mirror of https://git.ffmpeg.org/ffmpeg.git
973 lines
36 KiB
C
973 lines
36 KiB
C
/*
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* MPEG-DASH ISO BMFF segmenter
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* Copyright (c) 2014 Martin Storsjo
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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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#include "config.h"
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/rational.h"
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#include "libavutil/time_internal.h"
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#include "avc.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "isom.h"
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#include "os_support.h"
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#include "url.h"
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#include "dash.h"
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typedef struct Segment {
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char file[1024];
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int64_t start_pos;
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int range_length, index_length;
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int64_t time;
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int duration;
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int n;
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} Segment;
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typedef struct OutputStream {
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AVFormatContext *ctx;
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int ctx_inited;
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uint8_t iobuf[32768];
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AVIOContext *out;
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int packets_written;
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char initfile[1024];
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int64_t init_start_pos;
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int init_range_length;
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int nb_segments, segments_size, segment_index;
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Segment **segments;
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int64_t first_pts, start_pts, max_pts;
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int64_t last_dts;
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int bit_rate;
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char bandwidth_str[64];
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char codec_str[100];
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} OutputStream;
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typedef struct DASHContext {
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const AVClass *class; /* Class for private options. */
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int window_size;
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int extra_window_size;
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int min_seg_duration;
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int remove_at_exit;
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int use_template;
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int use_timeline;
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int single_file;
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OutputStream *streams;
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int has_video, has_audio;
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int64_t last_duration;
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int64_t total_duration;
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char availability_start_time[100];
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char dirname[1024];
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const char *single_file_name;
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const char *init_seg_name;
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const char *media_seg_name;
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AVRational min_frame_rate, max_frame_rate;
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int ambiguous_frame_rate;
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const char *utc_timing_url;
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} DASHContext;
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static int dash_write(void *opaque, uint8_t *buf, int buf_size)
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{
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OutputStream *os = opaque;
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if (os->out)
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avio_write(os->out, buf, buf_size);
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return buf_size;
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}
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// RFC 6381
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static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,
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char *str, int size)
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{
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const AVCodecTag *tags[2] = { NULL, NULL };
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uint32_t tag;
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if (par->codec_type == AVMEDIA_TYPE_VIDEO)
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tags[0] = ff_codec_movvideo_tags;
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else if (par->codec_type == AVMEDIA_TYPE_AUDIO)
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tags[0] = ff_codec_movaudio_tags;
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else
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return;
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tag = av_codec_get_tag(tags, par->codec_id);
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if (!tag)
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return;
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if (size < 5)
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return;
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AV_WL32(str, tag);
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str[4] = '\0';
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if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
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uint32_t oti;
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tags[0] = ff_mp4_obj_type;
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oti = av_codec_get_tag(tags, par->codec_id);
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if (oti)
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av_strlcatf(str, size, ".%02"PRIx32, oti);
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else
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return;
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if (tag == MKTAG('m', 'p', '4', 'a')) {
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if (par->extradata_size >= 2) {
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int aot = par->extradata[0] >> 3;
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if (aot == 31)
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aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
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av_strlcatf(str, size, ".%d", aot);
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}
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} else if (tag == MKTAG('m', 'p', '4', 'v')) {
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// Unimplemented, should output ProfileLevelIndication as a decimal number
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av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
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}
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} else if (!strcmp(str, "avc1")) {
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uint8_t *tmpbuf = NULL;
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uint8_t *extradata = par->extradata;
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int extradata_size = par->extradata_size;
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if (!extradata_size)
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return;
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if (extradata[0] != 1) {
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AVIOContext *pb;
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if (avio_open_dyn_buf(&pb) < 0)
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return;
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if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
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ffio_free_dyn_buf(&pb);
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return;
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}
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extradata_size = avio_close_dyn_buf(pb, &extradata);
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tmpbuf = extradata;
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}
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if (extradata_size >= 4)
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av_strlcatf(str, size, ".%02x%02x%02x",
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extradata[1], extradata[2], extradata[3]);
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av_free(tmpbuf);
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}
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}
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static void dash_free(AVFormatContext *s)
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{
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DASHContext *c = s->priv_data;
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int i, j;
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if (!c->streams)
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return;
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for (i = 0; i < s->nb_streams; i++) {
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OutputStream *os = &c->streams[i];
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if (os->ctx && os->ctx_inited)
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av_write_trailer(os->ctx);
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if (os->ctx && os->ctx->pb)
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av_free(os->ctx->pb);
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ff_format_io_close(s, &os->out);
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if (os->ctx)
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avformat_free_context(os->ctx);
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for (j = 0; j < os->nb_segments; j++)
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av_free(os->segments[j]);
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av_free(os->segments);
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}
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av_freep(&c->streams);
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}
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static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext *c)
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{
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int i, start_index = 0, start_number = 1;
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if (c->window_size) {
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start_index = FFMAX(os->nb_segments - c->window_size, 0);
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start_number = FFMAX(os->segment_index - c->window_size, 1);
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}
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if (c->use_template) {
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int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
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avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
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if (!c->use_timeline)
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avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration);
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avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
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if (c->use_timeline) {
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int64_t cur_time = 0;
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avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
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for (i = start_index; i < os->nb_segments; ) {
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Segment *seg = os->segments[i];
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int repeat = 0;
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avio_printf(out, "\t\t\t\t\t\t<S ");
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if (i == start_index || seg->time != cur_time) {
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cur_time = seg->time;
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avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
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}
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avio_printf(out, "d=\"%d\" ", seg->duration);
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while (i + repeat + 1 < os->nb_segments &&
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os->segments[i + repeat + 1]->duration == seg->duration &&
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os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
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repeat++;
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if (repeat > 0)
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avio_printf(out, "r=\"%d\" ", repeat);
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avio_printf(out, "/>\n");
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i += 1 + repeat;
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cur_time += (1 + repeat) * seg->duration;
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}
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avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
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}
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avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
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} else if (c->single_file) {
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avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
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avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
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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);
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for (i = start_index; i < os->nb_segments; i++) {
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Segment *seg = os->segments[i];
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avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
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if (seg->index_length)
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avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
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avio_printf(out, "/>\n");
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}
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avio_printf(out, "\t\t\t\t</SegmentList>\n");
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} else {
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avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
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avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
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for (i = start_index; i < os->nb_segments; i++) {
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Segment *seg = os->segments[i];
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avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
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}
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avio_printf(out, "\t\t\t\t</SegmentList>\n");
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}
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}
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static char *xmlescape(const char *str) {
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int outlen = strlen(str)*3/2 + 6;
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char *out = av_realloc(NULL, outlen + 1);
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int pos = 0;
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if (!out)
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return NULL;
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for (; *str; str++) {
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if (pos + 6 > outlen) {
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char *tmp;
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outlen = 2 * outlen + 6;
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tmp = av_realloc(out, outlen + 1);
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if (!tmp) {
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av_free(out);
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return NULL;
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}
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out = tmp;
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}
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if (*str == '&') {
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memcpy(&out[pos], "&", 5);
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pos += 5;
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} else if (*str == '<') {
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memcpy(&out[pos], "<", 4);
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pos += 4;
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} else if (*str == '>') {
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memcpy(&out[pos], ">", 4);
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pos += 4;
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} else if (*str == '\'') {
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memcpy(&out[pos], "'", 6);
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pos += 6;
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} else if (*str == '\"') {
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memcpy(&out[pos], """, 6);
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pos += 6;
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} else {
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out[pos++] = *str;
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}
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}
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out[pos] = '\0';
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return out;
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}
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static void write_time(AVIOContext *out, int64_t time)
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{
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int seconds = time / AV_TIME_BASE;
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int fractions = time % AV_TIME_BASE;
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int minutes = seconds / 60;
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int hours = minutes / 60;
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seconds %= 60;
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minutes %= 60;
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avio_printf(out, "PT");
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if (hours)
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avio_printf(out, "%dH", hours);
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if (hours || minutes)
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avio_printf(out, "%dM", minutes);
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avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
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}
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static void format_date_now(char *buf, int size)
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{
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time_t t = time(NULL);
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struct tm *ptm, tmbuf;
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ptm = gmtime_r(&t, &tmbuf);
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if (ptm) {
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if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%SZ", ptm))
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buf[0] = '\0';
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}
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}
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static int write_manifest(AVFormatContext *s, int final)
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{
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DASHContext *c = s->priv_data;
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AVIOContext *out;
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char temp_filename[1024];
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int ret, i, as_id = 0;
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const char *proto = avio_find_protocol_name(s->filename);
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int use_rename = proto && !strcmp(proto, "file");
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static unsigned int warned_non_file = 0;
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AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
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if (!use_rename && !warned_non_file++)
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av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
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snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
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ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
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return ret;
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}
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avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
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avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
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"\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
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"\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
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"\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
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"\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
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"\ttype=\"%s\"\n", final ? "static" : "dynamic");
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if (final) {
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avio_printf(out, "\tmediaPresentationDuration=\"");
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write_time(out, c->total_duration);
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avio_printf(out, "\"\n");
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} else {
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int64_t update_period = c->last_duration / AV_TIME_BASE;
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char now_str[100];
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if (c->use_template && !c->use_timeline)
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update_period = 500;
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avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);
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avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);
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if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {
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format_date_now(c->availability_start_time, sizeof(c->availability_start_time));
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}
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if (c->availability_start_time[0])
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avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
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format_date_now(now_str, sizeof(now_str));
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if (now_str[0])
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avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);
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if (c->window_size && c->use_template) {
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avio_printf(out, "\ttimeShiftBufferDepth=\"");
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write_time(out, c->last_duration * c->window_size);
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avio_printf(out, "\"\n");
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}
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}
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avio_printf(out, "\tminBufferTime=\"");
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write_time(out, c->last_duration * 2);
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avio_printf(out, "\">\n");
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avio_printf(out, "\t<ProgramInformation>\n");
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if (title) {
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char *escaped = xmlescape(title->value);
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avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
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av_free(escaped);
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}
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avio_printf(out, "\t</ProgramInformation>\n");
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if (c->utc_timing_url)
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avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
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if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
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OutputStream *os = &c->streams[0];
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int start_index = FFMAX(os->nb_segments - c->window_size, 0);
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int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
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avio_printf(out, "\t<Period id=\"0\" start=\"");
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write_time(out, start_time);
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avio_printf(out, "\">\n");
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} else {
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avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");
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}
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if (c->has_video) {
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avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"video\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"", as_id++);
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if (c->max_frame_rate.num && !c->ambiguous_frame_rate)
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avio_printf(out, " %s=\"%d/%d\"", (av_cmp_q(c->min_frame_rate, c->max_frame_rate) < 0) ? "maxFrameRate" : "frameRate", c->max_frame_rate.num, c->max_frame_rate.den);
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avio_printf(out, ">\n");
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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OutputStream *os = &c->streams[i];
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if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
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continue;
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avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"", i, os->codec_str, os->bandwidth_str, st->codecpar->width, st->codecpar->height);
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if (st->avg_frame_rate.num)
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avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
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avio_printf(out, ">\n");
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output_segment_list(&c->streams[i], out, c);
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avio_printf(out, "\t\t\t</Representation>\n");
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}
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avio_printf(out, "\t\t</AdaptationSet>\n");
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|
}
|
|
if (c->has_audio) {
|
|
avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"audio\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n", as_id++);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
OutputStream *os = &c->streams[i];
|
|
|
|
if (st->codecpar->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->codecpar->sample_rate);
|
|
avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", st->codecpar->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);
|
|
ff_format_io_close(s, &out);
|
|
|
|
if (use_rename)
|
|
return avpriv_io_move(temp_filename, s->filename);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_bitrate(AVFormatContext *s)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
int i;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
|
|
os->bit_rate = s->streams[i]->codecpar->bit_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)
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dash_init(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;
|
|
c->ambiguous_frame_rate = 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)
|
|
return AVERROR_MUXER_NOT_FOUND;
|
|
|
|
c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
|
|
if (!c->streams)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = set_bitrate(s);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OutputStream *os = &c->streams[i];
|
|
AVFormatContext *ctx;
|
|
AVStream *st;
|
|
AVDictionary *opts = NULL;
|
|
char filename[1024];
|
|
|
|
ctx = avformat_alloc_context();
|
|
if (!ctx)
|
|
return AVERROR(ENOMEM);
|
|
os->ctx = ctx;
|
|
ctx->oformat = oformat;
|
|
ctx->interrupt_callback = s->interrupt_callback;
|
|
ctx->opaque = s->opaque;
|
|
ctx->io_close = s->io_close;
|
|
ctx->io_open = s->io_open;
|
|
|
|
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;
|
|
ctx->avoid_negative_ts = s->avoid_negative_ts;
|
|
ctx->flags = s->flags;
|
|
|
|
ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, dash_write, NULL);
|
|
if (!ctx->pb)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (c->single_file) {
|
|
if (c->single_file_name)
|
|
ff_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 {
|
|
ff_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 = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
os->init_start_pos = 0;
|
|
|
|
av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0);
|
|
if ((ret = avformat_init_output(ctx, &opts)) < 0)
|
|
return ret;
|
|
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->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
|
|
if (avg_frame_rate.num > 0) {
|
|
if (av_cmp_q(avg_frame_rate, c->min_frame_rate) < 0)
|
|
c->min_frame_rate = avg_frame_rate;
|
|
if (av_cmp_q(c->max_frame_rate, avg_frame_rate) < 0)
|
|
c->max_frame_rate = avg_frame_rate;
|
|
} else {
|
|
c->ambiguous_frame_rate = 1;
|
|
}
|
|
c->has_video = 1;
|
|
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
|
|
c->has_audio = 1;
|
|
}
|
|
|
|
set_codec_str(s, st->codecpar, 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");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
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) {
|
|
dash_free(s);
|
|
return ret;
|
|
}
|
|
}
|
|
ret = write_manifest(s, 0);
|
|
if (!ret)
|
|
av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->filename);
|
|
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];
|
|
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,
|
|
AVCodecParameters *par)
|
|
{
|
|
uint8_t *extradata;
|
|
|
|
if (os->ctx->streams[0]->codecpar->extradata_size || !par->extradata_size)
|
|
return 0;
|
|
|
|
extradata = av_malloc(par->extradata_size);
|
|
|
|
if (!extradata)
|
|
return AVERROR(ENOMEM);
|
|
|
|
memcpy(extradata, par->extradata, par->extradata_size);
|
|
|
|
os->ctx->streams[0]->codecpar->extradata = extradata;
|
|
os->ctx->streams[0]->codecpar->extradata_size = par->extradata_size;
|
|
|
|
set_codec_str(s, par, 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;
|
|
|
|
const char *proto = avio_find_protocol_name(s->filename);
|
|
int use_rename = proto && !strcmp(proto, "file");
|
|
|
|
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]->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 (!os->init_range_length) {
|
|
av_write_frame(os->ctx, NULL);
|
|
os->init_range_length = avio_tell(os->ctx->pb);
|
|
if (!c->single_file)
|
|
ff_format_io_close(s, &os->out);
|
|
}
|
|
|
|
start_pos = avio_tell(os->ctx->pb);
|
|
|
|
if (!c->single_file) {
|
|
ff_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), use_rename ? "%s.tmp" : "%s", full_path);
|
|
ret = s->io_open(s, &os->out, temp_path, AVIO_FLAG_WRITE, 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 {
|
|
ff_format_io_close(s, &os->out);
|
|
|
|
if (use_rename) {
|
|
ret = avpriv_io_move(temp_path, full_path);
|
|
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];
|
|
int ret;
|
|
|
|
ret = update_stream_extradata(s, os, st->codecpar);
|
|
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->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
|
|
pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
|
|
av_compare_ts(pkt->pts - os->start_pts, st->time_base,
|
|
c->min_seg_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;
|
|
|
|
set_bitrate(s);
|
|
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)
|
|
{
|
|
DASHContext *c = s->priv_data;
|
|
OutputStream *os = &c->streams[avpkt->stream_index];
|
|
AVFormatContext *oc = os->ctx;
|
|
if (oc->oformat->check_bitstream) {
|
|
int ret;
|
|
AVPacket pkt = *avpkt;
|
|
pkt.stream_index = 0;
|
|
ret = oc->oformat->check_bitstream(oc, &pkt);
|
|
if (ret == 1) {
|
|
AVStream *st = s->streams[avpkt->stream_index];
|
|
AVStream *ost = oc->streams[0];
|
|
st->internal->bsfcs = ost->internal->bsfcs;
|
|
st->internal->nb_bsfcs = ost->internal->nb_bsfcs;
|
|
ost->internal->bsfcs = NULL;
|
|
ost->internal->nb_bsfcs = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#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_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$RepresentationID$.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 },
|
|
{ "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 },
|
|
{ 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,
|
|
.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,
|
|
};
|