mirror of https://git.ffmpeg.org/ffmpeg.git
639 lines
18 KiB
C
639 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 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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#include <float.h>
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#include <stdint.h>
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#include <config.h>
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#if CONFIG_OPENSSL
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#include <openssl/rand.h>
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#endif
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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/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/random_seed.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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typedef struct ListEntry {
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char name[1024];
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int64_t duration; // segment duration in AV_TIME_BASE units
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int discont;
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struct ListEntry *next;
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} ListEntry;
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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 size; // Set by a private option.
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int wrap; // Set by a private option.
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int version; // Set by a private option.
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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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// The following timestamps are in AV_TIME_BASE units.
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int64_t start_pts;
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int64_t end_pts;
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int64_t duration; // last segment duration computed so far.
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int nb_entries;
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ListEntry *list;
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ListEntry *end_list;
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char *basename;
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char *baseurl;
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int encrypt; // Set by a private option.
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char *key; // Set by a private option.
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int key_len;
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char *key_url; // Set by a private option.
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char *iv; // Set by a private option.
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int iv_len;
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int recovered;
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char *key_basename;
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AVDictionary *enc_opts;
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} HLSContext;
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static int randomize(uint8_t *buf, int len)
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{
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#if CONFIG_OPENSSL
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if (RAND_bytes(buf, len))
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return 0;
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return AVERROR(EIO);
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#else
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return AVERROR(ENOSYS);
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#endif
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}
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static void free_encryption(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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av_dict_free(&hls->enc_opts);
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av_freep(&hls->key_basename);
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}
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static int dict_set_bin(AVDictionary **dict, const char *key,
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uint8_t *buf, size_t len)
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{
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char hex[33];
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ff_data_to_hex(hex, buf, len, 0);
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hex[32] = '\0';
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return av_dict_set(dict, key, hex, 0);
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}
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static int setup_encryption(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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AVIOContext *out = NULL;
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int len, ret;
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uint8_t buf[16];
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uint8_t *k = NULL;
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len = strlen(hls->basename) + 4 + 1;
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hls->key_basename = av_mallocz(len);
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if (!hls->key_basename)
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return AVERROR(ENOMEM);
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av_strlcpy(hls->key_basename, hls->basename + 7, len);
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av_strlcat(hls->key_basename, ".key", len);
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if (hls->key) {
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if (hls->key_len != 16) {
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av_log(s, AV_LOG_ERROR,
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"Invalid key size %d, expected 16-bytes hex-coded key\n",
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hls->key_len);
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return AVERROR(EINVAL);
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}
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if ((ret = dict_set_bin(&hls->enc_opts, "key", hls->key, hls->key_len)) < 0)
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return ret;
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k = hls->key;
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} else {
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if (hls->start_sequence < 0) {
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ret = s->io_open(s, &out, hls->key_basename, AVIO_FLAG_READ, NULL);
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if (ret < 0) {
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av_log(s, AV_LOG_WARNING,
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"Cannot recover the key, generating a new one.\n");
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} else {
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avio_read(out, buf, 16);
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k = buf;
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avio_close(out);
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}
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}
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if (!k) {
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if ((ret = randomize(buf, sizeof(buf))) < 0) {
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av_log(s, AV_LOG_ERROR, "Cannot generate a strong random key\n");
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return ret;
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}
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}
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if ((ret = dict_set_bin(&hls->enc_opts, "key", buf, sizeof(buf))) < 0)
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return ret;
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k = buf;
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}
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if (hls->iv) {
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if (hls->iv_len != 16) {
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av_log(s, AV_LOG_ERROR,
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"Invalid key size %d, expected 16-bytes hex-coded initialization vector\n",
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hls->iv_len);
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return AVERROR(EINVAL);
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}
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if ((ret = dict_set_bin(&hls->enc_opts, "iv", hls->iv, hls->iv_len)) < 0)
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return ret;
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}
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if ((ret = s->io_open(s, &out, hls->key_basename, AVIO_FLAG_WRITE, NULL)) < 0)
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return ret;
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avio_write(out, k, 16);
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avio_close(out);
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return 0;
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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;
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hls->avf = oc = avformat_alloc_context();
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if (!oc)
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return AVERROR(ENOMEM);
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oc->oformat = hls->oformat;
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oc->interrupt_callback = s->interrupt_callback;
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oc->opaque = s->opaque;
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oc->io_open = s->io_open;
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oc->io_close = s->io_close;
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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_parameters_copy(st->codecpar, s->streams[i]->codecpar);
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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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return 0;
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}
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static int append_entry(HLSContext *hls, int64_t duration, const char *name,
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int discont)
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{
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ListEntry *en = av_malloc(sizeof(*en));
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if (!en)
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return AVERROR(ENOMEM);
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av_strlcpy(en->name, name, sizeof(en->name));
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en->discont = discont;
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en->duration = duration;
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en->next = NULL;
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if (!hls->list)
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hls->list = en;
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else
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hls->end_list->next = en;
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hls->end_list = en;
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if (hls->nb_entries >= hls->size) {
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en = hls->list;
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hls->list = en->next;
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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 free_entries(HLSContext *hls)
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{
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ListEntry *p = hls->list, *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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ListEntry *en;
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int64_t 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->size);
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snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
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if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL)) < 0)
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goto fail;
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for (en = hls->list; en; en = en->next) {
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if (target_duration < en->duration)
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target_duration = en->duration;
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}
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avio_printf(out, "#EXTM3U\n");
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avio_printf(out, "#EXT-X-VERSION:%d\n", hls->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:%"PRId64"\n",
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av_rescale_rnd(target_duration, 1, AV_TIME_BASE,
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AV_ROUND_UP));
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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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for (en = hls->list; en; en = en->next) {
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if (en->discont) {
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avio_printf(out, "#EXT-X-DISCONTINUITY\n");
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}
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if (hls->encrypt) {
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char *key_url;
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if (hls->key_url)
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key_url = hls->key_url;
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else
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key_url = hls->baseurl;
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avio_printf(out, "#EXT-X-KEY:METHOD=AES-128");
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avio_printf(out, ",URI=\"");
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if (key_url)
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avio_printf(out, "%s", key_url);
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avio_printf(out, "%s\"", av_basename(hls->key_basename));
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if (hls->iv)
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avio_printf(out, ",IV=\"0x%s\"", hls->iv);
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avio_printf(out, "\n");
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}
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if (hls->version > 2)
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avio_printf(out, "#EXTINF:%f\n",
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(double)en->duration / AV_TIME_BASE);
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else
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avio_printf(out, "#EXTINF:%"PRId64",\n",
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av_rescale(en->duration, 1, AV_TIME_BASE));
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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->name);
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}
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if (last)
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avio_printf(out, "#EXT-X-ENDLIST\n");
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fail:
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ff_format_io_close(s, &out);
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if (ret >= 0)
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ff_rename(temp_filename, s->filename);
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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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AVDictionary *opts = NULL;
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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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return AVERROR(EINVAL);
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c->number++;
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if (c->encrypt) {
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if ((err = av_dict_copy(&opts, c->enc_opts, 0)) < 0)
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return err;
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if (!c->iv) {
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uint8_t iv[16] = { 0 };
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char buf[33];
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AV_WB64(iv + 8, c->sequence);
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ff_data_to_hex(buf, iv, sizeof(iv), 0);
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buf[32] = '\0';
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if ((err = av_dict_set(&opts, "iv", buf, 0)) < 0)
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goto fail;
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}
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}
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if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, &opts)) < 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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fail:
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av_dict_free(&opts);
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return err;
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}
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static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
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{
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int len = ff_get_line(s, buf, maxlen);
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while (len > 0 && av_isspace(buf[len - 1]))
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buf[--len] = '\0';
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return len;
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}
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static int hls_recover(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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char line[1024];
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AVIOContext *io;
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const char *ptr;
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int ret, is_segment = 0, is_discont = 0;
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int64_t duration = 0;
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ret = s->io_open(s, &io, s->filename, AVIO_FLAG_READ, NULL);
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if (ret < 0) {
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av_log(s, AV_LOG_WARNING,
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"Cannot recover the playlist, generating a new one.\n");
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hls->start_sequence = 0;
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hls->sequence = 0;
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return 0;
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}
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read_chomp_line(io, line, sizeof(line));
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if (strcmp(line, "#EXTM3U")) {
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av_log(s, AV_LOG_ERROR,
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"The playlist file is present but unparsable."
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" Please remove it.\n");
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return AVERROR_INVALIDDATA;
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}
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while (!io->eof_reached) {
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read_chomp_line(io, line, sizeof(line));
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if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
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hls->sequence = hls->start_sequence = atoi(ptr);
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} else if (av_strstart(line, "#EXTINF:", &ptr)) {
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is_segment = 1;
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duration = atof(ptr) * AV_TIME_BASE;
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} else if (av_strstart(line, "#EXT-X-DISCONTINUITY", NULL)) {
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is_discont = 1;
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} else if (av_strstart(line, "#", NULL)) {
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continue;
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} else if (line[0]) {
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if (is_segment) {
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append_entry(hls, duration, av_basename(line), is_discont);
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is_segment = 0;
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is_discont = 0;
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}
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}
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}
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hls->recovered = 1;
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return 0;
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}
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static int hls_setup(AVFormatContext *s)
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{
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HLSContext *hls = s->priv_data;
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const char *pattern = "%d.ts";
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int basename_size = strlen(s->filename) + strlen(pattern) + 1;
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char *p;
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int ret;
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if (hls->encrypt)
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basename_size += 7;
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hls->basename = av_mallocz(basename_size);
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if (!hls->basename)
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return AVERROR(ENOMEM);
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// TODO: support protocol nesting?
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if (hls->encrypt)
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strcpy(hls->basename, "crypto:");
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av_strlcat(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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if (hls->encrypt) {
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ret = setup_encryption(s);
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if (ret < 0)
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return ret;
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}
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if (hls->start_sequence < 0) {
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ret = hls_recover(s);
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if (ret < 0)
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return ret;
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}
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av_strlcat(hls->basename, pattern, basename_size);
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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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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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for (i = 0; i < s->nb_streams; i++)
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hls->has_video +=
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s->streams[i]->codecpar->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 ((ret = hls_setup(s)) < 0)
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goto fail;
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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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if ((ret = avformat_write_header(hls->avf, NULL)) < 0)
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return ret;
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fail:
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if (ret) {
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av_free(hls->basename);
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if (hls->avf)
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avformat_free_context(hls->avf);
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free_encryption(s);
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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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int64_t pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
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int ret, can_split = 1;
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|
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if (hls->start_pts == AV_NOPTS_VALUE) {
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hls->start_pts = pts;
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hls->end_pts = pts;
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}
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|
|
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if (hls->has_video) {
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can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
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pkt->flags & AV_PKT_FLAG_KEY;
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}
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if (pkt->pts == AV_NOPTS_VALUE)
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can_split = 0;
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else
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hls->duration = pts - hls->end_pts;
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|
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if (can_split && pts - hls->start_pts >= end_pts) {
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ret = append_entry(hls, hls->duration, av_basename(hls->avf->filename), hls->recovered);
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hls->recovered = 0;
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if (ret)
|
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return ret;
|
|
|
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hls->end_pts = pts;
|
|
hls->duration = 0;
|
|
|
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av_write_frame(oc, NULL); /* Flush any buffered data */
|
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ff_format_io_close(s, &oc->pb);
|
|
|
|
ret = hls_start(s);
|
|
|
|
if (ret)
|
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return ret;
|
|
|
|
oc = hls->avf;
|
|
|
|
if ((ret = hls_window(s, 0)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int hls_write_trailer(struct AVFormatContext *s)
|
|
{
|
|
HLSContext *hls = s->priv_data;
|
|
AVFormatContext *oc = hls->avf;
|
|
|
|
av_write_trailer(oc);
|
|
ff_format_io_close(s, &oc->pb);
|
|
avformat_free_context(oc);
|
|
av_free(hls->basename);
|
|
append_entry(hls, hls->duration, av_basename(hls->avf->filename), 0);
|
|
hls_window(s, 1);
|
|
|
|
free_entries(hls);
|
|
free_encryption(s);
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(HLSContext, x)
|
|
#define E AV_OPT_FLAG_ENCODING_PARAM
|
|
static const AVOption options[] = {
|
|
{"start_number", "first number in the sequence", OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, -1, INT64_MAX, E, "start_number"},
|
|
{"recover", "If there is already a m3u8 file in the path, populate the sequence from it", 0, AV_OPT_TYPE_CONST, {.i64 = -1}, 0, 0, E, "start_number"},
|
|
{"hls_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
|
|
{"hls_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E},
|
|
{"hls_wrap", "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_version", "protocol version", OFFSET(version), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, E},
|
|
{"hls_enc", "AES128 encryption support", OFFSET(encrypt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E},
|
|
{"hls_enc_key", "use the specified hex-coded 16byte key to encrypt the segments", OFFSET(key), AV_OPT_TYPE_BINARY, .flags = E},
|
|
{"hls_enc_key_url", "url to access the key to decrypt the segments", OFFSET(key_url), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
|
|
{"hls_enc_iv", "use the specified hex-coded 16byte initialization vector", OFFSET(iv), AV_OPT_TYPE_BINARY, .flags = E},
|
|
{ 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,
|
|
};
|