yading@11: /*
yading@11:  * Copyright (c) 2011, Luca Barbato
yading@11:  *
yading@11:  * This file is part of Libav.
yading@11:  *
yading@11:  * Libav is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * Libav is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with Libav; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file generic segmenter
yading@11:  * M3U8 specification can be find here:
yading@11:  * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
yading@11:  */
yading@11: 
yading@11: /* #define DEBUG */
yading@11: 
yading@11: #include <float.h>
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #include "libavutil/avassert.h"
yading@11: #include "libavutil/log.h"
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/parseutils.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "libavutil/timestamp.h"
yading@11: 
yading@11: typedef struct SegmentListEntry {
yading@11:     int index;
yading@11:     double start_time, end_time;
yading@11:     int64_t start_pts;
yading@11:     char filename[1024];
yading@11:     struct SegmentListEntry *next;
yading@11: } SegmentListEntry;
yading@11: 
yading@11: typedef enum {
yading@11:     LIST_TYPE_UNDEFINED = -1,
yading@11:     LIST_TYPE_FLAT = 0,
yading@11:     LIST_TYPE_CSV,
yading@11:     LIST_TYPE_M3U8,
yading@11:     LIST_TYPE_EXT, ///< deprecated
yading@11:     LIST_TYPE_FFCONCAT,
yading@11:     LIST_TYPE_NB,
yading@11: } ListType;
yading@11: 
yading@11: #define SEGMENT_LIST_FLAG_CACHE 1
yading@11: #define SEGMENT_LIST_FLAG_LIVE  2
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;  /**< Class for private options. */
yading@11:     int segment_idx;       ///< index of the segment file to write, starting from 0
yading@11:     int segment_idx_wrap;  ///< number after which the index wraps
yading@11:     int segment_count;     ///< number of segment files already written
yading@11:     AVOutputFormat *oformat;
yading@11:     AVFormatContext *avf;
yading@11:     char *format;          ///< format to use for output segment files
yading@11:     char *list;            ///< filename for the segment list file
yading@11:     int   list_flags;      ///< flags affecting list generation
yading@11:     int   list_size;       ///< number of entries for the segment list file
yading@11:     ListType list_type;    ///< set the list type
yading@11:     AVIOContext *list_pb;  ///< list file put-byte context
yading@11:     char *time_str;        ///< segment duration specification string
yading@11:     int64_t time;          ///< segment duration
yading@11: 
yading@11:     char *times_str;       ///< segment times specification string
yading@11:     int64_t *times;        ///< list of segment interval specification
yading@11:     int nb_times;          ///< number of elments in the times array
yading@11: 
yading@11:     char *frames_str;      ///< segment frame numbers specification string
yading@11:     int *frames;           ///< list of frame number specification
yading@11:     int nb_frames;         ///< number of elments in the frames array
yading@11:     int frame_count;
yading@11: 
yading@11:     char *time_delta_str;  ///< approximation value duration used for the segment times
yading@11:     int64_t time_delta;
yading@11:     int  individual_header_trailer; /**< Set by a private option. */
yading@11:     int  write_header_trailer; /**< Set by a private option. */
yading@11: 
yading@11:     int reset_timestamps;  ///< reset timestamps at the begin of each segment
yading@11:     char *reference_stream_specifier; ///< reference stream specifier
yading@11:     int   reference_stream_index;
yading@11: 
yading@11:     SegmentListEntry cur_entry;
yading@11:     SegmentListEntry *segment_list_entries;
yading@11:     SegmentListEntry *segment_list_entries_end;
yading@11: 
yading@11:     int is_first_pkt;      ///< tells if it is the first packet in the segment
yading@11: } SegmentContext;
yading@11: 
yading@11: static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
yading@11: {
yading@11:     int needs_quoting = !!str[strcspn(str, "\",\n\r")];
yading@11: 
yading@11:     if (needs_quoting)
yading@11:         avio_w8(ctx, '"');
yading@11: 
yading@11:     for (; *str; str++) {
yading@11:         if (*str == '"')
yading@11:             avio_w8(ctx, '"');
yading@11:         avio_w8(ctx, *str);
yading@11:     }
yading@11:     if (needs_quoting)
yading@11:         avio_w8(ctx, '"');
yading@11: }
yading@11: 
yading@11: static int segment_mux_init(AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc;
yading@11:     int i;
yading@11: 
yading@11:     seg->avf = oc = avformat_alloc_context();
yading@11:     if (!oc)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     oc->oformat            = seg->oformat;
yading@11:     oc->interrupt_callback = s->interrupt_callback;
yading@11:     av_dict_copy(&oc->metadata, s->metadata, 0);
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         AVStream *st;
yading@11:         AVCodecContext *icodec, *ocodec;
yading@11: 
yading@11:         if (!(st = avformat_new_stream(oc, NULL)))
yading@11:             return AVERROR(ENOMEM);
yading@11:         icodec = s->streams[i]->codec;
yading@11:         ocodec = st->codec;
yading@11:         avcodec_copy_context(ocodec, icodec);
yading@11:         if (!oc->oformat->codec_tag ||
yading@11:             av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||
yading@11:             av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {
yading@11:             ocodec->codec_tag = icodec->codec_tag;
yading@11:         } else {
yading@11:             ocodec->codec_tag = 0;
yading@11:         }
yading@11:         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int set_segment_filename(AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = seg->avf;
yading@11: 
yading@11:     if (seg->segment_idx_wrap)
yading@11:         seg->segment_idx %= seg->segment_idx_wrap;
yading@11:     if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
yading@11:                               s->filename, seg->segment_idx) < 0) {
yading@11:         av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11:     av_strlcpy(seg->cur_entry.filename, oc->filename, sizeof(seg->cur_entry.filename));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int segment_start(AVFormatContext *s, int write_header)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = seg->avf;
yading@11:     int err = 0;
yading@11: 
yading@11:     if (write_header) {
yading@11:         avformat_free_context(oc);
yading@11:         seg->avf = NULL;
yading@11:         if ((err = segment_mux_init(s)) < 0)
yading@11:             return err;
yading@11:         oc = seg->avf;
yading@11:     }
yading@11: 
yading@11:     seg->segment_idx++;
yading@11:     if ((err = set_segment_filename(s)) < 0)
yading@11:         return err;
yading@11:     seg->segment_count++;
yading@11: 
yading@11:     if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
yading@11:                           &s->interrupt_callback, NULL)) < 0)
yading@11:         return err;
yading@11: 
yading@11:     if (oc->oformat->priv_class && oc->priv_data)
yading@11:         av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */
yading@11: 
yading@11:     if (write_header) {
yading@11:         if ((err = avformat_write_header(oc, NULL)) < 0)
yading@11:             return err;
yading@11:     }
yading@11: 
yading@11:     seg->is_first_pkt = 1;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int segment_list_open(AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
yading@11:                      &s->interrupt_callback, NULL);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
yading@11:         SegmentListEntry *entry;
yading@11:         double max_duration = 0;
yading@11: 
yading@11:         avio_printf(seg->list_pb, "#EXTM3U\n");
yading@11:         avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
yading@11:         avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
yading@11:         avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
yading@11:                     seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
yading@11: 
yading@11:         for (entry = seg->segment_list_entries; entry; entry = entry->next)
yading@11:             max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
yading@11:         avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
yading@11:     } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
yading@11:         avio_printf(seg->list_pb, "ffconcat version 1.0\n");
yading@11:     }
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static void segment_list_print_entry(AVIOContext      *list_ioctx,
yading@11:                                      ListType          list_type,
yading@11:                                      const SegmentListEntry *list_entry,
yading@11:                                      void *log_ctx)
yading@11: {
yading@11:     switch (list_type) {
yading@11:     case LIST_TYPE_FLAT:
yading@11:         avio_printf(list_ioctx, "%s\n", list_entry->filename);
yading@11:         break;
yading@11:     case LIST_TYPE_CSV:
yading@11:     case LIST_TYPE_EXT:
yading@11:         print_csv_escaped_str(list_ioctx, list_entry->filename);
yading@11:         avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
yading@11:         break;
yading@11:     case LIST_TYPE_M3U8:
yading@11:         avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
yading@11:                     list_entry->end_time - list_entry->start_time, list_entry->filename);
yading@11:         break;
yading@11:     case LIST_TYPE_FFCONCAT:
yading@11:     {
yading@11:         char *buf;
yading@11:         if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
yading@11:             av_log(log_ctx, AV_LOG_WARNING,
yading@11:                    "Error writing list entry '%s' in list file\n", list_entry->filename);
yading@11:             return;
yading@11:         }
yading@11:         avio_printf(list_ioctx, "file %s\n", buf);
yading@11:         av_free(buf);
yading@11:         break;
yading@11:     }
yading@11:     default:
yading@11:         av_assert0(!"Invalid list type");
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = seg->avf;
yading@11:     int ret = 0;
yading@11: 
yading@11:     av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
yading@11:     if (write_trailer)
yading@11:         ret = av_write_trailer(oc);
yading@11: 
yading@11:     if (ret < 0)
yading@11:         av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
yading@11:                oc->filename);
yading@11: 
yading@11:     if (seg->list) {
yading@11:         if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
yading@11:             SegmentListEntry *entry = av_mallocz(sizeof(*entry));
yading@11:             if (!entry) {
yading@11:                 ret = AVERROR(ENOMEM);
yading@11:                 goto end;
yading@11:             }
yading@11: 
yading@11:             /* append new element */
yading@11:             memcpy(entry, &seg->cur_entry, sizeof(*entry));
yading@11:             if (!seg->segment_list_entries)
yading@11:                 seg->segment_list_entries = seg->segment_list_entries_end = entry;
yading@11:             else
yading@11:                 seg->segment_list_entries_end->next = entry;
yading@11:             seg->segment_list_entries_end = entry;
yading@11: 
yading@11:             /* drop first item */
yading@11:             if (seg->list_size && seg->segment_count > seg->list_size) {
yading@11:                 entry = seg->segment_list_entries;
yading@11:                 seg->segment_list_entries = seg->segment_list_entries->next;
yading@11:                 av_freep(&entry);
yading@11:             }
yading@11: 
yading@11:             avio_close(seg->list_pb);
yading@11:             if ((ret = segment_list_open(s)) < 0)
yading@11:                 goto end;
yading@11:             for (entry = seg->segment_list_entries; entry; entry = entry->next)
yading@11:                 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
yading@11:             if (seg->list_type == LIST_TYPE_M3U8 && is_last)
yading@11:                 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
yading@11:         } else {
yading@11:             segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
yading@11:         }
yading@11:         avio_flush(seg->list_pb);
yading@11:     }
yading@11: 
yading@11: end:
yading@11:     avio_close(oc->pb);
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
yading@11:                        const char *times_str)
yading@11: {
yading@11:     char *p;
yading@11:     int i, ret = 0;
yading@11:     char *times_str1 = av_strdup(times_str);
yading@11:     char *saveptr = NULL;
yading@11: 
yading@11:     if (!times_str1)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11: #define FAIL(err) ret = err; goto end
yading@11: 
yading@11:     *nb_times = 1;
yading@11:     for (p = times_str1; *p; p++)
yading@11:         if (*p == ',')
yading@11:             (*nb_times)++;
yading@11: 
yading@11:     *times = av_malloc(sizeof(**times) * *nb_times);
yading@11:     if (!*times) {
yading@11:         av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
yading@11:         FAIL(AVERROR(ENOMEM));
yading@11:     }
yading@11: 
yading@11:     p = times_str1;
yading@11:     for (i = 0; i < *nb_times; i++) {
yading@11:         int64_t t;
yading@11:         char *tstr = av_strtok(p, ",", &saveptr);
yading@11:         p = NULL;
yading@11: 
yading@11:         if (!tstr || !tstr[0]) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
yading@11:                    times_str);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11: 
yading@11:         ret = av_parse_time(&t, tstr, 1);
yading@11:         if (ret < 0) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR,
yading@11:                    "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11:         (*times)[i] = t;
yading@11: 
yading@11:         /* check on monotonicity */
yading@11:         if (i && (*times)[i-1] > (*times)[i]) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR,
yading@11:                    "Specified time %f is greater than the following time %f\n",
yading@11:                    (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11:     }
yading@11: 
yading@11: end:
yading@11:     av_free(times_str1);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
yading@11:                         const char *frames_str)
yading@11: {
yading@11:     char *p;
yading@11:     int i, ret = 0;
yading@11:     char *frames_str1 = av_strdup(frames_str);
yading@11:     char *saveptr = NULL;
yading@11: 
yading@11:     if (!frames_str1)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11: #define FAIL(err) ret = err; goto end
yading@11: 
yading@11:     *nb_frames = 1;
yading@11:     for (p = frames_str1; *p; p++)
yading@11:         if (*p == ',')
yading@11:             (*nb_frames)++;
yading@11: 
yading@11:     *frames = av_malloc(sizeof(**frames) * *nb_frames);
yading@11:     if (!*frames) {
yading@11:         av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
yading@11:         FAIL(AVERROR(ENOMEM));
yading@11:     }
yading@11: 
yading@11:     p = frames_str1;
yading@11:     for (i = 0; i < *nb_frames; i++) {
yading@11:         long int f;
yading@11:         char *tailptr;
yading@11:         char *fstr = av_strtok(p, ",", &saveptr);
yading@11: 
yading@11:         p = NULL;
yading@11:         if (!fstr) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
yading@11:                    frames_str);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11:         f = strtol(fstr, &tailptr, 10);
yading@11:         if (*tailptr || f <= 0 || f >= INT_MAX) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR,
yading@11:                    "Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
yading@11:                    fstr);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11:         (*frames)[i] = f;
yading@11: 
yading@11:         /* check on monotonicity */
yading@11:         if (i && (*frames)[i-1] > (*frames)[i]) {
yading@11:             av_log(log_ctx, AV_LOG_ERROR,
yading@11:                    "Specified frame %d is greater than the following frame %d\n",
yading@11:                    (*frames)[i], (*frames)[i-1]);
yading@11:             FAIL(AVERROR(EINVAL));
yading@11:         }
yading@11:     }
yading@11: 
yading@11: end:
yading@11:     av_free(frames_str1);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int open_null_ctx(AVIOContext **ctx)
yading@11: {
yading@11:     int buf_size = 32768;
yading@11:     uint8_t *buf = av_malloc(buf_size);
yading@11:     if (!buf)
yading@11:         return AVERROR(ENOMEM);
yading@11:     *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
yading@11:     if (!*ctx) {
yading@11:         av_free(buf);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static void close_null_ctx(AVIOContext *pb)
yading@11: {
yading@11:     av_free(pb->buffer);
yading@11:     av_free(pb);
yading@11: }
yading@11: 
yading@11: static int select_reference_stream(AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     int ret, i;
yading@11: 
yading@11:     seg->reference_stream_index = -1;
yading@11:     if (!strcmp(seg->reference_stream_specifier, "auto")) {
yading@11:         /* select first index of type with highest priority */
yading@11:         int type_index_map[AVMEDIA_TYPE_NB];
yading@11:         static const enum AVMediaType type_priority_list[] = {
yading@11:             AVMEDIA_TYPE_VIDEO,
yading@11:             AVMEDIA_TYPE_AUDIO,
yading@11:             AVMEDIA_TYPE_SUBTITLE,
yading@11:             AVMEDIA_TYPE_DATA,
yading@11:             AVMEDIA_TYPE_ATTACHMENT
yading@11:         };
yading@11:         enum AVMediaType type;
yading@11: 
yading@11:         for (i = 0; i < AVMEDIA_TYPE_NB; i++)
yading@11:             type_index_map[i] = -1;
yading@11: 
yading@11:         /* select first index for each type */
yading@11:         for (i = 0; i < s->nb_streams; i++) {
yading@11:             type = s->streams[i]->codec->codec_type;
yading@11:             if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
yading@11:                 /* ignore attached pictures/cover art streams */
yading@11:                 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
yading@11:                 type_index_map[type] = i;
yading@11:         }
yading@11: 
yading@11:         for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
yading@11:             type = type_priority_list[i];
yading@11:             if ((seg->reference_stream_index = type_index_map[type]) >= 0)
yading@11:                 break;
yading@11:         }
yading@11:     } else {
yading@11:         for (i = 0; i < s->nb_streams; i++) {
yading@11:             ret = avformat_match_stream_specifier(s, s->streams[i],
yading@11:                                                   seg->reference_stream_specifier);
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11:             if (ret > 0) {
yading@11:                 seg->reference_stream_index = i;
yading@11:                 break;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (seg->reference_stream_index < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
yading@11:                seg->reference_stream_specifier);
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int seg_write_header(AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = NULL;
yading@11:     int ret;
yading@11: 
yading@11:     seg->segment_count = 0;
yading@11:     if (!seg->write_header_trailer)
yading@11:         seg->individual_header_trailer = 0;
yading@11: 
yading@11:     if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
yading@11:         av_log(s, AV_LOG_ERROR,
yading@11:                "segment_time, segment_times, and segment_frames options "
yading@11:                "are mutually exclusive, select just one of them\n");
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     if (seg->times_str) {
yading@11:         if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
yading@11:             return ret;
yading@11:     } else if (seg->frames_str) {
yading@11:         if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
yading@11:             return ret;
yading@11:     } else {
yading@11:         /* set default value if not specified */
yading@11:         if (!seg->time_str)
yading@11:             seg->time_str = av_strdup("2");
yading@11:         if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "Invalid time duration specification '%s' for segment_time option\n",
yading@11:                    seg->time_str);
yading@11:             return ret;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (seg->time_delta_str) {
yading@11:         if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "Invalid time duration specification '%s' for delta option\n",
yading@11:                    seg->time_delta_str);
yading@11:             return ret;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (seg->list) {
yading@11:         if (seg->list_type == LIST_TYPE_UNDEFINED) {
yading@11:             if      (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
yading@11:             else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
yading@11:             else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
yading@11:             else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
yading@11:             else                                      seg->list_type = LIST_TYPE_FLAT;
yading@11:         }
yading@11:         if ((ret = segment_list_open(s)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11:     if (seg->list_type == LIST_TYPE_EXT)
yading@11:         av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
yading@11: 
yading@11:     if ((ret = select_reference_stream(s)) < 0)
yading@11:         goto fail;
yading@11:     av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
yading@11:            seg->reference_stream_index,
yading@11:            av_get_media_type_string(s->streams[seg->reference_stream_index]->codec->codec_type));
yading@11: 
yading@11:     seg->oformat = av_guess_format(seg->format, s->filename, NULL);
yading@11: 
yading@11:     if (!seg->oformat) {
yading@11:         ret = AVERROR_MUXER_NOT_FOUND;
yading@11:         goto fail;
yading@11:     }
yading@11:     if (seg->oformat->flags & AVFMT_NOFILE) {
yading@11:         av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
yading@11:                seg->oformat->name);
yading@11:         ret = AVERROR(EINVAL);
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     if ((ret = segment_mux_init(s)) < 0)
yading@11:         goto fail;
yading@11:     oc = seg->avf;
yading@11: 
yading@11:     if ((ret = set_segment_filename(s)) < 0)
yading@11:         goto fail;
yading@11:     seg->segment_count++;
yading@11: 
yading@11:     if (seg->write_header_trailer) {
yading@11:         if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
yading@11:                               &s->interrupt_callback, NULL)) < 0)
yading@11:             goto fail;
yading@11:     } else {
yading@11:         if ((ret = open_null_ctx(&oc->pb)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11: 
yading@11:     if ((ret = avformat_write_header(oc, NULL)) < 0) {
yading@11:         avio_close(oc->pb);
yading@11:         goto fail;
yading@11:     }
yading@11:     seg->is_first_pkt = 1;
yading@11: 
yading@11:     if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
yading@11:         s->avoid_negative_ts = 1;
yading@11: 
yading@11:     if (!seg->write_header_trailer) {
yading@11:         close_null_ctx(oc->pb);
yading@11:         if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
yading@11:                               &s->interrupt_callback, NULL)) < 0)
yading@11:             goto fail;
yading@11:     }
yading@11: 
yading@11: fail:
yading@11:     if (ret) {
yading@11:         if (seg->list)
yading@11:             avio_close(seg->list_pb);
yading@11:         if (seg->avf)
yading@11:             avformat_free_context(seg->avf);
yading@11:     }
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = seg->avf;
yading@11:     AVStream *st = s->streams[pkt->stream_index];
yading@11:     int64_t end_pts = INT64_MAX;
yading@11:     int start_frame = INT_MAX;
yading@11:     int ret;
yading@11: 
yading@11:     if (seg->times) {
yading@11:         end_pts = seg->segment_count <= seg->nb_times ?
yading@11:             seg->times[seg->segment_count-1] : INT64_MAX;
yading@11:     } else if (seg->frames) {
yading@11:         start_frame = seg->segment_count <= seg->nb_frames ?
yading@11:             seg->frames[seg->segment_count-1] : INT_MAX;
yading@11:     } else {
yading@11:         end_pts = seg->time * seg->segment_count;
yading@11:     }
yading@11: 
yading@11:     av_dlog(s, "packet stream:%d pts:%s pts_time:%s is_key:%d frame:%d\n",
yading@11:            pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
yading@11:            pkt->flags & AV_PKT_FLAG_KEY,
yading@11:            pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
yading@11: 
yading@11:     if (pkt->stream_index == seg->reference_stream_index &&
yading@11:         pkt->flags & AV_PKT_FLAG_KEY &&
yading@11:         (seg->frame_count >= start_frame ||
yading@11:          (pkt->pts != AV_NOPTS_VALUE &&
yading@11:           av_compare_ts(pkt->pts, st->time_base,
yading@11:                         end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
yading@11:         ret = segment_end(s, seg->individual_header_trailer, 0);
yading@11: 
yading@11:         if (!ret)
yading@11:             ret = segment_start(s, seg->individual_header_trailer);
yading@11: 
yading@11:         if (ret)
yading@11:             goto fail;
yading@11: 
yading@11:         oc = seg->avf;
yading@11: 
yading@11:         seg->cur_entry.index = seg->segment_idx;
yading@11:         seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
yading@11:         seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
yading@11:     } else if (pkt->pts != AV_NOPTS_VALUE) {
yading@11:         seg->cur_entry.end_time =
yading@11:             FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
yading@11:     }
yading@11: 
yading@11:     if (seg->is_first_pkt) {
yading@11:         av_log(s, AV_LOG_DEBUG, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
yading@11:                seg->avf->filename, pkt->stream_index,
yading@11:                av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
yading@11:         seg->is_first_pkt = 0;
yading@11:     }
yading@11: 
yading@11:     if (seg->reset_timestamps) {
yading@11:         av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
yading@11:                pkt->stream_index,
yading@11:                av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
yading@11:                av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
yading@11:                av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
yading@11: 
yading@11:         /* compute new timestamps */
yading@11:         if (pkt->pts != AV_NOPTS_VALUE)
yading@11:             pkt->pts -= av_rescale_q(seg->cur_entry.start_pts, AV_TIME_BASE_Q, st->time_base);
yading@11:         if (pkt->dts != AV_NOPTS_VALUE)
yading@11:             pkt->dts -= av_rescale_q(seg->cur_entry.start_pts, AV_TIME_BASE_Q, st->time_base);
yading@11: 
yading@11:         av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
yading@11:                av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
yading@11:                av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
yading@11:     }
yading@11: 
yading@11:     ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
yading@11: 
yading@11: fail:
yading@11:     if (pkt->stream_index == seg->reference_stream_index)
yading@11:         seg->frame_count++;
yading@11: 
yading@11:     if (ret < 0) {
yading@11:         if (seg->list)
yading@11:             avio_close(seg->list_pb);
yading@11:         avformat_free_context(oc);
yading@11:     }
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int seg_write_trailer(struct AVFormatContext *s)
yading@11: {
yading@11:     SegmentContext *seg = s->priv_data;
yading@11:     AVFormatContext *oc = seg->avf;
yading@11:     SegmentListEntry *cur, *next;
yading@11: 
yading@11:     int ret;
yading@11:     if (!seg->write_header_trailer) {
yading@11:         if ((ret = segment_end(s, 0, 1)) < 0)
yading@11:             goto fail;
yading@11:         open_null_ctx(&oc->pb);
yading@11:         ret = av_write_trailer(oc);
yading@11:         close_null_ctx(oc->pb);
yading@11:     } else {
yading@11:         ret = segment_end(s, 1, 1);
yading@11:     }
yading@11: fail:
yading@11:     if (seg->list)
yading@11:         avio_close(seg->list_pb);
yading@11: 
yading@11:     av_opt_free(seg);
yading@11:     av_freep(&seg->times);
yading@11:     av_freep(&seg->frames);
yading@11: 
yading@11:     cur = seg->segment_list_entries;
yading@11:     while (cur) {
yading@11:         next = cur->next;
yading@11:         av_free(cur);
yading@11:         cur = next;
yading@11:     }
yading@11: 
yading@11:     avformat_free_context(oc);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: #define OFFSET(x) offsetof(SegmentContext, x)
yading@11: #define E AV_OPT_FLAG_ENCODING_PARAM
yading@11: static const AVOption options[] = {
yading@11:     { "reference_stream",  "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
yading@11:     { "segment_format",    "set container format used for the segments", OFFSET(format),  AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
yading@11:     { "segment_list",      "set the segment list filename",              OFFSET(list),    AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
yading@11: 
yading@11:     { "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"},
yading@11:     { "cache",             "allow list caching",                                    0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX,   E, "list_flags"},
yading@11:     { "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"},
yading@11: 
yading@11:     { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT,  {.i64 = 0},     0, INT_MAX, E },
yading@11: 
yading@11:     { "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" },
yading@11:     { "flat", "flat format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
yading@11:     { "csv",  "csv format",      0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV  }, INT_MIN, INT_MAX, E, "list_type" },
yading@11:     { "ext",  "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT  }, INT_MIN, INT_MAX, E, "list_type" },
yading@11:     { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
yading@11:     { "m3u8", "M3U8 format",     0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
yading@11:     { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
yading@11: 
yading@11:     { "segment_time",      "set segment duration",                       OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E },
yading@11:     { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E },
yading@11:     { "segment_times",     "set segment split time points",              OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
yading@11:     { "segment_frames",    "set segment split frame numbers",            OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL},  0, 0,       E },
yading@11:     { "segment_wrap",      "set number after which the index wraps",     OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
yading@11:     { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
yading@11: 
yading@11:     { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
yading@11:     { "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 },
yading@11:     { "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
yading@11:     { NULL },
yading@11: };
yading@11: 
yading@11: static const AVClass seg_class = {
yading@11:     .class_name = "segment muxer",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: AVOutputFormat ff_segment_muxer = {
yading@11:     .name           = "segment",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("segment"),
yading@11:     .priv_data_size = sizeof(SegmentContext),
yading@11:     .flags          = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
yading@11:     .write_header   = seg_write_header,
yading@11:     .write_packet   = seg_write_packet,
yading@11:     .write_trailer  = seg_write_trailer,
yading@11:     .priv_class     = &seg_class,
yading@11: };
yading@11: 
yading@11: static const AVClass sseg_class = {
yading@11:     .class_name = "stream_segment muxer",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: AVOutputFormat ff_stream_segment_muxer = {
yading@11:     .name           = "stream_segment,ssegment",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
yading@11:     .priv_data_size = sizeof(SegmentContext),
yading@11:     .flags          = AVFMT_NOFILE,
yading@11:     .write_header   = seg_write_header,
yading@11:     .write_packet   = seg_write_packet,
yading@11:     .write_trailer  = seg_write_trailer,
yading@11:     .priv_class     = &sseg_class,
yading@11: };