forked from KolibriOS/kolibrios
1014 lines
38 KiB
C
1014 lines
38 KiB
C
/*
|
|
* MPEG-DASH ISO BMFF segmenter
|
|
* Copyright (c) 2014 Martin Storsjo
|
|
*
|
|
* 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"
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/time_internal.h"
|
|
|
|
#include "avc.h"
|
|
#include "avformat.h"
|
|
#include "avio_internal.h"
|
|
#include "internal.h"
|
|
#include "isom.h"
|
|
#include "os_support.h"
|
|
#include "url.h"
|
|
|
|
// See ISO/IEC 23009-1:2014 5.3.9.4.4
|
|
typedef enum {
|
|
DASH_TMPL_ID_UNDEFINED = -1,
|
|
DASH_TMPL_ID_ESCAPE,
|
|
DASH_TMPL_ID_REP_ID,
|
|
DASH_TMPL_ID_NUMBER,
|
|
DASH_TMPL_ID_BANDWIDTH,
|
|
DASH_TMPL_ID_TIME,
|
|
} DASHTmplId;
|
|
|
|
typedef struct Segment {
|
|
char file[1024];
|
|
int64_t start_pos;
|
|
int range_length, index_length;
|
|
int64_t time;
|
|
int duration;
|
|
int n;
|
|
} Segment;
|
|
|
|
typedef struct OutputStream {
|
|
AVFormatContext *ctx;
|
|
int ctx_inited;
|
|
uint8_t iobuf[32768];
|
|
URLContext *out;
|
|
int packets_written;
|
|
char initfile[1024];
|
|
int64_t init_start_pos;
|
|
int init_range_length;
|
|
int nb_segments, segments_size, segment_index;
|
|
Segment **segments;
|
|
int64_t first_pts, start_pts, max_pts;
|
|
int64_t last_dts;
|
|
int bit_rate;
|
|
char bandwidth_str[64];
|
|
|
|
char codec_str[100];
|
|
} OutputStream;
|
|
|
|
typedef struct DASHContext {
|
|
const AVClass *class; /* Class for private options. */
|
|
int window_size;
|
|
int extra_window_size;
|
|
int min_seg_duration;
|
|
int remove_at_exit;
|
|
int use_template;
|
|
int use_timeline;
|
|
int single_file;
|
|
OutputStream *streams;
|
|
int has_video, has_audio;
|
|
int64_t last_duration;
|
|
int64_t total_duration;
|
|
char availability_start_time[100];
|
|
char dirname[1024];
|
|
const char *single_file_name;
|
|
const char *init_seg_name;
|
|
const char *media_seg_name;
|
|
} DASHContext;
|
|
|
|
static int dash_write(void *opaque, uint8_t *buf, int buf_size)
|
|
{
|
|
OutputStream *os = opaque;
|
|
if (os->out)
|
|
ffurl_write(os->out, buf, buf_size);
|
|
return buf_size;
|
|
}
|
|
|
|
// RFC 6381
|
|
static void set_codec_str(AVFormatContext *s, AVCodecContext *codec,
|
|
char *str, int size)
|
|
{
|
|
const AVCodecTag *tags[2] = { NULL, NULL };
|
|
uint32_t tag;
|
|
if (codec->codec_type == AVMEDIA_TYPE_VIDEO)
|
|
tags[0] = ff_codec_movvideo_tags;
|
|
else if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
|
|
tags[0] = ff_codec_movaudio_tags;
|
|
else
|
|
return;
|
|
|
|
tag = av_codec_get_tag(tags, codec->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, codec->codec_id);
|
|
if (oti)
|
|
av_strlcatf(str, size, ".%02x", oti);
|
|
else
|
|
return;
|
|
|
|
if (tag == MKTAG('m', 'p', '4', 'a')) {
|
|
if (codec->extradata_size >= 2) {
|
|
int aot = codec->extradata[0] >> 3;
|
|
if (aot == 31)
|
|
aot = ((AV_RB16(codec->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 = codec->extradata;
|
|
int extradata_size = codec->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);
|
|
}
|
|
}
|
|
|
|
static void dash_free(AVFormatContext *s)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
int i, j;
|
|
if (!c->streams)
|
|
return;
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
if (os->ctx && os->ctx_inited)
|
|
av_write_trailer(os->ctx);
|
|
if (os->ctx && os->ctx->pb)
|
|
av_free(os->ctx->pb);
|
|
ffurl_close(os->out);
|
|
os->out = NULL;
|
|
if (os->ctx)
|
|
avformat_free_context(os->ctx);
|
|
for (j = 0; j < os->nb_segments; j++)
|
|
av_free(os->segments[j]);
|
|
av_free(os->segments);
|
|
}
|
|
av_freep(&c->streams);
|
|
}
|
|
|
|
static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext *c)
|
|
{
|
|
int i, 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);
|
|
}
|
|
|
|
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"\" ", c->last_duration);
|
|
avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
|
|
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=\"%d\" ", 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, c->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, c->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");
|
|
}
|
|
}
|
|
|
|
static DASHTmplId dash_read_tmpl_id(const char *identifier, char *format_tag,
|
|
size_t format_tag_size, const char **ptr) {
|
|
const char *next_ptr;
|
|
DASHTmplId id_type = DASH_TMPL_ID_UNDEFINED;
|
|
|
|
if (av_strstart(identifier, "$$", &next_ptr)) {
|
|
id_type = DASH_TMPL_ID_ESCAPE;
|
|
*ptr = next_ptr;
|
|
} else if (av_strstart(identifier, "$RepresentationID$", &next_ptr)) {
|
|
id_type = DASH_TMPL_ID_REP_ID;
|
|
// default to basic format, as $RepresentationID$ identifiers
|
|
// are not allowed to have custom format-tags.
|
|
av_strlcpy(format_tag, "%d", format_tag_size);
|
|
*ptr = next_ptr;
|
|
} else { // the following identifiers may have an explicit format_tag
|
|
if (av_strstart(identifier, "$Number", &next_ptr))
|
|
id_type = DASH_TMPL_ID_NUMBER;
|
|
else if (av_strstart(identifier, "$Bandwidth", &next_ptr))
|
|
id_type = DASH_TMPL_ID_BANDWIDTH;
|
|
else if (av_strstart(identifier, "$Time", &next_ptr))
|
|
id_type = DASH_TMPL_ID_TIME;
|
|
else
|
|
id_type = DASH_TMPL_ID_UNDEFINED;
|
|
|
|
// next parse the dash format-tag and generate a c-string format tag
|
|
// (next_ptr now points at the first '%' at the beginning of the format-tag)
|
|
if (id_type != DASH_TMPL_ID_UNDEFINED) {
|
|
const char *number_format = (id_type == DASH_TMPL_ID_TIME) ? PRId64 : "d";
|
|
if (next_ptr[0] == '$') { // no dash format-tag
|
|
snprintf(format_tag, format_tag_size, "%%%s", number_format);
|
|
*ptr = &next_ptr[1];
|
|
} else {
|
|
const char *width_ptr;
|
|
// only tolerate single-digit width-field (i.e. up to 9-digit width)
|
|
if (av_strstart(next_ptr, "%0", &width_ptr) &&
|
|
av_isdigit(width_ptr[0]) &&
|
|
av_strstart(&width_ptr[1], "d$", &next_ptr)) {
|
|
// yes, we're using a format tag to build format_tag.
|
|
snprintf(format_tag, format_tag_size, "%s%c%s", "%0", width_ptr[0], number_format);
|
|
*ptr = next_ptr;
|
|
} else {
|
|
av_log(NULL, AV_LOG_WARNING, "Failed to parse format-tag beginning with %s. Expected either a "
|
|
"closing '$' character or a format-string like '%%0[width]d', "
|
|
"where width must be a single digit\n", next_ptr);
|
|
id_type = DASH_TMPL_ID_UNDEFINED;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return id_type;
|
|
}
|
|
|
|
static void dash_fill_tmpl_params(char *dst, size_t buffer_size,
|
|
const char *template, int rep_id,
|
|
int number, int bit_rate,
|
|
int64_t time) {
|
|
int dst_pos = 0;
|
|
const char *t_cur = template;
|
|
while (dst_pos < buffer_size - 1 && *t_cur) {
|
|
char format_tag[7]; // May be "%d", "%0Xd", or "%0Xlld" (for $Time$), where X is in [0-9]
|
|
int n = 0;
|
|
DASHTmplId id_type;
|
|
const char *t_next = strchr(t_cur, '$'); // copy over everything up to the first '$' character
|
|
if (t_next) {
|
|
int num_copy_bytes = FFMIN(t_next - t_cur, buffer_size - dst_pos - 1);
|
|
av_strlcpy(&dst[dst_pos], t_cur, num_copy_bytes + 1);
|
|
// advance
|
|
dst_pos += num_copy_bytes;
|
|
t_cur = t_next;
|
|
} else { // no more DASH identifiers to substitute - just copy the rest over and break
|
|
av_strlcpy(&dst[dst_pos], t_cur, buffer_size - dst_pos);
|
|
break;
|
|
}
|
|
|
|
if (dst_pos >= buffer_size - 1 || !*t_cur)
|
|
break;
|
|
|
|
// t_cur is now pointing to a '$' character
|
|
id_type = dash_read_tmpl_id(t_cur, format_tag, sizeof(format_tag), &t_next);
|
|
switch (id_type) {
|
|
case DASH_TMPL_ID_ESCAPE:
|
|
av_strlcpy(&dst[dst_pos], "$", 2);
|
|
n = 1;
|
|
break;
|
|
case DASH_TMPL_ID_REP_ID:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, rep_id);
|
|
break;
|
|
case DASH_TMPL_ID_NUMBER:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, number);
|
|
break;
|
|
case DASH_TMPL_ID_BANDWIDTH:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, bit_rate);
|
|
break;
|
|
case DASH_TMPL_ID_TIME:
|
|
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, time);
|
|
break;
|
|
case DASH_TMPL_ID_UNDEFINED:
|
|
// copy over one byte and advance
|
|
av_strlcpy(&dst[dst_pos], t_cur, 2);
|
|
n = 1;
|
|
t_next = &t_cur[1];
|
|
break;
|
|
}
|
|
// t_next points just past the processed identifier
|
|
// n is the number of bytes that were attempted to be written to dst
|
|
// (may have failed to write all because buffer_size).
|
|
|
|
// advance
|
|
dst_pos += FFMIN(n, buffer_size - dst_pos - 1);
|
|
t_cur = t_next;
|
|
}
|
|
}
|
|
|
|
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], "&", 5);
|
|
pos += 5;
|
|
} else if (*str == '<') {
|
|
memcpy(&out[pos], "<", 4);
|
|
pos += 4;
|
|
} else if (*str == '>') {
|
|
memcpy(&out[pos], ">", 4);
|
|
pos += 4;
|
|
} else if (*str == '\'') {
|
|
memcpy(&out[pos], "'", 6);
|
|
pos += 6;
|
|
} else if (*str == '\"') {
|
|
memcpy(&out[pos], """, 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_now(char *buf, int size)
|
|
{
|
|
time_t t = time(NULL);
|
|
struct tm *ptm, tmbuf;
|
|
ptm = gmtime_r(&t, &tmbuf);
|
|
if (ptm) {
|
|
if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S", ptm))
|
|
buf[0] = '\0';
|
|
}
|
|
}
|
|
|
|
static int write_manifest(AVFormatContext *s, int final)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
AVIOContext *out;
|
|
char temp_filename[1024];
|
|
int ret, i;
|
|
AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
|
|
|
|
snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
|
|
ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
|
|
if (ret < 0) {
|
|
av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
|
|
return ret;
|
|
}
|
|
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=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
|
|
"\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;
|
|
avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
|
|
avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
|
|
if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {
|
|
format_date_now(c->availability_start_time, sizeof(c->availability_start_time));
|
|
}
|
|
if (c->availability_start_time[0])
|
|
avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
|
|
format_date_now(now_str, sizeof(now_str));
|
|
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, "\tminBufferTime=\"");
|
|
write_time(out, c->last_duration);
|
|
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");
|
|
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 start=\"");
|
|
write_time(out, start_time);
|
|
avio_printf(out, "\">\n");
|
|
} else {
|
|
avio_printf(out, "\t<Period start=\"PT0.0S\">\n");
|
|
}
|
|
|
|
if (c->has_video) {
|
|
avio_printf(out, "\t\t<AdaptationSet contentType=\"video\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n");
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
OutputStream *os = &c->streams[i];
|
|
|
|
if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
|
|
continue;
|
|
|
|
avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"%s\"%s width=\"%d\" height=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->width, st->codec->height);
|
|
output_segment_list(&c->streams[i], out, c);
|
|
avio_printf(out, "\t\t\t</Representation>\n");
|
|
}
|
|
avio_printf(out, "\t\t</AdaptationSet>\n");
|
|
}
|
|
if (c->has_audio) {
|
|
avio_printf(out, "\t\t<AdaptationSet contentType=\"audio\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n");
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
OutputStream *os = &c->streams[i];
|
|
|
|
if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
|
|
continue;
|
|
|
|
avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/mp4\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->sample_rate);
|
|
avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", st->codec->channels);
|
|
output_segment_list(&c->streams[i], out, c);
|
|
avio_printf(out, "\t\t\t</Representation>\n");
|
|
}
|
|
avio_printf(out, "\t\t</AdaptationSet>\n");
|
|
}
|
|
avio_printf(out, "\t</Period>\n");
|
|
avio_printf(out, "</MPD>\n");
|
|
avio_flush(out);
|
|
avio_close(out);
|
|
return ff_rename(temp_filename, s->filename, s);
|
|
}
|
|
|
|
static int dash_write_header(AVFormatContext *s)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
int ret = 0, i;
|
|
AVOutputFormat *oformat;
|
|
char *ptr;
|
|
char basename[1024];
|
|
|
|
if (c->single_file_name)
|
|
c->single_file = 1;
|
|
if (c->single_file)
|
|
c->use_template = 0;
|
|
|
|
av_strlcpy(c->dirname, s->filename, 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->filename, sizeof(basename));
|
|
}
|
|
|
|
ptr = strrchr(basename, '.');
|
|
if (ptr)
|
|
*ptr = '\0';
|
|
|
|
oformat = av_guess_format("mp4", NULL, NULL);
|
|
if (!oformat) {
|
|
ret = AVERROR_MUXER_NOT_FOUND;
|
|
goto fail;
|
|
}
|
|
|
|
c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
|
|
if (!c->streams) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
AVFormatContext *ctx;
|
|
AVStream *st;
|
|
AVDictionary *opts = NULL;
|
|
char filename[1024];
|
|
|
|
os->bit_rate = s->streams[i]->codec->bit_rate ?
|
|
s->streams[i]->codec->bit_rate :
|
|
s->streams[i]->codec->rc_max_rate;
|
|
if (os->bit_rate) {
|
|
snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
|
|
" bandwidth=\"%d\"", os->bit_rate);
|
|
} else {
|
|
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) {
|
|
ret = AVERROR(EINVAL);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
ctx = avformat_alloc_context();
|
|
if (!ctx) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
os->ctx = ctx;
|
|
ctx->oformat = oformat;
|
|
ctx->interrupt_callback = s->interrupt_callback;
|
|
|
|
if (!(st = avformat_new_stream(ctx, NULL))) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
avcodec_copy_context(st->codec, s->streams[i]->codec);
|
|
st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
|
|
st->time_base = s->streams[i]->time_base;
|
|
ctx->avoid_negative_ts = s->avoid_negative_ts;
|
|
|
|
ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, dash_write, NULL);
|
|
if (!ctx->pb) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
|
|
if (c->single_file) {
|
|
if (c->single_file_name)
|
|
dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
|
|
else
|
|
snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
|
|
} else {
|
|
dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
|
|
}
|
|
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
|
|
ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
|
|
if (ret < 0)
|
|
goto fail;
|
|
os->init_start_pos = 0;
|
|
|
|
av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0);
|
|
if ((ret = avformat_write_header(ctx, &opts)) < 0) {
|
|
goto fail;
|
|
}
|
|
os->ctx_inited = 1;
|
|
avio_flush(ctx->pb);
|
|
av_dict_free(&opts);
|
|
|
|
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->codec->codec_type == AVMEDIA_TYPE_VIDEO)
|
|
c->has_video = 1;
|
|
else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
|
|
c->has_audio = 1;
|
|
|
|
set_codec_str(s, st->codec, 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 (!c->has_video && c->min_seg_duration <= 0) {
|
|
av_log(s, AV_LOG_WARNING, "no video stream and no min seg duration set\n");
|
|
ret = AVERROR(EINVAL);
|
|
}
|
|
ret = write_manifest(s, 0);
|
|
if (!ret)
|
|
av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->filename);
|
|
|
|
fail:
|
|
if (ret)
|
|
dash_free(s);
|
|
return ret;
|
|
}
|
|
|
|
static int add_segment(OutputStream *os, const char *file,
|
|
int64_t time, int duration,
|
|
int64_t start_pos, int64_t range_length,
|
|
int64_t index_length)
|
|
{
|
|
int err;
|
|
Segment *seg;
|
|
if (os->nb_segments >= os->segments_size) {
|
|
os->segments_size = (os->segments_size + 1) * 2;
|
|
if ((err = av_reallocp(&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++;
|
|
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];
|
|
URLContext *fd;
|
|
int ret;
|
|
|
|
ret = ffurl_open(&fd, full_path, AVIO_FLAG_READ, &s->interrupt_callback, NULL);
|
|
if (ret < 0)
|
|
return;
|
|
if (ffurl_seek(fd, pos, SEEK_SET) != pos) {
|
|
ffurl_close(fd);
|
|
return;
|
|
}
|
|
ret = ffurl_read(fd, buf, 8);
|
|
ffurl_close(fd);
|
|
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,
|
|
AVCodecContext *codec)
|
|
{
|
|
uint8_t *extradata;
|
|
|
|
if (os->ctx->streams[0]->codec->extradata_size || !codec->extradata_size)
|
|
return 0;
|
|
|
|
extradata = av_malloc(codec->extradata_size);
|
|
|
|
if (!extradata)
|
|
return AVERROR(ENOMEM);
|
|
|
|
memcpy(extradata, codec->extradata, codec->extradata_size);
|
|
|
|
os->ctx->streams[0]->codec->extradata = extradata;
|
|
os->ctx->streams[0]->codec->extradata_size = codec->extradata_size;
|
|
|
|
set_codec_str(s, codec, os->codec_str, sizeof(os->codec_str));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dash_flush(AVFormatContext *s, int final, int stream)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
int i, ret = 0;
|
|
int cur_flush_segment_index = 0;
|
|
if (stream >= 0)
|
|
cur_flush_segment_index = c->streams[stream].segment_index;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
char filename[1024] = "", full_path[1024], temp_path[1024];
|
|
int64_t start_pos;
|
|
int range_length, index_length = 0;
|
|
|
|
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[i]->codec->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 (!os->init_range_length) {
|
|
av_write_frame(os->ctx, NULL);
|
|
os->init_range_length = avio_tell(os->ctx->pb);
|
|
if (!c->single_file) {
|
|
ffurl_close(os->out);
|
|
os->out = NULL;
|
|
}
|
|
}
|
|
|
|
start_pos = avio_tell(os->ctx->pb);
|
|
|
|
if (!c->single_file) {
|
|
dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_pts);
|
|
snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
|
|
snprintf(temp_path, sizeof(temp_path), "%s.tmp", full_path);
|
|
ret = ffurl_open(&os->out, temp_path, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
|
|
if (ret < 0)
|
|
break;
|
|
write_styp(os->ctx->pb);
|
|
} else {
|
|
snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, os->initfile);
|
|
}
|
|
|
|
av_write_frame(os->ctx, NULL);
|
|
avio_flush(os->ctx->pb);
|
|
os->packets_written = 0;
|
|
|
|
range_length = avio_tell(os->ctx->pb) - start_pos;
|
|
if (c->single_file) {
|
|
find_index_range(s, full_path, start_pos, &index_length);
|
|
} else {
|
|
ffurl_close(os->out);
|
|
os->out = NULL;
|
|
ret = ff_rename(temp_path, full_path, s);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
add_segment(os, filename, os->start_pts, os->max_pts - os->start_pts, start_pos, range_length, index_length);
|
|
av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, full_path);
|
|
}
|
|
|
|
if (c->window_size || (final && c->remove_at_exit)) {
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
int j;
|
|
int remove = os->nb_segments - c->window_size - c->extra_window_size;
|
|
if (final && c->remove_at_exit)
|
|
remove = os->nb_segments;
|
|
if (remove > 0) {
|
|
for (j = 0; j < remove; j++) {
|
|
char filename[1024];
|
|
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file);
|
|
unlink(filename);
|
|
av_free(os->segments[j]);
|
|
}
|
|
os->nb_segments -= remove;
|
|
memmove(os->segments, os->segments + remove, os->nb_segments * sizeof(*os->segments));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ret >= 0)
|
|
ret = write_manifest(s, final);
|
|
return ret;
|
|
}
|
|
|
|
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];
|
|
int64_t seg_end_duration = (os->segment_index) * (int64_t) c->min_seg_duration;
|
|
int ret;
|
|
|
|
ret = update_stream_extradata(s, os, st->codec);
|
|
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 (os->first_pts == AV_NOPTS_VALUE)
|
|
os->first_pts = pkt->pts;
|
|
|
|
if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
|
|
pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
|
|
av_compare_ts(pkt->pts - os->first_pts, st->time_base,
|
|
seg_end_duration, AV_TIME_BASE_Q) >= 0) {
|
|
int64_t prev_duration = c->last_duration;
|
|
|
|
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) && prev_duration) {
|
|
if (c->last_duration < prev_duration*9/10 ||
|
|
c->last_duration > prev_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 ((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);
|
|
os->packets_written++;
|
|
return ff_write_chained(os->ctx, 0, pkt, s, 0);
|
|
}
|
|
|
|
static int dash_write_trailer(AVFormatContext *s)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
|
|
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) {
|
|
char filename[1024];
|
|
int i;
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
|
|
unlink(filename);
|
|
}
|
|
unlink(s->filename);
|
|
}
|
|
|
|
dash_free(s);
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(DASHContext, x)
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{ "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 },
|
|
{ "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
|
|
{ "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
|
|
{ "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
|
|
{ "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
|
|
{ "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_INT, { .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$RepresentationID$.m4s"}, 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$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass dash_class = {
|
|
.class_name = "dash muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVOutputFormat ff_dash_muxer = {
|
|
.name = "dash",
|
|
.long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
|
|
.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,
|
|
.write_header = dash_write_header,
|
|
.write_packet = dash_write_packet,
|
|
.write_trailer = dash_write_trailer,
|
|
.codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
|
|
.priv_class = &dash_class,
|
|
};
|