     if (!seg->avf)
  764.         return AVERROR(EINVAL);
  765.  
  766.     if (seg->times) {
  767.         end_pts = seg->segment_count < seg->nb_times ?
  768.             seg->times[seg->segment_count] : INT64_MAX;
  769.     } else if (seg->frames) {
  770.         start_frame = seg->segment_count < seg->nb_frames ?
  771.             seg->frames[seg->segment_count] : INT_MAX;
  772.     } else {
  773.         if (seg->use_clocktime) {
  774.             int64_t avgt = av_gettime();
  775.             time_t sec = avgt / 1000000;
  776.             localtime_r(&sec, &ti);
  777.             usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
  778.             wrapped_val = usecs % seg->time;
  779.             if (seg->last_cut != usecs && wrapped_val < seg->last_val) {
  780.                 seg->cut_pending = 1;
  781.                 seg->last_cut = usecs;
  782.             }
  783.             seg->last_val = wrapped_val;
  784.         } else {
  785.             end_pts = seg->time * (seg->segment_count + 1);
  786.         }
  787.     }
  788.  
  789.     ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
  790.             pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
  791.             av_ts2timestr(pkt->duration, &st->time_base),
  792.             pkt->flags & AV_PKT_FLAG_KEY,
  793.             pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
  794.  
  795.     if (pkt->stream_index == seg->reference_stream_index &&
  796.         (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
  797.         seg->segment_frame_count > 0 &&
  798.         (seg->cut_pending || seg->frame_count >= start_frame ||
  799.          (pkt->pts != AV_NOPTS_VALUE &&
  800.           av_compare_ts(pkt->pts, st->time_base,
  801.                         end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
  802.         /* sanitize end time in case last packet didn't have a defined duration */
  803.         if (seg->cur_entry.last_duration == 0)
  804.             seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
  805.  
  806.         if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
  807.             goto fail;
  808.  
  809.         if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
  810.             goto fail;
  811.  
  812.         seg->cut_pending = 0;
  813.         seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
  814.         seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
  815.         seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
  816.         seg->cur_entry.end_time = seg->cur_entry.start_time +
  817.             pkt->pts != AV_NOPTS_VALUE ? (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base) : 0;
  818.     } else if (pkt->pts != AV_NOPTS_VALUE && pkt->stream_index == seg->reference_stream_index) {
  819.         seg->cur_entry.end_time =
  820.             FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
  821.         seg->cur_entry.last_duration = pkt->duration;
  822.     }
  823.  
  824.     if (seg->segment_frame_count == 0) {
  825.         av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
  826.                seg->avf->filename, pkt->stream_index,
  827.                av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
  828.     }
  829.  
  830.     av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
  831.            pkt->stream_index,
  832.            av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
  833.            av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
  834.            av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
  835.  
  836.     /* compute new timestamps */
  837.     offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
  838.                           AV_TIME_BASE_Q, st->time_base);
  839.     if (pkt->pts != AV_NOPTS_VALUE)
  840.         pkt->pts += offset;
  841.     if (pkt->dts != AV_NOPTS_VALUE)
  842.         pkt->dts += offset;
  843.  
  844.     av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
  845.            av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
  846.            av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
  847.  
  848.     ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s, seg->initial_offset || seg->reset_timestamps);
  849.  
  850. fail:
  851.     if (pkt->stream_index == seg->reference_stream_index) {
  852.         seg->frame_count++;
  853.         seg->segment_frame_count++;
  854.     }
  855.  
  856.     if (ret < 0)
  857.         seg_free_context(seg);
  858.  
  859.     return ret;
  860. }
  861.  
  862. static int seg_write_trailer(struct AVFormatContext *s)
  863. {
  864.     SegmentContext *seg = s->priv_data;
  865.     AVFormatContext *oc = seg->avf;
  866.     SegmentListEntry *cur, *next;
  867.     int ret = 0;
  868.  
  869.     if (!oc)
  870.         goto fail;
  871.  
  872.     if (!seg->write_header_trailer) {
  873.         if ((ret = segment_end(s, 0, 1)) < 0)
  874.             goto fail;
  875.         if ((ret = open_null_ctx(&oc->pb)) < 0)
  876.             goto fail;
  877.         ret = av_write_trailer(oc);
  878.         close_null_ctxp(&oc->pb);
  879.     } else {
  880.         ret = segment_end(s, 1, 1);
  881.     }
  882. fail:
  883.     if (seg->list)
  884.         avio_closep(&seg->list_pb);
  885.  
  886.     av_dict_free(&seg->format_options);
  887.     av_opt_free(seg);
  888.     av_freep(&seg->times);
  889.     av_freep(&seg->frames);
  890.     av_freep(&seg->cur_entry.filename);
  891.  
  892.     cur = seg->segment_list_entries;
  893.     while (cur) {
  894.         next = cur->next;
  895.         av_freep(&cur->filename);
  896.         av_free(cur);
  897.         cur = next;
  898.     }
  899.  
  900.     avformat_free_context(oc);
  901.     seg->avf = NULL;
  902.     return ret;
  903. }
  904.  
  905. #define OFFSET(x) offsetof(SegmentContext, x)
  906. #define E AV_OPT_FLAG_ENCODING_PARAM
  907. static const AVOption options[] = {
  908.     { "reference_stream",  "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
  909.     { "segment_format",    "set container format used for the segments", OFFSET(format),  AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
  910.     { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
  911.     { "segment_list",      "set the segment list filename",              OFFSET(list),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
  912.     { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
  913.  
  914.     { "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"},
  915.     { "cache",             "allow list caching",                                    0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX,   E, "list_flags"},
  916.     { "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"},
  917.  
  918.     { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT,  {.i64 = 0},     0, INT_MAX, E },
  919.  
  920.     { "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" },
  921.     { "flat", "flat format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
  922.     { "csv",  "csv format",      0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV  }, INT_MIN, INT_MAX, E, "list_type" },
  923.     { "ext",  "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT  }, INT_MIN, INT_MAX, E, "list_type" },
  924.     { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
  925.     { "m3u8", "M3U8 format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
  926.     { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
  927.  
  928.     { "segment_atclocktime",      "set segment to be cut at clocktime",  OFFSET(use_clocktime), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E},
  929.     { "segment_time",      "set segment duration",                       OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
  930.     { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
  931.     { "segment_times",     "set segment split time points",              OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
  932.     { "segment_frames",    "set segment split frame numbers",            OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
  933.     { "segment_wrap",      "set number after which the index wraps",     OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
  934.     { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING,  {.str = NULL}, 0, 0, E },
  935.     { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
  936.     { "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 },
  937.     { "strftime",          "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, E },
  938.     { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
  939.  
  940.     { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
  941.     { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
  942.     { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
  943.     { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
  944.     { NULL },
  945. };
  946.  
  947. static const AVClass seg_class = {
  948.     .class_name = "segment muxer",
  949.     .item_name  = av_default_item_name,
  950.     .option     = options,
  951.     .version    = LIBAVUTIL_VERSION_INT,
  952. };
  953.  
  954. AVOutputFormat ff_segment_muxer = {
  955.     .name           = "segment",
  956.     .long_name      = NULL_IF_CONFIG_SMALL("segment"),
  957.     .priv_data_size = sizeof(SegmentContext),
  958.     .flags          = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
  959.     .write_header   = seg_write_header,
  960.     .write_packet   = seg_write_packet,
  961.     .write_trailer  = seg_write_trailer,
  962.     .priv_class     = &seg_class,
  963. };
  964.  
  965. static const AVClass sseg_class = {
  966.     .class_name = "stream_segment muxer",
  967.     .item_name  = av_default_item_name,
  968.     .option     = options,
  969.     .version    = LIBAVUTIL_VERSION_INT,
  970. };
  971.  
  972. AVOutputFormat ff_stream_segment_muxer = {
  973.     .name           = "stream_segment,ssegment",
  974.     .long_name      = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
  975.     .priv_data_size = sizeof(SegmentContext),
  976.     .flags          = AVFMT_NOFILE,
  977.     .write_header   = seg_write_header,
  978.     .write_packet   = seg_write_packet,
  979.     .write_trailer  = seg_write_trailer,
  980.     .priv_class     = &sseg_class,
  981. };
  982.