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ffmpeg/libavformat/dashenc.c

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/*
* MPEG-DASH ISO BMFF segmenter
* Copyright (c) 2014 Martin Storsjo
* Copyright (c) 2018 Akamai Technologies, Inc.
*
* 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
*/
#include "config.h"
#include "config_components.h"
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/rational.h"
#include "libavutil/time.h"
#include "libavutil/time_internal.h"
#include "libavcodec/avcodec.h"
#include "av1.h"
#include "avc.h"
#include "avformat.h"
#include "avio_internal.h"
#include "hlsplaylist.h"
#if CONFIG_HTTP_PROTOCOL
#include "http.h"
#endif
#include "internal.h"
#include "isom.h"
#include "mux.h"
#include "os_support.h"
#include "url.h"
#include "vpcc.h"
#include "dash.h"
typedef enum {
SEGMENT_TYPE_AUTO = 0,
SEGMENT_TYPE_MP4,
SEGMENT_TYPE_WEBM,
SEGMENT_TYPE_NB
} SegmentType;
enum {
FRAG_TYPE_NONE = 0,
FRAG_TYPE_EVERY_FRAME,
FRAG_TYPE_DURATION,
FRAG_TYPE_PFRAMES,
FRAG_TYPE_NB
};
#define MPD_PROFILE_DASH 1
#define MPD_PROFILE_DVB 2
typedef struct Segment {
char file[1024];
int64_t start_pos;
int range_length, index_length;
int64_t time;
double prog_date_time;
int64_t duration;
int n;
} Segment;
typedef struct AdaptationSet {
int id;
char *descriptor;
int64_t seg_duration;
int64_t frag_duration;
int frag_type;
enum AVMediaType media_type;
AVDictionary *metadata;
AVRational min_frame_rate, max_frame_rate;
int ambiguous_frame_rate;
int64_t max_frag_duration;
int max_width, max_height;
int nb_streams;
AVRational par;
int trick_idx;
} AdaptationSet;
typedef struct OutputStream {
AVFormatContext *ctx;
int ctx_inited, as_idx;
AVIOContext *out;
AVCodecParserContext *parser;
AVCodecContext *parser_avctx;
int packets_written;
char initfile[1024];
int64_t init_start_pos, pos;
int init_range_length;
int nb_segments, segments_size, segment_index;
int64_t seg_duration;
int64_t frag_duration;
int64_t last_duration;
Segment **segments;
int64_t first_pts, start_pts, max_pts;
int64_t last_dts, last_pts;
int last_flags;
int bit_rate;
int first_segment_bit_rate;
SegmentType segment_type; /* segment type selected for this particular stream */
const char *format_name;
const char *extension_name;
const char *single_file_name; /* file names selected for this particular stream */
const char *init_seg_name;
const char *media_seg_name;
char codec_str[100];
int written_len;
char filename[1024];
char full_path[1024];
char temp_path[1024];
double availability_time_offset;
AVProducerReferenceTime producer_reference_time;
char producer_reference_time_str[100];
int total_pkt_size;
int64_t total_pkt_duration;
int muxer_overhead;
int frag_type;
int64_t gop_size;
AVRational sar;
int coding_dependency;
} OutputStream;
typedef struct DASHContext {
const AVClass *class; /* Class for private options. */
char *adaptation_sets;
AdaptationSet *as;
int nb_as;
int window_size;
int extra_window_size;
int64_t seg_duration;
int64_t frag_duration;
int remove_at_exit;
int use_template;
int use_timeline;
int single_file;
OutputStream *streams;
int has_video;
int64_t last_duration;
int64_t total_duration;
char availability_start_time[100];
time_t start_time_s;
int64_t presentation_time_offset;
char dirname[1024];
const char *single_file_name; /* file names as specified in options */
const char *init_seg_name;
const char *media_seg_name;
const char *utc_timing_url;
const char *method;
const char *user_agent;
AVDictionary *http_opts;
int hls_playlist;
const char *hls_master_name;
int http_persistent;
int master_playlist_created;
AVIOContext *mpd_out;
AVIOContext *m3u8_out;
int streaming;
int64_t timeout;
int index_correction;
AVDictionary *format_options;
int global_sidx;
SegmentType segment_type_option; /* segment type as specified in options */
int ignore_io_errors;
int lhls;
int ldash;
int master_publish_rate;
int nr_of_streams_to_flush;
int nr_of_streams_flushed;
int frag_type;
int write_prft;
int64_t max_gop_size;
int64_t max_segment_duration;
int profile;
int64_t target_latency;
int target_latency_refid;
AVRational min_playback_rate;
AVRational max_playback_rate;
int64_t update_period;
} DASHContext;
static struct codec_string {
int id;
const char *str;
} codecs[] = {
{ AV_CODEC_ID_VP8, "vp8" },
{ AV_CODEC_ID_VP9, "vp9" },
{ AV_CODEC_ID_VORBIS, "vorbis" },
{ AV_CODEC_ID_OPUS, "opus" },
{ AV_CODEC_ID_FLAC, "flac" },
{ 0, NULL }
};
static struct format_string {
SegmentType segment_type;
const char *str;
} formats[] = {
{ SEGMENT_TYPE_AUTO, "auto" },
{ SEGMENT_TYPE_MP4, "mp4" },
{ SEGMENT_TYPE_WEBM, "webm" },
{ 0, NULL }
};
static int dashenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename,
AVDictionary **options) {
DASHContext *c = s->priv_data;
int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
int err = AVERROR_MUXER_NOT_FOUND;
if (!*pb || !http_base_proto || !c->http_persistent) {
err = s->io_open(s, pb, filename, AVIO_FLAG_WRITE, options);
#if CONFIG_HTTP_PROTOCOL
} else {
URLContext *http_url_context = ffio_geturlcontext(*pb);
av_assert0(http_url_context);
err = ff_http_do_new_request(http_url_context, filename);
if (err < 0)
ff_format_io_close(s, pb);
#endif
}
return err;
}
static void dashenc_io_close(AVFormatContext *s, AVIOContext **pb, char *filename) {
DASHContext *c = s->priv_data;
int http_base_proto = filename ? ff_is_http_proto(filename) : 0;
if (!*pb)
return;
if (!http_base_proto || !c->http_persistent) {
ff_format_io_close(s, pb);
#if CONFIG_HTTP_PROTOCOL
} else {
URLContext *http_url_context = ffio_geturlcontext(*pb);
av_assert0(http_url_context);
avio_flush(*pb);
ffurl_shutdown(http_url_context, AVIO_FLAG_WRITE);
#endif
}
}
static const char *get_format_str(SegmentType segment_type) {
int i;
for (i = 0; i < SEGMENT_TYPE_NB; i++)
if (formats[i].segment_type == segment_type)
return formats[i].str;
return NULL;
}
static const char *get_extension_str(SegmentType type, int single_file)
{
switch (type) {
case SEGMENT_TYPE_MP4: return single_file ? "mp4" : "m4s";
case SEGMENT_TYPE_WEBM: return "webm";
default: return NULL;
}
}
static int handle_io_open_error(AVFormatContext *s, int err, char *url) {
DASHContext *c = s->priv_data;
char errbuf[AV_ERROR_MAX_STRING_SIZE];
av_strerror(err, errbuf, sizeof(errbuf));
av_log(s, c->ignore_io_errors ? AV_LOG_WARNING : AV_LOG_ERROR,
"Unable to open %s for writing: %s\n", url, errbuf);
return c->ignore_io_errors ? 0 : err;
}
static inline SegmentType select_segment_type(SegmentType segment_type, enum AVCodecID codec_id)
{
if (segment_type == SEGMENT_TYPE_AUTO) {
if (codec_id == AV_CODEC_ID_OPUS || codec_id == AV_CODEC_ID_VORBIS ||
codec_id == AV_CODEC_ID_VP8 || codec_id == AV_CODEC_ID_VP9) {
segment_type = SEGMENT_TYPE_WEBM;
} else {
segment_type = SEGMENT_TYPE_MP4;
}
}
return segment_type;
}
static int init_segment_types(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
int has_mp4_streams = 0;
for (int i = 0; i < s->nb_streams; ++i) {
OutputStream *os = &c->streams[i];
SegmentType segment_type = select_segment_type(
c->segment_type_option, s->streams[i]->codecpar->codec_id);
os->segment_type = segment_type;
os->format_name = get_format_str(segment_type);
if (!os->format_name) {
av_log(s, AV_LOG_ERROR, "Could not select DASH segment type for stream %d\n", i);
return AVERROR_MUXER_NOT_FOUND;
}
os->extension_name = get_extension_str(segment_type, c->single_file);
if (!os->extension_name) {
av_log(s, AV_LOG_ERROR, "Could not get extension type for stream %d\n", i);
return AVERROR_MUXER_NOT_FOUND;
}
has_mp4_streams |= segment_type == SEGMENT_TYPE_MP4;
}
if (c->hls_playlist && !has_mp4_streams) {
av_log(s, AV_LOG_WARNING, "No mp4 streams, disabling HLS manifest generation\n");
c->hls_playlist = 0;
}
return 0;
}
static void set_vp9_codec_str(AVFormatContext *s, AVCodecParameters *par,
AVRational *frame_rate, char *str, int size) {
VPCC vpcc;
int ret = ff_isom_get_vpcc_features(s, par, NULL, 0, frame_rate, &vpcc);
if (ret == 0) {
av_strlcatf(str, size, "vp09.%02d.%02d.%02d",
vpcc.profile, vpcc.level, vpcc.bitdepth);
} else {
// Default to just vp9 in case of error while finding out profile or level
av_log(s, AV_LOG_WARNING, "Could not find VP9 profile and/or level\n");
av_strlcpy(str, "vp9", size);
}
return;
}
static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
AVRational *frame_rate, char *str, int size)
{
const AVCodecTag *tags[2] = { NULL, NULL };
uint32_t tag;
int i;
// common Webm codecs are not part of RFC 6381
for (i = 0; codecs[i].id; i++)
if (codecs[i].id == par->codec_id) {
if (codecs[i].id == AV_CODEC_ID_VP9) {
set_vp9_codec_str(s, par, frame_rate, str, size);
} else {
av_strlcpy(str, codecs[i].str, size);
}
return;
}
// for codecs part of RFC 6381
if (par->codec_type == AVMEDIA_TYPE_VIDEO)
tags[0] = ff_codec_movvideo_tags;
else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
tags[0] = ff_codec_movaudio_tags;
else
return;
tag = par->codec_tag;
if (!tag)
tag = av_codec_get_tag(tags, par->codec_id);
if (!tag)
return;
if (size < 5)
return;
AV_WL32(str, tag);
str[4] = '\0';
if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
uint32_t oti;
tags[0] = ff_mp4_obj_type;
oti = av_codec_get_tag(tags, par->codec_id);
if (oti)
av_strlcatf(str, size, ".%02"PRIx32, oti);
else
return;
if (tag == MKTAG('m', 'p', '4', 'a')) {
if (par->extradata_size >= 2) {
int aot = par->extradata[0] >> 3;
if (aot == 31)
aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
av_strlcatf(str, size, ".%d", aot);
}
} else if (tag == MKTAG('m', 'p', '4', 'v')) {
// Unimplemented, should output ProfileLevelIndication as a decimal number
av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
}
} else if (!strcmp(str, "avc1")) {
uint8_t *tmpbuf = NULL;
uint8_t *extradata = par->extradata;
int extradata_size = par->extradata_size;
if (!extradata_size)
return;
if (extradata[0] != 1) {
AVIOContext *pb;
if (avio_open_dyn_buf(&pb) < 0)
return;
if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
ffio_free_dyn_buf(&pb);
return;
}
extradata_size = avio_close_dyn_buf(pb, &extradata);
tmpbuf = extradata;
}
if (extradata_size >= 4)
av_strlcatf(str, size, ".%02x%02x%02x",
extradata[1], extradata[2], extradata[3]);
av_free(tmpbuf);
} else if (!strcmp(str, "av01")) {
AV1SequenceParameters seq;
if (!par->extradata_size)
return;
if (ff_av1_parse_seq_header(&seq, par->extradata, par->extradata_size) < 0)
return;
av_strlcatf(str, size, ".%01u.%02u%s.%02u",
seq.profile, seq.level, seq.tier ? "H" : "M", seq.bitdepth);
if (seq.color_description_present_flag)
av_strlcatf(str, size, ".%01u.%01u%01u%01u.%02u.%02u.%02u.%01u",
seq.monochrome,
seq.chroma_subsampling_x, seq.chroma_subsampling_y, seq.chroma_sample_position,
seq.color_primaries, seq.transfer_characteristics, seq.matrix_coefficients,
seq.color_range);
}
}
static int flush_dynbuf(DASHContext *c, OutputStream *os, int *range_length)
{
uint8_t *buffer;
if (!os->ctx->pb) {
return AVERROR(EINVAL);
}
// flush
av_write_frame(os->ctx, NULL);
avio_flush(os->ctx->pb);
if (!c->single_file) {
// write out to file
*range_length = avio_close_dyn_buf(os->ctx->pb, &buffer);
os->ctx->pb = NULL;
if (os->out)
avio_write(os->out, buffer + os->written_len, *range_length - os->written_len);
os->written_len = 0;
av_free(buffer);
// re-open buffer
return avio_open_dyn_buf(&os->ctx->pb);
} else {
*range_length = avio_tell(os->ctx->pb) - os->pos;
return 0;
}
}
static void set_http_options(AVDictionary **options, DASHContext *c)
{
if (c->method)
av_dict_set(options, "method", c->method, 0);
av_dict_copy(options, c->http_opts, 0);
if (c->user_agent)
av_dict_set(options, "user_agent", c->user_agent, 0);
if (c->http_persistent)
av_dict_set_int(options, "multiple_requests", 1, 0);
if (c->timeout >= 0)
av_dict_set_int(options, "timeout", c->timeout, 0);
}
static void get_hls_playlist_name(char *playlist_name, int string_size,
const char *base_url, int id) {
if (base_url)
snprintf(playlist_name, string_size, "%smedia_%d.m3u8", base_url, id);
else
snprintf(playlist_name, string_size, "media_%d.m3u8", id);
}
static void get_start_index_number(OutputStream *os, DASHContext *c,
int *start_index, int *start_number) {
*start_index = 0;
*start_number = 1;
if (c->window_size) {
*start_index = FFMAX(os->nb_segments - c->window_size, 0);
*start_number = FFMAX(os->segment_index - c->window_size, 1);
}
}
static void write_hls_media_playlist(OutputStream *os, AVFormatContext *s,
int representation_id, int final,
char *prefetch_url) {
DASHContext *c = s->priv_data;
int timescale = os->ctx->streams[0]->time_base.den;
char temp_filename_hls[1024];
char filename_hls[1024];
AVDictionary *http_opts = NULL;
int target_duration = 0;
int ret = 0;
const char *proto = avio_find_protocol_name(c->dirname);
int use_rename = proto && !strcmp(proto, "file");
int i, start_index, start_number;
double prog_date_time = 0;
get_start_index_number(os, c, &start_index, &start_number);
if (!c->hls_playlist || start_index >= os->nb_segments ||
os->segment_type != SEGMENT_TYPE_MP4)
return;
get_hls_playlist_name(filename_hls, sizeof(filename_hls),
c->dirname, representation_id);
snprintf(temp_filename_hls, sizeof(temp_filename_hls), use_rename ? "%s.tmp" : "%s", filename_hls);
set_http_options(&http_opts, c);
ret = dashenc_io_open(s, &c->m3u8_out, temp_filename_hls, &http_opts);
av_dict_free(&http_opts);
if (ret < 0) {
handle_io_open_error(s, ret, temp_filename_hls);
return;
}
for (i = start_index; i < os->nb_segments; i++) {
Segment *seg = os->segments[i];
double duration = (double) seg->duration / timescale;
if (target_duration <= duration)
target_duration = lrint(duration);
}
ff_hls_write_playlist_header(c->m3u8_out, 6, -1, target_duration,
start_number, PLAYLIST_TYPE_NONE, 0);
ff_hls_write_init_file(c->m3u8_out, os->initfile, c->single_file,
os->init_range_length, os->init_start_pos);
for (i = start_index; i < os->nb_segments; i++) {
Segment *seg = os->segments[i];
if (fabs(prog_date_time) < 1e-7) {
if (os->nb_segments == 1)
prog_date_time = c->start_time_s;
else
prog_date_time = seg->prog_date_time;
}
seg->prog_date_time = prog_date_time;
ret = ff_hls_write_file_entry(c->m3u8_out, 0, c->single_file,
(double) seg->duration / timescale, 0,
seg->range_length, seg->start_pos, NULL,
c->single_file ? os->initfile : seg->file,
&prog_date_time, 0, 0, 0);
if (ret < 0) {
av_log(os->ctx, AV_LOG_WARNING, "ff_hls_write_file_entry get error\n");
}
}
if (prefetch_url)
avio_printf(c->m3u8_out, "#EXT-X-PREFETCH:%s\n", prefetch_url);
if (final)
ff_hls_write_end_list(c->m3u8_out);
dashenc_io_close(s, &c->m3u8_out, temp_filename_hls);
if (use_rename)
ff_rename(temp_filename_hls, filename_hls, os->ctx);
}
static int flush_init_segment(AVFormatContext *s, OutputStream *os)
{
DASHContext *c = s->priv_data;
int ret, range_length;
ret = flush_dynbuf(c, os, &range_length);
if (ret < 0)
return ret;
os->pos = os->init_range_length = range_length;
if (!c->single_file) {
char filename[1024];
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
dashenc_io_close(s, &os->out, filename);
}
return 0;
}
static void dash_free(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
int i, j;
if (c->as) {
for (i = 0; i < c->nb_as; i++) {
av_dict_free(&c->as[i].metadata);
av_freep(&c->as[i].descriptor);
}
av_freep(&c->as);
c->nb_as = 0;
}
if (!c->streams)
return;
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
if (os->ctx && os->ctx->pb) {
if (!c->single_file)
ffio_free_dyn_buf(&os->ctx->pb);
else
avio_close(os->ctx->pb);
}
ff_format_io_close(s, &os->out);
avformat_free_context(os->ctx);
avcodec_free_context(&os->parser_avctx);
av_parser_close(os->parser);
for (j = 0; j < os->nb_segments; j++)
av_free(os->segments[j]);
av_free(os->segments);
av_freep(&os->single_file_name);
av_freep(&os->init_seg_name);
av_freep(&os->media_seg_name);
}
av_freep(&c->streams);
ff_format_io_close(s, &c->mpd_out);
ff_format_io_close(s, &c->m3u8_out);
}
static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatContext *s,
int representation_id, int final)
{
DASHContext *c = s->priv_data;
int i, start_index, start_number;
get_start_index_number(os, c, &start_index, &start_number);
if (c->use_template) {
int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
if (!c->use_timeline) {
avio_printf(out, "duration=\"%"PRId64"\" ", os->seg_duration);
if (c->streaming && os->availability_time_offset)
avio_printf(out, "availabilityTimeOffset=\"%.3f\" ",
os->availability_time_offset);
}
if (c->streaming && os->availability_time_offset && !final)
avio_printf(out, "availabilityTimeComplete=\"false\" ");
avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\"", os->init_seg_name, os->media_seg_name, c->use_timeline ? start_number : 1);
if (c->presentation_time_offset)
avio_printf(out, " presentationTimeOffset=\"%"PRId64"\"", c->presentation_time_offset);
avio_printf(out, ">\n");
if (c->use_timeline) {
int64_t cur_time = 0;
avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
for (i = start_index; i < os->nb_segments; ) {
Segment *seg = os->segments[i];
int repeat = 0;
avio_printf(out, "\t\t\t\t\t\t<S ");
if (i == start_index || seg->time != cur_time) {
cur_time = seg->time;
avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
}
avio_printf(out, "d=\"%"PRId64"\" ", seg->duration);
while (i + repeat + 1 < os->nb_segments &&
os->segments[i + repeat + 1]->duration == seg->duration &&
os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
repeat++;
if (repeat > 0)
avio_printf(out, "r=\"%d\" ", repeat);
avio_printf(out, "/>\n");
i += 1 + repeat;
cur_time += (1 + repeat) * seg->duration;
}
avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
}
avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
} else if (c->single_file) {
avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, FFMIN(os->seg_duration, os->last_duration), start_number);
avio_printf(out, "\t\t\t\t\t<Initialization range=\"%"PRId64"-%"PRId64"\" />\n", os->init_start_pos, os->init_start_pos + os->init_range_length - 1);
for (i = start_index; i < os->nb_segments; i++) {
Segment *seg = os->segments[i];
avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
if (seg->index_length)
avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
avio_printf(out, "/>\n");
}
avio_printf(out, "\t\t\t\t</SegmentList>\n");
} else {
avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, FFMIN(os->seg_duration, os->last_duration), start_number);
avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
for (i = start_index; i < os->nb_segments; i++) {
Segment *seg = os->segments[i];
avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
}
avio_printf(out, "\t\t\t\t</SegmentList>\n");
}
if (!c->lhls || final) {
write_hls_media_playlist(os, s, representation_id, final, NULL);
}
}
static char *xmlescape(const char *str) {
int outlen = strlen(str)*3/2 + 6;
char *out = av_realloc(NULL, outlen + 1);
int pos = 0;
if (!out)
return NULL;
for (; *str; str++) {
if (pos + 6 > outlen) {
char *tmp;
outlen = 2 * outlen + 6;
tmp = av_realloc(out, outlen + 1);
if (!tmp) {
av_free(out);
return NULL;
}
out = tmp;
}
if (*str == '&') {
memcpy(&out[pos], "&amp;", 5);
pos += 5;
} else if (*str == '<') {
memcpy(&out[pos], "&lt;", 4);
pos += 4;
} else if (*str == '>') {
memcpy(&out[pos], "&gt;", 4);
pos += 4;
} else if (*str == '\'') {
memcpy(&out[pos], "&apos;", 6);
pos += 6;
} else if (*str == '\"') {
memcpy(&out[pos], "&quot;", 6);
pos += 6;
} else {
out[pos++] = *str;
}
}
out[pos] = '\0';
return out;
}
static void write_time(AVIOContext *out, int64_t time)
{
int seconds = time / AV_TIME_BASE;
int fractions = time % AV_TIME_BASE;
int minutes = seconds / 60;
int hours = minutes / 60;
seconds %= 60;
minutes %= 60;
avio_printf(out, "PT");
if (hours)
avio_printf(out, "%dH", hours);
if (hours || minutes)
avio_printf(out, "%dM", minutes);
avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
}
static void format_date(char *buf, int size, int64_t time_us)
{
struct tm *ptm, tmbuf;
int64_t time_ms = time_us / 1000;
const time_t time_s = time_ms / 1000;
int millisec = time_ms - (time_s * 1000);
ptm = gmtime_r(&time_s, &tmbuf);
if (ptm) {
int len;
if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S", ptm)) {
buf[0] = '\0';
return;
}
len = strlen(buf);
snprintf(buf + len, size - len, ".%03dZ", millisec);
}
}
static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_index,
int final)
{
DASHContext *c = s->priv_data;
AdaptationSet *as = &c->as[as_index];
AVDictionaryEntry *lang, *role;
int i;
avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"%s\" startWithSAP=\"1\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"",
as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
else if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && !av_cmp_q(as->min_frame_rate, as->max_frame_rate))
avio_printf(out, " frameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
if (as->media_type == AVMEDIA_TYPE_VIDEO) {
avio_printf(out, " maxWidth=\"%d\" maxHeight=\"%d\"", as->max_width, as->max_height);
avio_printf(out, " par=\"%d:%d\"", as->par.num, as->par.den);
}
lang = av_dict_get(as->metadata, "language", NULL, 0);
if (lang)
avio_printf(out, " lang=\"%s\"", lang->value);
avio_printf(out, ">\n");
if (!final && c->ldash && as->max_frag_duration && !(c->profile & MPD_PROFILE_DVB))
avio_printf(out, "\t\t\t<Resync dT=\"%"PRId64"\" type=\"0\"/>\n", as->max_frag_duration);
if (as->trick_idx >= 0)
avio_printf(out, "\t\t\t<EssentialProperty id=\"%d\" schemeIdUri=\"http://dashif.org/guidelines/trickmode\" value=\"%d\"/>\n", as->id, as->trick_idx);
role = av_dict_get(as->metadata, "role", NULL, 0);
if (role)
avio_printf(out, "\t\t\t<Role schemeIdUri=\"urn:mpeg:dash:role:2011\" value=\"%s\"/>\n", role->value);
if (as->descriptor)
avio_printf(out, "\t\t\t%s\n", as->descriptor);
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
OutputStream *os = &c->streams[i];
char bandwidth_str[64] = {'\0'};
if (os->as_idx - 1 != as_index)
continue;
if (os->bit_rate > 0)
snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"", os->bit_rate);
else if (final) {
int average_bit_rate = os->pos * 8 * AV_TIME_BASE / c->total_duration;
snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"", average_bit_rate);
} else if (os->first_segment_bit_rate > 0)
snprintf(bandwidth_str, sizeof(bandwidth_str), " bandwidth=\"%d\"", os->first_segment_bit_rate);
if (as->media_type == AVMEDIA_TYPE_VIDEO) {
avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
if (st->codecpar->field_order == AV_FIELD_UNKNOWN)
avio_printf(out, " scanType=\"unknown\"");
else if (st->codecpar->field_order != AV_FIELD_PROGRESSIVE)
avio_printf(out, " scanType=\"interlaced\"");
avio_printf(out, " sar=\"%d:%d\"", os->sar.num, os->sar.den);
if (st->avg_frame_rate.num && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
if (as->trick_idx >= 0) {
AdaptationSet *tas = &c->as[as->trick_idx];
if (!as->ambiguous_frame_rate && !tas->ambiguous_frame_rate)
avio_printf(out, " maxPlayoutRate=\"%d\"", FFMAX((int)av_q2d(av_div_q(tas->min_frame_rate, as->min_frame_rate)), 1));
}
if (!os->coding_dependency)
avio_printf(out, " codingDependency=\"false\"");
avio_printf(out, ">\n");
} else {
avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/%s\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n",
i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->sample_rate);
avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n",
s->streams[i]->codecpar->ch_layout.nb_channels);
}
if (!final && c->write_prft && os->producer_reference_time_str[0]) {
avio_printf(out, "\t\t\t\t<ProducerReferenceTime id=\"%d\" inband=\"true\" type=\"%s\" wallClockTime=\"%s\" presentationTime=\"%"PRId64"\">\n",
i, os->producer_reference_time.flags ? "captured" : "encoder", os->producer_reference_time_str, c->presentation_time_offset);
avio_printf(out, "\t\t\t\t\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
avio_printf(out, "\t\t\t\t</ProducerReferenceTime>\n");
}
if (!final && c->ldash && os->gop_size && os->frag_type != FRAG_TYPE_NONE && !(c->profile & MPD_PROFILE_DVB) &&
(os->frag_type != FRAG_TYPE_DURATION || os->frag_duration != os->seg_duration))
avio_printf(out, "\t\t\t\t<Resync dT=\"%"PRId64"\" type=\"1\"/>\n", os->gop_size);
output_segment_list(os, out, s, i, final);
avio_printf(out, "\t\t\t</Representation>\n");
}
avio_printf(out, "\t\t</AdaptationSet>\n");
return 0;
}
static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
{
DASHContext *c = s->priv_data;
void *mem;
if (c->profile & MPD_PROFILE_DVB && (c->nb_as + 1) > 16) {
av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Adaptation Sets\n");
return AVERROR(EINVAL);
}
mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
if (!mem)
return AVERROR(ENOMEM);
c->as = mem;
++c->nb_as;
*as = &c->as[c->nb_as - 1];
memset(*as, 0, sizeof(**as));
(*as)->media_type = type;
(*as)->frag_type = -1;
(*as)->trick_idx = -1;
return 0;
}
static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
{
DASHContext *c = s->priv_data;
AdaptationSet *as = &c->as[as_idx - 1];
OutputStream *os = &c->streams[i];
if (as->media_type != s->streams[i]->codecpar->codec_type) {
av_log(s, AV_LOG_ERROR, "Codec type of stream %d doesn't match AdaptationSet's media type\n", i);
return AVERROR(EINVAL);
} else if (os->as_idx) {
av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
return AVERROR(EINVAL);
}
if (c->profile & MPD_PROFILE_DVB && (as->nb_streams + 1) > 16) {
av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Representations per Adaptation Set\n");
return AVERROR(EINVAL);
}
os->as_idx = as_idx;
++as->nb_streams;
return 0;
}
static int parse_adaptation_sets(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
const char *p = c->adaptation_sets;
enum { new_set, parse_default, parsing_streams, parse_seg_duration, parse_frag_duration } state;
AdaptationSet *as;
int i, n, ret;
// default: one AdaptationSet for each stream
if (!p) {
for (i = 0; i < s->nb_streams; i++) {
if ((ret = add_adaptation_set(s, &as, s->streams[i]->codecpar->codec_type)) < 0)
return ret;
as->id = i;
c->streams[i].as_idx = c->nb_as;
++as->nb_streams;
}
goto end;
}
// syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
// option id=0,descriptor=descriptor_str,streams=0,1,2 and so on
// option id=0,seg_duration=2.5,frag_duration=0.5,streams=0,1,2
// id=1,trick_id=0,seg_duration=10,frag_type=none,streams=3 and so on
// descriptor is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015
// descriptor_str should be a self-closing xml tag.
// seg_duration and frag_duration have the same syntax as the global options of
// the same name, and the former have precedence over them if set.
state = new_set;
while (*p) {
if (*p == ' ') {
p++;
continue;
} else if (state == new_set && av_strstart(p, "id=", &p)) {
char id_str[10], *end_str;
n = strcspn(p, ",");
snprintf(id_str, sizeof(id_str), "%.*s", n, p);
i = strtol(id_str, &end_str, 10);
if (id_str == end_str || i < 0 || i > c->nb_as) {
av_log(s, AV_LOG_ERROR, "\"%s\" is not a valid value for an AdaptationSet id\n", id_str);
return AVERROR(EINVAL);
}
if ((ret = add_adaptation_set(s, &as, AVMEDIA_TYPE_UNKNOWN)) < 0)
return ret;
as->id = i;
p += n;
if (*p)
p++;
state = parse_default;
} else if (state != new_set && av_strstart(p, "seg_duration=", &p)) {
state = parse_seg_duration;
} else if (state != new_set && av_strstart(p, "frag_duration=", &p)) {
state = parse_frag_duration;
} else if (state == parse_seg_duration || state == parse_frag_duration) {
char str[32];
int64_t usecs = 0;
n = strcspn(p, ",");
snprintf(str, sizeof(str), "%.*s", n, p);
p += n;
if (*p)
p++;
ret = av_parse_time(&usecs, str, 1);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Unable to parse option value \"%s\" as duration\n", str);
return ret;
}
if (state == parse_seg_duration)
as->seg_duration = usecs;
else
as->frag_duration = usecs;
state = parse_default;
} else if (state != new_set && av_strstart(p, "frag_type=", &p)) {
char type_str[16];
n = strcspn(p, ",");
snprintf(type_str, sizeof(type_str), "%.*s", n, p);
p += n;
if (*p)
p++;
if (!strcmp(type_str, "duration"))
as->frag_type = FRAG_TYPE_DURATION;
else if (!strcmp(type_str, "pframes"))
as->frag_type = FRAG_TYPE_PFRAMES;
else if (!strcmp(type_str, "every_frame"))
as->frag_type = FRAG_TYPE_EVERY_FRAME;
else if (!strcmp(type_str, "none"))
as->frag_type = FRAG_TYPE_NONE;
else {
av_log(s, AV_LOG_ERROR, "Unable to parse option value \"%s\" as fragment type\n", type_str);
return ret;
}
state = parse_default;
} else if (state != new_set && av_strstart(p, "descriptor=", &p)) {
n = strcspn(p, ">") + 1; //followed by one comma, so plus 1
if (n < strlen(p)) {
as->descriptor = av_strndup(p, n);
} else {
av_log(s, AV_LOG_ERROR, "Parse error, descriptor string should be a self-closing xml tag\n");
return AVERROR(EINVAL);
}
p += n;
if (*p)
p++;
state = parse_default;
} else if ((state != new_set) && av_strstart(p, "trick_id=", &p)) {
char trick_id_str[10], *end_str;
n = strcspn(p, ",");
snprintf(trick_id_str, sizeof(trick_id_str), "%.*s", n, p);
p += n;
as->trick_idx = strtol(trick_id_str, &end_str, 10);
if (trick_id_str == end_str || as->trick_idx < 0)
return AVERROR(EINVAL);
if (*p)
p++;
state = parse_default;
} else if ((state != new_set) && av_strstart(p, "streams=", &p)) { //descriptor and durations are optional
state = parsing_streams;
} else if (state == parsing_streams) {
AdaptationSet *as = &c->as[c->nb_as - 1];
char idx_str[8], *end_str;
n = strcspn(p, " ,");
snprintf(idx_str, sizeof(idx_str), "%.*s", n, p);
p += n;
// if value is "a" or "v", map all streams of that type
if (as->media_type == AVMEDIA_TYPE_UNKNOWN && (idx_str[0] == 'v' || idx_str[0] == 'a')) {
enum AVMediaType type = (idx_str[0] == 'v') ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
av_log(s, AV_LOG_DEBUG, "Map all streams of type %s\n", idx_str);
for (i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->codecpar->codec_type != type)
continue;
as->media_type = s->streams[i]->codecpar->codec_type;
if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
return ret;
}
} else { // select single stream
i = strtol(idx_str, &end_str, 10);
if (idx_str == end_str || i < 0 || i >= s->nb_streams) {
av_log(s, AV_LOG_ERROR, "Selected stream \"%s\" not found!\n", idx_str);
return AVERROR(EINVAL);
}
av_log(s, AV_LOG_DEBUG, "Map stream %d\n", i);
if (as->media_type == AVMEDIA_TYPE_UNKNOWN) {
as->media_type = s->streams[i]->codecpar->codec_type;
}
if ((ret = adaptation_set_add_stream(s, c->nb_as, i)) < 0)
return ret;
}
if (*p == ' ')
state = new_set;
if (*p)
p++;
} else {
return AVERROR(EINVAL);
}
}
end:
// check for unassigned streams
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
if (!os->as_idx) {
av_log(s, AV_LOG_ERROR, "Stream %d is not mapped to an AdaptationSet\n", i);
return AVERROR(EINVAL);
}
}
// check references for trick mode AdaptationSet
for (i = 0; i < c->nb_as; i++) {
as = &c->as[i];
if (as->trick_idx < 0)
continue;
for (n = 0; n < c->nb_as; n++) {
if (c->as[n].id == as->trick_idx)
break;
}
if (n >= c->nb_as) {
av_log(s, AV_LOG_ERROR, "reference AdaptationSet id \"%d\" not found for trick mode AdaptationSet id \"%d\"\n", as->trick_idx, as->id);
return AVERROR(EINVAL);
}
}
return 0;
}
static int write_manifest(AVFormatContext *s, int final)
{
DASHContext *c = s->priv_data;
AVIOContext *out;
char temp_filename[1024];
int ret, i;
const char *proto = avio_find_protocol_name(s->url);
int use_rename = proto && !strcmp(proto, "file");
static unsigned int warned_non_file = 0;
AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
AVDictionary *opts = NULL;
if (!use_rename && !warned_non_file++)
av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->url);
set_http_options(&opts, c);
ret = dashenc_io_open(s, &c->mpd_out, temp_filename, &opts);
av_dict_free(&opts);
if (ret < 0) {
return handle_io_open_error(s, ret, temp_filename);
}
out = c->mpd_out;
avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
"\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
"\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
"\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
"\tprofiles=\"");
if (c->profile & MPD_PROFILE_DASH)
avio_printf(out, "%s%s", "urn:mpeg:dash:profile:isoff-live:2011", c->profile & MPD_PROFILE_DVB ? "," : "\"\n");
if (c->profile & MPD_PROFILE_DVB)
avio_printf(out, "%s", "urn:dvb:dash:profile:dvb-dash:2014\"\n");
avio_printf(out, "\ttype=\"%s\"\n",
final ? "static" : "dynamic");
if (final) {
avio_printf(out, "\tmediaPresentationDuration=\"");
write_time(out, c->total_duration);
avio_printf(out, "\"\n");
} else {
int64_t update_period = c->last_duration / AV_TIME_BASE;
char now_str[100];
if (c->use_template && !c->use_timeline)
update_period = 500;
if (c->update_period)
update_period = c->update_period;
avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
if (!c->ldash)
avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
if (c->availability_start_time[0])
avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
format_date(now_str, sizeof(now_str), av_gettime());
if (now_str[0])
avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
if (c->window_size && c->use_template) {
avio_printf(out, "\ttimeShiftBufferDepth=\"");
write_time(out, c->last_duration * c->window_size);
avio_printf(out, "\"\n");
}
}
avio_printf(out, "\tmaxSegmentDuration=\"");
write_time(out, c->max_segment_duration);
avio_printf(out, "\"\n");
avio_printf(out, "\tminBufferTime=\"");
write_time(out, c->ldash && c->max_gop_size ? c->max_gop_size : c->last_duration * 2);
avio_printf(out, "\">\n");
avio_printf(out, "\t<ProgramInformation>\n");
if (title) {
char *escaped = xmlescape(title->value);
avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
av_free(escaped);
}
avio_printf(out, "\t</ProgramInformation>\n");
avio_printf(out, "\t<ServiceDescription id=\"0\">\n");
if (!final && c->target_latency && c->target_latency_refid >= 0) {
avio_printf(out, "\t\t<Latency target=\"%"PRId64"\"", c->target_latency / 1000);
if (s->nb_streams > 1)
avio_printf(out, " referenceId=\"%d\"", c->target_latency_refid);
avio_printf(out, "/>\n");
}
if (av_cmp_q(c->min_playback_rate, (AVRational) {1, 1}) ||
av_cmp_q(c->max_playback_rate, (AVRational) {1, 1}))
avio_printf(out, "\t\t<PlaybackRate min=\"%.2f\" max=\"%.2f\"/>\n",
av_q2d(c->min_playback_rate), av_q2d(c->max_playback_rate));
avio_printf(out, "\t</ServiceDescription>\n");
if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
OutputStream *os = &c->streams[0];
int start_index = FFMAX(os->nb_segments - c->window_size, 0);
int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
avio_printf(out, "\t<Period id=\"0\" start=\"");
write_time(out, start_time);
avio_printf(out, "\">\n");
} else {
avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
}
for (i = 0; i < c->nb_as; i++) {
if ((ret = write_adaptation_set(s, out, i, final)) < 0)
return ret;
}
avio_printf(out, "\t</Period>\n");
if (c->utc_timing_url)
avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
avio_printf(out, "</MPD>\n");
avio_flush(out);
dashenc_io_close(s, &c->mpd_out, temp_filename);
if (use_rename) {
if ((ret = ff_rename(temp_filename, s->url, s)) < 0)
return ret;
}
if (c->hls_playlist) {
char filename_hls[1024];
// Publish master playlist only the configured rate
if (c->master_playlist_created && (!c->master_publish_rate ||
c->streams[0].segment_index % c->master_publish_rate))
return 0;
if (*c->dirname)
snprintf(filename_hls, sizeof(filename_hls), "%s%s", c->dirname, c->hls_master_name);
else
snprintf(filename_hls, sizeof(filename_hls), "%s", c->hls_master_name);
snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", filename_hls);
set_http_options(&opts, c);
ret = dashenc_io_open(s, &c->m3u8_out, temp_filename, &opts);
av_dict_free(&opts);
if (ret < 0) {
return handle_io_open_error(s, ret, temp_filename);
}
ff_hls_write_playlist_version(c->m3u8_out, 7);
if (c->has_video) {
// treat audio streams as alternative renditions for video streams
const char *audio_group = "A1";
char audio_codec_str[128] = "\0";
int is_default = 1;
int max_audio_bitrate = 0;
for (i = 0; i < s->nb_streams; i++) {
char playlist_file[64];
AVStream *st = s->streams[i];
OutputStream *os = &c->streams[i];
if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
continue;
if (os->segment_type != SEGMENT_TYPE_MP4)
continue;
get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
ff_hls_write_audio_rendition(c->m3u8_out, (char *)audio_group,
playlist_file, NULL, i, is_default);
max_audio_bitrate = FFMAX(st->codecpar->bit_rate +
os->muxer_overhead, max_audio_bitrate);
if (!av_strnstr(audio_codec_str, os->codec_str, sizeof(audio_codec_str))) {
if (strlen(audio_codec_str))
av_strlcat(audio_codec_str, ",", sizeof(audio_codec_str));
av_strlcat(audio_codec_str, os->codec_str, sizeof(audio_codec_str));
}
is_default = 0;
}
for (i = 0; i < s->nb_streams; i++) {
char playlist_file[64];
char codec_str[128];
AVStream *st = s->streams[i];
OutputStream *os = &c->streams[i];
char *agroup = NULL;
int stream_bitrate = os->muxer_overhead;
if (os->bit_rate > 0)
stream_bitrate += os->bit_rate;
else if (final)
stream_bitrate += os->pos * 8 * AV_TIME_BASE / c->total_duration;
else if (os->first_segment_bit_rate > 0)
stream_bitrate += os->first_segment_bit_rate;
if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
continue;
if (os->segment_type != SEGMENT_TYPE_MP4)
continue;
av_strlcpy(codec_str, os->codec_str, sizeof(codec_str));
if (max_audio_bitrate) {
agroup = (char *)audio_group;
stream_bitrate += max_audio_bitrate;
av_strlcat(codec_str, ",", sizeof(codec_str));
av_strlcat(codec_str, audio_codec_str, sizeof(codec_str));
}
get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
playlist_file, agroup,
codec_str, NULL, NULL);
}
} else {
// treat audio streams as separate renditions
for (i = 0; i < s->nb_streams; i++) {
char playlist_file[64];
char codec_str[128];
AVStream *st = s->streams[i];
OutputStream *os = &c->streams[i];
int stream_bitrate = os->muxer_overhead;
if (os->bit_rate > 0)
stream_bitrate += os->bit_rate;
else if (final)
stream_bitrate += os->pos * 8 * AV_TIME_BASE / c->total_duration;
else if (os->first_segment_bit_rate > 0)
stream_bitrate += os->first_segment_bit_rate;
if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
continue;
if (os->segment_type != SEGMENT_TYPE_MP4)
continue;
av_strlcpy(codec_str, os->codec_str, sizeof(codec_str));
get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
playlist_file, NULL,
codec_str, NULL, NULL);
}
}
dashenc_io_close(s, &c->m3u8_out, temp_filename);
if (use_rename)
if ((ret = ff_rename(temp_filename, filename_hls, s)) < 0)
return ret;
c->master_playlist_created = 1;
}
return 0;
}
static int dict_copy_entry(AVDictionary **dst, const AVDictionary *src, const char *key)
{
AVDictionaryEntry *entry = av_dict_get(src, key, NULL, 0);
if (entry)
av_dict_set(dst, key, entry->value, AV_DICT_DONT_OVERWRITE);
return 0;
}
static int dash_init(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
int ret = 0, i;
char *ptr;
char basename[1024];
c->nr_of_streams_to_flush = 0;
if (c->single_file_name)
c->single_file = 1;
if (c->single_file)
c->use_template = 0;
if (!c->profile) {
av_log(s, AV_LOG_ERROR, "At least one profile must be enabled.\n");
return AVERROR(EINVAL);
}
if (c->lhls && s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
av_log(s, AV_LOG_ERROR,
"LHLS is experimental, Please set -strict experimental in order to enable it.\n");
return AVERROR_EXPERIMENTAL;
}
if (c->lhls && !c->streaming) {
av_log(s, AV_LOG_WARNING, "Enabling streaming as LHLS is enabled\n");
c->streaming = 1;
}
if (c->lhls && !c->hls_playlist) {
av_log(s, AV_LOG_INFO, "Enabling hls_playlist as LHLS is enabled\n");
c->hls_playlist = 1;
}
if (c->ldash && !c->streaming) {
av_log(s, AV_LOG_WARNING, "Enabling streaming as LDash is enabled\n");
c->streaming = 1;
}
if (c->target_latency && !c->streaming) {
av_log(s, AV_LOG_WARNING, "Target latency option will be ignored as streaming is not enabled\n");
c->target_latency = 0;
}
if (c->global_sidx && !c->single_file) {
av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as single_file is not enabled\n");
c->global_sidx = 0;
}
if (c->global_sidx && c->streaming) {
av_log(s, AV_LOG_WARNING, "Global SIDX option will be ignored as streaming is enabled\n");
c->global_sidx = 0;
}
if (c->frag_type == FRAG_TYPE_NONE && c->streaming) {
av_log(s, AV_LOG_VERBOSE, "Changing frag_type from none to every_frame as streaming is enabled\n");
c->frag_type = FRAG_TYPE_EVERY_FRAME;
}
if (c->write_prft < 0) {
c->write_prft = c->ldash;
if (c->ldash)
av_log(s, AV_LOG_VERBOSE, "Enabling Producer Reference Time element for Low Latency mode\n");
}
if (c->write_prft && !c->utc_timing_url) {
av_log(s, AV_LOG_WARNING, "Producer Reference Time element option will be ignored as utc_timing_url is not set\n");
c->write_prft = 0;
}
if (c->write_prft && !c->streaming) {
av_log(s, AV_LOG_WARNING, "Producer Reference Time element option will be ignored as streaming is not enabled\n");
c->write_prft = 0;
}
if (c->ldash && !c->write_prft) {
av_log(s, AV_LOG_WARNING, "Low Latency mode enabled without Producer Reference Time element option! Resulting manifest may not be complaint\n");
}
if (c->target_latency && !c->write_prft) {
av_log(s, AV_LOG_WARNING, "Target latency option will be ignored as Producer Reference Time element will not be written\n");
c->target_latency = 0;
}
if (av_cmp_q(c->max_playback_rate, c->min_playback_rate) < 0) {
av_log(s, AV_LOG_WARNING, "Minimum playback rate value is higer than the Maximum. Both will be ignored\n");
c->min_playback_rate = c->max_playback_rate = (AVRational) {1, 1};
}
av_strlcpy(c->dirname, s->url, sizeof(c->dirname));
ptr = strrchr(c->dirname, '/');
if (ptr) {
av_strlcpy(basename, &ptr[1], sizeof(basename));
ptr[1] = '\0';
} else {
c->dirname[0] = '\0';
av_strlcpy(basename, s->url, sizeof(basename));
}
ptr = strrchr(basename, '.');
if (ptr)
*ptr = '\0';
c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
if (!c->streams)
return AVERROR(ENOMEM);
if ((ret = parse_adaptation_sets(s)) < 0)
return ret;
if ((ret = init_segment_types(s)) < 0)
return ret;
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
AdaptationSet *as = &c->as[os->as_idx - 1];
AVFormatContext *ctx;
AVStream *st;
AVDictionary *opts = NULL;
char filename[1024];
os->bit_rate = s->streams[i]->codecpar->bit_rate;
if (!os->bit_rate) {
int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
AV_LOG_ERROR : AV_LOG_WARNING;
av_log(s, level, "No bit rate set for stream %d\n", i);
if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)
return AVERROR(EINVAL);
}
// copy AdaptationSet language and role from stream metadata
dict_copy_entry(&as->metadata, s->streams[i]->metadata, "language");
dict_copy_entry(&as->metadata, s->streams[i]->metadata, "role");
if (c->init_seg_name) {
os->init_seg_name = av_strireplace(c->init_seg_name, "$ext$", os->extension_name);
if (!os->init_seg_name)
return AVERROR(ENOMEM);
}
if (c->media_seg_name) {
os->media_seg_name = av_strireplace(c->media_seg_name, "$ext$", os->extension_name);
if (!os->media_seg_name)
return AVERROR(ENOMEM);
}
if (c->single_file_name) {
os->single_file_name = av_strireplace(c->single_file_name, "$ext$", os->extension_name);
if (!os->single_file_name)
return AVERROR(ENOMEM);
}
if (os->segment_type == SEGMENT_TYPE_WEBM) {
if ((!c->single_file && !av_match_ext(os->init_seg_name, os->format_name)) ||
(!c->single_file && !av_match_ext(os->media_seg_name, os->format_name)) ||
( c->single_file && !av_match_ext(os->single_file_name, os->format_name))) {
av_log(s, AV_LOG_WARNING,
"One or many segment file names doesn't end with .webm. "
"Override -init_seg_name and/or -media_seg_name and/or "
"-single_file_name to end with the extension .webm\n");
}
if (c->streaming) {
// Streaming not supported as matroskaenc buffers internally before writing the output
av_log(s, AV_LOG_WARNING, "One or more streams in WebM output format. Streaming option will be ignored\n");
c->streaming = 0;
}
}
os->ctx = ctx = avformat_alloc_context();
if (!ctx)
return AVERROR(ENOMEM);
ctx->oformat = av_guess_format(os->format_name, NULL, NULL);
if (!ctx->oformat)
return AVERROR_MUXER_NOT_FOUND;
ctx->interrupt_callback = s->interrupt_callback;
ctx->opaque = s->opaque;
ctx->io_close = s->io_close;
ctx->io_close2 = s->io_close2;
ctx->io_open = s->io_open;
ctx->strict_std_compliance = s->strict_std_compliance;
if (!(st = avformat_new_stream(ctx, NULL)))
return AVERROR(ENOMEM);
avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
st->time_base = s->streams[i]->time_base;
st->avg_frame_rate = s->streams[i]->avg_frame_rate;
ctx->avoid_negative_ts = s->avoid_negative_ts;
ctx->flags = s->flags;
os->parser = av_parser_init(st->codecpar->codec_id);
if (os->parser) {
os->parser_avctx = avcodec_alloc_context3(NULL);
if (!os->parser_avctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(os->parser_avctx, st->codecpar);
if (ret < 0)
return ret;
// We only want to parse frame headers
os->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
}
if (c->single_file) {
if (os->single_file_name)
ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->single_file_name, i, 0, os->bit_rate, 0);
else
snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.%s", basename, i, os->format_name);
} else {
ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->init_seg_name, i, 0, os->bit_rate, 0);
}
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
set_http_options(&opts, c);
if (!c->single_file) {
if ((ret = avio_open_dyn_buf(&ctx->pb)) < 0)
return ret;
ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, &opts);
} else {
ctx->url = av_strdup(filename);
ret = avio_open2(&ctx->pb, filename, AVIO_FLAG_WRITE, NULL, &opts);
}
av_dict_free(&opts);
if (ret < 0)
return ret;
os->init_start_pos = 0;
av_dict_copy(&opts, c->format_options, 0);
if (!as->seg_duration)
as->seg_duration = c->seg_duration;
if (!as->frag_duration)
as->frag_duration = c->frag_duration;
if (as->frag_type < 0)
as->frag_type = c->frag_type;
os->seg_duration = as->seg_duration;
os->frag_duration = as->frag_duration;
os->frag_type = as->frag_type;
c->max_segment_duration = FFMAX(c->max_segment_duration, as->seg_duration);
if (c->profile & MPD_PROFILE_DVB && (os->seg_duration > 15000000 || os->seg_duration < 960000)) {
av_log(s, AV_LOG_ERROR, "Segment duration %"PRId64" is outside the allowed range for DVB-DASH profile\n", os->seg_duration);
return AVERROR(EINVAL);
}
if (os->frag_type == FRAG_TYPE_DURATION && !os->frag_duration) {
av_log(s, AV_LOG_WARNING, "frag_type set to duration for stream %d but no frag_duration set\n", i);
os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
}
if (os->frag_type == FRAG_TYPE_DURATION && os->frag_duration > os->seg_duration) {
av_log(s, AV_LOG_ERROR, "Fragment duration %"PRId64" is longer than Segment duration %"PRId64"\n", os->frag_duration, os->seg_duration);
return AVERROR(EINVAL);
}
if (os->frag_type == FRAG_TYPE_PFRAMES && (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO || !os->parser)) {
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && !os->parser)
av_log(s, AV_LOG_WARNING, "frag_type set to P-Frame reordering, but no parser found for stream %d\n", i);
os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
}
if (os->frag_type != FRAG_TYPE_PFRAMES && as->trick_idx < 0)
// Set this now if a parser isn't used
os->coding_dependency = 1;
if (os->segment_type == SEGMENT_TYPE_MP4) {
if (c->streaming)
// skip_sidx : Reduce bitrate overhead
// skip_trailer : Avoids growing memory usage with time
av_dict_set(&opts, "movflags", "+dash+delay_moov+skip_sidx+skip_trailer", AV_DICT_APPEND);
else {
if (c->global_sidx)
av_dict_set(&opts, "movflags", "+dash+delay_moov+global_sidx+skip_trailer", AV_DICT_APPEND);
else
av_dict_set(&opts, "movflags", "+dash+delay_moov+skip_trailer", AV_DICT_APPEND);
}
if (os->frag_type == FRAG_TYPE_EVERY_FRAME)
av_dict_set(&opts, "movflags", "+frag_every_frame", AV_DICT_APPEND);
else
av_dict_set(&opts, "movflags", "+frag_custom", AV_DICT_APPEND);
if (os->frag_type == FRAG_TYPE_DURATION)
av_dict_set_int(&opts, "frag_duration", os->frag_duration, 0);
if (c->write_prft)
av_dict_set(&opts, "write_prft", "wallclock", 0);
} else {
av_dict_set_int(&opts, "cluster_time_limit", c->seg_duration / 1000, 0);
av_dict_set_int(&opts, "cluster_size_limit", 5 * 1024 * 1024, 0); // set a large cluster size limit
av_dict_set_int(&opts, "dash", 1, 0);
av_dict_set_int(&opts, "dash_track_number", i + 1, 0);
av_dict_set_int(&opts, "live", 1, 0);
}
ret = avformat_init_output(ctx, &opts);
av_dict_free(&opts);
if (ret < 0)
return ret;
os->ctx_inited = 1;
avio_flush(ctx->pb);
av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);
s->streams[i]->time_base = st->time_base;
// If the muxer wants to shift timestamps, request to have them shifted
// already before being handed to this muxer, so we don't have mismatches
// between the MPD and the actual segments.
s->avoid_negative_ts = ctx->avoid_negative_ts;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
AVRational par;
if (avg_frame_rate.num > 0) {
if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
as->min_frame_rate = avg_frame_rate;
if (av_cmp_q(as->max_frame_rate, avg_frame_rate) < 0)
as->max_frame_rate = avg_frame_rate;
} else {
as->ambiguous_frame_rate = 1;
}
if (st->codecpar->width > as->max_width)
as->max_width = st->codecpar->width;
if (st->codecpar->height > as->max_height)
as->max_height = st->codecpar->height;
if (st->sample_aspect_ratio.num)
os->sar = st->sample_aspect_ratio;
else
os->sar = (AVRational){1,1};
av_reduce(&par.num, &par.den,
st->codecpar->width * (int64_t)os->sar.num,
st->codecpar->height * (int64_t)os->sar.den,
1024 * 1024);
if (as->par.num && av_cmp_q(par, as->par)) {
av_log(s, AV_LOG_ERROR, "Conflicting stream aspect ratios values in Adaptation Set %d. Please ensure all adaptation sets have the same aspect ratio\n", os->as_idx);
return AVERROR(EINVAL);
}
as->par = par;
c->has_video = 1;
}
set_codec_str(s, st->codecpar, &st->avg_frame_rate, os->codec_str,
sizeof(os->codec_str));
os->first_pts = AV_NOPTS_VALUE;
os->max_pts = AV_NOPTS_VALUE;
os->last_dts = AV_NOPTS_VALUE;
os->segment_index = 1;
if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
c->nr_of_streams_to_flush++;
}
if (!c->has_video && c->seg_duration <= 0) {
av_log(s, AV_LOG_WARNING, "no video stream and no seg duration set\n");
return AVERROR(EINVAL);
}
if (!c->has_video && c->frag_type == FRAG_TYPE_PFRAMES)
av_log(s, AV_LOG_WARNING, "no video stream and P-frame fragmentation set\n");
c->nr_of_streams_flushed = 0;
c->target_latency_refid = -1;
return 0;
}
static int dash_write_header(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
int i, ret;
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
if ((ret = avformat_write_header(os->ctx, NULL)) < 0)
return ret;
// Flush init segment
// Only for WebM segment, since for mp4 delay_moov is set and
// the init segment is thus flushed after the first packets.
if (os->segment_type == SEGMENT_TYPE_WEBM &&
(ret = flush_init_segment(s, os)) < 0)
return ret;
}
return ret;
}
static int add_segment(OutputStream *os, const char *file,
int64_t time, int64_t duration,
int64_t start_pos, int64_t range_length,
int64_t index_length, int next_exp_index)
{
int err;
Segment *seg;
if (os->nb_segments >= os->segments_size) {
os->segments_size = (os->segments_size + 1) * 2;
if ((err = av_reallocp_array(&os->segments, sizeof(*os->segments),
os->segments_size)) < 0) {
os->segments_size = 0;
os->nb_segments = 0;
return err;
}
}
seg = av_mallocz(sizeof(*seg));
if (!seg)
return AVERROR(ENOMEM);
av_strlcpy(seg->file, file, sizeof(seg->file));
seg->time = time;
seg->duration = duration;
if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list
seg->duration += seg->time;
seg->time = 0;
}
seg->start_pos = start_pos;
seg->range_length = range_length;
seg->index_length = index_length;
os->segments[os->nb_segments++] = seg;
os->segment_index++;
//correcting the segment index if it has fallen behind the expected value
if (os->segment_index < next_exp_index) {
av_log(NULL, AV_LOG_WARNING, "Correcting the segment index after file %s: current=%d corrected=%d\n",
file, os->segment_index, next_exp_index);
os->segment_index = next_exp_index;
}
return 0;
}
static void write_styp(AVIOContext *pb)
{
avio_wb32(pb, 24);
ffio_wfourcc(pb, "styp");
ffio_wfourcc(pb, "msdh");
avio_wb32(pb, 0); /* minor */
ffio_wfourcc(pb, "msdh");
ffio_wfourcc(pb, "msix");
}
static void find_index_range(AVFormatContext *s, const char *full_path,
int64_t pos, int *index_length)
{
uint8_t buf[8];
AVIOContext *pb;
int ret;
ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);
if (ret < 0)
return;
if (avio_seek(pb, pos, SEEK_SET) != pos) {
ff_format_io_close(s, &pb);
return;
}
ret = avio_read(pb, buf, 8);
ff_format_io_close(s, &pb);
if (ret < 8)
return;
if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
return;
*index_length = AV_RB32(&buf[0]);
}
static int update_stream_extradata(AVFormatContext *s, OutputStream *os,
AVPacket *pkt, AVRational *frame_rate)
{
AVCodecParameters *par = os->ctx->streams[0]->codecpar;
uint8_t *extradata;
size_t extradata_size;
int ret;
if (par->extradata_size)
return 0;
extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &extradata_size);
if (!extradata_size)
return 0;
ret = ff_alloc_extradata(par, extradata_size);
if (ret < 0)
return ret;
memcpy(par->extradata, extradata, extradata_size);
set_codec_str(s, par, frame_rate, os->codec_str, sizeof(os->codec_str));
return 0;
}
static void dashenc_delete_file(AVFormatContext *s, char *filename) {
DASHContext *c = s->priv_data;
int http_base_proto = ff_is_http_proto(filename);
if (http_base_proto) {
AVIOContext *out = NULL;
AVDictionary *http_opts = NULL;
set_http_options(&http_opts, c);
av_dict_set(&http_opts, "method", "DELETE", 0);
if (dashenc_io_open(s, &out, filename, &http_opts) < 0) {
av_log(s, AV_LOG_ERROR, "failed to delete %s\n", filename);
}
av_dict_free(&http_opts);
ff_format_io_close(s, &out);
} else {
int res = ffurl_delete(filename);
if (res < 0) {
char errbuf[AV_ERROR_MAX_STRING_SIZE];
av_strerror(res, errbuf, sizeof(errbuf));
av_log(s, (res == AVERROR(ENOENT) ? AV_LOG_WARNING : AV_LOG_ERROR), "failed to delete %s: %s\n", filename, errbuf);
}
}
}
static int dashenc_delete_segment_file(AVFormatContext *s, const char* file)
{
DASHContext *c = s->priv_data;
AVBPrint buf;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprintf(&buf, "%s%s", c->dirname, file);
if (!av_bprint_is_complete(&buf)) {
av_bprint_finalize(&buf, NULL);
av_log(s, AV_LOG_WARNING, "Out of memory for filename\n");
return AVERROR(ENOMEM);
}
dashenc_delete_file(s, buf.str);
av_bprint_finalize(&buf, NULL);
return 0;
}
static inline void dashenc_delete_media_segments(AVFormatContext *s, OutputStream *os, int remove_count)
{
for (int i = 0; i < remove_count; ++i) {
dashenc_delete_segment_file(s, os->segments[i]->file);
// Delete the segment regardless of whether the file was successfully deleted
av_free(os->segments[i]);
}
os->nb_segments -= remove_count;
memmove(os->segments, os->segments + remove_count, os->nb_segments * sizeof(*os->segments));
}
static int dash_flush(AVFormatContext *s, int final, int stream)
{
DASHContext *c = s->priv_data;
int i, ret = 0;
const char *proto = avio_find_protocol_name(s->url);
int use_rename = proto && !strcmp(proto, "file");
int cur_flush_segment_index = 0, next_exp_index = -1;
if (stream >= 0) {
cur_flush_segment_index = c->streams[stream].segment_index;
//finding the next segment's expected index, based on the current pts value
if (c->use_template && !c->use_timeline && c->index_correction &&
c->streams[stream].last_pts != AV_NOPTS_VALUE &&
c->streams[stream].first_pts != AV_NOPTS_VALUE) {
int64_t pts_diff = av_rescale_q(c->streams[stream].last_pts -
c->streams[stream].first_pts,
s->streams[stream]->time_base,
AV_TIME_BASE_Q);
next_exp_index = (pts_diff / c->streams[stream].seg_duration) + 1;
}
}
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
AVStream *st = s->streams[i];
int range_length, index_length = 0;
int64_t duration;
if (!os->packets_written)
continue;
// Flush the single stream that got a keyframe right now.
// Flush all audio streams as well, in sync with video keyframes,
// but not the other video streams.
if (stream >= 0 && i != stream) {
if (s->streams[stream]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
continue;
if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
continue;
// Make sure we don't flush audio streams multiple times, when
// all video streams are flushed one at a time.
if (c->has_video && os->segment_index > cur_flush_segment_index)
continue;
}
if (c->single_file)
snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname, os->initfile);
ret = flush_dynbuf(c, os, &range_length);
if (ret < 0)
break;
os->packets_written = 0;
if (c->single_file) {
find_index_range(s, os->full_path, os->pos, &index_length);
} else {
dashenc_io_close(s, &os->out, os->temp_path);
if (use_rename) {
ret = ff_rename(os->temp_path, os->full_path, os->ctx);
if (ret < 0)
break;
}
}
duration = av_rescale_q(os->max_pts - os->start_pts, st->time_base, AV_TIME_BASE_Q);
os->last_duration = FFMAX(os->last_duration, duration);
if (!os->muxer_overhead && os->max_pts > os->start_pts)
os->muxer_overhead = ((int64_t) (range_length - os->total_pkt_size) *
8 * AV_TIME_BASE) / duration;
os->total_pkt_size = 0;
os->total_pkt_duration = 0;
if (!os->bit_rate && !os->first_segment_bit_rate) {
os->first_segment_bit_rate = (int64_t) range_length * 8 * AV_TIME_BASE / duration;
}
add_segment(os, os->filename, os->start_pts, os->max_pts - os->start_pts, os->pos, range_length, index_length, next_exp_index);
av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, os->full_path);
os->pos += range_length;
}
if (c->window_size) {
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
int remove_count = os->nb_segments - c->window_size - c->extra_window_size;
if (remove_count > 0)
dashenc_delete_media_segments(s, os, remove_count);
}
}
if (final) {
for (i = 0; i < s->nb_streams; i++) {
OutputStream *os = &c->streams[i];
if (os->ctx && os->ctx_inited) {
int64_t file_size = avio_tell(os->ctx->pb);
av_write_trailer(os->ctx);
if (c->global_sidx) {
int j, start_index, start_number;
int64_t sidx_size = avio_tell(os->ctx->pb) - file_size;
get_start_index_number(os, c, &start_index, &start_number);
if (start_index >= os->nb_segments ||
os->segment_type != SEGMENT_TYPE_MP4)
continue;
os->init_range_length += sidx_size;
for (j = start_index; j < os->nb_segments; j++) {
Segment *seg = os->segments[j];
seg->start_pos += sidx_size;
}
}
}
}
}
if (ret >= 0) {
if (c->has_video && !final) {
c->nr_of_streams_flushed++;
if (c->nr_of_streams_flushed != c->nr_of_streams_to_flush)
return ret;
c->nr_of_streams_flushed = 0;
}
// In streaming mode the manifest is written at the beginning
// of the segment instead
if (!c->streaming || final)
ret = write_manifest(s, final);
}
return ret;
}
static int dash_parse_prft(DASHContext *c, AVPacket *pkt)
{
OutputStream *os = &c->streams[pkt->stream_index];
AVProducerReferenceTime *prft;
size_t side_data_size;
prft = (AVProducerReferenceTime *)av_packet_get_side_data(pkt, AV_PKT_DATA_PRFT, &side_data_size);
if (!prft || side_data_size != sizeof(AVProducerReferenceTime) || (prft->flags && prft->flags != 24)) {
// No encoder generated or user provided capture time AVProducerReferenceTime side data. Instead
// of letting the mov muxer generate one, do it here so we can also use it for the manifest.
prft = (AVProducerReferenceTime *)av_packet_new_side_data(pkt, AV_PKT_DATA_PRFT,
sizeof(AVProducerReferenceTime));
if (!prft)
return AVERROR(ENOMEM);
prft->wallclock = av_gettime();
prft->flags = 24;
}
if (os->first_pts == AV_NOPTS_VALUE) {
os->producer_reference_time = *prft;
if (c->target_latency_refid < 0)
c->target_latency_refid = pkt->stream_index;
}
return 0;
}
static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
{
DASHContext *c = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
OutputStream *os = &c->streams[pkt->stream_index];
AdaptationSet *as = &c->as[os->as_idx - 1];
int64_t seg_end_duration, elapsed_duration;
int ret;
ret = update_stream_extradata(s, os, pkt, &st->avg_frame_rate);
if (ret < 0)
return ret;
// Fill in a heuristic guess of the packet duration, if none is available.
// The mp4 muxer will do something similar (for the last packet in a fragment)
// if nothing is set (setting it for the other packets doesn't hurt).
// By setting a nonzero duration here, we can be sure that the mp4 muxer won't
// invoke its heuristic (this doesn't have to be identical to that algorithm),
// so that we know the exact timestamps of fragments.
if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)
pkt->duration = pkt->dts - os->last_dts;
os->last_dts = pkt->dts;
// If forcing the stream to start at 0, the mp4 muxer will set the start
// timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
if (os->first_pts == AV_NOPTS_VALUE &&
s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
pkt->pts -= pkt->dts;
pkt->dts = 0;
}
if (c->write_prft) {
ret = dash_parse_prft(c, pkt);
if (ret < 0)
return ret;
}
if (os->first_pts == AV_NOPTS_VALUE) {
os->first_pts = pkt->pts;
}
os->last_pts = pkt->pts;
if (!c->availability_start_time[0]) {
int64_t start_time_us = av_gettime();
c->start_time_s = start_time_us / 1000000;
format_date(c->availability_start_time,
sizeof(c->availability_start_time), start_time_us);
}
if (!os->packets_written)
os->availability_time_offset = 0;
if (!os->availability_time_offset &&
((os->frag_type == FRAG_TYPE_DURATION && os->seg_duration != os->frag_duration) ||
(os->frag_type == FRAG_TYPE_EVERY_FRAME && pkt->duration))) {
AdaptationSet *as = &c->as[os->as_idx - 1];
int64_t frame_duration = 0;
switch (os->frag_type) {
case FRAG_TYPE_DURATION:
frame_duration = os->frag_duration;
break;
case FRAG_TYPE_EVERY_FRAME:
frame_duration = av_rescale_q(pkt->duration, st->time_base, AV_TIME_BASE_Q);
break;
}
os->availability_time_offset = ((double) os->seg_duration -
frame_duration) / AV_TIME_BASE;
as->max_frag_duration = FFMAX(frame_duration, as->max_frag_duration);
}
if (c->use_template && !c->use_timeline) {
elapsed_duration = pkt->pts - os->first_pts;
seg_end_duration = (int64_t) os->segment_index * os->seg_duration;
} else {
elapsed_duration = pkt->pts - os->start_pts;
seg_end_duration = os->seg_duration;
}
if (os->parser &&
(os->frag_type == FRAG_TYPE_PFRAMES ||
as->trick_idx >= 0)) {
// Parse the packets only in scenarios where it's needed
uint8_t *data;
int size;
av_parser_parse2(os->parser, os->parser_avctx,
&data, &size, pkt->data, pkt->size,
pkt->pts, pkt->dts, pkt->pos);
os->coding_dependency |= os->parser->pict_type != AV_PICTURE_TYPE_I;
}
if (pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
av_compare_ts(elapsed_duration, st->time_base,
seg_end_duration, AV_TIME_BASE_Q) >= 0) {
if (!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
c->last_duration = av_rescale_q(pkt->pts - os->start_pts,
st->time_base,
AV_TIME_BASE_Q);
c->total_duration = av_rescale_q(pkt->pts - os->first_pts,
st->time_base,
AV_TIME_BASE_Q);
if ((!c->use_timeline || !c->use_template) && os->last_duration) {
if (c->last_duration < os->last_duration*9/10 ||
c->last_duration > os->last_duration*11/10) {
av_log(s, AV_LOG_WARNING,
"Segment durations differ too much, enable use_timeline "
"and use_template, or keep a stricter keyframe interval\n");
}
}
}
if (c->write_prft && os->producer_reference_time.wallclock && !os->producer_reference_time_str[0])
format_date(os->producer_reference_time_str,
sizeof(os->producer_reference_time_str),
os->producer_reference_time.wallclock);
if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
return ret;
}
if (!os->packets_written) {
// If we wrote a previous segment, adjust the start time of the segment
// to the end of the previous one (which is the same as the mp4 muxer
// does). This avoids gaps in the timeline.
if (os->max_pts != AV_NOPTS_VALUE)
os->start_pts = os->max_pts;
else
os->start_pts = pkt->pts;
}
if (os->max_pts == AV_NOPTS_VALUE)
os->max_pts = pkt->pts + pkt->duration;
else
os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
os->frag_type == FRAG_TYPE_PFRAMES &&
os->packets_written) {
av_assert0(os->parser);
if ((os->parser->pict_type == AV_PICTURE_TYPE_P &&
st->codecpar->video_delay &&
!(os->last_flags & AV_PKT_FLAG_KEY)) ||
pkt->flags & AV_PKT_FLAG_KEY) {
ret = av_write_frame(os->ctx, NULL);
if (ret < 0)
return ret;
if (!os->availability_time_offset) {
int64_t frag_duration = av_rescale_q(os->total_pkt_duration, st->time_base,
AV_TIME_BASE_Q);
os->availability_time_offset = ((double) os->seg_duration -
frag_duration) / AV_TIME_BASE;
as->max_frag_duration = FFMAX(frag_duration, as->max_frag_duration);
}
}
}
if (pkt->flags & AV_PKT_FLAG_KEY && (os->packets_written || os->nb_segments) && !os->gop_size && as->trick_idx < 0) {
os->gop_size = os->last_duration + av_rescale_q(os->total_pkt_duration, st->time_base, AV_TIME_BASE_Q);
c->max_gop_size = FFMAX(c->max_gop_size, os->gop_size);
}
if ((ret = ff_write_chained(os->ctx, 0, pkt, s, 0)) < 0)
return ret;
os->packets_written++;
os->total_pkt_size += pkt->size;
os->total_pkt_duration += pkt->duration;
os->last_flags = pkt->flags;
if (!os->init_range_length)
flush_init_segment(s, os);
//open the output context when the first frame of a segment is ready
if (!c->single_file && os->packets_written == 1) {
AVDictionary *opts = NULL;
const char *proto = avio_find_protocol_name(s->url);
int use_rename = proto && !strcmp(proto, "file");
if (os->segment_type == SEGMENT_TYPE_MP4)
write_styp(os->ctx->pb);
os->filename[0] = os->full_path[0] = os->temp_path[0] = '\0';
ff_dash_fill_tmpl_params(os->filename, sizeof(os->filename),
os->media_seg_name, pkt->stream_index,
os->segment_index, os->bit_rate, os->start_pts);
snprintf(os->full_path, sizeof(os->full_path), "%s%s", c->dirname,
os->filename);
snprintf(os->temp_path, sizeof(os->temp_path),
use_rename ? "%s.tmp" : "%s", os->full_path);
set_http_options(&opts, c);
ret = dashenc_io_open(s, &os->out, os->temp_path, &opts);
av_dict_free(&opts);
if (ret < 0) {
return handle_io_open_error(s, ret, os->temp_path);
}
// in streaming mode, the segments are available for playing
// before fully written but the manifest is needed so that
// clients and discover the segment filenames.
if (c->streaming) {
write_manifest(s, 0);
}
if (c->lhls) {
char *prefetch_url = use_rename ? NULL : os->filename;
write_hls_media_playlist(os, s, pkt->stream_index, 0, prefetch_url);
}
}
//write out the data immediately in streaming mode
if (c->streaming && os->segment_type == SEGMENT_TYPE_MP4) {
int len = 0;
uint8_t *buf = NULL;
avio_flush(os->ctx->pb);
len = avio_get_dyn_buf (os->ctx->pb, &buf);
if (os->out) {
avio_write(os->out, buf + os->written_len, len - os->written_len);
avio_flush(os->out);
}
os->written_len = len;
}
return ret;
}
static int dash_write_trailer(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
int i;
if (s->nb_streams > 0) {
OutputStream *os = &c->streams[0];
// If no segments have been written so far, try to do a crude
// guess of the segment duration
if (!c->last_duration)
c->last_duration = av_rescale_q(os->max_pts - os->start_pts,
s->streams[0]->time_base,
AV_TIME_BASE_Q);
c->total_duration = av_rescale_q(os->max_pts - os->first_pts,
s->streams[0]->time_base,
AV_TIME_BASE_Q);
}
dash_flush(s, 1, -1);
if (c->remove_at_exit) {
for (i = 0; i < s->nb_streams; ++i) {
OutputStream *os = &c->streams[i];
dashenc_delete_media_segments(s, os, os->nb_segments);
dashenc_delete_segment_file(s, os->initfile);
if (c->hls_playlist && os->segment_type == SEGMENT_TYPE_MP4) {
char filename[1024];
get_hls_playlist_name(filename, sizeof(filename), c->dirname, i);
dashenc_delete_file(s, filename);
}
}
dashenc_delete_file(s, s->url);
if (c->hls_playlist && c->master_playlist_created) {
char filename[1024];
snprintf(filename, sizeof(filename), "%s%s", c->dirname, c->hls_master_name);
dashenc_delete_file(s, filename);
}
}
return 0;
}
static int dash_check_bitstream(AVFormatContext *s, AVStream *st,
const AVPacket *avpkt)
{
DASHContext *c = s->priv_data;
OutputStream *os = &c->streams[st->index];
AVFormatContext *oc = os->ctx;
if (oc->oformat->check_bitstream) {
AVStream *const ost = oc->streams[0];
int ret;
ret = oc->oformat->check_bitstream(oc, ost, avpkt);
if (ret == 1) {
FFStream *const sti = ffstream(st);
FFStream *const osti = ffstream(ost);
sti->bsfc = osti->bsfc;
osti->bsfc = NULL;
}
return ret;
}
return 1;
}
#define OFFSET(x) offsetof(DASHContext, x)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
{ "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
{ "seg_duration", "segment duration (in seconds, fractional value can be set)", OFFSET(seg_duration), AV_OPT_TYPE_DURATION, { .i64 = 5000000 }, 0, INT_MAX, E },
{ "frag_duration", "fragment duration (in seconds, fractional value can be set)", OFFSET(frag_duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT_MAX, E },
{ "frag_type", "set type of interval for fragments", OFFSET(frag_type), AV_OPT_TYPE_INT, {.i64 = FRAG_TYPE_NONE }, 0, FRAG_TYPE_NB - 1, E, "frag_type"},
{ "none", "one fragment per segment", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_NONE }, 0, UINT_MAX, E, "frag_type"},
{ "every_frame", "fragment at every frame", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_EVERY_FRAME }, 0, UINT_MAX, E, "frag_type"},
{ "duration", "fragment at specific time intervals", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_DURATION }, 0, UINT_MAX, E, "frag_type"},
{ "pframes", "fragment at keyframes and following P-Frame reordering (Video only, experimental)", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_PFRAMES }, 0, UINT_MAX, E, "frag_type"},
{ "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
{ "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
{ "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
{ "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.$ext$"}, 0, 0, E },
{ "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.$ext$"}, 0, 0, E },
{ "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },
{ "method", "set the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
{ "http_persistent", "Use persistent HTTP connections", OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
{ "hls_playlist", "Generate HLS playlist files(master.m3u8, media_%d.m3u8)", OFFSET(hls_playlist), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "hls_master_name", "HLS master playlist name", OFFSET(hls_master_name), AV_OPT_TYPE_STRING, {.str = "master.m3u8"}, 0, 0, E },
{ "streaming", "Enable/Disable streaming mode of output. Each frame will be moof fragment", OFFSET(streaming), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "timeout", "set timeout for socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT_MAX, .flags = E },
{ "index_correction", "Enable/Disable segment index correction logic", OFFSET(index_correction), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "format_options","set list of options for the container format (mp4/webm) used for dash", OFFSET(format_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E},
{ "global_sidx", "Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode", OFFSET(global_sidx), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "dash_segment_type", "set dash segment files type", OFFSET(segment_type_option), AV_OPT_TYPE_INT, {.i64 = SEGMENT_TYPE_AUTO }, 0, SEGMENT_TYPE_NB - 1, E, "segment_type"},
{ "auto", "select segment file format based on codec", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_AUTO }, 0, UINT_MAX, E, "segment_type"},
{ "mp4", "make segment file in ISOBMFF format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_MP4 }, 0, UINT_MAX, E, "segment_type"},
{ "webm", "make segment file in WebM format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_WEBM }, 0, UINT_MAX, E, "segment_type"},
{ "ignore_io_errors", "Ignore IO errors during open and write. Useful for long-duration runs with network output", OFFSET(ignore_io_errors), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "lhls", "Enable Low-latency HLS(Experimental). Adds #EXT-X-PREFETCH tag with current segment's URI", OFFSET(lhls), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "ldash", "Enable Low-latency dash. Constrains the value of a few elements", OFFSET(ldash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "master_m3u8_publish_rate", "Publish master playlist every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
{ "write_prft", "Write producer reference time element", OFFSET(write_prft), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, E},
{ "mpd_profile", "Set profiles. Elements and values used in the manifest may be constrained by them", OFFSET(profile), AV_OPT_TYPE_FLAGS, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
{ "dash", "MPEG-DASH ISO Base media file format live profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
{ "dvb_dash", "DVB-DASH profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DVB }, 0, UINT_MAX, E, "mpd_profile"},
{ "http_opts", "HTTP protocol options", OFFSET(http_opts), AV_OPT_TYPE_DICT, { .str = NULL }, 0, 0, E },
{ "target_latency", "Set desired target latency for Low-latency dash", OFFSET(target_latency), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT_MAX, E },
{ "min_playback_rate", "Set desired minimum playback rate", OFFSET(min_playback_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 1.0 }, 0.5, 1.5, E },
{ "max_playback_rate", "Set desired maximum playback rate", OFFSET(max_playback_rate), AV_OPT_TYPE_RATIONAL, { .dbl = 1.0 }, 0.5, 1.5, E },
{ "update_period", "Set the mpd update interval", OFFSET(update_period), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
{ NULL },
};
static const AVClass dash_class = {
.class_name = "dash muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVOutputFormat ff_dash_muxer = {
.name = "dash",
.long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
.extensions = "mpd",
.priv_data_size = sizeof(DASHContext),
.audio_codec = AV_CODEC_ID_AAC,
.video_codec = AV_CODEC_ID_H264,
.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
.init = dash_init,
.write_header = dash_write_header,
.write_packet = dash_write_packet,
.write_trailer = dash_write_trailer,
.deinit = dash_free,
.check_bitstream = dash_check_bitstream,
.priv_class = &dash_class,
};
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