[FFmpeg-devel] [PATCH 1/2] avformat/dashenc: Added option to repeatedly publish master playlist

[Jeyapal, Karthick]

On 2/19/19 12:18 PM, Karthick J wrote:
> The master playlist can be published at a specified interval with this option
> ---
>  doc/muxers.texi       | 3 +++
>  libavformat/dashenc.c | 9 ++++++++-
>  2 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/doc/muxers.texi b/doc/muxers.texi
> index 36010cf2d1..372fab2f92 100644
> --- a/doc/muxers.texi
> +++ b/doc/muxers.texi
> @@ -315,6 +315,9 @@ This option will also try to comply with the above open spec, till Apple's spec
>  Applicable only when @var{streaming} and @var{hls_playlist} options are enabled.
>  This is an experimental feature.
>  
> + at item -master_m3u8_publish_rate @var{master_m3u8_publish_rate}
> +Publish master playlist repeatedly every after specified number of segment intervals.
> +
>  @end table
>  
>  @anchor{framecrc}
> diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
> index 37a7547b12..a0b44a0ec3 100644
> --- a/libavformat/dashenc.c
> +++ b/libavformat/dashenc.c
> @@ -141,6 +141,7 @@ typedef struct DASHContext {
>      SegmentType segment_type_option;  /* segment type as specified in options */
>      int ignore_io_errors;
>      int lhls;
> +    int master_publish_rate;
>  } DASHContext;
>  
>  static struct codec_string {
> @@ -965,13 +966,18 @@ static int write_manifest(AVFormatContext *s, int final)
>              return ret;
>      }
>  
> -    if (c->hls_playlist && !c->master_playlist_created) {
> +    if (c->hls_playlist) {
>          char filename_hls[1024];
>          const char *audio_group = "A1";
>          char audio_codec_str[128] = "\0";
>          int is_default = 1;
>          int max_audio_bitrate = 0;
>  
> +        // Publish master playlist only the configured rate
> +        if (c->master_playlist_created && (!c->master_publish_rate ||
> +             c->streams[0].segment_index % c->master_publish_rate))
> +            return 0;
> +
>          if (*c->dirname)
>              snprintf(filename_hls, sizeof(filename_hls), "%smaster.m3u8", c->dirname);
>          else
> @@ -1798,6 +1804,7 @@ static const AVOption options[] = {
>      { "webm", "make segment file in WebM format", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_TYPE_WEBM }, 0, UINT_MAX,   E, "segment_type"},
>      { "ignore_io_errors", "Ignore IO errors during open and write. Useful for long-duration runs with network output", OFFSET(ignore_io_errors), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
>      { "lhls", "Enable Low-latency HLS(Experimental). Adds #EXT-X-PREFETCH tag with current segment's URI", OFFSET(lhls), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
> +    { "master_m3u8_publish_rate", "Publish master playlist every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
>      { NULL },
>  };
Pushed Patchset.
>