mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 16:25:04 +02:00
554 lines
18 KiB
C
554 lines
18 KiB
C
/*
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* Apple HTTP Live Streaming segmenter
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* Copyright (c) 2012, Luca Barbato
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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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#include <float.h>
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#include <stdint.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/mathematics.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/log.h"
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#include "avformat.h"
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#include "internal.h"
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#include "os_support.h"
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typedef struct HLSSegment {
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char filename[1024];
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double duration; /* in seconds */
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int64_t pos;
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int64_t size;
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struct HLSSegment *next;
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} HLSSegment;
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typedef enum HLSFlags {
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// Generate a single media file and use byte ranges in the playlist.
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HLS_SINGLE_FILE = (1 << 0),
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HLS_DELETE_SEGMENTS = (1 << 1),
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HLS_ROUND_DURATIONS = (1 << 2),
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HLS_DISCONT_START = (1 << 3),
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HLS_OMIT_ENDLIST = (1 << 4),
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} HLSFlags;
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typedef struct HLSContext {
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const AVClass *class; // Class for private options.
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unsigned number;
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int64_t sequence;
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int64_t start_sequence;
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AVOutputFormat *oformat;
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AVFormatContext *avf;
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float time; // Set by a private option.
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int max_nb_segments; // Set by a private option.
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int wrap; // Set by a private option.
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uint32_t flags; // enum HLSFlags
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char *segment_filename;
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int allowcache;
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int64_t recording_time;
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int has_video;
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int64_t start_pts;
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int64_t end_pts;
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double duration; // last segment duration computed so far, in seconds
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int64_t start_pos; // last segment starting position
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int64_t size; // last segment size
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int nb_entries;
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int discontinuity_set;
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HLSSegment *segments;
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HLSSegment *last_segment;
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HLSSegment *old_segments;
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char *basename;
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char *baseurl;
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char *format_options_str;
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AVDictionary *format_options;
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} HLSContext;
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static int hls_delete_old_segments(HLSContext *hls) {
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HLSSegment *segment, *previous_segment = NULL;
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float playlist_duration = 0.0f;
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int ret = 0, path_size;
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char *dirname = NULL, *p, *path;
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segment = hls->segments;
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while (segment) {
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playlist_duration += segment->duration;
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segment = segment->next;
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}
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segment = hls->old_segments;
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while (segment) {
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playlist_duration -= segment->duration;
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previous_segment = segment;
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segment = previous_segment->next;
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if (playlist_duration <= -previous_segment->duration) {
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previous_segment->next = NULL;
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break;
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}
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}
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if (segment) {
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if (hls->segment_filename) {
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dirname = av_strdup(hls->segment_filename);
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} else {
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dirname = av_strdup(hls->avf->filename);
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}
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if (!dirname) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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p = (char *)av_basename(dirname);
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*p = '\0';
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}
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while (segment) {
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av_log(hls, AV_LOG_DEBUG, "deleting old segment %s\n",
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segment->filename);
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path_size = strlen(dirname) + strlen(segment->filename) + 1;
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path = av_malloc(path_size);
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if (!path) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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av_strlcpy(path, dirname, path_size);
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av_strlcat(path, segment->filename, path_size);
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if (unlink(path) < 0) {
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av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
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path, strerror(errno));
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}
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av_free(path);
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previous_segment = segment;
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segment = previous_segment->next;
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av_free(previous_segment);
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}
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fail:
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av_free(dirname);
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return ret;
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}
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static int hls_mux_init(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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AVFormatContext *oc;
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int i, ret;
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ret = avformat_alloc_output_context2(&hls->avf, hls->oformat, NULL, NULL);
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if (ret < 0)
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return ret;
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oc = hls->avf;
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oc->oformat = hls->oformat;
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oc->interrupt_callback = s->interrupt_callback;
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oc->max_delay = s->max_delay;
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av_dict_copy(&oc->metadata, s->metadata, 0);
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st;
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if (!(st = avformat_new_stream(oc, NULL)))
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return AVERROR(ENOMEM);
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avcodec_copy_context(st->codec, s->streams[i]->codec);
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st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
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st->time_base = s->streams[i]->time_base;
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}
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hls->start_pos = 0;
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return 0;
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}
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/* Create a new segment and append it to the segment list */
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static int hls_append_segment(HLSContext *hls, double duration, int64_t pos,
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int64_t size)
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{
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HLSSegment *en = av_malloc(sizeof(*en));
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int ret;
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if (!en)
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return AVERROR(ENOMEM);
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av_strlcpy(en->filename, av_basename(hls->avf->filename), sizeof(en->filename));
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en->duration = duration;
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en->pos = pos;
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en->size = size;
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en->next = NULL;
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if (!hls->segments)
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hls->segments = en;
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else
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hls->last_segment->next = en;
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hls->last_segment = en;
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if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {
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en = hls->segments;
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hls->segments = en->next;
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if (en && hls->flags & HLS_DELETE_SEGMENTS &&
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!(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
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en->next = hls->old_segments;
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hls->old_segments = en;
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if ((ret = hls_delete_old_segments(hls)) < 0)
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return ret;
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} else
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av_free(en);
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} else
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hls->nb_entries++;
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hls->sequence++;
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return 0;
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}
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static void hls_free_segments(HLSSegment *p)
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{
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HLSSegment *en;
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while(p) {
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en = p;
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p = p->next;
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av_free(en);
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}
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}
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static int hls_window(AVFormatContext *s, int last)
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{
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HLSContext *hls = s->priv_data;
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HLSSegment *en;
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int target_duration = 0;
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int ret = 0;
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AVIOContext *out = NULL;
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char temp_filename[1024];
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int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);
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int version = hls->flags & HLS_SINGLE_FILE ? 4 : 3;
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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 warned_non_file;
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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 temporarly partial files\n");
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snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
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if ((ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE,
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&s->interrupt_callback, NULL)) < 0)
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goto fail;
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for (en = hls->segments; en; en = en->next) {
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if (target_duration < en->duration)
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target_duration = ceil(en->duration);
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}
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hls->discontinuity_set = 0;
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avio_printf(out, "#EXTM3U\n");
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avio_printf(out, "#EXT-X-VERSION:%d\n", version);
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if (hls->allowcache == 0 || hls->allowcache == 1) {
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avio_printf(out, "#EXT-X-ALLOW-CACHE:%s\n", hls->allowcache == 0 ? "NO" : "YES");
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}
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avio_printf(out, "#EXT-X-TARGETDURATION:%d\n", target_duration);
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avio_printf(out, "#EXT-X-MEDIA-SEQUENCE:%"PRId64"\n", sequence);
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av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%"PRId64"\n",
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sequence);
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if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && hls->discontinuity_set==0 ){
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avio_printf(out, "#EXT-X-DISCONTINUITY\n");
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hls->discontinuity_set = 1;
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}
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for (en = hls->segments; en; en = en->next) {
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if (hls->flags & HLS_ROUND_DURATIONS)
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avio_printf(out, "#EXTINF:%d,\n", (int)round(en->duration));
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else
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avio_printf(out, "#EXTINF:%f,\n", en->duration);
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if (hls->flags & HLS_SINGLE_FILE)
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avio_printf(out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
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en->size, en->pos);
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if (hls->baseurl)
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avio_printf(out, "%s", hls->baseurl);
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avio_printf(out, "%s\n", en->filename);
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}
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if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)
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avio_printf(out, "#EXT-X-ENDLIST\n");
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fail:
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avio_closep(&out);
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if (ret >= 0 && use_rename)
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ff_rename(temp_filename, s->filename, s);
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return ret;
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}
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static int hls_start(AVFormatContext *s)
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{
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HLSContext *c = s->priv_data;
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AVFormatContext *oc = c->avf;
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int err = 0;
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if (c->flags & HLS_SINGLE_FILE)
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av_strlcpy(oc->filename, c->basename,
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sizeof(oc->filename));
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else
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if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
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c->basename, c->wrap ? c->sequence % c->wrap : c->sequence) < 0) {
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av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->basename);
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return AVERROR(EINVAL);
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}
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c->number++;
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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, "mpegts_flags", "resend_headers", 0);
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return 0;
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}
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static int hls_write_header(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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int ret, i;
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char *p;
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const char *pattern = "%d.ts";
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AVDictionary *options = NULL;
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int basename_size;
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hls->sequence = hls->start_sequence;
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hls->recording_time = hls->time * AV_TIME_BASE;
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hls->start_pts = AV_NOPTS_VALUE;
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if (hls->format_options_str) {
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ret = av_dict_parse_string(&hls->format_options, hls->format_options_str, "=", ":", 0);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Could not parse format options list '%s'\n", hls->format_options_str);
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goto fail;
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}
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}
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for (i = 0; i < s->nb_streams; i++)
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hls->has_video +=
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s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO;
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if (hls->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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hls->oformat = av_guess_format("mpegts", NULL, NULL);
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if (!hls->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 (hls->segment_filename) {
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hls->basename = av_strdup(hls->segment_filename);
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if (!hls->basename) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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} else {
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if (hls->flags & HLS_SINGLE_FILE)
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pattern = ".ts";
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basename_size = strlen(s->filename) + strlen(pattern) + 1;
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hls->basename = av_malloc(basename_size);
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if (!hls->basename) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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av_strlcpy(hls->basename, s->filename, basename_size);
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p = strrchr(hls->basename, '.');
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if (p)
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*p = '\0';
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av_strlcat(hls->basename, pattern, basename_size);
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}
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if ((ret = hls_mux_init(s)) < 0)
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goto fail;
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if ((ret = hls_start(s)) < 0)
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goto fail;
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av_dict_copy(&options, hls->format_options, 0);
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ret = avformat_write_header(hls->avf, &options);
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if (av_dict_count(options)) {
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av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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av_assert0(s->nb_streams == hls->avf->nb_streams);
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *inner_st = hls->avf->streams[i];
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AVStream *outer_st = s->streams[i];
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avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
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}
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fail:
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av_dict_free(&options);
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if (ret < 0) {
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av_freep(&hls->basename);
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if (hls->avf)
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avformat_free_context(hls->avf);
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}
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return ret;
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}
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static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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HLSContext *hls = s->priv_data;
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AVFormatContext *oc = hls->avf;
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AVStream *st = s->streams[pkt->stream_index];
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int64_t end_pts = hls->recording_time * hls->number;
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int is_ref_pkt = 1;
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int ret, can_split = 1;
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if (hls->start_pts == AV_NOPTS_VALUE) {
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hls->start_pts = pkt->pts;
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hls->end_pts = pkt->pts;
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}
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if (hls->has_video) {
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can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
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pkt->flags & AV_PKT_FLAG_KEY;
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is_ref_pkt = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
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}
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if (pkt->pts == AV_NOPTS_VALUE)
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is_ref_pkt = can_split = 0;
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if (is_ref_pkt)
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hls->duration = (double)(pkt->pts - hls->end_pts)
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* st->time_base.num / st->time_base.den;
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if (can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
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end_pts, AV_TIME_BASE_Q) >= 0) {
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int64_t new_start_pos;
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av_write_frame(oc, NULL); /* Flush any buffered data */
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new_start_pos = avio_tell(hls->avf->pb);
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hls->size = new_start_pos - hls->start_pos;
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ret = hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
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hls->start_pos = new_start_pos;
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if (ret < 0)
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return ret;
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hls->end_pts = pkt->pts;
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hls->duration = 0;
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if (hls->flags & HLS_SINGLE_FILE) {
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if (hls->avf->oformat->priv_class && hls->avf->priv_data)
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av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
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hls->number++;
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} else {
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avio_closep(&oc->pb);
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ret = hls_start(s);
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}
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if (ret < 0)
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return ret;
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oc = hls->avf;
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if ((ret = hls_window(s, 0)) < 0)
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return ret;
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}
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ret = ff_write_chained(oc, pkt->stream_index, pkt, s, 0);
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return ret;
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}
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static int hls_write_trailer(struct AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
|
|
AVFormatContext *oc = hls->avf;
|
|
|
|
av_write_trailer(oc);
|
|
if (oc->pb) {
|
|
hls->size = avio_tell(hls->avf->pb) - hls->start_pos;
|
|
avio_closep(&oc->pb);
|
|
hls_append_segment(hls, hls->duration, hls->start_pos, hls->size);
|
|
}
|
|
av_freep(&hls->basename);
|
|
avformat_free_context(oc);
|
|
hls->avf = NULL;
|
|
hls_window(s, 1);
|
|
|
|
hls_free_segments(hls->segments);
|
|
hls_free_segments(hls->old_segments);
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(HLSContext, x)
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{"start_number", "set first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, E},
|
|
{"hls_time", "set segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
|
|
{"hls_list_size", "set maximum number of playlist entries", OFFSET(max_nb_segments), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
|
|
{"hls_ts_options","set hls mpegts list of options for the container format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
|
|
{"hls_wrap", "set number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E},
|
|
{"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
|
|
{"hls_base_url", "url to prepend to each playlist entry", OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
|
|
{"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
|
|
{"hls_flags", "set flags affecting HLS playlist and media file generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E, "flags"},
|
|
{"single_file", "generate a single media file indexed with byte ranges", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SINGLE_FILE }, 0, UINT_MAX, E, "flags"},
|
|
{"delete_segments", "delete segment files that are no longer part of the playlist", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DELETE_SEGMENTS }, 0, UINT_MAX, E, "flags"},
|
|
{"round_durations", "round durations in m3u8 to whole numbers", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX, E, "flags"},
|
|
{"discont_start", "start the playlist with a discontinuity tag", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX, E, "flags"},
|
|
{"omit_endlist", "Do not append an endlist when ending stream", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_OMIT_ENDLIST }, 0, UINT_MAX, E, "flags"},
|
|
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass hls_class = {
|
|
.class_name = "hls muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
|
|
AVOutputFormat ff_hls_muxer = {
|
|
.name = "hls",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
|
|
.extensions = "m3u8",
|
|
.priv_data_size = sizeof(HLSContext),
|
|
.audio_codec = AV_CODEC_ID_AAC,
|
|
.video_codec = AV_CODEC_ID_H264,
|
|
.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
|
|
.write_header = hls_write_header,
|
|
.write_packet = hls_write_packet,
|
|
.write_trailer = hls_write_trailer,
|
|
.priv_class = &hls_class,
|
|
};
|