f38d01714a
Mostly using intermediate pointers for accesses (i.e. storing s->pb in a
variable pb and then using pb for writing instead of s->pb) to improve
readability. Furthermore, the opening brace '{' of a function has been
moved into a line of its own in instances where it wasn't before.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
549 lines
21 KiB
C
549 lines
21 KiB
C
/*
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* WebM DASH Manifest XML muxer
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* Copyright (c) 2014 Vignesh Venkatasubramanian
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* WebM DASH Specification:
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* https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
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* ISO DASH Specification:
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* http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip
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*/
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#include <float.h>
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#include <stdint.h>
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#include <string.h>
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#include "avformat.h"
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#include "matroska.h"
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#include "libavutil/avstring.h"
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#include "libavutil/dict.h"
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#include "libavutil/opt.h"
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#include "libavutil/time_internal.h"
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typedef struct AdaptationSet {
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char id[10];
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int *streams;
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int nb_streams;
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} AdaptationSet;
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typedef struct WebMDashMuxContext {
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const AVClass *class;
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char *adaptation_sets;
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AdaptationSet *as;
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int nb_as;
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int representation_id;
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int is_live;
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int chunk_start_index;
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int chunk_duration;
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char *utc_timing_url;
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double time_shift_buffer_depth;
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int minimum_update_period;
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} WebMDashMuxContext;
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static const char *get_codec_name(int codec_id)
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{
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return avcodec_descriptor_get(codec_id)->name;
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}
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static double get_duration(AVFormatContext *s)
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{
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int i = 0;
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double max = 0.0;
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for (i = 0; i < s->nb_streams; i++) {
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AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata,
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DURATION, NULL, 0);
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if (!duration || atof(duration->value) < 0) continue;
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if (atof(duration->value) > max) max = atof(duration->value);
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}
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return max / 1000;
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}
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static int write_header(AVFormatContext *s)
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{
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WebMDashMuxContext *w = s->priv_data;
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AVIOContext *pb = s->pb;
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double min_buffer_time = 1.0;
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avio_printf(pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
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avio_printf(pb, "<MPD\n");
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avio_printf(pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
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avio_printf(pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
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avio_printf(pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
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avio_printf(pb, " type=\"%s\"\n", w->is_live ? "dynamic" : "static");
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if (!w->is_live) {
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avio_printf(pb, " mediaPresentationDuration=\"PT%gS\"\n",
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get_duration(s));
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}
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avio_printf(pb, " minBufferTime=\"PT%gS\"\n", min_buffer_time);
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avio_printf(pb, " profiles=\"%s\"%s",
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w->is_live ? "urn:mpeg:dash:profile:isoff-live:2011" : "urn:webm:dash:profile:webm-on-demand:2012",
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w->is_live ? "\n" : ">\n");
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if (w->is_live) {
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time_t local_time = time(NULL);
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struct tm gmt_buffer;
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struct tm *gmt = gmtime_r(&local_time, &gmt_buffer);
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char gmt_iso[21];
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if (!strftime(gmt_iso, 21, "%Y-%m-%dT%H:%M:%SZ", gmt)) {
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return AVERROR_UNKNOWN;
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}
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if (s->flags & AVFMT_FLAG_BITEXACT) {
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av_strlcpy(gmt_iso, "", 1);
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}
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avio_printf(pb, " availabilityStartTime=\"%s\"\n", gmt_iso);
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avio_printf(pb, " timeShiftBufferDepth=\"PT%gS\"\n", w->time_shift_buffer_depth);
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avio_printf(pb, " minimumUpdatePeriod=\"PT%dS\"", w->minimum_update_period);
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avio_printf(pb, ">\n");
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if (w->utc_timing_url) {
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avio_printf(pb, "<UTCTiming\n");
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avio_printf(pb, " schemeIdUri=\"urn:mpeg:dash:utc:http-iso:2014\"\n");
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avio_printf(pb, " value=\"%s\"/>\n", w->utc_timing_url);
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}
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}
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return 0;
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}
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static void write_footer(AVFormatContext *s)
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{
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avio_printf(s->pb, "</MPD>\n");
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}
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static int subsegment_alignment(AVFormatContext *s, const AdaptationSet *as)
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{
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int i;
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AVDictionaryEntry *gold = av_dict_get(s->streams[as->streams[0]]->metadata,
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CUE_TIMESTAMPS, NULL, 0);
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if (!gold) return 0;
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for (i = 1; i < as->nb_streams; i++) {
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AVDictionaryEntry *ts = av_dict_get(s->streams[as->streams[i]]->metadata,
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CUE_TIMESTAMPS, NULL, 0);
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if (!ts || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
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}
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return 1;
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}
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static int bitstream_switching(AVFormatContext *s, const AdaptationSet *as)
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{
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int i;
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const AVStream *gold_st = s->streams[as->streams[0]];
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AVDictionaryEntry *gold_track_num = av_dict_get(gold_st->metadata,
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TRACK_NUMBER, NULL, 0);
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AVCodecParameters *gold_par = gold_st->codecpar;
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if (!gold_track_num) return 0;
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for (i = 1; i < as->nb_streams; i++) {
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const AVStream *st = s->streams[as->streams[i]];
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AVDictionaryEntry *track_num = av_dict_get(st->metadata,
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TRACK_NUMBER, NULL, 0);
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AVCodecParameters *par = st->codecpar;
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if (!track_num ||
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strncmp(gold_track_num->value, track_num->value, strlen(gold_track_num->value)) ||
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gold_par->codec_id != par->codec_id ||
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gold_par->extradata_size != par->extradata_size ||
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memcmp(gold_par->extradata, par->extradata, par->extradata_size)) {
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return 0;
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}
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}
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return 1;
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}
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/*
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* Writes a Representation within an Adaptation Set. Returns 0 on success and
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* < 0 on failure.
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*/
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static int write_representation(AVFormatContext *s, AVStream *st, char *id,
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int output_width, int output_height,
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int output_sample_rate)
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{
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WebMDashMuxContext *w = s->priv_data;
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AVIOContext *pb = s->pb;
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const AVCodecParameters *par = st->codecpar;
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AVDictionaryEntry *bandwidth = av_dict_get(st->metadata, BANDWIDTH, NULL, 0);
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const char *bandwidth_str;
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avio_printf(pb, "<Representation id=\"%s\"", id);
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if (bandwidth) {
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bandwidth_str = bandwidth->value;
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} else if (w->is_live) {
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// if bandwidth for live was not provided, use a default
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bandwidth_str = (par->codec_type == AVMEDIA_TYPE_AUDIO) ? "128000" : "1000000";
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} else {
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return AVERROR(EINVAL);
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}
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avio_printf(pb, " bandwidth=\"%s\"", bandwidth_str);
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if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
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avio_printf(pb, " width=\"%d\"", par->width);
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if (par->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
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avio_printf(pb, " height=\"%d\"", par->height);
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if (par->codec_type == AVMEDIA_TYPE_AUDIO && output_sample_rate)
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avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
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if (w->is_live) {
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// For live streams, Codec and Mime Type always go in the Representation tag.
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avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
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avio_printf(pb, " mimeType=\"%s/webm\"",
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par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
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// For live streams, subsegments always start with key frames. So this
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// is always 1.
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avio_printf(pb, " startsWithSAP=\"1\"");
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avio_printf(pb, ">");
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} else {
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AVDictionaryEntry *irange = av_dict_get(st->metadata, INITIALIZATION_RANGE, NULL, 0);
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AVDictionaryEntry *cues_start = av_dict_get(st->metadata, CUES_START, NULL, 0);
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AVDictionaryEntry *cues_end = av_dict_get(st->metadata, CUES_END, NULL, 0);
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AVDictionaryEntry *filename = av_dict_get(st->metadata, FILENAME, NULL, 0);
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if (!irange || !cues_start || !cues_end || !filename)
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return AVERROR(EINVAL);
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avio_printf(pb, ">\n");
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avio_printf(pb, "<BaseURL>%s</BaseURL>\n", filename->value);
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avio_printf(pb, "<SegmentBase\n");
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avio_printf(pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
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avio_printf(pb, "<Initialization\n");
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avio_printf(pb, " range=\"0-%s\" />\n", irange->value);
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avio_printf(pb, "</SegmentBase>\n");
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}
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avio_printf(pb, "</Representation>\n");
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return 0;
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}
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/*
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* Checks if width of all streams are the same. Returns 1 if true, 0 otherwise.
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*/
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static int check_matching_width(AVFormatContext *s, const AdaptationSet *as)
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{
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int first_width, i;
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if (as->nb_streams < 2) return 1;
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first_width = s->streams[as->streams[0]]->codecpar->width;
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for (i = 1; i < as->nb_streams; i++)
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if (first_width != s->streams[as->streams[i]]->codecpar->width)
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return 0;
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return 1;
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}
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/*
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* Checks if height of all streams are the same. Returns 1 if true, 0 otherwise.
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*/
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static int check_matching_height(AVFormatContext *s, const AdaptationSet *as)
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{
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int first_height, i;
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if (as->nb_streams < 2) return 1;
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first_height = s->streams[as->streams[0]]->codecpar->height;
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for (i = 1; i < as->nb_streams; i++)
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if (first_height != s->streams[as->streams[i]]->codecpar->height)
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return 0;
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return 1;
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}
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/*
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* Checks if sample rate of all streams are the same. Returns 1 if true, 0 otherwise.
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*/
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static int check_matching_sample_rate(AVFormatContext *s, const AdaptationSet *as)
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{
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int first_sample_rate, i;
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if (as->nb_streams < 2) return 1;
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first_sample_rate = s->streams[as->streams[0]]->codecpar->sample_rate;
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for (i = 1; i < as->nb_streams; i++)
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if (first_sample_rate != s->streams[as->streams[i]]->codecpar->sample_rate)
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return 0;
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return 1;
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}
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static void free_adaptation_sets(AVFormatContext *s)
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{
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WebMDashMuxContext *w = s->priv_data;
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int i;
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for (i = 0; i < w->nb_as; i++) {
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av_freep(&w->as[i].streams);
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}
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av_freep(&w->as);
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w->nb_as = 0;
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}
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/*
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* Parses a live header filename and returns the position of the '_' and '.'
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* delimiting <file_description> and <representation_id>.
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*
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* Name of the header file should conform to the following pattern:
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* <file_description>_<representation_id>.hdr where <file_description> can be
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* anything. The chunks should be named according to the following pattern:
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* <file_description>_<representation_id>_<chunk_number>.chk
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*/
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static int split_filename(char *filename, char **underscore_pos,
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char **period_pos)
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{
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*underscore_pos = strrchr(filename, '_');
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if (!*underscore_pos)
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return AVERROR(EINVAL);
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*period_pos = strchr(*underscore_pos, '.');
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if (!*period_pos)
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return AVERROR(EINVAL);
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return 0;
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}
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/*
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* Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
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*/
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static int write_adaptation_set(AVFormatContext *s, int as_index)
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{
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WebMDashMuxContext *w = s->priv_data;
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AdaptationSet *as = &w->as[as_index];
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const AVStream *st = s->streams[as->streams[0]];
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AVCodecParameters *par = st->codecpar;
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AVDictionaryEntry *lang;
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AVIOContext *pb = s->pb;
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int i;
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static const char boolean[2][6] = { "false", "true" };
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int subsegmentStartsWithSAP = 1;
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// Width, Height and Sample Rate will go in the AdaptationSet tag if they
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// are the same for all contained Representations. otherwise, they will go
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// on their respective Representation tag. For live streams, they always go
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// in the Representation tag.
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int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
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if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
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width_in_as = !w->is_live && check_matching_width (s, as);
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height_in_as = !w->is_live && check_matching_height(s, as);
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} else {
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sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
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}
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avio_printf(pb, "<AdaptationSet id=\"%s\"", as->id);
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avio_printf(pb, " mimeType=\"%s/webm\"",
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par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
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avio_printf(pb, " codecs=\"%s\"", get_codec_name(par->codec_id));
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lang = av_dict_get(st->metadata, "language", NULL, 0);
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if (lang)
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avio_printf(pb, " lang=\"%s\"", lang->value);
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if (par->codec_type == AVMEDIA_TYPE_VIDEO && width_in_as)
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avio_printf(pb, " width=\"%d\"", par->width);
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if (par->codec_type == AVMEDIA_TYPE_VIDEO && height_in_as)
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avio_printf(pb, " height=\"%d\"", par->height);
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if (par->codec_type == AVMEDIA_TYPE_AUDIO && sample_rate_in_as)
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avio_printf(pb, " audioSamplingRate=\"%d\"", par->sample_rate);
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avio_printf(pb, " bitstreamSwitching=\"%s\"",
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boolean[bitstream_switching(s, as)]);
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avio_printf(pb, " subsegmentAlignment=\"%s\"",
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boolean[w->is_live || subsegment_alignment(s, as)]);
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for (i = 0; i < as->nb_streams; i++) {
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AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
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CLUSTER_KEYFRAME, NULL, 0);
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if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
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}
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avio_printf(pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
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avio_printf(pb, ">\n");
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if (w->is_live) {
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AVDictionaryEntry *filename =
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av_dict_get(st->metadata, FILENAME, NULL, 0);
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char *underscore_pos, *period_pos;
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int ret;
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if (!filename)
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return AVERROR(EINVAL);
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ret = split_filename(filename->value, &underscore_pos, &period_pos);
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if (ret) return ret;
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*underscore_pos = '\0';
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avio_printf(pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
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par->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
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avio_printf(pb, "<SegmentTemplate");
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avio_printf(pb, " timescale=\"1000\"");
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avio_printf(pb, " duration=\"%d\"", w->chunk_duration);
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avio_printf(pb, " media=\"%s_$RepresentationID$_$Number$.chk\"",
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filename->value);
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avio_printf(pb, " startNumber=\"%d\"", w->chunk_start_index);
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avio_printf(pb, " initialization=\"%s_$RepresentationID$.hdr\"",
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filename->value);
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avio_printf(pb, "/>\n");
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*underscore_pos = '_';
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}
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for (i = 0; i < as->nb_streams; i++) {
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char buf[25], *representation_id = buf, *underscore_pos, *period_pos;
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AVStream *st = s->streams[as->streams[i]];
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int ret;
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if (w->is_live) {
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AVDictionaryEntry *filename =
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av_dict_get(st->metadata, FILENAME, NULL, 0);
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if (!filename)
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return AVERROR(EINVAL);
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ret = split_filename(filename->value, &underscore_pos, &period_pos);
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if (ret < 0)
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return ret;
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representation_id = underscore_pos + 1;
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*period_pos = '\0';
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} else {
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snprintf(buf, sizeof(buf), "%d", w->representation_id++);
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}
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ret = write_representation(s, st, representation_id, !width_in_as,
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!height_in_as, !sample_rate_in_as);
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if (ret) return ret;
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if (w->is_live)
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*period_pos = '.';
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}
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avio_printf(s->pb, "</AdaptationSet>\n");
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return 0;
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}
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static int parse_adaptation_sets(AVFormatContext *s)
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{
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WebMDashMuxContext *w = s->priv_data;
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char *p = w->adaptation_sets;
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char *q;
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enum { new_set, parsed_id, parsing_streams } state;
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if (!w->adaptation_sets) {
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av_log(s, AV_LOG_ERROR, "The 'adaptation_sets' option must be set.\n");
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return AVERROR(EINVAL);
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}
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// syntax id=0,streams=0,1,2 id=1,streams=3,4 and so on
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state = new_set;
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while (1) {
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if (*p == '\0') {
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if (state == new_set)
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break;
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else
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return AVERROR(EINVAL);
|
|
} else if (state == new_set && *p == ' ') {
|
|
p++;
|
|
continue;
|
|
} else if (state == new_set && !strncmp(p, "id=", 3)) {
|
|
void *mem = av_realloc(w->as, sizeof(*w->as) * (w->nb_as + 1));
|
|
const char *comma;
|
|
if (mem == NULL)
|
|
return AVERROR(ENOMEM);
|
|
w->as = mem;
|
|
++w->nb_as;
|
|
w->as[w->nb_as - 1].nb_streams = 0;
|
|
w->as[w->nb_as - 1].streams = NULL;
|
|
p += 3; // consume "id="
|
|
q = w->as[w->nb_as - 1].id;
|
|
comma = strchr(p, ',');
|
|
if (!comma || comma - p >= sizeof(w->as[w->nb_as - 1].id)) {
|
|
av_log(s, AV_LOG_ERROR, "'id' in 'adaptation_sets' is malformed.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
while (*p != ',') *q++ = *p++;
|
|
*q = 0;
|
|
p++;
|
|
state = parsed_id;
|
|
} else if (state == parsed_id && !strncmp(p, "streams=", 8)) {
|
|
p += 8; // consume "streams="
|
|
state = parsing_streams;
|
|
} else if (state == parsing_streams) {
|
|
struct AdaptationSet *as = &w->as[w->nb_as - 1];
|
|
int64_t num;
|
|
int ret = av_reallocp_array(&as->streams, ++as->nb_streams,
|
|
sizeof(*as->streams));
|
|
if (ret < 0)
|
|
return ret;
|
|
num = strtoll(p, &q, 10);
|
|
if (!av_isdigit(*p) || (*q != ' ' && *q != '\0' && *q != ',') ||
|
|
num < 0 || num >= s->nb_streams) {
|
|
av_log(s, AV_LOG_ERROR, "Invalid value for 'streams' in adapation_sets.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
as->streams[as->nb_streams - 1] = num;
|
|
if (*q == '\0') break;
|
|
if (*q == ' ') state = new_set;
|
|
p = ++q;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int webm_dash_manifest_write_header(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
double start = 0.0;
|
|
int ret;
|
|
WebMDashMuxContext *w = s->priv_data;
|
|
|
|
for (unsigned i = 0; i < s->nb_streams; i++) {
|
|
enum AVCodecID codec_id = s->streams[i]->codecpar->codec_id;
|
|
if (codec_id != AV_CODEC_ID_VP8 && codec_id != AV_CODEC_ID_VP9 &&
|
|
codec_id != AV_CODEC_ID_VORBIS && codec_id != AV_CODEC_ID_OPUS)
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
ret = parse_adaptation_sets(s);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
ret = write_header(s);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
avio_printf(s->pb, "<Period id=\"0\"");
|
|
avio_printf(s->pb, " start=\"PT%gS\"", start);
|
|
if (!w->is_live) {
|
|
avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
|
|
}
|
|
avio_printf(s->pb, " >\n");
|
|
|
|
for (i = 0; i < w->nb_as; i++) {
|
|
ret = write_adaptation_set(s, i);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
avio_printf(s->pb, "</Period>\n");
|
|
write_footer(s);
|
|
fail:
|
|
free_adaptation_sets(s);
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
static int webm_dash_manifest_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(WebMDashMuxContext, x)
|
|
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 },
|
|
{ "live", "create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ "chunk_start_index", "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ "chunk_duration_ms", "duration of each chunk (in milliseconds)", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ "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, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ "time_shift_buffer_depth", "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to be available.", OFFSET(time_shift_buffer_depth), AV_OPT_TYPE_DOUBLE, { .dbl = 60.0 }, 1.0, DBL_MAX, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ "minimum_update_period", "Minimum Update Period (in seconds) of the manifest.", OFFSET(minimum_update_period), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass webm_dash_class = {
|
|
.class_name = "WebM DASH Manifest muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVOutputFormat ff_webm_dash_manifest_muxer = {
|
|
.name = "webm_dash_manifest",
|
|
.long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
|
|
.mime_type = "application/xml",
|
|
.extensions = "xml",
|
|
.priv_data_size = sizeof(WebMDashMuxContext),
|
|
.write_header = webm_dash_manifest_write_header,
|
|
.write_packet = webm_dash_manifest_write_packet,
|
|
.priv_class = &webm_dash_class,
|
|
};
|