> 在 2020年8月23日，20:23，Hongcheng Zhong <sj.hc_zh...@sjtu.edu.cn> 写道：
>
> From: spartazhc <sparta...@gmail.com>
>
> Add an AVDictionary option "abr_initial", which could be used to send
> message to ffplay. Currently, the first entry "abr_init_duration" is
> added.
>
> Signed-off-by: spartazhc <sparta...@gmail.com>
> ---
> doc/demuxers.texi | 3 +++
> libavformat/hls.c | 14 ++++++++++++++
> 2 files changed, 17 insertions(+)
>
> diff --git a/doc/demuxers.texi b/doc/demuxers.texi
> index 4cdbd95962..761a372b86 100644
> --- a/doc/demuxers.texi
> +++ b/doc/demuxers.texi
> @@ -324,6 +324,9 @@ It accepts the following options:
> @item abr
> enable abr to switch streams.
>
> +@item abr_initial
> +metadata used by abr for ffplay.
> +
> @item live_start_index
> segment index to start live streams at (negative values are from the end).
>
> diff --git a/libavformat/hls.c b/libavformat/hls.c
> index 37a5a017b1..5c251cd002 100644
> --- a/libavformat/hls.c
> +++ b/libavformat/hls.c
> @@ -243,6 +243,7 @@ typedef struct HLSContext {
> AVIOContext *playlist_pb;
>
> int abr;
> + AVDictionary *abr_initial;
> struct throughput *throughputs;
> struct switch_task *switch_tasks;
> struct switch_info *switch_info;
> @@ -2308,6 +2309,7 @@ static int hls_read_header(AVFormatContext *s)
> }
>
> if (c->abr) {
> + int64_t abr_init_duration = AV_NOPTS_VALUE;
> c->switch_tasks = av_malloc(c->n_playlists * sizeof(struct
> switch_task));
> if (!c->switch_tasks) {
> ret = AVERROR(ENOMEM);
> @@ -2326,6 +2328,15 @@ static int hls_read_header(AVFormatContext *s)
> for (i = 0; i < c->n_playlists; i++) {
> struct playlist *pls = c->playlists[i];
> int type;
> + int64_t start = 0;
> + for (int i = 0; i < c->cur_seq_no + 1; i++) {
> + start += pls->segments[i]->duration;
> + }
> + start = av_rescale_q(start,
> + AV_TIME_BASE_Q,
> + get_timebase(pls));
> + if (abr_init_duration == AV_NOPTS_VALUE || abr_init_duration >
> start)
> + abr_init_duration = start;
>
> c->switch_tasks[i].switch_timestamp = AV_NOPTS_VALUE;
> type = playlist_type_simple(pls);
> @@ -2337,6 +2348,7 @@ static int hls_read_header(AVFormatContext *s)
> c->switch_info[SWITCH_VIDEO].pls_index = pls->index;
> }
> }
> + av_dict_set_int(&c->abr_initial, "abr_init_duration",
> abr_init_duration, 0);
> }
> update_noheader_flag(s);
>
> @@ -2768,6 +2780,8 @@ static int hls_probe(const AVProbeData *p)
> static const AVOption hls_options[] = {
> {"abr", "enable abr to switch streams",
> OFFSET(abr), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
> + {"abr_initial", "metadata used by abr for ffplay",
> + OFFSET(abr_initial), AV_OPT_TYPE_DICT, { 0 }, 0, 0, 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",
> --
> 2.28.0
>
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should be ok.
Thanks
Steven
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