@@ -321,6 +321,9 @@ available in a metadata key named "variant_bitrate".
It accepts the following options:
@table @option
+@item abr
+enable abr to switch streams.
+
@item live_start_index
segment index to start live streams at (negative values are from the end).
@@ -47,6 +47,7 @@
#define MPEG_TIME_BASE 90000
#define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
+#define ABR_THROUGHPUT_FIFO_LEN 20
/*
* An apple http stream consists of a playlist with media segment files,
* played sequentially. There may be several playlists with the same
@@ -65,6 +66,13 @@ enum KeyType {
KEY_SAMPLE_AES
};
+enum SwitchType {
+ SWITCH_VIDEO,
+ SWITCH_AUDIO,
+ SWITCH_VIDEO_AUDIO,
+ SWITCH_TYPES
+};
+
struct segment {
int64_t duration;
int64_t url_offset;
@@ -189,6 +197,26 @@ struct variant {
char subtitles_group[MAX_FIELD_LEN];
};
+struct throughput {
+ int n_throughputs;
+
+ /* throughputs are in kbps */
+ float throughput_fifo[ABR_THROUGHPUT_FIFO_LEN];
+ int head;
+ int tail;
+};
+
+struct switch_task {
+ enum SwitchType type;
+ int64_t switch_timestamp;
+};
+
+struct switch_info {
+ int pls_index;
+ int64_t first_timestamp;
+ int64_t delta_timestamp;
+};
+
typedef struct HLSContext {
AVClass *class;
AVFormatContext *ctx;
@@ -213,8 +241,58 @@ typedef struct HLSContext {
int http_multiple;
int http_seekable;
AVIOContext *playlist_pb;
+
+ int abr;
+ struct throughput *throughputs;
+ struct switch_task *switch_tasks;
+ struct switch_info *switch_info;
+ int switch_inited;
+ int can_switch;
+ int switch_request;
+ int switch_step;
+ int cur_var;
} HLSContext;
+static struct segment *next_segment(struct playlist *pls);
+static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in);
+static int select_cur_seq_no(HLSContext *c, struct playlist *pls);
+static AVRational get_timebase(struct playlist *pls);
+
+static struct segment *next2_segment(struct playlist *pls)
+{
+ int n = pls->cur_seq_no - pls->start_seq_no + 2;
+ if (n >= pls->n_segments)
+ return NULL;
+ return pls->segments[n];
+}
+
+static int playlist_type_full(struct playlist *pls)
+{
+ if (pls->n_main_streams == 1) {
+ return (enum SwitchType)pls->main_streams[0]->codecpar->codec_type;
+ } else {
+ return SWITCH_VIDEO_AUDIO;
+ }
+}
+
+static int playlist_type_simple(struct playlist *pls)
+{
+ int type = playlist_type_full(pls);
+ if (type == SWITCH_VIDEO_AUDIO)
+ type = SWITCH_VIDEO;
+ return type;
+}
+
+static int is_pls_switch_to(HLSContext *c, int index) {
+ if (c->switch_request == -1)
+ return 0;
+ for (int i = 0; i < c->variants[c->switch_request]->n_playlists; i++) {
+ if (c->variants[c->switch_request]->playlists[i]->index == index)
+ return 1;
+ }
+ return 0;
+}
+
static void free_segment_dynarray(struct segment **segments, int n_segments)
{
int i;
@@ -616,6 +694,38 @@ static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
#endif
}
+static int update_throughputs(struct throughput *thr, float time, int pb_size)
+{
+ if (pb_size <= 0 || time <= 0)
+ return AVERROR(EINVAL);
+ if (thr->n_throughputs < ABR_THROUGHPUT_FIFO_LEN) {
+ ++thr->n_throughputs;
+ } else {
+ thr->head = (thr->head + 1) % ABR_THROUGHPUT_FIFO_LEN;
+ }
+ thr->throughput_fifo[thr->tail] = (float)(pb_size) / time;
+ thr->tail = (thr->tail + 1) % ABR_THROUGHPUT_FIFO_LEN;
+ return 0;
+}
+
+static int64_t get_switch_timestamp(HLSContext *c, struct playlist *pls)
+{
+ int64_t first_timestamp, pos;
+ int type;
+ int n = pls->cur_seq_no + c->switch_step;
+ if (n >= pls->n_segments)
+ return -1;
+
+ type = playlist_type_simple(pls);
+ first_timestamp = c->switch_info[type].first_timestamp;
+ pos = first_timestamp == AV_NOPTS_VALUE ? 0 : first_timestamp;
+
+ for (int i = 0; i < n; i++) {
+ pos += pls->segments[i]->duration;
+ }
+ return pos;
+}
+
static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
{
@@ -631,6 +741,9 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
} else if (av_strstart(url, "data", NULL)) {
if (url[4] == '+' || url[4] == ':')
proto_name = avio_find_protocol_name(url + 5);
+ } else if (av_strstart(url, "ffabr", NULL)) {
+ if (url[5] == '+' || url[5] == ':')
+ proto_name = avio_find_protocol_name(url + 6);
}
if (!proto_name)
@@ -661,6 +774,8 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
;
else if (av_strstart(url, "data", NULL) && !strncmp(proto_name, url + 5, strlen(proto_name)) && url[5 + strlen(proto_name)] == ':')
;
+ else if (av_strstart(url, "ffabr", NULL) && !strncmp(proto_name, url + 6, strlen(proto_name)) && url[6 + strlen(proto_name)] == ':')
+ ;
else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
return AVERROR_INVALIDDATA;
@@ -682,6 +797,69 @@ static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
} else {
ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
}
+ if (c->abr && ret >= 0) {
+ AVDictionary *abr_ret = NULL;
+ AVDictionaryEntry *en = NULL;
+ struct segment *seg;
+ int pb_size, switch_request;
+ enum SwitchType type;
+ av_opt_get_dict_val(*pb, "abr-metadata", AV_OPT_SEARCH_CHILDREN, &abr_ret);
+ if (abr_ret) {
+ en = av_dict_get(abr_ret, "download_time", NULL, 0);
+ if (en) {
+ pb_size = avio_size(*pb);
+ update_throughputs(c->throughputs, strtol(en->value, NULL, 10) / 1000.0, pb_size);
+ av_log(s, AV_LOG_VERBOSE, "[abr] time=%.2fms, size=%.2fkb\n",
+ strtol(en->value, NULL, 10) / 1000.0, pb_size / 1000.0);
+ }
+ en = av_dict_get(abr_ret, "switch_request", NULL, 0);
+ if (en) {
+ switch_request = strtol(en->value, NULL, 10);
+ if (switch_request != -1)
+ av_log(s, AV_LOG_INFO, "[abr] switch request: %s\n", en->value);
+ }
+ en = av_dict_get(abr_ret, "type", NULL, 0);
+ if (en) {
+ type = strtol(en->value, NULL, 10);
+ }
+ if (switch_request != -1) {
+ struct variant *var = c->variants[switch_request];
+ c->switch_request = switch_request;
+ c->can_switch = 0;
+ for (int i = 0; i < var->n_playlists; i++) {
+ struct playlist *pls = var->playlists[i];
+ int64_t switch_timestamp;
+ pls->cur_seq_no = select_cur_seq_no(c, pls);
+ // if pls has same type to the segment just downloaded, switch should be delayed
+ if (type == SWITCH_VIDEO_AUDIO || playlist_type_full(pls) == type) {
+ pls->cur_seq_no++;
+ }
+ if (c->switch_step == 2) {
+ seg = next2_segment(pls);
+ } else {
+ seg = next_segment(pls);
+ }
+ switch_timestamp = get_switch_timestamp(c, pls);
+ if (!seg || switch_timestamp == -1) {
+ c->switch_request = -1;
+ av_log(s, AV_LOG_INFO, "[abr] no more segment need to switch\n");
+ } else {
+ int ptype;
+ ptype = playlist_type_simple(pls);
+ c->switch_tasks[pls->index].type = ptype;
+ c->switch_tasks[pls->index].switch_timestamp = switch_timestamp - c->switch_info[ptype].delta_timestamp * 1.5;
+ av_log(s, AV_LOG_INFO, "[abr] pls%d, switch type: %d timestamp: %ld\n",
+ pls->index, c->switch_tasks[pls->index].type, c->switch_tasks[pls->index].switch_timestamp);
+ if (c->switch_step == 2) {
+ pls->input_next_requested = 1;
+ ret = open_input(c, pls, seg, &pls->input_next);
+ }
+ }
+ }
+ }
+ av_dict_free(&abr_ret);
+ }
+ }
if (ret >= 0) {
// update cookies on http response with setcookies.
char *new_cookies = NULL;
@@ -1211,6 +1389,38 @@ static void intercept_id3(struct playlist *pls, uint8_t *buf,
pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
}
+static int abrinfo_to_dict(HLSContext *c, enum SwitchType type, char **abr_info)
+{
+ struct throughput *thr = c->throughputs;
+ char buffer[MAX_URL_SIZE];
+ int size, i, j;
+ size = snprintf(buffer, sizeof(buffer), "format=hls:");
+ size += snprintf(buffer + size, sizeof(buffer) - size, "cur_var=%d:", c->cur_var);
+ size += snprintf(buffer + size, sizeof(buffer) - size, "type=%d:", type);
+ size += snprintf(buffer + size, sizeof(buffer) - size, "can_switch=%d:", c->can_switch);
+ size += snprintf(buffer + size, sizeof(buffer) - size, "n_variants=%d:", c->n_variants);
+ for (i = 0; i < c->n_variants; i++) {
+ struct variant *v = c->variants[i];
+ size += snprintf(buffer + size, sizeof(buffer) - size, "variant_bitrate%d=%d:", i, v->bandwidth);
+ }
+ size += snprintf(buffer + size, sizeof(buffer) - size, "n_throughputs=%d:", thr->n_throughputs);
+ if (thr->n_throughputs > 0) {
+ i = thr->head;
+ j = 0;
+ do {
+ size += snprintf(buffer + size, sizeof(buffer) - size, "throughputs%d=%.2f:", j, thr->throughput_fifo[i]);
+ j++;
+ i = (i + 1) % ABR_THROUGHPUT_FIFO_LEN;
+ } while (i != thr->tail);
+ }
+ *abr_info = av_malloc(size);
+ if (!abr_info)
+ return AVERROR(ENOMEM);
+ snprintf(*abr_info, size, "%s", buffer);
+ av_log(c, AV_LOG_VERBOSE, "[abr] abr_info: %s\n", *abr_info);
+ return 0;
+}
+
static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
{
AVDictionary *opts = NULL;
@@ -1230,8 +1440,20 @@ static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg,
av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
seg->url, seg->url_offset, pls->index);
+ if (c->abr) {
+ char *abr_opts;
+ abrinfo_to_dict(c, playlist_type_full(pls), &abr_opts);
+ av_dict_set(&opts, "abr-params", abr_opts, 0);
+ av_free(abr_opts);
+ }
if (seg->key_type == KEY_NONE) {
- ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
+ char url_abr[MAX_URL_SIZE];
+ if (c->abr) {
+ snprintf(url_abr, sizeof(url_abr), "ffabr:%s", seg->url); // + or : tbd
+ ret = open_url(pls->parent, in, url_abr, c->avio_opts, opts, &is_http);
+ } else {
+ ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
+ }
} else if (seg->key_type == KEY_AES_128) {
char iv[33], key[33], url[MAX_URL_SIZE];
if (strcmp(seg->key, pls->key_url)) {
@@ -1427,7 +1649,15 @@ restart:
/* Check that the playlist is still needed before opening a new
* segment. */
v->needed = playlist_needed(v);
-
+ if (c->abr) {
+ if (c->switch_request == -1)
+ ;
+ else if (v->needed && !is_pls_switch_to(c, v->index) && !v->input_next_requested) {
+ av_log(v->parent, AV_LOG_VERBOSE, "read_data: needed but not download playlist %d ('%s')\n",
+ v->index, v->url);
+ return AVERROR_EOF;
+ }
+ }
if (!v->needed) {
av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d ('%s')\n",
v->index, v->url);
@@ -1517,12 +1747,22 @@ reload:
int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
if (r >= 0) {
c->http_multiple = (!strncmp((const char *)http_version_opt, "1.1", 3) || !strncmp((const char *)http_version_opt, "2.0", 3));
+ c->switch_step = c->http_multiple + 1;
av_freep(&http_version_opt);
+ } else {
+ c->switch_step = 1;
}
+ } else {
+ c->switch_step = c->http_multiple + 1;
}
seg = next_segment(v);
- if (c->http_multiple == 1 && !v->input_next_requested &&
+
+ // when get switch_request, old stream should stop downloading next seg
+ if (c->abr && c->switch_inited && c->switch_request != -1 && c->http_multiple == 1 && !is_pls_switch_to(c, v->index)
+ && ((c->cur_timestamp + seg->duration * c->switch_step) >= c->switch_tasks[v->index].switch_timestamp))
+ av_log(v->parent, AV_LOG_VERBOSE, "old playlist %d should stop downloading next seg\n", v->index);
+ else if (c->http_multiple == 1 && !v->input_next_requested &&
seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
ret = open_input(c, v, seg, &v->input_next);
if (ret < 0) {
@@ -1555,7 +1795,7 @@ reload:
return ret;
}
- if (c->http_persistent &&
+ if (c->http_persistent && !c->abr &&
seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
v->input_read_done = 1;
} else {
@@ -1833,7 +2073,11 @@ static int hls_close(AVFormatContext *s)
free_playlist_list(c);
free_variant_list(c);
free_rendition_list(c);
-
+ if (c->abr) {
+ av_free(c->throughputs);
+ av_free(c->switch_tasks);
+ av_free(c->switch_info);
+ }
av_dict_free(&c->avio_opts);
ff_format_io_close(c->ctx, &c->playlist_pb);
@@ -1852,6 +2096,19 @@ static int hls_read_header(AVFormatContext *s)
c->first_packet = 1;
c->first_timestamp = AV_NOPTS_VALUE;
c->cur_timestamp = AV_NOPTS_VALUE;
+ c->cur_var = -1;
+ c->switch_request = -1;
+ c->switch_step = 1;
+ c->can_switch = -1;
+
+ if (c->abr) {
+ c->http_persistent = 0;
+ c->throughputs = av_mallocz(sizeof(struct throughput));
+ if (!c->throughputs) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ }
if ((ret = save_avio_options(s)) < 0)
goto fail;
@@ -2042,6 +2299,37 @@ static int hls_read_header(AVFormatContext *s)
add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
}
+ if (c->abr) {
+ c->switch_tasks = av_malloc(c->n_playlists * sizeof(struct switch_task));
+ if (!c->switch_tasks) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ c->switch_info = av_malloc((SWITCH_TYPES - 1) * sizeof(struct switch_info));
+ if (!c->switch_info) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ for (i = 0; i < SWITCH_TYPES - 1; i++) {
+ c->switch_info[i].pls_index = -1;
+ c->switch_info[i].first_timestamp = AV_NOPTS_VALUE;
+ c->switch_info[i].delta_timestamp = AV_NOPTS_VALUE;
+ }
+ for (i = 0; i < c->n_playlists; i++) {
+ struct playlist *pls = c->playlists[i];
+ int type;
+
+ c->switch_tasks[i].switch_timestamp = AV_NOPTS_VALUE;
+ type = playlist_type_simple(pls);
+ if (type == SWITCH_AUDIO) {
+ if (c->switch_info[SWITCH_AUDIO].pls_index == -1)
+ c->switch_info[SWITCH_AUDIO].pls_index = pls->index;
+ } else {
+ if (c->switch_info[SWITCH_VIDEO].pls_index == -1)
+ c->switch_info[SWITCH_VIDEO].pls_index = pls->index;
+ }
+ }
+ }
update_noheader_flag(s);
return 0;
@@ -2050,12 +2338,71 @@ fail:
return ret;
}
+static void change_discard_flags(struct playlist *pls, enum SwitchType type, int flag)
+{
+ int process_all = 0;
+ if (type == SWITCH_VIDEO_AUDIO)
+ process_all = 1;
+ for (int j = 0; j < pls->n_main_streams; j++) {
+ if (process_all || pls->main_streams[j]->codecpar->codec_type == (enum AVMediaType)type)
+ pls->main_streams[j]->discard = flag;
+ }
+}
+
+static int find_current_variant(HLSContext *c)
+{
+ int i, j, needed;
+ for (i = 0; i < c->n_variants; i++) {
+ needed = 1;
+ for (j = 0; j < c->variants[i]->n_playlists; j++) {
+ struct playlist *pls = c->variants[i]->playlists[j];
+ if (!playlist_needed(pls)) {
+ needed = 0;
+ }
+ }
+ if (needed)
+ return i;
+ }
+ return -1;
+}
+
static int recheck_discard_flags(AVFormatContext *s, int first)
{
HLSContext *c = s->priv_data;
int i, changed = 0;
int cur_needed;
+ if (c->abr && c->switch_request != -1) {
+ struct variant *var = c->variants[c->switch_request];
+ int no_switch_task = 1;
+ for (int i = 0; i < var->n_playlists; i++) {
+ struct playlist *pls = var->playlists[i];
+ if (c->switch_tasks[pls->index].switch_timestamp != AV_NOPTS_VALUE
+ && c->cur_timestamp >= c->switch_tasks[pls->index].switch_timestamp) {
+ av_log(s, AV_LOG_INFO, "[switch point] cur_timestamp:%ld\n", c->cur_timestamp);
+ change_discard_flags(pls, c->switch_tasks[pls->index].type, AVDISCARD_DEFAULT);
+ c->switch_tasks[pls->index].switch_timestamp = AV_NOPTS_VALUE;
+
+ for (int j = 0; j < c->n_playlists; j++) {
+ struct playlist *cpls = c->playlists[j];
+ if (cpls == pls)
+ continue;
+ change_discard_flags(cpls, c->switch_tasks[pls->index].type, AVDISCARD_ALL);
+ }
+ }
+ }
+
+ for (int k = 0; k < c->n_playlists; ++k) {
+ if (c->switch_tasks[k].switch_timestamp != AV_NOPTS_VALUE) {
+ no_switch_task = 0;
+ }
+ }
+ if (no_switch_task) {
+ c->can_switch = 1;
+ c->cur_var = c->switch_request;
+ }
+ }
+
/* Check if any new streams are needed */
for (i = 0; i < c->n_playlists; i++) {
struct playlist *pls = c->playlists[i];
@@ -2070,6 +2417,11 @@ static int recheck_discard_flags(AVFormatContext *s, int first)
changed = 1;
pls->cur_seq_no = select_cur_seq_no(c, pls);
pls->pb.eof_reached = 0;
+ if (c->abr) {
+ pls->cur_seq_no++;
+ avio_flush(&pls->pb);
+ avformat_flush(pls->ctx);
+ }
if (c->cur_timestamp != AV_NOPTS_VALUE) {
/* catch up */
pls->seek_timestamp = c->cur_timestamp;
@@ -2077,7 +2429,7 @@ static int recheck_discard_flags(AVFormatContext *s, int first)
pls->seek_stream_index = -1;
}
av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
- } else if (first && !cur_needed && pls->needed) {
+ } else if ((first || c->abr) && !cur_needed && pls->needed) {
ff_format_io_close(pls->parent, &pls->input);
pls->input_read_done = 0;
ff_format_io_close(pls->parent, &pls->input_next);
@@ -2087,6 +2439,13 @@ static int recheck_discard_flags(AVFormatContext *s, int first)
av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
}
}
+
+ if (c->abr && changed && c->cur_var == -1) {
+ c->cur_var = find_current_variant(c);
+ av_log(s, AV_LOG_INFO, "Find current variant %d\n", c->cur_var);
+ if (c->cur_var != -1 && c->can_switch == -1)
+ c->can_switch = 1;
+ }
return changed;
}
@@ -2159,7 +2518,39 @@ static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
/* audio elementary streams are id3 timestamped */
fill_timing_for_id3_timestamped_stream(pls);
}
+ if (c->abr && !c->switch_inited && pls->pkt.dts != AV_NOPTS_VALUE) {
+ for (int j = 0; j < SWITCH_TYPES - 1; j++) {
+ if (c->switch_info[j].first_timestamp != AV_NOPTS_VALUE
+ && c->switch_info[j].delta_timestamp == AV_NOPTS_VALUE
+ && c->switch_info[j].pls_index == pls->index) {
+ c->switch_info[j].delta_timestamp =
+ av_rescale_q(pls->pkt.dts, get_timebase(pls), AV_TIME_BASE_Q)
+ - c->switch_info[j].first_timestamp;
+ av_log(s, AV_LOG_VERBOSE, "[abr_delta] pls%d dts=%ld\n", pls->index, pls->pkt.dts);
+ }
+ if (c->switch_info[j].first_timestamp == AV_NOPTS_VALUE
+ && c->switch_info[j].pls_index == pls->index) {
+ c->switch_info[j].first_timestamp = av_rescale_q(pls->pkt.dts,
+ get_timebase(pls), AV_TIME_BASE_Q);
+ av_log(s, AV_LOG_VERBOSE, "[abr_first] pls%d dts=%ld\n", pls->index, pls->pkt.dts);
+ }
+ }
+ if ((c->switch_info[SWITCH_AUDIO].pls_index == -1 ||
+ c->switch_info[SWITCH_AUDIO].delta_timestamp != AV_NOPTS_VALUE)
+ && (c->switch_info[SWITCH_VIDEO].pls_index == -1 ||
+ c->switch_info[SWITCH_VIDEO].delta_timestamp != AV_NOPTS_VALUE)) {
+ c->switch_inited = 1;
+ if (c->switch_info[SWITCH_VIDEO].pls_index != -1)
+ av_log(s, AV_LOG_VERBOSE, "[abr_init] video:first=%ld, delta=%ld\n",
+ c->switch_info[SWITCH_VIDEO].first_timestamp,
+ c->switch_info[SWITCH_VIDEO].delta_timestamp);
+ if (c->switch_info[SWITCH_AUDIO].pls_index != -1)
+ av_log(s, AV_LOG_VERBOSE, "[abr_init] audio:first=%ld, delta=%ld\n",
+ c->switch_info[SWITCH_AUDIO].first_timestamp,
+ c->switch_info[SWITCH_AUDIO].delta_timestamp);
+ }
+ }
if (c->first_timestamp == AV_NOPTS_VALUE &&
pls->pkt.dts != AV_NOPTS_VALUE)
c->first_timestamp = av_rescale_q(pls->pkt.dts,
@@ -2367,6 +2758,8 @@ static int hls_probe(const AVProbeData *p)
#define OFFSET(x) offsetof(HLSContext, x)
#define FLAGS AV_OPT_FLAG_DECODING_PARAM
static const AVOption hls_options[] = {
+ {"abr", "enable abr to switch streams",
+ OFFSET(abr), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
{"live_start_index", "segment index to start live streams at (negative values are from the end)",
OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
{"allowed_extensions", "List of file extensions that hls is allowed to access",