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FFmpeg/libavformat/segment.c

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/*
* Copyright (c) 2011, Luca Barbato
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file generic segmenter
* M3U8 specification can be find here:
* @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
*/
/* #define DEBUG */
#include <float.h>
#include <time.h>
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavutil/avassert.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/parseutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/time.h"
#include "libavutil/timecode.h"
#include "libavutil/time_internal.h"
#include "libavutil/timestamp.h"
typedef struct SegmentListEntry {
int index;
double start_time, end_time;
int64_t start_pts;
int64_t offset_pts;
char *filename;
struct SegmentListEntry *next;
int64_t last_duration;
} SegmentListEntry;
typedef enum {
LIST_TYPE_UNDEFINED = -1,
LIST_TYPE_FLAT = 0,
LIST_TYPE_CSV,
LIST_TYPE_M3U8,
LIST_TYPE_EXT, ///< deprecated
LIST_TYPE_FFCONCAT,
LIST_TYPE_NB,
} ListType;
#define SEGMENT_LIST_FLAG_CACHE 1
#define SEGMENT_LIST_FLAG_LIVE 2
typedef struct SegmentContext {
const AVClass *class; /**< Class for private options. */
int segment_idx; ///< index of the segment file to write, starting from 0
int segment_idx_wrap; ///< number after which the index wraps
int segment_idx_wrap_nb; ///< number of time the index has wraped
int segment_count; ///< number of segment files already written
AVOutputFormat *oformat;
AVFormatContext *avf;
char *format; ///< format to use for output segment files
char *format_options_str; ///< format options to use for output segment files
AVDictionary *format_options;
char *list; ///< filename for the segment list file
int list_flags; ///< flags affecting list generation
int list_size; ///< number of entries for the segment list file
int use_clocktime; ///< flag to cut segments at regular clock time
int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
int64_t last_val; ///< remember last time for wrap around detection
int64_t last_cut; ///< remember last cut
int cut_pending;
char *entry_prefix; ///< prefix to add to list entry filenames
int list_type; ///< set the list type
AVIOContext *list_pb; ///< list file put-byte context
char *time_str; ///< segment duration specification string
int64_t time; ///< segment duration
int use_strftime; ///< flag to expand filename with strftime
int increment_tc; ///< flag to increment timecode if found
char *times_str; ///< segment times specification string
int64_t *times; ///< list of segment interval specification
int nb_times; ///< number of elments in the times array
char *frames_str; ///< segment frame numbers specification string
int *frames; ///< list of frame number specification
int nb_frames; ///< number of elments in the frames array
int frame_count; ///< total number of reference frames
int segment_frame_count; ///< number of reference frames in the segment
int64_t time_delta;
int individual_header_trailer; /**< Set by a private option. */
int write_header_trailer; /**< Set by a private option. */
char *header_filename; ///< filename to write the output header to
int reset_timestamps; ///< reset timestamps at the begin of each segment
int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
char *reference_stream_specifier; ///< reference stream specifier
int reference_stream_index;
int break_non_keyframes;
int write_empty;
int use_rename;
char temp_list_filename[1024];
SegmentListEntry cur_entry;
SegmentListEntry *segment_list_entries;
SegmentListEntry *segment_list_entries_end;
} SegmentContext;
static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
{
int needs_quoting = !!str[strcspn(str, "\",\n\r")];
if (needs_quoting)
avio_w8(ctx, '"');
for (; *str; str++) {
if (*str == '"')
avio_w8(ctx, '"');
avio_w8(ctx, *str);
}
if (needs_quoting)
avio_w8(ctx, '"');
}
static int segment_mux_init(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc;
int i;
int ret;
ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
if (ret < 0)
return ret;
oc = seg->avf;
oc->interrupt_callback = s->interrupt_callback;
oc->max_delay = s->max_delay;
av_dict_copy(&oc->metadata, s->metadata, 0);
oc->opaque = s->opaque;
oc->io_close = s->io_close;
oc->io_open = s->io_open;
oc->flags = s->flags;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st;
AVCodecParameters *ipar, *opar;
if (!(st = avformat_new_stream(oc, NULL)))
return AVERROR(ENOMEM);
ipar = s->streams[i]->codecpar;
opar = st->codecpar;
avcodec_parameters_copy(opar, ipar);
if (!oc->oformat->codec_tag ||
av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
opar->codec_tag = ipar->codec_tag;
} else {
opar->codec_tag = 0;
}
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
st->time_base = s->streams[i]->time_base;
av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
}
return 0;
}
static int set_segment_filename(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
size_t size;
int ret;
if (seg->segment_idx_wrap)
seg->segment_idx %= seg->segment_idx_wrap;
if (seg->use_strftime) {
time_t now0;
struct tm *tm, tmpbuf;
time(&now0);
tm = localtime_r(&now0, &tmpbuf);
if (!strftime(oc->filename, sizeof(oc->filename), s->filename, tm)) {
av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
return AVERROR(EINVAL);
}
} else if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
s->filename, seg->segment_idx) < 0) {
av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
return AVERROR(EINVAL);
}
/* copy modified name in list entry */
size = strlen(av_basename(oc->filename)) + 1;
if (seg->entry_prefix)
size += strlen(seg->entry_prefix);
if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
return ret;
snprintf(seg->cur_entry.filename, size, "%s%s",
seg->entry_prefix ? seg->entry_prefix : "",
av_basename(oc->filename));
return 0;
}
static int segment_start(AVFormatContext *s, int write_header)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
int err = 0;
if (write_header) {
avformat_free_context(oc);
seg->avf = NULL;
if ((err = segment_mux_init(s)) < 0)
return err;
oc = seg->avf;
}
seg->segment_idx++;
if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
seg->segment_idx_wrap_nb++;
if ((err = set_segment_filename(s)) < 0)
return err;
if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
return err;
}
if (!seg->individual_header_trailer)
oc->pb->seekable = 0;
if (oc->oformat->priv_class && oc->priv_data)
av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
if (write_header) {
AVDictionary *options = NULL;
av_dict_copy(&options, seg->format_options, 0);
err = avformat_write_header(oc, &options);
av_dict_free(&options);
if (err < 0)
return err;
}
seg->segment_frame_count = 0;
return 0;
}
static int segment_list_open(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
int ret;
snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
return ret;
}
if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
SegmentListEntry *entry;
double max_duration = 0;
avio_printf(seg->list_pb, "#EXTM3U\n");
avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
seg->segment_list_entries->index);
for (entry = seg->segment_list_entries; entry; entry = entry->next)
max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
} else if (seg->list_type == LIST_TYPE_FFCONCAT) {
avio_printf(seg->list_pb, "ffconcat version 1.0\n");
}
return ret;
}
static void segment_list_print_entry(AVIOContext *list_ioctx,
ListType list_type,
const SegmentListEntry *list_entry,
void *log_ctx)
{
switch (list_type) {
case LIST_TYPE_FLAT:
avio_printf(list_ioctx, "%s\n", list_entry->filename);
break;
case LIST_TYPE_CSV:
case LIST_TYPE_EXT:
print_csv_escaped_str(list_ioctx, list_entry->filename);
avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
break;
case LIST_TYPE_M3U8:
avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
list_entry->end_time - list_entry->start_time, list_entry->filename);
break;
case LIST_TYPE_FFCONCAT:
{
char *buf;
if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
av_log(log_ctx, AV_LOG_WARNING,
"Error writing list entry '%s' in list file\n", list_entry->filename);
return;
}
avio_printf(list_ioctx, "file %s\n", buf);
av_free(buf);
break;
}
default:
av_assert0(!"Invalid list type");
}
}
static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
int ret = 0;
AVTimecode tc;
AVRational rate;
AVDictionaryEntry *tcr;
char buf[AV_TIMECODE_STR_SIZE];
int i;
int err;
av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
if (write_trailer)
ret = av_write_trailer(oc);
if (ret < 0)
av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
oc->filename);
if (seg->list) {
if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
SegmentListEntry *entry = av_mallocz(sizeof(*entry));
if (!entry) {
ret = AVERROR(ENOMEM);
goto end;
}
/* append new element */
memcpy(entry, &seg->cur_entry, sizeof(*entry));
entry->filename = av_strdup(entry->filename);
if (!seg->segment_list_entries)
seg->segment_list_entries = seg->segment_list_entries_end = entry;
else
seg->segment_list_entries_end->next = entry;
seg->segment_list_entries_end = entry;
/* drop first item */
if (seg->list_size && seg->segment_count >= seg->list_size) {
entry = seg->segment_list_entries;
seg->segment_list_entries = seg->segment_list_entries->next;
av_freep(&entry->filename);
av_freep(&entry);
}
if ((ret = segment_list_open(s)) < 0)
goto end;
for (entry = seg->segment_list_entries; entry; entry = entry->next)
segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
if (seg->list_type == LIST_TYPE_M3U8 && is_last)
avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
ff_format_io_close(s, &seg->list_pb);
if (seg->use_rename)
ff_rename(seg->temp_list_filename, seg->list, s);
} else {
segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
avio_flush(seg->list_pb);
}
}
av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
seg->avf->filename, seg->segment_count);
seg->segment_count++;
if (seg->increment_tc) {
tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
if (tcr) {
/* search the first video stream */
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
if (err < 0) {
av_log(s, AV_LOG_WARNING, "Could not increment timecode, error occurred during timecode creation.");
break;
}
tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
av_dict_set(&s->metadata, "timecode",
av_timecode_make_string(&tc, buf, 0), 0);
break;
}
}
} else {
av_log(s, AV_LOG_WARNING, "Could not increment timecode, no timecode metadata found");
}
}
end:
ff_format_io_close(oc, &oc->pb);
return ret;
}
static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
const char *times_str)
{
char *p;
int i, ret = 0;
char *times_str1 = av_strdup(times_str);
char *saveptr = NULL;
if (!times_str1)
return AVERROR(ENOMEM);
#define FAIL(err) ret = err; goto end
*nb_times = 1;
for (p = times_str1; *p; p++)
if (*p == ',')
(*nb_times)++;
*times = av_malloc_array(*nb_times, sizeof(**times));
if (!*times) {
av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
FAIL(AVERROR(ENOMEM));
}
p = times_str1;
for (i = 0; i < *nb_times; i++) {
int64_t t;
char *tstr = av_strtok(p, ",", &saveptr);
p = NULL;
if (!tstr || !tstr[0]) {
av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
times_str);
FAIL(AVERROR(EINVAL));
}
ret = av_parse_time(&t, tstr, 1);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
FAIL(AVERROR(EINVAL));
}
(*times)[i] = t;
/* check on monotonicity */
if (i && (*times)[i-1] > (*times)[i]) {
av_log(log_ctx, AV_LOG_ERROR,
"Specified time %f is greater than the following time %f\n",
(float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
FAIL(AVERROR(EINVAL));
}
}
end:
av_free(times_str1);
return ret;
}
static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
const char *frames_str)
{
char *p;
int i, ret = 0;
char *frames_str1 = av_strdup(frames_str);
char *saveptr = NULL;
if (!frames_str1)
return AVERROR(ENOMEM);
#define FAIL(err) ret = err; goto end
*nb_frames = 1;
for (p = frames_str1; *p; p++)
if (*p == ',')
(*nb_frames)++;
*frames = av_malloc_array(*nb_frames, sizeof(**frames));
if (!*frames) {
av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
FAIL(AVERROR(ENOMEM));
}
p = frames_str1;
for (i = 0; i < *nb_frames; i++) {
long int f;
char *tailptr;
char *fstr = av_strtok(p, ",", &saveptr);
p = NULL;
if (!fstr) {
av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
frames_str);
FAIL(AVERROR(EINVAL));
}
f = strtol(fstr, &tailptr, 10);
if (*tailptr || f <= 0 || f >= INT_MAX) {
av_log(log_ctx, AV_LOG_ERROR,
"Invalid argument '%s', must be a positive integer <= INT64_MAX\n",
fstr);
FAIL(AVERROR(EINVAL));
}
(*frames)[i] = f;
/* check on monotonicity */
if (i && (*frames)[i-1] > (*frames)[i]) {
av_log(log_ctx, AV_LOG_ERROR,
"Specified frame %d is greater than the following frame %d\n",
(*frames)[i], (*frames)[i-1]);
FAIL(AVERROR(EINVAL));
}
}
end:
av_free(frames_str1);
return ret;
}
static int open_null_ctx(AVIOContext **ctx)
{
int buf_size = 32768;
uint8_t *buf = av_malloc(buf_size);
if (!buf)
return AVERROR(ENOMEM);
*ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
if (!*ctx) {
av_free(buf);
return AVERROR(ENOMEM);
}
return 0;
}
static void close_null_ctxp(AVIOContext **pb)
{
av_freep(&(*pb)->buffer);
av_freep(pb);
}
static int select_reference_stream(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
int ret, i;
seg->reference_stream_index = -1;
if (!strcmp(seg->reference_stream_specifier, "auto")) {
/* select first index of type with highest priority */
int type_index_map[AVMEDIA_TYPE_NB];
static const enum AVMediaType type_priority_list[] = {
AVMEDIA_TYPE_VIDEO,
AVMEDIA_TYPE_AUDIO,
AVMEDIA_TYPE_SUBTITLE,
AVMEDIA_TYPE_DATA,
AVMEDIA_TYPE_ATTACHMENT
};
enum AVMediaType type;
for (i = 0; i < AVMEDIA_TYPE_NB; i++)
type_index_map[i] = -1;
/* select first index for each type */
for (i = 0; i < s->nb_streams; i++) {
type = s->streams[i]->codecpar->codec_type;
if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
/* ignore attached pictures/cover art streams */
&& !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
type_index_map[type] = i;
}
for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
type = type_priority_list[i];
if ((seg->reference_stream_index = type_index_map[type]) >= 0)
break;
}
} else {
for (i = 0; i < s->nb_streams; i++) {
ret = avformat_match_stream_specifier(s, s->streams[i],
seg->reference_stream_specifier);
if (ret < 0)
return ret;
if (ret > 0) {
seg->reference_stream_index = i;
break;
}
}
}
if (seg->reference_stream_index < 0) {
av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
seg->reference_stream_specifier);
return AVERROR(EINVAL);
}
return 0;
}
static void seg_free_context(SegmentContext *seg)
{
ff_format_io_close(seg->avf, &seg->list_pb);
avformat_free_context(seg->avf);
seg->avf = NULL;
}
static int seg_init(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
AVDictionary *options = NULL;
int ret;
int i;
seg->segment_count = 0;
if (!seg->write_header_trailer)
seg->individual_header_trailer = 0;
if (seg->header_filename) {
seg->write_header_trailer = 1;
seg->individual_header_trailer = 0;
}
if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
av_log(s, AV_LOG_ERROR,
"segment_time, segment_times, and segment_frames options "
"are mutually exclusive, select just one of them\n");
return AVERROR(EINVAL);
}
if (seg->times_str) {
if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
return ret;
} else if (seg->frames_str) {
if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
return ret;
} else {
/* set default value if not specified */
if (!seg->time_str)
seg->time_str = av_strdup("2");
if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
av_log(s, AV_LOG_ERROR,
"Invalid time duration specification '%s' for segment_time option\n",
seg->time_str);
return ret;
}
if (seg->use_clocktime) {
if (seg->time <= 0) {
av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
return AVERROR(EINVAL);
}
seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
}
}
if (seg->format_options_str) {
ret = av_dict_parse_string(&seg->format_options, seg->format_options_str, "=", ":", 0);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n",
seg->format_options_str);
goto fail;
}
}
if (seg->list) {
if (seg->list_type == LIST_TYPE_UNDEFINED) {
if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
else seg->list_type = LIST_TYPE_FLAT;
}
if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
if ((ret = segment_list_open(s)) < 0)
goto fail;
} else {
const char *proto = avio_find_protocol_name(s->filename);
seg->use_rename = proto && !strcmp(proto, "file");
}
}
if (seg->list_type == LIST_TYPE_EXT)
av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
if ((ret = select_reference_stream(s)) < 0)
goto fail;
av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
seg->reference_stream_index,
av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
seg->oformat = av_guess_format(seg->format, s->filename, NULL);
if (!seg->oformat) {
ret = AVERROR_MUXER_NOT_FOUND;
goto fail;
}
if (seg->oformat->flags & AVFMT_NOFILE) {
av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
seg->oformat->name);
ret = AVERROR(EINVAL);
goto fail;
}
if ((ret = segment_mux_init(s)) < 0)
goto fail;
if ((ret = set_segment_filename(s)) < 0)
goto fail;
oc = seg->avf;
if (seg->write_header_trailer) {
if ((ret = s->io_open(s, &oc->pb,
seg->header_filename ? seg->header_filename : oc->filename,
AVIO_FLAG_WRITE, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
goto fail;
}
if (!seg->individual_header_trailer)
oc->pb->seekable = 0;
} else {
if ((ret = open_null_ctx(&oc->pb)) < 0)
goto fail;
}
av_dict_copy(&options, seg->format_options, 0);
ret = avformat_write_header(oc, &options);
if (av_dict_count(options)) {
av_log(s, AV_LOG_ERROR,
"Some of the provided format options in '%s' are not recognized\n", seg->format_options_str);
ret = AVERROR(EINVAL);
goto fail;
}
if (ret < 0) {
ff_format_io_close(oc, &oc->pb);
goto fail;
}
seg->segment_frame_count = 0;
av_assert0(s->nb_streams == oc->nb_streams);
for (i = 0; i < s->nb_streams; i++) {
AVStream *inner_st = oc->streams[i];
AVStream *outer_st = s->streams[i];
avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
}
if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
s->avoid_negative_ts = 1;
if (!seg->write_header_trailer || seg->header_filename) {
if (seg->header_filename) {
av_write_frame(oc, NULL);
ff_format_io_close(oc, &oc->pb);
} else {
close_null_ctxp(&oc->pb);
}
if ((ret = oc->io_open(oc, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
goto fail;
if (!seg->individual_header_trailer)
oc->pb->seekable = 0;
}
fail:
av_dict_free(&options);
if (ret < 0)
seg_free_context(seg);
return ret;
}
static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
SegmentContext *seg = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
int64_t end_pts = INT64_MAX, offset;
int start_frame = INT_MAX;
int ret;
struct tm ti;
int64_t usecs;
int64_t wrapped_val;
if (!seg->avf)
return AVERROR(EINVAL);
calc_times:
if (seg->times) {
end_pts = seg->segment_count < seg->nb_times ?
seg->times[seg->segment_count] : INT64_MAX;
} else if (seg->frames) {
start_frame = seg->segment_count < seg->nb_frames ?
seg->frames[seg->segment_count] : INT_MAX;
} else {
if (seg->use_clocktime) {
int64_t avgt = av_gettime();
time_t sec = avgt / 1000000;
localtime_r(&sec, &ti);
usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
if (seg->last_cut != usecs && wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration) {
seg->cut_pending = 1;
seg->last_cut = usecs;
}
seg->last_val = wrapped_val;
} else {
end_pts = seg->time * (seg->segment_count + 1);
}
}
ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
av_ts2timestr(pkt->duration, &st->time_base),
pkt->flags & AV_PKT_FLAG_KEY,
pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
if (pkt->stream_index == seg->reference_stream_index &&
(pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
(seg->segment_frame_count > 0 || seg->write_empty) &&
(seg->cut_pending || seg->frame_count >= start_frame ||
(pkt->pts != AV_NOPTS_VALUE &&
av_compare_ts(pkt->pts, st->time_base,
end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
/* sanitize end time in case last packet didn't have a defined duration */
if (seg->cur_entry.last_duration == 0)
seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
goto fail;
if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
goto fail;
seg->cut_pending = 0;
seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
seg->cur_entry.end_time = seg->cur_entry.start_time;
if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
goto calc_times;
}
if (pkt->stream_index == seg->reference_stream_index) {
if (pkt->pts != AV_NOPTS_VALUE)
seg->cur_entry.end_time =
FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
seg->cur_entry.last_duration = pkt->duration;
}
if (seg->segment_frame_count == 0) {
av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
seg->avf->filename, pkt->stream_index,
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
}
av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
pkt->stream_index,
av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
/* compute new timestamps */
offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
AV_TIME_BASE_Q, st->time_base);
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += offset;
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += offset;
av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s, seg->initial_offset || seg->reset_timestamps);
fail:
if (pkt->stream_index == seg->reference_stream_index) {
seg->frame_count++;
seg->segment_frame_count++;
}
if (ret < 0)
seg_free_context(seg);
return ret;
}
static int seg_write_trailer(struct AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
SegmentListEntry *cur, *next;
int ret = 0;
if (!oc)
goto fail;
if (!seg->write_header_trailer) {
if ((ret = segment_end(s, 0, 1)) < 0)
goto fail;
if ((ret = open_null_ctx(&oc->pb)) < 0)
goto fail;
ret = av_write_trailer(oc);
close_null_ctxp(&oc->pb);
} else {
ret = segment_end(s, 1, 1);
}
fail:
if (seg->list)
ff_format_io_close(s, &seg->list_pb);
av_dict_free(&seg->format_options);
av_opt_free(seg);
av_freep(&seg->times);
av_freep(&seg->frames);
av_freep(&seg->cur_entry.filename);
cur = seg->segment_list_entries;
while (cur) {
next = cur->next;
av_freep(&cur->filename);
av_free(cur);
cur = next;
}
avformat_free_context(oc);
seg->avf = NULL;
return ret;
}
#define OFFSET(x) offsetof(SegmentContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, CHAR_MIN, CHAR_MAX, E },
{ "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "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 },
{ "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "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"},
{ "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
{ "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"},
{ "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "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" },
{ "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
{ "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
{ "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
{ "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
{ "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
{ "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
{ "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
{ "segment_clocktime_offset", "set segment clocktime offset", OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
{ "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
{ "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 0, E },
{ "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
{ "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
{ "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "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 },
{ "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
{ "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
{ "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
{ "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
{ "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 },
{ "reset_timestamps", "reset timestamps at the begin of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
{ "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
{ "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
{ NULL },
};
static const AVClass seg_class = {
.class_name = "segment muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_segment_muxer = {
.name = "segment",
.long_name = NULL_IF_CONFIG_SMALL("segment"),
.priv_data_size = sizeof(SegmentContext),
.flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
.init = seg_init,
.write_packet = seg_write_packet,
.write_trailer = seg_write_trailer,
.priv_class = &seg_class,
};
static const AVClass sseg_class = {
.class_name = "stream_segment muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVOutputFormat ff_stream_segment_muxer = {
.name = "stream_segment,ssegment",
.long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
.priv_data_size = sizeof(SegmentContext),
.flags = AVFMT_NOFILE,
.init = seg_init,
.write_packet = seg_write_packet,
.write_trailer = seg_write_trailer,
.priv_class = &sseg_class,
};