8b6aeb1fcd
From the M3U8 specification: |The EXT-X-MEDIA-SEQUENCE tag indicates the sequence number of the first |URI that appears in a Playlist file. Previously it was using the list index number. Also remove now unused list_count field.
587 lines
20 KiB
C
587 lines
20 KiB
C
/*
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* Copyright (c) 2011, Luca Barbato
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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* @file generic segmenter
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* M3U8 specification can be find here:
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* @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming-08.txt}
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*/
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#include <float.h>
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#include "avformat.h"
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#include "internal.h"
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#include "libavutil/avassert.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/avstring.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/mathematics.h"
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typedef enum {
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LIST_TYPE_UNDEFINED = -1,
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LIST_TYPE_FLAT = 0,
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LIST_TYPE_CSV,
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LIST_TYPE_M3U8,
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LIST_TYPE_EXT, ///< deprecated
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LIST_TYPE_NB,
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} ListType;
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#define SEGMENT_LIST_FLAG_CACHE 1
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#define SEGMENT_LIST_FLAG_LIVE 2
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typedef struct {
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const AVClass *class; /**< Class for private options. */
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int segment_idx; ///< index of the segment file to write, starting from 0
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int segment_idx_wrap; ///< number after which the index wraps
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int segment_count; ///< number of segment files already written
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AVOutputFormat *oformat;
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AVFormatContext *avf;
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char *format; ///< format to use for output segment files
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char *list; ///< filename for the segment list file
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int list_flags; ///< flags affecting list generation
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int list_size; ///< number of entries for the segment list file
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double list_max_segment_time; ///< max segment time in the current list
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ListType list_type; ///< set the list type
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AVIOContext *list_pb; ///< list file put-byte context
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char *time_str; ///< segment duration specification string
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int64_t time; ///< segment duration
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char *times_str; ///< segment times specification string
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int64_t *times; ///< list of segment interval specification
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int nb_times; ///< number of elments in the times array
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char *time_delta_str; ///< approximation value duration used for the segment times
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int64_t time_delta;
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int individual_header_trailer; /**< Set by a private option. */
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int write_header_trailer; /**< Set by a private option. */
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int has_video;
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double start_time, end_time;
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} SegmentContext;
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static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
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{
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int needs_quoting = !!str[strcspn(str, "\",\n\r")];
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if (needs_quoting)
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avio_w8(ctx, '"');
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for (; *str; str++) {
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if (*str == '"')
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avio_w8(ctx, '"');
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avio_w8(ctx, *str);
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}
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if (needs_quoting)
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avio_w8(ctx, '"');
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}
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static int segment_mux_init(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc;
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int i;
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seg->avf = oc = avformat_alloc_context();
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if (!oc)
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return AVERROR(ENOMEM);
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oc->oformat = seg->oformat;
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oc->interrupt_callback = s->interrupt_callback;
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st;
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AVCodecContext *icodec, *ocodec;
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if (!(st = avformat_new_stream(oc, NULL)))
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return AVERROR(ENOMEM);
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icodec = s->streams[i]->codec;
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ocodec = st->codec;
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avcodec_copy_context(ocodec, icodec);
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if (!oc->oformat->codec_tag ||
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av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == ocodec->codec_id ||
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av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0) {
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ocodec->codec_tag = icodec->codec_tag;
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} else {
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ocodec->codec_tag = 0;
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}
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st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
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}
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return 0;
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}
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static int segment_start(AVFormatContext *s, int write_header)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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int err = 0;
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if (write_header) {
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avformat_free_context(oc);
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seg->avf = NULL;
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if ((err = segment_mux_init(s)) < 0)
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return err;
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oc = seg->avf;
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}
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seg->segment_idx++;
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if (seg->segment_idx_wrap)
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seg->segment_idx %= seg->segment_idx_wrap;
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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s->filename, seg->segment_idx) < 0) {
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av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->filename);
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return AVERROR(EINVAL);
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}
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seg->segment_count++;
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if ((err = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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return err;
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if (oc->oformat->priv_class && oc->priv_data)
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av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */
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if (write_header) {
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if ((err = avformat_write_header(oc, NULL)) < 0)
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return err;
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}
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return 0;
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}
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static int segment_list_open(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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int ret;
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ret = avio_open2(&seg->list_pb, seg->list, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL);
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if (ret < 0)
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return ret;
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seg->list_max_segment_time = 0;
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if (seg->list_type == LIST_TYPE_M3U8) {
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avio_printf(seg->list_pb, "#EXTM3U\n");
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avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
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avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_idx);
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avio_printf(seg->list_pb, "#EXT-X-ALLOWCACHE:%d\n",
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!!(seg->list_flags & SEGMENT_LIST_FLAG_CACHE));
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if (seg->list_flags & SEGMENT_LIST_FLAG_LIVE)
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avio_printf(seg->list_pb,
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"#EXT-X-TARGETDURATION:%"PRId64"\n", seg->time / 1000000);
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}
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return ret;
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}
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static void segment_list_close(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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if (seg->list_type == LIST_TYPE_M3U8) {
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if (!(seg->list_flags & SEGMENT_LIST_FLAG_LIVE))
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avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%d\n",
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(int)ceil(seg->list_max_segment_time));
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avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
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}
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avio_close(seg->list_pb);
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}
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static int segment_end(AVFormatContext *s, int write_trailer)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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int ret = 0;
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av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
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if (write_trailer)
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ret = av_write_trailer(oc);
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if (ret < 0)
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av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
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oc->filename);
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if (seg->list) {
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if (seg->list_size && !(seg->segment_count % seg->list_size)) {
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segment_list_close(s);
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if ((ret = segment_list_open(s)) < 0)
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goto end;
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}
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if (seg->list_type == LIST_TYPE_FLAT) {
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avio_printf(seg->list_pb, "%s\n", oc->filename);
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} else if (seg->list_type == LIST_TYPE_CSV || seg->list_type == LIST_TYPE_EXT) {
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print_csv_escaped_str(seg->list_pb, oc->filename);
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avio_printf(seg->list_pb, ",%f,%f\n", seg->start_time, seg->end_time);
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} else if (seg->list_type == LIST_TYPE_M3U8) {
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avio_printf(seg->list_pb, "#EXTINF:%f,\n%s\n",
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seg->end_time - seg->start_time, oc->filename);
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}
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seg->list_max_segment_time = FFMAX(seg->end_time - seg->start_time, seg->list_max_segment_time);
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avio_flush(seg->list_pb);
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}
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end:
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avio_close(oc->pb);
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return ret;
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}
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static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
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const char *times_str)
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{
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char *p;
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int i, ret = 0;
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char *times_str1 = av_strdup(times_str);
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char *saveptr = NULL;
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if (!times_str1)
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return AVERROR(ENOMEM);
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#define FAIL(err) ret = err; goto end
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*nb_times = 1;
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for (p = times_str1; *p; p++)
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if (*p == ',')
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(*nb_times)++;
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*times = av_malloc(sizeof(**times) * *nb_times);
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if (!*times) {
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av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
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FAIL(AVERROR(ENOMEM));
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}
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p = times_str1;
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for (i = 0; i < *nb_times; i++) {
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int64_t t;
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char *tstr = av_strtok(p, ",", &saveptr);
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av_assert0(tstr);
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p = NULL;
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ret = av_parse_time(&t, tstr, 1);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Invalid time duration specification in %s\n", p);
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FAIL(AVERROR(EINVAL));
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}
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(*times)[i] = t;
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/* check on monotonicity */
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if (i && (*times)[i-1] > (*times)[i]) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Specified time %f is greater than the following time %f\n",
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(float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
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FAIL(AVERROR(EINVAL));
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}
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}
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end:
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av_free(times_str1);
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return ret;
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}
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static int open_null_ctx(AVIOContext **ctx)
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{
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int buf_size = 32768;
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uint8_t *buf = av_malloc(buf_size);
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if (!buf)
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return AVERROR(ENOMEM);
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*ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
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if (!*ctx) {
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av_free(buf);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static void close_null_ctx(AVIOContext *pb)
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{
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av_free(pb->buffer);
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av_free(pb);
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}
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static int seg_write_header(AVFormatContext *s)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = NULL;
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int ret, i;
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seg->segment_count = 0;
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if (!seg->write_header_trailer)
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seg->individual_header_trailer = 0;
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if (seg->time_str && seg->times_str) {
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av_log(s, AV_LOG_ERROR,
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"segment_time and segment_times options are mutually exclusive, select just one of them\n");
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return AVERROR(EINVAL);
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}
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if ((seg->list_flags & SEGMENT_LIST_FLAG_LIVE) && seg->times_str) {
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av_log(s, AV_LOG_ERROR,
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"segment_flags +live and segment_times options are mutually exclusive:"
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"specify -segment_time if you want a live-friendly list\n");
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return AVERROR(EINVAL);
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}
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if (seg->times_str) {
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if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
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return ret;
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} else {
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/* set default value if not specified */
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if (!seg->time_str)
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seg->time_str = av_strdup("2");
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if ((ret = av_parse_time(&seg->time, seg->time_str, 1)) < 0) {
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av_log(s, AV_LOG_ERROR,
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"Invalid time duration specification '%s' for segment_time option\n",
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seg->time_str);
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return ret;
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}
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}
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if (seg->time_delta_str) {
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if ((ret = av_parse_time(&seg->time_delta, seg->time_delta_str, 1)) < 0) {
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av_log(s, AV_LOG_ERROR,
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"Invalid time duration specification '%s' for delta option\n",
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seg->time_delta_str);
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return ret;
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}
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}
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if (seg->list) {
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if (seg->list_type == LIST_TYPE_UNDEFINED) {
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if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
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else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
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else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
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else seg->list_type = LIST_TYPE_FLAT;
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}
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if ((ret = segment_list_open(s)) < 0)
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goto fail;
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}
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if (seg->list_type == LIST_TYPE_EXT)
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av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
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for (i = 0; i < s->nb_streams; i++)
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seg->has_video +=
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(s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);
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if (seg->has_video > 1)
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av_log(s, AV_LOG_WARNING,
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"More than a single video stream present, "
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"expect issues decoding it.\n");
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seg->oformat = av_guess_format(seg->format, s->filename, NULL);
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if (!seg->oformat) {
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ret = AVERROR_MUXER_NOT_FOUND;
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goto fail;
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}
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if (seg->oformat->flags & AVFMT_NOFILE) {
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av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
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seg->oformat->name);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if ((ret = segment_mux_init(s)) < 0)
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goto fail;
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oc = seg->avf;
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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s->filename, seg->segment_idx) < 0) {
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ret = AVERROR(EINVAL);
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goto fail;
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}
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seg->segment_count++;
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if (seg->write_header_trailer) {
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if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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} else {
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if ((ret = open_null_ctx(&oc->pb)) < 0)
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goto fail;
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}
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if ((ret = avformat_write_header(oc, NULL)) < 0) {
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avio_close(oc->pb);
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goto fail;
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}
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if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
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s->avoid_negative_ts = 1;
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if (!seg->write_header_trailer) {
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close_null_ctx(oc->pb);
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if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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}
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fail:
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if (ret) {
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if (seg->list)
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segment_list_close(s);
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if (seg->avf)
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avformat_free_context(seg->avf);
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}
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return ret;
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}
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static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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SegmentContext *seg = s->priv_data;
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AVFormatContext *oc = seg->avf;
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AVStream *st = s->streams[pkt->stream_index];
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int64_t end_pts;
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int ret;
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if (seg->times) {
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end_pts = seg->segment_count <= seg->nb_times ?
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seg->times[seg->segment_count-1] : INT64_MAX;
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} else {
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end_pts = seg->time * seg->segment_count;
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}
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/* if the segment has video, start a new segment *only* with a key video frame */
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if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO || !seg->has_video) &&
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av_compare_ts(pkt->pts, st->time_base,
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end_pts-seg->time_delta, AV_TIME_BASE_Q) >= 0 &&
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pkt->flags & AV_PKT_FLAG_KEY) {
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av_log(s, AV_LOG_DEBUG, "Next segment starts with packet stream:%d pts:%"PRId64" pts_time:%f\n",
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pkt->stream_index, pkt->pts, pkt->pts * av_q2d(st->time_base));
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ret = segment_end(s, seg->individual_header_trailer);
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if (!ret)
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ret = segment_start(s, seg->individual_header_trailer);
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if (ret)
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goto fail;
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oc = seg->avf;
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seg->start_time = (double)pkt->pts * av_q2d(st->time_base);
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} else if (pkt->pts != AV_NOPTS_VALUE) {
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seg->end_time = FFMAX(seg->end_time,
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|
(double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
|
|
}
|
|
|
|
ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
|
|
|
|
fail:
|
|
if (ret < 0) {
|
|
if (seg->list)
|
|
avio_close(seg->list_pb);
|
|
avformat_free_context(oc);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int seg_write_trailer(struct AVFormatContext *s)
|
|
{
|
|
SegmentContext *seg = s->priv_data;
|
|
AVFormatContext *oc = seg->avf;
|
|
int ret;
|
|
if (!seg->write_header_trailer) {
|
|
if ((ret = segment_end(s, 0)) < 0)
|
|
goto fail;
|
|
open_null_ctx(&oc->pb);
|
|
ret = av_write_trailer(oc);
|
|
close_null_ctx(oc->pb);
|
|
} else {
|
|
ret = segment_end(s, 1);
|
|
}
|
|
fail:
|
|
if (seg->list)
|
|
segment_list_close(s);
|
|
|
|
av_opt_free(seg);
|
|
av_freep(&seg->times);
|
|
|
|
avformat_free_context(oc);
|
|
return ret;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(SegmentContext, x)
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{ "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
|
|
{ "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
|
|
|
|
{ "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},
|
|
{ "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
|
|
{ "live", "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX, E, "list_flags"},
|
|
|
|
{ "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
|
|
{ "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },
|
|
{ "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, 0, "list_type" },
|
|
{ "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, 0, "list_type" },
|
|
{ "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, 0, "list_type" },
|
|
{ "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, 0, "list_type" },
|
|
{ "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, 0, "list_type" },
|
|
{ "segment_time", "set segment duration", OFFSET(time_str),AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
|
|
{ "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta_str), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, E },
|
|
{ "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
|
|
{ "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
|
|
{ "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
|
|
{ "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass seg_class = {
|
|
.class_name = "segment muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVOutputFormat ff_segment_muxer = {
|
|
.name = "segment",
|
|
.long_name = NULL_IF_CONFIG_SMALL("segment"),
|
|
.priv_data_size = sizeof(SegmentContext),
|
|
.flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
|
|
.write_header = seg_write_header,
|
|
.write_packet = seg_write_packet,
|
|
.write_trailer = seg_write_trailer,
|
|
.priv_class = &seg_class,
|
|
};
|
|
|
|
static const AVClass sseg_class = {
|
|
.class_name = "stream_segment muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVOutputFormat ff_stream_segment_muxer = {
|
|
.name = "stream_segment,ssegment",
|
|
.long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
|
|
.priv_data_size = sizeof(SegmentContext),
|
|
.flags = AVFMT_NOFILE,
|
|
.write_header = seg_write_header,
|
|
.write_packet = seg_write_packet,
|
|
.write_trailer = seg_write_trailer,
|
|
.priv_class = &sseg_class,
|
|
};
|